Classification of thermoplastic elastomers

- Apr 26, 2019-

Classification of thermoplastic elastomers:


 


1. TPV thermoplastic elastomer dynamic vulcanizate Thermoplastic Vulcanizate;


 


Dynamic full vulcanization: refers to the chemical cross-linking of the rubber phase under the action of the cross-linking agent when the thermoplastic resin is melt-blended with the rubber, and is sheared and broken into a large number of micro-sized crosslinked rubber particles by strong mechanical shearing action. , a process of dispersing in a continuous phase of a thermoplastic resin.


 


When PP is a hard segment and EPDM is a soft segment for melt blending, a cross-linking agent for vulcanization is added, and a fully vulcanized EPDM crosslinked rubber is obtained by mechanically high shearing force such as an internal mixer or a screw machine. The particles are well dispersed in the PP matrix in micron size (less than 1 micron).


 


Thermoplastic elastomer TPV features


 


★TPV has the heat resistance and low compression deformation properties of vulcanized rubber;


 


★Excellent processing performance: It can be processed by injection molding, extrusion and other thermoplastic processing methods. It is efficient, simple and easy to operate, no need to add equipment, high fluidity and small shrinkage.


 


        ★TPV does not require vulcanization and easy processing commonality


 


        ★ Light weight (0.90-0.97), uniform appearance quality, high surface quality and good hand feeling.


 


    ★TPV can be used normally from -60 °C to +135 °C; when it is not subjected to load, the high temperature resistance can reach +150 °C.


 


    ★ Wide range of hardness and hardness, 25A-70D;


 


    ★ The advantages of easy dyeing greatly improve the freedom of product design.


 


    ★Green, recyclable, and has no significant decline in performance after repeated use


 


    ★TPV has excellent ozone and weather resistance;


 


    ★TPV has anti-dynamic fatigue, excellent weather resistance and good wear resistance;


 


    ★Good elasticity and compression set resistance, environmental resistance and aging resistance equivalent to EPDM rubber;


 


    Thermoplastic elastomer TPV <wbr>TPE <wbr>TPR <wbr>TPU


 


    ★TPV has excellent corrosion resistance to water-based acid-base liquids and polar oils.


 


    ★TPV oil and solvent resistance is comparable to general-purpose neoprene.


 


    ★TPV has excellent acid and alkali resistance, and has strong resistance to acid-base detergents. It can maintain its original characteristics after long-term use in acid-base environment.


 


    2. TPO - Polyolefin Thermoplastic Elastomer Thermoplastic Polyolefin;


     A simple physical blend of PP and EPDM (partially vulcanized), referred to as TPO.


 


    In Japan, in addition to TPU, other thermoplastic elastomer materials are commonly referred to as TPO, which is said by the Japanese as TPO=TPE=TPV=TPR; however, the current TPO is basically improved to highly vulcanized rubber (similar to TPV), but added Some SEBS are modified, so you need to ask more when you meet Japanese customers.


 


    In 1984, Mitsubishi Chemical of Japan made a better performance mixture based on SEBS and SEPS, and named the saturated TPS as “Rubberron”. Therefore, SEBS and SEPS are not only general-purpose, but also melt-blended with PP plastic to form IPN-type TPS (so-called IPN, which is actually a polymer in which two networks are interpenetrated, so it is also called interpenetrating network compound; most of them It is a thermosetting resin, but there are also many thermoplastic elastomers such as TPE that are expressed in a cross-continuous phase. IPN-TPS formed by using SBS or SE8S as the substrate and other engineering plastics can be directly coated without pretreatment; the coating is not easily scratched and has certain oil resistance, and the elastic modulus is not in the wide temperature range of low temperature. What changes have greatly improved the cold resistance and heat resistance of engineering plastics. The styrene compound can also be a thermoplastic TPE by copolymerization with rubber. EPDM/styrene, BR/styrene, CI-IIR/styrene, NR/styrene and the like have been developed.


The above information is for reference only, please call the company if you need to know more, thank you!