Synthesis and Curing Properties of UV Curable Hyperbranched Polyester Acrylate
Ning Chunhua1，2， Chen Qinyue1， Yong Hanyu1， Yin Qianwen1
1. School of Chemistry and Material Engineering， Changshu Institute of Technology， Changshu， Jiangsu 215506， China；
2. Jiangsu Laboratory of Adwanced Functional Materials， Changshu， Jiangsu 215506， China
Abstract: A novel UV-curable hyperbranched polyester acrylate （HPA） was prepared by pentaerythritol （PER）， 2，2-dimethylol propionic （DMPA）， succinic anhydride （SA） and hydroxyethyl methylacrylate （HEMA）.The structure of HPA was characterized by IR， NMR， molecular weight and distribution as well as viscosity. The UV curing properties of HPA were investigated. The synthesis conditions of HPA showed that the optimum conditions were determined as following： reaction time 6 h， reaction temperature 90 ℃， n[HP-（COOH）8]∶n（HEMA）=1∶8. When the optimum dosage of photoinitiator 1173 was 4.5％， the radiation energy of HPA was the lowest， 600 J／m2. The curing speed of HPA was 5-time higher than that of the same system with normal commercial oligomers such as RJ544， the double bond conversion rate of HPA could reach 89.8％.The prepared HPA under the optimal conditions allows its cured film to show pencil hardness 2H， adhesion 1 grade and flexibility 0.5 mm.