Comprehensive analysis of wettable powders
The wettable powder is a kind of pesticide original drug, which belongs to an inert filler and a certain amount of auxiliary agent, and can have a certain particle size fineness after being thoroughly mixed and pulverized according to the ratio. I don't think everyone knows about wettable powders. Let's take a look at the pesticide network Xiaobian:
From the shape of the wettable powder, it is no different from the powder. Since it is added with a humectant, a dispersant and the like, it can be wetted, dispersed, and formed into a certain suspension after being added to water, and can be sprayed. Compared with emulsifiable concentrates, wettable powders have low production cost and can be packaged in paper bags or plastic bags. The storage and transportation are convenient and safe, and the packaging materials are easy to handle. Most importantly, the wettable powders do not use solvents and emulsifiers. It is extremely safe for plant growth, does not cause phytotoxicity to crops, and is safer for the environment. The use of wettable powder before bagging of fruit crops can avoid the stimulation of the fruit surface by organic solvents in time. The frequently used wettable powders are 10% imidacloprid powder, 25% chlorpyrifos, 70% methyl thiophanate powder, and the like.
According to the Chinese Pesticide Network , wettable powder has many advantages. The wettable powder is insoluble in water and can be processed into a wettable powder. It can be used in high concentration or spray, and processed into a wettable powder; wettable powder. It does not contain organic solvents, has good compatibility with the environment, and is convenient for storage and transportation. The wettable powder has strong adhesion and relatively low environmental pollution; the active ingredient content of the wettable powder is relatively higher than that of the powder. High, there will be some dust pollution during processing; the original drug of wettable powder is insoluble in common organic solvents or has less solubility.
Generally, the suspensibility of the wettable powder is more than 70%, and the suspension rate is high, indicating that the quality of the wettable powder is good; the product of the wettable powder is dissolved in water, the pH of the product is different, the pH of different products is different, and the general wettable powder is Neutral partial acidity is mostly, and strong alkalinity is mostly determined by the formulation and nature of the original drug. Generally, the moisture content of the wettable powder is generally less than 3%, and the low moisture indicates that the wettable powder is better. The quality problems of WPs commonly seen by agricultural personnel are generally low levitation rates. If a wettable powder is used, the wettable powder is added to water and stirred, and can be suspended in water without obvious precipitation, indicating that the quality of the wettable powder is good; on the contrary, the quality of the wettable powder is relatively poor, which may cause the spray of the sprayer to be blocked. At the same time, it may cause certain harm to crops. In order to increase the suspending rate of the wettable powder, additives such as a dispersing agent, a wetting agent, and a stabilizer such as an alkylnaphthalenesulfonate or sodium dodecylbenzenesulfonate are usually added.
The above is a comprehensive introduction to wettable powders, only a deep understanding of its pesticide properties can be more scientific and rational application, thereby improving the efficacy and improving safety.
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