11. January 2019

Colouring and coating of polyurethanes

The Kürten-based German company ISL-Chemie GmbH & Co. KG, who has been a producer of pigment pastes, dyes, In-Mould-Coatings and additives for 50 years, will be presenting long-term proven products for the colouring and coating of polyurethanes at PSE Europe 2019 from 26 – 28 March 2019 in Munich, Germany.

The reactive dyes of the Moltopren S product range are low viscous and stand out with their high colour brilliance as well as colour strength. Thanks to an optimum integration of the reactive dye via hydroxyl-functional groups into the polyurethane foam via hydroxyl-functional groups the so-coloured foams will not bleed. Reduced streaking and an improved settling behaviour are further advantages of the Moltopren S product range. The product range is continuously expanded so that more and more colour shades become available, said the manufacturer.

Foams made from polyurethane get added value by using Isochrom pigment pastes with thermochromatic pigments. The colour shade of the final product can change at a temperature at e.g. 40 °C and thus shows that the coloured product still has a certain temperature. By combining thermochromatic pigments with standard pigment pastes, colour shade changes can be achieved within various temperature ranges and offer functional benefits.

According to ISL-Chemie, especially in the automotive industry high-quality surfaces with effects are more and more in demand by end-users. However, processing the expensive pigments is often challenging as they have a tendency to settle. The desired effect is often not achieved as the pigments used can hardly be seen in the final application, for example a surface coating. Thanks to its long-term expertise with the dispersion of pigments ISL-Chemie has succeeded in stabilising special Isopur effect pigments for the use in polyurethane coatings in a way that they can be perceived with the desired intensity in the final application, even in thicker coatings.

Plastic parts are coated directly in the mould using the In-Mould-Coating (IMC) process. The IMC process is already established for the production of steering wheels, dashboards and many other applications within the automotive interior area. Post-painting of the parts is no longer necessary and thus time and money can be saved. The Isothan NT paint for corresponding applications features high surface quality, very good UV stability as well as chemical resistances.

In-Mould-Coatings from ISL-Chemie stand the test in applications like e.g. the PU-Spray-Skin method. Here an aromatic PU system is sprayed into a pre-tempered mould. The final surface of the spray skin is refined and protected and pleasant haptics are achieved by using Isothan In-Mould paints which are sprayed into the mould at first. Fast colour shade changes as well as multi-coloured PU parts are possible using spray skin technology. The technology can be used for dashboards, glove compartment lids, door trim panels or armrests and other parts and offers reduced weight as well as general costs savings compared to other technologies. The coated surfaces offer outstanding UV, abrasion and chemical resistances.

www.isl-chemie.de

URL: https://www.gupta-verlag.com/news/technology/22399/colouring-and-coating-of-polyurethanes