Method for extrusion of highly viscous thermosetting material

• Main Authors: MELEKHOVA, GALINA D, ZHEREBTSOV, EVGENY R, ABRAMOV, VSEVOLOD V, IOVDALSKY, NIKOLAI V, SOKOLOV, ANATOLY D, MINAKOVA, ALLA N, AKUTIN, MODEST S, MENSHUTIN, VASILY P, USTKACHKINTSEV, ALEXANDR N
• Format: Patent
• Language: English
• Published: 27.05.1980
• Subjects: AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; PERFORMING OPERATIONS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

A method for extrusion of a highly viscous thermosetting or a thermoplastic material comprising extrusion of said material in the presence of substances diminishing external friction of the melt, at a ratio between internal and external friction values of the material melt within the range of from 1.5 to 4.0; the thermosetting material melt viscosity being ranged from 50x106 to 300x106 poises, while the thermoplastic material melt index being varied from 0.01 to 0.1 g/10 min. The ratio between internal and external friction values of the material melt is maintained within the above-specified range by way of incorporation, into the starting thermosetting or thermoplastic material, of certain compounds. For thermosetting materials, use is made of, e.g. zinc dialkyldithiophosphate, and for thermoplastic materials barium sulphonate is used as such a compound. The extrusion method according to the present invention makes it possible to perform granulation of a thermosetting material so that the resulting granules are not subjected to a premature curing, agglomeration upon storage and can be processed into articles by any conventional method. In the extrusion-moulding of thermoplastic materials the final shaped articles do not substantially swell or change their shape. Furthermore, the method according to the present invention makes it possible to increase the product output due to an increase of the extrusion speed to 300 m/min.