Method for disintegrating hydrate polymer and method for production of water-absorbent resin

A technology for hydrating polymers and polymers, used in grain processing and other directions, can solve problems such as changing the properties of water-absorbent resins, and achieve the effects of inhibiting the formation of agglomerates, less physical and chemical damage, and reducing losses

Active Publication Date: 2005-01-26
NIPPON SHOKUBAI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Crushing methods are known to alter the performance of absorbent resins

Method used

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  • Method for disintegrating hydrate polymer and method for production of water-absorbent resin
  • Method for disintegrating hydrate polymer and method for production of water-absorbent resin
  • Method for disintegrating hydrate polymer and method for production of water-absorbent resin

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preparation example Construction

[0041] (1) Preparation of monomer solution

[0042] The hydrated polymer which is the intended breaking target of the present invention is a hydrated polymer having a carboxyl group obtained by, for example, polymerization of a hydrophilic unsaturated monomer having acrylic acid and / or its salt as a main component. As specific examples of hydrated polymers conforming to this description, mention may be made of previously known polymers which form hydrophilic crosslinked polymers which are swellable with water and which are insoluble in water.

[0043] The hydrophilic cross-linked polymer preferably has 30mol%-100mol%, suitably 50mol%-90mol%, especially 60mol%-80mol% of its acidic groups neutralized with such as alkali metal salts, ammonium salts or amine salts . The expression "a hydrated polymer bearing a carboxyl group" should therefore be considered to include "a hydrated polymer bearing a carboxyl group and / or a salt thereof". Neutralization of the acidic groups can be a...

example

[0069] The present invention will now be described more specifically with reference to the following examples and comparative examples. The present invention is not limited to these examples. In Examples, the term "part" means "part by weight" unless otherwise specified, and the measurement temperature is within the approximate range of 23±2°C.

[0070] (Measurement methods)

[0071] The water-absorbing capacity of the water-absorbent resin was determined by the following calculation.

[0072] (1) Determination of no-load water absorption capacity (GV)

[0073] About 0.2 g of a given water-absorbent resin was weighed, placed in a nonwoven bag (60 mm x 60 mm), and immersed in a 0.9% by weight sodium chloride solution (physiological saline). After standing for 30 minutes, take out the bag from the solution, and use a centrifugal separator at 250×9.81 m / s 2 (250G) shake water for 3 minutes, measure the weight W of the bag 1 (gram). Repeat the process without the absorbent r...

example 1

[0083] use Figure 4 The shown apparatus prepares a water-absorbent resin. By providing in the dispersing device 460 the flow rate regulated by the pump 413 as 48.5% (by weight) sodium hydroxide solution as the alkaline solution 410 for neutralization, the flow rate regulated by the pump 423 is 7.24 g / s acrylic acid As the hydrophilic monomer 420, the flow rate is 30% (weight) polyethylene glycol diacrylate (average molecular weight 487) solution of 0.0287 g / s. As the first internal crosslinking agent 445, the total flow rate is 3.32 g / s water 441 as the concentration adjustment water 441, and the flow rate is 0.0893 g / s to dissolve 0.989 parts by weight of 1-hydroxy-cyclohexyl-phenyl ketone and 1.08 parts by weight of 45% (by weight) pentasodium diethylenetriaminepentaacetic acid solution A solution obtained in 97.4 parts by weight of a 20% by weight acrylic acid solution was used as the second internal crosslinking agent 447 to prepare a monomer solution 470 . At this time...

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Abstract

A method for disintegrating a hydrate polymer characterized by disintegrating a hydrate polymer having a solid content in the range of 50-70 wt. % with a screw extruder while supplying 0.1-30 parts by weight of water per 100 parts by weight of the polymer to the extruder. Since the product of disintegration is prevented from inducing mutual adhesion, it does not form masses of conglomeration when it is dried.

Description

technical field [0001] The present invention relates to a method of disintegrating a hydrated polymer, and a method of producing a water-absorbent resin which uses the disintegration step as part of its production process. More specifically, the present invention relates to a crushing method of a hydrated polymer, wherein when a screw extruder is used to crush a hydrated polymer, water is added to the device for crushing, the device is prevented from kneading action during crushing, and the The crushed product is arranged in a dryer with a uniform thickness; and a method for producing a water-absorbent resin using the crushing step as part of its production process. Background technique [0002] Water-soluble resins have the property of absorbing large amounts of water, and have been used as materials for forming sanitary products such as disposable diapers, sanitary napkins, and incontinence underwear, soil water retaining agents, and food drip absorbing sheets. Especially...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C48/04B29C48/285B29C48/29B29C48/295B29C48/76
CPCB29C47/0011B29K2995/0092B29C47/0004B29C47/1072B29C47/10B29C47/762B29C47/1063B29C47/1027C08J3/124C08J2300/14B29C48/288B29C48/29B29C48/022B29C48/04B29C48/285B29C48/295B29C48/762B29B9/12B29B9/06B29B7/422B29B7/428C08F2/10B29B7/582C08F2/01C08F6/008C08F220/06C08F222/102
Inventor 入江好夫大六赖道藤田康弘多田贤治柴田浩史
Owner NIPPON SHOKUBAI CO LTD
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