摘要
以核桃饼粕为基本原料,支化聚合物为改性剂,对其在木材胶接上的效果进行研究,同时,利用DSC热分析方法对不同支化聚合物用量下体系的固化历程进行表征分析,并借助FT-IR分析方法和SEM表征手段对支化聚合物改性核桃饼粕复合体系的结构变化和形貌特征进行分析。结果表明,支化聚合物与核桃饼粕复合体系对木材胶接具有优良的强度和耐水性,且不同支化聚合物配比下体系的固化峰值温度和胶接强度有一定差别,最优可满足国标中Ⅱ类胶合板的要求。FT-IR和SEM的分析进一步表明,支化聚合物与核桃饼粕之间形成氨基与羧基化学交联,形成的胶层更加致密、均匀和连续,是复合体系具有优良耐水性的重要化学基础。
In this work,taking the oil meal of walnut kernel as the basic material,and with the branched polymer as a modifier agent,an aldehyde free adhesive was prepared.The performance of the adhesive in the wood cementation was investigated.Meanwhile,differential scanning calorimetry(DSC)was used to analyze its thermal curing characteristics,and its structure composition and morphology characteristics of cured resins were explored via FT-IR and SEM,respectively.The results indicated that the plywood produced with hybrid system of walnut meal and branched polymer had excellent bonding strength and water resistance,and the branched polymer content had an positive effect on mechanical performance,the best result of bonding strength could meet the requirements of type Ⅱ plywood in national standard.The peak temperature of hybrid system was changing with branched polymer content.And the FT-IR and SEM results also indicated that the chemical crosslinking between walnut meal and branched polymer occurred via amino and carboxyl groups,and the compact,uniform and continuous characteristics were observed in cured hybrid system,which maybe an important chemical basis for excellent water resistance of the hybrid system.
作者
王辉
周晓剑
袁明懂
农顺福
WANG Hui;ZHOU Xiao-jian;YUAN Ming-dong;NONG Shun-fu(Southwest Forestry University/Yunnan Provincial Key Laboratory of Wood Adhesives and Glued Products,Kunming,650224 Yunnan,China)
出处
《西北林学院学报》
CSCD
北大核心
2022年第5期236-241,共6页
Journal of Northwest Forestry University
基金
云南省教育厅科学研究基金项目(2018JS336)。
关键词
核桃饼粕
支化聚合物
性能评价
无醛胶黏剂
walnut kernel meal
branched polymer
performance evaluation
formaldehyde-free adhesive
