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农药的原药多呈块状或油状,没有分散性能,不能直接使用,必须根据原药的性质,防治对象和使用方法,配用适当的助剂,经过加工制成一定的剂型。农药的剂型就是农药的使用形态。一种农药剂型可包括多种制剂,常见的农药剂型有下面几种。1.粉剂:由原药和填料(以滑石粉最好)经过粉碎、混合制成的粉状机械混合物,细度为95％,能通过200目筛,粒径小于74微米。粉剂的有效含分通常在1～10％,特点是容重较小,流动性好,能形成宽阔的粉流;不能被水湿润,不能形成悬浮液。所以,粉剂(如2.5％敌百虫粉剂、
Most of the original pesticides were massive or oily, there is no dispersion performance, can not be used directly, must be based on the nature of the original drug, prevention and treatment of objects and methods of use, with appropriate additives, processed into a certain dosage form. Pesticide formulations is the use of pesticides. A pesticide dosage form can include a variety of formulations, there are several common pesticide formulations below. 1. Dusts: A powdered mechanical mixture made by pulverizing and mixing the original drug and filler (best with talcum powder) with a fineness of 95% and capable of passing through a 200 mesh sieve with a particle size of less than 74 microns. The effective content of powder is usually 1 ~ 10%, characterized by a smaller bulk density, good fluidity, can form a broad powder flow; can not be wet with water, can not form a suspension. Therefore, powder (such as 2.5% trichlorfon powder,