HPMC/KGM水溶性包装薄膜的制备及性能研究

目的以魔芋葡苷聚糖(KGM)为基体,加入羟丙基甲基纤维素(HPMC)改性制备水溶性包装薄膜,探索HPMC改性后其力学性能最佳时HPMC的质量分数。方法通过将HPMC,KGM依次加入去离子水中制备共混溶液,再采用流延法制备薄膜,调节HPMC质量分数,测试并分析对薄膜结构和性能的影响。结果随着HPMC质量分数的增加,薄膜的拉伸强度和断裂伸长率呈先增大后减小的趋势,存在最大值;其水溶性基本呈逐渐降低的趋势,水溶性降低的幅度不大,仍能满足水溶性包装的需求;透光度逐渐升高,雾度逐渐降低,有利于应用在包装中。结论 HPMC和KGM质量分数为1%的成膜液,在HPMC质量分数为总量的20%时,薄膜力学性能较好。

Preparation of HPMC/KGM Water-soluble Packaging Film and Its Properties

The work aims to explore the mass fraction of HPMC with the best mechanical properties, with konjac glucomannan (KGM) as the matrix and hydroxypropyl methyl cellulose (HPMC) added to modify water-soluble packaging film. The HPMC and KGM were added into deionized water to prepare the blended solution successively, and then the film was prepared by casting method. The mass fraction of HPMC was adjusted, and the influence on its structure and properties was tested and analyzed. With the increase of HPMC mass fraction, the tensile strength and elongation at break of the films first increased and then decreased, and the maximum value existed. However, the water solubility of the films tended to decrease gradually and the decrease of the water solubility was still small, which could still meet the needs of the water-soluble packaging; the transmittance gradually increased and the haze gradually reduced, which was conducive to the application in packaging. For the film-forming liquid (mass fraction: 1%) of HPMC and KGM, the mechanical properties of the film are better when the mass fraction of HPMC is 20% of the total.