High hydroscopicity resin production method

A technology of superabsorbent resin and manufacturing method, which is applied in the direction of absorbent pads, medical science, bandages, etc., can solve the problems of difficult control, cumbersome process, and high cost, and achieve the effects of simple process, easy reaction, and improved production efficiency

Active Publication Date: 2007-05-30
FORMOSA PLASTICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In view of the above problems, the main purpose of the present invention is to provide a method for continuous product

Method used

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  • High hydroscopicity resin production method

Examples

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Example Embodiment

[0063] Example one:

[0064] 1) A 300mm×400mm×800mm rectangular parallelepiped reaction tank, the other specifications and operation methods are the same as those described in items 1 to 10 of the scope of patent application. First, add 17.35kg of 49% sodium hydroxide aqueous solution and 30.52kg of water into the 100L reaction tank, then slowly add 22.53kg of acrylic acid to the sodium hydroxide aqueous solution under ice bath for neutralization; at this time, the monomer concentration is 38.6wt % Aqueous solution, of which 68% (molar ratio) of acrylic acid is partially neutralized to sodium acrylate.

[0065] 2) Add 33.80 g of glycerol polyethylene glycol triglycidyl ether (n=7) to the partially neutralized aqueous acrylic acid solution, and maintain the temperature at about 20°C.

[0066] 3) Using a quantitative pump (pump), the partially neutralized acrylic acid aqueous solution, L-ascorbic acid, sodium persulfate and 2.2-azobis(2-ylpropane) dihydrochloride mentioned in 1) are...

Example Embodiment

[0071] Example 2:

[0072] Repeat Example 1, but step 2) was changed to use 33.80g of glycerol polyethylene glycol triglycidyl ether (n=12). The rest are the same as Example 1. A super absorbent resin can be obtained, and the retention force is determined to be 32.48g / g, 20g / cm 2 Water absorption rate under pressure 30.24g / g, 49g / cm 2 The water absorption rate under pressure is 21.76g / g, and the residual monomer is 127ppm.

Example Embodiment

[0073] Example 3:

[0074] Repeat Example 1, but step 2) was changed to add 33.80g of glycerol polyethylene glycol triglycidyl ether (n=15), and the rest were the same as Example 1, to obtain a super absorbent resin, and the retention force was determined to be 33.73g / g , 20g / cm 2 Water absorption rate under pressure 32.78g / g, 49g / cm 2 The water absorption rate under pressure is 21.16g / g, and the residual monomer is 94ppm.

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Abstract

The invention discloses a making method of powder-shaped, insoluble, water, urine or blood absorbable, low-nonreacted monomer high-hydroscopicity resin, which comprises the following steps: feeding polybasic epoxy radical compound with high-hydrophilicity and long-chain with neutralizing rate over 50% and reacting starter protected by nitrogen in the reactor continuously; generating gel on the bottom of groove; starting sealed mechanism on the groove bottom; anchoring gel to move downwards through rod; cutting the gel; drying; grinding; sieving; coating surface crosslinking agent; heating surface at 90-230 deg.c.

Description

technical field [0001] The present invention relates to a kind of superabsorbent resin and its manufacturing method, especially a continuous production of powder, insoluble in water, capable of absorbing water, urine or blood, and having low residual unreacted monomer, high retention and high A method for producing a superabsorbent resin having a water absorption capacity under pressure. Background technique [0002] The superabsorbent resin has a strong water retention capacity, can absorb a hundred times or even a thousand times its own weight of water, and can swell after absorbing water, and maintain a non-flowing state, even if pressure is applied, it will not leak, and the absorbed water Can be released slowly in the atmosphere. Due to the above characteristics, it was first used as a soil water retaining agent in agriculture and forestry. In recent years, due to considerable progress in the production technology of superabsorbent resin, it is also widely used in sani...

Claims

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Application Information

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IPC IPC(8): C08F283/00C08J3/075A61L15/24
Inventor 施凯耀吴政璋黎元中
Owner FORMOSA PLASTICS CORP
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