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为增强大豆蛋白/聚乙烯醇复合薄膜的综合性能,以纳米SiO2含量、分散剂聚乙烯基吡咯烷酮(PVPK-30)的含量、膜液pH值为影响因子,以薄膜拉伸强度、断裂伸长率、透光率、吸水率为主要评价指标,通过响应曲面试验确定纳米SiO2改性大豆蛋白/聚乙烯醇复合膜的最佳工艺条件。试验结果表明:当加入1.75%的SiO2纳米粒子(占大豆蛋白和PVA干重),1.20%的PVP(占纳米粒子干重),膜液的pH值控制在5.50时,复合薄膜的综合性能最好;与原大豆蛋白/PVA复合膜相比,改性后薄膜的抗张强度由4.61 MPa增加到9.76 MPa,断裂伸长率由64.98%提升到92.76%,透光率由15.54%升到24.12%,而吸水率由46.37%略降到45.28%。本试验为大豆蛋白/聚乙烯醇复合薄膜性能的改善以及生产应用提供理论和试验基础。
In order to enhance the comprehensive performance of soybean protein / polyvinyl alcohol composite film, the effects of nano-SiO2 content, content of polyvinylpyrrolidone (PVPK-30) and membrane pH on the tensile strength, elongation at break Rate, light transmittance, water absorption as the main evaluation index, through the response surface test to determine the optimum conditions of nano-SiO2 modified soy protein / polyvinyl alcohol composite film. The results showed that when the content of SiO2 nanoparticles (accounting for the dry weight of soybean protein and PVA), 1.20% PVP (dry weight of nanoparticles) and the pH value of membrane liquid were controlled at 5.50, the comprehensive performance of the composite membrane The tensile strength of modified films increased from 4.61 MPa to 9.76 MPa, the elongation at break increased from 64.98% to 92.76%, and the transmittance increased from 15.54% to 24.12, compared with the original soybean protein / PVA composite film. %, While the water absorption slightly decreased from 46.37% to 45.28%. This test provides theoretical and experimental basis for the improvement of the performance of soybean protein / polyvinyl alcohol composite film and its application in production.