Close
Plasma treated powders for rotational moulding

Powders for rotational moulding (more info on http://en.wikipedia.org/wiki/Rotational_molding) – plasma treatment of powder enables to increase surface energy of particles, which is kept also after sintering on the product surface. It leads to higher wettability and adhesion capability of the product surface. Material is though suitable for applications requiring very good adhesion such as:

Products sintered from plasma treated powder are directly prepared for final processing without any additional pretreatment such as flame, chemical or mechanical processes.

Enhanced adhesion properties can be used in following areas of production:

  • production of foamed parts or boxes by PUR foam ) for example seats or insulated boxes – advantage – simpler construction by means of higher strength of the final product.
  • so called multilayer rotomolding – creation of inner barrier layer
  • production of parts with inserts such as valve, outlet, etc.

There are some types of powders for rotational moulding which we processed by plasma treatment. Portfolio is widening according to demand and our development:

  • BORECENE RM 8343
  • mPE M 3581 UV S01
  • LUPOLEN 3621 M RM
  • SURPASS RMS 244 UG
  • DOWLEX 2631.10UE
  • ICORENE 3590

Stability of the plasma treatment – treated material can be stored under standard conditions for long time period without loss of modification effect.

Measurement of the effect by Washburne method you can see in the section Testing methods – Wettability – powder materials. It shows that even after 1 year there are the same values as just after treatment and loss approx. of 20 % after 3 years was measured.

Measurement of surface energy on sintered surface is described in the section Testing methods – Wettability – 3-D objects surfaces.

Plasma surface treatment effect

  • sintered samples after treatment – surface energy 44 mN/m
  • sintered samples from untreated powder – surface energy 30 mN/m
  • limit value for good adhesion – 38 mN/m
  • always depending on the type of material and modification grade with regard to the sample sintered from untreated powder

Test on the sintered surface from untreated powder – surface energy is below the limit of 38 mN/m. (Arcotest Quicktest® 38)

Test on the sintered surface from plasma treated powder – surface energy is 38 mN/m or above. (Arcotest Quicktest® 38)

Practicle example of testing inks for surface energy measurement you can see in video sequence Surface energy of sintered surfaces.

Our offer in the area of hydrophilisation of powder materials you can find in the section Services.