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Water-absorbent composition containing water-absorbent polymer structures for smell control

A technology of water-absorbing polymers and compositions, applied in the direction of active ingredients of salicylic acid, absorbent pads, fertilizer mixtures, etc., which can solve the problems of imperfect application of superabsorbent particles and failure to provide odor-binding performance superabsorbents, etc.

Active Publication Date: 2013-07-17
EVONIK SUPERABSORBER GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the specification discloses an imperfect solution for the application of superabsorbent particles and does not provide any superabsorbents with odor-binding properties particularly suitable for hygiene products

Method used

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  • Water-absorbent composition containing water-absorbent polymer structures for smell control
  • Water-absorbent composition containing water-absorbent polymer structures for smell control
  • Water-absorbent composition containing water-absorbent polymer structures for smell control

Examples

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preparation example Construction

[0085] Particular preference is given to using redox systems comprising hydrogen peroxide, sodium peroxodisulfate and ascorbic acid in the production of water-absorbing polymer structures.

[0086] The preparation of the polymer structure can also adopt inverse suspension / emulsion polymerization. According to these methods, partially neutralized aqueous solutions of monomers (α1) and (α2), optionally containing water-absorbing polymers and auxiliary substances, are dispersed in hydrophobic organic solvents by means of protective colloids and / or emulsifiers, and the polymerization reaction Initiated by free radical initiators. The crosslinker is either dissolved in the monomer solution and metered in together with it, or added separately, optionally during the polymerization. The water-absorbing polymer (α4) as graft base is optionally added via monomer solution or initially introduced directly into the oil phase. Water is then removed azeotropically from the mixture and the ...

Embodiment 1a

[0160] Example 1a Providing a water-absorbing polymer structure (step i))

[0161] A monomer solution containing 300 g of acrylic acid neutralized to 75 mol % with sodium hydroxide solution, 441 g of water, 0.9 g of polyethylene glycol 300 diacrylate and 1.35 g of allyloxy polyethylene glycol acrylate was blown through with nitrogen Dissolved oxygen was swept away and cooled to the starting temperature of 4°C. When the starting temperature is reached, add the initiator solution (10 g H 2 0.3 g sodium persulfate in O, 10 g H 2 0.07 g of 35% hydrogen peroxide solution in O and 2 g of H 2 0.015g ascorbic acid in O). When a final temperature of about 100°C was reached, the gel formed was cut to obtain particle particles of about 1-3 mm particle size. The water content is about 50%. These particles were dried at 150°C for 120 minutes. The dry polymer was coarsely crushed, ground, and sieved into a powder (powder A) with a particle size of 150-850 μm.

Embodiment 2a

[0162] Example 2a Surface postcrosslinking of water-absorbing polymer structures (step ii))

[0163] For post-crosslinking, 100 g of powder A obtained above was mixed with a solution of 1 g of 1,3-dioxolan-2-one and 3 g of water under vigorous stirring, and the mixture was then placed in an oven controlled at 180° C. Heat for 30 minutes. A surface postcrosslinked water-absorbing polymer structure (powder B) is thus obtained.

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Abstract

The present invention relates to a water-absorbing composition comprising water-absorbing polymer structures and a compound of the structure I in which R1, R2, R3 and R4 can be identical or different and in each case represent a hydrogen atom, a halogen atom, a C1- to C4-hydrocarbon group or a hydroxyl group, R5 represents a hydrogen atom, a C1- to C4-hydrocarbon group or an acetyl group, n represents an integer chosen from the group consisting of 1, 2 or 3 and Mn+ represents an n-valent metal cation or an H+ cation. The present invention also relates to a process for the preparation of a water-absorbing composition, the water-absorbing composition obtainable by this process, a composite, a process for the production of a composite, the composite obtainable by this process, and products, such as hygiene articles.

Description

technical field [0001] The present invention relates to a water-absorbing composition, a method for preparing a water-absorbing composition, a water-absorbing composition obtainable by this method, a composite, a method for preparing a composite, a method obtainable by this method Compounds, chemical products such as hygienic articles, water-absorbent compositions or uses of compounds, and uses of compounds as defined. Background of the invention [0002] Superabsorbents are water-insoluble cross-linked polymers that can absorb and retain large quantities of aqueous liquids, especially bodily fluids, especially urine or blood, under pressure, swell and form hydrogels. Typically, the liquid uptake is at least 10 times or even at least 100 times the amount of water compared to the dry weight of the superabsorbent or superabsorbent composition. Based on these properties, these polymers are mainly used in hygiene products such as baby diapers, incontinence products or sanitary ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L33/02C08K5/098C09K17/20B65D81/26A61L15/60
CPCA61L15/46A61L2300/102A61L2300/21A61L15/60C08K5/098A61L15/18A61L2300/404A61K31/60C08L33/02
Inventor L·瓦特布莱德F·弗诺
Owner EVONIK SUPERABSORBER GMBH
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