Aqueous microencapsulated fireproof paint for ultrathin steel structure

Abstract

The invention discloses an aqueous microencapsulated fireproof paint for an ultrathin steel structure. The fireproof paint is prepared from an aluminum hypophosphite microcapsule, an ammonium polyphosphate microcapsule, pentaerythritol, melamine, hydroxyethyl cellulose, an antifoaming agent, a dispersant, aqueous styrene-acrylic emulsion with a core-shell structure, and water. The aluminum hypophosphite microcapsule is wrapped by modified urea melamine formaldehyde resin, the problems that aluminum hypophosphite is easily decomposed and the coating can be cracked easily are solved; the thermalstability of aluminum hypophosphite is improved, the water absorbing performance is reduced; the efficient synergetic effect between the ammonium polyphosphate microcapsule and the aluminum hypophosphite microcapsule is utilized to greatly improve the fireproof performance of the fireproof paint; the fuming amount of the fireproof paint is largely reduced, the problem that ammonium polyphosphateis easily hydrolyzed, migrated, and precipitated in a damp environment is solved; and the provided fireproof paint has the advantages of efficient fireproof performance, good smoke inhibiting performance, excellent film forming property, excellent waterproof performance, good weatherability, environmental friendliness, and simple preparation, and is suitable for popularization and application.

Description

technical field [0001] The invention belongs to the technical field of coatings, and in particular relates to a water-based microencapsulated ultra-thin fireproof coating for steel structures and a preparation method thereof. Background technique [0002] Ultra-thin steel structure fireproof coating is widely used in steel structure fireproof protection because of its thin coating thickness, convenient construction and good decoration. However, the intumescent fire protection system accounts for a very large proportion in ultra-thin fire retardant coatings, especially the acid source ammonium polyphosphate, ammonium polyphosphate, etc. have good water solubility, are easy to migrate when exposed to water, and have poor compatibility, resulting in poor adhesion of the coating. Good, poor durability; at the same time, when the ultra-thin steel structure fireproof coating is expanded and foamed by heat, it will generate a large amount of smoke, endangering people's life, health...

AI Technical Summary

Problems solved by technology

However, aluminum hypophosphite has poor compatibility and high water absorption, especially when added to the paint, it is easy to crack the paint, and it will slowly decompose into corrosive and spontaneously flammable phosphine gas when exposed to the air, and even under extreme conditions. formation of explosive mixtures

Therefore, it is necessary to coat and modify the surface of aluminum hypophosphite during application. For example, a method for preparing microencapsulated aluminum hypophosphite is provided in the patent CN201510410213.6, which uses aluminum hypophosphite as the capsule core and uses melamine / formaldehyde resin, melamine / formaldehyde / polyetheramine copolymer or melamine / formaldehyde / KH550 copolymer as the capsule material, the prepared aluminum hypophosphite microcapsules, the capsule material is difficult to cover the core material, the microencapsulation yield is very low, the cost is high, and it is not suitable Industrial production

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