THE RELATIONSHIP BETWEEN CURING REACTION AND WATER ABSORPTION FOR EPOXY AND PHENOLIC MODIFIEDEPOXY COMPOSITE COATINGS

J Chin Soc Corr Pro

1997, Vol. 17

Issue (3): 173-180 DOI:

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THE RELATIONSHIP BETWEEN CURING REACTION AND WATER ABSORPTION FOR EPOXY AND PHENOLIC MODIFIEDEPOXY COMPOSITE COATINGS

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Abstract The chemical reaction processes occurring during the curing of epoxy powder coating and the phenolic modified epoxy coating were investigated. The structures of these two coatings were also studied and the effect of crosslinked structure on water absorption of coatings was examined by the static immersion testing in distilled water at 90℃. The results showed that the curing reactions of phenolic modified epoxy coating consisted the reaction between epoxy and curing agent, the copolymerization between phenolic resin and epoxy, as well as the polymerization of phenolic, while the curing process of epoxy coating only consisted of the crosslinking between epoxy and dicyandiamide. The cross-linked density in the mixture structure of epoxy and phenolic resins increased because of the crosslinking between the two resins. The resistance of this coating to medium permeation was enhanced. The curing time of phenolic resin modified coating should be properly extended at high temperature so that the curing reaction could be conducted thoroughly and the more ideal structure of coating for enhanced permeation resistance could be obtained.

Key words: Epoxy Phenolic Coating Curing reaction Water absorption

Received: 25 June 1997

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ZHOU Zhongquan LI Jin LI Jing ZHANG Lixin HE Zhiduan KE Wei(State Key Laboratory of Corrosion and Protection; Institute of Corrosion and Protection of Metals;Chinese Academy of Sciences; Shenyang 110015) (Changchun Institute of Applied Chemistry; Chinese . THE RELATIONSHIP BETWEEN CURING REACTION AND WATER ABSORPTION FOR EPOXY AND PHENOLIC MODIFIEDEPOXY COMPOSITE COATINGS. J Chin Soc Corr Pro, 1997, 17(3): 173-180.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1997/V17/I3/173

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