DE2302564

Polyurethane elastomers made from diisocyanates, polyhydroxyl compounds (molecular weight 800-3500), glycols (molecular weight up to 300) and optionally triols (molecular weight up to 500) are produced in screw machines in the presence of lubricants. Self-cleaning, twin-screw machines with corotatin...

Ausführliche Beschreibung

Gespeichert in:

Bibliographische Detailangaben
Hauptverfasser:	EITEL, ALFRED., 5000 KOELN, JAKOB, ROLF, 5090 LEVERKUSEN, ERDMENGER, RUDOLF., 5070 BERGISCH GLADBACH, ULLRICH, MARTIN, MEISERT, ERNST, HEDERICH, MANFRED, STELTE, BERNHARD
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY CHEMISTRY COMPOSITIONS BASED THEREON MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS MAKING GRANULES OR PREFORMS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL PREPARATION OR PRETREATMENT OF THE MATERIAL TO BESHAPED RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIALCONTAINING PLASTICS SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS THEIR PREPARATION OR CHEMICAL WORKING-UP THEIR RELEVANT APPARATUS TRANSPORTING WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Online-Zugang:	Volltext bestellen
Tags:	Tag hinzufügen Keine Tags, Fügen Sie den ersten Tag hinzu!

Beschreibung
Zusammenfassung:	Polyurethane elastomers made from diisocyanates, polyhydroxyl compounds (molecular weight 800-3500), glycols (molecular weight up to 300) and optionally triols (molecular weight up to 500) are produced in screw machines in the presence of lubricants. Self-cleaning, twin-screw machines with corotating screw shafts are used. In one screw zone therein, in which the kneading elements mix vigorously (kneading frequency up to 15 Hz), the critical reaction phase, in which the reaction mixture is highly tacky and has a viscosity of between 20 and 70 Pa.s, is passed through at a velocity gradient in the radial play between the comb and the housing wall of greater than 2000 s. The consequence of this is a homogeneous knot-free end product. The process enables the thermoplastic end product to be extruded directly with shaping.