室温自交联水性聚氨酯分散体的合成与表征  

Synthesis and Characterization of Self-Crossllnkable Water-borne Polyurethane Dispersion

作　　者：陈广祥[1] 李金玲[1] 叶代勇[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：《材料保护》2010年第1期5-8,12,共5页Materials Protection

摘　　要：采取新工艺以甲苯二异氰酸酯(TDI-80)、聚醚二元醇(N220)、三羟甲基丙烷(TMP)、二羟甲基丙酸(DMPA)、环氧树脂(E-20)、甲基丙烯酸甲酯(MMA)等原料合成了聚氨酯-丙烯酸酯复合分散体(PUA-1),通过双丙酮丙烯酰胺(DAAM)引入酮羰基和己二酸二酰肼(ADH)引入肼基,合成了室温自交联复合分散体(PUA-2)。探讨了DMPA,MMA,DAAM和ADH的加入量对分散体和涂膜性能的影响。通过傅立叶红外光谱(FTIR)、示差扫描量热仪(DSC)、接触角测量仪对PUA-1及PUA-2进行了表征。结果表明,当DMPA,MMA,DAAM的含量[占聚氨酯(PU)的质量分数]分别为6%,25%,2.5%及ADH与DAAM的摩尔比为1时,分散体和涂膜的综合性能较好;酮肼间发生了交联反应,交联使得胶膜的耐水性和力学性能得到了提高。Waterborne polyurethane-acrylic hybrid dispersion PUA-1 was synthesized by using toluene diisocyanate (TDI),polyether binary alcohol (N220),dimethylolpropionic acid (DMPA),epoxy resin (E-20) and methyl methacrylate (MMA) as the starting materials.Then composite dispersion PUA-2 which was self-crosslinkable at ambient temperature was obtained by adding diacetone acrylamide (DAAM) and adipic di-hydrazide (ADH).The effects of the dosage of DMPA,MMA,DAAM and ADH on the properties of the emulsions of PUA-1 and PUA-2 and their films were investigated.At the same time,the chemical structure,thermal stability and water contact angle of the films of PUA-1 and PUA-2 were measured by using a Fourier transformation infrared spectrometer,a differential scanning calo-rimeter and a water contact angle meter.Results show that the PUA hydride dispersion prepared at ADH/DAAM molar ratio of 1 and DMPA,MMA,DAAM dosage of 6.0%,25.0%,2.5% re-spectively has better comprehensive properties.Crosslinking reac-tion had taken place between DAAM and ADH,which contribu-ted to improved resistance to water and mechanical properties of the film of self-crosslinkable PUA-2.

关 键 词：水性聚氨酯 自交联复合分散体 聚氨酯-丙烯酸酯 双丙酮丙烯酰胺 己二酸二酰肼 

分 类 号：TQ630.1[化学工程—精细化工]