What happens if zinc oxide is not used or is added in excess in rubber?

2020-04-19

It is well known that zinc oxide offers many excellent properties for rubber, improving modulus, tensile strength, and abrasion resistance. However, some may ask, what are the consequences of not adding zinc oxide to rubber or adding excessive amounts? Let's follow the zinc oxide manufacturer to find out.

It is known that zinc oxide has many beneficial effects on rubber, improving modulus, tensile strength, and abrasion resistance. However, some people ask, what are the consequences of not adding zinc oxide or adding excessive amounts to rubber? Let's follow zinc oxide manufacturer to find out.

What happens if zinc oxide is not used or is added in excess in rubber?


When we do not add zinc oxide, the overall quality of the rubber will decrease. Simply put, if we think in reverse about the function of zinc oxide, we know that zinc oxide is mainly used as a vulcanization activator in rubber production. If we do not add a sufficient amount of zinc oxide, its effect will be weaker.
When we add excessive zinc oxide to rubber products, the rubber zinc oxide and stearic acid will increase the vulcanization speed with a certain reinforcing effect, but it is also prone to blooming. Generally, in a sulfur vulcanization system, the dosage is usually 2-5 parts. Some rubber shoes also use peroxide vulcanization, with a dosage of about 2-3 parts. Zinc stearate is an effective substitute for zinc oxide, especially in peroxide-vulcanized rubber. Therefore, excessive amounts of zinc oxide and stearic acid in rubber will produce this effect.
 

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