An aging-resistant plastic composite material and its preparation method

Abstract

This invention relates to the field of plastic composite materials technology, and discloses an aging-resistant plastic composite material and its preparation method, specifically including: synthesizing an aging-resistant silane coupling agent and an aldehyde-modified aging-resistant silane coupling agent; based on the silanol-hydroxyl condensation reaction mechanism, jointly modifying the aging-resistant silane coupling agent and the aldehyde-modified aging-resistant silane coupling agent onto the surface of rutile TiO2 nanoparticles; then, based on the aldehyde-amino Schiff base reaction mechanism, combining the TiO2 nanoparticles with aldehyde functional groups on the surface with amino-functionalized kaolin to obtain an aging-resistant modifier; based on the π-π stacking effect, combining the aging-resistant modifier with SBR rubber, and obtaining aging-resistant SBR rubber particles through a crushing process; and compounding the aging-resistant SBR rubber particles with a polyurethane adhesive to obtain an aging-resistant plastic composite material, which exhibits excellent resistance to photo-oxidative aging and thermo-oxidative aging.

Description

Technical Field

[0001] This invention relates to the field of plastic composite materials technology, specifically to an aging-resistant plastic composite material and its preparation method. Background Technology

[0002] Plastic composite materials made from rubber granules and polyurethane adhesives combine the elasticity and abrasion resistance of rubber with the bonding strength of polyurethane. They are well-balanced elastic materials suitable for applications requiring high elasticity, slip resistance, shock absorption, and abrasion resistance. Among these, SBR (styrene-butadiene rubber) granules are increasingly becoming an important choice in plastic composite materials due to their large production volume (global annual capacity exceeding 5 million tons), low price (only 60%-70% of natural rubber and 50%-60% of EPDM rubber), good abrasion resistance, and moderate elasticity.

[0003] Studies have found that SBR rubber has limited aging resistance. Its molecular chains contain numerous unsaturated double bonds, making it susceptible to attack from oxygen, ozone, and ultraviolet radiation, leading to oxidative degradation (molecular chain breakage) or cross-linking (excessive molecular chain connection). This results in a gradual decline in material properties, causing plastic products made from it to exhibit discoloration, whitening, softening and stickiness, hardening and brittleness, and surface cracking. Therefore, researching aging-resistant SBR rubber has significant application value for plastic composite products. Summary of the Invention

[0004] This invention provides an aging-resistant plastic composite material. By introducing aging-resistant components into SBR rubber through chemical modification, its anti-aging ability is improved. This SBR rubber is then used as elastic particles and compounded with polyurethane adhesive to obtain a high-performance plastic composite material.

[0005] A method for preparing an aging-resistant plastic composite material includes the following steps:

[0006] Step 1: Synthesize aging-resistant silane coupling agents and aldehyde-modified aging-resistant silane coupling agents;

[0007] Step 2: Based on the silanol-hydroxyl condensation reaction mechanism, aging-resistant silane coupling agent and aldehyde-modified aging-resistant silane coupling agent are jointly modified onto the surface of rutile TiO2 nanoparticles. Then, based on the aldehyde-amino Schiff base reaction mechanism, TiO2 nanoparticles with aldehyde functional groups on the surface are combined with amino-functionalized kaolin to prepare an aging-resistant modification reagent.

[0008] Step 3: Based on the π-π stacking effect, the aging-resistant modifier is compounded with SBR rubber, and aging-resistant SBR rubber particles are obtained through a crushing process. The aging-resistant SBR rubber particles are then compounded with polyurethane adhesive to obtain an aging-resistant plastic composite material.

[0009] Preferably, the preparation method of the aging-resistant silane coupling agent is as follows:

[0010] Using 2,2,6,6-tetramethylpiperidineamine as a starting material, a nucleophilic substitution reaction is carried out between the -NH2 functional group of 1 molar equivalent of 2,2,6,6-tetramethylpiperidineamine and the chlorine functional group of 0.91-0.99 molar equivalents of 3-chloropropyltrimethoxysilane to generate a secondary amine monomer.

[0011] Under the action of an activator, an amidation reaction is catalyzed by an organic base catalyst on the -NH- functional group of 1 molar equivalent of secondary amine monomer and the carboxyl functional group of 0.91-0.99 molar equivalent of 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid to generate an aging-resistant silane coupling agent.

[0012] Preferably, the aldehyde-based aging-resistant silane coupling agent is prepared by: a nucleophilic substitution reaction between the -NH- functional group of 1 molar equivalent of a secondary amine monomer and the chlorine functional group of 0.91-0.99 molar equivalent of 5-chloropentanal to generate the aldehyde-based aging-resistant silane coupling agent.

[0013] Preferably, the activator is one of N,N'-dicyclohexylcarbodiimide, 1-hydroxybenzotriazole, and N-hydroxy-7-azabenzotriazole.

[0014] Preferably, the organic base catalyst is one of pyridine, triethylamine, tributylamine, and imidazole.

[0015] Preferably, the formulation of the aging-resistant modifying agent is: 4-8 parts by weight of amino-functionalized kaolin, 1-3 parts by weight of rutile TiO2 nanoparticles, 0.5-1.5 parts by weight of aging-resistant silane coupling agent and 0.5-1.5 parts by weight of aldehyde-modified aging-resistant silane coupling agent.

[0016] Preferably, the preparation method of the amino-functionalized kaolin is as follows: kaolin is subjected to composite modification treatment using 3-aminopropyltrimethoxysilane and trimethoxy(2-phenylethyl)silane. The silanol functional groups obtained by the hydrolysis reaction of the hydrolytic functional groups of 3-aminopropyltrimethoxysilane and trimethoxy(2-phenylethyl)silane undergo a dehydration condensation reaction with the hydroxyl functional groups on the surface of hydrophilic kaolin to prepare amino-functionalized kaolin.

[0017] Preferably, the amount of aging-resistant modifying agent in the aging-resistant SBR rubber particles is 10-20 wt% of the SBR rubber.

[0018] The mass ratio of polyurethane adhesive to aging-resistant SBR rubber particles in the aging-resistant plastic composite material prepared by the above method is 1:(4-6).

[0019] Beneficial effects:

[0020] This invention uses hindered amine derivatives of organic light stabilizers (2,2,6,6-tetramethylpiperidinamine), hindered phenol derivatives of organic antioxidants (3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid), silane coupling agent 3-chloropropyltrimethoxysilane, and 5-chloropentanal, which provides a linking group (aldehyde group), as raw materials to synthesize aging-resistant silane coupling agents and aldehyde-based aging-resistant silane coupling agents based on nucleophilic substitution and amidation reaction mechanisms.

[0021] An aldehyde-functionalized organic-inorganic hybrid anti-aging modifier was prepared by composite modification of inorganic light stabilizer rutile TiO2 nanoparticles with anti-aging silane coupling agent and aldehyde-based anti-aging silane coupling agent.

[0022] Based on the aldehyde-amino Schiff base reaction mechanism, an aldehyde-functionalized organic-inorganic hybrid anti-aging modifier was modified onto the surface of an amino-functionalized kaolin support with a large specific surface area and porous structure (prepared by composite modification of kaolin with 3-aminopropyltrimethoxysilane and trimethoxy(2-phenylethyl)silane) to prepare a supported anti-aging modifier with multiple active sites. Based on the π-π stacking effect between phenyl groups, the supported anti-aging modifier was used to perform composite modification on SBR rubber to prepare anti-aging SBR rubber.

[0023] The experimental results show that the SBR rubber prepared by the self-developed load-type aging-resistant modifier of this invention not only significantly improves the mechanical properties before aging compared with conventional SBR rubber, but also significantly improves the tensile strength after thermo-oxidative aging and photo-oxidative aging, exhibiting excellent aging resistance.

[0024] An aging-resistant plastic composite material is prepared by combining aging-resistant SBR rubber particles obtained from crushing aging-resistant SBR rubber with a polyurethane adhesive. Detailed Implementation

[0025] Experimental Example 1:

[0026] Synthesizing aging-resistant silane coupling agents, including but not limited to the following reaction formulas and reaction steps:

[0027]

[0028] The synthesis process of the aging-resistant silane coupling agent is as follows:

[0029] Procedure 1: Using 2,2,6,6-tetramethylpiperidinamine as a starting material, a nucleophilic substitution reaction was carried out between the -NH2 functional group of 1 molar equivalent of 2,2,6,6-tetramethylpiperidinamine and the chlorine functional group of 0.94 molar equivalent of 3-chloropropyltrimethoxysilane to generate a secondary amine monomer. The specific synthetic steps are as follows: 3.2 g of 2,2,6,6-tetramethylpiperidinamine and 30 mL of N,N-dimethylformamide were added to a three-necked flask and stirred at room temperature until completely dissolved. Then, 3.6 mL of 3-chloropropyltrimethoxysilane and 0.8 mL of triethylamine were slowly added dropwise to the three-necked flask. The mixture was heated to 70 °C and stirred for 5 h. After cooling to room temperature, the mixture was evaporated under reduced pressure and dried to obtain the secondary amine monomer.

[0030] Process 2: Under the action of an activator, an amidation reaction is catalyzed by an organic base catalyst on the -NH- functional group of 1 molar equivalent of secondary amine monomer and the carboxyl functional group of 0.97 molar equivalent of 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid to generate an aging-resistant silane coupling agent. The specific synthesis steps are as follows: 3.2 g of secondary amine monomer, 2.8 g of 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid, 1.0 g of triethylamine and 50 mL of N,N-dimethylformamide are added to a three-necked flask and stirred at room temperature until completely dissolved. Then, 10 mL of N,N'-dicyclohexylcarbodiimide solution containing 1.5 g of N,N'-dimethylformamide is added to the three-necked flask, the temperature is raised to 80 °C and stirred for 6 h, cooled to room temperature, rotary evaporated under reduced pressure, washed with dichloromethane, and dried to obtain the aging-resistant silane coupling agent.

[0031] The activator can be selected from N,N'-dicyclohexylcarbodiimide, 1-hydroxybenzotriazole, or N-hydroxy-7-azabenzotriazole. In this experimental example, N,N'-dicyclohexylcarbodiimide was selected. The organic base catalyst can be selected from pyridine, triethylamine, tributylamine, or imidazole. In this experimental example, triethylamine was selected.

[0032] The 1H NMR characterization of the aging-resistant silane coupling agent is as follows: 1 H NMR (400MHz, DMSO-d6) δ: 0.49-0.55(t, 2H), 1.24(s, 6H), 1.28(s, 6H), 1.37(s, 18H), 1.54-1.72(m, 6H), 2.00(s, 1H), 2.69-2.75 (t, 2H), 2.88-2.93 (t, 2H), 3.29-3.34 (t, 2H), 3.58 (s, 9H), 4.74-4.82 (m, 1H), 6.51 (s, 1H), 6.91 (s, 2H).

[0033] Experimental Example 2:

[0034] Synthesizing aldehyde-modified, age-resistant silane coupling agents, including but not limited to the following reaction formulas and reaction steps:

[0035]

[0036] The synthesis process of aldehyde-modified aging-resistant silane coupling agents is as follows:

[0037] Process 1: Synthesis of secondary amine monomers, the synthesis method and steps of which are the same as those in the synthesis experiment of secondary amine monomers in Experiment Example 1;

[0038] Process 2: A nucleophilic substitution reaction occurs between the -NH- functional group of 1 molar equivalent of the secondary amine monomer and the chlorine functional group of 0.95 molar equivalent of 5-chloropentanal to generate an aldehyde-based aging-resistant silane coupling agent. The specific synthesis steps are as follows: 3.2 g of the secondary amine monomer and 30 mL of N,N-dimethylformamide are added to a three-necked flask and stirred at room temperature until completely dissolved. Then, 10 mL of N,N-dimethylformamide solution containing 1.2 g of 5-chloropentanal and 1.0 mL of triethylamine are slowly added dropwise to the three-necked flask. The mixture is heated to 70 °C and stirred for 5 h. After cooling to room temperature, the mixture is evaporated under reduced pressure and dried to obtain the aldehyde-based aging-resistant silane coupling agent.

[0039] The 1H NMR characterization of the aldehyde-modified, aging-resistant silane coupling agent is as follows: 1 H NMR (400MHz, DMSO-d6) δ: 0.50-0.56 (t, 2H), 1.22 (s, 6H), 1.28 (s, 6H), 1.41-1.59 (m, 10H), 2.01 (s, 1H), 2.4 0-2.46 (m, 2H), 2.59-2.67 (m, 1H), 2.75-2.79 (t, 4H), 3.60 (s, 9H), 9.17-9.20 (t, 1H).

[0040] Example 1:

[0041] The preparation process of the supported aging-resistant modifier is as follows:

[0042] (1) Preparation of aldehyde-functionalized organic-inorganic hybrid anti-aging modifier: Rutile TiO2 nanoparticles were modified by using anti-aging silane coupling agent and aldehyde-functionalized anti-aging silane coupling agent. The silanol functional groups obtained by the hydrolysis reaction of the hydrolytic functional groups of the anti-aging silane coupling agent and the aldehyde-functionalized anti-aging silane coupling agent underwent a dehydration condensation reaction with the hydroxyl functional groups on the surface of hydrophilic rutile TiO2 nanoparticles to prepare the aldehyde-functionalized organic-inorganic hybrid anti-aging modifier. The specific preparation steps are as follows: 5g of aldehyde-functionalized organic-inorganic hybrid anti-aging modifier with an average particle size of 2 Hydrophilic rutile TiO2 nanoparticles (0 nm), 5 mL of deionized water, and 45 mL of ethanol were added to a three-necked flask and ultrasonically dispersed for 1 h. Then, 30 mL of an ethanol-water solution containing 2 g of aging-resistant silane coupling agent and 2 g of aldehyde-functionalized aging-resistant silane coupling agent (ethanol to deionized water volume ratio of 5:1) was added dropwise to the three-necked flask. After the addition was complete, 2 drops of glacial acetic acid were added, the temperature was raised to 60 °C, and the reaction was stirred for 4 h. After cooling to room temperature, the mixture was centrifuged, washed repeatedly with deionized water, centrifuged, and dried to obtain an aldehyde-functionalized organic-inorganic hybrid aging-resistant modifier.

[0043] (2) Preparation of amino-functionalized kaolin: Kaolin was modified by 3-aminopropyltrimethoxysilane and trimethoxy(2-phenylethyl)silane. The silanol functional groups obtained by the hydrolysis reaction of the hydrolytic functional groups of 3-aminopropyltrimethoxysilane and trimethoxy(2-phenylethyl)silane underwent a dehydration condensation reaction with the hydroxyl functional groups on the surface of hydrophilic kaolin to prepare an amino-functionalized kaolin carrier. The specific preparation steps are as follows: 5g of hydrophilic kaolin with an average particle size of 3000 mesh was used. Kaolin powder, 5 mL of deionized water and 45 mL of ethanol were added to a three-necked flask and ultrasonically dispersed for 1 h. Then, 20 mL of an ethanol-water solution containing 1 g of 3-aminopropyltrimethoxysilane and 1 g of trimethoxy(2-phenylethyl)silane (ethanol to deionized water volume ratio of 5:1) was added dropwise to the three-necked flask. After the addition was complete, 2 drops of glacial acetic acid were added, the temperature was raised to 60 °C and stirred for 4 h, the mixture was cooled to room temperature and centrifuged. After repeated washing and centrifugation with deionized water, the amino-functionalized kaolin carrier was obtained after drying.

[0044] (3) Preparation of supported aging-resistant modifier: The aldehyde functional group on the surface of the aldehyde-functionalized organic-inorganic hybrid aging-resistant modifier reacts with the amino functional group on the surface of the amino-functionalized kaolin carrier to modify the surface of the organic-inorganic hybrid aging-resistant modifier, and the supported aging-resistant modifier is prepared. The specific preparation steps are as follows: 5g of amino-functionalized kaolin carrier and 50mL of ethanol are added to a three-necked flask, stirred at room temperature for 30min, and ultrasonically dispersed for 1h. Then, 30mL of ethanol solution containing 3g of aldehyde-functionalized organic-inorganic hybrid aging-resistant modifier is added to the three-necked flask, heated to 70℃ and stirred for 10h, cooled to room temperature, centrifuged, washed repeatedly with deionized water, centrifuged, and dried to obtain the supported aging-resistant modifier.

[0045] Example 2:

[0046] Preparation of aging-resistant SBR rubber I: The phenyl groups in the supported aging-resistant modifier undergo π-π stacking with the phenyl groups on the side chains of the SBR rubber molecules, achieving composite modification of the SBR rubber by the supported aging-resistant modifier. The resulting aging-resistant SBR rubber I has the following formulation: 10 parts by weight of SBR latex (grade 1502), 1 part by weight of supported aging-resistant modifier, 0.1 parts by weight of stearic acid, 0.3 parts by weight of vulcanization accelerator, and 0.2 parts by weight of sulfur. The specific preparation steps are as follows: 10g of SBR latex is added to 10mL of a deionized water solution containing 1g of supported aging-resistant modifier, and stirred at room temperature for 2h to form the supported aging-resistant modified... A mixed emulsion of aging modifier / SBR was slowly added to a 1wt% calcium chloride aqueous solution to form a loaded aging modifier / SBR flocculent aggregate. After shearing, rinsing, and drying, a loaded aging modifier / SBR predispersed rubber was obtained. The predispersed rubber was then plasticized on a two-roll mill for 2 minutes, and 0.1g of stearic acid was added and mixed for 5 minutes. After sheeting and cooling, 0.3g of vulcanization accelerator (model CZ) and 0.2g of sulfur were added again on a two-roll mill. The mixture was thoroughly mixed through a small-pitch thin pass and a triangular folding process. After sheeting and cooling, the mixture was vulcanized at 150℃ and 10MPa for 25 minutes to obtain aging-resistant SBR rubber I.

[0047] Example 3:

[0048] The only difference between the aging-resistant SBR rubber II and the aging-resistant SBR rubber I is that the amount of the loaded aging-resistant modifier is 1.5 parts by weight.

[0049] Example 4:

[0050] The only difference between the aging-resistant SBR rubber III and the aging-resistant SBR rubber I is that the amount of the supported aging-resistant modifier is 2 parts by weight.

[0051] Example 5:

[0052] The preparation of aging-resistant plastic composite materials includes the following steps:

[0053] Step 1: Use a twin-shaft shear crusher and a hammer mill in sequence to crush the aging-resistant SBR rubber into aging-resistant SBR rubber particles with a diameter of 3mm.

[0054] Step 2: Mix the polyurethane adhesive and the aging-resistant SBR rubber granules at a mass ratio of 1:5 at 50°C, pour the mixture into a mold with a thickness of 13mm, and press it down with a pressure plate. After leaving it at room temperature for 24 hours, demold it to obtain the aging-resistant plastic composite material.

[0055] Among them, the aging-resistant SBR rubber is one of the three types: aging-resistant SBR rubber I, aging-resistant SBR rubber II, and aging-resistant SBR rubber III.

[0056] Comparative example:

[0057] The conventional SBR rubber is prepared by the following formula: 10 parts by weight of SBR latex (grade 1502), 0.1 parts by weight of stearic acid, 0.3 parts by weight of vulcanization accelerator and 0.2 parts by weight of sulfur. The preparation method is the same as that of the aging-resistant SBR rubber I.

[0058] Performance testing:

[0059] The properties of aging-resistant SBR rubber were tested, as follows:

[0060] (1) Mechanical property test: The tensile strength of the sample was tested by a universal tensile testing machine in accordance with GB / T 528-2009 "Determination of tensile stress-strain properties of vulcanized rubber or thermoplastic rubber". The sample was cut into dumbbell-shaped strips by a pneumatic slicer. The tensile area of ​​the sample was 26mm×6mm and the tensile rate was 500mm / min.

[0061] (2) Mechanical property test after 10 days of thermo-oxidative aging: First, the dumbbell-shaped sample of 26mm×6mm was placed in a forced ventilation thermo-aging test chamber for accelerated aging. It was treated at 100℃ for 10 days with an air exchange rate of 50 times / h. Then, the tensile strength of the sample was tested by a universal tensile testing machine according to GB / T 528-2009 "Determination of tensile stress-strain properties of vulcanized rubber or thermoplastic rubber" standard. The tensile rate was 500mm / min.

[0062] (3) Mechanical property test after 10 days of photo-oxidation aging: First, the dumbbell-shaped sample of 26mm×6mm was placed in the accelerated photo-aging test chamber and treated under ultraviolet lamp for 10 days. There were two ultraviolet lamps, both of which were 36W. The distance between the two lamps was 15cm, and the distance between the sample and the lamps was 14cm. Then, the tensile strength of the sample was tested by a universal tensile testing machine according to GB / T 528-2009 "Determination of tensile stress-strain properties of vulcanized rubber or thermoplastic rubber". The tensile rate was 500mm / min.

[0063] The results of the above performance experiments are shown in Table 1;

[0064] Table 1. Performance test results of aging-resistant SBR rubber

[0065]

[0066] Note: Tensile strength retention rate (%) = (Tensile strength after aging / Tensile strength before aging) × 100%;

[0067] Analysis of the performance test results in Table 1 shows that the SBR rubber prepared by the self-developed load-type aging-resistant modifier of this invention not only significantly improves the mechanical properties before aging compared with conventional SBR rubber, but also significantly improves the tensile strength after thermo-oxidative aging and photo-oxidative aging, exhibiting excellent aging resistance.

Claims

1. A method for preparing an aging-resistant plastic composite material, characterized in that, Includes the following steps: Step 1: Synthesize aging-resistant silane coupling agents and aldehyde-modified aging-resistant silane coupling agents; The chemical structural formula of the aging-resistant silane coupling agent is: ； The chemical structural formula of the aldehyde-based aging-resistant silane coupling agent is as follows: ； Step 2: Based on the silanol-hydroxyl condensation reaction mechanism, aging-resistant silane coupling agent and aldehyde-modified aging-resistant silane coupling agent are jointly modified onto the surface of rutile TiO2 nanoparticles. Then, based on the aldehyde-amino Schiff base reaction mechanism, TiO2 nanoparticles with aldehyde functional groups on the surface are combined with amino-functionalized kaolin to prepare an aging-resistant modification reagent. Step 3: Based on the π-π stacking effect, the aging-resistant modifier is compounded with SBR rubber, and aging-resistant SBR rubber particles are obtained through a crushing process. The aging-resistant SBR rubber particles are then compounded with polyurethane adhesive to obtain an aging-resistant plastic composite material.

2. The method for preparing an aging-resistant plastic composite material according to claim 1, characterized in that, The preparation method of the aging-resistant silane coupling agent is as follows: Using 2,2,6,6-tetramethylpiperidineamine as a starting material, a nucleophilic substitution reaction is carried out between the -NH2 functional group of 1 molar equivalent of 2,2,6,6-tetramethylpiperidineamine and the chlorine functional group of 0.91-0.99 molar equivalents of 3-chloropropyltrimethoxysilane to generate a secondary amine monomer. Under the action of an activator, an amidation reaction is catalyzed by an organic base catalyst on the -NH- functional group of 1 molar equivalent of secondary amine monomer and the carboxyl functional group of 0.91-0.99 molar equivalent of 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid to generate an aging-resistant silane coupling agent.

3. The method for preparing an aging-resistant plastic composite material according to claim 2, characterized in that, The aldehyde-based aging-resistant silane coupling agent is prepared by a nucleophilic substitution reaction between the -NH- functional group of a 1 molar equivalent secondary amine monomer and the chlorine functional group of 0.91-0.99 molar equivalent 5-chloropentanal to generate the aldehyde-based aging-resistant silane coupling agent.

4. The method for preparing an aging-resistant plastic composite material according to claim 2, characterized in that, The activator is one of N,N'-dicyclohexylcarbodiimide, 1-hydroxybenzotriazole, and N-hydroxy-7-azabenzotriazole.

5. The method for preparing an aging-resistant plastic composite material according to claim 2, characterized in that, The organic base catalyst is one of pyridine, triethylamine, tributylamine, and imidazole.

6. The method for preparing an aging-resistant plastic composite material according to claim 1, characterized in that, The formulation of the aging-resistant modification reagent is as follows: 4-8 parts by weight of amino-functionalized kaolin, 1-3 parts by weight of rutile TiO2 nanoparticles, 0.5-1.5 parts by weight of aging-resistant silane coupling agent and 0.5-1.5 parts by weight of aldehyde-modified aging-resistant silane coupling agent.

7. The method for preparing an aging-resistant plastic composite material according to claim 6, characterized in that, The preparation method of the amino-functionalized kaolin is as follows: kaolin is subjected to composite modification treatment using 3-aminopropyltrimethoxysilane and trimethoxy(2-phenylethyl)silane. The silanol functional groups obtained by the hydrolysis reaction of the hydrolytic functional groups of 3-aminopropyltrimethoxysilane and trimethoxy(2-phenylethyl)silane undergo a dehydration condensation reaction with the hydroxyl functional groups on the surface of hydrophilic kaolin to prepare amino-functionalized kaolin.

8. The method for preparing an aging-resistant plastic composite material according to claim 1, characterized in that, The amount of aging-resistant modifying agent in the aging-resistant SBR rubber particles is 10-20 wt% of the SBR rubber.

9. An aging-resistant plastic composite material prepared by the method according to any one of claims 1-8, characterized in that, The mass ratio of polyurethane adhesive to aging-resistant SBR rubber particles in the aging-resistant plastic composite material is 1:(4-6).

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