改性聚醋酸乙烯酯乳液的研究进展

PVAc乳液成本低廉、无环境污染、粘接强度高,是一种环保型胶黏剂,广泛用于多孔性材料特别是木材间的胶合.但其本身存在着耐水性能差等缺点,即在湿热条件下其粘接强度会有很大程度下降.综述了近年来国内外对聚醋酸乙烯酯乳液在共混、共聚、保护胶体、乳化体系和引发体系五种改性的研究进展,并首次从联合改性(即结合两种或两种以上改性方法)的角度阐述了聚醋酸乙烯酯乳液的研究进展及今后的发展方向.通过改性,PVAc乳液的性能特别是耐水性能大大提高,扩大了其应用范围.

Progress in Study on Modification of Polyvinyl Acetate Emulsion

PVAc emulsion is a kind of environmental adhesive which is low cost, no pollution and high bonding strength. It is widely used in bonding porous material, especially the wood. However, PVAc emulsion has some disadvantages, such as poor water resistance, it means that the bonding strength will decrease greatly in hot and humid circumstance. Recent progress in study on modification of PVAc emulsions in and abroad is reviewed based on the blending, copolymer, protective colloid, and emulsification and initiation systems. The progress in research on polyvinyl acetate emulsion and its development trend is introduced from the aspect of united modification which is a combination of two or more than two modification methods. The performance of the PVAc emulsion, especially the water resistance is improved greatly by modification, which extends its application.