软硬段比对磺酸盐型水性聚氨酯性能的影响  

Influences of soft/hard chain segment ratio on properties of sulfonated waterborne polyurethane

作　　者：宁蕾[1] 夏正斌[1] 王莹莹[1] 沈慧芳[1] 

机构地区：[1]华南理工大学化学与化工学院,广东广州510640

出　　处：《中国胶粘剂》2010年第9期18-22,共5页China Adhesives

摘　　要：以聚己二酸乙二醇酯二醇(PBA)、异佛尔酮二异氰酸酯(IPDI)和六亚甲基二异氰酸酯(HDI)为主要原料,以乙二胺基乙磺酸钠为亲水性扩链剂,合成了固含量为50%的磺酸盐型水性聚氨酯(WPU)乳液。考察了软硬段比对乳液黏度、粒径及其分布、聚合物重均相对分子质量(Mw)、胶膜结晶性以及力学性能等影响。结果表明:当软硬段比值为2.96时,可以制得固含量为50%的磺酸盐型WPU乳液,其平均粒径为146.0 nm、黏度为143 mPa.s,聚合物Mw为128 488,结晶熔融温度为50℃,结晶性相对最好;此时WPU胶膜的拉伸强度(31.6 MPa)和断裂伸长率(1 702%)相对较大;WPU胶粘剂的初始剥离强度(118.6 N/cm)和最终剥离强度(156.3 N/cm)相对最高。With polyethylene glycol adipate diol（PBA）,isophorone diisocyanate（IPDI） and hexamethylene diisocyanate（HDI） as main raw materials,N-（2-aminoethyl）-aminoethane sulfonate sodium as hydrophilic chain extender,so a sulfonated WPU（waterborne polyurethane） emulsion with 50% solid content was prepared.The influences of soft/hard chain segment ratio were investigated on emulsion viscosity,particle size and distribution,polymer average molecular weight（Mw）,film crystallizability and mechanics properties.The results showed that the sulfonated WPU emulsion with 50% solid content could be prepared when the mass ratio of m（soft chain segment）∶m（hard chain segment） was 2.96∶1,here its average diameter was 146.0 nm,viscosity was 143 mPa.s,the Mw of polymer was 128 488,melting temperature with relatively best crystallizability was 50 ℃,otherwise the tensile strength（31.6 MPa） and elongation at break（1 702%） of WPU film were relatively biggish,the initial peeling strength（118.6 N/cm） and final peeling strength（156.3 N/cm） of WPU adhesive were relatively highest.

关 键 词：磺酸盐 水性聚氨酯 亲水性扩链剂 软硬段比 

分 类 号：TQ323.8[化学工程—合成树脂塑料工业]