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Method for determining intermolecular association degree of contribution in hydrophobically-associating type polyacrylamide solution

A technology of polyacrylamide and contribution degree, which is applied in the field of polymer science and experiment to achieve the effect of simple solution preparation and good repeatability

Active Publication Date: 2014-03-19
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although various test methods such as stress sweep, dynamic oscillation test, and creep can be used to determine zero-shear viscosity, for hydrophobically associated polyacrylamide solutions, a typical "weak" structure fluid, accurate and repeatable The zero-shear viscosity test results still require extensive research work on rheological testing procedures

Method used

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  • Method for determining intermolecular association degree of contribution in hydrophobically-associating type polyacrylamide solution
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  • Method for determining intermolecular association degree of contribution in hydrophobically-associating type polyacrylamide solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Example 1, the relationship between cyclodextrin and hydrophobic group molar ratio and intermolecular hydrophobic association

[0042] 1) Associative polyacrylamide (prepared by 0.8 mol acrylamide, 0.2 mol sodium acrylate and 0.005 mol hexadecyl dimethyl allyl ammonium bromide at 50 ° C for 8 hours, the molecular weight is 4.0×10 6 g / mol) was dissolved in deionized water with stirring at 40° C. for 8 hours to obtain a polymer mother liquor with a concentration of 10000 mg / L;

[0043] 2) Dissolving β-cyclodextrin in deionized water with stirring at 30°C for 2 hours to obtain β-cyclodextrin mother liquor with a concentration of 10000 mg / L;

[0044] 3) Mix the polymer mother liquor obtained in step 1), the cyclodextrin mother liquor obtained in step 2) and deionized water with 20°C for 4 hours according to different ratios, and then obtain a series of [CD] / [H] different ( [CD] / [H]=0-10) the hydrophobic association type polyacrylamide solution to be tested;

[0045] 4) F...

Embodiment 2

[0068] Example 2, the repeatability of zero-shear viscosity test results of different concentrations of hydrophobic association polyacrylamide solutions

[0069] Adopt the zero-shear viscosity test determined by the present invention (implementation example 1 step 4)) and calculation method to carry out repeatability test to the zero-shear viscosity of embodiment 1 gained associative polyacrylamide, experimental result is as follows:

[0070] Table 1. Repeatability of zero-shear viscosity test results

[0071]

[0072] According to the experimental results in the table, the average error of the zero-shear viscosity parallel test results obtained by adopting the rheological test procedure determined by the present invention is less than 3%.

Embodiment 3

[0073] Example 3, Comparison of the degree of contribution of intermolecular associations in different concentration intervals

[0074] 1) Associative polyacrylamide (obtained from 0.8mol acrylamide, 0.2mol sodium acrylate and 0.005mol hexadecyldimethylallyl ammonium bromide by copolymerization at 50°C for 8 hours, molecular weight 4.0×10 6 g / mol) was dissolved in deionized water with stirring at 50° C. for 6 hours to obtain a polymer mother liquor with a concentration of 10000 mg / L;

[0075] 2) Dissolving β-cyclodextrin in deionized water with stirring at 35°C for 1 hour to obtain β-cyclodextrin mother liquor with a concentration of 10000 mg / L;

[0076] 3) Stir and mix the polymer mother liquor, cyclodextrin mother liquor and deionized water obtained in steps 1) and 2) at 25°C for 3 hours to obtain the associative polyacrylamide solution to be tested; the associative polyacrylamide Solution 300-2000mg / L, [CD] / [H]=0 and 4.

[0077] 4) For the hydrophobic association polyacr...

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Abstract

The invention discloses a method for determining the intermolecular association degree of contribution in a hydrophobically-associating type polyacrylamide solution. According to the method, the contribution degree of an intermolecular associating action on a supramolecular solution structure is quantitatively calculated by comparing zero shear viscosities of the hydrophobically-associating type polyacrylamide solution before and after the intermolecular associating action is damaged. According to the method, a zero shear viscosity test result with repeatability can be obtained and the parallel test error of the zero shear viscosity test result is less than 3 percent; and the quantitative evaluation for the intermolecular associating action is realized for the first time, thereby the discussion on basic theoretic problems such as intramolecular / intermolecular associating balance, the structure viscosity and the non-structural viscosity is transferred from qualitativeness to quantitativeness, a quantified research method for further studying the relationship between the structure and the performance of a polymer molecular is provided and the important application value is realized.

Description

technical field [0001] The invention belongs to the field of macromolecule science and experiment technology, and relates to a method for measuring the contribution degree of intermolecular association in a hydrophobically associated polyacrylamide solution. Background technique [0002] Hydrophobically Associating Water-Soluble Polymers (HAWSP for short) refers to a water-soluble polymer with a small amount of hydrophobic groups on the hydrophilic macromolecular chain of the polymer. In aqueous solution, when the polymer concentration is higher than a certain critical concentration (Critical Association Concentration, CAC), macromolecular chains aggregate through hydrophobic associations to form a supramolecular structure dominated by intermolecular associations (dynamic physical crosslinking). network), the hydrodynamic volume increases, and the solution viscosity increases significantly (Alain Hill, Francoise Candau, Joseph Selb, Properties of Hydrophobically Associating ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N11/00C08F220/56C08F220/06C08F226/02
Inventor 冯茹森郭拥军李华兵周薇薛新生
Owner CHINA NAT OFFSHORE OIL CORP
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