Improving characteristics of melamine–urea–formaldehyde resin by addition of blocked polyurethane prepolymer

被引：0
|
作者：
Jun Jiang
Xiaoning Lu
机构：
[1] Beijing Forestry University,College of Materials Science and Technology
[2] Nanjing Forestry University,College of Materials Science and Engineering
来源：
European Journal of Wood and Wood Products | 2017年 / 75卷
关键词：
Contact Angle; Moisture Content; Melamine; Fiber Saturation Point; Equilibrium Contact Angle;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
In this paper, the effect of blocked polyurethane prepolymer (BPUP) with four R values (the ratio of –NCO to –OH) and different blending proportions on the characteristics of melamine–urea–formaldehyde (MUF) resin were first investigated. The properties of the modified adhesive systems were examined by dynamic wettability and shear strength. The results indicated that the bonding performance and the wettability of high R value blending modification were superior to that of low R value case. In addition, the optimal bonding performance came from the MUF resin modified by 15% BPUP (R = 5) addition. Besides, the K value on wood substrates with different moisture contents (MC) was calculated by wetting model to interpret the wetting kinetics. The polymer blending adhesive has a potential capacity for making wood-based panels from high-moisture raw materials.
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页码：185 / 191
页数：6
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