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It is well known that water-dispersible granules have been developed on the basis of wettable powders, and water-dispersible granules can be regarded as a substitute for wettable powders to some extent. There are certain differences in the processing technology between the two.
From the viewpoint of processing formula, the formulation of the wettable powder generally includes an active ingredient, a dispersing agent, a wetting agent and a filler, and the proportion of the filler is generally large. Since the water-dispersible granules require granulation, in addition to the processing aid of the wettable powder, the dispersible granules also require a binder, a wetting agent, a disintegrating agent and the like.
From the processing point of view, the processing of wettable powder is generally simple, such as mixing, dry crushing, metering and packaging. The water-dispersible granules are relatively complex in comparison and require mixing, pulverization, kneading, granulation, drying, sieving, and metering.
Product Features of Water Dispersible Granules
(1) There is no dust flying, which reduces the pollution to the environment, and is safe for operators. When high-toxic pesticides are processed into water-dispersible granules, the toxicity can be reduced;
(2) There is sufficient hardness and strength, and the control products produce excessive dust during packaging, storage and transportation;
(3) It has certain traits and fineness, and can be processed into different particle sizes in order to control the dispersion time of the particles;
(4) Good fluidity, no adhesion, no agglomeration, no sticking wall, and can be packed in paper bags to save costs;
(5) The apparent density is large, the packaging container is small, and it is convenient for packaging, storage and transportation, and can be metered, and the user is convenient to use;
(6) The particle has a high disintegration rate, can be rapidly disintegrated when poured into different water temperatures and hard water, and has good self-dispersibility; after the particles disintegrate in water, they quickly disperse into very small particles, and after disintegration and agitation , sieved by 325 mesh wet method, the residue on the sieve is not more than 0.3%;
(7) Excellent suspension property, generally no need to stir or a little stirring, that is, a uniform spray suspension is formed, and the suspension can reach 90% or even higher;
(8) The active ingredient content is higher than that of the wettable powder and the suspending agent;
(9) The storage stability and physical and chemical stability are good, especially for pesticides which are unstable in water, and the dosage form is better than the suspension agent;
(10) The suspension stability is good, the prepared liquid is not used up on the same day, and can be resuspended after stirring the next day, without affecting the efficacy;
(11) The dosage form has wide adaptability. For the following pesticides with low melting point, difficult pulverization, inconvenience to make wettable powder and poor stability in water and unable to be made into water suspension agent, the choice of water-dispersible granules has unique characteristics. Applicable value. And the water-dispersible granules have good matching to ultra-efficient pesticides;
(12) The processing technology is flexible and can be selective;
Of course, although the wettable powder is an older dosage form and is gradually replaced by new dosage forms such as water-dispersible granules or suspensions due to defects such as no dusting, etc., the wettable powder is not completely useless, in the processing of the product. The determination of the product dosage form in the process is closely related to the basic performance of the active ingredient, the method of use, the place of use, the method of application, etc., and needs to be comprehensively determined.
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