摘要
为改善常温氧化法制备的小桐子蛋白胶黏剂胶合性能,选用蔗糖为改性剂,在KMnO4氧化作用下使反应体系中额外补充的蔗糖羟基转化为更多的醛类物质,与蛋白质充分交联反应制备小桐子蛋白胶黏剂。优化工艺,通过动态热机械分析法(DMA)和傅里叶变换红外光谱(FTIR)对蛋白胶黏剂的热性能和结构进行分析。结果表明:随着蔗糖添加量的增加,小桐子蛋白胶黏剂的胶合性能呈现先增加后减小的变化趋势,且当蔗糖添加量为小桐子粉质量的20%时,以KMnO4为氧化剂,其添加量为12%、氧化时间12 min、pH值为7时,所制胶黏剂具有最优良的胶合性能,制备的胶合板干状剪切胶合强度、24 h冷水湿强度、3 h温水(63℃)湿强度分别达到1.63、0.81、0.84 MPa,符合国家标准中Ⅱ类胶合板的性能要求。
The study incorporated sucrose as a modifier to improve the bonding performance of the Jatropha curcas protein adhesive,achieved through normal temperature oxidation.Utilizing KMnO4 oxidation,the excess hydroxyl groups of sucrose in the reaction were transformed into additional aldehydes,facilitating full crosslink-ing with the protein and thus forming the J.curcas protein adhesive.Dynamic thermomechanical analysis(DMA)and Fourier transform infrared spectroscopy(FTIR)instruments were used to analyze its thermal properties and structure.The results showed that with the increase of sucrose addition,the performance of J.curcas protein ad-hesive increased first,it also showed a decrease when the amount added was too much and the best sucrose dosage is 20%,the oxidation treatment protein adhesive has higher reactivity and excellent bonding performance when KMnO4 is used as the oxidant,the additive amount is 12%,the oxidation time is 12 minutes,and the pH value is 7.Its the dry strength of plywood as high as 1.63 MPa,the 3 h 63℃water soaking wet strength and 24 h cold wa-ter soaking strength were 0.84 MPa and 0.81 MPa,and that are all conformed the performance requirements of GB/T 9846-2015 for Type II plywood.
作者
张倩玉
陈艳华
丛郁锬
雷洪
杜官本
席雪冬
Zhang Qianyu;Chen Yanhua;Cong Yutan;Lei Hong;Du Guanben;Xi Xuedong(Yunnan Provincial Key Laboratory of Wood Adhesives and Glued Products,Southwest Forestry University,Kunming Yunnan 650233,China;College of Chemistry and Materials Engineering,Zhejiang A&F University,Hangzhou Zhejiang 311300,China)
出处
《西南林业大学学报（自然科学）》
CAS
北大核心
2024年第5期176-182,共7页
Journal of Southwest Forestry University：Natural Sciences
基金
云南省应用基础研究项目(202201AU070222,202101BD070001-074)资助
云南省教育厅科学研究基金项目(2022J0490,2023Y0697)资助。
关键词
常温氧化
小桐子饼粕粉
蔗糖
胶黏剂
normal temperature oxidation
Jatropha curcas powder
sucrose
adhesive
