以甲苯二异氰酸酯,聚酯、聚醚混合多元醇为基本原料,N-甲基二乙醇胺(MDEA)为亲水扩链剂,羟丙基聚二甲基硅氧烷、单硬酯酸甘油酯为改性剂,通过醋酸中和反应制备出疏水型自乳化阳离子水性聚氨酯乳液;研究了改性剂用量、R值(体系中-NCO和-OH的物质的量比)、MDEA含量和中和度对乳液耐水性的影响.结果表明:羟丙基聚二甲基硅氧烷和单硬酯酸甘油酯加入到聚氨酯体系中,均能显著提高聚氨酯的耐水性;胶膜吸水率随MDEA含量增加呈先降低后升高的趋势;当中和度小于100%时,胶膜吸水率随中和度的增大而减小;当中和度大于100%时,中和度对胶膜吸水率无明显影响.
参考文献
| [1] | KIM B K;LEE J C .Waterborne polyurethane and their properties[J].Application of Polymer Science,1996,34(06):1095. |
| [2] | Lee HT;Wu SY;Jeng RJ .Effects of sulfonated polyol on the properties of the resultant aqueous polyurethane dispersions[J].Colloids and Surfaces, A. Physicochemical and Engineering Aspects,2006(1/3):176-185. |
| [3] | Ajaya K.Nanda;Douglas A.Wicks .The influence of the ionic concentration,concentration of the polymer,degree of neutralization and chain extension on aqueous polyurethane dispersions prepared by the acetone process[J].Polymer: The International Journal for the Science and Technology of Polymers,2006(6):1805-1811. |
| [4] | SEBENIK U;KRAJNC M .Influence ofthe soft segment length and centent on the synthesis and proporties of isocyanate-terminated urethane prepolymers[J].International Journal of Adhesion and Adhesives,2007,27(07):527-535. |
| [5] | Piotr Krol .Synthesis methods, chemical structures and phase structures of linear polyurethanes. Properties and applications of linear polyurethanes in polyurethane elastomers, copolymers and ionomers[J].Progress in materials science,2007(6):915-1015. |
| [6] | 周延辉.水性聚氨酯耐水性研究进展[J].广东化工,2006(12):58-60. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%