A kind of water-absorbent resin used in wet method for manufacturing absorbent paper and its preparation method

Abstract

The present invention relates to a water-absorbent resin for wet-processed water-absorbent paper and a preparation method thereof. The method is as follows: after mixing acrylic acid, water, cross-linking agent and hydrophobic silica, nitrogen and oxygen removal are added, an initiator is added to initiate polymerization, and then heat preservation treatment is performed to obtain a polymerized colloid; the polymerized colloid is granulated to obtain resin particles; Neutralize the resin particles, spray the first surface treatment liquid for surface treatment, and then dry and crush to obtain water-absorbent resin particles; spray the second surface treatment liquid on the surface of the water-absorbent resin particles for surface treatment to obtain polymer water-absorbent resin particles ; After heating the polymer water-absorbent resin particles to 100-160° C., adding a coating agent, adding liquid silica and stirring evenly, and cooling to obtain the water-absorbent resin. The water-absorbent resin of the present invention can delay the absorption of water at the initial stage during the compounding process with the pulp, thereby ensuring the sufficient mixing of the water-absorbent resin and the pulp, and is very suitable for wet-process manufacturing of water-absorbent paper.

Description

technical field [0001] The invention relates to the field of polymerized functional polymer chemical additives, in particular to a water-absorbing resin used for wet-process production of water-absorbing paper and a preparation method thereof. Background technique [0002] Superabsorbent resin is widely used in the preparation of absorbent paper because of its good water absorption and water retention capacity. At present, the production method of absorbent paper on the market is the dry composite method, that is, spray glue on the surface of the wood pulp layer and then disperse the superabsorbent resin. To the surface of the wood pulp paper layer, the production method of absorbent paper has lower requirements on the performance of superabsorbent resin, but there are many hidden dangers, such as uneven distribution of polymer absorbent resin, and high shedding of diapers or sanitary napkins is often found. Molecular water-absorbing resin affects water absorption, etc. For ...

AI Technical Summary

Problems solved by technology

However, due to the strong hydrophilicity of ordinary superabsorbent resin, it will absorb a large amount of liquid in the process of mixing with pulp when it is applied to wet papermaking. After drying, the performance of polymer water absorbent resin (SAP) will decline seriously. When the superabsorbent resin is used in the preparation process of wet-process absorbent paper, there will be serious problems such as the water retention rate and liquid-through capacity of the polymer water-absorbent resin after wet processing.

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