The use of butyl regenerated rubber instead of butyl rubber can maintain the excellent airtightness of butyl inner tubes and is therefore widely used to reduce the cost of butyl tube products. However, the inner tube products produced by using butyl reclaimed rubber are not perfect, and they lack the anti-aging properties. Generally, after the aging of the butyl regenerated rubber inner tube, the hardness will decrease and become soft and sticky, which will affect the The tightness and longevity of base tires; perhaps some people will say that adding more antioxidants is not enough? In fact, for the problem of softening the butyl inner tube and leaking the inner tube, it is better to add a small amount of EPDM reclaimed rubber than using an anti-aging agent. Xiao Bian shares with you a butyl regenerated rubber inner tube compounded with EPDM reclaimed rubber:
Butyl regenerated rubber, 90 parts; EPDM reclaimed rubber, 10 parts; Accelerator M, 0.3 parts; Accelerator TMTD, 0.9 parts; Accelerator ZDC, 0.6 parts; Stearic acid, 0.4 parts; Zinc oxide, 2 Parts; sulfur, 1 part; total 105.2 parts.
When using this formula to produce butyl inner tubes, the curing time is controlled at 15 minutes and the curing temperature is 170°C. (PS: The reason why the formula does not add antioxidants and paraffins is that both butyl and ethylene-propylene rubbers are aging-resistant polymers)
EPDM reclaimed rubber is the best anti-aging property of reclaimed rubber products, and general EPDM reclaimed rubber products will become hard and brittle after aging, and aging with butyl inner tube is just two At the extremes, the two can be combined in a small amount, which can precisely restrain each other, improve the aging of the butyl inner tube, and reduce the airtightness, thereby delaying the aging time of the butyl regenerated rubber inner tube products and prolonging the service life.
However, in actual production, the use of EPDM reclaimed rubber in butyl regenerated rubber inner tube formulations can improve the performance of butyl inner tube products, but due to the restrictions on the compatibility of butyl regenerated rubber and EPDM reclaimed rubber. , Can only use a small amount of EPDM reclaimed rubber, so be sure to pay special attention to the amount of EPDM reclaimed rubber.
In fact, currently in the rubber product industry, many rubber product manufacturers use rubber to improve the performance of the product, or add some rubber (raw or reclaimed rubber) as a modifier to another rubber as the main raw material. In the product formulation, the processing performance and performance of the rubber product are improved; or the reclaimed rubber is used together with the same type of raw rubber to reduce the raw material cost. With regard to the use of various rubber compounds, we will discuss with you one by one later.
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