[Supply of stearyl alcohol] Method for preparing stearyl alcohol polyoxyethylene ether using stearyl alcohol

It is understood that stearyl alcohol appears as a white flake or granular solid, has a fragrance, is insoluble in water, and is soluble in ethanol, ether, benzene, and chloroform. It can be obtained by hydrolysis of pilot whale oil, hydrogenation of stearic acid under the catalysis of copper chromate, or reduction of ethyl stearate with saturated ethanol. It can also be obtained by controlling the polymerization reaction of ethylene under the action of alkyl aluminum, and then obtain the heptadecene fraction through oxo synthesis. Stearyl alcohol is widely used in daily chemicals, textiles, printing and dyeing and other industries. It is a raw material for manufacturing surfactants, emulsifiers and various additives.

Stearyl alcohol polyoxyethylene ether is a good dye leveling agent, with excellent emulsification and leveling properties, good warm viscosity and biodegradability. The product is nonionic in alkaline and neutral media, and cationic in acidic media. It can be used as a leveling agent for acidic complex dyes to reduce the amount of sulfuric acid used in the dye bath and reduce strong damage to fabrics. It can also be used as a leveling agent for neutral dyes and vat dyes, and as a stripping agent for wool and nylon fabrics.

The method for preparing stearyl polyoxyethylene ether from stearyl alcohol is as follows:

Using stearyl alcohol and ethylene oxide as raw materials, in the catalyst It is prepared by polymerization reaction in the presence of; the weight ratio of stearyl alcohol and ethylene oxide is 1:0.145~3.05; the catalyst is any one of solid sodium methoxide, sodium methoxide methanol solution, KOH, NaOH, etc. Or a mixture of more than one, the addition amount is 0.05~0.6% of the weight percentage of the prepared stearyl polyoxyethylene ether. The above method reasonably determines the raw material ratio, catalyst dosage, polymerization reaction temperature, time and other process parameters and conditions. The reaction conditions are mild, easy to control, and have low equipment requirements. The obtained stearyl polyoxyethylene ether has light color and stable performance. The adjustable molecular weight range is large, and the dye leveling agent product with the required performance can be obtained by adjusting the molecular weight, which can meet the needs of various occasions.