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Method for determining anion type polyacrylamide hydrolysis degree

A polyacrylamide, anionic technology, used in material analysis by observing the effect of chemical indicators, and analysis by chemical reaction of materials, etc., to achieve the effect of improving accuracy and precision and eliminating errors

Inactive Publication Date: 2009-01-07
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using this principle of action to measure the degree of hydrolysis of anionic polyacrylamide has not been reported in the literature at home and abroad.

Method used

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  • Method for determining anion type polyacrylamide hydrolysis degree
  • Method for determining anion type polyacrylamide hydrolysis degree

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Firstly, four known anionic polyacrylamide samples with a hydrolysis degree of 10-30% and a cationic polymer acrylamide / acryloyloxyethyltrimethylammonium chloride copolymer with a cationic degree of 30% were prepared to concentration The mother liquor is 2000mg / L. After being fully dissolved, compound the cationic polymer with the concentration of 2000mg / L and HPAM series concentrations (100mg / L~2000mg / L) of different degrees of hydrolysis respectively in equal volumes (100ml each); Shake well with the upside-down method, and let it stand for 15 hours to make it fully react to form a gel precipitate, and then filter the precipitate with a 300-mesh standard metal screen to obtain the sample solution to be tested; -1 Under shear rate and 34 ± 0.1 ℃ of constant temperature conditions, measure the apparent viscosity of the dilute liquid phase after treatment; According to the HPAM concentration (C L ) and the corresponding HPAM degree of hydrolysis (HD), establish a standar...

Embodiment 2

[0018] The polyacrylamide sample 2 to be tested with unknown degree of hydrolysis is prepared into a mother liquor with a concentration of 5000mg / L, and after being fully dissolved, the propylene with different concentrations (100mg / L-2000mg / L) is determined in the same way as in Example 1. Amide / dimethyl diallyl ammonium chloride copolymer (30% cationicity) is compounded in equal volume (100ml), and after the sample is further processed, the apparent viscosity of the dilute liquid phase is measured to obtain the HPAM corresponding to the lowest point of viscosity Concentration (C L ) is 500mg / L, utilize the standard working curve that the method of embodiment 1 establishes to obtain the degree of hydrolysis 25.1% of polyacrylamide sample to be tested, and measure by GB 12005.6-89 method, the result is as attached table 1.

Embodiment 3

[0020] Prepare the polyacrylamide sample 3 with unknown degree of hydrolysis into a mother liquor with a concentration of 5000 mg / L, and after fully dissolving, use the same method as in Example 1 to fix the concentration of propylene Amide / methacryloyloxyethyltrimethylammonium chloride copolymer (30% cationicity) is compounded in equal volume (100ml), and after the sample is further processed, the apparent viscosity of the dilute liquid phase is measured to obtain the lowest point of viscosity Corresponding HPAM concentration (C L ) is 950mg / L, utilize the standard working curve that the method of embodiment 1 establishes to obtain the degree of hydrolysis 15.4% of polyacrylamide sample to be tested, and measure by GB12005.6-89 method, the result is as attached table 1.

[0021] Schedule 1 Example

[0022]

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PUM

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Abstract

The invention relates to a method of determining the degree of hydrolysis of anionic polyacrylamide. At first, a cationic polymer of 2V / s is weighed to prepare the solution of volume V and of concentration of 2000mg / L; anionic polyacrylamide of cV / s is weighed with a known degree of hydrolysis of 5 percent to 35 percent to prepare the solution of volume V and of concentration of 100mg / L to 2000mg / L; the solution of serial concentrations and the prepared cationic polymer solution are compounded with the same volume of 100ml to produce gel precipitation; the cationic polymer has acrylamide unit in the molecular chain; the cationic degree is 30 percent; the apparent viscosity of the sparse liquid phase is determined; a standard working curve is built; the standard working curve of the detected polyacrylamide sample with unknown degree of hydrolysis can be acquired according to the steps; thus the degree of hydrolysis of the detected polyacrylamide sample can be acquired. The method can eliminate the error of determination, and improve the accuracy and precision.

Description

Technical field: [0001] The invention relates to a method for measuring the degree of hydrolysis of anionic polyacrylamide. Background technique: [0002] The degree of hydrolysis is an important detection index for evaluating the quality of dry powder partially hydrolyzed polyacrylamide products. GB 12005.6-89 provides a method for determining the degree of hydrolysis by hydrochloric acid titration using methyl orange-indigo as a mixed indicator. This method is relatively simple. It is widely used, but this method has disadvantages such as a small amount of hydrochloric acid standard solution, no obvious discoloration of the indicator end point, etc., and the error caused by human factors cannot be eliminated. Patent 02144718.7 provides a method for determining the degree of hydrolysis by conductometric titration, which is an improvement based on the method of GB 12005.6-89, and uses an instrument to detect the change in the conductivity of the solution during the titration...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/82
Inventor 娄清香陈权生陈素萍赵文强杨晓红
Owner PETROCHINA CO LTD
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