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Technical Paper

Gas-Free Phenolic Resin for Friction Materials

Phenolic resins have been widely used as a binder for friction materials such as disk pads and brake linings. Requirements for disk pads are flexibility, heat resistance, low wear and so on. To solve the above requirements, we have developed various modified resins. At the same time, reduction of manufacturing cost is also required to maintain price competitiveness. The way to reduce manufacturing costs is to cut down the molding cycles and post-baking time, as well as use raw materials with a low price. To increase the molding temperature is one of the effective methods for reducing molding cycle, because the reactivity of phenolic resin increases. However, it is much more difficult to determine the gas release time because large amounts of gas evolve in a very short period of time. The phenol-hexamine curing system is limited in its ability to reduce the molding cycle. In this study we developed a gas-free resin system.
Technical Paper

Modified Phenolic Resins for High Performance Friction Applications

Phenolic resins have been widely used as binders for Friction Materials. Increased performance requirements have driven the improvement of phenolic resins. Phenolic resins modified with silicone gel, NBR, and aromatic compounds were presented at the 18th ANNUAL BRAKE COLLOQUIUM & EXHIBITION in 2000, their performance levels and capabilities were described. As market demands increase, enhanced phenolic resins as binders are needed to provide high performance friction products with superior heat resistance and noise properties. This presentation will review the following resins: PR-ANP-50LB (a high resistant resin) its heat resistance has been greatly improved compared with the resin presented last year. PR-54365 (acrylic rubber modified resin) providing excellent flexibility and vibration absorption. PR-EPN (gas free resin) is able to reduce frequency of gas venting during molding frictions, thus shortening the molding time.