Thermoplastic elastomer material and preparation method thereof

Abstract

The invention relates to a thermoplastic elastomer material and a preparation method thereof, and belongs to the technical field of high polymer materials. The thermoplastic elastomer material comprises the following components in parts by weight: 10-20 parts of SEBS, 15-25 parts of SBS, 5-20 parts of a plasticizer, 25-35 parts of polylactic acid, 2-6 parts of a compatilizer, 0.1-0.3 part of an antioxidant, 2-10 parts of a modified flame retardant and 1-3 parts of a modified antibacterial agent, the thermoplastic elastomer material prepared by the invention not only has a good flame-retardant effect, but also has an excellent antibacterial effect.

Description

Technical Field

[0001] The present invention belongs to the technical field of polymer materials, and particularly relates to a thermoplastic elastomer material and a preparation method thereof. Background Art

[0002] Thermoplastic elastomer materials, also known as artificial rubber or synthetic rubber, are polymer materials that combine the processing characteristics of thermoplastic plastics and the elasticity of vulcanized rubber. At room temperature, they exhibit high rubber elasticity and can be processed plastically at high temperatures. They have advantages such as being safe and non-toxic, aging-resistant, highly elastic, soft and comfortable, and easy to process and form. They are widely used in fields such as cables, electrical appliances, and construction.

[0003] SEBS is obtained by hydrogenating the thermoplastic elastomer styrene-butadiene-styrene block copolymer (SBS), forming a polystyrene-polyethylene-polybutene-polystyrene block structure. It has excellent weather resistance, anti-aging property, heat resistance, and compression set resistance, and is recyclable. The properties of the products are uniform and the dimensions are controllable. However, traditional thermoplastic elastomer materials have a potential fire hazard and will release toxic gases when burning, threatening human health and safety. In addition, although thermoplastic elastomer materials have certain antibacterial properties, with the increasing requirements of actual applications, their own antibacterial properties can no longer meet the needs. Therefore, the research and development of excellent thermoplastic elastomer materials have important practical significance and application value. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides a thermoplastic elastomer material and a preparation method thereof.

[0005] The object of the present invention can be achieved by the following technical solutions:

[0006] A thermoplastic elastomer material and a preparation method thereof, comprising the following raw materials in parts by weight: 10-20 parts of SEBS, 15-25 parts of SBS, 5-20 parts of plasticizer, 25-35 parts of polylactic acid, 2-6 parts of compatibilizer, 0.1-0.3 parts of antioxidant, 2-10 parts of modified flame retardant, and 1-3 parts of modified antibacterial agent;

[0007] The plasticizer is polycaprolactone;

[0008] The compatibilizer is SBS-g-GMA;

[0009] The antioxidant is antioxidant 168.

[0010] The modified flame retardant is prepared by the following method:

[0011] Step A1: Mix glacial acetic acid and deionized water evenly, heat up to 60 - 80 °C, slowly dropwise add methylvinyldimethoxysilane, control the dropping time to be 15 min. After the dropping is completed, stir at a constant temperature of 60 - 80 °C for 1 - 4 h, cool to room temperature, filter, then add phenylphosphoryl dichloride and triethylamine and mix evenly, react for 10 h, carry out suction filtration, dry to obtain the compound;

[0012] Furthermore, the dosage ratio of glacial acetic acid, deionized water, methylvinyldimethoxysilane, phenylphosphoryl dichloride, and triethylamine is 20 - 30 mL : 50 mL : 0.1 - 0.2 mol : 0.2 - 0.4 mol : 20 - 40 mL;

[0013] First, use the silanol groups formed by the hydrolysis of methylvinyldimethoxysilane to react with the chlorine atoms of phenylphosphoryl dichloride to generate the compound;

[0014] Step A2: Mix the compound, pentaerythritol phosphate, and triethylamine evenly, first react at 120 °C for 3 h, then react at 150 °C for 3 h. After the reaction is completed, carry out suction filtration, vacuum distillation, and vacuum drying to obtain the intermediate;

[0015] Furthermore, the dosage ratio of the compound, pentaerythritol phosphate, and triethylamine is 0.1 - 0.2 mol : 0.2 - 0.4 mol : 15 mL;

[0016] Secondly, use the chlorine atoms of the compound to react with the hydroxyl groups of pentaerythritol phosphate to obtain the intermediate;

[0017] Step A3: Mix 9,10 - dihydro - 9 - oxa - 10 - phosphaphenanthrene - 10 - oxide, N,N - dimethylformamide, and the intermediate evenly, stir at 140 - 150 °C for 9 h, filter, wash, and vacuum dry at 60 °C for 24 h to obtain the modified flame retardant;

[0018] Furthermore, the dosage ratio of 9,10 - dihydro - 9 - oxa - 10 - phosphaphenanthrene - 10 - oxide, N,N - dimethylformamide, and the intermediate is 0.1 - 0.2 mol : 20 - 50 mL : 0.1 - 0.2 mol.

[0019] Finally, use the carbon - carbon double bonds of the intermediate to combine with 9,10 - dihydro - 9 - oxa - 10 - phosphaphenanthrene - 10 - oxide to obtain the modified flame retardant.

[0020] The modified antibacterial agent is prepared by the following method:

[0021] Step B1: Mix 1,3 - dichloroisopropanol, trimethylamine, and ethanol evenly, stir and react at 50 °C for 72 h. After the reaction is completed, carry out rotary evaporation, washing, suction filtration, and vacuum dry at 40 °C for 4 h to obtain the intermediate;

[0022] Furthermore, the dosage ratio of 1,3-dichloroisopropanol, trimethylamine, and ethanol is 0.01 - 0.02 mol : 0.02 - 0.04 mol : 50 - 100 mL;

[0023] First, utilize the reaction between the chlorine atom of 1,3-dichloroisopropanol and the amino group of trimethylamine to quaternize 1,3-dichloroisopropanol and generate an intermediate;

[0024] Step B2: Mix the intermediate and dimethyl sulfoxide evenly, stir in a water bath at 45 - 60 °C, cool to room temperature, then add cinnamic acid and p-toluenesulfonic acid, and react at 60 - 80 °C for 4 - 12 h under nitrogen protection, cool, wash, distill under reduced pressure, and vacuum dry for 6 h to obtain the modified antibacterial agent;

[0025] Furthermore, the dosage ratio of the intermediate, dimethyl sulfoxide, cinnamic acid, and p-toluenesulfonic acid is 0.01 - 0.02 mol : 5 - 10 mL : 0.01 - 0.02 mol : 0.02 - 0.17 g;

[0026] Finally, utilize the reaction between the hydroxyl group of the intermediate and the carboxyl group of cinnamic acid to obtain the modified antibacterial agent.

[0027] A preparation method of a thermoplastic elastomer material specifically includes the following steps:

[0028] S1. Put SEBS, SBS, plasticizer, polylactic acid, compatibilizer, antioxidant, modified flame retardant, and modified antibacterial agent into a high-speed mixer and mix for 10 - 20 min to obtain a mixed material;

[0029] S2. Put the mixed material into a twin-screw extruder, extrude, and pelletize to obtain the thermoplastic elastomer material. The rotation speed is 300 - 500 rpm, and the temperatures of each zone of the twin-screw extruder are: zone 1: 200 - 250 °C, zone 2: 200 - 280 °C, zone 3: 200 - 280 °C, zone 4: 200 - 260 °C, zone 5: 200 - 260 °C, zone 6: 200 - 260 °C, zone 7: 200 - 260 °C, and the feeding port: 220 °C.

[0030] Advantages of the present invention:

[0031] The thermoplastic elastomer material of the present invention has good flame retardant effect, and at the same time also has excellent antibacterial effect, which prolongs the service life of the material.

[0032] In the modified flame retardant prepared by the present invention, pentaerythritol phosphate achieves efficient flame retardancy by promoting char formation, diluting combustible gases, and isolating oxygen and heat. The incombustible gases generated by its decomposition form an expansive char layer, isolating oxygen and heat, and promoting the dehydration and carbonization of the thermoplastic elastomer to form a stable carbon layer. At the same time, the phosphorus element in pentaerythritol phosphate synergizes with phenylphosphoryl dichloride to form phosphate compounds during combustion, constructing a dense protective layer on the material surface to inhibit flame spread. In addition, when the modified flame retardant degrades, a -Si-O- crosslinking system is formed, effectively preventing the escape of combustion products and inhibiting the thermal degradation of polymer materials, achieving low-smoke flame retardancy. In addition, the phosphorus-nitrogen flame retardant 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, as a phosphaphenanthrene compound with high thermal stability, promotes the formation of a dense and continuous carbon layer during combustion, isolating oxygen and heat, and synergizing with the phosphorus-oxygen double bond to enhance the flame retardant effect and extend the service life. In addition, the modified flame retardant prepared by the present invention is halogen-free, which helps to reduce environmental pollution and damage to the ecosystem, is harmless to human health, and realizes sustainable development.

[0033] The modified antibacterial agent prepared by the present invention has excellent antibacterial effects. The quaternary ammonium salt intermediate can penetrate the bacterial cell wall and react with the proteins on the bacterial cell membrane, resulting in membrane rupture, leakage of intracellular proteins, and accelerated bacterial death, thereby improving the antibacterial effect. At the same time, the positive charge of the quaternary ammonium salt intermediate interacts with the negative charge of the microbial cell membrane, disturbing the surface charge distribution of bacteria and destroying the integrity of the cell membrane, thereby hindering the synthesis of bacterial proteins. At the same time, the introduced cinnamic acid can inhibit the metabolic enzyme activity of microorganisms, block protein synthesis, and destroy the cell structure in bacteria, effectively inhibiting the reproduction of bacteria and inactivating them, endowing the material with antibacterial ability, and thus extending the service life of the material. Detailed implementation manners

[0034] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0035] Example 1: A preparation method of a thermoplastic elastomer material specifically includes the following steps:

[0036] S1. Weigh the raw materials by weight parts: 10 parts of SEBS, 15 parts of SBS, 5 parts of plasticizer, 25 parts of polylactic acid, 2 parts of compatibilizer, 0.1 part of antioxidant, 2 parts of modified flame retardant (prepared in this example), and 1 part of modified antibacterial agent (prepared in this example); Put SEBS, SBS, polycaprolactone, polylactic acid, SBS-g-GMA, antioxidant 168, modified flame retardant, and modified antibacterial agent into a high-speed mixer and mix for 10 min to obtain a mixed material;

[0037] S2. Put the mixed material into a twin-screw extruder, extrude and pelletize to obtain a thermoplastic elastomer material. The rotation speed is 300 rpm. The temperatures of each zone of the twin-screw extruder are: 200 °C in zone 1, 200 °C in zone 2, 200 °C in zone 3, 200 °C in zone 4, 200 °C in zone 5, 200 °C in zone 6, 200 °C in zone 7, and 220 °C at the feeding port;

[0038] The modified flame retardant is prepared by the following method:

[0039] Step A1: Mix 20 mL of glacial acetic acid and 50 mL of deionized water evenly, heat up to 60 °C, slowly dropwise add 0.1 mol of methylvinyl dimethoxysilane, control the dropping time to be 15 min. After dropping, stir at 60 °C for 1 h, cool to room temperature, filter, and then add 0.2 mol of phenylphosphoryl dichloride and 20 mL of triethylamine and mix evenly, react for 10 h, filter by suction, and dry to obtain a compound;

[0040] Step A2: Mix 0.1 mol of the compound, 0.2 mol of pentaerythritol phosphate, and 15 mL of triethylamine evenly, first react at 120 °C for 3 h, and then react at 150 °C for 3 h. After the reaction is completed, filter by suction, distill under reduced pressure, and dry in vacuum to obtain an intermediate product;

[0041] Step A3: Mix 0.1 mol of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, 20 mL of N,N-dimethylformamide, and 0.1 mol of the intermediate product evenly, stir at 140 °C for 9 h, filter and wash, and dry in vacuum at 60 °C for 24 h to obtain the modified flame retardant;

[0042] The modified antibacterial agent is prepared by the following method:

[0043] Step B1: Mix 0.01 mol of 1,3-dichloroisopropanol, 0.02 mol of trimethylamine, and 50 mL of ethanol evenly, stir and react at 50 °C for 72 h. After the reaction is completed, perform rotary evaporation, washing, filter by suction, and dry in vacuum at 40 °C for 4 h to obtain an intermediate;

[0044] Step B2: Mix 0.01 mol of the intermediate and 5 mL of dimethyl sulfoxide evenly, stir in a water bath at 45 °C, cool to room temperature, then add 0.01 mol of cinnamic acid and 0.02 g of p-toluenesulfonic acid, react at 60 °C for 4 h under nitrogen protection, cool, wash, distill under reduced pressure, and dry in vacuum for 6 h to obtain the modified antibacterial agent.

[0045] Example 2: A preparation method of a thermoplastic elastomer material specifically includes the following steps:

[0046] S1. Weigh the raw materials by weight parts: 15 parts of SEBS, 20 parts of SBS, 12.5 parts of plasticizer, 30 parts of polylactic acid, 4 parts of compatibilizer, 0.2 part of antioxidant, 6 parts of modified flame retardant (prepared by this example), and 2 parts of modified antibacterial agent (prepared by this example); put SEBS, SBS, polycaprolactone, polylactic acid, SBS-g-GMA, antioxidant 168, modified flame retardant, and modified antibacterial agent into a high-speed mixer and mix for 15 min to obtain a mixed material;

[0047] S2. Put the mixed material into a twin-screw extruder, extrude and pelletize to obtain a thermoplastic elastomer material. The rotation speed is 400 rpm, and the temperatures of each zone of the twin-screw extruder are: 225 °C in zone 1, 240 °C in zone 2, 240 °C in zone 3, 230 °C in zone 4, 230 °C in zone 5, 230 °C in zone 6, 230 °C in zone 7, and 220 °C at the feeding port;

[0048] The modified flame retardant is prepared by the following method:

[0049] Step A1: Mix 25 mL of glacial acetic acid and 50 mL of deionized water evenly, heat up to 70 °C, slowly dropwise add 0.15 mol of methylvinyldimethoxysilane, control the dropping time to be 15 min. After the dropping is completed, stir at a constant temperature of 70 °C for 2.5 h, cool to room temperature, filter, then add 0.3 mol of phenylphosphoryl dichloride and 30 mL of triethylamine and mix evenly, react for 10 h, carry out suction filtration and drying to obtain a compound;

[0050] Step A2: Mix 0.15 mol of the compound, 0.3 mol of pentaerythritol phosphate ester, and 15 mL of triethylamine evenly, first react at 120 °C for 3 h, then react at 150 °C for 3 h. After the reaction is completed, carry out suction filtration, distill under reduced pressure, and dry in vacuum to obtain an intermediate product;

[0051] Step A3: Mix 0.15 mol of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, 35 mL of N,N-dimethylformamide, and 0.15 mol of the intermediate product evenly, stir at 145 °C for 9 h, filter and wash, and dry in vacuum at 60 °C for 24 h to obtain the modified flame retardant;

[0052] The modified antibacterial agent is prepared by the following method:

[0053] Step B1: Mix 0.015 mol of 1,3-dichloroisopropanol, 0.03 mol of trimethylamine and 75 mL of ethanol evenly, stir and react at 50 °C for 72 h. After the reaction, perform rotary evaporation, washing, suction filtration, and vacuum dry at 40 °C for 4 h to obtain an intermediate.

[0054] Step B2: Mix 0.015 mol of the intermediate and 7.5 mL of dimethyl sulfoxide evenly, stir in a water bath at 52 °C, cool to room temperature, then add 0.015 mol of cinnamic acid and 0.02 - 0.17 g of p-toluenesulfonic acid, react at 70 °C for 8 h under nitrogen protection, cool, wash, perform vacuum distillation, and vacuum dry for 6 h to obtain a modified antibacterial agent.

[0055] Example 3: A preparation method of a thermoplastic elastomer material specifically includes the following steps:

[0056] S1. Weigh raw materials by weight parts: 20 parts of SEBS, 25 parts of SBS, 20 parts of plasticizer, 35 parts of polylactic acid, 6 parts of compatibilizer, 0.3 part of antioxidant, 10 parts of modified flame retardant (prepared by this example), 3 parts of modified antibacterial agent (prepared by this example); put SEBS, SBS, polycaprolactone, polylactic acid, SBS-g-GMA, antioxidant 168, modified flame retardant and modified antibacterial agent into a high-speed mixer and mix for 20 min to obtain a mixed material.

[0057] S2. Put the mixed material into a twin-screw extruder, extrude and pelletize to obtain a thermoplastic elastomer material. The rotation speed is 500 rpm, and the temperatures of each zone of the twin-screw extruder are: zone 1 at 250 °C, zone 2 at 280 °C, zone 3 at 280 °C, zone 4 at 260 °C, zone 5 at 260 °C, zone 6 at 260 °C, zone 7 at 260 °C, and the feeding port at 220 °C.

[0058] The modified flame retardant is prepared by the following method:

[0059] Step A1: Mix 30 mL of glacial acetic acid and 50 mL of deionized water evenly, heat up to 80 °C, slowly dropwise add 0.2 mol of methylvinyldimethoxysilane, control the dropping time to be 15 min. After the dropping is completed, stir at a constant temperature of 80 °C for 4 h, cool to room temperature, filter, then add 0.4 mol of phenylphosphoryl dichloride and 40 mL of triethylamine and mix evenly, react for 10 h, perform suction filtration and drying to obtain a compound.

[0060] Step A2: Mix 0.2 mol of the compound, 0.4 mol of pentaerythritol phosphate and 15 mL of triethylamine evenly, first react at 120 °C for 3 h, then react at 150 °C for 3 h. After the reaction is completed, perform suction filtration, vacuum distillation, and vacuum drying to obtain an intermediate product.

[0061] Step A3: Mix 0.2 mol of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, 50 mL of N,N-dimethylformamide, and 0.2 mol of the intermediate uniformly, stir at 150 °C for 9 h, filter, wash, and dry in vacuum at 60 °C for 24 h to obtain the modified flame retardant;

[0062] The modified antibacterial agent is prepared by the following method:

[0063] Step B1: Mix 0.02 mol of 1,3-dichloroisopropanol, 0.04 mol of trimethylamine, and 100 mL of ethanol uniformly, stir and react at 50 °C for 72 h. After the reaction, perform rotary evaporation, washing, suction filtration, and dry in vacuum at 40 °C for 4 h to obtain the intermediate;

[0064] Step B2: Mix 0.02 mol of the intermediate and 10 mL of dimethyl sulfoxide uniformly, stir in a water bath at 60 °C, cool to room temperature, then add 0.02 mol of cinnamic acid and 0.17 g of p-toluenesulfonic acid, react at 80 °C for 12 h under nitrogen protection, cool, wash, perform vacuum distillation, and dry in vacuum for 6 h to obtain the modified antibacterial agent.

[0065] Comparative Example 1: This comparative example is a thermoplastic elastomer material. The difference from Example 3 is that an equal amount of magnesium hydroxide is used to replace the modified flame retardant prepared in Example 3, and the rest are the same.

[0066] Comparative Example 2: This comparative example is a thermoplastic elastomer material. The difference from Example 3 is that an equal amount of silver salt antibacterial agent is used to replace the modified antibacterial agent prepared in Example 3, and the rest are the same.

[0067] Performance test: Cut the thermoplastic elastomer materials prepared in Examples 1-3 and Comparative Examples 1-2 into standard test sizes, and test the flame retardancy according to GB / T 10707-2008; Add a Staphylococcus aureus bacterial solution with a concentration of 2x10 8 CFU / mL as the test strain into a sterilized culture dish, then add and melt the solid agar medium, and then cool to 45 °C, and then pour it into the culture dish. Pour 20 mL into each petri dish with an inner diameter of 10 cm. Then place the thermoplastic elastomer materials (with a diameter of 8 cm and a thickness of 1 mm) prepared in Examples 1-3 and Comparative Examples 1-2 on the culture medium plate, and culture in a constant temperature incubator for 12 h at a temperature of 37 °C. After culturing, measure the diameter of the antibacterial zone; The test results are shown in Table 1 below:

[0068] Table 1

[0069] Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Vertical burning rating V-1 V-1 V-1 V-2 V-1 Diameter of antibacterial zone mm 16.5 16.2 15.9 15.8 11.7

[0070] As can be seen from the data tested in Table 1, the thermoplastic elastomer material prepared by the present invention has good flame retardant effect. It can also be seen from Table 1 that the diameter of the antibacterial zone of the thermoplastic elastomer material prepared by the present invention reaches 15.9 - 16.5 mm, indicating good antibacterial effect and extending the service life of the material.

[0071] The above content is only an example and illustration of the concept of the present invention. Those skilled in the art of the present technology can make various modifications or supplements to the described specific embodiments or use similar ways to replace them. As long as they do not deviate from the concept of the invention or exceed the scope defined by this claim book, they should all belong to the protection scope of the present invention.

Claims

1. A method for preparing a thermoplastic elastomer material, characterized in that Specifically, it includes the following steps: S1. Weigh the raw materials by weight parts. Put 10 - 20 parts of SEBS, 15 - 25 parts of SBS, 5 - 20 parts of plasticizer, 25 - 35 parts of polylactic acid, 2 - 6 parts of compatibilizer, 0.1 - 0.3 parts of antioxidant, 2 - 10 parts of modified flame retardant, and 1 - 3 parts of modified antibacterial agent into a high - speed mixer and mix for 10 - 20 min to obtain a mixed material. S2. Put the mixed material into a twin - screw extruder, extrude and pelletize to obtain a thermoplastic elastomer material. The rotation speed is 300 - 500 rpm. The temperatures of each zone of the twin - screw extruder are: the first zone is 200 - 250 °C, the second zone is 200 - 280 °C, the third zone is 200 - 280 °C, the fourth zone is 200 - 260 °C, the fifth zone is 200 - 260 °C, the sixth zone is 200 - 260 °C, the seventh zone is 200 - 260 °C, and the feeding port is 220 °C. The modified flame retardant is prepared by the following method: Step A1: Mix glacial acetic acid and deionized water evenly, heat up to 60 - 80 °C, slowly dropwise add methylvinyldimethoxysilane, control the dropping time to be 15 min. After the dropping is completed, stir at a constant temperature of 60 - 80 °C for 1 - 4 h, cool to room temperature, filter, then add phenylphosphoryl dichloride and triethylamine and mix evenly, react for 10 h, carry out suction filtration, dry to obtain a compound. Step A2: Mix the compound, pentaerythritol phosphate ester and triethylamine evenly, first react at 120 °C for 3 h, then react at 150 °C for 3 h. After the reaction is completed, carry out suction filtration, vacuum distillation, and vacuum drying to obtain an intermediate product. Step A3: Mix 9,10 - dihydro - 9 - oxa - 10 - phosphaphenanthrene - 10 - oxide, N,N - dimethylformamide and the intermediate product evenly, stir at 140 - 150 °C for 9 h, filter and wash, and vacuum dry at 60 °C for 24 h to obtain the modified flame retardant.

2. The preparation method of a thermoplastic elastomer material according to claim 1, characterized in that, In step A1, the dosage ratio of glacial acetic acid, deionized water, methylvinyldimethoxysilane, phenylphosphoryl dichloride, and triethylamine is 20 - 30 mL:50 mL:0.1 - 0.2 mol:0.2 - 0.4 mol:20 - 40 mL.

3. The preparation method of a thermoplastic elastomer material according to claim 1, characterized in that, In step A2, the dosage ratio of the compound, pentaerythritol phosphate ester, and triethylamine is 0.1 - 0.2 mol:0.2 - 0.4 mol:15 mL.

4. The preparation method of a thermoplastic elastomer material according to claim 1, characterized in that, In step A3, the dosage ratio of 9,10 - dihydro - 9 - oxa - 10 - phosphaphenanthrene - 10 - oxide, N,N - dimethylformamide, and the intermediate product is 0.1 - 0.2 mol:20 - 50 mL:0.1 - 0.2 mol.

5. The preparation method of a thermoplastic elastomer material according to claim 1, characterized in that, The modified antibacterial agent is prepared by the following method: Step B1: Mix 1,3 - dichloroisopropanol, trimethylamine and ethanol evenly, stir and react at 50 °C for 72 h. After the reaction is completed, carry out rotary evaporation, washing, suction filtration, and vacuum dry at 40 °C for 4 h to obtain an intermediate. Step B2: Mix the intermediate and dimethyl sulfoxide evenly, stir in a water bath at 45 - 60 °C, cool to room temperature, then add cinnamic acid and p - toluenesulfonic acid, react at 60 - 80 °C for 4 - 12 h under nitrogen protection, cool, wash, carry out vacuum distillation, and vacuum dry for 6 h to obtain the modified antibacterial agent.

6. The preparation method of a thermoplastic elastomer material according to claim 5, characterized in that, In step B1, the dosage ratio of 1,3-dichloroisopropanol, trimethylamine, and ethanol is 0.01 - 0.02 mol : 0.02 - 0.04 mol : 50 - 100 mL.

7. The preparation method of a thermoplastic elastomer material according to claim 5, characterized in that, In step B2, the dosage ratio of the intermediate, dimethyl sulfoxide, cinnamic acid, and p-toluenesulfonic acid is 0.01 - 0.02 mol : 5 - 10 mL : 0.01 - 0.02 mol : 0.02 - 0.17 g.

8. The preparation method of a thermoplastic elastomer material according to claim 1, characterized in that, The plasticizer is polycaprolactone, the compatibilizer is SBS-g-GMA, and the antioxidant is antioxidant 168.

9. A thermoplastic elastomer material, characterized in that, Prepared according to the preparation method described in any one of claims 1 - 8.