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通过原位聚合法制备了聚乙烯醇(PVA)改性的三聚氰胺(MEL)-甲醛树脂(VMF)微胶囊,并对聚磷酸铵(APP)/介孔分子筛MCM-41进行了包覆,得到了一种核壳结构的微胶囊阻燃剂[MVMF-(A/M)]。采用IR、SEM对包覆前后的阻燃剂结构及形貌进行了表征。并将其加入到天然橡胶(NR)中,通过LOI、UL 94、TG和拉伸测试考察了NR复合材料的阻燃和力学性能。实验结果表明:MVMF-(A/M)在20℃水中的溶解度为0.3474 g,相比APP溶解度降低了41.7%,且MVMF-(A/M)粒子表面更粗糙;与其他阻燃天然橡胶体系相比,添加了MVMF-(A/M)的NR复合材料(NR3)的极限氧指数最高,达到30.1%,UL-94达到了V-0级,拉伸强度为8.84 MPa,断裂伸长率为310.20%。
Poly (vinyl alcohol) (PVA) -modified melamine (VM) microcapsules were prepared by in-situ polymerization and coated with APP / mesoporous molecular sieve MCM-41 to obtain A core-shell microcapsule flame retardant [MVMF- (A / M)] was prepared. The structure and morphology of flame retardant before and after coating were characterized by IR and SEM. The flame retardancy and mechanical properties of NR composites were investigated by LOI, UL 94, TG and tensile tests. The experimental results show that the solubility of MVMF- (A / M) in water at 20 ℃ is 0.3474 g, which is 41.7% lower than that of APP, and the surface of MVMF- (A / M) particles is rougher. Compared with other flame retardant natural rubber systems The ultimate oxygen index of NRM with MVMF- (A / M) added was the highest, reaching 30.1%, UL-94 reached V-0, tensile strength was 8.84 MPa, elongation at break 310.20%.