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A method for improving the heat resistance of ether anhydride type polyimide cage blank

A polyimide and cage technology, applied in the field of engineering plastic cages, can solve problems such as failure, thermal decomposition of deformation, limited improvement of heat resistance, etc., and achieve the effect of light weight and high temperature tensile strength

Active Publication Date: 2017-01-11
LUOYANG BEARING RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Generally, the glass transition temperature of ether anhydride polyimide does not exceed 265°C, the heat distortion temperature (1.80MPa) is less than 245°C, the high temperature tensile strength retention rate is low, and the thermal conductivity is less than 0.2W.(m.K) -1 , due to the large amount of frictional heat generated during high-speed rotation that cannot be quickly transmitted, the surface of the cage is softened, deformed or even thermally decomposed, which seriously affects the reliability and life of the bearing. Therefore, the heat resistance of ether anhydride polyimide is insufficient Become a premise that limits its application in the field of high temperature and high speed bearing cages
[0004] The most fundamental way to improve the heat resistance of ether anhydride polyimide is to synthesize a new structural polyimide with higher heat resistance and excellent processing performance, but this method is limited by the source of raw materials, synthesis technology, development cycle and production cost. Restricted by many factors such as polyimide, it is too difficult; therefore, the research on improving the heat resistance of polyimide is more focused on preparing a heterogeneous polymer system with higher heat resistance by blending or filling methods. Therefore, domestic and foreign Scholars use aramid fibers, copper powder, glass fibers, carbon fibers, potassium titanate whiskers, and nanomaterials to blend and modify them in order to improve the heat resistance of ether anhydride polyimides. However, this The improvement of the heat resistance of the ether anhydride composite material produced by the modification method is at the expense of its tensile strength. Therefore, the improvement of the heat resistance is limited, and it is difficult to meet the heat resistance requirements of high-temperature and high-speed bearings for the cage material. need
[0005] The glass transition temperature of the isophthalic polyimide molding powder is greater than 380°C, and its structure is relatively close to that of ether anhydride polyimide. The bonding force is good, the tensile strength retention rate is high, and the heat resistance can be significantly improved; at the same time, the addition of thermally conductive lubricating materials can improve the thermal conductivity of ether anhydride polyimide and improve its tribological properties. At present, domestic There is no report on the method of modifying the ether anhydride type polyimide cage blank by the molding powder of the phenylene type polyimide and the heat conduction lubricant material

Method used

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  • A method for improving the heat resistance of ether anhydride type polyimide cage blank
  • A method for improving the heat resistance of ether anhydride type polyimide cage blank
  • A method for improving the heat resistance of ether anhydride type polyimide cage blank

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Effect test

Embodiment 1

[0040] (1) Preparation of cage tube blank material:

[0041] The ratio by weight percentage is: 75% ether anhydride polyimide molding powder, 20% isophthalic polyimide and 5% carbon fiber powder;

[0042] (2) Drying treatment:

[0043] Put the cage tube blank materials obtained in the previous step into a drying oven for drying treatment; the temperature of the drying treatment is 230°C, and the drying time is 3 hours. After drying, take it out and cool it to room temperature, then pass through a 200-mesh sieve and Independently sealed for future use;

[0044] (3) Proportioning process:

[0045] Take the dry 75% ether anhydride type polyimide molding powder obtained in the previous step by weight percentage, 20% homophenylene polyimide molding powder and 5% carbon fiber powder, and put them into a mechanical mixer Stir 3 times, the time of each stirring is controlled at 20 seconds, the rotating speed of the mechanical stirrer is controlled at 10000 rpm during each stirring,...

Embodiment 2

[0056] (1) Preparation of cage tube blank material:

[0057] The ratio by weight percentage is: 70% ether anhydride polyimide molding powder, 25% isophthalic polyimide and 5% graphite;

[0058] (2) Drying treatment:

[0059] Put the cage tube blank materials obtained in the previous step into a drying oven for drying treatment; the temperature of the drying treatment is 230°C, and the drying time is 3 hours. After drying, take it out and cool it to room temperature, then pass through a 200-mesh sieve and Independently sealed for future use;

[0060] (3) Proportioning process:

[0061] Take the dry 70% ether anhydride polyimide molding powder obtained in the previous step by weight percentage, 25% isophthalic polyimide molding powder and 5% graphite, and put them into a mechanical mixer for stirring 3 times, the time of each stirring is controlled at 20 seconds, and the rotating speed of the mechanical mixer is controlled at 10,000 rpm during each stirring, and the ether anh...

Embodiment 3

[0071] (1) Preparation of cage tube blank material:

[0072] The ratio by weight percentage is: 69% ether anhydride polyimide molding powder, 30% isophthalic polyimide and 1% carbon nanotubes;

[0073] (2) Drying treatment:

[0074] Put the cage tube blank materials obtained in the previous step into a drying oven for drying treatment; the temperature of the drying treatment is 230°C, and the drying time is 3 hours. After drying, take it out and cool it to room temperature, then pass through a 200-mesh sieve and Independently sealed for future use;

[0075] (3) Proportioning process:

[0076] Take the dry 69% ether anhydride polyimide molding powder and 1% carbon nanotubes of 30% polyimide molding powder obtained in the previous step and put them into a mechanical mixer Stir within 5 times, the time of each stirring is controlled at 30 seconds, and the rotating speed of the mechanical mixer is controlled at 12000 rpm during each stirring, and the ether anhydride type polyim...

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Abstract

The invention discloses a method used for increasing hear resistance of ketone-anhydride type polyimide retainer tube blank, and belongs to the field of engineering plastic retainer technology. The method comprises steps of preparation of a retainer tube blank material, drying, mixing, hot press molding, and annealing treatment. According to the method, the retainer tube blank material is subjected to drying and mixing, and then is subjected to hot press molding using a programmed type thermocompressor so as to obtain ketone-anhydride type polyimide composite retainer tube blank; and then the obtained ketone-anhydride type polyimide composite retainer tube blank is subjected to annealing treatment. The obtained ketone-anhydride type polyimide composite retainer tube blank is light, and high temperature tensile strength, tribological properties, and heat resistance are improved effectively.

Description

technical field [0001] The invention relates to the technical field of engineering plastic cages, in particular to a method for improving the heat resistance of an ether anhydride type polyimide cage blank. Background technique [0002] It is well known that ether anhydride polyimide has the advantages of high tensile strength, small friction coefficient, wear resistance, etc., especially its good molding processability, and is widely used in the field of medium and low speed ball bearing cages. Polyimide Compared with traditional metal alloy cages, composite material cages have significant material advantages in improving the speed and operation stability of bearings, and are one of the important research directions in the field of high-temperature and high-speed bearings. [0003] Generally, the glass transition temperature of ether anhydride polyimide does not exceed 265°C, the heat distortion temperature (1.80MPa) is less than 245°C, the high temperature tensile strength...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L79/08C08K7/06C08K7/00C08K3/04C08J7/00B29C71/02
CPCB29C71/02B29C2071/022C08K2201/003C08L79/08C08L2201/08C08L2203/30C08L2205/025C08K7/06C08K3/04C08K7/24
Inventor 孙小波王子君张素娥王枫贾会粉
Owner LUOYANG BEARING RES INST CO LTD
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