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Mar 9, 2020
The use of silicone surfactants as pesticide auxiliaries began in the arsenic era of the 20th century. Its application in the national economy has been receiving attention from people, but it was not commercialized in agriculture until the 1980s. In order to eliminate toxic and environmentally harmful 2,4,5-tide, the New Zealand Forestry Research Institute started researching herbicide additives in 1980. Monsanto New Zealand first introduced the world's first silicone surfactant L-77 (also known as S] iwet M) to the market under the trade name Pulse in 1985. Extensive indoor biochemical and physiological tests and subsequent field tests have confirmed that L-77 is the best additive to control glyphosate, a herbicide for vitex. There have been many reviews so far about the characteristics of silicone surface stabilizers and their applications in pesticides. This article briefly introduces the chemical structure of silicone surfactants and their use in pesticides. Structure of 1 silicone surfactant
The organosilicon surface-active Vitex genus T-type structure for pesticide auxiliaries has a skeleton composed entirely of methylated siloxane, and one or more polyether segments are suspended from the skeleton. Its chemical structure is general formula (1):.
The hydrophobicity of the backbone is related to the flexural properties of the siloxane backbone, which makes contact of methyl groups at the interface. The hydrophobicity of methyl group is stronger than that of methylene group, and methylene group is the main part of the hydrophobic part of most commonly used nonionic hydrocarbon surfactants.
The hydrophilic portion of silicone surfactants is basically similar to most commonly used nonionic surfactants. It is a chain with a self-releasing distribution range consisting of multiple ethoxylate (EO) units. Its hydrophilicity can be alleviated by inserting a less polar isopropoxy (PO) unit. The total polarity of the surfactant can be adjusted by the proportion of dimethylsiloxane unit substitution.