In the production of rubber products, reclaimed rubber can be used as the main raw material or auxiliary rubber to reduce the production cost of rubber products. It can also be used as a filler in the production of natural rubber products. It can be used together with carbon black, white carbon black and other reinforcing agents to improve natural rubber. Reinforcement performance; then why reclaimed rubber can improve the natural rubber reinforcement, and how is it achieved?
Recycled rubber is a process of sorting, crushing, desulfurizing, filtering and molding of waste rubber products. Its composition is related to the raw materials used. Take tire reclaimed rubber as an example: the main components of tire reclaimed rubber are rubber hydrocarbons. Carbon black and a small amount of undesulfurized tire rubber powder, these components will agglomerate in the rubber product to form a defective pore structure during the use of the reclaimed rubber, so that the activation energy of the rubber compound from the hot vulcanization period to the vulcanization flat period is greatly improved. The reaction rate gradually decreases; as the vulcanization temperature increases, the vulcanization rate in the high reaction stage gradually increases.
Carbon black is one of the most commonly used reinforcing fillers in the production of rubber products, which can significantly improve the properties of rubber compounds. However, due to the small particle size and high structure of carbon black, agglomeration will occur when too much is filled, and it is stacked in natural rubber. The carbon black in the matrix will form a defect structure; the reclaimed rubber is fully mechanized and smelted in the production process, and has excellent fluidity, dispersibility and plasticity. When used as an elastic filler in natural rubber products, it is used in reclaimed rubber. The small molecular substance can act as a plasticizer to alleviate the agglomeration of the carbon black particles, thereby improving the interfacial compatibility between the carbon black particles and the natural rubber matrix, and improving the reinforcing performance of the natural rubber.
The white carbon black natural rubber product can meet the demand of white or translucent rubber products, and improve the adhesion, tear strength and heat aging resistance of the rubber product. However, silica has a large specific surface area and high surface activity, and has a large difference in surface properties from the natural rubber matrix. The compatibility is poor. The surface modification of silica is carried out by adding a silane coupling agent, and it participates in natural rubber during the vulcanization process. The rubber compound reacts to improve the dispersibility of white carbon black in natural rubber, increase the chemical force between white carbon black and natural rubber, and improve the reinforcing performance.
When the tire reclaimed rubber is added as a filler to the natural rubber to improve its reinforcing performance, the tire reclaimed rubber produced by using different fineness rubber powders at different temperatures has different effects on the reinforcing performance of the natural rubber, and the rubber product manufacturer needs to Actual demand selection: The higher the regeneration temperature of the general reclaimed rubber, the greater the tensile strength and elongation at break of the natural rubber product, and the more obvious the reinforcing effect.