Steel structure fireproof material and preparation method thereof

Abstract

The invention relates to a steel structure fireproof material and a preparation method thereof, and belongs to the technical field of steel structure fireproof materials. The modified fireproof material is prepared from the following raw materials by weight: 25 to 40 mL of modified perchloro-ethylene resin, 10 to 25 g of calcium silicate, 15 to 30 mL of polyaluminosiloxane, 9 to 20 g of glass fiber, 16 to 32 g of melamine phosphate, 15 to 25 g of aluminum hydroxide, 6 to 11 g of expandable graphite, 10 to 20 g of perlite and 16 to 35 g of talcum powder. The prepared modified fireproof material effectively improves the toxicity brought by the material during combustion, also improves the mechanical properties, has high toughness, tensile strength and impact strength, also improves the thermal deformation temperature, blocks heat transfer, and has stronger durability. The modified fireproof material realizes technical innovation, advances from single protection to high performance and multiple functions, and pays more attention to environmental protection, durability and heat insulation of the material.

Description

Technical Field

[0001] The present invention belongs to the technical field of steel structure fireproof materials, and in particular relates to a steel structure fireproof material and a preparation method thereof. Background Art

[0002] Steel structures are primarily constructed of steel, using sections (such as beams and columns) and steel plates as a combination of structural components. Due to their high strength, lightweight construction, and efficient construction, steel structures have become a core form of modern architecture. However, they are susceptible to deformation or localized damage. At 300°C, steel's strength drops to 50% of its normal temperature, and at 500°C, it completely loses its load-bearing capacity. Its fire resistance limit is only 10-20 minutes, leading to collapse.

[0003] Fire-retardant coatings are widely used in steel structures. Existing fireproof panels, fireproof doors, fireproof glass, and fireproof coatings are typically coated or added with flame-retardant or flame-retardant materials to reduce fire load and spread. However, existing fireproof materials suffer from issues such as low fire resistance temperatures and limits, heavy materials, generation of harmful gases when exposed to fire, and poor corrosion resistance. Therefore, the development of high-performance fireproof materials has become an inevitable trend in the field of materials science. Summary of the Invention

[0004] The purpose of the present invention is to provide a steel structure fireproof material and a preparation method thereof, which can be used to solve the problems of fireproof materials such as low fire resistance temperature and limit, generation of harmful gases when exposed to fire, or easy deformation when exposed to heat.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A method for preparing a steel structure fireproof material comprises the following steps:

[0007] S1. Dissolve perchlorethylene resin in ethylene glycol solvent, raise the temperature to dissolve, then add silane coupling agent, catalyst and epoxy acrylate in sequence to react, cool to 80°C after the reaction, add water to dilute and adjust the pH value, remove water and triethylamine by vacuum distillation, and continue the reaction for 30 minutes to obtain a mixture of epoxy acrylate grafted perchlorethylene resin;

[0008] S2, adding a mixture of diethyl maleate, p-toluenesulfonic acid, a silane coupling agent and epoxy acrylate grafted perchloroethylene resin to toluene in sequence for reaction, and then adding a curing agent to obtain a modified perchloroethylene resin;

[0009] S3. Weigh modified perchlorethylene resin, calcium silicate, polyaluminosiloxane, glass fiber and melamine phosphate, mix them evenly, and add them to a twin-screw extruder. Add ground aluminum hydroxide, expandable graphite, talc and perlite to the side feed port of the extruder, melt, extrude, dry and pelletize them to obtain a fireproof material.

[0010] Furthermore, the silane coupling agent is γ-aminopropyltriethoxysilane, and the catalyst is N,N-dimethylbenzylamine.

[0011] Furthermore, the usage ratio of epoxy acrylate, silane coupling agent, diethyl maleate, catalyst, perchlorethylene resin, p-toluenesulfonic acid, ethylene glycol, curing agent, toluene and water is 15-35 mL: 10-25 mL: 23-40 mL: 3-5 g: 20-60 mL: 5-15 g: 200-600 mL: 6-13 g: 50-100 mL: 80-160 mL.

[0012] Furthermore, the usage ratio of the modified perchlorethylene resin, calcium silicate, polyaluminosiloxane, glass fiber, melamine phosphate, aluminum hydroxide, expandable graphite, perlite and talc is 25-40 mL: 10-25 g: 15-30 mL: 9-20 g: 16-32 g: 15-25 g: 6-11 g: 10-20 g: 16-35 g.

[0013] Furthermore, the reaction conditions in step S1 are: reaction temperature 100° C., reaction time 6 hours.

[0014] Furthermore, in step S1, the rotation speed of the reaction device is 1100-1300 r / min.

[0015] Furthermore, in step S2, the reaction conditions are: temperature 70° C., reaction time 10 h.

[0016] Furthermore, the curing agent is diaminodiphenyl sulfone.

[0017] Furthermore, the temperatures of the zones of the twin-screw extruder are 180° C., 220° C., 260° C., and 190° C. from the front to the back.

[0018] A steel structure fireproof material comprising the following raw materials in weight ratio:

[0019] The usage ratio of modified perchlorethylene resin, calcium silicate, polyaluminosiloxane, glass fiber, melamine phosphate, aluminum hydroxide, expandable graphite, perlite and talc is 25-40mL: 10-25g: 15-30mL: 9-20g: 16-32g: 15-25g: 6-11g: 10-20g: 16-35g.

[0020] Beneficial effects of the present invention:

[0021] (1) In the fire-retardant coating for steel structures of the present invention, the perchloroethylene resin releases flame-retardant gas when burning. The material itself is not easy to burn, but toxic hydrogen chloride gas is released during the combustion process, which is very harmful to the human body. Therefore, the perchloroethylene resin is modified to inhibit the release of its toxic gas, thereby effectively improving the toxicity brought by the material itself during combustion.

[0022] (2) The present invention grafts epoxy acrylate onto perchloroethylene resin through free radical polymerization to form an interpenetrating network structure, which can significantly improve mechanical properties, have high toughness, tensile strength and impact strength, enhance mechanical strength, and at the same time increase heat deformation temperature.

[0023] (3) The present invention grafts diethyl maleate onto polyvinyl chloride resin. The chemical bonds formed after grafting can enhance the interfacial bonding force between different components in the blending system. At the same time, the introduced carboxylate groups can significantly increase the polarity of the material, thereby improving the compatibility with non-polar polymers and polar polymers, effectively blocking heat transfer, and having the advantages of strong fire resistance, thereby increasing the fire resistance temperature and fire resistance limit time.

[0024] (4) Synergistic effect of the double grafting of the present invention: the carboxylate group of diethyl maleate can enhance the polarity of the perchloroethylene resin and improve its interfacial bonding strength with non-polar materials. At the same time, the epoxy group of epoxy acrylate can form a chemical bond with the perchloroethylene resin, further strengthening the compatibility of the resin with the polar polymer. The double grafting system can significantly enhance the tensile strength of the blend. During the curing process, the epoxy group of epoxy acrylate undergoes a ring-opening reaction with the ester group of diethyl maleate to form an interpenetrating network structure, thereby increasing the heat deformation temperature of the perchloroethylene resin and inhibiting the thermal decomposition tendency of the perchloroethylene resin, thereby reducing the release of hydrogen chloride. 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 embodiments described 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 making any creative efforts shall fall within the scope of protection of the present invention.

[0026] Example 1

[0027] The steel structure fireproofing material of this embodiment includes the following raw materials in the following weight proportions:

[0028] The usage ratio of epoxy acrylate, silane coupling agent, diethyl maleate, catalyst, perchlorethylene resin, p-toluenesulfonic acid, ethylene glycol, curing agent, toluene and water is 15mL:10mL:23mL:3g:20mL:5g:200mL:6g:50mL:80mL;

[0029] The usage ratio of modified perchlorethylene resin, calcium silicate, polyaluminosiloxane, glass fiber, melamine phosphate, aluminum hydroxide, expandable graphite, perlite and talc is 25mL:10g:15mL:9g:16g:15g:6g:10g:16g.

[0030] This embodiment is based on a method for preparing a fireproof material for steel structures, which uses chemical copolymerization technology to form a grafted synergistic flame-retardant fireproof material;

[0031] The preparation method of the modified perchlorethylene resin comprises the following specific steps:

[0032] Step 1: Add 200 mL of ethylene glycol solvent to a reaction vessel, dissolve the perchlorethylene resin in the solvent, heat to 100°C to dissolve it in the solvent, then add a silane coupling agent, a catalyst, and epoxy acrylate in sequence, heat to 100°C to react for 6 hours, and then remove the solvent by distillation under reduced pressure;

[0033] In step 1, the silane coupling agent is γ-aminopropyltriethoxysilane and the catalyst is N,N-dimethylbenzylamine;

[0034] Step 2: After the reaction is completed, the temperature is lowered to 80° C., a small amount of water is added for dilution, the pH value of the reaction is adjusted to neutral with triethylamine, the water and triethylamine are removed by reduced pressure distillation, and then the reaction is continued at 80° C. for 30 minutes at a rotation speed of 1100 r / min in the reaction apparatus to obtain a mixture of epoxy acrylate grafted perchlorethylene resin;

[0035] Step 3: Add a mixture of diethyl maleate, p-toluenesulfonic acid, a silane coupling agent, and epoxy acrylate grafted perchloroethylene resin to 50 mL of toluene in sequence, mix well, react at 70° C. for 10 hours, remove toluene under reduced pressure, add a curing agent, and use a curing process to obtain a stable final product of a polymer of epoxy acrylate grafted perchloroethylene resin grafted with diethyl maleate, i.e., a modified perchloroethylene resin;

[0036] In step 3, the curing agent is diaminodiphenyl sulfone;

[0037] Step 4: Weigh the modified perchlorethylene resin, calcium silicate, polyaluminosiloxane, glass fiber and melamine phosphate, mix them evenly, add them to a twin-screw extruder, add ground aluminum hydroxide, expandable graphite, talc and perlite to the side feed port, melt, extrude, dry and pelletize them to obtain a fireproof material.

[0038] In step 4, the temperatures of the zones of the twin-screw extruder are 180° C., 220° C., 260° C., and 190° C. from front to back.

[0039] Example 2

[0040] The steel structure fireproofing material of this embodiment includes the following raw materials in the following weight proportions:

[0041] The usage ratio of epoxy acrylate, silane coupling agent, diethyl maleate, catalyst, perchlorethylene resin, p-toluenesulfonic acid, ethylene glycol, curing agent, toluene and water is 25mL:27mL:32mL:4g:40mL:10g:400mL:9g:75mL:120mL;

[0042] The usage ratio of modified perchlorethylene resin, calcium silicate, polyaluminosiloxane, glass fiber, melamine phosphate, aluminum hydroxide, expandable graphite, perlite and talc is 32mL:17g:23mL:15g:24g:20g:9g:15g:25g.

[0043] This embodiment is based on a method for preparing a fireproof material for steel structures, which uses chemical copolymerization technology to form a grafted synergistic flame-retardant fireproof material;

[0044] The preparation method of the modified perchlorethylene resin comprises the following specific steps:

[0045] Step 1: Add 400 mL of ethylene glycol solvent to a reaction vessel, dissolve the perchlorethylene resin in the solvent, heat to 100°C to dissolve it in the solvent, then add a silane coupling agent, a catalyst, and epoxy acrylate in sequence, heat to 100°C to react for 6 hours, and then remove the solvent by distillation under reduced pressure;

[0046] In step 1, the silane coupling agent is γ-aminopropyltriethoxysilane and the catalyst is N,N-dimethylbenzylamine;

[0047] Step 2: After the reaction is completed, the temperature is lowered to 80° C., a small amount of water is added for dilution, the pH value of the reaction is adjusted to neutral with triethylamine, the water and triethylamine are removed by reduced pressure distillation, and then the reaction is continued at 80° C. for 30 minutes at a rotation speed of 1100 r / min in the reaction apparatus to obtain a mixture of epoxy acrylate grafted perchlorethylene resin;

[0048] Step 3: Add a mixture of diethyl maleate, p-toluenesulfonic acid, a silane coupling agent, and epoxy acrylate grafted perchloroethylene resin to 75 mL of toluene in sequence, mix well, react at 70° C. for 10 hours, remove toluene under reduced pressure, add a curing agent, and use a curing process to obtain a stable final product, which is a polymer of epoxy acrylate grafted perchloroethylene resin grafted with diethyl maleate, i.e., a modified perchloroethylene resin;

[0049] In step 3, the curing agent is diaminodiphenyl sulfone;

[0050] Step 4: Weigh the modified perchlorethylene resin, calcium silicate, polyaluminosiloxane, glass fiber and melamine phosphate, mix them evenly, add them to a twin-screw extruder, add ground aluminum hydroxide, expandable graphite, talc and perlite to the side feed port, melt, extrude, dry and pelletize them to obtain a fireproof material.

[0051] In step 4, the temperatures of the zones of the twin-screw extruder are 180° C., 220° C., 260° C., and 190° C. from front to back.

[0052] Example 3

[0053] The steel structure fireproofing material of this embodiment includes the following raw materials in the following weight proportions:

[0054] The usage ratio of epoxy acrylate, silane coupling agent, diethyl maleate, catalyst, perchlorethylene resin, p-toluenesulfonic acid, ethylene glycol, curing agent, toluene and water is 35mL:25mL:40mL:5g:60mL:15g:600mL:13g:100mL:160mL;

[0055] The usage ratio of modified perchlorethylene resin, calcium silicate, polyaluminosiloxane, glass fiber, melamine phosphate, aluminum hydroxide, expandable graphite, perlite and talc is 40mL:25g:30mL:20g:32g:25g:11g:20g:35g.

[0056] This embodiment is based on a method for preparing a fireproof material for steel structures, which uses chemical copolymerization technology to form a grafted synergistic flame-retardant fireproof material;

[0057] The preparation method of the modified perchlorethylene resin comprises the following specific steps:

[0058] Step 1: Add 600 mL of ethylene glycol solvent to a reaction vessel, dissolve the perchlorethylene resin in the solvent, heat to 100°C to dissolve it in the solvent, then add a silane coupling agent, a catalyst, and epoxy acrylate in sequence, heat to 100°C to react for 6 hours, and then remove the solvent by distillation under reduced pressure;

[0059] In step 1, the silane coupling agent is γ-aminopropyltriethoxysilane and the catalyst is N,N-dimethylbenzylamine;

[0060] Step 2: After the reaction is completed, the temperature is lowered to 80° C., a small amount of water is added for dilution, the pH value of the reaction is adjusted to neutral with triethylamine, the water and triethylamine are removed by reduced pressure distillation, and then the reaction is continued at 80° C. for 30 minutes at a rotation speed of 1100 r / min in the reaction apparatus to obtain a mixture of epoxy acrylate grafted perchlorethylene resin;

[0061] Step 3: Add a mixture of diethyl maleate, p-toluenesulfonic acid, a silane coupling agent, and epoxy acrylate grafted perchloroethylene resin to 100 mL of toluene in sequence, mix well, react at 70° C. for 10 hours, remove toluene under reduced pressure, add a curing agent, and use a curing process to obtain a stable final product of a polymer of epoxy acrylate grafted perchloroethylene resin grafted with diethyl maleate, i.e., a modified perchloroethylene resin;

[0062] In step 3, the curing agent is diaminodiphenyl sulfone;

[0063] Step 4: Weigh the modified perchlorethylene resin, calcium silicate, polyaluminosiloxane, glass fiber and melamine phosphate, mix them evenly, add them to a twin-screw extruder, add ground aluminum hydroxide, expandable graphite, talc and perlite to the side feed port, melt, extrude, dry and pelletize them to obtain a fireproof material.

[0064] In step 4, the temperatures of the zones of the twin-screw extruder are 180° C., 220° C., 260° C., and 190° C. from front to back.

[0065] Comparative Example 1

[0066] Comparative Example 1 uses unmodified fireproof material and prepares a steel structure fireproof material by referring to the preparation method of Example 1. The specific steps are as follows:

[0067] The steel structure fireproofing material of this embodiment includes the following raw materials in the following weight proportions:

[0068] The usage ratio of unmodified perchlorethylene resin, calcium silicate, polyaluminosiloxane, glass fiber, melamine phosphate, aluminum hydroxide, expandable graphite, perlite and talc is 25mL:10g:15mL:9g:16g:15g:6g:10g:16g.

[0069] Step 1: Weigh unmodified perchlorethylene resin, calcium silicate, polyaluminosiloxane, glass fiber and melamine phosphate, mix them evenly, add them to a twin-screw extruder, add ground aluminum hydroxide, expandable graphite, talc powder and perlite to the side feed port, melt, extrude, dry and pelletize them to obtain a fireproof material.

[0070] In step 1, the temperatures of the zones of the twin-screw extruder are 180° C., 220° C., 260° C., and 190° C. from the front to the back.

[0071] Comparative Example 2

[0072] Comparative Example 2 uses grafted epoxy acrylate and the preparation method of Reference Example 1 to prepare a steel structure fireproof material. The specific steps are as follows:

[0073] The steel structure fireproofing material of this embodiment includes the following raw materials in the following weight proportions:

[0074] The usage ratio of epoxy acrylate, silane coupling agent, catalyst, perchlorethylene resin, p-toluenesulfonic acid, ethylene glycol, curing agent, toluene and water is 25mL:27mL:4g:40mL:10g:400mL:9g:75mL:120mL;

[0075] The usage ratio of modified perchlorethylene resin, calcium silicate, polyaluminosiloxane, glass fiber, melamine phosphate, aluminum hydroxide, expandable graphite, perlite and talc is 25mL:10g:15mL:9g:16g:15g:6g:10g:16g.

[0076] The preparation method of the modified perchlorethylene resin comprises the following specific steps:

[0077] Step 1: Add 200 mL of ethylene glycol solvent to a reaction vessel, dissolve the perchlorethylene resin in the solvent, heat to 100°C to dissolve it in the solvent, then add a silane coupling agent, a catalyst, and epoxy acrylate in sequence, heat to 100°C to react for 6 hours, and then remove the solvent by distillation under reduced pressure;

[0078] In step 1, the silane coupling agent is γ-aminopropyltriethoxysilane and the catalyst is N,N-dimethylbenzylamine;

[0079] Step 2: After the reaction is completed, the temperature is lowered to 80° C., a small amount of water is added for dilution, the pH value of the reaction is adjusted to neutral with triethylamine, the water and triethylamine are removed by reduced pressure distillation, and then the reaction is continued at 80° C. for 30 minutes at a rotation speed of 1100 r / min in the reaction apparatus to obtain a mixture of epoxy acrylate grafted perchlorethylene resin;

[0080] Step 3: adding a curing agent to the mixture of step 2 and using a curing process to obtain a stable final product which is epoxy acrylate grafted perchlorethylene resin;

[0081] In step 3, the curing agent is diaminodiphenyl sulfone;

[0082] Step 4: Weigh the modified perchlorethylene resin, calcium silicate, polyaluminosiloxane, glass fiber and melamine phosphate, mix them evenly, add them to a twin-screw extruder, add ground aluminum hydroxide, expandable graphite, talc and perlite to the side feed port, melt, extrude, dry and pelletize them to obtain a fireproof material.

[0083] In step 4, the temperatures of the zones of the twin-screw extruder are 180° C., 220° C., 260° C., and 190° C. from front to back.

[0084] Comparative Example 3

[0085] Comparative Example 3 uses grafted diethyl maleate and the preparation method of Reference Example 1 to prepare a steel structure fireproof material. The specific steps are as follows:

[0086] The steel structure fireproofing material of this embodiment includes the following raw materials in the following weight proportions:

[0087] The dosage ratio of silane coupling agent, diethyl maleate, catalyst, perchlorethylene resin, p-toluenesulfonic acid, ethylene glycol, curing agent, toluene and water is 27 mL: 32 mL: 4 g: 40 mL: 10 g: 400 mL: 9 g: 75 mL: 120 mL;

[0088] The usage ratio of modified perchlorethylene resin, calcium silicate, polyaluminosiloxane, glass fiber, melamine phosphate, aluminum hydroxide, expandable graphite, perlite and talc is 25mL:10g:15mL:9g:16g:15g:6g:10g:16g.

[0089] The preparation method of the modified perchlorethylene resin comprises the following specific steps:

[0090] Step 1: Add 200 mL of ethylene glycol solvent to a reaction vessel, dissolve the perchlorethylene resin in the solvent, heat to 100°C to dissolve it in the solvent, then add a silane coupling agent, a catalyst, and diethyl maleate in sequence, heat to 100°C to react for 6 hours, and then remove the solvent by distillation under reduced pressure;

[0091] In step 1, the silane coupling agent is γ-aminopropyltriethoxysilane and the catalyst is N,N-dimethylbenzylamine;

[0092] Step 2: After the reaction is completed, the temperature is lowered to 80° C., a small amount of water is added for dilution, the pH value of the reaction is adjusted to neutral with triethylamine, the water and triethylamine are removed by reduced pressure distillation, and then the reaction is continued at 80° C. for 30 minutes at a rotation speed of 1100 r / min in the reaction apparatus to obtain a mixture of diethyl maleate grafted with perchlorethylene resin;

[0093] Step 3: adding a curing agent to the mixture of step 2, and using a curing process to obtain a stable final product which is a polymer of perchlorethylene resin grafted with diethyl maleate;

[0094] In step 3, the curing agent is diaminodiphenyl sulfone;

[0095] Step 4: Weigh the modified perchlorethylene resin, calcium silicate, polyaluminosiloxane, glass fiber and melamine phosphate, mix them evenly, add them to a twin-screw extruder, add ground aluminum hydroxide, expandable graphite, talc and perlite to the side feed port, melt, extrude, dry and pelletize them to obtain a fireproof material.

[0096] In step 4, the temperatures of the zones of the twin-screw extruder are 180° C., 220° C., 260° C., and 190° C. from front to back.

[0097] In order to verify the performance of the steel structure fireproof material examples and comparative examples obtained in the present invention, conventional index tests were performed on them. The tensile strength was tested according to the test standard of GB / T 17657-2013, the thermal conductivity was tested according to the test standard of GB / T 10294, the flame retardancy was referenced to the national standard UL94, and the smoke emission was tested according to the test standard of GB 8624-2012. The results are shown in the table:

[0098]

[0099] It can be seen from the data in the above table that, compared with the tensile strength, the data in Examples 1-3 are all higher than the unmodified fireproof material in Comparative Example 1, indicating that the tensile strength of the modified fireproof material has been improved, among which the grafting of epoxy acrylate in Comparative Example 2 has the highest effect among the comparative examples, indicating that the grafting of epoxy acrylate helps to improve the mechanical properties and toughness; from the thermal conductivity, it can be seen that the thermal conductivity of the embodiments is lower than that of the comparative examples, indicating that the grafting of diethyl maleate onto the polyvinyl chloride resin can effectively block heat transfer and increase the fire resistance limit time; the flame retardant grade of Examples 1-3 is also higher than that of Comparative Example 1, indicating that the flame retardant effect of the modified fireproof material is better; the smoke release in Examples 1-3 is lower than that in Comparative Example 1, after being modified by the fireproof material, the release amount is lower, which achieves the purpose of suppressing the risk of combustion while reducing environmental pollution.

[0100] The above is a detailed introduction to a steel structure fireproof material and a preparation method thereof provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core ideas, including the best way, and also enables any technician in this 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 in a number of ways without departing from the principles 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 combined with each other in any way. The fact that these combinations are not exhaustively described in this specification is simply for the sake of omitting space and saving resources. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A method for preparing a fireproof material for a steel structure, characterized in that: The following steps are involved: S1. Dissolve perchlorethylene resin in ethylene glycol solvent, raise the temperature to dissolve, then add silane coupling agent, catalyst and epoxy acrylate in sequence to react, cool to 80°C after the reaction, add water to dilute and adjust the pH value, remove water and triethylamine by vacuum distillation, and continue the reaction for 30 minutes to obtain a mixture of epoxy acrylate grafted perchlorethylene resin; S2, adding a mixture of diethyl maleate, p-toluenesulfonic acid, a silane coupling agent and epoxy acrylate grafted perchloroethylene resin to toluene in sequence for reaction, and then adding a curing agent to obtain a modified perchloroethylene resin; S3. Weigh modified perchlorethylene resin, calcium silicate, polyaluminosiloxane, glass fiber and melamine phosphate, mix them evenly, and add them to a twin-screw extruder. Add ground aluminum hydroxide, expandable graphite, talc and perlite to the side feed port of the extruder, melt, extrude, dry and pelletize them to obtain a fireproof material.

2. The method for preparing a fireproof material for steel structure according to claim 1, characterized in that: The silane coupling agent is γ-aminopropyltriethoxysilane, and the catalyst is N,N-dimethylbenzylamine.

3. The method for preparing a fireproof material for steel structure according to claim 1, characterized in that: The usage ratio of epoxy acrylate, silane coupling agent, diethyl maleate, catalyst, perchlorethylene resin, p-toluenesulfonic acid, ethylene glycol, curing agent, toluene and water is 15-35mL: 10-25mL: 23-40mL: 3-5g: 20-60mL: 5-15g: 200-600mL: 6-13g: 50-100mL: 80-160mL.

4. The method for preparing a fireproof material for steel structure according to claim 1, characterized in that: The usage ratio of modified perchlorethylene resin, calcium silicate, polyaluminosiloxane, glass fiber, melamine phosphate, aluminum hydroxide, expandable graphite, perlite and talc is 25-40mL: 10-25g: 15-30mL: 9-20g: 16-32g: 15-25g: 6-11g: 10-20g: 16-35g.

5. The method for preparing a fireproof material for steel structure according to claim 1, characterized in that: The reaction conditions in step S1 are: reaction temperature 100° C., reaction time 6 hours.

6. The method for preparing a fireproof material for steel structure according to claim 1, characterized in that: In step S1, the rotation speed of the reaction device is 1100-1300 r / min.

7. The method for preparing a fireproof material for steel structure according to claim 1, characterized in that: In step S2, the reaction conditions are: temperature 70° C., reaction time 10 h.

8. The method for preparing a fireproof material for steel structure according to claim 1, characterized in that: The curing agent is diaminodiphenyl sulfone.

9. The method for preparing a fireproof material for steel structure according to claim 1, characterized in that: The temperatures of the twin-screw extruder sections were 180°C, 220°C, 260°C, and 190°C from front to back.

10. A fireproof material for steel structure, characterized in that: Prepared by the method according to any one of claims 1 to 9, the steel structure fireproof material comprises the following weight ratios: The usage ratio of modified perchlorethylene resin, calcium silicate, polyaluminosiloxane, glass fiber, melamine phosphate, aluminum hydroxide, expandable graphite, perlite and talc is 25-40mL: 10-25g: 15-30mL: 9-20g: 16-32g: 15-25g: 6-11g: 10-20g: 16-35g.

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