目的：制备一种新型磷氮类紫外光固化膨胀阻燃涂层，研究磷氮复合成分对阻燃性能及膨胀行为的影响。方法采用丙烯酸正丁酯、甲基丙烯酸甲酯、甲基丙烯酸缩水甘油酯为原料制备环氧侧基聚丙烯酸酯，进一步利用丙烯酸开环环氧制备光固化聚丙烯酸酯，并结合前期所合成的含磷单体磷杂环丙烯酸酯磷酸酯( PGMH)和含氮光固化单体三嗪基四丙烯酸酯( BDAETH)制备光固化膨胀阻燃涂层。通过热重法和红外光谱研究了PGMH对光固化聚丙烯酸酯固化膜热降解机理的影响。采用极限氧指数对涂层阻燃性能进行研究，设计并自制设备对涂层的膨胀行为进行监测。结果随着磷氮复合阻燃剂的添加，涂层在450~480℃之间快速膨胀，其最大单向膨胀度可达14。膨胀碳层隔绝氧气，从而提升阻燃性能，将光固化聚丙烯酸酯的氧指数从19提升到28.5。结论磷氮复合阻燃剂的添加可有效赋予涂层在升温或燃烧过程中的膨胀特性，生成隔绝氧气的膨胀碳层，提高涂层的阻燃性能。
ABSTRACT:Objective To prepare a new UV curable intumescent flame retardant coating, and investigate the influences of the phosphorus-nitrogen-containing flame retardant on the flame retardant property and expansion process of polyacrylate. Methods UV curable polyacrylate was synthesized using butyl acrylate, methyl methacrylate and glycidyl methacrylate, which were blended in different ratios with 2,2-dimethyl-1,3-propanediol glycerol-methacrylate phosphate (PGMH) and N,N'-Bis(2,4-di(acryloyloxy-ethyl)-[1,3,5]-triazin-2-yl)-hexane-1,6-diamine ( BDAETH) to prepare UV curable intumescent flame retardant coatings. The influence of PGMH on the thermal degradation mechanism of UV curable polyacrylate was studied by thermal gravimetric analysis and Fourier transform infrared spectroscopy. The flame retardant properties and the expansion process of the intumescent flame re-tardant coatings were further monitored by limiting oxygen indexes and self-made equipment. Results The addition of phosphorus-nitrogen-containing flame retardant could greatly improve the coating to expand in the temperature range of 450~480 ℃ and the maximum unidirectional expansion degree reached 14. The expansion coating could isolate oxygen and thus improve the coating's limiting oxygen index from 19 to 28. 5. Conclusion The addition of phosphorus-nitrogen-containing flame retardant enabled polyac-rylate to expand during increasing temperature or combustion and to form expansion char to isolate oxygen. As a result, the flame retardant properties were improved.
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