Novel method for preparing polyacrylate aqueous solution

Abstract

The invention discloses a novel method for preparing a polyacrylate aqueous solution. The method comprises the following steps: respectively adding the following components in parts by mass into a reaction kettle: 100-500 parts of acrylate monomer, 100-300 parts of high-purity water and 200-400 parts of a base catalyst, and uniformly stirring and mixing; dropwise adding 100-300 mass parts of hydrogen peroxide having the concentration of 20-50 percent into the reaction kettle at a refluxing temperature, holding the temperature, initiating a carbon-carbon double bond to generate a free radical chain polymerization reaction by a hydroxyl radical (HO) or peroxy radical (H-O-O) mono initiation system generated during the decomposition of hydrogen peroxide under the catalysis of any of sodium hydroxide, potassium hydroxide, ammonia water and organic amine. The method has the advantages of stable process, convenience in operation, high reacting speed, high conversion rate, safe process flow and environmental friendliness; a polyacrylate aqueous solution prepared by utilizing the method does not contains substances toxic or hazard to the using environment such as sulfur, phosphorus and thelike, can meet the application requirement in the fields of drinking water treatment, electronic washing and the like, and is easy for large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of organic polymer preparation, in particular to a method for preparing an aqueous solution of high-purity and low-molecular-weight polyacrylic acid using acrylic acid and its derivatives as monomers. Background technique [0002] Water-soluble polymers, especially low-molecular-weight polycarboxylic acids and their salts, are more and more widely used because of their good anti-scaling and slow-release properties, high thermal stability, excellent dispersibility, and convenient use. Used as water treatment additives in various fields. With the development of the industry and the continuous expansion of products in high-end application fields, the requirements for the purity of products are becoming more and more refined, so the requirements for the synthesis process of products are becoming more and more stringent. Green and safe product preparation methods will surely become a research hotspot. [0003] T...

AI Technical Summary

Problems solved by technology

[0009] In order to overcome practical problems such as complex process, harsh reaction conditions, and large amount of raw materials, the present invention provides a single-initiation method using high-temperature alkali-catalyzed hydrogen peroxide decomposition to produce hydroxyl radicals (HO·) or peroxyl radicals (H-O-O·) Preparation of Low Molecular Polyacrylate Solution by System-Initiated Carbon-Carbon Double Bonds for Free Radical Chain Polymerization