不同合成树脂工艺对改性材性能影响研究

Effects of Different Synthetic Resin Processes on the Properties of Modified Wood

为研究树脂对改性材性能的影响,采用2种不同工艺合成三聚氰胺-脲醛树脂(MUF),测试了树脂的相关性能。结果表明,不同合成工艺路线下制备的MUF树脂在固体含量、粘度、固化时间、游离甲醛含量间存在显著差异。最终树脂的分子结构类型相似性极高,但相同结构组分在不同树脂中所占比例各有差异。羟甲基基团在MUF2中所占比例高,而亚甲基桥键及醚键在MUF1中含量高。MUF1改性材的增重率(weight percent gain,WPG)值更大,但MUF2改性材的抗溶胀性(anti-swelling efficiency,ASE)和体积膨胀率(bulking rates,B)更高,MUF2改性材的尺寸稳定性更好。

In order to study the effect of resin on the properties of modified materials,melamine-urea-formaldehyde(MUF)resins were synthesized by two different processes and their properties were tested.The results showed that there were significant differences in solid content,viscosity,curing time and free formaldehyde content.The molecular structure of the final resin was very similar,but the proportions of the same structure components in different resins were different.The proportion of hydroxymethyl group in MUF2 was more,while the content of methylene bridge bond and ether bond in MUF1 was higher.The WPG(weight percent gain)of the MUF1 modified wood was greater than that of MUF2,but the ASE(anti-swelling efficiency)and B(bulking rates)of the MUF2 modified wood were higher,and the dimensional stability of the MUF2 modified wood was better.