颜填料和膨胀防火助剂对无机膨胀型防火涂料性能的影响

Effect of Pigments and Intumescent Fire Retardants on the Performance of Inorganic Intumescent Fire Retardant Coatings

以硅酸钾溶液和苯丙乳液作为成膜剂,通过控制颜填料和膨胀防火助剂的添加量,以提高无机膨胀型防火涂料的理化性能和防火性能,且通过热重(TG-DTG)、X射线衍射(XRD)、红外光谱(FT-IR)分析涂层的防火机理。结果表明:制备无机膨胀型防火涂料的最佳工艺参数是以5%的滑石粉、4%的钛白粉和6%玻璃粉作为颜填料,膨胀防火助剂白云石、氢氧化铝和可膨胀石墨添加量分别为5%、20%、2%。涂层防火性能测试后质量损失仅36.87%,且形成了新的陶瓷相。涂层在耐火1 h后,其背板最高温度为286℃,灼烧后可膨胀9.2倍左右,极大地提升了硅酸钾无机膨胀型防火涂料的理化性能和防火性能。

Potassium silicate solution and styrene-acrylic emulsion were used as film-forming agents.The physicochemical and fireproof properties of the inorganic fire-retardant coatings were improved by controlling the amount of pigment fillers and fire retardants.And the coating fire protection mechanism was analyzed by TG-DTG,XRD and FT-IR.The results showed that the optimal process parameters for the preparation of potassium silicate inorganic fire-retardant coatings were 5%talc powder,4%titanium dioxide and 6%glass powder as pigment fillers,5%dolomite,20%aluminum hydroxide and 2%expandable graphite as fire retardants.The results of TG-DTG,XRD and FT-IR showed that the mass loss of coating was 36.87%before and after fire protection and a new ceramic phase was formed.After 1 h of fire resistance of the coating,the maximum temperature of the back plate was 286℃,and the coating could be expanded about 9.2 times after burning.The physicochemical and fireproof properties of potassium silicate inorganic fire-retardant coatings were greatly improved.