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A kind of polyimide and preparation method thereof, and polyimide sealing ring and preparation method thereof

A polyimide and sealing ring technology, applied in the fields of polyimide and its preparation, polyimide sealing ring and its preparation, can solve the problem of high friction coefficient

Active Publication Date: 2022-06-07
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is still the problem of high friction coefficient when directly using it as a high-performance self-lubricating wear-resistant material, and the wear resistance needs to be further improved.

Method used

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  • A kind of polyimide and preparation method thereof, and polyimide sealing ring and preparation method thereof
  • A kind of polyimide and preparation method thereof, and polyimide sealing ring and preparation method thereof
  • A kind of polyimide and preparation method thereof, and polyimide sealing ring and preparation method thereof

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preparation example Construction

[0033] The invention provides a preparation method of polyimide, comprising the following steps:

[0034] a) the compound of formula (1), graphene oxide and solvent are mixed and reacted to form amino-modified graphene oxide;

[0035] b) mixing and reacting the amino-modified graphene oxide with a dianhydride monomer of formula (2) and a diamine monomer of formula (3) to form a polyamic acid;

[0036] c) carrying out imidization reaction of the polyamic acid to obtain polyimide;

[0037]

[0038] In the present invention, the compound of formula (1) is reacted with graphene oxide to form amino-modified graphene oxide; and then the modified graphene oxide is reacted with dianhydride monomer of formula (2) and diamine monomer of formula (3), Finally, polyimide is obtained. The polyimide prepared by the above method can produce good self-lubrication and wear resistance while maintaining good heat resistance, low thermal expansion coefficient and high toughness.

[0039] Reg...

Embodiment 1

[0075] 1. Preparation of polyimide

[0076] S1. Add 0.3 g of GO to 60 mL of DMAC solvent for ultrasonic treatment for 1 hour to obtain a GO suspension. After that, under a nitrogen atmosphere, the dispersed GO suspension was poured into a reaction device equipped with a magnetic stirrer, 0.255 g of the compound of formula (1) was added, and stirring was continued at 60° C. for 24 hours to obtain an amino-modified graphene oxide solution. .

[0077] S2, adding 16.36 mmol of diamine monomer (3), 16.36 mmol of dianhydride monomer (2), and 60 mL of DMAC solvent to the reaction device of step S1, mixing and stirring after microwave irradiation for 2 min, and reacting at room temperature for 24 h to obtain polyamic acid solution.

[0078] S3. Add 13.57 mmol of acetic anhydride and 13.57 mmol of triethylamine to the polyamic acid solution, and react at 40° C. for 4 h to obtain a polyimide solution. 120 mL of ethanol was used for precipitation, and a yellow precipitate was precipit...

Embodiment 2

[0082] 1. Preparation of polyimide

[0083] S1. Add 0.3 g of GO to 60 mL of DMAC solvent for ultrasonic treatment for 1 hour to obtain a GO suspension. After that, under a nitrogen atmosphere, the dispersed GO suspension was poured into a reaction device equipped with a magnetic stirrer, 0.255 g of the compound of formula (1) was added, and stirring was continued at 60° C. for 24 hours to obtain an amino-modified graphene oxide solution. .

[0084] S2, adding 25.69 mmol of diamine monomer (3), 25.69 mmol of dianhydride monomer (2), and 60 mL of DMAC solvent to the reaction device of step S1, mixing and stirring after microwave irradiation for 2 min, and reacting at room temperature for 24 h to obtain polyamide acid solution.

[0085] S3. Add 15.41 mmol of acetic anhydride and 15.41 mmol of triethylamine to the polyamic acid solution, and react at 40° C. for 4 h to obtain a polyimide solution. 120 mL of ethanol was used for precipitation, and a yellow precipitate was precipi...

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Abstract

The invention provides a polyimide and a preparation method thereof, as well as a polyimide sealing ring and a preparation method thereof. The preparation method of the polyimide of the present invention comprises the following steps: a) mixing and reacting the compound of formula (1), graphene oxide and a solvent to form amino-modified graphene oxide; b) making said amino-modified graphite oxide ene mixed with the dianhydride monomer of formula (2) and the diamine monomer of formula (3) to form polyamic acid; c) the polyamic acid undergoes imidization reaction to obtain polyimide. The present invention adopts the compound of formula (1) to react with graphene oxide to form amino-modified graphene oxide; then react the modified graphene oxide with formula (2) dianhydride monomer and formula (3) diamine monomer, Finally, polyimide is obtained. The polyimide prepared by the above method can produce good self-lubrication and wear resistance while maintaining good heat resistance, low thermal expansion coefficient and high toughness.

Description

technical field [0001] The invention relates to the field of organic materials, in particular to a polyimide and a preparation method thereof, as well as a polyimide sealing ring and a preparation method thereof. Background technique [0002] The sealing ring is an annular seal with a gap. It is placed in the ring groove of the sleeve. The sleeve and the shaft rotate together. On the inner hole wall, it can play a sealing role. The seal ring is the general term for the moving ring and the static ring, and is the most important component of the mechanical seal. The sealing ring largely determines the performance and life of the mechanical seal. [0003] The sealing ring is generally made of metal, such as alloy steel, alloy cast iron, etc. However, the metal sealing ring is obviously worn or even worn out, and it will also cause the wear of the sleeve and the ring groove itself, and it has no self-lubricating properties, so it needs to be assisted by lubricating oil. [0...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G73/10C08K9/04C08K3/04C08L79/08
CPCC08G73/1071C08G73/1039C08G73/1007C08K9/04C08K3/042C08L79/08C08L2203/18C08L2201/08Y02E60/10
Inventor 邓鹏飏魏巍史彦东赵阳潘利江
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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