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    • 1. 发明申请
    • GRANULAR SLOW-RELEASE NITROGENOUS FERTILIZER
    • 颗粒缓慢释放氮肥
    • US20090165515A1
    • 2009-07-02
    • US12334668
    • 2008-12-15
    • Hiroshi AokiTakahiro WatanukiKiyoshi Tsuji
    • Hiroshi AokiTakahiro WatanukiKiyoshi Tsuji
    • C05C9/02
    • C05C9/02C05G3/0047Y02P60/212
    • A granular slow-release nitrogenous fertilizer which is less in the release velocity of a nitrogen component than a conventional granular slow-release nitrogenous fertilizer and which is excellent in long-term persistence and the sustained releasability of the nitrogen component. The granular slow-release nitrogenous fertilizer is prepared by granulating a mixture of a urea-aldehyde condensate and an oxidized wax. The content of the oxidized wax is preferably three to 25 weight percent and more preferably five to 15 weight percent. The oxidized wax contains polar groups and therefore has extremely excellent compatibility with the urea-aldehyde condensate. Therefore, the urea-aldehyde condensate, which is sparingly soluble, is extremely uniformly dispersed in the granular slow-release nitrogenous fertilizer according to the present invention; hence, the release velocity of the urea-aldehyde condensate into soil is low.
    • 与常规颗粒缓释氮肥相比,氮组分的释放速度小的颗粒状缓释氮肥,其长期持久性和氮成分的持续释放性优异。 粒状缓释氮肥通过将脲醛缩合物和氧化蜡的混合物制粒而制备。 氧化蜡的含量优选为3〜25重量%,更优选为5〜15重量%。 氧化蜡含有极性基团,因此与脲醛缩合物具有极好的相容性。 因此,本发明的颗粒状缓释氮肥中,极易溶解的脲醛缩合物非常均匀地分散, 因此,尿素 - 醛缩合物的释放速度低于土壤。