无机填料对EVA热熔胶性能的影响

Influences of inorganic fillers on properties of EVA hot melt adhesive

通过固定EVA(乙烯-醋酸乙烯酯共聚物)、石蜡、PE(聚乙烯)蜡、松香甘油酯和抗氧剂的比例,改变无机填料的掺量及类型,制备了相应的HMA(热熔胶)。研究结果表明:随着无机填料掺量的增加,HMA的黏度、拉伸强度和硬度上升,180°剥离强度呈先升后降态势,断裂伸长率下降;碳酸钙、滑石粉和高岭土这3种无机填料对HMA的软化点有不同的影响,软化点随碳酸钙掺量增加而升高,随滑石粉掺量增加而下降,随高岭土掺量增加而变化较小;HMA各方面的性能随无机填料粒径变小而提高。

The corresponding HMA （hot melt adhesive） was prepared when the ratio among EVA （ethylenevinyl acetate copolymer） , paraffin, PE （polyethylene） wax, rosin glyceride and antioxidant was fixed, the contents and types of inorganic fillers were changed. The research results showed that the HMA＇ s viscosity, tensile strength and hardness were increased, 180°-peeling strength had the trend of rise-fall, and the elongation at break was decreased with increasing inorganic filler content. The influences of three fillers （such as calcium carbonate, talcum powder and kaolin） on HMA＇s softening point were different, the softening point was increased with increasing calcium carbonate content but it was decreased with increasing talcum powder content, and its change was smaller with increasing kaolin content. The HMA＇ s properties in all aspects were increased with decreasing inorganic filler particle size.