CN110317510B

CN110317510B - Intumescent fire-retardant coating and preparation method thereof

Info

Publication number: CN110317510B
Application number: CN201910722958.4A
Authority: CN
Inventors: 汤弢; 张金玲
Original assignee: Sunman Tai Cold Chain Technology Shaoxing Co ltd; Chunjun New Materials Shenzhen Co Ltd
Current assignee: Sunman Tai Cold Chain Technology Shaoxing Co ltd; Chunjun New Materials Shenzhen Co Ltd
Priority date: 2019-08-06
Filing date: 2019-08-06
Publication date: 2022-03-25
Anticipated expiration: 2039-08-06
Also published as: CN110317510A

Abstract

The present disclosure provides an intumescent fire retardant coating comprising: the fire-retardant coating comprises a polyorganosiloxane emulsion, a base resin emulsion, a carbonizing agent, a flame-retardant foaming agent, a nitrogen-containing foaming agent, a prophase foaming agent, an expanding agent, a defoaming agent, a wetting dispersant, a film-forming assistant and a filler, wherein in the fire-retardant coating, the mass percentage of the polyorganosiloxane emulsion is 3-10%; the mass percent of the base resin emulsion is 10-17%; the mass percent of the carbonizing agent is 11-18%; the mass percentage of the flame-retardant foaming agent is 20-30%; the mass percentage of the nitrogen-containing foaming agent is 10-20%; the mass percent of the early foaming agent is 0.3-0.6%; the mass percentage of the expanding agent is not more than 5 percent; the mass percent of the defoaming agent is 0.2 to 0.4 percent; the mass percent of the wetting dispersant is 0.5 percent to 1.5 percent; the mass percent of the film-forming additive is 0.1 to 0.5 percent; the mass percentage of the filler is 10 to 25 percent. According to the present disclosure, a fire retardant coating material capable of extending a fire-resistant time and improving fire-retardant properties can be provided.

Description

Intumescent fire-retardant coating and preparation method thereof

Technical Field

The disclosure particularly relates to an intumescent fire retardant coating and a preparation method thereof.

Background

In the building industry, the fireproof coating is coated on the surface of the inflammable material of a building, so that the fireproof capacity of the inflammable material can be effectively improved, and the spread of flame is slowed down. Such fire-retardant coatings are sometimes also referred to as flame retardant coatings. In particular, mechanical strength, mechanical properties, etc. of building materials such as steel materials commonly used in buildings are reduced with increasing temperature, and easily lose their supporting ability, resulting in collapse of the buildings. Therefore, the materials are subjected to fire protection, the materials can be effectively prevented from being rapidly heated in a fire disaster to reduce the strength, and the collapse of a building caused by the loss of the supporting capacity is avoided.

Patent literature (CN101205441A) proposes a fire retardant coating suitable for steel structures and a preparation method thereof, which comprises polyorganosiloxane, self-crosslinking polyacrylate composite emulsion, fire retardant additive, filler and film forming additive, wherein the fire retardant additive is ammonium polyphosphate, melamine phosphate, melamine and pentaerythritol; the filler is titanium dioxide, sepiolite and aluminum silicate fiber. In the fireproof coating, the ratio of the components is expressed by mass concentration as follows: 2-10 wt% of polysiloxane, 10-18 wt% of self-crosslinking polyacrylate composite emulsion, 19-35 wt% of ammonium polyphosphate, 1-5 wt% of melamine phosphate, 12-24 wt% of melamine, 10-20 wt% of pentaerythritol, 0.1-0.5 wt% of early foaming agent, 1-7 wt% of titanium dioxide, 3-5 wt% of sepiolite, 0.5-1 wt% of aluminum silicate fiber and 0.1-0.5 wt% of film-forming assistant.

However, although the fire retardant coating materials disclosed in the above patent documents improve the fire retardant performance of steel structures, the fire retardant coating materials have a short fire retardant time and poor fire retardant performance due to the disadvantages of uneven foaming and poor adhesion to steel substrates in the carbonized foam layer formed during combustion of the fire retardant coating materials in actual fires.

Disclosure of Invention

The present disclosure has been made in view of the above-described state of the art, and an object thereof is to provide an intumescent fire retardant coating material which can extend the fire-resistant time and improve the fire-resistant performance.

To this end, the present disclosure provides, in one aspect, an intumescent fire retardant coating comprising: the fireproof coating comprises a polyorganosiloxane emulsion, a base resin emulsion, a carbonizing agent, a flame-retardant foaming agent, a nitrogen-containing foaming agent, a prophase foaming agent, an expanding agent, a defoaming agent, a wetting dispersant, a film-forming assistant and a filler, wherein in the fireproof coating, the mass percentage of the polyorganosiloxane emulsion is 3-10%; the mass percent of the base resin emulsion is 10-17%; the mass percent of the carbonizing agent is 11-18%; the mass percentage of the flame-retardant foaming agent is 20-30%; the mass percentage of the nitrogen-containing foaming agent is 10-20%; the mass percentage of the early foaming agent is 0.3-0.6%; the mass percentage of the expanding agent is not more than 5 percent; the mass percent of the defoaming agent is 0.2-0.4%; the mass percent of the wetting dispersant is 0.5 to 1.5 percent; the mass percent of the film-forming additive is 0.1-0.5%; the mass percentage of the filler is 10-25%.

Among the fire-retardant coatings of the present disclosure, in particular, polyorganosiloxane emulsions have good thermal oxidation resistance and low surface energy, and form film-forming substances having good film-forming properties, thermal oxidation resistance and rheological properties together with the binder resin emulsion, thereby enabling the fire-retardant coatings to have strong adhesive strength with the base material (e.g., steel material) of a building, and the film-forming substances in a molten state even when burned have good viscoelasticity and are not easily detached from the base material. In addition, the carbonization agent, the flame-retardant foaming agent, the nitrogen-containing foaming agent, the early foaming agent, the expanding agent, the defoaming agent, the wetting dispersant, the film forming assistant, the filler and the like in the fireproof coating act together to bubble and expand the molten film forming substance to form a foam carbonization layer which is used as an effective heat insulation layer, so that the burning resistance time of the fireproof coating is prolonged, and the fireproof performance of the fireproof coating is improved.

In addition, in the fire retardant coating according to an aspect of the present disclosure, optionally, the polyorganosiloxane emulsion is at least one selected from a polydimethylsiloxane emulsion, an epoxy-modified polysiloxane emulsion, an aminodimethylpolysiloxane emulsion, and a carboxyl hydrocarbon-modified polysiloxane emulsion. Thus, the polyorganosiloxane emulsion and the base resin emulsion can form a film-forming material with good film-forming properties.

In addition, in the fire retardant coating according to an aspect of the present disclosure, optionally, the base resin emulsion includes a self-crosslinking polyacrylate, an epoxy resin, and a polyurethane resin, and a mass ratio of the self-crosslinking polyacrylate, the epoxy resin, and the polyurethane resin is 3: 1 to 10: 2: 1. Thus, the base resin emulsion can be crosslinked with the polyorganosiloxane emulsion to form a film-forming material having good film-forming properties.

In addition, in the fire retardant coating according to an aspect of the present disclosure, optionally, the expanding agent is at least one selected from expanded perlite, expanded graphite, and expanded vermiculite, and the particle size of the expanding agent is 300 to 600 mesh. This contributes to thickening of the carbonized foam layer formed of the film-forming substance during combustion and to improvement of the thermal oxidation resistance of the carbonized foam layer.

In addition, in the fire retardant coating according to an aspect of the present disclosure, optionally, the wetting dispersant includes a wetting agent and a dispersant, the wetting agent is a polyfunctional polymer alkylol ammonium salt solution, the dispersant is a high molecular weight block copolymer solution, and a mass ratio of the wetting agent to the dispersant is 1: 1.6 to 1: 2.8. This enables the components in the fireproof coating to be mixed more uniformly without reducing the water resistance of the fireproof coating.

Further, in the fire retardant coating according to an aspect of the present disclosure, optionally, the defoaming agent is a silicone defoaming agent or a mineral oil defoaming agent. This can suppress the generation of bubbles in the fireproof coating material.

In addition, in the fireproof coating according to an aspect of the present disclosure, optionally, the filler includes a preservative, a catalyst, a flame retardant aid, a reinforcing agent, and a heat insulating material, wherein the preservative is at least one selected from aluminum hydroxide, modified iron oxide, zinc phosphate, and zinc borate, the catalyst is titanium dioxide, the flame retardant aid is nano magnesium hydroxide, the reinforcing agent is at least one selected from sepiolite, aluminum silicate fiber, and hydrotalcite, and the heat insulating material is at least one selected from hollow ceramic microbeads, glass beads, and silica. Under the condition, the preservative can improve the anti-corrosion effect of the fireproof coating on the base material, the catalyst can promote the formation of the foam carbonization layer, the flame-retardant auxiliary agent can generate a synergistic flame-retardant effect with the expanded graphite, the reinforcing agent can perform a synergistic catalytic effect and can be used as an inorganic framework to reinforce the foam carbonization layer, and the heat-insulating material can generate heat reflection efficiency, so that the fireproof performance of the fireproof coating can be effectively improved.

In addition, in the fire retardant coating material according to an aspect of the present disclosure, optionally, a mass ratio of the preservative, the catalyst, the flame retardant aid, the reinforcing agent, and the heat insulating material is 5: 10: 30: 2: 5 to 5: 30: 45: 12: 10. This can further improve the fire-retardant performance of the fire-retardant coating material.

Another aspect of the present disclosure provides a method of preparing an intumescent fire retardant coating, comprising: (a) preparing a polyorganosiloxane emulsion, a base resin emulsion, a carbonizing agent, flame-retardant foaming, a nitrogen-containing foaming agent, a prophase foaming agent, an expanding agent, a defoaming agent, a wetting dispersant, a film-forming assistant and a filler as raw materials; (b) mixing a flame-retardant foaming agent, a carbonizing agent, a nitrogen-containing foaming agent, a filler, an expanding agent, a wetting dispersant, a defoaming agent, a polyorganosiloxane emulsion and a base resin emulsion to form a mixed solution; and (c) adding an early-stage foaming agent, a film-forming assistant and a defoaming agent into the mixed solution, and stirring to form a fireproof coating, wherein the polyorganosiloxane emulsion accounts for 3-10% by mass in the fireproof coating; the mass percent of the base resin emulsion is 10-17%; the mass percent of the carbonizing agent is 11-18%; the mass percentage of the flame-retardant foaming agent is 20-30%; the mass percentage of the nitrogen-containing foaming agent is 10-20%; the mass percentage of the early foaming agent is 0.3-0.6%; the mass percentage of the expanding agent is not more than 5 percent; the mass percent of the defoaming agent is 0.2-0.4%; the mass percent of the wetting dispersant is 0.5 to 1.5 percent; the mass percent of the film-forming additive is 0.1-0.5%; the mass percentage of the filler is 10-25%.

In another aspect of the present disclosure, the above raw materials are added and mixed in a predetermined mass percentage, whereby a fireproof coating material having an extended burning resistance time and improved fireproof performance can be obtained.

In the method for producing a fire retardant coating material according to another aspect of the present disclosure, optionally, in the step (b), the wet dispersant and the defoaming agent are first mixed to form a first mixed solution, then the polyorganosiloxane emulsion and the base resin emulsion are added to the first mixed solution and mixed to form a second mixed solution, and then the flame retardant foaming agent, the carbonizing agent, the nitrogen-containing foaming agent, the filler, and the expanding agent are added to the second mixed solution to form the mixed solution. Under the condition, the wetting dispersant can remove water films and water vapor on the surfaces of the polyorganosiloxane emulsion and the base resin emulsion, so that the components in the fireproof coating can be dispersed in the preparation process, and the fireproof coating with better fireproof performance can be prepared.

According to the present disclosure, an intumescent fire retardant coating that extends fire resistance time and has improved fire resistance properties, and a method for preparing the same can be provided.

Drawings

Fig. 1 is a schematic flow diagram illustrating a method of preparing an intumescent fire retardant coating to which the present disclosure relates.

Fig. 2 is a schematic flow chart showing the formation of a mixed solution in the method for preparing the fire retardant coating material shown in fig. 1.

Detailed Description

Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In the following description, the same components are denoted by the same reference numerals, and redundant description thereof is omitted. The drawings are schematic and the ratio of the dimensions of the components and the shapes of the components may be different from the actual ones.

In this embodiment, the intumescent fire retardant coating may include: the foaming agent comprises a polyorganosiloxane emulsion, a base resin emulsion, a carbonizing agent, a flame-retardant foaming agent, a nitrogen-containing foaming agent, a prophase foaming agent, an expanding agent, a defoaming agent, a wetting dispersant, a film-forming assistant and a filler. In the fire-retardant coating, the mass percent of the polysiloxane emulsion can be 3-10%; the mass percent of the base resin emulsion can be 10-17%; the mass percent of the carbonizing agent can be 11-18%; the mass percentage of the flame-retardant foaming agent can be 20% to 30%; the mass percentage of the nitrogen-containing foaming agent can be 10-20%; the mass percentage of the early foaming agent can be 0.3-0.6%; the mass percentage of the expanding agent can be not more than 5 percent; the mass percent of the defoaming agent can be 0.2% to 0.4%; the mass percent of the wetting dispersant can be 0.5 to 1.5 percent; the mass percent of the film-forming aid can be 0.1% to 0.5%; the mass percentage of the filler may be 10% to 25%.

The intumescent fire retardant coating material according to the present embodiment, particularly the polyorganosiloxane emulsion, has good thermal oxidation resistance and low surface energy, and forms a film-forming substance having good film-forming properties, thermal oxidation resistance and rheological properties together with the binder resin emulsion, so that the fire retardant coating material can have strong adhesive strength with a base material (for example, steel material) of a building, and the film-forming substance in a molten state even when burned has good viscoelasticity and is less likely to fall off from the base material. In addition, the carbonization agent, the flame-retardant foaming agent, the nitrogen-containing foaming agent, the early foaming agent, the expanding agent, the defoaming agent, the wetting dispersant, the film forming assistant, the filler and the like in the fireproof coating act together to bubble and expand the molten film forming substance to form a foam carbonization layer which is used as an effective heat insulation layer, so that the burning resistance time of the fireproof coating is prolonged, and the fireproof performance of the fireproof coating is improved.

In the present embodiment, the film forming property refers to a property of bringing particles of a film forming substance together gradually to form irreversible mutual contact, and then deforming the particles until the particles reach the closest packed state to form a film. In some examples, during film formation, the silicone in the polyorganosiloxane emulsion can crosslink with the epoxy groups in the binder resin emulsion, and the crosslinked product can serve as a film-forming material.

In some examples, the polyorganosiloxane emulsion may be at least one selected from the group consisting of a polydimethylsiloxane emulsion, an epoxy-modified polysiloxane emulsion, an aminodimethylpolysiloxane emulsion, and a carboxyl hydrocarbon-modified polysiloxane emulsion. Thus, the polyorganosiloxane emulsion and the base resin emulsion can form a film-forming material with good film-forming properties.

In some examples, the weight percent of the polysiloxane emulsion in the fire-blocking coating can be 3% to 10%, for example 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, etc. In addition, in some examples, the weight percent of the polysiloxane emulsion may be preferably 5% to 8% from the standpoint of forming a better film-forming material.

In some examples, the base resin emulsion may include a self-crosslinking polyacrylate, an epoxy resin, and a urethane resin, and a mass ratio of the self-crosslinking polyacrylate, the epoxy resin, and the urethane resin may be 3: 1 to 10: 2: 1. Thus, the base resin emulsion can be crosslinked with the polyorganosiloxane emulsion to form a film-forming material having good film-forming properties. In addition, in some examples, the mass ratio of the self-crosslinking polyacrylate, the epoxy resin, and the urethane resin may be preferably 3: 1 to 5: 1.

In some examples, the base resin emulsion may be 10% to 17% by mass in the fire retardant coating, for example, the base resin emulsion may be 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, etc. In addition, in some examples, the base resin emulsion may be preferably 11 to 13% by mass in view of forming a better film-forming material.

In some examples, the base resin emulsion may be composed of a self-crosslinking polyacrylate, an epoxy resin, and a polyurethane resin, and the mass ratio of the self-crosslinking polyacrylate, the epoxy resin, and the polyurethane resin may be 3: 1 to 10: 2: 1.

In some examples, the polyorganosiloxane emulsion and the binder resin emulsion may be formed together as a film-forming material. Wherein the film-forming substance can be formed into a foamed carbonized layer by melting and then bubbling and expanding by releasing gas through decomposition of the foaming agent. In addition, in some examples, the melting temperature of the film-forming material may have a different melting temperature depending on the ratio between the polyorganosiloxane emulsion and the binder resin emulsion. Specifically, it may be 250 ℃ to 400 ℃. For example, the melting temperature of the film-forming material may be 250 ℃, 280 ℃, 300 ℃, 330 ℃, 350 ℃, 380 ℃, 400 ℃ or the like. In addition, the melting temperature of the film-forming material may preferably be 300 ℃ to 350 ℃ from the viewpoint of better matching with the decomposition temperature of the blowing agent to form a good foamy char layer.

In some examples, the viscosity of the film-forming material when molten can be from 20 to 60 dpa.s. For example, the viscosity of the film-forming material when molten may have different melt viscosities depending on the molecular weights of the polyorganosiloxane emulsion and the binder resin emulsion. Specifically, it may be 20dPa.s, 22dPa.s, 25dPa.s, 28dPa.s, 30dPa.s, 32dPa.s, 35dPa.s, 38dPa.s, 40dPa.s, 50dPa.s, 60dPa.s, or the like. In addition, in some examples, the viscosity of the film-forming material when molten may be 35dpa.s to 40dpa.s, preferably from the viewpoint of forming a better foamed char layer.

In the embodiment, the film forming material can absorb heat from the outside in the processes of melting and expanding, decomposing the carbonizing agent and the like, so that the temperature near the surface of the base material is reduced, and the fireproof and temperature reduction is facilitated.

In some examples, the carbonizing agent may be at least one selected from among pentaerythritol, dipentaerythritol, tripentaerythritol, polypentaerythritol, triethylene glycol, sorbitol, glycerol, trimethylolmethane, trimethylolpropane, diethylene glycol, and the like, polyvalent alcohols. Therefore, the carbonizing agent can be dehydrated at high temperature to form a flame-retardant skeleton, so that the foam carbonized layer is formed into a loose structure.

In some examples, the mass percent of the carbonizing agent may be 11% to 18% in the fire retardant coating, for example the mass percent of the carbonizing agent may be 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, etc. In addition, in some examples, the mass percentage of the carbonizing agent may be 13% to 17%, preferably from the viewpoint of forming a better foamed carbonized layer.

In some examples, the fire retardant coating may include multiple foaming agents. This enables the formation of a more satisfactory foamy char layer. For example, the fire retardant coating may include a flame retardant blowing agent, a nitrogen-containing blowing agent, and a pre-blowing agent, i.e., the flame retardant blowing agent, the nitrogen-containing blowing agent, and the pre-blowing agent may collectively function as a blowing agent for the fire retardant coating. In addition, in some examples, the decomposition temperature of the blowing agent matches the melting temperature of the film-forming substance, in other words, the decomposition temperature of the blowing agent is close to the melting temperature of the film-forming substance, thereby enabling the blowing agent to form the film-forming substance in a molten state into a foamed carbonized layer in time. In addition, the flame-retardant gas released by the decomposition of the foaming agent in the fireproof coating can dilute the oxygen concentration on the surface of the base material, so that the combustion-supporting oxygen can be reduced, and the flame-retardant effect is improved.

In some examples, the flame retardant blowing agent may include high polymerization degree ammonium polyphosphate, melamine phosphate. In this case, the melamine phosphate has good char-forming properties and foaming properties, and can reduce precipitation of ammonium polyphosphate having a high degree of polymerization after dissolving in water. Therefore, a good foam carbonization layer can be formed, and the fireproof performance of the fireproof coating can be improved.

In some examples, the high polymerization degree ammonium polyphosphate may have a polymerization Degree (DP) of 100 to 1100. For example, the degree of polymerization of the high-polymerization ammonium polyphosphate may be 100, 200, 300, 400, 500, 600, 700, 800, 900, 1000, 1100, or the like. In some examples, the high polymerization degree ammonium polyphosphate may have a polymerization degree of 1000 to 1100, preferably from the viewpoint of forming a better foam char layer.

In some examples, the mass ratio of the high polymerization degree ammonium polyphosphate to the melamine phosphate in the flame retardant foaming agent may be 1: 1 to 1: 2. For example, the mass ratio of the high polymerization degree ammonium polyphosphate to the melamine phosphate may be 1: 1, 1: 1.2, 1: 1.5, 1: 1.8, 1: 2, etc.

In some examples, the mass percentage of the flame retardant blowing agent may be 20% to 30%, for example the mass percentage of the flame retardant blowing agent may be 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, etc. In addition, in some examples, the flame retardant blowing agent may be present in an amount of 22 to 24% by mass, preferably from the viewpoint of forming a better foamed char layer.

In some examples, the flame retardant blowing agent may be comprised of high polymerization degree ammonium polyphosphate, melamine phosphate.

In some examples, the nitrogen-containing blowing agent may be selected from at least one of nitrogen-containing compounds such as urea, urea formaldehyde, melamine, butyl melamine, trimethylol melamine, glycine, and the like. In this case, the nitrogen-containing foaming agent can decompose nonflammable gases (such as nitrogen, carbon dioxide, etc.) at high temperature to perform a foaming expansion function to form a high-quality foam carbonized layer, and a large amount of nonflammable gases can dilute oxygen components, reduce combustion-supporting oxygen, and further improve the flame retardant effect, thereby further improving the fire resistance of the fire retardant coating. Additionally, in some examples, the nitrogen-containing blowing agent may preferably be melamine.

In some examples, the nitrogen-containing blowing agent may be 10 to 20% by mass in the fire-blocking coating, for example, the nitrogen-containing blowing agent may be 15%, 15.5%, 16%, 16.5%, 17%, 17.5%, 18%, 18.5%, 19%, 19.5%, 20%, etc. In addition, in some examples, the nitrogen-containing blowing agent may preferably be 15 to 18 mass% from the viewpoint of forming a better foamed char layer.

In some examples, the pre-foaming agent may be selected from at least one of an optional chlorinated paraffin, azodicarbonamide, monoammonium phosphate, microcapsule type foaming agent. Under the condition, the foaming of the fireproof coating in the early stage of heating can be improved, so that the foam carbonization layer is dense and thickened, and the fire resistance limit can be improved. In addition, the early foaming agent can reduce the cavities of the foam carbonization layer caused by the melt flow of the film forming material, and is favorable for forming a uniform foam carbonization layer.

In some examples, the mass percentage of the early foaming agent in the fire retardant coating may be 0.3% to 0.6%, for example the mass percentage of the early foaming agent may be 0.3%, 0.32%, 0.35%, 0.38%, 0.4%, 0.42%, 0.45%, 0.48%, 0.5%, 0.55%, 0.6%, etc. In addition, in some examples, the mass percentage of the early blowing agent may be preferably 0.35% to 0.4% from the viewpoint of forming a better foamed char layer.

In some examples, the swelling agent may be at least one selected from expanded perlite, expanded graphite, and expanded vermiculite, and the particle size of the swelling agent may be 300 mesh to 600 mesh. This contributes to thickening of the carbonized foam layer formed of the film-forming substance during combustion and to improvement of the thermal oxidation resistance of the carbonized foam layer. In addition, the expansion agent has a high expansion ratio. In addition, the expanding agent can improve the toughness of the carbonized foam layer, and thus can better withstand the impact of fire, wind, and the like.

In some examples, the particle size of the bulking agent can be 300 mesh, 350 mesh, 400 mesh, 450 mesh, 500 mesh, 550 mesh, 600 mesh, and the like. In addition, preferably, the particle size of the swelling agent may be 500 to 600 mesh for better angle of the foam carbonized layer.

In some examples, the mass percent of the intumescent agent may not exceed 5% in the fire-blocking coating, for example the mass percent of the intumescent agent may be 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, etc. In other examples, the mass percentage of the expanding agent may be preferably 3% to 5% from the viewpoint of forming a better foamed carbonized layer. Additionally, in some examples, no intumescent agent may be included in the fire retardant coating.

In some examples, the wetting dispersant may include a wetting agent which may be a polyfunctional polymer alkylol ammonium salt solution and a dispersant which may be a high molecular weight block copolymer solution, and the mass ratio of the wetting agent to the dispersant may be 1: 1.6 to 1: 2.8. This enables the components in the fireproof coating to be mixed more uniformly without reducing the water resistance of the fireproof coating. For example, the mass ratio of the wetting agent to the dispersing agent may be 1: 1.6, 1: 1.8, 1: 2.0, 1: 2.2, 1: 2.4, 1: 2.6, 1: 2.8, etc. In addition, in some examples, from the viewpoint of forming a better wetting dispersant, it may be preferable that the mass ratio of the wetting agent to the dispersant is 1: 2.0 to 1: 2.6.

In some examples, the mass percent of the wetting dispersant may be 0.5% to 1.5% in the fire retardant coating, for example the mass percent of the wetting dispersant may be 0.5%, 0.8%, 1%, 1.2%, 1.5%, etc. In addition, in some examples, from the viewpoint of forming better dispersion of the components in the fireproof coating, it may be preferable that the mass percentage of the wetting dispersant be 0.8% to 1.2%.

In some examples, the wetting and dispersing agent may be composed of a wetting agent and a dispersing agent, and the mass ratio of the wetting agent to the dispersing agent may be 1: 1.6 to 1: 2.8.

In some examples, optionally, the defoamer is a silicone defoamer or a mineral oil defoamer. This can suppress the generation of bubbles in the fireproof coating material. In some examples, the silicone antifoaming agent may be one selected from the group consisting of dimethyl silicone oil, long-chain alkyl silicone oil antifoaming agent, fluorocarbon-based silicone oil, polyether silicone oil.

In some examples, the mass percent of the defoamer in the fire retardant coating can be 0.2% to 0.4%, e.g., the mass percent of the defoamer can be 0.2%, 0.22%, 0.25%, 0.3%, 0.32%, 0.35%, 0.4%, etc. In addition, in some examples, from the viewpoint of being able to better suppress the generation of bubbles in the fireproof coating, it is preferable that the mass percentage of the defoaming agent may be 0.25% to 0.3%.

In some examples, the coalescent may be selected from at least one of 2, 2, 4-trimethyl-1, 3-pentanediol-acrylic acid monomethylene, propylene glycol, dipropylene glycol methyl ether, dipropylene glycol butyl ether. This can further improve the film forming properties of the fire retardant coating.

In some examples, the film-forming aid can be 0.1 to 0.5% by mass in the fire-retardant coating, for example the film-forming aid can be 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, etc. In addition, in some examples, from the viewpoint of forming a better improvement in the film-forming property of the fire retardant coating, it is preferable that the mass percentage of the film-forming aid may be 0.2% to 0.4%.

In some examples, optionally, the filler includes a preservative, a catalyst, a flame retardant aid, a reinforcing agent, and a thermal insulation material, wherein the preservative is at least one selected from aluminum hydroxide, modified iron oxide, zinc phosphate, and zinc borate, the catalyst is titanium dioxide, the flame retardant aid is nano magnesium hydroxide, the reinforcing agent is at least one selected from sepiolite, aluminum silicate fiber, and hydrotalcite, and the thermal insulation material is at least one selected from hollow ceramic microbeads, glass beads, and silica. Under the condition, the preservative can improve the anti-corrosion effect of the fireproof coating on the base material, the catalyst can promote the formation of the foam carbonization layer, the flame-retardant auxiliary agent can generate a synergistic flame-retardant effect with the expanded graphite, the reinforcing agent can perform a synergistic catalytic effect and can be used as an inorganic framework to reinforce the foam carbonization layer, and the heat-insulating material can generate heat reflection efficiency, so that the fireproof performance of the fireproof coating can be effectively improved. In addition, the fireproof coating can form a heat-insulating foam carbonization layer which covers the surface of the base material and can block heat conduction and oxygen.

In some examples, the catalyst may also be zinc oxide. Additionally, in some examples, aluminum hydroxide may also serve as a flame retardant aid.

In some examples, the mass percent of the filler can be 10% to 25%, e.g., the mass percent of the filler can be 10%, 12%, 15%, 18%, 20%, 22%, 25%, etc. In addition, in some examples, the filler may preferably be present in an amount of 10 to 15% by mass, from the viewpoint of forming a better foamed char layer.

In some examples, the mass ratio of the preservative, the catalyst, the flame retardant aid, the reinforcing agent, and the heat insulating material may be 5: 10: 30: 2: 5 to 5: 30: 45: 12: 10. This can further improve the fire-retardant performance of the fire-retardant coating material.

In some examples, the fire retardant coating may also include a pigment. In this case, the fire retardant coating can be both made to exhibit decorative colors and improved in physical and chemical properties. In some examples, the pigment may be at least one selected from titanium dioxide, zinc oxide, lithopone, iron oxide, lead chrome yellow, zinc chrome yellow, cadmium yellow, iron black, chromium oxide green, lead chrome green, cobalt blue, ultramarine, carbon black, phthalocyanine blue, alcohol-soluble fast red.

In some examples, the filler may be composed of a preservative, a catalyst, a flame retardant aid, a reinforcing agent, and a heat insulating material.

In some examples, the fire retardant coating may be composed of a polyorganosiloxane emulsion, a binder resin emulsion, a carbonizing agent, a flame retardant foaming agent, a nitrogen-containing foaming agent, a pre-foaming agent, an expanding agent, a defoaming agent, a wetting dispersant, a film forming aid, and a filler.

In some examples, the viscosity of the fire retardant coating may be 30 to 100 dpa.s. For example, the viscosity of the fire retardant coating can be 30dpa.s, 32dpa.s, 35dpa.s, 38dpa.s, 40dpa.s, 45dpa.s, 50dpa.s, 55dpa.s, 60dpa.s, 65dpa.s, 70dpa.s, 75dpa.s, 80dpa.s, 90dpa.s, 100dpa.s, and the like. In addition, in some examples, the viscosity of the fire retardant coating may preferably be 35 to 40dpa.s for better application angle to the substrate surface.

In some examples, the bond strength of the fire retardant coating can be 0.2MPa to 0.8 MPa. For example, the bonding strength of the fireproof coating can be 0.2MPa, 0.25MPa, 0.3MPa, 0.35MPa, 0.4MPa, 0.45MPa, 0.5MPa, 0.55MPa, 0.6MPa, 0.65MPa, 0.7MPa, 0.75MPa, 0.8MPa, and the like.

In some examples, the fire-blocking coating can be applied to the substrate surface by dipping, curtain coating, painting, spin coating, brushing, spraying, knife coating, and the like. Additionally, in some examples, the substrate coated with the fire retardant coating may be a steel structure.

In some examples, the steel structure may be surface treated prior to applying the fire retardant coating. For example, the surface of the steel structure may be degreased, derusted, and the like. In some examples, the surface of the steel structure may be degreased by selecting at least one of petroleum spirit No. 200, turpentine, trichloroethylene, tetrachloroethylene, carbon tetrachloride, dichloromethane, trichloroethane, and trifluorotrichloroethane, thereby enabling to enhance adhesion of the fire retardant coating to the steel structure. Additionally, in some examples, methods of rust removal include manual sanding, mechanical rust removal, and the like. Therefore, the rust on the surface of the steel structure can be removed, and the service life of the fireproof coating is prolonged.

In some examples, the thickness of the fire retardant coating on the surface of the steel structure is 2mm, the thickness of the foam carbonized layer may be 30mm to 50mm, and the fire resistant time may be 90 minutes to 120 minutes. For example, when the thickness of the coating layer of the fireproof coating on the surface of the steel structure is 2mm, the thickness of the foamed carbonized layer may be 50mm, the fire resistance time may be 120 minutes, and the like.

The intumescent fire retardant coating according to the present embodiment does not release harmful gas or components when it expands at high temperature to form a foamy char layer, and the foamy char layer has a low thermal conductivity as a heat insulating layer, and can exhibit a good heat insulating effect.

Fig. 1 is a schematic flow diagram illustrating a method of preparing an intumescent fire retardant coating to which the present disclosure relates. Fig. 2 is a schematic flow chart showing the formation of a mixed solution in the method for preparing the fire retardant coating material shown in fig. 1.

As shown in fig. 1, in the present embodiment, a method for preparing an intumescent fire retardant coating may include: preparing a polyorganosiloxane emulsion, a base resin emulsion, a carbonizing agent, a flame-retardant foaming agent, a nitrogen-containing foaming agent, a pre-foaming agent, an expanding agent, a defoaming agent, a wetting dispersant, a film-forming aid and a filler as raw materials (step S10); mixing a flame-retardant foaming agent, a carbonizing agent, a nitrogen-containing foaming agent, a filler, an expanding agent, a wetting dispersant, a defoaming agent, a polyorganosiloxane emulsion and a base resin emulsion to form a mixed solution (step S20); and the former stage foaming agent, the film forming assistant and the defoaming agent are added to the mixed solution and stirred to form the fireproof paint (step S30).

In the method for producing an intumescent fire retardant coating material according to the present embodiment, the above-mentioned raw materials are added and mixed in predetermined mass percentages, whereby a fire retardant coating material having an extended burning resistance time and improved fire resistance can be obtained.

In some examples, the formulation of the fire retardant coating may be: in the fireproof coating, the mass percent of the polyorganosiloxane emulsion is 3-10%; the mass percent of the base resin emulsion is 10-17%; the mass percent of the carbonizing agent is 11-18%; the mass percentage of the flame-retardant foaming agent is 20-30%; the mass percentage of the nitrogen-containing foaming agent is 10-20%; the mass percent of the early foaming agent is 0.3-0.6%; the mass percentage of the expanding agent is not more than 5 percent; the mass percent of the defoaming agent is 0.2 to 0.4 percent; the mass percent of the wetting dispersant is 0.5 percent to 1.5 percent; the mass percent of the film-forming additive is 0.1 to 0.5 percent; the mass percentage of the filler is 10 to 25 percent. The filler may include, among other things, preservatives, catalysts, flame retardant aids, reinforcing agents, and thermal insulation materials.

In some examples, in step S10, the polyorganosiloxane emulsion, the base resin emulsion, the carbonizing agent, the flame-retardant foaming agent, the nitrogen-containing foaming agent, the pre-foaming agent, the expanding agent, the defoaming agent, the wetting dispersant, the film-forming aid, and the filler may be weighed as raw materials according to the above-described formulation.

In some examples, the defoaming agent may be divided into two parts before step S20, and used in step S20 and step S30, respectively. Additionally, in some examples, the ratio of the anti-foaming agent used in steps S20 and S30 may be 2: 3 to 1: 1.

In some examples, as shown in fig. 2, in step S20, a wetting dispersant is first mixed with a defoaming agent to form a first mixed solution (step S21), then a polyorganosiloxane emulsion and a base resin emulsion are added to the first mixed solution to mix them to form a second mixed solution (step S22), and then a flame retardant foaming agent, a carbonizing agent, a nitrogen-containing foaming agent, a filler, and an expanding agent are added to the second mixed solution to form a mixed solution (step S23). Under the condition, the wetting dispersant can remove water films and water vapor on the surfaces of the polyorganosiloxane emulsion and the base resin emulsion, so that the components in the fireproof coating can be dispersed in the preparation process, and the fireproof coating with better fireproof performance can be prepared.

In some examples, in step S21, the wetting dispersant and the defoaming agent may be stirred to form a first mixed solution. For example, the wetting dispersant and the defoaming agent may be placed in a high-speed disperser to be rapidly dispersed (rapidly stirred) for a certain period of time. In addition, in some examples, the specific time for the high speed disperser to rapidly disperse may be 15 minutes to 25 minutes, and the rotational speed of the high speed disperser may be 1000r/min to 1500 r/min. For example, the specific time for the high-speed disperser to rapidly disperse can be 15 minutes, 18 minutes, 20 minutes, 22 minutes or 25 minutes, and the rotating speed of the high-speed disperser can be 1000r/min, 1100r/min, 1200r/min, 1300r/min, 1400r/min, 1500r/min, etc.

In some examples, in step S22, the polyorganosiloxane emulsion and the binder resin emulsion may be added to the first mixed solution and stirred to form a second mixed solution. In addition, in some examples, the polyorganosiloxane emulsion and the binder resin emulsion are added to the first mixed solution and stirred to form a second mixed solution which is uniformly mixed.

In some examples, the flame retardant foaming agent, the carbonizing agent, the nitrogen-containing foaming agent, the filler, and the expanding agent may be sequentially ground and mixed before step S23, wherein the preservative, the flame retardant aid, the catalyst, the reinforcing agent, and the heat insulating material may be sequentially ground and mixed when the filler is ground. For example, the flame-retardant foaming agent, the carbonizing agent, the nitrogen-containing foaming agent, the preservative, the flame-retardant auxiliary, the catalyst, the reinforcing agent, the heat insulating material, and the expanding agent may be sequentially placed in a ball mill to be ground and uniformly mixed. In addition, in some examples, the flame retardant foaming agent, the carbonizing agent, the nitrogen-containing foaming agent, the preservative, the flame retardant aid, the catalyst, the reinforcing agent, the heat insulating material, and the expanding agent may be separately ground and then uniformly mixed. In the present embodiment, the order of sequentially grinding the flame-retardant foaming agent, the carbonizing agent, the nitrogen-containing foaming agent, the preservative, the flame-retardant auxiliary, the catalyst, the reinforcing agent, the heat insulating material, and the expanding agent is not limited to this, and may be arbitrarily set.

In some examples, in step S23, after adding the flame retardant foaming agent, the carbonizing agent, the nitrogen-containing foaming agent, the filler, and the expanding agent to the second mixed solution, the mixed solution may be formed by stirring or grinding. For example, in step S23, the flame retardant foaming agent, the carbonizing agent, the nitrogen-containing foaming agent, the filler, and the expanding agent may be added to the second mixed solution, and then the mixture may be stirred to form a mixed solution.

In some examples, in step S23, after adding the ground powder ground and mixed by the flame retardant foaming agent, the carbonizing agent, the nitrogen-containing foaming agent, the filler, and the expanding agent to the second mixed liquid, the second mixed liquid may be ground in a grinder for a predetermined time to form a mixed liquid or may be dispersed (stirred) at a high speed in a high-speed dispersing machine for a predetermined time to form a mixed liquid.

In other examples, the predetermined time of stirring or milling may be 15 minutes to 25 minutes, for example, the predetermined time of stirring or milling may be 15 minutes, 18 minutes, 20 minutes, 22 minutes, or 25 minutes. The rotation speed of the high-speed disperser may be 2000r/min, 2100r/min, 2200r/min, 2300r/min, 2400r/min, 2500r/min, or the like.

In some examples, in step S30, the mixture solution is stirred with the former foaming agent, the film forming aid and the defoamer to form a uniformly mixed fire retardant coating. For example, stirring may be carried out in a high-speed disperser until homogeneous.

In some examples, unmilled flame retardant blowing agents, carbonization agents, nitrogen-containing blowing agents, fillers, and expansion agents may also be added to the mixed liquor in step S30.

To further illustrate the present disclosure, the intumescent fire retardant coating provided by the present disclosure and the preparation method thereof are described in detail below with reference to examples, and the beneficial effects achieved by the present disclosure are fully illustrated with reference to comparative examples.

[ examples ] A method for producing a compound

In examples 1 to 5 of the present disclosure, for the preparation raw materials of the fire retardant coating, polydimethylsiloxane emulsion is used as polyorganosiloxane emulsion, self-crosslinking polyacrylate emulsion, epoxy resin emulsion and polyurethane resin emulsion are mixed as base resin emulsion, pentaerythritol is used as carbonizing agent, high polymerization degree ammonium polyphosphate (DP 1000) and melamine phosphate are mixed as fire retardant foaming agent, melamine is used as nitrogen-containing foaming agent, chlorinated paraffin is used as early-stage foaming agent, expanded graphite is used as expanding agent, propylene glycol is used as film forming aid, polyfunctional polymer alkylol ammonium salt solution and high molecular weight block copolymer solution are used as wetting dispersing agent, aluminum hydroxide, modified iron oxide, zinc phosphate and zinc borate are used as antiseptic, nano magnesium hydroxide is used as fire retardant aid, titanium dioxide is used as catalyst, hollow ceramic bead is used as reinforcing agent, sepiolite is used as a heat insulating material.

In addition, in the fireproof coating, the mass ratio of the self-crosslinking polyacrylate emulsion, the epoxy resin emulsion and the polyurethane resin emulsion is 4: 1, and the mass ratio of the high-polymerization-degree ammonium polyphosphate (DP 1000) to the melamine phosphate is 1: 1, the mass ratio of the wetting agent to the dispersing agent is 1: 2, the mass ratio of the preservative, the catalyst, the flame-retardant auxiliary agent, the reinforcing agent to the heat-insulating material is 1: 2: 6: 0.4: 1, wherein the mass ratio of the aluminum hydroxide, the modified iron oxide, the zinc phosphate and the zinc borate is 2: 2: 1: 0.5.

in each of examples 1 to 5, first, a raw material was prepared by weighing each component in the compounding ratio shown in table 1, and the total mass of the raw material was 100 kg. And then, dispersing the wetting dispersant and 50 percent of organic silicon defoamer in the raw materials in a high-speed dispersion machine for 20 minutes at the rotating speed of 1200r/min, fully mixing, adding the polyorganosiloxane emulsion and the base resin emulsion, and mixing until the mixture is uniformly mixed to form the emulsion material. And simultaneously, adding 50% of flame-retardant foaming agent, carbonizing agent, nitrogen-containing foaming agent, preservative, flame-retardant auxiliary agent, catalyst, reinforcing agent, heat-insulating material and expanding agent into a ball mill in sequence for grinding for 2 hours, and uniformly mixing to form powder. And then, adding the emulsion and the powder into a sand mill, grinding for 20min, adding the rest 50% of flame-retardant foaming agent, carbonizing agent, nitrogen-containing foaming agent, preservative, flame-retardant auxiliary agent, catalyst, reinforcing agent, heat-insulating material and expanding agent, the early-stage foaming agent, film-forming auxiliary agent and the rest 50% of organic silicon defoaming agent, fully stirring until the mixture is uniform, and finally obtaining the fireproof coating sample.

5kg of the fire retardant coating samples in the embodiments 1 to 5 are taken respectively, and the fire retardant coating is coated on the surface of steel, and the thickness of the coating after drying is 3 mm. Next, the fire-retardant coatings prepared by the formulations of examples 1 to 5 were tested according to the test method of the fire protection technical specification GB51249-2017 of the construction steel structure, respectively, in terms of the adhesive strength, the thickness of the foam char layer, the fire-resistant time, and the like. The results of the tests are shown in table 3.

TABLE 1 raw material ratios for preparing fire-retardant coating

[ COMPARATIVE EXAMPLES ]

Comparative examples 1 to 5 compared with the above examples, except that in comparative examples 1 to 5, the respective components were weighed as the preparation raw materials of the fire retardant coating in the compounding ratios shown in table 2, the fire retardant coating was prepared in the same manner as in the examples.

Similarly, 5kg of the fire retardant coating samples of comparative examples 1 to 5 were taken, respectively, and the fire retardant coating was coated on the surface of the steel material to a thickness of 3mm after drying. Then, the fireproof coatings prepared by the formulas of comparative examples 1 to 5 are tested according to the testing method of the fire protection technical specification GB51249-2017 of the building steel structure respectively in terms of bonding strength, thickness of a foam charring layer, fire resistance time and the like. The results of the tests are shown in table 3.

TABLE 2 raw material ratios for preparing fire-retardant coating

TABLE 3 fire behavior of the fire-retardant coating

As can be seen from table 3, the fire-retardant coatings in examples 1 to 5 have the advantages of high bonding strength, long fire-retardant time, and high expansion factor (i.e., large thickness of the carbonized foam layer) compared to the comparative examples, and therefore, the fire-retardant coatings in the examples have better fire-retardant performance and are not easy to fall off, and the fire-retardant time can be prolonged, thereby obviously improving the fire-retardant performance. In the above examples, example 3 had the best overall performance in fire performance.

In contrast, the fire-retardant coatings of comparative examples 1 to 5 cannot achieve the fire-retardant properties of the fire-retardant coatings of examples 1 to 5, while having a good balance among the adhesive strength, the fire-retardant time, and the expansion factor.

While the present disclosure has been described in detail above with reference to the drawings and the embodiments, it should be understood that the above description does not limit the present disclosure in any way. Those skilled in the art can make modifications and variations to the present disclosure as needed without departing from the true spirit and scope of the disclosure, which fall within the scope of the disclosure.

Claims

1. An intumescent fire retardant coating characterised in that: the flame-retardant polyurethane foaming agent is composed of a polyorganosiloxane emulsion, a base resin emulsion, a carbonizing agent, a flame-retardant foaming agent, a nitrogen-containing foaming agent, a prophase foaming agent, an expanding agent, a defoaming agent, a wetting dispersant, a film-forming assistant and a filler, wherein the base resin emulsion is composed of self-crosslinking polyacrylate, epoxy resin and polyurethane resin, the mass ratio of the self-crosslinking polyacrylate, the epoxy resin and the polyurethane resin is 3: 1 to 10: 2: 1, the flame-retardant foaming agent is composed of high-polymerization-degree ammonium polyphosphate and melamine phosphate, the polymerization degree of the high-polymerization-degree ammonium polyphosphate is 1000 to 1100, and the mass ratio of the high-polymerization-degree ammonium polyphosphate to the melamine phosphate is 1: 1 to 1: 2; the filler comprises a preservative, a catalyst, a flame-retardant aid, a reinforcing agent and a heat-insulating material, wherein the preservative is at least one selected from aluminum hydroxide, modified iron oxide, zinc phosphate and zinc borate, the catalyst is titanium dioxide, the flame-retardant aid is nano magnesium hydroxide, the reinforcing agent is at least one selected from sepiolite, aluminum silicate fiber and hydrotalcite, and the heat-insulating material is at least one selected from hollow ceramic microspheres, glass bead balls and silica; and in the fireproof coating, the mass percent of the polyorganosiloxane emulsion is 3-10%; the mass percent of the base resin emulsion is 10-17%; the mass percent of the carbonizing agent is 11-18%; the mass percentage of the flame-retardant foaming agent is 20-30%; the mass percentage of the nitrogen-containing foaming agent is 10-20%; the mass percentage of the early foaming agent is 0.3-0.6%; the mass percentage of the expanding agent is not more than 5 percent; the mass percent of the defoaming agent is 0.2-0.4%; the mass percent of the wetting dispersant is 0.5 to 1.5 percent; the mass percent of the film-forming additive is 0.1-0.5%; the mass percentage of the filler is 10-25%.

2. A fire retardant coating as defined in claim 1, wherein:

the polysiloxane emulsion is at least one selected from polydimethylsiloxane emulsion, epoxy modified polysiloxane emulsion, amino dimethyl polysiloxane emulsion and carboxyl alkyl modified polysiloxane emulsion.

3. A fire retardant coating as defined in claim 1, wherein:

the expanding agent is at least one selected from expanded perlite, expanded graphite and expanded vermiculite, and the particle size of the expanding agent is 300-600 meshes.

4. A fire retardant coating as defined in claim 1, wherein:

the wetting and dispersing agent comprises a wetting agent and a dispersing agent, wherein the wetting agent is a polyfunctional polymer alkylol ammonium salt solution, the dispersing agent is a high molecular weight block copolymer solution, and

the mass ratio of the wetting agent to the dispersing agent is 1: 1.6 to 1: 2.8.

5. A fire retardant coating as defined in claim 1, wherein:

the defoaming agent is an organic silicon defoaming agent or a mineral oil defoaming agent.

6. A fire retardant coating as defined in claim 1, wherein:

the mass ratio of the preservative, the catalyst, the flame-retardant auxiliary agent, the reinforcing agent and the heat-insulating material is 5: 10: 30: 2: 5 to 5: 30: 45: 12: 10.

7. A preparation method of an intumescent fire retardant coating is characterized by comprising the following steps:

the method comprises the following steps:

(a) preparing a polyorganosiloxane emulsion, a base resin emulsion, a carbonizing agent, a flame retardant foaming agent, a nitrogen-containing foaming agent, a prophase foaming agent, an expanding agent, a defoaming agent, a wetting dispersant, a film forming aid and a filler as raw materials, wherein the base resin emulsion is composed of self-crosslinking polyacrylate, epoxy resin and polyurethane resin, the mass ratio of the self-crosslinking polyacrylate, the epoxy resin and the polyurethane resin is 3: 1 to 10: 2: 1, the flame retardant foaming agent is composed of high-polymerization-degree ammonium polyphosphate and melamine phosphate, the polymerization degree of the high-polymerization-degree ammonium polyphosphate is 1000 to 1100, and the mass ratio of the high-polymerization-degree ammonium polyphosphate to the melamine phosphate is 1: 1 to 1: 2; the filler comprises a preservative, a catalyst, a flame-retardant aid, a reinforcing agent and a heat-insulating material, wherein the preservative is at least one selected from aluminum hydroxide, modified iron oxide, zinc phosphate and zinc borate, the catalyst is titanium dioxide, the flame-retardant aid is nano magnesium hydroxide, the reinforcing agent is at least one selected from sepiolite, aluminum silicate fiber and hydrotalcite, and the heat-insulating material is at least one selected from hollow ceramic microspheres, glass bead balls and silica;

(b) mixing a flame-retardant foaming agent, a carbonizing agent, a nitrogen-containing foaming agent, a filler, an expanding agent, a wetting dispersant, a defoaming agent, a polyorganosiloxane emulsion and a base resin emulsion to form a mixed solution; and is

(c) Adding the early foaming agent, the film forming auxiliary agent and the defoaming agent into the mixed solution, stirring to form the fireproof coating,

in the fireproof coating, the mass percent of the polyorganosiloxane emulsion is 3-10%; the mass percent of the base resin emulsion is 10-17%; the mass percent of the carbonizing agent is 11-18%; the mass percentage of the flame-retardant foaming agent is 20-30%; the mass percentage of the nitrogen-containing foaming agent is 10-20%; the mass percentage of the early foaming agent is 0.3-0.6%; the mass percentage of the expanding agent is not more than 5 percent; the mass percent of the defoaming agent is 0.2-0.4%; the mass percent of the wetting dispersant is 0.5 to 1.5 percent; the mass percent of the film-forming additive is 0.1-0.5%; the mass percentage of the filler is 10-25%.

8. The method of claim 7, wherein:

in the step (b), firstly, a wetting dispersant and a defoaming agent are mixed to form a first mixed solution, then, a polyorganosiloxane emulsion and a base resin emulsion are added into the first mixed solution to be mixed to form a second mixed solution, and then, a flame-retardant foaming agent, a carbonizing agent, a nitrogen-containing foaming agent, a filler and an expanding agent are added into the second mixed solution to form the mixed solution.