A composite material based on recycled polycarbonate and ABS and its preparation method

Abstract

The present invention discloses a composite material based on recycled polycarbonate and ABS and a preparation method thereof, belonging to the technical field of composite materials. The present invention uses recycled polycarbonate drinking water barrels as the source of polycarbonate and utilizes antioxidants and plasticizers to enhance thermal stability. Ammonium bicarbonate is used as an electrolyte and an electrochemical method is used to oxidize the surface of carbon fibers to increase the number of active oxygen-containing functional groups on the carbon fibers. The hydroxyl groups of glycerol and the carboxyl groups on the carbon fibers undergo an esterification reaction to introduce more hydroxyl groups to the carbon fibers. Maleic acid is grafted onto ABS plastic according to the mechanism of free radical polymerization. The carboxyl groups on the maleic acid react with the hydroxyl groups on the carbon fibers to form an esterification reaction, thereby grafting the carbon fibers onto the ABS plastic and enhancing the mechanical properties of the ABS plastic. Finally, the compatibilizer, polycarbonate, and ABS plastic are physically blended and hot-pressed together to obtain a composite material having excellent mechanical properties and good flame retardancy.

Description

Technical Field

[0001] The present invention relates to the technical field of composite materials, in particular to a composite material based on recycled polycarbonate and ABS and a preparation method thereof. Background Art

[0002] Polycarbonate is an engineering plastic with excellent overall performance. It boasts high mechanical strength, a wide operating temperature range, good dimensional stability, and exceptional heat and weather resistance. It can be used in the production of optical discs, signage, packaging bottles (containers), and medical devices. It also has broad application prospects in various industrial fields, including machinery, construction, automotive, and electronics. With the continuous increase in production and demand, a large amount of waste is generated. Because polycarbonate is difficult to degrade in nature, and existing recycling methods have their own shortcomings, finding an effective way to recycle polycarbonate waste is crucial.

[0003] During storage, processing and daily use, polycarbonate materials are susceptible to aging and degradation due to the effects of heat, light and oxygen, which seriously affects the performance of recycled plastics. The composite fillers, plasticizers, stabilizers and other additives added to improve performance will also cause the molecular structure monomers of plastic products to be tightly combined, causing changes in the interaction between the molecular structure monomers of recycled plastic products. In addition, the plastic itself undergoes oxidation and decomposition during the remelting process, and even other chemical reactions will occur, which will cause the quality of recycled plastic products to decline, and industrial applications are not satisfactory. Therefore, it is necessary to modify the recycled polycarbonate plastic to obtain plastic raw materials with better performance.

[0004] To this end, the present invention develops a composite material based on recycled polycarbonate to achieve the purpose of processing plastic waste into recycled engineering plastics. Summary of the Invention

[0005] In view of the deficiencies of the prior art, the present invention provides a method for preparing a composite material based on recycled polycarbonate and ABS, thereby improving the mechanical properties of the composite material.

[0006] In order to solve the above problems, the technical solutions adopted by the present invention are as follows:

[0007] A method for preparing a composite material based on recycled polycarbonate and ABS, the preparation method is as follows:

[0008] (1) After washing, drying and crushing the recovered polycarbonate products, the crushed materials are melt-extruded and granulated, and the obtained coarse polycarbonate particles are kneaded with ascorbic acid and di-n-octyl phthalate and granulated to obtain polycarbonate particles;

[0009] (2) Surface oxidation treatment of carbon fibers is performed using an electrochemical oxidation device to obtain oxidized carbon fibers;

[0010] (3) Dispersing the oxidized carbon fibers in water, then adding ethanol and glycerol, and distilling under reduced pressure at 85-95°C. After the distillation is completed, adding thionyl chloride dropwise at 0-4°C, and reacting at 40-60°C for 1-5 hours. After the reaction is completed, distilling and washing to obtain polyhydroxylated carbon fibers;

[0011] (4) Add ABS plastic to a flask and dissolve it with 1,2-dichloroethane under a nitrogen atmosphere. After complete dissolution, add maleic acid and dibenzoyl peroxide to the flask, condense and reflux at 70-90°C for 30-90 minutes, then add the reacted mixture to boiling distilled water with vigorous stirring. After 1-5 hours, filter, wash and dry to obtain maleic acid-modified ABS plastic;

[0012] (5) Dissolve the polyhydroxylated carbon fiber in N-methylpyrrolidone, add pyridine bisulfate while stirring at 60-80°C, continue stirring for 20-40 minutes, then add maleic acid-modified ABS plastic and react for 8-12 hours, then filter, wash, and dry to obtain carbon fiber modified ABS plastic;

[0013] (6) The polycarbonate particles, carbon fiber modified ABS plastic and compatibilizer are mixed, melt-extruded, granulated and dried to obtain the composite material.

[0014] Preferably, in step (1), the mass ratio of the coarse polycarbonate particles, ascorbic acid and di-n-octyl phthalate is 10:(1.4-2.2):(8-13).

[0015] Preferably, in step (3), the mass ratio of oxidized carbon fiber, propylene glycol and thionyl chloride is (1-2): (230-280): (80-120).

[0016] Preferably, in step (4), the mass ratio of ABS plastic, maleic acid and dibenzoyl peroxide is 10:(3-8):(0.2-1.2).

[0017] Preferably, in step (5), the mass ratio of the polyhydroxylated carbon fiber, the maleic acid-modified ABS plastic, and the pyridine bisulfate is 100:(130-180):(8-16).

[0018] Preferably, in step (6), the mass ratio of polycarbonate, carbon fiber modified ABS plastic and compatibilizer is (65-75): (25-35): (6-12).

[0019] Preferably, the compatibilizer in step (6) is selected from one of styrene maleic anhydride copolymer and maleic anhydride grafted ABS.

[0020] The composite material based on recycled polycarbonate and ABS is prepared by the above method.

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

[0022] (1) Recycled polycarbonate plastic is used as the source of polycarbonate to reduce costs and protect the environment. Antioxidants and plasticizers are used to enhance thermal stability, making it easier to process and improve polycarbonate in the future.

[0023] (2) The high viscosity of polycarbonate makes it unfavorable for compounding with carbon fiber. The present invention uses ammonium bicarbonate as an electrolyte and utilizes an electrochemical method to oxidize the surface of the carbon fiber to increase the active oxygen-containing functional groups on the surface of the carbon fiber, which is convenient for subsequent polyhydroxylation modification; the hydroxyl groups of glycerol and the carboxyl groups on the surface of the carbon fiber are used to undergo an esterification reaction to introduce more hydroxyl groups into the carbon fiber; maleic acid is grafted onto ABS plastic according to the mechanism of free radical polymerization, and the carbon fiber is grafted onto the ABS plastic by utilizing the esterification reaction between the carboxyl groups on the maleic acid and the hydroxyl groups on the carbon fiber to enhance the mechanical properties of the ABS plastic.

[0024] (3) By utilizing the reaction between maleic anhydride and terminal hydroxyl groups and terminal carboxyl groups and the principle of similar compatibility, a compatibilizer is used to physically blend polycarbonate and ABS plastic and then hot-press them together. This not only overcomes the difficult processing characteristics of polycarbonate, but also overcomes the shortcomings of ABS plastic in terms of poor heat resistance and weather resistance. The resulting composite material has excellent mechanical properties and good flame retardant properties. DETAILED DESCRIPTION

[0025] The present invention will be further described below with reference to specific embodiments.

[0026] Source of raw materials:

[0027] Recycled polycarbonate products: PC drinking water barrels, manufactured by Jinan Suyan Plastic Products Co., Ltd., and produced between 2010 and 2012.

[0028] Carbon fiber: brand SYT45S, produced by Zhongfu Shenying Carbon Fiber Company.

[0029] ABS plastic: PA-758, manufacturer: Chimei Chemical.

[0030] Styrene maleic anhydride copolymer: Yisu SME-098, Shenzhen Pasteur New Material Technology Co., Ltd.

[0031] Maleic anhydride grafted ABS: brand 335K, Total.

[0032] The remaining raw materials are commercially available conventional chemicals.

[0033] Example 1

[0034] (1) After the recycled polycarbonate drinking water barrels were shredded and dried, the shredded materials were melt-extruded and granulated using a twin-screw extruder. Then, 5 g of the obtained polycarbonate coarse granules were kneaded with 1.1 g of ascorbic acid and 4 g of di-n-octyl phthalate and granulated to obtain polycarbonate granules;

[0035] (2) Using 2 wt.% ammonium bicarbonate as electrolyte, carbon fiber as anode, and graphite plate as cathode, the carbon fiber is surface oxidized using an electrochemical oxidation device. After the treatment, the carbon fiber is washed with deionized water multiple times to obtain oxidized carbon fiber;

[0036] (3) 0.5 g of oxidized carbon fiber was ultrasonically dispersed in distilled water in a rotary evaporation flask, and then anhydrous ethanol and 140 g of propylene glycol were added. The mixture was vacuum-evaporated in a water bath at 85 ° C. After the distillation, the mixture was transferred to a round-bottom flask, and 40 g of thionyl chloride was added dropwise in a water bath at 4 ° C. After the addition was completed, the oil bath was heated to 60 ° C for 1 h, and the mixture was rotary distilled in a water bath at 80 ° C. The product was then washed with distilled water several times to obtain polyhydroxylated carbon fiber.

[0037] (4) 2.5 g of ABS plastic was added to a flask and dissolved with 1,2-dichloroethane under a nitrogen atmosphere. After complete dissolution, 1.5 g of maleic acid and 0.24 g of dibenzoyl peroxide were added to the flask. The mixture was refluxed at 80 °C for 60 min, and then the reaction mixture was added to boiling distilled water with vigorous stirring. After 3 h, the mixture was filtered, washed with hot distilled water 3 times, and then vacuum dried to obtain maleic acid-modified ABS plastic.

[0038] (5) Dissolve 10 g of polyhydroxylated carbon fiber in N-methylpyrrolidone, add 1.6 g of catalyst pyridine hydrogen sulfate while stirring at 70 °C, continue stirring for 30 min, then add 18 g of maleic acid-modified ABS plastic and react for 12 h, then filter, wash, and dry at 60 °C to obtain carbon fiber modified ABS plastic;

[0039] (6) 13 g of polycarbonate pellets were dried at 110 °C for 10 h, 5 g of carbon fiber modified ABS plastic and 1.2 g of maleic anhydride grafted ABS were dried at 70 °C for 5 h, and then the three were mixed, melt extruded and granulated using a twin-screw extruder. After the pellets were dried at 90 °C for 10 h, standard specimens were made on an injection molding machine to obtain a composite material based on recycled polycarbonate and ABS.

[0040] Example 2

[0041] (1) After the recycled polycarbonate drinking water barrels were shredded and dried, the shredded materials were melt-extruded and granulated using a twin-screw extruder. Then, 5 g of the obtained polycarbonate coarse granules were kneaded with 0.9 g of ascorbic acid and 5.6 g of di-n-octyl phthalate and granulated to obtain polycarbonate granules;

[0042] (2) Using 7 wt.% ammonium bicarbonate as electrolyte, carbon fiber as anode, and graphite plate as cathode, the carbon fiber is surface oxidized using an electrochemical oxidation device. After the treatment, the carbon fiber is washed with deionized water multiple times to obtain oxidized carbon fiber;

[0043] (3) 0.8 g of oxidized carbon fiber was ultrasonically dispersed in distilled water in a rotary evaporation bottle, and then anhydrous ethanol and 132 g of propylene glycol were added. The mixture was vacuum-evaporated in a water bath at 90 ° C. After the distillation, the mixture was transferred to a round-bottom flask, and 50 g of thionyl chloride was added dropwise in a water bath at 2 ° C. After the addition was completed, the oil bath was heated to 50 ° C and reacted for 3 h. The product was rotary distilled in a water bath at 75 ° C, and then washed with distilled water several times to obtain polyhydroxylated carbon fiber.

[0044] (4) 2.5 g of ABS plastic was added to a flask and dissolved with 1,2-dichloroethane under a nitrogen atmosphere. After complete dissolution, 1.5 g of maleic acid and 0.25 g of dibenzoyl peroxide were added to the flask. The mixture was refluxed at 80 °C for 90 min, and then the reaction mixture was added to boiling distilled water with vigorous stirring. After 2 h, the mixture was filtered, washed with hot distilled water 4 times, and then vacuum dried to obtain maleic acid-modified ABS plastic.

[0045] (5) Dissolve 10 g of polyhydroxylated carbon fiber in N-methylpyrrolidone, add 1.6 g of catalyst pyridine hydrogen sulfate while stirring at 60 °C, continue stirring for 20 min, then add 18 g of maleic acid-modified ABS plastic and react for 8 h, then filter, wash, and dry at 70 °C to obtain carbon fiber modified ABS plastic;

[0046] (6) 15 g of polycarbonate was dried at 120 °C for 14 h, 7 g of carbon fiber modified ABS plastic and 2.4 g of styrene maleic anhydride copolymer were dried at 80 °C for 10 h, and then the three were mixed, melt-extruded and granulated using a twin-screw extruder. The pellets were dried at 110 °C for 16 h and then made into standard samples on an injection molding machine to obtain a composite material based on recycled polycarbonate and ABS.

[0047] Example 3

[0048] (1) After the recycled polycarbonate drinking water barrels were shredded and dried, the shredded materials were melt-extruded and granulated using a twin-screw extruder. 5 g of the obtained coarse polycarbonate granules were then kneaded with 1.1 g of ascorbic acid and 6.8 g of di-n-octyl phthalate and granulated to obtain polycarbonate granules;

[0049] (2) Using 5 wt.% ammonium bicarbonate as electrolyte, carbon fiber as anode, and graphite plate as cathode, the carbon fiber is surface oxidized using an electrochemical oxidation device. After the treatment, the carbon fiber is washed with deionized water multiple times to obtain oxidized carbon fiber;

[0050] (3) 1 g of oxidized carbon fiber was ultrasonically dispersed in distilled water in a rotary evaporation bottle, and then anhydrous ethanol and 140 g of propylene glycol were added. The mixture was vacuum-evaporated in a water bath at 95 ° C. After the distillation, the mixture was transferred to a round-bottom flask, and 60 g of thionyl chloride was added dropwise in a water bath at 4 ° C. After the addition was completed, the oil bath was heated to 60 ° C and reacted for 5 h. The product was rotary distilled in a water bath at 80 ° C, and then washed with distilled water several times to obtain polyhydroxylated carbon fiber.

[0051] (4) 2.5 g of ABS plastic was added to a flask and dissolved with 1,2-dichloroethane under a nitrogen atmosphere. After complete dissolution, 0.75 g of maleic acid and 0.05 g of dibenzoyl peroxide were added to the flask. The mixture was refluxed at 70 °C for 30 min, and then the reaction mixture was added to boiling distilled water with vigorous stirring. After 1 h, the mixture was filtered, washed twice with hot distilled water, and then vacuum dried to obtain maleic acid-modified ABS plastic.

[0052] (5) Dissolve 10 g of polyhydroxylated carbon fiber in N-methylpyrrolidone, add 1.2 g of catalyst pyridine hydrogen sulfate while stirring at 70 °C, continue stirring for 30 min, then add 15 g of maleic acid-modified ABS plastic and react for 10 h, then filter, wash, and dry at 60 °C to obtain carbon fiber modified ABS plastic;

[0053] (6) 14 g of polycarbonate was dried at 100 °C for 12 h, 6 g of carbon fiber modified ABS plastic and 2 g of maleic anhydride grafted ABS were dried at 75 °C for 8 h, and then the three were mixed, melt-extruded and granulated using a twin-screw extruder. After the pellets were dried at 100 °C for 14 h, standard specimens were made on an injection molding machine to obtain a composite material based on recycled polycarbonate and ABS.

[0054] Example 4

[0055] (1) After the recycled polycarbonate drinking water barrels were shredded and dried, the shredded materials were melt-extruded and granulated using a twin-screw extruder. 5 g of the obtained polycarbonate coarse granules were then kneaded with 0.7 g of ascorbic acid and 4 g of di-n-octyl phthalate and granulated to obtain polycarbonate granules;

[0056] (2) Using 6 wt.% ammonium bicarbonate as electrolyte, carbon fiber as anode, and graphite plate as cathode, the carbon fiber was surface oxidized using an electrochemical oxidation device. After the treatment, the carbon fiber was washed with deionized water several times to obtain oxidized carbon fiber;

[0057] (3) 0.5 g of oxidized carbon fiber was ultrasonically dispersed in distilled water in a rotary evaporation bottle, and then anhydrous ethanol and 115 g of propylene glycol were added. The mixture was vacuum-evaporated in a water bath at 85 ° C. After the distillation, the mixture was transferred to a round-bottom flask, and 40 g of thionyl chloride was added dropwise in a water bath at 0 ° C. After the addition was completed, the oil bath was heated to 40 ° C for 1 hour, and the mixture was rotary distilled in a water bath at 70 ° C. The product was then washed with distilled water several times to obtain polyhydroxylated carbon fiber.

[0058] (4) 2.5 g of ABS plastic was added to a flask and dissolved with 1,2-dichloroethane under a nitrogen atmosphere. After complete dissolution, 2 g of maleic acid and 0.3 g of dibenzoyl peroxide were added to the flask. The mixture was refluxed at 90 °C for 90 min, and then the reaction mixture was added to boiling distilled water with vigorous stirring. After 5 h, the mixture was filtered, washed with hot distilled water 4 times, and then vacuum dried to obtain maleic acid-modified ABS plastic.

[0059] (5) Dissolve 10 g of polyhydroxylated carbon fiber in N-methylpyrrolidone, add 0.8 g of catalyst pyridine hydrogen sulfate while stirring at 60 °C, continue stirring for 20 min, then add 13 g of maleic acid-modified ABS plastic and react for 8 h, then filter, wash, and dry at 50 °C to obtain carbon fiber modified ABS plastic;

[0060] (6) 13 g of polycarbonate was dried at 130 °C for 10 h, 7 g of carbon fiber modified ABS plastic and 1.2 g of styrene maleic anhydride copolymer were dried at 80 °C for 5 h, and then the three were mixed, melt-extruded and granulated using a twin-screw extruder. After the pellets were dried at 110 °C for 10 h, standard specimens were made on an injection molding machine to obtain a composite material based on recycled polycarbonate and ABS.

[0061] Example 5

[0062] (1) After the recycled polycarbonate drinking water barrels were shredded and dried, the shredded materials were melt-extruded and granulated using a twin-screw extruder. Then, 5 g of the obtained polycarbonate coarse granules were kneaded with 1.1 g of ascorbic acid and 7.5 g of di-n-octyl phthalate and granulated to obtain polycarbonate granules;

[0063] (2) Using 7 wt.% ammonium bicarbonate as electrolyte, carbon fiber as anode, and graphite plate as cathode, the carbon fiber is surface oxidized using an electrochemical oxidation device. After the treatment, the carbon fiber is washed with deionized water multiple times to obtain oxidized carbon fiber;

[0064] (3) 0.8 g of oxidized carbon fiber was ultrasonically dispersed in distilled water in a rotary evaporation bottle, and then anhydrous ethanol and 127 g of propylene glycol were added. The mixture was vacuum-evaporated in a water bath at 90 ° C. After the distillation, the mixture was transferred to a round-bottom flask, and 50 g of thionyl chloride was added dropwise in a water bath at 2 ° C. After the addition was completed, the oil bath was heated to 50 ° C and reacted for 5 h. The product was rotary distilled in a water bath at 70 ° C, and then washed with distilled water several times to obtain polyhydroxylated carbon fiber.

[0065] (4) 2.5 g of ABS plastic was added to a flask and dissolved with 1,2-dichloroethane under a nitrogen atmosphere. After complete dissolution, 0.75 g of maleic acid and 0.3 g of dibenzoyl peroxide were added to the flask. The mixture was refluxed at 70 °C for 90 min, and then the reaction mixture was added to boiling distilled water with vigorous stirring. After 1 h, the mixture was filtered, washed with hot distilled water 4 times, and then vacuum dried to obtain maleic acid-modified ABS plastic.

[0066] (5) 10 g of polyhydroxylated carbon fiber was dissolved in N-methylpyrrolidone, and 1.6 g of catalyst pyridine hydrogen sulfate was added while stirring at 80 °C. After stirring for 40 min, 18 g of maleic acid-modified ABS plastic was added and reacted for 12 h. The mixture was then filtered, washed, and dried at 70 °C to obtain carbon fiber-modified ABS plastic.

[0067] (6) 14 g of polycarbonate was dried at 100 °C for 16 h, 7 g of carbon fiber modified ABS plastic and 1.2 g of styrene maleic anhydride copolymer were dried at 80 °C for 10 h, and then the three were mixed, melt-extruded and granulated using a twin-screw extruder. After the pellets were dried at 100 °C for 12 h, standard specimens were made on an injection molding machine to obtain a composite material based on recycled polycarbonate and ABS.

[0068] Comparative Example 1

[0069] (1) After the recycled polycarbonate drinking water barrels were shredded and dried, the shredded materials were melt-extruded and granulated using a twin-screw extruder. 5 g of the obtained polycarbonate coarse granules were then kneaded with 0.7 g of ascorbic acid and 4 g of di-n-octyl phthalate and granulated to obtain polycarbonate granules;

[0070] (2) 14 g of polycarbonate was dried at 100 °C for 12 h, 6 g of ABS plastic and 2 g of styrene maleic anhydride copolymer were dried at 75 °C for 8 h, and then the three were mixed, melt-extruded and granulated using a twin-screw extruder. After the granules were dried at 100 °C for 14 h, standard samples were made on an injection molding machine to obtain a composite material.

[0071] The notched impact strength of the product was tested according to GB / T1843-2008; the tensile strength of the product was tested according to GB / T1040.2-2022; the flexural strength of the product was tested according to GB / T9341-2008; the melt flow rate of the product was tested according to GB / T3682.2-2018; the vertical flammability of the product was tested according to UL94 standard; the test specimens were placed in a constant temperature oven at 70°C for 168 hours, and then adjusted at 25°C and 50% humidity for 48 hours to test their vertical flammability.

[0072] The test results are shown in Table 1.

[0073] Table 1 Performance test results

[0074]

[0075] Due to the presence of benzene rings, conventional polycarbonate has high rigidity and steric hindrance, making it difficult to process and easily produce stress cracking. The mechanical properties of the recycled material after aging are even worse. As shown in Table 1, the notched impact strength of the products prepared in each embodiment is 640 J·m -1 The tensile strength is about 80-90 MPa, and the flexural strength is about 140-150 MPa, which are significantly higher than the data of the comparative example, indicating that the mechanical properties of the composite material are significantly improved after the carbon fiber-modified ABS plastic is blended with polycarbonate. The melt flow rate of the product prepared in the example is about 12 g / 10 min, which is lower than that of the comparative example product. This shows that the compatibilizer enhances the interaction between polycarbonate and ABS plastic. The addition of carbon fiber also increases frictional resistance, thereby reducing the melt flow rate. Without the addition of flame retardant, the products prepared in each example still exhibit a certain degree of flame retardancy, and after heat treatment, their flame retardancy is well maintained.

Claims

1. A method for preparing a composite material based on recycled polycarbonate and ABS, characterized in that: The preparation method is as follows: (1) After washing, drying and crushing the recovered polycarbonate products, the crushed materials are melt-extruded and granulated, and the obtained coarse polycarbonate particles are kneaded with ascorbic acid and di-n-octyl phthalate and granulated to obtain polycarbonate particles; (2) Using ammonium bicarbonate as electrolyte, the carbon fiber is surface oxidized using an electrochemical oxidation device to obtain oxidized carbon fiber; (3) Dispersing the oxidized carbon fibers in water, then adding ethanol and glycerol, and distilling under reduced pressure at 85-95°C. After the distillation is completed, adding thionyl chloride dropwise at 0-4°C, and reacting at 40-60°C for 1-5 hours. After the reaction is completed, distilling and washing to obtain polyhydroxylated carbon fibers; (4) Add ABS plastic to a flask and dissolve it with 1,2-dichloroethane under a nitrogen atmosphere. After complete dissolution, add maleic acid and dibenzoyl peroxide to the flask, condense and reflux at 70-90°C for 30-90 minutes, then add the reacted mixture to boiling distilled water with vigorous stirring. After 1-5 hours, filter, wash and dry to obtain maleic acid-modified ABS plastic; (5) Dissolve the polyhydroxylated carbon fiber in N-methylpyrrolidone, add pyridine bisulfate while stirring at 60-80°C, continue stirring for 20-40 minutes, then add maleic acid-modified ABS plastic and react for 8-12 hours, then filter, wash, and dry to obtain carbon fiber modified ABS plastic; (6) The polycarbonate particles, carbon fiber modified ABS plastic and compatibilizer are mixed, melt-extruded, granulated and dried to obtain the composite material.

2. The method for preparing a composite material based on recycled polycarbonate and ABS according to claim 1, characterized in that: In step (1), the mass ratio of the polycarbonate coarse particles, ascorbic acid and di-n-octyl phthalate is 10:(1.4-2.2):(8-13).

3. The method for preparing a composite material based on recycled polycarbonate and ABS according to claim 1, characterized in that: In step (3), the mass ratio of oxidized carbon fiber, propylene glycol and thionyl chloride is (1-2): (230-280): (80-120).

4. The method for preparing a composite material based on recycled polycarbonate and ABS according to claim 1, characterized in that: In step (4), the mass ratio of ABS plastic, maleic acid and dibenzoyl peroxide is 10:(3-8):(0.2-1.2).

5. The method for preparing a composite material based on recycled polycarbonate and ABS according to claim 1, characterized in that: In step (5), the mass ratio of the polyhydroxylated carbon fiber, the maleic acid-modified ABS plastic, and the pyridine bisulfate is 100:(130-180):(8-16).

6. The method for preparing a composite material based on recycled polycarbonate and ABS according to claim 1, characterized in that: In step (6), the mass ratio of polycarbonate, carbon fiber modified ABS plastic and compatibilizer is (65~75):(25~35):(6~12).

7. The method for preparing a composite material based on recycled polycarbonate and ABS according to claim 1, characterized in that: In step (6), the compatibilizer is selected from one of styrene maleic anhydride copolymer and maleic anhydride grafted ABS.

8. A composite material based on recycled polycarbonate and ABS prepared by the method according to any one of claims 1 to 7.

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