Amphoteric polyacrylamide and preparation method thereof

Abstract

The invention discloses amphoteric polyacrylamide and a preparation method thereof. The preparation method comprises the following steps: mixing acrylamide, an anionic monomer containing carboxyl and an anionic monomer of quaternary ammonium salts to prepare a mixed monomer solution A, with dosage of compositions in portion by weight being 55 to 75 portions of the acrylamide, 5 to 15 portions of the anionic monomer containing carboxyl, 20 to 30 portions of the anionic monomer of quaternary ammonium salts, and 82 to 112 portions of deionized water; mixing the mixed monomer solution A of 10 to 30 percent of total weight, an evocating agent solution B of 10 to 30 percent of the total weight, a dispersing medium, a reducing agent and water to react to obtain a dispersion stabilizer C, and adding the rest mixed monomer solution A and the evocating agent solution B into the dispersion stabilizer C to react to obtain the amphoteric polyacrylamide. The preparation method adopts an aqueous solution dispersion polymerization method, simplifies production process, reduces the production cost, can easily control the production process, is easy for implementation, improves the product quality, and reduces environmental pollution.

Description

technical field [0001] The invention relates to a preparation method of amphoteric polyacrylamide. Background technique [0002] Polyacrylamide can be prepared by free radical aqueous polymerization, inverse emulsion polymerization, precipitation polymerization and other methods. This kind of polymer is widely used in water treatment, papermaking and other industries requiring low viscosity and good solubility. The aqueous solution polymerization process is simple, the polymerization yield is high, and there is little environmental pollution, so it is the preferred method for preparing amphoteric polyacrylamide. It can control the polymer reaction process and product properties by adjusting the initiation system, medium pH value, additives, temperature, etc. Although solution polymerization has many advantages, it also has many disadvantages. It is difficult to prepare polyacrylamide with high solid content and high relative molecular weight. Taking acrylamide as an example...

AI Technical Summary

Problems solved by technology

Although solution polymerization has many advantages, it also has many disadvantages. It is difficult to prepare polyacrylamide with high solid content and high relative molecular weight. Taking acrylamide as an example, when the monomer content exceeds 15%, the viscosity of the system reaches 100mpa. s, the heat dissipation of the reaction is very difficult, prone to implosion, and the polymer has poor water solubility

Although inverse emulsion, inverse suspension, precipitation polymerization, etc. can effectively solve these problems, a large amount of organic solvents are used, and there are problems such as pollution and production costs, and the water solubility of the product is relatively poor, so it is very difficult to use

The high-molecular-weight polyacrylamide currently on the market is usually a 1-2% solution or a solid powder product. The transportation and storage of the former and the long dissolution time of the latter make the use of such products waste a lot of manpower. and financial resources and inconvenience