摘要
以对氨基苯酚(PAP)为改性剂,采用弱酸-弱碱-弱酸-弱碱法制备了脲醛树脂(UF),并着重探讨了不同因素对游离F含量和胶接强度的影响。研究结果表明:当第2批U加入后添加PAP、最终n(F)∶n(U)=1.1∶1.0、U分批加入质量比为55∶20∶15∶10、初始p H为5.0、反应温度为90℃和w(PAP)=4%(相对于U总质量而言)时,UF的游离F含量(0.18%)满足GB/T 14732—2006标准中的指标要求(≤0.3%)、胶接强度(1.08 MPa)满足GB/T 9846—2015标准中II类胶合板的指标要求,耐水性明显提高,胶合板的F释放量(1.22 mg/L)满足GB/T 18580—2001标准中E1级指标要求(≤1.5 mg/L)。
With p- aminophenol （PAP） as modifier, an urea-formaldehyde resin （UF） was prepared by weak acidity-alkalescence-weak acidity-alkalescence method, and the influences of different factors on free F （formaldehyde） contents and bonding strength were emphatically discussed. The research results showed that the free F content（O. 18%） in UF could meet the index requirement（no more than 0.3% ） in GB/T 14732--2006 standard, the bonding strength （1.08 MPa） could meet the index requirement of II-plywood in GB/T 9846--2015 standard, the water resistance could be also obviously improved, and the F emission（ 1.22 mg/L） in plywood could meet the index requirement（no more than 1.5 mg/L） of E, level in GB/T 18580--2001 standard when the PAP was introduced into system after adding the second batch U, final molar ratio of F to U was 1.1 ： 1.0, mass ratio of urea in batches was 55：20：15： 10, initial pH value was 5.0, reaction temperature was 90 ~C, and mass fraction of PAP was 4% in total U.
出处
《中国胶粘剂》
CAS
北大核心
2017年第5期34-37,共4页
China Adhesives
基金
绿色高分子材料学科方向资助项目
关键词
木材胶粘剂
对氨基苯酚
脲醛树脂(UF)
胶合板
胶接强度
甲醛释放量
wood adhesive
p- aminophenol （PAP）
urea-formaldehyde resin （UF）
plywood
bonding strength
formaldehyde emission
