Method for preparing 4-vinyl benzyl surface-active macromonomer

Abstract

The invention discloses a method for preparing a 4-vinyl benzyl surface-active macromonomer, which is characterized by comprising the following steps: adding 20 portions of alkylphenol polyoxyethylene ether (CmH2m+1-C6H4-O-(CH2CH2O)nH, n is equal to 1 to 60, and m is equal to 1 to 20), 10 to 900 portions of solvent and 0.1 to 15 portions of catalyst into a three-mouth reaction flask with a reflux condensation device, and reacting for 1 hour under stirring at the room temperature; increasing temperature to 30 to 90 DEG C, adding 0.5 to 25 portions of 4-vinyl benzyl chloride into the reaction product, and continuously reacting for 6 to 48 hours; distilling the reaction product under reduced pressure to remove the solvent so as to obtain a crude product; and performing silica gel column chromatographic separation to obtain 4-vinyl benzyl alkylphenol polyoxyethylene ether with the yield of 62 to 94 percent. The 4-vinyl benzyl alkylphenol polyoxyethylene ether has excellent surface activity, and can be directly used as a surfactant. A water-soluble copolymer synthesized by taking the 4-vinyl benzyl alkylphenol polyoxyethylene ether as a surface-active macromonomer has the function of tackifying, or reducing solution surface tension and water-oil interfacial tension, and can be taken as a tackifying copolymer or a macromolecular surfactant for improving the oil recovery ratio.

Description

1. Technical field [0001] The invention relates to a preparation method of a 4-vinylbenzyl type surface active macromonomer, which is used for synthesizing comb-shaped water-soluble viscosity-increasing copolymers and polymer surfactants, and can also be directly used as surface active agent, belonging to the fields of organic chemistry, polymer materials and enhanced oil recovery. 2. Technical Background [0002] The relatively successful polymer flooding in my country and its chemical flooding enhanced oil recovery technology with surfactants and alkali binary or triple compound flooding have entered the world's leading level, but at present this technology is only suitable for high permeability, High-quality Class I and II reserves are difficult to apply to Class III and IV reservoirs with high temperature, high salt, low permeability, heavy oil, strong heterogeneity and large reserves. Nowadays, for medium and low permeability oil layers, my country mainly adopts seconda...

AI Technical Summary

Problems solved by technology

Although these monomers have good reactivity and surface activity, they are easily hydrolyzed in high temperature and acidic and alkaline media, so that the polymer loses its surface activity and viscosity-enhancing functions.