Composite plastic material for outdoor runway and preparation method thereof

Abstract

The invention discloses a composite plastic material for outdoor runways and a preparation method thereof, and belongs to the technical field of high polymer materials. The preparation method comprises the following steps: stirring polybutylene terephthalate and hydroxyl-terminated polybutadiene, heating to 120 DEG C, dehydrating for 2 hours, cooling to 60 DEG C, adding diisocyanate, reacting at 80 DEG C for 2 hours, adding a chain extender and an auxiliary agent, pouring into a mold, vulcanizing, curing and demolding to obtain a polyurethane elastomer; mixing a polyurethane elastomer, the modified filler, butadiene styrene rubber, natural rubber, ethylene propylene diene monomer, a softening agent and a pigment, performing open milling and calendaring, mixing with a vulcanizing agent and an accelerant, and performing vulcanization and calendaring to obtain the composite plastic material. The auxiliary agent, the modified filler and the ethylene propylene diene monomer have chemical action in pairs, so that a hybrid cross-linked network structure is formed, the auxiliary agent and the modified filler stably exist in the network structure, and the composite plastic material is endowed with efficient and lasting thermo-oxidative aging resistance, ultraviolet aging resistance, wear resistance, acid and alkali resistance and the like.

Description

Technical Field

[0001] The present invention belongs to the technical field of polymer materials, and in particular, relates to a composite plastic material for an outdoor running track and a preparation method thereof. Background Art

[0002] Outdoor running tracks are generally plastic running tracks, which are composed of polyurethane elastomers, natural rubber, synthetic rubber, pigments, additives, fillers, etc. The plastic running track has the characteristics of good flatness, high compressive strength, appropriate hardness and elasticity, and stable physical properties.

[0003] However, outdoor running tracks are in an open-air environment and are exposed to sunlight and high temperatures for a long time. Therefore, outdoor running tracks are extremely susceptible to ultraviolet rays and high temperatures. Properties such as tensile strength will decrease, and the service life will be greatly shortened. It may also cause safety problems. Therefore, it is extremely important to improve and maintain the plastic track's anti-UV aging performance and high-temperature aging performance. Summary of the invention

[0004] The purpose of the present invention is to overcome the defects of the prior art and provide a composite plastic material for an outdoor runway and a preparation method thereof.

[0005] The purpose of the present invention can be achieved through the following technical solutions: A method for preparing a composite plastic material for an outdoor runway comprises the following steps: (1) Stirring polybutylene terephthalate and terminal hydroxyl polybutadiene to 120°C, dehydrating for 2 hours, cooling to 60°C, adding diisocyanate, stirring and heating to 80°C for reaction for 2 hours, then adding chain extender and auxiliary agent in sequence, stirring and pouring into a mold, vulcanizing, aging, and demolding to obtain a polyurethane elastomer; (2) The polyurethane elastomer, modified filler, styrene-butadiene rubber, natural rubber, EPDM rubber, softener and colorant are mixed, followed by open refining and calendering, and then mixed with a vulcanizing agent and an accelerator and vulcanized, and finally calendered to obtain a composite plastic material for an outdoor runway.

[0006] Furthermore, the polyurethane elastomer in step (1) comprises the following raw materials in parts by weight: 20-40 parts of polybutylene terephthalate, 40-50 parts of terminal hydroxyl polybutadiene, 30-50 parts of diisocyanate, 2-4 parts of chain extender, and 0.8-1.5 parts of auxiliary agent.

[0007] Furthermore, the diisocyanate is one or more of toluene diisocyanate, isophorone diisocyanate, and hexamethylene diisocyanate.

[0008] Furthermore, the chain extender is one or both of ethylene glycol and 1,4-butanediol.

[0009] Furthermore, the auxiliary agent is prepared by the following steps: S1. Add cyanuric chloride, N-methylallylamine and toluene to a dry three-necked flask under nitrogen protection, stir until completely dissolved, then slowly add 20wt% sodium bicarbonate solution, react for 6h in an ice water bath (0°C), add deionized water after the reaction, shake, stand and separate, separate the aqueous phase and measure the pH until the pH of the aqueous phase is neutral, then take the organic phase and dry it with anhydrous magnesium sulfate, filter, and distill the filtrate under reduced pressure to obtain intermediate 1; the amount ratio of cyanuric chloride to N-methylallylamine is 18.5g:10.5mL; Under alkaline conditions, the molar ratio of cyanuric chloride and N-methylallylamine is controlled to be 1:1.05-1.1, then -Cl of cyanuric chloride and -NH- of N-methylallylamine undergo nucleophilic substitution reaction, and the reaction process is as follows: S2. In a dry brown three-necked flask under nitrogen protection, resorcinol, anhydrous aluminum chloride and dimethyl sulfoxide were added in sequence, stirred evenly and then intermediate 1 was added, and then the temperature was raised to 120°C for reaction for 10 hours. After the reaction, the reaction mixture was slowly poured into ice water to precipitate solids, which were filtered and recrystallized with 80% methanol aqueous solution to obtain intermediate 2; the dosage ratio of intermediate 1, resorcinol, anhydrous aluminum chloride and dimethyl sulfoxide was 20.8 g:10.5 mL:3.1 g:220 mL; The molar ratio of intermediate 1 to resorcinol is controlled to be 1:1.2-1.3, and intermediate 1 and resorcinol undergo Friedel-Crafts acylation reaction under the catalysis of anhydrous aluminum chloride. The reaction process is as follows: S3. Under nitrogen protection, add intermediate 2 and dimethyl sulfoxide into a dry three-necked flask, stir until completely dissolved, heat to 50°C and slowly add 3,5-di(tert-butyl)-4-hydroxy-benzenepropionic acid and 3-hydroxy-2,2-bis(hydroxymethyl)propyl ester, stir and react for 3 hours. During the whole reaction, adjust the pH value of the system to 7 with 10wt% sodium carbonate solution. After the reaction, add deionized water and shake, let stand to separate, take the organic phase, dry it with anhydrous magnesium sulfate, filter it, and distill the filtrate under reduced pressure to obtain an auxiliary agent; the amount ratio of 3,5-di(tert-butyl)-4-hydroxy-benzenepropionic acid, 3-hydroxy-2,2-bis(hydroxymethyl)propyl ester and intermediate 2 is 36.2g:24.9g.

[0010] Under heating conditions, the molar ratio of 3,5-di(tert-butyl)-4-hydroxy-benzenepropionic acid, 3-hydroxy-2,2-bis(hydroxymethyl)propyl ester and intermediate 2 is controlled to be 1.05-1.1:1, then 3,5-di(tert-butyl)-4-hydroxy-benzenepropionic acid, 3-hydroxy-2,2-bis(hydroxymethyl)propyl ester -OH and -Cl of intermediate 2 undergo substitution reaction, and the reaction process is as follows: The hindered phenol structure in the additive mainly delays the aging process by capturing free radicals; the triazine structure in the additive has a chelate ring composed of intramolecular hydrogen bonds. After absorbing ultraviolet light, the intramolecular hydrogen bonds are destroyed to form unstable high-energy ionic compounds, which then release excess energy to restore the original low-energy stable state, thereby absorbing ultraviolet light. It can strongly absorb ultraviolet rays of 280nm-400nm; therefore, the hindered phenol structure and triazine structure in the additive work synergistically, giving the additive excellent resistance to thermal oxidation aging and ultraviolet aging.

[0011] The additive contains two terminal hydroxyl groups, which can react chemically with the isocyanate group of diisocyanate during the preparation of the polyurethane elastomer. This can not only reduce the amount of chain extender used, but also make the additive stably present in the polyurethane elastomer, thereby giving full play to the anti-aging effect, protecting the composite plastic material, and extending the service life of the composite plastic material.

[0012] The additive also contains terminal carbon-carbon double bonds, which can react chemically with the carbon-carbon double bonds of the side chains of EPDM rubber and the carbon-carbon double bonds on the surface of the modified filler under the action of the vulcanizing agent. This not only further increases the stability of the additive, but also increases the compatibility between the polyurethane elastomer and the modified filler and EPDM rubber, while also increasing the dispersion of the modified filler, so that the modified filler can fully play its role and improve the UV resistance, wear resistance, acid and alkali resistance, etc. of the composite plastic material.

[0013] Furthermore, the composite plastic material in step (2) comprises the following raw materials in parts by weight: 25-35 parts of polyurethane elastomer, 20-30 parts of modified filler, 15-25 parts of styrene-butadiene rubber, 15-25 parts of natural rubber, 15-25 parts of EPDM rubber, 3-8 parts of softener, 2-5 parts of colorant, 2-5 parts of vulcanizer, and 1-2 parts of accelerator.

[0014] Furthermore, the modified filler is prepared by the following steps: S4. Blow nitrogen through a dry three-necked flask to expel air and moisture from the flask, then add KH-540 (3-aminopropyltrimethoxysilane), triethylamine and benzene, stir and heat to 65°C, then slowly add 7-bromo-1-heptene, stir and react for 3 hours after the addition is complete, cool to room temperature after the reaction is complete, and distill under reduced pressure to obtain intermediate 3; the dosage ratio of KH-540, 7-bromo-1-heptene, triethylamine and benzene is 17.5mL:17.4mL:14mL:180mL; Triethylamine is used as an acid binding agent, and the molar ratio of 7-bromo-1-heptene to KH-540 is controlled to be 1.1-1.15:1. Then, 7-bromo-1-heptene and KH-540 undergo a substitution reaction under heating. The reaction process is as follows: S5. Disperse the inorganic filler in deionized water, add acetic acid to adjust the pH to 4, stir for 30 minutes, transfer to a dry three-necked flask, continue stirring and set aside; disperse the intermediate 3 in anhydrous ethanol, stir for 30 minutes, transfer to the above flask, heat to 65°C and react for 1 hour after the transfer, cool to room temperature after the reaction is completed, centrifuge, take the precipitate and ultrasonically shake it in anhydrous ethanol for 10 minutes, and dry it at 80°C for 12 hours to obtain a modified filler.

[0015] Furthermore, the inorganic filler is a mixture of titanium dioxide, talc, calcium carbonate and barium sulfate in a mass ratio of 3:1:1:1.

[0016] Furthermore, the mass ratio of the inorganic filler to the intermediate 3 is 20:1.

[0017] Titanium dioxide is an N-type semiconductor. When ultraviolet rays irradiate the surface of titanium dioxide, the light energy excites the electrons in the titanium dioxide semiconductor, causing it to be excited from the valence band to the conduction band, generating photogenerated electrons and photogenerated holes. These photogenerated electrons and photogenerated holes have reducing and oxidizing properties, and can react with ultraviolet rays, thereby absorbing ultraviolet rays; talcum powder and calcium carbonate can increase the wear resistance, heat resistance and durability of composite plastic materials; barium sulfate is insoluble in water, acid, alkali, etc., and has excellent chemical resistance and weather resistance, which can increase the acid and alkali resistance and weather resistance of composite plastic materials.

[0018] The silaneoxy groups on the surface of the intermediate 3 are hydrolyzed and condensed under acidic conditions to generate Si-O-Si and Si-OH. Si-OH can form a chemical bond with the hydroxyl groups on the surface of the inorganic filler. The chemical bond reduces the surface energy of the inorganic filler, thereby increasing the compatibility between the prepared modified filler and the remaining raw materials. The oil-soluble long alkyl chains on the surface of the modified filler also further increase the compatibility between the modified filler and the remaining raw materials. In addition, there are carbon-carbon double bonds on the surface of the modified filler, which react chemically with the carbon-carbon double bonds at the end of the additive and the carbon-carbon double bonds on the side chains of the EPDM rubber under the action of the vulcanizing agent, which enables the filler to be highly dispersed and stably present in the composite plastic material, fully exerting its function and giving the composite plastic material excellent and stable UV resistance, wear resistance, acid and alkali resistance, etc.

[0019] Furthermore, the colorant is one or more of red iron oxide, carbon black, and fast red.

[0020] Furthermore, the vulcanizing agent is one or both of sulfur and benzoyl peroxide.

[0021] Furthermore, the accelerator is one or more of tetramethylthiuram disulfide, 2,2'-dibenzothiazole disulfide, and 2-mercaptobenzothiazole.

[0022] Furthermore, the softener is one of epoxy oils.

[0023] The present invention also discloses a composite plastic material for an outdoor runway, and the composite plastic material for an outdoor runway is prepared according to the above-mentioned method for preparing the composite plastic material for an outdoor runway.

[0024] The invention has the beneficial effects that the auxiliary agent containing hindered phenol structure and triazine structure can reduce the amount of chain extender used and has chemical reaction with diisocyanate, so the auxiliary agent can stably exist in polyurethane elastomer, and there is chemical reaction between the auxiliary agent, modified filler and EPDM rubber, which not only promotes the compatibility between polyurethane elastomer and raw materials such as styrene-butadiene rubber and EPDM rubber, but also forms a hybrid cross-linked network structure between polyurethane elastomer and modified filler and EPDM rubber, the auxiliary agent and modified filler are stably present in the network structure and can exert their own functions to the maximum extent, so that the composite plastic material of the invention has high-efficiency and lasting resistance to thermal oxidation aging, resistance to ultraviolet aging, wear resistance, acid and alkali resistance and the like. DETAILED DESCRIPTION

[0025] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] Example 1 Preparation of auxiliary agent, the specific steps are as follows: S1. Under nitrogen protection, 18.5 g of cyanuric chloride, 10.5 mL of N-methylallylamine and 200 mL of toluene were added to a 500 mL dry three-necked flask, stirred until completely dissolved, and then 20 mL of 20 wt% sodium bicarbonate solution was slowly added. After the addition was completed, the mixture was reacted in an ice water bath (0°C) for 6 h. After the reaction was completed, deionized water was added and shaken, and then allowed to stand for stratification. The aqueous phase was separated and the pH was measured until the pH of the aqueous phase was neutral. The organic phase was then dried over anhydrous magnesium sulfate, filtered, and the filtrate was distilled under reduced pressure to obtain intermediate 1. S2. In a 500 mL dry brown three-necked flask under nitrogen protection, 10.5 mL of resorcinol, 3.1 g of anhydrous aluminum chloride and 220 mL of dimethyl sulfoxide were added in sequence, and after stirring evenly, 20.8 g of intermediate 1 was added, and then the temperature was raised to 120°C for 10 h. After the reaction was completed, the reaction mixture was slowly poured into ice water to precipitate a solid, which was filtered and then recrystallized with 80% methanol aqueous solution to obtain intermediate 2; S3. Under nitrogen protection, add 24.9 g of intermediate 2 and 240 mL of dimethyl sulfoxide into a 500 mL dry three-necked flask, stir until completely dissolved, heat to 50°C and slowly add 36.2 g of 3,5-di(tert-butyl)-4-hydroxy-benzenepropionic acid, 3-hydroxy-2,2-bis(hydroxymethyl)propyl ester, stir and react for 3 hours. During the entire reaction, adjust the pH value of the system to 7 with 10 wt% sodium carbonate solution. After the reaction is completed, add deionized water, shake and let stand to separate. Take the organic phase, dry it with anhydrous magnesium sulfate, filter it, and distill the filtrate under reduced pressure to obtain an auxiliary agent.

[0027] Example 2 The specific steps for preparing the modified filler are as follows: S4, nitrogen was blown into a 500 mL dry three-necked flask to expel air and moisture in the flask, and then 17.5 mL KH-540, 14 mL triethylamine and 180 mL benzene were added, and then 17.4 mL 7-bromo-1-heptene was slowly added after stirring and heating to 65°C. After the addition was completed, the reaction was stirred for 3 h. After the reaction was completed, the reaction was cooled to room temperature and distilled under reduced pressure to obtain intermediate 3; S5. Disperse 22.5g titanium dioxide, 7.5g talcum powder, 7.5g calcium carbonate and 7.5g barium sulfate in 250mL deionized water, add acetic acid to adjust the pH to 4, stir for 30min, transfer to a 500mL dry three-necked flask, continue stirring and set aside; disperse 2.25g intermediate 3 in 20mL anhydrous ethanol, stir for 30min, transfer to the above flask, heat to 65℃ and react for 1h after transfer, cool to room temperature after the reaction, centrifuge, take the precipitate and ultrasonically vibrate in anhydrous ethanol for 10min, and dry at 80℃ for 12h to obtain modified filler.

[0028] Example 3 The specific steps for preparing the composite plastic material for outdoor running track are as follows: (1) 20 parts of polybutylene terephthalate and 40 parts of terminal hydroxyl polybutadiene were stirred and heated to 120°C, dehydrated for 2 hours, then cooled to 60°C, 30 parts of toluene diisocyanate were added, stirred and heated to 80°C for reaction for 2 hours, and then 2 parts of ethylene glycol and 0.8 parts of the auxiliary agent prepared in Example 1 were added in sequence, stirred and poured into a mold, vulcanized, aged, and demolded to obtain a polyurethane elastomer; (2) 25 parts of the polyurethane elastomer prepared in step (1), 20 parts of the modified filler prepared in Example 2, 15 parts of styrene-butadiene rubber, 15 parts of natural rubber, 15 parts of ethylene-propylene-diene rubber, 3 parts of KN4006 naphthenic oil produced by Shenzhen Zhongruntong Chemical Co., Ltd. and 2 parts of red iron oxide are mixed, followed by refining and calendering, and then mixed with 1 part of sulfur, 1 part of benzoyl peroxide and 1 part of tetramethylthiuram disulfide and vulcanized, and finally calendered to obtain a composite plastic material for an outdoor runway.

[0029] Example 4 The specific steps for preparing the composite plastic material for outdoor running track are as follows: (1) 30 parts of polybutylene terephthalate and 45 parts of terminal hydroxyl polybutadiene were stirred and heated to 120°C, dehydrated for 2 hours, then cooled to 60°C, 40 parts of isophorone diisocyanate were added, stirred and heated to 80°C for reaction for 2 hours, and then 3 parts of 1,4-butanediol and 1.2 parts of the auxiliary agent prepared in Example 1 were added in sequence, stirred and poured into a mold, vulcanized, aged and demolded to obtain a polyurethane elastomer; (2) 30 parts of the polyurethane elastomer prepared in step (1), 25 parts of the modified filler prepared in Example 2, 20 parts of styrene-butadiene rubber, 20 parts of natural rubber, 20 parts of ethylene-propylene-diene rubber, 6 parts of KN4006 naphthenic oil produced by Shenzhen Zhongruntong Chemical Co., Ltd., 2 parts of red iron oxide and 2 parts of carbon black are mixed, followed by refining and calendering, and then mixed with 3 parts of benzoyl peroxide and 1.5 parts of 2-mercaptobenzothiazole and vulcanized, and finally calendered to obtain a composite plastic material for an outdoor runway.

[0030] Example 5 The specific steps for preparing the composite plastic material for outdoor running track are as follows: (1) 40 parts of polybutylene terephthalate and 50 parts of terminal hydroxyl polybutadiene were stirred and heated to 120°C, dehydrated for 2 hours, then cooled to 60°C, 50 parts of hexamethylene diisocyanate were added, stirred and heated to 80°C for reaction for 2 hours, and then 4 parts of 1,4-butanediol and 1.5 parts of the auxiliary agent prepared in Example 1 were added in sequence, stirred and poured into a mold, vulcanized, aged, and demolded to obtain a polyurethane elastomer; (2) 35 parts of the polyurethane elastomer prepared in step (1), 30 parts of the modified filler prepared in Example 2, 25 parts of styrene-butadiene rubber, 25 parts of natural rubber, 25 parts of ethylene-propylene-diene rubber, 8 parts of KN4006 naphthenic oil produced by Shenzhen Zhongruntong Chemical Co., Ltd. and 5 parts of light-fast red are mixed, followed by refining and calendering, and then mixed with 2.5 parts of sulfur, 2.5 parts of benzoyl peroxide, 1 part of 2,2'-dibenzothiazole disulfide and 1 part of 2-mercaptobenzothiazole and vulcanized, and finally calendered to obtain a composite plastic material for an outdoor runway.

[0031] Comparative Example 1 The specific steps for preparing the composite plastic material for outdoor running track are as follows: The remaining steps remain unchanged, only the auxiliary agent in Example 3 is replaced by 0.4 parts of antioxidant 4010 and 0.4 parts of ultraviolet absorber UV-531 to prepare a composite plastic material for an outdoor runway.

[0032] Comparative Example 2 The specific steps for preparing the composite plastic material for outdoor running track are as follows: The remaining steps remain unchanged, except that the modified filler in Example 3 is replaced by 20 parts of untreated inorganic filler (a mixture of 22.5 g titanium dioxide, 7.5 g talcum powder, 7.5 g calcium carbonate and 7.5 g barium sulfate) to prepare a composite plastic material for an outdoor runway.

[0033] Performance Testing The composite plastic materials for outdoor running tracks prepared in Examples 3-5 and Comparative Examples 1-2 were subjected to the following performance tests: (1) Tensile strength test: refer to GB36246-2018 "Synthetic material surface playground for primary and secondary schools"; (2) Heat aging test: dry heat aging for 120 h at 105 °C, and then tensile strength test with reference to GB36246-2018 "Synthetic material surface playgrounds for primary and secondary schools"; (3) Anti-ultraviolet aging test: at room temperature, vertical irradiation distance of 20cm, under 30W ultraviolet lamp, ultraviolet aging for 120h, and then tensile strength test with reference to GB36246-2018 "Synthetic material surface playground for primary and secondary schools"; (4) Acid resistance and alkali resistance test: refer to GB / T19250 2013; (5) Solvent resistance: Soak in 120# solvent oil for 7 days to test its strength retention rate; The test results of all items are shown in the following table: In the description of the specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0034] The above contents are merely examples and explanations of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the invention or exceed the scope defined by the claims, they shall all fall within the protection scope of the present invention.

Claims

1. A method for preparing a composite plastic material for an outdoor runway, characterized in that: The following steps are involved: (1) Stirring polybutylene terephthalate and terminal hydroxyl polybutadiene and heating to 120°C, dehydrating for 2 hours, cooling to 60°C, adding diisocyanate, stirring, reacting at 80°C for 2 hours, adding chain extender and auxiliary agent, stirring, pouring into a mold, vulcanizing, aging, and demolding to obtain a polyurethane elastomer; (2) mixing polyurethane elastomer, modified filler, styrene-butadiene rubber, natural rubber, EPDM rubber, softener and colorant, refining and calendering, and then mixing with vulcanizing agent and accelerator, vulcanizing, and calendering to obtain composite plastic material for outdoor running track; In step (1), the polyurethane elastomer comprises the following raw materials in parts by weight: 20-40 parts of polybutylene terephthalate, 40-50 parts of terminal hydroxyl polybutadiene, 30-50 parts of diisocyanate, 2-4 parts of chain extender, and 0.8-1.5 parts of auxiliary agent; The composite plastic material in step (2) comprises the following raw materials in parts by weight: 25-35 parts of polyurethane elastomer, 20-30 parts of modified filler, 15-25 parts of styrene-butadiene rubber, 15-25 parts of natural rubber, 15-25 parts of EPDM rubber, 3-8 parts of softener, 2-5 parts of colorant, 2-5 parts of vulcanizer, and 1-2 parts of accelerator.

2. The method for preparing a composite plastic material for an outdoor runway according to claim 1, characterized in that: The auxiliary agent is prepared by the following steps: S1. Add cyanuric chloride, N-methylallylamine and toluene into a flask under nitrogen protection, add sodium bicarbonate solution after stirring, react for 6 hours in an ice-water bath, add deionized water, separate the layers, measure the pH of the aqueous phase to neutral, take the organic phase, dry it, filter it, and distill it under reduced pressure to obtain intermediate 1; S2. Add resorcinol, anhydrous aluminum chloride and dimethyl sulfoxide into a flask under nitrogen protection, add intermediate 1 after stirring, react at 120° C. for 10 h, pour into ice water, precipitate solid, filter, and recrystallize to obtain intermediate 2; S3. Under nitrogen protection, add intermediate 2 and dimethyl sulfoxide into a flask, stir and heat to 50°C, then add 3,5-di(tert-butyl)-4-hydroxy-phenylpropionic acid and 3-hydroxy-2,2-bis(hydroxymethyl)propyl ester, and react for 3 hours. During this period, adjust the pH value of the system to 7. After the reaction, add deionized water, separate the layers, take the organic phase, dry it, filter it, and distill it under reduced pressure to obtain an auxiliary agent; The modified filler is prepared by the following steps: S4, after nitrogen blowing into the flask, KH-540, triethylamine and benzene were added, the temperature was raised to 65°C with stirring, 7-bromo-1-heptene was added, the reaction was continued for 3 hours, the reaction was cooled, and the intermediate 3 was obtained by distillation under reduced pressure; S5, dispersing the inorganic filler in deionized water, adding acetic acid to adjust the pH to 4, and transferring the mixture into a flask after stirring; The intermediate 3 was dispersed in anhydrous ethanol, transferred to the above flask after stirring, heated to 65°C for reaction for 1 hour, cooled, centrifuged, ultrasonically vibrated, and dried to obtain a modified filler.

3. The method for preparing a composite plastic material for an outdoor runway according to claim 2, characterized in that: The dosage ratio of cyanuric chloride and N-methylallylamine in step S1 is 18.5g:10.5mL; the dosage ratio of intermediate 1, resorcinol, anhydrous aluminum chloride and dimethyl sulfoxide in step S2 is 20.8g:10.5mL:3.1g:220mL; the dosage ratio of 3,5-di(tert-butyl)-4-hydroxy-benzenepropionic acid, 3-hydroxy-2,2-bis(hydroxymethyl)propyl ester and intermediate 2 in step S3 is 36.2g:24.9g.

4. The method for preparing a composite plastic material for an outdoor runway according to claim 2, characterized in that: The dosage ratio of KH-540, 7-bromo-1-heptene, triethylamine and benzene in step S4 is 17.5 mL: 17.4 mL: 14 mL: 180 mL; the inorganic filler in step S5 is a mixture of titanium dioxide, talc, calcium carbonate and barium sulfate in a mass ratio of 3:1:1:1; the mass ratio of the inorganic filler in step S5 to the intermediate 3 is 20:

1.

5. The method for preparing a composite plastic material for an outdoor runway according to claim 1, characterized in that: The diisocyanate is one or more of toluene diisocyanate, isophorone diisocyanate and hexamethylene diisocyanate.

6. The method for preparing a composite plastic material for an outdoor runway according to claim 1, characterized in that: The chain extender is one or two of ethylene glycol and 1,4-butanediol.

7. The method for preparing a composite plastic material for an outdoor runway according to claim 1, characterized in that: The colorant is one or more of red iron oxide, carbon black, and sun-fast red.

8. The method for preparing a composite plastic material for an outdoor runway according to claim 1, characterized in that: The vulcanizing agent is one or both of sulfur and benzoyl peroxide.

9. The method for preparing a composite plastic material for an outdoor runway according to claim 1, characterized in that: The accelerator is one or more of tetramethylthiuram disulfide, 2,2'-dibenzothiazole disulfide and 2-mercaptobenzothiazole; the softener is one of epoxy oils.

10. A composite plastic material for an outdoor running track, characterized in that: The outdoor running track is prepared according to the method for preparing a composite plastic material according to any one of claims 1 to 9.

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