聚酯型水性聚氨酯胶膜结晶性与耐热性的关系  

Relationship Between Crystallinity and Thermostability of Cast Films of Polyester-Based Waterborne Polyurethane

作　　者：夏正斌[1] 曹高华[1] 张燕红[1] 雷亮[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：《华南理工大学学报（自然科学版）》2014年第7期117-123,137,共8页Journal of South China University of Technology(Natural Science Edition)

基　　金：省部企业科技特派员行动计划合作项目(TPY2010031549660)

摘　　要：以聚己二酸1,4-丁二醇酯、1,4-丁二醇、六亚甲基二异氰酸酯、异佛尔酮二异氰酸酯、N-(2-氨基乙基)-氨基乙烷磺酸钠、二羟甲基丙酸和乙二胺为主要原料,通过丙酮法合成了不同软段相对分子质量、硬段含量、硬段种类、亲水扩链剂及以液体石蜡共混改性5个系列的水性聚氨酯(WPU)乳液.采用FT-IR表征了WPU的结构和氢键化程度,采用DSC和TG表征了各系列WPU胶膜的结晶性和耐热性.结果表明,硬段含量较高、硬段较规整及添加了液体石蜡的WPU的氢键化程度较高;以较高相对分子质量的聚酯多元醇作为软段、分子结构规整的二异氰酸酯作为硬段、氨基磺酸盐作为亲水扩链剂及以液体石蜡改性所制备的WPU的结晶性较好;WPU胶膜结晶性的改善有助于提高其耐热性能.Five series of waterborne polyurethane emulsions , respectively with different relative molecular masses of soft segments , different kinds of hard segment , different hard segment contents , different hydrophilic chain exten-ders as well as with blending modification by liquid paraffin were synthesized via the actone method with poly -1, 4-butylene adipate glycol , 1,4-butanediol , hexamethylene diisocyanate , isophorone diisocyanate , N-（2-aminoethyl ）-amino ethane sulphonated sodium , dimethylol propionic acid and ethylenediamine as the main raw materials .Then, the structure and hydrogen bonding of WPU were characterized by means of FT-IR, and the crystallinity and ther-mostability of WPU films were determined respectively through DSC and TG .The results indicate that （ 1 ） higher contents and more-defined structure of hard segment as well as the addition of liquid paraffin can increase hydrogen bonding degree of WPU;（2） with polyester polyol of higher relative molecular mass as the soft segment , diisocya-nate of regular structure as the hard segment , sulphamate as the hydrophilic chain extender and liquid paraffin as the modifier, WPU films show higher crystallinity; and （3）higher crystallinity of WPU films helps improve their thermostability .

关 键 词：水性聚氨酯 结晶性 耐热性 微相分离 

分 类 号：TQ323.8[化学工程—合成树脂塑料工业] TQ430.1