During long-term storage and use of rubber and its products, due to the effects of heat, oxygen, ozone, metal ions with variable valence, mechanical stress, light, high-energy rays, as well as other chemical substances and mold erosion, it will gradually become sticky and change. Hard and brittle or cracked. This phenomenon in which the physical and mechanical properties decrease with time and the elasticity decreases is called aging. With the progress and development of the aging process, the properties of rubber and its products will gradually decrease and completely lose their use value. To this end, it is necessary to add certain chemical substances to rubber and its products to improve its resistance to the above-mentioned destructive effects, thereby prolonging the storage period and service life of rubber and its products. Such substances are called antioxidants.

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