Water-based indoor intumescent fire-retardant coating for steel structure and preparation method thereof

Abstract

The invention discloses a water-based indoor intumescent fire-retardant coating for a steel structure. The coating comprises the following components in parts by weight: 22-23 parts of a water-based polyvinyl acetate emulsion, 24-26 parts of ammonium polyphosphate, 8-10 parts of pentaerythritol, 8-10 parts of melamine, 5-10 parts of polyvinyl acetate modified carbon nanotubes, 8-10 parts of titanium dioxide, 0.5-1 part of sepiolite, 1-2 parts of ceramic fibers, 1-2 parts of a coalescing agent, 1-2 parts of a wetting dispersant, 0.1-0.3 part of a mildew inhibitor, 0.1-0.3 part of a defoaming agent, 0.1-0.5 part of a pH regulator, 0.1-0.5 part of a thickener and 10-15 parts of water. According the invention, various technical indexes of the fireproof coating prepared according to the formula all reach the indexes specified in GB14907-2018 Fireproof Coatings for Steel Structures; and the fireproof coating has the advantages of being rapid in expansion, compact in carbon layer, high in medium-and-long-term heat insulation efficiency, excellent in water resistance, friendly to environment and the like.

Description

technical field [0001] The invention belongs to the technical field of fireproof coatings, and in particular relates to a water-based indoor expansion fireproof coating for steel structures and a preparation method thereof. Background technique [0002] Steel structures are widely used in the modern construction industry due to their light weight, high strength, large span, large space, good seismic performance, convenient hoisting and construction, and short construction time. As a non-combustible building material, under the high temperature of fire, its mechanical properties such as yield strength, tensile strength and elastic modulus will decrease with the increase of temperature. When the temperature rises to about 500°C, its mechanical strength will decrease. If it is reduced by 60%, bending deformation will occur, and the bearing capacity will be lost, resulting in the bending of steel columns and beams, and the collapse of the building. In order to prolong the beari...

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Problems solved by technology

[0004] At present, there are few water-based fireproof coating products on the market, and most of their performance cannot meet the requirements of the GB14907-2018 standard. There are series such as the expansion carbon layer is not dense, easy to fall off, the medium and long-term fireproof and heat insulation effect is poor, and the water resistance performance does not meet the requirements. defect

However, solvent-based fireproof coatings contain a large amount of volatile organic compounds, which do not meet the trend requirements of green environmental protection.

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