Pesticide auxiliaries are auxiliary substances added during the processing or use of pesticide preparations to improve the physical and chemical properties of the pesticide. They are also called pesticide auxiliaries. The additive itself has basically no biological activity, but it can affect the control effect. There are many varieties of pesticides with different physical and chemical properties and different dosage form processing requirements, so they require different additives.
1. Filler or carrier
Fillers can be used to dilute the original pesticide, reduce the dosage of the original drug, facilitate the mechanical crushing of the original drug, and increase the dispersibility of the original drug. It is a filling material for manufacturing powders or wettable powders. When processing solid pesticide preparations, it is used to adjust Solid inert minerals, plants or synthetic substances added to the finished product or to improve the physical state. Commonly used ones include attapulgite, diatomaceous earth, kaolin, clay, etc. Its function is to dilute the original drug and adsorb the original drug. Mainly used to make powders, wettable powders, granules, water-dispersible granules, etc.
2. Solvent
Organic substances used to dissolve and dilute the active ingredients of pesticides to make them easier to process and use. Commonly used ones include xylene, toluene, benzene, etc. Mostly used for processing emulsifiable butter. It requires strong dissolving power, low toxicity, high flash point, non-flammability, low cost and wide source.
3. Emulsifier
For two-phase liquids (such as oil and water) that are originally incompatible, one phase liquid can be stably dispersed in the other phase liquid with very small droplets, forming an opaque or translucent emulsion. Surfactants that act this way are called emulsifiers. Such as calcium dodecyl benzene sulfonate. It is mostly used for processing emulsifiable concentrates, water emulsions and microemulsions.
4. Wetting agent
Also known as wetting spreading agent, it is a type of surfactant that can significantly reduce the interfacial tension between liquid and solid, increase the contact of liquid with solid surface, or increase the wetting and spreading of solid surface. Wetting agents are additives that can reduce the surface tension of water and make it easier for water to wet the solid surface. When the medicinal liquid is sprayed onto the surface of the subject, it is easy to spread wetly on the surface of the subject, improving the control effect, such as tea leaves, saponins, sodium lauryl sulfate, open powder, etc. Mainly used in the processing of wettable powders, water-dispersible granules, aqueous agents and water suspensions and as spray additives.
5. Dispersant
Dispersants are divided into two types. One is pesticide stock solution dispersant, which is a substance with high viscosity. Through mechanical action, molten pesticides can be dispersed into colloidal granules, such as waste sticky honey concentrate. Pulp waste liquid concentrate; the other is a dispersant for pesticide preparations, which can prevent powder flocculation and enable powdery pesticides to be well dispersed when sprayed. During the processing of pesticide preparations, it is a surfactant that can prevent the aggregation of solid particles in solid-liquid dispersion systems and keep them uniformly dispersed in the liquid phase for a long time. Such as sodium lignosulfonate, NNO, etc. Mainly used for the processing of wettable powders, water-dispersible granules, and water suspensions.
6. Penetrant
Surfactant that can promote the active ingredients of pesticides to enter the treatment objects such as plants and harmful organisms. It is mostly used to prepare high-quality pesticides.�Pesticide preparation products. Such as penetrating agent T, fatty alcohol polyoxyethylene ether, etc.
7. Adhesive
An additive that can increase the adhesion of pesticides to solid surfaces. Due to the improved adhesiveness of the agent, it is resistant to rainwater washing and improves its long-lasting effect. For example, add an appropriate amount of mineral oil with high viscosity to the powder, and add an appropriate amount of starch paste, gelatin, etc. to the liquid pesticide.
8. Stabilizer
Divided into two categories: one can inhibit or slow down the decomposition of active ingredients of pesticides, such as antioxidants, anti-photolysis agents, etc.; the other can improve the physical stability of preparations, such as anti-caking agents and anti-sedimentation agents.
9. Synergist
It is a compound that has no biological activity in itself, but can inhibit detoxification enzymes in organisms. When mixed with certain pesticides, it can greatly increase the toxicity and efficacy of pesticides. Such as synergized phosphorus, synergized ether, etc. It is of great significance for preventing and treating resistant pests, delaying insecticide resistance and improving control efficiency.
10. Safety agent
Compounds that reduce or eliminate herbicide damage to crops can improve the safety of herbicide use.
In addition, there are additives such as foaming agents, defoaming agents, antifreezes, preservatives and warning colors. Generally speaking, pesticide auxiliaries themselves have no biological activity, but the selection of auxiliaries has a great impact on the efficacy of pesticide preparations. For example, a mixed emulsifiable concentrate containing 10% propanil and 30% diesel has a similar herbicidal effect to a 20% propanil emulsifiable concentrate without diesel, but the dosage of propanil is 1 times different; when using Bordeaux mixture, if 0.2 is added to it %-0.3% bone glue, which can resist rain erosion and improve disease prevention effect. The rational use of pesticide auxiliaries can often improve the safety of pesticides on plants and reduce their toxicity to humans and animals.
