Waste plastic modified plastic particles and preparation method thereof

Abstract

The invention relates to the technical field of modified plastics, and discloses waste plastic modified plastic particles and a preparation method thereof. The modified plastic particles are prepared from the following raw materials in parts by weight: 100 parts of waste plastic sheets, 5-15 parts of a fiber reinforced material, 1-10 parts of a compatilizer, 1-10 parts of a flow improver, 1-10 parts of an antioxidant, 1-10 parts of a light stabilizer, 1-10 parts of a flame retardant, 0.5-5 parts of a cross-linking agent and 0.5-5 parts of a lubricant; the specific preparation method comprises the following steps: collecting and classifying the waste plastics; cleaning and drying treatment; crushing and screening; mixing the materials; melting and plasticizing; and cooling and pelletizing. Through comprehensive modification treatment, the mechanical strength, toughness and heat resistance of the waste plastic are remarkably improved, and meanwhile, the compatibility and processability of different plastics are improved. The low-cost and environment-friendly preparation method is adopted, the prepared modified plastic particles are excellent in tensile strength, bending strength, impact strength and flame retardance, and efficient recycling of waste plastic is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of modified plastics, and in particular to plastic particles modified from waste plastics and a preparation method thereof. Background Art

[0002] With the continuous improvement of global awareness of environmental protection, the recycling and reuse of waste plastics has become one of the key ways to solve the problem of plastic waste. Traditional methods of recycling waste plastics mainly rely on simple physical regeneration, that is, the waste plastics are directly reprocessed into new plastic products after being cleaned and crushed. However, this method has many limitations: first, the performance of recycled plastics is often not as good as that of virgin plastics, especially in terms of mechanical strength, toughness and heat resistance, which limits its scope of application; second, when different types of waste plastics are mixed together, due to poor compatibility, it is easy to cause unstable material properties and affect product quality; in addition, traditional recycling methods are difficult to effectively remove impurities and pollutants in plastics, resulting in low purity of recycled plastics, further reducing their market competitiveness. Therefore, we propose a plastic particle modified from waste plastics and a preparation method thereof. Summary of the invention

[0003] The main purpose of the present invention is to provide a plastic particle modified from waste plastics and a preparation method thereof, which can effectively solve the problems in the background technology.

[0004] To achieve the above object, the technical solution adopted by the present invention is:

[0005] A plastic particle modified from waste plastics is prepared from the following raw materials in parts by weight: 100 parts of waste plastic flakes, 5-15 parts of fiber reinforcement materials, 1-10 parts of compatibilizers, 1-10 parts of flow improvers, 1-10 parts of antioxidants, 1-10 parts of light stabilizers, 1-10 parts of flame retardants, 0.5-5 parts of crosslinking agents and 0.5-5 parts of lubricants.

[0006] Preferably, the waste plastic flakes are selected from one or more mixtures of PET plastic, HDPE plastic, and PP plastic.

[0007] Preferably, the fiber reinforcement material is selected from glass fiber, carbon fiber, or a mixture of the two.

[0008] Preferably, the flow improver is selected from any one of silicone oil and zinc stearate.

[0009] Preferably, the antioxidant is selected from any one of antioxidant 168, antioxidant 1010, and antioxidant 1076, the light stabilizer is selected from any one of benzophenone and benzotriazole ultraviolet absorbers, and the flame retardant is selected from one or a mixture of antimony trioxide, antimony pentoxide, and aluminum hydroxide.

[0010] Preferably, the cross-linking agent is selected from hexamethylolmelamine hexamethicone, dicumyl peroxide or a mixture of the two, and the lubricant is selected from any one of sulphurized lard and calcium stearate.

[0011] The present invention also discloses a method for preparing plastic particles modified from waste plastics, comprising the following steps:

[0012] S1. Collection and classification of waste plastics: Collect waste PET, HDPE, and PP plastics from the market, and conduct preliminary classification according to the type, color, and transparency of the plastics to ensure that plastics of the same type are handled separately;

[0013] S2. Cleaning and drying: Put the sorted waste plastics into a cleaning tank, add an appropriate amount of cleaning agent, use an ultrasonic cleaning machine to remove dirt, labels and impurities on the surface, then rinse with clean water and place in an oven for drying;

[0014] S3, crushing and screening: the dried waste plastic is sent to a crusher, sieved, and fragments with a particle size of less than 5 mm are obtained;

[0015] S4, mixing: adding plastic fragments, fiber reinforcement material, compatibilizer, flow improver, antioxidant, light stabilizer, flame retardant, crosslinking agent and lubricant into a high-speed mixer, and mixing at a speed of 500-800 r / min to obtain a premix;

[0016] S5, melt plasticization: add the premix into a twin-screw extruder, heat it to a molten state and plasticize it;

[0017] S6, cooling and pelletizing: The melt is extruded into a strip structure by an extruder, cooled and hardened by a water cooling tank, and then cut by a pelletizer to obtain modified plastic particles.

[0018] Preferably, in S2, the cleaning temperature is 40°C-60°C, and the cleaning time is 15-30 minutes; the oven drying temperature is 80°C-100°C, and the drying time is 2-4 hours, until the moisture content is lower than 0.2%.

[0019] Preferably, in S5, the rotation speed of the twin-screw extruder is 400-600r / min, and the residence time of the material in the extruder is 3-5min; the temperatures of the eight temperature zones are: zone 1 190-200℃, zone 200-210℃, zone 3 210-220℃, zone 4 210-220℃, zone 5 220-230℃, zone 6 220-230℃, zone 7 235-245℃, zone 8 235-245℃, and die head 235-245℃.

[0020] Preferably, in S6, the water temperature in the water cooling tank is 10°C-20°C.

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

[0022] 1. The present invention adds a specific proportion of fiber reinforcement materials (such as glass fiber, carbon fiber) and compatibilizers, so that the modified particles of waste plastics show significantly improved mechanical properties in the molded products. Fiber reinforcement materials can effectively increase the strength and toughness of plastics, especially in terms of tensile strength, bending strength and impact strength. This not only makes the modified plastic particles suitable for manufacturing products with high mechanical property requirements, such as automotive parts, electronic and electrical housings, etc., but also greatly broadens its application range and meets the needs of more high-end markets. In addition, the addition of new flame retardants significantly improves the oxygen index of the board and enhances the flame retardant properties of the board.

[0023] 2. The present invention introduces flow improvers (such as silicone oil and zinc stearate). These additives significantly improve the fluidity of the plastic melt, reduce the processing difficulty, and enable the modified plastic particles to show better processability in molding processes such as injection molding and extrusion. Specifically, the flow improver reduces the friction and mold sticking of the plastic during processing, and avoids product defects caused by poor fluidity, such as surface flaws and inconsistent dimensions. At the same time, good fluidity also means that lower processing temperatures and pressures can be used, thereby reducing energy consumption and equipment wear, and further reducing production costs. This is particularly important for large-scale industrial production, which can improve production efficiency, reduce scrap rates, and maximize economic benefits. In addition, the addition of compatibilizers improves the compatibility between different types of plastics, enhances the overall performance of the composite material, and ensures the stability and durability of the material in complex environments.

[0024] 3. The present invention realizes the effective reuse of waste plastics through efficient cleaning, classification and modification, and greatly improves the recycling rate of plastic resources. Traditional waste plastic recycling methods have problems such as low efficiency and unstable quality. The present invention converts waste PET, HDPE, PP and other plastics into high-performance modified plastic particles through precisely controlled formula design and optimized processing parameters, which not only reduces the pollution of plastic waste to the environment, especially in the marine environment, but also provides a feasible solution to solve the global plastic waste problem.

[0025] 4. The present invention strictly controls environmental conditions during the preparation process to ensure that the material properties are not affected by external factors. It also follows the concept of green manufacturing, reduces the use of new raw materials, reduces carbon emissions, and meets the requirements of sustainable development. This circular economy model helps to alleviate the pressure of resource shortages and promotes the development of society in a more environmentally friendly and sustainable direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The present invention is a flow chart for preparing plastic particles modified from waste plastics. DETAILED DESCRIPTION

[0027] Example 1

[0028] like Figure 1 As shown, a plastic particle modified from waste plastic is made of the following raw materials in parts by weight: 100 parts of waste plastic flakes, 5 parts of fiber reinforcement material, 1 part of compatibilizer, 1 part of flow improver, 1 part of antioxidant, 1 part of light stabilizer, 1 part of flame retardant, 0.5 part of cross-linking agent and 0.5 part of lubricant.

[0029] Wherein, the waste plastic flakes are selected from one or more mixtures of PET plastic, HDPE plastic and PP plastic.

[0030] Wherein, the fiber reinforcement material is selected from glass fiber, carbon fiber or a mixture of the two.

[0031] Wherein, the flow improver is selected from any one of silicone oil and zinc stearate.

[0032] Among them, the antioxidant is selected from any one of antioxidant 168, antioxidant 1010, and antioxidant 1076, the light stabilizer is selected from any one of benzophenone and benzotriazole ultraviolet absorbers, and the flame retardant is selected from one or a mixture of antimony trioxide, antimony pentoxide, and aluminum hydroxide.

[0033] Wherein, the cross-linking agent is selected from hexahydroxymethylmelamine hexamethyl ether, dicumyl peroxide or a mixture of the two, and the lubricant is selected from any one of sulphurized lard and calcium stearate.

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

[0035] S1. Collection and classification of waste plastics: Collect waste PET, HDPE, and PP plastics from the market, and conduct preliminary classification according to the type, color, and transparency of the plastics to ensure that plastics of the same type are handled separately;

[0036] S2. Cleaning and drying: Put the sorted waste plastics into a cleaning tank, add an appropriate amount of cleaning agent, use an ultrasonic cleaning machine to remove dirt, labels and impurities on the surface, then rinse with clean water and place in an oven for drying;

[0037] The cleaning temperature is 40°C-60°C, and the cleaning time is 15-30 minutes; the oven drying temperature is 80°C-100°C, and the drying time is 2-4 hours, until the moisture content is less than 0.2%.

[0038] S3, crushing and screening: the dried waste plastic is sent to a crusher, sieved, and fragments with a particle size of less than 5 mm are obtained;

[0039] S4, mixing: adding plastic fragments, fiber reinforcement material, compatibilizer, flow improver, antioxidant, light stabilizer, flame retardant, crosslinking agent and lubricant into a high-speed mixer, and mixing at a speed of 500-800 r / min to obtain a premix;

[0040] S5, melt plasticization: add the premix into a twin-screw extruder, heat it to a molten state and plasticize it;

[0041] Among them, the rotation speed of the twin-screw extruder is 400-600r / min, and the residence time of the material in the extruder is 3-5min; the temperatures of the eight temperature zones are: zone one 190-200℃, zone two 200-210℃, zone three 210-220℃, zone four 210-220℃, zone five 220-230℃, zone six 220-230℃, zone seven 235-245℃, zone eight 235-245℃, and die head 235-245℃.

[0042] S6, cooling and pelletizing: The melt is extruded into a strip structure by an extruder, cooled and hardened by a water cooling tank, and then cut by a pelletizer to obtain modified plastic particles.

[0043] Among them, the water temperature in the water cooling tank is 10℃-20℃.

[0044] Example 2

[0045] like Figure 1 As shown, a plastic particle modified from waste plastic is made of the following raw materials in parts by weight: 100 parts of waste plastic flakes, 15 parts of fiber reinforcement material, 10 parts of compatibilizer, 10 parts of flow improver, 10 parts of antioxidant, 10 parts of light stabilizer, 10 parts of flame retardant, 5 parts of cross-linking agent and 5 parts of lubricant.

[0046] Wherein, the waste plastic flakes are selected from one or more mixtures of PET plastic, HDPE plastic and PP plastic.

[0047] Wherein, the fiber reinforcement material is selected from glass fiber, carbon fiber or a mixture of the two.

[0048] Wherein, the flow improver is selected from any one of silicone oil and zinc stearate.

[0049] Among them, the antioxidant is selected from any one of antioxidant 168, antioxidant 1010, and antioxidant 1076, the light stabilizer is selected from any one of benzophenone and benzotriazole ultraviolet absorbers, and the flame retardant is selected from one or a mixture of antimony trioxide, antimony pentoxide, and aluminum hydroxide.

[0050] Wherein, the cross-linking agent is selected from hexahydroxymethylmelamine hexamethyl ether, dicumyl peroxide or a mixture of the two, and the lubricant is selected from any one of sulphurized lard and calcium stearate.

[0051] The method for preparing the above-mentioned plastic particles modified from waste plastics comprises the following steps:

[0052] S1. Collection and classification of waste plastics: Collect waste PET, HDPE, and PP plastics from the market, and conduct preliminary classification according to the type, color, and transparency of the plastics to ensure that plastics of the same type are handled separately;

[0053] S2. Cleaning and drying: Put the sorted waste plastics into a cleaning tank, add an appropriate amount of cleaning agent, use an ultrasonic cleaning machine to remove dirt, labels and impurities on the surface, then rinse with clean water and place in an oven for drying;

[0054] The cleaning temperature is 40°C-60°C, and the cleaning time is 15-30 minutes; the oven drying temperature is 80°C-100°C, and the drying time is 2-4 hours, until the moisture content is less than 0.2%.

[0055] S3, crushing and screening: the dried waste plastic is sent to a crusher, sieved, and fragments with a particle size of less than 5 mm are obtained;

[0056] S4, mixing: adding plastic fragments, fiber reinforcement material, compatibilizer, flow improver, antioxidant, light stabilizer, flame retardant, crosslinking agent and lubricant into a high-speed mixer, and mixing at a speed of 500-800 r / min to obtain a premix;

[0057] S5, melt plasticization: add the premix into a twin-screw extruder, heat it to a molten state and plasticize it;

[0058] Among them, the rotation speed of the twin-screw extruder is 400-600r / min, and the residence time of the material in the extruder is 3-5min; the temperatures of the eight temperature zones are: zone one 190-200℃, zone two 200-210℃, zone three 210-220℃, zone four 210-220℃, zone five 220-230℃, zone six 220-230℃, zone seven 235-245℃, zone eight 235-245℃, and die head 235-245℃.

[0059] S6, cooling and pelletizing: The melt is extruded into a strip structure by an extruder, cooled and hardened by a water cooling tank, and then cut by a pelletizer to obtain modified plastic particles.

[0060] Among them, the water temperature in the water cooling tank is 10℃-20℃.

[0061] Example 3

[0062] like Figure 1 As shown, a plastic particle modified from waste plastic is made of the following raw materials in parts by weight: 100 parts of waste plastic flakes, 10 parts of fiber reinforcement material, 5 parts of compatibilizer, 6 parts of flow improver, 5 parts of antioxidant, 5 parts of light stabilizer, 5 parts of flame retardant, 3 parts of cross-linking agent and 3 parts of lubricant.

[0063] Wherein, the waste plastic flakes are selected from one or more mixtures of PET plastic, HDPE plastic and PP plastic.

[0064] Wherein, the fiber reinforcement material is selected from glass fiber, carbon fiber or a mixture of the two.

[0065] Wherein, the flow improver is selected from any one of silicone oil and zinc stearate.

[0066] Among them, the antioxidant is selected from any one of antioxidant 168, antioxidant 1010, and antioxidant 1076, the light stabilizer is selected from any one of benzophenone and benzotriazole ultraviolet absorbers, and the flame retardant is selected from one or a mixture of antimony trioxide, antimony pentoxide, and aluminum hydroxide.

[0067] Wherein, the cross-linking agent is selected from hexahydroxymethylmelamine hexamethyl ether, dicumyl peroxide or a mixture of the two, and the lubricant is selected from any one of sulphurized lard and calcium stearate.

[0068] The method for preparing the above-mentioned plastic particles modified from waste plastics comprises the following steps:

[0069] S1. Collection and classification of waste plastics: Collect waste PET, HDPE, and PP plastics from the market, and conduct preliminary classification according to the type, color, and transparency of the plastics to ensure that plastics of the same type are handled separately;

[0070] S2. Cleaning and drying: Put the sorted waste plastics into a cleaning tank, add an appropriate amount of cleaning agent, use an ultrasonic cleaning machine to remove dirt, labels and impurities on the surface, then rinse with clean water and place in an oven for drying;

[0071] The cleaning temperature is 40°C-60°C, and the cleaning time is 15-30 minutes; the oven drying temperature is 80°C-100°C, and the drying time is 2-4 hours, until the moisture content is less than 0.2%.

[0072] S3, crushing and screening: the dried waste plastic is sent to a crusher, sieved, and fragments with a particle size of less than 5 mm are obtained;

[0073] S4, mixing: adding plastic fragments, fiber reinforcement material, compatibilizer, flow improver, antioxidant, light stabilizer, flame retardant, crosslinking agent and lubricant into a high-speed mixer, and mixing at a speed of 500-800 r / min to obtain a premix;

[0074] S5, melt plasticization: add the premix into a twin-screw extruder, heat it to a molten state and plasticize it;

[0075] Among them, the rotation speed of the twin-screw extruder is 400-600r / min, and the residence time of the material in the extruder is 3-5min; the temperatures of the eight temperature zones are: zone one 190-200℃, zone two 200-210℃, zone three 210-220℃, zone four 210-220℃, zone five 220-230℃, zone six 220-230℃, zone seven 235-245℃, zone eight 235-245℃, and die head 235-245℃.

[0076] S6, cooling and pelletizing: The melt is extruded into a strip structure by an extruder, cooled and hardened by a water cooling tank, and then cut by a pelletizer to obtain modified plastic particles.

[0077] Among them, the water temperature in the water cooling tank is 10℃-20℃.

[0078] Comparative Example 1

[0079] Only the waste plastic flakes in Example 3 were used without adding any fiber reinforcement material, compatibilizer, flow improver, antioxidant, light stabilizer, flame retardant, crosslinking agent or lubricant.

[0080] The above preparation method follows the conventional waste plastic recycling and processing method, and is carried out through the steps of washing, drying, crushing, mixing and melt blending, but does not add any modifier or additive.

[0081] Comparative Example 2

[0082] In addition to using only the waste plastic flakes in Example 3, only a small amount of commonly used antioxidants and light stabilizers are added, and no fiber reinforcement materials, compatibilizers, flow improvers, flame retardants, crosslinking agents or lubricants are added.

[0083] The above preparation method also follows the conventional waste plastic recycling and processing method, but a small amount of antioxidant and light stabilizer are added in the mixing step to prevent oxidative degradation of the material during processing.

[0084] Test data and conclusions

[0085] In order to verify the effects of the waste plastic modified plastic particles and the preparation method thereof of the present invention, we conducted detailed performance tests. The specific test results are as follows:

[0086] (1) Tensile strength: The tensile strength of the plate was tested using the ASTM D638-2014 standard.

[0087] (2) Flexural strength: The flexural strength of the plate was tested using the ASTM D790-2017 standard.

[0088] (3) Impact strength: The impact strength of the plate was tested using standard ASTM D256-2010.

[0089] (4) Oxygen index: The oxygen index of the board is tested using standard GB / T 2406.2-2009.

[0090] Performance test results (see Table 1)

[0091] Table 1

[0092]

[0093]

[0094] in conclusion

[0095] It can be seen from Table 1 that the preparation of the fiber-modified waste plastic particles and the preparation method thereof in the embodiment can simultaneously improve the mechanical strength and flame retardant properties of the board.

[0096] The present invention adds fiber reinforcement materials (such as glass fiber, carbon fiber) and compatibilizers in a specific proportion, so that the modified particles of waste plastics show significantly improved mechanical properties in the molded products. Fiber reinforcement materials can effectively increase the strength and toughness of plastics, especially in terms of tensile strength, bending strength and impact strength. This not only makes the modified plastic particles suitable for manufacturing products with high requirements for mechanical properties, such as automotive parts, electronic and electrical housings, etc., but also greatly broadens its application range and meets the needs of more high-end markets. In addition, the addition of new flame retardants significantly improves the oxygen index of the sheet and enhances the flame retardant properties of the sheet; by introducing flow improvers (such as silicone oil, zinc stearate), these additives significantly improve the fluidity of the plastic melt, reduce the difficulty of processing, and enable the modified plastic particles to show better processability in molding processes such as injection molding and extrusion. Specifically, the flow improver reduces the friction and mold sticking of the plastic during processing, and avoids product defects caused by poor fluidity, such as surface flaws and inconsistent sizes. At the same time, good fluidity also means that lower processing temperatures and pressures can be used, thereby reducing energy consumption and equipment wear, and further reducing production costs. This is particularly important for large-scale industrial production, which can improve production efficiency, reduce scrap rate, and maximize economic benefits. In addition, the addition of compatibilizers improves the compatibility between different types of plastics, enhances the overall performance of composite materials, and ensures the stability and durability of materials in complex environments; through efficient cleaning, classification and modification, effective reuse of waste plastics is achieved, and the recycling rate of plastic resources is greatly improved. Traditional waste plastic recycling methods have problems such as low efficiency and unstable quality. The present invention converts discarded plastics such as PET, HDPE, PP into high-performance modified plastic particles through precisely controlled formula design and optimized processing parameters, which not only reduces the pollution of plastic waste to the environment, especially in the marine environment, but also provides a feasible solution to solve the global plastic waste problem. In addition, strict control of environmental conditions during the preparation process ensures that material properties are not affected by external factors, while also following the concept of green manufacturing, reducing the use of new raw materials, reducing carbon emissions, and meeting the requirements of sustainable development. This circular economy model helps alleviate the pressure of resource shortage and promotes social development in a more environmentally friendly and sustainable direction.

[0097] 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 plastic particle modified from waste plastics, characterized in that: The invention is prepared from the following raw materials in parts by weight: 100 parts of waste plastic flakes, 5-15 parts of fiber reinforcement materials, 1-10 parts of compatibilizers, 1-10 parts of flow improvers, 1-10 parts of antioxidants, 1-10 parts of light stabilizers, 1-10 parts of flame retardants, 0.5-5 parts of crosslinking agents and 0.5-5 parts of lubricants.

2. The plastic particles modified from waste plastics according to claim 1, characterized in that: The waste plastic flakes are selected from one or more mixtures of PET plastic, HDPE plastic, and PP plastic.

3. The plastic particles modified from waste plastics according to claim 1, characterized in that: The fiber reinforcement material is selected from glass fiber, carbon fiber or a mixture of the two.

4. The plastic particles modified from waste plastics according to claim 3, characterized in that: The flow improver is selected from any one of silicone oil and zinc stearate.

5. The plastic particles modified from waste plastics according to claim 1, characterized in that: The antioxidant is selected from any one of antioxidant 168, antioxidant 1010, and antioxidant 1076, the light stabilizer is selected from any one of benzophenone and benzotriazole ultraviolet absorbers, and the flame retardant is selected from one or a mixture of antimony trioxide, antimony pentoxide, and aluminum hydroxide.

6. The plastic particles modified from waste plastics according to claim 1, characterized in that: The cross-linking agent is selected from hexamethylol melamine hexamethicone, dicumyl peroxide or a mixture of the two, and the lubricant is selected from any one of sulfurized lard and calcium stearate.

7. The method for preparing plastic particles modified from waste plastics according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1. Collection and classification of waste plastics: Collect waste PET, HDPE, and PP plastics from the market, and conduct preliminary classification according to the type, color, and transparency of the plastics to ensure that plastics of the same type are handled separately; S2. Cleaning and drying: Put the sorted waste plastics into a cleaning tank, add an appropriate amount of cleaning agent, use an ultrasonic cleaning machine to remove dirt, labels and impurities on the surface, then rinse with clean water and place in an oven for drying; S3, crushing and screening: the dried waste plastic is sent to a crusher, sieved, and fragments with a particle size of less than 5 mm are obtained; S4, mixing: adding plastic fragments, fiber reinforcement material, compatibilizer, flow improver, antioxidant, light stabilizer, flame retardant, crosslinking agent and lubricant into a high-speed mixer, and mixing at a speed of 500-800 r / min to obtain a premix; S5, melt plasticization: add the premix into a twin-screw extruder, heat it to a molten state and plasticize it; S6, cooling and pelletizing: The melt is extruded into a strip structure by an extruder, cooled and hardened by a water cooling tank, and then cut by a pelletizer to obtain modified plastic particles.

8. The method for preparing plastic particles modified from waste plastics according to claim 7, characterized in that: In S2, the cleaning temperature is 40°C-60°C, and the cleaning time is 15-30 minutes; the oven drying temperature is 80°C-100°C, and the drying time is 2-4 hours, until the moisture content is less than 0.2%.

9. The method for preparing plastic particles modified from waste plastics according to claim 7, characterized in that: In the S5, the rotation speed of the twin-screw extruder is 400-600r / min, and the residence time of the material in the extruder is 3-5min; the temperatures of the eight temperature zones are: zone 1 190-200℃, zone 2 200-210℃, zone 3 210-220℃, zone 4 210-220℃, zone 5 220-230℃, zone 6 220-230℃, zone 7 235-245℃, zone 8 235-245℃, and die head 235-245℃.

10. The method for preparing plastic particles modified from waste plastics according to claim 7, characterized in that: In the step S6, the water temperature in the water cooling tank is 10°C-20°C.

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