A salt-resistant superabsorbent resin

A technology of superabsorbent resin and salt resistance, applied in the field of functional polymer materials, can solve problems such as difficult to control product structure distribution, difficult to obtain, high polymer molecular weight, etc., to save preparation costs, increase osmotic pressure difference, The effect of improving salt tolerance

Active Publication Date: 2017-07-21
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a salt-tolerant superabsorbent resin and its preparation method in order to solve the shortcomings of the traditional salt-resistant superabsorbent resin, such as the difficulty in controlling the product structure distribution and the difficulty in obtaining a higher polymer molecular weight.

Method used

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  • A salt-resistant superabsorbent resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1) Dissolve 6.0 g of sodium polyacrylate, 2.5 g of poly-N-vinylpyrrolidone and 1.5 g of polyvinylsulfonic acid in 190 g of water, and dissolve them completely under stirring to obtain mixed solution A.

[0025] 2) 0.09g of crosslinking agent 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide and 0.9g of sodium chloride were dissolved in 29.01 g of water to obtain mixed solution B; step 1) The obtained mixed solution A and mixed solution B were added to 230 g of oil phase castor oil, and 1.15 g of emulsifier Tween-80 was added at the same time, and the mixture was stirred and reacted at a speed of 300 rpm at 60° C. for 5 hours.

[0026] 3) Finally, add precipitant ethanol to the reaction system to precipitate the product, filter, wash and filter the product with precipitant ethanol, filter again and dry to obtain the final product.

Embodiment 2

[0028] 1) Dissolve 8.0g of sodium polyacrylate, 4.8g of polyacrylamide and 3.2g of poly-2-hydroxy-3-acryloyloxypropanesulfonate potassium in 184g of water, and dissolve it completely under stirring , to obtain mixed solution A.

[0029] 2) Dissolve 0.2 g of crosslinking agent epichlorohydrin and 1.0 g of sodium sulfate in 18.8 g of water to obtain mixed solution B; add mixed solution A and mixed solution B obtained in step 1) to 330 g of oil phase paraffin oil , while adding 3.3 g of emulsifier sodium dodecylsulfonate, stirring and reacting at 50° C. at a speed of 200 rpm for 3 hours.

[0030] 3) Finally, a precipitant acetone is added to the reaction system to precipitate the product, filtered, and the filtered product is washed with the precipitant acetone, filtered again and dried to obtain the final product.

Embodiment 3

[0032] 1) Dissolve 22.5 g of polyglutamic acid, 9.0 g of poly N-vinyl caprolactam and 13.5 g of polyvinyl phosphoric acid in 255 g of water, and dissolve them completely under stirring to obtain mixed solution A.

[0033] 2) Dissolve 2.0 g of crosslinking agent aluminum chloride and 1.2 g of sodium phosphate in 16.8 g of water to obtain mixed solution B; add mixed solution A and mixed solution B obtained in step 1) to 747 g of oil phase rapeseed oil , while adding 24.9 g of emulsifier lecithin, stirring and reacting at a speed of 500 rpm at 60° C. for 1 hour.

[0034] 3) Finally, add precipitant isopropanol to the reaction system to precipitate the product, filter, wash and filter the product with precipitant isopropanol, filter again and dry to obtain the final product.

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Abstract

The invention relates to salt tolerance super water-absorbent resin, and belongs to the field of functional high polymer materials. According to the obtained super water-absorbent resin, firstly, after a monomer containing carboxyl, a non-ionizing monomer and a super-hydrophilic monomer are aggregated into linear molecules respectively, internal crosslinking is performed in emulsion liquid drops to obtain the salt tolerance super water-absorbent resin. According to the method, the polymers have the controllable polymerization degree, and beneficial assistance is provided for improving the hydrophilic performance. The content of hydrophile groups and the content of salt tolerance groups are convenient to control, and the salt tolerance of the resin is improved. In the crosslinking process, sodium salt is added, the osmotic pressure difference between the interior and the exterior of a net can be further increased when the resin makes contact with water, and the salt tolerance is further improved. According to the preparation method, the problems that super water-absorbent resin obtained through a solution polymerization method is large in heat release and the product structure is hard to control are solved, the technology is simple, energy consumption is lowered, the preparation cost is saved, and the reliability, stability and salt tolerance of the product structure are improved.

Description

technical field [0001] The invention relates to a salt-resistant superabsorbent resin, which belongs to the field of functional polymer materials. Background technique [0002] Superabsorbent resin is a new type of functional polymer material that has developed rapidly in recent years. It is a network polymer with strong hydrophilic groups such as carboxyl and hydroxyl groups and a certain degree of crosslinking. It is insoluble in water and organic solvents, and can absorb hundreds or even thousands of times its own weight. water, and the gel formed after absorbing water and swelling has good water retention and weather resistance. Therefore, it is widely used as soil improver for agriculture, forestry, gardening, etc., sanitary product materials, industrial dehydrating agent, fresh-keeping agent, anti-fogging agent, medical material, hydrogel material, etc. [0003] The current superabsorbent resin products are mainly obtained through partial neutralization of acrylic ac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L33/02C08L39/06C08L41/00C08L33/14C08L43/02C08L5/08C08L77/02C08L77/04C08K5/29C08K5/1515C08K3/16C08K3/32C08J3/24C08J3/03
Inventor 陈煜
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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