Preparation method for super-absorbent resin with sensitivity to pH value

A technology of superabsorbent resin and sensitive properties, applied in the field of functional polymer materials, can solve problems such as environmental pollution, resource waste, cost increase, etc., and achieve the effect of simple operation, easy realization, and reduced dosage

Inactive Publication Date: 2012-01-11
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is very effective when the molecular chain of the resin contains biodegradable segments, but when the molecular chain contains segments, groups or molecular structures that are not easily degradable

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] First prepare the pH-sensitive imine monomer, dissolve 4-allyloxybenzaldehyde (1.6g) in 15mL ethanol, add allylamine (0.6g), and react at room temperature for 2 hours to obtain pH-sensitive of monomers.

[0026] Acrylic acid (18 g) was dissolved in 100 mL of N,N-dimethylformamide (DMF), and 10 mL of 20% NaOH solution was added dropwise at low temperature. After the temperature was raised to room temperature, acrylamide (4.4 g) and the pH-sensitive monomer prepared above were added, stirred evenly, and 0.1 g of azobisisobutyronitrile was added, and reacted at 55° C. for 6 hours. After the reaction, the solvent was removed, the product was washed with water, then dried at 120° C. for 3 hours, and pulverized to obtain a pH-sensitive superabsorbent resin.

[0027] Under weakly alkaline conditions, it is used as a super absorbent resin. After use, adjust the pH value to about 6.5, and the resin can be degraded quickly. Wash it out with water. After recycling, adjust the pH ...

Embodiment 2

[0029] Firstly, pH-sensitive acylhydrazone monomers were prepared by dissolving acrolein (1.1 g) in 15 mL of ethanol, adding acrylohydrazide (1.2 g), and reacting at room temperature for 2 hours to obtain pH-sensitive monomers.

[0030] Acrylic acid (28.5g) was dissolved in 100mL of DMF, and 12mL of 20% NaOH solution was added dropwise at low temperature. After the temperature rises to room temperature, add acrylamide (10.6g) and the pH-sensitive monomer prepared above, stir well, then add N,N-methylenebisacrylamide (1.1g), azobisisobutyronitrile 0.15g, react at 55°C for 6 hours. After the reaction, the solvent was removed, the product was washed with water, then dried at 120° C. for 3 hours, and pulverized to obtain a pH-sensitive superabsorbent resin.

[0031] Under alkaline conditions, it is used as a superabsorbent resin. After use, adjust the pH value to about 6.0, and the resin can be degraded quickly. Wash it out with water. After recovery, adjust the pH value to 8.2, ...

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PUM

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Abstract

The invention discloses a preparation method for a super-absorbent resin with sensitivity to pH values. According to the method, groups with sensitivity to pH values are introduced into an absorbent resin system, and reversible fragmentation or combination of sensitive groups is controlled through adjusting pH values, thereby further controlling degradation/recovery of an absorbent resin. The advantages of the invention are as follows: controlling degradation of the super-absorbent resin by changing pH values enables convenient operation and is easy to realize; the changing of pH values of the system in a range of between weak acid and weak base does not cause obvious influence on surrounding environment in which the super-absorbent resin is used. The obtained product of super-absorbent resin is applicable to oil and gas field leak stopping agents, agricultural water retention corrosion inhibitors, soil amendments, packaging materials, daily absorbing articles, etc.

Description

technical field [0001] The invention relates to a preparation method of a superabsorbent resin with pH-sensitive properties, and belongs to the field of functional polymer materials. Background technique [0002] Superabsorbent resin is a new type of functional polymer material with a three-dimensional network structure that contains strong hydrophilic groups in its molecular structure and is moderately cross-linked. It can absorb water hundreds to thousands of times its own weight in a short period of time, and has strong water retention properties, and it is not easy to lose water even under pressure and heat. In addition, the superabsorbent resin also has the elasticity, plasticity, and mechanical properties of general polymer materials, and the properties of the resin can be adjusted through molecular design, and the product is easy to process. Due to these characteristics, superabsorbent resins show broad application prospects in the fields of agriculture, forestry, dr...

Claims

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Application Information

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IPC IPC(8): C08F220/06C08F220/56C08F226/02C08F220/60
Inventor 武元鹏林元华谢娟周莹朱红钧曾德智严仁田王其军
Owner SOUTHWEST PETROLEUM UNIV
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