Waterborne waterproof expansion-type fire-resistive coating for steel structures and preparation method of coating

Abstract

The invention discloses a waterborne waterproof expansion-type fire-resistive coating for steel structures and a preparation method of the coating. The coating is prepared from, by mass, 30-40 parts of waterborne silicone acrylic emulsion, 20-30 parts of melamine-coated ammonium polyphosphate, 5-10 parts of dipentaerythritol, 10-20 parts of melamine, 2-5 parts of expanded perlite, 1-5 parts of a film forming auxiliary, 0.5-1 part of a wetting dispersant, 0.1-0.5 part of a mildew preventive, 0.1-0.5 part of a defoaming agent, 0.1-1 part of a flash rust inhibitor, 0.1-0.5 part of a pH regulating agent, 0.1-0.5 part of a thickening agent and 10-20 parts of water. According to the waterborne waterproof expansion-type fire-resistive coating for the steel structures and the preparation method of the coating, the preparation process is simple, and the coating can be obtained only by adding the materials in proportion in batches and then mixing the materials to be uniform; the comprehensive performance of the fire-resistive coating accords with the national standard GB14907-2002 'general specifications of fire-resistive coating for steel structure', and the fire-resistive coating has the advantages of being high in expansion speed and carbon layer strength, good in medium-long-term fireproof and heat insulation effect, high in waterproofness, safe, environmentally friendly and the like.

Description

technical field [0001] The invention relates to a water-based water-swellable steel structure fireproof coating and a preparation method thereof, belonging to the technical field of fireproof coatings. Background technique [0002] Compared with concrete, steel structure has obvious advantages in material properties, economic benefits, and environmental protection. It is widely used in long-span structures, super high-rise buildings, ordinary residences and office buildings, etc., and is gradually becoming the mainstream material of construction. However, the poor fire performance of steel structures restricts its development to a large extent. Theoretically, the critical temperature at which the steel structure cannot maintain static equilibrium under full load is 528°C. Once a fire breaks out in a building, the temperature of the fire site can reach more than 700°C within 10 minutes, and the exposed steel structure will reach the critical temperature within 10 minutes of ...

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Problems solved by technology

[0003] At present, most of the fire-resistant coatings for steel structures promoted on the market are solvent-based, and water-based fire-resistant coatings are rare and expensive

Solvent-based fireproof coatings contain a large amount of organic volatiles, which not only pollute the environment, waste energy, and seriously endanger the health of construction workers, but also the residual organic solvents after the coating film is formed may reduce the fireproof effect

The raw materials used in existing fire-resistant coating products, such as the classic ammonium polyphosphate / pentaerythritol / melamine intumescent flame-retardant system, have great water solubility and are easy to precipitate out of the coating, resulting in a significant decline in fire-proof performance, and are only suitable for short-term fire protection insulation

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