【TPE Encyclopedia】Several types of TPE material surface precipitation

  • Time of issue:2021-10-22
  • Views:523

【TPE Encyclopedia】Several types of TPE material surface precipitation

  • Categories:Elastomer knowledge
  • Author:SPP
  • Origin:www.sptpe.cn
  • Time of issue:2021-10-22
  • Views:523

  I. Several types of TPE material surface precipitation

  The surface precipitation of TPE material is mainly divided into 3 types, 1. spraying frost, 2. spraying wax, 3. spraying oil.

  1、Spraying frost

  One of the most common is spray frost, thermoplastic elastomer TPE-S spray frost is mainly due to the precipitation of antioxidants (antioxidants), the serious case of the material surface obviously a layer of whitening, but usually, do not touch not see whitening, but as long as a touch can be found obviously whitening (with powder), as follows.

  TPE material whitening, in some cases, touch does not appear whitening phenomenon, but need to scrape hard, commonly known as "scraping white", this is usually due to the filler added too much, and the filler is not a good surface treatment. The usual solutions are: a. simply do not add filler, b. coupling treatment of filler, c . Scratch-resistant treatment of the material surface.

  2、Spray wax

  Common spray wax, can also be said to be an excess of lubricant, common polyethylene wax, stearic acid, stearate, erucic acid and other excess, there is a situation that needs to be noted that for silicone masterbatch (polysiloxane) and so on, itself tends to precipitate to the surface of the material, contact with the mold, add the amount, as little as possible. Some waxes are somewhat synergistic with each other, while others are more likely to cause precipitation.

  Spray wax manifestation, generally will not appear scratch white phenomenon, but will appear shiny scratch, of course, in serious cases, but will be sticky feeling, if the material itself and the phenomenon of spray frost, it is sticky and white.

  3、Spraying oil

  The phenomenon of oil spraying, mainly because the material is filled with too much oil, in the case of low temperature, the material increases the crystallinity, resulting in part of the original distribution in the amorphous area of the oil migration to the surface, the other case, is the reverse, in the case of high temperature, SBS / SEBS and other material molecules increase the movement, reducing the ability to lock the oil, resulting in the oil also migrated to the surface.

  The improvement of oil spraying phenomenon is mainly to make the filling oil match the SEBS/SBS base material as much as possible, and don't fill excessive oil for low molecular weight styrene elastomer. Paraffin-filled oils are relatively drier to the touch, but naphthenic oils are actually more compatible with SEBS/SBS.

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