Vulcanized rubber powder takes waste rubber as raw material, and is mechanically crushed or ground into powder substances with different particle sizes. According to the production process, it can be divided into rubber powder with normal temperature grinding method, rubber powder with low temperature grinding method, rubber powder with wet grinding method, rubber powder with ozone grinding method, etc. The shape, particle size, surface morphology and properties of rubber powder processed by different manufacturing methods are different.
1. Particle size and common use of rubber powder produced by different production methods
The shape and particle size of rubber powder are different due to different production methods. Generally, the particle size of rubber powder produced by normal temperature method is 0.3-1.4mm; The particle size of rubber powder produced by low temperature method is 0.075-0.3mm; The particle size of rubber powder produced by wet method or solution method is above 0.075mm.
Coarse rubber powder (1.0-6.0mm) can be mixed with polyurethane for paving and manufacturing floor tiles, sound insulation and heat insulation materials in sports fields, tennis courts, gym floors and school playgrounds; Coarse rubber powder (0.5-1.0mm) can be used as raw material of reclaimed rubber 2ELYY1021 and modified mixture of paving asphalt. Fine rubber powder (0.3-0.5mm) can be directly mixed with raw rubber, and the dosage can be 10% - 20%. The fine rubber powder (<0.3mm) can be used in the manufacture of solid tires and shock absorption rubber products with 100% mixing amount. The superfine rubber powder (>0.075mm) can be used in the tire with 30% of the mix content without affecting the mechanical properties.
2. Shape and surface state of rubber powder produced by different production methods
When the vulcanizate powder is crushed at normal temperature, it is mainly due to the shear force, while the low-temperature crushing is mainly due to the impact force. The particle shape of crushed rubber powder at room temperature is irregular, and the particle surface has numerous bumps and burrs, which is conducive to the combination with other materials; The rubber powder particles crushed at low temperature have regular shape, smooth surface and acute angle. For the same number of rubber powder, the surface area of rubber powder produced by wet method or solution method is larger than that produced by normal temperature method or low temperature method.
3. Matching properties of rubber powder and raw rubber produced by different production methods
Compared with the rubber powder crushed at normal temperature, the rubber powder crushed at low temperature has less thermal oxidative aging and oxidation phenomena. However, the performance of vulcanizates from rubber powder with the same particle size and raw rubber is almost the same, which is not affected by the crushing method. As the accumulated heat of crushed rubber powder at room temperature is small, the waste rubber contains antioxidant, and the oxidation of rubber powder surface is less. The normal temperature crushed rubber powder is favorable for surface treatment and activation due to its surface characteristics. The activity of wet method or solution method is higher than that of normal temperature method and low temperature method.
Processing waste rubber into vulcanized rubber powder is one of the main ways to deal with waste rubber. Developing the application of vulcanized rubber powder in rubber industry and non rubber industry can handle more waste rubber. Later, Xiaobian will continue to share with you the specific application of various vulcanized rubber powder.
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