What are the characteristics of organic silicone surfactants?-Iota

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News > Dynamic industry > What are the characteristics of organic silicone surfactants?

What are the characteristics of organic silicone surfactants?

Silicone surfactant used as a new type of pesticide adjuvant began in the mid 60's, the end of the beginning of the end of 80. It has good wettability, strong adhesion, excellent ductility, porosity, permeability and good resistance to rain erosion, in a short span of several decades has been rapid development.
1 the ability of a good wetting surface active agent is largely determined by the contact angle between the liquid drop and the leaf surface. The contact angle or the surface tension of the spray solution, the surface tension of the spray solution, the chemical characteristics of the leaf surface, and the morphological characteristics of the leaf surface. Although conventional nonionic surface active agent can increase the wettability of liquid spray, but they are not in the leaves of the hydrophobic complete wetting, which will will make active ingredient uptake reduce anti rain effect. Silicone is more rapid than conventional surfactants, and can be more rapidly than the surface active agent of alkyl phenol. The surface tension of the water solution of the surfactant solution is more than 30mN/m, and the surface tension of the aqueous solution of organic silicone surfactants is about 20mN/m. The surface tension of aqueous solution is directly related to the wetting ability of water solution on the solid surface, especially the hydrophobic surface. The smaller the surface tension, wetting solid surface water solution faster, wetting spreading area or a larger area. Plant stems and leaves, stem surface has a layer of very thin hydrophobic wax and surfactant emulsion pesticide emulsion were applied to plant stems, leaves, stems, slow wetting and spreading area small. Due to the capillary effect, many of the small pore of pesticide infiltration into and those who are not pests pesticides wetted parts can still survive. The same need for out weeds can also be of no avail, because the herbicide cannot penetrate into the pores of weeds. A small amount of organic silicon surface active agent is added to the herbicide, which can reduce the dosage of the herbicide by more than 1/3. Because the silicone surface active agent of surface tension is very low, so it can promote rapid pesticide emulsion wetting and penetration into the plant stems, leaves and stems of each a small part, the role of pesticides to maximize effectiveness and action time is greatly prolonged.
2 Super ductility refers to: a drop of reagent in the hydrophobic surface (such as the plant surface) unit diameter of the extension is at least nine times in the same situation. A Policello. Georga. proposed to a 10 microliters surfactant liquid drops in poly ether layer, in 30 seconds after testing to extend its diameter. This nature can make potions in foliar above reached maximum coverage and attachment, even can also enable agents to enter to the abaxial surface of leaves or fruit slot hiding pests, achieve pesticidal and bactericidal effect, so as to greatly increase the efficacy of pesticides. Organic fluorine surface active agent and silicone surfactants as can effectively reduce the surface tension of the solution, but in terms of ductility, organosilicon surfactant very earth is better than organic fluorine surface active agent.
3 there are two ways in the absorption of the air permeability and anti rain erosion. One is absorbed through the skin, which is very slow and sometimes need to be.
For several hours to reach the maximum penetration; the other is absorbed by the plant stomata, but only a small amount of special surfactants can be absorbed in this way. Silicone additives can reduce the surface tension, so that less than the surface of the critical pressure (about 25mN/m), so can promote the penetration of liquid into the skin by the pores. The advantage of this approach is that it absorbs quickly, and thus can reduce the erosion of rain.

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