BEHAVIOUR OF IR REFLECTIVE DYES AND PIGMENTS ON DIFFERENT FATLIQUORED UPHOLSTERY LEATHERS

Abstract

IR Reflective dyes and pigments are designed to make absorption in the visible region of the electromagnetic spectrum like the standard dyes but to reflect the Infra-Red region of the spectrum as a difference; which enables the items dyed with them to heat less for darker shades when exposed to sunlight. In this study, a standard acid dyestuff and an IR reflecting acid dyestuff are used on leathers produced with 4 different fatliquoring processes. They are finished with standard and IR reflective pigments respectively. Then reflection behaviors of the resulting leathers were measured with an IR spectrophotometer to visualize the working theory. Later, the fastness properties of leathers were tested to see if they are applicable to leather articles and resistant to wear. Spectrums showed that black IR reflective dyes and pigments stop absorbing and start reflecting light with wavelengths above 700 nm which results cooler leathers under solar radiation. Rubbing fastness results showed that leathers, treated with IR reflective dyes and pigments, had better results with a slight difference than other standard acid dyestuff groups, which proved the durability of this application during wearing. When different fatliquoring processes were compared, it was not seen significant differences in final colors, reflection properties, and rubbing fastness results.

Keywords

• leather
• ir reflective
• dyes
• dyestuff
• pigments