The surfactant can be used as a pesticide preparation which can be used as a pesticide original which cannot be directly used. As a pesticide additive, it can be applied to pesticides, which not only can improve the use of pesticides, but also reduce the amount of pesticides, reduce the impact of pesticides on the environment, and bring huge benefits to agricultural production. However, since pesticides are a kind of special chemicals with extremely strong biological activity, their control objects, protection objects and environmental conditions are very complicated. In addition to the nature and characteristics of the original drugs, the surfactants in pesticides need to be formulated. Consider the effect of the surfactant itself on the target organism. led grow light,grow strip light,grow lighting Shenzhen You&My Electronic Technology Co., Ltd , https://www1.youmyledlight.com
1. Solubilizer The solubility of the poorly soluble drug in the solvent is significantly increased by the action of the micelle of the surfactant, which is solubilization. A surfactant of HLB = 15-18 can be used as a solubilizing agent, but it exhibits solubilization only when the concentration of the solubilizing agent is higher than the critical micelle concentration. At this time, the poorly soluble drug is occluded or adsorbed in the oleophilic group of the solubilizing agent, and the hydrophilic group of the solubilizing agent is in the water, so that the nonpolar drug is soluble in water.
2. Dispersant The dispersant can hinder or prevent the aggregation of solid or liquid particles in the dispersion system and keep it uniformly dispersed for a long period of time. The dispersant adsorbs at the oil-water interface or the surface of the solid particles, forming a charge or steric barrier around the particles, helping to prevent the pesticide particles from re-aggregating during conditioning and storage. As the dispersing agent, generally, an anionic surfactant having a polycyclic ring such as a sodium salt of an alkylnaphthalenesulfonate and a naphthalenesulfonic acid formaldehyde condensate, a lignosulfonate or the like is used. Polymer dispersants (such as sodium carboxylate) are particularly important in the preparation of aqueous suspensions because of their adsorption properties and the ability to charge dispersed particles with a large space barrier.
3, wetting agent Most organic synthetic raw drugs are sulfur-based, need to be used with water. Water-based preparations such as wettable powders, suspensions, water-dispersible granules and the like are required to be added with a wetting agent. Mainly used as a wetting agent are anionic surfactants (such as fatty alcohol sulfate, dodecylbenzenesulfonate, etc.) and nonionic (such as Pingpingjia, Nongshui 100#, Nongshui 600#, spit Warm, sorbitol polyoxyethylene ether, etc.). Certain natural products such as lignosulfonate, tea dry, saponin, etc. are also preferred wetting agents. Due to the action of the wetting agent, the drug dispersion can be increased, the stability of the preparation is increased, and the release, absorption and enhancement of the drug are also facilitated.
4. Emulsifier Most organic solutions of crude oil or pesticides are incompatible with water. Emulsifiers are one of the ingredients that are indispensable for the formulation of emulsions, microemulsions, emulsions, and the like. Surfactants used as emulsifiers are mainly nonionic and anionic mixtures, such as fatty alcohol polyoxyethylene ethers or mixtures of fatty acid polyoxyethylene esters and alkyl aryl sulfonates, and many commercially available emulsifiers According to the hydrophilicity and lipophilicity of the emulsified materials, the two types of emulsifiers are mixed in a certain proportion, and the agricultural milk 2201, agricultural milk 0203B and the like are added. This type of complex emulsifier not only has good emulsifying properties, but also the emulsion prepared by it is relatively stable. It is generally believed that this is because the drug molecules are solubilized in the micelles of the anionic surfactant to cause self-emulsification, and the nonionic surfactant is adsorbed around the organic solvent particles to stabilize the formed emulsion.
Surfactants in pesticides have other special effects in addition to the effects of general surfactant solubilization, wetting, dispersion, and emulsification.