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High temp. and salt resistant water absorbing resin

A water-absorbent resin, temperature-resistant and salt-resistant technology, which is applied in the field of polymer material preparation, can solve the problems of high cost, unsuitability, poor salt and temperature resistance, etc., and achieves the effect of safe use and reduced production cost.

Inactive Publication Date: 2004-12-22
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The water-absorbent resins synthesized by the first three types in the above systems have high water absorption multiples and fast speeds, but have poor salt and temperature resistance and high cost, and are not suitable for large-dose applications such as agriculture, forestry, horticulture, and oil recovery.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Add 5.32 grams of sodium hydroxide to 120 grams of 11% acrylic acid solution for neutralization to make a sodium acrylate solution, then add 39 grams of acrylamide and 3 grams of dimethyl diallyl ammonium chloride, stir well, and then add 50 grams of kaolin, after stirring evenly, fill with nitrogen, 10 minutes later, add cross-linking agent, oxidizing agent, reducing agent and FB auxiliary agent, fill with nitrogen for a few minutes, stop filling with nitrogen, after half an hour to 4 hours, The solution gradually thickened to a gel, and the reaction was completed. The rubber block is granulated by a granulator to form a certain particle size, dried and pulverized to become a product.

Embodiment 2

[0021] Add 2 grams of potassium hydroxide to 50 grams of 10% acrylic acid solution to make a potassium acrylate solution, then add 9 grams of acrylamide and 2 grams of diethyldiallylamine chloride, stir well, and then add 20 grams of Bentonite inorganic filler, after stirring evenly, fill with nitrogen, 20 minutes later, add cross-linking agent, oxidizing agent, reducing agent and FB auxiliary agent, fill with nitrogen for a few minutes, stop filling nitrogen, half an hour later, the solution gradually increases After 4 hours, the solution was in the form of gelatinous lumps, and the reaction was completed. The rubber block is granulated with a granulator, dried, crushed and sieved to become a product.

Embodiment 3

[0023] Add 34.65 grams of sodium carbonate to 225 grams of 10% acrylic acid solution to make an acrylate solution, then add 80ml (40%) acrylamide and 3 grams of dimethyl diallyl ammonium chloride, stir well, and then add 50 grams of activated clay, stirred evenly, filled with nitrogen, 30 minutes later, added cross-linking agent, oxidizing agent, reducing agent and FB auxiliary agent, filled with nitrogen for a few minutes, then stopped filling nitrogen, half an hour later, the solution gradually increased After 4 hours, the solution was in the form of gelatinous lumps, and the reaction was completed. The rubber block is granulated with a granulator, dried, pulverized and sieved to become a product.

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PUM

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Abstract

The heat resistant and salt resistant hydroscopic resin consists of ternary copolymer of acrylic acid, acrylamide and cation monomers and laminated inorganic stuffing in the amount of 10-150 wt% of total monomer. It may be used in the conditions of 70-150 deg.c and mineralization degree 5000-100000 ppm to maintain no shrinkage and no structure damage for long period. When being used as water plugging agent, it is safe, pollution-less, non-toxic and long in effect. The heat resistant and salt resistant hydroscopic resin as one novel composite material is mainly used for hydroscopic expansion use with harsh condition, such as water blocking and oil displacement regulation in high temperature and high salinity petroleum deposit and blocking in building. In addition, it may be also used in sanitary towel and agricultural and forestry water maintaining engineering in lower production cost.

Description

[0001] Involved areas: [0002] The invention belongs to the field of polymer material preparation, in particular to a temperature-resistant and salt-resistant water-absorbing resin. Background technique: [0003] In the existing relevant background technology, the production of superabsorbent materials by the aqueous solution method mainly includes the following categories: [0004] 1) Pure acrylic acid homopolymerization crosslinking system, such as: EP349241, EP347241, US4921904; [0005] 2) Graft copolymerization and crosslinking system of acrylic acid plus starch or cellulose, such as: CN1258686A, CN1258686A; [0006] 3) Acrylic acid and acrylamide copolymerization crosslinking system, such as: CN125082A. US4525527; [0007] 4) Homopolymerization of acrylic acid with a small amount of activated kaolin, such as: CN1080642A; [0008] 5) Homopolymerization of acrylamide plus a certain amount of bentonite, aqueous solution radiation method, CN85102156. [0009] The water...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08K3/26C08L33/26
Inventor 李芮丽赵振兴周正刚韩桂华
Owner PETROCHINA CO LTD
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