Difference between revisions of "Crosslinker"
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==Crosslinker as additive== | ==Crosslinker as additive== | ||
| − | The binders of the [[finish#Primer - Finish / Top Coat|top coats]] and [[leather | + | The binders of the [[finish#Primer - Finish / Top Coat|top coats]] and [[leather colour|pigment leather paints]] are generally based on polyurethane. "Crosslinkers" are additives which are used in aqueous top coats and pigment paints based on polyurethane. The crosslinker "crosslinks" the polyurethane binders and thereby ensures the necessary [[leather quality|fastness properties]] of the leather surface. By "cross-linking", the leather surfaces of [[finish|pigmented leather]] it is more resistant to [[leather damages|abrasion, moisture or solvents]]. |
Isocyanate crosslinkers have proven particularly effective in demanding surfaces such as [[car leather|automotive leathers]]. Isocyanate crosslinkers do not yellow and are also very resistant to aging. To this end, isocyanate crosslinkers are easy to use and are not harmful to health or the [[Environmental protection|environment]] after processing. | Isocyanate crosslinkers have proven particularly effective in demanding surfaces such as [[car leather|automotive leathers]]. Isocyanate crosslinkers do not yellow and are also very resistant to aging. To this end, isocyanate crosslinkers are easy to use and are not harmful to health or the [[Environmental protection|environment]] after processing. | ||
Revision as of 20:33, 18 February 2017
Contents
Crosslinker as additive
The binders of the top coats and pigment leather paints are generally based on polyurethane. "Crosslinkers" are additives which are used in aqueous top coats and pigment paints based on polyurethane. The crosslinker "crosslinks" the polyurethane binders and thereby ensures the necessary fastness properties of the leather surface. By "cross-linking", the leather surfaces of pigmented leather it is more resistant to abrasion, moisture or solvents.
Isocyanate crosslinkers have proven particularly effective in demanding surfaces such as automotive leathers. Isocyanate crosslinkers do not yellow and are also very resistant to aging. To this end, isocyanate crosslinkers are easy to use and are not harmful to health or the environment after processing.
Aziridine crosslinkers are common in furniture leather.
Crosslinkers generally contain organic solvents. These are necessary in order to achieve a sufficient mixing with the substance to be cross-linked. The manufacturers of crosslinker are trying to reduce this solvent proportion to zero.
Other top coat additives
In addition to the crosslinkers, there are much more additives for the Top Coat. Some additives change the haptic evaluation of leather surfaces. Additives influence if the leather feels more waxy, blunt or smooth.
Spinn web effect by aziridine crosslinker
In the first generations of aziridine-based crosslinkers, the so-called spider web effect occured. The phenomenon is known from the previous century. The crosslinker reacted with time and became so hard that the surface broke years later and a fracture pattern similar to that of a spider web arose. Jaguar and other British brands were affected. Nowadays, this problem is under control.
Cracking of the surface due to excessive crosslinking of the aziridine crosslinker.
Additional information
a kotori web solution