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

A composite material and polyoxymethylene technology, which is applied in the field of modified polyoxymethylene self-lubricating composite material and its preparation, can solve the problems of narrow processing and molding temperature, difficulty, mechanical properties decline, etc., and achieves good mechanical properties, high production efficiency, and manufacturing low cost effect

Inactive Publication Date: 2007-06-13
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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

Examples

Experimental program
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Effect test

Example Embodiment

[0030]Example 1: Prepared materials, the specific proportions are shown in Example 1. The materials in the above proportions are mixed at high speed and added at one time from the main feeder. The temperature of the barrel of the twin-screw extruder is 170-190°C, and the granulation is carried out under the condition of 80rpm. After the granulated material is dried, it is molded by a screw injection molding machine, and the temperature of the barrel is 185-230 °C, and the sliding parts with smooth surface are injected by injection molding.

Example Embodiment

[0031] Example 2: The prepared materials, the specific proportions are as shown in Example 2. Mix and impregnate the above-mentioned fiber with lubricating oil, mix with POM and additives at high speed, add it from the main feeder, mix the solid lubricant at high speed, add it from the secondary feeder, and the temperature of the twin-screw extruder barrel is 170~ 190 ℃, granulation under the condition of rotating speed 120rpm. Using screw injection molding machine, the barrel temperature is 185-230 ℃, and the sliding parts with smooth surface are injected.

Example Embodiment

[0032] Example 3: The prepared materials, the specific proportions are as shown in Example 3. The POM and processing aids are mixed at high speed and added from the main feeder; the solid lubricant is mixed at high speed and added from the secondary feeder. After the fibers and lubricating oil are fully impregnated, they are added from the glass fiber inlet of the extruder. The temperature of the extruder barrel is 170-190° C. and the rotation speed is 120 rpm. At the exit of the sheet die head, a sheet with a thickness of 1.0 mm is prepared by a calendering and winding device. Through the sintering furnace, the modified polymer material is compounded with the steel plate with the sintered spherical copper powder, which is quickly taken out and rolled to obtain a multi-layer composite material with a surface modification layer thickness of 0.4 mm.

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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...

Claims

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Application Information

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IPC IPC(8): C08L59/04C08K3/06C08J5/04C10M107/32C10N50/08
Inventor 王宏刚简令奇杨生荣
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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