高吸水性树脂(简称吸水剂),它属于一种新型的功能高分子材料,是七十年代中期由美国农业部北部研究中心首先开发的,由于它可以吸收与保持相当于自身重量数百到数千倍的去离子水,不仅在吸水性生理用品、医疗卫生用品和工业增稠剂及脱水剂方面得到了广泛的应用,而且在农林业上的应用也得到了开发,例如应用在种子造粒、种子涂层、树木移栽、农林、园艺等方面也取得了良好的效果。在不到十年的时间里已由原来开发的淀粉接枝聚丙烯腈水解共聚体的一个品种发展到了改性聚乙烯 It is a new type of functional polymer material developed by the USDA Northern Research Center in the mid-seventies. Because it absorbs and maintains a weight equivalent to hundreds of its own weight, Thousands of times of deionized water has been widely used not only in water-absorbing physiology, medical and hygiene products, industrial thickeners and dehydrating agents, but also in agriculture and forestry, for example, in seeds Granules, seed coating, transplanting of trees, agriculture and forestry, horticulture and other aspects have also achieved good results. In less than a decade, a variety of starch-grafted polyacrylonitrile hydrolysis interpolymers developed from the original to modified polyethylene