二羟基硅油改性水性聚氨酯树脂的合成及性能  

Synthesis and Properties of Waterborne Polyurethane Modified by Dihydrooxypolydimethylsiloxane

作　　者：吴小峰[1] 朱传方[1] 张丽[1] 万婷[1] 

机构地区：[1]华中师范大学化学学院,武汉430079

出　　处：《应用化学》2007年第9期1023-1026,共4页Chinese Journal of Applied Chemistry

基　　金：湖北省自然科学基金(2006ABA174)资助项目

摘　　要：以异佛尔酮二异氰酸酯(IPDI)、二羟基硅油(DHPDMS)、聚酯二元醇和二羟甲基丙酸(DMPA)为主要原料,合成了高固含量(38%)、挥发性有机化合物(VOC)为60g/L的DHPDMS改性水性聚氨酯树脂(SiPU-Ⅰ)。探讨了DHPDMS的质量分数(ω(DHPDMS))、DHPDMS的分子量(Mn)对DHPDMS改性聚氨酯树脂的外观、粘度(η)、附着力、吸水率(Sw)、硬度、拉伸强度(σ)、断裂伸长率(ε)等性能的影响。结果表明,DHPDMS质量分数为2%、分子量为3000时改性树脂的各项性能较优异,附着力为1级,机械性能较好(σ=14.48MPa,ε=521%)。红外光谱分析表明,硅氧键确实引入到聚合物中且聚合物中存在大量氢键;DSC测试表明,聚合物有2个玻璃化转变温度(Tg1=-28.1℃,Tg2=34.4℃),存在微相分离。Waterborne polyurethane（WPU） dispersion with a high solid content of about 38% and a volatile oganic compound content of about 60 g/L was prepared from isophorone diisocyanate （IPDI）, dihydrooxypolydimethylsiloxane（DHPDMS）, polyester-diol, dimethyloxypropionic acid （DMPA）. Effects of the amount of DHPDMS, the molecular mass of DHPDMS on the appearance, viscosity, adhesion, water resistance, hardness, tensile strength, elongation of polyurethane modified by DHPDMS were discussed. IR spectrum indicates the silica-oxygen bond is introduced to the polymer and lots of hydrogen bonds are present in the polymer; DSC demonstrates two glass transition temperatures（ Tg1= -28. 1 ℃, Tg2 =34.4 ℃ ） and microphase separation is present; SEM has verified the above results. The polymer was also compared with the non-modified polyurethane. The result shows that the modified resin has good performance （good mechanical properities, σ = 14.48 MPa, ε = 521% ） when the amount of DHPDMS is 2% and molecular mass is 3 000.

关 键 词：二羟基硅油 水性聚氨酯 合成 改性 

分 类 号：O631.2[理学—高分子化学]