PROCESS FOR PREPARING WATER ABSORBENT RESIN WITH HIGH PERFORMANCE
First Claim
1. A process for preparing a water absorbent resin, comprising the steps of:
- (a) coarse pulverizing a gel-type resin while internal cross-linking and polymerizing the gel-type resin from an aqueous solution of a partially neutralized acrylic acid-based monomer having an acid group, in the presence of a first cross-linking agent, so as to form a coarse pulverized gel-type resin having the size of 3 to 150 mm;
(b) fine pulverizing the coarse pulverized gel-type resin so as to prepare a fine gel-type resin having the size of 1 to 20 mm;
(c) drying the fine gel-type resin;
(d) milling the dried fine gel-type resin and fractionating the same so as to prepare a base resin powder comprising particles having the size of 100 to 850 μ
m in an amount of 70 weight % or more; and
(e) surface cross-linking the base resin powder with a second cross-linking agent so as to prepare the water absorbent resin.
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Accused Products
Abstract
The present invention relates to a process for preparing a water absorbent resin, particularly to a process for preparing a water absorbent resin which can resolve the uneven size of the fine pulverized gel-type resin and long pulverizing time those are the problems of prior process for preparing the water absorbent resin, by carrying out the pulverizing process of the gel-type resin divided into the coarse pulverizing process which is carried out with the internal cross-linking polymerization, and the fine pulverizing process. According to the preparation process, it is possible to mass-produce the water absorbent resin showing excellent absorption under pressure and low extractable content.
13 Citations
10 Claims
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1. A process for preparing a water absorbent resin, comprising the steps of:
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(a) coarse pulverizing a gel-type resin while internal cross-linking and polymerizing the gel-type resin from an aqueous solution of a partially neutralized acrylic acid-based monomer having an acid group, in the presence of a first cross-linking agent, so as to form a coarse pulverized gel-type resin having the size of 3 to 150 mm; (b) fine pulverizing the coarse pulverized gel-type resin so as to prepare a fine gel-type resin having the size of 1 to 20 mm; (c) drying the fine gel-type resin; (d) milling the dried fine gel-type resin and fractionating the same so as to prepare a base resin powder comprising particles having the size of 100 to 850 μ
m in an amount of 70 weight % or more; and(e) surface cross-linking the base resin powder with a second cross-linking agent so as to prepare the water absorbent resin. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification