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High temp. and salt resistant water absorbing resin

A water-absorbent resin, temperature-resistant and salt-resistant technology, applied in the field of polymer material preparation, can solve the problems of high cost, unsuitability, poor salt and temperature resistance, etc., and achieve the effect of reducing production cost and using safety.

Inactive Publication Date: 2003-12-31
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

[0020] 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 dimethyldiallyl amine chloride, Stir well, then add 50 grams of kaolin, after stirring well, fill with nitrogen, after 10 minutes, add crosslinking agent, oxidant, reducing agent and FB auxiliary, fill with nitrogen for a few minutes, stop filling with nitrogen, half an hour After 4 hours, the solution gradually thickened to a lump, 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

[0022] Add 2 grams of potassium hydroxide to 50 grams of 10% acrylic acid solution to make 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, after 20 minutes, add cross-linking agent, oxidant, reducing agent and FB auxiliary, fill with nitrogen for a few minutes, stop filling with nitrogen, half an hour After 4 hours, the solution was gradually thickened, and the solution was in the form of a lump, and the reaction was completed. The rubber block is granulated by a granulator, dried, crushed and screened to become the product.

Embodiment 3

[0024] Add 3465 grams of sodium carbonate to 225 grams of 10% acrylic acid solution to make an acrylic acid salt solution, then add 80 ml (40%) of acrylamide, 3 grams of dimethyldiallyl amine chloride, and stir After homogeneous, add 50 grams of activated clay, stir evenly, fill with nitrogen, add cross-linking agent, oxidant, reducing agent and FB auxiliary after 30 minutes, fill with nitrogen for a few minutes, stop filling with nitrogen, half The solution gradually thickened after 4 hours, and after 4 hours, the solution was in the form of a lump, and the reaction was completed. The rubber block is granulated by a granulator, dried, crushed and screened 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-absorbent resin. Background technique: [0003] In the existing related background technology, the production of superabsorbent materials by the aqueous solution method mainly includes the following categories: [0004] 1) Homopolymerization cross-linking system of pure acrylic acid, such as: EP349241, EP347241, US4921904; [0005] 2) The graft copolymerization cross-linking system of acrylic acid plus starch or cellulose, such as: CN1258686A, CN1258686A; [0006] 3) Acrylic acid and acrylamide copolymerization cross-linking 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 with a certain amount of bentonite, aqueous solution radiation method, CN85102156. [0009] The ...

Claims

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Application Information

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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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