Processing waste rubber into rubber powder is one of the main ways of recycling waste rubber. When rubber powder is used in rubber products, the particle size of the rubber powder directly affects the comprehensive index of the product. The main production methods of rubber powder include normal temperature pulverization, low temperature pulverization and ultra-fine pulverization. There are certain differences in the particle size of rubber powder processed by different pulverization methods, and the impact on the physical properties of rubber products is also different. The editor shares with you the influence of the particle size of rubber powder processed by two common crushing processes on the physical properties of rubber products.
1. Freeze crushing
When rubber powder crushed by the freezing method is used in the production of rubber products, the smaller the particle size of the rubber powder, the closer the tensile strength, elongation at break, abrasion and other properties of the rubber material to the rubber material without the addition of rubber powder 2YLYY630. In actual production, after adding rubber powder crushed by the freezing method, the dynamic properties of the rubber compound such as fatigue resistance and crack growth resistance are improved to different degrees compared with the rubber without adding rubber powder. Theoretically, the rubber powder particle size The smaller the value, the greater the improvement.
2. Crushing at room temperature
The smaller the particle size of the rubber powder smashed by the normal temperature pulverization method, the closer the physical and mechanical properties of the rubber powder mixed with the rubber powder to the performance of the rubber powder without added rubber powder. The tensile strength and elongation at break vary with the size of the rubber powder. Increase and decrease, but the flex crack resistance performance is significantly improved, and the other indicators are similar to those of the compound without rubber powder. It can be seen that selecting a rubber powder with a suitable particle size in the production of rubber products can effectively reduce the cost of raw materials on the premise of meeting the requirements of the physical properties of rubber products.
3. Rubber powder application
Adding a certain amount of rubber powder with a suitable particle size to the rubber product can not only reduce the cost of raw materials, but also significantly improve the fatigue resistance of the rubber product, especially the performance of flex cracking and crack growth resistance, as well as the process performance of the rubber compound. In actual production, 5%-10% rubber powder (particle size 60-80 mesh) is often added to the formula during the processing of tire tread rubber and sidewall rubber to reduce tire production costs and increase tire mileage. .
Room temperature pulverization is more common in the production of rubber powder. The latest vulcanized rubber powder national standard defines room temperature pulverization as follows: the method of preparing vulcanized rubber powder by roller extrusion shearing and grinding disc grinding under normal temperature conditions; vulcanized rubber currently on the market The powder is mainly tire rubber powder. In actual production, the amount of rubber powder, surface properties, etc. will also affect its blending effect in rubber products. Later, the editor will discuss related issues with you.
Exclusive original article [commercial authorization] reprint, excerpt and excerpt in any form are prohibited without written authorization. Focus on Hongyun rubber: learn the process formula and raw material technology of producing rubber products from recycled rubber to help you reduce costs and increase profits