Flat thermoset polyurethane composite

• Main Author: UWE BUELTJER, DIETER EIMER, GERHARD ZEITLER, ERHARDT REICH, AXEL SIEKMEYER ET HANS JOACHIM WECKERT
• Format: Patent
• Language: English; French
• Published: 02.11.1984
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; CHEMISTRY; COMPOSITIONS BASED THEREON; GENERAL PROCESSES OF COMPOUNDING; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL; WORKING-UP

Flat composite (I) 1-20 mm thick, with density 0.1-1.6g/cub.cm., flexural strength (DIN 53423) 5-60 Pa, E modulus in flexure (DIN 53457) 500-6000 Pa, impact strength (DIN 53453) 5-50 kJ/sq.m., and heat flexural resistance temp. (DIN 53424) 110-250 deg.C., comprising a cellular polyurethane (PU) thermoset having embedded 51-80 wt.%, on total wt., of a fibre-contg. flat object (II). Prodn. of (I) by (a) laying a (II) in open mould and spraying with amt. of foamable PU thermosetting mixt. having viscosity 200-2000mPa-s at 20 deg.C and gel time 15-240 seconds at 80 deg.C such that wt. ratio of (II) to foamable PU mixt. is 51-80:49-20, or laying analogously obtd. (II) sprayed with foamable PU mixt. in open mould; (b) closing mould; (c) alloying PU mixt. to foam and harden in closed mould. CORPS COMPOSITES PLANIFORMES EN POLYURETHANNE ET FIBRES, LEUR PREPARATION ET LEURS UTILISATIONS.CES CORPS COMPOSITES ONT UNE EPAISSEUR DE 1 A 20MM, UNE DENSITE DE 0,1 A 1,6GCM, UNE RESISTANCE A LA FLEXION (DIN 53423) DE 5 A 60PA, UN MODULE D'ELASTICITE A LA FLEXION (DIN53457) DE 500 A 6000PA, UNE RESILIENCE (DIN53453) DE 5 A 50KJM ET UNE RESISTANCE A LA FLEXION A CHAUD (DIN53424) DE 110 A 250C ET CONSISTENT EN UN DUROMETRE ALVEOLAIRE DE POLYURETHANNE CONTENANT A L'ETAT NOYE 51 A 80 EN POIDS, PAR RAPPORT AU POIDS TOTAL, D'UN ARTICLE PLANIFORME FIBREUX. ON PREPARE CES CORPS EN PULVERISANT L'ARTICLE PLANIFORME DANS L'OUTIL DE MOULAGE OUVERT PAR UN MELANGE EXPANSIBLE DE POLYURETHANNE ET EN FAISANT REAGIR SOUS COMPRESSION DANS LE MOULE FERME.