Thermoplastic vulcanizate (TPV) is a high-performance thermoplastic elastomer material, by combining the rubber phase with the thermoplastic, and making the rubber phase vulcanized in the melt blending process, forming a composite material with rubber elasticity and plastic processability, generally EPDM rubber combined with PP. EPDM rubber powder is a powdered rubber processed from waste EPDM rubber products, which can be blended with PP materials to prepare TPV thermoplastic vulcanized rubber particles to reduce costs.
When blending EPDM with polypropylene to prepare thermoplastic elastomers with good physical properties and processability, the following points need to be noted.
1. Modification of rubber powder: The use of modifiers such as rosin, phenolic resin, etc. to improve EPDM/PP rubber powder is an important means to improve the performance of EPDM/PP blend materials.
2. Determine the blending ratio: The blending ratio of EPDM powder and PP has a significant impact on the performance of TPV TPV TPV particles, and determining the optimal ratio of the two usually needs to consider the final application of the material, the required physical properties, processing performance and cost-effectiveness.
First of all, adjust the ratio of EPDM powder and PP according to the needs of the product to obtain the ideal hardness, tensile strength, aging resistance and chemical resistance. Generally, increasing the proportion of EPDM rubber powder can improve the elasticity and flexibility of the product, and increasing the proportion of PP can improve the rigidity and processing performance of the product.
Secondly, considering the processing properties such as the fluidity and melt strength of the material, the increase in the proportion of PP can usually improve the processing fluidity of the material, and at the same time, some elastomer properties may be sacrificed.
The market price of EPDM rubber powder and PP material should be selected with the highest blending ratio under the premise of meeting the performance requirements of TPV thermoplastic vulcanizate particles.
In addition, the blending temperature, shear force and blending time will also affect the final properties of TPV thermoplastic vulcanizate particles prepared by blending EPDM rubber powder and PP. In general, determining the optimal blending ratio is often verified by laboratory tests and small-scale production trials.
In actual production, the appropriate use of EVA can improve the compatibility among EPDM rubber powder and PP, and EVA has good low temperature resistance. When the blending ratio of PP, EVA and rubber powder is 40/15/45, TPV. The comprehensive properties of thermoplastic vulcanizate rubber particles are better.
The TPV thermoplastic vulcanized rubber particles prepared by EPDM rubber powder/pp blend have the elasticity and flexibility of rubber, the processing type of plastic, as well as good heat resistance, weather resistance, chemical corrosion resistance, etc., and are widely used in automobiles, home appliances, construction and other fields, especially in the automotive industry.
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