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Water-absorbing polymer structure having great ammonia-binding capacity

A technology of water-absorbing polymers and structures, applied in fertilizer mixtures, absorbent pads, animal repellents, etc., can solve problems such as reduced swelling properties, temperature sensitivity, and low polymer network ionicity

Inactive Publication Date: 2008-08-13
EVONIK DEGUSSA GMBH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

A further disadvantage of a degree of neutralization of 50 mol% or less is the low ionicity of the polymer network, which greatly reduces the swelling properties
The disadvantage of such sanitary products is that on the one hand, it is necessary to increase the process step of adding lactic acid-producing bacteria in the production process of sanitary products, and on the other hand, because the lactic acid-producing bacteria are sensitive to temperature, the odor of such sanitary products Binding properties can be adversely affected by environmental influences (especially high or low temperatures)
However, the superabsorbents mentioned in this prior art have the disadvantage that their ability to bind ammonia is very low

Method used

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  • Water-absorbing polymer structure having great ammonia-binding capacity

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Embodiment Construction

[0141] 1. Preparation of untreated water-absorbing polymer structures (process step i))

[0142] From 2,400g of acrylic acid, 1,332.2g of NaOH (50% concentration), 4,057.4g of deionized water, 2.14g of polyethylene glycol-300-diacrylate (active ingredient content of 78.4wt.%), 6.92g Monoallyl polyethylene glycol-450-monoacrylate (active ingredient content is 72.8wt.%) and 65.36g of polyethylene glycol-750-monomethacrylate methyl ether (active ingredient content is 73.4 wt.%) monomer solution composed of nitrogen to remove dissolved oxygen, and cooled to the initial temperature of 4 ° C. After reaching the starting temperature, the initiator solution (2.4 g sodium persulfate in 77.6 g H2O, 0.56 g 30% hydrogen peroxide solution in 15.44 g H2O, and 0.12 g ascorbic acid in 39.88 g H2O) was added. After the final temperature reached about 100°C, the gel thus obtained was pulverized using a meat grinder and dried in a drying oven at 150°C for 2 hours. The dried polymer was coarsel...

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Abstract

The invention relates to a method for producing a water-absorbing polymer structure. Said method comprises the following steps: i) an untreated, water-absorbing polymer structure is provided that has a maximum neutralization rate of 70 mole percent; ii) the untreated, water-absorbing polymer structure is brought in contact with an acid component. The invention also relates to the water-absorbing polymer structures obtained using said method, water-absorbing polymer structures, a compound, a method for producing a compound, the compound obtained using said method, foams, molded articles, fibers, foils, films, cables, sealing materials, liquid-absorbing hygiene articles, carriers for plant growth and fungal growth regulators, packaging materials, soil additives, or construction materials, and the use of a water-absorbing polymer structure.

Description

technical field [0001] The invention relates to a process for the preparation of water-absorbent polymer structures, water-absorbent polymer structures obtained by the process, water-absorbent polymer structures, composites, processes for the preparation of composites, composites obtained by the process, foams, moldings Articles, fibres, sheets, films, cables, sealing materials, liquid-absorbing hygienic articles, carriers for plant and fungal growth regulators, packaging materials, soil additives or building materials, also the use of water-absorbing polymer structures. Background technique [0002] Superabsorbents are water-insoluble crosslinked polymers which are able to absorb large quantities of water and aqueous liquids (in particular body fluids, preferably urine or blood) by swelling and forming hydrogels and to retain them under pressure. Preferably, the superabsorbent absorbs at least 100 times its weight in water. Superabsorbents are further described in "Modem S...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/14C08J9/00C08J5/18C09K3/10C09K17/18A61L15/24C08L101/02A01N25/10
CPCA61L15/60A61L15/46A61L2300/21C08J7/12C08J7/14A61L15/18A61L15/20A61L15/24
Inventor 约尔格·哈伦斯特凡·拉姆洛阿克塞尔·布施弗兰克·富尔诺
Owner EVONIK DEGUSSA GMBH
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