The characteristic of silicone surfactant-Iota

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Service > The characteristic of silicone surfactant

The characteristic of silicone surfactant

Silicone surfactants used as novel pesticide additives began in the mid 60's, started the commercialization of late 80's.. It has strong adhesion, wettability, good ductility, excellent airpermeability and good anti rain erosion, has been rapid development in recent decades.

1 good wetting ability of surfactants wetting largely depends on droplet and the surface of the leafcontact angle. The spray liquid equilibrium surface tension, the surface of the leaf contact angle orextension area and spray solution chemical properties, surface morphology characteristics of theleaf. Although conventional nonionic surfactants can increase the wettability of the liquid spray, but they can not completely wetting in the hydrophobic surface, which will make the absorption of active ingredients to reduce the anti rain effect. Silicone can reduce the surface tension more thanconventional surfactants, such as alkyl phenol and ethoxylated surfactants as the base for more rapid action. The general surfactant solution surface tension in more than 30mN/m, and the surface tension of silicone surfactants in aqueous solution are about 20mN/m. The size of water solution and the surface tension of the aqueous solution on the solid surface wettability, especiallyhydrophobic surface wetting speed has a direct relationship. The smaller the surface tension,wetting solid surface water solution faster, wetting spreading area or a larger area. The surface ofplant stems, leaves, stems with a thin layer of hydrophobic wax, pesticide emulsion surfactantemulsion was applied to the plant stems, leaves, stems, slow wetting, the spreading area of small.Due to the capillary effect, the pore penetration into many tiny pesticides, those who are not part ofthe pest pesticide wetting 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. Adding a small amount of silicone surfactant herbicide formulations, the herbicide dosage is reduced by more than 1/3. Because the surface tension of the silicone surfactant is very low, so can promote the rapid penetration ofpesticide emulsion wetting, a small part of each of the plant stems and leaves, stems, the pesticideaction to maximize effectiveness, and greatly prolong the time.

2 super super ductility ductility refers to: a drop of liquid reagent in the hydrophobic surface (such as plant surface) the ductility of the unit diameter is at least nine times the same water. Policello.Georga. A put forward a 10 microliters of surface active agent liquid drops in poly ether layer, test the extension after 30s diameter. This property can make the agents achieve maximum coverageand attachment to the foliage above, can even make medicament into hiding pest leaves abaxiallyor fruit trees in the gap, achieve the insecticidal and bactericidal effect, which greatly increased the efficacy of pesticides. Organic fluorine surfactant with silicone surfactant can effectively reduce the surface tension of the solution, but the ductility, silicone surfactants significantly better than organicfluorine surfactant.

3 air permeability and anti rain erosion of pesticide absorption in general there are two ways: one isthrough the skin absorption, this way is quite slow, sometimes need to

Several hours to reach the maximum penetration; the other is absorbed through the stomata,unfortunately only a few special surfactants can be absorbed by this way. Silicone additives canreduce the surface tension, which is lower than the critical leaf wetting under pressure (about 25mN/m), so it can promote drug penetration into skin through stomata. The advantages of this way is the absorption of fast absorption, which can reduce the rain erosion.