混醇焦磷酸酯与超支化含Si单体协同阻燃丙烯酸酯涂层性能研究

Investigation on Properties of Synergistic Flame Retardant Acrylate Coatings with Mixed Alcohol Pyrophosphate and Hyperbranched Si Containing Monomer

为了提高环氧丙烯酸酯(EA)涂层的阻燃和热稳定性,以丁醇、乙醇及五氧化二磷为原料制备了一种混醇焦磷酸酯(NEPP);同时由KH-570水解制备了超支化含硅单体(Sca Si);再由NEPP与Sca Si复配,制备了磷、硅阻燃体系(NEPSi),将其与EA光固化体系复配,制备了系列阻燃丙烯酸酯涂层。利用垂直燃烧测定仪、紫外-可见分光光度计、傅立叶变换红外光谱仪、极限氧指数测定仪、锥形量热计及力学测定仪等研究了涂层的阻燃、热降解、透明性及力学性能等。结果表明:磷、硅阻燃体系有效提高了丙烯酸酯涂层的阻燃效果,当NEPP与Sca Si分别占阻燃配方质量的30%和4%时,所制备的目标阻燃涂层残炭率、LOI及UL-94垂直燃烧级别均达到最高值,分别为49.56%、51、V-0;热释放速率峰值最低为130.8 k W/m^(2);硬度、透光率分别为2H、81.27%。磷、硅阻燃剂能显著协效阻燃环氧丙烯酸酯涂层,拓宽其应用范围。

For improving the flame retardancy and thermal stability of epoxy acrylate(EA)coatings,a mixed alcohol pyrophosphate(NEPP) was prepared from butanol,ethanol and phosphorus pentoxide;and hyperbranched silicon-containing active monomer(Sca Si),which was prepared by KH-570 hydrolysis. Then a phosphorus and silicon flame-retardant systems(NEPSi)were prepared by NEPP and ScaSi,which was used to blend with EA UV curing system to formulate the flame retardant acrylate coatings. The flame retardancy,thermal degradation,transparency and mechanical properties of coatings were studied by use of vertical combustion tester,UV-Vis spectrophotometer,FT-IR,limiting oxygen index(LOI)tester,cone calorimeter and mechanical tester. The results showed that the flame retardant effect of acrylate coatings was improved by the flame retardant system of phosphorus and silicon,and when NEPP and ScaSi accounted for 30% and 4% of the mass of the flame retardant formulation,the carbon yield,LOI and UL-94 vertical combustion grade of the flame retardant coatings reached the highest respectively,namely 49. 56%,51 and V-0,and its peak heat release rate of 130. 8 k W/m^(2) was the lowest,and its hardness and transmittance were 2 H and 81. 27% respectively. The phosphorus and silicon flame retardants could significantly and synergistically improve the flame retardancy of epoxy acrylate coatings,and broaden its application fields.