Novel inorganic intumescent steel structure fireproof coating and preparation method thereof

Abstract

The invention discloses a novel inorganic intumescent steel structure fireproof coating and a preparation method thereof, and belongs to the field of fireproof coatings, and the novel inorganic intumescent steel structure fireproof coating is characterized in that the fireproof coating mainly comprises the following raw materials in parts by dry weight: 5 to 6 parts of solid sodium silicate, 25 to44 parts of liquid sodium silicate, 20-40 parts of aluminum hydroxide, 3-10 parts of low-melting-point glass powder, 5-20 parts of magnesium oxide, 0-10 parts of redispersible latex powder, 0.1-5 parts of a waterproof agent, 0.1-1 part of a defoaming agent and 0-20 parts of water. Compared with the prior art, the method has the advantages of high expansion layer strength, small smoke amount, good film forming and fireproof performance, low cost, simple preparation process, convenient operation and the like.

Description

technical field [0001] The invention relates to a fireproof coating, in particular to a novel inorganic expansion steel structure fireproof coating and a preparation method thereof, belonging to the field of fireproof coatings. Background technique [0002] Steel structures are widely used in the field of construction due to their high strength, good toughness, good earthquake resistance, and good extensibility. The steel structure is a good conductor of heat, and the relationship between its bearing capacity and temperature shows that the bearing capacity will decrease rapidly with the increase of temperature, resulting in poor fire resistance. Experiments have proved that when the temperature of the steel structure reaches about 550°C, the steel structure will lose most of its bearing capacity. When a fire breaks out, the temperature of the fire site can reach about 1000°C. At this temperature, the building collapses due to the loss of bearing capacity of the steel struct...

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Problems solved by technology

However, at present, ultra-thin steel structure fire retardant coatings are mostly organic models, which pollute the environment during production and construction, release a large amount of toxic smoke during flame retardancy, and endanger human health; in addition, there are high prices, weather resistance and aging resistance. Poor and other deficiencies, do not meet the future development trend of green environmental protection materials

[0005] In the Chinese patent CN 105885488A, a preparation method of a new type of inorganic ultra-thin expanded steel structure fireproof coating is disclosed. Liquid sodium silicate, expanded graphite, low melting point glass powder, magnesium hydroxide, latex powder and water are weighed according to the formula, and mixed After uniformity, add it to the mixer and stir to make the coating evenly dispersed, and put it in a tank for later use. In this patent, liquid sodium silicate is used alone as a binder. Experiments have proved that when liquid sodium silicate is used alone, the liquid silicic acid has a lower modulus. The curing time of sodium is too long, and the water resistance is too poor. With the increase of the modulus, the curing time of liquid sodium silicate becomes shorter, and the water resistance is enhanced, but the expansion is poor, and there are wrinkles after the coating is formed, and it burns. Over time, cracks are prone to occur, and the fire resistance performance cannot meet the requirements; in addition, the large amount of magnesium hydroxide used in this patent will cause cracks in the coating, and the coating has poor expansion, which reduces the fire protection performance

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