Butyl rubber has low unsaturation, excellent air tightness, heat resistance, ozone resistance, aging resistance and chemical resistance; The butyl reclaimed rubber has the basic performance characteristics of butyl rubber, which can replace the butyl raw rubber to produce rubber products and reduce the cost. When using butyl reclaimed rubber alone or butyl rubber/butyl reclaimed rubber in combination to produce rubber products, the demand for antioxidant is generally small, but for rubber products with special requirements for heat resistance and ozone resistance, it is important to properly use antioxidant.
1. Design points of anti-aging system for producing heat-resistant rubber products with butyl reclaimed rubber
When using butyl reclaimed rubber and butyl rubber/reclaimed rubber compound to produce rubber products, zinc oxide can not only be used as curing activator, but also have good thermal and oxygen aging properties in butyl rubber compound; When the content of zinc oxide is more than 15 phr, the heat resistance of butyl reclaimed rubber vulcanizate can be significantly improved. Magnesium oxide also has certain anti-aging properties in butyl reclaimed rubber and butyl rubber/reclaimed rubber blends. When butyl rubber is used to produce white and colored rubber products, the addition of magnesium oxide can significantly improve the weather resistance and color stability of rubber compounds.
In actual production, the amount of zinc oxide and magnesium oxide can be controlled among 15-30 phr to improve the heat and oxygen aging properties of butyl reclaimed rubber.
2. Design points of anti-aging system for producing ozone resistant rubber products with butyl reclaimed rubber
Although the butyl rubber itself has good ozone resistance, when using butyl reclaimed rubber, butyl rubber/butyl reclaimed rubber and rubber to produce high filled products used under high ozone concentration conditions, it is still necessary to improve the ozone resistance of the rubber through anti-aging system design. To improve the ozone aging resistance of butyl reclaimed rubber and butyl rubber/reclaimed rubber, the commonly used antiagers include antioxidant 4010, antioxidant NBC, etc.
In actual production, 2-3 parts of non-polluting deodorant, 1-1.5 parts of polluting deodorant and about 5 parts of paraffin are used. The butyl reclaimed rubber and butyl rubber/reclaimed rubber 2SLYY27 products have excellent ozone resistance. Using 0.5-2 parts of antioxidant 4010, butyl vulcanizate has good steam aging resistance; 0.5-1.5 parts of antioxidant NBC, butyl vulcanizate has better dynamic properties. It should be noted that ester plasticizers will reduce the low temperature fluidity and ozone resistance of rubber. When using butyl rubber to produce rubber products with high ozone resistance requirements, it is necessary to carefully select plasticizers.
To design the anti-aging system of butyl reclaimed rubber products, it is necessary to select the appropriate type of anti-aging agent in combination with the specific use situation of rubber products, and fully consider the impact of other compounding systems on the aging performance of butyl rubber. Later, the editor will continue to discuss relevant issues with you.
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