Method for preparing water-soluble polymers

Abstract

The invention discloses a method for preparing water-soluble polymers, belonging to the field of polymer preparing technologies. According to the method, the shortage that polyacrylate or polyacrylic acid is prepared through directly polymerizing acrylates and acrylic acids, which serve as monomers, is abandoned, and a method that the polyacrylate or polyacrylic acid is prepared through indirectly polymerizing lipophilic substances and hydrophilic substances, which serve as monomers, is provided. According to the method, suspension polymerization and alkali liquor hydrolysis methods are comprehensively and simultaneously used, namely that the lipophilic substances and the hydrophilic substances serve as the monomers, copolymers are synthesized by adopting the conventional suspension polymerization method, then, the polyacrylate is prepared by adopting an alkali liquor hydrolysis method, or the polyacrylic acid is prepared by adopting alkali liquor hydrolysis and acidification combined methods. The suspension polymerization has the advantages that the heat of polymerization is easy to dissipate, the temperature of polymerization reaction is easy to control, the distribution of molecular weight of polymerization products is narrow, the polymerization products are solid bead-shaped particles and are easily separated and dried, and the like; particularly, during polymerization, water serves as a continuous phase, so that the environment can not be polluted, and the requirements for sustainable development are met.

Description

technical field [0001] The invention relates to a polymer manufacturing technology, in particular to a water-soluble polyacrylic acid salt or polyacrylic acid manufacturing method. The manufacturing method comprehensively utilizes suspension polymerization and alkali hydrolysis. Background technique [0002] Water-soluble polymer is a kind of highly hydrophilic polymer material, which can be dissolved in water to form a uniform aqueous solution. The hydrophilic group in the water-soluble polymer not only makes it water-soluble, but also has chemical reaction functions and various physical functions such as dispersion, flocculation, viscosity increase, drag reduction, adhesion, film formation, gelation, and chelation. . Together with surfactants, they are called the two pillars of fine chemicals, and have been widely used in petroleum exploration and development, water treatment, papermaking, textiles, coatings, food, daily chemicals and other fields. [0003] Acrylic acid ...

AI Technical Summary

Problems solved by technology

Nevertheless, reversed-phase suspension polymerization still has its fatal shortcomings, that is, a large amount of oily substances are used as the continuous phase during the polymerization process, which is very easy to pollute the environment. After the polymerization reaction, the product and oily substances need to be separated, which increases the cost. Residual oily substances will affect the performance of the product, and will also cause secondary pollution to the environment. These shortcomings limit the development of reverse-phase suspension polymerization to synthesize water-soluble polymers.