What are agricultrual chemicals and why should use?

Agricultrual chemicals are auxiliary substances added to the processing or use of pesticide preparations and used to improve the physical and chemical properties of pharmaceuticals, also known as pesticide adjuvants. The auxiliaries themselves are essentially free of biological activity, but can affect the control effect. With the wide use and development of pesticide additives, its variety is also increasing, so the choice of such additives has become the second biggest choice for farmers to choose pesticides.

1. Auxiliary agent to help disperse the original drug

Filler and carrier

A solid inert mineral, plant or synthetic material added to a solid pesticide formulation for the purpose of adjusting the finished product content or improving the physical state. The filler is used to dilute the original drug to increase the dispersibility of the original drug, and the carrier also has the function of adsorbing or carrying the active ingredient. Commonly used are clay, diatomaceous earth, kaolin, clay and so on.

Neutral inorganic substances such as clay, clay, kaolin, diatomaceous earth, pyrophyllite, talcum powder, etc. are generally used. Its role is to dilute the original drug, and the second is to adsorb the original drug. Mainly used in the production of powders, wettable powders, granules, water-dispersible granules, etc. Nowadays, the hot drug fertilizer is to use fertilizer as a carrier of pesticides, so that medicine and fertilizer can be combined into one, and the integration of medicine and fertilizer can be achieved.

Solvent

An organic substance used to dissolve and dilute the active ingredients of pesticides, making them easy to process and use. Commonly used are xylene, toluene, benzene, methanol, petroleum ether and the like. Mostly used to process emulsifiable concentrates. It requires strong solvency, low toxicity, high flash point, non-flammability, low cost and wide source.

Emulsifier

Dispersing one of the two incompatible liquids (such as oil and water) in a very small liquid droplet in a liquid phase to form an opaque or translucent emulsion. Surfactants are called emulsifiers. Commonly used are: such as polyoxyethylene esters or ethers (castor oil polyoxyethyl ether, alkyl phenyl polyethyl ether, etc.), Turkish red oil, diglycerin sodium laurate and the like. Used for processing emulsifiable concentrates, water emulsions and microemulsions.

Dispersant 

In the processing of the pesticide preparation, the solid particles in the solid-liquid dispersion system can be prevented from agglomerating, so that the surfactant is uniformly dispersed in the liquid for a long time. Such as sodium lignosulfonate, NNO and so on. Mainly used in the processing of wettable powders, water-dispersible granules and water suspension agents.

2. Auxiliary agents that help to exert drug efficacy or prolong drug efficacy

Synergist

A compound that has no biological activity, but can inhibit detoxification enzymes in living organisms, and can greatly improve the virulence and efficacy of pesticides when mixed with certain pesticides. Such as synergistic phosphorus, synergistic ether and so on. It is of great significance for controlling resistant pests, delaying drug resistance and improving control effects.

Stabilizer

Improve the stability of pesticides, according to the nature of the action can be divided into two, one is a physical stabilizer, improve the physical stability of the preparation, such as anti-caking agents and anti-settling agents. The other is a chemical stabilizer that inhibits or slows down the decomposition of active ingredients of pesticides, such as antioxidants and photo-degradants.

Sustained release agent

The effect of the sustained release agent is mainly to prolong the duration of the pesticide, and the mechanism of action of the slow release fertilizer is the same. In a suitable time, the agent is slowly released and exerts its efficacy. There are two kinds of sustained release agents, one is through physical means such as embedding, masking, adsorption, etc., and the other is through the chemical reaction between the pesticide and the sustained release agent.

3, enhance the penetration of pharmaceutical agents and exhibiting additives

Wetting agent

Also known as wet spread agents, are a class of surfactants that significantly reduce the surface tension of the solution, increase the contact of the liquid with the solid surface, or increase the wetting and spreading of the solid surface. Quickly moisturize the drug particles, enhance the ability of the drug solution to wet and spread on the surface of plants or pests, increase the uniformity of the drug, improve the efficacy of the drug, and reduce the risk of drug damage. Such as lignosulfonate, saponin, sodium lauryl sulfate, pull-open powder, polyoxyethylene alkyl aryl ether, polyoxyethylene alkyl ether and the like. It is mainly used for the processing of wettable powders, water-dispersible granules, liquid preparations and aqueous suspensions and as a spray aid.

Penetrant

A surfactant capable of promoting the entry of active ingredients of pesticides into plants and harmful organisms, and is generally used for formulating products of hypertonic pesticide preparations. Such as penetrant T, fatty alcohol polyoxyethylene ether and the like.

Adhesives can increase the adhesion of pesticides to solid surfaces. Make the agent more resistant to rain and improve the effectiveness of the pesticide. For example, adding a proper amount of mineral oil with a large amount of viscosity to the powder, and adding an appropriate amount of starch paste, gelatin, etc. to the liquid pesticide.

4. Additives to improve safety

Anti-drift agent

The role of the anti-drift agent is to prevent and mitigate the hazards caused by the drift of the drug in the use and processing of the pesticide. Mainly divided into two categories, one is anti-transpiration, the role is to slow down the vaporization, inhibit transpiration, prevent the droplets from rapidly becoming fine and drift, such as fatty acid alkyl ammonium salts, sodium polyacrylate and so on. One is to adjust the viscosity, the effect is to increase the viscosity of the spray, appropriately increase the size of the droplets, and reduce fine droplets, such as polysaccharide gum, alginate derivatives, hydroxyethyl cellulose, sodium polyacrylate, polyacrylamide, etc. .

Antifoaming agent (antifoaming agent)

As the name implies, it is to inhibit the foam generation or eliminate the auxiliaries that have already produced foam in the product, such as emulsified silicone oil, high-carbon alcohol fatty acid ester complex, polyoxyethylene polyoxypropylene pentaerythritol ether, polyoxyethylene polyoxypropylene alcohol ether, polyoxygen. Acrylglycerol ether, polydimethylsiloxane, and the like.

In addition, there are additives such as foaming agents, antifreeze agents, preservatives, and warning colors, which are not introduced here.

Generally speaking, the pesticide adjuvant itself is not biologically active, that is to say, it has no bactericidal and insecticidal effects, but whether the auxiliary agent is used or not has a great influence on the efficacy of the pesticide. For example, in the same amount of use, the 10% enemy grass killing effect of adding diesel fuel is completely comparable to the 20% enemy of diesel fuel, the dosage can be saved by 1 time, and it is safer for plants and humans.

Finally, let's say that the reduction and increase of pesticides is absolutely inseparable from additives!