The antioxidant family is vast, with its members each performing their own specific functions according to different materials and application needs.
· Plastics and Synthetic Resins: In general-purpose plastics and engineering plastics such as polypropylene (PP), polyethylene (PE), polystyrene (PS), and ABS resin, antioxidants can prevent thermal-oxidative aging during processing (high-temperature shearing) and use, maintaining their mechanical properties, color, and transparency. For example, television casings, car bumpers, food packaging films, etc., all rely on the protection of antioxidants.
· Rubber industry: Rubber products such as tires, seals, and conveyor belts are subjected to dual attacks from dynamic fatigue and oxygen during use. Antioxidants (often referred to as antiagers in rubber) can effectively prevent rubber from cracking, becoming sticky, hardening, and other phenomena, greatly extending its service life.
· Lubricating oil and fuel: Engine oil, hydraulic oil, transformer oil, etc., are prone to oxidation under the catalysis of high temperatures and metal ions. This oxidation leads to an increase in oil viscosity, the formation of oil sludge and acidic substances, and corrosion of equipment. The addition of antioxidants can significantly enhance the oxidation stability of the oil, ensuring long-term stable operation of mechanical equipment.
· Food and Feed: To prevent the spoilage and deterioration of nutrients such as oils and fats, vitamins, etc. due to oxidation, the food industry employs safe and non-toxic antioxidants like natural vitamin E, ascorbic acid (vitamin C), and tertiary butylhydroquinone (TBHQ) to ensure the flavor and safety of food.
· Adhesives and Coatings: Antioxidants can prevent adhesives and coatings from experiencing issues such as film brittleness, coating powdering, loss of gloss, and discoloration due to oxidation, thereby maintaining their decorative and protective functions. Development Trends and Future Outlook With the continuous improvement of global awareness of environmental protection, health, and safety, the antioxidant industry is also developing towards efficiency, safety, and environmental friendliness: 1. Efficiency and Multifunctionality: Developing "high molecular weight antioxidants" with high molecular weight, migration resistance, and extraction resistance to provide long-lasting protection. At the same time, research and development of additives that combine multiple functions such as antioxidant and light stabilization to simplify the formulation system. 2. Environmental Friendliness and Biodegradability: Increasing research on non-toxic, harmless, biodegradable natural-source antioxidants (such as rosemary extract, tea polyphenols, etc.) to meet the strict requirements of food contact materials and biodegradable plastics. 3. Composite Synergistic Technology: Through in-depth research on the synergistic mechanisms between different antioxidants and between antioxidants and other additives (such as light stabilizers, heat stabilizers), low-cost composite formulations are designed. Antioxidants, this seemingly small chemical auxiliary agent, are actually indispensable "guardians of youth" for modern industrial materials. They work silently in the molecular world of materials, resisting the erosion of oxygen and safeguarding the performance and safety of products ranging from daily necessities to high-end industrial products.
