Reduction of friction of rubbers and plastics - by addn. of polymer material which is depolymerised by irradiation

• Main Authors: CARIUS,GUENTHER, HUNGER,BERND, HEGER,ADOLF,DR, ROTTER,ANITA
• Format: Patent
• Language: English; German
• Published: 08.06.1977
• Edition: 2
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; BEARINGS; BLASTING; CHEMISTRY; COMPOSITIONS BASED THEREON; CYLINDERS; ELEMENTS OR CRANKSHAFT MECHANISMS; ENGINEERING ELEMENTS AND UNITS; FLEXIBLE SHAFTS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; GENERAL PROCESSES OF COMPOUNDING; HEATING; INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULARARTICLES; INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS; LIGHTING; MECHANICAL ENGINEERING; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; PISTONS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; SEALINGS; SHAFTS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; THEIR PREPARATION OR CHEMICAL WORKING-UP; THERMAL INSULATION IN GENERAL; TRANSPORTING; WEAPONS; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL; WORKING-UP

Prodn. of rubbers or plastics with reduced coeffts. of friction involves addn. of an oligomer or polymer which is depolymerised by ionising radiation before or after incorporation. The additive is pref. a fluorine-contg. polymer esp. PTFE. Prods are used in sealing elements e.g. O-rings shaft seals hydraulic and pneumatic packings, pref. of nitrile silicone, acrylate, fluoro SBR chloroprene epichlorhydrin or chlorosulphonated polyethylene rubber polyethylene or PVC. Friction and heat generated in used are reduced, giving extended life. Other properties e.g. strength, hardness, elongation at break, swelling in aggressive media etc. are also improved by the irradiation.