Page 76 - 《橡塑技术与装备》英文版2026年1月

HINA R&P TECHNOLOGY AND EQUIPMENT

modifiers improves the aging mechanical behavior of the 550 exhibited higher strength and elongation, significantly
blend. Meanwhile, to further investigate whether this type of surpassing the other three blends. This indicates that blends
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blend can be used for long-term service under more severe 4 and 5 are more resistant to high temperatures and have a
high-temperature environments, the EPDM/MVQ samples longer service life, making them suitable for use in harsh high-
were subjected to a thermo-oxidative aging test at 170℃ for 72 temperature working environments.
hours, as shown in Figure 6.
3 Conclusion
(1) Using ACM, EVM, NBR, and KH-550 as modifiers
for MVQ with high surface tension can significantly reduce its
water contact angle, narrow the difference in surface tension
with EPDM, and enhance the compatibility between the two.
Among them, the addition of NBR has the most pronounced
effect, resulting in the thickest interphase and the best
compatibility of the blended rubber.
(2) From the perspective of macroscopic mechanical
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properties, the performance of 5 blend rubber is not only
Figure 6 Tensile strength and elongation at break of the influenced by compatibility, but also by the interaction between
blended rubber after aging at 170 ℃
fillers and rubber, as well as the aggregation degree of fillers.

After undergoing a prolonged high-temperature exposure, Overall, its mechanical properties are the best, followed by 4 . #
the tensile strength and elongation at break of the blend (3) After thermal-oxidative aging treatment at 120℃
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samples have significantly decreased compared to those and 170℃ respectively, the EPDM/MVQ blends 4 and 5
subjected to thermo-oxidative aging at room temperature exhibited higher tensile strength and elongation at break,
and 120°C. Upon comparing five types of EPDM/MVQ indicating excellent aging resistance.
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blends, it was found that blends 4 with NBR and 5 with KH-

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