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Method for production of water-absorbent resin and plow-shaped mixing device

A technology of water-absorbing resin and mixing equipment, which is applied in the directions of mixers, mixers, mixing methods, etc. with rotary stirring devices, can solve the problems of reducing productivity, loss, and difficulty in improving absorption capacity, and achieve the effect of suppressing aggregates

Active Publication Date: 2005-02-02
NIPPON SHOKUBAI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Even when the particles have been treated with a surface cross-linking agent, the treatment is not easy to improve various solid-state properties such as absorbency under pressure, but inevitably leads to problems such as loss due to throwing away useless fragments, and thus reduces productivity, increases waste disposal costs

Method used

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  • Method for production of water-absorbent resin and plow-shaped mixing device
  • Method for production of water-absorbent resin and plow-shaped mixing device
  • Method for production of water-absorbent resin and plow-shaped mixing device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0093] In a kneader equipped with two σ-shaped blades, prepare a monomer-containing monomer aqueous solution composed of sodium acrylate, acrylic acid and water, the monomer concentration is 35wt%, the neutralization ratio is 70mol%, polyethylene glycol Diacrylate (average number of ethylene glycol units: 9) was dissolved therein as an internal crosslinking agent to a concentration of 0.04 mol % (relative to the monomer). Then, nitrogen gas was blown into the aqueous monomer solution to reduce the dissolved oxygen concentration in the aqueous monomer solution, and the entire interior of the reaction vessel was substituted with nitrogen gas. Subsequently, sodium persulfate was added up to 0.12 g / mol (relative to the monomer) and L-ascorbic acid up to 0.005 g / mol (relative to the monomer) as polymerization initiators. The temperature of the aqueous monomer solution was 15°C. When the aqueous monomer solution starts to polymerize, the stirring is stopped, and the polymerization ...

Embodiment 2

[0110] The water-absorbing resin and the aqueous solution containing the surface crosslinking agent were continuously mixed according to the method of Example 1, while keeping the crushing blade in a stop state during the operation.

[0111] When the finally obtained wet water-absorbent resin was passed through a 10 mm sieve, the ratio of aggregates remaining on the sieve was 10%.

[0112] The wet water-absorbent resin that passed through the sieve was heat-treated at a temperature of the water-absorbent resin of 205° C. using a double paddle dryer, and the modified water-absorbent resin (2) was obtained after an average residence time of 50 minutes.

[0113] The water-absorbent resin (2) thus obtained was measured to have an absorption capacity of 35 (g / g), and an absorption capacity under pressure of 24 (g / g).

Embodiment 3

[0115] The water-absorbent resin and the aqueous solution containing the surface crosslinking agent were continuously mixed according to the method of Example 1. Mixing equipment without cylinders made of polytetrafluoroethylene was also used.

[0116] The wet water-absorbent resin thus obtained showed signs of uneven mixing. When the wet water-absorbent resin was sieved through a 10 mm sieve, the ratio of aggregates remaining on the sieve was about 40 wt%. The inside of the mixing equipment sleeve and around the agitator shaft showed signs of wet absorbent resin adhesion.

[0117] The wet water-absorbent resin passed through the sieve was heat-treated at a water-absorbent resin temperature of 205° C. with a double paddle dryer, and a modified water-absorbent resin (3) was obtained after an average residence time of 50 minutes.

[0118] The absorption capacity of the water-absorbent resin (3) was 32 (g / g), and the absorption capacity under pressure was 18 (g / g).

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Abstract

A method for mixing a water-absorbent resin and a surface cross-linking agent-containing solution to repress aggregates is equipped. The water-absorbent resin and the surface cross-linking agent-containing solution is mixed with a plow-shaped mixing device which is equipped with an inner wall formed of material manifesting an interfacial contact angle of not less than 60° to water and possessing a temperature of heat distortion of not lower than 70° C., a plow-shaped stirring vane and a disintegrating blade.

Description

technical field [0001] The invention relates to a method for modifying a water-absorbing resin, including the step of mixing the water-absorbing resin and an aqueous solution, and a method for preparing the modified water-absorbing resin. More specifically, the present invention relates to a method for modifying a water-absorbing resin, including the use of mixing equipment of a specific structure, or the step of uniformly mixing the water-absorbing resin and the aqueous solution by adding a specific amount of the water-absorbing resin to the water-absorbing resin, and an optimal Mixing equipment suitable for this method. Background technique: [0002] Water-absorbent resins have the property of absorbing a large amount of water and are used as materials for forming sanitary products such as disposable diapers, sanitary napkins and incontinence pads, soil water retaining agents, and food moisture-proof sheets. Especially for application to sanitary products such as disposab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/24B01F3/08B01F7/00B01F7/02B01F7/04B01F15/00C08J3/20C08L101/14
CPCB01F2215/0477B01F2215/0427B01F15/00844B01F2215/0422B01F3/0803Y10S526/93B01F2215/0472B01F7/022B01F7/00158B01F2215/0481B01F15/00863B01F3/0853B01F7/04B29B7/402B29B7/94B01F23/405B01F23/43B01F27/0726B01F27/62B01F27/70B01F35/512B01F35/52
Inventor 野木幸三笹部昌纯角永贤资入江好夫阪本繁三宅浩司
Owner NIPPON SHOKUBAI CO LTD
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