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Synthesis of Phenol-Urea-Formaldehyde Cocondensed Resins and Their Application

苯酚-脲-甲醛共缩合树脂的合成及其应用

基本信息

批准号：
04453140
负责人：
TOMITA Bunichiro
金额：
$ 4.86万
依托单位：
Institute of Agricultural and Forest Engineering, University of Tsukuba
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1993
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04453140/
关键词：
phenol urea cocodensation resol-type resin curing property C-13 NMR chemical structure adhesive peoperty

项目摘要

A new synthetic method to obtain phenol-urea-formaldehyde cocondensed resins was developed by reacting phenol itself with so-called "UF-concentrate", which was a kind of urea-formaldehyde resins prepared with higher molar ratio of formalhyde to urea. The products were analyzed with C-13 NMR spectroscopy and gel permeation chromatography. The ratio of cocondensation and the amount phenol incorporated into cocondenced resin were found to increase, when the UF-concentrate was prepared under alkaline conditions. It was also found that a resol-type cocondensed resins can be synthesized by alkaline treatments of the cocondensed resins which were prepared under acidic conditions.Curing process and thermal properties of the resol-type cocondenced resins were investigated by torsional braid analysis. The resol-type cocondensed resins displayd almost the same curing behaviors and heat-resistance as a commercial resol. Their apparent activation energies determined by measuring temperature dependence of gel time were almost identical with that of resol, and quite different from that of UF resin. Their adhesive performances were evaluated by plywood test with a cyclic boiling test and a 72 hrs boiling test. It was found that they can pass a JAS value for the special grade structural plywood.

本文提出了一种新的合成方法，即以苯酚为原料，与高醛脲摩尔比的脲醛树脂（UF-浓缩物）反应，合成苯酚-尿素-甲醛共缩聚树脂。产物用13 C NMR谱和凝胶渗透色谱进行了分析。当在碱性条件下制备UF浓缩物时，发现共缩合率和引入共缩合树脂的苯酚量增加。在酸性条件下制备的共缩聚树脂经碱处理后可合成甲阶酚醛型共缩聚树脂，并通过扭辫分析研究了该树脂的固化过程和热性能。酚醛型共缩聚树脂的固化行为和耐热性与商品酚醛树脂基本相同。通过测定凝胶时间与温度的关系，确定了它们的表观活化能，与甲阶酚醛树脂的表观活化能基本一致，而与脲醛树脂的表观活化能有较大差异。通过胶合板试验、循环煮沸试验和72小时煮沸试验评价了它们的胶合性能。结果表明，它们可以通过特级结构胶合板的JAS值。