文献类型：期刊文献

中文题名：水性聚氨酯甲阶酚醛水分散液微观形态及杂化膜的性能

英文题名：MORPHOLOGY OF WATERBORNE POLYURETHANE/PHENOLIC RESIN DISPERSION AND THE PROPERTIES OF ITS HYBRID FILM WITH SiO_2

作者：胡治国[1];袁荞龙[1];王得宁[1]

机构：[1]华东理工大学材料科学与工程学院,上海200237

年份：2003

卷号：13

期号：2

起止页码：195

中文期刊名：高分子学报

外文期刊名：Acta Polymerica Sinica

收录：CSTPCD;;Scopus;北大核心:【北大核心2000】；CSCD:【CSCD2011_2012】；

基金：国家自然科学基金资助项目 (基金号 5 0 0 73 0 0 5 )

语种：中文

中文关键词：水性聚氨酯;甲阶酚醛;水分散液;微观形态;杂化膜;性能;水性涂料

外文关键词：waterbome polyurethane; phenolic resin; waterborne coating; hybrid material

摘要：以自乳化型聚氨酯和甲阶酚醛制备了聚氨酯 酚醛复合水分散液 .pH值与酚醛溶解度的关系表明甲阶酚醛的溶解是酚羟基电离的结果 .聚氨酯 甲阶酚醛水分散液粒子的形态有核壳结构、不完善的核壳结构及纯聚氨酯颗粒三种 ,后者粒径最小 .随着酚醛用量的增大 ,粒子平均粒径增大 .酚醛含量增加使体系热稳定性、机械稳定性、冻融稳定性及临界聚沉值下降 ,pH值稳定范围变窄 .分散液稳定性和电性能考察证明 ,本复合分散液的稳定性主要由分散液的电性能所决定 ,属真溶胶 ,但在一定程度上也具有大分子溶液的特性 .复合液涂膜的性能较纯聚氨酯有所改善 。
A waterborne polyurethane/A-stage phenolic resin dispersion was prepared. The relationship between pH value and the solubility of the phenolic resin in water indicated that the dissolution of A-stage phenolic resin resulted from the ionization of the phenolical hydroxyl groups in basic solution. There were three kinds of granules in the waterborne polyurethane/A-stage phenolic resin dispersion: core-shell, incomplete core-shell and pure polyurethane, depending on the condensation degree and the amount of phenolic resin. The average diameter of the particles in the dispersion and the distribution width of particle size became greater and wider, respectively, with increasing the proportion of phenolic resin,while the stability of the dispersion with regard to heat,mechanical effect and freezing-melting process and the C. C. C value decreased. It was proved that the stability of the dispersion was determined mainly by the electrical properties of the dispersion, therefore it should belong to real sol, but, to some extent, the dispersion also had some properties of macromolecular solutions. The properties of the coating film prepared by the polyurethane/phenolic resin dispersion were superior to those made of pure PU film, and could modified further by hybridization with SiO2-sol.