Use of fluoropolymer permanent release coatings for molded polyurethane foam production

• Type: Article in International Scientific Journal
• Date: 2012

Authors

Leandro Figueiredo (Author) FEUP; Pedro Bandeira (Author) FEUP; Adélio Mendes (Author) FEUP; Margarida M. S. M. Bastos (Author) FEUP; Fernão D. Magalhães (Author) FEUP

Journal

Title: Journal of Coatings Technology and Research

Vol. 9 No. 6

Pages: 757-764

ISSN: 1945-9645

Publisher: Springer

Indexing

ISI Web of Knowledge - 3 Citations

ISI Web of Science

Scopus - 4 Citations

INSPEC

Scientific classification

FOS: Engineering and technology > Materials engineering

Associated Projects

PEst-C/EQB/UI0511/2011 - PROJECTO ESTRATÉGICO - UI 511 - 2011-2012

Other information

Authenticus ID: P-002-42Z

DOI: 10.1007/s11998-012-9413-y

Abstract (EN): The problem of adhesion of polyurethane foams to fluoropolymer permanent release mold coatings was studied. Two coatings, based on polytetrafluoroethylene (PTFE) and perfluoroalkoxy polymer (PFA) aqueous dispersions, respectively, were applied on aluminum plates, and the foam release performance evaluated. The PTFE coating displayed gradual loss of antiadhesion properties with consecutive exposure to the reactive mixture, which was associated with isocyanate surface penetration. Penetrant mass uptake experiments, performed on free films, indicated that PTFE retains about 10 times more isocyanate than PFA, probably because of its porous surface morphology. A synergistic effect was found by applying a very small quantity of a waterborne release agent on the PTFE coating, before every foam molding cycle. The release agent formed a protective barrier that minimized contact of the coating with the reactive mixture, allowing for stable and robust foam release performance. The problem of polyurea build-up, associated with the use of aqueous release agents, was not observed because of the small amounts of compound used.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 8