Abstract: Biobased epoxy resin SIE-21 is synthesized by using isosorbitol as monomer to replace bisphenol A.The effects of the dosage,adding form and dropping speed of catalyst,as well as reaction time on SIE-21 are discussed.Biological waterborne curing agent for epoxy coatings is successfully prepared from SIE-21,diethylene triamine and polypropylene glycol diglycidyl ether.The effects of reaction time and temperature on the products are investigated.The curing performance of the optimized curing agent is tested also.The results verify that after addition of isosorbitol monomer,the curing agent exhibits a 17% of absorption rate to water,and has a certain tensile strength.As a bio-renewable raw material,isosorbitol can be used to prepare water-soluble curing agent for epoxy coatings.
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