Reasons for rubber aging
1. Thermal oxidative aging: When rubber materials come into contact with oxygen in the air, oxidation reactions will occur under high-temperature conditions, causing rubber products to harden, crack, and become brittle.
2. Photooxidative aging: Radiation such as ultraviolet rays will destroy the rubber molecular chain and react with oxygen in the air to form free radicals, causing aging and damage to rubber materials.
3. Chemical action: Rubber materials are easily corroded by chemicals such as acid and alkali substances, ozone, chlorine, and heavy metals in the air, leading to aging.
4. Mechanical action: Mechanical actions such as stretching, compression, bending, and torsion that rubber products are subjected to during use will accelerate the aging process of rubber materials.
5. Storage conditions: Rubber products will also age and deteriorate under poor storage conditions, such as high temperature, high humidity, and direct sunlight.
The aging of rubber is often accompanied by some significant phenomena. In terms of appearance, rubber products may deform, become brittle, harden, crack, mold, lose gloss, and change color. In terms of physical properties, rubber materials may change in swelling, rheological properties, etc. In terms of mechanical properties, the tensile strength, elongation at break, impact strength, bending strength, compression rate, elasticity, and other indicators of rubber products will decrease.
Measures to prevent rubber aging
1. Chemical protection method
The chemical protection method mainly inhibits or delays the aging reaction by adding antioxidants to rubber materials. Commonly used antioxidants include amines and phenols. These antioxidants can effectively resist aging factors such as oxygen and ultraviolet rays, thereby extending the service life of rubber products. When selecting antioxidants, it is necessary to reasonably select and possibly use multiple antioxidants in combination according to the specific use conditions and requirements of rubber products to achieve better anti-aging effects.
2. Physical protection method
The physical protection method is to add a protective film on the surface of rubber products to prevent the rubber from direct contact with aging factors. For example, coating the rubber surface, adding paraffin, using light shielding agents, or blending rubber and plastics. These measures can significantly reduce the impact of the external environment on rubber, thereby extending its service life.
3. Control processing temperature
Rubber is prone to aging due to high temperatures during processing, so the processing temperature must be strictly controlled. By optimizing the production process and reducing the exposure time in a high-temperature environment, the aging rate of rubber can be effectively reduced.
4. Storage conditions
The storage environment of rubber products also has a significant impact on their aging rate. Rubber products should be stored in a low temperature, low humidity, ventilated, and dry environment, avoiding direct sunlight and moisture. This can effectively slow down the aging process of rubber and extend its service life.
Methods to remove safety hazards
1. Regular inspection and replacement
Rubber products in use, such as automotive seals, pipe seals, etc., should be inspected regularly. Once aging, cracking, and severe wear and tear are found, they should be replaced in time. Especially for key components such as tires, their aging and deterioration will directly affect driving safety, and must be replaced strictly according to the prescribed replacement cycle.
2. Select high-quality materials
When purchasing rubber products, products with reliable quality and good anti-aging performance should be selected. Different types of rubber materials have different anti-aging properties, and appropriate materials should be selected according to specific use conditions and requirements.
3. Strengthen safety education and publicity
Through strengthening safety education and publicity, improve the public's awareness of rubber aging and deterioration and its safety hazards. Let people understand the causes of rubber aging, anti-aging measures, and replacement cycles so that they pay more attention to the maintenance and replacement of rubber products in daily life.
Conclusion
Rubber aging is a complex process involving multiple factors. By understanding the causes and manifestations of rubber aging, we can better prevent and control the occurrence of rubber aging, thereby extending the service life of rubber products and reducing safety risks.
