Speaking of nitrile rubber reclamation, we will think of its oil resistance, it is undeniable, nitrile reclaimed rubber oil performance is the best in the plastic products; and talked about the noise reduction and sound absorption, the general will use butyl rubber reclaimed , Because butyl rubber regeneration shock absorption performance is good; as mentioned EPDM rubber, we think of a variety of outdoor rubber products are the same, it is a matter of course. However, if I say that nitrile reclaimed rubber has good sound absorption performance, do you believe? Did you ever associate nitrile rubber with sound absorption?
Nitrile rubber reclaimed for the production of oil-resistant rubber products, we can accept the production of wear-resistant rubber products such as wear-resistant damping block, is also reasonable, but the production of sound-absorbing materials, it is hard to believe. But in fact, as an organic polymer material, nitrile reclaimed rubber has good viscoelasticity and internal damping performance. Its viscoelasticity is enough to convert mechanical vibration and acoustic vibration energy in heat energy, so as to achieve shock absorption The purpose of noise; on the other hand, the damping of nitrile reclaimed rubber is very close to that of water, so underwater acoustic performance is stronger, underwater engine noise reduction is a typical application. Compared with acrylonitrile-butadiene rubber, butyronitrile rubber has better fluidity, more plasticity, easy foaming, calendering and extrusion. It is an ideal sound-absorbing material.
Nitrile rubber reclaimed with excellent sound absorption properties, then you know NBR rubber production of sound-absorbing materials when the sound absorption performance and what is relevant, what should pay attention to?
1, NBR regenerative rubber sound absorption performance better than other types of reclaimed rubber, such as silicone rubber reclaimed rubber, EPDM reclaimed rubber, natural rubber reclaimed rubber, etc .; This is determined by its special molecular structure: nitrile The larger the cyano group in the molecular structure of the reclaimed rubber as a test base group, this structure seriously hinders the acoustic wave to change the vibration behavior of the rubber molecules; therefore, when a certain acoustic energy is injected in the interior of the acoustic absorbent member , More work needs to be done to change the vibration of the rubber molecules, resulting in more energy consumption.
2, Under normal circumstances, the sound absorption performance of nitrile rubber regeneration after vulcanization will decline; This is because the hardness of nitrile rubber reclaimed after vulcanization will increase, prompting the speed of sound waves in the rubber to speed up and reduce the reclaimed rubber Sound absorption performance.
3, the use of nitrile rubber reclaimed rubber production, thickness, shape of the product have an impact on the sound absorption; which reclaimed nitrile rubber thickness of the acoustic absorption of different frequencies of different sound absorption: In theory, the regeneration of nitrile The thicker the glued product, the greater the distance the sound wave propagates in the sizing material, the better the sound absorbing effect is. However, when the sonic frequency is increased to 2500HZ, the sound absorbing performance of the reclaimed rubber product will decrease as its thickness increases .
4, to nitrile rubber reclaimed rubber raw materials for the production of sound-absorbing materials, add the appropriate amount of foaming agent, vermiculite can improve the sound performance of nitrile reclaimed rubber, in which the defoamer added 1.5%, vermiculite powder 30% Sound best.
Do you have any new suggestions for the production of sound-absorbing materials for nitrile reclaimed rubber?
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