Modified PP (Polypropylene) for automobile exterior based on PCR (Polymerase Chain Reaction) plastic

Abstract

The invention discloses modified PP (polypropylene) for automobile exterior based on PCR (polymerase chain reaction) plastic, which is prepared from the following raw materials in parts: 30 to 50 parts of PCR plastic, 10 to 25 parts of PP plastic, 10 to 15 parts of filler, 1 to 10 parts of flexibilizer, 1 to 10 parts of antioxidant, 1 to 10 parts of ultraviolet light absorber, 1 to 10 parts of flame retardant, 1 to 10 parts of stabilizer and 1 to 10 parts of dispersant. The PCR plastic is PP recycled plastic, the PCR plastic is cleaned, the PCR plastic is put into the inner side of the stirring machine, the clear water and the disinfectant are added, the rotating speed of the stirring machine is increased to 180-200 revolutions per minute, crushing is conducted after cleaning is completed, the PCR plastic is put into the stirring machine, the rotating speed of the stirring machine is increased to 180-200 revolutions per minute, and crushing is conducted after cleaning is completed; according to the invention, the PCR plastic is cleaned and disinfected, so that bacteria on the PCR plastic can be effectively removed, and then the PCR plastic is subjected to negative pressure drying, so that heavier peculiar smell on the PCR plastic can be effectively removed, and the recycled PCR plastic does not affect the subsequent use of modified PP.

Description

Technical Field

[0001] The invention relates to the technical field of modified PP, and in particular to a modified PP for automobile exterior decoration based on PCR plastic. Background Art

[0002] PCR plastics (Post-Consumer Recycled Plastics) refer to plastic materials that have been recycled for reuse. The use of this material helps reduce plastic waste, reduces the demand for new plastics, and has a positive impact on the environment.

[0003] Modified polypropylene (modified PP) is a material that is modified by physical or chemical methods to improve the performance of polypropylene. Polypropylene itself has good chemical stability and mechanical strength, but in some applications it may be necessary to improve its impact resistance, heat resistance, fluidity or other properties.

[0004] The modified PP for automobile exterior based on PCR plastic in the prior art does not process the PCR plastic comprehensively, which may easily affect the performance of the modified PP. Therefore, the present invention proposes a modified PP for automobile exterior based on PCR plastic to solve the above problems. Summary of the invention

[0005] Based on the technical problems existing in the background technology, the present invention proposes a modified PP for automobile exterior based on PCR plastic.

[0006] The modified PP for automobile exterior based on PCR plastic proposed by the present invention comprises the following raw materials: 30-50 parts of PCR plastic, 10-25 parts of PP plastic, 10-15 parts of filler, 1-10 parts of toughening agent, 1-10 parts of antioxidant, 1-10 parts of ultraviolet absorber, 1-10 parts of flame retardant, 1-10 parts of stabilizer and 1-10 parts of dispersant.

[0007] Preferably, the PCR plastic is PP recycled plastic. The PCR plastic is cleaned, placed inside a blender, and clean water and disinfectant are added. The speed of the blender is increased to 180-200 revolutions per minute, and the plastic is crushed after cleaning.

[0008] Preferably, the crushed PCR plastic is added to the inner side of a negative pressure dryer for drying. The equipment parameters of the negative pressure dryer are -0.07 MPa and the temperature is 50-100 degrees Celsius. Under the negative pressure environment, the moisture of the material evaporates at a lower temperature, and many odorous substances (such as volatile organic compounds) can also be taken away in the process, thereby reducing the presence of odor. Negative pressure can promote air flow and help to more effectively remove odor molecules, especially in a closed drying system.

[0009] Preferably, the filler is calcium carbonate and talcum powder, and the ratio of calcium carbonate to talcum powder is 2:1. The filler is an additive used to enhance the performance of plastic materials and reduce production costs, and can improve the mechanical properties, thermal stability, fluidity and other physical properties of plastics.

[0010] Preferably, the toughening agent is a mixture of polypropylene, polyolefin elastomer and polyurethane in a ratio of 2-4:3-9:1-5; the antioxidant is a mixture of high-density polyethylene, polyvinyl chloride and dioctyl dinitride in a ratio of 3-8:1-6:2-7; the toughening agent is an additive used to improve the toughness of materials, and they improve the toughness and brittleness resistance of materials by changing the microstructure of materials or enhancing the impact resistance of materials; antioxidants are a class of chemicals used to delay or prevent aging and degradation of plastics caused by factors such as light, heat and oxygen during processing and use; they can significantly extend the service life of plastic products and maintain the stability of their physical and chemical properties.

[0011] Preferably, the ultraviolet absorber is a mixture of polycarbonate, bisphenyl ketone and benzotriazole in a ratio of 3-8:1-8:2-8, and the flame retardant is a mixture of triphenyl phosphate, triphenyl phosphate and polyethylene terephthalate in a ratio of 3-9:3-9:1-7. The ultraviolet absorber is a class of chemical substances that can absorb ultraviolet radiation and convert it into other forms of energy (such as heat) to protect PP plastics from ultraviolet damage and extend the service life of PP plastics. Flame retardants are a class of chemical substances used to reduce or delay the combustion of materials. Their main function is to improve the flame retardant properties of materials and prevent fires.

[0012] Preferably, the stabilizer is a mixture of phosphite, organotin compound and phthalate, and the ratio is 1-3:2-5:6-7; the dispersant is a mixture of fatty acid ester, polyether and polyvinyl alcohol, and the ratio is 1-8:2-7:4-7, to protect personal safety and property safety. Stabilizers are a class of compounds used to improve the stability of substances, maintain their physical and chemical properties, and extend the shelf life of products. Dispersants are a class of additives used to improve the dispersion stability of liquid or solid particles in the medium. They prevent the sedimentation, aggregation or flocculation of particles by reducing the mutual attraction between particles and increasing the interaction between particles and the medium.

[0013] Preferably, PCR plastic, PP plastic and filler are placed in a blender at a temperature of 50-70 degrees Celsius and a rotation speed of 90-120 revolutions per minute. After stirring for 10-15 minutes, toughening agent, antioxidant, UV absorber, flame retardant, stabilizer, dispersant and toughening agent are added to the inner side of the blender, the temperature is increased to 80-120 degrees Celsius, the rotation speed is increased to 100-180 revolutions per minute, and the modified PP plastic is obtained after stirring for 20-25 minutes.

[0014] Beneficial effects of the present invention:

[0015] The present invention can effectively remove bacteria on the PCR plastic by cleaning and disinfecting the PCR plastic, and then negative pressure drying the PCR plastic can effectively remove the heavier odor on the PCR plastic, so that the recycled PCR plastic will not affect the subsequent use of the modified PP. DETAILED DESCRIPTION

[0016] The present invention will be further explained below in conjunction with specific embodiments.

[0017] Embodiment 1

[0018] In this embodiment, a modified PP for automobile exterior decoration based on PCR plastic is proposed, which includes the following raw materials: 34 parts of PCR plastic, 15 parts of PP plastic, 10 parts of filler, 5 parts of toughening agent, 7 parts of antioxidant, 8 parts of ultraviolet absorber, 6 parts of flame retardant, 8 parts of stabilizer and 7 parts of dispersant. The PCR plastic is PP recycled plastic. The PCR plastic is cleaned and put into the inner side of the blender, and clean water and disinfectant are added. The speed of the blender is increased to 180 revolutions per minute. After cleaning, the plastic is crushed. The crushed PCR plastic is added into the inner side of the negative pressure dryer for drying. The equipment parameter of the negative pressure dryer is -0.07 MPa, temperature is 70 degrees Celsius, filler is calcium carbonate and talc, the ratio of calcium carbonate to talc is 2:1, toughening agent is a mixture of polypropylene, polyolefin elastomer and polyurethane, the ratio is 2:3:1, antioxidant is a mixture of high-density polyethylene, polyvinyl chloride and dioctyl dinitrile, the ratio is 3:1:2, UV absorber is a mixture of polycarbonate, bisphenyl ketone and benzotriazole, the ratio is 3:1:2, flame retardant is a mixture of triphenyl phosphate, triphenyl phosphate and polyethylene terephthalate, the ratio is 3:3:1, stabilizer is a mixture of phosphite, organic tin compound and phthalate, the ratio is 1:2:6, The powder is made by mixing fatty acid ester, polyether and polyvinyl alcohol in a ratio of 1:2:4. Put PCR plastic, PP plastic and filler into a blender at a temperature of 50 degrees Celsius and a speed of 90 revolutions per minute. After stirring for 10 minutes, add toughening agent, antioxidant, UV absorber, flame retardant, stabilizer, dispersant and toughening agent to the inside of the blender, raise the temperature to 80 degrees Celsius, increase the speed to 100-180 revolutions per minute, and stir for 20 minutes to obtain modified PP plastic. Under negative pressure, the moisture of the material evaporates at a lower temperature, and many odor substances (such as volatile organic compounds) can also be taken away in the process, thereby reducing the presence of odor. Negative pressure can promote air Flow, help to more effectively remove odor molecules, especially in closed drying systems. Fillers are additives used to enhance the performance of plastic materials and reduce production costs. They can improve the mechanical properties, thermal stability, fluidity and other physical properties of plastics. Tougheners are additives used to improve the toughness of materials. They improve the toughness and brittleness of materials by changing the microstructure of materials or enhancing the impact resistance of materials. UV absorbers are a class of chemicals that can absorb ultraviolet radiation and convert it into other forms of energy (such as heat) to protect PP plastics from ultraviolet damage and extend the service life of PP plastics. Dispersants are a class of chemicals used to improve the dispersion and stability of liquid or solid particles in the medium. Antioxidants are chemical substances used to delay or prevent the aging and degradation of plastics caused by factors such as light, heat and oxygen during processing and use. They can significantly extend the service life of plastic products and maintain the stability of their physical and chemical properties. Flame retardants are chemical substances used to reduce or delay the combustion of materials. Their main function is to improve the flame retardant properties of materials, prevent fires, and protect personal and property safety. Stabilizers are compounds used to improve the stability of materials, maintain their physical and chemical properties, and extend the shelf life of products.

[0019] Embodiment 2

[0020] In this embodiment, a modified PP for automobile exterior decoration based on PCR plastic is proposed, which includes the following raw materials: 43 parts of PCR plastic, 20 parts of PP plastic, 12 parts of filler, 5 parts of toughening agent, 3 parts of antioxidant, 8 parts of ultraviolet absorber, 4 parts of flame retardant, 3 parts of stabilizer and 5 parts of dispersant. The PCR plastic is PP recycled plastic. The PCR plastic is cleaned and put into the inner side of the blender, and clean water and disinfectant are added. The speed of the blender is increased to 185 revolutions per minute. After cleaning, the plastic is crushed. The crushed PCR plastic is added into the inner side of the negative pressure dryer for drying. The equipment parameter of the negative pressure dryer is -0.07 MPa, the temperature is 75 degrees Celsius, the filler is calcium carbonate and talc, the ratio of calcium carbonate to talc is 2:1, the toughening agent is a mixture of polypropylene, polyolefin elastomer and polyurethane, the ratio is 3:5:3, the antioxidant is a mixture of high-density polyethylene, polyvinyl chloride and dioctyl dinitrile, the ratio is 5:4:5, the ultraviolet absorber is a mixture of polycarbonate, bisphenyl ketone and benzotriazole, the ratio is 3-8:1-8:2-8, the flame retardant is a mixture of triphenyl phosphate, triphenyl phosphate and polyethylene terephthalate, the ratio is 6:7:1-7, the stabilizer is a mixture of phosphite, organic tin compound and phthalate, the ratio is 2: 3:6, the dispersant is a mixture of fatty acid ester, polyether and polyvinyl alcohol in a ratio of 4:3:5. Put PCR plastic, PP plastic and filler into a blender at a temperature of 50-70 degrees Celsius and a speed of 100 revolutions per minute. After stirring for 12 minutes, add toughening agent, antioxidant, UV absorber, flame retardant, stabilizer, dispersant and toughening agent to the inside of the blender, increase the temperature to 110 degrees Celsius, increase the speed to 160 revolutions per minute, and stir for 20 minutes to obtain modified PP plastic. Under negative pressure, the moisture of the material evaporates at a lower temperature, and many odor substances (such as volatile organic compounds) can also be taken away in the process, thereby reducing the presence of odor. Negative pressure can promote The flow of incoming air helps to more effectively remove odor molecules, especially in a closed drying system. Fillers are additives used to enhance the performance of plastic materials and reduce production costs. They can improve the mechanical properties, thermal stability, fluidity and other physical properties of plastics. Tougheners are additives used to improve the toughness of materials. They improve the toughness and brittleness of materials by changing the microstructure of materials or enhancing the impact resistance of materials. UV absorbers are a class of chemicals that can absorb ultraviolet radiation and convert it into other forms of energy (such as heat) to protect PP plastics from ultraviolet damage and extend the service life of PP plastics. Dispersants are a class of chemicals used to improve the dispersion of liquid or solid particles in the medium. Stability additives, they prevent the sedimentation, aggregation or flocculation of particles by reducing the mutual attraction between particles and increasing the interaction between particles and the medium. Antioxidants are a class of chemicals used to delay or prevent the aging and degradation of plastics caused by factors such as light, heat and oxygen during processing and use. They can significantly extend the service life of plastic products and maintain the stability of their physical and chemical properties. Flame retardants are a class of chemicals used to reduce or delay the combustion of materials. Their main function is to improve the flame retardant properties of materials, prevent fires, and protect personal and property safety. Stabilizers are a class of compounds used to improve the stability of materials, maintain their physical and chemical properties, and extend the shelf life of products. .

[0021] Embodiment 3

[0022] In this embodiment, a modified PP for automobile exterior decoration based on PCR plastic is proposed, which includes the following raw materials: 35 parts of PCR plastic, 15 parts of PP plastic, 13 parts of filler, 7 parts of toughening agent, 6 parts of antioxidant, 5 parts of ultraviolet absorber, 6 parts of flame retardant, 5 parts of stabilizer and 8 parts of dispersant. The PCR plastic is PP recycled plastic. The PCR plastic is cleaned and put into the inner side of the blender, and clean water and disinfectant are added. The speed of the blender is increased to 190 revolutions per minute. After cleaning, the plastic is crushed. The crushed PCR plastic is added into the inner side of the negative pressure dryer for drying. The equipment parameter of the negative pressure dryer is -0.07 MPa, the temperature is 70 degrees Celsius, the filler is calcium carbonate and talc, the ratio of calcium carbonate to talc is 2:1, the toughening agent is a mixture of polypropylene, polyolefin elastomer and polyurethane, the ratio is 3:6:2, the antioxidant is a mixture of high-density polyethylene, polyvinyl chloride and dioctyl dinitrile, the ratio is 4:5:5, the ultraviolet absorber is a mixture of polycarbonate, bisphenyl ketone and benzotriazole, the ratio is 3-8:1-8:2-8, the flame retardant is a mixture of triphenyl phosphate, triphenyl phosphate and polyethylene terephthalate, the ratio is 5:6:2, and the stabilizer is a mixture of phosphite, organic tin compound and phthalate, the ratio is 2: 3:6, the dispersant is a mixture of fatty acid ester, polyether and polyvinyl alcohol in a ratio of 5:3:5. Put PCR plastic, PP plastic and filler into the blender at a temperature of 65 degrees Celsius and a speed of 100 revolutions per minute. After stirring for 13 minutes, add toughening agent, antioxidant, UV absorber, flame retardant, stabilizer, dispersant and toughening agent to the inside of the blender, raise the temperature to 95 degrees Celsius, increase the speed to 150 revolutions per minute, and stir for 23 minutes to obtain modified PP plastic. Under negative pressure, the moisture of the material evaporates at a lower temperature, and many odor substances (such as volatile organic compounds) can also be taken away in the process, thereby reducing the presence of odor. Negative pressure can promote air The flow of plastic helps to more effectively remove odor molecules, especially in a closed drying system. Fillers are additives used to enhance the performance of plastic materials and reduce production costs. They can improve the mechanical properties, thermal stability, fluidity and other physical properties of plastics. Tougheners are additives used to improve the toughness of materials. They improve the toughness and brittleness of materials by changing the microstructure of the material or enhancing the impact resistance of the material. UV absorbers are chemicals that can absorb ultraviolet radiation and convert it into other forms of energy (such as heat) to protect PP plastics from ultraviolet damage and extend the service life of PP plastics. Dispersants are a type of chemical used to improve the dispersion stability of liquid or solid particles in the medium. Qualitative additives, they prevent the sedimentation, aggregation or flocculation of particles by reducing the mutual attraction between particles and increasing the interaction between particles and the medium. Antioxidants are a class of chemicals used to delay or prevent the aging and degradation of plastics caused by factors such as light, heat and oxygen during processing and use. They can significantly extend the service life of plastic products and maintain the stability of their physical and chemical properties. Flame retardants are a class of chemicals used to reduce or delay the combustion of materials. Their main function is to improve the flame retardant properties of materials, prevent fires, and protect personal and property safety. Stabilizers are a class of compounds used to improve the stability of materials, maintain their physical and chemical properties, and extend the shelf life of products. .

[0023] Embodiment 4

[0024] In this embodiment, a modified PP for automobile exterior based on PCR plastic is proposed, which includes the following raw materials: 44 parts of PCR plastic, 10 parts of PP plastic, 10 parts of filler, 8 parts of toughening agent, 3 parts of antioxidant, 7 parts of ultraviolet absorber, 4 parts of flame retardant, 6 parts of stabilizer and 8 parts of dispersant. The PCR plastic is PP recycled plastic. The PCR plastic is cleaned and put into the inner side of the blender, and clean water and disinfectant are added. The speed of the blender is increased to 180-200 revolutions per minute. After cleaning, the plastic is crushed. The crushed PCR plastic is added into the inner side of the negative pressure dryer for drying. The equipment parameter of the negative pressure dryer is -0.07 MPa, temperature is 50-100 degrees Celsius, filler is calcium carbonate and talc, the ratio of calcium carbonate to talc is 2:1, toughening agent is a mixture of polypropylene, polyolefin elastomer and polyurethane, the ratio is 3:5:3, antioxidant is a mixture of high-density polyethylene, polyvinyl chloride and dioctyl dinitrile, the ratio is 6:2:5, ultraviolet absorber is a mixture of polycarbonate, bisphenyl ketone and benzotriazole, the ratio is 6:3:4, flame retardant is a mixture of triphenyl phosphate, triphenyl phosphate and polyethylene terephthalate, the ratio is 4:5:2, stabilizer is a mixture of phosphite, organic tin compound and phthalate, the ratio is 2:4: 7. The dispersant is a mixture of fatty acid ester, polyether and polyvinyl alcohol in a ratio of 2:6:5. PCR plastic, PP plastic and filler are placed in a blender at a temperature of 55 degrees Celsius and a speed of 115 rpm. After stirring for 13 minutes, toughening agent, antioxidant, UV absorber, flame retardant, stabilizer, dispersant and toughening agent are added to the inner side of the blender. The temperature is raised to 105 degrees Celsius and the speed is raised to 135 rpm. After stirring for 22 minutes, the modified PP plastic is obtained. Under negative pressure, the moisture of the material evaporates at a lower temperature, and many odor substances (such as volatile organic compounds) can also be taken away in the process, thereby reducing the presence of odor. Negative pressure can promote air The flow of plastic helps to more effectively remove odor molecules, especially in a closed drying system. Fillers are additives used to enhance the performance of plastic materials and reduce production costs. They can improve the mechanical properties, thermal stability, fluidity and other physical properties of plastics. Tougheners are additives used to improve the toughness of materials. They improve the toughness and brittleness of materials by changing the microstructure of the material or enhancing the impact resistance of the material. UV absorbers are chemicals that can absorb ultraviolet radiation and convert it into other forms of energy (such as heat) to protect PP plastics from ultraviolet damage and extend the service life of PP plastics. Dispersants are a type of chemical used to improve the dispersion stability of liquid or solid particles in the medium. Qualitative additives, they prevent the sedimentation, aggregation or flocculation of particles by reducing the mutual attraction between particles and increasing the interaction between particles and the medium. Antioxidants are a class of chemicals used to delay or prevent the aging and degradation of plastics caused by factors such as light, heat and oxygen during processing and use. They can significantly extend the service life of plastic products and maintain the stability of their physical and chemical properties. Flame retardants are a class of chemicals used to reduce or delay the combustion of materials. Their main function is to improve the flame retardant properties of materials, prevent fires, and protect personal and property safety. Stabilizers are a class of compounds used to improve the stability of materials, maintain their physical and chemical properties, and extend the shelf life of products. .

[0025] Embodiment 5

[0026] In this embodiment, a modified PP for automobile exterior decoration based on PCR plastic is proposed, which includes the following raw materials: 43 parts of PCR plastic, 16 parts of PP plastic, 13 parts of filler, 2 parts of toughening agent, 3 parts of antioxidant, 7 parts of ultraviolet absorber, 4 parts of flame retardant, 3 parts of stabilizer and 9 parts of dispersant. The PCR plastic is PP recycled plastic. The PCR plastic is cleaned and put into the inner side of the blender, and clean water and disinfectant are added. The speed of the blender is increased to 200 revolutions per minute. After cleaning, the plastic is crushed, and the crushed PCR plastic is added into the inner side of the negative pressure dryer for drying. The equipment parameter of the negative pressure dryer is -0.07 MPa, temperature is 100 degrees Celsius, filler is calcium carbonate and talc, the ratio of calcium carbonate to talc is 2:1, toughening agent is a mixture of polypropylene, polyolefin elastomer and polyurethane, the ratio is 4:9:5, antioxidant is a mixture of high-density polyethylene, polyvinyl chloride and dioctyl dinitrile, the ratio is 8:6:7, UV absorber is a mixture of polycarbonate, bisphenyl ketone and benzotriazole, the ratio is 8:8:8, flame retardant is a mixture of triphenyl phosphate, triphenyl phosphate and polyethylene terephthalate, the ratio is 9:9:7, stabilizer is a mixture of phosphite, organic tin compound and phthalate, the ratio is 3:5:7, The dispersant is a mixture of fatty acid ester, polyether and polyvinyl alcohol in a ratio of 8:7:7. PCR plastic, PP plastic and filler are put into a blender at a temperature of 70 degrees Celsius and a speed of 120 revolutions per minute. After stirring for 15 minutes, toughening agent, antioxidant, UV absorber, flame retardant, stabilizer, dispersant and toughening agent are added to the inner side of the blender. The temperature is raised to 120 degrees Celsius and the speed is raised to 180 revolutions per minute. After stirring for 25 minutes, modified PP plastic is obtained. Under negative pressure, the moisture of the material evaporates at a lower temperature, and many odor substances (such as volatile organic compounds) can also be taken away in the process, thereby reducing the presence of odor. Negative pressure can promote air flow. It helps to remove odor molecules more effectively, especially in closed drying systems. Fillers are additives used to enhance the performance of plastic materials and reduce production costs. They can improve the mechanical properties, thermal stability, fluidity and other physical properties of plastics. Tougheners are additives used to improve the toughness of materials. They improve the toughness and brittleness of materials by changing the microstructure of materials or enhancing the impact resistance of materials. UV absorbers are a class of chemicals that can absorb ultraviolet radiation and convert it into other forms of energy (such as heat) to protect PP plastics from ultraviolet damage and extend the service life of PP plastics. Dispersants are a class of chemicals used to improve the dispersion and stability of liquid or solid particles in the medium. Antioxidants are chemical substances used to delay or prevent the aging and degradation of plastics caused by factors such as light, heat and oxygen during processing and use. They can significantly extend the service life of plastic products and maintain the stability of their physical and chemical properties. Flame retardants are chemical substances used to reduce or delay the combustion of materials. Their main function is to improve the flame retardant properties of materials, prevent fires, and protect personal and property safety. Stabilizers are compounds used to improve the stability of materials, maintain their physical and chemical properties, and extend the shelf life of products.

[0027] Comparing conventional modified PP with the modified PP prepared in Examples 1 to 5, the modified PP prepared in Examples 1 to 5 are shown in the following table:

[0028] Example one two three Four five Bacteria reduction 79％ 82％ 81％ 86％ 85％ Odor reduction 83％ 80％ 81％ 85％ 87％ Performance Improvements 30％ 32％ 29％ 30％ 35％

[0029] It can be seen from the above table that the modified PP for automobile exterior based on PCR plastic proposed in the present invention has obvious improvement, and implementation five is the best embodiment.

[0030] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. Modified PP for automotive exterior based on PCR plastic, characterized in that: The raw materials include the following parts: 30-50 parts of PCR plastic, 10-25 parts of PP plastic, 10-15 parts of filler, 1-10 parts of toughening agent, 1-10 parts of antioxidant, 1-10 parts of UV absorber, 1-10 parts of flame retardant, 1-10 parts of stabilizer and 1-10 parts of dispersant.

2. The modified PP for automobile exterior based on PCR plastic according to claim 1, characterized in that: The PCR plastic is PP recycled plastic. The PCR plastic is cleaned and placed inside a blender. Clean water and disinfectant are added. The speed of the blender is increased to 180-200 revolutions per minute. After cleaning, the plastic is crushed.

3. The modified PP for automobile exterior based on PCR plastic according to claim 1, characterized in that: Add the crushed PCR plastic to the inside of the negative pressure dryer for drying. The equipment parameters of the negative pressure dryer are -0.07 MPa and the temperature is 50-100 degrees Celsius.

4. The modified PP for automobile exterior based on PCR plastic according to claim 1, characterized in that: The fillers are calcium carbonate and talcum powder, and the ratio of calcium carbonate to talcum powder is 2:

1.

5. The modified PP for automobile exterior based on PCR plastic according to claim 1, characterized in that: The toughening agent is prepared by mixing polypropylene, polyolefin elastomer and polyurethane in a ratio of 2-4:3-9:1-5. The antioxidant is prepared by mixing high-density polyethylene, polyvinyl chloride and dioctyl dinitride in a ratio of 3-8:1-6:2-7.

6. The modified PP for automobile exterior based on PCR plastic according to claim 1, characterized in that: The ultraviolet absorber is prepared by mixing polycarbonate, bisphenyl ketone and benzotriazole in a ratio of 3-8:1-8:2-8. The flame retardant is prepared by mixing triphenyl phosphate, triphenyl phosphate and polyethylene terephthalate in a ratio of 3-9:3-9:1-7.

7. The modified PP for automobile exterior based on PCR plastic according to claim 1, characterized in that: The stabilizer is prepared by mixing phosphite, organic tin compound and phthalate in a ratio of 1-3:2-5:6-7. The dispersant is prepared by mixing fatty acid ester, polyether and polyvinyl alcohol in a ratio of 1-8:2-7:4-7.

8. The modified PP for automobile exterior based on PCR plastic according to claim 1, characterized in that: Put PCR plastic, PP plastic and filler into a blender at a temperature of 50-70 degrees Celsius and a speed of 90-120 revolutions per minute. After stirring for 10-15 minutes, add toughening agent, antioxidant, UV absorber, flame retardant, stabilizer, dispersant and toughening agent to the inside of the blender, increase the temperature to 80-120 degrees Celsius, increase the speed to 100-180 revolutions per minute, and stir for 20-25 minutes to obtain modified PP plastic.