Development And Application Of Waterborne Thin Steel Structure Coatings Which Can Realize Integration Of Anti-corrosion With Fire Prevention

This article developed a water-based,thin-walled fireproof and anti-corrosive coating for steel structures.Incorporating kaolin,sodium-based fluxes,and starch-modified high-molecular materials improved the fire-resistant stability of organic foam layers through organic-inorganic compounding,and fire-retardant paint formulation and production process technology were studied,then aluminum silicate fiber was used to improve the fireproof performance of the anti-corrosion primer.The results were as follows: In fireproof topcoats,the optimal ratio of APP/PER/MEL flame retardant was 24:8:16.The optimal ratio of inorganic filler titanium dioxide was 5%.The optimal ratio kaolin and OAS was 3%and 3.5% respectively.The starch modified polymer material can replace part of the emulsion.the optimal amount of starch modified polymer material and emulsion was 11% and 9% respectively.When the coating thickness was 2.0mm,the fire resistance was the best.Anti-corrosion and fire-retardant primers were prepared for fire-resistant topcoats,self-preserved anti-corrosion primers and aluminum silicate fibers,when the ratio of fireproof topcoat,anti-corrosive primer and fireproof material was 20:20:1,the anti-corrosion and fireproof effect was the best.The mechanism analysis was as follows: Because the particle size of kaolin was ultra-fine,kaolin can be evenly distributed in the entire coating,which was conducive to blend and compound the carbonized layer and the inorganic stabilizing material,promoted the uniform foaming of foaming layer,and improved the compactness of the carbonized layer.OAS was a kind of material with low melting point,which can appear liquid phase at 340 ℃,delay the overflow of ammonia and other gases and the loss of phosphoric acid,improve the foaming effect of carbonized layer,and accelerate theformation of titanium phosphate and titanium pyrophosphate.It was conducive to blend and compound the carbonized layer and the inorganic stabilizing material.The starch polymer modifier had good foaming and char formation properties,in the fire resistance test,which can cooperate with the foaming of organic foam layer and increase the expansion thickness of the carbonized layer.The anti-corrosion and anti-corrosion coating was tested and its physical and chemical properties were in compliance with the requirements.the surface of the coating had not changed significantly after the corrosion test.When the thickness of the coating was 1.0 mm,the fire endurance can reach the fire resistance requirement of 1 h.When the coating thickness was 2.0 mm,the fire endurance was above 100 min.Therefore,the coating had excellent anti-corrosion and fire-resistant properties,can realize anti-corrosion and fire prevention integration,and had a broad application prospects.