Hydrophilia-wrapped water-absorbent resin microsphere and preparation method thereof

A water-absorbent resin and hydrophilic technology, applied in the coating and other directions, can solve the problems of affecting the performance of cement slurry, non-dispersion of water-absorbent resin, etc., and achieve the effects of easy operation, slow water absorption rate, and easy dispersion.

Active Publication Date: 2013-11-27
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the past, polyethylene or other lipophilic polymers were used to wrap the water-absorbent resin, but this kind of wrapping method is easy to make the wrapped water-absorbent resin not dispersed in the cement slurry, which affects the performance of the cement slurry

Method used

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  • Hydrophilia-wrapped water-absorbent resin microsphere and preparation method thereof
  • Hydrophilia-wrapped water-absorbent resin microsphere and preparation method thereof
  • Hydrophilia-wrapped water-absorbent resin microsphere and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Use a 100mL volumetric flask to prepare an aqueous solution of acetic acid with a mass concentration of 3%, pour it into a 500mL three-necked bottle, slowly add 1.5g of chitosan powder (deacetylation degree 90%, molecular weight 200,000), stir and dissolve, then add 3g polyacrylamide to absorb water Resin microspheres, stirred for 10min, added 2.5g CaCO 3 , then add 20g of absolute ethanol dropwise, filter out the microspheres, put them into a three-neck flask filled with 60g of toluene (dissolving Span-80 with a mass concentration of 0.5%), place them in a 60°C water bath and stir for 5min, then drop Add 6 g of glutaraldehyde solution with a mass concentration of 12.5%, stir and react for 4 hours, then filter, dry the microspheres in a 50°C incubator, and record the encapsulated microspheres as sample 1.

Embodiment 2

[0028] Use a 100mL volumetric flask to prepare an aqueous acetic acid solution with a mass concentration of 4%, pour it into a 500mL three-necked bottle, slowly add 2g of chitosan powder (deacetylation degree 92%, molecular weight 150,000), stir and dissolve, then add 4.5g polyacrylamide to absorb water Resin microspheres, stirred for 10min, added 3g CaCO 3 , then add 20g of absolute ethanol dropwise, filter out the microspheres, put them into a three-necked bottle filled with 90g of toluene (dissolved with Tween-80 with a mass concentration of 0.6%), place them in a water bath at 65°C and stir for 5min, then drop Add 6 g of glutaraldehyde solution with a mass concentration of 10%, stir and react for 4 hours, then filter, dry the microspheres in a constant temperature oven at 50°C, and record the obtained wrapped microspheres as sample 2.

Embodiment 3

[0030] Use a 100mL volumetric flask to prepare an aqueous acetic acid solution with a mass concentration of 2.0%, pour it into a 500mL three-neck bottle, slowly add 1.5g of chitosan powder (deacetylation degree 90%, molecular weight 200,000), stir and dissolve, then add 3g of polyacrylic acid water-absorbing resin Microspheres, stirred for 10min, added 1g CaCO 3 , and then dropwise added 15g of absolute ethanol, filtered out the microspheres, added them into a three-neck flask filled with 75g of toluene (dissolving Span-60 with a mass concentration of 0.5%), placed them in a 60°C water bath and stirred for 5min, then dropped Add 4 g of glutaraldehyde solution with a mass concentration of 10%, stir and react for 5 hours, then filter, dry the microspheres in a 50°C incubator, and record the encapsulated microspheres as sample 3.

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Abstract

The invention discloses a preparation method of a hydrophilia-wrapped water-absorbent resin microsphere, which comprises the following steps: adding the water-absorbent resin microsphere in acetic acid water solution dissolved with chitosan; adding calcium carbonate (CaCO3) after stirring and dispersing uniformly; then adding absolute alcohol dropwise and slowly; filtering out water-absorbent resin microsphere being subjected to primary treatment after the dropwise adding is finished; adding the water-absorbent resin microsphere being subjected to the primary treatment to toluene dissolved with dispersing agent; dropwise adding glutaraldehyde solution with the mass concentration of 5% to 15%; heating and reacting for 3-6 hours in water bath at the temperature of 50 DEG C to 80 DEG C; and filtering and drying to obtain the hydrophilia-wrapped water-absorbent resin microsphere. The method can effectively controls the initial water absorption rate of the water-absorbent resin microsphere, and can use the hydrophilia-wrapped water-absorbent resin microsphere in cement slurry to realize the water swelling of the resin to block cracks when penetration of formation water caused by zonal isolation due to the situation that microcracks or microgaps occur in set cement .

Description

technical field [0001] The invention relates to a water-absorbing resin microsphere, in particular to a hydrophilic-wrapped water-absorbing resin microsphere and a preparation method thereof. The invention belongs to the technical field of functional polymer microsphere encapsulation. Background technique [0002] Water-absorbing resin is added to the cement mortar as an additive. When micro-cracks or micro-gaps are generated inside the cement stone and the interlayer seal fails, formation water will seep in. At this time, the resin will absorb water and swell to block the cracks, thus creating The ring failure layer acts as a physical seal. However, the initial water absorption rate of water-absorbent resin in cement slurry is fast, and the water absorption capacity is large, which has a great impact on the performance of cement slurry and cannot meet the needs of cementing sites. Therefore, in order to realize the application of water-absorbent resin in cement slurry, how...

Claims

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Application Information

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IPC IPC(8): C08J7/04C08L33/26C08L33/02C04B24/12C04B24/26
Inventor 柳华杰步玉环郭胜来沈兆超
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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