Coated polyethylene anti-dust high-thermal-insulation long-acting flow-droplet-eliminating fog-preventing shed film and preparation method thereof

Abstract

The present application belongs to the technical field of agricultural film preparation, and particularly relates to a coated polyethylene anti-pesticide dustproof high-heat-preservation long-acting flow-dripping mist-eliminating shed film and a preparation method thereof. The shed film adds dustproof masterbatch and acid-resistant aging-resistant masterbatch in the inner layer, respectively, and the inner layer faces the outside of the shed after the shed is buckled, thereby playing the functions of self-cleaning dustproof and anti-pesticide aging resistance. The water slurry stone heat preservation masterbatch and the acid-resistant aging-resistant masterbatch are added in the secondary inner layer, thereby playing the heat preservation function. The water slurry stone heat preservation masterbatch and the acid-resistant aging-resistant masterbatch are added in the middle layer, thereby mainly playing the function of enhancing the high heat preservation and anti-pesticide aging resistance. The acid-resistant aging-resistant masterbatch and the heat preservation masterbatch are added in the secondary outer layer, thereby mainly playing the functions of enhancing the anti-pesticide aging resistance and heat preservation resistance. The acid-resistant aging-resistant masterbatch is added in the outer layer, thereby playing the functions of enhancing the anti-pesticide resistance and anti-photothermal oxidative degradation. The coating layer is a long-acting flow-dripping mist-eliminating layer, mainly playing the functions of long-acting elimination of the mist in the shed and improvement of the light transmittance, thereby being beneficial to the photosynthesis of crops.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of agricultural film preparation, and particularly relates to a coated polyethylene anti-pesticide dustproof high-heat-preservation long-acting flow-dripping anti-mist shed film and a preparation method thereof. BACKGROUND

[0002] Agriculture is the foundation of the national economy, and greenhouse film is an important material for agricultural facilities and horticulture. China's annual consumption of polyethylene agricultural greenhouse film is around 1.05 million tons, ranking among the world's top. The market for high-end multifunctional agricultural greenhouse film is growing at a rate of two digits per year. Due to the high multiple cropping index of plastic greenhouse, the use of fertilizers and pesticides is increasing rapidly. According to the use of pesticides, China's pesticide use increased by 3.5 times from 2021 to 2023. The sulfur and chlorine components in pesticides can form sulfurous acid (H2SO3) and hydrochloric acid (HCl) with water molecules in the greenhouse, and react with the strong alkaline hindered amine light stabilizer 944 (N-H type alkaline), 783, etc. to neutralize the acid and base, thus passivating the activity of the hindered amine light stabilizer in the greenhouse film, making it unable to capture the oxidative free radicals that promote polymer chain scission, and accelerating the disintegration and damage of the greenhouse film. Pesticides containing sulfur and chlorine have a significant impact on the weatherability and service life of greenhouse film, especially in recent years with abnormal heat, the duration of high temperature in summer is getting longer, up to 40℃ for 40-70 days in some areas, and the aging rate of greenhouse film usually doubles for every 10℃ increase in temperature. In 2017, a large-scale PE greenhouse film for watermelons in Zhejiang and Shanghai Chongming Island exploded prematurely, with a design life of 1 year but a service life of less than 7 months. From 2019 to 2021, in Xichang, Sichuan, and Kunming, Yunnan, grape film damage occurred due to frequent use of stone sulfur mixture to prevent powdery mildew, with a service life of 13-17 months, less than the design life of 2 years. Since 2021, in Yunnan, Fujian, and other places, due to the frequent use of sulfur-containing pesticides for growing roses, hydrangeas, and other flowers, quality accidents of premature greenhouse explosion have occurred. From 2022 to 2023, in Shanxi and Shandong, winter jujube, strawberry, and some melon and fruit vegetables were also frequently damaged in greenhouses, with a service life of 10-12 months for a design life of 2 years. Through the detection and analysis of damaged greenhouse film residues, the cause of the above greenhouse explosions was found to be excessive sulfur or chlorine content in the residues. The test results showed that the sulfur content in one-year-old greenhouse film was 1000-1300 PPM, in two-year-old greenhouse film was 2100-2500 PPM, and in three-year-old greenhouse film was 3000-3500 PPM, and the chlorine content was 150-350 PPM. Through analysis of a large number of pesticide residue data, the order of the impact on greenhouse film is grape > melon and fruit > flower. For greenhouse film, the service life and effectiveness are important indicators for evaluating the quality and performance of greenhouse film products.The greenhouse film covering planting must meet the development trend of agricultural production, in order to overcome the technical difficulties of the above-mentioned shed breaking problems, it is urgent to develop a shed film with the functions of acid-resistant pesticide (sulfur and chlorine resistance), long service life, dust prevention, high heat preservation, long-acting flow and drop fog elimination, especially the long-life shed film with more than five years of service life and resistance to pesticides for export to North Africa and Southern Europe, which requires more stringent resistance to sulfur S>5000PPM and resistance to chlorine Cl>450PPM. In order to adapt to the international market, it is necessary to innovate high-quality shed film with higher applicability. The research and invention of high-end comprehensive functional shed film realize the functions of pesticide-resistant super-long service life, self-cleaning dust prevention, high heat preservation, long-acting flow and drop fog elimination, which is the research topic of the present invention. SUMMARY

[0003] The purpose of the present application is to provide a coated polyethylene shed film with pesticide resistance and dust prevention and high heat preservation. The shed film has the functions of pesticide resistance, dust prevention, high heat preservation, long-acting flow and drop fog elimination, and the service life of the film is synchronized. The present application also provides a preparation method.

[0004] The coated polyethylene anti-pesticide dustproof high-thermal-insulation long-acting flow-droplet-eliminating fog-shedding shed film provided by the present application has a thickness ranging from 0.06 mm to 0.25 mm and is composed of an inner layer, a secondary inner layer, a middle layer, a secondary outer layer, an outer layer and a coating layer, and the thickness ratio of the inner layer, the secondary inner layer, the middle layer, the secondary outer layer and the outer layer is 0.75:1.0:1.5:1.0:0.75; the inner layer is a dustproof and aging-resistant layer and is composed of the following raw materials in mass percentage: 70%-85% of metallocene linear low-density polyethylene (mLLDPE), 0-10% of low-density polyethylene (LDPE), 7%-10% of acid-resistant aging-resistant masterbatch and 7%-10% of dustproof masterbatch; the secondary inner layer is a thermal-insulation acid-resistant aging-resistant layer and is composed of the following raw materials in mass percentage: 40% of metallocene linear low-density polyethylene (mLLDPE), 16-25% of linear low-density polyethylene (LLDPE), 20-25% of low-density polyethylene (LDPE), 7%-10% of acid-resistant aging-resistant masterbatch and 7%-10% of thermal-insulation barrier masterbatch; the middle layer is an acid-resistant aging-resistant high-thermal-insulation barrier layer and is composed of the following raw materials in mass percentage: 30-40% of metallocene linear low-density polyethylene (mLLDPE), 20-25% of linear low-density polyethylene (LLDPE), 16-30% of low-density polyethylene (LDPE), 7%-10% of acid-resistant aging-resistant masterbatch and 9%-12% of thermal-insulation barrier masterbatch; the secondary outer layer is an acid-resistant thermal-insulation layer and is composed of the following raw materials in mass percentage: 30-40% of metallocene linear low-density polyethylene (mLLDPE), 20-30% of linear low-density polyethylene (LLDPE), 15-30% of low-density polyethylene (LDPE), 7%-10% of acid-resistant aging-resistant masterbatch and 6%-8% of thermal-insulation barrier masterbatch; the outer layer is an acid-resistant aging-resistant layer and is composed of the following raw materials in mass percentage: 80%-92% of metallocene linear low-density polyethylene (mLLDPE), 0-10% of low-density polyethylene (LDPE) and 8%-10% of acid-resistant aging-resistant masterbatch; and the coating layer is a long-acting flow-droplet-eliminating fog-shedding layer.

[0005] Wherein:

[0006] The acid-resistant aging-resistant masterbatch in the inner layer, the secondary inner layer, the middle layer, the secondary outer layer and the outer layer has the same raw material composition and is composed of the following raw materials in mass percentage: 33%-43% of low-density polyethylene (LDPE), 40%-43% of linear low-density polyethylene (LLDPE), 12%-24% of acid-resistant light stabilizer and 2%-3% of antioxidant; wherein the acid-resistant light stabilizer is a hindered amine-based nitroxyl type (NOR) or a combination of nitroxyl and nitryl types (NOR+NR).

[0007] Preferably, the inner layer, the secondary inner layer, the middle layer, the secondary outer layer and the outer layer are composed of the same anti-acid aging masterbatch raw material, and the anti-acid aging masterbatch is composed of the following raw materials in percentage by mass: low-density polyethylene (LDPE) 37%, linear low-density polyethylene (LLDPE) 40%, anti-acid light stabilizer 20%, and antioxidant 3%.

[0008] The anti-acid light stabilizer is at least one of NOR356, NOR371, 2011MB, XT200 or XT-8, NOR356, NOR371, 2011MB and XT200 are produced by BASF Company, and XT-8 is produced by Beijing Tian Gong Company.

[0009] The light stabilizers HALS NOR356, NOR371 and XT-8 are N-OR group HALS with piperidine ring, which changes the molecular structure of the light stabilizer. The reactivity of the light stabilizer with the active group of the pesticide is reduced due to the introduction of the alkoxyl group-OR, which fundamentally reduces the passivation reaction of the light stabilizer. At the same time, their structure can directly enter the stable loop of the hindered amine to protect the greenhouse film to achieve the best service life in the environment with high pesticide residues; the N-OR group type can resist sulfur 3000-7000PPM and chlorine ≤850PPM; the compound type (NOR+NR) 2011MB and XT200 can resist sulfur >3000PPM and chlorine >250PPM.

[0010] The low-density polyethylene (LDPE) in the anti-acid aging masterbatch has a melt index (MI) of 2.0g / 10min, and is preferably any one of 2102TN00 produced by Qilu Petrochemical or 2426H produced by Daqing Petrochemical; the linear low-density polyethylene (LLDPE) has a melt index (MI) of 2.0g / 10min and is in the form of powder, and is preferably any one of 7042 produced by Qilu Petrochemical or 1820 produced by Tianjin Lianhua; the antioxidant is a composite of hindered phenol and phosphite, and the preferred antioxidant is any one of B215 or B225; both B215 and B225 are produced by Beijing Jiyi Company.

[0011] The preparation method of the anti-acid aging masterbatch is as follows: low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), anti-acid light stabilizer and antioxidant are added to a kneader in proportion, plasticized, then fed into a single-screw extruder through an open mill, hot cut, air-cooled and dried to obtain the aging masterbatch; wherein the temperature of the kneader is 125-140℃, the plasticizing time is 15-20 minutes, and the temperature of the open mill and the single-screw extruder is 145℃-175℃.

[0012] The specific parameters of the raw materials used in the inner layer, the secondary inner layer, the middle layer, the secondary outer layer and the outer layer are as follows:

[0013] The density of the metallocene linear low density polyethylene (m-LLDPE) is 0.911-0.920 g / cm 3 , and the melt index (MI) is 0.2-1.0 g / 10 min; preferably, the metallocene linear low density polyethylene is any one or more than two of the following: 2010MA, 1018MA, XP7052, XP7021, XP6056 ML, XP6026 ML produced by Exxon Mobil Corporation, or D139 produced by Phillips Chevron Company.

[0014] The density of the linear low density polyethylene (LLDPE) is 0.918-0.922 g / cm 3 , and the melt index (MI) is 0.8-1.0 g / 10 min; preferably, the linear low density polyethylene (LLDPE) is any one of the following: 1001 AV produced by Exxon Mobil Corporation, 9085 produced by Tianjin Lian Carbon, or 0209AA produced by Shanghai Saikuo.

[0015] The density of the low density polyethylene (LDPE) is 0.920-0.923 g / cm 3 , and the melt index (MI) is 0.2-1.0 g / 10 min; preferably, the low density polyethylene (LDPE) is any one or more than two of the following: 2420D, 2420F, and 2426F produced by Daqing Petrochemical or imported from Iran.

[0016] The dust-proof master batch in the inner layer is a commercially available product, EFT997 or EFT998 produced by Tianjin Lixian Company; or a maleic anhydride grafted type dust-proof master batch, produced by Jilin Baineng Plastic Technology Company, with the trade name BE-10F.

[0017] The barrier and heat preservation master batch in the secondary inner layer, the middle layer and the secondary outer layer has the same composition, which is composed of the following raw materials in mass percentage: ethylene-vinyl acetate copolymer resin (EVA) 20%-25%, linear low density polyethylene (LLDPE) 15%-23%, water-sliding stone heat preservation agent 50%-60%, coupling agent 1.0%-3.0%, lubricant 0.5%-1.5%, and dispersant 0.5%-1.5%.

[0018] The melt index (MI) of ethylene-vinyl acetate copolymer resin (EVA) in the barrier heat preservation masterbatch is 2.0-3.0 g / 10 min, preferably any one of the 14-2 brand produced by Beijing Organic Chemical Industry or the 18J3 brand produced by Yanshan Petrochemical; the melt index (MI) of linear low-density polyethylene (LLDPE) is 2.0 g / 10 min, the appearance is powder, preferably any one of the 7042 brand produced by Qilu Petrochemical or the 1820 brand produced by Tianlian Chemical; the hydrotalcite heat preservation agent is preferably any one of the HTP brand produced by Kasai Chemical Co., Ltd. in Japan or the HT3 brand produced by Dandong Xiehe Company; the coupling agent is any one of a titanate or an aluminate, both of which are produced by Linyi Feiteng Chemical Industry Co., Ltd.; the lubricant is any one or two of zinc stearate or calcium stearate produced by Qingdao Jisihua; and the dispersing agent is polyethylene wax produced by Qingdao Jisihua.

[0019] The preparation method of the barrier heat preservation masterbatch comprises the following steps: ethylene-vinyl acetate copolymer resin (EVA), linear low-density polyethylene (LLDPE), hydrotalcite heat preservation agent, coupling agent, lubricant and dispersing agent are added into a banbury mixer in proportion for kneading and plasticizing, then fed into a single-screw extruder through an open mill, and finally the barrier heat preservation masterbatch is prepared through hot cutting, air cooling and drying.

[0020] The temperature of the banbury mixer is 125-140 DEG C, the plasticizing time is 17-20 minutes, and the temperature of the open mill and the single-screw extruder is 145-175 DEG C.

[0021] The coating layer is composed of the following raw materials in mass percentage: 8% of the new scratch-resistant coating liquid stock solution and 92% of deionized water; the new scratch-resistant coating liquid stock solution is any one of TG-188 or TF-820C; the manufacturer of TG-188 is Japan Chubun Oil and Fat Co., Ltd., and the manufacturer of TF-820C is Lin'an Lv Yuan Company.

[0022] The coating layer is dry matter of a coating liquid made of inorganic aluminum sol, silica sol, environment-friendly surfactant and organic mixed glue, and the dry matter content of the coating liquid of the coating layer after drying is greater than or equal to 0.18 g / m 2 .

[0023] The principle of selecting the coating liquid is that the initial effect of anti-fogging and anti-dripping is very fast, the film presents a mirror state, the low-temperature anti-dripping effect is good, the excellent anti-fogging and anti-dripping effect is maintained for a long time, the anti-fogging and anti-dripping effect will not become poor due to the friction in the process of buckling and using, the harmful substances are not contained according to the green environmental protection regulation, and good processing stability is obtained.

[0024] The coated polyethylene anti-pesticide dustproof high-heat-preservation long-acting flow-dropping fog-eliminating shed film provided by the application has the functions of self-cleaning dustproof, resistance to photo-thermal oxidative degradation and improvement of anti-pesticide and anti-aging by adding dustproof masterbatch and acid-resistant and anti-aging masterbatch in the inner layer; the functions of heat preservation by blocking infrared radiation to the outside of the shed at night and on cloudy days and anti-pesticide and anti-aging by adding hydrotalcite heat preservation masterbatch and acid-resistant and anti-aging masterbatch in the second inner layer; the functions of blocking far infrared radiation to the outside of the shed at night, reducing the thermal conductivity of the shed film to achieve the effect of heat preservation at night, resistance to photo-thermal oxidative degradation and enhancement of anti-pesticide and anti-aging by adding hydrotalcite heat preservation masterbatch and acid-resistant and anti-aging masterbatch in the middle layer; the functions of enhancement of anti-pesticide and anti-aging and heat preservation by blocking infrared radiation to the outside of the shed at night and on cloudy days by adding acid-resistant and anti-aging masterbatch and heat preservation masterbatch in the second outer layer; and the functions of enhancement of anti-pesticide and resistance to photo-thermal oxidative degradation by adding acid-resistant and anti-aging masterbatch in the outer layer, and adhesion with the coating layer. The coating layer is a long-acting flow-dropping fog-eliminating layer, which mainly functions to long-acting eliminate the fog in the shed to improve the light transmittance, which is beneficial to the photosynthesis of crops and reduces the diseases and pests of crops.

[0025] The preparation method of the coated polyethylene anti-pesticide dustproof high-heat-preservation long-acting flow-dropping fog-eliminating shed film comprises the following steps: uniformly mixing and stirring each component material of the inner layer, the second inner layer, the middle layer, the second outer layer and the outer layer, adding them into a five-layer co-extruder, melt plasticizing blow molding, cooling and shaping, traction, corona, coating liquid immersion, drying, edge welding, cutting, code marking, folding and then obtaining the coated polyethylene anti-pesticide dustproof high-heat-preservation long-acting flow-dropping fog-eliminating shed film.

[0026] In the five-layer co-extruder, the temperatures of the inner layer, the second inner layer, the middle layer, the second outer layer and the outer layer are 170-210 DEG C, the die temperature is 190-215 DEG C, the oven temperature is 65-95 DEG C, and the blow ratio is 1.5-2.5.

[0027] The coated polyethylene anti-pesticide dustproof high-heat-preservation long-acting flow-dropping fog-eliminating shed film is suitable for preparing covering materials for agricultural and horticultural facilities.

[0028] The application is different from the coated light-conversion dust-proof high-thermal-insulation long-acting flow-dropping mist-eliminating shed film and its preparation method disclosed in patent CN202211350102.7 in that the production processes of the two applications are both five-layer co-extrusion methods, and the difference lies in the extrusion layer thickness ratio. The extrusion layer thickness ratio in CN202211350102.7 is (1:1:1:1:1), and the requirement is that the light-conversion dust-proof thermal-insulation aging-resistant functions are balanced. The extrusion layer thickness ratio of the present application is (0.75:1.0:1.5:1.0:0.75), and the present application emphasizes the design of the anti-pesticide, high-thermal-insulation dust-proof functions. The acid-resistant aging-resistant masterbatch solution is used in the inner layer, the secondary inner layer, the middle layer, the secondary outer layer and the outer layer in production, so that the anti-pesticide performance of the present application embodiment 1 reaches anti-sulfur element S≥6500PPM and anti-chlorine element Cl≥600PPM, which is 13 times higher than the anti-sulfur performance of the present application comparative example 1 (the light stabilizer used is 944, which is equivalent to the embodiment 1 in CN202211350102.7), and the anti-chlorine performance is 6 times higher. The design of the shed film layer thickness ratio of the present application improves the processing performance, especially the processing stability of the shed film with a blow ratio greater than 2.1 and a thickness greater than 0.16mm, which can improve the qualified rate by 3-5% and reduce the processing cost.

[0029] Compared with the prior art, the present application has the following beneficial effects:

[0030] (1) The coated polyethylene anti-pesticide dust-proof high-thermal-insulation long-acting flow-dropping mist-eliminating shed film has a film specification width of more than 8m and a thickness of 0.06-0.25mm. Because the service life of the film is directly related to the thickness, formula design, resin and additive brand, ultraviolet intensity and light radiation intensity in different regions, pesticide use frequency of planting management and shed temperature and humidity. After analyzing the pesticide residue data of the exploded shed residual film in a large number of cases, the grape > melon > flower, and the design scheme of the anti-pesticide shed film suitable for the market demand at home and abroad is made on this basis;

[0031] Among them:

[0032] The recommended thickness of the film is 0.20mm-0.25mm, the designed service life is greater than or equal to 8 years, the resistance to sulfur S is greater than or equal to 6500PPM, and the resistance to chlorine Cl is greater than or equal to 600PPM; the thickness is 0.18mm-0.19mm, the designed service life is greater than or equal to 7 years, the resistance to sulfur S is greater than or equal to 6000PPM, and the resistance to chlorine Cl is greater than or equal to 550PPM; the thickness is 0.16mm-0.17mm, the designed service life is greater than or equal to 6 years, the resistance to sulfur S is greater than or equal to 5500PPM, and the resistance to chlorine Cl is greater than or equal to 500PPM; the thickness is 0.13mm-0.15mm, the designed service life is greater than or equal to 5 years, the resistance to sulfur S is greater than or equal to 5000PPM, and the resistance to chlorine Cl is greater than or equal to 450PPM; the thickness is 0.11mm-0.12mm, the designed service life is greater than or equal to 3 years, the resistance to sulfur S is greater than or equal to 3500PPM, and the resistance to chlorine Cl is greater than or equal to 300PPM; the thickness is 0.08mm-0.10mm, the designed service life is greater than or equal to 2 years, the resistance to sulfur S is greater than or equal to 3000PPM, and the resistance to chlorine Cl is greater than or equal to 250PPM; the thickness is 0.06mm-0.07mm, the designed service life is greater than or equal to 1 year, the resistance to sulfur S is greater than or equal to 1500PPM, and the resistance to chlorine Cl is greater than or equal to 150PPM;

[0033] The prior art stipulates that the resistance to sulfur S of the shed film with a designed service life of 1 year is less than or equal to 500PPM, and the resistance to chlorine Cl is less than or equal to 100PPM according to the agricultural film industry group standard (T / CPPIA 12-2021 Determination of Influence of Sulfur and Chlorine Containing Pesticides on Weather Resistance of Agricultural Shed Film); the resistance to sulfur S of the shed film with a service life of 2 years is less than or equal to 1000PPM, and the resistance to chlorine Cl is less than or equal to 150PPM; the resistance to sulfur S of the shed film with a service life greater than 2 years is less than or equal to 2000PPM, and the resistance to chlorine Cl is less than or equal to 180PPM; the technical indexes stipulated in the existing standard cannot meet the market demand.

[0034] (2) The coated polyethylene anti-pesticide dustproof high-thermal-insulation long-acting flow-droplet-eliminating fog-eliminating shed film has a light transmittance of greater than or equal to 91%; the infrared transmittance of Example 1 is less than 22%, which significantly improves the thermal insulation performance of the shed at night; the dustproof function makes the annual attenuation rate of the light transmittance less than 1.0%; the flow-droplet-eliminating fog-eliminating function is synchronized with the service life of the shed film, and the shed film can completely meet the needs of farmers in the case of frequent use of pesticides for different crops, thereby preventing shed accidents, saving shed costs, and being more low-carbon and environmentally friendly.

[0035] (3) The preparation method of the coated polyethylene anti-pesticide dustproof high-thermal-insulation long-acting flow-droplet-eliminating fog-eliminating shed film has a scientific and reasonable layered layout function, avoids the negative synergistic effect of various functional master batches and coating liquids, scientifically designs the extrusion layer thickness ratio according to the functional requirements, and ensures stable and reliable performance and quality, and is simple and easy to operate. DETAILED DESCRIPTION

[0036] The application will be further described below in combination with examples.

[0037] Example 1

[0038] The coated polyethylene anti-pesticide dust-proof high-thermal-insulation long-acting flow-droplet-eliminating mist-shedding shed film according to the present embodiment 1 comprises an inner layer, a secondary inner layer, a middle layer, a secondary outer layer, an outer layer and a coating layer.

[0039] Wherein:

[0040] The inner layer is a dust-proof and aging-resistant layer, and the inner layer is composed of the following raw materials in mass percentage: metallocene linear low density polyethylene (mLLDPE) 70%, low density polyethylene (LDPE) 10%, acid-resistant aging-resistant masterbatch 10%, and dust-proof masterbatch 10%.

[0041] The secondary inner layer is a thermal-insulation acid-resistant aging-resistant layer, and the secondary inner layer is composed of the following raw materials in mass percentage: metallocene linear low density polyethylene (mLLDPE) 40%, linear low density polyethylene (LLDPE) 20%, low density polyethylene (LDPE) 20%, acid-resistant aging-resistant masterbatch 10%, and thermal-insulation barrier masterbatch 10%.

[0042] The middle layer is a thermal-insulation acid-resistant aging-resistant layer, and the middle layer is composed of the following raw materials in mass percentage: metallocene linear low density polyethylene (mLLDPE) 30%, linear low density polyethylene (LLDPE) 20%, low density polyethylene (LDPE) 28%, acid-resistant aging-resistant masterbatch 10%, and thermal-insulation barrier masterbatch 12%.

[0043] The secondary outer layer is an acid-resistant thermal-insulation layer, and the secondary outer layer is composed of the following raw materials in mass percentage: metallocene linear low density polyethylene (mLLDPE) 30%, linear low density polyethylene (LLDPE) 22%, low density polyethylene (LDPE) 30%, acid-resistant aging-resistant masterbatch 10%, and thermal-insulation barrier masterbatch 8%.

[0044] The outer layer is an acid-resistant aging-resistant layer, and the outer layer is composed of the following raw materials in mass percentage: metallocene linear low density polyethylene (mLLDPE) 80%, low density polyethylene (LDPE) 10%, and acid-resistant aging-resistant masterbatch 10%.

[0045] In the inner layer raw materials: metallocene linear low density polyethylene (m-LLDPE) with a melt index (MI) of 1.0 g / 10 min, model 2010MA, manufactured by Exxon Mobil; low density polyethylene (LDPE) with a melt index (MI) of 0.75 g / 10 min, model 2426F, produced by Daqing Petrochemical; acid-resistant aging-resistant masterbatch 1# (self-made); and dust-proof masterbatch model EFT997, manufactured by Tianjin Liren Company.

[0046] The anti-acid type aging-resistant master batch 1# in the inner layer raw material is composed of the following raw materials in percentage by mass: low density polyethylene (LDPE) 37%, powdered linear low density polyethylene (LLDPE) 40%, light stabilizer 20%, and antioxidant 3%.

[0047] The low density polyethylene (LDPE) is of the brand 2102TN00 and manufactured by Qilu Petrochemical; the powdered low density linear polyethylene (LLDPE) is of the brand 7042 and manufactured by Qilu Petrochemical; the light stabilizer is of the brand NOR356 and manufactured by BASF Company; and the antioxidant is of the brand B225 and manufactured by Beijing Jixi Company.

[0048] The preparation method of the aging-resistant master batch is as follows: the low density polyethylene (LDPE) 2102TN00, the powdered linear low density polyethylene (LLDPE) 7042, the light stabilizer NOR356, and the antioxidant B225 are accurately weighed and added into a kneader for plasticizing, and then are fed into a single-screw extruder through an open mill, and are cut into particles by heat, and are dried by air cooling to obtain the anti-acid type aging-resistant master batch 1#.

[0049] The temperature of the kneader is 138±2℃, the plasticizing time is 19±1 minutes, and the temperature of each section of the open mill and the single-screw granulator is 145℃-175℃ (175℃ in the first section, 165℃ in the second section, and 145℃ in the third section).

[0050] The secondary inner layer is a heat-insulating anti-acid aging-resistant layer. The metallocene linear low density polyethylene (mLLDPE) in the raw material of the secondary inner layer has a melt index (MI) of 0.2g / 10min and is of the brand XP7021 and manufactured by Exxon Mobil; the linear low density polyethylene (LLDPE) has a melt index (MI) of 1.0g / 10min and is of the brand 1001AV and manufactured by Exxon Mobil; the low density polyethylene (LDPE) has a melt index (MI) of 0.25g / 10min and is of the brand 2420D and manufactured by Daqing Petrochemical; the anti-acid aging-resistant master batch 1# is self-made; and the barrier heat-insulating master batch is self-made.

[0051] The barrier heat preservation master batch in the secondary inner layer is composed of the following raw materials in mass percentage: ethylene-vinyl acetate (EVA) 21%, linear low density polyethylene (LLDPE) 15%, hydrotalcite heat preservation agent 60%, coupling agent 2.0%, lubricant 1.0%, dispersant 1.0%; wherein: the melt index (MI) of ethylene-vinyl acetate copolymer resin (EVA) is 2.0 g / 10 min, and the brand is 14-2 produced by Beijing Organic Chemical Industry; the melt index (MI) of linear low density polyethylene (LLDPE) is 2.0 g / 10 min, and the appearance is powder, and the brand is 7042 produced by Qilu Petrochemical; the hydrotalcite heat preservation agent is brand HTP, and is manufactured by Sakai Chemical Company of Japan; the coupling agent is aluminate, and is produced by Linyi Feiteng Chemical Industry Company; the lubricant is zinc stearate and calcium stearate produced by Qingdao Jisihua, and the mixture of the two is compounded in a mass ratio of 1:1; and the dispersant is polyethylene wax produced by Qingdao Jisihua.

[0052] The preparation method of the barrier heat preservation master batch comprises the following steps: ethylene-vinyl acetate (EVA) 14-2, linear low density polyethylene (LLDPE) 7042, hydrotalcite heat preservation agent HTP, aluminate coupling agent, mixed lubricant of zinc stearate and calcium stearate, and polyethylene wax dispersant are accurately metered according to the proportion, added into a banbury mixer for kneading and plasticizing, then fed into a single screw extruder through an open mill, and finally heat cut, air-cooled and dried to obtain the barrier heat preservation master batch for standby.

[0053] The temperature of the banbury mixer is 136±1℃, the plasticizing time is 19±1 minutes, and the temperature of each section is 140-170℃ (170℃ in the first section, 160℃ in the second section, and 140℃ in the third section).

[0054] The middle layer is an acid-resistant and aging-resistant high heat preservation barrier layer, and the raw materials of the middle layer include metallocene linear low density polyethylene (mLLDPE) with a melt index (MI) of 0.2 g / 10 min and a brand XP6026ML manufactured by Exxon Mobil; linear low density polyethylene (LLDPE) with a melt index (MI) of 0.85 g / 10 min and a brand 9085 manufactured by Tianjin Union Carbide; low density polyethylene (LDPE) with a melt index (MI) of 0.25 g / 10 min and a brand 2420D produced by Daqing Petrochemical; acid-resistant and aging-resistant master batch 1# (self-made); and barrier heat preservation master batch (self-made).

[0055] The raw material composition and the preparation method of the acid-resistant and aging-resistant master batch 1# in the middle layer are the same as those of the inner layer in Example 1.

[0056] The raw material composition and the preparation method of the barrier heat preservation master batch in the middle layer are the same as those of the secondary inner layer in Example 1.

[0057] The raw materials in the secondary outer layer include metallocene linear low density polyethylene (m-LLDPE) with a melt index (MI) of 0.5 g / 10 min, produced by Exxon Mobil under the trade name XP7052; linear low density polyethylene (LLDPE) with a melt index (MI) of 0.85 g / 10 min, produced by Tianjin Union Carbide under the trade name 9085; and low density polyethylene (LDPE) with a melt index (MI) of 0.25 g / 10 min, produced by Daqing Petrochemical under the trade name 2420D.

[0058] The raw materials and preparation method of the acid-resistant and aging-resistant master batch 1# in the secondary outer layer are the same as those in the inner layer of Example 1.

[0059] The raw materials and preparation method of the barrier and heat preservation master batch in the secondary outer layer are the same as those in the secondary inner layer of Example 1.

[0060] The raw materials in the outer layer include metallocene linear low density polyethylene (m-LLDPE) with a melt index (MI) of 1.0 g / 10 min, produced by Exxon Mobil under the trade name 2010MA; low density polyethylene with a melt index (MI) of 0.25 g / 10 min, produced by Daqing Petrochemical under the trade name 2420D; and acid-resistant and aging-resistant master batch 1# (self-made).

[0061] The raw materials and preparation method of the acid-resistant and aging-resistant master batch 1# in the outer layer are the same as those in the inner layer of Example 1.

[0062] The coating layer is a long-acting anti-dripping and fog-eliminating layer, which is composed of the following raw materials in mass percentage: coating liquid stock solution 8%, and deionized water 92%.

[0063] The coating layer is a coating liquid dry matter made of inorganic aluminum sol, silica sol, and organic mixed glue solution.

[0064] The coating liquid stock solution in the coating layer is produced by Japan Takimoto Oil & Fat Co., Ltd. under the trade name TG-188.

[0065] The weighed coating liquid stock solution is added to a stainless steel tank, followed by the addition of deionized water, stirring until uniform, standing for 20 minutes, and then pumping into a liquid hanging tank (temperature control at 35℃±2℃) for use. The dry matter content of the coating layer is 0.20 g / m 2 .

[0066] The preparation method of the coated polyethylene anti-pesticide dustproof high-heat-preservation long-acting anti-dripping and fog-eliminating shed film is as follows: the materials in the inner layer, secondary inner layer, middle layer, secondary outer layer, and outer layer are respectively mixed and stirred uniformly, added into a five-layer co-extrusion machine, and then subjected to melt plasticization blowing, cooling and setting, traction, corona, coating liquid immersion, drying, edge welding, slit cutting, code spraying, and folding to obtain the coated polyethylene anti-pesticide dustproof high-heat-preservation long-acting anti-dripping and fog-eliminating shed film.

[0067] The prepared product specification is 12000 / 0.20mm; the layer thickness ratio of the inner layer, the secondary inner layer, the middle layer, the secondary outer layer and the outer layer is 0.75:1.0:1.5:1.0:0.75; the blowing ratio is 1.7; in the five-layer co-extrusion unit, the extruder temperature of the inner layer, the secondary inner layer, the middle layer, the secondary outer layer and the outer layer is 175℃-200℃, and the machine neck, the die head, the die head bottom and the die ring temperature is 200℃-215℃; the oven temperature in each zone is 65℃-95℃.

[0068] Table 1 Process conditions for preparing Example 1

[0069]

[0070] The coated type light-adjustable dust-proof high-thermal-insulation long-acting flow-dripping fog-eliminating shed film prepared in this embodiment 1 has a specification of 12000 / 0.20mm, a designed sulfur resistance S≥6500PPM, a designed chlorine resistance Cl≥600PPM, and an expected service life of more than eight years. It was exported to the Almeria region of Spain for covering planting of tomatoes and peppers from April to June in 2022, and the tracking use effect was good.

[0071] Example 2

[0072] The coated type polyethylene dust-proof high-thermal-insulation long-acting flow-dripping fog-eliminating shed film described in this embodiment 2 comprises an inner layer, a secondary inner layer, a middle layer, a secondary outer layer, an outer layer and a coating layer.

[0073] The inner layer is a dust-proof and aging-resistant layer, and the inner layer is composed of the following raw materials in mass percentage: metallocene linear low density polyethylene (mLLDPE) 85%, low density polyethylene (LDPE) 0%, acid-resistant aging-resistant masterbatch 8%, and dust-proof masterbatch 7%.

[0074] The secondary inner layer is a thermal-insulation acid-resistant aging-resistant layer, and the secondary inner layer is composed of the following raw materials in mass percentage: metallocene linear low density polyethylene (mLLDPE) 40%, linear low density polyethylene (LLDPE) 25%, low density polyethylene (LDPE) 20%, acid-resistant aging-resistant masterbatch 8%, and barrier thermal-insulation masterbatch 7%.

[0075] The middle layer is a barrier high-thermal-insulation acid-resistant aging-resistant layer, and the middle layer is composed of the following raw materials in mass percentage: metallocene linear low density polyethylene (mLLDPE) 40%, linear low density polyethylene (LLDPE) 25%, low density polyethylene (LDPE) 16%, acid-resistant aging-resistant masterbatch 8%, and barrier thermal-insulation masterbatch 11%.

[0076] The second outer layer is a heat preservation acid resistance aging resistant layer, and the second outer layer is composed of the following raw materials in percentage by mass: metallocene linear low density polyethylene (mLLDPE) 40%, linear low density polyethylene (LLDPE) 24%, low density polyethylene (LDPE) 20%, acid resistance aging resistant masterbatch 8%, and barrier heat preservation masterbatch 8%.

[0077] The outer layer is an aging resistant layer, and the outer layer is composed of the following raw materials in percentage by mass: metallocene linear low density polyethylene (mLLDPE) 92%, and acid resistance aging resistant masterbatch 8%.

[0078] The coating layer is a long-acting flow drop eliminating and mist eliminating layer, and the coating layer is composed of the following raw materials in percentage by mass: coating liquid stock solution 8%, and deionized water 92%.

[0079] In the inner layer raw material: metallocene linear low density polyethylene (m-LLDPE) with a melt index (MI) of 1.0 g / 10 min, model 2010MA, manufactured by Exxon Mobil; acid resistance aging resistant masterbatch 1# (self-made); and dustproof masterbatch model EFT997, manufactured by Tianjin Liren Company.

[0080] The raw material composition and preparation method of the acid resistance aging resistant masterbatch in the inner layer are the same as those in the inner layer of Example 1.

[0081] The second inner layer is a heat preservation acid resistance aging resistant layer, and the second inner layer raw material is composed of the following raw materials: metallocene linear low density polyethylene (mLLDPE) with a melt index (MI) of 0.5 g / 10 min, model XP7052, manufactured by Exxon Mobil; linear low density polyethylene (LLDPE) with a melt index (MI) of 1.0 g / 10 min, model 1001AV, manufactured by Exxon Mobil; low density polyethylene (LDPE) with a melt index (MI) of 0.25 g / 10 min, model 2420D, produced by Daqing Petrochemical; acid resistance aging resistant masterbatch 1# (self-made); and barrier heat preservation masterbatch (self-made).

[0082] The raw material composition and preparation method of the acid resistance aging resistant masterbatch 1# in the second inner layer are the same as those in the inner layer of Example 1.

[0083] The raw material composition and preparation method of the barrier heat preservation masterbatch in the second inner layer are the same as those in the second inner layer of Example 1.

[0084] The middle layer is a high-temperature-resistant acid-resistant layer, and the raw material of the middle layer is metallocene linear low-density polyethylene (mLLDPE) with a melt index (MI) of 0.2 g / 10 min, a model number of XP6026ML, and manufactured by Exxon Mobil; linear low-density polyethylene (LLDPE) with a melt index (MI) of 0.85 g / 10 min, a model number of 9085, and manufactured by Tianjin Union Carbide; low-density polyethylene (LDPE) with a melt index (MI) of 0.25 g / 10 min, a model number of 2420D, and manufactured by Daqing Petrochemical; acid-resistant aging masterbatch 1# (self-made); and a barrier heat preservation masterbatch (self-made).

[0085] The raw material composition and preparation method of the acid-resistant aging masterbatch 1# in the middle layer are the same as those in the inner layer in Example 1.

[0086] The raw material composition and preparation method of the barrier heat preservation masterbatch in the middle layer are the same as those in the secondary inner layer in Example 1.

[0087] In the secondary outer layer, the raw material composition and preparation method of the acid-resistant aging masterbatch 1# are the same as those in the inner layer in Example 1.

[0088] The raw material composition and preparation method of the barrier heat preservation masterbatch in the secondary outer layer are the same as those in the secondary inner layer in Example 1.

[0089] The raw material composition and preparation method of the barrier heat preservation masterbatch in the secondary outer layer are the same as those in the secondary inner layer in Example 1.

[0090] In the outer layer, the raw material composition and preparation method of the acid-resistant aging masterbatch 1# are the same as those in the inner layer in Example 1.

[0091] The raw material composition and preparation method of the acid-resistant aging masterbatch 1# in the outer layer are the same as those in the inner layer in Example 1.

[0092] The coating layer is a dry substance of a coating solution prepared from inorganic aluminum sol, silicon sol and an organic mixed glue solution.

[0093] The coating solution in the coating layer has a model number of TG-188 and is manufactured by Japan Takimoto Fat Co., Ltd.

[0094] The weighed coating liquid stock solution is added to a stainless steel tank, then deionized water is added, stirred uniformly, and after standing for 20 minutes, pumped into the coating liquid tank (temperature control 35℃±2℃) for use. The dry matter content of the coating layer is 0.20g / m 2 .

[0095] The preparation method of the coated polyethylene anti-pesticide dustproof high-thermal-insulation long-acting flow-droplet-fog-eliminating shed film according to the present embodiment 2 comprises the following steps: the components of the inner layer, the secondary inner layer, the middle layer, the secondary outer layer and the outer layer are respectively mixed and stirred uniformly, and then added into a five-layer co-extruder, and then the five-layer co-extruder is subjected to melt plasticization blowing, cooling and setting, traction, corona, coating liquid immersion, drying, edge welding, slit cutting, code spraying and identification, folding to obtain the coated polyethylene anti-pesticide dustproof high-thermal-insulation long-acting flow-droplet-fog-eliminating shed film.

[0096] The preparation method of the coated polyethylene anti-pesticide dustproof high-thermal-insulation long-acting flow-droplet-fog-eliminating shed film according to the present embodiment 2 has the same process conditions as those in Table 1 of the present embodiment 1.

[0097] The prepared product has a specification of 12000 / 0.12mm, and the thickness ratio of the inner layer, the secondary inner layer, the middle layer, the secondary outer layer and the outer layer is 0.75:1.0:1.5:1.0:0.75. The blow-up ratio is 1.7. In the five-layer co-extruder, the temperatures of the inner layer, the secondary inner layer, the middle layer, the secondary outer layer and the outer layer are all 175℃-200℃, and the temperatures of the neck, the die head, the die head bottom and the die ring are 200℃-215℃. The temperatures of the ovens in each zone are 65℃-95℃.

[0098] The coated polyethylene anti-pesticide dustproof high-thermal-insulation long-acting flow-droplet-fog-eliminating shed film according to the present embodiment 2 has a product specification of 12000 / 0.12mm, a designed sulfur resistance S≥3500PPM, a designed chlorine resistance Cl≥300PPM, an expected service life of three years, and was applied to cover and plant grape Sunshine Rose and Nina Queen in the Mengzi region of Yunnan in March 2021. The follow-up use effect is good, and the product has been used for 40 months. According to the user feedback, the product can still be used for 6 months. The shed type height of the shed of the user in Mengzi is 5.8 meters, and the shed is used to plant Sunshine Rose grape.

[0099] Embodiment 3

[0100] The coated polyethylene anti-pesticide dustproof high-thermal-insulation long-acting flow-droplet-fog-eliminating shed film according to the present embodiment 3 comprises an inner layer, a secondary inner layer, a middle layer, a secondary outer layer, an outer layer and a coating layer.

[0101] The inner layer is a dustproof and aging-resistant layer, and the inner layer is composed of the following raw materials in mass percentage: metallocene linear low-density polyethylene (mLLDPE) 80%, low-density polyethylene (LDPE) 6%, acid-resistant aging-resistant masterbatch 1# 7%, and dustproof masterbatch 7%.

[0102] The second inner layer is a heat preservation acid-resistant aging-resistant layer, and the second inner layer is composed of the following raw materials in percentage by mass: metallocene linear low density polyethylene (mLLDPE) 40%, linear low density polyethylene (LLDPE) 25%, low density polyethylene (LDPE) 20%, acid-resistant aging-resistant masterbatch 1# 7%, and heat preservation barrier masterbatch 8%.

[0103] The middle layer is an acid-resistant aging-resistant high heat preservation barrier layer, and the middle layer is composed of the following raw materials in percentage by mass: metallocene linear low density polyethylene (mLLDPE) 40%, linear low density polyethylene (LLDPE) 23%, low density polyethylene (LDPE) 20%, acid-resistant aging-resistant masterbatch 1# 7%, and heat preservation barrier masterbatch 10%.

[0104] The second outer layer is a heat preservation acid-resistant aging-resistant layer, and the second outer layer is composed of the following raw materials in percentage by mass: metallocene linear low density polyethylene (mLLDPE) 40%, linear low density polyethylene (LLDPE) 30%, low density polyethylene (LDPE) 15%, acid-resistant aging-resistant masterbatch 1# 7%, and heat preservation barrier masterbatch 8%.

[0105] The outer layer is an aging-resistant layer, and the outer layer is composed of the following raw materials in percentage by mass: metallocene linear low density polyethylene (mLLDPE) 92%, and acid-resistant aging-resistant masterbatch 1# 8%.

[0106] The coating layer is a long-acting flow-droplet-eliminating mist layer, and the coating layer is composed of the following raw materials in percentage by mass: coating liquid stock solution 8%, and deionized water 92%.

[0107] In the inner layer raw material: metallocene linear low density polyethylene (m-LLDPE) with a melt index (MI) of 1.0 g / 10 min, model 2010MA, manufactured by Exxon Mobil; low density polyethylene (LDPE) with a melt index (MI) of 0.75 g / 10 min, model 2426F, produced by Daqing Petrochemical; acid-resistant aging-resistant masterbatch 1# (self-made); dustproof masterbatch model EFT997, manufactured by Tianjin Liren Company.

[0108] The raw material composition and preparation method of the acid-resistant aging-resistant masterbatch 1# in the inner layer are the same as those in the inner layer of Example 1.

[0109] The second inner layer is a heat preservation acid-resistant aging-resistant layer. The raw materials of the second inner layer include metallocene linear low density polyethylene (mLLDPE) with a melt index (MI) of 0.5 g / 10 min and a brand XP7052 manufactured by Exxon Mobil; low density linear polyethylene (LLDPE) with a melt index (MI) of 1.0 g / 10 min and a brand 1001AV manufactured by Exxon Mobil; low density polyethylene (LDPE) with a melt index (MI) of 0.25 g / 10 min and a brand 2420D produced by Daqing Petrochemical; acid-resistant aging-resistant masterbatch (self-made); and barrier heat preservation masterbatch (self-made).

[0110] The raw material composition and preparation method of the acid-resistant aging-resistant masterbatch 1# in the second inner layer are the same as those of the inner layer in Example 1.

[0111] The raw material composition and preparation method of the barrier heat preservation masterbatch in the second inner layer are the same as those of the second inner layer in Example 1.

[0112] The middle layer is a high heat preservation acid-resistant aging-resistant layer. The raw materials of the middle layer include metallocene linear low density polyethylene (mLLDPE) with a melt index (MI) of 0.5 g / 10 min and a brand XP6056ML manufactured by Exxon Mobil; linear low density linear polyethylene (LLDPE) with a melt index (MI) of 0.85 g / 10 min and a brand 9085 manufactured by Tianjin Union Carbide; low density polyethylene (LDPE) with a melt index (MI) of 0.25 g / 10 min and a brand 2420D produced by Daqing Petrochemical; acid-resistant aging-resistant masterbatch (self-made); and barrier heat preservation masterbatch (self-made).

[0113] The raw material composition and preparation method of the acid-resistant aging-resistant masterbatch 1# in the middle layer are the same as those of the inner layer in Example 1.

[0114] The raw material composition and preparation method of the barrier heat preservation masterbatch in the middle layer are the same as those of the second inner layer in Example 1.

[0115] The raw materials of the second outer layer include metallocene linear low density polyethylene (m-LLDPE) with a melt index (MI) of 0.5 g / 10 min and a brand XP7052 manufactured by Exxon Mobil; linear low density polyethylene (LLDPE) with a melt index (MI) of 0.85 g / 10 min and a brand 9085 manufactured by Tianjin Union Carbide; and low density polyethylene (LDPE) with a melt index (MI) of 0.25 g / 10 min and a brand 2420D produced by Daqing Petrochemical.

[0116] The raw material composition and preparation method of the acid-resistant aging-resistant masterbatch 1# in the second outer layer are the same as those of the inner layer in Example 1.

[0117] The raw material composition and preparation method of the barrier heat preservation masterbatch in the second outer layer are the same as those of the second inner layer in Example 1.

[0118] The outer layer raw material: metallocene linear low density polyethylene (m-LLDPE), melt index (MI) is 1.0 g / 10 min, model 2010MA manufactured by Exxon Mobil; acid-resistant anti-aging masterbatch (self-made).

[0119] The raw material composition and preparation method of the acid-resistant anti-aging masterbatch 1# in the outer layer are the same as those in the inner layer of Example 1.

[0120] The coating layer is a coating liquid dry matter made of inorganic aluminum sol, silica sol and environmentally friendly surfactant and organic mixed glue solution.

[0121] The coating liquid stock of the coating layer is TG-188 produced by Japan Takimoto Oil Company.

[0122] After the weighed coating liquid stock is added to the stainless steel tank, deionized water is added, and stirred uniformly. After standing for 20 minutes, it is pumped into the hanging liquid tank (temperature control 35℃±2℃) for use. The dry matter content of the coating layer is 0.20 g / m 2 .

[0123] The preparation method of the coated polyethylene anti-pesticide dustproof high-thermal-insulation long-acting flow-droplet-eliminating fog-shedding shed film according to the present application is composed of the following steps: the components of the inner layer, the secondary inner layer, the middle layer, the secondary outer layer and the outer layer are mixed and stirred uniformly, respectively, and then added into a five-layer co-extruder. After melting, plasticizing, blowing, cooling, setting, pulling, corona, coating liquid immersion, drying, welding, cutting, code marking, folding, the coated polyethylene anti-pesticide dustproof high-thermal-insulation long-acting flow-droplet-eliminating fog-shedding shed film is obtained.

[0124] The preparation method of the coated polyethylene anti-pesticide dustproof high-thermal-insulation long-acting flow-droplet-eliminating fog-shedding shed film according to the present application is composed of the following steps: the components of the inner layer, the secondary inner layer, the middle layer, the secondary outer layer and the outer layer are mixed and stirred uniformly, respectively, and then added into a five-layer co-extruder. After melting, plasticizing, blowing, cooling, setting, pulling, corona, coating liquid immersion, drying, welding, cutting, code marking, folding, the coated polyethylene anti-pesticide dustproof high-thermal-insulation long-acting flow-droplet-eliminating fog-shedding shed film is obtained.

[0125] The prepared product specification is 12000 / 0.08mm; the thickness ratio of the inner layer, the secondary inner layer, the middle layer, the secondary outer layer and the outer layer is 0.75:1.0:1.5:1.0:0.75; the blowing ratio is 1.7. In the five-layer co-extruder, the temperatures of the inner layer, the secondary inner layer, the middle layer, the secondary outer layer and the outer layer extruders are all 175℃-200℃, and the temperatures of the machine neck, the die head, the die head bottom and the die ring are 200℃-215℃; the oven zone temperatures are 65℃-95℃.

[0126] The coated polyethylene anti-pesticide dustproof high-thermal-insulation long-acting flow-dripping and mist-eliminating shed film described in this embodiment 3 has a specification of 12000 / 0.08 mm, is designed to resist sulfur S≥3000 PPM and resist chlorine Cl≥250 PPM, is a special film for covering grapes, and is expected to have a service life of more than two years. In January 2022, it was applied to cover and plant grapes Klenborn in Xichang, Sichuan, and winter jujube sheds in Weinan, Shaanxi, and the use effect was very good and was recognized by users. In January 2024, 80 tons of the film were supplied to the distributor in Xichang.

[0127] Embodiment 4

[0128] The coated polyethylene anti-pesticide dustproof high-thermal-insulation long-acting flow-dripping and mist-eliminating shed film described in this embodiment 4 comprises an inner layer, a secondary inner layer, a middle layer, a secondary outer layer, an outer layer, and a coating layer.

[0129] The inner layer is a dustproof and aging-resistant layer, and the inner layer is composed of the following raw materials in mass percentage: 74% of metallocene linear low-density polyethylene (mLLDPE), 8% of low-density polyethylene (LDPE), 9% of acid-resistant aging-resistant masterbatch, and 9% of dustproof masterbatch.

[0130] The secondary inner layer is a thermal-insulation acid-resistant aging-resistant layer, and the secondary inner layer is composed of the following raw materials in mass percentage: 40% of metallocene linear low-density polyethylene (mLLDPE), 20% of linear low-density polyethylene (LLDPE), 22% of low-density polyethylene (LDPE), 9% of acid-resistant aging-resistant masterbatch, and 9% of barrier thermal-insulation masterbatch.

[0131] The middle layer is a barrier high-thermal-insulation acid-resistant aging-resistant layer, and the middle layer is composed of the following raw materials in mass percentage: 30% of metallocene linear low-density polyethylene (mLLDPE), 22% of linear low-density polyethylene (LLDPE), 30% of low-density polyethylene (LDPE), 9% of acid-resistant aging-resistant masterbatch, and 9% of barrier thermal-insulation masterbatch.

[0132] The secondary outer layer is a thermal-insulation acid-resistant aging-resistant layer, and the secondary outer layer is composed of the following raw materials in mass percentage: 30% of metallocene linear low-density polyethylene (mLLDPE), 30% of linear low-density polyethylene (LLDPE), 23% of low-density polyethylene (LDPE), 9% of acid-resistant aging-resistant masterbatch, and 8% of barrier thermal-insulation masterbatch.

[0133] The outer layer is an aging-resistant layer, and the outer layer is composed of the following raw materials in mass percentage: 81% of metallocene linear low-density polyethylene (mLLDPE), 10% of low-density polyethylene (LDPE), and 9% of acid-resistant aging-resistant masterbatch.

[0134] The coating layer is a long-acting flow-dripping and mist-eliminating layer, and the coating layer is composed of the following raw materials in mass percentage: 8% of coating liquid stock solution and 92% of deionized water.

[0135] In the inner layer raw material: metallocene linear low density polyethylene (m-LLDPE), melt index (MI) is 1.0 g / 10 min, brand 2010MA, Exxon Mobil manufacturing; low density polyethylene (LDPE) melt index (MI) is 0.75 g / 10 min, brand 2426F, Daqing Petrochemical production; acid resistance type anti-aging masterbatch 2# (self-made); dustproof masterbatch brand is EFT997, Tianjin Riken Company manufacturing.

[0136] In the inner layer, the light stabilizer brand 2011MB of the acid resistance type anti-aging masterbatch (2#) is manufactured by BASF Company, and other raw material compositions and preparation methods are the same as those in the inner layer of Example 1.

[0137] The secondary inner layer is a heat preservation acid resistance anti-aging layer, and in the secondary inner layer raw material: metallocene linear low density polyethylene (m-LLDPE), melt index (MI) is 0.5 g / 10 min, brand XP7052, Exxon Mobil manufacturing; low density linear polyethylene (LLDPE) melt index (MI) is 1.0 g / 10 min, brand 1001AV, Exxon Mobil manufacturing; low density polyethylene (LDPE) melt index (MI) is 0.25 g / 10 min, brand 2420D, Daqing Petrochemical production; acid resistance type anti-aging masterbatch 2# (self-made); barrier heat preservation masterbatch (self-made).

[0138] In the secondary inner layer, the light stabilizer brand of the acid resistance type anti-aging masterbatch 2# is 2011MB, and other raw material compositions and preparation methods are the same as those in the inner layer of Example 1.

[0139] In the secondary inner layer, the raw material composition and preparation method of the barrier heat preservation masterbatch are the same as those in the secondary inner layer of Example 1.

[0140] The middle layer is a high heat preservation acid resistance anti-aging layer, and in the middle layer raw material: metallocene linear low density polyethylene (m-LLDPE), melt index (MI) is 0.2 g / 10 min, brand XP6026ML, Exxon Mobil manufacturing; low density linear polyethylene (LLDPE) melt index (MI) is 0.85 g / 10 min, brand 9085, Tianjin Union Carbide manufacturing; low density polyethylene (LDPE) melt index (MI) is 0.25 g / 10 min, brand 2420D, Daqing Petrochemical production; acid resistance type anti-aging masterbatch 2# (self-made); barrier heat preservation masterbatch (self-made).

[0141] In the middle layer, the light stabilizer brand of the acid resistance type anti-aging masterbatch 2# is 2011MB, and other raw material compositions and preparation methods are the same as those in the inner layer of Example 1.

[0142] In the middle layer, the raw material composition and preparation method of the barrier heat preservation masterbatch are the same as those in the secondary inner layer of Example 1.

[0143] The raw material of the secondary outer layer includes metallocene linear low density polyethylene (m-LLDPE) with a melt index (MI) of 0.5 g / 10 min, produced by Exxon Mobil under the trade name XP7052; linear low density polyethylene (LLDPE) with a melt index (MI) of 0.85 g / 10 min, produced by Tianjin Union Carbide under the trade name 9085; and low density polyethylene (LDPE) with a melt index (MI) of 0.25 g / 10 min, produced by Daqing Petrochemical under the trade name 2420D.

[0144] The light stabilizer of the acid-resistant and aging-resistant masterbatch 2# in the secondary outer layer has the trade name 2011MB, and the other raw materials and the preparation method are the same as those of the inner layer in Example 1.

[0145] The raw material composition and the preparation method of the barrier and heat preservation masterbatch in the secondary outer layer are the same as those of the secondary inner layer in Example 1.

[0146] The raw material of the outer layer includes metallocene linear low density polyethylene (m-LLDPE) with a melt index (MI) of 1.0 g / 10 min, produced by Exxon Mobil under the trade name 2010MA; low density polyethylene (LDPE) with a melt index (MI) of 0.75 g / 10 min, produced by Daqing Petrochemical under the trade name 2426F; and acid-resistant and aging-resistant masterbatch 2# (self-made).

[0147] The light stabilizer of the acid-resistant and aging-resistant masterbatch 2# in the outer layer has the trade name 2011MB, and the other raw materials and the preparation method are the same as those of the inner layer in Example 1.

[0148] The coating layer is dry matter of a coating liquid containing inorganic aluminum sol, silica sol, and environmentally friendly surfactant and organic mixed glue solution.

[0149] The coating liquid stock in the coating layer has the trade name TG-188 and is produced by Japan Takimoto Oil & Fat Co., Ltd.

[0150] The weighed coating liquid stock is added to a stainless steel tank, and then deionized water is added. After stirring uniformly, the mixture is left for 20 minutes, and then pumped into a hanging liquid tank (temperature control 35℃±2℃) for use. The dry matter content of the coating layer is 0.20 g / m 2 .

[0151] The preparation method of the coated polyethylene anti-pesticide dustproof high-heat-preservation long-acting flow-dripping fog-eliminating shed film according to the present embodiment 4 comprises the following steps: the components of the inner layer, the secondary inner layer, the middle layer, the secondary outer layer, and the outer layer are mixed and stirred uniformly, respectively, and then added into a five-layer co-extrusion machine. After melting, plasticizing, blowing, cooling, setting, pulling, corona, coating liquid immersion, drying, edge welding, cutting, code spraying, and folding, the coated polyethylene anti-pesticide dustproof high-heat-preservation long-acting flow-dripping fog-eliminating shed film is obtained.

[0152] The preparation method and process conditions of the coated polyethylene anti-pesticide dustproof high-thermal-insulation long-acting flow-dripping and mist-eliminating shed film described in this embodiment 4 are the same as those in Table 1 in embodiment 1.

[0153] The prepared product specification is 12000 / 0.15mm; the layer thickness ratio of the inner layer, the secondary inner layer, the middle layer, the secondary outer layer and the outer layer is 0.75:1.0:1.5:1.0:0.75; the blowing ratio is 1.7. In the five-layer co-extrusion unit, the extruder temperature of the inner layer, the secondary inner layer, the middle layer, the secondary outer layer and the outer layer is 175℃-200℃, and the temperature of the neck, the die head, the die head bottom and the die ring is 200℃-215℃; the temperature of each zone of the oven is 65℃-95℃.

[0154] The coated polyethylene anti-pesticide dustproof high-thermal-insulation long-acting flow-dripping and mist-eliminating shed film described in this embodiment 4 has a product specification of 12000 / 0.15mm, a designed sulfur resistance S≥5000PPM, a designed chlorine resistance Cl≥450PPM, an expected service life of five years, and is applied to cover and plant grapes, melons and fruits, and flowers in Weifang, Zibo and Linyi regions of Shandong in October 2022 and October 2023 respectively, and the use effect is tracked.

[0155] Embodiment 5

[0156] The coated polyethylene anti-pesticide dustproof high-thermal-insulation long-acting flow-dripping and mist-eliminating shed film described in this embodiment 5 comprises an inner layer, a secondary inner layer, a middle layer, a secondary outer layer, an outer layer and a coating layer.

[0157] Among them:

[0158] The inner layer is a dustproof and aging-resistant layer, and the inner layer is composed of the following raw materials in mass percentage: metallocene linear low density polyethylene (mLLDPE) 74%, low density polyethylene (LDPE) 10%, acid-resistant aging-resistant masterbatch 2# 9%, and dustproof masterbatch 7%.

[0159] The secondary inner layer is a thermal-insulation acid-resistant aging-resistant layer, and the secondary inner layer is composed of the following raw materials in mass percentage: metallocene linear low density polyethylene (mLLDPE) 40%, linear low density polyethylene (LLDPE) 16%, low density polyethylene (LDPE) 25%, acid-resistant aging-resistant masterbatch 2# 9%, and barrier thermal-insulation masterbatch 10%.

[0160] The middle layer is a barrier high-thermal-insulation acid-resistant aging-resistant layer, and the middle layer is composed of the following raw materials in mass percentage: metallocene linear low density polyethylene (mLLDPE) 30%, linear low density polyethylene (LLDPE) 20%, low density polyethylene (LDPE) 30%, acid-resistant aging-resistant masterbatch 1# 9%, and barrier thermal-insulation masterbatch 11%.

[0161] The second outer layer is a heat preservation acid resistance aging resistant layer, and the second outer layer is composed of the following raw materials in percentage by mass: metallocene linear low density polyethylene (mLLDPE) 35%, linear low density polyethylene (LLDPE) 20%, low density polyethylene (LDPE) 30%, acid resistance aging resistant masterbatch 1# 9%, and barrier heat preservation masterbatch 6%.

[0162] The outer layer is an aging resistant layer, and the outer layer is composed of the following raw materials in percentage by mass: metallocene linear low density polyethylene (mLLDPE) 80%, low density polyethylene (LDPE) 10%, and acid resistance aging resistant masterbatch 1# 10%.

[0163] The coating layer is a long-acting drip flow and mist eliminating layer, and the coating layer is composed of the following raw materials in percentage by mass: coating liquid stock solution 8%, and deionized water 92%.

[0164] In the inner layer raw material: metallocene linear low density polyethylene (m-LLDPE) with a melt index (MI) of 1.0 g / 10 min, model 2010MA, manufactured by Exxon Mobil; low density polyethylene (LDPE) with a melt index (MI) of 0.75 g / 10 min, model 2426F, produced by Daqing Petrochemical; acid resistance aging resistant masterbatch 2# (self-made); and dustproof masterbatch model EFT997, manufactured by Tianjin Liren Company.

[0165] The raw material composition and preparation method of the acid resistance aging resistant masterbatch 2# in the inner layer are the same as those in the inner layer of Example 4.

[0166] The second inner layer is a heat preservation acid resistance aging resistant layer, and the second inner layer raw material is composed of the following raw materials in percentage by mass: metallocene linear low density polyethylene (mLLDPE) with a melt index (MI) of 0.5 g / 10 min, model XP7052, manufactured by Exxon Mobil; linear low density polyethylene (LLDPE) with a melt index (MI) of 1.0 g / 10 min, model 1001AV, manufactured by Exxon Mobil; low density polyethylene (LDPE) with a melt index (MI) of 0.25 g / 10 min, model 2420D, produced by Daqing Petrochemical; acid resistance aging resistant masterbatch 2# (self-made); and barrier heat preservation masterbatch (self-made).

[0167] The raw material composition and preparation method of the acid resistance aging resistant masterbatch 2# in the second inner layer are the same as those in the inner layer of Example 4.

[0168] The raw material composition and preparation method of the barrier heat preservation masterbatch in the second inner layer are the same as those in the second inner layer of Example 1.

[0169] The middle layer is a high-thermal-insulation acid-resistant and aging-resistant layer. The raw material of the middle layer is metallocene linear low density polyethylene (mLLDPE) with a melt index (MI) of 0.2 g / 10 min, model XP6026ML, manufactured by Exxon Mobil; linear low density polyethylene (LLDPE) with a melt index (MI) of 0.85 g / 10 min, model 9085, manufactured by Tianjin Union Carbide; low density polyethylene (LDPE) with a melt index (MI) of 0.25 g / 10 min, model 2420D, produced by Daqing Petrochemical; acid-resistant and aging-resistant masterbatch 1# (self-made); and barrier thermal insulation masterbatch (self-made).

[0170] The raw material composition and preparation method of the acid-resistant and aging-resistant masterbatch 1# in the middle layer are the same as those in the inner layer of Example 1.

[0171] The raw material composition and preparation method of the barrier thermal insulation masterbatch in the middle layer are the same as those in the inner layer of Example 1.

[0172] In the raw material of the secondary outer layer: metallocene linear low density polyethylene (m-LLDPE) with a melt index (MI) of 0.5 g / 10 min, model XP7052, manufactured by Exxon Mobil; linear low density polyethylene (LLDPE) with a melt index (MI) of 0.85 g / 10 min, model 9085, produced by Tianjin Union Carbide; and low density polyethylene (LDPE) with a melt index (MI) of 0.25 g / 10 min, model 2420D, produced by Daqing Petrochemical.

[0173] The raw material composition and preparation method of the acid-resistant and aging-resistant masterbatch 1# in the secondary outer layer are the same as those in the inner layer of Example 1.

[0174] The raw material composition and preparation method of the barrier thermal insulation masterbatch in the secondary outer layer are the same as those in the inner layer of Example 1.

[0175] In the raw material of the outer layer: metallocene linear low density polyethylene (m-LLDPE) with a melt index (MI) of 1.0 g / 10 min, model 2010MA, manufactured by Exxon Mobil; low density polyethylene (LDPE) with a melt index (MI) of 0.25 g / 10 min, model 2420D, produced by Daqing Petrochemical; and acid-resistant and aging-resistant masterbatch 1# (self-made).

[0176] The raw material composition and preparation method of the acid-resistant and aging-resistant masterbatch 1# in the outer layer are the same as those in the inner layer of Example 1.

[0177] The coating layer is a dry substance of a coating solution containing inorganic aluminum sol, silicon sol, and environmentally friendly surfactant and organic mixed glue solution.

[0178] The original solution of the coating solution in the coating layer is TG-188, produced by Japan Takimoto Oil and Fat Co., Ltd.

[0179] The weighed coating liquid stock solution is added to a stainless steel tank, then deionized water is added, stirred uniformly, and pumped into a coating liquid tank (temperature control 35℃±2℃) after standing for 20 minutes for use. The dry matter content of the coating layer is 0.20g / m 2 .

[0180] The preparation method of the coated polyethylene anti-pesticide dustproof high-heat-preservation long-acting flow-dripping fog-eliminating shed film described in this embodiment 5 is composed of the following steps: the components of the inner layer, the secondary inner layer, the middle layer, the secondary outer layer and the outer layer are respectively mixed and stirred uniformly, added into a five-layer co-extruder, and then obtained after blowing, cooling, shaping, pulling, corona, coating liquid immersion, drying, welding, cutting, code marking, folding, etc.

[0181] The preparation method of the coated polyethylene anti-pesticide dustproof high-heat-preservation long-acting flow-dripping fog-eliminating shed film described in this embodiment 5 has the same process conditions as Table 1 in embodiment 1.

[0182] The prepared product specification is 12000 / 0.18mm; the thickness ratio of the inner layer, the secondary inner layer, the middle layer, the secondary outer layer and the outer layer is 0.75:1.0:1.5:1.0:0.75; the blowing ratio is 1.7. In the five-layer co-extruder, the temperatures of the inner layer, the secondary inner layer, the middle layer, the secondary outer layer and the outer layer extruders are all 175℃-200℃, and the temperatures of the neck, the die head, the die head bottom and the die ring are 200℃-215℃; the temperatures of each zone of the oven are 65℃-95℃.

[0183] The coated polyethylene anti-pesticide dustproof high-heat-preservation long-acting flow-dripping fog-eliminating shed film described in this embodiment 5 has a product specification of 12000 / 0.18mm, a designed sulfur resistance S ≥6000PPM, and a designed chlorine resistance Cl ≥550PPM.

[0184] This embodiment 5 pursues high cost performance by using two types of light stabilizers in a layered design for composite use. Anti-acid type aging-resistant master batch 2# is used in the inner layer and the secondary inner layer, and anti-acid type aging-resistant master batch 1# is used in the middle layer, the secondary outer layer and the outer layer. The expected service life is more than seven years, and it will be applied to cover grape and flower planting in Kunming and Qingzhou areas in July 2023, and exported to Abu Dhabi in the Middle East in October of the same year, with the use effect being tracked.

[0185] Comparative example 1

[0186] The coated polyethylene dustproof high-heat-preservation long-acting flow-dripping fog-eliminating shed film described in this comparative example 1 comprises an inner layer, a secondary inner layer, a middle layer, a secondary outer layer, an outer layer and a coating layer.

[0187] The inner layer is a dustproof and aging-resistant layer, and the inner layer is composed of the following raw materials in percentage by mass: metallocene linear low density polyethylene (mLLDPE) 75%, low density polyethylene (LDPE) 10%, aging-resistant masterbatch 10%, and dustproof masterbatch 5%.

[0188] The secondary inner layer is a heat-insulating and aging-resistant layer, and the secondary inner layer is composed of the following raw materials in percentage by mass: metallocene linear low density polyethylene (mLLDPE) 40%, linear low density polyethylene (LLDPE) 20%, low density polyethylene (LDPE) 20%, aging-resistant masterbatch 10%, and heat-insulating and barrier masterbatch 10%.

[0189] The middle layer is a heat-insulating and aging-resistant barrier layer, and the middle layer is composed of the following raw materials in percentage by mass: metallocene linear low density polyethylene (mLLDPE) 30%, linear low density polyethylene (LLDPE) 20%, low density polyethylene (LDPE) 28%, aging-resistant masterbatch 10%, and heat-insulating and barrier masterbatch 12%.

[0190] The secondary outer layer is a heat-insulating and aging-resistant layer, and the secondary outer layer is composed of the following raw materials in percentage by mass: metallocene linear low density polyethylene (mLLDPE) 30%, linear low density polyethylene (LLDPE) 22%, low density polyethylene (LDPE) 30%, aging-resistant masterbatch 10%, and heat-insulating and barrier masterbatch 8%.

[0191] The outer layer is an aging-resistant layer, and the outer layer is composed of the following raw materials in percentage by mass: metallocene linear low density polyethylene (mLLDPE) 80%, low density polyethylene (LDPE) 8%, and aging-resistant masterbatch 12%.

[0192] The coating layer is a long-acting flow-droplet-eliminating and mist-eliminating layer, and the coating layer is composed of the following raw materials in percentage by mass: coating liquid stock solution 8% and deionized water 92%.

[0193] In the inner layer raw materials: metallocene linear low density polyethylene (m-LLDPE) with a melt index (MI) of 1.0 g / 10 min, model 2010MC, manufactured by Exxon Mobil; low density polyethylene (LDPE) with a melt index (MI) of 0.25 g / 10 min, model 2420D, produced by Daqing Petrochemical; aging-resistant masterbatch (self-made); and dustproof masterbatch, model EFT997, manufactured by Tianjin Liren Company.

[0194] The aging-resistant masterbatch in the inner layer raw materials is composed of the following raw materials in percentage by mass: low density polyethylene (LDPE) 37%, powdered linear low density polyethylene (LLDPE) 40%, light stabilizer 20%, and antioxidant 3%.

[0195] The low-density polyethylene (LDPE) is 2102TN00 produced by Qilu Petrochemical; the low-density linear polyethylene (LLDPE) is 7042 produced by Qilu Petrochemical; the light stabilizer is 944 produced by BASF; and the antioxidant is B225 produced by Beijing Jixi Company.

[0196] The preparation method of the anti-aging master batch is as follows: accurately weighing low-density polyethylene (LDPE) 2102TN00, low-density linear polyethylene (LLDPE) 7042, light stabilizer 944 and antioxidant B225 into a kneader for plasticizing, then feeding into a single-screw extruder through an open mill, and then performing hot cutting, air cooling and drying to obtain the anti-aging master batch No. 1.

[0197] The temperature of the kneader is 138±2℃, and the plasticizing time is 19±1 minutes; the temperature of each section of the open mill and the single-screw granulator is 145℃-175℃ (175℃ for the first section, 165℃ for the second section and 145℃ for the third section).

[0198] The secondary inner layer is a heat-insulating anti-aging layer, and the raw materials of the secondary inner layer include metallocene linear low-density polyethylene (mLLDPE) with a melt index (MI) of 0.2g / 10min and a brand XP7021 produced by Exxon Mobil, low-density linear polyethylene (LLDPE) with a melt index (MI) of 1.0g / 10min and a brand 1001AV produced by Exxon Mobil, low-density polyethylene (LDPE) with a melt index (MI) of 0.25g / 10min and a brand 2420D produced by Daqing Petrochemical, anti-aging master batch No. 1 (self-made) and heat-insulating barrier master batch (self-made).

[0199] The raw material composition and the preparation method of the anti-aging master batch in the secondary inner layer are the same as those of the anti-aging master batch No. 1 in the inner layer of Comparative Example 1.

[0200] The heat-insulating barrier master batch in the secondary inner layer is composed of the following raw materials in percentage by mass: low-density polyethylene (LDPE) 21%, linear low-density polyethylene (LLDPE) 15%, hydrotalcite heat-insulating agent 60%, coupling agent 2.0%, lubricant 1.0% and dispersant 1.0%; the low-density polyethylene (LDPE) has a melt index (MI) of 2.0g / 10min and is 2102TN00 produced by Qilu Petrochemical; the linear low-density polyethylene (LLDPE) has a melt index (MI) of 2.0g / 10min and is powder with a brand 7042 produced by Qilu Petrochemical; the hydrotalcite heat-insulating agent has a brand HTP and is produced by Japan Sakai Chemical Company; the coupling agent is aluminate produced by Linyi Feiteng Chemical Company; the lubricant is a mixture of zinc stearate and calcium stearate produced by Qingdao Jisihua in a mass ratio of 1:1; and the dispersant is polyethylene wax produced by Qingdao Jisihua.

[0201] The preparation method of the barrier heat preservation master batch is as follows:

[0202] The low density polyethylene (LDPE) 2102 TN00, linear low density polyethylene (LLDPE) 7042, hydrotalcite heat preservation agent HTP, aluminic acid ester coupling agent, zinc stearate and calcium stearate mixed lubricant, and polyethylene wax dispersant are accurately measured according to the proportion, added into a kneader for plasticizing, then fed into a single screw extruder through an open mill, and then hot cut, air-cooled and dried to obtain the barrier heat preservation master batch for standby.

[0203] The temperature of the kneader is 136±1℃, the plasticizing time is 19±1 minutes, and the temperature of each section is 140-170℃ (170℃ in the first section, 160℃ in the second section, and 140℃ in the third section).

[0204] The middle layer is a barrier heat preservation aging resistant layer, and the raw materials of the middle layer include metallocene linear low density polyethylene (mLLDPE) with a melt index (MI) of 0.2 g / 10 min and a brand XP6026ML manufactured by Exxon Mobil, low density linear polyethylene (LLDPE) with a melt index (MI) of 0.85 g / 10 min and a brand 9085 manufactured by Tianjin Union Carbide, low density polyethylene (LDPE) with a melt index (MI) of 0.25 g / 10 min and a brand 2420D produced by Daqing Petrochemical, aging resistant master batch No. 1 (self-made), and barrier heat preservation master batch (self-made).

[0205] The raw material composition and preparation method of the aging resistant master batch No. 1 in the middle layer are the same as those of the aging resistant master batch No. 1 in the inner layer of Comparative Example 1.

[0206] The raw material composition and preparation method of the barrier heat preservation master batch in the middle layer are the same as those of the barrier heat preservation master batch in the inner layer of Comparative Example 1.

[0207] In the secondary outer layer, the metallocene linear low density polyethylene (m-LLDPE) has a melt index (MI) of 0.5 g / 10 min and a brand XP7056 manufactured by Exxon Mobil, the linear low density polyethylene (LLDPE) has a melt index (MI) of 0.85 g / 10 min and a brand 9085 manufactured by Tianjin Union Carbide, and the low density polyethylene (LDPE) has a melt index (MI) of 0.25 g / 10 min and a brand 2420D produced by Daqing Petrochemical.

[0208] The raw material composition and preparation method of the aging resistant master batch No. 1 in the secondary outer layer are the same as those of the aging resistant master batch No. 1 in the inner layer of Comparative Example 1.

[0209] The raw material composition and preparation method of the barrier heat preservation master batch in the secondary outer layer are the same as those of the barrier heat preservation master batch in the inner layer of Comparative Example 1.

[0210] The outer layer raw material: metallocene linear low density polyethylene (m-LLDPE), melt index (MI) is 1.0 g / 10 min, model 2010MA manufactured by Exxon Mobil; low density polyethylene (LDPE) with melt index (MI) of 0.25 g / 10 min, model 2420D produced by Daqing Petrochemical; anti-aging masterbatch (self-made).

[0211] The raw material composition and preparation method of the anti-aging masterbatch in the outer layer are the same as those of the anti-aging masterbatch No. 1 in Comparative Example 1.

[0212] The coating layer is a long-acting anti-dripping and anti-fogging layer, which is composed of the following raw materials in mass percentage: coating liquid stock solution 8%, deionized water 92%.

[0213] The coating layer is a coating liquid dry matter made of inorganic aluminum sol, silica sol, and environmentally friendly surfactant, and organic mixed glue solution.

[0214] The coating liquid stock solution in the coating layer is model TG-188, produced by Japan Takimoto Oil and Fat Co., Ltd.

[0215] After adding the weighed coating liquid stock solution into the stainless steel tank, deionized water is added, and then stirred uniformly. After standing for 20 minutes, it is pumped into the liquid hanging tank (temperature control 35℃±2℃) for standby use. The dry matter content of the coating layer is 0.20 g / m 2 .

[0216] The preparation method and process of the coated polyethylene dustproof high-thermal-insulation long-acting anti-dripping and anti-fogging shed film in Comparative Example 1 are the same as those in Example 1, and are not described again.

[0217] The coated polyethylene dustproof high-thermal-insulation long-acting anti-dripping and anti-fogging shed film in Comparative Example 1 differs from that in Example 1 in that the light stabilizer in the anti-aging masterbatch No. 1 (self-made) is model 944 (NH group) with slight alkalinity, and is not resistant to sulfur and chlorine. The coated light-adjustable dustproof high-thermal-insulation long-acting anti-dripping and anti-fogging shed film prepared in Comparative Example 1 has a specification of 12000 / 0.20 mm, and is expected to have a service life of more than eight years under the condition that the cumulative pesticide content of sulfur S is less than 500 PPM and chlorine Cl is less than 100 PPM in use and management.

[0218] The coated polyethylene dustproof high-thermal-insulation long-acting anti-dripping and anti-fogging shed film in Comparative Example 1 was exported to Bulgaria in May 2019 for covering rose cultivation. Due to the user's use of sulfur-containing pesticides exceeding the standard, the shed film burst only after 16 months.

[0219] The carrier resin in the thermal insulation masterbatch in Comparative Example 1 is different from that in Example 1. The carrier resin in the thermal insulation masterbatch in Comparative Example 1 is a combination of LDPE and LLDPE, while the carrier resin in the thermal insulation masterbatch in Example 1 is a combination of EVA and LLDPE, and there is a difference in infrared transmittance. The dustproof and anti-dripping and anti-fogging performance is comparable to that in Example 1. The performance parameters are shown in Table 2.

[0220] Comparative Example 2

[0221] The coated polyethylene high-thermal-insulation long-acting flow-droplet-eliminating fog-shedding film of the present comparative example 2 comprises an inner layer, a secondary inner layer, a middle layer, a secondary outer layer, an outer layer and a coating layer; wherein: the inner layer is an anti-aging layer, and the inner layer is composed of the following raw materials in mass percentage: metallocene linear low density polyethylene (mLLDPE) 85%, low density polyethylene (LDPE) 7%, and anti-aging masterbatch 8%.

[0222] The secondary inner layer is a thermal-insulation anti-aging layer, and the secondary inner layer is composed of the following raw materials in mass percentage: metallocene linear low density polyethylene (mLLDPE) 40%, linear low density polyethylene (LLDPE) 25%, low density polyethylene (LDPE) 20%, anti-aging masterbatch 8%, and barrier thermal-insulation masterbatch 7%.

[0223] The middle layer is a barrier high-thermal-insulation anti-aging layer, and the middle layer is composed of the following raw materials in mass percentage: metallocene linear low density polyethylene (mLLDPE) 40%, linear low density polyethylene (LLDPE) 25%, low density polyethylene (LDPE) 16%, anti-aging masterbatch 8%, and barrier thermal-insulation masterbatch 11%.

[0224] The secondary outer layer is a thermal-insulation anti-aging layer, and the secondary outer layer is composed of the following raw materials in mass percentage: metallocene linear low density polyethylene (mLLDPE) 40%, linear low density polyethylene (LLDPE) 24%, low density polyethylene (LDPE) 20%, anti-aging masterbatch 8%, and barrier thermal-insulation masterbatch 8%.

[0225] The outer layer is an anti-aging layer, and the outer layer is composed of the following raw materials in mass percentage: metallocene linear low density polyethylene (mLLDPE) 92%, and anti-aging masterbatch 8%.

[0226] The coating layer is a long-acting flow-droplet-eliminating fog-shedding layer, and the coating layer is composed of the following raw materials in mass percentage: coating liquid stock solution 8%, and deionized water 92%.

[0227] In the raw materials of the inner layer: metallocene linear low density polyethylene (m-LLDPE) with a melt index (MI) of 1.0 g / 10 min, model number 2010MA, manufactured by Exxon Mobil; low density polyethylene (LDPE) with a melt index (MI) of 0.75 g / 10 min, model number 2426F, produced by Daqing Petrochemical; anti-aging masterbatch No. 1 (self-made).

[0228] The raw material composition and preparation method of the anti-aging masterbatch No. 1 in the inner layer are the same as those of the inner layer of Comparative Example 1.

[0229] The second inner layer is a heat preservation and aging resistant layer. The raw materials of the second inner layer include metallocene linear low density polyethylene (mLLDPE) with a melt index (MI) of 0.5 g / 10 min, a brand XP7052, manufactured by Exxon Mobil; low density linear polyethylene (LLDPE) with a melt index (MI) of 1.0 g / 10 min, a brand 1001AV, manufactured by Exxon Mobil; low density polyethylene (LDPE) with a melt index (MI) of 0.25 g / 10 min, a brand 2420D, produced by Daqing Petrochemical; aging resistant masterbatch 1# (self-made); and barrier heat preservation masterbatch (self-made).

[0230] The raw material composition and preparation method of the aging resistant masterbatch 1# in the second inner layer are the same as those of the inner layer in Comparative Example 1.

[0231] The raw material composition and preparation method of the barrier heat preservation masterbatch in the second inner layer are the same as those of the second inner layer in Comparative Example 1.

[0232] The middle layer is a heat preservation and aging resistant layer. The raw materials of the middle layer include metallocene linear low density polyethylene (mLLDPE) with a melt index (MI) of 0.2 g / 10 min, a brand XP6026ML, manufactured by Exxon Mobil; low density linear polyethylene (LLDPE) with a melt index (MI) of 0.85 g / 10 min, a brand 9085, manufactured by Tianjin Union Carbide; low density polyethylene (LDPE) with a melt index (MI) of 0.25 g / 10 min, a brand 2420D, produced by Daqing Petrochemical; aging resistant masterbatch 1# (self-made); and barrier heat preservation masterbatch (self-made).

[0233] The raw material composition and preparation method of the aging resistant masterbatch 1# in the middle layer are the same as those of the inner layer in Comparative Example 1.

[0234] The raw material composition and preparation method of the barrier heat preservation masterbatch in the middle layer are the same as those of the second inner layer in Comparative Example 1.

[0235] The raw materials of the second outer layer include metallocene linear low density polyethylene (m-LLDPE) with a melt index (MI) of 0.5 g / 10 min, a brand XP7052, manufactured by Exxon Mobil; linear low density polyethylene (LLDPE) with a melt index (MI) of 0.85 g / 10 min, a brand 9085, produced by Tianjin Union Carbide; and low density polyethylene (LDPE) with a melt index (MI) of 0.25 g / 10 min, a brand 2420D, produced by Daqing Petrochemical.

[0236] The raw material composition and preparation method of the aging resistant masterbatch 1# in the second outer layer are the same as those of the inner layer in Comparative Example 1.

[0237] The raw material composition and preparation method of the barrier heat preservation masterbatch in the second outer layer are the same as those of the second inner layer in Comparative Example 1.

[0238] The outer layer raw material: metallocene linear low density polyethylene (m-LLDPE), melt index (MI) of 1.0 g / 10 min, grade 2010MA manufactured by Exxon Mobil; anti-aging masterbatch 1# (self-made).

[0239] The raw material composition and preparation method of the anti-aging masterbatch 1# in the outer layer are the same as those of the inner layer in Comparative Example 1.

[0240] The coating layer is a coating liquid dry matter prepared from inorganic aluminum sol, silica sol and organic mixed glue solution.

[0241] The coating liquid stock in the coating layer is TG-188 produced by Japan Takimoto Oil and Fat Co., Ltd.

[0242] The weighed coating liquid stock is added to a stainless steel tank, then deionized water is added, stirred uniformly, and pumped into a hanging liquid tank (temperature control 35℃±2℃) after standing for 20 minutes for standby, and the dry matter content of the coating layer is 0.20 g / m 2 .

[0243] The preparation method of the coated polyethylene high-heat-insulation long-acting flow-dropping fog-eliminating shed film in Comparative Example 2 is composed of the following steps: the components of the inner layer, the secondary inner layer, the middle layer, the secondary outer layer and the outer layer are respectively mixed and stirred uniformly, added into a five-layer co-extruder, and then obtained by melt plasticization blow molding, cooling and setting, traction, corona, coating liquid immersion, drying, edge welding, slit cutting, code spraying, folding, to obtain the coated polyethylene dust-proof heat-insulation long-acting flow-dropping fog-eliminating shed film.

[0244] The product specification prepared by Comparative Example 2 is 12000 / 0.12mm; the thickness ratio of the inner layer, the secondary inner layer, the middle layer, the secondary outer layer and the outer layer is 0.75:1.0:1.5:1.0:0.75; the blow ratio is 1.7. In the five-layer co-extruder, the temperatures of the inner layer, the secondary inner layer, the middle layer, the secondary outer layer and the outer layer are all 175℃-200℃, and the temperatures of the machine neck, the die head, the die head bottom and the die ring are 200℃-215℃; the oven zone temperatures are 65℃-95℃.

[0245] The preparation method of the coated polyethylene high-heat-insulation long-acting flow-dropping fog-eliminating shed film in Comparative Example 2 has the same process conditions as those in Table 1 of Example 1, and is not described again. The performance parameters are shown in Table 2.

[0246] The differences between Comparative Example 2 and Example 2 are as follows: first, the inner layer does not add dustproof masterbatch, and the greenhouse film does not have dustproof function. Dust is adsorbed on the greenhouse surface, which is not clean after being washed by rain and snow, directly affecting the obvious decrease of light transmittance. The initial light transmittance is 90.5%, and the light transmittance is 82.8% after 24 months, which decreases by 8.51%; second, the grade and performance of light stabilizer in the anti-aging masterbatch are different. The grade used in Comparative Example 2 is 944, which loses activity when encountering acidic pesticides, while the grade used in Example 2 is NOR356; third, the composition of the barrier and heat preservation masterbatch added in the secondary inner layer, middle layer and secondary outer layer of Comparative Example 2 is the same as that of the secondary inner layer of Comparative Example 1. The carrier resin in the heat preservation masterbatch of Comparative Example 2 is a combination of LDPE and LLDPE, while the carrier resin in the heat preservation masterbatch of Example 2 is a combination of EVA and LLDPE, which has different infrared transmittances. The performance of the long-acting flow drop and fog elimination is equivalent.

[0247] The coated polyethylene dustproof and high-heat-preservation long-acting flow drop and fog elimination greenhouse film described in Comparative Example 2 has a product specification of 12000 / 0.12mm and an expected service life of three years. It was applied to cover and plant grapes and strawberries in Zibo area in October 2021. Because the user frequently fumigated the greenhouse with stone sulfur mixture for sterilization, the greenhouse was locally broken and exploded after being used for 10 months for grape planting and 14 months for strawberry planting.

[0248] Comparative Example 3

[0249] The coated polyethylene dustproof and high-heat-preservation long-acting flow drop and fog elimination greenhouse film described in Comparative Example 3 comprises an inner layer, a secondary inner layer, a middle layer, a secondary outer layer, an outer layer and a coating layer.

[0250] The inner layer is a dustproof and anti-aging layer, which is composed of the following raw materials in mass percentage: metallocene linear low density polyethylene (mLLDPE) 80%, low density polyethylene (LDPE) 6%, anti-aging masterbatch No. 2 7% and dustproof masterbatch 7%.

[0251] The secondary inner layer is a heat preservation and anti-aging layer, which is composed of the following raw materials in mass percentage: metallocene linear low density polyethylene (mLLDPE) 40%, linear low density polyethylene (LLDPE) 25%, low density polyethylene (LDPE) 20%, anti-aging masterbatch No. 2 7% and barrier and heat preservation masterbatch 8%.

[0252] The middle layer is a high-heat-preservation barrier layer, which is composed of the following raw materials in mass percentage: metallocene linear low density polyethylene (mLLDPE) 40%, linear low density polyethylene (LLDPE) 23%, low density polyethylene (LDPE) 20%, anti-aging masterbatch No. 2 7% and barrier and heat preservation masterbatch 10%.

[0253] The second outer layer is a heat preservation and aging resistant layer, and is composed of the following raw materials in percentage by mass: metallocene linear low density polyethylene (mLLDPE) 40%, linear low density polyethylene (LLDPE) 30%, low density polyethylene (LDPE) 15%, aging resistant masterbatch No. 2 7%, and barrier heat preservation masterbatch 8%.

[0254] The outer layer is an aging resistant layer, and is composed of the following raw materials in percentage by mass: metallocene linear low density polyethylene (mLLDPE) 92%, and aging resistant masterbatch No. 2 8%.

[0255] The coating layer is a long-acting drip and mist eliminating layer, and is composed of the following raw materials in percentage by mass: coating liquid stock solution 8%, and deionized water 92%.

[0256] In the inner layer raw materials: metallocene linear low density polyethylene (m-LLDPE) with a melt index (MI) of 1.0 g / 10 min, model 2010MA, manufactured by Exxon Mobil; low density polyethylene (LDPE) with a melt index (MI) of 0.75 g / 10 min, model 2426F, produced by Daqing Petrochemical; aging resistant masterbatch No. 2 (self-made); and dustproof masterbatch, model EFT997, manufactured by Tianjin Liren Company.

[0257] In the inner layer, the raw material light stabilizer of the aging resistant masterbatch No. 2 is model 783 (944:622=1:1), manufactured by BASF Company; other raw materials and preparation methods are the same as those in the inner layer of Comparative Example 1.

[0258] The second inner layer is a heat preservation and aging resistant layer, and in the second inner layer raw materials: metallocene linear low density polyethylene (mLLDPE) with a melt index (MI) of 0.5 g / 10 min, model XP7052, manufactured by Exxon Mobil; low density linear polyethylene (LLDPE) with a melt index (MI) of 1.0 g / 10 min, model 1001AV, manufactured by Exxon Mobil; low density polyethylene (LDPE) with a melt index (MI) of 0.25 g / 10 min, model 2420D, produced by Daqing Petrochemical; aging resistant masterbatch No. 2 (self-made); and barrier heat preservation masterbatch (self-made).

[0259] In the second inner layer, the raw material composition and preparation method of the aging resistant masterbatch No. 2 are the same as those in the inner layer of Comparative Example 3.

[0260] In the second inner layer, the raw material composition and preparation method of the barrier heat preservation masterbatch are the same as those in the second inner layer of Comparative Example 1.

[0261] The middle layer is a high-thermal-insulation anti-aging layer. The raw materials of the middle layer include metallocene linear low density polyethylene (mLLDPE) with a melt index (MI) of 0.5 g / 10 min, a brand XP6056ML manufactured by Exxon Mobil; low density linear polyethylene (LLDPE) with a melt index (MI) of 0.85 g / 10 min, a brand 9085 manufactured by Tianjin Union Carbide; low density polyethylene (LDPE) with a melt index (MI) of 0.25 g / 10 min, a brand 2420D produced by Daqing Petrochemical; anti-aging masterbatch No. 2 (self-made); and barrier thermal insulation masterbatch (self-made).

[0262] The raw material composition and preparation method of the anti-aging masterbatch No. 2 in the middle layer are the same as those in the inner layer of Comparative Example 3.

[0263] The raw material composition and preparation method of the barrier thermal insulation masterbatch in the middle layer are the same as those in the inner layer of Comparative Example 1.

[0264] In the raw materials of the secondary outer layer, metallocene linear low density polyethylene (m-LLDPE) has a melt index (MI) of 0.5 g / 10 min, a brand XP7052 manufactured by Exxon Mobil; linear low density polyethylene (LLDPE) has a melt index (MI) of 0.85 g / 10 min, a brand 9085 manufactured by Tianjin Union Carbide; and low density polyethylene (LDPE) has a melt index (MI) of 0.25 g / 10 min, a brand 2420D produced by Daqing Petrochemical.

[0265] The raw material composition and preparation method of the anti-aging masterbatch No. 2 in the secondary outer layer are the same as those in the inner layer of Comparative Example 3.

[0266] The raw material composition and preparation method of the barrier thermal insulation masterbatch in the secondary outer layer are the same as those in the inner layer of Comparative Example 1.

[0267] In the raw materials of the outer layer, metallocene linear low density polyethylene (m-LLDPE) has a melt index (MI) of 1.0 g / 10 min, a brand 2010MA manufactured by Exxon Mobil; and anti-aging masterbatch No. 2 (self-made).

[0268] The raw material composition and preparation method of the anti-aging masterbatch No. 2 in the outer layer are the same as those in the inner layer of Comparative Example 3.

[0269] The coating layer is dry matter of a coating liquid containing inorganic aluminum sol, silicon sol, and environmentally friendly surfactant and organic mixed glue solution.

[0270] The coating liquid stock in the coating layer has a brand TG-188 and is produced by Japan Takimoto Oil & Fat Co., Ltd.

[0271] The weighed coating liquid stock solution was added to a stainless steel tank, then deionized water was added, stirred uniformly, and pumped into a coating liquid tank (temperature control 35℃±2℃) after standing for 20 minutes for use. The dry matter content of the coating layer was 0.20g / m 2 .

[0272] The preparation method of the coated polyethylene dustproof high-thermal-insulation long-acting flow-droplet-eliminating fog-eliminating shed film according to Comparative Example 3 was the same as that of Example 3 and was not described again. The performance parameters are shown in Table 2.

[0273] The coated polyethylene dustproof high-thermal-insulation long-acting flow-droplet-eliminating fog-eliminating shed film according to Comparative Example 3 had a product specification of 12000 / 0.08mm, an expected service life of more than two years, and was applied to cover and plant cucumbers and strawberries in Shouguang and Qingzhou areas in January 2022. During the user management process, the shed was frequently fumigated with stone sulfur to sterilize, and the sulfur content exceeded the standard after only 12-14 months of use, resulting in local breakage and shed explosion.

[0274] Comparative Example 4

[0275] The coated polyethylene dustproof high-thermal-insulation long-acting flow-droplet-eliminating fog-eliminating shed film according to Comparative Example 4 included an inner layer, a secondary inner layer, a middle layer, a secondary outer layer, an outer layer, and a coating layer.

[0276] The inner layer was a dustproof and aging-resistant layer, and the inner layer was composed of the following raw materials in mass percentage: metallocene linear low-density polyethylene (mLLDPE) 74%, low-density polyethylene (LDPE) 8%, acid-resistant and aging-resistant masterbatch 9%, and dustproof masterbatch 9%.

[0277] The secondary inner layer was a thermal-insulation acid-resistant and aging-resistant layer, and the secondary inner layer was composed of the following raw materials in mass percentage: metallocene linear low-density polyethylene (mLLDPE) 40%, linear low-density polyethylene (LLDPE) 20%, low-density polyethylene (LDPE) 22%, acid-resistant and aging-resistant masterbatch 9%, and barrier thermal-insulation masterbatch 9%.

[0278] The middle layer was a barrier high-thermal-insulation acid-resistant and aging-resistant layer, and the middle layer was composed of the following raw materials in mass percentage: metallocene linear low-density polyethylene (mLLDPE) 30%, linear low-density polyethylene (LLDPE) 22%, low-density polyethylene (LDPE) 30%, acid-resistant and aging-resistant masterbatch 9%, and barrier thermal-insulation masterbatch 9%.

[0279] The secondary outer layer was a thermal-insulation acid-resistant and aging-resistant layer, and the secondary outer layer was composed of the following raw materials in mass percentage: metallocene linear low-density polyethylene (mLLDPE) 30%, linear low-density polyethylene (LLDPE) 30%, low-density polyethylene (LDPE) 23%, acid-resistant and aging-resistant masterbatch 9%, and barrier thermal-insulation masterbatch 8%.

[0280] The outer layer is an anti-aging layer, and the outer layer is composed of the following raw materials in percentage by mass: metallocene linear low density polyethylene (mLLDPE) 81%, low density polyethylene (LDPE) 10%, and anti-acid anti-aging masterbatch 9%.

[0281] The coating layer is a long-acting anti-dripping and anti-fogging layer, and the coating layer is composed of the following raw materials in percentage by mass: coating liquid stock solution 8%, and deionized water 92%.

[0282] In the inner layer, the metallocene linear low density polyethylene (m-LLDPE) has a melt index (MI) of 1.0 g / 10 min and a brand 2010MA manufactured by Exxon Mobil; the low density polyethylene (LDPE) has a melt index (MI) of 0.75 g / 10 min and a brand 2426F produced by Daqing Petrochemical; the anti-acid anti-aging masterbatch 3# is self-made; and the dustproof masterbatch has a brand EFT997 manufactured by Tianjin Liren Company.

[0283] In the inner layer, the light stabilizer of the anti-acid anti-aging masterbatch 3# has a brand 119 (for improving anti-acid type) manufactured by BASF Company, and other raw materials and preparation methods are the same as those in the inner layer of Example 1 to obtain the anti-acid anti-aging masterbatch 3#.

[0284] The secondary inner layer is a heat preservation anti-acid anti-aging layer, and in the secondary inner layer, the metallocene linear low density polyethylene (mLLDPE) has a melt index (MI) of 0.5 g / 10 min and a brand XP7052 manufactured by Exxon Mobil; the low density linear polyethylene (LLDPE) has a melt index (MI) of 1.0 g / 10 min and a brand 1001AV manufactured by Exxon Mobil; the low density polyethylene (LDPE) has a melt index (MI) of 0.25 g / 10 min and a brand 2420D produced by Daqing Petrochemical; the anti-acid anti-aging masterbatch 3# is self-made; and the barrier heat preservation masterbatch is self-made.

[0285] In the secondary inner layer, the light stabilizer of the anti-acid anti-aging masterbatch 3# has a brand 119, and other raw materials and preparation methods are the same as those in the inner layer of Example 1.

[0286] In the secondary inner layer, the raw materials and preparation methods of the barrier heat preservation masterbatch are the same as those in the secondary inner layer of Comparative Example 1.

[0287] The middle layer is a high-temperature-resistant acid-resistant layer, and the raw materials of the middle layer are metallocene linear low-density polyethylene (mLLDPE) with a melt index (MI) of 0.2 g / 10 min, a brand XP6026ML manufactured by Exxon Mobil; low-density linear polyethylene (LLDPE) with a melt index (MI) of 0.85 g / 10 min, a brand 9085 manufactured by Tianjin Union Carbide; low-density polyethylene (LDPE) with a melt index (MI) of 0.25 g / 10 min, a brand 2420D produced by Daqing Petrochemical; acid-resistant aging masterbatch 3# (self-made); and a barrier heat preservation masterbatch (self-made).

[0288] The light stabilizer of the acid-resistant aging masterbatch 3# in the middle layer is brand 119, and the other raw material compositions and preparation methods are the same as those of the inner layer in Example 1.

[0289] The raw material compositions and preparation methods of the barrier heat preservation masterbatch in the middle layer are the same as those of the inner layer in Comparative Example 1.

[0290] In the raw materials of the secondary outer layer: metallocene linear low-density polyethylene (m-LLDPE) with a melt index (MI) of 0.5 g / 10 min, a brand XP7052 manufactured by Exxon Mobil; linear low-density polyethylene (LLDPE) with a melt index (MI) of 0.85 g / 10 min, a brand 9085 produced by Tianjin Union Carbide; and low-density polyethylene (LDPE) with a melt index (MI) of 0.25 g / 10 min, a brand 2420D produced by Daqing Petrochemical.

[0291] The light stabilizer of the acid-resistant aging masterbatch 3# in the secondary outer layer is brand 119, and the other raw material compositions and preparation methods are the same as those of the inner layer in Example 1.

[0292] The raw material compositions and preparation methods of the barrier heat preservation masterbatch in the secondary outer layer are the same as those of the inner layer in Comparative Example 1.

[0293] In the raw materials of the outer layer: metallocene linear low-density polyethylene (m-LLDPE) with a melt index (MI) of 1.0 g / 10 min, a brand 2010MA manufactured by Exxon Mobil; low-density polyethylene (LDPE) with a melt index (MI) of 0.75 g / 10 min, a brand 2426F produced by Daqing Petrochemical; and acid-resistant aging masterbatch 3# (self-made).

[0294] The light stabilizer of the acid-resistant aging masterbatch 3# in the outer layer is brand 119, and the other raw material compositions and preparation methods are the same as those of the inner layer in Example 1.

[0295] The coating layer is a coating liquid dry matter containing inorganic aluminum sol, silica sol, and environmentally friendly surfactant and organic mixed glue solution.

[0296] The coating layer has a coating liquid stock solution brand TG-188 produced by Japan Takimoto Oil & Fat Co., Ltd.

[0297] The weighed coating liquid stock solution is added to a stainless steel tank, then deionized water is added, stirred uniformly, and pumped into a hanging liquid tank (temperature control 35℃±2℃) after standing for 20 minutes for standby use, and the dry matter content of the coating layer is 0.20g / m 2 .

[0298] The preparation method of the coated polyethylene anti-pesticide dustproof high-heat preservation long-acting flow dripping and mist eliminating shed film in Comparative Example 4 is as follows: the components of the inner layer, the secondary inner layer, the middle layer, the secondary outer layer and the outer layer are mixed and stirred uniformly respectively, and then added into a five-layer co-extruder, and then the five-layer co-extruder is subjected to melt plasticization blowing, cooling and setting, traction, corona, coating liquid immersion, drying, edge welding, slotting, code spraying, folding to obtain the coated polyethylene anti-pesticide dustproof high-heat preservation long-acting flow dripping and mist eliminating shed film.

[0299] The preparation method of the coated polyethylene anti-pesticide dustproof high-heat preservation long-acting flow dripping and mist eliminating shed film in Comparative Example 4 has the same process conditions as Table 1 in Example 1.

[0300] The product specification obtained by Comparative Example 4 is 12000 / 0.15mm; the thickness ratio of the inner layer, the secondary inner layer, the middle layer, the secondary outer layer and the outer layer is 0.75:1.0:1.5:1.0:0.75; the blow-up ratio is 1.7. In the five-layer co-extruder, the temperatures of the inner layer, the secondary inner layer, the middle layer, the secondary outer layer and the outer layer extruders are all 175℃-200℃, the temperatures of the machine neck, the die head, the die head bottom and the die ring are 200℃-215℃; the temperatures of the oven zones are 65℃-95℃.

[0301] The coated polyethylene anti-pesticide dustproof high-heat preservation long-acting flow dripping and mist eliminating shed film in Comparative Example 4 has a product specification of 12000 / 0.15mm, a designed sulfur resistance S≤2000PPM, a designed chlorine resistance Cl≤180PPM, an expected service life of 3 years, and is applied to cover and plant grapes in Xichang, Sichuan in January 2021, and the result is that the shed is broken only after 15-17 months of use.

[0302] Comparative Example 5

[0303] The coated polyethylene anti-pesticide dustproof high-heat preservation long-acting flow dripping and mist eliminating shed film in Comparative Example 5 comprises an inner layer, a secondary inner layer, a middle layer, a secondary outer layer, an outer layer and a coating layer.

[0304] The inner layer is a dustproof and aging-resistant layer, and the inner layer is composed of the following raw materials in mass percentage: metallocene linear low density polyethylene (mLLDPE) 74%, low density polyethylene (LDPE) 10%, acid-resistant aging-resistant masterbatch 3# 9%, and dustproof masterbatch 7%.

[0305] The second inner layer is a heat preservation acid-resistant aging-resistant layer, and the second inner layer is composed of the following raw materials in mass percentage: metallocene linear low density polyethylene (mLLDPE) 40%, linear low density polyethylene (LLDPE) 16%, low density polyethylene (LDPE) 25%, acid-resistant aging-resistant masterbatch 3# 9%, and barrier heat preservation masterbatch 10%.

[0306] The middle layer is a barrier high heat preservation acid-resistant aging-resistant layer, and the middle layer is composed of the following raw materials in mass percentage: metallocene linear low density polyethylene (mLLDPE) 30%, linear low density polyethylene (LLDPE) 20%, low density polyethylene (LDPE) 30%, acid-resistant aging-resistant masterbatch 3# 9%, and barrier heat preservation masterbatch 11%.

[0307] The second outer layer is a heat preservation acid-resistant aging-resistant layer, and the second outer layer is composed of the following raw materials in mass percentage: metallocene linear low density polyethylene (mLLDPE) 35%, linear low density polyethylene (LLDPE) 20%, low density polyethylene (LDPE) 30%, acid-resistant aging-resistant masterbatch 3# 9%, and barrier heat preservation masterbatch 6%.

[0308] The outer layer is an aging-resistant layer, and the outer layer is composed of the following raw materials in mass percentage: metallocene linear low density polyethylene (mLLDPE) 80%, low density polyethylene (LDPE) 10%, and acid-resistant aging-resistant masterbatch 3# 10%.

[0309] The coating layer is a long-acting flow-droplet-eliminating and mist-eliminating layer, and the coating layer is composed of the following raw materials in mass percentage: coating liquid stock solution 8% and deionized water 92%.

[0310] In the inner layer raw material: metallocene linear low density polyethylene (m-LLDPE) with a melt index (MI) of 1.0 g / 10 min, model number 2010MA, manufactured by Exxon Mobil; low density polyethylene (LDPE) with a melt index (MI) of 0.75 g / 10 min, model number 2426F, produced by Daqing Petrochemical; acid-resistant aging-resistant masterbatch 2# (self-made); dustproof masterbatch model number EFT997, manufactured by Tianjin Liren Company.

[0311] The raw material composition and preparation method of the acid-resistant aging-resistant masterbatch 3# in the inner layer are the same as those in the inner layer of Comparative Example 4.

[0312] The second inner layer is a heat preservation acid-resistant aging-resistant layer. The raw materials of the second inner layer include metallocene linear low density polyethylene (mLLDPE) with a melt index (MI) of 0.5 g / 10 min, a brand XP7052, manufactured by Exxon Mobil; low density linear polyethylene (LLDPE) with a melt index (MI) of 1.0 g / 10 min, a brand 1001AV, manufactured by Exxon Mobil; low density polyethylene (LDPE) with a melt index (MI) of 0.25 g / 10 min, a brand 2420D, produced by Daqing Petrochemical; acid-resistant aging-resistant masterbatch 3# (self-made); and barrier heat preservation masterbatch (self-made).

[0313] The raw material composition and preparation method of the acid-resistant aging-resistant masterbatch 3# in the second inner layer are the same as those of the inner layer in Comparative Example 4.

[0314] The raw material composition and preparation method of the barrier heat preservation masterbatch in the second inner layer are the same as those of the second inner layer in Comparative Example 1.

[0315] The middle layer is a high heat preservation acid-resistant aging-resistant layer. The raw materials of the middle layer include metallocene linear low density polyethylene (mLLDPE) with a melt index (MI) of 0.2 g / 10 min, a brand XP6026ML, manufactured by Exxon Mobil; low density linear polyethylene (LLDPE) with a melt index (MI) of 0.85 g / 10 min, a brand 9085, manufactured by Tianjin Union Carbide; low density polyethylene (LDPE) with a melt index (MI) of 0.25 g / 10 min, a brand 2420D, produced by Daqing Petrochemical; acid-resistant aging-resistant masterbatch 3# (self-made); and barrier heat preservation masterbatch (self-made).

[0316] The raw material composition and preparation method of the acid-resistant aging-resistant masterbatch 3# in the middle layer are the same as those of the inner layer in Comparative Example 4.

[0317] The raw material composition and preparation method of the barrier heat preservation masterbatch in the middle layer are the same as those of the second inner layer in Comparative Example 1.

[0318] The raw materials of the second outer layer include metallocene linear low density polyethylene (m-LLDPE) with a melt index (MI) of 0.5 g / 10 min, a brand XP7052, manufactured by Exxon Mobil; linear low density polyethylene (LLDPE) with a melt index (MI) of 0.85 g / 10 min, a brand 9085, produced by Tianjin Union Carbide; and low density polyethylene (LDPE) with a melt index (MI) of 0.25 g / 10 min, a brand 2420D, produced by Daqing Petrochemical.

[0319] The raw material composition and preparation method of the acid-resistant aging-resistant masterbatch 3# in the second outer layer are the same as those of the inner layer in Comparative Example 4.

[0320] The raw material composition and preparation method of the barrier heat preservation masterbatch in the second outer layer are the same as those of the second inner layer in Comparative Example 1.

[0321] The outer layer raw material: metallocene linear low density polyethylene (m-LLDPE), melt index (MI) is 1.0 g / 10 min, brand 2010MA manufactured by Exxon Mobil; low density polyethylene (LDPE) with melt index (MI) of 0.25 g / 10 min, brand 2420D produced by Daqing Petrochemical; acid-resistant aging masterbatch 3# is self-made.

[0322] The raw material composition and preparation method of the acid-resistant aging masterbatch 3# in the outer layer are the same as those in the inner layer of Comparative Example 4.

[0323] The coating layer is a coating liquid dry matter containing inorganic aluminum sol, silica sol and environmentally friendly surfactant and organic mixed glue solution.

[0324] The coating liquid stock in the coating layer is TG-188 produced by Japan Takimoto Oil and Fat Co., Ltd.

[0325] The weighed coating liquid stock is added to a stainless steel tank, then deionized water is added, stirred uniformly, and pumped into a hanging liquid tank (temperature control 35℃±2℃) after standing for 20 minutes for standby, and the dry matter content of the coating layer is 0.20 g / m 2 .

[0326] The preparation method of the coated polyethylene anti-pesticide dustproof high-heat long-acting flow-dropping fog-eliminating shed film in Comparative Example 5 is as follows: the components of the inner layer, the secondary inner layer, the middle layer, the secondary outer layer and the outer layer are respectively mixed and stirred uniformly, and then added into a five-layer co-extruder, and then the coated polyethylene anti-pesticide dustproof high-heat long-acting flow-dropping fog-eliminating shed film is obtained after melt plasticization blowing, cooling and setting, traction, corona, coating liquid immersion, drying, welding, cutting, code marking, folding.

[0327] The preparation method of the coated polyethylene anti-pesticide dustproof high-heat long-acting flow-dropping fog-eliminating shed film in Comparative Example 5 has the same process conditions as those in Table 1 in Example 1.

[0328] The product specification prepared by Comparative Example 5 is 12000 / 0.13mm; the layer thickness ratio of the inner layer, the secondary inner layer, the middle layer, the secondary outer layer and the outer layer is 0.75:1.0:1.5:1.0:0.75; the blow-up ratio is 1.7. In the five-layer co-extruder, the extruder temperature of the inner layer, the secondary inner layer, the middle layer, the secondary outer layer and the outer layer is 175℃-200℃, and the neck, the die head, the die head bottom and the die ring temperature is 200℃-215℃; the oven zone temperature is 65℃-95℃.

[0329] The coated polyethylene anti-pest dust-proof high-thermal-insulation long-acting flow-dripping and mist-eliminating shed film described in Comparative Example 5, product specification 12000 / 0.13 mm, grade 119, belongs to an improved type of anti-pest light stabilizer, which can only resist medium and low content of sulfur and chlorine, and is designed to resist sulfur S≤1500 PPM and chlorine Cl≤130 PPM, with a service life of 2 years. It was applied to cover and plant tomatoes in the Hami and Turpan regions of Xinjiang in April 2023, and the use effect is being tracked.

[0330] Table 2: Test results of various properties of samples

[0331]

[0332] The test results reflected in Table 2 show that the mechanical properties, optical properties, and flow-dripping performance data of Examples 1-5 and Comparative Examples 1-5 are all better than the technical index requirements of national standard GB / T4455-2019, and can meet the most basic requirements for greenhouse covering purposes. The thermal insulation masterbatch in Examples 1-5 uses EVA resin as the carrier resin, and the infrared transmittance is reduced by 11%-40.56% compared with Comparative Examples 1-5 (among them: the infrared transmittance of Example 1 is reduced by 23.95% compared with Comparative Example 1; the infrared transmittance of Example 2 is reduced by 16.39% compared with Comparative Example 2; the infrared transmittance of Example 3 is reduced by 11.01% compared with Comparative Example 3; the infrared transmittance of Example 4 is reduced by 18.77% compared with Comparative Example 4; the infrared transmittance of Example 5 is reduced by 40.56% compared with Comparative Example 5), which increases the nighttime thermal insulation performance by 2-3℃, and the accumulated temperature efficiency is high, and the crops can bloom and bear fruit 4-7 days earlier.

[0333] Table 3: Flow-dripping and mist-eliminating performance water bath experiment

[0334]

[0335] Table 3: Flow-dripping and mist-eliminating performance is tested according to 4.6 flow-dripping performance test in national standard "coated long-lasting flow-dripping polyethylene shed film" standard QB / T4475-2013, 1-year film experiment time is 30d, 2-year film experiment time is 45d, 3-year film experiment time is 60d, 4-year film experiment time is 75d, 5-year film experiment time is 90d, 6-year is 105d, 7-year is 120d, and 8-year is 135d.

[0336] Examples 1-5 and Comparative Examples 1-5 are used as the covering material of the overwintering greenhouse, especially in the winter greenhouse, the temperature difference between the inside and outside of the greenhouse is large, fog and water droplets are generated on the greenhouse film, which hinders the transmission of sunlight and weakens photosynthesis, affecting crop growth, and the humidity in the greenhouse rises, water droplets falling on crops can cause downy mildew and the breeding of pests and diseases, resulting in reduced yield. The flow and drop fog elimination function of the greenhouse film is to reduce the formation of fog droplets on the inner surface of the greenhouse film, and to change the water droplets into water film, flow down along the film surface, while reducing and eliminating the fog in the greenhouse, and enhancing the light effect of the crops. The flow and drop fog elimination performance of the greenhouse film is an important key functional indicator, and the test results of the flow and drop performance at 60°C in the laboratory water bath for 135 days are all excellent.

[0337] Table 4: Dust prevention test results

[0338]

[0339] In Table 4: excellent for light transmittance ≥ 85%, good for 85 > light transmittance ≥ 80%, general for 80 > light transmittance ≥ 75%, and poor for light transmittance < 75%. Due to the permanent antibacterial, antistatic and smooth effects of the dust prevention masterbatch, the friction coefficient of the greenhouse film surface is greatly reduced (0.1-0.13), dust is not easy to adhere to the film surface, and it is bright and new after being blown by the wind and washed by the rain, the annual decay rate of light transmittance is significantly reduced, and the annual decay rate is only below 1.0%. Compared with the existing advanced technology level in the agricultural film industry, the annual decay rate is improved by 28.5%-33.3%, and the annual decay rate of light transmittance is low, which is a necessary condition for long-term use of greenhouse film.

[0340] The acid resistance and weather resistance of the greenhouse film prepared from Examples 1-5 and Comparative Examples 4-5 were tested. The experimental equipment used a xenon lamp weathering chamber, and the test was conducted in accordance with GB / T16422.2-2014 Plastic Laboratory Light Source Exposure Test Method; the irradiation method was according to method A, the irradiance was 0.51 W / (m 2 The acid resistance and weather resistance of the greenhouse film prepared from Examples 1-5 and Comparative Examples 4-5 were tested. The experimental equipment used a xenon lamp weathering chamber, and the test was conducted in accordance with GB / T16422.2-2014 Plastic Laboratory Light Source Exposure Test Method; the irradiation method was according to method A, the irradiance was 0.51 W / (m

[0341] Table 5: Tensile strength test results

[0342] Table 5: Tensile strength test results

[0342]

[0343] Table 6 Tensile strength retention test results

[0344]

[0345] Table 7 Breaking nominal strain test results

[0346]

[0347] Table 8 Breaking nominal strain retention test results

[0348]

[0349] The above experimental data verifies that the acid resistance and aging resistance performance of the greenhouse film samples prepared by Examples 1-5 of the application is reliable, and fully meets the technical requirements specified in GB / T4455-2019. The improved acid-resistant light stabilizer 119 used in Comparative Examples 4-5 can only be used as a low-grade light stabilizer for acid content with sulfur resistance S < 1500 PPM and chlorine resistance Cl < 150 PPM. The 944 and 783 light stabilizers used in Comparative Examples 1-3 have sulfur resistance S < 500 PPM and chlorine resistance Cl < 100 PPM, and are not suitable for use in acidic pesticide environments.

Claims

1. A coated polyethylene anti-dust and high-thermal-insulation long-acting flow-droplet-eliminating fog-preventing shed film, characterized in that: The thickness ranges from 0.06mm to 0.25mm, and is composed of an inner layer, a sub-inner layer, a middle layer, a sub-outer layer, an outer layer and a coating layer, and the thickness ratio of the inner layer, the sub-inner layer, the middle layer, the sub-outer layer and the outer layer is 0.75:1.0:1.5:1.0:0.75; The inner layer is a dustproof and aging-resistant layer, and is composed of the following raw materials in percentage by mass: metallocene linear low-density polyethylene 70%-85%, low-density polyethylene 0-10%, acid-resistant aging-resistant masterbatch 7%-10%, and dustproof masterbatch 7%-10%; the sub-inner layer is a heat-insulating and acid-resistant aging-resistant layer, and is composed of the following raw materials in percentage by mass: metallocene linear low-density polyethylene 40%, linear low-density polyethylene 16-25%, low-density polyethylene 20-25%, acid-resistant aging-resistant masterbatch 7%-10%, and heat-insulating and barrier masterbatch 7%-10%; the middle layer is an acid-resistant aging-resistant high-heat-insulating barrier layer, and is composed of the following raw materials in percentage by mass: metallocene linear low-density polyethylene 30-40%, linear low-density polyethylene 20-25%, low-density polyethylene 16-30%, acid-resistant aging-resistant masterbatch 7%-10%, and heat-insulating and barrier masterbatch 9%-12%; the sub-outer layer is an acid-resistant heat-insulating layer, and is composed of the following raw materials in percentage by mass: metallocene linear low-density polyethylene 30-40%, linear low-density polyethylene 20-30%, low-density polyethylene 15-30%, acid-resistant aging-resistant masterbatch 7%-10%, and heat-insulating and barrier masterbatch 6%-8%; the outer layer is an acid-resistant aging-resistant layer, and is composed of the following raw materials in percentage by mass: metallocene linear low-density polyethylene 80%-92%, low-density polyethylene 0-10%, and acid-resistant aging-resistant masterbatch 8%-10%; and the coating layer is a long-acting flow-droplet-eliminating and mist-eliminating layer; Wherein: The acid-resistant aging-resistant masterbatch in the inner layer, the sub-inner layer, the middle layer, the sub-outer layer and the outer layer has the same raw material composition, and is composed of the following raw materials in percentage by mass: low-density polyethylene 33%-43%, linear low-density polyethylene 40%-43%, acid-resistant light stabilizer 12%-24%, and antioxidant 2%-3%; the acid-resistant light stabilizer is a hindered amine-based nitroxyl type or a combination of nitroxyl and nitryl types; The acid-resistant light stabilizer is at least one of NOR356, NOR371, 2011MB, XT200 or XT-8, NOR356, NOR371, 2011MB and XT200 are produced by BASF Company, and XT-8 is produced by Beijing Tian Gong Company; The heat-insulating and barrier masterbatch in the sub-inner layer, the middle layer and the sub-outer layer has the same raw material composition, and is composed of the following raw materials in percentage by mass: ethylene-vinyl acetate copolymer resin 20%-25%, linear low-density polyethylene 15%-23%, hydrotalcite heat-insulating agent 50%-60%, coupling agent 1.0%-3.0%, lubricant 0.5%-1.5%, and dispersant 0.5%-1.5%; The coating layer is composed of the following raw materials in percentage by mass: 8% of the new scratch-resistant coating solution stock solution, and 92% of deionized water; the new scratch-resistant coating solution stock solution is any one of TG-188 or TF-820C.

2. The coated polyethylene anti-pesticide dust-proof high-thermal-insulation long-acting flow-droplet-eliminating mist-shedding shed film according to claim 1, characterized in that: The acid-proof and aging-resistant master batch in the inner layer, the secondary inner layer, the middle layer, the secondary outer layer and the outer layer has the same composition, which is composed of the following raw materials in percentage by mass: 37% of low-density polyethylene, 40% of linear low-density polyethylene, 20% of acid-proof light stabilizer and 3% of antioxidant.

3. The coated polyethylene anti-pesticide dust-proof high-thermal-insulation long-acting flow-droplet-eliminating mist-shedding shed film according to claim 1, characterized in that: The low-density polyethylene in the acid-proof and aging-resistant master batch has a melt index of 2.0 g / 10 min; the linear low-density polyethylene has a melt index of 2.0 g / 10 min; the antioxidant is a composite of hindered phenol and phosphite, and the antioxidant is any one of B215 or B225; The acid-proof and aging-resistant master batch is prepared by the following method: the low-density polyethylene, the linear low-density polyethylene, the acid-proof light stabilizer and the antioxidant are added into a banbury mixer in proportion for kneading and plasticizing, and then fed into a single-screw extruder through an open mill, and the obtained product is cut into particles by heating, dried by air cooling, and then the acid-proof and aging-resistant master batch is obtained; wherein, the temperature of the banbury mixer is 125-140 ℃, the plasticizing time is 15-20 min, and the temperature of the open mill and the single-screw extruder is 145-175 ℃.

4. The coated polyethylene anti-pesticide dusting high-thermal-retention long-acting drip-flowing mist-eliminating shed film according to claim 1, characterized in that: The raw materials used in the inner layer, the secondary inner layer, the middle layer, the secondary outer layer and the outer layer have the following specific parameters: The metallocene linear low-density polyethylene has a density of 0.911-0.920 g / cm3 and a melt index of 0.2-1.0 g / 10 min; The linear low-density polyethylene has a density of 0.918-0.922 g / cm3 and a melt index of 0.8-1.0 g / 10 min; The low-density polyethylene has a density of 0.920-0.923 g / cm3 and a melt index of 0.2-1.0 g / 10 min; The dust-proof master batch in the inner layer is a commercially available product with the brand EFT997 or EFT998 produced by Tianjin Liren Company, or a maleic anhydride grafted dust-proof master batch with the brand BE-10F produced by Jilin Baineng Plastic Technology Company.

5. The coated polyethylene anti-pesticide dusting high-thermal-retention long-acting drip-flowing mist-eliminating shed film according to claim 1, characterized in that: The ethylene-vinyl acetate copolymer resin in the barrier and thermal insulation master batch has a melt index of 2.0-3.0 g / 10 min; the linear low-density polyethylene has a melt index of 2.0 g / 10 min; the hydrotalcite thermal insulation agent has the brand HTP and is manufactured by Kasai Chemical Company, Japan, or the brand HT3 manufactured by Dandong Xiehe Company; the coupling agent is any one of titanate or aluminate; the lubricant is any one of zinc stearate or calcium stearate; and the dispersant is polyethylene wax; The barrier and thermal insulation master batch is prepared by the following steps: the ethylene-vinyl acetate copolymer resin, the linear low-density polyethylene, the hydrotalcite thermal insulation agent, the coupling agent, the lubricant and the dispersant are added into a banbury mixer in proportion for kneading and plasticizing, and then fed into a single-screw extruder through an open mill, and the obtained product is cut into particles by heating, dried by air cooling, and then the barrier and thermal insulation master batch is obtained. Wherein: the temperature of the internal mixer is 125-140 DEG C, the plasticizing time is 17-20 minutes, the temperature of the open mill and single screw extruder is 145-175 DEG C.

6. The preparation method of the coated polyethylene anti-pesticide dust-proof high-thermal-insulation long-acting flow-droplet-eliminating mist-shedding shed film according to claim 1, characterized in that: The method comprises the following steps: uniformly mixing and stirring each component material of the inner layer, the secondary inner layer, the middle layer, the secondary outer layer and the outer layer, adding the materials into a five-layer co-extrusion machine, and obtaining the coated polyethylene anti-pesticide dustproof high-thermal-insulation long-acting flow-dripping anti-mist shed film through the following steps: melting, plasticizing, blowing, cooling, setting, traction, corona, coating, impregnation, drying, welding, cutting, code spraying, folding.

7. The preparation method of the coated polyethylene anti-pesticide dust-proof high-thermal-insulation long-acting flow-droplet-eliminating mist-removing shed film according to claim 6, characterized in that: In the five-layer co-extrusion machine, the temperature of the inner layer, the secondary inner layer, the middle layer, the secondary outer layer and the outer layer extruders is 170-210 DEG C, the die temperature is 190-215 DEG C, the oven temperature is 65-95 DEG C, and the blowing ratio is 1.5-2.5.

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