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Method for qualitatively testing molecular weight distribution of ultrahigh molecular weight polyethylene (UHMWPE)

A technology of ultra-high molecular weight and molecular weight distribution, which is applied in the testing field of qualitative comparison and judgment of molecular weight distribution of ultra-high molecular weight polyethylene, can solve problems such as difficulty in obtaining molecular weight distribution curves accurately, small amount of molecular weight substances, and large test errors, etc., to achieve Good adaptability, low cost and good repeatability

Active Publication Date: 2012-02-15
SHANGHAI RES INST OF CHEM IND +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the amount of different molecular weight substances separated by this method is small and difficult to collect, and the experimental error is large, so it is difficult to accurately obtain the molecular weight distribution curve.

Method used

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  • Method for qualitatively testing molecular weight distribution of ultrahigh molecular weight polyethylene (UHMWPE)
  • Method for qualitatively testing molecular weight distribution of ultrahigh molecular weight polyethylene (UHMWPE)
  • Method for qualitatively testing molecular weight distribution of ultrahigh molecular weight polyethylene (UHMWPE)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Weigh a certain amount of GUR4022UHMWPE powder and antioxidant, add a certain amount of white oil solvent, and place this mixture in a three-necked flask. Install the stirring and heating device, and adjust the heating and stirring rate. A very dilute solution with a concentration of 0.02g / 100mL. Use NDJ-1 at different temperatures of 70℃, 80℃, 110℃, 120℃, 130℃, 135℃, 140℃, 150℃, 160℃ and 170℃. In the standard test of the type rotary viscometer, the viscosity is measured on the No. 1 rotor at 60 rpm. Each test temperature needs to be kept at a constant temperature for 15 minutes, and the viscosity readings are recorded at intervals of 3 viscosity values, and the average value is taken as the final result, and then the result is expressed as the standard sample A.

Embodiment 2

[0040] Weigh a certain amount of UHMWPE powder and antioxidant, add a certain amount of white oil solvent, and place this mixture in a three-necked flask. Install the stirring and heating device, and adjust the heating and stirring rate. Prepare a very dilute solution of sample B with a concentration of 0.02g / 100mL, at different temperatures of 70℃, 80℃, 110℃, 120℃, 130℃, 135℃, 140℃, 150℃, 160℃ and 170℃. The viscosity was measured using the NDJ-1 type rotary viscometer standard test on the No. 1 rotor at 60 rpm. Each test temperature needs to be kept at a constant temperature for 15 minutes, and the viscosity readings are recorded at intervals of 3 viscosity values, and the average value is taken as the final result, and then compared with Example 1 for evaluation.

Embodiment 3

[0042] Weigh a certain amount of UHMWPE powder and antioxidant, add a certain amount of white oil solvent, and place this mixture in a three-necked flask. Install the stirring and heating device, and adjust the heating and stirring rate. Prepare a very dilute solution of sample C with a concentration of 0.02g / 100mL, at different temperatures of 70℃, 80℃, 110℃, 120℃, 130℃, 135℃, 140℃, 150℃, 160℃ and 170℃. The viscosity was measured using the NDJ-1 type rotary viscometer standard test on the No. 1 rotor at 60 rpm. Each test temperature needs to be kept at a constant temperature for 15 minutes, and the viscosity readings are recorded at intervals of 3 viscosity values, and the average value is taken as the final result, and then compared with Example 1 for evaluation.

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Abstract

The invention relates to a method for qualitatively testing the molecular weight distribution of ultrahigh molecular weight polyethylene (UHMWPE). In the method, a set of method for comparing and judging the molecular weight distribution of the UHMWPE by combining the limiting viscosity number with kinetic viscosity of a raw material and testing kinetic viscosity by using a rotary viscometer according to the relation between the solubility and molecular weight dependence of the UHMWPE is designed. Compared with the prior art, the method is convenient and easy to operate, and is suitable for qualitatively judging the molecular weight distribution of a contrast sample.

Description

Technical field [0001] The invention relates to a testing method for the physical properties of ultra-high molecular weight polyethylene, in particular to a testing method for qualitatively comparing and judging the molecular weight distribution of ultra-high molecular weight polyethylene. Background technique [0002] Ultra-high molecular weight polyethylene (UHMWPE) refers to a linear structure polyethylene with a viscosity average molecular weight above 1.5 million. Because of its long molecular chain and extremely high molecular weight, it has some excellent qualities that other resins do not have, such as impact resistance, abrasion resistance, self-lubrication, chemical resistance, and low temperature resistance. At present, UHMWPE's main products include: fibers, plates, pipes, bars and finished products (including gears, bearings, bushings, rollers, guide rails, sliders, pads and various products, etc.), which are widely used in textiles, papermaking, food , Chemical, pa...

Claims

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Application Information

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IPC IPC(8): G01N11/04G01N11/14
Inventor 张玉梅王新威侯秀红吴向阳徐静安
Owner SHANGHAI RES INST OF CHEM IND
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