Study on Preparation and Properties of Flexible Epoxy Resin

doi:10.19491/j.issn.1001-9278.2019.11.001

Abstract

Abstract: A type of flexible epoxy resin was synthesized by a two-step reaction, in which isophorone diisocyanate was first reacted with the hydroxyl group of epoxy resin to obtain a modified epoxy resin with the —NCO side groups and then polypropylene glycol (PPG) was grafted onto the side chains of the modified epoxy resin through the reaction between the hydroxyl groups of PPG and the —NCO groups on the modified epoxy resin to obtain polyether-grafted epoxy resin (PPG-g-EP) with different molecular weights (PPG400, PPG1000 and PPG2000). The structure of the resultant PPG-g-EP was characterized by titration and FTIR. The thermosetting PPG-g-EP was further prepared by using polyetheramine as a curing agent, and its mechanical properties were measured by a universal testing machine. The results indicated that the thermosetting PPG-g-EP with a longer PPG chain achieved higher elongation at break, and the PPG2000-modified epoxy resin gained the maximum elongation at break of 98 %.

Key words: epoxy resin, flexible, polypropylene glycol, elongation at break

CLC Number:

TQ323.5

HE Xiaoqian, ZOU Wei, WANG Hong, LI Chao, ZHANG Chen. Study on Preparation and Properties of Flexible Epoxy Resin[J]. China Plastics, 2019, 33(11): 1-5.

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