High-light-transmittance polypropylene material as well as preparation method and application thereof

Abstract

The invention provides a high-light-transmittance polypropylene material as well as a preparation method and application thereof. The material is prepared from the following raw materials: high-rigidity homo-polypropylene resin, polypropylene random copolymer resin, modified magnesium sulfate whiskers, a transparent nucleating agent, a flexibilizer and a stabilizer. Wherein the modified magnesium sulfate whisker is magnesium sulfate whisker modified by polyaspartic acid PASP (polyaspartic acid) and fatty acid together. The material solves the problem that mechanical properties and high light transmittance of modified polypropylene cannot be achieved at the same time, and the application range of the high-light-transmittance polypropylene material is greatly widened.

Description

Technical Field

[0001] The invention belongs to the field of polymer material modification, and in particular relates to a high-light-transmittance polypropylene material and a preparation method and application thereof. Background Art

[0002] The development of new energy vehicles has put more and more demands on intelligence and technology, and pays more attention to the creation of a sense of the future. In order to better reflect the intelligence and technology, automobile manufacturers regard lighting as an important factor in the design of automobile exteriors. In addition to requiring the materials of automobile exteriors to have a certain light transmittance, unique patterns or LOGOs can be designed on them, and backlight components can be placed behind them, thus presenting a cool sense of intelligence and technology.

[0003] Patent CN 112795092A discloses a polypropylene composite material suitable for high-transmittance automotive materials and a preparation method thereof. In this method, nucleating agents, inorganic fillers, toughening agents, scratch-resistant agents and other additives are added to polypropylene materials for blending and processing. Organic α-crystal nucleating agents are used to improve the strength and transmittance of the material and reduce the haze. However, the introduction of a large amount of inorganic fillers in this solution severely limits the improvement of the material's transmittance. The highest transmittance of the prepared material is only 34%.

[0004] Patent CN112375304A discloses a transparent polypropylene material and a preparation method thereof, wherein the transparent polypropylene material is obtained by mixing polypropylene resin powder, an antioxidant, a halogen absorber and a nucleating agent and then extruding the mixture. Although the method can obtain a material with high transparency, the rigidity of the material is low, which limits its application.

[0005] In summary, the current high transmittance polypropylene material still has the problem that mechanical properties and high transmittance cannot be achieved at the same time, which needs to be solved urgently. Summary of the invention

[0006] In order to solve the above technical problems, one of the purposes of the present invention is to provide a high-transmittance polypropylene material, which solves the problem that the mechanical properties of modified polypropylene and high transmittance cannot be achieved at the same time, and greatly broadens the application scope of the high-transmittance polypropylene material.

[0007] In order to achieve the above-mentioned invention object, the technical solution adopted by the present invention is as follows:

[0008] A high light transmittance polypropylene material, the material is prepared by the following raw materials:

[0009] High rigidity homopolymer polypropylene resin 30-55%,

[0010] Random copolymer polypropylene resin 25-50%,

[0011] Modified magnesium sulfate whisker 5-10%,

[0012] 0.5 - 1.5% of a transparent nucleating agent,

[0013] 8 - 12% of a toughening agent,

[0014] 0.3 - 0.7% of a stabilizer;

[0015] Among them, the modified magnesium sulfate whiskers are magnesium sulfate whiskers modified by polyaspartic acid (PASP) and fatty acids together.

[0016] In the present invention, polyaspartic acid (PASP) and fatty acids are used together to modify magnesium sulfate whiskers. Among them, polyaspartic acid can be adsorbed on the surface of magnesium sulfate whiskers, and under the action of electrostatic repulsion, the dispersibility of magnesium sulfate whiskers is greatly improved. At the same time, the carboxyl group in the fatty acid can react with the hydroxyl group on the surface of the magnesium sulfate whiskers, making the whiskers exhibit good hydrophobicity and improving the compatibility with the resin matrix. Under the synergistic action of the two, the dispersibility and compatibility of magnesium sulfate whiskers in polypropylene resin are improved;

[0017] In an embodiment of the present invention, the high-rigidity homopolypropylene resin is a polypropylene resin with a melt mass flow rate of 5 - 100 g / 10 min at 230 °C under a load of 2.16 kg, and a flexural modulus of the material > 1800 MPa.

[0018] In an embodiment of the present invention, the random copolymer polypropylene resin is a polymer obtained by random copolymerization of propylene and ethylene, and has a melt mass flow rate of 1 - 10 g / 10 min at 230 °C under a load of 2.16 kg.

[0019] In an embodiment of the present invention, the preparation method of the modified magnesium sulfate whiskers is as follows:

[0020] S1: Add magnesium sulfate whiskers to water for dispersion treatment, add polyaspartic acid, adjust the pH, and react to obtain a pre-dispersed magnesium sulfate whisker slurry;

[0021] S2: Add the pre-dispersed magnesium sulfate whisker slurry to the dissolved fatty acid, react, filter, wash, and dry to obtain the modified magnesium sulfate whiskers.

[0022] In an embodiment of the present invention, the addition amount of polyaspartic acid in S1 is 0.4 - 0.8% of the mass of magnesium sulfate whiskers.

[0023] In an embodiment of the present invention, the aspect ratio of magnesium sulfate whiskers in S1 > 30, and preferably the aspect ratio is 35 - 100.

[0024] In an embodiment of the present invention, the dispersion treatment in S1 is ultrasonic treatment; preferably, the ultrasonic treatment time is 0.5 - 1 h.

[0025] In one embodiment of the present invention, the pH of S1 is adjusted to 7-10.

[0026] In one embodiment of the present invention, S1 reacts at a temperature of 60-80 °C for 1-3 h.

[0027] In one embodiment of the present invention, the mass ratio of fatty acid to magnesium sulfate whisker in S2 is (0.3-0.7):1.

[0028] In one embodiment of the present invention, the fatty acid in S2 is one or more of lauric acid, palmitic acid, and stearic acid.

[0029] In one embodiment of the present invention, the solvent in S2 is an alcohol having 2-5 carbon atoms, preferably ethanol.

[0030] In one embodiment of the present invention, S2 reacts at a temperature of 60-80 °C for 0.5-1.5 h.

[0031] In one embodiment of the present invention, the transparent nucleating agent is one or more of carboxylate metal salt nucleating agents, sorbitol nucleating agents, and aryl phosphate nucleating agents.

[0032] In one embodiment of the present invention, the toughening agent is one or more of vinyl-poly-diene-styrene block copolymers, styrene-ethylene-butadiene-styrene copolymers, ethylene-octene copolymers, and ethylene-butene copolymers.

[0033] In one embodiment of the present invention, the stabilizer is an antioxidant and a light stabilizer; preferably, the antioxidant is selected from one or more of hindered phenol antioxidants, hindered amine antioxidants, phosphite antioxidants, thiodipropionate antioxidants, and mercaptan antioxidants, preferably hindered phenol antioxidants and phosphite antioxidants; preferably, the light stabilizer is selected from one or more of hindered amine light stabilizers, benzophenone light stabilizers, salicylate light stabilizers, and benzotriazole light stabilizers, preferably hindered amine light stabilizers; preferably, the mass ratio of the hindered phenol antioxidant, the phosphite antioxidant, and the hindered amine light stabilizer is (0.1-0.3):(0.1-0.3):(0.1-0.2).

[0034] Another object of the present invention is to provide a method for preparing a high light transmittance polypropylene material.

[0035] A method for preparing a high light transmittance polypropylene material, wherein the polypropylene material is the above-mentioned material, and the method is as follows:

[0036] Mix high-rigidity homopolypropylene, random copolymer polypropylene resin, transparent nucleating agent, toughening agent, and stabilizer to obtain a premix. The premix is added through the main feeding port of an extruder, and modified magnesium sulfate whiskers are added through the side feeding port of the extruder. Then, it is extruded, cooled, and pelletized to obtain a polypropylene material with high light transmittance.

[0037] In one embodiment of the present invention, the temperatures of each zone of the extruder and the screw speed during extrusion are as follows: the temperature of zone 1 is 100 - 120 °C, the temperature of zone 2 is 120 - 150 °C, the temperature of zone 3 is 140 - 190 °C, the temperature of zone 4 is 180 - 210 °C, the temperatures of zones 5 to 15 are 190 - 220 °C, the temperature of the die head is 180 - 210 °C, and the screw speed is 500 - 800 r / min.

[0038] Another object of the present invention is to provide a use of the polypropylene material with high light transmittance.

[0039] A use of a polypropylene material with high light transmittance, wherein the polypropylene material is the above-mentioned material or the material prepared by the above-mentioned method, and the material is used in the field of interior and exterior automotive trims.

[0040] Compared with the prior art, the present invention has the following technical advantages:

[0041] (1) Improve the dispersibility and compatibility of magnesium sulfate whiskers in polypropylene resin;

[0042] (2) Restrict the movement of molecular chains during the heating process of the material, thereby improving the heat resistance stability of the material;

[0043] (3) The preparation method of the present invention is simple and the production cost is low. Detailed implementation manners

[0044] The following further illustrates the present invention through specific examples. The examples described in the present invention are only for the illustration of the present invention and do not limit the scope of the present invention.

[0045] The main test methods involved in the following examples of the present invention are as follows:

[0046] <1> Mechanical property test:

[0047] Flexural property: Test using a ZWICK Z010 universal testing machine according to the provisions of ISO 178:2019 standard;

[0048] Izod notched impact: Test using a ZWICK HIT25P impact testing machine according to the provisions of ISO 180:2019 standard.

[0049] <2>Transmittance test: Using a X-Rite color difference meter, the extruded particles were injection molded into 2-mm and 3-mm color plates respectively using a single-screw injection molding machine, and the test was carried out in the transmission mode of the colorimeter according to the provisions of ASTM D1003-2013 standard;

[0050] <3>Heat deflection temperature under load test: Using an INSTRON HV6M thermal analyzer, the test was carried out under a pressure of 0.45 MPa according to the provisions of ISO 75-2:2013 standard;

[0051] In each of the examples and comparative examples, the grades and sources of the main raw materials are shown in Table 1:

[0052] Table 1 Grades and Sources of Main Raw Materials

[0053]

[0054]

[0055] Unless otherwise specified, other raw materials and reagents were obtained through commercial channels on the market.

[0056] Preparation Example 1

[0057] The preparation method of modified magnesium sulfate whisker A is as follows:

[0058] 1) Disperse 50 g of magnesium sulfate whisker WS-3D in 2500 g of deionized water, put it into an ultrasonic cleaner for ultrasonic treatment for 1 h, then add 0.3 g of 0.6% dispersant polyaspartic acid (PASP) of magnesium sulfate whisker, add NaOH to adjust the pH to 8, and stir and react in a constant temperature water bath at 70 °C for 1 h to obtain a preliminarily pre-dispersed magnesium sulfate whisker slurry.

[0059] 2) Completely dissolve 35 g of lauric acid in 700 g of absolute ethanol solution, and slowly add all the preliminarily obtained pre-dispersed magnesium sulfate whisker slurry (where the mass of lauric acid is 0.7 times that of magnesium sulfate whisker WS-3D). And place it in a constant temperature water bath at 60 °C and stir and react for 1.5 h. After the reaction is completed, filter by suction and wash it clean with absolute ethanol, and dry it to obtain modified magnesium sulfate whisker A.

[0060] Preparation Example 2

[0061] The preparation method of modified magnesium sulfate whisker B is as follows:

[0062] 1) Disperse 50 g of magnesium sulfate whiskers WS-3D in 2500 g of deionized water, place it in an ultrasonic cleaner for ultrasonic treatment for 0.5 h, then add 0.4 g of the dispersant polyaspartic acid (PASP), which is 0.8% of the magnesium sulfate whiskers, add NaOH to adjust the pH to 10, and stir and react in a constant temperature water bath at 60 °C for 1.5 h to obtain a preliminarily pre-dispersed magnesium sulfate whisker slurry.

[0063] 2) Completely dissolve 15 g of stearic acid in 300 g of anhydrous ethanol solution, and slowly add all of the preliminarily obtained pre-dispersed magnesium sulfate whisker slurry (where the mass of stearic acid is 0.3 times that of magnesium sulfate whiskers WS-3D). Place it in a constant temperature water bath at 80 °C and stir and react for 1 h. After the reaction is completed, filter by suction and wash it clean with anhydrous ethanol, and dry it to obtain modified magnesium sulfate whiskers B.

[0064] Preparation Example 3

[0065] The preparation method of modified magnesium sulfate whiskers C is as follows:

[0066] 1) Disperse 50 g of magnesium sulfate WS-152 whiskers in 2500 g of deionized water, place it in an ultrasonic cleaner for ultrasonic treatment for 1 h, then add 0.2 g of the dispersant polyaspartic acid (PASP), which is 0.4% of the magnesium sulfate whiskers, add NaOH to adjust the pH to 7, and stir and react in a constant temperature water bath at 70 °C for 2 h to obtain a preliminarily pre-dispersed magnesium sulfate whisker slurry.

[0067] 2) Completely dissolve 25 g of palmitic acid in 500 g of anhydrous ethanol solution, and slowly add all of the preliminarily obtained pre-dispersed magnesium sulfate whisker slurry (where the mass of palmitic acid is 0.5 times that of magnesium sulfate whiskers WS-152). Place it in a constant temperature water bath at 70 °C and stir and react for 0.5 h. After the reaction is completed, filter by suction and wash it clean with anhydrous ethanol, and dry it to obtain modified magnesium sulfate whiskers C.

[0068] Preparation Comparative Example 1

[0069] The preparation method of modified magnesium sulfate whiskers D is as follows:

[0070] 1) Disperse 50 g of magnesium sulfate whiskers WS-3D in 2500 g of deionized water, place it in an ultrasonic cleaner for ultrasonic treatment for 1 h, and place it in a constant temperature water bath and stir for 1.5 h to obtain a preliminarily pre-dispersed magnesium sulfate whisker slurry.

[0071] 2) Completely dissolve 35 g of lauric acid in 700 g of anhydrous ethanol solution, and slowly add all of the preliminarily obtained pre-dispersed magnesium sulfate whisker slurry (where the mass of lauric acid is 0.7 times that of magnesium sulfate whiskers WS-3D). Place it in a constant temperature water bath at 60 °C and stir and react for 1.5 h. After the reaction is completed, filter by suction and wash it clean with anhydrous ethanol, and dry it to obtain modified magnesium sulfate whiskers D.

[0072] Preparation of Comparative Example 2

[0073] The preparation method of modified magnesium sulfate whisker E is as follows:

[0074] 1) Disperse 50 g of magnesium sulfate whisker WS-3D in 2500 g of deionized water, put it into an ultrasonic cleaner for ultrasonic treatment for 1 h, then add 0.3 g of 0.6% dispersant polyaspartic acid (PASP) of magnesium sulfate whisker WS-3D, add NaOH to adjust the pH to 8, stir and react in a constant temperature water bath at 70 °C for 1 h. After the reaction, filter by suction and wash with absolute ethanol until clean, and dry to obtain modified magnesium sulfate whisker E.

[0075] Example 1

[0076] A high light transmittance polypropylene material, the material is prepared from the following raw materials, based on a total of 10 kg:

[0077] High rigidity homopolypropylene 6012: 53.3%,

[0078] Random copolymer polypropylene QCT02N: 25%,

[0079] Modified magnesium sulfate whisker A: 8%,

[0080] Transparent nucleating agent NX8000: 1%,

[0081] Toughening agent 1657M: 12%,

[0082] Antioxidant SUNSHOW 1010: 0.3%,

[0083] Antioxidant SUNSHOW 168: 0.2%,

[0084] Plastic stabilizer 5585: 0.2%;

[0085] Specifically, add modified magnesium sulfate whisker A from the side feeding port of the extruder, and add the premix obtained by mixing other raw materials from the main feeding port for screw extrusion, and then cool and pelletize to obtain the high light transmittance polypropylene material.

[0086] Among them, the temperature of the first zone of the screw is 100 °C, the temperature of the second zone is 120 °C, the temperature of the third zone is 180 °C, the temperature of the fourth zone is 210 °C, the temperature of the fifth to tenth zones is 220 °C, the temperature of the die head is 210 °C, and the screw speed is 650 r / min.

[0087] Example 2

[0088] A high light transmittance polypropylene material, the material is prepared from the following raw materials, based on a total of 10 kg:

[0089] High-rigidity homopolypropylene PPH-MM60: 48%,

[0090] Random copolymer polypropylene 5012XT: 35%,

[0091] Modified magnesium sulfate whisker B: 5%,

[0092] Transparent nucleating agent NX8000: 1.5%,

[0093] Toughening agent 7311F: 10%,

[0094] Antioxidant SUNSHOW1010: 0.2%,

[0095] Antioxidant SUNSHOW626: 0.2%,

[0096] Plastic stabilizer 5585: 0.1%;

[0097] Specifically, the modified magnesium sulfate whisker B is added from the side feeding port of the extruder, and the premix obtained by mixing other raw materials is added from the main feeding port for screw extrusion, followed by cooling and pelletizing to obtain a high light transmittance polypropylene material.

[0098] Among them, the temperature of the first zone of the screw is 120 °C, the second zone is 140 °C, the third zone is 190 °C, the fourth zone is 200 °C, the temperature of the fifth to tenth zones is 210 °C, the temperature of the die head is 200 °C, and the screw speed is 500 r / min.

[0099] Example 3

[0100] A high light transmittance polypropylene material, which is prepared from the following raw materials, calculated based on a total amount of 10 kg:

[0101] High-rigidity homopolypropylene 6012: 30.9%,

[0102] Random copolymer polypropylene QCT02N: 50%,

[0103] Modified magnesium sulfate whisker C: 10%,

[0104] Transparent nucleating agent NA-11: 0.5%,

[0105] Toughening agent 1657M: 8%,

[0106] Antioxidant SUNSHOW 1010: 0.2%,

[0107] Antioxidant SUNSHOW 626: 0.2%,

[0108] Plastic stabilizer 5519: 0.2%;

[0109] Specifically, the modified magnesium sulfate whisker C is added from the side feeding port of the extruder, and the premix obtained by mixing other raw materials is added from the main feeding port for screw extrusion, followed by cooling and granulation to obtain a high light transmittance polypropylene material.

[0110] Among them, the temperature of the first zone of the screw is 110 °C, the second zone is 130 °C, the third zone is 170 °C, the fourth zone is 190 °C, the fifth to tenth zones are 190 °C, the head temperature is 190 °C, and the screw speed is 700 r / min.

[0111] Comparative Example 1

[0112] Compared with Example 1, the difference is that in this comparative example, high-rigidity homopolypropylene 6012 is used to replace the modified magnesium sulfate whisker A in equal proportion.

[0113] Comparative Example 2

[0114] Compared with Example 1, the difference is that in this comparative example, unmodified magnesium sulfate whisker WS-3D is used to replace the modified magnesium sulfate whisker A in equal proportion.

[0115] Comparative Example 3

[0116] Compared with Example 1, the difference is that in this comparative example, modified magnesium sulfate whisker D is used to replace the modified magnesium sulfate whisker A in equal proportion.

[0117] Comparative Example 4

[0118] Compared with Example 1, the difference is that in this comparative example, modified magnesium sulfate whisker E is used to replace the modified magnesium sulfate whisker A in equal proportion.

[0119] Comparative Example 5

[0120] Compared with Example 1, the difference is that in this comparative example, talc AH51205L is used to replace the modified magnesium sulfate whisker A in equal proportion.

[0121] Table 2 Performance of Examples 1-3 and Comparative Examples 1-5

[0122] Implementation Implementation Implementation Comparison Comparison Comparison Comparison Comparison HDT (0.45 Mpa) 98 96 92 90 98 98 98 94 Flexural Strength (MPa) 31 25 28 23 26 28 28 26 Flexural Modulus (MPa) 1440 1350 1300 988 1250 1310 1330 1300 Izod Notched Impact Strength 31 29 29.3 24 25.2 27.5 27 29 Transmittance - 3mm (%) 55 54 53 58 46 50 47 25 Transmittance - 2mm (%) 65 59 56 69 57 49 50 37

[0123] It can be seen from Examples 1-3 and Comparative Examples 1-4 that the introduction of modified magnesium sulfate whiskers can greatly improve the flexural modulus, notched Izod impact strength and HDT of the material, while having little impact on the reduction of the material's light transmittance. By comparing Example 1 with Comparative Examples 2-4, it can be seen that for the magnesium sulfate whiskers modified by the two-step method, when they are in the same content in the material, the flexural modulus, notched Izod impact strength, HDT and light transmittance of the material are relatively high, indicating that the dispersibility and compatibility with the matrix of the magnesium sulfate after two-step modification have been further improved. By comparing Example 1 with Comparative Example 5, it can be seen that for the same filling system, the modified magnesium sulfate whiskers have greatly improved the light transmittance of the material.

[0124] Although the specific embodiments of the present invention have been illustrated and described above, it will be obvious to those skilled in the art that many other modifications and variations can be made without departing from the essence and scope of the present invention. These modifications and variations are all within the scope of protection of the present invention.

Claims

1. A high light transmittance polypropylene material, characterized in that, the material is prepared from the following raw materials: 30 - 55% of high-rigidity homopolypropylene resin, 25 - 50% of random copolymer polypropylene resin, 5 - 10% of modified magnesium sulfate whiskers, 0.5 - 1.5% of transparent nucleating agent, 8 - 12% of toughening agent, 0.3 - 0.7% of stabilizer; wherein, the modified magnesium sulfate whiskers are magnesium sulfate whiskers modified by polyaspartic acid PASP and fatty acid.

2. The material according to claim 1, characterized in that, the high-rigidity homopolypropylene resin is a polypropylene resin with a melt mass flow rate of 5 - 100 g / 10 min at 230 °C and a 2.16 kg load, and the flexural modulus of the material > 1800 MPa.

3. The material according to claim 1 or 2, characterized in that, the random copolymer polypropylene resin is a polymer obtained by random copolymerization of propylene and ethylene, and has a melt mass flow rate of 1 - 10 g / 10 min at 230 °C and a 2.16 kg load.

4. The material according to any one of claims 1 - 3, characterized in that, the preparation method of the modified magnesium sulfate whiskers is: S1: Add magnesium sulfate whiskers to water for dispersion treatment, add polyaspartic acid, adjust the pH, and react to obtain a pre-dispersed magnesium sulfate whisker slurry; S2: Add the pre-dispersed magnesium sulfate whisker slurry to the dissolved fatty acid, react, filter, wash, and dry to obtain modified magnesium sulfate whiskers.

5. The material according to any one of claims 1 - 4, characterized in that, the addition amount of polyaspartic acid in S1 is 0.4 - 0.8% of the mass of magnesium sulfate whiskers; and / or, the aspect ratio of magnesium sulfate whiskers in S1 > 30, preferably the aspect ratio is 35 - 100; and / or, the dispersion treatment in S1 is ultrasonic treatment; preferably, the ultrasonic treatment time is 0.5 - 1 h; and / or, adjust the pH to 7 - 10 in S1; and / or, react at a temperature of 60 - 80 °C for 1 - 3 h in S1.

6. The material according to any one of claims 1 - 5, characterized in that, the mass ratio of fatty acid to magnesium sulfate whiskers in S2 is (0.3 - 0.7):

1. and / or, the fatty acid in S2 is one or more of lauric acid, palmitic acid, and stearic acid; and / or, the solvent in S2 is an alcohol with 2 - 5 carbon atoms, preferably ethanol; and / or, react at a temperature of 60 - 80 °C for 0.5 - 1.5 h in S2.

7. The material according to any one of claims 1 - 6, characterized in that, the transparent nucleating agent is one or more of carboxylic metal salt nucleating agents, sorbitol nucleating agents, and aryl phosphate nucleating agents; and / or, the toughening agent is one or more of vinyl-poly-diene-styrene block copolymers, styrene-ethylene-butadiene-styrene copolymers, ethylene-octene copolymers, and ethylene-butene copolymers; and / or, the stabilizer is an antioxidant and a light stabilizer; Preferably, the antioxidant is selected from one or more of hindered phenol antioxidants, hindered amine antioxidants, phosphite antioxidants, thiodipropionate antioxidants, and mercaptan antioxidants, preferably hindered phenol antioxidants and phosphite antioxidants; Preferably, the light stabilizer is selected from one or more of hindered amine light stabilizers, benzophenone light stabilizers, salicylate light stabilizers, and benzotriazole light stabilizers, preferably hindered amine light stabilizers; Preferably, the mass ratio of the hindered phenol antioxidant, the phosphite antioxidant, and the hindered amine light stabilizer is (0.1 - 0.3):(0.1 - 0.3):(0.1 - 0.2).

8. A method for preparing a high light transmittance polypropylene material, wherein the polypropylene material is the material described in any one of claims 1 - 7, characterized in that, the method is as follows: Mix high-rigidity homopolypropylene, random copolymer polypropylene resin, transparent nucleating agent, toughening agent, and stabilizer to obtain a premix, add the premix through the main feeding port of an extruder, add modified magnesium sulfate whiskers through the side feeding port of the extruder, extrude, cool, and pelletize to obtain a high light transmittance polypropylene material.

9. According to the method described in claim 8, characterized in that, the temperatures of each zone of the extruder and the screw speed during extrusion are respectively: the temperature of the first zone is 100 - 120 °C, the temperature of the second zone is 120 - 150 °C, the temperature of the third zone is 140 - 190 °C, the temperature of the fourth zone is 180 - 210 °C, the temperatures of the fifth to fifteenth zones are 190 - 220 °C, the temperature of the die head is 180 - 210 °C, and the screw speed is 500 - 800 r / min.

10. A use of a high light transmittance polypropylene material, wherein the polypropylene material is the material described in any one of claims 1 - 7, or the material prepared by the method described in claim 8 or 9, and the material is used in the field of automotive interior and exterior trims.

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