After the rubber sealing product is compressed, the cross section and the contact surface will be tightly combined to prevent penetration and leakage to achieve the sealing effect. The compression deformation of the rubber material directly affects the sealing effect and service life of the rubber sealing product; now many rubber sealing products manufacturers will reduce the production cost. Using reclaimed rubber, carbon black is the most commonly used reinforcing agent; in actual production, semi-reinforcing carbon black affects the compression-resistant permanent deformation of reclaimed rubber, and the amount of semi-reinforcing carbon black should be reasonably controlled 1JLYY86.
1. Advantages of semi-reinforcing carbon black
Semi-reinforcing carbon black is a kind of soft carbon black with a particle size of 61-100nm. It has good reinforcing effect when used as a filler in the production of reclaimed rubber sealing products, which can give the compound high elongation and high. Elastic, reclaimed rubber seals using semi-reinforcing carbon black have less heat generation and excellent aging resistance during use; semi-reinforcing carbon black is used compared to rubber with high wear-resistant carbon black and channel black Recycled rubber compounds have low compression set and are often used in the production of reclaimed rubber seals, especially dynamic seals.
2. Effect of semi-reinforcing carbon black on reclaimed rubber sealing products
The semi-reinforcing carbon black has the functions of reinforcing and filling in the reclaimed rubber sealing product, and reduces the compression permanent deformation rate of the rubber to a certain extent. However, in actual production, the larger the amount of semi-reinforcing carbon black, the more carbon black particles are physically adsorbed and bonded on the rubber macromolecular chain; when the stress is relaxed after the external force is removed, the rubber chain's moving ability is weakened. The rebound resilience deteriorates; when the amount of semi-reinforcing carbon black exceeds a certain value, the compression set of the reclaimed rubber sealing product will increase significantly, so it is necessary to properly control the amount of semi-reinforcing carbon black in the reclaimed rubber sealing product.
3. Reasonable control of semi-reinforcing carbon black dosage
There are many types of reclaimed rubber products. Different types of reclaimed rubber seals have different amounts of semi-reinforcing carbon black. For example, rubber-sealing products produced by EPDM/recycled rubber are used as examples. Generally, the amount of semi-reinforcing carbon black is more than 25 parts. At the time of compression, the compression set of the sealed article rises remarkably. EPDM rubber is a low-density, high-fill rubber. Therefore, the filling amount of semi-reinforcing carbon black in EPDM rubber/recycled rubber is larger than that in other types of rubber and reclaimed rubber sealing products; other types are used. When reclaimed rubber is used to produce sealed products, the amount of semi-reinforcing carbon black should be appropriately reduced.
When using recycled rubber to produce rubber sealing products, carbon black is an indispensable reinforcing filler. In order to reduce the compression permanent deformation of reclaimed rubber sealing products and prolong the service life of sealing products, it can be used in an appropriate amount while properly controlling the amount of semi-reinforcing carbon black. General purpose carbon black, fast extrusion carbon black or spray carbon black to improve the comprehensive performance of reclaimed rubber sealing products.