Karbofos emulsion in water and preparation method thereof

Abstract

The invention discloses Karbofos emulsion in water, which comprises the following components in percentage by weight: 20 percent to 70 percent of karbofos active compound, 0 to 15 percent of organic solvent, 2 percent to 15 percent of emulsifying agent, 0.5 percent to 5 percent of antifreeze, 0 to 3 percent of thickening agent and the rest of water; the organic solvent is toluene, dimethylbenzene, benzene or C10 aromatic hydrocarbon, the thickening agent is aluminium-magnesium silicate, organobentonite, xanthan gum or carboxymethyl cellulose, the antifreeze is glycol, propanetriol, isopropanol or butanol, and a stabilizing agent is antioxidant 264, epoxy chloropropane, epoxidized soybean oil or benzoperoxide, the emulsifying agent is calcium dodecyl benzene sulfonate or K-12, alkyl naphthalene sulfonate, nonyl phenol polyoxyethylene ether, alkylaryl polyoxyethylene ether, polyoxyethylene fatty acid, PO-EO block polyether, polycarboxylate, polyoxyethylene hydrogenated castor oil and styryl phosphate. The emulsifying agent is more likely to be one or several of PO-EO block polyether, alkyl naphthalene sulfonate, nonyl phenyl polyoxyethylene ether, alkylaryl polyoxyetheylene ether, polyoxyethylene fatty acid and styryl phosphate mixed in any proportion. The Karbofos emulsion in water is a high-efficient, safe, economical, convenient and environment-friendly farm chemical.

Description

technical field [0001] The invention relates to the technical field of pesticides, in particular to a malathion emulsion in water (EW) and a preparation method thereof. Background technique [0002] Since Malathion was developed by American Cyanamid Corporation in 1950, it is still one of the most widely used organophosphorus insecticides in the world. Malathion is a low-toxicity insecticide with a short residual period, good contact and certain fumigation effects, and no systemic effect. Malathion is highly toxic to pests, and is mainly oxidized to malaoxon in the pests, and the anticholinesterase activity of the latter is enhanced by 1000 times. However, the toxicity of malathion to humans and animals is very low. The oral LD50 of rats is 1635-1752 mg / kg, and the dermal LD50 is 4000-6150 mg / kg. The reason is that malathion is phosphatase in mammals It is hydrolyzed under the action and loses its activity. However, due to the lack of this enzyme in insects, malathion and ...

AI Technical Summary

Problems solved by technology

[0004] At present, the formulations of malathion in the market are mainly traditional liquid emulsifiable concentrates, including 45% emulsifiable concentrates, 25% oil formulations, and 70% high-quality emulsifiable concentrates (anti-insect phosphorus), etc. When producing emulsifiable concentrates, a large amount of organic solvents must be added. Solvents are mainly benzene, which is flammable, explosive, harmful to humans and animals, and pollutes the environment. It is extremely unsafe in the process of production, storage, transportation, and use. Developed countries have banned or partially banned their use on fruit trees and vegetables.

In addition, it is also a waste of resources to spray a large amount of valuable chemical raw materials that have no drug effect into the field.