Scratch-resistant plastic master batch special for plastic and preparation method of scratch-resistant plastic master batch

Abstract

The invention relates to the technical field of plastics, and discloses a special scratch-resistant plastic master batch for plastics and a preparation method of the special scratch-resistant plastic master batch. The modified plastic particles are prepared from the following raw materials in parts by weight: 100 parts of waste PS sheet stock, 5-15 parts of ethylene-vinyl acetate copolymer, 10-30 parts of hard nano filler, 2-8 parts of dispersing agent, 1-5 parts of assistant, 1-5 parts of antioxidant, 0.5-5 parts of hexamethylol melamine hexamethyl ether and 0.5-5 parts of vulcanized lard. According to the preparation method disclosed by the invention, by optimizing a formula and a process and introducing the hard nano filler and the efficient dispersant, the scratch resistance of the plastic is remarkably improved, surface scratches and weight loss are reduced, and meanwhile, the prepared master batch also integrates multiple functions such as flame retardance and antibiosis, keeps excellent processing performance and environmental protection characteristics, and is suitable for industrial production. The material is suitable for the fields of automotive interiors, electronic equipment shells and the like, and has wide market application prospects and remarkable economic benefits.

Description

Technical Field

[0001] The invention relates to the technical field of plastics, and in particular to a scratch-resistant plastic masterbatch specially used for plastics and a preparation method thereof. Background Art

[0002] With the widespread application of plastic materials in various fields, such as automobiles, electronics, construction and daily consumer goods, the requirements for the physical and mechanical properties of plastic products are becoming higher and higher. Especially in some occasions that are prone to physical wear, such as automobile interiors, electronic equipment housings, furniture surfaces, etc., the surface scratch resistance of plastic products has become one of the key factors affecting product life and appearance quality. However, traditional plastic materials (such as polystyrene PS, polypropylene PP, polyethylene PE, etc.) are prone to scratches and damage when facing slight scratches in daily use due to their low hardness and wear resistance, resulting in a significant decrease in the aesthetics and service life of the product.

[0003] To solve this problem, existing technologies mainly improve the scratch resistance of plastics by adding various modifiers. For example, some studies have tried to enhance the hardness and wear resistance of plastic surfaces by adding inorganic fillers (such as silica, alumina, etc.) or organic modifiers (such as polyurethane, epoxy resin, etc.). In addition, some studies have introduced nanomaterials to improve the scratch resistance of plastics by using their high hardness and small size effects. However, these methods have certain limitations: on the one hand, traditional fillers have poor dispersibility and are prone to agglomeration in the plastic matrix, resulting in processing difficulties and unstable performance; on the other hand, certain modifiers may have a negative impact on other properties of plastics (such as flexibility, transparency, etc.), limiting their scope of application.

[0004] In addition, although some scratch-resistant plastic masterbatches in the prior art can improve the scratch resistance to a certain extent, they generally have problems such as high cost and poor environmental protection. For example, some flame retardants and antibacterial agents contain harmful substances and do not meet modern environmental protection standards; at the same time, the selection and proportion of some additives are unreasonable, resulting in the comprehensive performance of the masterbatch being not ideal and unable to meet the needs of the high-end market. Therefore, we propose a scratch-resistant plastic masterbatch for plastics and a preparation method. Summary of the invention

[0005] The main purpose of the present invention is to provide a scratch-resistant plastic masterbatch specially for plastics and a preparation method thereof, which can effectively solve the problems in the background technology.

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] A scratch-resistant plastic masterbatch specially used for plastics is prepared from the following raw materials in parts by weight: 100 parts of waste PS flakes, 5-15 parts of ethylene-vinyl acetate copolymer, 10-30 parts of hard nano filler, 2-8 parts of dispersant, 1-5 parts of auxiliary agent, 1-5 parts of antioxidant, 0.5-5 parts of hexahydroxymethyl melamine hexmethyl ether, and 0.5-5 parts of sulfurized lard.

[0008] Preferably, the particle size of the hard nanofiller is 50-200 nm, and the hard nanofiller is selected from one or more combinations of silicon dioxide, aluminum oxide or silicon carbide.

[0009] Preferably, the dispersant is selected from polyethylene wax, polyethylene glycol or a mixture of the two.

[0010] Preferably, the auxiliary agent includes a flame retardant and an antibacterial agent, and the mass ratio of the flame retardant to the antibacterial agent is 1:1.

[0011] Preferably, the flame retardant is antimony trioxide; and the antibacterial agent is a silver ion antibacterial agent.

[0012] Preferably, the antioxidant is selected from any one of antioxidant 168, antioxidant 1010, and antioxidant 1076.

[0013] The present invention also discloses a method for preparing a scratch-resistant plastic masterbatch specially for plastics, comprising the following steps:

[0014] S1. Place the waste PS sheets in a vacuum drying oven to remove any residual moisture;

[0015] S2, adding the dried waste PS flakes, ethylene-vinyl acetate copolymer, hard nano filler and dispersant into a high-speed mixer according to the formula ratio, and mixing them evenly to obtain a mixture A;

[0016] S3, adding flame retardant, antibacterial agent, antioxidant, hexahydroxymethyl melamine hexamethyl ether and sulfurized lard to the mixed mixture A in sequence, and continuing to mix in a high-speed mixer for 3-8 minutes to obtain a mixture B;

[0017] S4, sending the mixed mixture B into a twin-screw extruder for melt extrusion, pelletizing, and drying to obtain a scratch-resistant plastic masterbatch for plastics.

[0018] Preferably, in S1, the temperature of the vacuum drying oven is 80-100° C., and the drying time is 2-4 hours.

[0019] Preferably, in S2, the rotation speed of the high-speed mixer is 800-1200 rpm, and the mixing time is 5-10 min.

[0020] Preferably, in S4, the extrusion temperature of the twin-screw extruder is 190-200° C., the main engine speed is 400-600 rpm, the feeding speed is 55 rpm, and the pelletizer speed after extrusion is 50 rpm.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The present invention introduces hard nano fillers with specific particle sizes (50-200nm), such as silicon dioxide, aluminum oxide or silicon carbide, and the scratch-resistant plastic masterbatch for plastics of the present invention can greatly improve the hardness and wear resistance of the surface of plastic products. These nano fillers are evenly distributed in the plastic matrix to form a microstructure reinforcement layer, which effectively resists slight scratches and wear in daily use, significantly prolongs the service life and appearance quality of the product, and is particularly suitable for applications with high requirements for surface protection, such as automotive interiors and electronic equipment housings.

[0023] 2. The present invention uses highly efficient dispersants, such as polyethylene wax and polyethylene glycol, to ensure uniform dispersion of hard nanofillers in the plastic matrix, avoiding processing problems caused by filler aggregation. In addition, waste PS flakes are used as base resins in combination with ethylene-vinyl acetate copolymer toughening agents, so that the masterbatch has good fluidity and processing properties. This combination not only simplifies the production process and reduces costs, but also ensures good compatibility of the masterbatch with various plastic materials, and can be directly used on standard plastic processing equipment without additional adjustment of process parameters. This provides convenience for large-scale industrial production, while also ensuring the quality and consistency of the final product.

[0024] 3. The present invention makes full use of waste PS flakes as the main raw material, realizes the reuse of plastic waste, and conforms to the concept of circular economy. By recycling waste PS materials, not only can the pollution of plastic waste to the environment be reduced, but also the demand for virgin plastics can be reduced, relieving the pressure on oil resources. In addition, all additives are environmentally friendly materials, do not contain any harmful substances, and meet strict international environmental standards. No toxic gas or waste is generated during the preparation process. It is a green and safe production process that helps protect the environment and ensure the health and safety of operators.

[0025] 4. The plastic masterbatch of the present invention not only has excellent scratch resistance, but also gives plastic products multiple functions by adding flame retardants (antimony trioxide) and antibacterial agents (silver ion antibacterial agents). The addition of flame retardants makes plastic products have certain fire safety and reduces the risk of fire; antibacterial agents effectively inhibit the growth of microorganisms such as bacteria and molds, and are particularly suitable for application scenarios with high hygiene requirements, such as medical equipment and food packaging. In addition, the selection of antioxidants (such as antioxidant 168, antioxidant 1010, and antioxidant 1076) further enhances the antioxidant properties of plastics and extends the service life of the product. Hexamethylol melamine hexamethon, as a cross-linking agent, improves the thermal stability and mechanical strength of the material, and sulfurized lard, as a lubricant, improves processing fluidity. Through a reasonable combination of additives, the plastic masterbatch of the present invention can significantly improve the comprehensive performance of plastic products in many aspects and meet the diverse needs of different application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The present invention is a flow chart for preparing a scratch-resistant plastic masterbatch specially used for plastics. DETAILED DESCRIPTION

[0027] Example 1

[0028] like Figure 1 As shown, a scratch-resistant plastic masterbatch specially used for plastics is made of the following raw materials in parts by weight: 100 parts of waste PS flakes, 5 parts of ethylene-vinyl acetate copolymer, 10 parts of hard nano fillers, 2 parts of dispersants, 1 part of additives, 1 part of antioxidants, 0.5 parts of hexahydroxymethyl melamine hexmethyl ether, and 0.5 parts of sulfurized lard.

[0029] Wherein, the particle size of the hard nano filler is 50-200 nm, and the hard nano filler is selected from one or more combinations of silicon dioxide, aluminum oxide or silicon carbide.

[0030] Wherein, the dispersant is selected from polyethylene wax, polyethylene glycol or a mixture of the two.

[0031] The auxiliary agent includes a flame retardant and an antibacterial agent, and the mass ratio of the flame retardant to the antibacterial agent is 1:1.

[0032] Wherein, the flame retardant is antimony trioxide; and the antibacterial agent is a silver ion antibacterial agent.

[0033] Wherein, the antioxidant is selected from any one of antioxidant 168, antioxidant 1010, and antioxidant 1076.

[0034] The method for preparing the above-mentioned plastic particles modified from waste plastics comprises the following steps:

[0035] S1. Place the waste PS sheets in a vacuum drying oven to remove any residual moisture;

[0036] Wherein, the temperature of the vacuum drying oven is 80-100°C, and the drying time is 2-4h.

[0037] S2, adding the dried waste PS flakes, ethylene-vinyl acetate copolymer, hard nano filler and dispersant into a high-speed mixer according to the formula ratio, and mixing them evenly to obtain a mixture A;

[0038] Wherein, the rotation speed of the high-speed mixer is 800-1200rpm, and the mixing time is 5-10min.

[0039] S3, adding flame retardant, antibacterial agent, antioxidant, hexahydroxymethyl melamine hexamethyl ether and sulfurized lard to the mixed mixture A in sequence, and continuing to mix in a high-speed mixer for 3-8 minutes to obtain a mixture B;

[0040] S4, sending the mixed mixture B into a twin-screw extruder for melt extrusion, pelletizing, and drying to obtain a scratch-resistant plastic masterbatch for plastics.

[0041] The extrusion temperature of the twin-screw extruder is 190-200°C, the main engine speed is 400-600rpm, the feeding speed is 55rpm, and the pelletizer speed after extrusion is 50rpm.

[0042] Example 2

[0043] like Figure 1 As shown, a scratch-resistant plastic masterbatch specially used for plastics is made of the following raw materials in parts by weight: 100 parts of waste PS flakes, 15 parts of ethylene-vinyl acetate copolymer, 30 parts of hard nano filler, 8 parts of dispersant, 5 parts of additive, 5 parts of antioxidant, 5 parts of hexahydroxymethyl melamine hexmethyl ether, and 5 parts of sulfurized lard.

[0044] Wherein, the particle size of the hard nano filler is 50-200 nm, and the hard nano filler is selected from one or more combinations of silicon dioxide, aluminum oxide or silicon carbide.

[0045] Wherein, the dispersant is selected from polyethylene wax, polyethylene glycol or a mixture of the two.

[0046] The auxiliary agent includes a flame retardant and an antibacterial agent, and the mass ratio of the flame retardant to the antibacterial agent is 1:1.

[0047] Wherein, the flame retardant is antimony trioxide; and the antibacterial agent is a silver ion antibacterial agent.

[0048] Wherein, the antioxidant is selected from any one of antioxidant 168, antioxidant 1010, and antioxidant 1076.

[0049] The method for preparing the above-mentioned plastic particles modified from waste plastics comprises the following steps:

[0050] S1. Place the waste PS sheets in a vacuum drying oven to remove any residual moisture;

[0051] Wherein, the temperature of the vacuum drying oven is 80-100°C, and the drying time is 2-4h.

[0052] S2, adding the dried waste PS flakes, ethylene-vinyl acetate copolymer, hard nano filler and dispersant into a high-speed mixer according to the formula ratio, and mixing them evenly to obtain a mixture A;

[0053] Wherein, the rotation speed of the high-speed mixer is 800-1200rpm, and the mixing time is 5-10min.

[0054] S3, adding flame retardant, antibacterial agent, antioxidant, hexahydroxymethyl melamine hexamethyl ether and sulfurized lard to the mixed mixture A in sequence, and continuing to mix in a high-speed mixer for 3-8 minutes to obtain a mixture B;

[0055] S4, sending the mixed mixture B into a twin-screw extruder for melt extrusion, pelletizing, and drying to obtain a scratch-resistant plastic masterbatch for plastics.

[0056] The extrusion temperature of the twin-screw extruder is 190-200°C, the main engine speed is 400-600rpm, the feeding speed is 55rpm, and the pelletizer speed after extrusion is 50rpm.

[0057] Example 3

[0058] like Figure 1 As shown, a scratch-resistant plastic masterbatch specially used for plastics is made of the following raw materials in parts by weight: 100 parts of waste PS flakes, 10 parts of ethylene-vinyl acetate copolymer, 15 parts of hard nano filler, 5 parts of dispersant, 3 parts of additives, 3 parts of antioxidant, 2.5 parts of hexahydroxymethyl melamine hexmethyl ether, and 2.5 parts of sulfurized lard.

[0059] Wherein, the particle size of the hard nano filler is 50-200 nm, and the hard nano filler is selected from one or more combinations of silicon dioxide, aluminum oxide or silicon carbide.

[0060] Wherein, the dispersant is selected from polyethylene wax, polyethylene glycol or a mixture of the two.

[0061] The auxiliary agent includes a flame retardant and an antibacterial agent, and the mass ratio of the flame retardant to the antibacterial agent is 1:1.

[0062] Wherein, the flame retardant is antimony trioxide; and the antibacterial agent is a silver ion antibacterial agent.

[0063] Wherein, the antioxidant is selected from any one of antioxidant 168, antioxidant 1010, and antioxidant 1076.

[0064] The method for preparing the above-mentioned plastic particles modified from waste plastics comprises the following steps:

[0065] S1. Place the waste PS sheets in a vacuum drying oven to remove any residual moisture;

[0066] Wherein, the temperature of the vacuum drying oven is 80-100°C, and the drying time is 2-4h.

[0067] S2, adding the dried waste PS flakes, ethylene-vinyl acetate copolymer, hard nano filler and dispersant into a high-speed mixer according to the formula ratio, and mixing them evenly to obtain a mixture A;

[0068] Wherein, the rotation speed of the high-speed mixer is 800-1200rpm, and the mixing time is 5-10min.

[0069] S3, adding flame retardant, antibacterial agent, antioxidant, hexahydroxymethyl melamine hexamethyl ether and sulfurized lard to the mixed mixture A in sequence, and continuing to mix in a high-speed mixer for 3-8 minutes to obtain a mixture B;

[0070] S4, sending the mixed mixture B into a twin-screw extruder for melt extrusion, pelletizing, and drying to obtain a scratch-resistant plastic masterbatch for plastics.

[0071] The extrusion temperature of the twin-screw extruder is 190-200°C, the main engine speed is 400-600rpm, the feeding speed is 55rpm, and the pelletizer speed after extrusion is 50rpm.

[0072] test

[0073] In order to verify the scratch resistance of the special scratch-resistant plastic masterbatch for plastics in this application, we will conduct a series of experiments according to the standardized test method. The following are the detailed test plans and steps:

[0074] (1) Sample preparation

[0075] Embodiment: Use the plastic masterbatch prepared in the above embodiments 1-3.

[0076] Comparative example: Traditional plastic masterbatch (without adding hard nano fillers, dispersants and other modified ingredients) was used as the control group.

[0077] (2) Injection molding

[0078] The same injection molding machine was used to injection mold the masterbatches of the embodiment and the comparative example into standard test pieces with a size of 100 mm×50 mm×3 mm, ensuring that the thickness of each test piece was uniform.

[0079] (3) Scratch resistance test

[0080] Standard: The scratch resistance test is conducted using the ASTM D1044 Taber abrasion tester.

[0081] Test conditions:

[0082] Load: 10N

[0083] Speed: 72 rpm

[0084] Grinding wheel: CS-10F grinding wheel (suitable for plastic materials)

[0085] Test time: 1000 rpm.

[0086] Measurement parameters:

[0087] ΔL value: The brightness change (ΔL) of the sample surface is measured by a colorimeter. The smaller the ΔL value, the better the scratch resistance.

[0088] Weight loss: Weigh the weight change of the sample before and after the test and calculate the weight loss rate. The smaller the weight loss, the better the scratch resistance.

[0089] Surface morphology: Use an optical microscope or scanning electron microscope (SEM) to observe the scratches on the sample surface and evaluate the degree of surface damage.

[0090] (4) Data analysis

[0091] ΔL value comparison: record and compare the ΔL values ​​of the example and comparative example samples, and analyze their differences.

[0092] Weight loss comparison: Calculate and compare the weight loss rates of the examples and comparative examples to evaluate the scratch resistance.

[0093] Surface morphology analysis: By observing under a microscope, the surface scratches of the samples of the embodiment and the comparative example were compared to visually evaluate the scratch resistance effect.

[0094] (5) Results and conclusions

[0095] Scratch resistance test results (see Table 1)

[0096] Table 1

[0097] Sample No. ΔL value (brightness change) Weight loss rate (%) Surface morphology (scratch condition) Example 1 0.28 0.06 Smooth surface, slight scratches Example 2 0.29 0.05 Smooth surface, slight scratches Example 3 0.26 0.04 Smooth surface with almost no scratches Comparative Example 1 0.98 0.20 There are obvious scratches on the surface Comparative Example 2 0.89 0.18 There are obvious scratches on the surface

[0098] in conclusion

[0099] It can be seen from Table 1 that the plastic masterbatch prepared in the embodiment is significantly better than the traditional plastic masterbatch in terms of scratch resistance.

[0100] ΔL value: The ΔL values ​​of the embodiments range from 0.26 to 0.29, with an average value of about 0.276; while the ΔL values ​​of the comparative examples are 0.98 and 0.89, respectively, with an average value of about 0.935. The ΔL values ​​of the embodiments are significantly lower than those of the comparative examples, indicating that their surfaces are less susceptible to scratching.

[0101] Weight loss rate: The weight loss rate of the embodiment is between 0.04% and 0.06%, which is much lower than 0.18% to 0.20% of the comparative example, indicating that the embodiment has better scratch resistance and can effectively reduce material wear.

[0102] Surface morphology: Through microscopic observation, the surface of the example sample has almost no obvious scratches and maintains good smoothness; while the surface of the comparative example sample has obvious scratches, indicating that its scratch resistance is poor.

[0103] The present invention introduces hard nano fillers with specific particle sizes (50-200nm), such as silicon dioxide, aluminum oxide or silicon carbide, and the scratch-resistant plastic masterbatch for plastics of the present invention can greatly improve the hardness and wear resistance of the surface of plastic products. These nano fillers are evenly distributed in the plastic matrix to form a microstructure reinforcement layer, which effectively resists slight scratches and wear in daily use, significantly prolongs the service life and appearance quality of the product, and is particularly suitable for applications such as automotive interiors and electronic equipment housings that require high surface protection; the present invention uses efficient dispersants, such as polyethylene wax and polyethylene glycol, to ensure the uniform dispersion of hard nano fillers in the plastic matrix, avoiding processing difficulties caused by filler aggregation. In addition, waste PS flakes are used as base resins and in combination with ethylene-vinyl acetate copolymer toughening agents, so that the masterbatch has good fluidity and processing performance. This combination not only simplifies the production process and reduces costs, but also ensures the good compatibility of the masterbatch with various plastic materials, and can be directly used on standard plastic processing equipment without additional adjustment of process parameters. This provides convenience for large-scale industrial production, while also ensuring the quality and consistency of the final product; the present invention makes full use of waste PS flakes as the main raw material, realizes the reuse of plastic waste, and conforms to the concept of circular economy. By recycling waste PS materials, not only can the pollution of plastic waste to the environment be reduced, but also the demand for virgin plastics can be reduced, alleviating the pressure on oil resources. In addition, all additives are environmentally friendly materials, do not contain any harmful substances, and meet strict international environmental standards. No toxic gas or waste is generated during the preparation process, which is a green and safe production process that helps to protect the environment and ensure the health and safety of operators; the plastic masterbatch of the present invention not only has excellent scratch resistance, but also gives plastic products multiple functions by adding flame retardants (antimony trioxide) and antibacterial agents (silver ion antibacterial agents). The addition of flame retardants makes plastic products have certain fire safety and reduces the risk of fire; antibacterial agents effectively inhibit the growth of microorganisms such as bacteria and molds, and are particularly suitable for application scenarios with high hygiene requirements, such as medical equipment and food packaging. In addition, the selection of antioxidants (such as antioxidant 168, antioxidant 1010, antioxidant 1076) further enhances the antioxidant properties of plastics and prolongs the service life of the product. Hexamethylol melamine hexamethon, as a crosslinking agent, improves the thermal stability and mechanical strength of the material, and sulfurized lard, as a lubricant, improves processing fluidity. Through a reasonable combination of additives, the plastic masterbatch of the present invention can significantly improve the comprehensive performance of plastic products in many aspects and meet the diverse needs of different application scenarios.

[0104] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A scratch-resistant plastic masterbatch for plastics, characterized by: The invention is prepared from the following raw materials in parts by weight: 100 parts of waste PS flakes, 5-15 parts of ethylene-vinyl acetate copolymer, 10-30 parts of hard nano filler, 2-8 parts of dispersant, 1-5 parts of auxiliary agent, 1-5 parts of antioxidant, 0.5-5 parts of hexahydroxymethyl melamine hexmethyl ether and 0.5-5 parts of sulfurized lard.

2. The scratch-resistant plastic masterbatch for plastics according to claim 1, characterized in that: The particle size of the hard nano filler is 50-200 nm, and the hard nano filler is selected from one or more combinations of silicon dioxide, aluminum oxide or silicon carbide.

3. The scratch-resistant plastic masterbatch for plastics according to claim 1, characterized in that: The dispersant is selected from polyethylene wax, polyethylene glycol or a mixture of the two.

4. The scratch-resistant plastic masterbatch for plastics according to claim 1, characterized in that: The auxiliary agent includes a flame retardant and an antibacterial agent, and the mass ratio of the flame retardant to the antibacterial agent is 1:

1.

5. The scratch-resistant plastic masterbatch for plastics according to claim 4, characterized in that: The flame retardant is antimony trioxide; the antibacterial agent is a silver ion antibacterial agent.

6. The scratch-resistant plastic masterbatch for plastics according to claim 1, characterized in that: The antioxidant is selected from any one of antioxidant 168, antioxidant 1010, and antioxidant 1076.

7. The method for preparing a scratch-resistant plastic masterbatch for plastics according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1. Place the waste PS sheets in a vacuum drying oven to remove any residual moisture; S2, adding the dried waste PS flakes, ethylene-vinyl acetate copolymer, hard nano filler and dispersant into a high-speed mixer according to the formula ratio, and mixing them evenly to obtain a mixture A; S3, adding flame retardant, antibacterial agent, antioxidant, hexahydroxymethyl melamine hexamethyl ether and sulfurized lard to the mixed mixture A in sequence, and continuing to mix in a high-speed mixer for 3-8 minutes to obtain a mixture B; S4, sending the mixed mixture B into a twin-screw extruder for melt extrusion, pelletizing, and drying to obtain a scratch-resistant plastic masterbatch for plastics.

8. The method for preparing a scratch-resistant plastic masterbatch for plastics according to claim 7, characterized in that: In S1, the temperature of the vacuum drying oven is 80-100°C, and the drying time is 2-4h.

9. The method for preparing a scratch-resistant plastic masterbatch for plastics according to claim 7, characterized in that: In S2, the rotation speed of the high-speed mixer is 800-1200 rpm, and the mixing time is 5-10 min.

10. The method for preparing a scratch-resistant plastic masterbatch for plastics according to claim 7, characterized in that: In S4, the extrusion temperature of the twin-screw extruder is 190-200° C., the main engine speed is 400-600 rpm, the feeding speed is 55 rpm, and the pelletizer speed after extrusion is 50 rpm.

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