摘要
以异佛尔酮二异氰酸酯(IPDI)、聚乙二醇(PEG,Mw=600)和二羟甲基丙酸(DMPA)为主要原料,双酚A作扩链剂,在UV光固化水性聚氨酯大分子链中引入刚性芳环结构来改善涂膜的耐热性,产物结构经FT-IR证实。研究了DMPA含量、IPDI/PEG600摩尔比以及双酚A改性对乳液及涂膜性能的影响。结果表明,DMPA用量>5.76%后,乳液贮存稳定期可>6个月;随着DMPA用量从5.76%增加到9.04%时,乳液的平均粒径随DMPA含量的增大而变小,其值从90.16μm减小到43.30μm;IPDI/PEG600摩尔比>3.4时,涂膜外观及其涂膜性能较好;经双酚A扩链改性后的UVWPU固化膜的铅笔硬度为H、附着力1级、5%失重温度为233℃,较改性前提高了14℃,玻璃化转变温度提高了7.07℃,涂膜的附着力、铅笔硬度均得到了提高,涂膜在100℃条件下烘烤200h无变化。
The novel ultraviolet curable waterborne polyurethane（UVWPU） was synthesized by using isophorone diisocyanate（IPDI）,polyethylene glycol（PEG,Mw=600）,α,α-dimethylol propionic acid（DMPA） and bisphenol A.The rigid moiety was introduced into the polyurethane main chain to improve the heat resistance.The copolymer structure was confirmed by FT-IR.The effect of the molar ratio of IPDI/PEG600,dosage of DMPA and bisphenol A on the properties of latex and coating film were investigated.The results show that the storage stability of emulsion was longer than 6 months when the DMPA dosage was above 5.76%.With the DMPA dosage from 5.76% to 9.04%,the average particle diameter was decreased from 90.16 to 43.30μm.The UVWPU film exhibits good appearance and excellent properties when the molar ratio of IPDI/PEG600 was more than 3.4.The properties of the modified film were as follows： H of pencil hardness,1 of adhesion,5% weight-loss temperature at 233℃.The temperature of 5% loss weight was 14℃ and the Tg was 7.07℃ higher than the UVWPU without using bisphenol A.The heat resistance,pencil hardness and adhesion of the film were improved by using bisphenol A as the chain extender.No change was found after placed the modified film at 100℃ with 200h.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2010年第A01期72-75,共4页
Journal of Functional Materials
基金
石河子大学高层次人才启动基金资助项目(RCZX200712)
关键词
UV固化
水性聚氨酯
双酚A
改性
UV curing
waterborne polyurethane
bisphenol A
modified
