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SEBS , SBS thermoplastic styrene-butadiene rubber copolymer, in the form of powder (SEBS) or dry rubber (SBS), although it is a thermoplastic material, it is difficult to plasticize directly due to its high viscosity. SEBS and SBS have good oil-extending properties (SEBS and SBS can absorb oil). By extending the oil, the viscosity of SEBS materials can be reduced and the processing performance can be improved. In the actual blending modification, based on the consideration of compatibility and practicality , usually more components are added to prepare more functional TPE materials.
(1) The more orthodox SEBS compounding system is as follows:
SEBS+oil+PP(optional)+stone powder(optional)+auxiliaries(optional);
(2) The more orthodox SBS compounding system is as follows:
SBS+oil+PS(optional)+stone powder(optional)+auxiliaries(optional).
How to differentiate TPE for SEBS and SBS substrates
First, the TPE particles of all SEBS substrates appear subsurface; while the TPE particles of SBS substrates appear bright. In addition, there are some specific distinguishing methods:
1. The hardness is less than 30A
For this kind of low hardness SEBS, TPE of SBS substrate. Generally, the tensile elongation performance of TPE of SBS substrate is not as good as that of SEBS substrate, and TPE of SBS substrate is more sticky to the touch than TPE of SEBS substrate.
2. Hardness 35~70A
About this hardness range. The TPE of SEBS substrate burns, the smoke is not as thick as that of TPE of SBS substrate, and the combustion flame is yellow. For TPE based on SEBS, the main body of the combustion flame is yellow, and the root of the flame may be blue.
3. Hardness above 75A
Due to the large proportion of PS and the fact that SBS itself contains styrene, the TPE of this hardness SBS base material has an obvious aroma when burning; of course, the smoke is darker when burning. The burning flame is yellow;
Due to the large proportion of PP, the TPE of this hardness SEBS base material has a lighter aroma when the material is burned, and the unique petroleum smell of PP is more obvious. When burning, the smoke is relatively light, and the root of the flame is blue in color.
