机构地区: 中国林业科学研究院林产化学工业研究所国家林业局林产化学工程重点开放性实验室
出 处: 《林产化学与工业》 2009年第B10期39-42,共4页
摘 要: 以聚醚(N210)、甲苯二异氰酸酯(TDI)、一缩二乙二醇(DEG)及蓖麻油(C.O.)为主要原料,二羟甲基丙酸(DMPA)为亲水扩链剂,三乙胺为中和剂制备了稳定的阴离子水性聚氨酯乳液(WPU),研究了NCO/OH(物质的量之比,下同)、DMPA用量及蓖麻油加入量对WPU的耐水性、稳定性及力学性能的影响。研究结果表明:改性后的乳液具有较好的稳定性,适量的蓖麻油可提高胶膜的拉伸强度及耐水性;当蓖麻油聚醚质量比为3∶7、DMPA用量为5%、NCO/OH值为1.3时,WPU综合性能最好。 The stable waterborne polyurethane( WPU ) was prepared using toluene diisocyanate ( TDI ), polyether polyol ( N210 ) and dimethylolpropionie acid(DMPA) as main raw materials and castor oil( C. O. ) as crosslinking agent. The effects of NCO/OH molar ratio, doses of DMPA and C.O. on water-resistance, stability and mechanical properties of the waterborne polyurethane were studied. The results showed that modified WPU possessed good stability. Suitable amount of C. O. improved tensile strength and water-resistance of the film. The comprehensive property of WPU was excellent when mass ratio of C. O./polyether was 3 : 7, DMPA mass fraction was 5 %, NCO/OH ratio was 1.3.