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Preparation method of high-molecular water-absorbent resin

A polymer water-absorbing resin technology, applied in the production process of polymer water-absorbing resin, can solve the problems of complex production technology, unstable product quality, and restrictions on popularization and application, so as to improve the aggregate structure, ensure the ability to resist drought, reduce The effect of production costs

Inactive Publication Date: 2011-10-26
QINGDAO XINYAODI AGRI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the gel after its product absorbs water in the soil is too close to the plant root, and the root enters the gel and will be in contact with the gel, which will cause root rot, and due to the volume change of the water-absorbing resin, it may be cut off. The disadvantage of thin roots, and the price is relatively expensive, and the promotion and application in agriculture is limited
[0005] At present, the research and development of polymer water-absorbing resins in China started relatively late and is still in its infancy. Since the early 1980s, more than 20 scientific research institutes in my country have carried out research and development in the past 20 years, and some have been transferred to small batch production. However, due to complex production technology, unstable product quality, high cost and other factors, it is difficult to promote

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The preparation method of the polymer water-absorbent resin of the present embodiment includes the following contents:

[0027] (1) prepare NaOH aqueous solution: be that the NaOH 229g of 93% is dissolved in 600g water by concentration;

[0028] (2) Neutralization reaction: The prepared NaOH aqueous solution is continuously added to acrylic acid with a purity of 99.5%. The acrylic acid used: the specific gravity is 1.051 g / cm at 20°C 3 , the boiling point is 141.3°C, the flash point is 54.5°C; carry out neutralization reaction, the reaction time is 20 minutes; then cool down to 30°C;

[0029] (3) Graft copolymerization reaction: In the solution after the neutralization reaction, add 100g of starch at one time and stir at a speed of 120 rpm, then add 2g of methylenebisacrylamide crosslinking agent, and then add 2g of potassium persulfate catalyst , carry out graft copolymerization reaction, the temperature in the reaction process is controlled at 60 ℃, and the reaction ...

Embodiment 2

[0033] The preparation method of the polymer water-absorbent resin of the present embodiment includes the following contents:

[0034] (1) prepare NaOH aqueous solution: be that the NaOH 229g of 93% is dissolved in 600g water by concentration;

[0035] (2) Neutralization reaction: The prepared NaOH aqueous solution is continuously added to acrylic acid with a purity of 99.9%. The acrylic acid used: the specific gravity is 1.051 g / cm at 20°C 3 , the boiling point is 141.3°C, the flash point is 54.5°C; carry out neutralization reaction, the reaction time is 30 minutes; then cool down to 40°C;

[0036] (3) Graft copolymerization reaction: In the solution after the neutralization reaction, add 100g of starch at one time and stir at a speed of 80 rpm, then add 2g of methylenebisacrylamide crosslinking agent, and then add 2g of potassium persulfate catalyst , carry out graft copolymerization reaction, the temperature in the reaction process is controlled at 115 ℃, and the reaction ...

Embodiment 3

[0040] The preparation method of the polymer water-absorbent resin of the present embodiment includes the following contents:

[0041] (1) prepare NaOH aqueous solution: be that the NaOH 229g of 93% is dissolved in 600g water by concentration;

[0042] (2) Neutralization reaction: The prepared NaOH aqueous solution is continuously added to acrylic acid with a purity of 99.7%. The acrylic acid used: the specific gravity is 1.051 g / cm at 20°C 3 , with a boiling point of 141.3°C and a flash point of 54.5°C; carry out a neutralization reaction with a reaction time of 22 minutes; then cool down to 32°C;

[0043] (3) Graft copolymerization reaction: In the solution after the neutralization reaction, add 100g of starch at one time and stir at a speed of 90 rpm, then add 2g of methylenebisacrylamide crosslinking agent, and then add 2g of potassium persulfate catalyst , carry out graft copolymerization reaction, the temperature in the reaction process is controlled at 80 ℃, and the re...

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Abstract

The invention provides a preparation method of a high-molecular water-absorbent resin, which comprises the following five steps of NaOH solution preparation, neutralization reaction, graft copolymerization reaction, solidification drying, and pulverization; the invention has shortened process flow, decreased production time, reduced production cost, and thus the technical problems of long production period and high cost are solved. Meanwhile, no three wastes are generated during the production process; the production process causes no pollution to the environment, and is environment-friendly; and the product has stable quality.

Description

technical field [0001] The invention relates to a polymer water-absorbing resin, in particular to a production process of a polymer water-absorbing resin (SAP). Background technique [0002] Super Absorbent Polymer (English name is Super Absorbent Polymer, abbreviated as SAP) is a water-swellable polymer containing strong hydrophilic groups such as carboxyl groups and a certain degree of crosslinking. Compared with traditional water-absorbing materials such as sponge, cellulose, and silica gel, it is insoluble in water and organic solvents, but it has unique water absorption and water retention capabilities, and at the same time has the advantages of polymer materials. The polymer water-absorbent resin has a high water absorption capacity, which can reach more than a thousand times its own weight, and has strong water retention. It is not easy to lose water even under heat and pressure conditions. It has good stability to light, heat, acid and alkali, and has good biodegrad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/00C08F2/10
Inventor 朱彦芳
Owner QINGDAO XINYAODI AGRI TECH CO LTD
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