摘要
以玉米淀粉为原料,通过高碘酸钠在酸性条件下氧化得到双醛淀粉。将双醛淀粉与甲醛一起作为醛基给予体,与间苯二酚(R)共缩聚制备间苯二酚-双醛淀粉-甲醛(RDSF)树脂胶黏剂。研究了双醛淀粉用量、共反应p H、共反应温度和共反应时间对RDSF树脂胶黏剂固体含量、黏度、固化时间和胶接强度的影响。结果表明,双醛淀粉加入量为0. 15mol,共反应p H值为9. 0,共反应温度为70℃,共反应时间为90 min时,制得的RDSF树脂胶黏剂综合性能最佳,此时固体含量为42. 59%,黏度为725 m Pa·s,固化时间为53 s,干状胶合强度为1. 38 MPa,湿状胶合强度为1. 17 MPa。傅里叶变换红外光谱测试发现RDSF树脂的结构近似于间苯二酚-甲醛(RF)树脂,表明RDSF树脂可代替RF树脂使用。差示扫描量热分析发现RDSF树脂的固化温度和固化焓值低于RF树脂,固化峰值温度为77. 43℃,固化焓值为-238. 91 J/g,表明其固化能耗更低。
Dialdehyde starch was obtained by raw material corn starch oxidized with sodium periodate under acid condition. The resorcinol-dialdehyde starch-formaldehyde( RDSF) resin adhesive was prepared by resorcinol( R) copolycondensation with aldehyde donor of dialdehyde starch and formaldehyde. The effects of dialdehyde starch content,copolycondensation pH,copolycondensation temperature and copolycondensation time on solid content,viscosity,curing time and bonding strength of RDSF resin adhesive were studied. The results show that RDSF resin adhesive has the best comprehensive performance when the dialdehyde starch content is 0. 15 mol,copolycondensation pH is 9,copolycondensation temperature is 60 ℃ and copolycondensation time is 90 min. At this time,the solid content is 42. 59%,the viscosity is 725 m Pa·s,the curing time is 53 s,the dry bonding strength is 1. 38 MPa,and the wet bonding strength is1. 17 MPa. The FT-IR results show that the structure of RDSF resin is similar to that of resorcinol formaldehyde( RF)resin,which indicating that RDSF resin could be used instead of RF resin. DSC analysis shows that the curing temperature and curing enthalpy of RDSF resin are lower than those of RF resin,the peak curing temperature is 77. 43 ℃ and the enthalpy of curing is-238. 91 J/g,indicating that the curing energy consumption of RDSF resin is lower.
作者
李萍
吴义强
刘文杰
左迎峰
吕建雄
屠茹茹
Ping Li;Yiqiang Wu;Wenjie Liu;Yingfeng Zuo;Jianxiong Lii;Ruru Tu(College of Materials Science and Engineering,Central South University of Forestry and Technology , Changsha 410004 , China;Research Institute of Wood Industry,Chinese Academy of Forest,Beijing 100091,China)
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2019年第1期122-129,共8页
Polymer Materials Science & Engineering
基金
湖南省自然科学基金青年项目(2016JJ3184)
中国博士后科学基金面上项目(2015M572276)
中南林业科技大学大学生创新项目
关键词
间苯二酚
双醛淀粉
共缩聚
合成工艺
化学结构
固化性能
resorcinol
dialdehyde starch
copolycondensation
synthetic process
chemical constitution
curing performance