Porous polyimide oil storage and retention structure and preparation method and application thereof

A technology of polyimide and oil storage layer, which is applied in the field of porous polyimide oil storage and oil retention structure and its preparation, and can solve the problems that cannot meet the service life requirements of high-speed and high-precision bearings

Pending Publication Date: 2021-07-23
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing porous polyimide materials cannot have suitable porosity and oil retention rate a

Method used

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  • Porous polyimide oil storage and retention structure and preparation method and application thereof
  • Porous polyimide oil storage and retention structure and preparation method and application thereof
  • Porous polyimide oil storage and retention structure and preparation method and application thereof

Examples

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preparation example Construction

[0035] In the present invention, the homo-phenylene polyimide is preferably self-made, and the preparation method of the homo-phenylene polyimide preferably includes the following steps: in a protective atmosphere, the aromatic diamine 4,4' -Diaminodiphenylmethyl ether, pyromellitic anhydride and amide solvents are mixed and reacted to obtain an intermediate homogeneous solution; the intermediate homogeneous solution is mixed with a dehydrating agent for imidization reaction to obtain Benzene polyimide.

[0036] In the present invention, in a protective atmosphere, 4,4'-diaminodiphenylmethyl ether, pyromellitic anhydride and amide solvents are mixed and then reacted to obtain an intermediate homogeneous solution. In the present invention, the protective atmosphere is not particularly limited, and a protective atmosphere well known to those skilled in the art can be used, such as nitrogen or argon. In the present invention, the molar ratio of 4,4'-diaminodiphenylmethyl ether (...

Embodiment 1

[0062] (1) Under nitrogen protection atmosphere, room temperature, normal pressure, and stirring conditions, dissolve the aromatic diamine 4,4'diaminodiphenylmethanol (ODA) in an amide solvent, and then add an equal amount of the same substance Pyrylenetetracarboxylic anhydride (PMDA), and add solvent so that the total mass concentration of ODA and PMDA is 15wt%, stir and react at room temperature for 16h, obtain intermediate homogeneous solution; then add dehydrating agent toluene and mix uniformly in intermediate homogeneous solution , the temperature was raised to 155°C for imidization reaction, after the reaction was completed, the reaction system was poured into water to precipitate isophthalic polyimide, filtered, the obtained solid product was washed with ethanol, and vacuum-dried at 150°C to obtain homogeneous polyimide Benzene polyimide; wherein, the mass ratio of the intermediate homogeneous solution and toluene is 5:1.

[0063] (2) Sieve and classify the monoether p...

Embodiment 2

[0067] Prepare porous polyimide oil storage and oil retention structure according to the method of embodiment 1, and the difference with embodiment 1 is:

[0068] In step (2), the particle size of the monoether polyimide is 40-70 μm; the pressing pressure of the first cold isostatic press is 90 MPa;

[0069] In step (3), the pressure that the second cold isostatic press presses is 120MPa;

[0070] In step (4), the composite sintering temperature is 350° C., the pressure is 10 MPa, and the time is 30 minutes.

[0071] The pore size distribution diagram of the porous polyimide oil storage and oil retention structure prepared in this example is as follows figure 2 shown by figure 2 It can be seen that the pore size of the oil control layer of the porous polyimide oil storage and retention structure is mainly distributed in the range of 0.3-0.5 μm, the pore size of the oil reservoir is mainly distributed in the range of 1-2.25 μm, and the pore volume of the oil storage layer i...

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Abstract

The invention provides a porous polyimide oil storage and retention structure and a preparation method and application thereof, and relates to the technical field of polyimide materials. The porous polyimide oil storage and retention structure comprises an oil storage layer and an oil control layer; the oil storage layer is made of monoether type polyimide, the porosity of the monoether type polyimide is 18-26%, and the aperture of the monoether type polyimide is 1.0-3.0 [mu] m; the oil control layer is made of pyromellitic polyimide, the porosity of the pyromellitic polyimide is 12-18%, and the pore diameter of the pyromellitic polyimide is 0.6-1.0 [mu] m. The pyromellitic polyimide is low in porosity and small in aperture so that the oil release rate of the composite material can be slowed down, and the oil retention rate can be increased; the monoether polyimide is high in porosity and large in aperture, so that the porosity and the oil storage rate of the composite material can be improved; the composite material provided by the invention has high oil storage rate and oil retention rate and good strength and wear resistance, and can meet the requirement of a high-speed and high-precision bearing on the service life.

Description

technical field [0001] The invention relates to the technical field of polyimide materials, in particular to a porous polyimide oil storage structure and its preparation method and application. Background technique [0002] Porous polyimide material has the characteristics of high oil content and good mechanical strength. As a bearing cage material, it is widely used in high-speed and high-precision bearings for aerospace, high-end machine tools, and high-end automobiles. When the bearing rotates, the porous polyimide bearing cage releases the lubricating oil to the surface of the cage and the rolling elements; when the bearing is stationary, the lubricating oil is sucked back into the porous polyimide cage for storage due to hair suction, reducing lubrication The oil volatilizes, and this oil release-oil storage cycle endows the porous polyimide cage with long life and maintenance-free characteristics. With the progress of industrial development, higher oil content and lif...

Claims

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Application Information

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IPC IPC(8): B32B1/08B32B7/10B32B27/08B32B27/28B32B37/06F16C33/38F16C33/46
CPCB32B1/08B32B27/281B32B27/08B32B7/10B32B37/06F16C33/46F16C33/38B32B2307/50B32B2307/554B32B2597/00
Inventor 杨丽君陶立明王超王廷梅王齐华
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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