Preparation method of polyurethane composite bearing of double-layer structure

Abstract

The invention discloses a preparation method of a polyurethane composite bearing of a double-layer structure and belongs to the technical field of sliding bearings. The polyurethane composite bearingis composed of a hard polyurethane outer layer (2) achieving the supporting and bearing effects and a soft polyurethane surface layer (1) with the self-lubricating and anti-abrasion functions. Firstly, a cylinder mold is adopted, the soft surface layer is cast through a centrifugal casting method, and the outer surface of the surface layer is ground, cleaned, dried, and then coated with an adhesion agent to serve as a mold core; and then the hard outer layer is cast on the outer surface of the surface layer, and the bearing is formed by adhering and composing the layers through the adhesion agent. According to the preparation method of the polyurethane composite bearing of the double-layer structure, the bearing has the technical characteristics of being high in bearing, capable of achieving water-breaking operation within a short time, resistant to silt, easy to machine, low in cost and the like, and the domestic market vacancy is made up; and a composite material integrally has the excellent properties of being resistant to changing of the high and low temperature and hydrolysis and the like, the service life is long, and the polyurethane composite bearing can be widely applied to the rotary or swing sliding portions of water pumps, propeller stern bearings, rudder bearings and the like.

Description

technical field [0001] The invention belongs to the technical field of sliding bearings, in particular to a preparation method of a double-layer structure polyurethane composite bearing. Background technique [0002] There are many kinds of polymer materials widely used in the field of sliding friction, such as rubber, nylon, polyurethane, polytetrafluoroethylene, ultra-high molecular weight polyethylene, polyether ether ketone, polyether sulfone, and phenolic resin, etc. Different types of polymers Bearings have different performance characteristics. It is necessary to select suitable bearings according to different working conditions. However, the above-mentioned polymer material bearings produced in China cannot be compatible with high load capacity, short-term water cut-off operation, sand resistance, easy processing, and low cost. Inferior characteristics lead to high load, sediment resistance, and short-term water cut-off conditions, such as dredgers, sediment water qu...

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Problems solved by technology

In addition, the processing technology is also different. This patent adopts twin-screw extrusion technology, and the inner and outer layers are extruded together. In this application, after the inner layer is completed, the outer layer is poured on the outer surface, and the inner and outer layers are bonded together by adhesive. ;Because of the different materials and different processing techniques, the disadvantages of this patent are the twin-screw extrusion technology used, the mold is expensive, the yield is low, the overall process is complicated, and the energy consumption is high.

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