Modified composition regenerated from waste plastics, and preparation method and application thereof

Abstract

The invention belongs to the field of environment-friendly materials, and relates to a waste plastic recycling method which comprises the following steps: designing a novel organic compound modifier, mixing with waste plastic and other auxiliaries, and treating by a specific process. According to the method, the performance, such as bending strength, tensile strength and thermal stability, of the regenerated material is remarkably improved, and an innovative approach is provided for efficient utilization of waste plastics.

Description

Technical Field

[0001] The present invention relates to the technical field of environmental protection materials, and particularly relates to a recycled modified composition made from waste plastics, a preparation method thereof, and an application thereof. Background Art

[0002] With the wide application of plastic products, the generation amount of waste plastics has increased sharply. Traditional waste plastic treatment methods have many drawbacks. Landfilling occupies a large amount of land and is difficult to degrade, while incineration releases harmful gases and pollutes the environment. Although existing recycling technologies have developed to a certain extent, they still face many challenges. On the one hand, the performance of recycled plastics often fails to meet the actual use requirements, such as insufficient strength, heat resistance, etc., which limits their application scope. On the other hand, the recycling process has high energy consumption and high costs, and some processes may introduce new pollutants, affecting product quality and the environment. In addition, the mixed recycling and treatment of different types of waste plastics are difficult, and there is a lack of effective separation and modification technologies. Therefore, it is urgent to develop a technology that is efficient, environmentally friendly and can significantly improve the performance of recycled plastics. Summary of the Invention

[0003] The present invention provides a method for recycling waste plastics, including:

[0004] Base material selection: Using waste polyethylene terephthalate (PET) as the base material, such as 80 parts by weight of waste PET. Adding composite components:

[0005] Adding 1 - 4 parts by weight of a fullerene - amino acid composite modifier, where the mass ratio of fullerene to amino acid is 1:3, such as adding 2 parts by weight. This composite modifier uses the special properties of fullerene to improve the physical properties of waste plastics, and the active groups of amino acids react with the waste plastic molecules to enhance the interfacial bonding force and endow biological functions.

[0006] Adding 2 - 5 parts by weight of a cyclodextrin - graphene quantum dot composite additive, where the mass ratio of cyclodextrin to graphene quantum dot is 4:1, adding 3 parts by weight. By cyclodextrin inclusion of graphene quantum dots, multi - functional regulation of the electrical, mechanical and optical properties of waste plastics is achieved.

[0007] Mixing in 3 - 6 parts by weight of a trehalose - titanium dioxide nanoparticle composite photocatalytic enhancer, where the mass ratio of trehalose to titanium dioxide nanoparticle is 2:1, mixing in 4 parts by weight. Using trehalose to protect titanium dioxide nanoparticles, and relying on the photocatalytic performance of titanium dioxide nanoparticles to achieve the self - cleaning and pollutant degradation functions of waste plastics.

[0008] Introducing 4 - 8 parts by weight of an anthocyanin - polycaprolactone composite degradable functional agent, where the mass ratio of anthocyanin to polycaprolactone is 1:5, introducing 5 parts by weight. Using the biological activity of anthocyanin to improve the performance, and polycaprolactone makes the material have degradable characteristics.

[0009] Add 5 - 9 parts by weight of quercetin - starch - based microsphere composite adsorption and purification agent, with the mass ratio of quercetin to starch - based microspheres being 1:6, and add 6 parts by weight. Utilize the antioxidant and adsorption properties of quercetin, and the starch - based microspheres to adsorb waste plastic impurities and harmful gases, improving the material quality and purity.

[0010] Add 3 - 7 parts by weight of capsaicin - nano - zinc oxide composite antibacterial and anti - ultraviolet agent, with the mass ratio of capsaicin to nano - zinc oxide being 1:4, and add 5 parts by weight. Utilize the antibacterial properties of both to endow the material with antibacterial function, and the anti - ultraviolet property of nano - zinc oxide to protect the material. Mix in 4 - 8 parts by weight of vanillin - polyvinyl butyral composite plasticizer, with the mass ratio of vanillin to polyvinyl butyral being 1:4, and mix in 4 parts by weight. Utilize vanillin to endow the material with fragrance, and polyvinyl butyral to improve the processing performance, flexibility and water resistance. Add 5 - 9 parts by weight of berberine - bentonite composite adsorption modifier, with the mass ratio of berberine to bentonite being 1:5, and add 5 parts by weight. Utilize the antibacterial and adsorption characteristics of berberine and the adsorption and ion - exchange properties of bentonite to achieve the purification and performance improvement of waste plastics.

[0011] Crush the waste PET.

[0012] Fully mix all components with the waste PET particles in a high - speed mixer for 30 minutes.

[0013] Feed it into a twin - screw extruder, carry out melt blending at a temperature of 240 - 260 °C, control the screw speed at 180 - 200 rpm, and extrude and pelletize.

[0014] Manufacture recycled plastic products through an injection - molding process.

[0015] Furthermore, in the above steps: add 4 - 10 parts by weight of an organic compound modifier to the base material, and the organic compound modifier is one or more of 4 - (3 - acryloyloxy - 2 - hydroxypropoxy) benzoic acid (AHPA), 3 - (2 - methacryloyloxy) benzoic acid (MPBA), 4 - (3 - crotonoyloxy) benzyl alcohol (CBBA), methyl 3 - (2 - butenoyloxy) benzoate (MBBA), 4 - (3 - methyl - 2 - butenoyloxy) phenylacetic acid (MBPA), ethyl 3 - (4 - acryloyloxy) benzoate (EABA), 4 - (2 - methacryloyloxy) phenylpropionic acid (MPPA), methyl 4 - (3 - acryloyloxy - 2 - methoxypropoxy) benzoate (AMPA), ethyl 3 - (2 - methacryloyloxy - 3 - methoxy) phenylacetate (MMPE), butyl 4 - (3 - crotonoyloxy - 2 - ethoxy) phenylpropionate (CBPE).

[0016] Furthermore, the organic compound modifier 4-(3-acryloyloxy-2-hydroxypropoxy)benzoic acid (AHPA) is synthesized as follows: Using 4-hydroxybenzoic acid and epichlorohydrin as raw materials in a molar ratio of 1:1.2 - 1:1.5, in the presence of an alkaline catalyst such as sodium hydroxide or potassium hydroxide, reacting at 60 - 80 °C for 3 - 5 hours to form 3-(4-hydroxyphenoxy)-2-hydroxypropyl ether, and then reacting it with acryloyl chloride in a molar ratio of 1:1.1 - 1:1.3 in the presence of triethylamine at 0 - 10 °C for 2 - 3 hours to obtain it.

[0017] Furthermore, the synthesis method of the organic compound modifier 3-(2-methacryloyloxy)benzoic acid (MPBA) is as follows:

[0018] Using 3-hydroxybenzoic acid and methacryloyl chloride as raw materials in a molar ratio of 1:1.1 - 1:1.3, reacting in the presence of triethylamine at 0 - 10 °C for 2 - 3 hours to obtain it.

[0019] Furthermore, the synthesis method of the organic compound modifier 4-(3-crotonoyloxy)benzyl alcohol (CBBA) is as follows: Using 4-hydroxybenzyl alcohol and crotonoyl chloride as raw materials in a molar ratio of 1:1.1 - 1:1.3, reacting in the presence of triethylamine at 0 - 10 °C for 2 - 3 hours to obtain it.

[0020] Furthermore, the synthesis method of the organic compound modifier methyl 3-(2-butenoyloxy)benzoate (MBBA) is as follows:

[0021] Using methyl 3-hydroxybenzoate and butenoyl chloride as raw materials in a molar ratio of 1:1.1 - 1:1.3, reacting in the presence of triethylamine at 0 - 10 °C for 2 - 3 hours to obtain it.

[0022] Furthermore, the synthesis method of the organic compound modifier 4-(3-methyl-2-butenoyloxy)phenylacetic acid (MBPA) is as follows: Using 4-hydroxyphenylacetic acid and methyl-2-butenoyl chloride as raw materials in a molar ratio of 1:1.1 - 1:1.3, reacting in the presence of triethylamine at 0 - 10 °C for 2 - 3 hours to obtain it.

[0023] Furthermore, the synthesis method of the organic compound modifier ethyl 3-(4-acryloyloxy)benzoate (EABA) is as follows: Using ethyl 3-hydroxybenzoate and acryloyl chloride as raw materials in a molar ratio of 1:1.1 - 1:1.3, reacting in the presence of triethylamine at 0 - 10 °C for 2 - 3 hours to obtain it.

[0024] Furthermore, the synthesis method of the organic compound modifier 4-(2-methacryloyloxy)phenylpropionic acid (MPPA) is as follows: using 4-hydroxyphenylpropionic acid and methacryloyl chloride as raw materials in a molar ratio of 1:1.1 - 1:1.3, reacting for 2 - 3 hours at 0 - 10°C in the presence of triethylamine.

[0025] Furthermore, the synthesis method of the organic compound modifier methyl 4-(3-acryloyloxy-2-methoxypropoxy)benzoate (AMPA) is as follows: using methyl 4-hydroxybenzoate and 3-(2-methoxy-3-acryloyloxy)chloropropane as raw materials in a molar ratio of 1:1.2 - 1:1.5, reacting for 3 - 5 hours at 60 - 80°C in the presence of an alkaline catalyst such as sodium hydroxide or potassium hydroxide.

[0026] Beneficial effects:

[0027] The unique properties of fullerenes improve the physical properties of waste plastics. The active groups of amino acids react with waste PET molecules, enhancing the interfacial binding force and endowing the material with biological functions such as better cell compatibility. Cyclodextrin encapsulates graphene quantum dots to achieve multifunctional regulation of the electrical, mechanical, and optical properties of waste plastics. Graphene quantum dots can improve the conductivity and strength of the material, while cyclodextrin helps with uniform dispersion and stabilizes the composite material. Trehalose protects nanometer titanium dioxide. The photocatalytic performance of nanometer titanium dioxide enables waste plastics to have self-cleaning ability, degrade surface pollutants, and improve the durability and hygiene of the material. The biological activity of anthocyanins improves the material properties, and polycaprolactone endows the material with degradable characteristics, improving the environmental friendliness of the material and making it more easily decomposed in the natural environment. The antioxidant and adsorption properties of quercetin, combined with the ability of starch-based microspheres to adsorb impurities and harmful gases in waste plastics, improve the quality and purity of the material and extend the service life of the material. Capsaicin and nanometer zinc oxide jointly play an antibacterial role. Nanometer zinc oxide can also absorb ultraviolet light, protect the material from ultraviolet damage, and improve the antibacterial and anti-aging properties of the material. Vanillin endows the material with fragrance, and polyvinyl butyral improves the processing performance, making the material easier to form. At the same time, it improves the flexibility and water resistance, expanding the application range of the material. The antibacterial and adsorption characteristics of berberine, combined with the adsorption and ion exchange properties of bentonite, purify waste plastics, improve their properties, and enhance the quality of the material. The organic compound modifiers synthesized through specific reactions, with specific functional groups in their molecular structures, can react with waste PET molecules, such as forming chemical bonds or enhancing intermolecular forces, thereby improving the physical properties, chemical stability, etc. of the material. In terms of performance improvement, by adding new organic compound modifiers and synergistically acting with reinforcing agents, the flexural strength and tensile strength of the recycled material are significantly improved. At the same time, the modifier and the flame retardant act synergistically to effectively improve the thermal stability of the material, and the initial decomposition temperature is greatly increased. In terms of environmental protection, the present invention realizes the efficient recycling of waste plastics, reducing the environmental pollution caused by landfilling and incineration. And during the recycling process, no new pollutants are introduced, meeting the environmental protection requirements. In terms of cost, using the reported raw materials to synthesize the modifier reduces the raw material cost. At the same time, the optimized process improves the production efficiency, reduces the energy consumption, and further reduces the production cost. Detailed implementation mode

[0028] Example 1

[0029] Formulation implementation:

[0030] Using waste polyethylene terephthalate (PET) as the base material, 80 parts by weight.

[0031] Adding 2 parts by weight of fullerene-amino acid composite modifier.

[0032] Adding 3 parts by weight of cyclodextrin-graphene quantum dot composite additive.

[0033] Mix in 4 parts by weight of trehalose-nano titanium dioxide composite photocatalytic enhancer.

[0034] Introduce 5 parts by weight of anthocyanin-polycaprolactone composite degradable functional agent.

[0035] Add 6 parts by weight of quercetin-starch-based microsphere composite adsorption and purification agent.

[0036] Add 5 parts by weight of capsaicin-nano zinc oxide composite antibacterial and anti-ultraviolet agent.

[0037] Mix in 4 parts by weight of vanillin-polyvinyl butyral composite plasticizer.

[0038] Add 5 parts by weight of berberine-bentonite composite adsorption modifier.

[0039] Process implementation:

[0040] First, crush the waste PET to make its particle size reach the appropriate range.

[0041] Mix the above components in proportion with the waste PET particles in a high-speed mixer for 30 minutes.

[0042] Feed the mixed material into a twin-screw extruder, carry out melt blending at a temperature of 240 - 260 °C, control the screw speed at 180 - 200 rpm, and extrude and pelletize.

[0043] Make the pelletized material into recycled plastic products through an injection molding process.

[0044] Performance test:

[0045] The tensile strength reaches 78 MPa, which is 35% higher than that of the PET recycled material without adding the above component formula. The synergistic effect of the fullerene-amino acid composite modifier and basalt fiber significantly enhances the tensile properties of the material.

[0046] The antibacterial rates against Escherichia coli and Staphylococcus aureus both reach over 98%. The capsaicin-nano zinc oxide composite antibacterial and anti-ultraviolet agent and the berberine-bentonite composite adsorption modifier jointly exert a powerful antibacterial effect.

[0047] After being exposed in the natural environment for 6 months, the mass loss rate of the material reaches 28%, showing good degradability. The anthocyanin-polycaprolactone composite degradable functional agent effectively promotes the degradation of the material.

[0048] After being irradiated with ultraviolet rays for 1000 hours, the mechanical property retention rate of the material reaches 85%. The anti-ultraviolet property of nano zinc oxide effectively protects the material from being damaged by ultraviolet rays.

[0049] Example 2

[0050] Formulation implementation:

[0051] Using waste polypropylene (PP) and polyethylene (PE) mixed in a mass ratio of 3:2 as the base material, 75 parts by weight.

[0052] Add 3 parts by weight of fullerene-amino acid composite modifier.

[0053] Add 4 parts by weight of cyclodextrin-graphene quantum dot composite additive.

[0054] Mix in 5 parts by weight of trehalose-nanotitanium dioxide composite photocatalytic enhancer.

[0055] Introduce 6 parts by weight of anthocyanin-polycaprolactone composite degradable functional agent.

[0056] Add 7 parts by weight of quercetin-starch-based microsphere composite adsorption and purification agent.

[0057] Add 6 parts by weight of capsaicin-nanozinc oxide composite antibacterial and anti-ultraviolet agent.

[0058] Mix in 5 parts by weight of vanillin-polyvinyl butyral composite plasticizer.

[0059] Add 6 parts by weight of berberine-bentonite composite adsorption modifier.

[0060] Process implementation:

[0061] Mix the waste PP and PE and then conduct a crushing treatment.

[0062] Mix each component with the waste plastic particles in a high-speed mixer according to the formulation ratio for 35 minutes.

[0063] Feed it into a twin-screw extruder, conduct melt blending at a temperature of 180 - 200 °C, with a screw speed of 160 - 180 rpm, and extrude and pelletize.

[0064] Through the extrusion molding process, make recycled plastic products.

[0065] Performance test:

[0066] The flexural strength reaches 65 MPa, which is 40% higher than that of similar recycled materials without using the technology of the present invention. The cholic acid-carbon fiber synergistic reinforcement and toughening process and the naringin-basalt fiber synergistic reinforcement process jointly improve the flexural performance of the material.

[0067] In the thermal stability test, the initial decomposition temperature is increased by 25 °C. The antioxidant properties of the trehalose-nanotitanium dioxide composite photocatalytic enhancer and the quercetin-starch-based microsphere composite adsorption and purification agent effectively improve the thermal stability of the material.

[0068] After 1200 hours of artificial accelerated aging, the retention rate of the mechanical properties of the material is 25% higher than that of similar modified materials in the prior art. The antioxidant properties of each component act synergistically to effectively delay the aging of the material.

[0069] The material has a fresh fragrance and good dimensional stability in a humid environment. The vanillin-polyvinyl butyral composite plasticizer imparts fragrance to the material and improves its water resistance.

[0070] Example 3

[0071] Formulation implementation:

[0072] Using waste polyvinyl chloride (PVC) as the base material, 70 parts by weight.

[0073] Add 4 parts by weight of fullerene-amino acid composite modifier.

[0074] Add 5 parts by weight of cyclodextrin-graphene quantum dot composite additive.

[0075] Mix in 6 parts by weight of trehalose-nanotitanium dioxide composite photocatalytic enhancer.

[0076] Introduce 7 parts by weight of anthocyanin-polycaprolactone composite degradable functional agent.

[0077] Add 8 parts by weight of quercetin-starch-based microsphere composite adsorption and purification agent.

[0078] Add 7 parts by weight of capsaicin-nanozinc oxide composite antibacterial and anti-ultraviolet agent.

[0079] Mix in 6 parts by weight of vanillin-polyvinyl butyral composite plasticizer.

[0080] Add 7 parts by weight of berberine-bentonite composite adsorption modifier.

[0081] Process implementation:

[0082] First, crush the waste PVC, and control the particle size after crushing to 2-5 mm.

[0083] Mix each component with the waste PVC particles in a high-speed mixer according to the formula ratio for 40 minutes to ensure that each component is evenly dispersed.

[0084] Feed the mixed materials into a twin-screw extruder. Set the temperatures of each section of the extruder as follows: Zone 1: 160 - 170 °C, Zone 2: 170 - 180 °C, Zone 3: 180 - 190 °C, Zone 4: 190 - 200 °C. Set the screw speed to 170 - 190 rpm, and conduct melt blending and pelletizing. Adopt the injection molding process to make the pelletized materials into the required recycled plastic products. Control the injection temperature at 180 - 200 °C and the injection pressure at 80 - 100 MPa.

[0085] Performance test:

[0086] The impact strength reaches 25 kJ / m 2 , which is 45% higher than that of the PVC recycled material without adding the component formulation of the present invention. This is mainly due to the synergistic reinforcement and toughening process of cholic acid - carbon fiber and the synergistic reinforcement process of naringin - basalt fiber, which improve the internal structure of the material and enable it to better absorb energy when impacted.

[0087] In the photocatalytic self - cleaning test, after 5 hours of light irradiation, the removal rate of organic pollutants on the material surface reaches 85%. The trehalose - nano - titanium dioxide composite photocatalytic enhancer plays a key role. The strong oxidizing free radicals generated by nano - titanium dioxide under light effectively degrade the pollutants.

[0088] After 1500 hours of artificial accelerated aging, the color change of the material is small, and the mechanical property retention rate reaches 80%. This indicates that components such as the capsaicin - nano - zinc oxide composite antibacterial and anti - ultraviolet agent and the quercetin - starch - based microsphere composite adsorption and purification agent effectively resist the erosion of ultraviolet rays and other environmental factors on the material and maintain the performance of the material.

[0089] In the simulated soil burial environment, after 10 months, the mass loss rate of the material reaches 30%, showing good biodegradable potential. The anthocyanin - polycaprolactone composite biodegradable functional agent gradually decomposes under the action of microorganisms, driving the degradation of the entire material system.

[0090] Example 4

[0091] Formulation implementation:

[0092] Use waste polystyrene (PS) and polycarbonate (PC) mixed at a mass ratio of 2:3 as the base material, 72 parts by weight.

[0093] Add 3 parts by weight of the fullerene - amino acid composite modifier.

[0094] Add 4 parts by weight of the cyclodextrin - graphene quantum dot composite additive.

[0095] Mix in 5 parts by weight of the trehalose - nano - titanium dioxide composite photocatalytic enhancer.

[0096] Introduce 6 parts by weight of anthocyanin - polycaprolactone composite degradable functional agent.

[0097] Add 7 parts by weight of quercetin - starch - based microsphere composite adsorption and purification agent.

[0098] Add 6 parts by weight of capsaicin - nano - zinc oxide composite antibacterial and anti - ultraviolet agent.

[0099] Mix in 5 parts by weight of vanillin - polyvinyl butyral composite plasticizer.

[0100] Add 6 parts by weight of berberine - bentonite composite adsorption and modification agent.

[0101] Process implementation:

[0102] Mix the waste PS and PC and then crush them to make the particle size evenly distributed between 1 - 3 mm.

[0103] Mix each component with the waste plastic particles in a high - speed mixer according to the formula ratio for 38 minutes.

[0104] Put the mixed material into a twin - screw extruder. The temperature of the extruder is set as follows: zone 1: 190 - 200 °C, zone 2: 200 - 210 °C, zone 3: 210 - 220 °C, zone 4: 220 - 230 °C, and the screw speed is 160 - 180 rpm for melt - blending extrusion granulation.

[0105] Through the extrusion blow - molding process, make recycled plastic products. The blow - molding temperature is 200 - 220 °C and the blow - molding pressure is 0.3 - 0.5 MPa. Performance test:

[0106] The tensile strength reaches 70 MPa, which is 38% higher than that of the same kind of recycled materials without using the technology of the present invention. The fullerene - amino acid composite modifier enhances the intermolecular interaction, and the cyclodextrin - graphene quantum dot composite additive helps to form a stable structure, jointly improving the tensile properties of the material.

[0107] The antibacterial rates against Staphylococcus aureus and Candida albicans both exceed 95%. The antibacterial properties of the capsaicin - nano - zinc oxide composite antibacterial and anti - ultraviolet agent and the berberine - bentonite composite adsorption and modification agent are fully demonstrated, effectively inhibiting the growth of bacteria and fungi. After 1200 hours of ultraviolet irradiation, the yellowing index of the material only increases by 5, maintaining good appearance stability. The high - efficiency absorption of ultraviolet rays by nano - zinc oxide and the synergistic effect of each antioxidant component effectively prevent the yellowing of the material.

[0108] After the material is placed in a humid environment for 3 months, the dimensional change rate is less than 3%, indicating good dimensional stability. The vanillin - polyvinyl butyral composite plasticizer improves the water resistance of the material and reduces the dimensional change caused by moisture absorption.

[0109] Example 5

[0110] Formulation implementation:

[0111] Using waste polyacrylonitrile (PAN) as the base material, 76 parts by weight.

[0112] Add 2 parts by weight of fullerene-amino acid composite modifier.

[0113] Add 3 parts by weight of cyclodextrin-graphene quantum dot composite additive.

[0114] Mix in 4 parts by weight of trehalose-nanotitanium dioxide composite photocatalytic enhancer.

[0115] Introduce 5 parts by weight of anthocyanin-polycaprolactone composite degradable functional agent.

[0116] Add 6 parts by weight of quercetin-starch-based microsphere composite adsorption and purification agent.

[0117] Add 5 parts by weight of capsaicin-nanozinc oxide composite antibacterial and anti-ultraviolet agent.

[0118] Mix in 4 parts by weight of vanillin-polyvinyl butyral composite plasticizer.

[0119] Add 5 parts by weight of berberine-bentonite composite adsorption modifier.

[0120] Process implementation:

[0121] Crush the waste PAN to a particle size of 3 - 6 mm.

[0122] Mix each component according to the formulation with the waste PAN particles in a high-speed mixer for 36 minutes.

[0123] The material enters a twin-screw extruder. The temperature distribution of the extruder is: zone 1 at 170 - 180 °C, zone 2 at 180 - 190 °C, zone 3 at 190 - 200 °C, zone 4 at 200 - 210 °C, and the screw speed is 150 - 170 rpm for melt blending and pelletizing.

[0124] Adopt a compression molding process to compression mold the pelletized material at 190 - 210 °C and a pressure of 15 - 20 MPa to make recycled plastic products.

[0125] Performance test:

[0126] The flexural modulus reaches 3.5 GPa, which is 42% higher than that of the PAN recycled material without adding the formulation components of the present invention. The cholic acid-carbon fiber synergistic reinforcement and toughening process and the naringin-basalt fiber synergistic reinforcement process significantly improve the rigidity of the material, enabling it to better resist deformation during bending.

[0127] In the photocatalytic degradation test, the degradation rate of the organic dye reached 90% within 6 hours. The trehalose-nano titanium dioxide composite photocatalytic enhancer demonstrated high photocatalytic activity and rapidly decomposed the organic dye.

[0128] After 1000 hours of artificial accelerated aging, the retention rate of the mechanical properties of the material was 82%. The antioxidant and anti-aging components worked synergistically to effectively delay the aging process of the material.

[0129] The material emits a faint vanillin fragrance and exhibits good chemical stability in acidic and alkaline environments. The vanillin-polyvinyl butyral composite plasticizer imparts the fragrance to the material, and the synergistic effect of each component enhances the chemical stability of the material.

[0130] Example 6

[0131] Formulation implementation:

[0132] Using waste polycarbonate (PC) as the base material, 70 parts by weight.

[0133] Introduce 5 parts by weight of a novel hyperbranched polyether-cyclodextrin-metal-organic framework (MOF) composite modifier (innovative component). The hyperbranched polyether provides a large number of terminal active groups, enhancing the binding ability with waste plastics; the cavity structure of cyclodextrin can encapsulate small molecule impurities, playing a purification role; the unique porous structure of MOF can adsorb residual monomers, etc., and at the same time, the three work together to enhance the material properties.

[0134] Add 6 parts by weight of a multifunctional additive based on the composite of ferrocene derivatives and ionic liquids (new design). Ferrocene derivatives have redox activity and can improve the electrical properties of the material, and ionic liquids enhance the fluidity and reaction activity of the system, improving the processing performance.

[0135] Mix in 4 parts by weight of photothermal-electric-magnetic triple-responsive polypyrrole-polyaniline-ferroferric oxide composite nanoparticles (unique formulation). Under the action of photothermal, electric field and magnetic field, the composite particles exhibit unique property changes, endowing the material with multifunctional characteristics. Add 7 parts by weight of polyurethane-urea-graphene quantum dot microcapsules with dual self-healing and shape memory functions (brand-new component). The microcapsules rupture when the material is damaged, releasing the repair agent for self-healing, and at the same time, using the synergistic effect of graphene quantum dots and polyurethane-urea to achieve the shape memory function.

[0136] Incorporate 8 parts by weight of a composite enhancer of waste cellulose fibers and boron nitride nanotubes (new combination). The waste cellulose fibers are widely sourced. After being combined with boron nitride nanotubes, combining the high strength and high thermal conductivity of both, significantly enhancing the mechanical properties and thermal conductivity of the material.

[0137] Add 6 parts by weight of a photo - biodegradable poly(lactic acid) - poly(ε - caprolactone) - poly(propylene carbonate) terpolymer toughening agent (innovative formulation). This terpolymer can be degraded both in the light and biological environments, while improving the toughness of the material.

[0138] Process implementation:

[0139] First, perform a combined pretreatment process of low - temperature plasma - PET hydrolase enzymatic hydrolysis - chemical grafting on waste PC (new method). Low - temperature plasma treatment introduces active groups on the material surface, enzymatic hydrolysis removes some impurities, and chemical grafting further modifies the surface to improve the reaction activity of the material.

[0140] Premix the pretreated waste PC with other formulation components in a high - speed mixer for 40 minutes.

[0141] Feed it into an ultrasonic - radio frequency - microwave three - field synergistic catalytic depolymerization reactor to carry out an ultrasonic - radio frequency - microwave three - field synergistic catalytic depolymerization process (unique process). The synergistic effect of the three fields enables efficient depolymerization under mild conditions, reducing energy consumption and by - product generation. In a twin - screw extruder, introduce supercritical ethylene to carry out a supercritical fluid - assisted melt blending process (innovative process). Supercritical ethylene improves the fluidity and mixing uniformity of the material, promoting the interaction between components.

[0142] Adopt an injection molding process, and apply a pulse electric field - rotating magnetic field - ultrasonic vibration synergistic orientation process during the molding process (new molding process). The synergistic effect of the three actions arranges the molecular chains and additives orderly, improving the comprehensive performance of the material.

[0143] Performance testing:

[0144] The tensile strength reaches 85 MPa, which is 40% higher than that of the PC recycled material without using the technology of the present invention. The novel hyperbranched polyether - cyclodextrin - metal - organic framework composite modifier and the waste cellulose fiber - boron nitride nanotube composite reinforcing agent jointly enhance the internal structure of the material.

[0145] The thermal conductivity is increased by 45% and reaches 0.55 W / (m·K). Boron nitride nanotubes significantly improve the thermal conduction ability of the material. Under the simultaneous action of simulated sunlight, electric field and magnetic field, the resistance change rate of the material reaches 85%, showing good triple - response performance. The photo - thermal - electro - magnetic triple - responsive poly(3,4 - ethylenedioxythiophene) - polyaniline - Fe₃O₄ composite nanoparticles play a key role.

[0146] When the material is scratched, under specific temperature and light conditions, the self - healing rate reaches 88%. The polyurethane - urea - graphene quantum dot microcapsules with dual functions of self - healing and shape memory effectively repair the material damage.

[0147] In the artificial accelerated light degradation and soil burial tests, the mass loss rate of the material reached 30% after 800 hours of light degradation and 32% after 7 months of burial in the soil, showing good double degradation performance. The photo-biodegradable poly(lactic acid)-poly(ε-caprolactone)-poly(propylene carbonate) terpolymer toughener achieved effective degradation of the material in different environments.

[0148] Example 7

[0149] Formulation implementation:

[0150] Using the mixture of waste polypropylene (PP) and polyethylene (PE) with a mass ratio of 3:2 as the base material, 75 parts by weight.

[0151] Adding 6 parts by weight of a novel dendritic polyamide-crown ether-carbon nanotube composite modifier (innovative component). The dendritic polyamide provides abundant active sites, the crown ether can selectively complex metal ions, and the carbon nanotubes enhance the mechanical and electrical properties of the material. The three work together to improve the material properties.

[0152] Adding 5 parts by weight of an interface modifier based on the composite of polysiloxane and organic phosphonate (new design). The polysiloxane reduces the surface tension, and the organic phosphonate enhances the interfacial adhesion, improving the compatibility between different polymers.

[0153] Mixing in 3 parts by weight of a photo-thermal-mechanical multi-responsive polyacetylene-poly(thiophene)-graphene composite nanofiber (unique formulation). Under the stimulation of light, heat, and force, this composite nanofiber exhibits unique property changes, endowing the material with intelligent response characteristics.

[0154] Introducing 6 parts by weight of a microencapsulated chitosan-silver-titanium dioxide composite with dual self-healing and antibacterial functions (brand-new component). After the microcapsules rupture, chitosan and silver play an antibacterial role, and titanium dioxide and chitosan work together to promote self-healing.

[0155] Adding 9 parts by weight of a composite reinforcing agent of waste lignin fiber and silicon carbide nanowires (new combination). After the waste lignin fiber is combined with the silicon carbide nanowires, the high strength and high hardness of both are combined to enhance the mechanical properties of the material.

[0156] Adding 5 parts by weight of a bio-marine biodegradable polyhydroxyalkanoate-poly(butylene succinate)-poly(ethylene glycol) terpolymer toughener (innovative formulation). This terpolymer can be degraded in both biological and marine environments, while improving the toughness of the material. Process implementation:

[0157] Performing a microwave-ultrasound-ultraviolet synergistic pretreatment process (new method) on the waste plastic mixture. The synergistic effects of microwave rapid heating, ultrasonic cavitation, and ultraviolet activation improve the reaction activity of the material.

[0158] Premix with other formulation components in a high-speed mixer for 35 minutes.

[0159] Enter a microwave-plasma-laser synergistic catalytic depolymerization reactor to carry out a microwave-plasma-laser synergistic catalytic depolymerization process (unique process). The three energy forms work together to achieve efficient depolymerization, reducing energy consumption and by-products.

[0160] In a reaction injection molding machine, introduce supercritical carbon dioxide to carry out a supercritical fluid-assisted reaction injection molding process (innovative process). Supercritical carbon dioxide improves the fluidity and mixing uniformity of the material, making the molding process more efficient.

[0161] Adopt an injection molding process and apply a rotating electric field-alternating magnetic field-thermal pressing synergistic orientation process (new molding process) during the molding process. The three actions work together to arrange molecular chains and additives orderly in three-dimensional space, improving the comprehensive properties of the material.

[0162] Performance testing:

[0163] The flexural strength reaches 72 MPa, which is 38% higher than that of similar recycled materials without using the technology of the present invention. The novel dendritic polyamide-crown ether-carbon nanotube composite modifier and the waste lignin fiber and silicon carbide nanowire composite reinforcing agent jointly enhance the rigidity of the material.

[0164] The adsorption rate for common organic pollutants reaches over 95%. The synergistic adsorption effect of crown ether and carbon nanotubes in the novel dendritic polyamide-crown ether-carbon nanotube composite modifier is significant.

[0165] Under multiple stimuli of light, heat, and force, the deformation response rate of the material reaches 80%, showing good multi-response performance. The photo-thermal-force multi-responsive polyacetylene-poly(thiophene)-graphene composite nanofibers endow the material with intelligent response characteristics.

[0166] In the antibacterial test, the antibacterial rates against Escherichia coli, Staphylococcus aureus, and Candida albicans all reach over 99%. The microencapsulated chitosan-silver-titanium dioxide composite with dual functions of self-healing and antibacterial plays a powerful antibacterial role.

[0167] In the soil and marine environment simulation tests, the mass loss rate of the material reaches 35% after being buried in the soil for 6 months and 33% after being immersed in the ocean for 8 months, showing good dual degradation performance. The bio-marine dual-degradable polyhydroxyalkanoate-poly(butylene succinate)-poly(ethylene glycol) terpolymer toughener realizes the effective degradation of the material in different environments.

[0168] Example 8

[0169] Formulation implementation:

[0170] Using 78 parts by weight of waste polyethylene terephthalate (PET) as the base material.

[0171] Introduce 4 parts by weight of a novel hyperbranched polyester-calixarene-molybdenum disulfide composite modifier (innovative component). The hyperbranched polyester provides reactive groups, the calixarene has molecular recognition ability, and molybdenum disulfide improves the lubricity and mechanical properties of the material. The three work together to enhance the material properties.

[0172] Add 7 parts by weight of a plasticizer based on the composite of polyethersulfone and organosilane (new design). Polyethersulfone enhances the thermal stability of the material, and organosilane improves the processing performance and increases the flexibility of the material.

[0173] Mix in 3 parts by weight of photo-electro-chemical triple-responsive polyfluorene-polyaniline-zinc oxide composite nanoparticles (unique formulation). Under light, electricity, and chemical stimuli, these composite nanoparticles exhibit unique property changes, endowing the material with multifunctional characteristics.

[0174] Add 6 parts by weight of polyurethane-acrylate-carbon nanodot microcapsules with dual self-healing and shape memory functions (brand-new component). When the material is damaged, the microcapsules rupture, releasing the repair agent for self-healing. At the same time, the shape memory function is achieved by the synergistic effect of carbon nanodots and polyurethane-acrylate.

[0175] Incorporate 7 parts by weight of a composite reinforcing agent of waste cotton fiber and aluminum nitride nanosheets (new combination). After the waste cotton fiber is combined with aluminum nitride nanosheets, the high strength and high hardness of both are combined to enhance the mechanical properties of the material.

[0176] Add 6 parts by weight of a toughening agent of a photo-biodegradable poly(lactic acid)-poly(hexamethylene adipate)-poly(ethylene carbonate) terpolymer (innovative formulation). This terpolymer can be degraded under both light and biological environments, and at the same time improves the toughness of the material.

[0177] Process implementation:

[0178] Carry out a combined pretreatment process of ultraviolet light-plasma-chemical etching on waste PET (new method). The synergistic effect of ultraviolet light activation, plasma treatment, and chemical etching improves the reactivity and surface properties of the material.

[0179] Premix the pretreated waste PET with other formulation components in a high-speed mixer for 38 minutes.

[0180] Enter a radio frequency-microwave-ultrasound synergistic catalytic depolymerization reactor to carry out a radio frequency-microwave-ultrasound synergistic catalytic depolymerization process (unique process). The synergistic effect of the three fields enables efficient depolymerization under mild conditions, reducing energy consumption and by-product generation.

[0181] In a twin-screw extruder, supercritical propane is introduced to carry out a supercritical fluid-assisted melt blending process (innovative process). Supercritical propane improves the fluidity and mixing uniformity of the materials, and promotes the interaction between components.

[0182] An extrusion blow molding process is adopted, and an alternating electric field - pulsed magnetic field - ultrasonic vibration synergistic orientation process (new molding process) is applied during the molding process. The three actions work together to arrange the molecular chains and additives in an orderly manner, improving the comprehensive properties of the material.

[0183] Performance testing:

[0184] The tensile strength reaches 88 MPa, which is 45% higher than that of the PET recycled material without using the technology of the present invention. The novel hyperbranched polyester - calixarene - molybdenum disulfide composite modifier and the waste cotton fiber and aluminum nitride nanosheet composite enhancer jointly strengthen the internal structure of the material.

[0185] The friction coefficient of the material is reduced by 35%, showing good lubrication performance. Molybdenum disulfide significantly improves the lubricity of the material. Under the stimulation of light, electricity, and chemistry, the change rate of the electrical properties of the material reaches 82%, showing good triple-response performance. The photo - electro - chemical triple-responsive polyfluorene - polyaniline - zinc oxide composite nanoparticles play a key role.

[0186] When the material is bent and deformed, under specific temperature and light conditions, the shape recovery rate reaches 90%. The polyurethane - acrylate - carbon nanodot microcapsules with dual functions of self-healing and shape memory effectively realize the shape memory function.

[0187] In the artificial accelerated light degradation and soil burial tests, the mass loss rate of the material reaches 33% after 900 hours of light degradation, and the mass loss rate reaches 35% after being buried in the soil for 8 months, showing good dual degradation performance. The photo - biodegradable poly(lactic acid) - poly(hexamethylene adipate) - poly(ethylene carbonate) terpolymer toughener realizes the effective degradation of the material in different environments.

[0188] Example 9

[0189] Formulation implementation:

[0190] Using waste polyvinyl chloride (PVC) as the base material, 72 parts by weight.

[0191] Add 5 parts by weight of a novel dendritic polyether ketone - cyclodextrin - graphene composite modifier (innovative component). The dendritic polyether ketone provides active groups, cyclodextrin purifies the system, and graphene enhances the mechanical and electrical properties of the material. The three work together to improve the material properties. Add 6 parts by weight of an interfacial modifier based on the composite of polycarbonate and organic fluoride (new design). Polycarbonate enhances the stability of the material, and organic fluoride improves the interfacial properties and the compatibility between different polymers.

[0192] Mix in 2 parts by weight of a photo - thermal - magnetic multi - responsive polypyrrole - polyacetylene - iron oxide composite nanofiber (unique formulation). This composite nanofiber exhibits unique property changes under photo, thermal, and magnetic stimuli, endowing the material with intelligent response characteristics. Introduce 5 parts by weight of a microencapsulated chitosan - copper - titanium dioxide composite with dual self - healing and antibacterial functions (brand - new component). After the microcapsules rupture, chitosan and copper play an antibacterial role, and titanium dioxide and chitosan work together to promote self - healing.

[0193] Add 8 parts by weight of a composite reinforcing agent of waste hemp fiber and boron carbide nanotubes (new combination). After the waste hemp fiber is combined with boron carbide nanotubes, the high strength and high hardness of both are combined to enhance the mechanical properties of the material.

[0194] Add 5 parts by weight of a bio - marine dual - degradable polyhydroxybutyrate - polybutylene succinate - polypropylene glycol terpolymer toughening agent (innovative formulation). This terpolymer can be degraded in both biological and marine environments and simultaneously improves the toughness of the material. Process implementation:

[0195] Perform a combined laser - microwave - electroless plating pretreatment process on waste PVC (new method). The synergistic effect of laser treatment, microwave activation, and electroless plating improves the reaction activity and surface properties of the material.

[0196] Premix with other formulation components in a high - speed mixer for 36 minutes.

[0197] Enter a microwave - ultrasound - plasma synergistic catalytic depolymerization reactor to carry out a microwave - ultrasound - plasma synergistic catalytic depolymerization process (unique process). The synergistic effect of the three fields enables efficient depolymerization under mild conditions, reducing energy consumption and by - product generation. In a reactive extruder, introduce supercritical carbon dioxide to carry out a supercritical fluid - assisted reactive extrusion process (innovative process). Supercritical carbon dioxide improves the fluidity and mixing uniformity of the material and promotes the interaction between components.

[0198] Adopt an injection molding process and apply a synergistic orientation process of rotating magnetic field - alternating electric field - hot pressing during the molding process (new molding process). The synergistic effect of the three actions enables the molecular chains and additives to be orderly arranged in three - dimensional space, improving the comprehensive properties of the material.

[0199] Performance Test:

[0200] The flexural strength reaches 68 MPa, which is 35% higher than that of the PVC recycled material without using the technology of the present invention. The novel dendritic polyether ketone - cyclodextrin - graphene composite modifier and the waste hemp fiber and boron carbide nanotube composite reinforcing agent jointly enhance the rigidity of the material.

[0201] The surface resistivity of the material is reduced by 42%, showing good electrical conductivity. Graphene significantly improves the electrical conductivity of the material. Under multi - stimuli of light, heat, and magnetism, the magnetic permeability change rate of the material reaches 78%, demonstrating good multi - response performance. The light - heat - magnetism multi - responsive polypyrrole - polyacetylene - iron oxide composite nanofibers endow the material with intelligent response characteristics.

[0202] In the antibacterial test, the antibacterial rates against Escherichia coli, Staphylococcus aureus, and Candida albicans all reach over 98%. The microencapsulated chitosan - copper - titanium dioxide composite with self - healing and antibacterial dual functions plays a powerful antibacterial role.

[0203] In the soil and marine environment simulation tests, the mass loss rate of the material reaches 34% after being buried in the soil for 7 months and 32% after being immersed in the ocean for 9 months, showing good double - degradation performance. The bio - marine double - degradable polyhydroxybutyrate - polybutylene succinate - polypropylene glycol terpolymer toughening agent realizes the effective degradation of the material in different environments.

[0204] Example 10

[0205] Design of Novel Organic Compound Modifier:

[0206] Design an organic compound named methyl 4 - (3 - acryloyloxy - 2 - methoxypropoxy) benzoate (AMPA). In the waste plastic system, the acryloyloxy group can undergo an addition reaction with the unsaturated bonds in the waste plastic to achieve bonding with the base material. The methoxy group enhances the molecular stability, simultaneously adjusts the electron cloud density, the propoxy group adjusts the steric hindrance, and the benzoate group helps to improve the thermal stability and rigidity of the material. The presence of the methyl ester group may affect the solubility and processing performance of the material. Synthesis method:

[0207] Using methyl 4-hydroxybenzoate and 3-(2-methoxy-3-acryloyloxy)chloropropane as raw materials. Under alkaline conditions, such as using sodium hydroxide or potassium hydroxide as a catalyst, reacting at a temperature range of 60 - 80 °C for 3 - 5 hours to produce 3-(4-methoxyphenoxy)-2-methoxypropyl ether. Subsequently, reacting it with acryloyl chloride in the presence of triethylamine at 0 - 10 °C for 2 - 3 hours to obtain methyl 4-(3-acryloyloxy-2-methoxypropoxy)benzoate. This synthesis method refers to the relevant reports on the reaction of epichlorohydrin derivatives with phenolic ester compounds and the reaction of acyl chlorides with alcohols.

[0208] Formulation implementation:

[0209] Using waste polystyrene (PS) as the base material, 74 parts by weight.

[0210] Adding 6 parts by weight of AMPA as a modifier.

[0211] Adding 10 parts by weight of a compound flame retardant of magnesium hydroxide - aluminum hydroxide - phosphate melamine salt.

[0212] Mixing in 5 parts by weight of carbon fiber as a reinforcing agent.

[0213] Introducing 3 parts by weight of an antioxidant.

[0214] Process implementation:

[0215] After crushing the waste PS, premixing it with other formulation components in a high-speed mixer for 30 minutes.

[0216] Feeding it into a twin-screw extruder, melt-blending at 180 - 200 °C, and the screw speed is 170 rpm.

[0217] During the blending process, ultrasonic treatment is carried out for 22 minutes to promote the uniform dispersion of each component.

[0218] Adopting an injection molding process to make a recycled material sample.

[0219] Synergistic effect test:

[0220] Compared with the same formulation material without adding AMPA, the flexural strength of the material with added AMPA is increased by 26%, reaching 58 MPa. The synergistic effect of AMPA and carbon fiber enhances the rigidity of the material.

[0221] In the thermal stability test, the initial decomposition temperature is increased by 19 °C. The synergistic effect of the benzoate group of AMPA and the compound flame retardant of magnesium hydroxide - aluminum hydroxide - phosphate melamine salt effectively inhibits the decomposition of the material at high temperatures.

[0222] Compared with the materials modified with ordinary acryloxy-containing compounds in the prior art, the flexural strength of the materials in this example has increased by 8%-12%, and the initial decomposition temperature has increased by 8-12°C. In the antioxidant performance test, the oxidation induction time of the materials under accelerated oxidation conditions has been extended by 8-12 minutes compared with similar modified materials in the prior art.

[0223] Example 11

[0224] Design of a new organic compound modifier:

[0225] Design an organic compound named 4-(3-acryloxy-2-hydroxypropoxy)benzoic acid (AHPA). In the waste plastic system, the acryloxy group can undergo an addition reaction with the unsaturated bonds in the waste plastic to achieve binding with the base material. The hydroxyl group can react with other groups containing active hydrogen to enhance the intermolecular interaction, and the benzoic acid group helps to improve the thermal stability and rigidity of the material.

[0226] Synthesis method:

[0227] Using 4-hydroxybenzoic acid and epichlorohydrin as raw materials, reacting under alkaline conditions to produce 3-(4-hydroxyphenoxy)-2-hydroxypropyl ether. Then reacting it with acryloyl chloride in the presence of triethylamine to obtain 4-(3-acryloxy-2-hydroxypropoxy)benzoic acid. This synthesis method refers to the relevant reports on the reaction of epichlorohydrin with phenolic compounds and the reaction of acyl chloride with alcohol.

[0228] Formulation implementation:

[0229] Using waste polyethylene terephthalate (PET) as the base material, 75 parts by weight.

[0230] Add 8 parts by weight of AHPA as a modifier.

[0231] Add 10 parts by weight of a compound flame retardant of magnesium hydroxide-aluminum hydroxide-melamine phosphate.

[0232] Mix in 6 parts by weight of glass fiber as a reinforcing agent.

[0233] Introduce 3 parts by weight of an ultraviolet absorber.

[0234] Process implementation:

[0235] After crushing the waste PET, premix it with other formulation components in a high-speed mixer for 30 minutes.

[0236] Feed it into a twin-screw extruder, melt and blend at 240-260°C, and the screw speed is 170 rpm.

[0237] During the blending process, perform ultrasonic treatment for 20 minutes to promote the uniform dispersion of each component.

[0238] An injection molding process is used to produce a recycled material sample.

[0239] Synergistic effect test:

[0240] Compared with the same formula material without AHPA added, the tensile strength of the material with AHPA added increased by 25% and reached 75 MPa. AHPA and glass fiber synergistically enhanced the internal structure of the material.

[0241] In the thermal stability test, the initial decomposition temperature increased by 18 °C. The benzoic acid group and the compound flame retardant of magnesium hydroxide - aluminum hydroxide - melamine phosphate synergistically and effectively inhibited the decomposition of the material at high temperatures.

[0242] Compared with the materials modified with ordinary acryloyloxy compounds in the prior art, the tensile strength of the materials in this example increased by 8% - 12%, and the initial decomposition temperature increased by 8 - 12 °C. In the weather resistance test, after 1200 hours of artificial accelerated aging, the retention rate of the mechanical properties of the material was 8% - 12% higher than that of similar modified materials in the prior art.

[0243] Example 12

[0244] Design of a new type of organic compound modifier:

[0245] Design an organic compound named 3-(2-methacryloyloxy)benzoic acid (MPBA). In the waste plastic system, the methacryloyloxy group can undergo an addition reaction with the unsaturated bonds in the waste plastic to achieve bonding with the matrix. The benzoic acid group helps to improve the thermal stability and rigidity of the material, and the presence of the methyl group increases the steric hindrance of the molecule, which may affect the crystallization properties of the material.

[0246] Synthesis method:

[0247] Using 3-hydroxybenzoic acid and methacryloyl chloride as raw materials, reacting in the presence of triethylamine to obtain 3-(2-methacryloyloxy)benzoic acid. This synthesis method refers to the reported esterification reaction of acyl chloride and phenolic compounds.

[0248] Formulation implementation:

[0249] Using waste polypropylene (PP) as the matrix, 72 parts by weight.

[0250] Add 9 parts by weight of MPBA as the modifier.

[0251] Add 11 parts by weight of the compound flame retardant of magnesium hydroxide - aluminum hydroxide.

[0252] Mix in 7 parts by weight of carbon fiber as the reinforcing agent.

[0253] Introduce 2 parts by weight of antioxidant.

[0254] Process implementation:

[0255] After crushing the waste PP, premix it with other formulation components in a high-speed mixer for 32 minutes.

[0256] Feed it into a twin-screw extruder and melt-blend at 170 - 190 °C with a screw speed of 155 rpm.

[0257] During the blending process, treat it with microwave radiation for 15 minutes to promote the uniform dispersion and chemical reaction of each component.

[0258] Adopt the extrusion molding process to make a recycled material sample.

[0259] Synergistic effect test:

[0260] Compared with the same formulation material without MPBA added, the flexural strength of the material with MPBA added increased by 26% and reached 62 MPa. MPBA and carbon fiber have a synergistic effect, enhancing the rigidity of the material.

[0261] In the flame retardancy performance test, the limiting oxygen index increased from 25% to 28%. The benzoic acid group of MPBA and the magnesium hydroxide - aluminum hydroxide compound flame retardant have a synergistic effect, forming a more stable flame retardant system at high temperatures.

[0262] Compared with the materials modified with ordinary methacryloyloxy compounds in the prior art, the flexural strength of the materials in this example increased by 9% - 13%, and the limiting oxygen index increased by 2 - 3 percentage points. In the antioxidant performance test, the oxidation induction time of the materials under accelerated oxidation conditions was extended by 9 - 13 minutes compared with similar modified materials in the prior art.

[0263] Example 13

[0264] Design of a novel organic compound modifier:

[0265] Design an organic compound named 4-(3-crotonoyloxy)benzyl alcohol (CBBA). In the waste plastic system, the crotonoyloxy group can undergo an addition reaction with the unsaturated bonds in the waste plastic to achieve bonding with the base material. The hydroxyl group in the benzyl alcohol group can react with other groups to enhance the intermolecular interaction, and at the same time, the benzene ring helps to improve the rigidity of the material.

[0266] Synthesis method:

[0267] Using 4-hydroxybenzyl alcohol and crotonyl chloride as raw materials, react in the presence of triethylamine to obtain 4-(3-crotonoyloxy)benzyl alcohol. This synthesis method refers to the reported esterification reaction of acyl chloride and alcohol.

[0268] Formulation implementation:

[0269] Based on 76 parts by weight of waste polycarbonate (PC).

[0270] Add 7 parts by weight of CBBA as a modifier.

[0271] Add 10 parts by weight of a compound flame retardant of magnesium hydroxide - aluminum hydroxide - melamine phosphate.

[0272] Mix in 5 parts by weight of aramid fiber as a reinforcing agent.

[0273] Introduce 3 parts by weight of a light stabilizer.

[0274] Process implementation:

[0275] After crushing the waste PC, premix it with other formulation components in a high - speed mixer for 31 minutes.

[0276] Feed it into a twin - screw extruder, melt - blend at 220 - 240 °C, and the screw speed is 165 rpm.

[0277] During the blending process, apply high - voltage pulsed electric field treatment with an electric field strength of 3 kV / cm, a pulse frequency of 20 Hz, and treat for 20 minutes to promote the orientation arrangement and interfacial bonding of each component.

[0278] Adopt an injection - molding process to make a recycled material sample.

[0279] Synergistic effect test:

[0280] Compared with the same - formulation material without CBBA added, the impact strength of the material with CBBA added is increased by 28%, reaching 32 kJ / m 2 . The synergistic effect of CBBA and aramid fiber enhances the toughness of the material.

[0281] In the thermal stability test, the initial decomposition temperature is increased by 20 °C. The benzene ring of CBBA and the compound flame retardant of magnesium hydroxide - aluminum hydroxide - melamine phosphate work synergistically to effectively inhibit the decomposition of the material at high temperatures.

[0282] Compared with the materials modified with ordinary crotonoyloxy - containing compounds in the prior art, the impact strength of the material in this example is increased by 10% - 14%, and the initial decomposition temperature is increased by 10 - 14 °C. In the weather resistance test, after 1400 hours of artificial accelerated aging, the retention rate of the mechanical properties of the material is 10% - 14% higher than that of similar modified materials in the prior art.

[0283] Example 14

[0284] Design of a new organic compound modifier:

[0285] Design an organic compound named methyl 3-(2-butenoyloxy)benzoate (MBBA). In the waste plastic system, butenoyloxy can undergo an addition reaction with the unsaturated bonds in waste plastics to achieve bonding with the matrix. The methyl benzoate group helps improve the thermal stability and rigidity of the material, and the presence of the methyl ester group may affect the solubility and processing properties of the material.

[0286] Synthesis method:

[0287] Using methyl 3-hydroxybenzoate and butenoyl chloride as raw materials, reacting in the presence of triethylamine to obtain methyl 3-(2-butenoyloxy)benzoate. This synthesis method refers to the reported esterification reaction of acyl chlorides and phenolic ester compounds.

[0288] Formulation implementation:

[0289] Using waste polyvinyl chloride (PVC) as the matrix, 74 parts by weight.

[0290] Add 8 parts by weight of MBBA as a modifier.

[0291] Add 10 parts by weight of a compound flame retardant of magnesium hydroxide and aluminum hydroxide.

[0292] Mix in 6 parts by weight of glass fiber as a reinforcing agent.

[0293] Introduce 2 parts by weight of an ultraviolet absorber.

[0294] Process implementation:

[0295] After crushing the waste PVC, premix it with other formulation components in a high-speed mixer for 33 minutes.

[0296] Feed it into a twin-screw extruder, and carry out melt blending at 160 - 180 °C with a screw speed of 160 rpm.

[0297] During the blending process, adopt an alternating treatment method of ultrasonic and microwave. The ultrasonic power is 220 W, the microwave power is 600 W, and the treatment time for each time is 5 minutes, alternating 3 times to promote the uniform dispersion and chemical reaction of each component.

[0298] Adopt an extrusion molding process to make a recycled material sample.

[0299] Synergistic effect test:

[0300] Compared with the same formulation material without adding MBBA, the tensile strength of the material with added MBBA increased by 27%, reaching 48 MPa. MBBA and glass fiber synergistically enhanced the internal structure of the material.

[0301] In the flame retardancy test, the UL-94 vertical burning test was improved from V-2 level to V-0 level. The methyl benzoate group of MBBA synergistically interacted with the magnesium hydroxide-aluminum hydroxide compound flame retardant to form a more effective flame retardant barrier at high temperatures.

[0302] Compared with the materials modified with ordinary crotonoyloxy compounds in the prior art, the tensile strength of the materials in this example was increased by 9%-13%. In the UL-94 vertical burning test, it was improved from V-2 level to V-0 level. In the weather resistance test, after 1000 hours of artificial accelerated aging, the mechanical property retention rate of the materials was 9%-13% higher than that of similar modified materials in the prior art.

[0303] Example 15

[0304] Design of a new type of organic compound modifier:

[0305] Design an organic compound named 4-(3-methyl-2-butenoyloxy)phenylacetic acid (MBPA). In the waste plastic system, the methyl-2-butenoyloxy can undergo an addition reaction with the unsaturated bonds in the waste plastic to achieve binding with the base material. The carboxyl group in the phenylacetic acid group can react with other groups to enhance the intermolecular interaction, and at the same time the benzene ring helps to improve the rigidity of the material.

[0306] Synthesis method:

[0307] Using 4-hydroxyphenylacetic acid and methyl-2-butenoyl chloride as raw materials, reacting in the presence of triethylamine to obtain 4-(3-methyl-2-butenoyloxy)phenylacetic acid. This synthesis method refers to the reported esterification reaction of acyl chloride and phenolic acid compounds.

[0308] Formulation implementation:

[0309] Using waste polystyrene (PS) as the base material, 78 parts by weight.

[0310] Adding 6 parts by weight of MBPA as a modifier.

[0311] Adding 10 parts by weight of the compound flame retardant of magnesium hydroxide-aluminum hydroxide-phosphate melamine salt.

[0312] Mixing in 5 parts by weight of carbon fiber as a reinforcing agent.

[0313] Introducing 3 parts by weight of antioxidant.

[0314] Process implementation:

[0315] After crushing the waste PS, premix it with other formulation components in a high-speed mixer for 30 minutes.

[0316] It enters a twin-screw extruder and is melt-blended at 180 - 200 °C with a screw speed of 170 rpm.

[0317] During the blending process, ultrasonic treatment is carried out for 22 minutes to promote the uniform dispersion of each component.

[0318] An injection molding process is used to make a sample of the recycled material.

[0319] Synergistic effect test:

[0320] Compared with the same formula material without added MBPA, the flexural strength of the material with added MBPA is increased by 26% and reaches 58 MPa. MBPA and carbon fiber act synergistically to enhance the rigidity of the material.

[0321] In the thermal stability test, the initial decomposition temperature is increased by 19 °C. The benzene ring of MBPA and the compound flame retardant of magnesium hydroxide - aluminum hydroxide - melamine phosphate act synergistically to effectively inhibit the decomposition of the material at high temperatures.

[0322] Compared with the materials modified with ordinary methyl - 2 - butenoyloxy compounds in the prior art, the flexural strength of the materials in this example is increased by 8% - 12%, and the initial decomposition temperature is increased by 8 - 12 °C. In the antioxidant performance test, the oxidation induction time of the material under accelerated oxidation conditions is extended by 8 - 12 minutes compared with similar modified materials in the prior art.

[0323] Example 16

[0324] Design of a new organic compound modifier:

[0325] An organic compound named ethyl 3-(4 - acryloyloxy)benzoate (EABA) is designed. In the waste plastic system, the acryloyloxy group can undergo an addition reaction with the unsaturated bonds in the waste plastic to achieve bonding with the base material. The ethyl benzoate group helps to improve the thermal stability and rigidity of the material, and the presence of the ethyl ester group may affect the flexibility and processing performance of the material.

[0326] Synthesis method:

[0327] Using ethyl 3 - hydroxybenzoate and acryloyl chloride as raw materials, reacting in the presence of triethylamine to obtain ethyl 3-(4 - acryloyloxy)benzoate. This synthesis method refers to the reported esterification reaction of acyl chloride and phenolic ester compounds.

[0328] Formulation implementation:

[0329] Using waste polypropylene (PP) and polyethylene (PE) mixed in a mass ratio of 3:2 as the base material, 70 parts by weight.

[0330] 7 parts by weight of EABA is added as a modifier.

[0331] Add 10 parts by weight of a compound flame retardant of magnesium hydroxide and aluminum hydroxide.

[0332] Mix in 6 parts by weight of glass fiber as a reinforcing agent.

[0333] Introduce 2 parts by weight of a light stabilizer.

[0334] Process implementation:

[0335] After mixing and pulverizing the waste plastics, premix them with other formulation components in a high-speed mixer for 32 minutes.

[0336] Feed into a twin-screw extruder, and carry out melt blending at 170 - 190 °C with a screw speed of 150 rpm.

[0337] During the blending process, perform microwave radiation treatment for 18 minutes to promote the uniform dispersion of each component and chemical reactions.

[0338] Adopt an injection molding process to make a sample of the recycled material.

[0339] Synergistic effect test:

[0340] Compared with the same formulation material without EABA added, the impact strength of the material with EABA added increased by 27%, reaching 30 kJ / m 2 . EABA and glass fiber have a synergistic effect, enhancing the toughness of the material.

[0341] In the flame retardancy performance test, the limiting oxygen index increased from 26% to 29%. The ethyl benzoate group of EABA and the compound flame retardant of magnesium hydroxide and aluminum hydroxide have a synergistic effect, forming a more stable flame retardant system at high temperatures.

[0342] Compared with the materials modified with ordinary acryloyloxy compounds in the prior art, the impact strength of the materials in this example increased by 9% - 13%, and the limiting oxygen index increased by 2 - 3 percentage points. In the weather resistance test, after 1300 hours of artificial accelerated aging, the retention rate of the mechanical properties of the materials is 9% - 13% higher than that of similar modified materials in the prior art.

[0343] Example 17

[0344] Design of a novel organic compound modifier:

[0345] Design an organic compound named 4-(2-methylacryloyloxy)phenylpropanoic acid (MPPA). In the waste plastic system, the methacryloyloxy group can undergo an addition reaction with the unsaturated bonds in the waste plastics to achieve bonding with the base material. The carboxyl group in the phenylpropanoic acid group can react with other groups to enhance the intermolecular interaction, and at the same time the benzene ring helps to improve the rigidity of the material.

[0346] Synthesis method:

[0347] Using 4-hydroxycinnamic acid and methacryloyl chloride as raw materials, reacting in the presence of triethylamine to obtain 4-(2-methacryloyloxy)cinnamic acid. This synthesis method refers to the reported esterification reaction of acyl chloride and phenolic acid compounds.

[0348] Formulation implementation:

[0349] Using waste polycarbonate (PC) and polyethylene terephthalate (PET) mixed in a mass ratio of 2:3 as the base material, 75 parts by weight.

[0350] Adding 8 parts by weight of MPPA as a modifier.

[0351] Adding 10 parts by weight of a compound flame retardant of magnesium hydroxide-aluminum hydroxide-phosphate melamine salt.

[0352] Mixing in 5 parts by weight of aramid fiber as a reinforcing agent.

[0353] Introducing 3 parts by weight of an ultraviolet absorber.

[0354] Process implementation:

[0355] After mixing and crushing the waste plastics, premixing with other formulation components in a high-speed mixer for 31 minutes.

[0356] Feeding into a twin-screw extruder, melt-blending at 230 - 250 °C, screw speed 160 rpm.

[0357] During the blending process, treating with high-voltage pulsed electric field, electric field strength 2.8 kV / cm, pulse frequency 18 Hz, treating for 20 minutes to promote the orientation arrangement and interfacial combination of each component.

[0358] Using an injection molding process to make a recycled material sample.

[0359] Synergistic effect test:

[0360] Compared with the same formulation material without adding MPPA, the tensile strength of the material with added MPPA increased by 28%, reaching 78 MPa. MPPA and aramid fiber synergistically enhanced the internal structure of the material.

[0361] In the thermal stability test, the initial decomposition temperature increased by 20 °C. The benzene ring of MPPA and the compound flame retardant of magnesium hydroxide-aluminum hydroxide-phosphate melamine salt synergistically and effectively inhibited the decomposition of the material at high temperature.

[0362] Compared with the materials modified with ordinary methacryloxy compounds in the prior art, the tensile strength of the materials in this example is increased by 10% - 14%, and the initial decomposition temperature is increased by 10 - 14 °C. In the weather resistance test, after 1400 hours of artificial accelerated aging, the retention rate of the mechanical properties of the materials is 10% - 14% higher than that of similar modified materials in the prior art.

[0363] Example 17

[0364] The structure, composition, and properties of the materials are confirmed through various analytical techniques. FT-IR spectroscopy can accurately identify characteristic functional groups in compounds. For example, in the examples, specific absorption peaks of the novel organic compounds can verify their structural compositions. 1 HNMR further determines the environment and quantity of hydrogen atoms in the molecule through chemical shifts and peak areas, assisting in clarifying the compound structure. Elemental analysis gives the proportion of each element in a quantitative form to ensure that the synthesized product meets expectations. These techniques corroborate each other, ensuring from different perspectives that the newly synthesized modifier and recycled materials have accurate chemical structures as shown in Table 1.

[0365] Table 1 Characterization and Verification

[0366]

[0367]

[0368]

[0369] The comparative synergy of the present invention is shown in Table 2 below:

[0370] Table 2 Comparative Synergy

[0371]

[0372]

[0373]

[0374]

[0375] Introduction of Metal-Organic Framework Derived Porous Carbon-Silica Composite Adsorbents Metal-organic frameworks (MOFs) have a highly ordered porous structure and a large specific surface area, and can be transformed into porous carbon materials through high-temperature pyrolysis. When combined with silica, the adsorption properties of porous carbon and the chemical stability and mechanical properties of silica can be utilized to effectively remove impurities and harmful gases in waste plastics, while enhancing the properties of recycled materials. The porous structure of the porous carbon-silica composite provides a large number of adsorption sites, which can capture impurities, residual monomers, and harmful gases in waste plastics through physical and chemical adsorption. Silica enhances the mechanical strength of the composite, enabling it to stably exist in the waste plastic system and contributing to improving the processing performance of the material. In addition, the synergistic effect between porous carbon and silica may promote the adsorption and transformation of certain specific pollutants.

[0376] Use of Dendrimer-Based Multifunctional Compatibilizers Dendrimers have a highly branched structure and a large number of end groups, and can be made to have various functional groups through molecular design. When used as a compatibilizer in the waste plastic recycling system, it can improve the compatibility between different polymers and simultaneously play roles such as toughening and strengthening. The end groups of dendrimers react chemically or physically entangle with the active groups in the molecular chains of waste plastics, forming a bridge between different polymer phases, reducing the surface tension at the phase interface, and increasing the bonding strength at the phase interface. Its branched structure can fill between the polymer molecular chains, increasing the interaction between molecular chains, thus achieving the effects of toughening and strengthening. In addition, by adjusting the structure and functional groups of dendrimers, targeted compatibility with different types of waste plastics can be achieved.

[0377] Addition of Photothermal Responsive Polypyrrole-Carbon Nanotube Composite Additives Polypyrrole has good photothermal conversion performance and can absorb light energy and convert it into heat energy under light irradiation. Carbon nanotubes have excellent mechanical properties, electrical conductivity, and thermal conductivity. When the two are combined, the recycled waste plastic materials can have photothermal response characteristics while improving the mechanical and electrical properties of the materials. Under light irradiation, polypyrrole absorbs photon energy, generates a thermal effect, and raises the local temperature of the material. This not only helps to promote the processing and shaping of waste plastics but also can repair the microscopic defects inside the material to a certain extent. Carbon nanotubes form a network structure in the material, enhancing the tensile strength, toughness, and electrical conductivity of the material. The synergistic effect between polypyrrole and carbon nanotubes further improves the comprehensive performance of the material.

[0378] The ultrasonic-microwave synergistic catalytic depolymerization process is adopted. Ultrasonic and microwave have different action mechanisms. Ultrasonic can generate cavitation effect, forming a local high-temperature and high-pressure environment in the liquid, promoting the breaking of chemical bonds and the activation of molecules. Microwave has the characteristics of rapid and uniform heating, and can quickly increase the temperature of waste plastics. Through the ultrasonic-microwave synergistic catalytic depolymerization process, the efficient depolymerization of waste plastics can be achieved at a lower temperature, reducing energy consumption and the generation of by-products. Under the synergistic action of ultrasonic and microwave, waste plastic molecules are affected by the shock waves and microjets generated by the cavitation effect, and the molecular chains break. At the same time, the thermal effect of microwave intensifies the molecular motion, further promoting the depolymerization reaction. The activity of the catalyst is enhanced under the synergistic action of ultrasonic and microwave, and it can more effectively catalyze the depolymerization reaction of waste plastics. In addition, the synergistic action of ultrasonic and microwave can also promote the diffusion and separation of depolymerization products, improving the reaction efficiency.

[0379] Introduce microencapsulated epoxy resin with self-healing function. The epoxy resin is microencapsulated and evenly dispersed in the recycled waste plastic material. When the material is damaged, the microcapsules rupture, releasing the epoxy resin, which undergoes a curing reaction under the action of an initiator to achieve self-healing of the material damage. When cracks are generated in the material under external force, the epoxy resin will flow out when the microcapsules are punctured during the crack propagation process. After the initiator contacts the epoxy resin, it initiates the curing reaction of the epoxy resin to fill the cracks and restore the continuity and mechanical properties of the material. The shell material of the microcapsules usually has good stability and compatibility with waste plastics, ensuring that the microcapsules remain intact during the material processing and use until they are damaged and release the epoxy resin.

[0380] Use the supercritical fluid-assisted reactive extrusion process. Supercritical fluids have good solubility, diffusivity, and mass transfer properties. Introducing supercritical fluids during the reactive extrusion process can promote the reaction between waste plastics and additives, improve the reaction efficiency and the uniformity of the product. At the same time, supercritical fluids can also play a role in plasticizing and reducing the melt viscosity, improving the processing performance of the material. Supercritical fluids dissolve in the waste plastic melt, increasing the distance between molecular chains, reducing the intermolecular interaction force, and improving the mobility of molecular chains. This helps the reaction between waste plastics and additives, promotes the formation of chemical bonds and the recombination of molecular chains. In addition, the presence of supercritical fluids can make the reaction system more uniform, reducing local overheating or uneven reaction phenomena. During the extrusion process, the rapid expansion of supercritical fluids can generate a microporous structure, further improving the material properties. After premixing waste plastics and additives in a high-speed mixer, they are fed into a reactive extruder. Supercritical carbon dioxide or supercritical nitrogen is introduced into a specific area of the extruder, with the pressure controlled at 10 - 20 MPa and the temperature controlled at 180 - 250 °C. By adjusting the flow rate of supercritical fluids and the screw speed of the extruder, the control of the reactive extrusion process is achieved.

[0381] Waste biomass fibers have the advantages of wide sources, renewability, and low cost, but their mechanical properties are relatively low. Nanocellulose whiskers have characteristics such as high strength, high modulus, and nanoscale dimensions. By combining the two, the waste biomass fibers can be reinforced by nanocellulose whiskers, while improving their compatibility with waste plastics and enhancing the mechanical properties of the recycled materials. The nanocellulose whiskers are uniformly dispersed among the waste biomass fibers and combined with the biomass fibers through physical adsorption and chemical bonding to form a reinforcing network structure. In the waste plastic matrix, the waste biomass fibers and the nanocellulose whisker composite reinforcement can entangle with the plastic molecular chains, improving the interfacial bonding strength of the material. When the material is subjected to external forces, the stress can be effectively transmitted to the reinforcement through the interface, thereby enhancing the tensile strength, flexural strength, and toughness of the material.

[0382] During the molding process, an electric field and a magnetic field are applied simultaneously. Utilizing the polarity of the waste plastic molecular chains and the magnetism of certain additives, the molecular chains and additives are oriented and arranged under the action of the electric and magnetic fields. By controlling the parameters of the electric and magnetic fields, the ordered arrangement of the molecular chains and additives can be achieved, thereby improving the mechanical properties and anisotropy of the material to meet the requirements of different application scenarios. The polar groups in the waste plastic molecular chains are polarized under the action of the electric field, and the molecular chains are oriented along the direction of the electric field. At the same time, the magnetic additives also undergo orientation under the action of the magnetic field, synergistically with the orientation of the molecular chains. This ordered arrangement forms a regular structure after molding, enhancing the mechanical properties of the material in a specific direction. In addition, the synergistic effect of the electric and magnetic fields can also improve the crystallization behavior of the material, increasing the crystallinity and crystallization quality.

[0383] Polylactic acid (PLA) has good biodegradability and mechanical properties, and polybutylene adipate terephthalate (PBAT) has excellent flexibility and processability. By making a copolymer of the two, while improving the toughness of the waste plastic recycled material, the material can be endowed with biodegradable properties, expanding its application range. The polylactic acid-polybutylene adipate terephthalate copolymer is dispersed in the waste plastic matrix, forming a sea-island structure. When the material is subjected to external impact, the copolymer phase can deform, absorb energy, and prevent the propagation of cracks, thereby enhancing the toughness of the material. At the same time, the presence of polylactic acid makes the material biodegradable and can gradually decompose in the natural environment, reducing environmental pollution.

[0384] Preliminarily enzymatically hydrolyze waste plastics using PET hydrolase to disrupt the regularity of their molecular chains and reduce the molecular weight. Then, through chemical activation treatment, introduce active groups to improve the reactivity and processability of waste plastics. This combined pretreatment process can give full play to the advantages of microbial enzymatic hydrolysis and chemical activation, improving the regeneration effect of waste plastics. During the microbial enzymatic hydrolysis process, the enzyme can specifically act on the chemical bonds in the molecular chains of waste plastics, causing them to break and form small molecular fragments. Chemical activation treatment introduces active groups such as carboxyl groups and hydroxyl groups onto the molecular chains of waste plastics through chemical reactions. These active groups not only improve the reactivity between waste plastics and additives but also improve their dispersibility and compatibility during subsequent processing.

Claims

1. A method for recycling waste plastics, characterized in that: include: S1 base material selection: 70-80 parts by weight of waste PET is used as the base material; S2 adds composite components: The method comprises adding 1-4 parts by weight of a fullerene-amino acid composite modifier, wherein the mass ratio of fullerene to amino acid is 1:3; adding 2-5 parts by weight of a cyclodextrin-graphene quantum dot composite additive, wherein the mass ratio of cyclodextrin to graphene quantum dot is 4:1; mixing in 3-6 parts by weight of a trehalose-nano titanium dioxide composite photocatalytic enhancer, wherein the mass ratio of trehalose to nano titanium dioxide is 2:1; introducing 4-8 parts by weight of anthocyanin-polycaprolactone composite degradable functional agent, wherein the mass ratio of anthocyanin to polycaprolactone is 1:5 ; Add 5-9 parts by weight of quercetin-starch-based microsphere composite adsorption purifier, the mass ratio of quercetin to starch-based microspheres is 1:6; add 3-7 parts by weight of capsaicin-nano zinc oxide composite antibacterial and anti-ultraviolet agent, the mass ratio of capsaicin to nano zinc oxide is 1:4; mix 4-8 parts by weight of vanillin-polyvinyl butyral composite plasticizer, the mass ratio of vanillin to polyvinyl butyral is 1:4; add 5-9 parts by weight of berberine-bentonite composite adsorption modifier, the mass ratio of berberine to bentonite is 1:5; S3 crushes the waste PET, mixes the components with the waste PET particles in a high-speed mixer for 30 minutes, and sends them into a twin-screw extruder for melt blending at a temperature of 240-260°C. The screw speed is controlled at 180-200rpm, extruded into granules, and made into recycled plastic products through injection molding.

2. The method for recycling waste plastics according to claim 1, characterized in that: The method further comprises the step S3 of adding 4-10 parts by weight of an organic compound modifier to the base material, wherein the organic compound modifier is one or more of 4-(3-acryloyloxy-2-hydroxypropoxy)benzoic acid, 3-(2-methacryloyloxy)benzoic acid, 4-(3-crotonoyloxy)benzyl alcohol, 3-(2-butenoyloxy)benzoic acid methyl ester, 4-(3-methyl-2-butenoyloxy)phenylacetic acid, 3-(4-acryloyloxy)benzoic acid ethyl ester, 4-(2-methacryloyloxy)phenylpropionic acid, 4-(3-acryloyloxy-2-methoxypropoxy)benzoic acid methyl ester, 3-(2-methacryloyloxy-3-methoxy)phenylethyl ester, and 4-(3-crotonoyloxy-2-ethoxy)phenylpropionic acid butyl ester.

3. The method for recycling waste plastics according to claim 2, characterized in that: The organic compound modifier 4-(3-acryloyloxy-2-hydroxypropoxy)benzoic acid is synthesized by the following method: 4-hydroxybenzoic acid and epichlorohydrin are used as raw materials at a molar ratio of 1:1.2-1:1.5, react at 60-80°C for 3-5 hours in the presence of an alkaline catalyst such as sodium hydroxide or potassium hydroxide to generate 3-(4-hydroxyphenoxy)-2-hydroxypropyl ether, and then react with acryloyl chloride at a molar ratio of 1:1.1-1:1.3 in the presence of triethylamine at 0-10°C for 2-3 hours to obtain the obtained product.

4. The method for recycling waste plastics according to claim 2, characterized in that: The synthesis method of the organic compound modifier 3-(2-methacryloyloxy)benzoic acid is as follows: 3-hydroxybenzoic acid and methacryloyl chloride are used as raw materials in a molar ratio of 1:1.1-1:1.3, and react at 0-10° C. for 2-3 hours in the presence of triethylamine to obtain the obtained product.

5. The method for recycling waste plastics according to claim 2, characterized in that: The synthesis method of the organic compound modifier 4-(3-crotonyloxy)benzyl alcohol is as follows: 4-hydroxybenzyl alcohol and crotonyl chloride are used as raw materials in a molar ratio of 1:1.1-1:1.3, and react at 0-10° C. for 2-3 hours in the presence of triethylamine to obtain the modified organic compound 4-(3-crotonyloxy)benzyl alcohol.

6. The method for recycling waste plastics according to claim 2, characterized in that: The synthesis method of the organic compound modifier 3-(2-butenoyloxy) methyl benzoate is as follows: 3-hydroxybenzoic acid methyl ester and crotonyl chloride are used as raw materials in a molar ratio of 1:1.1-1:1.3, and react at 0-10° C. for 2-3 hours in the presence of triethylamine to obtain the obtained product.

7. The method for recycling waste plastics according to claim 2, characterized in that: The synthesis method of the organic compound modifier 4-(3-methyl-2-butenoyloxy)phenylacetic acid is as follows: 4-hydroxyphenylacetic acid and methyl-2-butenoyl chloride are used as raw materials in a molar ratio of 1:1.1-1:1.3, and react at 0-10° C. for 2-3 hours in the presence of triethylamine to obtain the modified organic compound 4-(3-methyl-2-butenoyloxy)phenylacetic acid.

8. The method for recycling waste plastics according to claim 2, characterized in that: The synthesis method of the organic compound modifier 3-(4-acryloyloxy)ethyl benzoate is as follows: 3-hydroxyethyl benzoate and acryloyl chloride are used as raw materials in a molar ratio of 1:1.1-1:1.3, and react at 0-10° C. for 2-3 hours in the presence of triethylamine to obtain the modified organic compound.

9. The method for recycling waste plastics according to claim 2, characterized in that: The synthesis method of the organic compound modifier 4-(2-methacryloyloxy)phenylpropionic acid is as follows: 4-hydroxyphenylpropionic acid and methacryloyl chloride are used as raw materials at a molar ratio of 1:1.1-1:1.3, and react at 0-10° C. for 2-3 hours in the presence of triethylamine to obtain the modified organic compound 4-(2-methacryloyloxy)phenylpropionic acid.

10. The method for recycling waste plastics according to claim 2, characterized in that: The synthesis method of the organic compound modifier 4-(3-acryloyloxy-2-methoxypropoxy) methyl benzoate is as follows: 4-hydroxybenzoic acid methyl ester and 3-(2-methoxy-3-acryloyloxy) chloropropane are used as raw materials at a molar ratio of 1:1.2-1:1.5, and react at 60-80°C for 3-5 hours in the presence of an alkaline catalyst such as sodium hydroxide or potassium hydroxide to obtain the obtained product.

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