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Method for preparing palygorskite clay based salt-tolerance super water absorbency composite material

A technology of palygorskite clay and composite materials, applied in soil conditioning materials, chemical instruments and methods, organic fertilizers, etc., can solve problems such as high cost, harsh synthesis conditions, and restrictions on the wide application and popularization of superabsorbent materials

Inactive Publication Date: 2014-04-30
NORTHWEST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The synthesis conditions are relatively harsh, the synthesis process is complicated, and the cost is high, which limits the wide application and promotion of super absorbent materials.

Method used

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  • Method for preparing palygorskite clay based salt-tolerance super water absorbency composite material
  • Method for preparing palygorskite clay based salt-tolerance super water absorbency composite material
  • Method for preparing palygorskite clay based salt-tolerance super water absorbency composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Add 0.6 g PGS and 30 mL distilled water into a 100 mL three-neck flask, stir at 80 °C for 1 h; then add 2 g AMP and 0.02 g MBA, continue stirring for 40 min; then add 8 mL AA, continue stirring at 75 °C After 1 h, a gel was formed, left for 3 h (post-polymerization time), and cooled to room temperature. Take out the product and cut it into fragments with a length of 2-5 mm with scissors. Wash several times with distilled water to remove unreacted monomers, small molecules and oligomers, then use ethanol to remove water from the material, and vacuum dry at 60°C to constant weight to obtain PGS / P (AMPS-co-AA) High water absorption material, crushed through a 100-mesh sieve for water absorption test. The yield was about 81%, and the grafting rate was 76.9%.

[0049] The performance indicators are as follows:

[0050] Water absorption performance: absorbing distilled water is basically saturated in 50 minutes, and the maximum amount of distilled water absorbed is 750 g / g...

Embodiment 2

[0052] Add 0.9 g PGS and 40 mL distilled water into a 100 mL three-neck flask, stir the mixture at 60 °C for 1 h, then add 2 g AMP and 0.05 g MBA, continue stirring for 60 min, then add 8 mL AA, continue to stir at 60 °C After stirring for 50 min, a gel was produced, which was left for 2.5 h (post-polymerization time), and then the product was cooled to room temperature. Take out the product and cut it into fragments with a length of 2-5 mm with scissors. Afterwards, the product was washed several times with distilled water to remove unreacted monomers, small molecules and oligomers, and the water in the material was removed with ethanol, and vacuum-dried at 50°C to constant weight to obtain PGS / P (AMPS-co -AA) Super absorbent material, crushed through a 100-mesh sieve for water absorption test. The yield was about 73%, and the grafting rate was 69%.

[0053] The performance indicators are as follows:

[0054] Water absorption performance: absorbing distilled water is basic...

Embodiment 3

[0056] Add 0.4 g PGS and 30 mL distilled water into a 100 mL three-neck flask, stir the mixture at 70 °C for 1 h, then add 2 g AMP and 0.07 g MBA, continue stirring for 40 min, then add 10 mL AA, continue to stir at 70 °C After stirring for 1 h, a gel was formed, which was placed at 70 °C for 2 h (post-polymerization time), and then the product was cooled to room temperature. Take out the product and cut it into fragments with a length of 2-5 mm with scissors. The product was washed several times with distilled water to remove unreacted monomers, small molecules and oligomers, the water in the material was removed with ethanol, and vacuum dried at 70°C to constant weight to obtain PGS / P (AMPS-co-AA) High water absorption material, crushed through a 100-mesh sieve for water absorption test. The yield was about 89%, and the grafting rate was 72%.

[0057] The performance indicators are as follows:

[0058] Water absorption performance: absorbing distilled water is basically s...

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Abstract

The invention provides a method for preparing a palygorskite clay based salt-tolerance super water absorbency composite material, which belongs to the field of composite material preparation. The method comprises the following steps: in a water solution system, stirring palygorskite, 2-acrylamide-2-methyl propanesulfonic acid and acrylic acid as raw materials and N,N'-methylene bisacrylamide as a cross-linking agent at 60-80 DEG C for 2-6 hours to form a gel cross-linking product, cooling down, washing in water, dehydrating, drying and crushing to obtain the palygorskite clay based salt-tolerance super water absorbency composite material. The composite water absorbency material prepared by using the method is good in water absorbency, thermal resistance and salt tolerance, rapid in water absorbency velocity, is applicable to rapid absorbency of rain in a short time in dry and semidry areas, and is a drought-resisting water-retaining composite material with excellent properties. Compared with the prior art, the method is cheap and easy to obtain raw materials, simple in preparation process and green and environment-friendly, and has wide application prospects in such fields as agriculture, forestry, gardening, conservation of water and soil, drought resistance, water conservation and medicine release.

Description

technical field [0001] The invention belongs to the field of functional polymer materials, and relates to the preparation of a palygorskite clay superabsorbent composite material, in particular to a preparation method of a palygorskite clay-based salt-resistant superabsorbent composite material. Background technique [0002] Drought, water shortage and soil desertification are important factors restricting the sustainable development of agriculture in our country. According to statistics, the total area of ​​arid and semi-arid areas in my country is 4.55 million ha 2 , accounting for 47% of the total land area, of which the arid region in western my country accounts for 26.6% of the total land area, and the desertification area is 2 460 km 2 speed expansion. Therefore, soil and water conservation and drought resistance and water conservation have always been valued by scholars at home and abroad. Among them, using soil superabsorbent materials to achieve the purpose of sa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F292/00C08F220/06C08F220/58C08F222/38C08F2/10C09K17/20
Inventor 陆泉芳安宁孙勇俞洁庞二牛
Owner NORTHWEST NORMAL UNIVERSITY
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