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One-step continuous granulation preparation method for water absorbent granule

A water-absorbing agent and granule technology, which is applied in the field of one-step continuous granulation of water-absorbing agent granules, can solve the problems of uneven particle size and long drying time, achieve uniform particle size distribution, increase particle size, and facilitate process scale-up Effect

Active Publication Date: 2012-03-21
WUHAN LICHENG BIOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation method has large particle size, uniform particle size distribution, and is not easy to agglomerate under high-humidity conditions, which solves the problems that most of the particles are powdery, uneven particle size, and long drying time in the traditional aqueous solution method.

Method used

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  • One-step continuous granulation preparation method for water absorbent granule
  • One-step continuous granulation preparation method for water absorbent granule
  • One-step continuous granulation preparation method for water absorbent granule

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0049] A kind of water absorbing agent particles, which are composed of the following materials with the following mass ratios:

[0050] Raw material mass ratio%

[0051] Polysaccharide Konjac Glucomannan 0.9%

[0052] Xanthan gum 0.1%

[0053] Monomer acrylic acid 98.14%

[0054] Initiator Potassium persulfate 0.1%

[0055] Crosslinking agent Primary crosslinking agent Alumina 0.6%

[0056] Secondary crosslinking agent N, N-methylene bisacrylamide 0.16%

[0057] Note: The monomer is a monomer compound (sodium acrylate) partially neutralized by a neutralizing alkali (sodium hydroxide), and the degree of neutralization is 80 mol% (that is, the molar ratio of sodium acrylate to acrylic acid in the monomer is 80:20);

[0058] Obtained as a granular product with a particle size of 2.5mm, the product has a water absorption rate of 1000 times for pure water and 90 times for physiological saline.

[0059] A preparation method of one-step continuous granulation of water-absorbing age...

example 2

[0065] A kind of water absorbing agent particles, which are composed of raw materials with the following mass ratios:

[0066] Raw material mass ratio%

[0067] Polysaccharide starch 2%

[0068] Monomer acrylic acid 95.8%

[0069] Initiator Ammonium persulfate 0.15%

[0070] Crosslinking agent Primary crosslinking agent N,N-methylenebisacrylamide 0.05%

[0071] Secondary crosslinking agent Epichlorohydrin 2%

[0072] Note: The monomer is a monomer compound (potassium acrylate) partially neutralized by a neutralizing base (potassium hydroxide), and the neutralization degree is 50 mol% (that is, the molar ratio of potassium acrylate to acrylic acid in the monomer is 50:50);

[0073] A granular product with a particle size of 1.5 mm was obtained. The product has a water absorption rate of 400 times for pure water and 50 times for normal saline.

[0074] A preparation method for one-step continuous granulation of water absorbing agent particles, which comprises the following steps:

[0...

example 3

[0080] A kind of water absorbing agent particles, which are composed of raw materials with the following mass ratios:

[0081] Raw material mass ratio%

[0082] Polysaccharides Seaweed 9%

[0083] Monomer Methacrylic acid 77.5%

[0084] Styrene sulfonic acid 8.75%

[0085] Initiator sodium persulfate 0.15%

[0086] Crosslinking agent Primary crosslinking agent Epichlorohydrin 0.1%

[0087] Secondary crosslinking agent 4.5% alumina

[0088] Note: The monomer is a monomer compound (ammonium methacrylate, ammonium styrene sulfonate) partially neutralized by neutralizing alkali (aqueous ammonia), and the degree of neutralization is 70 mol% (that is, ammonium methacrylate, methacrylic acid in the monomer The molar ratio of styrene sulfonic acid is 70:30, and the molar ratio of ammonium styrene sulfonate to styrene sulfonic acid is 70:30);

[0089] A granular product with a particle size of 3 mm was obtained. The product absorbs 600 times of pure water and 70 times of normal sal...

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Abstract

The invention discloses a one-step continuous granulation preparation method for a water absorbent granule, and the water absorbent granule consists of polysaccharide, monomer, initiator and cross-linking agents according to a certain proportion by weight. The method includes the following steps: (A) the polysaccharide and the primary cross-linking agent are added into a reactor and uniformly mixed under the condition of nitrogen protection until dissolution, the initiator and the monomer partially neutralized neutralizing alkali are added, and the temperature is controlled to initiate graft copolymerization reaction; (B) the secondary cross-linking agent is added, and after the reaction solution is uniformly mixed, granulation is fulfilled; (C) dispersion medium is filtered, the granulesare transferred into washing reagent, and the residual dispersion medium on the surfaces of the granules is washed off with the washing reagent; (D) the washing reagent is filtered, and a heating fanis used for removing the residual washing reagent on the surfaces of the granules; (E) the water absorbent granules are obtained. The method is easy, and is simple and convenient to operate. The water absorbent granules cannot be easily caked under the high-humidity condition, and the invention solves the problems that: in the conventional aqueous solution method for preparation, the granules aremostly powdery, the grain size is ununiform, and the drying time is overlong. The one-step continuous granulation preparation method is suitable for mass production.

Description

Technical field [0001] The invention relates to a preparation method for one-step continuous granulation of water absorbing agent particles. The particles can be widely used in sanitary materials, food, products, moisture-proof, and landscaping. Background technique [0002] Currently, there are two main methods for synthesizing superabsorbent particles; one is reversed-phase suspension polymerization, and the other is aqueous solution polymerization and then pulverized and dried and then combined to form. Suspension polymerization is synthesized by dispersing monomers, dispersants and other substances into the dispersed phase by stirring and high-speed shearing, adding initiators to initiate the graft copolymerization reaction, and obtaining by the progress of the synthesis particle reaction to increase and gradually settle Water absorbent particles. The advantage of this method is that the particle shape is better and the particle size distribution is relatively concentrated....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/00C08F220/06C08F212/14C08F228/02C08F220/56C08J3/24
Inventor 姜发堂
Owner WUHAN LICHENG BIOTECH
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