含水率对三聚氰胺甲醛树脂浸渍薄木贴面性能的影响  

Effect of moisture content on overlaying performance of melamine formaldehyde resin impregnated thin veneer

作　　者：王蕊 田飞宇 徐德良 徐信武 WANG Rui;TIAN Feiyu;XU Deliang;XU Xinwu(College of Materials Science and Engineering,Nanjing Forestry University,Nanjing,Jiangsu 210037,China)

机构地区：[1]南京林业大学材料科学与工程学院,江苏南京210037

出　　处：《西北农林科技大学学报（自然科学版）》2020年第12期64-71,80,共9页Journal of Northwest A&F University(Natural Science Edition)

基　　金：国家木竹产业技术创新战略联盟科研计划项目(TIAWBI2018);湖北省技术创新专项重大项目(2019ABA097)。

摘　　要：【目的】研究薄木初含水率对三聚氰胺甲醛树脂浸渍后性能的影响,为薄木贴面的应用提供参考。【方法】以杨木、海棠木、松木薄木为材料,采用三聚氰胺甲醛树脂浸渍处理,制备装饰用浸渍薄木,研究薄木的初含水率对浸渍薄木的表面微观形貌、浸胶量、预固化度、挥发物含量以及浸渍薄木覆面纤维板贴面性能的影响。【结果】在相同浸渍工艺条件下,随着初含水率(0%~30%)的提高,浸渍薄木的浸胶量降低,杨木浸胶量从72.0%降低到59.3%,海棠木浸胶量从94.2%降低到84.4%,松木浸胶量从103.4%降低到86.1%;预固化度减小,杨木预固化度从20%降低到15%,海棠木预固化度从30%降低到19%,松木预固化度从由13%降低到6%;挥发物含量略有提高,杨木挥发物含量从8%增加到9%,海棠木挥发物含量从9%增加到10%,松木挥发物含量从8%增加到9%;贴面胶合强度呈先增大后减小的趋势,表面胶合强度最高可达2.1 MPa。【结论】为确保浸渍薄木的贴面性能,建议薄木初含水率控制在10%~20%。【Objective】The effects of initial moisture content of thin veneers on performance after melamine formaldehyde soaking were studied to provide reference for the application of thin veneers.【Method】Resin-impregnated poplar,Bintangor,and pine thin veneers were fabricated using melamine formaldehyde(MF)resin.The effect of initial moisture content(MC)on surface morphology,content of impregnated resin,degree of pre-curing,and content of volatile substances of the impregnated veneers were investigated.The bond strength of impregnated veneers on fiberboard substrate was also tested.【Result】Based on same impregnation process,the increase of moisture content from zero to 30%,the content of MF resin of poplar thin veneer decreased from 72.0%to 59.3%,the content of MF resin of bintangor thin veneer decreased from 94.2%to 84.4%,and the content of MF resin of pine thin veneer decreased from 103.4%to 86.1%.The degree of pre-curing of poplar thin veneer decreased from 20%to 15%,the degree of pre-curing of Bintangor thin veneer decreased from 30%to 19%,and the degree of pre-curing of pine thin veneer decreased from 13%to 6%.In contrast,the content of volatile substances of poplar thin veneer increased from 8%to 9%,the content of volatile substances of Bintangor thin veneer increased from 9%to 10%,and the content of volatile substances of pine thin veneer increased from 8%to 9%.The surface bonding strength firstly increased and then decreased with the optimal surface bonding strength of 2.1 MPa.【Conclusion】MC of thin veneers was suggested to be 10%to 20%to ensure strong overlaying performance.

关 键 词：浸渍薄木 初含水率 三聚氰胺甲醛树脂 贴面性能 

分 类 号：S785[农业科学—林学] TQ351[化学工程]