High-strength, low-temperature-resistant and low-warpage bottom protective plate material and preparation method thereof

Abstract

The invention belongs to the technical field of plastic modification, and relates to a high-strength, low-temperature-resistant and low-warpage bottom protective plate material and a preparation method thereof. The method comprises the following steps: weighing the polypropylene resin particles, the flexibilizer resin particles, the compatilizer and the black masterbatch, and putting into a stirring pot; adding a wetting agent and 350RPM, and stirring; adding a processing aid bag, the treated silicon dioxide and 350RPM into the stirring pot, and stirring; adding the mixed materials into a main feeding weightlessness scale; the length-diameter ratio of the equipment is 40: 1, chopped glass fibers are added into a side feeding weightlessness scale at the sixth section of the barrel of the extruder, the blanking amount of the main weightlessness scale is set to be 35 kg / h, and the blanking amount of the side weightlessness scale is set to be 15 kg / h; and starting a main machine at the frequency of 38Hz, starting feeding, starting auxiliary equipment, and carrying out granulation production. According to the method, the dependence on native petrochemical products can be reduced by adopting the regenerated material, the carbon emission is reduced, and the prepared material simultaneously meets the requirements of high strength, low temperature resistance and low warping.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of plastic modification, and particularly relates to a high-strength, low-temperature-resistant and low-warp underbody shield material and a preparation method thereof. BACKGROUND

[0002] At present, the automobile underbody shield is mainly a polypropylene reinforced material. The automobile can travel in the country or even the whole world and can experience various complex road environments, so that the material has strict requirements on low-temperature resistance, high strength and the like. At present, in order to cope with complex working conditions, the original petrochemical material is basically selected for modification. With the global economic development and population growth, the demand for petrochemical resources is increasing, and the excessive consumption of resources leads to serious shortage. Moreover, a large amount of garbage is generated after use, which not only pollutes the environment but also affects the ecological balance and threatens human health. Therefore, resource recycling and reuse are imminent, and how to recycle and reuse limited resources is an important environmental protection issue. The development of circular economy industry is the driving force for resource recycling and reuse. The circular economy industry not only reduces the dependence on primary resources but also creates a new economic growth model. Therefore, it is urgent to develop a method for preparing a high-strength, low-temperature-resistant and low-warp underbody shield material using part of PCR materials.

[0003] The prior art discloses a high-heat-oxidation-resistant environment-friendly regenerated polypropylene material and a preparation method thereof. The high-heat-oxidation-resistant environment-friendly regenerated polypropylene material is prepared from the following raw materials in percentage by weight: waste polypropylene 50-80%, inorganic filler 0-30%, elastomer POE 5-20%, interface modifier 0.5-5%, coupling agent 0.1-2%, antioxidant 0.1-2%, and after mixing, melt extrusion, granulation, drying treatment and the like. Although the regenerated polypropylene material obtained by the method has high room temperature toughness and heat-oxidation resistance, it ignores the driving environment of the automobile, and needs to meet the relatively complex high and low temperature and the potholed road surface covered with gravel. Moreover, the method does not list the low-temperature resistance and the ball drop impact test of the material, and the rigidity of the material is poorer than that of the glass fiber filled material, so that the material cannot completely protect the internal parts when encountering potholed road surface and is prone to damage the internal parts.

[0004] The prior art also discloses a polypropylene composite material for automobile underbody shields prepared by using LFT-D technology, comprising 75-90 parts by weight of high melt index polypropylene, 2-15 parts by weight of a compatibilizer, 0.5-5 parts by weight of a flow modifier, 0.5-3 parts by weight of high mesh talc, 0.2-2 parts by weight of a compounded antioxidant system and 0.2-2 parts by weight of a lubricant. The composite material has the characteristics of high rigidity and high flow, and has good processing performance and heat aging resistance, and prevents fiber floating and glass fiber agglomeration. However, when high flow polypropylene is combined with a flow modifier, the molecular chain length and regularity are further reduced, resulting in a large difference in the uniformity of the material crystallization, and when the material is prepared by injection molding LFT-D technology, glass fiber directional flow occurs, finally resulting in warping of the product. The material matrix uses virgin petrochemical products, the cost is relatively high, and the market acceptance is not high.

[0005] Therefore, it is urgent to develop a bottom guard plate material which can meet the requirements of low cost, high strength, low temperature resistance and low warping, so as to effectively solve the above problems. SUMMARY

[0006] The purpose of the present application is to provide a high-strength, low-temperature-resistant and low-warping underbody shield material and a preparation method thereof, so as to solve the problems of reducing the cost of underbody shields, realizing low-temperature impact resistance, low warping and material recycling.

[0007] The present application is realized by the following technical solutions: A high-strength, low-temperature-resistant and low-warping underbody shield material is prepared from the following raw materials by weight: Polypropylene: 51 parts, Toughening agent: 8 parts, Compatibilizer: 5 parts, Glass fiber: 30 parts, Treated silicon dioxide: 3 parts, Processing aid package: 1 part, Wetting agent: 0.5 parts, Black masterbatch: 1.5 parts.

[0008] Further, the polypropylene is single-cylinder washing machine inner barrel PP regenerated material particles, with ash content below 0.2%; the toughening agent is a photovoltaic film, which is a thin film regenerated particle prepared by partially crosslinking four-carbon POE, and is formed by recycling and granulation after use; the compatibilizer is a granular polypropylene grafted maleic anhydride; the wetting agent is a liquid 10# white oil; and the black masterbatch is a PE carrier color masterbatch with a carbon black content of 35%.

[0009] Further, the glass fiber is a short-cut glass fiber.

[0010] Further, the silica is a nano material in powder form, which is prepared from by-products of sodium silicate produced in the process of manufacturing capacitor carbon from rice husks, and is finally formed into treated silica powder after treatment.

[0011] Further, the processing aid package is in powder form, and includes antioxidants and lubricants; the antioxidants include antioxidant 1010, antioxidant 3114, antioxidant 168, and antioxidant DSTDP, the content of antioxidant 1010 is 0.15%, the content of antioxidant 3114 is 0.15%, the content of antioxidant 168 is 0.2%, and the content of antioxidant DSTDP is 0.3%; the content of lubricant EBS is 0.2%.

[0012] A method for preparing a high-strength, low-temperature-resistant, and low-warp bottom guard plate material, comprising the following steps: weighing polypropylene resin particles, toughening agent resin particles, a compatibilizer, and black masterbatch into a stirring pot; then, adding a wetting agent, stirring at 350 RPM for 10 minutes; further adding a processing aid package and treated silica into the stirring pot, stirring at 350 RPM for 10 minutes; adding the mixed material into a main feeding loss weight scale; using a device with a length-diameter ratio of 40:1, adding chopped glass fibers into the side feeding loss weight scale at the sixth section of the extruder cylinder, setting the discharge amount of the main loss weight scale to 35 kg / hour, and setting the discharge amount of the side loss weight scale to 15 kg / hour; starting the main machine, feeding, and starting auxiliary equipment to produce granules.

[0013] Further, the method specifically comprises the following steps: A. Preparation of treated silica: A1. First, filter the by-products such as sodium silicate produced in the process of manufacturing capacitor carbon from rice husks to remove impurities, and test the concentration of sodium silicate in the solution; A2. Introduce the sodium silicate solution into an evaporator, heat the evaporator to boiling of the solution, evaporate the water in the by-products such as sodium silicate, and increase the concentration of sodium silicate; when the concentration of sodium silicate reaches 20%-25%, stop heating and discharge; A3. Enter the reaction pool, start the stirring paddle at a speed of 245 RPM, start the heating system, control the material temperature at 80-90℃, add 16% concentrated hydrochloric acid through an additive pump, control the overall material PH value at 7.5-8.5, stop adding hydrochloric acid, at this time, a gel is formed, and discharge; A4. Enter the dehydration pool, heat to 152℃ until the weight of the material in the dehydration pool is constant, at this time, the gel is completely decomposed into silica, and water is removed in the form of water vapor, and finally discharge; A5. The material obtained in step A4 enters the rinsing pool, the stirring paddle rotates at a speed of 80 RPM, and the material is washed repeatedly twice with twice the volume of deionized water, the excess deionized water is removed, and the material is discharged; A6, into the oven, 165℃, dry for 3 hours standby, at this time, the particle size of silica is between 15-25 nanometers; A7, a certain amount of silica is weighed and poured into a high-speed mixer, the temperature of the high-speed mixer is 120℃, the rotating speed is 1200 RPM, 5% of the mass of the silica is weighed as vinyl triethoxysilane, the vinyl triethoxysilane is diluted with anhydrous ethanol to a concentration of 20% for standby, the diluted vinyl triethoxysilane is sprayed into the high-speed mixer by using an atomizer, the stirring is continued for 8 minutes, and the spraying is completed at 8 minutes, the material is discharged, the silica is placed in a 120℃ oven for 6 hours, and then taken out for standby; A8, the silica completed in step A7 is placed in a rinsing pool, 1.5 times the volume of the silica is added as anhydrous ethanol, and the silica is repeatedly washed three times, then 2 times the volume of the silica is added as deionized water, the silica is filtered out, and placed in a 105℃ oven for drying for 5 hours; B, preparation of modified material: B1, the single-cylinder washing machine inner barrel PP recycled material particle resin, photovoltaic film recycled particle resin, compatibilizer and black masterbatch are put into a stirring pot, then a wetting agent is added, and stirring is carried out at 350 RPM for 10 minutes; B2, processing aid package and treated silica are added to the stirring pot, and stirring is carried out at 350 RPM for 10 minutes; B3, the mixed material is added to the main feeding loss weight scale; B4, chopped glass fiber is added to the side feeding loss weight scale at the sixth section of the extruder barrel; B5, the equipment adopts a length-diameter ratio of 40:1, the discharge amount of the main loss weight scale is set to 35 kg / h, and the discharge amount of the side loss weight scale is set to 15 kg / h; B6, the main machine is started, the frequency is 38 Hz, the feeding is started, the auxiliary equipment is started, and granulation production is carried out.

[0014] Further, in step A6, the particle size of the silica is between 15-25 nanometers, which is measured by a laser nanoparticle size instrument, and after 24 hours under the condition of a relative humidity of 50% and a temperature of 23℃, the water absorption of the silica reaches 4.7% of the self weight.

[0015] Further, the silica in step A8 is placed under the condition of a relative humidity of 50% and a temperature of 23℃ for 24 hours, and after 24 hours, the water absorption of the silica is ≤0.6% of the self weight.

[0016] Compared with the prior art, the method has the following beneficial effects: 1, the method uses single-cylinder washing machine inner barrel PP recycled material particle resin (PCR) and photovoltaic film recycled particle resin, which greatly reduces the cost of the formula, in addition, the use of recycled materials can reduce the dependence on virgin petrochemical products and reduce carbon emissions; 2. The physical properties of the PP recycled granules (PCR) of the single-cylinder washing machine inner barrel are extremely similar to those of K7726H-RC (North Huajin), and the recycled granular resin of the photovoltaic film is a partially cross-linked material. When the material is blended with the base material, the cross-linked part is synergistically reinforced with the glass fiber. The cross-linked molecular chain forms a three-dimensional network structure, which can still maintain good flexibility at low temperatures, avoiding material brittleness. In addition, the uncross-linked part can act as an elastomer to toughen the base material; 3. The hydrophobicity of the treated silica material is improved, increasing the compatibility with the base resin. When injection molding, the presence of treated silica will disturb the directional arrangement of the glass fiber, reducing the absolute value of the difference between the transverse and longitudinal shrinkage of the product, and further showing low product warpage. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0018] Fig. 1 Preparation flow chart of high-strength, low-temperature-resistant, low-warp bottom guard plate material; Fig. 2 Flow chart of the extraction and treatment process of silica. DETAILED DESCRIPTION

[0019] The present application will be further described below in conjunction with the embodiments: The present application will be further described below in conjunction with the embodiments:

[0020] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. At the same time, in the description of the present application, the terms "first", "second", etc. are only used for differentiation, and cannot be understood as indicating or implying relative importance.

[0021] The application discloses a kind of high-strength, low-temperature-resistant, low-warp bottom guard plate material method, the material prepared simultaneously meets high-strength, low-temperature-resistant and low-warp demand.The processed silicon dioxide is obtained after a series of reactions from by-product such as sodium silicate formed by rice hull manufacturing capacitor carbon, polypropylene material is single cylinder washing machine inner barrel PP recycled material particles (PCR), toughening agent selects photovoltaic film recycled particles, other materials are commercially available, material reaches high-strength effect through glass fiber and toughening agent crosslinking part, through toughening agent non-crosslinking part and crosslinking part to achieve low-temperature-resistant effect, when injection molding, through the processed silicon dioxide to destroy the directional flow of glass fiber, reduce the difference between product transverse and longitudinal shrinkage, reduce the warping of material.

[0022] As shown in Figs. 1-2 A kind of high-strength, low-temperature-resistant, low-warp bottom guard plate material and its preparation method, including the following steps: weighing polypropylene resin particles, toughening agent resin particles, compatibilizer, black mother put into stirring pot, then add wetting agent, 350RPM, stir 10 minutes;Processing aid package, processed silicon dioxide are added to stirring pot, 350RPM, stir 10 minutes, then the mixed material is added to main feeder loss weight scale;Equipment uses 40:1 length-diameter ratio, short-cut glass fiber is added in the side feeder loss weight scale at the sixth section of extruder barrel, the discharge amount of main loss weight scale is set to 35 kilograms / hour, the discharge amount of side loss weight scale is set to 15 kilograms / hour.Open main machine, open feeder, open auxiliary equipment, and carry out granulation production.

[0023] Further, specifically includes the following steps: Preparation of processed silicon dioxide: A, preparation of processed silicon dioxide: A1, first filter the by-products such as sodium silicate formed by rice hull manufacturing capacitor carbon, remove impurities, and test the concentration of sodium silicate in the solution; A2, the sodium silicate solution is introduced into an evaporator, the evaporator is heated to boiling of the solution, the water in the by-products such as sodium silicate is evaporated, and the concentration of sodium silicate is increased, when the concentration of sodium silicate reaches 20%-25%, stop heating and discharge; A3, enter the reaction tank, open the stirring paddle, the speed is 245RPM, open the heating system, control the material temperature at 80-90℃, add 16% concentration hydrochloric acid through the aid pump, control the overall material PH value at 7.5-8.5, stop adding hydrochloric acid, at this time, generate a gel (Na2SiO3+2HCI==2NaCI+H2SiO3↓), discharge; A4, enter the dehydration tank, the heating temperature is 152℃, until the weight of the material in the dehydration tank is constant, at this time, the gel is completely decomposed into silicon dioxide (H2SiO3= heating = H2O↑+SiO2↓), the water is discharged in the form of water vapor, and finally discharged; A5, the material enters the rinsing pool, the stirring paddle rotates at 80 RPM, and two times the volume of deionized water is added to clean the silica repeatedly twice, the excess deionized water is discharged, and the material is discharged; A6, enter the oven, 165℃, dry for 3 hours for standby, at this time, the silica particle size is between 15-25 nanometers; A7, weigh a certain amount of silica and pour it into a high-speed mixer, the temperature of the high-speed mixer is 120℃, and the rotating speed is 1200 RPM, weigh 5% of the mass of the silica and dilute the vinyl triethoxysilane with anhydrous ethanol to a concentration of 20% for standby, use an atomizer to spray the diluted vinyl triethoxysilane into the high-speed mixer, continuously stir for 8 minutes, and the spraying is completed in 8 minutes, discharge the material, and place the silica in a 120℃ oven for 6 hours, and take it out for standby; A8, place the silica completed in step A7 in a rinsing pool, add 1.5 times the volume of anhydrous ethanol, clean it repeatedly three times (vinyl triethoxysilane is dissolved in ethanol), then add 2 times the volume of deionized water, filter out the silica, and place it in a 105℃ oven for drying for 5 hours.

[0024] Further, in step A6, the silica particle size is between 15-25 nanometers, which is measured by a laser nanoparticle size instrument, and after 24 hours under the condition of relative humidity 50% and 23℃, the water absorption of the silica reaches 4.7% of the self weight.

[0025] Further, place the silica of step A8 under the condition of relative humidity 50% and 23℃ for 24 hours, and the water absorption is ≤0.6% of the self weight, which indicates that the treatment of the silica with vinyl triethoxysilane reduces the water absorption of the silica, and at this time, the silica is treated silica.

[0026] B, preparation of modified material: B1, put the PP recycled resin particles, photovoltaic film recycled resin particles, compatibilizer, and black masterbatch into a stirring pot, then add a wetting agent, stir at 350 RPM for 10 minutes; B2, add the processing aid package and treated silica to the stirring pot, stir at 350 RPM for 10 minutes; B3, add the mixed material to the main feeding loss weight scale; B4, add the chopped glass fiber to the side feeding loss weight scale at the sixth extruder barrel; B5, the equipment adopts a length-diameter ratio of 40:1, the discharge amount of the main loss weight scale is set to 35 kg / hour, and the discharge amount of the side loss weight scale is set to 15 kg / hour; B6, start the main machine with a frequency of 38 Hz, start the feeding, start the auxiliary equipment, and carry out granulation production.

[0027] The high-strength, low-temperature-resistant, low-warp bottom guard plate material is made of the following raw materials by weight: Polypropylene: 51 parts, Toughening agent: 8 parts, Compatibility agent: 5 parts, Glass fiber: 30 parts, Treated silica: 3 parts, Processing aid package: 1 part, Wetting agent: 0.5 parts, Black masterbatch: 1.5 parts.

[0028] Further, the polypropylene is single-cylinder washing machine inner barrel PP recycled material particles (PCR), with ash content below 0.2%, which is commercially available; the toughening agent is photovoltaic film, which is a thin film recycled particle made of partially cross-linked four-carbon POE, and is commercially available after recycling and granulation.

[0029] Further, the compatibility agent is a granular polypropylene grafted maleic anhydride, and KT-1D product of Shenyang Ketong is selected.

[0030] Further, the glass fiber is T538G of Taishan Glass Fiber Co., Ltd., which is a chopped glass fiber, or 305B of Chongqing International Composite Material Co., Ltd., which is a chopped glass fiber.

[0031] Further, the silica is a nano material in the form of powder, which is a by-product of sodium silicate produced by using rice husk to manufacture capacitive carbon, and is treated through steps A1-A6 to form a silica powder, and then treated through steps A7-A8 to form a treated silica. The by-products such as sodium silicate are provided by Jilin Kaiyu Biomass Development Co., Ltd.

[0032] Further, the processing aid package is a powder, which includes an antioxidant and a lubricant; wherein the antioxidant includes antioxidant 1010, antioxidant 3114, antioxidant 168, and antioxidant DSTDP, the content of antioxidant 1010 is 0.15%, the content of antioxidant 3114 is 0.15%, the content of antioxidant 168 is 0.2%, and the content of antioxidant DSTDP is 0.3%; the content of lubricant EBS is 0.2%.

[0033] Further, the wetting agent is liquid No. 10 white oil.

[0034] Further, the black masterbatch is a PE carrier color masterbatch with a carbon black content of 35%, which is commercially available in the form of particles.

[0035] Comparative Example 1 1. Take 51 parts of polypropylene, 8 parts of toughening agent, 5 parts of compatibilizer, 1.5 parts of black masterbatch into the stirring pot, then add 0.5 parts of wetting agent, 350 RPM, stir for 10 minutes; wherein the polypropylene is K7726H-Beifang Huajin, the toughening agent is photovoltaic film recycled particles, and the compatibilizer is KT-1D; 2. Add 1 part of processing aid package and 3 parts of treated silicon dioxide to the stirring pot, 350 RPM, stir for 10 minutes; 3. Add the mixed material to the main feeding loss weight scale; 4. Add 30 parts of chopped glass fiber, specifically T538G, to the side feeding loss weight scale at the sixth section of the extruder barrel; 5. The equipment adopts a length-diameter ratio of 40:1, the discharge amount of the main loss weight scale is set to 35 kg / hour, and the discharge amount of the side loss weight scale is set to 15 kg / hour; 6. Start the main machine, the frequency is 38 Hz, start the feeding, start the auxiliary equipment, and carry out granulation production.

[0036] Comparative Example 2 1. Take 51 parts of polypropylene, 8 parts of toughening agent, 5 parts of compatibilizer, 1.5 parts of black masterbatch into the stirring pot, then add 0.5 parts of wetting agent, 350 RPM, stir for 10 minutes; wherein the polypropylene is single-cylinder washing machine inner barrel PP recycled material particles (PCR), the toughening agent is HM7387-Dow Chemical, and the compatibilizer is KT-1D; 2. Add 1 part of processing aid package and 3 parts of treated silicon dioxide to the stirring pot, 350 RPM, stir for 10 minutes; 3. Add the mixed material to the main feeding loss weight scale; 4. Add 30 parts of chopped glass fiber, specifically T538G, to the side feeding loss weight scale at the sixth section of the extruder barrel; 5. The equipment adopts a length-diameter ratio of 40:1, the discharge amount of the main loss weight scale is set to 35 kg / hour, and the discharge amount of the side loss weight scale is set to 15 kg / hour; 6. Start the main machine, the frequency is 38 Hz, start the feeding, start the auxiliary equipment, and carry out granulation production.

[0037] Comparative Example 3 1. Take 51 parts of polypropylene, 8 parts of toughening agent, 5 parts of compatibilizer, 1.5 parts of black masterbatch into the stirring pot, then add 0.5 parts of wetting agent, 350 RPM, stir for 10 minutes; wherein the polypropylene is single-cylinder washing machine inner barrel PP recycled material particles (PCR), the toughening agent is photovoltaic film recycled particles, and the compatibilizer is KT-1D; 2. Silicon dioxide preparation: 2-1, First, filter the by-products such as sodium silicate formed by rice husk manufacturing capacitor carbon, remove impurities, and test the concentration of sodium silicate in the solution; 2-2, the sodium silicate solution is introduced into the evaporator, the evaporator is heated to boiling of the solution, the water in the by-products such as sodium silicate is evaporated, and the concentration of sodium silicate is increased; when the concentration of sodium silicate reaches 20%-25%, the heating is stopped, and the material is discharged; 2-3, entering the reaction pool, the stirring paddle is started, the rotating speed is 245 RPM, the heating system is started, the material temperature is controlled at 80-90℃, 16% concentration hydrochloric acid is added through the auxiliary pump, when the overall material PH value is controlled at 7.5-8.5, the addition of hydrochloric acid is stopped, at this time, the colloidal substance (Na2SiO3+2HCl==2NaCl+H2SiO3↓) is generated, and the material is discharged; 2-4, entering the dehydration pool, the heating temperature is 152℃, until the weight of the material in the dehydration pool is constant, at this time, the colloidal substance is completely decomposed into silicon dioxide (H2SiO3=heating=H2O↑+SiO2↓), the water is discharged in the form of water vapor, and finally the material is discharged; 2-5, the material enters the rinsing pool, the rotating speed of the stirring paddle is 80 RPM, two times the volume of the silicon dioxide of deionized water is added for repeated cleaning twice, the excess deionized water is discharged, and the material is discharged; 2-6, entering the oven, 165℃, drying for 3 hours for standby, at this time, the particle size of the silicon dioxide is between 15-25 nanometers; 2-7, adding 1 part of processing aid package and 3 parts of 15-25 nanometer silicon dioxide into the stirring pot, 350 RPM, stirring for 10 minutes; 3, the mixed material is added into the main feeding loss weight scale; 4, 30 parts of chopped glass fiber, specifically T538G, are added into the side feeding loss weight scale at the sixth section of the extruder barrel; 5, the equipment adopts a length-diameter ratio of 40:1, the discharge amount of the main loss weight scale is set to 35 kg / hour, and the discharge amount of the side loss weight scale is set to 15 kg / hour; 6, the main machine is started, the frequency is 38 Hz, the feeding is started, the auxiliary equipment is started, and the granulation production is carried out.

[0038] Comparative Example 4 1, 54 parts of polypropylene, 8 parts of toughening agent, 5 parts of compatibilizer, and 1.5 parts of black masterbatch are put into the stirring pot, then 0.5 parts of wetting agent is added, 350 RPM, stirring for 10 minutes; wherein the polypropylene is single-cylinder washing machine inner barrel PP regenerated material particles (PCR), the toughening agent is photovoltaic film regenerated particles, and the compatibilizer is KT-1D; 2, 1 part of processing aid package is added into the stirring pot, 350 RPM, stirring for 10 minutes; 3, the mixed material is added into the main feeding loss weight scale; 4, 30 parts of chopped glass fiber, specifically T538G, are added into the side feeding loss weight scale at the sixth section of the extruder barrel; 5, the device adopts 40:1 length-diameter ratio, the setting of the main loss of weight scale is 35 kg / h, and the setting of the side loss of weight scale is 15 kg / h; 6, start the main machine, the frequency is 38 Hz, start the feeding, start the auxiliary equipment, and carry out granulation production.

[0039] Example 1, take 51 parts of polypropylene, 8 parts of toughening agent, 5 parts of compatibilizer, 1.5 parts of black masterbatch into the stirring pot, then add 0.5 parts of wetting agent, 350 RPM, stir for 10 minutes; wherein, the polypropylene is single cylinder washing machine inner barrel PP regenerated material particles (PCR), the toughening agent is photovoltaic film regenerated particles, and the compatibilizer is KT-1D.

[0040] 2, the prepared silicon dioxide: 2-1, first filter the by-products such as sodium silicate formed by the rice husk manufacturing capacitor carbon, filter out impurities, and test the concentration of sodium silicate in the solution; 2-2, introduce the sodium silicate solution into the evaporator, heat the evaporator to boiling of the solution, evaporate the water in the by-products such as sodium silicate, and increase the concentration of sodium silicate, when the concentration of sodium silicate reaches 20%-25%, stop heating and discharge; 2-3, enter the reaction tank, open the stirring paddle at a speed of 245 RPM, start the heating system, control the material temperature at 80-90℃, add 16% concentrated hydrochloric acid through the additive pump, control the overall material PH value at 7.5-8.5, stop adding hydrochloric acid, at this time, the gelatinous substance (Na2SiO3+2HCl==2NaCl+H2SiO3↓) is generated, and the discharge is carried out; 2-4, enter the dehydration tank, heat to 152℃ until the weight of the material in the dehydration tank is constant, at this time, the gelatinous substance is completely decomposed into silicon dioxide (H2SiO3=heating=H2O↑+SiO2↓), the water is discharged in the form of water vapor, and finally the discharge is carried out; 2-5, the material enters the rinsing tank, the stirring paddle rotates at a speed of 80 RPM, and two times the volume of the silicon dioxide of deionized water is added for repeated cleaning twice, the excess deionized water is discharged, and the discharge is carried out; 2-6, enter the oven, 165℃, dry for 3 hours for standby, at this time, the particle size of the silicon dioxide is between 15-25 nanometers; 2-7, weigh a certain amount of silicon dioxide, pour it into a high-speed mixer, the temperature of the high-speed mixer is 120℃, and the rotating speed is 1200 RPM, weigh 5% of the mass of the silicon dioxide of vinyl triethoxysilane, dilute the vinyl triethoxysilane with anhydrous ethanol to 20% concentration for standby, use an atomizer to spray the diluted vinyl triethoxysilane into the high-speed mixer, continuously stir for 8 minutes, and the spraying is completed at 8 minutes, discharge, and place the silicon dioxide in a 120℃ oven for 6 hours, take it out for standby; 2-8, Put the silica completed in step 2-step 7 into a rinsing pool, add 1.5 times the volume of the silica of anhydrous ethanol, repeatedly clean three times (vinyl triethoxysilane is dissolved in ethanol), then add 2 times the volume of the silica of deionized water, filter out the silica, and place it in an oven at 105 DEG C, and dry for 5 hours;

[0041] 2-9, Add 1 part of the processing aid package and 3 parts of the treated silica into a stirring pot, stir at 350 RPM for 10 minutes; 3, Add the mixed material into the main feeding loss weight scale; 4, Add 30 parts of chopped glass fiber, specifically T538G, into the side feeding loss weight scale at the sixth section of the extruder barrel; 5, The equipment adopts a length-diameter ratio of 40:1, the discharge amount of the main loss weight scale is set to 35 kg / h, and the discharge amount of the side loss weight scale is set to 15 kg / h; 6, Start the main machine, the frequency is 38 Hz, start the feeding, start the auxiliary equipment, and perform granulation production.

[0042] It should be particularly noted that, if the specific technology or condition is not specified in the examples, the technology or condition is performed according to the description in the literature in the field or according to the product manual, and if the manufacturer of the reagent or instrument is not specified, the reagent or instrument is a conventional product that can be obtained on the market.

[0043] The present application provides the component allocation ratio of Comparative Example 1-Comparative Example 4, the component allocation ratio of Comparative Example 1-Comparative Example 3 is shown in Table 1, in parts by weight: Table 1

[0044] The above test results are as follows: Table 2

[0045] The reference standards are as follows: Density: GB / T1033.1, tensile strength: GB / T1040.2, bending strength: GB / T9341, notched Charpy impact strength: GB / T1043.1, shrinkage: GB / T17037.4. Drop ball impact: three samples with a size of 60mm*60mm are cut from the relatively flat part of the product, and the impact test is performed. After the test, the appearance quality of the impact sample is visually inspected.

[0046] a, room temperature, steel ball weight 500g±5g, drop ball height h=(300±0.5)mm; b. After cold resistance, the sample is placed in a ultra-low temperature box with a temperature of (-40±2)℃ for 24h, and immediately after taking out, impact is carried out, the steel ball weight is 500g±5g, and the drop ball height h=(400±0.5)mm.

[0047] From the comparative example 1 and the example 1, it can be known that: in the formula, the raw material K7726H (Beifang Huajin) is replaced by single-cylinder washing machine inner barrel PP recycled material particles (PCR) added in the formula, the physical properties of the whole formula system are basically unchanged, and the purposes of cost reduction, carbon reduction and recycling can be achieved.

[0048] From the comparative example 2 and the example 1, it can be known that: the addition of photovoltaic film recycled particles has more advantages than HM7387 (Dow Chemical), especially in the aspects of bending strength, bending modulus, notched Charpy impact strength-30℃ and drop ball impact (-40℃, 24h).

[0049] From the comparative example 3 and the example 1, it can be known that: the treated silicon dioxide is superior to the untreated silicon dioxide in the aspects of bending strength, bending modulus and the absolute value of the difference between transverse and longitudinal shrinkage rate.

[0050] From the comparative example 3 to the comparative example 4 and the example 1, it can be known that: the addition of untreated silicon dioxide has a lower absolute value of the difference between transverse and longitudinal shrinkage rate than the addition of no silicon dioxide; the addition of treated silicon dioxide can greatly reduce the absolute value of the difference between transverse and longitudinal shrinkage rate of the material, and thus the warpage of the product can be reduced.

[0051] In summary: in the formula, the single-cylinder washing machine inner barrel PP recycled material particles (PCR) can be used to replace the raw material K7726H; the photovoltaic film recycled particles have more advantages than HM7387 in the aspects of low temperature resistance and mechanical strength; the silicon dioxide can reduce the absolute value of the difference between transverse and longitudinal shrinkage rate of the material, and the treated silicon dioxide has more advantages.

[0052] It should be noted that the design of the above digital prototype model, the parameter setting of each material and the selection of the measurement plane are only preferred embodiments of the present application and the technical principles applied. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the scope of the present application. Therefore, although the present application has been described in more detail through the above embodiments, the present application is not limited to the above embodiments, and can include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the appended claims.

Claims

1. A high strength, low temperature resistant, low warpage floor pan material characterized in that, is made from the following raw materials by weight: Polypropylene: 51 parts, Toughening agent: 8 parts, Compatibility agent: 5 parts, Glass fiber: 30 parts, Treated silicon dioxide: 3 parts, Processing aid package: 1 part, Wetting agent: 0.5 parts, Black masterbatch: 1.5 parts.

2. The high strength, low temperature resistant, low warpage floor protection material of claim 1, wherein: The polypropylene is a single-cylinder washing machine inner barrel PP recycled material particle, with ash content below 0.2%; the toughening agent is a photovoltaic film, which is a thin film recycled particle made from partially cross-linked four-carbon POE, and is made by recycling and granulation after use; the compatibility agent is a granular polypropylene grafted maleic anhydride; the wetting agent is a liquid 10# white oil; the black masterbatch is a PE carrier color masterbatch with carbon black content of 35%.

3. The high strength, low temperature resistant, low warpage floor protection material of claim 1, wherein: The glass fiber is a chopped glass fiber.

4. The high strength, low temperature resistant, low warpage floor protection material of claim 1, wherein: The silicon dioxide is a nano material in the form of powder, which is a by-product of sodium silicate formed by manufacturing capacitor carbon from rice husk, and is finally formed into silicon dioxide powder after treatment, and is further treated to form treated silicon dioxide.

5. The high strength, low temperature resistant, low warpage floor protection material of claim 1, wherein: The processing aid package is a powder, including antioxidants and lubricants; wherein the antioxidants include antioxidant 1010, antioxidant 3114, antioxidant 168 and antioxidant DSTDP, the content of antioxidant 1010 is 0.15%, the content of antioxidant 3114 is 0.15%, the content of antioxidant 168 is 0.2%, and the content of antioxidant DSTDP is 0.3%; the content of lubricant EBS is 0.2%.

6. The method for preparing a high-strength, low-temperature resistant, and low-warpage bottom protective plate material according to claim 1, characterized in that, It includes the following steps: weigh the polypropylene resin particles, toughening agent resin particles, compatibility agent, and black masterbatch into a stirring pot; then, add the wetting agent, stir at 350 RPM for 10 minutes; then add the processing aid package and treated silicon dioxide to the stirring pot, stir at 350 RPM for 10 minutes; add the mixed material to the main feeding loss weight scale; the equipment adopts a length-diameter ratio of 40:1, the chopped glass fiber is added to the side feeding loss weight scale at the sixth section of the extruder cylinder, the discharge amount of the main loss weight scale is set to 35 kg / hour, and the discharge amount of the side loss weight scale is set to 15 kg / hour; turn on the main machine, turn on the feeding, turn on the auxiliary equipment, and carry out granulation production.

7. The method for preparing a high-strength, low-temperature resistant, and low-warpage bottom protection plate material according to claim 6, characterized in that, Specifically includes the following steps: A, preparation of treated silicon dioxide: A1, first filter the by-product of sodium silicate formed by manufacturing capacitor carbon from rice husk, filter out impurities, and test the concentration of sodium silicate in the solution; A2, introduce the sodium silicate solution into the evaporator, heat the evaporator to boiling of the solution, evaporate the water in the sodium silicate by-product, and increase the concentration of sodium silicate; when the concentration of sodium silicate reaches 20%-25%, stop heating and discharge; A3, enter the reaction tank, start the stirring paddle at 245 RPM, start the heating system, control the material temperature at 80-90℃, add 16% concentrated hydrochloric acid through the aid pump, control the overall material PH value at 7.5-8.5, stop adding hydrochloric acid, at this time, a gel is formed, and the discharge is completed; A4, enter the dehydration tank, heat to 152℃, until the weight of the material in the dehydration tank is constant, at this time, the gel is completely decomposed into silicon dioxide, and the water is discharged in the form of water vapor, and finally the discharge is completed; A5, the material obtained in step A4 enters a rinsing pool, the stirring paddle rotates at 80 RPM, and two times the volume of the silica of deionized water is added repeatedly for two times, the excess deionized water is discharged, and the material is discharged; A6, enter the oven, 165℃, dry for 3 hours for standby, at this time, the silica particle size is between 15-25 nanometers; A7, a certain amount of silica is weighed and poured into a high-speed mixer, the temperature of the high-speed mixer is 80℃, and the rotating speed is 1200 RPM, 5% of the mass of the silica of vinyl triethoxysilane is weighed, the vinyl triethoxysilane is diluted with anhydrous ethanol to a concentration of 20% for standby, the diluted vinyl triethoxysilane is sprayed into the high-speed mixer by using an atomizer, and stirring is continued for 8 minutes, and the spraying is completed at 8 minutes, the material is discharged, the silica is placed in an 80℃ oven for 6 hours, and taken out for standby; A8, the silica completed in step A7 is placed in a rinsing pool, 1.5 times the volume of the silica of anhydrous ethanol is added, and repeated washing is performed three times, 2 times the volume of the silica of deionized water is further added, the silica is filtered out, and is placed in a 105℃ oven for drying for 5 hours; B, preparation of modified material: B1, the PP recycled material granular resin in the single-cylinder washing machine inner barrel, the photovoltaic film recycled granular resin, the compatibilizer, and the black masterbatch are put into a stirring pot, and then the wetting agent is added, 350 RPM, and stirring is performed for 10 minutes; B2, the processing aid package and the treated silica are added to the stirring pot, 350 RPM, and stirring is performed for 10 minutes; B3, the mixed material is added to the main feeding loss weight scale; B4, the chopped glass fiber is added to the side feeding loss weight scale at the sixth extruder barrel; B5, the equipment adopts a length-diameter ratio of 40:1, the discharge amount of the main loss weight scale is set to 35 kg / hour, and the discharge amount of the side loss weight scale is set to 15 kg / hour; B6, the main machine is started, the frequency is 38 Hz, the feeding is started, the auxiliary equipment is started, and the granulation production is performed.

8. The method for preparing a high-strength, low-temperature resistant, and low-warpage bottom protection plate material according to claim 7, characterized in that: In step A6, the particle size of the silica is between 15-25 nanometers, which is measured by a laser nanoparticle size instrument, and after 24 hours under the condition of a relative humidity of 50% and 23℃, the water absorption amount of the silica reaches 4.7% of the self weight.

9. The method for preparing a high-strength, low-temperature resistant, and low-warpage bottom protection plate material according to claim 8, characterized in that: The silica in step A8 is placed under the condition of a relative humidity of 50% and 23℃ for 24 hours, and the water absorption amount is ≤0.6% of the self weight.

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