PC material based on waste PC car lamp and preparation method of PC material

Abstract

The invention relates to the field of high polymer materials, and particularly discloses a PC material based on waste PC car lamps and a preparation method thereof.The PC material is prepared from, by weight, 80-90 parts of waste PC particles, 5-10 parts of nano titanium dioxide, 1-5 parts of modified silane coupling agent, 5-8 parts of flexibilizer, 1-5 parts of lubricant, 1-3 parts of ultraviolet light absorber and 1-3 parts of antistatic agent; the molecular structure of the modified silane coupling agent contains fluorine elements and phenolic hydroxyl groups, the tensile property, high-temperature resistance, oxidation resistance and the like of the PC material based on the waste PC automobile lamp are jointly improved, and the prepared PC material can be widely applied to the fields of automobile lamps, electronic product shells and the like and has wide application prospects.

Description

Technical Field

[0001] The invention relates to the field of polymer materials, and in particular to a PC material based on waste PC car lamps and a preparation method thereof. Background Art

[0002] Polycarbonate (PC), as a high-performance plastic material, has been widely used in the automotive industry, especially in the field of car lamp manufacturing, due to its excellent mechanical properties, optical properties and heat resistance. However, with the increase in automobile production, the recycling and reuse of waste PC car lamps has become increasingly prominent. If it can be effectively recycled and reprocessed into PC materials with certain properties, it can not only significantly reduce the demand for virgin PC materials and save petroleum resources, but also reduce environmental problems caused by improper treatment of waste PC, and achieve resource recycling and sustainable development.

[0003] The patent with application number CN202411193259.2 provides a recycled PC / PET regrind and its preparation method. The formula of the recycled PC / PET regrind is as follows: 50-80 parts of PET recycled material, 30-60 parts of PC recycled material, 20-25 parts of reinforcing agent, 2-4 parts of compatibilizer, and 1-3 parts of antioxidant. The reinforcing agent is composed of diatomaceous earth, allyl polyoxyethylene methyl end-capped polyether, long-chain alkyl silane coupling agent and pentaerythritol glycidyl ether. The preparation process includes mixing the above raw materials evenly, melt extruding, cooling, drying and pelletizing, and finally obtaining PC / PET recycled material particles, which mainly show good mechanical strength and wear resistance. However, the PC / PET recycled material obtained in this application has limitations in performance. For example, in situations where higher heat resistance and chemical resistance are required, the PC / PET recycled material may not meet these specific requirements, thereby limiting its applicability in diversified application scenarios. The patent with application number CN202311579418.8 provides a PC waste composite ABS material and its preparation method. The formula of the material is composed of the following raw materials in parts by weight: 30-80 parts of PC waste, 10-50 parts of ABS waste, 1-5 parts of plasticizer, 20-50 parts of reinforcing agent, and 1-3 parts of stabilizer. The reinforcing agent is composed of fibers, expansion fillers, organosilicon hybrid aromatic acetylene resins, glycidyl ether derivatives, N-methylpyrrolidone and other ingredients. By adding reinforcing agents, the mechanical strength and wear resistance of the composite material are significantly improved. However, the stabilizers and plasticizers used in the material will limit the performance of the material in high temperature applications, such as heat resistance and aging resistance, so the composite material still has room for improvement in high temperature stability.

[0004] Therefore, developing a PC material based on waste PC headlights with excellent mechanical properties, high temperature resistance and oxidation resistance is of great significance to promoting the sustainable development of the plastic recycling industry. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a PC material based on waste PC headlights and a preparation method thereof. The silane coupling agent is chemically modified, and the modified silane coupling agent is compounded with waste PC particles, nano titanium dioxide and other raw materials to significantly improve the tensile strength, oxidation resistance and high temperature resistance of the PC material, thereby obtaining a PC material based on waste PC headlights with multiple performance advantages.

[0006] The technical solution adopted by the present invention to achieve the above-mentioned purpose is: A PC material based on waste PC car lamps, comprising the following raw materials in parts by weight: 80-90 parts of waste PC particles, 5-10 parts of nano titanium dioxide, 1-5 parts of modified silane coupling agent, 5-8 parts of toughening agent, 1-5 parts of lubricant, 1-3 parts of ultraviolet absorber, and 1-3 parts of antistatic agent. The preparation method of the modified silane coupling agent is as follows: Step S1, adding silane coupling agent KH-560, 3-fluoro-5-(trifluoromethyl)phenylacetic acid and chromium isooctanoate to toluene at 70-80° C. with stirring, reacting for 1-3 hours, cooling to room temperature, and purifying to obtain an intermediate; Step S2, adding the intermediate obtained in step S1, aluminum chloride and dihydrocaffeic acid to N,N-dimethylformamide at 80-100° C. with stirring, reacting for 2-4 hours, cooling to room temperature, and purifying to obtain a modified silane coupling agent; The synthetic route of modified silane coupling agent is as follows: ; .

[0007] Furthermore, in step S1, the molar ratio of the silane coupling agent KH-560, 3-fluoro-5-(trifluoromethyl)phenylacetic acid and chromium isooctanoate is 10:4-6:0.05-0.08, and the amount of the silane coupling agent KH-560 added to toluene is 0.06-0.08 g / mL.

[0008] Furthermore, in step S2, the molar ratio of the intermediate, aluminum chloride and dihydrocaffeic acid is 1:0.05-0.06:0.8-0.9, and the amount of dihydrocaffeic acid added to N,N-dimethylformamide is 0.03-0.05 g / mL.

[0009] Furthermore, the toughening agent is one or more of methyl methacrylate-butadiene-styrene copolymer, acrylonitrile-butadiene-styrene copolymer, POE plastic, and GMA plastic.

[0010] Furthermore, the lubricant is one or more of stearamide, calcium stearate, zinc stearate, and pentaerythritol stearate.

[0011] Furthermore, the ultraviolet absorber is one or more of 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-n-octyloxybenzophenone, and pentaerythritol tetrakis(2-cyano-3,3-diphenylacrylate).

[0012] Furthermore, the antistatic agent is one or more of dibenzoyl peroxide, diisopropylbenzene peroxide, isocyanate, and sodium dodecylbenzene sulfonate.

[0013] The present invention also provides a method for preparing a PC material based on waste PC car lamps, comprising the following steps: (1) Blending waste PC particles, nano titanium dioxide, modified silane coupling agent, toughening agent, lubricant, ultraviolet absorber and antistatic agent under nitrogen protection to obtain a blend; (2) Under nitrogen protection, the blend obtained in step (1) is melted and extruded into granules by a screw extruder to obtain the obtained product.

[0014] The present invention has the following beneficial effects: The invention adopts a chemical modification method to prepare a modified silane coupling agent, and then compound the modified silane coupling agent with waste PC particles from waste PC car lamps and other raw materials to obtain PC materials suitable for various fields. The synthesis of the modified silane coupling agent first obtains an intermediate through a ring-opening reaction between the carboxyl group of 3-fluoro-5-(trifluoromethyl)phenylacetic acid and the epoxy group of the silane coupling agent KH-560; and then obtains a modified silane coupling agent through an esterification reaction between the hydroxyl group of the intermediate and the carboxyl group of dihydrocaffeic acid. The modified silane coupling agent contains fluorine atoms and phenolic hydroxyl groups in its structure. Among them, CF bonds with higher bond energy can be formed between fluorine atoms and carbon atoms. When the modified silane coupling agent molecules are heated, higher energy is required to destroy the CF bonds. Therefore, the high stability of the CF bonds ensures the stability of the molecular structure of the modified silane coupling agent, so that the composite material can withstand high temperature environments, thereby enhancing the heat resistance of the PC material; in addition, the electronegativity of fluorine atoms is relatively large, which will attract more electrons, and the electron cloud distribution is more concentrated. The dense electron cloud can provide stronger electron repulsion, thereby stabilizing the molecular structure of the modified silane coupling agent, which makes it relatively difficult to conduct heat in the composite material. When the external temperature rises, it is difficult for the heat to be quickly transferred to the inside of the PC material, so that the PC material can maintain a low temperature for a certain period of time, showing good high temperature resistance. Phenolic hydroxyl groups can provide hydrogen atoms to capture free radicals. When the material is exposed to ultraviolet rays or in a high-temperature oxygen environment, the chemical bonds in the molecular chain will break and produce free radicals. Phenolic hydroxyl groups can react with these free radicals, transfer hydrogen atoms to the free radicals, and form relatively stable phenoloxy free radicals, thereby effectively interrupting the free radical chain reaction and inhibiting the oxidation process of the material. The modified silane coupling agent, with its special structure, can better disperse the antioxidant function of phenolic hydroxyl groups in the PC material system, enhance the efficiency of removing free radicals in the surrounding environment, and improve the overall antioxidant performance of PC materials. Phenolic hydroxyl groups can also absorb ultraviolet energy. This is because the benzene ring structure where the phenolic hydroxyl group is located has a conjugated π electron system and can absorb ultraviolet photons in a specific wavelength range. This makes the modified silane coupling agent have an anti-ultraviolet aging effect, so that when the PC material is exposed to sunlight, the ultraviolet photons can be absorbed by the phenolic hydroxyl groups in the PC material system, avoiding ultraviolet rays directly acting on the molecular chains of the PC material to trigger photochemical reactions.

[0015] The present invention compounds the waste PC particles, nano titanium dioxide, modified silane coupling agent and other raw materials to obtain PC materials based on waste PC headlights. The modified silane coupling agent can form chemical bonds between nano titanium dioxide and organic matrices such as toughening agents and lubricants, thereby enhancing the dispersibility and interface bonding force of nano titanium dioxide in the PC material system, more effectively exerting the reinforcing effect of nano titanium dioxide in the PC material, and further improving the tensile strength, anti-oxidation and other properties of the PC material. The PC material based on waste PC headlights prepared by the present invention has excellent properties such as high temperature resistance, anti-oxidation, and high tensile strength, so that the PC material has a wide range of application prospects. DETAILED DESCRIPTION

[0016] The following will be combined with the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0017] The raw materials used in the following examples are all common commercial products. The particle size of nano titanium dioxide is 50-200nm, purchased from Shanghai Yingfeng Ruihuang Metal Materials Co., Ltd., with a brand of 5951; methyl methacrylate-butadiene-styrene copolymer is purchased from Shanghai Langqi Plastic Raw Materials Co., Ltd., model ZYLAR® 650, brand Benling; acrylonitrile-butadiene-styrene copolymer is purchased from Shanghai Zhaohe Plastic Co., Ltd., model ABS PA-757, brand Chimei POLYLAC®; POE plastic is purchased from Shanghai Oushuo Plastic Co., Ltd., model 6102FL, brand ExxonMobil; GMA plastic is purchased from Guangdong Dingxin Polymer Technology Co., Ltd., model 4170, brand DuPont; waste PC particles are derived from waste transparent PC car lights, which are obtained by crushing, washing and flotation, with a particle size of ≤10mm and a density of 1.22g / cm 3 , purity is 80%.

[0018] Example 1 A PC material based on waste PC car lamps, comprising the following raw materials in parts by weight: 80 parts of waste PC particles, 10 parts of nano titanium dioxide, 1 part of modified silane coupling agent, 5 parts of toughening agent, 1 part of lubricant, 1 part of ultraviolet absorber, and 1 part of antistatic agent; The toughening agent is POE plastic, the lubricant is stearamide, the UV absorber is 2,4-dihydroxybenzophenone, and the antistatic agent is dibenzoyl peroxide; The preparation method of the modified silane coupling agent is as follows: Step S1, adding silane coupling agent KH-560, 3-fluoro-5-(trifluoromethyl)phenylacetic acid and chromium isooctanoate to toluene at 70° C. with stirring, reacting for 3 hours, cooling to room temperature and filtering to obtain a filtrate, then rotary evaporating the filtrate to remove toluene at a temperature of 60° C., a rotation rate of 120 rpm, and a vacuum degree of -0.08-0.1 MPa to obtain an intermediate, wherein the molar ratio of the silane coupling agent KH-560, 3-fluoro-5-(trifluoromethyl)phenylacetic acid and chromium isooctanoate is 10:4:0.05, and the amount of the silane coupling agent KH-560 added to the toluene is 0.06 g / mL; Step S2, adding the intermediate obtained in step S1, aluminum chloride and dihydrocaffeic acid to N,N-dimethylformamide at 80° C. with stirring, reacting for 4 hours, cooling to room temperature and filtering to obtain a filtrate, then rotary evaporating the filtrate to remove N,N-dimethylformamide at a temperature of 80° C., a rotation rate of 120 rpm and a vacuum degree of 25-50 mbar to obtain a modified silane coupling agent, wherein the molar ratio of the intermediate, aluminum chloride and dihydrocaffeic acid is 1:0.05:0.8, and the amount of dihydrocaffeic acid added to N,N-dimethylformamide is 0.03 g / mL; The synthetic route of modified silane coupling agent is as follows: ; ; The nuclear magnetic resonance results of the modified silane coupling agent are: 1H NMR (300MHz, acetone-d6) δ 9.48 (s, 2H), 7.43 (s, 1H), 7.13-7.16 (m, 2H), 6.52-6.61 (m, 3H), 5.41-5.46 (m, 1H), 4.17-4.42 (m, 2H), 3.71 (t, 3H), 3.46-3.55 (m, 10H), 3.29-3.36 (m, 2H), 2.85 (t, 2H), 2.58 (t, 2H), 1.40-1.48 (m, 2H), 0.56 (t, 2H).

[0019] A method for preparing PC material based on waste PC car lamps, comprising the following steps: (1) Waste PC particles, nano titanium dioxide, modified silane coupling agent, toughening agent, lubricant, ultraviolet absorber and antistatic agent are mixed to obtain a blend, and the mixture is mixed for 30 minutes under nitrogen protection at a mixing temperature of 80°C; (2) Under nitrogen protection, the blend obtained in step (1) is melted and extruded into granules through a twin-screw extruder at a temperature of 250° C., a screw speed of 450-500 rpm, and a vacuum degree of 0.1-0.04 MPa to obtain the obtained product.

[0020] Example 2 A PC material based on waste PC car lamps, comprising the following raw materials in parts by weight: 90 parts of waste PC particles, 5 parts of nano titanium dioxide, 5 parts of modified silane coupling agent, 8 parts of toughening agent, 5 parts of lubricant, 3 parts of ultraviolet absorber, and 3 parts of antistatic agent; The toughening agent is methyl methacrylate-butadiene-styrene terpolymer, the lubricant is calcium stearate, the ultraviolet absorber is 2-hydroxy-4-methoxybenzophenone, and the antistatic agent is diisopropylbenzene peroxide; The preparation method of the modified silane coupling agent is as follows: Step S1, adding silane coupling agent KH-560, 3-fluoro-5-(trifluoromethyl)phenylacetic acid and chromium isooctanoate to toluene at 80° C. with stirring, reacting for 1 hour, cooling to room temperature and filtering to obtain a filtrate, then rotary evaporating the filtrate to remove toluene at a temperature of 60° C., a rotation rate of 120 rpm, and a vacuum degree of -0.08-0.1 MPa to obtain an intermediate, wherein the molar ratio of the silane coupling agent KH-560, 3-fluoro-5-(trifluoromethyl)phenylacetic acid and chromium isooctanoate is 10:6:0.08, and the amount of the silane coupling agent KH-560 added to the toluene is 0.08 g / mL; Step S2, adding the intermediate obtained in step S1, aluminum chloride and dihydrocaffeic acid to N,N-dimethylformamide at 100° C. with stirring, reacting for 2 hours, cooling to room temperature and filtering to obtain a filtrate, then rotary evaporating the filtrate at a temperature of 80° C., a rotation rate of 120 rpm and a vacuum degree of 25-50 mbar to remove N,N-dimethylformamide to obtain a modified silane coupling agent, wherein the molar ratio of the intermediate, aluminum chloride and dihydrocaffeic acid is 1:0.06:0.9, and the amount of dihydrocaffeic acid added to N,N-dimethylformamide is 0.05 g / mL; A method for preparing a PC material based on waste PC car lamps is prepared according to the method of Example 1.

[0021] Example 3 A PC material based on waste PC car lamps, comprising the following raw materials in parts by weight: 85 parts of waste PC particles, 8 parts of nano titanium dioxide, 3 parts of modified silane coupling agent, 6 parts of toughening agent, 2 parts of lubricant, 2 parts of ultraviolet absorber, and 2 parts of antistatic agent; The toughening agent is acrylonitrile-butadiene-styrene copolymer, the lubricant is pentaerythritol stearate, the ultraviolet absorber is 2-hydroxy-4-n-octyloxybenzophenone, and the antistatic agent is isocyanate; The preparation method of the modified silane coupling agent is as follows: Step S1, adding silane coupling agent KH-560, 3-fluoro-5-(trifluoromethyl)phenylacetic acid and chromium isooctanoate to toluene at 75° C. with stirring, reacting for 2 hours, cooling to room temperature and filtering to obtain a filtrate, then removing toluene from the filtrate by rotary evaporation at a temperature of 60° C., a rotation rate of 120 rpm, and a vacuum degree of -0.08-0.1 MPa to obtain an intermediate, wherein the molar ratio of the silane coupling agent KH-560, 3-fluoro-5-(trifluoromethyl)phenylacetic acid and chromium isooctanoate is 10:5:0.07, and the amount of the silane coupling agent KH-560 added to the toluene is 0.07 g / mL; Step S2, adding the intermediate obtained in step S1, aluminum chloride and dihydrocaffeic acid to N,N-dimethylformamide at 90° C. with stirring, reacting for 3 hours, cooling to room temperature and filtering to obtain a filtrate, then rotary evaporating the filtrate at a temperature of 80° C., a rotation rate of 120 rpm and a vacuum degree of 25-50 mbar to remove N,N-dimethylformamide to obtain a modified silane coupling agent, wherein the molar ratio of the intermediate, aluminum chloride and dihydrocaffeic acid is 1:0.055:0.85, and the amount of dihydrocaffeic acid added to N,N-dimethylformamide is 0.04 g / mL; A method for preparing a PC material based on waste PC car lamps is prepared according to the method of Example 1.

[0022] Comparative Example 1 A PC material based on waste PC car lamps, comprising the following raw materials in parts by weight: 85 parts of waste PC particles, 3 parts of nano titanium dioxide, 0.5 parts of modified silane coupling agent, 6 parts of toughening agent, 2 parts of lubricant, 2 parts of ultraviolet absorber, and 2 parts of antistatic agent; The toughening agent is acrylonitrile-butadiene-styrene copolymer, the lubricant is pentaerythritol stearate, the ultraviolet absorber is 2-hydroxy-4-n-octyloxybenzophenone, and the antistatic agent is isocyanate; The preparation method of the modified silane coupling agent is as follows: adding silane coupling agent KH-560, 3-fluoro-5-(trifluoromethyl)phenylacetic acid and chromium isooctanoate to toluene at 75° C. and stirring, reacting for 2 hours, cooling to room temperature and filtering to obtain a filtrate, then removing toluene from the filtrate by rotary evaporation at a temperature of 60° C., a rotation rate of 120 rpm, and a vacuum degree of -0.08-0.1 MPa to obtain a modified silane coupling agent, wherein the molar ratio of the silane coupling agent KH-560, 3-fluoro-5-(trifluoromethyl)phenylacetic acid and chromium isooctanoate is 10:5:0.07, and the amount of the silane coupling agent KH-560 added to toluene is 0.07 g / mL; A method for preparing a PC material based on waste PC car lamps is prepared according to the method of Example 1.

[0023] Comparative Example 2 A PC material based on waste PC car lamps, comprising the following raw materials in parts by weight: 70 parts of waste PC particles, 6 parts of nano titanium dioxide, 0.5 parts of silane coupling agent KH-560, 6 parts of toughening agent, 2 parts of lubricant, 2 parts of ultraviolet absorber, and 2 parts of antistatic agent; The toughening agent is acrylonitrile-butadiene-styrene copolymer, the lubricant is pentaerythritol stearate, the ultraviolet absorber is 2-hydroxy-4-n-octyloxybenzophenone, and the antistatic agent is isocyanate; A method for preparing PC material based on waste PC car lamps, comprising the following steps: (1) Waste PC particles, nano titanium dioxide, silane coupling agent KH-560, toughening agent, lubricant, ultraviolet absorber, and antistatic agent are mixed to obtain a blend, and the mixture is mixed for 30 minutes under nitrogen protection at a mixing temperature of 80°C; (2) Under nitrogen protection, the blend obtained in step (1) is melted and extruded into granules through a twin-screw extruder at a temperature of 250° C., a screw speed of 450-500 rpm, and a vacuum degree of 0.1-0.04 MPa to obtain the obtained product.

[0024] Comparative Example 3 A PC material based on waste PC car lights, comprising the following raw materials in parts by weight: 70 parts of waste PC particles, 6 parts of nano titanium dioxide, 6 parts of toughening agent, 2 parts of lubricant, 2 parts of ultraviolet absorber, and 2 parts of antistatic agent; The toughening agent is acrylonitrile-butadiene-styrene copolymer, the lubricant is pentaerythritol stearate, the ultraviolet absorber is 2-hydroxy-4-n-octyloxybenzophenone, and the antistatic agent is isocyanate; A method for preparing PC material based on waste PC car lamps, comprising the following steps: (1) Waste PC particles, nano titanium dioxide, toughening agent, lubricant, ultraviolet absorber and antistatic agent are mixed to obtain a blend, and the mixture is mixed for 30 minutes under nitrogen protection at a mixing temperature of 80°C; (2) Under nitrogen protection, the blend obtained in step (1) is melted and extruded into granules through a twin-screw extruder at a temperature of 250° C., a screw speed of 450-500 rpm, and a vacuum degree of 0.1-0.04 MPa to obtain the obtained product.

[0025] The properties of the PC materials based on waste PC car lamps prepared in Examples 1-3 and Comparative Examples 1-3 were tested. The test method is as follows. The test results are shown in Table 1 below.

[0026] Test sample preparation method: The PC material particles based on waste PC car lamps prepared in the above Examples 1-3 and Comparative Examples 1-3 are added into an injection molding machine for melting and cooling to form, wherein the temperature of the injection molding machine is 270-290°C, and the specific size of the sample is determined according to the requirements of the following test methods.

[0027] (1) Tensile properties test The tensile strength of the specimen is tested in accordance with GB / T 1040.2-2022 "Determination of tensile properties of plastics Part 2: Test conditions for molded and extruded plastics".

[0028] (2) Impact resistance test The impact resistance of the test specimens was tested according to GB / T 1843 “Determination of Izod Impact Strength of Plastics”.

[0029] (3) Wear resistance test The wear resistance of the specimens was tested according to GB / T 5478-2008 "Test Method for Rolling Wear of Plastics". The test was conducted using a TABER wear tester under the test conditions of a load of 500g and a rotation speed of 60r / min. The specimens were observed every 25 turns, and the number of frictions when wear, scratches or discoloration appeared was recorded.

[0030] (4) Surface hardness test The hardness of the test specimens was tested in accordance with GB / T 2411-2008 "Determination of indentation hardness (Shore hardness) of plastics and hard rubber using a hardness tester".

[0031] (5) Heat resistance test The heat deformation temperature of the test specimen is tested according to GB / T 1633-2000 "Determination of Vicat softening temperature (VST) of soft plastics".

[0032] (6) Antioxidant performance test According to the method described in GB / T16422.2-2022 "Plastics Laboratory Light Source Exposure Test Method Part 2: Xenon Arc Lamp", place it in a xenon lamp exposure yellowing test chamber for irradiation, and select exposure cycle 1 with temperature controlled by a black standard thermometer (BST) for irradiation; then test the yellowness index of the sample after irradiation with a xenon arc lamp according to HG / T 3862-2006 "Plastic Yellowness Index Test Method" to obtain its yellowing index △YI.

[0033] Table 1 Performance test of various PC materials sample Tensile strength (MPa) <![CDATA[Impact strength (KJ.m -2 )]]> Wear times Rockwell hardness Heat deformation temperature (℃) Yellowing Index △YI Example 1 83 25 1660 R132 185 0.12 Example 2 81 24 1630 R130 187 0.13 Example 3 84 25 1655 R129 188 0.13 Comparative Example 1 78 22 1610 R130 172 0.37 Comparative Example 2 77 21 1595 R126 141 0.38 Comparative Example 3 66 13 1605 R124 136 0.51 It can be seen from the data in Table 1 that compared with Comparative Examples 1-3, the PC materials based on waste PC headlights prepared in Examples 1-3 have significantly improved properties such as tensile strength, impact strength, heat deformation temperature and yellowing index. In addition, the PC materials of Examples 1-3 are also superior to the materials prepared in the comparative examples in terms of wear resistance and hardness. These improvements are mainly attributed to the introduction of modified silane coupling agents, which not only significantly enhance the high temperature resistance and oxidation resistance of PC materials, but also improve the compatibility between nano-titanium dioxide and PC matrix, and enhance the interfacial bonding force between nano-titanium dioxide and organic matrix, which helps to improve the overall performance of PC materials. At the same time, the synergistic effect between the components also jointly promotes the improvement of the tensile properties, oxidation resistance, wear resistance and hardness of PC materials.

[0034] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0035] Although the embodiments of the present application have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A PC material based on waste PC car lights, characterized in that: The raw materials include the following parts by weight: 80-90 parts of waste PC particles, 5-10 parts of nano titanium dioxide, 1-5 parts of modified silane coupling agent, 5-8 parts of toughening agent, 1-5 parts of lubricant, 1-3 parts of ultraviolet absorber, and 1-3 parts of antistatic agent. The preparation method of the modified silane coupling agent is as follows: Step S1, adding silane coupling agent KH-560, 3-fluoro-5-(trifluoromethyl)phenylacetic acid and chromium isooctanoate to toluene at 70-80° C. with stirring, reacting for 1-3 hours, cooling to room temperature, and purifying to obtain an intermediate, the structural formula of the intermediate is: ； Step S2, adding the intermediate obtained in step S1, aluminum chloride and dihydrocaffeic acid to N,N-dimethylformamide at 80-100° C. with stirring, reacting for 2-4 hours, cooling to room temperature, and purifying to obtain a modified silane coupling agent, the structural formula of the modified silane coupling agent is: 。 2. The PC material based on waste PC car lamps according to claim 1 is characterized in that: The molar ratio of the silane coupling agent KH-560, 3-fluoro-5-(trifluoromethyl)phenylacetic acid and chromium isooctanoate in step S1 is 10:4-6:0.05-0.08, and the amount of the silane coupling agent KH-560 added to toluene is 0.06-0.08 g / mL.

3. The PC material based on waste PC car lamps according to claim 1 is characterized in that: The molar ratio of the intermediate, aluminum chloride and dihydrocaffeic acid in step S2 is 1:0.05-0.06:0.8-0.9, and the amount of dihydrocaffeic acid added to N,N-dimethylformamide is 0.03-0.05 g / mL.

4. The PC material based on waste PC car lamps according to claim 1 is characterized in that: The toughening agent is one or more of methyl methacrylate-butadiene-styrene copolymer, acrylonitrile-butadiene-styrene copolymer, POE plastic, and GMA plastic.

5. The PC material based on waste PC car lamps according to claim 1 is characterized in that: The lubricant is one or more of stearamide, calcium stearate, zinc stearate, and pentaerythritol stearate.

6. The PC material based on waste PC car lamps according to claim 1, characterized in that: The ultraviolet absorber is one or more of 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-n-octyloxybenzophenone, and pentaerythritol tetrakis (2-cyano-3,3-diphenylacrylate).

7. The PC material based on waste PC car lamps according to claim 1, characterized in that: The antistatic agent is one or more of dibenzoyl peroxide, diisopropylbenzene peroxide, isocyanate and sodium dodecylbenzene sulfonate.

8. The method for preparing PC material based on waste PC car lamps according to any one of claims 1 to 7, characterized in that: The following steps are involved: (1) Blending waste PC particles, nano titanium dioxide, modified silane coupling agent, toughening agent, lubricant, ultraviolet absorber and antistatic agent under nitrogen protection to obtain a blend; (2) Under nitrogen protection, the blend obtained in step (1) is melted and extruded into granules by a screw extruder to obtain the obtained product.

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