核桃壳三聚氰胺改性脲醛树脂的制备及其热降解性能表征  

Preparation and Thermal Degradation of Melamine-modified Urea-formaldehyde Resin From Walnut Shell

作　　者：许善锋 李竞[1] 罗兴 王韵焯 张嘉琳 肖辉[1] 陈玉竹[1] XU Shanfeng;LI Jing;LUO Xing;WANG Yunzhuo;ZHANG Jialin;XIAO Hui;CHEN Yuzhu(College of Forestry,Sichuan Agricultural University,Chengdu 611130,China)

机构地区：[1]四川农业大学林学院,四川成都611130

出　　处：《材料科学与工程学报》2021年第5期826-831,共6页Journal of Materials Science and Engineering

基　　金：国家级大学生创新训练计划项目(04054631)。

摘　　要：将超微粉碎后的核桃壳(WS)与甲醛溶液共混,在测定共混溶液反应活性的基础上将共混液作为添加剂与三聚氰胺改性脲醛树脂(MUF)进行共缩聚反应合成核桃壳粉胶(WSMUF),并对WSMUF树脂进行了基本性能检测和热行为分析。研究结果表明:在反应温度为90℃,反应时间为1h条件下WS与甲醛具有较好的反应活性。WS用于树脂合成的最佳添加量为m WS(核桃壳质量)/m(WS+U)(核桃壳与尿素的质量和)=0.15,所制备的板材甲醛释放量为0.35mg·L^(-1),相比未添加WS合成的MUF0树脂,甲醛释放量降低了69.43%,板材湿胶合强度降低21%,热降解峰值温度向高温方向偏移,同时炭残留量偏低。WS超微粉的添加在不改变胶层脆性基础上,能有效降低树脂体系游离甲醛和板材甲醛释放量。In this paper,the ultrafine pulverized walnut shell(WS)was blended with formaldehyde solution,and the melamine-modified urea-formaldehyde resin(MUF)added with WS(WSMUF for short)co-polycondensation resin was synthesized based on the determination of the reactivity of WS and formaldehyde solution,and the basic properties and thermal behavior were also discussed.The results indicates that the optimum reactivity temperature and time of WS to react with formaldehyde is 90℃and 1 h,respectively.Meanwhile,the optimum addition amount of WS for resin synthesis is m WS(walnut guality)/m(WS+U)=0.15,and the formaldehyde emission of the sheet was 0.35 mg·L^(-1),compared with the control resin without WS.The release amount of formaldehyde is reduced by 69.43%,and the wet bonding strength of the sheet is reduced by 21%,the peak temperature of thermal degradation is shifted to the higher temperature,and the residual amount of carbon become lower.The addition of WS would effectively reduce the free formaldehyde in the resin system and the formaldehyde release from the panels while not increase the brittleness of the glue line.

关 键 词：三聚氰胺改性脲醛树脂 核桃壳 热降解 热重分析 

分 类 号：X705[环境科学与工程—环境工程]