Study on Fire Retardant Coating for Modified Starch-Based Carbon-Nitrogen-Sulfur-Silicon Ring Steel Structure
In this paper,starch was modified to prepare modified starch-based carbon-nitrogen-sulfur-silicon environmental protection steel structure fire retardant coating.The effect of modified starch addition on the performance of the coating was investigated,and the flame retardant mechanism was analyzed.The results show that the addition of modified starch can significantly enhance the bonding performance of the coating,and has no effect on the other basic properties,which meets the requirements of GB 14907-2018;the modified starch can significantly improve the foaming performance and fire resistance of the coating,the most suitable addition amount of modified starch is 2%-6%,the foaming thickness of the coating is more than 3.0 cm,and the temperature on the back of the coating is less than 183.6℃.The modified starch forms a molten sodium ether salt when heated,which has a good mass transfer and heat transfer effect,is conducive to the simultaneous gasification of gas source materials,and is consistent with the carbonization of carbon source.The modified starch begins to decompose at about 289.1℃.After the phase transition,the residual carbon content is about 36.5%.It mainly acts as a carbon source and a small part of the gas source in the coating,and can improve the film-forming performance of the coating and reduce the cost.The fire retardant coating has a good application prospect.
modified starchfire retardant coating for carbon-nitrogen-sulfur-silicon ring steel structurefoaming performancefire resistance
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