聚乙烯醇-魔芋葡甘聚糖包装膜透光率与雾度

Light Transmittance and Haze of Poly(Vinyl Alcohol)-Konjac Glucomannan Packaging Film

目的研究影响聚乙烯醇-魔芋葡甘聚糖包装膜透光率和雾度的因素。方法以甘油、山梨醇为复配增塑剂,将纯化过的魔芋精粉和聚乙烯醇按一定质量比混合后水浴恒温共混,流延干燥制备包装膜,研究共混温度、共混时间、基料配比、复配增塑剂配比对包装膜透光率和雾度的影响。结果魔芋精粉和聚乙烯醇按质量比为1∶10混合,在水浴温度80℃下恒温共混3 h,加入质量分数为10%的复配增塑剂,复配增塑剂中山梨醇和甘油的质量比控制在1∶2～1∶3时制备的包装膜透光率和雾度达到最佳。结论各因素对包装膜的透光率和雾度有较大影响,原因是它们能促使魔芋葡甘聚糖分子和聚乙烯醇分子形成强烈的协同作用。

It aims to study the factors that influence the light transmittance and haze of poly（vinyl alcohol）-konjac glucomannan packaging film. With glycerol and sorbitol as compound plasticizer, purified konjac powder and poly（vinyl alcohol） were blended by water bath at constant temperature based on certain mass ratio, and then stretched and dr ied to prepare the packaging film. Effect of blending temperature, blending time, basic material proportioning and mixed ratio of plasticizer on the light transmittance and haze of the packaging film was studied. Purified konjac powder and PVA were mixed in accordance with the mass ratio of 1∶10, and blended by water bath at 80 ℃ for 3 h. Then 10% mixed plasticizer was added. When the mass ratio of sorbitol and glycerol in t he plasticizer was controlled at 1∶2～1∶3, the light transmittance and haze of the packaging film was the best. In conclusion, various factors have a great influence on light transmittance and haze of packaging film, because that they can help konjac glucomannan molecules and polyvinyl alc ohol molecules form strong synergy.