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    • 25. 发明授权
    • Coated granular fertilizer and method for producing same
    • 涂层颗粒肥料及其制备方法
    • US06322606B1
    • 2001-11-27
    • US09665123
    • 2000-09-20
    • Haruhiko KomoriyaKazuhiko MaedaMasayuki ShiotaYoshi HirashimaKentaro TsutsumiMikio OotaniYukio Ikeda
    • Haruhiko KomoriyaKazuhiko MaedaMasayuki ShiotaYoshi HirashimaKentaro TsutsumiMikio OotaniYukio Ikeda
    • C05G500
    • C08G18/36C05G3/0029C08G18/5021C08G18/8051
    • The invention relates to a coated granular fertilizer having a film covering fertilizer granules. This film comprises a polyurethane resin prepared by a method comprising the steps of (a) reacting an aromatic polyisocyanate with a first polyol component (i.e., castor oil or a castor oil derivative), thereby to obtain a prepolymer having terminal isocyanate groups in the molecule; and (b) reacting the prepolymer with a second polyol component (i.e., castor oil or a castor oil derivative) and a third polyol component which is an amine having at least two hydroxyl groups in the molecule, thereby to cure the prepolymer and thus to prepare the polyurethane resin. The invention relates to another coated granular fertilizer having a film covering fertilizer granules. This film comprises a urethane resin and aqueous-fluid-absorbing particles having a particle diameter of from 1 to 200 &mgr;m. This urethane resin may be the above polyurethane resin. This coated granular fertilizer can be produced by a method comprising the steps of (a) applying an aromatic polyisocyanate, a polyol component (i.e., castor oil or a castor oil derivative), an amine, and the aqueous-fluid-absorbing particles, at the same time or separately in no special order, while the fertilizer granules are kept fluidized or rolled, thereby to form a precursory film on the fertilizer granules; and (b) curing the precursory film into the film. Each coated granular fertilizer is substantially superior in regulation of the release of plant nutrient elements therefrom.
    • 本发明涉及具有覆盖肥料颗粒的薄膜的涂覆颗粒肥料。 该膜包括通过包括以下步骤的方法制备的聚氨酯树脂:(a)使芳族多异氰酸酯与第一多元醇组分(即蓖麻油或蓖麻油衍生物)反应,由此得到分子中具有末端异氰酸酯基团的预聚物 ; 和(b)使预聚物与第二多元醇组分(即蓖麻油或蓖麻油衍生物)和第三多元醇组分反应,所述第三多元醇组分是分子中具有至少两个羟基的胺,从而固化预聚物,从而使 制备聚氨酯树脂。 本发明涉及具有覆盖肥料颗粒的膜的另一种涂覆颗粒肥料。 该膜包含聚氨酯树脂和粒径为1〜200μm的水溶液吸收性粒子。 该聚氨酯树脂可以是上述聚氨酯树脂。 该涂覆的颗粒肥料可以通过以下方法制备:(a)将芳族多异氰酸酯,多元醇组分(即蓖麻油或蓖麻油衍生物),胺和水性流体吸收颗粒施用于 同时或以特殊顺序分开,同时将肥料颗粒保持流化或滚动,从而在肥料颗粒上形成前体膜; 和(b)将前体膜固化成膜。 每个涂覆的颗粒肥料在调节植物营养元素的释放方面基本上都是优异的。