Reaction injection molding (RIM) elastomers having superior high temperature performance

Abstract

Keaction injection molding (HIM) elastomers are being seriously considered by major automotive companies as a substitute for metal in exterior body panels. One major consideration in this application is dimensional stability at a 325°F paint bake cycle. Kcported here are formulations which via novel processing result in finished parts with excellent dimensional stability at 325°F. In addition, other properties such as impact resistance and flex modulus ratio improve parallel with high temperature performance. Mechanical properties as a function of processing and molding parameters are presented. Other studies are presented and a tentative explanation of the superior performance of' these RIM elastomers is made.

Polyurea RIM: Novel Applications and Technical Advances

“…THE DEVELOPMENT OF polymeric material systems that can be processed via the Reaction Injection Molding or RIM process has been an active field of industrial research for more than a decade [1,2]. Polyurea RIM materials are the most recent development to result from this effort [3][4][5].…”

Amine-Terminated Polyether Resins in Rim

“…Polyurethane chemistry is fast and the resulting elastomers have good strength properties [1,2]. For these reasons polyurethane chemistry has established a niche in the practice of RIM.…”

Συνθεση Χαρακτηρισμος Και Θερμικες Ιδιοτητες Νεων Θερμοανθεκτικων Και Πυρανθεκτικων Πολυμερων Με Τεχνολογικες Εφαρμογες

“…Πρέ πει όμως να τονιστεί ότι η ύπαρξη ουρεϊδο-δεσμών στη δομή ενός πολυμερούς αυξάνει σημαντικά την ευκαμψία της αλύσου με αποτέ λεσμα οι ουρεϊδο-ρητίνες να παρουσιάζουν υψηλότερο βαθμό ευκαμ ψίας από τις αντίστοιχες ιμιδικές και αμιδικές. Η διατήρηση των καλών μηχανικών ιδιοτήτων των ουρεϊδο-ρη'τινών καθώς και των αν τίστοιχων ουρεϊδο-ουρεθανών σε υψηλές θερμοκρασίες έχει τονι στεί από διάφορους ερευνητές (117,118).…”