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

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

Active Publication Date: 2012-07-11
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
  • Method for determining intermolecular association degree of contribution in hydrophobically-associating type polyacrylamide solution
  • 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), the macromolecular chains aggregate through hydrophobic associations to form a supramolecular structure (dynamic physical cross-linked network) dominated by intermolecular associations. , the hydrodynamic volume increases, and the solution viscosity increases significantly (Alain Hill, Francoise Candau, Joseph Selb, Properties of Hydrophobically Associat...

Claims

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Application Information

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Patent Type & Authority Applications(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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