Indoor intumescent steel structure aerogel fire retardant coating and preparation method and application thereof

Abstract

The invention relates to an indoor intumescent steel structure aerogel fire retardant coating and a preparation method and application thereof. The indoor intumescent steel structure aerogel fire retardant coating comprises the following components by weight: 5-15 parts of white pigment, 8-15 parts of carbon former, 0.25-1 part of reinforcing agent, 12-35 parts of binder, 0.1-0.3 part of thickener, 0.3-0.5 part of bactericide, 0.1-0.3 part of pH value regulator, 0.2-0.5 part of defoamer, 0.3-1 part of dispersant, 0.5-5 parts of aerogel material and 15-35 parts of water. The fire retardant coating provided by the invention has good flame retardancy and corrosion resistance, is a fully aqueous system, is a product without artificially added toxic and harmful substances such as formaldehyde and benzene series, can improve the fire resistance level of buildings, protect steel structures from deformation and melting, and has good application prospects.

Description

Technical Field

[0001] The invention relates to the technical field, and in particular to an indoor expanding steel structure aerogel fire retardant coating and a preparation method and application thereof. Background Art

[0002] Steel structure buildings are an important part of modern industrialized buildings. They have the characteristics of high strength, good stability, and fast construction speed. Therefore, they are widely used in large factories, shopping malls, gymnasiums, bridges and other buildings. However, the material of steel structure makes it face great danger in the event of a fire, because steel can easily lose its load-bearing capacity at high temperatures, causing the risk of building collapse. Therefore, in order to prevent steel structures from losing their load-bearing capacity in a fire, countries have been researching and developing fire-retardant coatings, which can protect steel structures from damage in the event of a fire. Fire-retardant coatings are a type of coating containing special materials that can wrap steel structures in a layer of flame-retardant materials, making them less susceptible to high temperatures in the event of a fire, thereby protecting the safety of the building.

[0003] Aerogel is a new type of material with a nanoporous grid structure, and the pores are filled with gaseous dispersion medium, an ultra-low density solid material, sometimes also called "solid smoke" or "frozen smoke". Its porosity can reach more than 99.9%, and its special physical structure gives it many amazing properties, such as extremely low thermal conductivity, very low density, high specific surface area and excellent acoustic and optical properties. Aerogel is widely used in thermal insulation, oil absorption, electronics, building materials, thermal stabilizers and other fields. There are many types of aerogels, including silicon, carbon, sulfur, metal oxide, metal, etc. The most common aerogel is silicon aerogel. At present, the production technology of silica aerogel is the most mature and the degree of industrialization is the highest. It is a nanoporous super insulation material with practical value, and also has good thermal insulation and mechanical properties. It is mainly used in thermal insulation in aerospace, military, electronics, construction, home appliances and industrial pipelines. Compared with SiO2 aerogel materials, ZrO2 aerogel has lower high-temperature thermal conductivity and is more suitable for thermal insulation applications in high-temperature ranges. It has great application potential as a high-temperature thermal insulation material. The pore size of ZrO2 aerogel material is smaller than the mean free path of air molecules. There is no air convection in the aerogel, the porosity is extremely high, and the volume ratio of solids is very low, which makes the thermal conductivity of the aerogel very low. However, its preparation process is relatively complicated.

[0004] Indoor intumescent steel structure aerogel fire retardant coating is applied on the surface of steel structure. The coating itself has good corrosion resistance, safety, environmental protection, no pollution, and convenient construction. It is an ideal fireproof decorative material for steel structure. When encountering fire, a chemical reaction will occur, and the coating will expand rapidly to form a dense carbon layer with a thickness of 30-100 times the original. The heat insulation and flame retardant effect is significant, thereby effectively preventing high temperature flames from burning the building, playing a good protective role, and winning precious time for personnel to escape and extinguish the fire.

[0005] CN113150671A discloses a non-ionic waterborne polyurethane-based intumescent steel structure fire retardant coating, comprising the following components by weight: 10-40 parts of deionized water, 0.1-0.5 parts of defoamer, 0.5-2 parts of dispersant, 0.1-0.5 parts of pH value regulator, 5-15 parts of rutile titanium dioxide, 5-15 parts of pentaerythritol, 5-15 parts of melamine, 20-30 parts of ammonium polyphosphate, 0.5-5 parts of aerogel slurry, 15-40 parts of non-ionic waterborne polyurethane emulsion, 1-10 parts of acetic acid vesicle emulsion, 0.5-5 parts of triethanolamine acetate aqueous solution, and 0.3-1 parts of thickener. The invention provides a fire retardant coating, which is only a non-ionic waterborne polyurethane-based intumescent steel structure fire retardant coating with a single foaming function, and the preparation process is complicated.

[0006] Therefore, in view of the above shortcomings, it is necessary to provide a new type of fire retardant coating and then apply it. Summary of the invention

[0007] The technical problem to be solved by the present invention is the flame retardancy, heat insulation and high temperature stability of the existing aerogel fire retardant coating. Aiming at the defects in the prior art, an indoor intumescent steel structure aerogel fire retardant coating and a preparation method and application thereof are provided.

[0008] In order to solve the above technical problems, the present invention provides an indoor expandable steel structure aerogel fire retardant coating, wherein the indoor expandable steel structure aerogel fire retardant coating comprises the following components in parts by weight:

[0009] 5-15 parts of white pigment, 8-15 parts of carbon former, 0.25-1 parts of reinforcing agent, 12-35 parts of binder, 0.1-0.3 parts of thickener, 0.3-0.5 parts of bactericide, 0.1-0.3 parts of pH regulator, 0.2-0.5 parts of defoaming agent, 0.3-1 parts of dispersant, 0.5-5 parts of aerogel material, and 15-35 parts of water.

[0010] Compared with other existing fire retardant coatings, the indoor expandable steel structure aerogel fire retardant coating provided by the present invention not only has a high foaming function, but also has excellent thermal insulation effect, extremely low density and non-flammability of aerogel materials, which can be well distributed in the carbon layer, thereby making the carbon layer denser, and has excellent thermal insulation performance, which effectively blocks the heat of the flame from being transferred to the surface of the steel structure, greatly delays the deformation time of the steel structure material, and provides valuable time for fire rescue.

[0011] The weight portion of the white pigment of the present invention is 5 to 15 parts, for example, 5 parts, 8 parts, 9 parts, 12 parts or 15 parts. In the present invention, the white pigment can be any white pigment conventionally used in the art. The white pigment mainly provides hiding power, for example, it can be anatase or rutile titanium dioxide, zinc white, lead white, zinc oxide, lithopone and other materials.

[0012] The weight proportion of the carbon-forming agent of the present invention is 8 to 15 parts, for example, 8 parts, 9 parts, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts or 15 parts.

[0013] Preferably, the carbon-forming agent is any one of dipentaerythritol, starch or pentaerythritol, or a combination of at least two thereof, preferably dipentaerythritol.

[0014] The carbonizing agent is preferably dipentaerythritol from Jinshengtai Chemical. Compared with pentaerythritol and starch, its decomposition temperature is closer to the selected dehydrating agent, and it has better water resistance and alkali resistance, and will not cause crystallization or precipitation from the coating. Dipentaerythritol has high carbonizing efficiency, good carbonizing effect, higher foaming multiple, better fireproof performance, better dispersibility and finer texture.

[0015] The enhancer of the present invention is 0.25 to 1 part, for example, it can be 0.25 part, 0.3 part, 0.5 part, 0.7 part, 0.75 part or 1 part.

[0016] Preferably, the reinforcing agent is expanded graphite. Expanded graphite is a loose, porous, flaky or granular material obtained by intercalation, washing, drying and high-temperature expansion of natural graphite flakes. In addition to the excellent properties of natural graphite itself, such as resistance to cold and heat, corrosion resistance and self-lubrication, it also has the characteristics of softness, toughness, compression resilience, adsorption, ecological environment coordination, biocompatibility and other properties that natural graphite does not have. Expanded graphite can instantly expand 150 to 300 times in volume when exposed to high temperature, changing from granular to worm-like, so that the structure is loose, porous and curved, the surface area is enlarged, the surface energy is increased, the adsorption force is enhanced, and the worm-like graphites can be self-interlocked, which increases the strength, toughness, resilience and plasticity of the carbon layer of the system, thereby increasing the fastness and strength of the carbon layer and preventing it from loosening, cracking or falling off.

[0017] The weight proportion of the binder of the present invention is 12 to 35 parts, for example, 12 parts, 15 parts, 20 parts, 25 parts or 35 parts.

[0018] Preferably, the binder is any one of Wacker's EZ3006 emulsion, Badford RS-166 emulsion, Baolijia BLJ-3359 emulsion, Clariant DM230 emulsion or Beijing Organic Chemical BJ-707 pure acrylic emulsion, preferably Clariant DM230 emulsion. In the present invention, the binder is most preferably Clariant DM230 emulsion, which is relatively better than other emulsions in terms of compatibility, water resistance, foaming multiple, carbon layer density, thermal insulation, adhesion and other comprehensive properties of aerogel fire retardant coatings.

[0019] The weight portion of the thickener of the present invention is 0.1 to 0.3 parts, for example, 0.1 parts, 0.2 parts or 0.3 parts. Preferably, the thickener is hydroxyethyl cellulose. Compared with the alkali swelling thickener, polyurethane thickener and hydroxymethyl cellulose conventionally used in the art, the hydroxyethyl cellulose used in the present invention has the best viscosity stability and high thickening efficiency.

[0020] The weight portion of the fungicide of the present invention is 0.3 to 0.5 parts, for example, it can be 0.3 parts, 0.4 parts or 0.5 parts.

[0021] Preferably, the fungicide is any one of chloromethylisothiazolinone, methylisothiazolinone, octylisothiazolinone or benzisothiazolinone, or a combination of at least two thereof.

[0022] The pH adjuster of the present invention has an amount of 0.1 to 0.3 parts by weight, such as 0.1 parts, 0.2 parts or 0.3 parts.

[0023] Preferably, the pH adjuster is any one of 2-amino-2-methyl-1-propanol, sodium hydroxide or ammonia water, or a combination of at least two of them.

[0024] The weight portion of the defoaming agent of the present invention is 0.2 to 0.5 parts, for example, it can be 0.2 parts, 0.3 parts, 0.4 parts or 0.5 parts.

[0025] Preferably, the defoaming agent is SN-NXZ.

[0026] The weight portion of the dispersant of the present invention is 0.3 to 1 part, for example, it can be 0.3 part, 0.5 part, 0.8 part or 1 part.

[0027] Preferably, the dispersant is any one of P90, GA40, and OROTAN 1124, or a combination of at least two thereof, preferably P90. In the present invention, the dispersant preferably uses Coatex P90, which has better dispersibility and storage stability, higher dispersion efficiency, better water resistance, and wider color matching tolerance than other dispersants, such as Dow OROTAN 1124 and BASF GA40.

[0028] The weight portion of the aerogel material of the present invention is 0.5 to 5 parts, for example, it can be 0.5 parts, 1 parts, 3 parts or 5 parts.

[0029] Preferably, the aerogel material is ZrO2 aerogel. In the present invention, ZrO2 aerogel material has lower high-temperature thermal conductivity than materials such as silicon-based aerogel, sulfur-based aerogel, carbon-based aerogel and 3M hollow glass microspheres, and is more suitable for thermal insulation applications in high-temperature sections (combustion foaming), that is, it has better thermal insulation performance and density for the carbon layer, and has minimal effect on fire resistance. The dosage is preferably 0.75% of the total weight of the aerogel fire retardant coating. If it is too low, the thermal insulation performance of the carbon layer will not be significantly improved; if it is too high, the thermal insulation performance of the carbon layer will be limited, and the cost will be increased, the foaming multiple and the density of the carbon layer will be reduced, thereby affecting the fire resistance, and it is easy to crack.

[0030] Preferably, the aerogel material preferably uses ZrO2 aerogel produced by Alison.

[0031] Preferably, the indoor expandable steel structure aerogel fire retardant coating also includes 10 to 20 parts of a foaming agent, for example, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, 17.5 parts, 20 parts, etc.

[0032] Preferably, the foaming agent is melamine.

[0033] Preferably, the indoor intumescent steel structure aerogel fire retardant coating further includes 15 to 45 parts of a dehydrating agent, for example, 15 parts, 20 parts, 25 parts, 30 parts, 35 parts or 45 parts.

[0034] Preferably, the dehydrating agent is modified ammonium polyphosphate EPFR-APP262.

[0035] The dehydrating agent of the present invention is preferably the modified ammonium polyphosphate EPFR-APP262 of Preniphor, which is a high-polymerization crystalline type II ammonium polyphosphate product wrapped with melamine formaldehyde resin based on PreniphorTM EPFR-APP222H. Compared with other existing products on the market, the ammonium polyphosphate of Hangzhou Jieersi, Shandong Hui'an, and Shandong Poly Chemical has lower water solubility at room temperature, and even has low water solubility at high temperature, and is completely insoluble in organic solvents. The product has high content of P and N flame retardant elements, good thermal stability, is nearly neutral, non-toxic and low-smoke, and cooperates with other gas sources and carbon sources to expand into charcoal to play a better flame retardant and fireproof role.

[0036] In the present invention, a carbonizing agent is combined with a foaming agent and a dehydrating agent to form a three-system intumescent fire-retardant coating. The lack of one component will result in failure to foam. The preferred amount of the carbonizing agent is 12.5%, and the preferred amount of the foaming agent is 17.5%. If the amount is too low, the foaming multiple will be low and the flame retardant effect will be poor. If the amount is too high, the foaming multiple will not be significantly improved, but the cost will be increased, and the thermal insulation performance of the foamed carbon layer will be reduced.

[0037] Preferably, the indoor intumescent steel structure aerogel fire retardant coating further includes 0.1 to 0.5 parts of a wetting agent, for example, 0.1 parts, 0.2 parts, 0.3 parts, 0.4 parts or 0.5 parts.

[0038] Preferably, the wetting agent is any one of BD-109, NS-2125, E9289, LCN070, and NS-2599, or a combination of at least two thereof; preferably, a combination of BD-109 and NS-2125. BD-109 is a Dow brand, and NS-2125 is a Hairun Chemical brand.

[0039] In the present invention, the wetting agent is preferably Dow BD-109 and NS-2125, with a mass ratio of 1:1. Compared with BASF E9289, Clariant LCN070 and the like used alone or in combination, the wetting effect is the best, the uniform dispersion effect of aerogel powder is the best, the viscosity is stable in the system, there is no viscosity growth phenomenon, and the color matching tolerance is higher.

[0040] In a second aspect, the present invention provides a method for preparing the indoor expandable steel structure aerogel fire retardant coating according to the first aspect, the preparation method comprising: uniformly dispersing and mixing white pigment, carbonizing agent, reinforcing agent, binder, thickener, bactericide, pH regulator, defoaming agent, dispersant, aerogel material, and optional dehydrating agent, foaming agent and wetting agent to obtain the indoor expandable steel structure aerogel fire retardant coating.

[0041] In a third aspect, the present invention provides an application of the indoor expanding steel structure aerogel fire retardant coating as described in the first aspect in indoor steel structure decoration.

[0042] The implementation of the present invention has the following beneficial effects:

[0043] (1) Flame retardancy: Expandable steel structure fire retardant coating is made of a mixture of various high-performance chemical materials. It is easy to foam when a fire occurs. The foamed carbon layer is highly dense and strong. The addition of materials such as ZrO2 aerogel makes the carbon layer more dense and solid, with good flame retardancy and heat insulation properties, which can effectively prevent the spread of fire.

[0044] (2) Corrosion resistance: The intumescent steel structure fire retardant coating forms a dense protective layer on the surface of the steel structure, effectively protecting the steel structure from corrosion. At the same time, it has good acid, alkali and salt spray resistance, is not easily affected by the environment, and can meet high-level anti-corrosion requirements when used with anti-rust primer.

[0045] (3) It is a fully water-based system, without artificially added toxic and harmful substances such as formaldehyde and benzene. The limit of harmful substances complies with the provisions of the current national standard GB 18582 "Limits of Harmful Substances in Wall Paints for Buildings", which is friendly to the environment and human body and meets environmental protection requirements. At the same time, it is a liquid state that is basically the same as ordinary interior and exterior wall paints, and can be directly used for construction without the need for on-site water addition and mixing, so it will not affect the construction personnel and the surrounding environment.

[0046] (4) Easy construction: The construction method of the intumescent steel structure fire retardant coating is simple and convenient. It can be sprayed, rolled or brushed without causing damage to the steel structure.

[0047] It has the following beneficial effects in fire safety protection of buildings:

[0048] (1) Improve the fire resistance level of buildings: Expandable steel structure fire retardant coating can effectively prevent and delay the development of fire. It can provide a higher flame retardant level for buildings. It can improve the fire resistance of buildings and reduce the loss of life and property caused by fire.

[0049] (2) Protect steel structures from deformation and melting: Steel structures are important components in buildings. Once a fire occurs, they are generally prone to deformation and melting, which seriously damages the structural safety of the building. However, intumescent steel structure fire retardant coatings can expand rapidly in the event of a fire to form a thick foam protective layer. This protective layer has a good heat insulation effect and can effectively protect the steel structure from being corroded by high temperatures, thereby ensuring that the steel structure does not deform or melt.

[0050] (3) Increase the bearing capacity of steel structures: Expandable steel structure fire retardant coatings can adhere to the surface of steel structures to form a solid flame-retardant protective layer, which can effectively reduce the corrosion of steel structures caused by high temperatures generated by fire, thereby increasing the bearing capacity of steel structures.

[0051] (4) Inhibit the generation of smoke and toxic gases: Expandable steel structure fire retardant coatings can inhibit the generation of smoke and toxic gases, reduce the pollution of fire to the indoor environment, and thus protect people's lives and safety.

[0052] The intumescent steel structure fireproof coating of the present invention plays an important role in the fire safety of buildings. Its application can not only protect the safety of buildings, but also prevent the spread of fire and reduce the loss caused by fire. When encountering fire, the coating will undergo a chemical reaction and expand rapidly. The foaming thickness is high, the carbon layer is dense and strong, and the heat insulation effect is good. The thickness reaches 30-100 times the original thickness, thereby effectively preventing the flame from burning the steel structure, so that the steel structure is well protected, and the bearing capacity (structural safety) time of the steel structure is extended, which wins precious time for escape and fire fighting and rescue. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 This is a cross-sectional view of a portion of the foamed indoor expandable steel structure aerogel fire retardant coating prepared in Example 1 of the present invention after a combustion experiment. DETAILED DESCRIPTION

[0054] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0055] Example 1

[0056] This embodiment provides an indoor expanded steel structure aerogel fire retardant coating

[0057] 10 parts of white pigment, 12.5 parts of dipentaerythritol, 0.5 parts of expanded graphite, 18 parts of Clariant's DM230 emulsion, 0.2 parts of hydroxyethyl cellulose, 0.5 parts of fungicide, 0.2 parts of 2-amino-2-methyl-1-propanol, 0.3 parts of SN-NXZ, 0.75 parts of Gaotai P90, 0.75 parts of ZrO2 aerogel, 17.5 parts of melamine, 19.5 parts of modified ammonium polyphosphate EPFR-APP262, 0.4 parts of the combination of BD-109 and NS-2125, 27.5 parts of water, wherein the mass ratio of BD-109 to NS-2125 is 1:1. The above components are evenly mixed to obtain an indoor expanded steel structure aerogel fire retardant coating, such as Figure 1The carbon layer expands rapidly during combustion, reaching 35 times the original height in about 1 to 2 minutes. Moreover, only the part in contact with the flame expands. The carbon layer has excellent heat insulation effect, which can greatly extend the bearing capacity (structural safety) time of the steel structure.

[0058] Example 2

[0059] This embodiment provides an indoor expanded steel structure aerogel fire retardant coating

[0060] 10 parts of white pigment, 8 parts of dipentaerythritol, 0.5 parts of expanded graphite, 18 parts of Clariant's DM230 emulsion, 0.2 parts of hydroxyethyl cellulose, 0.5 parts of fungicide, 0.2 parts of 2-amino-2-methyl-1-propanol, 0.3 parts of SN-NXZ, 0.75 parts of Gaotai P90, 0.75 parts of ZrO2 aerogel, 17.5 parts of melamine, 19.5 parts of modified ammonium polyphosphate EPFR-APP262, 0.4 parts of the combination of BD-109 and NS-2125, and 27.5 parts of water, wherein the mass ratio of BD-109 to NS-2125 is 1:1. The above components are mixed evenly to obtain an indoor expanded steel structure aerogel fire retardant coating.

[0061] Example 3

[0062] This embodiment provides an indoor expanded steel structure aerogel fire retardant coating

[0063] 10 parts of white pigment, 15 parts of dipentaerythritol, 0.5 parts of expanded graphite, 18 parts of Clariant's DM230 emulsion, 0.2 parts of hydroxyethyl cellulose, 0.5 parts of fungicide, 0.2 parts of 2-amino-2-methyl-1-propanol, 0.3 parts of SN-NXZ, 0.75 parts of Gaotai P90, 0.75 parts of ZrO2 aerogel, 17.5 parts of melamine, 19.5 parts of modified ammonium polyphosphate EPFR-APP262, 0.4 parts of the combination of BD-109 and NS-2125, and 27.5 parts of water, wherein the mass ratio of BD-109 to NS-2125 is 1:1. The above components are evenly mixed to obtain an indoor expanded steel structure aerogel fire retardant coating.

[0064] Example 4

[0065] The only difference between this embodiment and embodiment 1 is that this embodiment does not include the combination of wetting agents BD-109 and NS-2125.

[0066] Example 5

[0067] The only difference between this embodiment and embodiment 1 is that this embodiment does not include the dehydrating agent modified ammonium polyphosphate EPFR-APP262.

[0068] Example 6

[0069] The only difference between this embodiment and embodiment 1 is that this embodiment does not include the foaming agent melamine.

[0070] Example 7

[0071] The only difference between this embodiment and embodiment 1 is that in this embodiment, the dehydrating agent modified ammonium polyphosphate EPFR-APP262 is replaced by ammonium polyphosphate from Shandong Polychemical.

[0072] Example 8

[0073] The only difference between this embodiment and embodiment 1 is that in this embodiment, ZrO2 aerogel is replaced by silicon aerogel.

[0074] Example 9

[0075] The only difference between this embodiment and embodiment 1 is that in this embodiment, dipentaerythritol is replaced by starch.

[0076] Example 10

[0077] The only difference between this embodiment and embodiment 1 is that in this embodiment, the weight portion of melamine is 10 parts.

[0078] Embodiment 11

[0079] The only difference between this embodiment and embodiment 1 is that the weight portion of melamine in this embodiment is 20 parts.

[0080] Example 12

[0081] The only difference between this embodiment and embodiment 1 is that the adhesive is replaced with EZ 3066 in this embodiment.

[0082] Comparative Example 1

[0083] The only difference between this comparative example and Example 1 is that this comparative example does not include aerogel material.

[0084] Comparative Example 2

[0085] The only difference between this comparative example and Example 1 is that this comparative example does not include the thickener hydroxyethyl cellulose.

[0086] Comparative Example 3

[0087] The only difference between this comparative example and Example 1 is that this comparative example does not include the reinforcing agent expanded graphite.

[0088] Comparative Example 4

[0089] The only difference between this comparative example and Example 1 is that this comparative example does not include the binder DM230 emulsion of Clariant.

[0090] Comparative Example 5

[0091] The only difference between this comparative example and Example 1 is that this comparative example does not include the dispersant Cotai P90.

[0092] Comparative Example 6

[0093] The only difference between this comparative example and Example 1 is that this comparative example does not include dipentaerythritol.

[0094] The samples provided in the above Examples 1-12 and Comparative Examples 1-6 were subjected to performance tests.

[0095] Test standard: GBT 14907-2018

[0096] Simple laboratory test method for foaming: take a 2mm steel plate, grind it, apply 1mm thick intumescent steel structure fire retardant coating, and after drying, burn the front with a hydrocarbon flamethrower, attach a temperature sensor to the back, record the back temperature, and observe the foaming situation after burning.

[0097] The experimental data obtained are shown in Table 1, Table 2 and Table 3 below:

[0098] Table 1

[0099]

[0100] Table 2

[0101]

[0102]

[0103] Table 3

[0104]

[0105] It can be seen from the data in the above table that the indoor expandable steel structure aerogel fire retardant coating provided by the present invention has a relatively good effect, especially the formula within the preferred range has the best effect. Once the composition and component ratio of the aerogel, wetting dispersant, carbonizing agent, foaming agent, dehydrating agent, etc. in the product change, the product will have different degrees of initial drying cracking of the paint film, poor foaming effect of the carbon layer, hollowing, cracking, whitening and poor adhesion to the substrate, as well as the back temperature data of the steel structure, that is, the heat insulation effect of the carbon layer to the flame temperature reaching the steel structure deteriorates.

[0106] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An indoor intumescent steel structure aerogel fire retardant coating, characterized in that: The indoor intumescent steel structure aerogel fire retardant coating consists of the following components by weight: 10 parts of white pigment, 12.5 parts of dipentaerythritol, 0.5 parts of expanded graphite, 18 parts of Clariant's DM230 emulsion, 0.2 parts of hydroxyethyl cellulose, 0.5 parts of fungicide, 0.2 parts of 2-amino-2-methyl-1-propanol, 0.3 parts of SN-NXZ, 0.75 parts of Gaotai P90, 0.75 parts of ZrO2 aerogel, 17.5 parts of melamine, 19.5 parts of modified ammonium polyphosphate EPFR-APP262, 0.4 parts of a combination of BD-109 and NS-2125, and 27.5 parts of water, wherein the mass ratio of BD-109 to NS-2125 is 1:

1.

2. According to the indoor intumescent steel structure aerogel fire retardant coating as described in claim 1, it is characterized in that: The fungicide is any one of chloromethylisothiazolinone, methylisothiazolinone, octylisothiazolinone or benzisothiazolinone, or a combination of at least two thereof.

3. Application of the indoor intumescent steel structure aerogel fire retardant coating according to claim 1 or 2 in indoor steel structure decoration.

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