文献类型：期刊文献

英文题名：Melamine-modified urea formaldehyde resin for bonding particleboards

作者：Hse, Chung-Yun[1] Fu, Feng[2] Pan, Hui[3]

第一作者：Hse, Chung-Yun

通信作者：Hse, CY[1]

机构：[1]USDA, Forest Serv, So Res Sta, Pineville, LA USA;[2]Chinese Acad Forestry, Inst Wood Ind, Beijing, Peoples R China;[3]Louisiana State Univ, Calhoun Res Sta, AgCtr, Calhoun, LA USA

年份：2008

卷号：58

期号：4

起止页码：56-61

外文期刊名：FOREST PRODUCTS JOURNAL

收录：;EI(收录号：20082111274331);Scopus(收录号：2-s2.0-43749109561);WOS:【SCI-EXPANDED(收录号:WOS:000255289200006)】；

语种：英文

外文关键词：Forestry - Formaldehyde - pH effects

摘要：For the development of a cost-effective melamine-modified urea formaldehyde resin (MUF), the study evaluated the effects of reaction pH and melamine content on resin properties and bond performance of the MUF resin adhesive systems. Eight resins, each with three replicates, were prepared in a factorial experiment that included two formulation variables: two reaction pHs (i.e., 4.5 and 8.0) and four molar ratios of formaldehyde to urea to melamine (i.e., 3/2.2/0.3, 3/2.2/0.2, 3/2.2/0.1, and 3/2.2/0.05). Variables in particleboard preparation were two hot-press cured times (2 and 4 min). Thus, with two panel replications, a total of 96 panels were fabricated. Melamine content significantly affected resin properties and glue bond quality: gel time decreased, solid content increased, internal bond strength increased, thickness swell and water absorption decreased, and formaldehyde emission decreased as melamine content increased. In general, the resins catalyzed under acidic conditions (pH 4.5) resulted in faster gel times, higher internal bond strengths, lower formaldehyde emissions, and lower thickness swell and water adsorption than those catalyzed under alkaline conditions (pH 8.0). Significant correlation between gel time with both internal bond strength and formaldehyde emission suggest that resins with fast curing speeds provided favorable conditions for attaining a higher degree of resin cure, and in turn led to better bond strength and lower formaldehyde emission.