Preparation method of polyacrylic acid large-particle size bead-like water-absorbent resin

A technology of water-absorbent resin and polyacrylic acid, which is applied in the field of preparation of water-absorbent resin, can solve the problems of uncontrollable size, unevenness, and small particle size, and achieve the effect of controllable size and uniform particle size

Inactive Publication Date: 2014-02-26
QINGDAO SANLI BENNUO CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The aqueous solution polymerization method has short process, simple operation and low cost, but the product generally needs to be pulverized and post-processed, and regular bead-shaped particles cannot be obtained; the traditional reversed-phase suspension polymerization method needs mechanical stirring to prevent the monomer from agglomerating, and the obtained product also has The particle size is small, uneven, uncontrollable, and there is a problem of solvent recovery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1. Take 9 grams of acrylic acid, prepare an aqueous solution with a mass concentration of 18% with distilled water, weigh 5 grams of sodium hydroxide, prepare an aqueous solution with a mass concentration of 25% with distilled water, and add the sodium hydroxide solution dropwise to the acrylic acid solution Neutralize in medium, adjust the pH to 6, cool to 30°C, then weigh 30 grams of acrylamide and dissolve it in the neutralization solution to prepare a polymerization solution with a mass content of 42%, add 0.009 grams of ammonium persulfate, add 0.0072 grams N,N-methylenebisacrylamide, mix the system evenly, and adjust the temperature to 10°C;

[0020] 2. Weigh 25 grams of sucrose fatty acid calcium and 25 kilograms of white oil, mix them evenly, add them to the polymerization kettle, open the steam valve for heating, and raise the temperature to 86°C;

[0021] 3. Add the water phase to the oil phase for suspension polymerization and granulation. After the polymeriz...

Embodiment 2

[0023] 1. Take 9 grams of acrylic acid, prepare an aqueous solution with a mass concentration of 18% with distilled water, weigh 5 grams of sodium hydroxide, prepare an aqueous solution with a mass concentration of 25% with distilled water, and add the sodium hydroxide solution dropwise to the acrylic acid solution Neutralize in medium, adjust the pH to 6, cool to 29°C, then weigh 30 grams of acrylamide and dissolve it in the neutralization solution to prepare an aqueous solution with a mass content of 42%, add 0.012 grams of potassium persulfate, 0.009 grams of N, N-methylenebisacrylamide, mix the system evenly, and adjust the temperature to 11°C;

[0024] 2. Weigh 20 grams of sodium sucrose fatty acid and 25 kilograms of vegetable oil, mix them evenly, add them to the polymerization kettle, open the steam valve to heat, and raise the temperature to 88°C;

[0025] 3. Add the water phase to the oil phase for suspension polymerization and granulation. After the polymerization i...

Embodiment 3

[0027] 1. Take 9 grams of acrylic acid, prepare an aqueous solution with a mass concentration of 18% with distilled water, weigh 5 grams of sodium hydroxide, prepare an aqueous solution with a mass concentration of 25% with distilled water, and add the sodium hydroxide solution dropwise to the acrylic acid solution Neutralize in medium, adjust the pH to 6, cool to 28°C, then weigh 27 grams of acrylamide and dissolve it in the neutralization solution to prepare an aqueous solution with a mass content of 39%, add 0.016 grams of ammonium persulfate, 0.0054 grams of N, N-methylene bisacrylamide, 0.15 g of pigment, mix the system evenly, and adjust the temperature to 12°C;

[0028] 2. Weigh 15 grams of stearic acid and 25 kilograms of animal oil, mix them evenly, add them to the polymerization kettle, open the steam valve to heat, and raise the temperature to 85°C;

[0029] 3. Add the water phase to the oil phase for suspension polymerization and granulation. After the polymerizati...

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Abstract

The invention discloses a preparation method of polyacrylic acid large-particle size bead-like water-absorbent resin, which comprises the following steps: firstly neutralizing an acrylic acid monomer solution with sodium hydroxide alkaline liquor to obtain a pH value of 6-7, adding acrylamide, an oxidizing agent and a cross-linking agent, stirring for dissolving to obtain a water phase; adding a dispersant into a grease solution, stirring uniformly, heating to 85 DEG C-90 DEG C to obtain an oil phase; adding the water phase into the oil phase, performing suspension polymerization; after the polymerization, performing oil filtration, washing, drying and sieving to obtain the bead-like water-absorbent resin. The preparation method provided in the invention has no solvent recovery problem; by changing the component of the oil phase, the particle size is determined according to the surface tension of the water phase in the oil phase without stirring; therefore, polymerization of products with different particle sizes is realized; the obtained product has a uniform and controllable particle size, and the particle size is up to 10 mm.

Description

[0001] technical field [0002] The invention relates to a method for preparing a water-absorbing resin, in particular to a method for preparing a polyacrylic acid-based water-absorbing resin. [0003] Background technique [0004] Super Absorbent Polymer (SAP) is a new type of functional polymer material. It has many unique properties, not only the ability to absorb water hundreds or even thousands of times its own weight, but also fast water absorption, good water retention, large expansion force, strong gelling force, and strong thickening and viscosifying properties. Due to the cross-linked structure of macromolecules, it is difficult to separate water even under pressure, and it is elastic. Therefore, it is widely used in medical and health, industrial and agricultural production, civil construction, food industry, sewage treatment and other fields. [0005] At present, the synthesis methods of polyacrylic acid water-absorbing resin mainly include aqueous solution po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/06C08F2/18
Inventor 王晓丽王晓光陈锴
Owner QINGDAO SANLI BENNUO CHEM IND
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