Preparation method of titanium dioxide modified polystyrene composite material

Abstract

The invention relates to the technical field of polystyrene, and discloses a titanium dioxide modified polystyrene composite material, titanium dioxide reacts with oleic acid and is further oxidized to obtain epoxidized titanium dioxide, fludioxonil reacts with allyl glycidyl ether to obtain alkenylated fludioxonil, and the alkenylated fludioxonil is further copolymerized with maleic anhydride and styrene to obtain the titanium dioxide modified polystyrene composite material. The modified polystyrene further reacts with epoxidized titanium dioxide to obtain a titanium dioxide modified polystyrene composite material, agglomeration is reduced, fludioxonil interferes with normal cell cycles and glycerol production ways of microorganisms such as escherichia coli, so that the microorganisms such as escherichia coli cannot survive; photo-induced electrons and holes of titanium dioxide respectively react with oxygen and water to generate superoxide anions and hydroxyl radicals with strong oxidizing property, so that the biological structure of microorganisms such as escherichia coli is destroyed, the stability of the internal environment of the microorganisms is reduced, and the composite material has excellent antibacterial property.

Description

Technical Field

[0001] The invention relates to the technical field of polystyrene, in particular to a method for preparing a composite material of titanium dioxide modified polystyrene. Background Art

[0002] Polystyrene material is a colorless and transparent thermoplastic resin plastic obtained by the polymerization of styrene monomers. It has the advantages of high glass transition temperature, excellent thermal insulation performance, good insulation performance, excellent optical properties, good chemical stability, good processing performance, high impact resistance, etc. It is widely used in building decoration, body structure, electrical housing, various plastic products and packaging materials, but it does not have the antibacterial and antibacterial properties against microorganisms such as Escherichia coli, which limits its application range to a certain extent. As people pay more and more attention to their own health issues, polystyrene needs to be chemically modified to broaden its application range.

[0003] Titanium dioxide is an inorganic metal oxide with unique functions. It has excellent chemical stability, good thermal stability, excellent photocatalytic degradation performance, and photocatalytic antibacterial performance. It is widely used in coating blending, rubber fillers, artificial fibers, cosmetics, photocatalytic degradation, photocatalytic antibacterial and other fields. It can be used as a modifier to chemically modify polystyrene, improve the comprehensive performance of polystyrene, and thus broaden the application range of polystyrene. However, titanium dioxide has poor dispersibility and interfacial compatibility in the organic polymer polystyrene matrix and is prone to agglomeration, which affects the modification effect on polystyrene. Fluoxetine is a pyrrole broad-spectrum fungicide that is widely used in foliar sterilization, seed treatment, etc. It can be synergistically modified with titanium dioxide to further improve the comprehensive performance of polystyrene. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a method for preparing a composite material of titanium dioxide modified polystyrene, which solves the problem that the antibacterial performance of polystyrene is poor.

[0005] To achieve the above object, the present invention provides the following technical solution: a titanium dioxide-modified polystyrene composite material, wherein the preparation method of the titanium dioxide-modified polystyrene composite material is as follows: (1) Add deionized water-ethanol mixed solvent, oleic acid, and nano-titanium dioxide in a volume ratio of 1:1-2.5 into a reaction bottle, disperse them evenly, transfer them into a reaction kettle, react, centrifuge, wash with anhydrous ethanol, and dry to obtain oleic acid-grafted titanium dioxide; (2) Add a dichloromethane-cyclohexane mixed solvent, oleic acid-grafted titanium dioxide, and m-chloroperbenzoic acid in a volume ratio of 1:1-2.5 into a reaction bottle, disperse them evenly, react, centrifuge, wash with ethanol, and dry to obtain epoxidized titanium dioxide; (3) Add dimethyl sulfoxide solvent, allyl glycidyl ether, and fluoxetine to the reaction flask, disperse them evenly, add triethylamine to adjust the pH of the solution to 8-11, stir and react at 55-70 °C for 60-90 h, filter, wash with ethanol and dry to obtain alkenyl fluoxetine with the molecular formula C 18 H 17 F2N2O4; (4) Add toluene solvent, initiator benzoyl peroxide, maleic anhydride, alkenyl fludioxonil, and styrene into a reaction bottle, disperse them evenly, react at 65-80 °C in a nitrogen atmosphere for 6-9 h, precipitate the product with methanol, filter and dry, purify and dry with a Soxhlet extractor to obtain modified polystyrene; (5) Add N,N-dimethylformamide solvent, catalyst 2-methylimidazole, epoxidized titanium dioxide, and modified polystyrene into a reaction bottle, disperse them evenly, react at 150-180 °C for 2-3.5 h, precipitate the product with methanol, separate by centrifugation, wash with ethanol, and dry to obtain a composite material of titanium dioxide modified polystyrene.

[0006] Preferably, in step (1), the mass ratio of oleic acid to nano-titanium dioxide is 3-6:100.

[0007] Preferably, the reaction conditions in step (1) are 150-180° C. for 6-12 h.

[0008] Preferably, in step (2), the mass ratio of oleic acid grafted titanium dioxide to m-chloroperbenzoic acid is 0.3-0.6:100.

[0009] Preferably, the reaction conditions in step (2) are reflux reaction at 55-70°C for 2-3.5 h.

[0010] Preferably, in step (3), the mass ratio of allyl glycidyl ether to fludioxonil is 40-70:100.

[0011] Preferably, in step (4), the mass ratio of benzoyl peroxide, maleic anhydride, alkenyl fludioxonil and styrene is 0.2-0.5:2-5:2-3.5:100.

[0012] Preferably, in step (5), the mass ratio of 2-methylimidazole, epoxidized titanium dioxide and modified polystyrene is 1-2.5:2-3.5:100.

[0013] Compared with the prior art, the present invention has the following beneficial technical effects: The composite material of titanium dioxide modified polystyrene comprises the following steps: esterification reaction occurs between the hydroxyl group on nano titanium dioxide and the carboxyl group on oleic acid to obtain titanium dioxide covalently grafted with oleic acid, alkenyl groups are introduced, and the titanium dioxide is further oxidized by m-chloroperbenzoic acid to generate epoxy groups, thereby introducing epoxy groups to obtain epoxidized titanium dioxide; ring-opening reaction occurs between the imino group on fludioxonil and the epoxy groups of allyl glycidyl ether to covalently graft the fludioxonil with allyl glycidyl ether, alkenyl groups are introduced to obtain alkenylated fludioxonil; free radical polymerization occurs between alkenylated fludioxonil, maleic anhydride and styrene under the action of an initiator benzoyl peroxide to obtain modified polystyrene, and anhydride groups are introduced.

[0014] The composite material of titanium dioxide modified polystyrene is characterized in that under the action of catalyst 2-methylimidazole, the epoxy groups on the titanium dioxide are combined with 2-methylimidazole to be positively charged, the anhydride groups on the polystyrene are ring-opened to obtain a carboxylic acid nucleophilic reagent, and the positively charged epoxy groups are further attacked, so that the epoxy groups are ring-opened and undergo an esterification reaction with the carboxylic acid nucleophilic reagent, and the titanium dioxide is covalently grafted with the polystyrene to obtain the composite material of titanium dioxide modified polystyrene, the dispersibility and interface compatibility of titanium dioxide in a polystyrene matrix are improved, the titanium dioxide is uniformly dispersed in the polystyrene matrix, and the agglomeration phenomenon is reduced.

[0015] The composite material of titanium dioxide modified polystyrene, fludioxonil causes a pressure state inside microorganisms such as Escherichia coli, enhances the activity of the prototype hybrid histidase, thereby interfering with the normal cell cycle and glycerol production pathway of microorganisms such as Escherichia coli, making it impossible for microorganisms such as Escherichia coli to survive, thereby achieving the effect of killing microorganisms such as Escherichia coli, and at the same time, under light conditions, photogenerated electrons generated by the titanium dioxide are excited to react with oxygen to generate superoxide anions, and holes react with water to generate hydroxyl free radicals. The superoxide anions and hydroxyl free radicals with strong oxidizing properties can react with enzymes, polypeptides, proteins, ribonucleotides and other bioactive substances, thereby destroying the biological structure of microorganisms such as Escherichia coli, reducing the stability of their internal environment, and making the composite material have excellent antibacterial properties. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a synthetic route for alkenyl fludioxonil. DETAILED DESCRIPTION

[0017] To achieve the above object, the present invention provides the following specific implementation methods and examples: A composite material of titanium dioxide modified polystyrene, and a preparation method of the composite material of titanium dioxide modified polystyrene is as follows: (1) Add deionized water-ethanol mixed solvent with a volume ratio of 1:1-2.5, oleic acid, and nano-titanium dioxide in a mass ratio of 3-6:100 to a reaction bottle, disperse them evenly, transfer them into a reaction kettle, react at 150-180 °C for 6-12 h, centrifuge, wash with anhydrous ethanol and dry to obtain oleic acid grafted titanium dioxide; (2) Adding a dichloromethane-cyclohexane mixed solvent in a volume ratio of 1:1-2.5, oleic acid grafted titanium dioxide, and m-chloroperbenzoic acid in a mass ratio of 0.3-0.6:100 to a reaction bottle, dispersing them evenly, reflux reacting at 55-70 °C for 2-3.5 h, centrifuging, washing with ethanol and drying to obtain epoxidized titanium dioxide; (3) Add dimethyl sulfoxide solvent, allyl glycidyl ether, and fludioxonil in a mass ratio of 40-70:100 to the reaction flask, disperse them evenly, add triethylamine to adjust the pH of the solution to 8-11, stir and react at 55-70 °C for 60-90 hours, filter, wash with ethanol and dry to obtain alkenyl fludioxonil with a molecular formula of C 18 H 17 F2N2O4; (4) Add toluene solvent, initiator benzoyl peroxide, maleic anhydride, alkenyl fludioxonil, and styrene in a mass ratio of 0.2-0.5:2-5:2-3.5:100 to a reaction bottle, disperse them evenly, react at 65-80 °C in a nitrogen atmosphere for 6-9 h, precipitate the product with methanol, filter and dry, purify and dry with a Soxhlet extractor to obtain modified polystyrene; (5) Add N,N-dimethylformamide solvent, catalyst 2-methylimidazole, epoxidized titanium dioxide, and modified polystyrene into a reaction flask in a mass ratio of 1-2.5:2-3.5:100, disperse them evenly, react at 150-180 °C for 2-3.5 h, precipitate the product with methanol, separate by centrifugation, wash with ethanol, and dry to obtain a composite material of titanium dioxide modified polystyrene. Example 1

[0018] (1) Add deionized water-ethanol mixed solvent with a volume ratio of 1:1, oleic acid, and nano-titanium dioxide in a mass ratio of 3:100 to a reaction bottle, disperse them evenly, transfer them into a reactor, react at 150 °C for 6 h, centrifuge, wash with anhydrous ethanol and dry to obtain oleic acid-grafted titanium dioxide; (2) Add a 1:1 volume ratio of dichloromethane-cyclohexane mixed solvent, oleic acid grafted titanium dioxide, and m-chloroperbenzoic acid to a reaction flask. The mass ratio of the two is 0.3:100. Disperse them evenly, reflux at 55 °C for 2 h, centrifuge, wash with ethanol, and dry to obtain epoxidized titanium dioxide. (3) Add dimethyl sulfoxide solvent, allyl glycidyl ether, and fluoxathionil in a mass ratio of 40:100 to the reaction flask, disperse them evenly, add triethylamine to adjust the pH of the solution to 8, stir and react at 55 °C for 60 h, filter, wash with ethanol and dry to obtain alkenyl fluoxathionil with the molecular formula C 18 H 17 F2N2O4; (4) Add toluene solvent, initiator benzoyl peroxide, maleic anhydride, alkenyl fludioxonil, and styrene in a mass ratio of 0.2:2:2:100 to a reaction bottle, disperse them evenly, react at 65 °C for 6 h in a nitrogen atmosphere, precipitate the product with methanol, filter and dry, purify and dry with a Soxhlet extractor to obtain modified polystyrene; (5) Add N,N-dimethylformamide solvent, catalyst 2-methylimidazole, epoxidized titanium dioxide, and modified polystyrene into a reaction bottle in a mass ratio of 1:2:100, disperse them evenly, and react at 150 °C for 2 h. The product is precipitated with methanol, separated by centrifugation, washed with ethanol, and dried to obtain a composite material of titanium dioxide modified polystyrene. Example 2

[0019] (1) Add deionized water-ethanol mixed solvent with a volume ratio of 1:1.5, oleic acid, and nano-titanium dioxide in a mass ratio of 4:100 to a reaction bottle, disperse them evenly, transfer them into a reactor, react at 160 °C for 8 h, centrifuge, wash with anhydrous ethanol and dry to obtain oleic acid-grafted titanium dioxide; (2) Add a dichloromethane-cyclohexane mixed solvent with a volume ratio of 1:1.5, oleic acid grafted titanium dioxide, and m-chloroperbenzoic acid with a mass ratio of 0.4:100 into a reaction bottle, disperse them evenly, reflux at 60 °C for 2.5 h, centrifuge, wash with ethanol and dry to obtain epoxidized titanium dioxide; (3) Add dimethyl sulfoxide solvent, allyl glycidyl ether, and fludioxonil in a mass ratio of 50:100 to the reaction flask, disperse them evenly, add triethylamine to adjust the pH of the solution to 9, stir and react at 60 °C for 70 h, filter, wash with ethanol and dry to obtain alkenyl fludioxonil with the molecular formula C 18 H 17 F2N2O4; (4) Add toluene solvent, initiator benzoyl peroxide, maleic anhydride, alkenyl fludioxonil, and styrene in a mass ratio of 0.3:3:2.5:100 to a reaction bottle, disperse them evenly, react at 70 °C for 7 h in a nitrogen atmosphere, precipitate the product with methanol, filter and dry, purify and dry with a Soxhlet extractor to obtain modified polystyrene; (5) Add N,N-dimethylformamide solvent, catalyst 2-methylimidazole, epoxidized titanium dioxide, and modified polystyrene into a reaction flask in a mass ratio of 1.5:2.5:100, disperse them evenly, and react at 160 °C for 2.5 h. Precipitate the product with methanol, separate by centrifugation, wash with ethanol, and dry to obtain a composite material of titanium dioxide modified polystyrene. Example 3

[0020] (1) Add deionized water-ethanol mixed solvent with a volume ratio of 1:2, oleic acid, and nano-titanium dioxide in a mass ratio of 5:100 to a reaction bottle, disperse them evenly, transfer them into a reactor, react at 170 °C for 10 h, centrifuge, wash with anhydrous ethanol and dry to obtain oleic acid-grafted titanium dioxide; (2) Add a mixed solvent of dichloromethane and cyclohexane in a volume ratio of 1:2, oleic acid grafted titanium dioxide, and m-chloroperbenzoic acid in a mass ratio of 0.5:100 into a reaction bottle, disperse them evenly, reflux at 65 °C for 3 h, centrifuge, wash with ethanol and dry to obtain epoxidized titanium dioxide; (3) Add dimethyl sulfoxide solvent, allyl glycidyl ether, and fluoxathione into the reaction flask in a mass ratio of 60:100, disperse them evenly, add triethylamine to adjust the pH of the solution to 10, stir and react at 65 °C for 80 h, filter, wash with ethanol and dry to obtain alkenyl fluoxathione with the molecular formula C 18 H 17 F2N2O4; (4) Add toluene solvent, initiator benzoyl peroxide, maleic anhydride, alkenyl fludioxonil, and styrene in a mass ratio of 0.4:4:3:100 to a reaction bottle, disperse them evenly, react at 75 °C for 8 h in a nitrogen atmosphere, precipitate the product with methanol, filter and dry, purify and dry with a Soxhlet extractor to obtain modified polystyrene; (5) Add N,N-dimethylformamide solvent, catalyst 2-methylimidazole, epoxidized titanium dioxide, and modified polystyrene into a reaction flask in a mass ratio of 2:3:100, disperse them evenly, and react at 170 °C for 3 h. The product is precipitated with methanol, separated by centrifugation, washed with ethanol, and dried to obtain a composite material of titanium dioxide modified polystyrene. Example 4

[0021] (1) Add deionized water-ethanol mixed solvent with a volume ratio of 1:2.5, oleic acid, and nano-titanium dioxide in a mass ratio of 6:100 to a reaction bottle, disperse them evenly, transfer them into a reactor, react at 180 °C for 12 h, centrifuge, wash with anhydrous ethanol and dry to obtain oleic acid-grafted titanium dioxide; (2) Add a dichloromethane-cyclohexane mixed solvent with a volume ratio of 1:2.5, oleic acid grafted titanium dioxide, and m-chloroperbenzoic acid with a mass ratio of 0.6:100 into a reaction bottle, disperse them evenly, reflux them at 70 °C for 3.5 h, centrifuge, wash with ethanol and dry to obtain epoxidized titanium dioxide; (3) Add dimethyl sulfoxide solvent, allyl glycidyl ether, and fluoxathionil in a mass ratio of 70:100 to the reaction flask, disperse them evenly, add triethylamine to adjust the pH of the solution to 11, stir and react at 70 °C for 90 h, filter, wash with ethanol and dry to obtain alkenyl fluoxathionil with the molecular formula C 18 H 17 F2N2O4; (4) Add toluene solvent, initiator benzoyl peroxide, maleic anhydride, alkenyl fludioxonil, and styrene in a mass ratio of 0.5:5:3.5:100 to a reaction bottle, disperse them evenly, react at 80 °C for 9 h in a nitrogen atmosphere, precipitate the product with methanol, filter and dry, purify and dry with a Soxhlet extractor to obtain modified polystyrene; (5) N,N-dimethylformamide solvent, catalyst 2-methylimidazole, epoxidized titanium dioxide, and modified polystyrene were added to a reaction bottle in a mass ratio of 2.5:3.5:100. The mixture was evenly dispersed and reacted at 180 °C for 3.5 h. The product was precipitated with methanol, separated by centrifugation, washed with ethanol, and dried to obtain a composite material of titanium dioxide modified polystyrene.

[0022] Comparative Example 1 (1) Add deionized water-ethanol mixed solvent with a volume ratio of 1:1, oleic acid, and nano-titanium dioxide in a mass ratio of 2.4:100 to a reaction bottle, disperse them evenly, transfer them into a reactor, react at 150 °C for 6 h, centrifuge, wash with anhydrous ethanol and dry to obtain oleic acid-grafted titanium dioxide; (2) Add a 1:1 volume ratio of dichloromethane-cyclohexane mixed solvent, oleic acid grafted titanium dioxide, and m-chloroperbenzoic acid to a reaction bottle. The mass ratio of the two is 0.24:100. Disperse them evenly, reflux at 55 °C for 2 h, centrifuge, wash with ethanol, and dry to obtain epoxidized titanium dioxide. (3) Add dimethyl sulfoxide solvent, allyl glycidyl ether, and fluoxathione into the reaction flask in a mass ratio of 32:100, disperse them evenly, add triethylamine to adjust the pH of the solution to 8, stir and react at 55 °C for 60 h, filter, wash with ethanol and dry to obtain alkenyl fluoxathione with the molecular formula C 18 H 17 F2N2O4; (4) Add toluene solvent, initiator benzoyl peroxide, maleic anhydride, alkenyl fludioxonil, and styrene in a mass ratio of 0.16:1.6:1.6:100 to a reaction bottle, disperse them evenly, react at 65 °C for 6 h in a nitrogen atmosphere, precipitate the product with methanol, filter and dry, purify and dry with a Soxhlet extractor to obtain modified polystyrene; (5) Add N,N-dimethylformamide solvent, catalyst 2-methylimidazole, epoxidized titanium dioxide, and modified polystyrene into a reaction flask in a mass ratio of 0.8:1.6:100, disperse them evenly, and react at 150 °C for 2 h. Precipitate the product with methanol, separate by centrifugation, wash with ethanol, and dry to obtain a composite material of titanium dioxide modified polystyrene.

[0023] Comparative Example 2 (1) Add deionized water-ethanol mixed solvent with a volume ratio of 1:2.5, oleic acid, and nano-titanium dioxide in a mass ratio of 7.2:100 to a reaction bottle, disperse them evenly, transfer them into a reactor, react at 180 °C for 12 h, centrifuge, wash with anhydrous ethanol and dry to obtain oleic acid-grafted titanium dioxide; (2) Add a dichloromethane-cyclohexane mixed solvent with a volume ratio of 1:2.5, oleic acid grafted titanium dioxide, and m-chloroperbenzoic acid with a mass ratio of 0.72:100 to a reaction bottle, disperse them evenly, reflux them at 70 °C for 3.5 h, centrifuge, wash with ethanol and dry to obtain epoxidized titanium dioxide; (3) Add dimethyl sulfoxide solvent, allyl glycidyl ether, and fluoxathionil in a mass ratio of 84:100 to the reaction flask, disperse them evenly, add triethylamine to adjust the pH of the solution to 11, stir and react at 70 °C for 90 h, filter, wash with ethanol and dry to obtain alkenyl fluoxathionil with the molecular formula C 18 H 17 F2N2O4; (4) Add toluene solvent, initiator benzoyl peroxide, maleic anhydride, alkenyl fludioxonil, and styrene in a mass ratio of 0.6:6:4.2:100 to a reaction bottle, disperse them evenly, react at 80 °C for 9 h in a nitrogen atmosphere, precipitate the product with methanol, filter and dry, purify and dry with a Soxhlet extractor to obtain modified polystyrene; (5) N,N-dimethylformamide solvent, catalyst 2-methylimidazole, epoxidized titanium dioxide, and modified polystyrene were added to a reaction bottle in a mass ratio of 3:4.2:100. The mixture was evenly dispersed and reacted at 180 °C for 3.5 h. The product was precipitated with methanol, separated by centrifugation, washed with ethanol, and dried to obtain a composite material of titanium dioxide modified polystyrene.

[0024] 100 uL of the diluted Escherichia coli test solution was inoculated on the front of the titanium dioxide modified polystyrene composite material obtained in the embodiment and the comparative example, and cultured at a constant temperature for 24 h. Then, the bacteria on the surface of the sample membrane were eluted with physiological saline, and the eluted bacteria were diluted with 1:10 7 Dilute it with physiological saline in a certain ratio, then take an appropriate amount of bacterial solution and culture it on solid culture medium, observe and calculate its concentration under a microscope, and calculate the antibacterial rate. The test standard is GB / T 31402-2015.

[0025]

[0026] 100 uL of the diluted Escherichia coli test solution was inoculated on the front of the composite material of titanium dioxide modified polystyrene obtained in the embodiment and the comparative example and irradiated with ultraviolet light for 24 h, and cultured at a constant temperature for 24 h. Then, the bacteria on the surface of the sample membrane were eluted with physiological saline, and the eluted bacteria were diluted with water at a ratio of 1:10. 7 Dilute it with physiological saline in a certain ratio, then take an appropriate amount of bacterial solution and culture it on solid culture medium, observe and calculate its concentration under a microscope, and calculate the antibacterial rate. The test standard is GB / T 23763-2009.

[0027]

Claims

1. A composite material of titanium dioxide modified polystyrene, characterized in that: The preparation method of the titanium dioxide modified polystyrene composite material is as follows: (1) adding oleic acid and nano-titanium dioxide to a deionized water-ethanol mixed solvent with a volume ratio of 1:1-2.5, dispersing the mixture evenly, transferring the mixture into a reaction kettle, reacting the mixture, centrifuging the mixture, washing the mixture and drying the mixture to obtain oleic acid-grafted titanium dioxide; (2) adding oleic acid grafted titanium dioxide and m-chloroperbenzoic acid to a mixed solvent of dichloromethane and cyclohexane in a volume ratio of 1:1-2.5, dispersing the mixture evenly, reacting the mixture, centrifuging, washing and drying the mixture to obtain epoxidized titanium dioxide; (3) Add allyl glycidyl ether and fludioxonil to dimethyl sulfoxide solvent, disperse evenly, add triethylamine to adjust the pH of the solution to 8-11, stir and react at 55-70 °C for 60-90 h, filter, wash and dry to obtain alkenyl fludioxonil with the molecular formula C 18 H 17 F2N2O4; (4) adding initiator benzoyl peroxide, maleic anhydride, alkenyl fludioxonil and styrene to toluene solvent, dispersing them evenly, reacting them at 65-80 °C in a nitrogen atmosphere for 6-9 h, precipitating the product with methanol, filtering and drying, purifying and drying with a Soxhlet extractor, and obtaining modified polystyrene; (5) Adding catalyst 2-methylimidazole, epoxidized titanium dioxide, and modified polystyrene into N,N-dimethylformamide solvent, dispersing them evenly, reacting them at 150-180 °C for 2-3.5 h, precipitating the product with methanol, centrifuging, washing, and drying to obtain a composite material of titanium dioxide modified polystyrene.

2. The titanium dioxide-modified polystyrene composite material according to claim 1, characterized in that: In the step (1), the mass ratio of oleic acid to nano-titanium dioxide is 3-6:

100.

3. The titanium dioxide modified polystyrene composite material according to claim 1, characterized in that: The reaction conditions in step (1) are 150-180° C. for 6-12 h.

4. The titanium dioxide-modified polystyrene composite material according to claim 1, characterized in that: In the step (2), the mass ratio of oleic acid grafted titanium dioxide to m-chloroperbenzoic acid is 0.3-0.6:

100.

5. The titanium dioxide modified polystyrene composite material according to claim 1, characterized in that: The reaction conditions in step (2) are reflux reaction at 55-70°C for 2-3.5 hours.

6. The titanium dioxide modified polystyrene composite material according to claim 1, characterized in that: In the step (3), the mass ratio of allyl glycidyl ether to fludioxonil is 40-70:

100.

7. The titanium dioxide-modified polystyrene composite material according to claim 1, characterized in that: In the step (4), the mass ratio of benzoyl peroxide, maleic anhydride, alkenyl fludioxonil and styrene is 0.2-0.5:2-5:2-3.5:

100.

8. The titanium dioxide modified polystyrene composite material according to claim 1, characterized in that: In the step (5), the mass ratio of 2-methylimidazole, epoxidized titanium dioxide and modified polystyrene is 1-2.5:2-3.5:100.

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