Modified Friction Linings Improve Braking Properties

Drivers of commercial vehicles and cars will not only be able to brake more quickly in future, braking is also set to get quieter.

The new modifier increases both the flexibility of friction and brake linings and resistance to oils and automotive fuels, while also improving wear properties. A particular advantage lies in the reduction of braking noise.

Developed by Bayer Chemicals AG, Leverkusen, the new modifier, Baymod® N VP KA 8641 is a plasticizing polymer developed on the basis of Baymod® N XL 38.20, a product which has already set a new benchmark in powdered nitrile rubbers.

Thanks to the use of calcium carbonate as the mould release agent - replacing the talc used in Baymod® N XL 38.20 - the new modifier offers improved free flowing properties, making it an easier material to work with.

With an ACN content of 38 percent, this pre-crosslinked nitrile rubber is highly polar and can be mixed with phenol resins of the same polarity in practically any mixing ratio. Just small quantities are all that are needed to achieve a major improvement in the phenol resins' property profile.

Baymod® N VP KA 8641 increases the abrasion coefficients so that activating the brake has an immediate effect even at low temperatures. There is no delay while the brake linings heat up.

Baymod® N VP KA 8641 is used to bind fibers, fillers and phenol formaldehyde resins.

Production of these types of resin mixtures usually involves mixing the solid components in a high-speed mixer. The very small particle size of the new modifier enables the rubber to be optimally dispersed even without the use of solvent.

Fibers and fillers are very easily incorporated into the resin matrix. To produce the brake linings, the mixture is then pressed onto a metal support and fabricated into the finished component.

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