The Application of Rubber Antioxidant (TMQ/RD) in Brake Pads Production
In the intricate realm of brake pads manufacturing, the quest for materials that can enhance performance, durability, and safety is unceasing. Rubber Antioxidant (TMQ/RD) has emerged as a significant component in this domain, with its unique properties influencing the quality of brake pads. This article delves into the application of Rubber Antioxidant (TMQ/RD) in brake pads production, highlighting its advantages and disadvantages.
1. Rubber Antioxidant (TMQ/RD) Basics
TMQ (2,2,4-Trimethyl-1,2-dihydroquinoline polymer) and RD (2,2,4-Trimethyl-1,2-dihydroquinoline) are commonly used rubber antioxidants. TMQ is usually a brown – colored resin with a softening point in the range of 75 – 100°C. RD, on the other hand, appears as a yellow – brown powder. These antioxidants are renowned for their ability to impede the oxidation process of rubber compounds. Oxidation can cause rubber to degrade, losing its elasticity and mechanical strength. In the context of brake pads, they safeguard the rubber components in the brake pads mixture from oxidative damage, thus maintaining the overall integrity of the brake pads.
2. Incorporation into Brake Pads Mixture
In a brake pads mixture, Rubber Antioxidant (TMQ/RD) is blended with a variety of other substances. Binders, such as phenolic resins, form the structural backbone, holding all the components together. Fillers like mica, kaolin, or graphite are added to fine – tune the mechanical and thermal characteristics of the mixture. Rubber components, which are vital for providing flexibility and contributing to friction modulation, are also an essential part of the mix. In a typical brake pads mix, the quantity of Rubber Antioxidant (TMQ/RD) generally ranges from 1 – 3% by weight. This proportion is meticulously determined, as even a slight deviation can have a substantial impact on the performance of the final brake pads.
3. Role in brake pads friction materials
As an integral part of brake pads friction materials, Rubber Antioxidant (TMQ/RD) plays a crucial role in extending the lifespan of the rubber components within the friction materials. During the braking process, brake pads are subjected to high temperatures, mechanical stress, and exposure to oxygen. Rubber Antioxidant (TMQ/RD) helps to counteract the negative effects of these factors on the rubber. For example, in brake pads without an antioxidant, the rubber components may start to show signs of cracking and hardening after being exposed to temperatures above 150°C for a certain period. However, with the addition of TMQ or RD, the rubber can maintain its flexibility and mechanical properties up to temperatures of around 200 – 220°C. This enhanced heat – resistance and oxidation – resistance of the rubber components in the friction materials contribute to more consistent braking performance over time.
Advantages of Using Rubber Antioxidant (TMQ/RD) in Brake Pads Production
- Extended Service Life: Brake pads with Rubber Antioxidant (TMQ/RD) have a significantly extended service life. A field study on passenger car brake pads revealed that the addition of TMQ/RD increased the average lifespan of the brake pads by 20 – 30% compared to those without the antioxidant. This means fewer replacements for vehicle owners, reducing both maintenance costs and downtime.
- Improved Thermal Stability: Rubber Antioxidant (TMQ/RD) enhances the thermal stability of the brake pads friction materials. Under high – temperature braking conditions, the friction coefficient of brake pads with TMQ/RD can be maintained more steadily. Laboratory tests showed that in a simulated high – speed braking scenario where the brake pad temperature reached 300°C, the friction coefficient of brake pads with TMQ/RD fluctuated by only ±0.05, while that of non – antioxidant – treated brake pads fluctuated by ±0.15. This stability ensures reliable braking performance even in extreme conditions.
- Enhanced Durability: By preventing the oxidation of rubber components, TMQ/RD improves the overall durability of the brake pads. The rubber in the brake pads remains more elastic and resistant to wear and tear. In a durability test involving repeated braking cycles, brake pads with Rubber Antioxidant (TMQ/RD) showed 15 – 20% less wear compared to those without it, indicating a longer – lasting product.
Disadvantages of Using Rubber Antioxidant (TMQ/RD) in Brake Pads Production
- Cost Increase: The addition of Rubber Antioxidant (TMQ/RD) to brake pads production can lead to a cost increase. The cost of TMQ and RD, along with the need for more precise manufacturing processes to ensure proper dispersion in the mixture, can raise the overall production cost by 10 – 15%. This cost increase may be passed on to the consumers, making the brake pads less price – competitive in some markets.
- Possible Impact on Initial Friction Performance: In some cases, the use of Rubber Antioxidant (TMQ/RD) may have a minor impact on the initial friction performance of the brake pads. During the first few braking cycles, the friction coefficient of brake pads with TMQ/RD may be slightly lower than that of non – antioxidant – treated brake pads. Although this difference is usually small, typically around 0.02 – 0.03 in the friction coefficient, it could potentially be a concern in applications where immediate and consistent braking performance is crucial.
- Environmental Considerations: Some rubber antioxidants, including TMQ and RD, may have environmental implications. When brake pads are worn out and disposed of, the antioxidants may leach into the environment. Although the exact environmental impact is still being studied, there are concerns about the potential accumulation of these substances in soil and water bodies, which could potentially affect ecosystems.