用纳米二氧化硅与聚丙烯树脂熔融共混,通过改变聚丙烯的结晶度、玻璃化转变温度、溶度参数的手段,来降低聚丙烯对有机溶剂的吸附性、溶解性和扩散性,进而降低印刷后聚丙烯薄膜中有机溶剂的残留。 实验表明,纳米二氧化硅能够明显提高聚丙烯的结晶度,提高其玻璃化转变温度,降低聚丙烯无定形区的比例,改性后的聚丙烯不但对非极性溶剂表现出低的残留值,而且对常见极性溶剂的溶解性也有较大程度的降低。

Polypropylene resin was melt blending with nano-silica to reduce the adsorption, solubility, and diffusivity of polypropylene against organic solvent by means of changing crystallinity, glass transition temperature, and solubility parameter of polypropylene. As a result, the solvent residue value of polypropylene film after printing was reduced. The experiments showed that nano-silica can significantly improve crystallinity and glass transition temperature of polypropylene, and reduce the proportion of amorphous region; the modified polypropylene shows a low residual value against not only non-polar solvent but also common polar solvent.