EPDM rubber powder is made from waste EPDM rubber products through mechanical processing, crushing, or grinding. It retains the basic properties of EPDM rubber, with excellent resistance to high and low temperatures, ozone, and aging. It is highly compatible with rubber and plastics, and is widely used in construction, automotive, cable, and industrial rubber and plastic product production. While reducing production costs, it further improves the processing performance of the compound and the aging resistance of finished products.
1. Application of EPDM rubber powder in EPDM rubber products
(1) EPDM rubber powder improves the hardness and wear resistance of EPDM rubber products
When producing rubber products with lower hardness using EPDM rubber, EPDM rubber powder can be used as a reinforcing filler. During vulcanization, it forms physical entanglements and partial chemical crosslinking with EPDM rubber, enhancing interfacial adhesion, making the crosslinking network more uniform, and thereby improving the hardness and wear resistance of the finished product.
(2) EPDM rubber powder improves rubber processing performance
When producing solid rubber products with EPDM rubber, an appropriate amount of EPDM rubber powder can reduce the Mooney viscosity of the compound and improve the fluidity of processes such as mixing and extrusion. After extrusion, the shrinkage and expansion rates of the rubber compound containing rubber powder decrease, stabilizing the dimensions of the extruded semi-finished product and increasing the extrusion rate, which is especially important for continuously extruded products such as sealing strips and rubber hoses.
(3) EPDM rubber powder reduces the shrinkage rate and specific gravity of rubber products
In sponge foam rubber products mainly made from EPDM rubber, EPDM rubber powder is used as an inert filler and does not participate in the foaming reaction or shrink; As the amount of rubber powder increases, the foaming shrinkage rate of the composite system gradually decreases, and the dimensional stability of the product is significantly improved; The density of raw EPDM rubber is only 0.86-0.90 g/cm³, making it the lightest among commonly used rubbers. An appropriate amount of rubber powder can further reduce product density while maintaining performance, achieving lightweight design.
2. Application of EPDM rubber powder in natural rubber products
Natural rubber has high strength, good elasticity, and excellent flexural properties, but it has poor aging resistance, poor adaptability to high-temperature environments, and relatively low insulation performance. In rubber product formulations using natural rubber as the main raw material E6LYY331 adding an appropriate amount of EPDM rubber powder as a modified filler can effectively improve the environmental resistance of natural rubber products, making cracking, hardening, aging, and failure less likely to occur under outdoor exposure and low temperature conditions.
When filling natural rubber products with EPDM rubber powder, the amount of rubber powder is generally controlled at 10%-30% of the total amount of rubber, while the original adhesive and mechanical properties of the finished product remain unchanged. It is widely used in tire auxiliary rubber layers, outdoor rubber accessories, sealing products under high and low temperature conditions, and other fields.
3. Application of EPDM rubber powder in PP modification
Polypropylene (PP) has advantages such as chemical resistance, heat resistance, good electrical insulation, and high mechanical strength, but it has poor low-temperature impact strength, is prone to brittleness, and lacks sufficient weather resistance. EPDM rubber powder has good compatibility with PP and can be used for PP toughening and modification.
EPDM rubber powder is dispersed as an elastomer phase in the continuous phase of PP. When subjected to external impact, the rubber particles can induce silver lines and shear bands, absorbing impact energy and preventing crack propagation, thereby improving PP's impact strength. Research shows that when the mass fraction of EPDM rubber powder is about 15%, the impact strength of the PP/rubber powder blend system reaches its peak; The particle size of the rubber powder should be 80 mesh; particles that are too small or too large are not conducive to performance improvement.
EPDM rubber powder can be used as a functional filler modification material in rubber and plastic products. By properly filling EPDM rubber powder, EPDM rubber products can reduce their specific gravity and shrinkage, natural rubber products can significantly improve weather resistance and temperature tolerance, and PP materials achieve toughening and modification. When filling EPDM rubber powder into rubber and plastic products, strict control must be made to control the particle size, addition ratio, and blending process to further improve the application effectiveness of EPDM powder in the base material.
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