Extensive series of trials in the wet operations and finishing sector have shown that it is possible to fulfil the requirements regarding the ageing properties, at least in the case of highly pigmented car upholstery leathers, by selecting suitable processes and products. While the resistance to mechanical influences, and to heat and light, e.g. according to DIN 75 202, is primarily determined by the properties of the finish, the hydrolysis properties on simultaneous exposure to heat and humidity depend on the type of tannage and the tanning products used. Colour changes can only be avoided by the use of selected finishing products in combination with elevated amounts of pigment in the top coat. The best results with regard to heat/light ageing and hydrolysis resistance were obtained with wet blues retanned with selected synthetic and vegetable tanning materials in combination with mainly softening, acrylic-based polymers. Chrome-free leathers treated with similar products also achieved good heat/light ageing properties. A continuing problem is the highly unsatisfactory lightfastness of the resultant chrome-containing and chromefree crust leathers, which prevents the use of low-pigment and therefore more attractive finishes for car upholstery leathers. Thus research scientists will have to continue their search for ways of producing lightfast crust leather with improved thermostability. Finishes formulated with special heat and light-stable pigments, acrylic and polyurethane dispersions and suitable auxiliaries make it possible to meet most of the demands concerning the ageing properties of automotive upholstery leathers. With automotive upholstery leather, as with other types of leather, it is generally essential to adapt the test methods and specifications to suit the particular field of application and type of tannage.
The effect of products and production processes on the ageing properties of automotive upholstery leather
Der Einfluss von Produkten und Produktionsprozessen auf die Alterungseigenschaften von Autopolsterleder
2001
6 Seiten, 1 Tabelle, 4 Quellen
Conference paper
English
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