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Thursday, 19 September 2019
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Raw materials & technologies, Technologies

Fast drying primer reduces time lost for recoatability

Monday, 9 March 2015

A new polyurethane primer participates in the coating cycle anticorrosion effect along with good adhesion and flexibility for post forming processes.

The 2k PU metal primer system can be applied to containers and trains. Source: Pixelio

The 2k PU metal primer system can be applied to containers and trains. Source: Pixelio

Standard chemistry used for this kind of application is based on epoxy, amino and acrylic system, which require high production cost for the curing, in terms of equipment (furnace, heating room, industrial oven) and time for the recoatabily. Sapici has introduced a 2k PU metal primer system now able to save energy and time, with a profitable effect on the entire production chain.

A new generation isocyanurate

"Polurgreen XP AB” is a new generation isocyanurate combining in just one product all the following features: fast curing, high solid and low viscosity, good compatibility with a broad range of resins and flexibility. The characteristics of this new polyurethane can be magnified if joined with resins, acrylic saturated polyester and alkyd, such as "Rexin LS124”. Moreover, the combination of the PU system with the correct filler allows to add more than 40% of filler, to formulate a fast curing high solid primer.

Eliminating phoshate treatment

The system can reach the touch free in just 30 minutes at room temperature, or less than half the time compared to epoxy systems. Furthermore, it requires only 45 to 60 minutes to dry. The system has been applied to containers and trains, where the short curing and recoatability time improves the productivity while keeping high quality level. In addition, it can be employed in place of powder coating cycles, allowing the elimination of phoshate treatment, though keeping the same level of corrosion resistance and without using the oven (at 230°C), thus enabling energy saving.

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