페이지 정보작성자 최고관리자 작성일18-01-10 10:40 조회820회 댓글0건
This presentation will focus on various aspects of various aspects of urea-formaldehyde (UF) resin
adhesives to reduce formaldehyde emission, including hydrolysis of UF resin, lowering
formaldehyde/urea (F/U) mole ratio, modification of UF resins, or UF resin penetration into wood
cell wall. As well known, the formaldehyde is emitted from wood-based composite panels bonded
with UF resins by its hydrolysis, reversible reactions to the synthesis reactions of UF resin. I
n order to reduce the formaldehyde emission, one of the most promising ways is to reduce F/U
mole ratio for UF resin synthesis. However, lowering F/U mole ratio provide lower emission at the
expense of the loss of some mechanical properties. Thus, various ways of modifying UF resins
have been attempted such as addition of scavengers or isocyanate resin. In addition, the UF resin
penetration into wood cell wall is important to achieve a good adhesion in reconstituted wood
composites, which will be covered by this presentation.
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