A kind of preparation method of water-soluble acid sodium polyacrylate

Abstract

The invention relates to the field of polymer polymerization and particularly relates to a preparation method of water-soluble acidic sodium polyacrylate. The preparation method comprises: (1) preparation of a composite retarder, (2) preparation of a solubilizing agent, (3) preparation of an aqueous solution of a photothermal initiator, (4) preparation of a neutralizing solution, 5) preparation ofa glue solution, and (6) a reaction initiated by light or heat. The preparation method has simple processes, has no pollution and is environmentally friendly. The water-soluble acidic sodium polyacrylate has high viscosity, low insoluble matter content, low residual amount and excellent performances.

Description

technical field [0001] The invention relates to the field of polymer polymerization, in particular to a preparation method of water-soluble acidic sodium polyacrylate. Background technique [0002] Sodium polyacrylate is a new type of functional polymer material and an important chemical product, which can be used as a thickener to increase the viscosity of the system. The water-soluble acidic sodium polyacrylate has a high molecular weight of about 3 million, a viscosity of <50%, and a degree of neutralization of <50%. There are many reports on the preparation of sodium polyacrylate and sodium polyacrylate at present, but there is no effective preparation method about water-soluble acidic sodium polyacrylate. [0003] The currently synthesized sodium polyacrylate is slightly alkaline, and its reason is that the process steps of synthesizing soluble acidic sodium polyacrylate are more complicated than that of basic sodium polyacrylate. For example, in the process of ...

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Problems solved by technology

[0004] To produce high-quality water-soluble acidic sodium polyacrylate, the following problems must be solved: one is how to shorten the initiation period, because too long initiation period will not only affect the production efficiency, but also cause monomer disproportionation reaction to make its water solubility worse ; The second is how to prevent the polymerization process from being too aggressive. The key is to export the heat of polymerization generated in time, because the increase in temperature will increase the polymerization reaction speed and quantity exponentially, which will cause the product to gel, and will also bring hidden dangers to production safety; the third is currently Synthetic sodium polyacrylate mostly uses inorganic oxidation-reduction initiators. Although its initiation temperature is low, it is easy to cause disproportionation of monomers, low degree of polymerization, and high residual single content (up to >2%)