What is the difference between TPE material and TPR material?
With the increasing popularity of thermoplastic elastomers, people will increasingly come into contact with such materials as thermoplastic elastomers. Because this type of material contains a variety of different varieties and properties of elastomer materials. Among these thermoplastic elastomer materials, users are generally exposed to the two concepts of TPE and TPR. Both TPE and TPR belong to SBC styrene thermoplastic elastomer polymer blend modified alloy elastomer materials, so many users are concerned about TPE and TPR. The difference between TPR is rather vague, I don't know how to distinguish it. In order to solve this question, I will introduce the difference between the two in detail:
1. Appearance and feel
TPE matte surface absorbs light, low brightness, and smooth touch. TPR shiny surface is reflective, high brightness, rubber elasticity to the touch, and not as smooth as TPE.
In the elastomer industry, the thermoplastic elastomer modified on the basis of SEBS is generally called TPE, and the thermoplastic elastomer modified on the basis of SBS is called TPR. TPR has better elasticity than TPE. TPE has a saturated molecular structure, and its aging resistance, yellowing resistance, temperature resistance and corrosion resistance are better than TPR.
3, processing temperature
Usually TPR can be processed thermoplastically at about 150°C, while TPE needs to be processed thermoplastically at about 180°C. Of course, it also depends on their molecular weight. If the molecular weight is high, the processing temperature is also higher.
4. Burning and smell
TPE burns to produce lighter smoke with an aromatic smell. The smoke produced by TPR combustion is thicker and darker (because SEBS is hydrotreated by SBS, it has high hydrogen content, burns without heavy smoke, and has a small taste.)
5. Chemical properties
SEBS is a hydrogenated product of SBS, and its chemical stability, aging resistance, UV resistance, hydrolysis resistance and temperature resistance are better than SBS. Therefore, TPE synthesized with SEBS as the base material is more chemical than TPR synthesized with SBS as the base material. Stability, aging resistance and UV resistance are also better. It needs to be pointed out that some places may be called habitual reasons. The styrene elastomer modified materials TPE and TPR are both called TPR, while ignoring the difference between the SEBS and SBS base materials.
6, SEBS performance and application
SEBS is the use of hydrogenation to saturate aliphatic double bonds in order to expand the scope of product application. Saturated thermoplastic elastomer SEBS has better weather resistance and heat aging resistance than SBS because the soft segment is saturated olefinic structure, and its physical properties are stronger than SBS, so its application range is wider in production. High-end automobiles, medical equipment materials, toys, wires and cables, etc. SEBS material is non-toxic, will not cause allergies, mutations and rejection to human tissues, has good air tightness, temperature resistance, and aging resistance. It can be directly sterilized by high-temperature cooking and ultraviolet rays, so it can be used as a basic material for medical devices, such Surgical sets, surgical gowns, infusion tubes, tourniquets, blood separators, rubber plugs, etc.