发明名称 |
METHOD FOR PRODUCING POLYACRYLIC ACID (SALT) WATER ABSORBENT RESIN |
摘要 |
Disclosed is a method for producing a water absorbent resin, by which a surface-crosslinked water absorbent resin having excellent physical properties can be efficiently obtained at low cost, while assuring high productivity. When the production scale is increased to a continuous production on a huge scale (for example, 1 t/hr or more), the physical properties are improved and stabilized (for example, standard deviation of the physical properties is reduced) by a surface-crosslinking treatment, and the absorption against pressure (AAP) and liquid permeability (SFC) are further improved. Specifically disclosed is a method for continuously producing a polyacrylic acid (salt)-type water absorbent resin powder, which comprises: a step of preparing an aqueous monomer solution using an acrylic acid (salt); a step of polymerizing the aqueous monomer solution; a shredding step of a hydrous gel-like crosslinked polymer during or after the polymerization; a step of drying the thus-obtained particulate hydrous gel-like crosslinked polymer; a step of crushing and classifying the dried product; a step of heating and surface-crosslinking after the classification; and a step of cooling after the surface-crosslinking. In the method for producing a polyacrylic acid (salt)-type water absorbent resin, the internal area of the cooling device that is used in the cooling step is 0.25-0.95 times the internal area of the heating device that is used in the surface-crosslinking step. |
申请公布号 |
EP2471843(A1) |
申请公布日期 |
2012.07.04 |
申请号 |
EP20100812020 |
申请日期 |
2010.08.27 |
申请人 |
NIPPON SHOKUBAI CO., LTD. |
发明人 |
NOGI, KOZO;ISHIZAKI, KUNIHIKO;WADA, KATSUYUKI |
分类号 |
A61L15/24;A61L15/60;C08F120/06;C08F220/06;C08J3/24 |
主分类号 |
A61L15/24 |
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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