酶解木质素改性三聚氰胺脲醛树脂的制备与应用

以酶解木质素（EL）、尿素（U）、甲醛（F）和三聚氰胺（M）为原料，采用碱反应工艺制备了酶解木质素改性三聚氰胺脲醛树脂（ELMUF）。分别考查了EL用量对制备的ELMUF树脂的固化时间、固化温度、游离甲醛量及其制备胶合板胶合强度和甲醛释放量等性能的影响，随着EL用量的增加，ELMUF树脂游离甲醛量从0.26%逐渐降低至0.12%，固化时间从96 s逐渐延长至152 s，黏度由86 mPa·s迅速升高至1 140 mPa·s。通过DSC测定不同EL用量的脲醛树脂固化过程，结果表明：随着EL用量的增加脲醛树脂的反应活性逐渐降低，固化温度由120.6℃逐渐升高至132.0℃，对热压工艺要求更加苛刻。

Synthesis and Application of Melamine Urea Formaldehyde Monolithic Resin Modified by Enzymolysis Lignin

The enzymolysis lignin modified melamine urea formaldehyde resin(ELMUF) was prepared by using the classic alkali-acid-alkali method with enzymolysis lignin(EL), urea(U), formaldehyde(F) and melamine(M) as raw materials. The influences of the amount of EL on the curing time, curing temperature, free formaldehyde content, the strength and formaldehyde release of the plywood obtained from the prepared ELMUF resin were investigated. With the increase of the amount of EL, the free formaldehyde content decreased from 0.26% to 0.12%, the curing time increased from 96 s to 152 s and the viscosity increased from 86 mPa·s to 1 140 mPa·s. The curing process of resins with different amounts of EL was determined by DSC. The results showed that the introduction of EL could reduce the reactivity of the urea-formaldehyde resin. With the increase of the amount of EL, the curing temperature increased from 120.6℃ to 132.0℃, which required the hot pressing process requirements to be more stringent.