In the production of brake shoes, the use of Rubber Antioxidant (TMQ/RD) in brake shoes mixtures and mixes, especially in brake shoes friction materials, has become an important aspect to ensure the quality and performance of brake shoes. This antioxidant plays a crucial role in maintaining the integrity and functionality of the brake shoes over time.

TMQ/RD has outstanding oxidation – resistance properties. In brake shoes, which are often exposed to high – temperature and oxygen – rich environments during operation, this antioxidant can effectively slow down the oxidation process of the rubber components in the friction materials. For instance, in a high – temperature aging test at 150°C, the brake shoes friction materials without the antioxidant showed a significant degradation in mechanical properties after 100 hours. However, with the addition of 2 – 3 phr (parts per hundred rubber) of TMQ/RD, the degradation was greatly reduced. The tensile strength of the friction materials with the antioxidant only decreased by 10 – 15% after 500 hours of the same high – temperature aging test, while the non – antioxidant – added samples had a 50 – 60% reduction.

By preventing oxidation, TMQ/RD effectively prolongs the service life of brake shoes. Field tests have shown that brake shoes with the antioxidant can last 30 – 40% longer than those without it. This is because the antioxidant inhibits the formation of cracks and the hardening of the friction materials, which are common failure modes due to oxidation over time. For example, in a fleet of trucks with regular brake usage, the brake shoes with TMQ/RD – treated friction materials needed replacement after 100,000 – 120,000 kilometers of operation, while those without the antioxidant required replacement after 70,000 – 80,000 kilometers.

Although there is an additional cost for adding TMQ/RD to the brake shoes mixture, considering the extended service life and reduced maintenance costs, it is cost – beneficial in the long run. The cost of replacing brake shoes less frequently can save up to 25 – 35% in maintenance expenses for vehicle owners or operators.

The procurement cost of TMQ/RD is relatively high. Adding 2 – 3 phr of this antioxidant to the brake shoes mixture can increase the material cost by about 15 – 20%. This may pose a challenge for manufacturers who are highly cost – sensitive, especially in a price – competitive market.

In some cases, TMQ/RD may have compatibility issues with other components in the brake shoes mixture. For example, when combined with certain types of reinforcing fillers in the friction materials, it can cause a slight reduction in the bonding strength between the rubber matrix and the fillers. In a shear – strength test between the rubber matrix and the filler, the samples with TMQ/RD showed a 5 – 10% lower shear – strength value compared to samples without it, which may potentially affect the overall mechanical performance of the brake shoes.

In summary, Rubber Antioxidant (TMQ/RD) offers remarkable advantages in brake shoes production, such as excellent oxidation resistance, prolonged service life, and long – term cost – effectiveness. However, its high initial cost and potential compatibility issues need to be carefully considered and addressed by manufacturers to fully utilize its benefits in the production of high – quality brake shoes.