Building fire-fighting coating fireproof material

Abstract

Belonging to the technical field of fireproof coatings, the invention relates to a building fire protection coating fireproof material, which is prepared from the following raw materials: 45-55 parts of acrylic emulsion, 20-25 parts of modified intumescent flame retardant, 5-8 parts of pigment filler, 3-5 parts of dispersant, 1-3 parts of defoaming agent and 20-30 parts of deionized water. According to the technical scheme, the flame-retardant material is obtained by combining the flame-retardant compound with the amino silane; the fireproof filler is coated with layered double hydroxides, so that a reinforcing material is obtained; a flame-retardant material is combined with a reinforcing material to obtain a modified intumescent flame retardant; and uniformly mixing the acrylic emulsion, the modified intumescent flame retardant, the pigment filler, the dispersing agent, the defoaming agent and the deionized water to finally obtain the building fire-fighting coating fireproof material. The modified intumescent flame retardant well improves the fireproof performance, the flame retardant performance and the impact resistance of the fireproof coating material, the environment-friendly performance is good, and the comprehensive performance of the building fire-fighting coating fireproof material is integrally improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of fire retardant coatings, and in particular relates to a fire retardant material for building fire protection coatings. Background Art

[0002] With the rapid development of high-rise buildings, large commercial complexes, and underground spaces due to accelerated urbanization, fire risks have become a significant threat to public safety and property. Traditional building materials (such as steel and concrete) are susceptible to softening and cracking at high temperatures, leading to structural collapse and further exacerbating the spread of fire. The widespread use of steel structures, in particular, highlights the importance of strengthening fire protection. Application of fire-retardant coatings to steel structures has proven to be one of the most ideal and practical fire protection methods. Fire-retardant coatings are primarily classified into intumescent and non-intumescent types. Intumescent fire-retardant coatings are more widely used due to their thin coating, ease of application, and excellent adhesion. When heated, these coatings expand to form a honeycomb-like carbonized layer, which acts as a heat and oxygen barrier. They also decompose non-combustible gases, isolate and dilute the air, and absorb heat through a series of physical and chemical reactions, effectively slowing the spread of fire and buying valuable time for firefighting and evacuation. Fire-retardant coatings for buildings are not only suitable for steel structures but also widely used in aviation, transportation, military, and shipbuilding, significantly reducing fire risks and minimizing losses. Therefore, while continuously improving fire protection and disaster reduction technologies, strengthening the research on fire-retardant coating materials has become an important development direction in the engineering field.

[0003] In the existing technology, fire-proof coating materials for buildings usually use acrylic emulsion as the base resin, and improve the fire resistance of the material by adding halogen flame retardants. However, halogen flame retardants will release a large amount of hydrogen halide gas and other harmful gases during the combustion process, which will cause serious harm to human health and the environment; and traditional fire-proof coating materials are affected by complex environments, such as ultraviolet rays, humidity changes, etc., and are prone to aging and falling off, which not only shortens the service life of the material, but also affects its long-term fire resistance and mechanical properties. Therefore, it is necessary to further improve the fire resistance and mechanical properties of fire-proof coating materials for buildings. Summary of the Invention

[0004] The object of the present invention is to provide a fireproofing material for building fire protection coating, which comprises combining a flame retardant compound with aminosilane to obtain a flame retardant material; coating a refractory filler with layered double hydroxide to obtain a reinforcing material; combining the flame retardant material in step S1 with the reinforcing material in step S2 to obtain a modified intumescent flame retardant; uniformly mixing an acrylic emulsion, a modified intumescent flame retardant, a pigment, a dispersant, a defoaming agent and deionized water to finally obtain a fireproofing material for building fire protection coating; the modified intumescent flame retardant plays a good protective role, can effectively improve the fireproofing performance, flame retardant performance and mechanical properties of the fireproofing coating material, and has good environmental performance, can also enhance the adhesion between the fireproofing coating material and the substrate, extend the service life of the fireproofing coating material, and generally improve the comprehensive performance of the fireproofing material for building fire protection coating.

[0005] The technical problem to be solved by the present invention is as follows: In the existing technology, building fire-proof coating fire-proof materials usually use acrylic emulsion as the base resin, and improve the fire resistance of the material by adding halogen flame retardants. However, halogen flame retardants will release a large amount of hydrogen halide gas and other harmful gases during the combustion process, which will cause serious harm to human health and the environment; and traditional fire-proof coating materials are affected by complex environments, such as ultraviolet rays, humidity changes, etc., and are prone to aging and falling off, which not only shortens the service life of the material, but also affects its long-term fire resistance and mechanical properties. Therefore, it is necessary to further improve the fire resistance and mechanical properties of building fire-proof coating fire-proof materials.

[0006] The purpose of the present invention can be achieved through the following technical solutions: A fireproofing material for building fire protection coating, comprising the following raw materials in parts by weight: 45-55 parts of acrylic emulsion, 20-25 parts of modified intumescent flame retardant, 5-8 parts of pigment and filler, 3-5 parts of dispersant, 1-3 parts of defoaming agent and 20-30 parts of deionized water; The preparation method of the modified intumescent flame retardant comprises the following steps: S1: flame retardant material is obtained by combining flame retardant compound with aminosilane; S2: Reinforced material is obtained by coating refractory filler with layered double hydroxide; S3: combining the flame retardant material in step S1 with the reinforcing material in step S2 to obtain a modified intumescent flame retardant.

[0007] Furthermore, step S1 is specifically as follows: The flame retardant compound is added to acetonitrile and mixed evenly to obtain component A. Aminosilane is added to acetonitrile and mixed evenly to obtain component B. Component B is added to component A, and then stirred and reacted at 70-80° C. for 9-11 hours. After the reaction is completed, it is cooled to room temperature, filtered, centrifuged for 5-10 minutes, washed with acetonitrile, and finally vacuum dried at 60-70° C. to obtain a flame retardant material.

[0008] During the above reaction process, the flame retardant compound has a phosphate group and the aminosilane has an amino group. The phosphate group in the flame retardant compound can react and combine with the amino group in the aminosilane, combining the flame retardant compound and the aminosilane to finally obtain a flame retardant material.

[0009] Furthermore, the mass ratio of the flame retardant compound to acetonitrile is 4.5-5:50-60.

[0010] Furthermore, the flame retardant compound is composed of a mixture of pentaerythritol diphosphate and phytic acid in a mass ratio of 0.8-0.9:0.6-0.7.

[0011] Furthermore, the mass ratio of the aminosilane to acetonitrile is 11.5-12:30-40.

[0012] Furthermore, the aminosilane is composed of 3-aminopropyltriethoxysilane and p-aminophenyltriethoxysilane mixed in a mass ratio of 1-1.2:0.7-0.9.

[0013] Furthermore, the mass ratio of component B to component A is 2:1.

[0014] Furthermore, the preparation method of pentaerythritol diphosphate comprises the following steps: A1: Pentaerythritol, phosphorus trichloride, and acetonitrile are uniformly mixed and stirred at 65-75°C under a nitrogen atmosphere for 1.5-2.5 hours. The temperature is then raised to 80-90°C and the stirring reaction is continued for 9.5-10.5 hours. After the reaction is completed, the mixture is cooled to room temperature, filtered, washed with anhydrous ethanol and dichloromethane, and finally dried in vacuo at 50-60°C to obtain spiropentaerythritol diphosphate chloride. A2: Add the spirocyclic pentaerythritol diphosphate chloride prepared in step A1 to acetonitrile, and heat to 75-85°C under a nitrogen atmosphere. Then add deionized water and stir to react for 1-2 hours. After the reaction is completed, cool to room temperature, filter, wash with acetone and acetonitrile, and finally dry in vacuo at 50-60°C to obtain pentaerythritol diphosphate.

[0015] Furthermore, in step A1, the mass ratio of pentaerythritol, phosphorus trichloride, and acetonitrile is 13.5-14:25-30:95-105.

[0016] Furthermore, in step A2, the mass ratio of the spiropentaerythritol diphosphate chloride, acetonitrile, and deionized water is 7.5-8.5:50-60:5-7.

[0017] Furthermore, step S2 is specifically as follows: Add refractory filler, Ca(NO3)2·4H2O, and Al(NO3)3·9H2O to deionized water and stir at room temperature for 10-15 minutes. Then adjust the pH value of the system to 9.5-10.5 with sodium hydroxide solution, and then carry out hydrothermal reaction at 145-155°C for 17-19 hours. After the reaction is completed, cool to room temperature, filter, wash with deionized water, and finally vacuum dry at 55-65°C to obtain a reinforced material.

[0018] During the above reaction process, Ca(NO3)2·4H2O and Al(NO3)3·9H2O are hydrothermally reacted under alkaline conditions to synthesize layered double hydroxides, and then the layered double hydroxides grow in situ on the surface of the refractory filler, so that the layered double hydroxides are coated on the surface of the refractory filler, thereby forming a core-shell structure, and finally obtaining a reinforced material.

[0019] Furthermore, the mass ratio of the refractory filler, Ca(NO3)2·4H2O, Al(NO3)3·9H2O, and deionized water is 4.5-5.5:5-6:11-12:280-320.

[0020] Furthermore, the refractory filler is composed of expandable graphite and halloysite nanotubes mixed in a mass ratio of 0.7-0.8:0.5-0.6.

[0021] Furthermore, the method for preparing expandable graphite comprises the following steps: The natural flake graphite, phosphoric acid and nitric acid mixed solution were mixed and stirred at 25 ° C for 5 minutes, potassium permanganate was added, and the stirring reaction was continued for 2.5 hours. After the reaction was completed, deionized water was added for dilution, vacuum filtered, and vacuum dried at 60 ° C for 12 hours to finally obtain expandable graphite.

[0022] Furthermore, the mass ratio of the natural flake graphite, the mixed solution of phosphoric acid and nitric acid, and potassium permanganate is 5:15:1.5.

[0023] Furthermore, step S3 is specifically as follows: The flame retardant material in step S1 is added to a mixed solution of ethanol and deionized water and ultrasonically treated for 10-20 minutes. Then, the reinforcing material in step S2 is added and stirred at 75-85° C. for 6-8 hours. The mixture is filtered, washed with ethanol and deionized water, and finally vacuum dried at 55-65° C. to obtain a modified intumescent flame retardant.

[0024] During the above reaction process, the aminosilane in the flame retardant material is hydrolyzed to produce silanol groups, and the surface of the reinforcing material has hydroxyl groups. The silanol groups in the flame retardant material can combine with the hydroxyl groups in the reinforcing material, thereby grafting the flame retardant material to the surface of the reinforcing material, and finally obtaining a modified intumescent flame retardant.

[0025] Furthermore, the mass ratio of the flame retardant material, the mixed solution of ethanol and deionized water, and the reinforcing material is 0.5-0.7:90-110:1.8-2.

[0026] A method for preparing a fireproof material for a building fire-fighting coating comprises the following steps: Weigh parts by mass of raw materials, mix a modified intumescent flame retardant, pigments and fillers, a dispersant and deionized water, and stir at a speed of 1000-1500 rpm for 25-35 minutes to obtain a premix, add the premix to an acrylic emulsion, and then stir at a speed of 500-800 rpm for 10-20 minutes, then add a defoaming agent, and continue stirring at a speed of 300-500 rpm for 5-10 minutes to finally obtain a building fire coating fireproof material.

[0027] Furthermore, the pigment filler is at least one of heavy calcium carbonate, bentonite, and nano zinc oxide.

[0028] Furthermore, the dispersant is composed of sodium dodecylbenzenesulfonate and sodium hexametaphosphate mixed in a mass ratio of 0.6-0.7:0.4-0.5.

[0029] Furthermore, the defoaming agent is composed of a mixture of polydimethylsiloxane and polyoxyethylene polyoxypropylene pentaerythritol ether in a mass ratio of 2:1.

[0030] Beneficial effects of the present invention: (1) In the technical solution of the present invention, a flame retardant material is obtained by combining a flame retardant compound with aminosilane; the flame retardant compound is composed of a mixture of pentaerythritol diphosphate and phytic acid, both of which have good flame retardant properties, and the two can play a synergistic role, which can effectively improve the flame retardant and fireproof properties of the fire-retardant coating material; aminosilane is composed of a mixture of 3-aminopropyltriethoxysilane and p-aminophenyltriethoxysilane, both of which have amino groups, which can enhance the binding force between aminosilane and the flame retardant compound and provide reaction sites for subsequent reactions. In addition, aminosilane contains silicon and nitrogen elements, and the flame retardant compound contains more phosphorus elements. When aminosilane is combined with the flame retardant compound, the two also play a synergistic flame retardant role, and after combination, a flame retardant containing High-efficiency flame retardant materials of phosphorus, nitrogen and silicon can form a dense and stable expanded carbon layer on the surface of the substrate, showing excellent flame retardant effect, further improving the flame retardant properties, thermal stability and fire resistance of the fire-retardant coating material, and enhancing the interface compatibility between the flame retardant material and the acrylic emulsion; by coating the refractory filler with layered double hydroxide, a reinforced material is obtained; the refractory filler is composed of a mixture of expandable graphite and halloysite nanotubes, both of which have good flame retardant properties and play a synergistic flame retardant role, and the layered double hydroxide has good weather resistance. Coating with the layered double hydroxide can improve the dispersibility of the refractory filler, and improve its thermal stability and durability, while also synergistically playing a flame retardant and reinforcing role, further enhancing the fire resistance, flame retardant properties and mechanical properties of the fire-retardant coating material.

[0031] (2) In the technical solution of the present invention, a modified intumescent flame retardant is obtained by combining a flame retardant material with a reinforcing material; combining the flame retardant material with the reinforcing material not only improves the bonding strength between the two, but also the presence of aminosilane in the flame retardant material can further improve the dispersibility of the reinforcing material and prevent its agglomeration, and improves the interfacial compatibility between the reinforcing material and the acrylic emulsion, and increases the adhesion between the fire-retardant coating material and the substrate, thereby effectively improving the fireproofing performance, flame retardant performance and mechanical properties of the fire-retardant coating material, and improving the overall performance of the fire-retardant coating material; the acrylic emulsion, the modified intumescent flame retardant, the pigment, the dispersant, the defoaming agent and the deionized water are uniformly mixed to finally obtain a building fire-proof coating fireproof material; the modified intumescent flame retardant effectively improves the comprehensive performance of the fire-proof coating material, so that the prepared building fire-proof coating fireproof material has a better protective effect, and the raw materials used are more environmentally friendly, which can further reduce the harm caused by the building fire-proof coating fireproof material to the environment and human health.

[0032] (3) In the technical solution of the present invention, a flame retardant material is obtained by combining a flame retardant compound with aminosilane; a reinforced material is obtained by coating a refractory filler with a layered double hydroxide; the flame retardant material and the reinforced material are combined to obtain a modified intumescent flame retardant; acrylic emulsion, modified intumescent flame retardant, pigment filler, dispersant, defoaming agent and deionized water are mixed evenly to obtain a fireproofing coating material for building fire protection; the flame retardant performance, fireproofing performance and mechanical properties of the fireproofing coating material are improved as a whole, the adhesion between the fireproofing coating material and the substrate is also enhanced, the service life of the fireproofing coating material for building fire protection is extended, and the fireproofing coating material has good environmental protection and good overall comprehensive performance. DETAILED DESCRIPTION

[0033] 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.

[0034] The specific parameters of the raw materials used in the present invention are as follows: Phytic acid, CAS No. 83-86-3, Product No. P108521, provided by Shanghai Aladdin Biochemical Technology Co., Ltd.; 3-aminopropyltriethoxysilane, CAS No. 919-30-2, Product No. A800523, provided by Shanghai MacLean Biochemical Technology Co., Ltd.; p-aminophenyltriethoxysilane, CAS No. 7003-80-7, Product No. BD628378, provided by Shanghai Bid Pharmaceutical Technology Co., Ltd.; Halloysite nanotubes, provided by Angxing New Carbon Materials Changzhou Co., Ltd.; natural flake graphite (99%) , provided by Qingdao Guangyao Graphite Co., Ltd.; heavy calcium carbonate, provided by Shijiazhuang Baijiang Mineral Products Co., Ltd.; bentonite, particle size / mesh: 800 mesh, provided by Shijiazhuang Hualang Mineral Products Trading Co., Ltd.; nano zinc oxide, provided by Hebei Sanshi Chemical Products Sales Co., Ltd.; acrylic emulsion, viscosity: 200-800, provided by Zhengzhou Xinqishun Chemical Products Co., Ltd.; polydimethylsiloxane, CAS number: 9016-00-6, provided by Jingzhou Yinjie Chemical Co., Ltd.; polyoxyethylene polyoxypropylene pentaerythritol ether, purity: 99%, provided by Hubei Chengfeng Chemical Co., Ltd.

[0035] The preparation method of expandable graphite comprises the following steps: According to the mass ratio of natural flake graphite, phosphoric acid and nitric acid mixed solution and potassium permanganate being 5:15:1.5, natural flake graphite, phosphoric acid and nitric acid mixed solution (volume ratio of phosphoric acid and nitric acid is 7:3) are mixed and stirred at 25°C for 5 minutes, and then potassium permanganate is added, and the stirring reaction is continued for 2.5 hours. After the reaction is completed, deionized water (the mass of deionized water is 10 times the mass of potassium permanganate) is added for dilution, vacuum filtration (vacuum degree is -0.1MPa), and vacuum drying at 60°C for 12 hours is finally obtained to obtain expandable graphite.

[0036] Example 1 Preparation of modified intumescent flame retardant, the specific steps are: S1: According to the mass ratio of flame retardant compound and acetonitrile of 4.5:50, the flame retardant compound is added to acetonitrile and mixed evenly to obtain component A, according to the mass ratio of aminosilane and acetonitrile of 11.5:30, aminosilane is added to acetonitrile and mixed evenly to obtain component B, according to the mass ratio of component B and component A of 2:1, component B is added to component A, and then stirred and reacted at 70°C for 11 hours. After the reaction is completed, it is cooled to room temperature, filtered, centrifuged at a speed of 6000 rpm for 10 minutes, washed with acetonitrile three times (the mass of acetonitrile each time is twice the mass of the flame retardant compound), and finally vacuum dried at 60°C for 24 hours to obtain a flame retardant material, wherein the flame retardant compound is composed of pentaerythritol diphosphate and phytic acid in a mass ratio of 0.8:0.6; aminosilane is composed of 3-aminopropyltriethoxysilane and p-aminophenyltriethoxysilane in a mass ratio of 1:0.7; The preparation method of pentaerythritol diphosphoric acid comprises the following steps: A1: Pentaerythritol, phosphorus trichloride, and acetonitrile were uniformly mixed in a mass ratio of 13.5:25:95, and stirred at 65°C under a nitrogen atmosphere for 2.5 hours. The temperature was then raised to 80°C, and the stirring reaction was continued for 10.5 hours. After the reaction, the mixture was cooled to room temperature, filtered, and washed three times with anhydrous ethanol and three times with dichloromethane (the mass of anhydrous ethanol was 15% of the mass of acetonitrile each time; the mass of dichloromethane was 10% of the mass of acetonitrile each time). Finally, the mixture was vacuum dried at 50°C for 10 hours to obtain spiropentaerythritol diphosphate; A2: Add the spiropentaerythritol diphosphate chloride prepared in step A1 to acetonitrile in a mass ratio of spiropentaerythritol diphosphate chloride, acetonitrile, and deionized water of 7.5:50:5, and heat to 75°C under a nitrogen atmosphere. Then, add deionized water and stir to react for 2 hours. After the reaction is completed, cool to room temperature, filter, and wash three times with acetone and three times with acetonitrile (the mass of acetone each time is 3 times the mass of deionized water; the mass of acetonitrile each time is 2 times the mass of deionized water). Finally, vacuum dry at 50°C for 10 hours to obtain pentaerythritol diphosphate. S2: According to the mass ratio of refractory filler, Ca(NO3)2·4H2O, Al(NO3)3·9H2O and deionized water of 4.5:5:11:280, the refractory filler, Ca(NO3)2·4H2O and Al(NO3)3·9H2O were added to deionized water and stirred at room temperature for 10 minutes. The pH value of the system was adjusted to 9.5 with 1 mol / L sodium hydroxide solution, and then a hydrothermal reaction was carried out at 145°C for 19 hours. After the reaction, it was cooled to room temperature, filtered, washed with deionized water three times (the mass of each deionized water was 5% of the mass of the above deionized water), and finally vacuum dried at 55°C for 10 hours to obtain a reinforced material, wherein the refractory filler was composed of expandable graphite and halloysite nanotubes mixed in a mass ratio of 0.7:0.5; S3: According to the mass ratio of flame retardant material, ethanol and deionized water mixed solution, and reinforcing material being 0.5:90:1.8, the flame retardant material in step S1 is added to the mixed solution of ethanol and deionized water (the volume ratio of ethanol and deionized water is 49:1), and ultrasonic treatment is performed for 10 minutes (ultrasonic power is 100W, ultrasonic frequency is 40kHz), and then the reinforcing material in step S2 is added, and stirred at 75°C and 400rpm for 8 hours. After filtering, the mixture is washed with ethanol and deionized water three times each (the mass of ethanol each time is 6 times the mass of the reinforcing material, and the mass of deionized water each time is 8 times the mass of the reinforcing material), and finally vacuum dried at 55°C for 12 hours to obtain a modified intumescent flame retardant; A fireproofing material for building fire protection coating, comprising the following raw materials in parts by weight: 45 parts of acrylic emulsion, 20 parts of modified intumescent flame retardant, 5 parts of heavy calcium carbonate, 3 parts of dispersant, 1 part of defoaming agent and 20 parts of deionized water; The preparation method comprises the following steps: The raw materials were weighed in parts by mass, and the modified intumescent flame retardant, heavy calcium carbonate, dispersant and deionized water were mixed, and stirred at a speed of 1000 rpm for 35 minutes to obtain a premix. The premix was added to the acrylic emulsion, and then stirred at a speed of 500 rpm for 20 minutes. A defoaming agent was then added, and stirring was continued at a speed of 300 rpm for 10 minutes to finally obtain a building fire coating fireproof material, wherein the dispersant was composed of sodium dodecylbenzene sulfonate and sodium hexametaphosphate mixed in a mass ratio of 0.6:0.4; the defoaming agent was composed of polydimethylsiloxane and polyoxyethylene polyoxypropylene pentaerythritol ether mixed in a mass ratio of 2:1.

[0037] Example 2 Preparation of modified intumescent flame retardant, the specific steps are: S1: According to the mass ratio of flame retardant compound and acetonitrile of 4.8:55, the flame retardant compound is added to acetonitrile and mixed evenly to obtain component A, according to the mass ratio of aminosilane and acetonitrile of 11.8:35, aminosilane is added to acetonitrile and mixed evenly to obtain component B, according to the mass ratio of component B and component A of 2:1, component B is added to component A, and then stirred and reacted at 75°C for 10 hours. After the reaction is completed, it is cooled to room temperature, filtered, centrifuged at a speed of 7000 rpm for 8 minutes, washed with acetonitrile three times (the mass of acetonitrile each time is twice the mass of the flame retardant compound), and finally vacuum dried at 65°C for 24 hours to obtain a flame retardant material, wherein the flame retardant compound is composed of pentaerythritol diphosphate and phytic acid in a mass ratio of 0.85:0.65; aminosilane is composed of 3-aminopropyltriethoxysilane and p-aminophenyltriethoxysilane in a mass ratio of 1.1:0.8; The preparation method of pentaerythritol diphosphoric acid comprises the following steps: A1: Pentaerythritol, phosphorus trichloride, and acetonitrile were uniformly mixed in a mass ratio of 13.8:28:100, and stirred at 70°C under a nitrogen atmosphere for 2 hours. The temperature was then raised to 85°C and stirred for 10 hours. After the reaction, the mixture was cooled to room temperature, filtered, and washed three times with anhydrous ethanol and three times with dichloromethane (the mass of anhydrous ethanol was 15% of the mass of acetonitrile each time; the mass of dichloromethane was 10% of the mass of acetonitrile each time). Finally, the mixture was dried in vacuo at 55°C for 10 hours to obtain spiropentaerythritol diphosphate. A2: Add the spiropentaerythritol diphosphate chloride prepared in step A1 to acetonitrile in a mass ratio of spiropentaerythritol diphosphate chloride, acetonitrile, and deionized water of 8:55:6, and heat to 80°C under a nitrogen atmosphere. Then, add deionized water and stir to react for 1.5 hours. After the reaction, cool to room temperature, filter, and wash three times with acetone and three times with acetonitrile (the mass of acetone each time is 3 times the mass of deionized water; the mass of acetonitrile each time is 2 times the mass of deionized water). Finally, vacuum dry at 55°C for 10 hours to obtain pentaerythritol diphosphate. S2: According to the mass ratio of refractory filler, Ca(NO3)2·4H2O, Al(NO3)3·9H2O and deionized water of 5:5.5:11.5:300, the refractory filler, Ca(NO3)2·4H2O and Al(NO3)3·9H2O were added to deionized water and stirred at room temperature for 12 minutes. The pH value of the system was adjusted to 10 with 1 mol / L sodium hydroxide solution, and then a hydrothermal reaction was carried out at 150°C for 18 hours. After the reaction, it was cooled to room temperature, filtered, washed with deionized water three times (the mass of each deionized water was 5% of the mass of the above deionized water), and finally vacuum dried at 60°C for 10 hours to obtain a reinforced material, wherein the refractory filler was composed of expandable graphite and halloysite nanotubes mixed in a mass ratio of 0.75:0.55; S3: According to the mass ratio of flame retardant material, ethanol and deionized water mixed solution, and reinforcing material being 0.6:100:1.9, the flame retardant material in step S1 is added to the mixed solution of ethanol and deionized water (the volume ratio of ethanol and deionized water is 49:1), and ultrasonic treatment is performed for 15 minutes (ultrasonic power is 100W, ultrasonic frequency is 40kHz), and then the reinforcing material in step S2 is added, and stirred at 80°C and 500rpm for 7 hours. After filtering, the mixture is washed with ethanol and deionized water three times each (the mass of ethanol each time is 6 times the mass of the reinforcing material, and the mass of deionized water each time is 8 times the mass of the reinforcing material), and finally vacuum dried at 60°C for 12 hours to obtain a modified intumescent flame retardant; A fireproofing material for building fire protection coating, comprising the following raw materials in parts by weight: 50 parts of acrylic emulsion, 22 parts of modified intumescent flame retardant, 7 parts of bentonite, 4 parts of dispersant, 2 parts of defoaming agent and 25 parts of deionized water; The preparation method comprises the following steps: The raw materials were weighed in parts by mass, and the modified intumescent flame retardant, bentonite, dispersant and deionized water were mixed, and stirred at a speed of 1200 rpm for 30 minutes to obtain a premix. The premix was added to the acrylic emulsion, and then stirred at a speed of 600 rpm for 15 minutes. A defoaming agent was then added, and stirring was continued at a speed of 400 rpm for 8 minutes to finally obtain a building fire coating fireproof material, wherein the dispersant was composed of sodium dodecylbenzene sulfonate and sodium hexametaphosphate mixed in a mass ratio of 0.65:0.45; the defoaming agent was composed of polydimethylsiloxane and polyoxyethylene polyoxypropylene pentaerythritol ether mixed in a mass ratio of 2:1.

[0038] Example 3 Preparation of modified intumescent flame retardant, the specific steps are: S1: According to the mass ratio of flame retardant compound and acetonitrile of 5:60, the flame retardant compound is added to acetonitrile and mixed evenly to obtain component A, according to the mass ratio of aminosilane and acetonitrile of 12:40, aminosilane is added to acetonitrile and mixed evenly to obtain component B, according to the mass ratio of component B and component A of 2:1, component B is added to component A, and then stirred and reacted at 80°C for 9 hours. After the reaction is completed, it is cooled to room temperature, filtered, centrifuged at a speed of 8000 rpm for 5 minutes, washed with acetonitrile three times (the mass of acetonitrile each time is twice the mass of the flame retardant compound), and finally vacuum dried at 70°C for 24 hours to obtain a flame retardant material, wherein the flame retardant compound is composed of pentaerythritol diphosphate and phytic acid in a mass ratio of 0.9:0.7; aminosilane is composed of 3-aminopropyltriethoxysilane and p-aminophenyltriethoxysilane in a mass ratio of 1.2:0.9; The preparation method of pentaerythritol diphosphoric acid comprises the following steps: A1: Pentaerythritol, phosphorus trichloride, and acetonitrile were uniformly mixed in a mass ratio of 14:30:105, and stirred at 75°C under a nitrogen atmosphere for 1.5 hours. The temperature was then raised to 90°C and stirred for 9.5 hours. After the reaction, the mixture was cooled to room temperature, filtered, and washed three times with anhydrous ethanol and three times with dichloromethane (the mass of anhydrous ethanol was 15% of the mass of acetonitrile each time; the mass of dichloromethane was 10% of the mass of acetonitrile each time). Finally, the mixture was dried in vacuo at 60°C for 10 hours to obtain spiropentaerythritol diphosphate. A2: According to the mass ratio of spiropentaerythritol diphosphate chloride, acetonitrile, and deionized water of 8.5:60:7, the spiropentaerythritol diphosphate chloride prepared in step A1 was added to acetonitrile, and the mixture was heated to 85°C under a nitrogen atmosphere. Deionized water was then added, and the mixture was stirred for reaction for 1 hour. After the reaction, the mixture was cooled to room temperature, filtered, and washed three times with acetone and three times with acetone (the mass of acetone was 3 times the mass of deionized water each time; the mass of acetonitrile was 2 times the mass of deionized water each time). Finally, the mixture was vacuum dried at 60°C for 10 hours to obtain pentaerythritol diphosphate; S2: According to the mass ratio of refractory filler, Ca(NO3)2·4H2O, Al(NO3)3·9H2O and deionized water of 5.5:6:12:320, the refractory filler, Ca(NO3)2·4H2O and Al(NO3)3·9H2O were added to deionized water and stirred at room temperature for 15 minutes. The pH value of the system was adjusted to 10.5 with 1 mol / L sodium hydroxide solution, and then a hydrothermal reaction was carried out at 155°C for 17 hours. After the reaction, it was cooled to room temperature, filtered, washed with deionized water three times (the mass of each deionized water was 5% of the mass of the above deionized water), and finally vacuum dried at 65°C for 10 hours to obtain a reinforced material, wherein the refractory filler was composed of expandable graphite and halloysite nanotubes mixed in a mass ratio of 0.8:0.6; S3: According to the mass ratio of flame retardant material, ethanol and deionized water mixed solution, and reinforcing material being 0.7:110:2, the flame retardant material in step S1 is added to the mixed solution of ethanol and deionized water (the volume ratio of ethanol and deionized water is 49:1), and ultrasonically treated for 20 minutes (ultrasonic power of 100W, ultrasonic frequency of 40kHz), and then the reinforcing material in step S2 is added, and stirred at 85°C and 600rpm for 6 hours. After filtering, the mixture is washed with ethanol and deionized water three times each (the mass of ethanol each time is 6 times the mass of the reinforcing material, and the mass of deionized water each time is 8 times the mass of the reinforcing material), and finally vacuum dried at 65°C for 12 hours to obtain a modified intumescent flame retardant; A fireproofing material for building fire protection coating, comprising the following raw materials in parts by weight: 55 parts of acrylic emulsion, 25 parts of modified intumescent flame retardant, 8 parts of nano zinc oxide, 5 parts of dispersant, 3 parts of defoaming agent and 30 parts of deionized water; The preparation method comprises the following steps: The raw materials were weighed in parts by mass, and the modified intumescent flame retardant, nano zinc oxide, dispersant and deionized water were mixed, and stirred at a speed of 1500 rpm for 25 minutes to obtain a premix. The premix was added to the acrylic emulsion, and then stirred at a speed of 800 rpm for 10 minutes. A defoaming agent was then added, and the stirring was continued at a speed of 500 rpm for 5 minutes to finally obtain a building fire coating fireproof material, wherein the dispersant was composed of sodium dodecylbenzene sulfonate and sodium hexametaphosphate mixed in a mass ratio of 0.7:0.5; the defoaming agent was composed of polydimethylsiloxane and polyoxyethylene polyoxypropylene pentaerythritol ether mixed in a mass ratio of 2:1.

[0039] Comparative Example 1 The difference between this comparative example and Example 3 is that when preparing the modified intumescent flame retardant, the mass of the flame retardant compound in step S1 is replaced by pentaerythritol diphosphate, and the remaining steps and raw materials are the same as those in Example 3; S1: According to the mass ratio of pentaerythritol diphosphate and acetonitrile of 5:60, pentaerythritol diphosphate was added to acetonitrile and mixed evenly to obtain component A; according to the mass ratio of aminosilane and acetonitrile of 12:40, aminosilane was added to acetonitrile and mixed evenly to obtain component B; according to the mass ratio of component B and component A of 2:1, component B was added to component A, and then stirred and reacted at 80°C for 9 hours. After the reaction, it was cooled to room temperature, filtered, centrifuged at a speed of 8000 rpm for 5 minutes, washed with acetonitrile three times (the mass of acetonitrile each time was twice the mass of pentaerythritol diphosphate), and finally vacuum dried at 70°C for 24 hours to obtain a flame retardant material, wherein the aminosilane was composed of 3-aminopropyltriethoxysilane and p-aminophenyltriethoxysilane mixed in a mass ratio of 1.2:0.9.

[0040] Comparative Example 2 The difference between this comparative example and Example 3 is that, when preparing the modified intumescent flame retardant, the mass of the flame retardant compound in step S1 is replaced by phytic acid, and the remaining steps and raw materials are the same as those in Example 3; S1: According to the mass ratio of phytic acid to acetonitrile of 5:60, phytic acid was added to acetonitrile and mixed evenly to obtain component A. According to the mass ratio of aminosilane to acetonitrile of 12:40, aminosilane was added to acetonitrile and mixed evenly to obtain component B. According to the mass ratio of component B to component A of 2:1, component B was added to component A, and then stirred and reacted at 80°C for 9 hours. After the reaction, it was cooled to room temperature, filtered, centrifuged at 8000 rpm for 5 minutes, washed with acetonitrile three times (the mass of acetonitrile each time was twice the mass of phytic acid), and finally vacuum dried at 70°C for 24 hours to obtain a flame retardant material, wherein the aminosilane was composed of 3-aminopropyltriethoxysilane and p-aminophenyltriethoxysilane mixed in a mass ratio of 1.2:0.9.

[0041] Comparative Example 3 The difference between this comparative example and Example 3 is that, when preparing the modified intumescent flame retardant, the aminosilane in step S1 is replaced by 3-aminopropyltriethoxysilane, and the remaining steps and raw materials are the same as those in Example 3; S1: According to the mass ratio of flame retardant compound and acetonitrile of 5:60, the flame retardant compound is added to acetonitrile and mixed evenly to obtain component A; according to the mass ratio of 3-aminopropyltriethoxysilane and acetonitrile of 12:40, 3-aminopropyltriethoxysilane is added to acetonitrile and mixed evenly to obtain component B; according to the mass ratio of component B and component A of 2:1, component B is added to component A, and then stirred and reacted at 80°C for 9 hours. After the reaction is completed, it is cooled to room temperature, filtered, centrifuged at a speed of 8000 rpm for 5 minutes, washed with acetonitrile three times (the mass of acetonitrile each time is twice the mass of the flame retardant compound), and finally vacuum dried at 70°C for 24 hours to obtain a flame retardant material, wherein the flame retardant compound is composed of pentaerythritol diphosphate and phytic acid mixed in a mass ratio of 0.9:0.7.

[0042] Comparative Example 4 The difference between this comparative example and Example 3 is that, when preparing the modified intumescent flame retardant, the aminosilane in step S1 is replaced by p-aminophenyltriethoxysilane, and the remaining steps and raw materials are the same as those in Example 3; S1: According to the mass ratio of flame retardant compound and acetonitrile of 5:60, the flame retardant compound is added to acetonitrile and mixed evenly to obtain component A; according to the mass ratio of p-aminophenyltriethoxysilane and acetonitrile of 12:40, p-aminophenyltriethoxysilane is added to acetonitrile and mixed evenly to obtain component B; according to the mass ratio of component B and component A of 2:1, component B is added to component A, and then stirred and reacted at 80°C for 9 hours. After the reaction is completed, it is cooled to room temperature, filtered, centrifuged at a speed of 8000 rpm for 5 minutes, washed with acetonitrile three times (the mass of acetonitrile each time is twice the mass of the flame retardant compound), and finally vacuum dried at 70°C for 24 hours to obtain a flame retardant material, wherein the flame retardant compound is composed of pentaerythritol diphosphate and phytic acid mixed in a mass ratio of 0.9:0.7.

[0043] Comparative Example 5 The difference between this comparative example and Example 3 is that, when preparing the modified intumescent flame retardant, the refractory filler and other materials in step S2 are replaced with expandable graphite, and the remaining steps and raw materials are the same as those in Example 3; S2: According to the mass ratio of expandable graphite, Ca(NO3)2·4H2O, Al(NO3)3·9H2O and deionized water of 5.5:6:12:320, expandable graphite, Ca(NO3)2·4H2O and Al(NO3)3·9H2O were added to deionized water and stirred at room temperature for 15 minutes. The pH value of the system was adjusted to 10.5 with 1 mol / L sodium hydroxide solution, and then a hydrothermal reaction was carried out at 155°C for 17 hours. After the reaction, it was cooled to room temperature, filtered, washed three times with deionized water (the mass of deionized water each time was 5% of the mass of the above deionized water), and finally vacuum dried at 65°C for 10 hours to obtain a reinforced material.

[0044] Comparative Example 6 The difference between this comparative example and Example 3 is that, when preparing the modified intumescent flame retardant, the mass of the refractory filler in step S2 is replaced by halloysite nanotubes, and the remaining steps and raw materials are the same as those in Example 3; S2: According to the mass ratio of halloysite nanotubes, Ca(NO3)2·4H2O, Al(NO3)3·9H2O and deionized water of 5.5:6:12:320, halloysite nanotubes, Ca(NO3)2·4H2O and Al(NO3)3·9H2O were added to deionized water and stirred at room temperature for 15 minutes. The pH value of the system was then adjusted to 10.5 with 1 mol / L sodium hydroxide solution. The system was then hydrothermally reacted at 155°C for 17 hours. After the reaction, the system was cooled to room temperature, filtered, washed three times with deionized water (the mass of the deionized water each time was 5% of the mass of the above deionized water), and finally dried in vacuum at 65°C for 10 hours to obtain a reinforced material.

[0045] Comparative Example 7 The difference between this comparative example and Example 3 is that, when preparing the modified intumescent flame retardant, in step S3, the reinforcing material is composed of a mixture of layered double hydroxide and a refractory filler, the original step S2 is deleted, and the remaining steps and raw materials are the same as those in Example 3; S3: According to the mass ratio of flame retardant material, ethanol and deionized water mixed solution, and reinforcing material being 0.7:110:2, the flame retardant material in step S1 is added to the ethanol and deionized water mixed solution (the volume ratio of ethanol and deionized water is 49:1), and ultrasonically treated for 20 minutes (ultrasonic power is 100W, ultrasonic frequency is 40kHz), and then the reinforcing material in step S2 is added, and stirred at 85°C and 600rpm for 6 hours. After filtering, the mixture is washed with ethanol and deionized water three times each (the mass of ethanol each time is 6 times the mass of the reinforcing material, and the mass of deionized water each time is 8 times the mass of the reinforcing material), and finally vacuum dried at 65°C for 12 hours to obtain a modified intumescent flame retardant, wherein the reinforcing material is composed of a layered double hydroxide and a refractory filler mixed in a mass ratio of 1:1; the refractory filler is composed of expandable graphite and halloysite nanotubes mixed in a mass ratio of 0.8:0.6; The preparation method of layered double hydroxide comprises the following steps: According to the mass ratio of Ca(NO3)2·4H2O, Al(NO3)3·9H2O and deionized water being 11.8:9.4:100, Ca(NO3)2·4H2O and Al(NO3)3·9H2O were added to deionized water to obtain a precursor solution. According to the mass ratio of sodium carbonate, sodium hydroxide and deionized water being 1.3:6:100, sodium carbonate and sodium hydroxide were added to deionized water to obtain an alkaline solution. According to the mass ratio of alkaline solution to precursor solution being 1:1, the alkaline solution was added to the precursor solution, and stirred in a water bath at 80°C for 4h, then aged at 60°C for 24h, filtered, washed three times with deionized water (the mass of deionized water each time was twice the mass of sodium hydroxide), and finally dried in vacuum at 65°C for 10h to obtain a layered double hydroxide.

[0046] Comparative Example 8 The difference between this comparative example and Example 3 is that, when preparing the modified intumescent flame retardant, in step S3, the flame retardant material and the reinforcing material are directly mixed, and the remaining steps and raw materials are the same as those in Example 3; S3: According to the mass ratio of flame retardant material, ethanol and deionized water mixed solution, and reinforcing material being 0.7:110:2, the flame retardant material in step S1 is added to the mixed solution of ethanol and deionized water (the volume ratio of ethanol and deionized water is 49:1), and then the reinforcing material in step S2 is added, and stirred at a speed of 600 rpm at room temperature for 6 hours. After filtering, the mixture is washed with ethanol and deionized water three times each (the mass of ethanol each time is 6 times the mass of the reinforcing material, and the mass of deionized water each time is 8 times the mass of the reinforcing material), and finally vacuum dried at 65°C for 12 hours to obtain a modified intumescent flame retardant.

[0047] The flame retardant performance, fire resistance, adhesion and impact strength tests of the fire-proof building fire coating materials prepared in Examples 1-3 and Comparative Examples 1-8 were conducted; Q235 steel was used as the test substrate, and the size of the test substrates was 150×70×6 mm. The rust on the test substrate was removed and an anti-rust primer was sprayed with a thickness of 50 μm. After the anti-rust primer was touch-dried, the fire-proof building fire coating materials prepared in Examples 1-3 and Comparative Examples 1-8 were respectively coated until the coating dry film thickness was 1.2 mm, and then the performance tests were conducted; flame retardant performance test: a vertical burning rating test was conducted according to UL 94 standard, and the flame retardant performance was characterized by the vertical burning rating; fire resistance performance test: a fire resistance limit time test of the coating was conducted according to GB / T 9978.1-2008, and the fire resistance limit time was characterized by the fire resistance performance; adhesion test of the coating was conducted according to GB / T 9286-1998; impact strength test: a vertical burning rating test was conducted according to GB / T The impact strength test of the coating was carried out from 1732 to 1993. The test results are shown in Table 1 below: Table 1 Performance parameters of fire-resistant building coatings prepared in Examples 1-3 and Comparative Examples 1-8

[0048] As can be seen from the data in Table 1 above, by comparing Comparative Examples 1-4 with Example 3, the mass of the flame retardant compound in step S1 is replaced with pentaerythritol diphosphate or phytic acid, or the mass of the aminosilane in step S1 is replaced with 3-aminopropyltriethoxysilane or p-aminophenyltriethoxysilane, and finally a building fire coating fireproof material is prepared. The test results are worse than those in Example 3, indicating that the flame retardant compound composed of a mixture of pentaerythritol diphosphate and phytic acid has a synergistic effect, which can effectively improve the flame retardant properties and fire resistance of the fire-retardant coating material, and can enhance the mechanical properties and adhesion of the fire-retardant coating material; the aminosilane composed of a mixture of 3-aminopropyltriethoxysilane and p-aminophenyltriethoxysilane not only has a good bonding force with the flame retardant compound, but also can improve the dispersibility of the reinforcing material, prevent its agglomeration, and further improve the flame retardant properties, fire resistance, impact resistance and adhesion of the fire-retardant coating material; By comparing Comparative Examples 5-8 with Example 3, it can be seen that the mass of the refractory filler in step S2 is replaced by expandable graphite or halloysite nanotubes, or the reinforcing material is composed of a mixture of layered double hydroxide and a refractory filler, or the flame retardant material is directly mixed with the reinforcing material, and finally a building fire coating fireproof material is prepared. The test results are worse than those of Example 3, indicating that the refractory filler composed of a mixture of expandable graphite and halloysite nanotubes has a synergistic flame retardant effect, which can better improve the fireproofing, flame retardant and impact resistance of the fireproof coating material; by coating the refractory filler with layered double hydroxide, the dispersibility of the refractory filler can be improved, and its thermal stability and durability are enhanced, further improving the fireproofing, flame retardant and impact resistance of the fireproof coating material; the flame retardant material and the reinforcing material are chemically combined to enhance the bonding force between the two, improve the dispersibility of the reinforcing material, and better improve the flame retardant, fireproofing, impact resistance and adhesion of the fireproof coating material.

[0049] It can be seen from Table 1 above that the fire-proofing coating material for building fire protection prepared in Examples 1-3 is obtained by combining the flame retardant compound with aminosilane, compared with the fire-proofing coating material for building fire protection prepared in Comparative Examples 1-8. The flame retardant compound is combined with aminosilane to obtain a flame retardant material; the refractory filler is coated with layered double hydroxide to obtain a reinforcing material; the flame retardant material is combined with the reinforcing material to obtain a modified intumescent flame retardant; the acrylic emulsion, the modified intumescent flame retardant, the pigment filler, the dispersant, the defoaming agent and the deionized water are mixed evenly to finally obtain the fire-proofing coating material for building fire protection, which meets the test performance requirements, while the fire-proofing coating material for building fire protection prepared in Comparative Examples 1-8 does not meet the performance requirements. This shows that the fire-proofing coating material for building fire protection prepared by the present invention not only has good fire resistance, flame retardant performance and mechanical properties, but also enhances the adhesion between the fire-proof coating material and the substrate, has good environmental protection, and has good comprehensive performance.

[0050] Throughout the specification, references to terms such as "one embodiment," "example," or "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0051] The above contents are merely examples and explanations of the present invention. Those skilled in the art may make various modifications or additions to the described specific embodiments or replace them in similar ways. As long as they do not deviate from the invention or exceed the scope defined by the present invention, they should all fall within the scope of protection of the present invention.

Claims

1. A fireproofing material for building fire protection coating, characterized in that: The invention comprises the following raw materials in parts by weight: 45-55 parts of acrylic emulsion, 20-25 parts of modified intumescent flame retardant, 5-8 parts of pigment and filler, 3-5 parts of dispersant, 1-3 parts of defoaming agent and 20-30 parts of deionized water; The preparation method of the modified intumescent flame retardant comprises the following steps: S1: flame retardant material is obtained by combining flame retardant compound with aminosilane; S2: Reinforced material is obtained by coating refractory filler with layered double hydroxide; S3: combining the flame retardant material in step S1 with the reinforcing material in step S2 to obtain a modified intumescent flame retardant.

2. A fireproofing material for building fire protection coating according to claim 1, characterized in that: Step S1 is specifically as follows: The flame retardant compound is added to acetonitrile and mixed evenly to obtain component A. Aminosilane is added to acetonitrile and mixed evenly to obtain component B. Component B is added to component A, and then stirred and reacted at 70-80° C. for 9-11 hours. After the reaction is completed, it is cooled to room temperature, filtered, centrifuged for 5-10 minutes, washed with acetonitrile, and finally vacuum dried at 60-70° C. to obtain a flame retardant material.

3. A fireproofing material for building fire protection coating according to claim 2, characterized in that: The aminosilane is prepared by mixing 3-aminopropyltriethoxysilane and p-aminophenyltriethoxysilane in a mass ratio of 1-1.2:0.7-0.

9.

4. A fireproof coating material for building fire protection according to claim 2, characterized in that: The flame retardant compound is prepared by mixing pentaerythritol diphosphate and phytic acid in a mass ratio of 0.8-0.9:0.6-0.

7.

5. A fireproofing material for building fire protection coating according to claim 4, characterized in that: The preparation method of the pentaerythritol diphosphoric acid comprises the following steps: A1: Pentaerythritol, phosphorus trichloride, and acetonitrile are uniformly mixed and stirred at 65-75°C under a nitrogen atmosphere for 1.5-2.5 hours. The temperature is then raised to 80-90°C and the stirring reaction is continued for 9.5-10.5 hours. After the reaction is completed, the mixture is cooled to room temperature, filtered, washed with anhydrous ethanol and dichloromethane, and finally dried in vacuo at 50-60°C to obtain spiropentaerythritol diphosphate chloride. A2: Add the spirocyclic pentaerythritol diphosphate chloride prepared in step A1 to acetonitrile, and heat to 75-85°C under a nitrogen atmosphere. Then add deionized water and stir to react for 1-2 hours. After the reaction is completed, cool to room temperature, filter, wash with acetone and acetonitrile, and finally dry in vacuo at 50-60°C to obtain pentaerythritol diphosphate.

6. A fireproofing material for building fire protection coating according to claim 1, characterized in that: Step S2 is specifically as follows: Add refractory filler, Ca(NO3)2·4H2O, and Al(NO3)3·9H2O to deionized water and stir at room temperature for 10-15 minutes. Then adjust the pH value of the system to 9.5-10.5 with sodium hydroxide solution, and then carry out hydrothermal reaction at 145-155°C for 17-19 hours. After the reaction is completed, cool to room temperature, filter, wash with deionized water, and finally vacuum dry at 55-65°C to obtain a reinforced material.

7. A fireproofing material for building fire protection coating according to claim 6, characterized in that: The refractory filler is composed of expandable graphite and halloysite nanotubes mixed in a mass ratio of 0.7-0.8:0.5-0.

6.

8. A fireproofing material for building fire protection coating according to claim 1, characterized in that: Step S3 is specifically as follows: The flame retardant material in step S1 is added to a mixed solution of ethanol and deionized water and ultrasonically treated for 10-20 minutes. Then, the reinforcing material in step S2 is added and stirred at 75-85° C. for 6-8 hours. The mixture is filtered, washed with ethanol and deionized water, and finally vacuum dried at 55-65° C. to obtain a modified intumescent flame retardant.

9. A fireproofing material for building fire protection coating according to claim 1, characterized in that: The dispersant is composed of sodium dodecylbenzenesulfonate and sodium hexametaphosphate mixed in a mass ratio of 0.6-0.7:0.4-0.

5.

10. A method for preparing a fireproofing material for building fire protection coating according to any one of claims 1 to 9, characterized in that: The following steps are involved: Weigh parts by mass of raw materials, mix a modified intumescent flame retardant, pigments and fillers, a dispersant and deionized water, and stir at a speed of 1000-1500 rpm for 25-35 minutes to obtain a premix, add the premix to an acrylic emulsion, and then stir at a speed of 500-800 rpm for 10-20 minutes, then add a defoaming agent, and continue stirring at a speed of 300-500 rpm for 5-10 minutes to finally obtain a building fire coating fireproof material.

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