Method for preparing alcohol ether type surfactant polyethylene monoester phthalic acid

Abstract

The invention discloses a preparation method of the alcohol ether type surface active agent, polyethylene glycol o-benzene dicarbonic acid monoester, which takes phthalic anhydride and polyethylene glycol as materials, and the reaction duration is three to five hours under the temperature of seventy five to 75-85 DEG C with the existing of acidic catalyst, the pH value is changed to one point five-three point five after neutralization by adding alkali, the molar ratio of phthalic anhydride and polyethylene glycol is one to zero point nine-one point one. The product is characterized by wide purposes by adopting the proposal, and has outstanding effects for improving the solubility of the water-solubility dyestuff. The invention has no need for filtration, so three wastes can be avoided, thus protecting the environment; because the reaction condition is mild, the invention can be produced by the general device without safe hidden troubles. When majority of water-solubility dyestuff fully dissolves, the solution can stand still for seventy two hours without precipitation under normal temperature and maintain the homogeneous state by adding the surface active agent.

Description

technical field [0001] The invention relates to a preparation method of a surfactant, more specifically a preparation method of an alcohol ether type surfactant polyethylene glycol phthalic acid monoester. Background technique [0002] Surfactant A surfactant is a compound with an amphiphilic structure that does not dissociate into an ionic state in water. Its hydrophilic group is composed of polyethylene glycol group, that is, polyoxyethylene group-(C2H4O)n. In addition, it is a structure based on polyols (glycerol, pentaerythritol; glucose, sorbitol, etc.), in addition to monoethanolamine. , Diethanolamine, etc.-based structure. Most nonionic surfactants are in liquid or slurry state, and their aqueous solution will appear cloud point phenomenon as the temperature rises. Because it cannot be dissociated into ions in aqueous solution, it has high stability, is not affected by acid-base salts, has strong resistance to hard water, and has good compatibility. It can be used ...

AI Technical Summary

Problems solved by technology

In the patent document (publication number: CN1180075) published on April 29, 1998 by the State Intellectual Property Office "A Preparation Method for Rosin Acid Polyethylene Glycol Resin", the preparation method is described: rosin or disproportionated rosin As a raw material and equimolar polyethylene glycol, use phosphorous acid as a catalyst to carry out esterification reaction at 200-300 °C, and the reaction time is 1-6 hours to prepare abietic acid polyethylene glycol ester nonionic surfactant. Its It has excellent viscosity-reducing properties of heavy oil, but the reaction temperature of this process is relatively high, and there are high requirements for equipment in the synthesis process, which has potential safety hazards and has a small range of applications.

Images