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不同粒径水性聚氨酯乳液的制备与性能研究

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不同粒径水性聚氨酯乳液的制备与性能研究
Preparation and Performance of Waterborne Polyurethane with Different Particle Size
投稿时间:2016-11-21
DOI:10.15918/j.tbit1001-0645.2018.04.015
中文关键词:粒径粒径分布吸水率
English Keywords:particle sizepartical size distribution (PDI)water absorption
基金项目:国家自然科学基金资助项目(61179031)
作者单位E-mail
柴春鹏北京理工大学 材料学院, 北京 100081
马一飞北京理工大学 材料学院, 北京 1000811120112348@bit.edu.cn
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中文摘要:
以异佛尔酮二异氰酸酯(IPDI)、聚(1,6-己二醇/新戊二醇-己二酸)(PHNA),1,4-丁二醇(BDO)、2,2-二羟甲基丙酸(DMPA)为主要原料、三乙胺(TEA)为中和剂,乙二胺(EDA)为后扩链剂,利用两种乳化方法和不同的DMPA用量制备了不同粒径的羧酸型水性聚氨酯乳液,使用动态光散射法测量其粒径和粒径分布,并测量了吸水率、拉伸强度、断裂伸长率、光泽度等性能.结果表明:制备的乳液粒径最小40 nm,最高340 nm,粒径分散系数(PDI)处于0.07~0.26之间,两种乳化工艺的粒径与粒径分布有明显差异;随着粒径的变化胶膜拉伸强度最高49.62 MPa,对应的断裂伸长率为922%,吸水率最低为5.25%,光泽度最高87.8°;粒径及粒径分布对吸水率、拉伸强度、光泽度等有重要影响,而对断裂伸长率影响不大.
English Summary:
Carboxylic waterborne polyurethanes with different particle size and particle size distribution were prepared by two kinds of emulsification with isophorone diisocyanate(IPDI),poly(1,6-hexanediol/neopentyl glycol-alt-adipic acid) (PHNA),1,4-butanediol (BDO) and dimethylol propionic acid (DMPA) as the hydrophilic chain extending agent. The particle size and particle size distribution were measured by dynamic laser scattering method,and the stability,water absorption,tensile strength,elongation at break and gloss were determined successively. Results show that,the particle size range is from 40 nm to 340 nm,the particle size distribution (PDI) range is from 0.07 to 0.26,and different DMPA content and emulsification can lead to different partical size and PDI;among the WPUs,the highest tensile strength is 49.62 MPa with a 922% elongation at break,the least water absorption is 5.25%,and the top gloss is 87.8°;the partical size and PDI have an important influence on water absorption,tensile strength and gloss,but little on the elongation at break.
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