epdm rubber v belt friction coefficietn

Friction performance is an important technical indicator of rubber products. Products such as rubber shoes, conveyor belts, and brake valve linings require a higher coefficient of friction, while dynamic seals require a lower coefficient of friction. For automotive tires, friction characteristics not only affect the wear characteristics of tires, but also affect driving safety. The friction coefficient of a rubber belt affects the working efficiency of the pulley. Too much or too little friction coefficient is not good. Too much friction makes power transmission difficult, and the friction is too small. It is easy to slip between the belt and pulley. So how to measure epdm rubber v belt friction coefficient?

The friction of soft rubber on hard and smooth surfaces is mainly adhesive friction. When the liquid completely lubricates the contact surface, the adhesion force between the interfaces can be ignored. At this time, the friction force generated is mainly due to the hysteresis loss caused by deformation and the viscous resistance of the lubricating liquid. The thickness of the lubricating film changes with sliding. When the part of the lubricating film is cut off, direct contact adhesion friction will also occur, which significantly increases the friction force.

Due to the complexity of the above rubber friction phenomenon, there are no mature standards for measuring the sliding friction coefficient of vulcanized rubber published in standards such as ISO, ASTM, BS, JIS, and DIN. The national chemical industry standard HG/T2729-1995 Determination of the friction coefficient between vulcanized rubber and sheet (sliding method) specifies two methods for determining the static and dynamic friction coefficients between vulcanized rubber and sheet. Method A is applicable to the determination of the surface friction coefficient of vulcanized rubber samples. Method B is applicable to the determination of the friction coefficient of vulcanized rubber samples used for conveying wheels such as photocopiers and fax machines during repeated friction.

The friction coefficient of epdm rubber belts cannot be defined because there are various factors that affect the friction coefficient, such as the surface condition of the contact surface and the roughness of the sheet in contact with the rubber, the sliding rate, the adhesive friction of the rubber, the vertical pressure on the contact surface of the rubber and the rigid surface, and the ambient temperature. Therefore, there is currently no method to provide specific values for epdm rubber v belt friction coefficient.