玉米淀粉基缓释膜的制备及表征

Preparation and Characterization of Release Film from Corn Starch

[目的]研究玉米淀粉基缓释膜的制备条件及特征。[方法]以玉米淀粉与聚乙烯醇为原料,在交联剂的作用下,制得包膜料液,用此料液给尿素涂膜,制得包膜尿素。通过红外光谱对膜的结构进行表征和分析,研究改性淀粉膜的形成条件和影响因素。[结果]制备玉米淀粉基缓释膜的最佳反应条件是淀粉和PVA的质量比为1∶1,PVA的含量为15%,吐温0.2 ml,尿素0.5 g,丙三醇1.5 g,甲醛2ml,硼砂0.2 g,引发剂用量0.5%,反应30 min,反应温度控制在80℃。[结论]制备得到的包膜材料具有成本低、可生物降解、无环境污染等特点。

[Objective]The research aimed to study the preparation and characterization of release film from corn starch.[Method]The coated fertilizer was prepared by coating material,which was synthesized by corn starch,polyvinyl alcohol（PVA） and additives.Effects of additives included in coating materials on the slow-release fertilizer were studied in detail.The construction of the membrane was analyzed and characterized by IR spectrum and TG.The effectible factors and optimum conditions of the membranes prepared were investigated.[Result]The best reaction condition of the preparation of release film from corn starch was as following：starch：PVA=1∶1,PVA content of 15%,tween of 0.2 ml,urea of 0.5 g,glycerin of 1.5 g,formaldehyde of 2 ml,borax of 0.2 g,evocator of 0.5%,reaction for 30 min,reaction temperature of 80 ℃.[Conclusion]The release film has characteristics of low cost,biodegradation,no pollution.