Characteristics of organic silicone surfactants-Iota

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News > Dynamic industry > Characteristics of organic silicone surfactants

Characteristics of organic silicone surfactants

Silicone surfactants for new pesticide adjuvants in the mid 60's, at the end of the 80'sbegan to commercialization. It has strong adhesion, wettability, good ductility, excellentair permeability and good anti rain erosion, obtained the rapid development in just a few decades.

1 good wetting ability of surfactants wetting depends largely on the between the droplet and the surface of the leaf contact angle. The spray liquid equilibrium surface tension, on the leaf surface contact angle or extension area and the spray solution chemical characteristics, morphological characteristics of the leaf surface. Although theconventional nonionic surfactants can increase the wettability of the liquid spray, but theycan not completely wet on the hydrophobic surface, which will make the absorption ofactive ingredients to reduce the anti rain effect. Silicone can reduce the surface tension of more than conventional surfactants, such as alkyl phenol ethoxylate and the basesurface active agent as more rapid effect. The general surfactant solution surface tensionwas 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 wetting rate, especially for hydrophobic surface has a direct relationship. The smaller the surface tension, wetting solid surfacewater solution faster, the wetting spreading area or larger area. The surface of plant stems, leaves, stems with a thin layer of hydrophobic wax emulsion, pesticide surfactantemulsion was applied to the plant stems, leaves, stems, slow wetting, the spreading areais small. Because the capillary effect, many of the small pore of pesticide penetration in,those who are not part of the pest pesticide wetting can still survive. Also need to go outthe weeds also be of no avail, because the herbicide cannot penetrate into the pores ofthe weeds. The addition of a small amount of silicone surfactant herbicide, herbicide dosage can be reduced more than 1/3. Because of the surface tension of organosilicon surfactant is very low, so it can promote the rapid penetration of pesticide emulsionwetting, each a small part of the plant stems, leaves, stems, pesticides play an important role to the maximum effect, and greatly prolong the time.

2 the ductility of the so-called super ductility refers to: a drop of reagent solution inhydrophobic surface (such as plant surface) extension unit is at least nine times thediameter of the same water. Policello. Georga. A put forward the surface activity of a 10 L of liquid drops in the poly ether agent layer, the extension of 30s in diameter. This property enables agents to achieve maximum coverage and attached to the leaf surface,and even can make the drug into the abaxial surface of leaves or fruit tree pests hiding in the gap, to achieve the effect of insecticide and fungicide, which greatly increased the efficacy of pesticides. Organic fluorine surfactant with silicone surfactants can effectively reduce the surface tension of the solution, but the ductility, silicone surfactantssignificantly better than organic fluorine surfactant.

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

Several hours to reach the maximum penetration; another is absorbed by plant stomata,unfortunately only a few special surfactant can be absorbed by this way. Silicone additives can reduce the surface tension, wetting the foliage below the critical pressure(about 25mN/m), so it can promote the physic liquor into the epidermis stomatal infiltration. Advantages of this approach is the absorption of fast absorption, which can reduce the rain erosion.a