Acta Chimica Sinica ›› 2011, Vol. 69 ›› Issue (17): 2031-2038. Previous Articles     Next Articles

Full Papers

紫外光固化超支化聚酯的合成及性能

张林雅1,2,矫庆泽*,1,赵芸1,周明吉1,冯薇2,葛艳蕊2   

  1. (1北京理工大学化工与环境学院 北京 100081)
    (2河北科技大学化学与制药工程学院 石家庄 050018)
  • 投稿日期:2011-02-01 修回日期:2011-03-31 发布日期:2011-05-03
  • 通讯作者: 张林雅 E-mail:linyazhang@sina.com

Synthesis and Properties of UV-curable Hyperbranched Polyester

Zhang Linya1,2 Jiao Qingze*,1 Zhao Yun1 Zhou Mingji1 Feng Wei2 Ge Yanrui2   

  1. (1 School of Chemical Engineering and Environment, Beijing Institute of Technology, Beijing 100081)
    (2 College of Chemical Engineering, Hebei University of Science and Technology, Shijiazhuang 050018)
  • Received:2011-02-01 Revised:2011-03-31 Published:2011-05-03

Using the molten polycondensation, the second to fourth generation of hyperbranched polyesters with a great number of hydroxyl groups were synthesized and characterized based on the pentaerythritol as core and 2,2-bis(hydroxymethyl) propionic acid as arm. They had high branched degrees, low viscosity and good thermal stability. By methacryloyl anhydride, the hyperbranched polyesters were modified to be the hyperbranched methacrylates with C=C at the chain ends. The percent conversion could be reached above 89% under the optimum reaction conditions. The modified hyperbranched polyesters exhibited lower viscosity, two segmental thermogravimetric curve and lower glass transition temperature (Tg). When the hyperbranched methacrylates with low viscosity were applied in UV-curable coating for metals, it could take less solvent, fast coating speed and complete curing. The effects which the hyperbranched polyesters with different C=C contents took on the properties of UV-curable coating such as gel content, adhesive strength, impact strength, flexibility, hardness and the solvent resistances were studied. With the improvement of C=C contents, the gel contents were increased. Also the mechanical properties and solvent resistances of coatings were changed significantly. The experiments exhibited that it would help to gain the perfect UV-curable materials by choosing the hyperbranched polyesters with different contents of active groups.

Key words: hyperbranched polyester, methacryloyl anhydride, modified, UV-curable, coating