Nitrile reclaimed rubber is widely used in the production of various oil-resistant and wear-resistant rubber products, effectively reducing raw material costs. When producing rubber products primarily using nitrile reclaimed rubber, designing a reasonable anti-aging system can stop the free radicals generated from rubber macromolecules under the action of oxygen, heat, and light from reacting with rubber molecule chains. It can also reduce the oxygen absorption rate during rubber aging by thousands of times, effectively delaying the aging of rubber products.
1. Performance Requirements of Anti-Aging Agents for Nitrile Reclaimed Rubber Products
Anti-aging agents can be classified by chemical structure into amines, phenols, heterocycles, and reactive anti-aging agents. Designing an anti-aging system for nitrile reclaimed rubber products requires that the agents have the following performance characteristics: ① High protective effect; ② Not easy to migrate to the rubber surface or no blooming after migration; ③ Minimal or no impact on vulcanization; ④ Easy to disperse in the rubber compound; ⑤ No or minimal effect on the color of the rubber compound; ⑥ Non-toxic.
2. Key Points for Using Anti-Aging Agents in Nitrile Reclaimed Rubber Products
When producing rubber products with nitrile reclaimed rubber, it is necessary to choose the appropriate anti-aging agent depending on the product’s anti-aging requirements, using either a single agent or a combination. The dosage is typically controlled at 1.5-2 parts by weight per 100 parts of rubber. Without causing blooming or affecting the physical and mechanical properties of the product, the amount can be expanded by 3-5 parts to improve the anti-aging effect. Generally, pollution-type anti-aging agents offer better protection than non-pollution types.
3. Common Tips for Anti-Aging Agent Combinations in Different Types of Nitrile Reclaimed Rubber Products
In practice, oil-resistant nitrile reclaimed rubber products are recommended to use anti-aging agents that are less likely to be extracted, or the amount of anti-aging agent can be appropriately expanded. Different types of anti-aging agents have different solubilities in nitrile reclaimed rubber, and dosage limits vary.
(1) Anti-Aging System for Heat-Oxidation Resistant Nitrile Reclaimed Rubber Products
Anti-aging agents 4010, 4010NA, H, AW, NBC, and D provide excellent ozone aging protection, and adding paraffin or microcrystalline wax can synergize against sunlight and ozone aging, typically at 1-2 parts.
Some nitrile reclaimed rubber products can also be blended with nitrile rubber, PVC, chlorinated polyethylene (CPE), or epichlorohydrin rubber (ECO) to improve ozone resistance.
(2) Anti-Aging System for Flex-Resistant Nitrile Reclaimed Rubber Products:Anti-aging agents such as 4010, H, D, 4010NA, H+D, and H+A can be used, typically at 1-2 parts by weight, up to 3-5 parts.
(3) Anti-Aging System for Non-Pollution Nitrile Reclaimed Rubber Products:Agents such as SP, MB, 2246, and 264 can be used, typically at 1-2 parts by weight.
(4) Anti-Aging System for Heat-Resistant Nitrile Reclaimed Rubber Products:Agents like RD and BLE can be used, or 4010 and MB can be combined.
(5) Anti-Aging System for Fatigue-Aging Resistant Nitrile Reclaimed Rubber Products:Agents such as H and 4010 can be used.
(6) Anti-Aging System for Light-Aging Resistant Nitrile Reclaimed Rubber Products:Agents like WSP can be used. Carbon black provides excellent protection against sunlight and UV rays.
Using nitrile reclaimed rubber in production, improper choice of anti-aging agents can easily lead to a decline in the physical and mechanical properties, reducing the value of the finished product. When choosing anti-aging agents for reclaimed rubber products, both the protective effect and cost-performance ratio should be considered. In the future, I will continue to share common types and dosages of anti-aging agents used in making oil-resistant rubber sheets, hoses, shoes, sealing strips, wear-resistant parts, and other rubber products with nitrile reclaimed rubber.
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