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Method for testing thermo-oxidative ageing degree of polyethylene material

A detection method, thermal oxygen aging technology, applied in the direction of nuclear magnetic resonance analysis, etc., can solve the problems of complex sample preparation process, large random factors of test results, large sample volume, etc., to achieve reliable information, convenient and fast detection process, The effect of evaluation accuracy on performance

Inactive Publication Date: 2012-07-04
ZHEJIANG UNIV
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  • Abstract
  • Description
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Problems solved by technology

The chance factor of the test results of this method is very large, and it requires a relatively complicated sample preparation process, and the required sample volume is large.
It can be seen that the above three methods are not universally applicable.

Method used

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  • Method for testing thermo-oxidative ageing degree of polyethylene material
  • Method for testing thermo-oxidative ageing degree of polyethylene material
  • Method for testing thermo-oxidative ageing degree of polyethylene material

Examples

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Embodiment Construction

[0032] Select 1g of high-density polyethylene (density 0.949g / cm3) pipe material, put it into a thermo-oxidative aging test box and perform thermo-oxidative aging at 100°C. Take out and test its free induction decay curve (FID curve) regularly, and select several typical results such as figure 2 shown, along with the longitudinal relaxation decay curve. The abscissa of the FID curve is polyethylene 1 H is the decay time variable, and the ordinate is the signal strength corresponding to different times during the decay process. The rapid decay at the initial stage corresponds to the decay process of the polyethylene crystalline phase, and the slow decay after 0.04ms corresponds to the decay process of the polyethylene amorphous phase, and the transition decay process between the crystalline phase and the amorphous phase corresponds to the decay of the polyethylene interface phase process. With the change of aging time, the attenuation of each phase changes, and the interfac...

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Abstract

The invention discloses a method for testing the thermo-oxidative ageing degree of a polyethylene material, which comprises: (1) testing the molecular motion performance and condensed-state structure distribution of the polyethylene material; (2) calculating an aging factor, crystal phase mass percent content, interface mass percent content and amorphous phase mass percent content according to the result of test of the step (1) ; and (3) determining the aging degree of the polyethylene material according to the result of the calculation of the step (2). Compared with the traditional test method, the method of the invention has the advantages of convenience, quickness, high accuracy, small sample number, no damages to materials in use and wide application range.

Description

technical field [0001] The invention belongs to the field of performance detection of polymer materials, in particular to a detection method for thermal oxygen aging degree of polyethylene materials. Background technique [0002] Polyethylene is one of the general-purpose plastic products with the largest output and consumption in the world today. It is odorless, non-toxic, has excellent low temperature resistance (the lowest operating temperature can reach -70 ~ -100 ° C), good chemical stability, can withstand the erosion of most acids and alkalis, is insoluble in common solvents at room temperature, and has low water absorption. , excellent electrical insulation performance, very wide range of uses, mainly used to manufacture films, containers, pipes, monofilaments, wires and cables, daily necessities, etc., and can be used as high-frequency insulation materials for TVs, radars, etc. However, polyethylene is very sensitive to the environment, especially poor heat aging r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N24/08
Inventor 阳永荣施小妹王靖岱蒋斌波范丽娜历伟杜丽君
Owner ZHEJIANG UNIV
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