Modified polyacetal self-lubricating composite material, and its preparing method

Abstract

This invention discloses a kind of modified metaformaldehyde self-lubricating composite with good mechanical and self-lubricating properties and its preparation method. The components of the said composite are as follows: metaformaldehyde, organic fiber, solid lubricant, lubricant oil, antioxygen, formaldehyde absorbent and surface lubricant. The said preparation method uses processing technique of melt extrusion by a parallel twin screw extruder. The composite has advantages of homogeneous dispersibility, good mechanical property, ability to maintain good rigidity and malleability of the POM materials, smooth and homogeneous surface, as well as high production efficiency and low manufacturing cost.

Description

technical field [0001] The invention discloses a modified polyoxymethylene self-lubricating composite material with good mechanical properties and self-lubricating properties and a preparation method thereof. Background technique [0002] With the rapid development of machinery, electronics, medical equipment and other fields, various types of sliding parts, such as: bearings, guide rails, skateboards, piston rings, etc., have become more and more widely used. Sliding parts made of self-lubricating polymer-based composites occupy an important place in mechanical components due to their low density, light weight, excellent chemical resistance and good dimensional stability, and low cost. The self-lubricating polymer composite material is a new type of composite material with a small friction coefficient and strong wear resistance, which can reduce the wear of the component itself and the counter surface, and prolong the service life. However, in many harsh environments (such...

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Problems solved by technology

POM material has the following disadvantages: poor thermal stability at high temperature, easy to decompose, narrow processing and molding temperature, poor aging resistance, etc.

The focus of this patent is to select polyoxymethylene with different molecular weights and different structures, so as to obtain composite materials with excellent performance. However, the form of polyoxymethylene products in my country is single, and the performance stability of POM resin needs to be further improved, so good control of the basic resin Molecular structure is very difficult, and it is not easy to form products with good cost performance

[0006] Reported in Chinese patent CN1296034A, UHMWPE, SiO 2 , MgO, CaCO 3 , MgSO 4 , ZrO 2 One or more combinations of inorganic compounds are used as the carrier, silicone oil is used as the liquid lubricant, and the lubricating oil is fully sucked into the carrier by mechanical stirring, and the oil-containing polyoxymethylene composite material is prepared by using a screw extruder. Due to the incompatibility of inorganic compounds and lubricating oil, during the melting process of polyoxymethylene, there will be oil precipitation after heating, resulting in the inability to accurately quantify the content of lubricating oil

[0007] The above inventions and studies have shown that tribological components with good lubricating properties can be produced by dipping a suitable carrier into lubricating oil and extruding through melt extrusion. By adjusting the content of lubricating oil and effectively controlling the viscosity of the liquid lubricant, the material can be used Under the action of friction heat, an oil film of a certain thickness is produced. During the movement, an oil film is formed in the friction interface, which plays a good role in lubrication, but the addition of lubricating oil reduces the mechanical properties of the material.

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