The type of preparation is called a dosage form. Commercial pesticides are sold to users in the form of a dosage form. The most commonly used dosage forms in China are emulsifiable concentrates, suspending agents, wettable powders, powders, granules, water agents, poison baits, mother liquors, and mother powders. However, do you really score the original medicine, powder, emulsifiable concentrate and suspending agent? Original drug The original drug of the pesticide is generally not directly usable and must be processed into various types of preparations before it can be used. Refers to the raw materials used in the production of various pesticide formulations, which are the active ingredients in pesticide formulations. Herbicide original drug, bactericide original drug, plant growth regulator original drug, pesticide original drug. The higher content of pesticides produced by chemical plants is generally the original drug. Most of the pesticides can not be used directly. It needs to be added with solvents and surfactants to prepare a preparation product. It can be used. The solid is called the original powder. crude. The basic components of commercial pesticides are: raw materials + fillers, solvents, spreading agents, wetting agents, emulsifiers and Other additives. powder A type of drug. One or more pharmaceutical agents and fillers (such as talc) and a small amount of auxiliary agents are mixed, pulverized and mixed to a certain fineness of the powdery preparation, which can be used as it is, or diluted with an appropriate amount of filler and some auxiliary agents. Effect It is especially suitable for areas with difficult water supply and prevention of outbreaks of pests and diseases. Generally not suitable for dilution with water, used for dusting and seed dressing. Higher concentrations can be used as poison baits and for treating soil. It is easy to manufacture and use. It is mixed and pulverized with a certain amount of the original drug and inert filler (talc, clay, kaolin, diatomaceous earth, acid white clay, etc.) to make the fineness of the powder reach a certain standard. The standard in China is that 95% of the particles can pass through a 200-mesh standard sieve, that is, the particle diameter is below 74 microns, and the average particle size is about 30 microns. The fineness of the powder is closely related to the efficacy. The powder with a particle size larger than 37 microns is inferior in efficacy, and the most effective powder diameter is below 20 microns. Therefore, the problem of powder processing quality is urgently solved in China. 2. Attention The dusting should be carried out when the leaves of the early and late crops are wet or dewed, because the deposition of the particles on the surface of the crop mainly depends on adhesion or electrostatic adsorption, but the adhesion is small, on the surface of the crop with water film. On the top, the adhesion of the powder particles is improved, and the control effect can be improved. 3. Advantages (1) Because of its convenient use and no need for water, the powder can be directly sprayed on crops with a simple duster, and is popular among the people in arid areas or areas with difficult mountain water resources. (2) High work efficiency, low adhesion on crops, less residue, and less phytotoxicity. (3) In addition to being directly used for dusting, it can also be used to control diseases, insects, grasses and rats by seed dressing, soil treatment, and preparation of poison bait granules. (4) The use of powder is a good method of application in greenhouses and greenhouses. It is used in the confined environment of greenhouses and greenhouses to control disease and insect pests. It can make full use of the movement ability and floating effect of fine powder in the air, so that the drug can be uniformly deposited on the front and back of the plant leaves, and the control effect can be improved. It will pollute the environment outside the shed. Shortcomings (1) When used, particles with a diameter of less than 10 microns are easily lost due to the influence of the surface airflow, which wastes the dose and causes environmental pollution and affects people's health. (2) When processing, there is a lot of dust, which has a great impact on the health of the operator. Emulsifiable oil In China, it is a dosage form with a larger dosage. The emulsifiable concentrate is dissolved in an organic solvent (toluene, xylene, etc.) in proportion, and a certain amount of an emulsifier for pesticides (such as an alkyl thioiodate and a nonionic emulsifier) ​​is added to prepare a transparent homogeneous liquid. Effect The active ingredient content is high, generally between 40% and 50%. The emulsifiable concentrate is easy to use, and can be used by diluting with water to form a certain proportion of the emulsion. Emulsifiers contain emulsifiers, which help the droplets to adhere and spread on crops, worms and germs. The application of the drug is better, the effect period is longer, and the drug effect is good. In addition to spraying with a sprayer, the emulsifiable concentrate can also be coated with stems, filled with leaves, seeded, soaked, and the like. 2. Attention Since the emulsifiable concentrate contains an organic solvent, it promotes the penetration of the pesticide into the epidermis of the plant and the skin of the animal, and is applied according to the use concentration specified in the instructions for use. The residual time of emulsifiable concentrate is long, especially when applied to vegetables and fruit trees. It is also necessary to strictly control the application time of the drug to avoid phytotoxicity and poisoning accidents. 3. Advantages Emulsifiable oil is one of the main dosage forms of pesticides. It has high active ingredients, and the droplets are on the surface of plant harmful organisms. It has good adhesion, is not easily leached by rainwater, and can penetrate into the weeds of pests and diseases, so the effect is good. The residual effect period is long, the use is convenient, and the storage period is relatively stable. Shortcomings (1) Emulsion formula is gradually being phased out Since aromatic hydrocarbon solvents have been classified as environmental monitoring substances, the emulsion formulation is facing a situation in which it is gradually being phased out and replaced by other dosage forms. If a pesticide is capable of being processed into a variety of dosage forms, other dosage forms that do not use or use less organic solvents should be used whenever possible. (2) High quality emulsifiable concentrate can be used to prepare high quality emulsion for spraying When the poor quality emulsifiable concentrate is added to water, it often fails to form a uniform emulsion, or oil slick or flocculation occurs, so stability is an important quality indicator. Stability includes three aspects of the thermal storage stability, low moisture stability and emulsion stability of the emulsifiable concentrate. Suspending agent Also known as plastic suspension, suspension agent with water dispersion medium, pesticide raw materials, additives, pesticide preparation by wet micro-grinding. It combines some of the characteristics of emulsifiable and wettable powders, without the flammability and phytotoxicity of organic solvents. The granule is a dosage form which is completely free of an organic solvent and is a good dosage form for processing a solid drug. Effect The suspension is generally a solid drug, which is prepared by using water as a medium, a surfactant such as a dispersing agent, a viscosity modifier, an antifreezing agent, etc., and is subjected to wet ultrafine pulverization, and has a viscous fluidity liquid state. The active ingredient particles of the suspending agent are very fine. Generally, the particles are 1-5 micrometers, and the surface adhered to the plant is relatively firm, and is resistant to rain and has high efficacy. Its performance is between the emulsifiable concentrate and the wettable powder. The dispersion of the pesticide is very high, and it is finer than the wettable powder, but thicker than the emulsion. 2. Attention The suspending agent is used in the same manner as the emulsifiable pesticide, and is processed into a spray liquid for spraying. 3. Advantages (1) It is suitable for various spraying methods, and can also be used for ultra-low volume spray, with good dispersibility and suspension in water. There is no dust flying during processing and production, which is safe for the operator and does not affect the environment. (2) The suspending agent has the advantages of both wettable powder and emulsifiable concentrate, and is convenient to use, and can be directly used or diluted and sprayed, and is not affected by water quality and water temperature. (3) Due to its small particle size, narrow distribution range, high suspension rate, large active surface, easy to make pesticides play a potent effect, the same control effect, the amount of suspension agent used for the original drug is small. Shortcomings There are some products with insufficient quality, which are easy to stratify and agglomerate during storage. When purchasing, it should be noted that any stratified or agglomerated, difficult to shake evenly, are inferior pesticides. Ningbo Kyson Cool Electronic Technology Co., Ltd. , https://www.kysoncool.com