In the field of synthetic rubber and polymer materials, oxidative aging remains a persistent challenge, causing performance degradation, appearance deterioration, and shortened service life. Traditional antioxidants face bottlenecks in efficiency, poor dispersibility, and environmental limitations. As a new-generation high-molecular-weight liquid antioxidant, Antioxidant 1520 (4,6-bis(octylthiomethyl)o-cresol) redefines the value standard of antioxidants with its core advantages of "high-efficiency protection" and "green transformation," becoming the ideal partner for materials such as polybutadiene rubber (BR), styrene-butadiene rubber (SBR), ethylene-propylene-diene monomer (EPDM), nitrile butadiene rubber (NBR), and thermoplastic elastomers (TPE).
I. Molecular Design Innovation: Full-Scene Adaptability of Liquid Antioxidant
As a high-molecular-weight liquid hindered phenolic antioxidant, the molecular structure of 1520 integrates phenolic hydroxyl active groups and octylthio methyl side chains:
Liquid Property: Transparent oily liquid at room temperature, with a viscosity of only 80-120 mPa·s (25°C). It can be rapidly mixed with rubber matrix at low temperatures (50-80°C) without solvents, improving dispersion efficiency by 40% and significantly reducing energy consumption and processing time.
Dual Antioxidant Mechanism: Phenolic hydroxyl groups capture alkyl free radicals (RO·, R·) to interrupt the oxidative chain reaction; thioether groups decompose hydroperoxides (ROOH) to form stable thioesters, achieving synergistic protection of "free radical capture + hydroperoxide decomposition". The antioxidant efficiency is 30% higher than that of traditional single-function antioxidants.
High Molecular Weight Advantage: With a molecular weight of 382.6 g/mol and a volatility of only 0.05% (150°C/24h), it retains over 95% of its activity during high-temperature processing (above 180°C), avoiding migration loss and precipitation risks of low-molecular-weight antioxidants.
II. Exclusive Solutions for Rubber Industry: Full-Cycle Performance Protection
1. Processing Stage: Stabilizing Manufacturing and Improving Yield
Gel Inhibition Expert: Adding 0.1%-0.3% of Antioxidant 1520 during the polymerization and post-treatment of polybutadiene rubber can inhibit the formation of gel particles, narrowing the Mooney viscosity fluctuation range from ±15% to ±5%. This solves problems such as screen blockage and surface defects caused by gels during mixing.
Empowerment for Hot-Melt Adhesives and Adhesives: In SBR-based hot-melt adhesives, liquid 1520 shows excellent compatibility with tackifying resins. After long-term storage at 120°C for 3 months, the peel strength retention rate reaches 98%, far exceeding 85% of traditional solid antioxidants.
2. Storage and Transportation: Resisting Environmental Erosion and Locking Original Performance
Color Stability Guardian: For styrene-butadiene rubber products stored in warehouses (25°C/60% RH) or transported under high-temperature and high-humidity marine environments, 1520 effectively inhibits the oxidative discoloration of styrene units. The yellowing index (YI) increases by <3 within 6 months, while the YI of untreated samples can increase by more than 15.
Molecular Weight Protector: In the storage of EPDM raw rubber, it prevents molecular weight degradation caused by oxidation, with the retention rate of weight-average molecular weight (Mw) exceeding 90% after 1 year, significantly better than 75% of traditional antioxidants.
3. Long-Term Use: Long-Acting Antioxidation and Prolonging Service Life
Dynamic Fatigue Resistance: In NBR seals, when used with 0.2% phosphite (such as TNPP), after hot air aging at 120°C for 1000 hours, the tensile strength retention rate reaches 82%, and the elongation at break retention rate is 75%, which is 15%-20% better than single-agent systems.
Weather Resistance Upgrade: Used in TPE toy materials, after 1000 hours of xenon lamp aging, the surface has no cracks and the color difference ΔE<2, meeting the strict migration requirements of the EN71-3 toy safety standard.
III. In-Depth Applications in Multiple Fields: Unlocking New Boundaries of Antioxidation
1. Automotive Industry: Full-Scene Performance Assurance
Tire Manufacturing: Adding 0.5% of Antioxidant 1520 to the tread compound of high-performance radial tires, combined with a nano-silica reinforcing system, can control the tread hardness change within ±3 Shore A after 300,000 km of driving, effectively delaying rubber aging and improving safety performance.
Interior Materials: Used in TPO materials for automotive dashboards, 1520 is compounded with ultraviolet absorbers. After aging tests at 80°C high temperature + 90% humidity for 2000 hours, it still maintains good surface gloss and scratch resistance, preventing interior fading and embrittlement.
2. Electronics and Electrical Appliances: Precision Protection Needs
Wire and Cable: In PVC insulation layers, Antioxidant 1520 significantly improves the thermal stability of materials. After aging at 150°C for 168 hours, the insulation resistance retention rate reaches 92%, while effectively inhibiting hydrogen chloride gas generated during processing, meeting the requirements of RoHS environmental protection directives.
Connector Sealant: Applied to EPDM-based sealants, 1520 ensures that the sealant maintains good elasticity and sealing performance within the wide temperature range of -40°C to 125°C, preventing sealing failure caused by oxidation and ensuring the reliability of electronic equipment.
3. Construction and Building Materials: Enhancement of Durability
Waterproof Materials: Adding 0.3% of Antioxidant 1520 to SBS modified asphalt waterproof rolls can enhance the weather resistance of the rolls. After 500 hours of artificial climate aging, the tensile strength retention rate exceeds 80%, effectively resisting the damage of environmental factors such as ultraviolet rays and ozone to materials.
Door and Window Seals: Used in EPDM seals, 1520 enables the seals to maintain good elasticity and compression set resistance after 5 years of outdoor exposure, ensuring the sealing and energy-saving effects of doors and windows.
4. Sports Goods: Enhancement of Athletic Performance
Sports Shoe Soles: In TPU sole materials, Antioxidant 1520 works synergistically with wear-resistant additives to improve the wear resistance of soles by 20%, while maintaining good flexibility and fatigue resistance under frequent bending, extending service life.
Fitness Equipment Grips: Used in TPE grip materials, 1520 prevents oxidative discoloration and surface hardening of materials caused by sweat, friction, and other factors during long-term use, maintaining a comfortable grip and aesthetic appearance.
IV. New Choice for Green Manufacturing: Dual Advancement from Compliance to Sustainability
1. Worry-Free Regulatory Compliance
Food Contact Safety: Certified by EU 10/2011 (migration limit 0.05 mg/kg), US FDA 21 CFR 178.2010 (permitted dosage ≤0.1%), and China GB 9685-2016, it can be used in rubber gaskets, seals, and other materials for food packaging.
Environmental Attributes: Non-amine structure, free of banned substances such as APEO and PFAS, with LC50 (fish) >1000 mg/L, complying with REACH-SVHC 233 control requirements, helping enterprises respond to global green trade barriers.
2. Support for Industrial Upgrading
Formulation Simplification and Efficiency Enhancement: It can achieve basic antioxidant effects without relying on phosphites, reducing formulation costs by 10%-15%; if used in combination, the synergistic effect can reduce the total addition amount by 20%, with significant cost-performance advantages.
Adaptability to Circular Economy: In the recycling and reprocessing of waste rubber, the thermal stability and low migration of 1520 make its retention rate in recycled rubber exceed 80%, effectively improving the secondary processing performance of recycled materials, in line with the sustainable development needs under the "double carbon" goal.
V. Experience the New Era of Antioxidation Now: From Sample Testing to Customized Services
Choosing Antioxidant 1520 means not only selecting a high-efficiency antioxidant but also a full-cycle performance protection solution covering "processing-storage-application":
Free Customized Testing: Provide compatibility testing and aging simulation experiments for your existing formulations, and issue detailed data reports within 7 working days.
Technical Collaborative Innovation: The joint R&D team can optimize formulations according to special needs (such as halogen-free flame retardancy, oil resistance enhancement), providing gradient solutions with addition amounts from 0.1% to 1%.
Supply Chain Guarantee: Standardized production base with an annual capacity of 5,000 tons. Liquid products support multiple specifications such as IBC ton barrels, 200L iron barrels, and 25kg plastic barrels, with nationwide delivery within 72 hours.
Antioxidant 1520: Let every material performance stand the test of time---From general-purpose to green, we redefine the value of antioxidation.
（Note: Data sources are from third-party testing institutions and internal corporate tests. The actual effects may vary slightly due to formulation differences.）
Post time: Jun-11-2025