| 摘要: |
| 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。 |
| 关键词: 溶剂残留 聚丙烯 包装材料 玻璃化转变温度 溶度参数 |
| DOI： |
| 分类号:TB484. 3; TB487 |
| 基金项目:北京市教委人才强教项目(IHLB No. PXM2010_014223_095557);科委面上项目(KM201110015001,KM2012 1001 5003);实验室建设项目(PXM2012_014223_000039);“高分子物理相似相容原理的实践教学冶教改项目 |
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| Research on Microstructure and Solvent Residue of Flexible Packaging Material |
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LI Dong-li, ZHANG Jing-yong, XU Wen-cai, FU Ya-bo
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Beijing Key Lab of Printing & Packaging Materials and Technology, Beijing Institute of Graphic Communication, Beijing 102600, China
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| Abstract: |
| 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. |
| Key words: solvent residue polypropylene packaging materials glass transition temperature solubility parameter |
