Close relationship between TPE and SEBS
SEBS, full name of Styrene- ethylene-butylene-Styrene. SBS base adhesive was prepared by anionic polymerization with butadiene and styrene as monomers, cyclohexane as solvent, n-butyl lithium as initiator, tetrahydrofuran as activator, silicon tetracloride as coupling agent, and then hydrogenated by cene catalyst. According to the need to add termination agent and anti-aging agent, and then through coagulation, post treatment to prepare SEBS products. The appearance of SEBS particles is white powder.
TPE, English full name Thermoplastic Elastomer, Chinese word meaning Thermoplastic elastomer. Contains many types of elastomers. Such as polymer resin TPEE,TPU, TPAE,SEBS, etc., and polymer blends TPE-S and TPE-V, among which TPE-S thermoplastic elastomer is the blend elastomer of polymer SEBS. In the domestic elastomer market, TPE usually refers to SEBS(SBS) blend modified TPE-S. This kind of TPE, the appearance of transparent or white particles, good color matching.
Therefore, regarding the relationship between SEBS and TPE, SEBS can be regarded as a class of TPE or as the blending base material of TPE(TPE-S).
Why is SEBS mixing with oil?
It is generally understood that pure thermoplastic elastomer SEBS polymers are rarely used directly in the end product. In most applications, SEBS are physically mixed with other components to manufacture the final product (TPE). According to different requirements and different application areas, SEBS can be mixed with a variety of substances, such as oils, other polymers, fillers and additives (antioxidants, pigments) can be made into various blends. The addition of filler oil can increase the fluidity of SEBS. Improve its machining performance; Adjust the hardness of the blend to reduce the cost of the product. The suitable filling oils for SEBS are naphthenic oil and white oil, because these two oils only have good compatibility with EB segment in SEBS and do not dissolve and soften PS phase in SEBS. SEBS products after oil filling continue to maintain stable physical cross-linking. Aromatic filling oil has strong dissolution effect on PS phase in SEBS, which destroys the physical crosslinking network structure of the product and makes the mechanical properties of the product decrease greatly. Relatively speaking, in most application fields, paraffin-based white oil is generally used as SEBS filling oil due to better compatibility between EB segment of middle segment of SEBS and paraffin-based white oil.