Non-Stick Coatings in Aluminium Molds for the Production of Polyurethane Foam

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Author
Sánchez-Urbano, Francisco
Paz-Gómez, Guillermo
Rodríguez-Alabanda, O.
Romero, Pablo E.
Cabrerizo-Vílchez, Miguel
Rodríguez-Valverde, Miguel Ángel
Guerrero-Vaca, G.
Publisher
MDPIDate
2018Subject
Non-stick coatingsPolyurethane foam
Aluminium molds
FEP
PFA
RTV silicone rubber
Sol-gel
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The manufacturing of polyurethane foam is a process of great industrial importance in the
automotive and furniture sector. The operation of demolding is the most delicate, since the foam
sticks firmly to the walls of the mold onto which it has spread. In order to avoid the use of demolding
agents, the proposal is to coat the inside of the molds with non-stick coatings. In this work, three types
of different coatings were studied: fluoropolymers, ceramics, and elastomers. After carrying out
different tests in the laboratory, two fluoropolymer coatings (PFA (perfluoroalkoxy) and PTFE
(polytetrafluoroethylene)) were selected for a test at the industrial level and, after 1500 cycles
of demolding, it was experimentally proven that the PFA coating is the most adequate for the
use studied