Adhesion strength test of vulcanized rubber and steel cord

The bonding performance between steel cord and rubber directly determines the service life of the tire. The bonding performance is usually marked and evaluated by adhesive force and adhesive grade. The adhesion force is the force required to pull the cord out of the rubber compound; the adhesion grade refers to the degree of adhesion on the cord surface after the cord is pulled out of the rubber compound.
The bonding mechanism between steel cord and rubber is generally considered to be that the copper in the brass coating and the sulfur in the rubber compound combine with each other to form copper sulfide at the interface. That is, during vulcanization, the sulfur in the rubber compound not only acts as a cross-linking reaction, but also acts as an adhesion reaction, and tries to make the two reactions reach a balanced state.
Therefore, the vulcanization system in the rubber compound has a very significant impact on the bonding properties of steel cord and rubber. The bonding strength test between vulcanized rubber and steel cords can measure the bonding strength between vulcanized rubber and the steel cords embedded in it.
Zhongke Testing Reliability Experiment Center has the ability to test the reliability performance of various vulcanized rubbers, and provides professional bonding strength testing services for vulcanized rubber and steel cords.

1. The bonding strength is determined by measuring the force value of pulling out a single steel cord in the axial direction from the rubber sample in which it is embedded. When testing, the fixture used should have round or square test holes to ensure uniform stress.
2. The sample preparation is made by vulcanizing rubber and steel cords embedded in rubber under specified pressure. In Method 1, the outer surfaces of the rubber sides of the specimen need to be appropriately reinforced. In method 2, this reinforcement is not needed.

GB/T 16586-2014 Determination of bonding strength between vulcanized rubber and steel cord
ISO 5603-2011 Determination of bonding strength of vulcanized rubber to steel cord
GB/T 2941 Rubber physical test methods General procedures for specimen preparation and adjustment
GB/T 6038 Rubber test compound batching, mixing and vulcanization equipment and operating procedures
GB/T 17200-2008 Technical specifications for rubber and plastic tensile, compression and bending testing machines (constant speed drive)
GB/T 25269-2010 Rubber Test Equipment Calibration Guide