INFLUENCE OF URON RESINS ON THE PERFORMANCE OF UF RESINS AS ADHESIVES FOR PLYWOOD

Wei Gao, Jianzhang Li, Jianzhang Li

Abstract


Uron resin, a kind of urea-formaldehyde (UF) resin containing much more uron structure, were prepared.Several modi ed UF resins were obtained from mixing uron resins with normal UF resins as well as synthesizingUF resin with uron resin as raw material. is work demonstrated that the introducing of the uron structurereduced free formaldehyde content of UF resin and formaldehyde emission levels in bonded plywood panelssigni cantly, the former were reduced by 76% and 84% in the latter. e synthesis time of uron resin can beshortened to 8 hours. e test result of free formaldehyde content, formaldehyde emission levels and bondstrength indicated that specimen of 20 parts uron resin synthesized in 8 hours mixed with 100 parts UF resins(F/U molar ratio of 1.3) had a potential advantage to industrial application. e bene cial e ect of uron resin onthe performance of UF resin can be attributed to the opening of uron cycle structure and the following reactionwith free formaldehyde and its oligomeric glycol forms.

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