Polyurethane for bearing and preparation method thereof

Abstract

The invention relates to the field of high polymer materials, and particularly discloses polyurethane for a bearing and a preparation method of the polyurethane. The invention discloses polyurethane for a bearing. The polyurethane is prepared from the following raw materials in parts by weight: 50-75 parts of polymer polyol, 20-40 parts of diisocyanate, 4-8 parts of a chain extender, 2-5 parts of a cross-linking agent, 1-3 parts of loading mesoporous silica and 0.5-1.5 parts of filler fibers, the preparation method comprises the following steps: S1, weighing the loading material mesoporous silica and the filler fiber, and uniformly mixing and stirring to prepare a primary mixture; s2, weighing polymer polyol and diisocyanate, mixing the polymer polyol and the diisocyanate, and carrying out a reaction at 70-85 DEG C for 2-3.5 h to prepare a prepolymer; s3, weighing a prepolymer, a chain extender, a cross-linking agent and the primary mixture, uniformly mixing and stirring, and reacting at 100-120 DEG C for 12-15 hours to obtain a finished product polyurethane; the polyurethane on the bearing is not prone to permanent deformation after being subjected to high load force, and the service life of the polyurethane on the bearing is prolonged.

Description

technical field [0001] The present application relates to the field of polymer materials, and more particularly, to a polyurethane for bearings and a preparation method thereof. Background technique [0002] Polyurethane is a polymer compound with good stability, chemical resistance, resilience and mechanical properties. [0003] Bearing is a component that supports the mechanical rotating body, reduces the friction coefficient during the movement of the mechanical rotating body, and ensures the rotation accuracy; while the bearing is often easy to withstand high load forces during use, in order to make the bearing have better buffer, reduce Vibration effect, polyurethane is applied to the bearing. [0004] However, when the bearing is applied to the vehicle, it is easily affected by the high-load extrusion force. When the high load is removed, the polyurethane is prone to permanent deformation, thereby affecting the service life of the polyurethane on the bearing. [0005...

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Problems solved by technology

[0004] However, when the bearing is applied to a vehicle, it is easily affected by the high-load extrusion force. When the high load is removed, the polyurethane is prone to permanent deformation, which affects the service life of the polyurethane on the bearing.

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