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 acrylate is a white waxy solid with no pungent odor. It is insoluble in water and soluble in low-polarity organic solvents. Its melting point is 31-32°C. It is used for active dilution in radiation curing systems. Agent and cross-linking agent, it can also be used as resin cross-linking agent, plastic and rubber modifier.
The method for preparing stearyl acrylate from stearyl alcohol is as follows:
In a three-necked flask equipped with a thermometer, stirrer, and reflux condenser, Add a certain amount of stearyl alcohol, solvent toluene and polymerization inhibitor p-phenol (add 0.3~0.8% stearyl alcohol mass inhibitor), heat to 60°C to completely dissolve, then add moles of stearyl alcohol in sequence Measure 1.2 to 1.5 times the amount of propane acid and 0.5 to 1.2% catalyst by stearyl alcohol, stir and mix, and heat the mixture to 60 to 120°C. First heat and reflux for about 3 hours, then install a water separator for dehydration. Water and toluene can azeotrope and be evaporated at the same time. After more water is separated, the temperature is raised to continue the reaction. When the amount of water released is equivalent to the theoretical value, the esterification reaction is considered to be basically completed. Unreacted acrylic acid and solvent were distilled off under reduced pressure. Then pour the product into a beaker, use 5% (mass fraction) NaOH aqueous solution to wash away the catalyst, hydroquinone and a small amount of acrylic acid, and then wash with water several times until neutral. Dry under vacuum at 40%C for 8 hours (the temperature should not be too high, otherwise the monomer will thermally self-polymerize) to obtain waxy solid octadecyl acrylate.
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