Fireproof coating

Abstract

The invention provides a fireproof coating, and belongs to the field of fireproof building materials. The fireproof coating comprises the following components in percentage by weight: 40-60% of water-based resin emulsion, 5-20% of fireproof sepiolite fiber slurry, 10-30% of a coating additive and other fillers, and 10-30% of water. A preparation method of the slurry comprises the following steps: (1) preparing modified sepiolite fabric: mixing sepiolite with a mixed acid solution 1 of hydrochloric acid and phosphoric acid; (2) conducting alkali neutralization: mixing the sepiolite slurry subjected to acid activation with ammonia water; and (3) sequentially adding talcum powder, vegetable gelatin powder, polypropylene fibers, cellulose ether and a surfactant into the sepiolite slurry while stirring to obtain the fireproof sepiolite fiber slurry. The fireproof coating has good fireproof performance.

Description

technical field [0001] The invention relates to a fireproof coating, and specifically discloses a fireproof coating using modified sepiolite fiber slurry as a functional component. Background technique [0002] Intumescent fireproof coatings are mainly used for fireproofing steel structures. The development of economy and society has promoted the development of the construction industry. Large-scale buildings such as exhibition halls, terminal buildings, large shopping malls, stadiums, high-end hotels and industrial plants are increasing, and are moving towards Large and beautiful, the main load-bearing components are mostly steel structures. [0003] For this reason, the fire protection of steel structures has attracted more and more attention. Although steel is a non-combustible material, its fire resistance is far worse than that of masonry structures and reinforced concrete structures. As the temperature rises, the mechanical strength of steel will decrease. When the t...

AI Technical Summary

Problems solved by technology

However, the applicant has found that there are multiple problems in the coating or fireproof board slurry that has added a large amount of sepiolite fibers: (1) Compared with flame retardants such as expanded vermiculite, magnesium hydroxide, and antimony trioxide, its flame retardant performance It needs to be further improved; (2) During the drying and curing process of coating or fireproof board, the drying time is too long, which greatly reduces the production efficiency. This is because sepiolite has good water absorption and water retention, and the sepiolite after water absorption Form a water-blocking barrier to prevent the diffusion of water from the inside to the outside surface, causing the surface of the paint film and fireproof board to dry out, but the actual interior is not dry, that is, although the surface is fast, it takes a long time to dry; (3) in In the actual production process, when a large amount of sepiolite is added, the viscosity of the system will increase sharply, which will destroy the stability of the dispersion system, resulting in prolonged dispersion time, reduced production efficiency, and poor dispersion effect.

Taking fireproof coatings as an example, this is because sepiolite itself also has the function of a thickener. When it enters water, it will quickly absorb water and flocculate. The well-dispersed pigments and fillers are reunited, and the stability of the polymer micelles is reduced, and in severe cases, sedimentation will occur