以过硫酸钾为引发剂、N,N'-亚甲基双丙烯酰胺为交联剂,采用水溶液聚合法制备了羧甲基纤维素接枝丙烯酸/丙烯酰胺缓释肥包膜材料,对其吸水性及耐盐性进行了检测,并将其应用于包膜尿素缓释肥的制备.结果表明,在羧甲基纤维素与丙烯酸质量比为3:17、丙烯酰胺用量为12％时,所制备包膜材料在去离子水、自来水和0.4％盐水中的吸水率分别达到743 g.g-1、497 g·g-1和329 g·g-1;包膜尿素缓释肥的氮素释放率满足GB/T 23348- 2009要求,缓释周期达63 d.%Carboxymethyl cellulose graft acrylic acid/acrylamide was prepared by the method of graft copolymerization using potassium persulfate as initiator and N,N'-methylenebisacrylamide as crosslinking agent. The water absorption and salt tolerance of the coating material were determined,and it was applied to preparation of coated urea slow release fertilizer. When the mass ratio of carboxymethyl cellulose to acrylic acid was 3 : 17 and the amount of acrylamide was 12%,the water absorption rate of the coating material was 743 g · g-1,497 g · g-l ,329 g · g-1 in deionized water,tap water,and 0. 4% brine,respectively. The slow-release period of coated urea was 63 d with the nitrogen release rate meeting the standard GB/T-23348-2009.
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