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Organic-inorganic composite water-absorbing material based on polyaspartic acid and nano montmorillonite and preparation method thereof

A technology of polyaspartic acid and water-absorbing material, applied in the field of high-performance organic-inorganic composite water-absorbing material and its preparation, can solve the problems of poor ability to absorb electrolyte solution, poor compressive ability of polymer, decreased water-absorbing ability, etc. The effect of improving gel strength, excellent water retention performance and high water absorption rate

Inactive Publication Date: 2012-03-28
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its polymers often have disadvantages such as poor compression resistance, brittleness, reduced water absorption capacity under load-bearing conditions, and poor electrolyte solution absorption capacity, which seriously affects its application in various aspects.

Method used

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  • Organic-inorganic composite water-absorbing material based on polyaspartic acid and nano montmorillonite and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Disperse 2g of nano-montmorillonite in 20 times the mass of deionized water, stir at high speed for 0.5h to form a stable suspension, add 100g of L-aspartic acid, 25ml of 85% H 3 PO 4 Solution, 0.1g cross-linking agent Bis, ultrasonic dispersion, pass N 2 protection, and then raise the temperature to 200°C to react for 2 hours, then lower the temperature, wash with methanol and water until neutral, and dry to obtain the intermediate product.

[0040] The above intermediate product was crushed and hydrolyzed with NaOH (2mol / L) solution at about 50°C for 1-1.5h. The amount of NaOH was used to keep the pH of the final hydrolyzed solution between 10-12. Then neutralize with HCl, the degree of neutralization is 70-80%. Pour the neutralized hydrolyzate into a saturated solution of sodium chloride-methanol which is stirred vigorously for precipitation, filter, wash with methanol for several times, and store at a temperature of 40°C. Drying under the condition of blowing air ...

Embodiment 2

[0042] Disperse 5g of nano-montmorillonite in 20 times the mass of deionized water, stir at high speed for 0.5h to form a stable suspension, add 100g of L-aspartic acid, 25ml of 85% H 3 PO 4 Solution, 0.1g cross-linking agent Bis, ultrasonic dispersion, pass N 2 protection, and then raise the temperature to 200°C to react for 2 hours, then lower the temperature, wash with methanol and water until neutral, and dry to obtain the intermediate product.

[0043] The above intermediate product was crushed and hydrolyzed with NaOH (2mol / L) solution at about 50°C for 1-1.5h. The amount of NaOH was used to keep the pH of the final hydrolyzed solution between 10-12. Then neutralize with HCl, the degree of neutralization is 70-80%. Pour the neutralized hydrolyzate into a saturated solution of sodium chloride-methanol which is stirred vigorously for precipitation, filter, wash with methanol for several times, and store at a temperature of 40°C. Drying under the condition of blowing air ...

Embodiment 3

[0045] Disperse 8g of nano-montmorillonite in 20 times the mass of deionized water, stir at high speed for 0.5h to form a stable suspension, add 100g of L-aspartic acid, 25ml of 85% H 3 PO 4 Solution, 0.1g cross-linking agent Bis, ultrasonic dispersion, pass N 2 protection, and then raise the temperature to 200°C to react for 2 hours, then lower the temperature, wash with methanol and water until neutral, and dry to obtain the intermediate product.

[0046] The above intermediate product was crushed and hydrolyzed with NaOH (2mol / L) solution at about 50°C for 1-1.5h. The amount of NaOH was used to keep the pH of the final hydrolyzed solution between 10-12. Then neutralize with HCl, the degree of neutralization is 70-80%. Pour the neutralized hydrolyzate into a saturated solution of sodium chloride-methanol which is stirred vigorously for precipitation, filter, wash with methanol for several times, and store at a temperature of 40°C. Drying under the condition of blowing air ...

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Abstract

The invention relates to an organic-inorganic composite water-absorbing material based on polyaspartic acid and nano montmorillonite and a preparation method thereof. The preparation method of the composite material can be carried out by two modes such as an in-situ polymerization method and physical blending and modification. In the in-situ polymerization method, a product is prepared by carrying out in-situ polymerization on montmorillonite and L-aspartic acid of polyaspartic acid monomer, and comprises the following components in parts by weight: 100 parts of L-aspartic acid and 2-10 parts of nano montmorillonite. In the blending and modification of the polyaspartic acid / nano montmorillonite, the improvement on the mechanical performance of polyaspartic acid resin is realized by the modification action of the montmorillonite on the polyaspartic acid, and the obtained product comprises the following components in parts by weight: 100 parts of polyaspartic acid and 2-15 parts of nano montmorillonite. The high-performance polyaspartic acid / nano montmorillonite composite material provided by the invention has the advantages of convenience in preparation, excellent water-absorbing performance, high water-absorbing rate, strong repeated water-absorbing capability, good salt resistance and high impact resistance and the like, and can be used for the fields of high-molecular water-absorbing materials and sand fixing agents and the like.

Description

technical field [0001] The invention relates to a high-performance organic-inorganic composite water-absorbing material and a preparation method thereof, in particular to a polyaspartic acid composite water-absorbing material modified by nano-montmorillonite and a preparation method thereof. Background technique [0002] With the development of science and technology, the requirements for the application performance of polymer materials are increasing day by day. While people are constantly researching and developing new polymers, they are more focused on preparing composite materials with new functions by studying the modification of known polymer materials to meet the needs. Among them, the polymer / montmorillonite nanocomposite material is an emerging polymer-based inorganic nanocomposite material. Compared with conventional composite materials, it has less filler volume fraction, good thermal stability and dimensional stability, and high cost performance. advantage. Sin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G73/10C08K3/34C08L79/08C09K17/40C09K105/00
Inventor 余定华黄和杨冬青
Owner NANJING TECH UNIV
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