Chem. J. Chinese Universities ›› 2023, Vol. 44 ›› Issue (11): 20230221.doi: 10.7503/cjcu20230221

• Polymer Chemistry • Previous Articles     Next Articles

Fabrication and Performance of UV⁃curable Silicone Modified Polyurethane UV Curing Macroinitiators from Irgacure⁃2959

YUAN Hongping, ZHU Hongyu, SUN Nana, CHEN Jie, HUANG Chuanxia, LI Meijiang(), LI Wenqing, LAI Guoqiao(), YANG Xiongfa()   

  1. College of Material,Chemistry and Chemical Engineering,Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education,Key Laboratory of Silicone Materials Technology of Zhejiang Province,Hangzhou Normal University,Hangzhou 311121,China
  • Received:2023-04-30 Online:2023-11-10 Published:2023-07-06
  • Contact: LI Meijiang E-mail:limeijiang@hznu.edu.cn;gqlai@hznu.edu.cn;yangxiongfa@hznu.edu.cn
  • Supported by:
    the “Pioneer” and “Leading Goose” Research and Development Program of Zhejiang Province, China(2023C01188)

Abstract:

To overcome the disadvantages of small molecule ultraviolet(UV) initiators such as toxicity, having an unpleasant odor, easy to turn yellow and migrate from UV cured materials and to solve the oxygen resistance in UV curing industry, UVcurable silicone modified polyurethane UV curing macroinitiators were synthesized from 2hydroxy4'(2hydroxyethoxy)2methylacetone(Irgacure2959), castor oil, hydroxyhydrocarbon silicone oil, isophorone diisocyanate and hydroxypropyacrylate. Subsequently, it was adopted to prepare highly transparent UVcurable materials by UVcurable polyurethane acrylate prepolymers. The results showed that when the amount of UV initiator obtained was 3%(mass fraction) and the curing time was 70 s, the UVcurable materials prepared exhibited fairly good performance with pencil hardness of 2H—4H, transmittance above 80%, tensile strength about 26.4 MPa, elongation increased from 18% to 42%. The migration rate of Irgacure2959 was 7.2% and the UVcurable material prepared with it turned significantly yellow after UV aging for 4 min. By contrast, the migration rate of the UVcurable silicone modified polyurethane UV curing macroinitiators was as low as 2.1%, and the UVcurable material prepared with it turned slightly yellow even after UV aging for 14 min. It can be convinced that fabrication of UVcurable silicone modified UV curing macroinitiators is an effective strategy to reduce the migration rate of UV initiators and improve the UV resistance and flexibility of UVcurable materials.

Key words: UV?curable material, Macroinitiator, Silicone, Polyurethane

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