TPE/TPR elastomer transparency and its influencing factors

  • Time of issue:2022-01-08
  • Views:0

TPE/TPR elastomer transparency and its influencing factors

  • Categories:Elastomer knowledge
  • Author:SPP
  • Origin:en.tpe-sp.com
  • Time of issue:2022-01-08
  • Views:0

Regarding the flexibility of elastomeric TPEs and TPRs, the choice of components from the dosing system requires only the selection of suitable SEBS, SBS base materials, suitable plastic (e.g. PP, PS) grades, no fillers, toners, flame retardants and other functional additives that can be mixed and synthesized to produce transparent TPE, TPR pellets. However, depending on the specific brand specifications of each component of the system, the distribution ratio of each group will have an impact on the transparency of the TPE and TPR materials. The following is a rough analysis shared.

  1.The effect of molecular weight structure of SEBS,SBS origin on transparency

  Origin: Koten, Kuraray > TSRC > Yuehua, referring to the SEBS substrate of each origin, mixed with the treated TPE, the transparency of the superior and inferior order. In recent years, Yuehua SEBS dehydrogenation treatment has upgraded the transparency of TPE mixed products.

  Molecular weight: For the same source, the transparency of the blended TPE generally decreases as the molecular weight of SEBS increases.

  Branching degree: For the same source of SEBS with the same molecular weight, the higher the molecular chain branching degree, the lower the transparency of the treated TPE.

  2. Oil quality and addition amount

  Hydrogenation degree: Choose oil with high hydrogenation (e.g. three times hydrogenation), which is good for the transparency and yellowing resistance of TPE material.

  Addition amount: The larger the proportion of mixed oil, the better the transparency of the TPE and TPR materials finally synthesized through the blending system (the lower the hardness of the materials).

  3. The influence of plastic resin addition

  In order to improve the strength of TPE and TPR materials, a certain amount of PS or PP plastic is usually added to the blending system. In order to maintain the transparency of the material as much as possible, the specifications of PS and PP on the one hand and the choice of origin on the other hand, and the addition of plastic should be considered. The quantity is also an important factor affecting the transparency of TPE and TPR. Usually, as the amount of added plastics (PS, PP) increases, the hardness of the compound's TPE and TPR increases and the transparency of the material gradually decreases, and the TPE of SEBS substrate decreases more than the TPR of SBS. Substrates. It is obvious.

  The transparency of TPE, TPR materials and its influencing factors are analyzed above from the perspective of raw material formulation. For high transparency TPE and TPR, engineers undoubtedly need to consider many factors. For TPE, TPR material procurement needs, if you want to process high transparency TPE, TPR products, in addition to the selection of high transparency TPE, TPR brand, you also need to pay attention to the selection of the appropriate processing temperature.

  Highly transparent TPE (based on SEBS substrate):Hardness 0~70A.

  Highly transparent TPR (based on SBS substrate): hardness 10~90A.

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