膨润土含量对淀粉膜性能的影响
Effect of Bentonite Content on Properties of Starch Film

膨润土是指的一种是指以天然碳酸盐矿物和蒙脱石为主要微观结构成分矿物的黏士，是目前较具典型形态的层状硅酸盐矿物之一。研究淀粉膜的制备过程及膨润土含量对淀粉膜各种性能的影响，添加2%、4%、6%、8%、10% (以淀粉质量计)浓度膨润土，通过测定抗拉强度，断裂延展率，透水蒸气性，透油性，透光性，透红外性分析膨润土浓度与淀粉膜性能的关系。结果表明：随着膨润土浓度的提高，淀粉复合膜的抗拉强度由384.23 Mpa提升到1056.59 Mpa，断裂延展率由13.85%降低到8.53%，透水系数由2.7019 g？mm/(m²？d？kPa)降低到了2.7019 g？mm/(m²？d？kPa)，透油系数由0.5929 g？m/(d？m²)降低到0.1317 g？m/(d？m²)，透光率由47.50%降低到14.35%。膨润土的加入降低了淀粉膜的透过性与断裂延展率，提升了淀粉膜的抗拉强度，红外检测官能团化学键共振强度降低。
Bentonite is a kind of clay with natural carbonate minerals and montmorillonite as the main microstructure components. It is one of the layered silicate minerals with typical forms at present. The preparation process of starch film and the influence of bentonite content on various properties of starch film were illustrated. Bentonite concentration of 2%, 4%, 6%, 8% and 10% (calculated by starch quality) was added, and the relationship between bentonite concentration and properties of starch film was analyzed by measuring tensile strength, fracture elongation, water vapor permeability, oil permeability, light permeability and infrared permeability. The results show that: With the increase of bentonite concentration, the tensile strength of starch composite membrane increased from 384.23 Mpa to 1056.59 Mpa, the fracture elongation decreased from 13.85% to 8.53%, and the permeability coefficient decreased from 2.7019 g？mm/(m²？d？kPa) to 2.7019 g？mm/(m²？d？kPa). The oil permeability coefficient decreased from 0.5929 g？m/(d？m²) to 0.1317 g？m/(d？m²), and the transmittance decreased from 47.50% to 14.35%. The addition of bentonite reduces the transmittance and fracture elongation of starch film, improves the tensile strength of starch film, and reduces the chemical bond resonance strength of functional groups detected by infrared.