A water-absorbent resin suitable for wood pulp core diapers and its preparation method

Abstract

The invention discloses a water absorbent resin suitable for a wood-pulp core and a preparing method thereof. The preparing method includes the following steps that after acrylic acid and deionized water are mixed, then a neutral reaction is carried out with a sodium hydroxide solution, the reaction is completed, then a sodium metasilicate water solution, acrylamide, a cross-linking agent and an initiating agent are sequentially added, and a milk-white mixed solution is obtained; nitrogen is introduced, mixed liquid is subjected to a polymerization reaction under ultraviolet rays, and transparent colloid is obtained; the colloid is granulated, dried and smashed, and resin powder is obtained; the resin powder is taken and evenly stirred with sodium metaaluminate, surface treatment liquid isadded for treatment, and the product is obtained. According to the water absorbent resin suitable for the wood-pulp core and the preparing method thereof, nanoscale silicon dioxide is generated in the neutral process and evenly dispersed in a reaction system and is capable of improving the liquid passing performance and the diffusivity of the water absorbent resin; the water absorbent resin prepared with the method is low in residual monomer, small in reverse osmosis amount, large in water retaining capacity, high in particle strength after water absorption, loose and particularly suitable for a wood-pulp-core paper diaper.

Description

technical field [0001] The invention relates to the field of water-absorbing resins, in particular to a water-absorbing resin suitable for wood pulp core paper diapers and a preparation method thereof. Background technique [0002] Super Absorbent Polymer (SAP) is a new type of functional polymer material with a large number of hydrophilic groups. It has a high water absorption function of absorbing water hundreds to thousands of times heavier than itself, and has excellent water retention performance. Once it absorbs water and swells into a hydrogel, it is difficult to separate the water even if it is pressurized. Water-absorbing resins are widely used and have a very broad application prospect. The main purpose is mainly sanitary materials, accounting for about 70% of the total market. Water-absorbent resins are mainly used in sanitary products such as diapers, sanitary napkins, breast pads, mattresses, etc. The amount of water-absorbent resin in paper diapers accounts ...

AI Technical Summary

Problems solved by technology

Because the fluff pulp has good hydrophilicity and excellent drainage performance, the wood pulp core absorbs urine faster; but the fluff pulp will expand rapidly after absorbing water, making the wood pulp core absorb water compared to the composite core. The body needs to be thick, so the diapers with wood pulp cores will have the problem of easy breakage and spinning after absorbing water; and the air permeability of the diapers is poor, and the broken surface is not absorbent, resulting in uneven absorption of the diapers

[0004] For the wood pulp core used in diapers, if the wood pulp core is made of a water-absorbing resin that absorbs water too quickly, the absorption and diffusion of the diaper will be poor, because the diaper absorbs urine quickly, resulting in excessive local absorption. , resulting in a large amount of reverse osmosis and urine leakage in the diapers, which can easily cause skin eczema and even red buttocks of the baby; if a water-absorbing resin with a slow water absorption speed is used, the diffusibility can be improved to a certain extent, but after repeated water absorption, Due to the slow absorption rate of water-absorbent resin, it is easy to cause urine leakage, and the diapers are wet after absorbing water

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