摘要
以甲苯二异氰酸酯（TDI）、聚酯二醇和二羟甲基丙酸（DMPA）等为原料，采用一步法工艺制备了含羟基聚氨酯水分散体，探讨了聚酯二醇的种类、DMPA含量和NCO／OH摩尔比、中和剂及用量等对水分散体稳定性的影响，利用红外和粒度分析等方法表征了该体系的结构和胶粒尺寸。实验结果表明，随着亲水性离子用量增加，水分散体的粒径变小，稳定性增强，且在同样条件下采用不同的聚酯二醇制备的分散体粒径有一定的差异；采用JS307—110和JS308—110为原料时，最佳的NCO／OH摩尔比分别为0．91和0．85左右，其分散体粒径分别为60nm和90nm；采用三乙胺为中和剂，中和度为90％-100％时可得到稳定的水分散体。
Waterborne hydroxy-functional polyurethane dispersions were synthesized by one-step process using toluene diisocyanate （TDI）, polyester diol and dimethylolpropionic acid （DMPA） as materials. And the effect of the kind of polyester diol, DMPA content, mol ratio of NCO group to OH group, the neutralizer and degree of neutralization on the stability of polyurethane dispersions were discussed. The chemical structure and colloid particle size of polyurethane dispersions were characterized with infrared spectroscopy and particle-size analyzer. The experiment results show that in one-step process, as the content of hydrophilic ion increased, the particle size of the dispersions is increased, the stability is enhanced, and the particle sizes are different when using different polyester glycol as reactant at the same condition. The optimal ratio of NCO group to OH group are respectively 0.91 and 0.85 using JS307-110 and JS308-110 as material, and the particle size are respectively 60nm and 90nm. Meanwhile, sable polyurethane dispersions can also be obtained when using triethylamine as the neutralizing agent and keeping the degree of neutralization at 90% - 100%.
出处
《聚氨酯工业》
2006年第5期17-20,共4页
Polyurethane Industry
关键词
水性聚氨酯
一步法
分散体
waterborne polyurethane
one-step process
dispersions
