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The hydrolytic stability and structure of the cured melamine-urea-formaldehyde resin
The Journal of Adhesion ( IF 2.2 ) Pub Date : 2021-05-31 , DOI: 10.1080/00218464.2021.1930536
Zhongjian Ding 1 , Zhongqiang Ding 2 , Doudou Zhang 1 , ChangMen Chao 1
Affiliation  

ABSTRACT

The hydrolysis of cured melamine-urea-formaldehyde (MUF) resin leads to the increment of formaldehyde emission of the MUF resin-bond wood boards. To learn the influencing factors on the hydrolytic stability of cure MUF resin, a variety of amino resins (UF resin, MF resin, MUF resin) were synthesized in the laboratory. The amount of formaldehyde liberated and mass loss of cured amino resins were attained after acidic hydrolysis. The branched structure of cured MUF resins with different melamine levels added at different addition stages was characterized by the XRD technology. The relationship between the hydrolytic stability and branched structure of cured MUF resin was disclosed. The TG and DSC curves of MUF and UF resins were obtained by the differential scanning calorimetry (DSC) at the normal pressure. Their DTG curves were obtained by taking the first derivative of TG curves. The DTG curve shows the variation of the mass-loss rate of UF resin and MUF resin with temperature. The results indicate that the hydrolytic stability of cured MUF resin is lower than that of cured UF resin. The melamine decreases the hydrolytic stability of cured MUF resin by increasing the branched degree of cured MUF resin. The melamine added at different stages affects the branching structure of cured MUF resins in different ways.



中文翻译:

固化后的三聚氰胺脲醛树脂的水解稳定性和结构

摘要

固化的三聚氰胺-脲醛(MUF)树脂的水解导致MUF树脂粘合木板的甲醛释放量增加。为了解固化MUF树脂水解稳定性的影响因素,在实验室合成了多种氨基树脂(UF树脂、MF树脂、MUF树脂)。酸水解后得到甲醛释放量和固化氨基树脂的质量损失。通过XRD技术表征了在不同添加阶段添加不同三聚氰胺水平的固化MUF树脂的支化结构。公开了固化的MUF树脂的水解稳定性与支化结构之间的关系。MUF和UF树脂的TG和DSC曲线是通过差示扫描量热法(DSC)在常压下获得的。它们的DTG曲线是通过对TG曲线求一阶导数得到的。DTG曲线显示了UF树脂和MUF树脂的失重率随温度的变化。结果表明固化的MUF树脂的水解稳定性低于固化的UF树脂。三聚氰胺通过增加固化MUF树脂的支化度来降低固化MUF树脂的水解稳定性。不同阶段添加的三聚氰胺以不同方式影响固化MUF树脂的支化结构。三聚氰胺通过增加固化MUF树脂的支化度来降低固化MUF树脂的水解稳定性。不同阶段添加的三聚氰胺以不同方式影响固化MUF树脂的支化结构。三聚氰胺通过增加固化MUF树脂的支化度来降低固化MUF树脂的水解稳定性。不同阶段添加的三聚氰胺以不同方式影响固化MUF树脂的支化结构。

更新日期:2021-05-31
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