摘要:
White or near-white antistatic ultra-high molecular weight polyethylene (UHMWPE) is obtained by consolidating a mixture of UHMWPE powder and an organic antistat at high pressure and elevated temperature. The organic antistat is preferably a non-ionic solid which has been cryogenically ground to fine particle size.
摘要:
A method of manufacturing a composite gear blank comprises placing a rigid centerpiece (2) in a non-rotating mold (10, 12, 28), inertizing the mold, adding a liquid reactive mixture (M) until filling up the mold around the centerpiece, applying a static pressure to the filled up mold and allowing polymerization of the reactive mixture so as to form a plastic outer part surrounding the centerpiece. The composite gear blanks thus made have improved values of normal and shear adhesion strength both at room temperature and at elevated temperatures of up to 12O°C and are particularly suited for making worm gear parts of automotive electronic power steering systems.
摘要:
UHMWPE panels of large width may be ram extruded from a slit die in a stable process, by restraining a panel which exits the die below the crystalline melt temperature against movement away from the die by a back pressure device, so as to exert a back pressure between the back pressure device and the die, the back pressure device preferably constructed of a plurality of differentially adjustable elements so as to be able to compensate for changes in processing characteristics over time. Vertically restraining UHMWPE panels as they further cool also greatly improves product characteristics.
摘要:
Composite worm gears having little residual stress are prepared by forming a tube (101) of synthetic resin by extrusion, compression molding, or centrifugal processing, and fixing the tube thus produced or rings (102) cut therefrom onto a boss (103) or core (105), preferably of metal. The process allows high performance high molecular weight thermoplastics to be employed.
摘要:
Composite worm gears having little residual stress are prepared by forming a tube (101) of synthetic resin by extrusion, compression molding, or centrifugal processing, and fixing the tube thus produced or rings (102) cut therefrom onto a boss (103) or core (105), preferably of metal. The process allows high performance high molecular weight thermoplastics to be employed.
摘要:
Internal components of plasma reactors are composed of a toleratable, ceramic filled plasma-useful polymer such as a high temperature engineering thermoplastic, preferably a polyamideimide. The parts exhibit a low erosion rate upon exposure to plasma at low pressure.
摘要:
It has now been surprisingly and unexpectedly discovered that a combination of polychlorophenoxyphenol, a silver-containing biocide, and an organopolysiloxane, when added to UHMWPE, renders the UHMWPE resistant to both soft and hard fouling. The polychlorophenoxy phenol is preferably 2.4.4'-trichloro-2'-hydroxy-diphenylether and the metal-containing biocide is preferably a silver zeolite.
摘要:
UHMWPE panels of large width may be ram extruded from a slit die in a stable process, by restraining a panel which exits the die below the crystalline melt temperature against movement away from the die by a back pressure device, so as to exert a back pressure between the back pressure device and the die, the back pressure device preferably constructed of a plurality of differentially adjustable elements so as to be able to compensate for changes in processing characteristics over time. Vertically restraining UHMWPE panels as they further cool also greatly improves product characteristics.