乙二胺后扩链TDI型聚氨酯水分散体的过程

发布时间：2018-05-14 04:19

本文选题：聚氨酯 + 分散体　；参考：《化工学报》2017年03期

【摘要】：以甲苯二异氰酸酯(TDI)、聚氧化丙烯二醇和二羟甲基丙酸等为主要原料制备了聚氨酯水分散体,研究了水、扩链温度、原料的—NCO/—OH摩尔比及扩链比对乙二胺(EDA)后扩链TDI型聚氨酯水分散体过程的影响。FT-IR测试表明,分散体中的H_2O可通过与聚氨酯中残留异氰酸酯基团(—NCO)的竞争反应影响EDA的后扩链过程。分子量及粒径与zeta电位测试表明,H_2O扩链导致分散体失稳;低扩链比时,H_2O对EDA的后扩链过程影响明显,但高扩链比时,后扩链聚氨酯的分子量降低;扩链温度升高,经EDA后扩链聚氨酯的分子量降低,而分散体粒径增大。当原料的—NCO/—OH摩尔比为1.20、扩链温度为30℃、扩链比为60%时,可有效降低H_2O对EDA后扩链聚氨酯过程的影响。
[Abstract]:Polyurethane water dispersions were prepared with toluene diisocyanate (TDI), polyoxypropylene glycol and dimethy propionic acid as main raw materials. The effects of water, chain expansion temperature, NCO/ OH molar ratio and chain expansion ratio on TDI type polyurethane water dispersions after ethylenediamine (EDA) were investigated. The.FT-IR test showed that the H_2O in the dispersions was H_2O. The molecular weight and particle size and zeta potential test showed that the dispersion of H_2O was caused by the molecular weight and the particle size and zeta potential, and the influence of H_2O on the post expansion chain process of EDA was obvious, but the molecular weight of the rear extended chain polyurethane was reduced when the ratio of the chain to the chain ratio was low; and the chain expansion temperature of the chain was reduced when the ratio of the chain to the chain ratio was low. After EDA, the molecular weight of the expanded chain polyurethane was reduced and the particle size of the dispersant increased. When the molar ratio of NCO/ to OH was 1.20, the chain expansion temperature was 30, and the chain expansion ratio was 60%, the effect of H_2O on the process of the expanded chain polyurethane after EDA could be effectively reduced.

【作者单位】：合肥工业大学化学与化工学院;先进功能材料与器件安徽省重点实验室;
【基金】：安徽省重点攻关项目(1301021016) 中国航空工业集团产学研项目(cxy2012HFGD24)~~
【分类号】：O631.1

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