高摩尔比封闭异氰酸酯水性胶束的制备及其稳定性研究.doc


高摩尔比封闭异氰酸酯水性胶束的制备及
其稳定性研究#
邬洪川,李志国,张永良,顾继友**
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(东北林业大学材料科学与工程学院,哈尔滨,150040)
摘要:以六亚甲基二异氰酸酯(HDI)、聚乙二醇(PEG)和二羟甲基丙酸(DMPA)为原
料,在高摩尔比(异氰酸基与多元醇羟基摩尔比即 R 值>)条件下采用预聚体法制备了可
在水溶液中稳定分散的甲乙酮肟(MEKO)封闭型水性聚氨酯胶束。本文对高摩尔比封闭聚
氨酯胶束的形貌、粒径及其分布、结构及解封闭特性进行了表征与测试,重点考察了摩尔比
(R 值)、亲水基团含量(DMPA 含量)、中和度以及 Zeta 电位对高摩尔比封闭聚氨酯胶
束粒径与稳定性的影响。研究表明:反应条件对封闭聚氨酯胶束在水溶液中的稳定性具有显
著影响,其稳定性可由初始 Zeta 电位来判断。若在高摩尔比条件下制备可在水溶液中稳定
分散的封闭聚氨酯胶束,其中和度应在 100%,并且 DMPA 含量最低应在 %以上。
关键词:水性聚氨酯胶束;六亚甲基二异氰酸酯;高摩尔比;封闭;稳定性
中图分类号:0631
Preparation and stability research of blocked aqueous
polyurethane micelles with high moler ratio
Wu Hongchuan, lizhiguo, Zhang Yongliang, Gu Jiyou
(College of Material Science and Engineering,Nnortheast Forestry University,harbin,150040)
Abstract:
Aqueous polyurethane micelles blocked by methyl ethyl ketoxime (MEKO) were
prepared under the high molar ratio of –NCO to –OH (R>), using 2,6-hexamethylene
diisocyanate (HDI), polyethylene glycol (PEG) and dimethylol propionic acid (DMPA). In this
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paper, the morphology, structure, particle size and distribution,and de-blocking reaction of the
blocking polyurethane micelles with high molar ratio were characterized, and the effect of R value,
DMPA content, neutralization degree and zeta potential on the particle size and stability in water
was further explored. It has been shown that the reaction conditions has significant influence on
the stability of the blocking polyurethane micelles, and the stability in aqueous solution could be
determined by the initial Zeta potential. As the neutralization degree was at 100% and DMPA
s were more than %, the blocking polyurethane micelles prepared at high molar ratio
could be dispersed steadily in aqueous solution.
Key words: Aqueous polyurethane micelles; 2,6-Hexamethylene diisocyanate; High molar ratio;
Blocking; Stability
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0 引言
随着科技的发展和生活水平的提高,环境问题越来越受到人们的重视。水性聚氨酯具有
不燃、无毒、不污染环境等优异的环保特性以及性能可调节性,在涂料、胶粘剂、皮革涂饰
~3]
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亲水基团,利用亲水性基团和疏水性聚氨酯的两亲性质,通过自乳化或自