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Preparation method of super absorbent polymer (SAP) with strong acid and alkali resistance

A technology of polymer water absorption, acid and alkali resistance, applied in chemical instruments and methods, applications, organic fertilizers, etc., can solve the problems of caking and water absorption ratios that are easily affected by soil pH, high product cost, and achieve faster water absorption. Strong resistance to acid and alkali, the effect of improving water absorption rate

Active Publication Date: 2016-10-12
JINAN YONGSHENG CHEM
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, at present, there are certain difficulties in the application of superabsorbent resins in agriculture. For example, the product cost is high; the problems of water-absorbent resin itself, such as "bridging and accumulation", agglomeration and water absorption times are easily affected by soil pH, need to be solved urgently.

Method used

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  • Preparation method of super absorbent polymer (SAP) with strong acid and alkali resistance
  • Preparation method of super absorbent polymer (SAP) with strong acid and alkali resistance
  • Preparation method of super absorbent polymer (SAP) with strong acid and alkali resistance

Examples

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Embodiment 1

[0029] Embodiment 1. A preparation method of a high-molecular water-absorbing resin with strong acid and alkali resistance, the steps are as follows,

[0030] 50g acrylic acid is put into the 500ml reaction bottle that fills 300g water, add 50g potassium carbonate (K 2 CO 3 ) After the neutralization reaction is completed, the pH value reaches 6.8-7.2, and then 70g of acrylamide is added, stirred evenly and completely dissolved, and the measured pH value should be 7.0±0.1. Add 0.06 g of cross-linking agent hexamethylenetetramine under stirring, then add 2.38 g of phosphate buffer (2.04 g of potassium dihydrogen phosphate, 0.34 g of sodium hydroxide), then add 3 g of calcium carbonate, and stir evenly. Add 0.02g of sodium sulfite, stir evenly, and then add 0.02g of crosslinking agent. Blow nitrogen gas at 0-30°C for 0.5 hours to remove dissolved oxygen, and measure the dissolved oxygen in the system to be ≤0.01mg / L. If not, 0.02g of sodium sulfite can be added to further abs...

Embodiment 2

[0031] Embodiment 2. A preparation method of a polymer water-absorbent resin with strong acid and alkali resistance, the steps are as follows,

[0032] 30g acrylic acid is put into the 500ml reaction bottle that fills 300g water, add 30g potassium carbonate (K 2 CO 3 ) After the neutralization reaction is completed, the pH value reaches 6.8-7.2, then add 50g of acrylamide, stir evenly and dissolve completely, and the measured pH value should be 7.0±0.1. Add 0.04 g of cross-linking agent hexamethylenetetramine under stirring, then add 2.38 g of phosphate buffer (2.04 g of potassium dihydrogen phosphate, 0.34 g of sodium hydroxide), then add 4 g of starch, and stir evenly. Add 0.02g of sodium sulfite, stir evenly, and then add 0.02g of crosslinking agent. Blow nitrogen gas at 0-30°C for 0.5 hours to remove dissolved oxygen, and measure the dissolved oxygen in the system to be ≤0.01mg / L. If not, 0.02g of sodium sulfite can be added to further absorb dissolved oxygen. After 10...

Embodiment 3

[0033] Embodiment 3. A preparation method of a polymer water-absorbent resin with strong acid and alkali resistance, the steps are as follows,

[0034] 40g acrylic acid is put into the 500ml reaction bottle that fills 300g water, add 40g potassium carbonate (K 2 CO 3) After the neutralization reaction is completed, the pH value reaches 6.8-7.2, and then 60g of acrylamide is added, stirred evenly and completely dissolved, and the measured pH value should be 7.0±0.1. Add 0.05 g of cross-linking agent hexamethylenetetramine under stirring, then add 2.68 g of citric acid buffer (0.33 g of citric acid, 2.35 g of disodium hydrogen phosphate), then add 5 g of bentonite, and stir evenly. Add 0.02g of sodium sulfite, stir evenly, and then add 0.02g of crosslinking agent. Blow nitrogen gas at 0-30°C for 0.5 hours to remove dissolved oxygen, and measure the dissolved oxygen in the system to be ≤0.01mg / L. If not, 0.02g of sodium sulfite can be added to further absorb dissolved oxygen. ...

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Abstract

The invention provides a preparation method of super absorbent polymer with strong acid and alkali resistance. The preparation method comprises the steps that acrylic acid and equivalent potassium carbonate are neutralized to generate acrylic acid potassium salt, and then acrylamide is added; after acrylamide is completely dissolved, a cross-linking agent, buffering agents and pore-foaming agents are added and stirred uniformly; sodium sulfite is added and stirred uniformly, and then the cross-linking agent is added; nitrogen is blown to remove oxygen until the oxygen content of a system is not more than 0.1 mg / L at the temperature of 0 to 30 DEG C; the temperature is lowered to 10 DEG C, an initiator is added, the nitrogen is continuously blown to be in a sticky state, and polymerization is carried out for 2 hours to form a polymer gel block; the polymer gel block is subjected to extruding granulation, dried, crushed and sieved to form products with different particle sizes. The super absorbent polymer disclosed by the invention is polymerized in a buffer solution system, and has the advantages of strong acid and alkali resistance, high water absorption speed and the like.

Description

technical field [0001] The invention relates to a preparation method of a high-molecular water-absorbing resin with strong acid and alkali resistance, and belongs to the field of chemical industry. Background technique [0002] Water-absorbing resin (Super Absorbent Polymer, SAP) is a new type of functional polymer material. It has a high water absorption function of absorbing water hundreds to thousands of times heavier than itself, and has excellent water retention performance. Once it absorbs water and swells into a hydrogel, it is difficult to separate the water even if it is pressurized. Superabsorbent resin is a functional polymer material with a large number of hydrophilic groups. With its high liquid absorption capacity, high liquid absorption speed and high liquid retention capacity, it is widely used in sanitary products, such as women's sanitary napkins, diapers, adult multi-functional nursing pads, absorbent paper, pet pads, etc. This kind of product is greatly...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F220/06C08F4/40C08F2/38C08F2/44C08K3/26C08K3/34C08K3/22C08L33/26C08L3/02C09K17/40C09K17/20C09K17/32
CPCC08F2/38C08F2/44C08F4/40C08F220/56C08K3/22C08K3/26C08K3/346C08K2003/2227C08K2003/265C08L33/26C09K17/20C09K17/32C09K17/40C09K2101/00C08F220/06C08L3/02
Inventor 许振举薛秀英许广玉胡启珠陆兴倩王学环
Owner JINAN YONGSHENG CHEM
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