多官能度类哑铃形光固化树脂合成及性能  

Synthesis and Properties of Polyfunctional Dumbbell Shaped UV-curable Resin

作　　者：沈文通 张慧娟 周宏勇[1] 杨永登[1] 张海召[1] 王家喜[1] 

机构地区：[1]河北工业大学化工学院,天津300130 [2]江苏省阜宁县危险化学品管理办公室,江苏盐城224400 [3]江苏省阜宁县高新创业园管理有限公司,江苏盐城224400

出　　处：《精细化工》2017年第12期1434-1440,共7页Fine Chemicals

摘　　要：以甲基丙烯酸-β-羟乙酯、异佛尔酮二异氰酸酯、六乙氧基双季戊四醇为主要原料,利用羟基与异氰酸酯的反应,合成出类哑铃型多官能度聚氨酯丙烯酸酯预聚物PUA1~PUA8,用FTIR及1HNMR确证了预聚物结构,用原位红外光谱考察了不同预聚物的光固化动力学。探讨了预聚物结构、体系双键密度对双键转化率、光固化速率及光固化后膜的铅笔硬度、附着力、柔韧性、凝胶率的影响。结果表明,延长丙烯酸酯间的距离,双键的转化率升高,PAU5及PAU1光照20 min后,丙烯酸酯双键的转化率分别为56%及36%。在同样的丙烯酸酯浓度下,适当增加丙烯酸酯官能团间距,可以在保持光固化速率及膜铅笔硬度的同时,提高固化膜的附着力及韧性。PAU5与1,6-己二醇二丙烯酸酯(HDDA)的复配体系光固化后的凝胶率达到99%,固化膜铅笔硬度为6 H,柔韧性可以保持为1.0 mm。A series of dumbbell shaped ten-functional polyurethane acrylate（ PUA1 ~ PUA8）prepolymers were prepared by a reaction of hydroxyl with isocyanate group using hydroxyethyl methylacrylate,isophorone diisocyanate and hexa-ethoxy dipentaerythritol as raw materials. The prepolymers were characterized by FTIR and nuclear magnetic resonance（1 HNMR） spectroscopy. The UV curing kinetics of different prepolymers were studies by in situ infrared spectroscopy. The effects of the prepolymer structure and the double bond density in the system on the double bond conversion rate,the reaction rate of UV curing,and the properties of cured film such as pencil hardness,adhesion,toughness and gel fraction were investigated. The results showed that the conversion rate of double bond increased with extending the distance between acrylate groups. After PAU5 and PAU1 were cured for 20 minutes,their double bond conversion rate was 56% and 36%,respectively. At the same molar concentration of acrylate group,the proper increase of the interfacial distance between the acrylates could improve the adhesion and toughness of cured films while maintaining the curing speed and film hardness. The gel fraction of film cured by combination of PAU5 with HDDA could reach 99%. Thehardness of film was 6 H and the toughness maintained at 1. 0 mm.

关 键 词：聚氨酯丙烯酸酯 多官能度 哑铃形 光固化 丙烯酸系列化学品 

分 类 号：TQ637[化学工程—精细化工]