Explanation

It refers to the process of getting micron sized rubber phase evenly dispersed in resin by means of crosslinking (vulcanization) agent and strong mechanical shear stress during polymer blending of rubber and thermoplastic resin. thermoplastic elastomers can be manufactured by dynamic vulcanization. polymer blending thermoplastic elastomers has experienced three stages in polymer blending technology: the first stage is simple mechanical polymer blending (non vulcanization); The second stage is partial dynamic vulcanization, such as partial dynamic vulcanization of ethylene-propylene-diene-terpolymer rubber (EPDM) and polypropylene (PP); phase H is full dynamic vulcanization, such as fully vulcanization EPDM and PP. After partial dynamic vulcanization in the second stage, the strength, compression set, heat resistance, solvent resistance and other properties of the obtained thermoplastic elastomers are significantly improved than those in the first stage due to the existence of a small amount of crosslinking structure in the phase of rubber; The third stage is also called thermoplastic vulcanization rubber. Its phase state is completely crosslinking ethylene-propylene-diene-terpolymer rubber particles dispersed in polypropylene matrix, so the strength, elasticity, heat resistance, compression set resistance and other properties of TPV have been greatly improved compared with the previous two stages.

Classification