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为了解苯丙乳液基膨胀型阻燃涂料组分间的关系使其发挥最大作用,用热重分析法探究涂料的阻燃过程;通过受热炭层膨胀高度测试,结合组合法确定各组分的作用,并对基础配方进行优化。结果表明:涂料在受热时,磷酸氢二铵和季戊四醇在110~238℃通过脱氨和水,生成偏磷酸铵与季戊四醇及磷酸与季戊四醇的交联物,并形成炭层;在250~380℃,三聚氰胺分解出气体,使炭层发泡,形成多孔泡沫炭层,达到阻燃的目的;配方中季戊四醇(成炭剂)和磷酸氢二铵(催化剂)构成炭源,三聚氰胺是气源,苯丙乳液是黏结剂;优化后的配方即苯丙乳液:磷酸氢二铵:季戊四醇:三聚氰胺质量比为2.82∶11.04∶6.00∶3.06。
In order to understand the relationship between the components of styrene-acrylic emulsion intumescent flame-retardant coatings to play its maximum role, using thermo-gravimetric analysis to explore the flame retardant coating; through the expansion of the carbon layer height test, combined with combination of components to determine the Role, and optimize the basic formula. The results show that when the coating is heated, the diammonium phosphate and pentaerythritol are formed into the carbon layer by deammoniation and water at 110 ~ 238 ℃ to form the cross-linked product of ammonium metaphosphate, pentaerythritol and phosphoric acid with pentaerythritol, and the carbon layer is formed at 250 ~ 380 ℃ , The melamine decomposes the gas to foam the carbon layer to form a porous carbon foam layer, so as to achieve the purpose of flame retardancy; the pentaerythritol (char forming agent) and the diammonium hydrogen phosphate (catalyst) form the carbon source, the melamine gas source, the benzene Acrylic emulsion is a binder; the optimized formula is styrene-acrylic emulsion: diammonium phosphate: pentaerythritol: melamine mass ratio of 2.82: 11.04: 6: 1.00: 3.06.