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Dilatation-retardant water-absorbent resin and preparation method thereof

A water-absorbent resin and slow-swelling technology, applied in the field of resin, can solve the problems of large specific surface area, small particle size of water-absorbent resin, and impracticality, and achieve the effect of strong operability and simple steps

Active Publication Date: 2013-03-27
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there are two methods to realize the slow expansion of water-absorbent resins: 1. Introducing hydrophobic groups during the synthesis process to achieve the purpose of delaying expansion. It has technical practicability; 2. Surface modification of water-absorbing resin, for example, the surface of resin can be hydrophobically modified by plasma method. This method is not perfect in technology development, needs further optimization, and is not practical; moreover, the above-mentioned Both methods, due to the introduction of hydrophobic groups or surface hydrophobic modification, will greatly reduce the water absorption rate of the water-absorbent resin

Method used

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  • Dilatation-retardant water-absorbent resin and preparation method thereof

Examples

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Effect test

Embodiment 1

[0029] Add 77g of distilled water, 12g of monomeric acrylic acid, 12g of acrylamide, and 0.8g of cross-linking agent N,N'-methylene bisacrylamide in turn under stirring in the reaction vessel. In a water bath, add 0.5 g of initiator ammonium persulfate, and react for 30 minutes to obtain a solid gel block product, which is dried, pulverized, and granulated to obtain a powdery conventional water-absorbent resin A.

Embodiment 2

[0031] Add 3g of gum arabic and 3g of polyethylene glycol into 94g of water, fully dissolve, and then use the aqueous solution dissolved in gum arabic and polyethylene glycol as a spray liquid to fluidize and spray the self-made conventional water-absorbent resin A, fluidize The bed spraying temperature is 40°C, and the atomization pressure of the fluidized bed spraying is 1.2 bar. When the weight of the water-absorbent resin increases by 10%, the coating is stopped to obtain the slow-swelling water-absorbent resin B.

Embodiment 3

[0033] With 3g hydroxypropyl methylcellulose and 1.5g povidone, join in 95.5g ethanol (95% of ethanol concentration), after fully dissolving, then use the ethanol that dissolves hydroxypropyl methylcellulose and povidone The solution is used as a spraying liquid, and the self-made conventional water-absorbing resin A is fluidized and sprayed. The temperature of the fluidized bed spraying is 25 ° C, and the atomization pressure of the fluidized bed spraying is 0.7 bar. When the weight of the water-absorbing resin increases by 32%, stop the coating Cover to obtain slow-swelling water-absorbent resin C.

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Abstract

The invention relates to a dilatation-retardant water-absorbent resin which comprises a water-absorbent resin and a coating layer, wherein the water-absorbent resin is used as a capsule core; the coating layer is coated outside the water-absorbent resin; and the coating layer contains a film-forming material and a pore-foaming agent. The invention also provides a preparation method of the dilatation-retardant water-absorbent resin. The dilatation-retardant water-absorbent resin disclosed by the invention is molten, fused or damaged on the coating layer by gradually stretching to crack granules through the extending force of the inside water-absorbent resin without external conditions, thereby enlarging the selection range of the film-forming material and the application range of the dilatation-retardant water-absorbent resin.

Description

technical field [0001] The present application relates to a resin, in particular to a slow-swelling water-absorbing resin, and also to a preparation method of the slow-swelling water-absorbing resin. Background technique [0002] The water-absorbing resin has good water-absorbing swelling characteristics, good fluidity and deformability, and is easy to form effective plugging in the near-well zone. Therefore, it plays an important role in oilfield plugging, profile control, and water plugging operations, and has achieved good results in field applications in most oilfields in China. [0003] However, due to the common high initial water absorption rate of water-absorbent resins, the injection process expands rapidly, and it is easy to accumulate near the wellbore, resulting in a rapid increase in injection pressure and even plugging the construction string. In addition, the strength of the water-absorbent resin decreases after absorbing water, and it is easy to break during...

Claims

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Application Information

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IPC IPC(8): C08J7/04C08L101/14B01J13/02
Inventor 陈缘博苗海龙徐博韬李自立段连超赵志强李怀科郁鲁彬
Owner CHINA NAT OFFSHORE OIL CORP
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