Preparation method of high-brightness black spraying-free PMMA / ASA material and preparation method of high-brightness black spraying-free PMMA / ASA material

Abstract

The invention discloses a preparation method of a high-brightness-black spraying-free PMMA / ASA material and a method thereof, and relates to the technical field of automobile material production, and the high-brightness-black spraying-free PMMA / ASA material is prepared from the following raw materials: polymethyl methacrylate, a toughening agent, an antioxidant, a light stabilizer, color master batch, an ultraviolet absorbent, a lubricant and a scratch-resistant agent.The high-brightness-black spraying-free PMMA / ASA material is prepared by adding the toughening agent, adding the antioxidant, the light stabilizer, the color master batch, the ultraviolet absorbent, the lubricant and the scratch-resistant agent. The toughening agent can form an elastic buffer structure inside the material, effectively improves impact strength, does not affect light transmittance, further improves toughness of the material, has excellent weather resistance and good processability, can improve scratch resistance of the material, maintains light transmittance and surface gloss, improves weather resistance, further improves applicability of the material, and has good application prospects. The polymethyl methacrylate is moderate in fluidity, so that the material can fully flow in the equipment during processing, the forming quality of the material during processing is further improved, the plumpness of a finished product is improved, the material is suitable for a product with a complex structure, and the practicability of the material is further improved.

Description

Technical Field

[0001] This application relates to the field of automotive material production technology, and in particular to the preparation and method of a high-gloss black paint-free PMMA / ASA material. Background Technology

[0002] PMMA / ASA material is a polymer material formed by blending and modifying polymethyl methacrylate and acrylate-styrene-acrylonitrile copolymer. It combines the high transparency and high gloss of PMMA with the excellent weather resistance and impact resistance of ASA. Furthermore, by adding color masterbatch and additives, it can achieve paint-free characteristics, presenting a high-gloss appearance without subsequent painting. With these advantages, this material is widely used in fields with high requirements for appearance and weather resistance, such as automotive exterior parts, home appliance housings, and outdoor decorative parts. It can resist ultraviolet rays and rain erosion for a long time and maintain a stable appearance.

[0003] When manufacturing automotive parts from PMMA / ASA materials, the first step is to pre-treat the PMMA / ASA granules for molding. The granules are dried with hot air at 80-90℃ for 2-4 hours to remove moisture and prevent bubbles or silver streaks during injection molding. Then, the dried granules are added to an injection molding machine, and a temperature gradient is set according to the material's properties. After melting and plasticizing through a screw, the melt is injected under high pressure into a customized automotive part mold. Once the melt has cooled and solidified in the mold, the mold is opened, the part is removed, and after minor deburring and visual inspection, a paint-free automotive part is obtained. The entire process meets the requirements of efficient and environmentally friendly production.

[0004] The existing Chinese patent (authorization announcement number: CN112552614B) mentions a high-gloss black scratch-resistant PMMA / ASA composite material and its preparation method, comprising the following raw materials in parts by weight: SAN resin: 25-60 parts, toughening agent: 5-15 parts, PMMA resin: 15-35 parts, heat resistant agent: 5-15 parts, inorganic nanoparticles: 1-10 parts, additives: 1-5 parts, and colorant: 1-5 parts; wherein the melt index of the PMMA resin is 1-5 g / 10 at 230°C / 3.8 kg. The inorganic nanoparticles are nano-sized compounds of tungsten and sulfur, with the chemical formula WS2 and an average particle size of 60-120 nm. The colorant comprises the following components by weight: 1350.5 parts solvent red, 1790.4 parts solvent red, 1040.6 parts solvent blue, and 1140.7 parts solvent yellow; or 1350.4 parts solvent red, 1790.4 parts solvent red, 1040.5 parts solvent blue, and 1140.6 parts solvent yellow; or 1350.7 parts solvent red, 1790.4 parts solvent red, 1040.5 parts solvent blue, and 1140.6 parts solvent yellow. Solvent Red 1790.8 parts, Solvent Green 31.2 parts; or Solvent Red 1350.7 parts, Solvent Red 1791 parts, Solvent Green 31.4 parts; or Solvent Red 1351 parts, Solvent Blue 1040.3 parts, Solvent Yellow 1140.2 parts, Solvent Green 30.6 parts; or Solvent Red 1350.5 parts, Solvent Red 1790.6 parts, Solvent Blue 1040.4 parts, Solvent Yellow 1140.2 parts, Solvent Green 30.5 parts; or Solvent Red 1350.4 parts, Solvent Red 1790.4 parts, Solvent Blue 1040.3 parts, Solvent Yellow 114 0.2 parts, solvent orange 1160.5 parts, solvent green 30.5 parts; or solvent blue 1040.6 parts, solvent orange 1160.7 parts, solvent green 30.6 parts. By adding organic coloring compound solvents, the surface of the material can be made high-gloss black, avoiding the decrease in gloss caused by the introduction of carbon black. Inorganic tungsten disulfide nanorods are used to improve surface polarity, reduce the surface friction coefficient, and improve its scratch resistance. The process of PMMA / ASA composite material is simple, which can solve the problem of high gloss black, avoid the problem of material spraying and improve environmental pollution, and is suitable for large-scale mass production.

[0005] Existing materials, such as PMMA, have excellent scratch resistance, good gloss and light transmittance, but poor toughness and are difficult to process. As a result, the automotive parts produced have poor toughness, weak impact resistance, and are prone to brittleness, which leads to a shorter lifespan for the automotive parts. Summary of the Invention

[0006] The purpose of this application is to address the problem mentioned in the background art that existing materials, such as PMMA, have excellent scratch resistance, good gloss and light transmittance, but poor toughness and are difficult to process, resulting in poor toughness, weak impact resistance, and easy cracking of automotive parts after processing, thus leading to a short lifespan for automotive parts. This application provides a method for preparing a high-gloss black paint-free PMMA / ASA material.

[0007] To achieve the above objectives, this application specifically adopts the following technical solution: A high-gloss black, paint-free PMMA / ASA material is prepared from the following raw materials: polymethyl methacrylate, toughening agent, antioxidant, light stabilizer, color masterbatch, ultraviolet absorber, lubricant, and scratch resistant agent. The antioxidant accounts for 0.2% to 0.4% of the total raw materials, the polymethyl methacrylate accounts for 40% to 70% of the total raw materials, the toughening agent accounts for 30% to 35% of the total raw materials, the lubricant accounts for 0.3% of the total raw materials, the color masterbatch accounts for 2.5% to 3% of the total raw materials, and the light stabilizer and ultraviolet absorber each account for 0.2% to 0.3% of the total raw materials.

[0008] By adopting the above technical solution and adding toughening agents, an elastic buffer structure can be formed inside the material, which can effectively improve the impact strength without affecting the light transmittance. This further improves the toughness of the material. In addition, the toughening agents have excellent weather resistance and good processing performance, which can improve the scratch resistance of the material while maintaining the light transmittance and surface gloss, thus improving the weather resistance and further enhancing the applicability of the material.

[0009] The main material of this product is polymethyl methacrylate (PMMA), which has moderate fluidity. This allows the material to flow fully within the equipment during processing, thereby improving the molding quality and the fullness of the finished product. This makes the material suitable for complex structural products, thus enhancing its practicality.

[0010] Through the synergistic design of polymethyl methacrylate, masterbatch and additives, a high-gloss black effect can be achieved in a single injection molding process. This not only reduces emissions from the spraying process, but also avoids the risk of coating aging and peeling. The appearance consistency of the product can still be maintained after long-term use, further improving the practicality of the material.

[0011] Furthermore, the antioxidant includes a primary antioxidant and a secondary antioxidant, each accounting for 0.1% to 0.2% of the total raw materials.

[0012] By adopting the above technical solution, the material contains a primary antioxidant and an auxiliary antioxidant. The combination of the two, under their synergistic effect, significantly improves the material's resistance to thermal and oxygen aging, making it less prone to yellowing and embrittlement during long-term use. Furthermore, the addition of light stabilizers and ultraviolet absorbers further enhances its thermal and oxygen resistance and preserves its luster, thereby further extending the material's service life.

[0013] Furthermore, the primary antioxidant is a hindered phenolic antioxidant, and the secondary antioxidant is a phosphite secondary antioxidant.

[0014] By adopting the above technical solution, hindered phenolic antioxidants can capture free radicals generated during processing or high-temperature use, while phosphite-based auxiliary antioxidants can decompose hydrogen peroxides and prevent further generation of free radicals. Under the synergistic effect of the two, the thermal and oxygen aging resistance of the material is significantly improved, making the material less prone to yellowing and embrittlement during long-term use. Furthermore, the combination of light stabilizers and ultraviolet absorbers further improves the thermal and oxygen durability and retains the luster.

[0015] Furthermore, the toughening agent is a transparent acrylate rubber.

[0016] By adopting the above technical solution, the toughening agent in the material is selected as transparent acrylic rubber. The rubber can form an elastic buffer structure inside the material, which can effectively improve the impact strength. At the same time, the transparent rubber will not block the light, ensuring that the high gloss black appearance is not affected after toughening.

[0017] Furthermore, the lubricant is a modified alkyd ester lubricant, and the lubricant accounts for 0.3% of the total raw materials.

[0018] By adopting the above technical solution, the lubricant used in the material is a modified alkyd ester lubricant, which has excellent compatibility with polymethyl methacrylate. After processing, it will not precipitate onto the surface of the product like traditional stearic acid lubricants, reducing material degradation caused by shear overheating during processing and further ensuring the appearance and performance stability of the product.

[0019] Furthermore, the masterbatch is a high-concentration masterbatch.

[0020] By adopting the above technical solution, the high-concentration masterbatch contains 20% to 25% organic dye. The high-concentration masterbatch has excellent compatibility with transparent acrylic rubber, reducing the problem of pigment agglomeration and uneven color caused by poor compatibility. In addition, the 20% to 25% high-concentration organic dye can reduce the amount of masterbatch added, further reducing the risk of uneven pigment dispersion and ensuring that the black surface of the product is uniform and consistent, without local color difference or mottled phenomenon.

[0021] A method for preparing a high-gloss black, spray-free PMMA / ASA material includes the following steps: S1: First, the polymethyl methacrylate, toughening agent, color masterbatch, scratch-resistant agent and various additives are dried to remove moisture from the raw materials and the raw materials are pretreated for later use. S2: Then, the various raw materials are weighed in proportion using a high-precision electronic scale, and then the weighed raw materials are put into a high-speed mixer for mixing to obtain a mixed powder. S3: The mixed powder is then placed into a co-rotating twin-screw extruder for melt blending and granulation. During this process, the temperature of the feeding section of the co-rotating twin-screw extruder is 160-180℃, the temperature of the compression section is 190-210℃, the temperature of the homogenization section is 210-230℃, the die temperature is 220-230℃, and the screw speed is 300-400 r / min. The extruded melt is water-cooled and shaped, and then the shaped granules are placed in a dryer to remove surface moisture, thereby preparing the material. S4: The produced materials are randomly sampled by a sampler, and the sampled materials are processed into parts by a fully hydraulic injection molding machine; S5: The processed parts are tested using a universal tensile testing machine, a plastic pendulum impact testing machine, and a heat distortion Vicat testing machine to verify whether the materials are qualified.

[0022] In summary, this application includes at least one of the following beneficial effects; 1. In this application, the addition of a toughening agent can form an elastic buffer structure inside the material, effectively improving the impact strength without affecting the light transmittance, further improving the toughness of the material. Moreover, the toughening agent has excellent weather resistance and good processing performance, which can improve the scratch resistance of the material while maintaining the light transmittance and surface gloss, thus improving the weather resistance and further enhancing the practicality of the material.

[0023] 2. In this application, the material contains a primary antioxidant and an auxiliary antioxidant. The combination of the two, under their synergistic effect, significantly improves the material's resistance to heat and oxidation aging, making the material less prone to yellowing and embrittlement during long-term use. Furthermore, the addition of light stabilizers and ultraviolet absorbers further enhances its heat and oxidation resistance and preserves its luster, thereby further extending the material's service life.

[0024] 3. In this application, the main material of this material is polymethyl methacrylate, which has moderate fluidity, allowing the material to flow fully within the equipment during processing, thereby improving the molding quality during material processing, increasing the fullness of the finished product, making the material suitable for complex structural products, and thus improving the practicality of the material.

[0025] 4. In this application, the material achieves a high-gloss black effect in a single injection molding process through the synergistic design of polymethyl methacrylate, masterbatch and additives. This not only reduces emissions from the spraying process, but also avoids the risk of coating aging and peeling. The appearance of the product can still be maintained after long-term use, further improving the practicality of the material. Detailed Implementation

[0026] This application discloses a method for preparing a high-gloss black, paint-free PMMA / ASA material.

[0027] The preparation of a high-gloss black paint-free PMMA / ASA material comprises the following raw materials: polymethyl methacrylate, toughening agent, antioxidant, light stabilizer, color masterbatch, ultraviolet absorber, lubricant, and scratch resistant agent. The antioxidant includes a primary antioxidant and a secondary antioxidant. The primary antioxidant is a hindered phenolic antioxidant, and the secondary antioxidant is a phosphite-based secondary antioxidant. The primary antioxidant and the secondary antioxidant each account for 0.1% to 0.2% of the total raw materials, and polymethyl methacrylate accounts for 40% to 70% of the total raw materials.

[0028] The main material is polymethyl methacrylate (PMMA), with a melt index of 8.5 and moderate fluidity, allowing it to flow fully within the equipment during processing. This improves the molding quality and fullness of the finished product, making it suitable for complex structural products and enhancing its practicality. PMMA itself has excellent light transmittance, resulting in more uniform light reflection on the material surface. Combined with a toughening agent, which does not obstruct the light reflection of PMMA, the two components further enhance the light reflection efficiency of the black pigment, producing a rich, transparent, and high-gloss black effect. During material preparation, PMMA can be placed in a drying oven and dried with hot air circulation for 4-6 hours at a temperature of 80-90℃. This prevents trace amounts of moisture during material preparation from causing bubbles in the melt during extrusion, which would affect the high-gloss appearance.

[0029] The material contains a primary antioxidant and a secondary antioxidant. The primary antioxidant is a hindered phenolic antioxidant, while the secondary antioxidant is a phosphite-based secondary antioxidant. The combination of the two allows the hindered phenolic antioxidant to capture free radicals generated during processing or high-temperature use, while the phosphite-based secondary antioxidant can decompose hydroperoxides, preventing further generation of free radicals. Under their synergistic effect, the material's resistance to thermo-oxidative aging is significantly improved, making it less prone to yellowing and embrittlement with long-term use. Furthermore, the addition of light stabilizers and UV absorbers further enhances its thermo-oxidative durability and retains its luster, thus extending the material's service life.

[0030] By adding toughening agents, an elastic buffer structure can be formed inside the material, which effectively improves the impact strength without affecting the light transmittance, further improving the toughness of the material. In addition, the toughening agents have excellent weather resistance and good processing performance, which can improve the scratch resistance of the material while maintaining the light transmittance and surface gloss, thus improving the weather resistance and further enhancing the practicality of the material. Here, in the material preparation, the toughening agent is first placed in a drying oven and dried for 2 to 3 hours at a drying temperature of 80-85℃.

[0031] This material, through the synergistic design of polymethyl methacrylate, masterbatch, and additives, can achieve a high-gloss black effect in a single injection molding process. This not only reduces emissions from the spraying process but also avoids the risk of coating aging and peeling. The product's appearance remains consistent even after long-term use, further improving the material's practicality.

[0032] In addition, during material preparation, the main antioxidant, auxiliary antioxidant, light stabilizer, UV absorber and lubricant can be mixed with 5% to 10% polymethyl methacrylate to make an additive premix, which reduces the agglomeration of small molecule additives and facilitates subsequent dispersion.

[0033] The scratch-resistant agent is made of polyester-modified silicone material, accounting for 1% to 3% of the total raw materials. Adding the scratch-resistant agent to the material can form a micro-crosslinked wear-resistant layer on the material surface, improving the scratch resistance of the material and significantly enhancing the appearance durability of the produced parts.

[0034] The toughening agent is a transparent acrylic rubber, and the toughening agent accounts for 30% to 35% of the total raw materials. The lubricant is a modified alkyd ester lubricant, and the lubricant accounts for 0.3% of the total raw materials. The color masterbatch is a high-concentration color masterbatch, and the color masterbatch accounts for 2.5% to 3% of the total raw materials. The light stabilizer and the ultraviolet absorber each account for 0.2% to 0.3% of the total raw materials.

[0035] The toughening agent in the material is a transparent acrylic rubber. Its rubber phase can form an elastic buffer structure inside the material, effectively improving the impact strength. At the same time, the transparent rubber phase does not block light, ensuring that the high-gloss black appearance is not affected after toughening. In addition, polymethyl methacrylate accounts for 40% to 70% of the material. Polymethyl methacrylate itself has excellent light transmittance, and the light is reflected more evenly on the material surface. In synergy with the transparent acrylic rubber, the light reflection efficiency of the black pigment is improved, and a richer and more transparent high-gloss black effect is finally presented.

[0036] The masterbatch used in the material is a high-concentration masterbatch with an internal organic dye content of 20% to 25%. The high-concentration masterbatch has excellent compatibility with transparent acrylic rubber, reducing the problem of pigment agglomeration and uneven color caused by poor compatibility. In addition, the high concentration of organic dye of 20% to 25% can reduce the amount of masterbatch added, further reducing the risk of uneven pigment dispersion and ensuring that the black surface of the product is uniform and consistent, without local color difference or mottled phenomenon.

[0037] The lubricant used in the material is a modified alkyd ester lubricant, which has excellent compatibility with polymethyl methacrylate. Unlike traditional stearic acid lubricants, it will not precipitate onto the surface of the product after processing. At the same time, the lubricant can reduce the friction between the melt and the equipment, reduce material degradation caused by shear overheating during processing, and further ensure the appearance and performance stability of the product.

[0038] The material incorporates light stabilizers and UV absorbers. The light stabilizers have high absorption efficiency for 280-340nm ultraviolet rays and good stability at high temperatures; the UV absorbers can supplement the absorption of 340-380nm long-wave ultraviolet rays. Together, they cover a wider ultraviolet band. Compared with existing materials that only add a single light stabilizer, this material can increase the gloss retention rate of products to over 80% after 6000 hours of outdoor exposure, with no obvious fading or cracking.

[0039] A method for preparing a high-gloss black, spray-free PMMA / ASA material includes the following steps: S1: First, the polymethyl methacrylate, toughening agent, color masterbatch, scratch-resistant agent and various additives are dried to remove moisture from the raw materials and the raw materials are pretreated for later use. S2: Then, the various raw materials are weighed in proportion using a high-precision electronic scale, and then the weighed raw materials are put into a high-speed mixer for mixing to obtain a mixed powder. S3: The mixed powder is then placed into a co-rotating twin-screw extruder for melt blending and granulation. During this process, the temperature of the feeding section of the co-rotating twin-screw extruder is 160-180℃, the temperature of the compression section is 190-210℃, the temperature of the homogenization section is 210-230℃, the die temperature is 220-230℃, and the screw speed is 300-400 r / min. The extruded melt is water-cooled and shaped, and then the shaped granules are placed in a dryer to remove surface moisture, thereby preparing the material. S4: The produced materials are randomly sampled by a sampler, and the sampled materials are processed into parts by a fully hydraulic injection molding machine; S5: The processed parts are tested using a universal tensile testing machine, a plastic pendulum impact testing machine, and a heat distortion Vicat testing machine to verify whether the materials are qualified.

[0040] The material underwent performance testing, and the results are shown in Table 1.

[0041] Table 1

[0042] Table 1 shows that by introducing polymethyl methacrylate, masterbatch, and additives, the L-value of the material was reduced from 30 to 22.5, achieving a piano black effect. The introduction of toughening agents improved the impact resistance of the PMMA material. It is 4-5 times higher, and the toughening agent makes the material more tightly integrated, increasing the overall physical properties of the material, while reducing the UV transmittance to 15.5%, making the material more resistant to light aging.

[0043] This material, through its integrated design of resin selection, additive synergy, and process simplification, perfectly solves the pain points of existing materials such as poor appearance, insufficient toughness, weak aging resistance, and the need for spraying. It is suitable for injection molding, for use in paint-free parts, and for products requiring scratch resistance, low L value, and high gloss black.

[0044] Working principle: The main material is polymethyl methacrylate (PMMA), with a melt index of 8.5 and moderate fluidity, allowing the material to flow fully within the equipment during processing. This improves the molding quality and fullness of the finished product, making it suitable for complex structural products and enhancing its practicality. PMMA itself has excellent light transmittance, resulting in more uniform light reflection on the material surface. Combined with a toughening agent, which does not obstruct the light reflection of PMMA, the two components further enhance the light reflection efficiency of the black pigment, producing a rich, transparent, and high-gloss black effect. During material preparation, PMMA can be placed in a drying oven and dried with hot air circulation for 4-6 hours at a temperature of 80-90℃. This prevents trace amounts of moisture during material preparation from causing bubbles in the melt during extrusion, which would affect the high-gloss appearance.

[0045] The material contains a primary antioxidant and a secondary antioxidant. The primary antioxidant is a hindered phenolic antioxidant, while the secondary antioxidant is a phosphite-based secondary antioxidant. The combination of the two allows the hindered phenolic antioxidant to capture free radicals generated during processing or high-temperature use, while the phosphite-based secondary antioxidant can decompose hydroperoxides, preventing further generation of free radicals. Under their synergistic effect, the material's resistance to thermo-oxidative aging is significantly improved, making it less prone to yellowing and embrittlement with long-term use. Furthermore, the addition of light stabilizers and UV absorbers further enhances its thermo-oxidative durability and retains its luster, thus extending the material's service life.

[0046] By adding toughening agents, an elastic buffer structure can be formed inside the material, which effectively improves the impact strength without affecting the light transmittance, further improving the toughness of the material. In addition, the toughening agents have excellent weather resistance and good processing performance, which can improve the scratch resistance of the material while maintaining the light transmittance and surface gloss, thus improving the weather resistance and further enhancing the practicality of the material. Here, in the material preparation, the toughening agent is first placed in a drying oven and dried for 2 to 3 hours at a drying temperature of 80-85℃.

[0047] This material, through the synergistic design of polymethyl methacrylate, masterbatch, and additives, can achieve a high-gloss black effect in a single injection molding process. This not only reduces emissions from the spraying process but also avoids the risk of coating aging and peeling. The product's appearance remains consistent even after long-term use, further improving the material's practicality.

[0048] In addition, during material preparation, the main antioxidant, auxiliary antioxidant, light stabilizer, UV absorber and lubricant can be mixed with 5% to 10% polymethyl methacrylate to make an additive premix, which reduces the agglomeration of small molecule additives and facilitates subsequent dispersion.

[0049] The scratch-resistant agent accounts for 1% to 3% of the total raw materials. Adding the scratch-resistant agent to the material can form a micro-crosslinked wear-resistant layer on the material surface, which can improve the scratch resistance of the material and significantly improve the appearance durability of the produced parts.

Claims

1. Preparation of a high-gloss black spray-free PMMA / ASA material, characterized in that The raw materials are composed of polymethyl methacrylate, toughening agent, antioxidant, light stabilizer, color master batch, ultraviolet absorber, lubricant and scratch-resistant agent, the antioxidant accounts for 0.2-0.4% of the total raw materials, the polymethyl methacrylate accounts for 40-70% of the total raw materials, the toughening agent accounts for 30-35% of the total raw materials, the lubricant accounts for 0.3% of the total raw materials, the color master batch accounts for 2.5-3% of the total raw materials, and the light stabilizer and ultraviolet absorber each accounts for 0.2-0.3% of the total raw materials.

2. The preparation of a high-gloss black spray-free PMMA / ASA material according to claim 1, characterized in that: The antioxidant includes primary antioxidant and auxiliary antioxidant, and the primary antioxidant and auxiliary antioxidant each accounts for 0.1-0.2% of the total raw materials.

3. The preparation of a high-gloss black spray-free PMMA / ASA material according to claim 2, characterized in that: The primary antioxidant is hindered phenolic antioxidant, and the auxiliary antioxidant is phosphite auxiliary antioxidant.

4. The preparation of a high-gloss black spray-free PMMA / ASA material according to claim 1, characterized in that: The toughening agent is transparent acrylic rubber.

5. The preparation of a high-gloss black spray-free PMMA / ASA material according to claim 1, characterized in that: The lubricant is modified alkyd ester lubricant.

6. The preparation of a high-gloss black spray-free PMMA / ASA material according to claim 1, characterized in that: The color master batch is high-concentration color master batch.

7. A process for the production of a high-gloss black spray-free PMMA / ASA material, which is suitable for the production of a high-gloss black spray-free PMMA / ASA material according to any one of claims 1 to 6, characterized in that The method comprises the following steps: S1: first, dry the polymethyl methacrylate, toughening agent, color master batch, scratch-resistant agent and various auxiliaries to remove the moisture of the raw materials, and pretreat the raw materials for standby; S2: then, weigh the various raw materials in proportion through a high-precision electronic scale, and then put the weighed various raw materials into a high-speed mixer to mix, so as to obtain mixed powder; S3: then put the mixed powder into a co-rotating twin-screw extruder to melt blend and granulate, during which, the temperature of the feeding section of the co-rotating twin-screw extruder is 160-180℃, the temperature of the compression section is 190-210℃, the temperature of the homogenization section is 210-230℃, the temperature of the die head is 220-230℃, the screw rotation speed is 300-400r / min, the extruded melt is water-cooled and shaped, then the shaped particles are put into a drying machine to remove the surface moisture, so as to prepare the material; S4: the produced material is randomly sampled through a sampler, and the sampled material is processed into parts through a full-hydraulic injection molding machine; S5: the processed parts are tested through a universal tensile testing machine, a plastic pendulum impact testing machine and a hot deformation Vicat testing machine, so as to check whether the material is qualified.

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