Recently, polymerized surfactants with relatively high molecular weight have been developed. The following three forms are more suitable for use in pesticides. The pesticide network is specially introduced for you:
1. Random polymeric surfactants These surfactants are formed by polymerizing poly(alkylene) glycols, polyhydric alcohols and aliphatic or aromatic polycarboxylic acids and their anhydrides to form a three-dimensional network structure. Polymeric surfactant. For example, Atlox 49.4 (HLB = 6), its hydrophilic action is provided by a number of ester or ether groups. Good stability of the O/W emulsion is obtained when it is used in combination with a high HLB value of the AB or ABA type copolymer.
2. Synthetic polymeric surfactants These are polymeric surfactants of ABA intercalated copolymers, typically in the form of EO-PO-EO intercalated copolymers, which are commonly used as emulsifiers and dispersants for pesticides. There are still some deficiencies in the use of water-based dosage forms, mainly from the adsorption surface and the solubility of the EO unit depends on the ionic strength and temperature of the medium; another disadvantage is that PO has a low hydrocarbon content. Solubility, especially in aliphatic hydrocarbons, but it is possible to adjust the intercalated copolymers with excellent properties by selecting different A and B. For example, Atlox4912, which is an ABA intercalation copolymer obtained by esterification of poly(12-hydroxystearic acid with poly(alkylene) glycol. This surfactant is very suitable as a pesticide emulsifier when it is A high HLB emulsifier can be used to stabilize the O/W emulsion. The lipophilic chain in this emulsion acts as an adsorption and enters the oil phase, while the hydrophilic high molecular weight polyethylene glycol provides water. The phase is stable, and it is determined that the oleophilic chain enters the oil several times more than the commonly used C18 sorbitan ester, that is, the adsorption capacity is stronger.
3. Comb-type graft polymerization surfactants These surfactants have a very high relative molecular mass with an average relative molecular mass between 20,000 and 30,000. It has a long oleophilic backbone as the backbone, ensuring strong adsorption on the surface of the particles without detachment and transfer; the hydrophilic chain attached to the main chain extends like a tooth into the water phase, ensuring unique steric hindrance effect. Taking the Atlox4913 comb-type graft copolymer as an example, it forms a main chain skeleton with a copolymer of polymethacrylic acid/methacrylic acid ester, plays an adsorption role, and extends into a lipophilic portion with a suitable length of polyoxyethylene chain. The aqueous phase acts as a barrier steric around the particles. The polymeric surfactant has a 10-fold greater adsorption capacity than conventional surfactants, and is hardly detached and transferred from the surface of the particles. It is used as a pesticide dispersant to improve the heat storage stability of the preparation, and can also be used to prepare high concentrations of pesticides . Water suspension.
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