Smoke-suppression and waterproof aqueous ultra-thin steel structure fireproof coating and preparation method thereof

Abstract

The invention discloses a smoke-suppression and waterproof aqueous ultra-thin steel structure fireproof coating and a preparation method thereof. The fireproof coating comprises the following components in parts by weight: 180-300 parts of vinegar emulsion, 190-330 parts of high-performance ammonium polyphosphate, 60-110 parts of pentaerythritol, 50-100 parts of melamine, 50-110 parts of titaniumdioxide, 5-10 parts of water-based graphene pulp, 10-20 parts of inorganic reinforcing filler, 5-20 parts of a film-forming agent, 3-6 parts of a wetting and dispersing agent, 1-3 parts of a preservative, 1-3 parts of an antifoaming agent, 1-3 parts of a pH stabilizer, 2-6 parts of a thickener and 110-260 parts of deionized water. The invention also comprises the preparation method of the coating;the fireproof coating is strong in water resistance, compact in carbon layer, good in adhesion, good in fireproof and heat insulation effect, environment-friendly and non-toxic; and the preparation method is simple.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to a smoke-suppressing and water-resistant water-based ultra-thin fireproof coating for steel structures and a preparation method thereof. Background technique [0002] Steel structure buildings have the advantages of light weight, fast construction, high strength, and flexible layout, and are widely used in various single-storey factory buildings and commercial high-rise buildings. However, steel has strong thermal conductivity and poor fire resistance, and its mechanical properties such as yield point, tensile strength and elastic modulus will drop sharply due to the increase of temperature. Usually at a temperature of 450-650°C, the load-bearing capacity will be lost, and deformation will cause the steel structure to lose its support and collapse. Generally, the fire resistance limit of unprotected steel structures is about 15 minutes, and the fire resistance limit can be exten...

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Problems solved by technology

[0004] However, the current ultra-thin fireproof coatings for steel structures generally have the following defects: (1) The smoke is highly toxic and emits a large amount of toxic and irritating gases in case of fire. According to statistics, about 85% of the deaths in fires are due to toxic smoke. Most of them were suffocated to death by inhaling smoke and toxic gases, not burned to death by open flames.

(2) Poor water resistance, which cannot meet the 24-hour water resistance time required by the national standard, and steel structure coating is usually done outdoors. Once it rains or the humidity is too high, it is easy to cause the fireproof coating to blister and fall off, causing Fireproof coating fails, causing quality hazards

(3) The fire resistance is poor, the charcoal layer produced after fire expansion is poor in strength, the charcoal layer is loose and hollow, the heat insulation and fire prevention effect is poor, and the adhesion to the base material is poor, and it is easily broken by the flame. The base material falls off, thus losing the fireproof effect, and making the fire site filled with a large amount of carbonaceous dust

However, there are still the following defects: (1) The smoke suppression performance is not good; (2) During the preparation, the components tert-acetic emulsion and ammonium polyphosphate need to be modified, and the steps are cumbersome and time-consuming, which reduces the production efficiency; ( 3) Although the addition of filler sericite and talc is beneficial to improve crack resistance and water resistance, these two fillers inhibit the foaming of the coating and affect the density of the carbon layer, which will reduce the fire resistance; (4) The selected pentaerythritol After the slurry is prepared by sand grinding, the fineness is still 110-130 μm, which affects the coating performance; (5) Although the water resistance reaches 48 hours, which meets the requirements of the national standard, it is still not ideal, resulting in poor construction performance

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