[Supply of stearyl alcohol] Steps for preparing maleic anhydride reactive emulsifier from 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.

Maleic anhydride emulsifier is a reactive emulsifier with excellent performance. It has moderate reactivity, is not easy to homopolymerize, and can maintain good stability when hydrolyzed under alkaline conditions. Compared with traditional emulsifiers, reactive emulsifiers not only have an emulsifying effect, but can also participate in reactions as monomers to form polymers, which are bonded to the surface of latex particles through covalent bonds, allowing the emulsifier molecules to be stored and used in the emulsion. Desorption will not occur when the emulsion is used, and the latex is relatively stable under various conditions, such as high shear stability, freeze-thaw stability, and electrolyte stability; there is almost no residual emulsifier in the water phase, which can avoid the generation of foam. , does not pollute the environment, and can also speed up the film formation speed; when the latex film is formed, the migration of the emulsifier is avoided, so that the mechanical properties, gloss, adhesion, water resistance, etc. of the film are greatly improved.

Preparation of maleic anhydride reactive emulsifier from stearyl alcohol:

It includes the following steps: first prepare epoxypropyltrimethylammonium chloride Intermediate: Mix epichlorohydrin and trimethylamine and react at 25-30°C for 4-5 hours to prepare epoxypropyltrimethylammonium chloride intermediate; prepare maleic anhydride stearyl ester intermediate body, mix maleic anhydride and stearyl alcohol, and react at 70-75°C for 3 to 4 hours to prepare a maleic anhydride stearyl alcohol ester intermediate; mix the maleic anhydride stearyl alcohol ester intermediate The temperature of the body is raised to 110~115°C, and the glycidyltrimethylammonium chloride intermediate is slowly added to the stearyl maleic anhydride intermediate. The addition time is controlled between 3 and 5 hours. After the addition is completed, the temperature begins to rise. When the material temperature reaches 120°C, the temperature is kept constant for 1 hour to obtain a maleic anhydride reactive emulsifier.