卡拉胶包覆APP微球阻燃水性环氧树脂

以氯化钡提纯k-卡拉胶, 经过氧化氢降解, 通过反相乳液聚合的方式制备了一系列卡拉胶包覆聚磷酸铵(APP)阻燃微球(k-CM/APP); 将其加入到水性环氧树脂(EP)中, 制备了3种钢结构防火涂层EP2, EP3和EP4. 利用红外光谱(IR)、 扫描电子显微镜(SEM)及元素分析(EDS)对k-CM/APP的结构及形貌进行了表征. 利用极限氧指数(LOI)、 垂直燃烧(UL-94)、 背温测试法、 热重分析(TG)、 锥形量热(CONE)、 附着力测试、 IR和SEM等方法分析了涂层的阻燃、 隔热及力学性能. 结果表明, k-CM/APP(3/1)球形结构完整, 800 ℃时的残炭量高达59.5%. 与其它阻燃涂层体系相比, 添加了k-CM/APP(3/1)的EP3防火涂层的极限氧指数达到28.5%, UL-94达到了V-0级, 60 min防火涂层耐火温度为253 ℃. 相比于纯EP涂层, EP3涂层的热释放速率峰值降低了58.26%, 总热释放量降低了20.84%, 附着力达到8.74 MPa.

Inflame-retardant Water-borne Epoxy Resin of APP Microsphere with Carrageenan Cladding†

After k-carrageenan was purified by barium chloride and degraded by hydrogen oxidation, a series of k-carrageenan/ammonium polyphosphate(k-CM/APP) inflame-retardant microsphere was prepared using inverse emulsion polymerization method. Then k-CM/APP was added to water-borne epoxy resin to prepare EP2, EP3, EP4 steel structure fire retardant coating. The structure and morphology of k-CM/APP were represented by using infrared spectrograph(IR), scanning electron microscope(SEM), energy dispersive spectrometry(EDS). The limit oxygen index(LOI), vertical combustion(UL-94), back temperature test method, thermogravimetry(TG), cone calorimeter, adhesion tester, IR and SEM were used for analyzing the flame retardant property, heat-insulating property, thermal property and mechanical property. Research results showed that k-CM/APP spherical structure was complete, and the carbon residue at 800 ℃ reached 59.5%. Compared with other fire retardant coatings, the LOI of the EP3 fire retardant coating with added k-CM/APP(3/1) reached 28.5%, UL-94 reached the class V-0, and the fire-resistant temperature of 60 min fire retardant coating was 253 ℃. Compared with pure EP coating, the heat release rate peak of EP2 coating was decreased by 58.26% and the total heat release quantity was decreased by 20.84%, adhesion reached 8.74 MPa.