High-temperature-resistant flame-retardant protective shoes and preparation method thereof

Abstract

The invention relates to a high-temperature-resistant flame-retardant protective shoe and a preparation method thereof, and belongs to the technical field of labor protection products. The preparation method comprises the following steps: taking butadiene styrene rubber, silicon rubber, stearic acid, carbon black, zinc oxide, sulfur, a peptizer, an accelerant CZ, an accelerant DM, an initiator and a self-made flame-retardant heat-resistant agent as raw materials; firstly, performing open milling on the butadiene styrene rubber and the peptizer in an open mill to reduce the molecular weight of the butadiene styrene rubber; mixing and grafting styrene-butadiene rubber and a flame-retardant heat-resistant agent under the action of an initiator, adding the rest raw materials in batches, mixing, calendering to obtain a raw rubber sheet, vulcanizing the raw rubber sheet to serve as a material of a sole and a vamp, and finally bonding and sewing base cloth to obtain the high-temperature-resistant flame-retardant protective shoe. The protective shoe has good mechanical performance, tear resistance, wear resistance, chemical corrosion resistance and aging resistance, the flame-retardant and heat-resistant agent is added into the raw materials, the heat resistance and flame retardance of the shoe base material are improved, and safety is good.

Description

Technical Field

[0001] The invention belongs to the technical field of labor protection products, and in particular, relates to a high temperature resistant and flame retardant protective shoe and a preparation method thereof. Background Art

[0002] Protective shoes are a type of personal protective equipment specially designed for use in high-temperature working environments, designed to protect the user's feet from hazards such as high temperature, thermal radiation, sparks, and molten metal splashes. This type of protective shoes is widely used in special industries such as metallurgy, casting, welding, and firefighting, and is an important piece of equipment to ensure the safety of workers.

[0003] Protective shoes not only need to withstand high temperatures, but also need to have flame retardant properties. Although flame retardants are added to the raw materials in the prior art, the flame retardants are easily unevenly mixed during the mixing process of rubber protective shoes, resulting in poor flame retardant effects. In addition, small molecule flame retardants may migrate and fail as the use time increases. In addition, the heat resistance of protective shoes is still defective. In an extreme high temperature environment with a temperature above 300°C, the material will decompose rapidly, causing the upper to soften or melt, resulting in a decrease in protective performance. Based on this, the present invention provides a high temperature resistant flame retardant protective shoe and a preparation method thereof. Summary of the invention

[0004] The object of the present invention is to provide a high temperature resistant flame retardant protective shoe and a preparation method thereof, so as to solve the problems mentioned in the above background technology.

[0005] The purpose of the present invention can be achieved by the following technical solutions: A high temperature resistant flame retardant protective shoe, comprising the following raw materials: 100 parts of styrene butadiene rubber, 15-25 parts of silicone rubber, 2-3 parts of stearic acid, 20-30 parts of carbon black, 3.6-4.8 parts of zinc oxide, 1.6-2.4 parts of sulfur, 0.5-1.5 parts of peptizer, 1.2-1.5 parts of accelerator CZ, 0.4-0.6 parts of accelerator DM, 0.1-0.3 parts of initiator, and 6-8 parts of flame retardant and heat resistant agent; A method for preparing high temperature resistant flame retardant protective shoes comprises the following steps: The first step is to weigh the raw materials by mass: 100 parts of styrene-butadiene rubber, 15-25 parts of silicone rubber, 2-3 parts of stearic acid, 20-30 parts of carbon black, 3.6-4.8 parts of zinc oxide, 1.6-2.4 parts of sulfur, 0.5-1.5 parts of peptizer, 1.2-1.5 parts of accelerator CZ, 0.4-0.6 parts of accelerator DM, 0.1-0.3 parts of initiator, and 6-8 parts of flame retardant and heat resistant agent; Step 2: Add styrene-butadiene rubber and peptizer into the open mill, and place the mixture for 24 hours after the roll milling to obtain styrene-butadiene rubber internal mixing rubber for use; The third step is to add styrene-butadiene rubber internal mixer, initiator, flame retardant and heat resistant agent into the internal mixer for mixing, then add silicone rubber, stearic acid, carbon black and zinc oxide into the internal mixer, thinly pass and make triangle packages 4-6 times, finally add sulfur, accelerator CZ and accelerator DM into the internal mixer, thinly pass and make triangle packages 4-6 times to obtain the mixed rubber, cool the mixed rubber and place it for 24 hours before calendering to obtain the raw rubber sheet; Step 4: vulcanize the raw rubber sheet to obtain the sole material and the upper material, bond and sew the base cloth to the upper material, bond, sew and cut the base cloth to the sole material to obtain a high temperature resistant flame retardant protective shoe.

[0006] Furthermore, the peptizer is 2,2-dibenzamidodiphenyl disulfide.

[0007] Furthermore, the initiator is benzoyl peroxide.

[0008] Furthermore, the model of the carbon black is N330.

[0009] Furthermore, in the second step, the roller temperature of the mixing mill is set to 50-70° C., and the mixing time is 10-15 min.

[0010] Furthermore, in the third step, the temperature of the internal mixer is set to 130-150° C., and the mixing time is 8-12 min.

[0011] Furthermore, the flame retardant and heat resistant agent is prepared by the following steps: Step 1, 1-(3,5-dimethylphenyl)-1H-pyrrole-2,5-dione, N-bromosuccinimide and chloroform were mixed in a three-necked flask, a condenser and a thermometer were installed, magnetic stirring was turned on, the system temperature was raised to 40-50°C, benzoyl peroxide was added to the three-necked flask, and the reaction was continued at a temperature of 40-50°C for 3-4h. After the reaction was completed, the insoluble solid was removed by filtration, and the remaining reaction solution was evaporated to remove the solvent to obtain intermediate 1; Step 2, trimethyl phosphite, aniline, potassium carbonate and dichloromethane were mixed in a three-necked flask, and magnetic stirring was started. Then iodine was added to the three-necked flask, and the mixture was reacted at room temperature for 30 minutes. After the reaction was completed, deionized water was added to the three-necked flask, and the organic layer was separated with a separatory funnel. The organic layer was evaporated to remove the solvent to obtain intermediate 2; Step 3: Mix intermediate 1, intermediate 2, sodium hydroxide and ethanol in a three-necked flask, install a condenser and a thermometer, turn on the magnetic stirring, and react at a temperature of 70-75°C for 24 hours. After the reaction is completed, filter out the insoluble solid, and evaporate the remaining reaction liquid to remove the solvent and then chromatograph on a silica gel column to obtain the flame retardant and heat-resistant agent.

[0012] Furthermore, the amount ratio of 1-(3,5-dimethylphenyl)-1H-pyrrole-2,5-dione, N-bromosuccinimide, chloroform and benzoyl peroxide used in step 1 is 10 mmol: 20 mmol: 20-30 mL: 0.2-0.4 g.

[0013] Furthermore, the amount ratio of trimethyl phosphite, aniline, potassium carbonate, dichloromethane and iodine used in step 2 is 16-20mmol:20mmol:20mmol:40-50mL:20mmol.

[0014] Furthermore, the usage ratio of intermediate 1, intermediate 2, sodium hydroxide and ethanol used in step 3 is 5-6 mmol: 10 mmol: 0.5-0.6 g: 30-40 mL.

[0015] Beneficial effects of the present invention: The invention uses styrene-butadiene rubber, silicone rubber, stearic acid, carbon black, zinc oxide, sulfur, a peptizer, an accelerator CZ, an accelerator DM, an initiator and a self-made flame retardant and heat-resistant agent as raw materials. The invention firstly reduces the molecular weight of the styrene-butadiene rubber by refining the styrene-butadiene rubber and the peptizer in an open mill, then mixes and grafts the styrene-butadiene rubber and the flame retardant and heat-resistant agent under the action of the initiator, then adds the remaining raw materials in batches, mixes and calenders to obtain a raw rubber sheet, and vulcanizes the raw rubber sheet to use it as the material of the sole and the upper, and finally adheres and sews the base cloth to obtain a high-temperature resistant flame retardant protective shoe. The protective shoe of the invention improves the overall mechanical property, wear resistance and tear resistance by blending carbon black, and has good aging resistance and chemical corrosion resistance after vulcanization.

[0016] The invention uses 1-(3,5-dimethylphenyl)-1H-pyrrole-2,5-dione as a raw material and N-succinimide as a brominating agent, and a halogenation reaction is carried out under the action of an initiator benzoyl peroxide to obtain an intermediate 1. At the same time, trimethyl phosphite and aniline are used as raw materials, and an amidation reaction is carried out under the action of iodine and potassium carbonate to obtain an intermediate 2. Finally, the intermediate 1 and the intermediate 2 are used as raw materials, and a nucleophilic substitution reaction is carried out under alkaline conditions to obtain a flame retardant and heat-resistant agent. The flame retardant and heat-resistant agent of the invention has a polymerizable double bond in its structure, and can undergo a copolymerization reaction with styrene-butadiene rubber to modify the styrene-butadiene rubber. Styrene-butadiene rubber has good compatibility and is not prone to migration. There are a large number of benzene rings and heterocyclic structures in the flame retardant and heat-resistant agent, which can be embedded in the polymer molecular chain after polymerization, increase the internal rotation resistance of the polymer main chain, improve the rigidity of the polymer molecular chain, and inhibit the thermal motion of the chain segment, thereby improving the heat resistance of the material. In addition, the flame retardant and heat-resistant agent of the present invention also has a double-ended phosphate ester structure, which can be thermally decomposed to produce non-combustible gas when exposed to high temperature of flame, reduce the concentration of combustible gas, prevent combustion, and produce phosphoric acid substances to promote dehydration of the polymer matrix to produce a protective carbon layer, isolate oxygen, and thus play a flame retardant role.

[0017] The high-temperature resistant flame-retardant protective shoes of the present invention have good mechanical properties and tear resistance, good wear resistance, good chemical corrosion resistance and anti-aging performance, and homemade flame retardant and heat-resistant agents are added to the raw materials to improve the heat resistance and flame retardant properties of the shoe base material, and have good safety. DETAILED DESCRIPTION

[0018] 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. Example

[0019] A flame retardant and heat resistant agent is prepared by the following steps: Step 1, 10mmol 1-(3,5-dimethylphenyl)-1H-pyrrole-2,5-dione, 20mmol N-bromosuccinimide, and 20mL chloroform were mixed in a three-necked flask, a condenser and a thermometer were installed, magnetic stirring was turned on, the system temperature was raised to 40°C, 0.2g benzoyl peroxide was added to the three-necked flask, and the reaction was continued at 40°C for 3h. After the reaction was completed, the insoluble solid was removed by filtration, and the solvent was removed by rotary evaporation of the remaining reaction solution to obtain intermediate 1; Step 2, 16mmol trimethyl phosphite, 20mmol aniline, 20mmol potassium carbonate, and 40mL dichloromethane were mixed in a three-necked flask, and magnetic stirring was turned on. Then, 20mmol iodine was added to the three-necked flask, and the mixture was reacted at room temperature for 30min. After the reaction was completed, deionized water was added to the three-necked flask, and the organic layer was separated with a separatory funnel. The organic layer was evaporated to remove the solvent to obtain intermediate 2; Step 3, 5mmol intermediate 1, 10mmol intermediate 2, 0.5g sodium hydroxide, 30mL ethanol were mixed in a three-necked flask, equipped with a condenser and a thermometer, turned on the magnetic stirring, and reacted at a temperature of 70°C for 24h. After the reaction was completed, the insoluble solid was filtered out, the remaining reaction liquid was evaporated to remove the solvent and then subjected to silica gel column chromatography to obtain the flame retardant and heat-resistant agent. Example

[0020] A flame retardant and heat resistant agent is prepared by the following steps: Step 1, 10mmol 1-(3,5-dimethylphenyl)-1H-pyrrole-2,5-dione, 20mmol N-bromosuccinimide, and 25mL chloroform were mixed in a three-necked flask, a condenser and a thermometer were installed, magnetic stirring was turned on, the system temperature was raised to 45°C, 0.3g benzoyl peroxide was added to the three-necked flask, and the reaction was continued at 45°C for 3.5h. After the reaction was completed, the insoluble solid was removed by filtration, and the remaining reaction solution was evaporated to remove the solvent to obtain intermediate 1; Step 2, 18 mmol trimethyl phosphite, 20 mmol aniline, 20 mmol potassium carbonate, and 45 mL dichloromethane were mixed in a three-necked flask, and magnetic stirring was turned on. Then, 20 mmol iodine was added to the three-necked flask, and the mixture was reacted at room temperature for 30 min. After the reaction was completed, deionized water was added to the three-necked flask, and the organic layer was separated with a separatory funnel. The organic layer was evaporated to remove the solvent to obtain intermediate 2; Step 3, 5.5mmol intermediate 1, 10mmol intermediate 2, 0.55g sodium hydroxide, 35mL ethanol were mixed in a three-necked flask, equipped with a condenser and a thermometer, turned on the magnetic stirring, and reacted at 73°C for 24h. After the reaction was completed, the insoluble solid was filtered out, the remaining reaction liquid was evaporated to remove the solvent and then subjected to silica gel column chromatography to obtain the flame retardant and heat-resistant agent. Example

[0021] A flame retardant and heat resistant agent is prepared by the following steps: Step 1, 10mmol 1-(3,5-dimethylphenyl)-1H-pyrrole-2,5-dione, 20mmol N-bromosuccinimide, and 30mL chloroform were mixed in a three-necked flask, a condenser and a thermometer were installed, magnetic stirring was turned on, the system temperature was raised to 50°C, 0.3g benzoyl peroxide was added to the three-necked flask, and the reaction was continued at 50°C for 4h. After the reaction was completed, the insoluble solid was filtered out, and the solvent was removed by rotary evaporation of the remaining reaction solution to obtain intermediate 1; Step 2, 20mmol trimethyl phosphite, 20mmol aniline, 20mmol potassium carbonate, and 50mL dichloromethane were mixed in a three-necked flask, and magnetic stirring was turned on. Then, 20mmol iodine was added to the three-necked flask, and the mixture was reacted at room temperature for 30min. After the reaction was completed, deionized water was added to the three-necked flask, and the organic layer was separated with a separatory funnel. The organic layer was evaporated to remove the solvent to obtain intermediate 2; Step 3: Mix 6 mmol of intermediate 1, 10 mmol of intermediate 2, 0.6 g of sodium hydroxide and 40 mL of ethanol in a three-necked flask, install a condenser and a thermometer, turn on the magnetic stirring, and react at 75°C for 24 hours. After the reaction is completed, filter out the insoluble solid, and evaporate the remaining reaction liquid to remove the solvent, then chromatograph on a silica gel column to obtain the flame retardant and heat-resistant agent. Example

[0022] A high temperature resistant flame retardant protective shoe, comprising the following raw materials: 100 parts of styrene butadiene rubber, 15 parts of silicone rubber, 2 parts of stearic acid, 20 parts of N330 carbon black, 3.6 parts of zinc oxide, 1.6 parts of sulfur, 0.5 parts of 2,2-dibenzamido diphenyl disulfide, 1.2 parts of accelerator CZ, 0.4 parts of accelerator DM, 0.1 parts of benzoyl peroxide, and 6 parts of the flame retardant and heat resistant agent obtained in Example 1; A method for preparing high temperature resistant flame retardant protective shoes comprises the following steps: The first step is to weigh the raw materials by mass: 100 parts of styrene-butadiene rubber, 15 parts of silicone rubber, 2 parts of stearic acid, 20 parts of N330 carbon black, 3.6 parts of zinc oxide, 1.6 parts of sulfur, 0.5 parts of 2,2-dibenzamido diphenyl disulfide, 1.2 parts of accelerator CZ, 0.4 parts of accelerator DM, 0.1 parts of benzoyl peroxide, and 6 parts of the flame retardant and heat-resistant agent obtained in Example 1; Step 2: Add styrene-butadiene rubber and 2,2-dibenzamido diphenyl disulfide into an open mill, set the roller temperature to 50°C, roll and grind for 10 minutes, then place for 24 hours to obtain styrene-butadiene rubber internal compound for use; Step 3: Add styrene-butadiene rubber internal mixer, benzoyl peroxide, and the flame retardant and heat-resistant agent obtained in Example 1 into an internal mixer, set the temperature of the internal mixer to 130° C., mix for 8 minutes, add silicone rubber, stearic acid, N330 carbon black, and zinc oxide into the internal mixer, thin it and make triangle packages 4 times, finally add sulfur, accelerator CZ, and accelerator DM into the internal mixer, thin it and make triangle packages 4 times to obtain a mixed rubber, cool the mixed rubber and place it for 24 hours, then calender to obtain a raw rubber sheet; Step 4: vulcanize the raw rubber sheet to obtain the sole material and the upper material, bond and sew the base cloth to the upper material, bond, sew and cut the base cloth to the sole material to obtain a high temperature resistant flame retardant protective shoe. Example

[0023] A high temperature resistant flame retardant protective shoe, comprising the following raw materials: 100 parts of styrene butadiene rubber, 20 parts of silicone rubber, 2.5 parts of stearic acid, 25 parts of N330 carbon black, 4.2 parts of zinc oxide, 2 parts of sulfur, 1 part of 2,2-dibenzamido diphenyl disulfide, 1.35 parts of accelerator CZ, 0.5 parts of accelerator DM, 0.2 parts of benzoyl peroxide, and 7 parts of the flame retardant and heat resistant agent obtained in Example 2; A method for preparing high temperature resistant flame retardant protective shoes comprises the following steps: The first step is to weigh the raw materials by mass: 100 parts of styrene-butadiene rubber, 20 parts of silicone rubber, 2.5 parts of stearic acid, 25 parts of N330 carbon black, 4.2 parts of zinc oxide, 2 parts of sulfur, 1 part of 2,2-dibenzamido diphenyl disulfide, 1.35 parts of accelerator CZ, 0.5 parts of accelerator DM, 0.2 parts of benzoyl peroxide, and 7 parts of the flame retardant and heat-resistant agent obtained in Example 2; Step 2: Add styrene-butadiene rubber and 2,2-dibenzamido diphenyl disulfide into an open mill, set the roller temperature to 60°C, roll and grind for 12.5 minutes, then place for 24 hours to obtain styrene-butadiene rubber internal compound for use; Step 3: Add styrene-butadiene rubber internal mixer, benzoyl peroxide, and the flame retardant and heat-resistant agent obtained in Example 2 into an internal mixer, set the temperature of the internal mixer to 140° C., mix for 10 minutes, add silicone rubber, stearic acid, N330 carbon black, and zinc oxide into the internal mixer, thin it and make triangle packages 5 times, finally add sulfur, accelerator CZ, and accelerator DM into the internal mixer, thin it and make triangle packages 5 times to obtain a mixed rubber, cool the mixed rubber and place it for 24 hours, then calender to obtain a raw rubber sheet; Step 4: vulcanize the raw rubber sheet to obtain the sole material and the upper material, bond and sew the base cloth to the upper material, bond, sew and cut the base cloth to the sole material to obtain a high temperature resistant flame retardant protective shoe. Example

[0024] A high temperature resistant flame retardant protective shoe, comprising the following raw materials: 100 parts of styrene butadiene rubber, 25 parts of silicone rubber, 3 parts of stearic acid, 30 parts of N330 carbon black, 4.8 parts of zinc oxide, 2.4 parts of sulfur, 1.5 parts of 2,2-dibenzamido diphenyl disulfide, 1.5 parts of accelerator CZ, 0.6 parts of accelerator DM, 0.3 parts of benzoyl peroxide, and 8 parts of the flame retardant and heat resistant agent obtained in Example 3; A method for preparing high temperature resistant flame retardant protective shoes comprises the following steps: The first step is to weigh the raw materials by mass: 100 parts of styrene-butadiene rubber, 25 parts of silicone rubber, 3 parts of stearic acid, 30 parts of N330 carbon black, 4.8 parts of zinc oxide, 2.4 parts of sulfur, 1.5 parts of 2,2-dibenzamido diphenyl disulfide, 1.5 parts of accelerator CZ, 0.6 parts of accelerator DM, 0.3 parts of benzoyl peroxide, and 8 parts of the flame retardant and heat-resistant agent obtained in Example 3; Step 2: Add styrene-butadiene rubber and 2,2-dibenzamidodiphenyl disulfide into an open mill, set the roller temperature to 70°C, roll and grind for 15 minutes, then place for 24 hours to obtain styrene-butadiene rubber internal compound for use; Step 3: Add styrene-butadiene rubber internal mixer, benzoyl peroxide, and the flame retardant and heat-resistant agent obtained in Example 3 into an internal mixer, set the temperature of the internal mixer to 150° C., mix for 12 minutes, add silicone rubber, stearic acid, N330 carbon black, and zinc oxide into the internal mixer, thin it and make triangle packages 6 times, finally add sulfur, accelerator CZ, and accelerator DM into the internal mixer, thin it and make triangle packages 6 times to obtain a mixed rubber, cool the mixed rubber and place it for 24 hours, then calender to obtain a raw rubber sheet; Step 4: vulcanize the raw rubber sheet to obtain the sole material and the upper material, bond and sew the base cloth to the upper material, bond, sew and cut the base cloth to the sole material to obtain a high temperature resistant flame retardant protective shoe.

[0025] Comparative Example 1 In this comparative example, the raw materials used in Example 6, "the flame retardant and heat-resistant agent and initiator benzoyl peroxide obtained in Example 3" are removed, and the other raw materials and preparation steps remain unchanged.

[0026] Comparative Example 2 This comparative example is commercially available high temperature resistant protective shoes.

[0027] Experimental Example 2 The high temperature resistant flame retardant protective shoes in Examples 4-6 and Comparative Example 1 and the commercially available high temperature resistant protective shoes in Comparative Example 2 were respectively subjected to heat resistance test and flame retardant performance test, and the test results are shown in Table 1; Heat resistance test: Put each component of protective shoes into an oven at 300℃ and 400℃ respectively for 30 minutes, then take them out and cool them down to test whether the soles of each component of protective shoes will soften, melt or crack; Flame retardant performance test: pour 1000℃ quartz sand on the surface of each component protective shoe, leave it for 3 minutes, and then observe the burning condition of the base material of each component protective shoe.

[0028] Table 1

[0029] It can be seen from Table 1 that the high temperature resistant flame retardant protective shoes of the present invention in Examples 4-6 can generally withstand high temperatures above 400°C, which is much better than commercially available high temperature resistant protective shoes, and will not burn after contacting high temperature objects, and has good safety performance.

[0030] The above is a detailed introduction to a kind of high temperature resistant flame retardant protective shoes and a preparation method thereof provided by the present invention. The principle and implementation method of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method of the present invention and its core idea, including the best mode, and also enables any technician in the field to practice the present invention, including the manufacture and use of any device or system, and the implementation of any combination method. It should be pointed out that for ordinary technicians in this technical field, the present invention can also be improved and modified without departing from the principle of the present invention. In particular, as long as there is no structural conflict, the various features in the embodiments disclosed in the present invention can be used in combination with each other in any way. The fact that these combinations are not exhaustively described in this specification is only for the purpose of omitting space and saving resources. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A high temperature resistant flame retardant protective shoe, characterized in that: The invention comprises the following raw materials in parts by weight: 100 parts of styrene-butadiene rubber, 15-25 parts of silicone rubber, 2-3 parts of stearic acid, 20-30 parts of carbon black, 3.6-4.8 parts of zinc oxide, 1.6-2.4 parts of sulfur, 0.5-1.5 parts of peptizer, 1.2-1.5 parts of accelerator CZ, 0.4-0.6 parts of accelerator DM, 0.1-0.3 parts of initiator, and 6-8 parts of flame retardant and heat resistant agent; Wherein, the flame retardant and heat resistant agent is prepared by the following steps: Step 1, 1-(3,5-dimethylphenyl)-1H-pyrrole-2,5-dione, N-bromosuccinimide and chloroform are mixed in a container, stirred evenly, the system temperature is raised to 40-50° C., benzoyl peroxide is added to the container, and the reaction is continued at 40-50° C. for 3-4 hours to obtain intermediate 1; Step 2, trimethyl phosphite, aniline, potassium carbonate and dichloromethane are mixed in a container, stirred evenly, iodine is added to the container, and reacted at room temperature for 30 minutes to obtain intermediate 2; Step 3: Mix the intermediate 1, the intermediate 2, sodium hydroxide and ethanol in a container, stir evenly, and react at a temperature of 70-75° C. for 24 hours to obtain the flame retardant and heat resistant agent.

2. The high temperature resistant and flame retardant protective shoe according to claim 1, characterized in that: The amount ratio of 1-(3,5-dimethylphenyl)-1H-pyrrole-2,5-dione, N-bromosuccinimide, chloroform and benzoyl peroxide used in step 1 is 10 mmol: 20 mmol: 20-30 mL: 0.2-0.4 g.

3. The high temperature resistant and flame retardant protective shoe according to claim 1, characterized in that: The amount ratio of trimethyl phosphite, aniline, potassium carbonate, dichloromethane and iodine used in step 2 is 16-20mmol:20mmol:20mmol:40-50mL:20mmol.

4. The high temperature resistant and flame retardant protective shoe according to claim 1, characterized in that: The usage ratio of intermediate 1, intermediate 2, sodium hydroxide and ethanol used in step 3 is 5-6 mmol: 10 mmol: 0.5-0.6 g: 30-40 mL.

5. A method for preparing a high temperature resistant flame retardant protective shoe according to any one of claims 1 to 4, characterized in that: The following steps are involved: The first step is to weigh the raw materials by mass: 100 parts of styrene-butadiene rubber, 15-25 parts of silicone rubber, 2-3 parts of stearic acid, 20-30 parts of carbon black, 3.6-4.8 parts of zinc oxide, 1.6-2.4 parts of sulfur, 0.5-1.5 parts of peptizer, 1.2-1.5 parts of accelerator CZ, 0.4-0.6 parts of accelerator DM, 0.1-0.3 parts of initiator, and 6-8 parts of flame retardant and heat resistant agent; Step 2: Add styrene-butadiene rubber and peptizer into the open mill, and place the mixture for 24 hours after the roll milling to obtain styrene-butadiene rubber internal mixing rubber for use; The third step is to add styrene-butadiene rubber internal mixer, initiator, flame retardant and heat resistant agent into the internal mixer for mixing, then add silicone rubber, stearic acid, carbon black and zinc oxide into the internal mixer, thinly pass and make triangle packages 4-6 times, finally add sulfur, accelerator CZ and accelerator DM into the internal mixer, thinly pass and make triangle packages 4-6 times to obtain the mixed rubber, cool the mixed rubber and place it for 24 hours before calendering to obtain the raw rubber sheet; Step 4: vulcanize the raw rubber sheet to obtain the sole material and the upper material, bond and sew the base cloth to the upper material, bond, sew and cut the base cloth to the sole material to obtain a high temperature resistant flame retardant protective shoe.

6. The method for preparing high temperature resistant flame retardant protective shoes according to claim 5, characterized in that: The peptizer is 2,2-dibenzamidodiphenyl disulfide.

7. The method for preparing high temperature resistant flame retardant protective shoes according to claim 5, characterized in that: The initiator is benzoyl peroxide.

8. The method for preparing high temperature resistant flame retardant protective shoes according to claim 5, characterized in that: The model of the carbon black is N330.

9. The method for preparing high temperature resistant flame retardant protective shoes according to claim 5, characterized in that: In the second step, the roll temperature of the mixing mill is set to 50-70°C and the mixing time is 10-15 minutes.

10. The method for preparing high temperature resistant flame retardant protective shoes according to claim 5, characterized in that: In the third step, the temperature of the internal mixer is set to 130-150°C, and the mixing time is 8-12 minutes.

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