Preparation of Melamine-Urea-Glyoxal (MUG) Resin and Properties of MUG Modified Poplar

Ying-ying SU; Bai-ling SUN; Yu-bo CHAI; An-min HUANG; Jun-liang LIU

doi:10.12326/j.2096-9694.2022036

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Preparation of Melamine-Urea-Glyoxal (MUG) Resin and Properties of MUG Modified Poplar
1.Research Institute of Wood Industry，Chinese Academy of Forestry，Beijing 100091，China
Vol. 36, Issue 5, Pages: 56-62(2022)
DOI： 10.12326/j.2096-9694.2022036

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苏莹莹,孙柏玲,柴宇博等.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[J].木材科学与技术,2022,36(05):56-62.

SU Ying-ying,SUN Bai-ling,CHAI Yu-bo,et al.Preparation of Melamine-Urea-Glyoxal (MUG) Resin and Properties of MUG Modified Poplar[J].Chinese Journal of Wood Science and Technology,2022,36(05):56-62.
苏莹莹,孙柏玲,柴宇博等.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[J].木材科学与技术,2022,36(05):56-62. DOI： 10.12326/j.2096-9694.2022036.

SU Ying-ying,SUN Bai-ling,CHAI Yu-bo,et al.Preparation of Melamine-Urea-Glyoxal (MUG) Resin and Properties of MUG Modified Poplar[J].Chinese Journal of Wood Science and Technology,2022,36(05):56-62. DOI： 10.12326/j.2096-9694.2022036.

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、pH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%。,2

Abstract

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 was 15.01s, 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.

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

Keywords

poplar modificationmelamine-urea-glyoxal resinsynthetic processphysical and mechanical properties

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