Preparation of Foaming Masterbatches Based on Low-Temperature Machinable SEBS and Micro-foaming Thermoplastic Elastomers
The foaming masterbatches were prepared from the azodicarbonamide(AC)foaming agent,the blowing promotor,the surfactant and the hydrogenated styrene-butadiene block copolymer(SEBS)which can be processed at low temperature.The foaming masterbatches,dynamic vulcanized ethylene propylene diene monomer rubber(EPDM),polypropylene(PP)thermoplastic elastomer(TPE)were melt blended and extruded to prepare micro-foaming TPE materials via the twin-screw extruder.The effects of the contents of SEBS and foaming masterbatches on the density,mechanical properties and cell morphology of micro-foaming TPE samples were studied.The results show that when the mass fraction of SEBS is less than6%and the mass fraction of foaming masterbatches is3%,the prepared micro-foaming TPE material has lower density,higher mechanical properties,and its cell regularity reaches the best.
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