Paraffin sealing film and preparation method and application thereof

Abstract

The invention provides a paraffin sealing film as well as a preparation method and application thereof, and belongs to the field of polymer modification. The invention provides a paraffin sealing film, which is prepared from the following raw materials in parts by mass: 10 to 85 parts of polyolefin elastomer; 8 to 65 parts of liquid rubber; 8-55 parts of a plasticizer; and 0-10 parts of an auxiliary agent. According to the invention, the elastic polyolefin elastomer is used as a main component, the liquid rubber is added to adjust the processability, the flexibility, the sealing property, the adhesive property and the like of the film, and the plasticizer is added to adjust the toughness, the lubricating property, the adhesion property and the like of the film; the main components and double bonds contained in the liquid rubber can be crosslinked at high temperature under electron beam irradiation, and the obtained film material is further controlled to have higher crosslinking degree, so that the film material has higher strength, flexibility, oil resistance and chemical reagent resistance.

Description

Technical Field

[0001] This invention relates to the field of polymer modification, specifically to a paraffin sealing film, its preparation method, and its application. Background Technology

[0002] Sealing films are widely used in scientific research such as molecular biology, chemistry, and materials science. They possess high water vapor barrier properties, some oxygen and carbon dioxide permeability, and good elasticity and adhesion, effectively sealing container openings to prevent liquid or gas leakage.

[0003] As a sealing material, encapsulant films require different properties in different application scenarios, and related technologies are constantly being updated and upgraded. In the field of photovoltaic cell encapsulation, encapsulant film products based on ethylene-vinyl acetate copolymer (EVA) or polyolefin elastomer (POE) have appeared on the market, but current encapsulant films suffer from insufficient flexibility. Summary of the Invention

[0004] This invention provides a paraffin sealing film, its preparation method, and its application. The paraffin sealing film of this invention has good flexibility.

[0005] This invention provides a paraffin sealing film, comprising the following raw materials in parts by weight:

[0006]

[0007] The plasticizer includes one or more of paraffin wax, white beeswax, yellow beeswax, and polyethylene wax.

[0008] Preferably, at 190°C and a load of 2.16 kg, the melt index of the polyolefin elastomer is ≤10.0 g / 10 min;

[0009] At a tensile speed of 510 mm / min, the tensile elongation at break of the polyolefin elastomer is 350–2000%.

[0010] Preferably, the liquid rubber comprises one or more of polyisobutylene, polyisoprene, and ethylene-propylene copolymer;

[0011] The ethylene-propylene copolymer includes a binary ethylene-propylene copolymer or a terpolymer of ethylene, propylene and a third monomer;

[0012] The third monomer includes dicyclopentadiene, methylene norbornene, cyclooctene, 1,4-hexadiene, and methylene norbornene. One or more of ethyl norborneol;

[0013] The ethylene-propylene copolymer contains 25-60% propylene, 40-75% ethylene, and has a weight-average molecular weight of 5000-200000.

[0014] Preferably, the paraffin wax includes one or more of the following: 48# paraffin wax, 50# paraffin wax, 52# paraffin wax, 54# paraffin wax, 56# paraffin wax, 58# paraffin wax, 60# paraffin wax, 62# paraffin wax, 64# paraffin wax, 66# paraffin wax, 68# paraffin wax, and 70# paraffin wax.

[0015] Preferably, the mass ratio of the polyolefin elastomer, liquid rubber and plasticizer is (100-85):(100-8):(100-8).

[0016] Preferably, the additives include one or more of white mineral oil, light stabilizers, antioxidants, crosslinking agents, and initiators.

[0017] Preferably, the white mineral oil includes one or more of 10# white mineral oil, 15# white mineral oil, 26# white mineral oil, PA06 (a polyalphaolefin synthetic base oil), and alkyl naphthalene AN5 low-temperature white mineral oil;

[0018] The light stabilizer includes one or more of the following: Japanese double bond 622, BASF 292, BASF 531, BASF 770, BASF 944 and BASF 1130;

[0019] The antioxidants include one or more of BASF 1010, BASF 1076, BASF 168 and BASF 1098;

[0020] The crosslinking agent includes isopropylbenzene peroxide and / or benzoyl peroxide;

[0021] The initiator includes azobisisobutyronitrile and / or azobisisovalerate.

[0022] The present invention also provides a method for preparing the paraffin sealing film described in the above technical solution, comprising the following steps:

[0023] The raw materials for the paraffin sealing film are mixed and then melt-extruded to form a film, thus obtaining the paraffin sealing film.

[0024] Alternatively, the raw materials for the paraffin sealing film can be melted and mixed before coating to obtain the paraffin sealing film.

[0025] This invention also provides the application of the paraffin sealing film described in the above technical solution or the paraffin sealing film prepared by the preparation method described in the above technical solution in sealing laboratory containers or agricultural grafting, sealing household daily beverages, sealing cosmetic packaging bottles or waterproof and breathable packaging sealing of plants and flowers.

[0026] This invention uses an elastic polyolefin elastomer as the main component, adds liquid rubber to adjust the film's processing properties, flexibility, sealing properties, and adhesion properties, and adds plasticizers to adjust the film's toughness, lubrication properties, and adhesion properties. The double bonds contained in the main component and the liquid rubber can undergo cross-linking at high temperatures and under electron beam irradiation, further controlling the resulting film material to have a high degree of cross-linking, thereby possessing... Excellent properties including high strength, flexibility, oil resistance, and chemical resistance. performance.

[0027] Furthermore, the polyolefin elastomer, liquid rubber, and paraffin combined with white mineral oil, light stabilizer, antioxidant, lubricant, and other additives of the present invention greatly improve the tensile and sealing properties of the film material, enabling it to have high elongation, self-adhesion, flexibility, and other characteristics, while ensuring that the resulting sealing film has good water vapor barrier properties and certain oxygen and carbon dioxide permeability.

[0028] The results of the examples show that the film of the present invention has a tensile elongation at break of 400-2000%, a hardness of Shore 10-70A, and a softening temperature of 30-75°C. The film has kneading self-adhesive properties under stress and can be easily "knotted".

[0029] The present invention also relates to a method for preparing the adhesive film.

[0030] The preparation method of this invention is simple and efficient. It only requires heating and melting the raw materials, and then processing them by melt extrusion to obtain a flexible sealing film. This invention has low equipment investment, high production efficiency, simple method, and efficient preparation, which is conducive to continuous production and easy to implement in agriculture, industry, scientific research, and household fields. Attached Figure Description

[0031] Figure 1 This is a photograph of the flexible paraffin sealing film prepared in Example 1 of the present invention before stretching.

[0032] Figure 2 This is a photograph of the flexible paraffin sealing film prepared in Example 1 of the present invention after being stretched by 500%. Detailed Implementation

[0033] This invention provides a paraffin sealing film, comprising the following raw materials in parts by weight:

[0034]

[0035] The plasticizer includes one or more of paraffin wax, white beeswax, yellow beeswax, and polyethylene wax.

[0036] The paraffin sealing film provided by this invention comprises, by weight, 10-85 parts of polyolefin elastomer, more preferably 15 parts, 20 parts, 25 parts, 30 parts, 35 parts, 40 parts, 45 parts, 50 parts, 55 parts, 60 parts, 65 parts, 70 parts, 75 parts, or 80 parts; at 190°C and a load of 2.16 kg, the melt index of the polyolefin elastomer is preferably ≤10.0 g / 10 min, more preferably 1 g / 10 min, 2 g / 10 min, 3 g / 10 min, 4 g / 10 min, 5 g / 10 min, 6 g / 10 min, 7 g / 10 min, 8 g / 10 min, or 9 g / 10 min; at a tensile speed of 510 mm / min, the tensile elongation at break of the polyolefin elastomer is preferably 350-2000%, more preferably... Choose 400%, 500%, 600%, 700%, 800%, 900%, 1000%, 1100%, 1200%. 1300％、 1400%, 1500%, 1600%, 1700%, 1800%, 1900%, or 2000%; the polyolefin elastomer is preferably composed of an ethylene-α-olefin copolymer, wherein the α-olefin preferably includes one or more of propylene, α-butene, α-hexene, and α-octene, and the monomer percentage of the α-olefin is not less than 20%;

[0037] In this invention, the polyolefin elastomer preferably includes one or more of ethylene-propylene copolymer, ethylene-butene copolymer, ethylene-hexene copolymer, and ethylene-octene copolymer. In this invention, the ethylene-propylene copolymer preferably includes one or more of the following: Dow Chemical's VERSIFY 3300, Dow Chemical's ENR 6386, ExxonMobil's VISTAMAXX 3000, ExxonMobil's VISTAMAXX 3020, ExxonMobil's VISTAMAXX 3030, ExxonMobil's VISTAMAXX 3060, ExxonMobil's VISTAMAXX 6102, ExxonMobil's VISTAMAXX 6202, and ExxonMobil's VISTAMAXX 8880; the ethylene-butene copolymer preferably includes one or more of the following: Dow Chemical's ENGAGE 7387, Dow Chemical's ENGAGE 7380, Dow Chemical's ENGAGE 7447, ENGAGE 7467, and Dow Chemical's ENGAGE 7487; the ethylene-octene copolymer preferably includes Dow Chemical's ENGAGE 8003 and Dow Chemical's ENGAGE 8003. One or more of the following: 8107, Dow Chemical's ENGAGE 8150, ENGAGE 8157, ENGAGE 8200, ENGAGE 8180, ENGAGE 8452, ENGAGE 8842, ExxonMobil's EXACT 5101, EXACT 5171, EXACT 5371, EXACT 8201, EXACT 8203, EXACT 8233, LG Corporation's LC100, LC170, LC180, LC565, LC670, and LC175.

[0038] In this invention, the polyolefin elastomer preferably further includes a graft-modified polyolefin elastomer. The graft-modified polyolefin elastomer preferably includes one or more of the following: POE-g-MAH grafted with maleic anhydride, POE-g-GMA grafted with glycidyl methacrylate, and POE-g-AA grafted with acrylic acid. The grafting rate of the graft-modified polyolefin elastomer is preferably 0.3-2.0%, more preferably 0.5%, 0.8%, 1%, 1.2%, 1.5%, or 1.8%. The graft-modified polyolefin elastomer preferably includes Dow FUSABOND N416, Dow FUSABOND N493, Dow FUSABOND N525, Dow FUSABOND N598, Dow FUSABOND N216, Ningbo Nengzhiguang New Material Technology Co., Ltd.'s N413, ExxonMobil VA1803, and ExxonMobil VA1840. One or more of the following.

[0039] Based on the unit mass parts of the polyolefin elastomer, the raw material of the paraffin sealing film provided by the present invention includes 8 to 65 parts of liquid rubber, more preferably 8, 10, 12, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, or 65 parts; the liquid rubber includes one or more of polyisobutylene, polyisoprene, and ethylene-propylene copolymer.

[0040] In this invention, the weight-average molecular weight of the polyisobutylene is preferably 5,000 to 200,000, more preferably 10,000, 30,000, 50,000, 80,000, 100,000, 120,000, 150,000, or 180,000; the polyisobutylene preferably includes BASF Oppanol B10N, BASF Oppanol B12N, BASF Oppanol B15N, BASF Oppanol B30, BASF Oppanol B50, BASF Oppanol B80, BASF Oppanol N30, BASF Oppanol N50, BASF Oppanol N100, HRD450 from Shandong Zhantu New Materials Technology Co., Ltd., and HRD5 from Shandong Zhantu New Materials Technology Co., Ltd. 00. One or more of the following: HRD550, HRD600, HRD650, HRD700, HRD750, HRD800, HRD850, HRD900, and HRD950 from Shandong Zhantu New Material Technology Co., Ltd., China; PB950, PB1300, and PB2400 from Daelim, South Korea; Polyisobutylene is generally a monoolefin with a single double bond, copolymerized mainly from isobutylene and a small amount of n-butene. The ethylene-propylene copolymer is preferably a binary ethylene-propylene copolymer or a terpolymer of ethylene, propylene and a third monomer; the third monomer preferably includes one or more of dicyclopentadiene, methylene norbornene, cyclooctene, 1,4-hexadiene and ethylidene norbornene; the ethylene-propylene copolymer preferably includes one or more of ethylene-propylene binary copolymer, ethylene-propylene and ethylene-propylene terpolymer with ethylene-propylene and ethylene-propylene norbornene (ENB) or dicyclopentadiene (DCPD).

[0041] The propylene content of the ethylene-propylene copolymer is preferably 25-60%, more preferably 30%, 35%, 40%, 45%, 50%, or 55%, and the ethylene content is preferably 40-75%, more preferably 45%, 50%, 55%, 60%, 65%, or 70%. The weight-average molecular weight is preferably 5000-200000, more preferably 10000, 30000, 50000, 80000, 100000, 120000, 150000, or 180000. The ethylene-propylene copolymer preferably includes Trilene CP80, Trilene CP1100, Trilene 65, Trilene 67, Trilene 77, and those from Dongguan Shenghao Plastic Raw Materials Co., Ltd. One or more of the EPDM rubbers produced by the company.

[0042] In this invention, the weight-average molecular weight of the polyisoprene is 20,000 to 100,000, more preferably 30,000, 40,000, 50,000, 60,000, 70,000, 80,000, 90,000, or 100,000. The polyisoprene includes one or more of LIR-30K and LIR-50K from Shenzhen Masni Elastomer Co., Ltd., China; LIR-908 from Kaiming Plastics (Dongguan) Co., Ltd., China; and LIR-30, LIR-200, LIR-290, LIR-310, and LIR-403 from Kuraray, Japan. The polyisoprene belongs to the conjugated diene rubber class and is a polyolefin having one double bond.

[0043] The paraffin sealing film provided by this invention comprises 8 to 55 parts by weight of paraffin wax, more preferably 8, 10, 15, 20, 25, 30, 35, 40, 45, 50, or 55 parts; the paraffin wax preferably includes one or more of the following: 48# paraffin wax, 50# paraffin wax, 52# paraffin wax, 54# paraffin wax, 56# paraffin wax, 58# paraffin wax, 60# paraffin wax, 62# paraffin wax, 64# paraffin wax, 66# paraffin wax, 68# paraffin wax, 70# paraffin wax, white beeswax, yellow beeswax (yellow or deyellown white), and polyethylene wax; the paraffin wax is preferably from the brand China Nanhai, Kunlun, or Sinopec. Paraffin wax can adjust the processing properties, tensile properties, and self-adhesive properties of the film.

[0044] In this invention, the preferred mass ratio of the polyolefin elastomer, liquid rubber and plasticizer is (100-85):(100-8):(100-8), and a more preferred ratio is (100-85):(100-70):(100-50).

[0045] The raw materials of the paraffin sealing film provided by the present invention include 0 to 10 parts by weight of additives, more preferably 0 parts, 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts or 9 parts; the additives preferably include one or more of white mineral oil, light stabilizer, antioxidant, lubricant, crosslinking agent and initiator.

[0046] In this invention, the white mineral oil preferably includes one or more of 10# white mineral oil, 15# white mineral oil, 26# white mineral oil, PA06 (a polyalphaolefin synthetic base oil), and alkyl naphthalene AN5 low-temperature white mineral oil. White mineral oil can improve the plasticizing effect of films.

[0047] In this invention, the light stabilizer preferably includes one or more of the following: Japanese double bond 622, BASF 292, BASF 531, BASF 770, BASF 944 and BASF 1130.

[0048] In this invention, the antioxidant preferably includes one or more of hindered phenolic antioxidants, aromatic amine antioxidants and thioester antioxidants, more preferably one or more of BASF 1010, BASF 1076, BASF 168 and BASF 1098; the addition of antioxidants can prevent oxygen from oxidizing the polyolefin copolymer and avoid discoloration and oxidative aging.

[0049] In this invention, the crosslinking agent preferably includes isopropylbenzene peroxide and / or benzoyl peroxide.

[0050] In this invention, the initiator preferably includes azobisisobutyronitrile and / or azobisisovalerate.

[0051] In this invention, the lubricant comprises silicone powder and / or silicone masterbatch.

[0052] In this invention, the thickness of the paraffin sealing film is preferably 50-1000 micrometers, more preferably 80 micrometers, 90 micrometers, 100 micrometers, 110 micrometers, 120 micrometers, 130 micrometers, 140 micrometers, 150 micrometers, 160 micrometers, 170 micrometers, 180 micrometers, 190 micrometers, 200 micrometers, 300 micrometers, 400 micrometers, 500 micrometers, 600 micrometers, 700 micrometers, 800 micrometers or 900 micrometers, and the Shore hardness is preferably 10-70A, more preferably 20A, 30A, 40A, 50A, 60A or 70A.

[0053] The paraffin sealing film of the present invention has a certain degree of transparency, and becomes more transparent as it is stretched within a certain range. It can be used as a daily sealing film and a semi-visible sealing film. In addition, the paraffin sealing film of the present invention also has low tensile strength, excellent elongation at break, and good self-adhesion, and has packaging, sealing and sealing functions.

[0054] The present invention also provides a method for preparing the paraffin sealing film described in the above technical solution, comprising the following steps:

[0055] The raw materials for the paraffin sealing film are mixed and then melt-extruded to form a film, thus obtaining the paraffin sealing film.

[0056] Alternatively, the raw materials for the paraffin sealing film can be melted and mixed before coating to obtain the paraffin sealing film.

[0057] The present invention involves melting and mixing the raw materials of the paraffin sealing film and then coating them to obtain the paraffin sealing film.

[0058] In this invention, the coating process preferably includes: conveying the molten mixture obtained by melting and mixing to a slot coating die head via a gear pump, then bonding it to the substrate, pressing rollers, stretching, cooling, winding, and post-processing.

[0059] In this invention, the melting and mixing temperature is preferably 160-180°C, the temperature of the hot melt adhesive cavity used for coating is preferably 200-210°C, the temperature of the gear pump connecting the hot melt adhesive cavity and the heat preservation pipe of the coating head is preferably 190-200°C, and the temperature of the upper and lower double-sided mold temperature of the coating head is preferably 190°C.

[0060] The present invention involves mixing the raw materials of the paraffin sealing film, then melting and extruding them to form a film, thereby obtaining the paraffin sealing film.

[0061] In this invention, the melt extrusion is preferably carried out in a single-screw extruder or a twin-screw extruder;

[0062] In this invention, the screw speed during the screw melt extrusion is preferably 50 to 400 rpm, and the main feed rate is preferably 50 to 400 m / s.

[0063] In this invention, the film formation preferably includes casting the melt-extruded mixture onto a substrate, followed by pressing, stretching, cooling, winding, and post-treatment.

[0064] The present invention preferably obtains sealing film products in rolls of different widths by slitting. Therefore, the preparation method of the present invention can obtain continuous sealing film roll products.

[0065] In this invention, the preferred temperature for mixing the raw materials of the paraffin sealing film is 70-200°C, and the preferred stirring speed is 5-200 rpm.

[0066] In this invention, the temperature of the extrusion head is preferably 70℃~200℃; the temperature of the extrusion head is preferably 70℃~200℃;The extrusion process preferably includes three heating sections: from the tail to the head. The heating temperature of the first section is preferably 20-160℃, the heating temperature of the second section is preferably 80-170℃, and the heating temperature of the third section is preferably 90-200℃. The screw speed during melt extrusion is preferably 60-150 rpm.

[0067] The preparation method of the present invention is simple and efficient. It only requires mixing and heating the raw materials, and then processing them by coating or screw melt plasticizing extrusion and film casting to prepare a flexible paraffin sealing film. The equipment investment is low, the production efficiency is high, and it is conducive to continuous production and industrial application.

[0068] This invention also provides the application of the paraffin sealing film described in the above technical solution or the paraffin sealing film prepared by the preparation method described in the above technical solution in sealing laboratory containers, agricultural grafting sealing, household daily beverage sealing, cosmetic packaging bottle sealing, or waterproof and breathable packaging sealing of plants and flowers.

[0069] The following detailed description, in conjunction with embodiments, illustrates the paraffin sealing film, its preparation method, and its applications provided by the present invention. However, these descriptions should not be construed as limiting the scope of protection of the present invention.

[0070] Example 1

[0071] A flexible paraffin sealing film, wherein the raw materials of the paraffin sealing film are composed of the following components in parts by weight:

[0072] 40 parts of polyethylene-propylene copolymer (POE) selected from Dow Chemical's VERSIFY 3300;

[0073] 35 parts of ethylene-propylene copolymer, selected from Trilene CP80 by Lion Chemicals, USA;

[0074] 25 parts of 64# fully refined paraffin wax, selected from Sinopec 64# paraffin wax.

[0075] A method for preparing a flexible paraffin sealing film, comprising the following steps:

[0076] According to the flexible paraffin sealing film provided in Example 1, the raw materials are thoroughly stirred and melted, and stirred evenly. The heating temperature is 160°C, and the resulting melt is the first mixture.

[0077] The first mixture is slit-extruded and coated onto a substrate, then laminated, stretched, cooled, wound, and post-treated to obtain a flexible paraffin sealing film.

[0078] The step of heating, melting, and stirring the raw material mixture involves: using a double-layered heated reactor with heat transfer oil circulating in the stainless steel double-layered jacket, setting the temperature to 160℃, heating and melting the raw material mixture, and stirring it evenly to obtain a melt, which is the first mixture; the step of performing slit extrusion coating on the first mixture to obtain the extrudate involves: using a gear pump, metering pump, and insulation pipe to transport the melt to the slit coating head, with the melt delivery rate precisely controlled by the gear pump speed. The melt is extruded through the slit of the coating head onto the substrate, and the thickness of the coated film is simultaneously controlled by controlling the substrate's stretching speed and the extrusion rate of the hot melt adhesive pump. The heating temperature of the hot melt adhesive chamber... The temperature of the insulation pipe connecting the hot melt adhesive chamber gear pump and the coating head is set to 210℃, and 200℃. The heating temperature of the upper and lower molds on the coating head is set to 190℃.

[0079] Example 2

[0080] A flexible paraffin sealing film, wherein the raw materials of the paraffin sealing film are composed of the following components in parts by weight:

[0081] 20 parts of polyethylene-propylene copolymer (POE) and 20 parts of polyethylene-octene copolymer (POE) were selected from Dow Chemical's VERSIFY 3300 and ENGAGE 8842, respectively.

[0082] 20 parts of polyisobutylene, selected from Shandong Zhantu HRD950 in China;

[0083] 40 portions of 64# fully refined paraffin wax, selected from Kunlun brand 64# paraffin wax from Dalian, China.

[0084] A method for preparing a flexible paraffin sealing film, comprising the following steps:

[0085] According to the flexible paraffin sealing film provided in Example 2, the raw materials are thoroughly stirred and melted, and stirred evenly. The heating temperature is 180°C, and the resulting melt is the first mixture.

[0086] The first mixture is melt-extruded using a single screw extruder. The extrudate is then coated and cast into a film, followed by lamination, pressure rolling, stretching, cooling, winding, and post-treatment to obtain a flexible paraffin sealing film. The step of heating, melting, and stirring the raw material mixture involves using a double-layer heated reactor with heat-conducting oil circulating in a stainless steel double-layer jacket at a temperature of 180°C. The raw material mixture is heated, melted, and stirred evenly to obtain the first mixture. The step of extruding, casting, and coating the first mixture to obtain the extrudate involves using a single screw extruder with a metering pump to precisely control the melt addition rate. The die head heating temperature is 120°C, the screw speed is 60 rpm, the first heating temperature is 25°C, the second heating temperature is 100°C, and the third heating temperature is 110°C.

[0087] Example 3

[0088] A flexible paraffin sealing film, wherein the raw materials of the paraffin sealing film are composed of the following components in parts by weight:

[0089] 30 parts of polyethylene-octene copolymer (POE) were blended into two types of POE, each consisting of 15 parts and 15 parts, selected from Dow Chemical's ENGAGE 8150 and ENGAGE 8200, respectively.

[0090] 39 parts of ethylene-propylene copolymer, selected from Lion Chemicals' CP80;

[0091] 30 parts of fully refined paraffin wax No. 48, selected from Kunlun brand No. 48 paraffin wax from Dalian, China;

[0092] One part of 26# white mineral oil, selected from 26# white mineral oil of Dongguan Shanyi Plastic Chemical Co., Ltd., China.

[0093] A method for preparing a flexible paraffin sealing film, comprising the following steps:

[0094] According to the flexible paraffin sealing film provided in Example 3, the raw materials are thoroughly stirred and heated to melt and stirred evenly. The heating temperature is 160°C, and the resulting melt is the first mixture.

[0095] The first mixture is subjected to screw melt extrusion, and the extrudate is subjected to casting and coating film formation treatment, and then... Linear compound The process involves lamination, pressure rolling, stretching, cooling, winding, and post-treatment to obtain a flexible paraffin sealing film.The process of heating, melting, and stirring the raw material mixture is as follows: a double-layer heated reactor is used, with heat transfer oil circulating in the stainless steel double-layer jacket. The temperature is set at 160℃ to heat, melt, and stir the raw material mixture evenly, resulting in a first mixture. The process of extruding, casting, and coating the first mixture to obtain an extrudate is as follows: a twin-screw extruder is used, with a metering pump precisely controlling the melt addition rate for melt extrusion. The die head heating temperature is 120℃, the screw speed is 100 rpm, the first heating temperature is 120℃, the second heating temperature is 130℃, and the third heating temperature is 135℃.

[0096] Example 4

[0097] A flexible paraffin sealing film, wherein the raw materials of the paraffin sealing film are composed of the following components in parts by weight:

[0098] 42 parts of polyethylene-octene copolymer (POE) were blended into two types of POE: 20 parts and 22 parts, selected from Dow Chemical's ENGAGE 8150 and ENGAGE 8842, respectively.

[0099] 30 parts of ethylene-propylene copolymer, selected from Lion Chemical's Trilene 67;

[0100] 25 parts of fully refined paraffin wax No. 58, selected from Kunlun brand No. 58 paraffin wax from Dalian, China;

[0101] One part of 26# white mineral oil, selected from 26# white mineral oil of Dongguan Shanyi Plastic Chemical Co., Ltd., China;

[0102] One part of light stabilizer, selected from double bond Chisorb 622;

[0103] One part of antioxidant, selected from BASF1076.

[0104] A method for preparing a flexible paraffin sealing film, comprising the following steps:

[0105] According to the flexible paraffin sealing film provided in Example 4, the raw materials are thoroughly stirred and melted, and stirred evenly. The heating temperature is 170°C, and the resulting melt is the first mixture.

[0106] The first mixture is melt-extruded using a screw extruder. The extrudate is then coated and cast into a film, followed by lamination, pressing, stretching, cooling, winding, and post-treatment to obtain a flexible paraffin sealing film. The step of heating, melting, and stirring the raw material mixture involves using a double-layered heated reactor with heat-conducting oil circulating in a stainless steel double-layered jacket at a temperature of 170°C. The mixture is heated, melted, and stirred uniformly to obtain the first mixture. The step of extruding, casting, and coating the first mixture to obtain the extrudate involves using a twin-screw extruder with a metering pump precisely controlling the melt feed rate for melt extrusion. The die head heating temperature is 130°C, the screw speed is 80 rpm, the first heating temperature is 130°C, the second heating temperature is 135°C, and the third heating temperature is 145°C.

[0107] Example 5

[0108] A flexible paraffin sealing film, wherein the raw materials of the paraffin sealing film are composed of the following components in parts by weight:

[0109] 53 parts of polyolefin elastomer (POE) were blended into two types of POE: 23 parts and 30 parts, respectively, selected from ceramics. ENGAGE8842 and VERSIFY 3300 from the company's chemical division.

[0110] Eight parts of polyisobutylene were selected from PB2400 of Daelim, South Korea.

[0111] 34 portions of fully refined paraffin wax No. 48, selected from Kunlun brand No. 48 paraffin wax from Dalian, China.

[0112] Five parts of 26# white mineral oil, selected from 26# white mineral oil of Dongguan Shanyi Plastic Chemical Co., Ltd., China.

[0113] A method for preparing a flexible paraffin sealing film, comprising the following steps:

[0114] According to the flexible paraffin sealing film provided in Example 5, the raw materials are thoroughly stirred and melted, and stirred evenly. The heating temperature is 160°C, and the resulting melt is the first mixture.

[0115] The first mixture is slit-extruded and coated onto a substrate, then laminated, stretched, cooled, wound, and post-treated to obtain a flexible paraffin sealing film.

[0116] The step of heating, melting, and stirring the raw material mixture is as follows: a double-layer heated reactor is used, with heat transfer oil circulating in the stainless steel double-layer jacket. The temperature is set to 180℃ to heat, melt, and stir the raw material mixture evenly, resulting in a first mixture. The step of slit extrusion coating the first mixture to obtain the extrudate is as follows: a gear pump, metering pump, and insulation pipe are used to transport the melt to the slit coating head. The melt delivery rate is precisely controlled by the gear pump speed. The melt is extruded through the slit of the coating head onto the substrate. The thickness of the coating film is simultaneously controlled by controlling the substrate's stretching speed and the extrusion rate of the hot melt adhesive pump. The heating temperature of the hot melt adhesive chamber is set to 200℃, the temperature of the insulation pipe connecting the gear pump of the hot melt adhesive chamber to the coating head is set to 190℃, and the heating temperature of the upper and lower double-sided molds of the coating head is set to 190℃.

[0117] Example 6

[0118] A flexible paraffin sealing film, wherein the raw materials of the paraffin sealing film are composed of the following components in parts by weight:

[0119] 28 parts of polyethylene-propylene copolymer (POE) were selected from Dow Chemical's VERSIFY 3300.

[0120] 62 parts of ethylene-propylene copolymer, selected from Lion Chemical CP80.

[0121] 10 parts of 70# fully refined paraffin wax, selected from Sinopec 70# paraffin wax.

[0122] A method for preparing a flexible paraffin sealing film, comprising the following steps:

[0123] According to the flexible paraffin sealing film provided in Example 6, the raw materials are thoroughly stirred and melted, and stirred evenly. The heating temperature is 180°C, and the resulting melt is the first mixture.

[0124] The first mixture is melt-extruded using a twin-screw extruder. The extrudate is then coated and cast into a film, followed by lamination, roller pressing, stretching, cooling, winding, and post-treatment to obtain a flexible paraffin sealing film. The step of heating, melting, and stirring the raw material mixture involves using a double-layer heated reactor. Heat transfer oil is circulated in a stainless steel double-layer jacket. Circulating flow, set at a temperature of 180℃, for the raw material mixture The process involves heating and melting the mixture, stirring it evenly, to obtain a first mixture. The first mixture is then subjected to extrusion casting and film coating to obtain an extrudate. The process involves using a twin-screw extruder and a metering pump to precisely control the melt addition rate for melt extrusion. The die head heating temperature is 130°C, the screw speed is 80 rpm, the first heating temperature is 25°C, the second heating temperature is 110°C, and the third heating temperature is 120°C.

[0125] Example 7

[0126] A flexible paraffin sealing film, wherein the raw materials of the paraffin sealing film are composed of the following components in parts by weight:

[0127] 35 parts of polyethylene-butene copolymer (POE) were selected from Dow Chemical's ENGAGE 7447.

[0128] 28 parts of ethylene-propylene copolymer, selected from Lion Chemical's CP80.

[0129] 33 portions of white and yellow beeswax were selected from beeswax (white) from Hebei Xushi Beeswax Co., Ltd.

[0130] Four parts of 26# white mineral oil, selected from 26# white mineral oil of Dongguan Shanyi Plastic Chemical Co., Ltd., China.

[0131] A method for preparing a flexible paraffin sealing film, comprising the following steps:

[0132] According to the flexible paraffin sealing film provided in Example 7, the raw materials are thoroughly stirred and melted, and stirred evenly. The heating temperature is 190°C, and the resulting melt is the first mixture.

[0133] The first mixture is melt-extruded using a single screw extruder. The extrudate is then coated and cast into a film, followed by lamination, pressure rolling, stretching, cooling, winding, and post-treatment to obtain a flexible paraffin sealing film. The step of heating, melting, and stirring the raw material mixture involves using a double-layer heated reactor with heat-conducting oil circulating in a stainless steel double-layer jacket at a temperature of 190°C. The raw material mixture is heated, melted, and stirred evenly to obtain the first mixture. The step of extruding, casting, and coating the first mixture to obtain the extrudate involves using a single screw extruder with a metering pump to precisely control the melt addition rate for melt extrusion. The die head heating temperature is 120°C, the screw speed is 120 rpm, the first heating temperature is 100°C, the second heating temperature is 120°C, and the third heating temperature is 130°C.

[0134] Example 8

[0135] A flexible paraffin sealing film, wherein the raw materials of the paraffin sealing film are composed of the following components in parts by weight:

[0136] 38 parts of polyolefin elastomer (POE) were blended into two types of POE: 13 parts and 25 parts, selected from ExxonMobil EXACT 5171 and Dow Chemical ENGAGE 7447, respectively.

[0137] 25 parts of liquid polyisoprene were selected from LIR-50K of Shenzhen Masni Elastomer Co., Ltd.

[0138] 34 portions of white beeswax were selected from sun-bleached white beeswax produced by Henghong Beeswax Industry Co., Ltd. of Dongguang County, China.

[0139] Three parts of 26# white mineral oil, selected from 26# white mineral oil of Dongguan Shanyi Plastic Chemical Co., Ltd., China.

[0140] A method for preparing a flexible paraffin sealing film, comprising the following steps:

[0141] According to the flexible paraffin sealing film provided in Example 8, the raw materials are thoroughly stirred and heated to melt and stirred evenly. The heating temperature is 190°C, and the resulting melt is the first mixture.

[0142] The first mixture is melt-extruded using a single screw extruder. The extrudate is then coated and cast into a film, followed by lamination, pressure rolling, stretching, cooling, winding, and post-treatment to obtain a flexible paraffin sealing film. The step of heating, melting, and stirring the raw material mixture involves using a double-layer heated reactor with heat-conducting oil circulating in a stainless steel double-layer jacket at a temperature of 190°C. The raw material mixture is heated, melted, and stirred evenly to obtain the first mixture. The step of extruding, casting, and coating the first mixture to obtain the extrudate involves using a single screw extruder with a metering pump to precisely control the melt addition rate. The die head heating temperature is 120°C, the screw speed is 150 rpm, the first heating temperature is 40°C, the second heating temperature is 100°C, and the third heating temperature is 110°C.

[0143] Example 9

[0144] A flexible paraffin sealing film, wherein the raw materials of the paraffin sealing film are composed of the following components in parts by weight:

[0145] 37.4 parts of polyolefin elastomer (POE) were blended into two types of POE blends: 12.4 parts and 25 parts, selected from ExxonMobil EXACT 5171 and Dow Chemical ENGAGE 7447, respectively.

[0146] 25 parts of liquid polyisoprene were selected from LIR-50K of Shenzhen Masni Elastomer Co., Ltd.

[0147] 34 portions of white beeswax were selected from sun-bleached white beeswax produced by Henghong Beeswax Industry Co., Ltd. of Dongguang County, China.

[0148] Three parts of 26# white mineral oil, selected from 26# white mineral oil of Dongguan Shanyi Plastic Chemical Co., Ltd., China.

[0149] 0.2 parts of light stabilizer, selected from double bond Chisorb 622.

[0150] 0.2 parts of antioxidant, selected from BASF1076.

[0151] 0.2 parts of lubricant, selected from silicone masterbatch ZH-ID from Dongguan Zhonghui Plastic Additives Co., Ltd.

[0152] A method for preparing a flexible paraffin sealing film, comprising the following steps:

[0153] According to the flexible paraffin sealing film provided in Example 9, the raw materials are thoroughly stirred and uniformly mixed, heated to melt and stirred uniformly, and the heating temperature is 190°C. The resulting melt is the first mixture.

[0154] The first mixture is melt-extruded using a single screw extruder. The extrudate is then coated and cast into a film, followed by lamination, pressure rolling, stretching, cooling, winding, and post-treatment to obtain a flexible paraffin sealing film. The step of heating, melting, and stirring the raw material mixture involves using a double-layer heated reactor with heat-conducting oil circulating in a stainless steel double-layer jacket at a temperature of 190°C. The raw material mixture is heated, melted, and stirred uniformly to obtain the first mixture. The step of extruding, casting, and coating the first mixture to obtain the extrudate involves using a single screw extruder with precise control using a metering pump. The melt addition rate is controlled, and melt extrusion is performed. The die head heating temperature is 110℃. rod speed The rpm is 150 rpm, the first heating temperature is 40℃, the second heating temperature is 100℃, and the third heating temperature is 110℃.

[0155] Comparative Example 1

[0156] A thin film, wherein the raw materials of the thin film are composed of the following components in parts by weight:

[0157] Eight parts of polyethylene-octene copolymer (POE) were selected from Dow Chemical's ENGAGE 8150.

[0158] 40 parts of linear low-density polyethylene and 48 parts of metallocene-catalyzed linear low-density polyethylene mLLDPE were selected from Zhejiang Petrochemical LLDPE 7042 and Prima SP1520, respectively.

[0159] Two parts of 26# white mineral oil, selected from 26# white mineral oil from Dongguan Shanyi Plastic Chemical Co., Ltd., China;

[0160] One part of light stabilizer, selected from double bond Chisorb 622;

[0161] One part of antioxidant, selected from BASF1076.

[0162] A method for preparing a thin film, comprising the following steps:

[0163] The raw materials provided according to the film provided in Comparative Example 1 were thoroughly stirred and melted, and stirred evenly. The heating temperature was 190°C, and the resulting melt was the first mixture.

[0164] The first mixture is heated, melted, and extruded. The extrudate is then subjected to casting and film-forming treatment, followed by lamination, pressing, stretching, cooling, winding, and post-treatment to obtain a film. The step of heating, melting, and stirring the raw material mixture involves using a double-layered heated reactor with heat-conducting oil circulating in a stainless steel double-layered jacket at a temperature of 190°C. The raw material mixture is heated, melted, and stirred uniformly to obtain the first mixture. The step of extruding, casting, and film-forming the first mixture to obtain the extrudate involves using a twin-screw extruder with a metering pump precisely controlling the melt addition rate for melt extrusion. The die head heating temperature is 200°C, the screw speed is 200 rpm, the first heating temperature is 200°C, the second heating temperature is 210°C, and the third heating temperature is 225°C.

[0165] Comparative Example 2

[0166] A thin film, wherein the raw materials of the thin film are composed of the following components in parts by weight:

[0167] 40 parts of polyethylene-butene copolymer (POE) were selected from Dow Chemical's ENGAGE 7447.

[0168] 28 parts of solid EPDM rubber particles were selected from S552-1 of SK Corporation, South Korea.

[0169] 32 parts of 58# fully refined paraffin wax, selected from Sinopec 58# paraffin wax.

[0170] A method for preparing a thin film, comprising the following steps:

[0171] According to the raw materials provided for the film provided in Comparative Example 2, the raw materials are thoroughly stirred and melted, and stirred evenly. The heating temperature is 190°C, and the resulting melt is the first mixture.

[0172] The first mixture was melt-extruded using a single screw extruder, and the extrudate was subjected to a coating and casting process to form a film. Perform recovery The process involves bonding, pressing, stretching, cooling, winding, and post-treatment to obtain a flexible paraffin sealing film.The step of heating, melting, and stirring the raw material mixture is as follows: a double-layer heating reactor is used, and heat transfer oil is circulated in the stainless steel double-layer jacket. The temperature is set at 190℃ to heat, melt, and stir the raw material mixture evenly. The resulting melt is the first mixture. The step of extruding, casting, and coating the first mixture to obtain the extrudate is as follows: a single-screw extruder is used, and the melt addition rate is precisely controlled by a metering pump to perform melt extrusion. The die head heating temperature is 120℃, the screw speed is 150rpm, the first heating temperature is 40℃, the second heating temperature is 100℃, and the third heating temperature is 110℃.

[0173] Comparative Example 3

[0174] A thin film, wherein the raw materials of the thin film are composed of the following components in parts by weight:

[0175] 45 parts of polyethylene-octene copolymer (POE) were selected from Dow Chemical's ENGAGE 8150.

[0176] 45 parts of ethylene-propylene copolymer, selected from Lion Chemical's CP80.

[0177] 10 parts of 26# white mineral oil, selected from 26# white mineral oil of Dongguan Shanyi Plastic Chemical Co., Ltd., China.

[0178] A method for preparing a thin film, comprising the following steps:

[0179] The raw materials provided according to the film provided in Comparative Example 3 were thoroughly stirred and melted, and stirred evenly. The heating temperature was 170°C, and the resulting melt was the first mixture.

[0180] The first mixture is slit-extruded and coated onto a substrate, then laminated, stretched, cooled, wound, and post-treated to obtain a flexible paraffin sealing film.

[0181] The steps for heating, melting, and stirring the raw material mixture are as follows: A double-layer heated reactor is used, with heat transfer oil circulating in the stainless steel double-layer jacket. The temperature is set at 170℃ to heat, melt, and stir the raw material mixture evenly, resulting in a first mixture. The steps for slit extrusion coating of the first mixture to obtain the extrudate are as follows: A gear pump, metering pump, and insulation pipe are used to transport the melt to the slit coating head. The melt delivery rate is precisely controlled by the gear pump speed. The melt is extruded through the slit of the coating head and coated onto the substrate. The thickness of the coated film is simultaneously controlled by controlling the substrate's stretching speed and the extrusion rate of the hot melt adhesive pump. The heating temperature of the hot melt adhesive chamber is set to 200℃, the temperature of the insulation pipe connecting the gear pump to the coating head is set to 190℃, and the heating temperature of the upper and lower double-sided molds of the coating head is set to 200℃.

[0182] Comparative Example 4

[0183] A thin film, wherein the raw materials of the thin film are composed of the following components in parts by weight:

[0184] 22 parts of polyethylene-octene copolymer (POE) were selected from ExxonMobil EXACT 5371.

[0185] 22 parts of polyisobutylene were selected from HRD650 of Shandong Zhantu, China.

[0186] 56 portions of 48# fully refined paraffin wax, selected from Sinopec's 48# paraffin wax.

[0187] A method for preparing a thin film, comprising the following steps:

[0188] The raw materials provided according to the film provided in Comparative Example 4 were thoroughly stirred and melted, and stirred evenly. The heating temperature was 170°C, and the resulting melt was the first mixture.

[0189] The first mixture is melt-extruded using a single screw extruder. The extrudate is then coated and cast into a film, followed by lamination, pressure rolling, stretching, cooling, winding, and post-treatment to obtain a flexible paraffin sealing film. The step of heating, melting, and stirring the raw material mixture involves using a double-layer heated reactor with heat-conducting oil circulating in a stainless steel double-layer jacket at a temperature of 170°C. The raw material mixture is heated, melted, and stirred evenly to obtain the first mixture. The step of extruding, casting, and coating the first mixture to obtain the extrudate involves using a single screw extruder with a metering pump to precisely control the melt addition rate. The die head heating temperature is 120°C, the screw speed is 150 rpm, the first heating temperature is 30°C, the second heating temperature is 100°C, and the third heating temperature is 110°C.

[0190] Comparative Example 5

[0191] A thin film, wherein the raw materials of the thin film are composed of the following components in parts by weight:

[0192] 86 parts of polyethylene-butene copolymer (POE) were selected from Dow Chemical's ENGAGE 7467.

[0193] Seven parts of polyisoprene were selected from LIR-50K of Shenzhen Masni Elastomer Co., Ltd., China.

[0194] Seven portions of 58# fully refined paraffin wax, selected from Sinopec's 58# paraffin wax.

[0195] A method for preparing a thin film, comprising the following steps:

[0196] The raw materials provided according to the film provided in Comparative Example 5 were thoroughly stirred and melted, and stirred evenly. The heating temperature was 180°C, and the resulting melt was the first mixture.

[0197] The first mixture is melt-extruded using a single screw extruder. The extrudate is then coated and cast into a film, followed by lamination, pressure rolling, stretching, cooling, winding, and post-treatment to obtain a flexible paraffin sealing film. The step of heating, melting, and stirring the raw material mixture involves using a double-layer heated reactor with heat-conducting oil circulating in a stainless steel double-layer jacket at a temperature of 180°C. The raw material mixture is heated, melted, and stirred evenly to obtain the first mixture. The step of extruding, casting, and coating the first mixture to obtain the extrudate involves using a single screw extruder with a metering pump to precisely control the melt addition rate for melt extrusion. The die head heating temperature is 130°C, the screw speed is 120 rpm, the first heating temperature is 40°C, the second heating temperature is 120°C, and the third heating temperature is 130°C.

[0198] Property Testing and Result Analysis

[0199] The performance of the flexible paraffin sealing films of Examples 1-9 and the films of Comparative Examples 1-5 was tested, and the results were... See table 1；

[0200] Table 1. Performance test results of the flexible paraffin sealing films of Examples 1-9 and the films of Comparative Examples 1-5.

[0201]

[0202] As shown in Table 1, the flexible paraffin sealing films obtained in Examples 1-9 have the same thickness as the films obtained in Comparative Examples 1-5, but their maximum elongation at break differs. The maximum longitudinal elongation of the flexible paraffin sealing films obtained in Examples 1-9 is 750%, 850%, 700%, 900%, 700%, 650%, 1000%, 1100%, and 1100%, respectively; the maximum transverse elongation is 700%, 800%, 650%, 800%, 650%, 600%, 900%, 950%, and 900%, respectively. The maximum longitudinal and transverse elongation of the film obtained in Comparative Example 1 is 250% and 200%, respectively, and the longitudinal and transverse elongation of the films obtained in Comparative Examples 2-5 are also lower than those in Examples 1-9. Therefore, the elongation at break of the sealing film products prepared in Examples 1-9 of this invention is superior to that of Comparative Examples 1-5.

[0203] Furthermore, hardness tests revealed that the Shore A hardness values ​​of the flexible paraffin sealing films obtained in Examples 1-9 were 55A, 40A, 32A, 30A, 62A, 38A, 60A, 58A, and 58A, respectively. In contrast, the film of Comparative Example 1 had a hardness value of 72A, and the films of Comparative Examples 2-5 also had higher hardness values ​​than the flexible sealing films of Examples 1-9. Therefore, the sealing film products prepared in Examples 1-9 of this invention are softer than those in Comparative Examples 1-5. Consequently, the flexible paraffin sealing film provided by this invention has a relatively soft texture.

[0204] Furthermore, tensile testing shows that the flexible paraffin sealing film provided by this invention can be stretched to a considerable extent without breaking under relatively small tensile forces. In addition, the flexible paraffin sealing film provided by this invention can generate significant self-adhesive force when overlapped for sealing, thus facilitating its use in sealing and encapsulation.

[0205] Figure 1 This is a photograph of the flexible paraffin sealing film prepared in Example 1 of the present invention before stretching.

[0206] Figure 2 This is a photograph of the flexible paraffin sealing film prepared in Example 1 of the present invention after being stretched by 500%.

[0207] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A paraffin sealing film, characterized in that, By weight, it includes the following raw materials: The plasticizer includes one or more of paraffin wax, white beeswax, yellow beeswax, and polyethylene wax.

2. The paraffin sealing film according to claim 1, characterized in that, At 190℃ and a load of 2.16kg, the melt index of the polyolefin elastomer is ≤10.0g / 10min; At a tensile speed of 510 mm / min, the tensile elongation at break of the polyolefin elastomer is 350–2000%.

3. The paraffin sealing film according to claim 1, characterized in that, The liquid rubber includes one or more of polyisobutylene, polyisoprene, and ethylene-propylene copolymer; The ethylene-propylene copolymer includes a binary ethylene-propylene copolymer or a terpolymer of ethylene, propylene and a third monomer; The third monomer includes one or more of dicyclopentadiene, methylene norbornene, cyclooctene, 1,4-hexadiene, and ethylidene norbornene; The ethylene-propylene copolymer contains 25-60% propylene, 40-75% ethylene, and has a weight-average molecular weight of 5000-200000.

4. The paraffin sealing film according to claim 1, characterized in that, The paraffin wax includes one or more of the following: 48# paraffin wax, 50# paraffin wax, 52# paraffin wax, 54# paraffin wax, 56# paraffin wax, 58# paraffin wax, 60# paraffin wax, 62# paraffin wax, 64# paraffin wax, 66# paraffin wax, 68# paraffin wax, and 70# paraffin wax.

5. The paraffin sealing film according to claim 1, characterized in that, The mass ratio of the polyolefin elastomer, liquid rubber and plasticizer is (100-85):(100-8):(100-8).

6. The paraffin sealing film according to claim 1, characterized in that, The additives include one or more of white mineral oil, light stabilizers, antioxidants, lubricants, crosslinking agents, and initiators.

7. The paraffin sealing film according to claim 6, characterized in that, The white mineral oil includes one or more of 10# white mineral oil, 15# white mineral oil, 26# white mineral oil, PA06 (a polyalphaolefin synthetic base oil), and alkyl naphthalene AN5 low-temperature white mineral oil; The light stabilizer includes one or more of the following: Japanese double bond 622, BASF 292, BASF 531, BASF 770, BASF 944 and BASF 1130; The antioxidants include one or more of BASF 1010, BASF 1076, BASF 168 and BASF 1098; The crosslinking agent includes isopropylbenzene peroxide and / or benzoyl peroxide; The initiator includes azobisisobutyronitrile and / or azobisisovalerate.

8. A method for preparing the paraffin sealing film according to any one of claims 1 to 7, characterized in that, Includes the following steps: The raw materials for the paraffin sealing film are mixed and then melt-extruded to form a film, thus obtaining the paraffin sealing film. Alternatively, the raw materials for the paraffin sealing film can be melted and mixed before coating to obtain the paraffin sealing film.

9. The application of the paraffin sealing film according to any one of claims 1 to 7 or the paraffin sealing film prepared by the preparation method according to claim 8 in sealing laboratory containers or agricultural grafting seals, sealing household daily beverages, sealing cosmetic packaging bottles, or waterproof and breathable packaging seals for plants and flowers.

Images