Preparation method for anti-corrosion and flameproof integrated coating for thick-type steel structure

Abstract

The invention discloses a preparation method for an anti-corrosion and flameproof integrated coating for a thick-type steel structure. The coating is characterized by: preparing an anti-corrosion primer for a fire resistant-type steel structure, wherein the primer is prepared through mixing a component A and silicate cement, wherein the component A comprises emulsions such as acrylic acid waterproof elastic emulsion and the like, aluminium silicate fiber, mica powder, an assistant agent and water; preparing a flameproof coating for a thick-type steel structure, wherein the coating is preparedthrough mixing a component C and the silicate cement, wherein the component C comprises emulsions such as styrene-acrylate emulsion and the like, the aluminium silicate fiber, fly ash floater, expanded perlite, an assistant agent and the water; carrying out steps of cleaning process, the anti-corrosion primer coating, burnishing, the flameproof coating coating and the like for the surface of the steel structure to obtain the anti-corrosion and flameproof integrated coating for the thick-type steel structure, wherein the integrated coating is a system comprising the emulsion, the cement and the aluminium silicate fiber. The prepared coating provided by the present invention has characteristics of low comprehensive cost, anti-corrosion and flameproof integrated coating, and is applicable for the corrosion prevention and the flame protection for load-bearing steel structure components of various buildings in the industries of spaceflight, petroleum, chemical engineering, electric power, metallurgy, national defense, textile and the like.

Description

technical field [0001] The invention belongs to an anti-corrosion and fire-proof coating and a method for preparing the anti-corrosion and fire-proof coating for a steel structure, and relates to a preparation method for an anti-corrosion and fire-proof integrated coating for a thick steel structure. It is especially suitable for preparing an emulsion-cement-aluminum silicate fiber system thick steel structure anticorrosion and fireproof coating. The coating prepared by the method integrates anti-corrosion and fire prevention, has excellent fire-resistant and heat-insulating properties, and has anti-corrosion and anti-rust functions. It has excellent weather resistance, water resistance, and corrosion resistance. The application of anti-corrosion and fire protection of various steel structures has a very broad application prospect. Background technique [0002] As the main form of modern architecture, steel structure is widely used because of its light weight, high strength...

AI Technical Summary

Problems solved by technology

At present, the anti-corrosion protection of steel structure surface is mainly solvent-based, and the solvent-based anti-corrosion coating mainly uses epoxy resin, polyurethane resin, chlorine-containing polymer, phenolic resin, etc. as the film-forming base material. The research on resin base materials mainly focuses on water-based silicon-containing, fluoropolymer, water-based epoxy resin and water-based polyurethane resin. Resins have poor heat resistance and are easy to soften at high temperatures; among them, resins with relatively high fire resistance, such as epoxy resin, will soften when the temperature reaches 180-200°C and undergo thermal oxidation decomposition. The main chain of the product will be broken, and the phenolic resin can only withstand the temperature of 250 ° C. Once it exceeds the temperature, it will soften and fall off. Generally, when a fire occurs, the heat from the fire site will be transmitted to the surface of the steel structure finish through the fireproof layer. The temperature can reach 400-500 ° C , the anti-corrosion coatings using these resins cannot withstand such a high temperature and soften, causing the fire-proof layer to fall off from the bonded interface between the fire-proof layer and the anti-corrosion layer, causing the fire to directly face the steel structure, causing fire protection failure, and seriously threatening people's life and property safety; (2) Solvent-based anti-corrosion coatings contain a large amount of organic solvents, most of which evaporate during construction and drying, which not only seriously pollutes the environment and endangers people's health, but also causes a great waste of resources; (3 ) The cost of resin is high; the cost price of epoxy resin, polyurethane resin, etc. is high, and the use is limited

[0005] In the prior art, there are few reports on anticorrosion and fireproof coatings for thick steel structures. The "non-intumescent steel structure fireproof and anticorrosion coating" provided by the publication number CN1948404A is composed of the following components by weight: base material 50-60, expansion Vermiculite 4~8, mica powder 8~12, hollow floating beads 6~10, expanded perlite 10~15, aluminum dihydrogen tripolyphosphate 8~14, SiO 2 Modified barium metaborate 6-9, water 105-115, this coating is a non-intumescent dual-function coating used for fire protection and anti-corrosion protection of steel structures, but the anti-corrosion and waterproof effects of this coating are poor, because a large number of The expanded vermiculite and hollow floating beads have many pores between the coating system, and moisture and air can easily enter and pass through the coating, causing hydrogen evolution corrosion and oxygen absorption corrosion of the steel structure, which cannot be effectively anti-corrosion and waterproof.

Since there are many problems in the anticorrosion and fireproofing of steel structures, the main problem is that the two cannot be taken into account. It is very difficult to prepare anticorrosion and fireproof coatings with superior anticorrosion and fireproof functions.

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