【摘要】 采用原位聚合法以聚氨酯(PU)为外壳包覆聚磷酸铵(APP),制备了PU-APP微胶囊,通过溶剂、用水量、催化剂及原料配比等单因素考察,确定包覆的最佳工艺条件:在常温下,以水作溶剂,自制催化剂大分子树脂X-L-Y的催化作用下,水与APP质量比为3:1,1,2-丙二醇与甲苯-2,4-二异氰酸酯(TDI)物质的量比为1:1,PU与APP质量比为1:6。通过红外光谱(FTIR)、粒径分布和热重(TG)等对PU-APP的性能进行研究,结果表明,PU-APP微胶囊包覆完全,耐水性显著提高,且与APP相比粒径分布更窄、燃烧后残炭量更高,成炭效果更好。更多还原

【Abstract】 PU-APP microcapsules were prepare by the situ polymerizationuse with ammonium polyphosphate coating by polyurethane. By the studying of solvent,water consumption,catalyst and raw material ratio,the optimum conditions of coating were determined: : in the presence of a catalyst called X-L-Y the water and APP weight ratio is 3: 1,1,2-propylene glycol and 2,4-diisocyanate( TDI) molar ratio is 1: 1,PU and APP weight ratio is 1: 6. The polyurethane-ammonium polyphosphate microcapsules were characterized by infrared spectroscopy,laser particle size instrument and thermogravimetry( TG). The results show that PU-APP were microencapsulated completely,water resistance significantly improved,and compared with APP,it has narrower particle size distribution,higher amounts of residual carbon after combustion.更多还原