Natural rubber has high mechanical strength, good flexural fatigue resistance, small hysteresis loss, low heat generation during multiple deformation; it also has good cold resistance, water resistance, electrical insulation, etc., and is widely used in various types of rubber products. However, because there are unsaturated double bonds in natural rubber, light, heat, ozone, radiation, flexural deformation and copper, manganese and other metals can promote the aging of natural rubber, so the aging resistance is poor; it is necessary to improve the aging resistance of natural rubber and prolong the service life through reasonable design of antiaging system.
In actual production, according to the actual use of natural rubber products and the use of conditions, reasonable selection of antioxidants, reasonable design of antioxidant system, which is an effective way to improve the aging performance of natural rubber and extend the service life of products.
Rubber antioxidants can be divided into antioxidant, anti-ozone, anti-fatigue, anti-harmful metal, anti-ultraviolet and other varieties according to the protective effect.
When producing rubber products with natural rubber as the main raw material, the commonly used rubber antioxidants are antioxidant RD, antioxidant A, antioxidant DNP, antioxidant 4020, antioxidant 4010NA, antioxidant AW, antioxidant MB, antioxidant SP, antioxidant SP-C, antioxidant 3100, etc. An antioxidant can be used alone or two or more antioxidants can be used.
When using natural rubber to produce rubber products with high requirements for heat and oxygen aging, more use of antioxidant RD, antioxidant A, the amount of 1-2 copies. Natural rubber products require ozone resistance, it is recommended to use a larger amount of antioxidant 4020, antioxidant 4010NA, the amount of control between 0.5-1 copies. The use of natural rubber production of light-colored products must choose non-polluting antioxidant, common varieties of antioxidant MB, antioxidant SP, antioxidant SP-C, antioxidant 264, antioxidant 2246, etc..