Moisture absorption product with high salt resistance and high water absorbency

Abstract

The invention discloses a moisture absorption product with high salt resistance and high water absorbency. The moisture absorption product comprises a liquid-permeable surface layer, a flow guide layer, a liquid-tight bottom layer and an absorption core disposed between the liquid-permeable surface layer and the liquid-tight bottom layer. A hydrophilic polyurethane flexible foam layer with a function of ion exchange is disposed between the liquid-permeable surface layer and the liquid-tight bottom layer. The density of the hydrophilic polyurethane flexible foam layer is 0.01-0.12g / cm<3>, mass percent of ion exchange resin is 0-60%, and ion exchange capacity is 0-6.0mmlo / g. The moisture absorption appliance includes sanitary napkins, infant paper diapers, adult paper diapers or pet pads. The ion exchange resin is one or more of positive ion exchange resin, negative ion exchange resin, chelate ion exchange resin. Accordingly, water absorption capacity of super absorbent resin in the absorption core can be improved greatly, and salt resistance and liquid permeability of the super absorbent resin are also improved.

Description

technical field [0001] The invention relates to a hygroscopic article, in particular to a hygroscopic article containing soft hydrophilic polyurethane foam material with ion exchange function. Background technique [0002] The full name of polyurethane is polyurethane, which is a general term for macromolecular compounds containing repeated carbamate groups (-NHCOO-) in the main chain. It is formed by addition polymerization of organic diisocyanate or polyisocyanate and dihydroxy or polyhydroxy compound. The unit is formed by the reaction of isocyanate group and hydroxyl group. The reaction formula is as follows: —N=C=O + HO — → —NH-COO—. [0003] As a new type of polymer synthetic material, polyurethane flexible foam material is mostly open-cell structure with certain elasticity and softness. Therefore, it has the properties of low density, good elastic recovery, sound absorption, breathability, heat preservation, etc. It is mainly used as cushion materials such as furnit...

AI Technical Summary

Problems solved by technology

However, although polyacrylic acid (salt) superabsorbent resins have the advantages of fast water absorption, high water absorption ratio, and good heat resistance compared with other synthetic superabsorbent resins, polyacrylic acid (salt) superabsorbent resins are highly absorbent. Molecular electrolyte, poor salt resistance, seriously affects its application performance

[0010] However, the composition of human body fluids is complex. For example, human urine is mainly composed of urea and various inorganic salt ions, such as Cl - 、Na + 、K + , SO 4 2- Wait

Since the superabsorbent resin is a polymer electrolyte, various ionic components will have the same ion effect on its water absorption process. Therefore, these components have a serious impact on the water absorption capacity of the superabsorbent resin, which is manifested as the liquid absorption of the superabsorbent resin. The magnification is greatly reduced, resulting in a decrease in the absorption of urine by the absorbent core of the sanitary product, which affects the performance of the sanitary product. For example, when the sanitary product is worn by a child, urine leakage is likely to occur. At the same time, the surface of the sanitary product is rewet. The amount increases, the dryness decreases, and it is easy to cause rashes on the skin of children, etc.

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