基于UFC和葡萄糖改性脲醛树脂的合成与性能  

Synthesis and Properties of Modified Urea-Formaldehyde Resin Based on UFC and Glucose

作　　者：侯志兵 张亚伟 方建林 迟洋 甘卫星 HOU Zhi-bing;ZHANG Ya-wei;FANG Jian-lin;CHI Yang;GAN Wei-xing(School of Resources,Environment and Materials,Guangxi University,Nanning 530004,Guangxi,P.R.China)

机构地区：[1]广西大学资源环境与材料学院,广西南宁530004

出　　处：《林产工业》2021年第4期53-58,共6页China Forest Products Industry

基　　金：广西科技重大专项(桂科AA17204067,桂科AA18118044);国家科技支撑计划项目(2015BAD14B03);国家自然科学基金项目(31360158)。

摘　　要：在碱性条件下用尿素和甲醛合成脲醛预缩液(UFC),然后用UFC与尿素制备脲醛树脂(UFC/U),并添加葡萄糖对UFC/U改性得到G/UFC/U树脂,采用DSC和FT-IR等对树脂进行分析。结果表明:与普通脲醛树脂(UF)相比,UFC/U树脂胶合强度提高5.83%,游离甲醛含量降低3.70%,G/UFC/U树脂贮存期大于30 d,综合性能较好,G_(1-25)/UFC/U树脂游离甲醛含量降低44.44%,胶合板湿胶合强度为1.11 MPa,优于国家II类胶合板标准;DSC结果表明:UFC/U、G_(1-25)/UFC/U比UF树脂的固化特征温度高;FT-IR分析表明:G_(1-25)/UFC/U和UF树脂相比,羟基及亚甲基醚键的峰强度增强,改性树脂的羟甲基优先和葡萄糖分子C(6)的羟基发生反应生成亚甲基醚键。Under alkaline conditions,urea-formaldehyde condense(UFC)was first synthesized with urea and formaldehyde,and used to synthesize urea-formaldehyde resin(UFC/U)with urea.The urea formaldehyde resin(G/UFC/U)was modified by adding glucose in the synthesis process.Resin was analyzed by means of DSC and FT-IR.The results showed that:the bonding strength of UFC/U increased 5.83%,and the free formaldehyde content decreased by 3.70%,compared with UF.The comprehensive properties of G/UFC/U were better,the storage period more than 30 days.The content of free formaldehyde in G_(1-25)/UFC/U resin was reduced by 44.44%,and the corresponding wet bonding strength of plywood was 1.11 MPa,which beyond the national II plywood standard.DSC results showed that:the curing character temperature of UFC/U and G_(1-25)/UFC/U was higher than UF resins.FT-IR analysis showed that:compared with UF resin,the strength of hydroxyl and methylene ether bond peak of G_(1-25)/UFC/U was enhanced,indicating that hydroxymethyl of urea-formaldehyde resin preferentially reacted with hydroxyl at C(6)in glucose molecule to form methylene ether bond.

关 键 词：脲醛预缩液 葡萄糖 脲醛树脂 性能 FT-IR DSC 

分 类 号：TS653[轻工技术与工程] TQ43[化学工程]