Preparation method of high-concentration sodium dodecyl benzene sulfonate solution

Abstract

The invention belongs to the technical field of surfactants, and particularly relates to a preparation method of a high-concentration sodium dodecyl benzene sulfonate solution. The preparation methodcomprises the following steps: uniformly mixing dodecylbenzene sulfonic acid and polyethylene glycol according to a weight ratio, cooling, and carrying out neutralization reaction with a sodium hydroxide solution until the pH value of the mixed solution is 6.5-7, thereby obtaining a yellow oily sodium dodecyl benzene sulfonate solution. The solubilizing stabilizer polyethylene glycol is added in the preparation process, so that the compatibility and stability of the whole oily system are greatly improved, the oily system is favorably used as an emulsifier and a wetting agent in the field of pesticides, the stability of a pesticide preparation formula is improved, and the polyethylene glycol is non-toxic and harmless, can be used for killing insects and mites, and also reduces the toxicityof the pesticides. The method is simple in preparation process, easy for industrial large-scale preparation, low in cost and simple to operate, the whole preparation process is environment-friendly and green, and no waste gas, waste liquid and waste residue are generated.

Description

technical field [0001] The invention belongs to the technical field of surfactants, in particular to a method for preparing a high-concentration sodium dodecylbenzenesulfonate solution. Background technique [0002] As an anionic surfactant, sodium dodecylbenzenesulfonate has good surface activity and strong hydrophilicity, which can effectively reduce the tension of the oil-water interface and achieve emulsification. Therefore, sodium dodecylbenzene sulfonate is widely used in the preparation of emulsions such as cosmetics, food, printing and dyeing auxiliaries, and pesticides. [0003] However, the common sodium dodecylbenzene sulfonate currently on the market mostly exists in the form of powder or a solution with a content lower than 30%, and the powdery sodium dodecylbenzene sulfonate is easy to layer and precipitate, resulting in easy emulsion Caking and precipitation, very unstable; solutions with a content lower than 30% are difficult to formulate and process in the ...

AI Technical Summary

Problems solved by technology

[0003] However, the common sodium dodecylbenzene sulfonate currently on the market mostly exists in the form of powder or a solution with a content lower than 30%, and the powdery sodium dodecylbenzene sulfonate is easy to layer and precipitate, resulting in easy emulsion Caking and precipitation, very unstable; solutions with a content lower than 30% are difficult to formulate and process in the emulsion preparation because the content is too low. According to the existing technology, when the concentration is higher than 30%, it becomes a white thick paste or The state of grease layering is not conducive to use in actual production