发明名称 |
PROCESS FOR PRODUCING POLYACRYLIC ACID (SALT)-BASED WATER-ABSORBING RESIN |
摘要 |
Provided is a method for producing a polyacrylic acid (salt)-based water absorbent resin in which the physical properties (especially liquid permeability) are improved and maintained even in large scale production. The method for producing a polyacrylic acid (salt)-based water absorbent resin, which sequentially includes a polymerization step, in which a monomer aqueous solution having acrylic acid (salt) as a main component is polymerized, a drying step, in which a water-containing gel-like crosslinked polymer obtained in the polymerization step is dried, and a classification step, in which a polymer obtained in the drying step is classified, wherein a rocking-type sieve classification apparatus is used in the classification step, and the rocking-type sieve classification apparatus has a sieve net having a trajectory and a rotation speed in the following ranges; radial gradient R: from 5 to 40 mm, tangential gradient T: from 0.1 to 25 mm, eccentric gradient E: from 40 to 80 mm, and rotation speed F: from 60 to 600 rpm. |
申请公布号 |
EP2881420(A1) |
申请公布日期 |
2015.06.10 |
申请号 |
EP20130825611 |
申请日期 |
2013.08.01 |
申请人 |
NIPPON SHOKUBAI CO., LTD. |
发明人 |
MATSUMOTO, MAKOTO;KATO, SEIJI;FUJINO, SHINICHI;NABARA, NOBORU;OTANI, RYUICHI;KAWAGUCHI, YASUHIRO;OKUGAWA, NARIMASA;ICHIKAWA, KENTARO;ETO, MAKOTO |
分类号 |
B07B1/46;B07B1/54;C08F220/06;C08J3/24 |
主分类号 |
B07B1/46 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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