文献类型：期刊文献

中文题名：三聚氰胺-尿素-乙二醛树脂合成及其改性杨木物理力学性能

英文题名：Preparation of Melamine-Urea-Glyoxal(MUG) Resin and Properties of MUG Modified Poplar

作者：苏莹莹[1] 孙柏玲[1] 柴宇博[1] 黄安民[1] 刘君良[1]

第一作者：苏莹莹

机构：[1]中国林业科学研究院木材工业研究所,北京100091

年份：2022

卷号：36

期号：5

起止页码：56-62

中文期刊名：木材科学与技术

外文期刊名：Chinese Journal of Wood Science and Technology

收录：CSTPCD;;北大核心:【北大核心2020】；

基金：中央级公益性科研院所基本科研业务费专项资金“无甲醛氨基树脂改性杨木关键技术研究与示范”(CAFYBB2021QA002)。

语种：中文

中文关键词：杨木改性;三聚氰胺-尿素-乙二醛(MUG)树脂;合成工艺;物理力学性能

外文关键词：poplar modification;melamine-urea-glyoxal resin;synthetic process;physical and mechanical properties

分类号：S781.7;S792.11;TS65

摘要：以乙二醛替代甲醛合成木材浸渍改性用三聚氰胺-尿素-乙二醛(melamine-urea-glyoxal,MUG)树脂,通过对不同温度、p H值、原料配比条件下合成的MUG树脂性能进行分析,优选出较佳的合成工艺,并用优化工艺合成的MUG树脂对杨木进行改性。结果表明:当反应pH值在4~5,反应温度为65℃,M、U、G量比为0.08∶0.40∶1.00时,合成的MUG树脂性能较佳,黏度为15.01 s,固体含量为49.89%,水混合性大于10,储存时间大于90 d。质谱和红外光谱分析结果表明三聚氰胺、尿素和乙二醛三者之间发生了化学反应,并且合成产物主要为低聚物,相对分子质量小于600;同时热分析结果显示,90℃之后树脂开始固化,并在169℃处出现了明显热固化吸热峰。与未处理材相比,当MUG树脂质量分数为20%时,改性杨木的抗弯强度和弹性模量的增幅最大,分别为17.5%和18.5%。
In this study, melamine-urea-glyoxal(MUG) resin was synthesized by replacing formaldehyde with glyoxal. The synthesis of MUG was used to modify poplar wood. To achieve optimized synthesis condition, MUG resin was synthesized under different temperatures, pH values, and mole ratios. The performance of each synthesis was analyzed. The results showed that when the reaction pH value was 4~5, the reaction temperature was 65 ℃, and the molar ratio of melamine-urea-glyoxal was 0.08∶0.40∶1.00, the performance of the synthesized MUG resin performed optimally. The resin viscosity was15.01s, the solid content was 49.89%, the water miscibility was greater than 10, and the storage time was greater than 90 days. Through mass spectrometry and infrared spectroscopy, it was found that the chemical reactions occurred between melamine, urea and glyoxal, and the synthesized products were mainly oligomers with relative molecular mass less than 600. According to TG-DSC analysis, the resin began to cure after 90 ℃. An obvious thermal curing endothermic peak appeared at 169 ℃. Compared with untreated wood, when the mass fraction of MUG resin was 20%, the modulus of ruptures(MOR)and modulus of elasticity(MOE) were increased by 17.5% and 18.5%, respectively.