摘要
采用聚四氢呋喃醚二醇(PTMEG,Mn=2000)、异佛尔酮二异氰酸酯(IPDI)和1,4-丁二醇(1,4-BD)为主要原料合成了非离子水性聚氨酯乳液。采用三羟甲基丙烷聚乙二醇单甲醚(TMPEG,Mn=1200)作为非离子型亲水扩链剂,将重复的(—CH2CH2O—)引入聚氨酯大分子中,作为侧链。采用傅里叶变换红外表征了非离子聚氨酯的结构。使用电子拉力试验机研究了氰羟比R值[n(—NCO)/n(—OH)]、交联剂三羟甲基丙烷(TMP)和后扩链剂乙二胺(EDA)的用量对非离子型水性聚氨酯力学性能和吸水溶胀比的影响。透射电镜(TEM)图片和乳液粒径测试证实了非离子聚氨酯能够很好地分散在水中,并且粒径随TMPEG用量增大而减小。研究结果表明,R值的增大和TMP、EDA用量的提高都使得胶膜拉伸强度增大,而断裂伸长率和吸水溶胀比下降。
The title aqueous dispersions of non - ionic polyurethane were prepared by reaction of poly （oxytetramethylene） glycol（ PTMEG, M, = 2 000） , isophorone diisocyanate （IPDI） and 1,4 - butandiol （1, 4 -BD）. Then repeating （-CH2CH2O-） groups were successfully introduced by use of the trimethylol propane poly （ethylene glycol monomethyl ether）as non -ionic hydrophilic chain extender. （TM- PEG, M, = 1 200） on the polymer backbone as side chain, Fourier transform infrared（ FT - IR） was used to characterize the structure of the PU product. The effects of R[ n（-NCO）/n（-OH）] , amounts of trimethylol propane （TMP） and ethylenediamine（EDA） on the mechanical properties and swelling properties were analyzed by electronic tensile tester. Transmission electron microscopy （TEM） images and particle size measurement of the emulsions indicated that the synthesized PU was well dispersed in water, and the particle size decreased with increasing the amount of TMPEG. The results showed that tensile strength improved while elongation at break and swelling property reduced when increasing R, amounts of TMP and EDA.
出处
《涂料工业》
CAS
CSCD
北大核心
2011年第6期46-50,共5页
Paint & Coatings Industry
关键词
非离子聚氨酯
乳液
粒径
力学性能
形貌
non - ionic polyurethane
dispersions
particle size
mechanical properties
morphology
