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A Characterization Method for Reversible Recovery Behavior of Compressive Stress Relaxation of Thermoplastic Vulcanizates

A thermoplastic vulcanizate and compressive stress technology, applied in the direction of applying stable tension/pressure to test material strength, strength characteristics, instruments, etc., can solve problems such as qualitative and quantitative characterization methods that have not yet been seen

Active Publication Date: 2019-03-12
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But so far, for the research on the reversible recovery behavior of thermoplastic vulcanizate compression stress relaxation, there is no generally accepted qualitative and quantitative characterization method

Method used

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  • A Characterization Method for Reversible Recovery Behavior of Compressive Stress Relaxation of Thermoplastic Vulcanizates
  • A Characterization Method for Reversible Recovery Behavior of Compressive Stress Relaxation of Thermoplastic Vulcanizates
  • A Characterization Method for Reversible Recovery Behavior of Compressive Stress Relaxation of Thermoplastic Vulcanizates

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1: Characterization of reversible recovery from compressive stress relaxation of EVA / NBR thermoplastic vulcanizates

[0018] Prepare cylindrical EVA (ethylene-vinyl acetate copolymer resin) / NBR (nitrile rubber) (mass ratio = 30 / 70) vulcanized rubber samples by molding method, and the samples should not have air bubbles, impurities and damage.

[0019] (1) Use GT-TCS-2000 electronic tensile machine to apply 50% strain on the cylindrical thermoplastic vulcanizate sample, and then test its stress relaxation behavior for the first time at room temperature. The test time is 10 minutes. height h 0 =9.86mm, when compressed to the specified compressive strain, the height is h s =4.93mm, record the stress-time relationship curve;

[0020] (2) After the first stress relaxation behavior test, the cylindrical sample was taken out from the universal testing machine, placed in a vacuum oven for heat treatment at 70°C for 30 minutes, and then taken out and cooled to room tem...

Embodiment 2

[0024] Example 2: Characterization of reversible recovery from compressive stress relaxation of PP / EPDM thermoplastic vulcanizates

[0025] Prepare cylindrical PP (polypropylene) / EPDM (ethylene propylene diene rubber) (mass ratio = 40 / 60) vulcanized rubber samples by molding method, and the samples should not have air bubbles, impurities and damage.

[0026] (1) Use GT-TCS-2000 electronic tensile machine to apply 50% strain on the cylindrical thermoplastic vulcanizate sample, and then test its stress relaxation behavior for the first time at room temperature. The test time is 10 minutes. height h 0 =9.99mm, when compressed to the specified compressive strain, the height is h s =4.995mm, record the stress-time relationship curve;

[0027] (2) After the first stress relaxation behavior test, the cylindrical sample was taken out from the universal testing machine, placed in a vacuum oven for heat treatment at 120°C for 30 minutes, and then taken out and cooled to room temperatu...

Embodiment 3

[0031] Example 3: Characterization of reversible recovery from compressive stress relaxation of PP / EPDM thermoplastic vulcanizates

[0032] Prepare cylindrical PP / DPDM (mass ratio = 40 / 60) vulcanized rubber samples by molding method, and the samples should not have air bubbles, impurities and damage.

[0033] (1) Use GT-TCS-2000 electronic tensile machine to apply 50% strain on the cylindrical thermoplastic vulcanizate sample, and then test its stress relaxation behavior for the first time at room temperature. The test time is 10 minutes. height h 0 =9.970mm, when compressed to the specified compressive strain, the height is h s =4.985mm, record the stress-time relationship curve;

[0034] (2) After the first stress relaxation behavior test, the cylindrical sample was taken out from the universal testing machine, placed in a vacuum oven for heat treatment at 140°C for 30 minutes, and then taken out and cooled to room temperature. At this time, the cylindrical sample height ...

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Abstract

The invention relates to a thermoplastic vulcanizate compression stress relaxation reversible recovery behavior characterization method, which provides an effective method for qualitative and quantitive characterization of reversible recovery. The characterization method comprises the steps of a, applying a compression strain on a sample, measuring a primary stress relaxation behavior, wherein the initial height of the sample is h0, and the height becomes hs when the sample is compressed to the stipulated strain; b, after finishing the primary test, carrying out heat treatment on the sample, and then cooling to the room temperature, wherein the height is h1, and the compression set is recorded as shown in the below figure; c, carrying out secondary compression stress relaxation test on the heat-treated sample, and by adopting the h1 as a baseline, applying the same strain of the primary test; d, reading the maximum stress in a stress relaxation curve, wherein the maximum stress recovery rate is equal to (the secondary stress relaxation maximum stress / the primary stress relaxation maximum stress) x 100 percent; e, qualitatively judging a reversible recovery degree according to a close degree of two-time stress relaxation behavior curves; and quantitatively judging the reversible recovery degree according to the compression set and the maximum stress recovery rate.

Description

technical field [0001] The present invention relates to a method for characterizing the reversible recovery behavior of thermoplastic vulcanizate compression stress relaxation, specifically, testing the compression stress relaxation behavior before and after heat treatment, and obtaining A method for the qualitative and quantitative characterization of the reversible recovery behavior of thermoplastic vulcanizates for compressive stress relaxation. Background technique [0002] Stress relaxation is the phenomenon that the stress inside the polymer material gradually decays with time at a constant temperature and deformation; the conformational rearrangement of the polymer chain and the slippage of the molecular chain lead to the stress relaxation of the polymer material. root cause. Stress relaxation reflects the molecular motion inside the polymer material; when the polymer material deforms at the beginning, the molecules in it are in an unbalanced conformation, and gradua...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/08
CPCG01N3/08G01N2203/0003G01N2203/0019G01N2203/0075G01N2203/0266G01N2203/0682
Inventor 王兆波高亮亮廖珂锐
Owner QINGDAO UNIV OF SCI & TECH
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