The N,N'-Methylenebisacrylamide was used as crosslinking agent and the potassium persulfate was used as initiator to copolymerization and cross -linking of collophanite, amylum and acrylate by using aqueous solution polymerization method to prepare a kind of coating material with water retention and phosphor containing for coating slow release urea fertilizer. When mass fraction of phosphorite was 14%, the water absorption amount of the coating material was 560 g/g for deionized water and 254 g/g for tap water, while the slow release period of coated urea was 65 d. Therefore, the coating material meets the technological standards of GB/T23348-2009.%采用水溶液聚合法,以N,N’-亚甲基双丙烯酰胺为交联剂,过硫酸钾为引发剂,使胶磷矿、淀粉与丙烯酸盐共聚交联,制备了一种兼具保水性的含磷缓释肥包膜材料并应用于包衣尿素缓释肥.磷矿质量分数为14％时,材料在去离子水、自来水中的吸水率分别为560 g/g、254 g/g,包衣尿素的缓释周期为65 d,符合GB/T23348-2009规定的缓释要求.
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