Thermoplastic vulcanizate compression stress relaxation reversible recovery behavior characterization method
A thermoplastic vulcanizate, 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
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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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