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Powder Coatings

Cool Powder

Cool Powder

Polyester Powder Coating for Low Temperature Curing

In the last few years, the environmental sensitivity has been a crucial social issue. The studies carried out by the IPCC (Intergovernmental Panel on Climate Change) have clearly and unequivocally determined that the reduction of the carbon dioxide emissions (as provided for by the Kyoto treaty) is fundamental in order to ensure a liveable world for the future generations.

The manufacturing companies must therefore use new processes and/or new materials allowing a reduction in the energy consumed and consequently in the amount of CO2 in the atmosphere – a sign of great responsibility and great respect for the environment.

Cool Powder is a polyester powder coating line suitable for polymerization at 150°C for “General Industrial” applications, more and more required by the market. It is characterised by:

  • good mechanical properties;
  • excellent weather and UV radiation resistance;
  • low temperature curing: 150°C instead of the traditional 180°C

The low temperature curing offers three advantages:

  • economical, the lower curing temperature with respect standard curing powders reduces energy consumption, electricity or gas, which it is necessary to bring powder coatings to complete hardening;
  • environmental, reducing electricity or gas consumption means also reducing carbon dioxide’s emissions (carbon dioxide is considered to be the primarily responsible for the greenhouse effect by most scientists and, therefore, for the global warming of our planet);
  • technical, becomes easier coating of thick objects, with a high thermal mass, which can hardly reach 180°C in the oven.

The above mentioned features do not negatively impact on the general characteristics of this powder coating line. Its excellent outdoor performances are summarised in the graph below (left), which shows the gloss retention of several RAL tones in the accelerated aging test. Its mechanical properties fully meet the traditional market standards too. Some of the mechanical tests performed on these finishes are shown on figure below (right).

Cool Powder products are also available in Superdurable Polyester version, too.
The traditional superdurable polyester powder coatings based on HAA hardener (β- hydroxyalkylamide) are usually formulated for curing cycle 20 min at 180°C or higher. Other types of hardener (e.g. based on TGIC-free glycidylester) allow curing cycle at lower temperature because, unlike HAA, these ones could be catalyzed. However, glycidylester-based hardeners have not a safe toxicological profile (irritant) and, for this reason, are not easily accepted by the market. These hardeners also negatively affect the glass transition temperature of powder coating, making critical the storage stability and other chemical-physical characteristics of the coating.
The ST Powder Coatings R&D department has developed a new system based on an innovative hardener that allows the curing cycle at 160°C without the above mentioned negative aspects of glycidylester-based ones. This new line, “Cool SD Powder”, has also outstanding UV resistance.

The general characteristics of this new powder coatings line are:

surface appearance: smooth
brightness: 70-90 gloss
curing cycle: 160°C x 10 min (object’s temperature)
mechanical properties: some micro-cracks after impact test, which is typical of superdurable coatings, without film detachment.

The UV radiation’s resistance are shown in the next graph (colour RAL 2002):

ST Cool Powder coatings are available in these versions:

Finishes Gloss
smooth glossy, half-glossy, half-matt
fine texture half-matt, matt
coarse texture glossy

Colour: yellow, red, blue, green, grey, black, white, orange, pink, ivory, brown and coloured transparent. Available also in metallic version.

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