55th Dornbirn man-made fibers congress 2016

Erstellt am: 2. Jan 2017

Environmental friendly resorcinol-formaldehyde free adhesive systems for man-made fiber-rubber composites

Man-made fibers are commonly treated by a resorcinol-formaldehyde-latex (RFL) coating in order to obtain desired adhesion to the rubber matrix. Formaldehyde has been recently classified as carcinogenicity Cat. 1B substance and according to the sixth adaptation to technical and scientific progress these new legal obligations apply to producers, importers and downstream users.[1] As a result of this re-classification, mixtures containing free formaldehyde contents of 0.1% or more are required to be labelled as carcinogenic i.e. H350, may cause cancer. Since Resorcinol is also in focus, therefore, there is an immediate need to look for alternative cross-linking systems for technical fiber reinforcements in the field of mechanical rubber goods (MRG). Our work deals with the development of resorcinol-formaldhyde free dip coating formulations, for adhesion enhancement between man-made fibers and rubber matrix. We tested several formulations consisiting of VP, SBR, NBR and CR latex dispersions alongwith water dispersible resin and crosslinkers. These water-based, environmental friendly dip coating formulations are applied in a single dipping process to pre-activated PET and Aramid yarn and fabric reinforcements, resulting in enhanced adhesion to NR, NBR, EPDM and CR rubber compounds.

[1] 6th ATP: Commission regulation (EU) No 605/2014 of 5 June 2014

Qasim Shaikh1, Olaf Brauckmann1, Matthias Mehler 1
E-Mail (qasim.shaikh@mehler-ep.com)