[ 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.%[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.通过红外光谱时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.
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