Difference between revisions of "Crosslinker"

Revision as of 20:33, 18 February 2017

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

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-==Vernetzer als Additive==
+==Crosslinker as additive==
-Die Bindemittel der [[Top Coat|Top Coats]] und [[Lederfarbe|Pigmentfarben]] sind i. d. R. auf Polyurethanbasis. '''"Vernetzer"''' oder englisch '''"Crosslinker"''' sind Additive, die in wässrigen Top Coats und Pigmentfarben auf Polyurethanbasis eingesetzt werden. Der Vernetzer "vernetzt" die Polyurethanbindemittel und sorgt dadurch für die notwendigen [[Echtheiten]] der [[Leder]]oberfläche. Durch die "Vernetzung" werden die Lederoberflächen [[Zurichtung|pigmentierter Leder]] resistenter gegen Abrieb, Feuchtigkeit oder Lösungsmittel.
+The binders of the [[finish#Primer - Finish / Top Coat|top coats]] and [[leather coloour|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]].
-Insbesondere bei anspruchsvollen Oberflächen wie [[Autoleder|Autoledern]] haben sich Isocyanat-Vernetzer bewährt. Isocyanat-Vernetzer vergilben nicht und sind auch sonst sehr alterungsbeständig. Dazu sind Isocyanat-Vernetzer leicht anzuwenden und nach der Verarbeitung ungefährlich für die Gesundheit oder Umwelt.
+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.
-Bei [[Möbelleder|Möbelledern]] sind Aziridin-Vernetzer verbreitet.
+Aziridine crosslinkers are common in [[leather furniture|furniture leather]].
-Vernetzer enthalten i. d. R. organische Lösungsmittel. Diese sind notwendig, um eine ausreichende Vermischung mit der zu vernetzenden Substanz zu erreichen. Die Hersteller versuchen diesen Lösungsmittelanteil zukünftig auf Null zu reduzieren.
+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.
-==[[Haptik|Griffmittel]] als Additive==
+==Other top coat additives==
-Neben den Vernetzern gibt es aber noch eine weitere Anzahl von Additiven für den [[Top Coat]]. Dazu zählen auch die Griffmittel. Griffmittel verändern den "Griff" (die [[Haptik]]) des Leders. Über ein Griffmittel steuert man, ob sich ein Leder mehr wachsig, stumpf oder glatt anfühlt.
+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==
-Bei den ersten Generationen von Vernetzern auf Aziridin-Basis kam es bei der Anwendung bei der Lederzurichtung zum sogenannten Spinnwebe-Effekt. Bekannt ist das Phänomen aus dem vorherigen Jahrhundert. Der Vernetzer reagierte mit der Zeit nach und wurde so hart, dass die Oberfläche Jahre später brach und ein Spinnwebe ähnliches Bruchbild entstand. Jaguar und andere britische Marken waren davon betroffen. Heutzutage hat man dieses Problem im Griff.
+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 [[leather damages|broke years later]] and a fracture pattern similar to that of a spider web arose. [[car leather#Jaguar|Jaguar]] and other British brands were affected. Nowadays, this problem is under control.

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