Pesticide auxiliaries are auxiliary substances added in the processing or use of pesticide preparations to improve the physicochemical properties of pharmacochemicals, also known as pesticide auxiliaries. The additive itself is basically inactive, but it can affect the control effect. There are many varieties of pesticides, different physical and chemical properties, different dosage form processing requirements, so the additives required are also different.
Filler or carrier
Solid inert minerals, plants or synthetic substances formulated to adjust the content of the finished product or improve the physical state during the processing of solid pesticide preparations. Commonly used are attapulgite, diatomaceous earth, kaolin, clay and so on. Its role is to dilute the original drug, and the second is to adsorb the original drug. It is mainly used to make powders, wettable powders, granules, water-dispersible granules, etc.
solvent
Used to dissolve and dilute pesticide active ingredients, making them easy to process and use organic matter. Commonly used are xylene, toluene, benzene and so on. Mostly used for processing emulsion. It requires strong solubility, low toxicity, high flash point, non-flammability, low cost and wide source.
Emulsifier
For the original incompatible two-phase liquid (such as oil and water), can be one of the liquids in a very small liquid stable dispersion in the other phase liquid, the formation of opaque or translucent emulsion, the surfactant that plays this role is called an emulsifier. Such as calcium dodecylbenzenesulfonate. It is mostly used in the processing of emulsions, water emulsions and microemulsions.
Wetting agent
Also known as wet spreading agent, is a type of surfactant that significantly reduces the tension of the liquid-solid interface, increases the contact of the liquid to the solid surface, or increases the wetting and spreading of the solid surface. Such as soap horn, sodium lauryl sulfate, pulling powder and so on. It is mainly used for the processing of wettable powders, water dispersible granules, water agents and water suspension agents, as well as as spray additives.
Dispersant
In the processing of pesticide preparations, it can prevent the accumulation of solid particles in the solid-liquid dispersion system, so that it remains uniformly dispersed in the liquid phase for a long time. Such as sodium lignosulfonate, NNO and so on. Mainly used for the processing of wettable powders, water dispersible granules and water suspension agents.
Penetrant
Surfactants that can promote the entry of pesticide active ingredients into the interior of treatment objects such as plants and pests, and are mostly used to prepare high-permeability pesticide preparation products. Such as penetrant T, fatty alcohol polyoxyethylene ether and the like.
Adhesive
Additive that increases pesticide adhesion to solid surfaces. It is resistant to rain-fed flushing due to improved adhesion of the agent and improves the effectiveness. For example, add an appropriate amount of mineral oil with a large viscosity to the powder, and add an appropriate amount of starch paste, gelatin and so on to the liquid pesticide.
Stabilizer
There are two categories: one can inhibit or slow down the decomposition of pesticide active ingredients, such as antioxidants, anti-photolytics, etc.; the other can improve the physical stability of the preparation, such as anti-caking agents and anti-sedimentants.
Synergist
It is a compound that has no biological activity itself, but can inhibit the detoxification enzymes in the organism, and when mixed with certain pesticides, it can greatly improve the toxicity and efficacy of pesticides. Such as synergistic phosphorus, synergistic ethers and the like. It is of great significance for the control of resistant pests, the delay of drug resistance and the improvement of prevention and efficacy.
Safety agent
Compounds that reduce or eliminate the harm of herbicides to crops can improve the safety of herbicides when used.
In addition, there are additives such as blowing agents, defoamers, antifreeze agents, preservatives, and warning colors.
Pesticide spray additives are divided into two categories
First, active additives, which include surfactants, wetting agents, oil-based, adhesives and penetrating agents.
Second, special-purpose spray additives, which include buffers or acidulants or PH value changers, water quality regulators, anti-drift agents, thickeners, admixtures.
Correct selection and use of pesticide spray additives
1, choose the agricultural spray auxiliaries specially developed for agricultural forestry, such as agricultural silicone auxiliaries, do not use industrial products or household detergents, laundry detergents, so as not to destroy pesticide activity.
2, many pesticide dosage forms already contain the necessary additives to improve the performance of pesticides, and generally do not use spray additives.
3, be sure that the spray additive to be used has done a complete efficacy test, and the products that are in doubt or uncertain should be tested in a small range and then used in a large area.
4, specific pesticides need specific additives, and the auxiliaries should be selected correctly when using them.
5, the recommended pesticide additives may change due to changes in dosage form, or changes due to changes in the technical procedures for administration.
6, Pesticide spray additives are not required under any spray conditions. A liquid impregnation test can be performed to test whether the spray contains an excess wetting agent.
7, do a good job of pesticide mixing and preparation safety, compatibility and effectiveness records, including pesticide dosage forms, spray auxiliaries, dosages, etc. Improper or excessive use of spray aids may cause reduced efficacy or cause harm. Carefully read the labels of pesticides and auxiliaries to ensure that the selected additives match the place of application, target pests, medicinal devices, and more importantly, the pesticides used.