Simple preparation method of polyacrylic acid series super absorbent resin

Abstract

The invention relates to a simple preparation method of a polyacrylic acid-series super absorbent resin, and belongs to the technical field of water-absorbent polymer materials. The method comprises the following steps: adding an internal cross-linking agent and an initiator into an acrylic unsaturated monomer aqueous solution to form an aqueous solution polymerization system; carrying out initiated polymerization to form a hydrogel polymer with a cross-linked structure; and granulating the hydrogel polymer multiple times, adding a surface cross-linking agent in the granulating process, drying, and completing a surface cross-linking reaction in the drying process to obtain a finished product. According to the method disclosed by the invention, granulation is carried out multiple times, a surface cross-linking procedure is introduced in the granulation process, the surface of a hydrogel is coated with a surface cross-linking agent by utilizing extrusion, rubbing and shearing effects generated by granulation, and a drying process and a surface cross-linking heating process are combined and completed in one step, so that surface cross-linking equipment and matched heating and drying equipment are reduced finally, and the grinding, grading and repeated conveying procedures of the dried materials are reduced, the production efficiency is guaranteed, the technological process is more compact, and the equipment investment is lower.

Description

technical field [0001] The invention relates to a simple preparation method of polyacrylic acid superabsorbent resin, in particular to a highly absorbent polyacrylic resin suitable for the fields of sanitary products for women and children, pet products, vegetation water retention, fresh food transportation, cable water blocking and oil field plugging. molecular material. Background technique [0002] With the continuous and rapid development of the petrochemical industry, it has driven the continuous development of the acrylic acid industry and provided a large number of raw material resources for the development of super absorbent resins. Superabsorbent resin is a water-swellable polymer containing strong hydrophilic groups such as carboxyl groups and a certain degree of crosslinking. Compared with traditional water-absorbing materials, it has the characteristics of high water absorption and strong water retention. The capacity can reach hundreds to thousands of times of ...

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Problems solved by technology

Therefore, in order to ensure a good surface cross-linking coating effect, the requirements for surface cross-linking coating equipment and process control level are very high. At the same time, the surface cross-linking reaction needs to be heated after spraying the surface cross-linking agent to be finally realized. External linking effect, so the surface cross-linking process needs to be equipped with a special surface cross-linking coating machine and supporting heating and drying equipment. CN200980108678 uses the resin particles after drying and grading to carry out surface cross-linking reaction by drying machine or heating furnace. CN200610171193 uses A stirring device with multiple stirring plates or stirring blades is used to heat the resin particles and complete the surface crosslinking reaction, the production process is relatively complicated, and the investment in equipment is increased

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