Recycled modified plastic particles and process for producing the same

Abstract

The application belongs to the technical field of plastics, and particularly relates to a recycled modified plastic particle and a production process thereof. The recycled modified plastic particle is composed of the following components in parts by mass: 50-60 parts of waste polyethylene, 15-20 parts of waste polypropylene, 5-8 parts of POE elastomer, 7-12 parts of modified wollastonite, 4-8 parts of modified carbon fiber, 1-2 parts of stabilizer, 1-3 parts of coupling agent, and 0.5-1 part of lubricant. The recycled modified plastic particle prepared by the application has stable performance, good tensile strength and toughness.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of plastics, and particularly relates to a recycled modified plastic particle and a production process thereof. BACKGROUND

[0002] Polyolefin is often made into products such as packaging boxes, garbage cans and pipes due to its advantages such as environmental protection, high strength and long service life, and is applied to fields such as building materials, packaging and medical devices. With the application of polyolefin products, waste plastics are also generated.

[0003] Recycled plastic is plastic processed from waste plastic and used for original or other purposes. The recycled plastic is usually made of recycled plastic scraps or waste plastic products, and is obtained through pretreatment such as sorting, classification, cleaning and impurity removal, and physical and chemical treatment such as adding modifiers and melt granulation. The production of recycled plastic can alleviate the environmental pollution problem caused by waste plastic to some extent and save resources.

[0004] Due to the complexity and instability of the source of waste plastic, the performance of the plastic product is unstable, and there are often defects such as low strength, poor toughness and poor aging resistance. Therefore, it is necessary to modify the recycled plastic in the prior art to enhance its stability and performance.

[0005] A Chinese patent application file with the application publication number CN101798423A discloses a modified composite material using waste polypropylene plastic parts as raw materials and a preparation method thereof. The modified composite material is composed of the following components in percentage by weight: 0%-95% of polypropylene virgin material, 5%-100% of recycled PP, 0%-60% of filler, 0%-20% of toughening agent, 0%-1.5% of coupling agent, 0%-1% of heat stabilizer, 0%-1% of light stabilizer, 0%-1% of processing aid and 0%-1% of nucleating agent. In the technical solution, the filler is selected from substances such as talc powder and aluminum silicate whisker, and the amount range is relatively wide, up to 60%, which is easy to agglomerate and cause unstable performance, and the impact strength fluctuates greatly (3-40 KJ / m 2 ). SUMMARY

[0006] The existing recycled plastic has the problem of unbalanced toughness and rigidity. In order to solve the problem, the application provides a recycled modified plastic particle and a production process thereof.

[0007] In order to achieve the purpose of the application, the following technical solutions are adopted in the application:

[0008] The application provides a recycled modified plastic particle, which is composed of the following components in mass parts:

[0009] Waste polyethylene 50-60 parts, waste polypropylene 15-20 parts, POE elastomer 5-8 parts, modified wollastonite 7-12 parts, modified carbon fiber 4-8 parts, stabilizer 1-2 parts, coupling agent 1-3 parts, lubricant 0.5-1 part.

[0010] By adopting the above technical scheme, the POE elastomer, modified filler (wollastonite, carbon fiber) and the like in the recycled modified plastic particle formula are well compatible with the waste polyethylene and the waste polypropylene matrix, so that the problem of unstable performance caused by complex waste sources can be avoided; the modified wollastonite provides rigid support, and is compounded with the high-strength fiber network of the modified carbon fiber to improve the toughness and tensile strength of the material.

[0011] Preferably, the preparation method of the modified wollastonite comprises the following steps:

[0012] (1a) uniformly mixing acicular wollastonite with hydrochloric acid aqueous solution, filtering, washing, and drying to obtain W1;

[0013] (1b) adjusting the pH value of a dopamine hydrochloride solution to 8-9 with a TRIS buffer, uniformly mixing W1, filtering, washing, and drying to obtain P@W1;

[0014] (1c) uniformly mixing octadecylamine, P@W1 and anhydrous ethanol, adjusting the pH value to 5-6, and reacting under heating, filtering, washing, and drying to obtain modified wollastonite.

[0015] By adopting the above technical scheme, the hydroxyl density of the wollastonite surface after etching with hydrochloric acid is improved, the material tensile strength is improved through firm combination of the hydroxyl with dopamine through hydrogen bonds, the amino group and phenolic hydroxyl group of the formed polydopamine layer can be grafted with octadecylamine to form a hydrophobic coating layer, the interfacial tension with the polyethylene / polypropylene matrix is reduced, the agglomeration phenomenon is reduced, and the flexible segment of the octadecylamine can relieve the rigid and brittle effect of the wollastonite to improve the toughness.

[0016] Preferably, in the step (1a), the amount ratio of the acicular wollastonite to the hydrochloric acid aqueous solution is 1g:(10-15)mL, and the mass fraction of the hydrochloric acid aqueous solution is 10%.

[0017] By adopting the above technical scheme, too little amount of hydrochloric acid can lead to insufficient hydroxylation, resulting in a decrease in grafting rate; too much amount of hydrochloric acid can lead to excessive etching, affecting the performance.

[0018] Preferably, in the step (1b), the concentration of the dopamine hydrochloride solution is 1g / L, and the amount ratio of the dopamine hydrochloride solution to W1 is 100mL:(5-8)g.

[0019] By adopting the above technical scheme, too little amount of dopamine hydrochloride can lead to a too thin and uneven coating layer, and too little amount of dopamine hydrochloride can lead to self-agglomeration of dopamine, affecting dispersibility.

[0020] Preferably, in the step (1c), the dosage ratio of octadecylamine, P@W1 and anhydrous ethanol is 1g:(18-24)g:(400-500)mL.

[0021] By adopting the above technical scheme, the reaction is moderate at this dosage, and the grafting uniformity is good.

[0022] Preferably, in the step (1c), the reaction temperature is 80-90℃, and the reaction time is 6-8h.

[0023] By adopting the above technical scheme, the reaction is slow when the reaction temperature is too low, and the octadecylamine is easily decomposed when the reaction temperature is too high.

[0024] Preferably, the preparation method of the modified carbon fiber comprises the following steps:

[0025] (2a) uniformly mixing carbon fiber with concentrated nitric acid, washing, drying to obtain activated carbon fiber;

[0026] (2b) uniformly mixing stearic acid, ethanol and toluene, adjusting pH to 5-6, adding activated carbon fiber for ultrasonic treatment, and drying to obtain modified carbon fiber.

[0027] By adopting the above technical scheme, the long-chain alkyl of stearic acid is grafted to the surface of the carbon fiber to form a hydrophobic coating layer, thereby reducing the interfacial tension; the flexible alkyl chain of stearic acid can be crosslinked with the molecular chain of polyethylene / polypropylene to improve the tensile strength of the material.

[0028] Preferably, in the step (2a), the mass fraction of concentrated nitric acid is 68%, and the dosage ratio of carbon fiber and concentrated nitric acid is 1g:(10-13)mL.

[0029] By adopting the above technical scheme, the concentrated nitric acid can remove the oxides on the surface of the carbon fiber at this dosage while providing active sites for stearic acid grafting.

[0030] Preferably, in the step (2b), the dosage ratio of stearic acid, ethanol, toluene and activated carbon fiber is (1-2)g:10mL:10mL:1g.

[0031] By adopting the above technical scheme, too much stearic acid is easy to form micelles by self-aggregation, resulting in uneven thickness of the coating layer; too little stearic acid results in low coverage and easy stress concentration in the exposed area, thereby reducing the performance.

[0032] Preferably, the ultrasonic temperature is 60-65℃, and the ultrasonic time is 20-30min.

[0033] By adopting the above technical scheme, the reaction rate is fast within this temperature and time range and the carbon fiber is not damaged.

[0034] Preferably, the stabilizer is a mixture of antioxidant 1010, antioxidant 168 and diethylenetriamine pentaacetic acid in a ratio of (2-4):(1-2):1.

[0035] By adopting the technical scheme, the antioxidant 1010 is a main antioxidant, the antioxidant 168 is an auxiliary antioxidant, and the two can improve the antioxidant efficiency after compounding; the diethylenetriamine pentaacetic acid as a chelating agent can form a stable complex with the metal ions remaining in the regenerated plastic to inhibit the catalytic oxidation effect.

[0036] In a second aspect, the present application provides a production process of the regenerated modified plastic particles, including the following steps:

[0037] S1: the waste polyethylene and the waste polypropylene are immersed in a sodium hydroxide aqueous solution, washed, dried, crushed, and granulated to obtain a granular material;

[0038] S2: the granular material, the POE elastomer, the modified wollastonite, the modified carbon fiber, the stabilizer, the coupling agent and the lubricant are stirred uniformly in a stirring machine, transferred to a double screw extruder for melting, extrusion, drying and granulation to obtain the regenerated modified plastic particles.

[0039] By adopting the technical scheme, the oil stains and coatings on the surface of the waste plastic are removed by the sodium hydroxide aqueous solution, so as to avoid performance fluctuations caused by impurities; the production process is simple and has good processing stability.

[0040] In summary, the present application has the following advantages:

[0041] (1) The present application uses waste polyethylene and waste polypropylene as the matrix, and the modified wollastonite, the modified carbon fiber and the POE elastomer are used to improve the tensile strength and toughness of the material, and the modified carbon fiber can inhibit the expansion of micro-cracks and cooperate with the stabilizer to inhibit oxidative degradation and improve the anti-aging performance of the material.

[0042] (2) The present application uses the coating of dopamine layer and the grafting of octadecylamine to prepare the modified wollastonite, so that the modified wollastonite exhibits excellent mechanical properties, thermal stability and processing fluidity in the material.

[0043] (3) The present application uses the method of stearic acid coating to prepare the modified carbon fiber, so that the modified carbon fiber retains the high strength of carbon fiber, and the interface modification of stearic acid improves the compatibility of the carbon fiber with the waste polyethylene / waste polypropylene matrix. DETAILED DESCRIPTION

[0044] The technical scheme of the present application will be described in detail below with reference to several representative embodiments of the present application.

[0045] The experimental methods used in the following examples and comparative examples are conventional methods unless otherwise specified. The materials, reagents, etc. used in the following examples and comparative examples are commercially available unless otherwise specified.

[0046] Preparation Example 1

[0047] The preparation method of the modified wollastonite in this preparation example is as follows:

[0048] (1a) 10 g of acicular wollastonite was mixed with 150 mL of 10% hydrochloric acid aqueous solution, warmed to 60°C and stirred for 2 h, filtered, washed with deionized water for 5 times, and placed in a vacuum drying oven at 80°C for 12 h to obtain W1;

[0049] (1b) 200 mL of 1 g / L dopamine hydrochloride aqueous solution was adjusted to pH 8 with TRIS buffer, 12 g of W1 was added, stirred at room temperature for 24 h, filtered, washed with anhydrous ethanol for 5 times, and placed in a vacuum drying oven at 60°C for 12 h to obtain P@W1;

[0050] (1c) 0.5 g of octadecylamine was added to 220 mL of anhydrous ethanol, warmed to 60°C and stirred for 20 min, 10 g of P@W1 was added, adjusted to pH 6, warmed to 85°C and reacted for 8 h, filtered, washed with n-hexane for 5 times, and placed in a vacuum drying oven at 60°C for 12 h to obtain the modified wollastonite.

[0051] Preparation Example 2

[0052] The preparation method of the modified wollastonite in this preparation example is as follows:

[0053] (1a) 10 g of acicular wollastonite was mixed with 130 mL of 10% hydrochloric acid aqueous solution, warmed to 60°C and stirred for 2 h, filtered, washed with deionized water for 5 times, and placed in a vacuum drying oven at 80°C for 12 h to obtain W1;

[0054] (1b) 200 mL of 1 g / L dopamine hydrochloride aqueous solution was adjusted to pH 8.5 with TRIS buffer, 16 g of W1 was added, stirred at room temperature for 24 h, filtered, washed with anhydrous ethanol for 5 times, and placed in a vacuum drying oven at 60°C for 12 h to obtain P@W1;

[0055] (1c) 0.5 g of octadecylamine was added to 200 mL of anhydrous ethanol, warmed to 60°C and stirred for 20 min, 9 g of P@W1 was added, adjusted to pH 5, warmed to 80°C and reacted for 7 h, filtered, washed with n-hexane for 5 times, and placed in a vacuum drying oven at 60°C for 12 h to obtain the modified wollastonite.

[0056] Preparation Example 3

[0057] A preparation method of the modified wollastonite of the present preparation example is as follows:

[0058] (1a) 10 g of acicular wollastonite was mixed with 100 mL of 10% hydrochloric acid aqueous solution, heated to 60°C and stirred for 2 h, filtered, washed with deionized water for 5 times, and dried in a vacuum drying oven at 80°C for 12 h to obtain W1;

[0059] (1b) 200 mL of 1 g / L dopamine hydrochloride aqueous solution was adjusted to pH 8.3 with TRIS buffer, 10 g of W1 was added and stirred at room temperature for 24 h, filtered, washed with anhydrous ethanol for 5 times, and dried in a vacuum drying oven at 60°C for 12 h to obtain P@W1;

[0060] (1c) 0.5 g of octadecylamine was added to 250 mL of anhydrous ethanol, heated to 60°C and stirred for 20 min, 12 g of P@W1 was added, the pH was adjusted to 5, heated to 90°C and reacted for 6 h, filtered, washed with n-hexane for 5 times, and dried in a vacuum drying oven at 60°C for 12 h to obtain the modified wollastonite.

[0061] Preparation Example 4

[0062] A preparation method of the modified carbon fiber of the present preparation example is as follows:

[0063] (2a) 10 g of carbon fiber was mixed with 100 mL of 68% concentrated nitric acid, heated to 60°C and stirred for 3 h, washed with deionized water, and dried in a vacuum drying oven at 80°C for 6 h to obtain activated carbon fiber;

[0064] (2b) 10 g of stearic acid, 50 mL of ethanol and 50 mL of toluene were mixed, heated to 60°C and stirred for 30 min, the pH was adjusted to 5, 5 g of activated carbon fiber was added and ultrasonicated at 65°C for 25 min, and dried in a vacuum drying oven at 60°C for 6 h to obtain the modified carbon fiber.

[0065] Preparation Example 5

[0066] A preparation method of the modified carbon fiber of the present preparation example is as follows:

[0067] (2a) 10 g of carbon fiber was mixed with 130 mL of 68% concentrated nitric acid, heated to 60°C and stirred for 3 h, washed with deionized water, and dried in a vacuum drying oven at 80°C for 6 h to obtain activated carbon fiber;

[0068] (2b) 10 g of stearic acid, 50 mL of ethanol and 50 mL of toluene were mixed, heated to 60°C and stirred for 30 min, the pH was adjusted to 6, 5 g of activated carbon fiber was added and ultrasonicated at 63°C for 30 min, and dried in a vacuum drying oven at 60°C for 6 h to obtain the modified carbon fiber.

[0069] Preparation Example 6

[0070] The preparation method of the modified carbon fiber in the present preparation example is as follows:

[0071] (2a) 10 g of carbon fiber was mixed with 110 mL of concentrated nitric acid with a mass fraction of 68%, heated to 60°C and stirred for 3 h, washed with deionized water, and placed in a vacuum drying oven at 80°C for 6 h to obtain activated carbon fiber;

[0072] (2b) 8 g of stearic acid, 50 mL of ethanol and 50 mL of toluene were mixed, heated to 60°C and stirred for 30 min, the pH was adjusted to 6, 5 g of activated carbon fiber was added and ultrasonicated at 60°C for 20 min, and then placed in a vacuum drying oven at 60°C for 6 h to obtain modified carbon fiber.

[0073] Example 1

[0074] The regenerated modified plastic particles in the present example are composed of the following components by mass:

[0075] 5.5 kg of waste polyethylene, 1.8 kg of waste polypropylene, 0.8 kg of POE elastomer, 1 kg of modified wollastonite prepared in Preparation Example 1, 0.6 kg of modified carbon fiber prepared in Preparation Example 4, 0.04 kg of antioxidant 1010, 0.04 kg of antioxidant 168, 0.02 kg of diethyl triamine pentaacetic acid, 0.3 kg of coupling agent KH-550, and 0.08 kg of polyethylene wax.

[0076] The production process of the regenerated modified plastic particles in the present application is as follows:

[0077] S1: 5.5 kg of waste polyethylene and 1.8 kg of waste polypropylene were placed in a 15% sodium hydroxide aqueous solution and water immersed for 2 h, washed with deionized water for 5 times, placed in a vacuum drying oven at 50°C for 6 h, and then crushed to obtain granular material;

[0078] S2: The granular material, 0.8 kg of POE elastomer, 1 kg of modified wollastonite, 0.6 kg of modified carbon fiber, 0.04 kg of antioxidant 1010, 0.04 kg of antioxidant 168, 0.02 kg of diethyl triamine pentaacetic acid, 0.3 kg of coupling agent KH-550, and 0.08 kg of polyethylene wax were added into a stirrer and stirred uniformly, then transferred into a twin-screw extruder, the six-zone temperature of the twin-screw extruder was 190°C, 210°C, 230°C, 240°C, 255°C, and 245°C in sequence, the screw rotation speed was 350 r / min, and then extruded, dried, and granulated to obtain regenerated modified plastic particles.

[0079] Example 2

[0080] A kind of recycled modified plastic particles of this embodiment, by the following mass components are made up of:

[0081] Waste polyethylene 5kg, waste polypropylene 2kg, POE elastomer 0.5kg, modified wollastonite prepared in preparation example 3 0.7kg, modified carbon fiber prepared in preparation example 5 0.8kg, antioxidant 1010 0.12kg, antioxidant 168 0.04kg, diethyl triamine pentaacetic acid 0.04kg, coupling agent KH-550 0.1kg, polyethylene wax 0.05kg.

[0082] A kind of production process of recycled modified plastic particles of the present application, the specific steps are as follows:

[0083] S1: 5kg waste polyethylene and 2kg waste polypropylene are placed in 15% sodium hydroxide aqueous solution, water immersion 2h, deionized water is washed 5 times, is placed in vacuum drying oven and is dried at 50 DEG C for 6h, is crushed, and granular material is obtained;

[0084] S2: granular material, 0.5kg POE elastomer, 0.7kg modified wollastonite, 0.8kg modified carbon fiber, 0.12kg antioxidant 1010, 0.04kg antioxidant 168, 0.04kg diethyl triamine pentaacetic acid, 0.1kg coupling agent KH-550 and 0.05kg polyethylene wax are added to the stirrer and stirred uniformly, are transferred to the twin-screw extruder and melt, the six-zone temperature of the twin-screw extruder is 190 DEG C, 210 DEG C, 230 DEG C, 240 DEG C, 255 DEG C, 245 DEG C in turn, the screw rotation speed is 350r / min, extrusion, drying, granulation, and recycled modified plastic particles are obtained.

[0085] Example 3

[0086] A kind of recycled modified plastic particles of this embodiment, by the following mass components are made up of:

[0087] Waste polyethylene 6kg, waste polypropylene 1.5kg, POE elastomer 0.7kg, modified wollastonite prepared in preparation example 2 1.2kg, modified carbon fiber prepared in preparation example 6 0.4kg, antioxidant 1010 0.12kg, antioxidant 168 0.03kg, diethyl triamine pentaacetic acid 0.03kg, coupling agent KH-550 0.2kg, polyethylene wax 0.1kg.

[0088] A kind of production process of recycled modified plastic particles of the present application, the specific steps are as follows:

[0089] S1: 6kg waste polyethylene and 1.5kg waste polypropylene are placed in 15% sodium hydroxide aqueous solution, water immersion 2h, deionized water is washed 5 times, is placed in vacuum drying oven and is dried at 50 DEG C for 6h, is crushed, and granular material is obtained;

[0090] S2: The granules, 0.7 kg of POE elastomer, 1.2 kg of modified wollastonite, 0.4 kg of modified carbon fiber, 0.12 kg of antioxidant 1010, 0.03 kg of antioxidant 168, 0.03 kg of diethylenetriamine pentaacetate, 0.2 kg of coupling agent KH-550, and 0.1 kg of polyethylene wax were added into a blender and stirred uniformly, transferred into a twin-screw extruder, and melted. The six-zone temperature of the twin-screw extruder was 190°C, 210°C, 230°C, 240°C, 255°C, and 245°C, respectively. The screw rotation speed was 350 r / min. After extrusion, drying, and granulation, the regenerated modified plastic granules were obtained.

[0091] Comparative Example 1

[0092] The difference between this comparative example and Example 1 is that no modified wollastonite and no modified carbon fiber are added in this comparative example.

[0093] Comparative Example 2

[0094] The difference between this comparative example and Example 1 is that no modified wollastonite is added in this comparative example.

[0095] Comparative Example 3

[0096] The difference between this comparative example and Example 1 is that no modified carbon fiber is added in this comparative example.

[0097] Comparative Example 4

[0098] The difference between this comparative example and Example 1 is that the same amount of wollastonite and carbon fiber are used to replace the modified wollastonite and the modified carbon fiber.

[0099] Comparative Example 5

[0100] The difference between this comparative example and Example 1 is that one kind of regenerated modified plastic granules in this comparative example is composed of the following components with the following mass:

[0101] Waste polyethylene 5.5 kg, waste polypropylene 1.8 kg, POE elastomer 0.8 kg, modified wollastonite prepared in Preparation Example 1 1.6 kg, modified carbon fiber prepared in Preparation Example 4 0.2 kg, antioxidant 1010 0.16 kg, antioxidant 168 0.04 kg, diethylenetriamine pentaacetate 0.02 kg, coupling agent KH-550 0.3 kg, and polyethylene wax 0.08 kg.

[0102] Comparative Example 6

[0103] The difference between this comparative example and Example 1 is that one kind of regenerated modified plastic granules in this comparative example is composed of the following components with the following mass:

[0104] Waste polyethylene 8 kg, waste polypropylene 0.3 kg, POE elastomer 0.2 kg, modified wollastonite prepared in Preparation Example 1 1.6 kg, modified carbon fiber prepared in Preparation Example 4 0.2 kg, antioxidant 1010 0.16 kg, antioxidant 168 0.04 kg, diethylenetriamine pentaacetic acid 0.02 kg, coupling agent KH-550 0.3 kg, polyethylene wax 0.02 kg.

[0105] Related performance test

[0106] The recycled modified plastic particles obtained in Examples 1-3 and Comparative Examples 1-6 were sampled and injection molded to prepare samples, and the tensile strength and notched impact strength of the samples were tested according to GB / T 1040-2006 and GB / T 1043-2008. The test results are shown in Table 1.

[0107] Table 1 Test results

[0108]

[0109] As can be seen from Table 1, the recycled modified plastic particles prepared by the present application have stable performance, good tensile strength and toughness.

[0110] The above has exemplarily described the present application, it should be explained that, without departing from the core of the present application, any simple transformation, modification or other equivalent replacement which can not cost creative labor of the person skilled in the art, all fall into the protection scope of the present application.

Claims

1. Recycled modified plastic particles, characterized in that, It is composed of the following components by mass fraction: Waste polyethylene 50-60 parts, waste polypropylene 15-20 parts, POE elastomer 5-8 parts, modified wollastonite 7-12 parts, modified carbon fiber 4-8 parts, stabilizer 1-2 parts, coupling agent 1-3 parts, lubricant 0.5-1 part; The preparation method of the modified wollastonite comprises the following steps: (1a) The acicular wollastonite is uniformly mixed with hydrochloric acid aqueous solution, filtered, washed, and dried to obtain W1; (1b) The dopamine hydrochloride solution is adjusted to a pH value of 8-9 with a TRIS buffer, and then W1 is added and uniformly mixed, filtered, washed, and dried to obtain P@W1; (1c) The octadecylamine, P@W1, and anhydrous ethanol are uniformly mixed, the pH value is adjusted to 5-6, and then the mixture is reacted at an elevated temperature, filtered, washed, and dried to obtain the modified wollastonite; The preparation method of the modified carbon fiber comprises the following steps: (2a) The carbon fiber is uniformly mixed with concentrated nitric acid, washed, and dried to obtain the activated carbon fiber; (2b) The stearic acid, ethanol, and toluene are uniformly mixed, the pH value is adjusted to 5-6, the activated carbon fiber is added and ultrasonically treated, and then the mixture is dried to obtain the modified carbon fiber.

2. The recycled modified plastic particles according to claim 1, characterized in that, In the step (1a), the amount ratio of the acicular wollastonite to the hydrochloric acid aqueous solution is 1g:(10-15)mL, and the mass fraction of the hydrochloric acid aqueous solution is 10%.

3. The recycled modified plastic particles of claim 1, wherein, In the step (1b), the concentration of the dopamine hydrochloride solution is 1g / L, and the amount ratio of the dopamine hydrochloride solution to W1 is 100mL:(5-8)g.

4. The recycled modified plastic particles of claim 1, wherein, In the step (1c), the amount ratio of the octadecylamine, P@W1, and anhydrous ethanol is 1g:(18-24)g:(400-500)mL; the reaction temperature is 80-90℃, and the reaction time is 6-8h.

5. The recycled modified plastic particles of claim 1, wherein, In the step (2a), the mass fraction of the concentrated nitric acid is 68%, and the amount ratio of the carbon fiber to the concentrated nitric acid is 1g:(10-13)mL.

6. The recycled modified plastic particles of claim 1, wherein, In the step (2b), the amount ratio of the stearic acid, ethanol, toluene, and activated carbon fiber is (1-2)g:10mL:10mL:1g; the ultrasonic temperature is 60-65℃, and the ultrasonic time is 20-30min.

7. The recycled modified plastic particles of claim 1, wherein, The stabilizer is prepared by mixing antioxidant 1010, antioxidant 168, and diethylenetriamine pentaacetic acid in a ratio of (2-4):(1-2):

1.

8. A process for the production of recycled modified plastic particles according to any one of claims 1-7, characterized in that, The method comprises the following steps: S1: The waste polyethylene and waste polypropylene are immersed in a sodium hydroxide aqueous solution, washed, dried, and crushed to obtain granules; S2: The granules, POE elastomer, modified wollastonite, modified carbon fiber, stabilizer, coupling agent, and lubricant are uniformly stirred in a blender, transferred to a twin-screw extruder, melted, extruded, dried, and granulated to obtain regenerated modified plastic particles.

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