The hyperosmotic adjuvants are non-ionic, anionic and anionic and non-ionic mixed types are more commonly used, they belong to the category of surfactants. Regardless of the use of any type of hypertonic agent, the common application features are: all have good wettability, spreadability, adhesion and strong penetration ability, and can be knocked down in the correct application. Fast speed, anti-rain erosion, significantly improve the efficacy, reduce the amount of pesticides, reduce the cost of preparations, reduce environmental pollution and reduce the resistance of agrochemical products to pests, and can improve the absorption of the drug's internal absorption of the plant. A common feature of hypertonic agents is that they all have different degrees of reduction of the surface tension of aqueous solutions (standard water surface tension is 72mN/m). Generally speaking, the surface tension of hypertonic agents is mostly below 40mN/m, while silicone helps. The surface tension of the agent is as low as 20.5 mN/m. The lower the surface tension value, the faster the product's expansion speed, but the quality of the hypertonic agent can not be defined by the expansion speed of the auxiliary agent. The expansion speed does not represent the speed of the penetration agent, and the quality of the hypertonic agent. The rational selection depends on the “wetting speed†and “permeation†speed values ​​of the hypertonic agent species. Therefore, the faster the wetting speed and penetration of the hypertonic agent, the more effective the hypertonic agent is. Well, the quality will be better. Although some of the hypertonic agents are of excellent quality, they are expensive, adding a large amount and excessively increasing the cost of the preparation, or being unstable due to the pH value being easily decomposed and degraded in the acid-base conditions, will be far away from the user. Therefore, the basis for selecting a high-efficiency and low-cost hyperosmotic agent with good stability is: Scientifically determine the time value of “wetting speed†and “permeation force†of different concentrations of hypertonic agent and the corresponding step and stability experiments. value. Only in this way can the true quality of the hypertonicity agent be identified and the selection of the corresponding hypertonic agent species be determined.
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