Fluorinated graphene-modified polytetrafluoroethylene composite material for ultrasonic motor and preparation method thereof

A technology of polytetrafluoroethylene and fluorinated graphene is applied in the fields of fluorinated graphene modified polytetrafluoroethylene composite materials for ultrasonic motors and their preparation, and wear-resistant materials for ultra-drought motors, which can solve the problem of poor creep resistance. , short service life, low wear rate and other problems, to achieve the effect of improving mechanical strength, improving creep resistance, and low surface free energy

Active Publication Date: 2021-02-09
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of high surface free energy, poor creep resistance and short service life of the existing friction materials for ultrasonic motors, and to invent a friction material with low surface energy, good creep resistance and wear resistance. A fluorinated graphene-modified polytetrafluoroethylene composite material with a low rate, and a preparation method thereof is provided

Method used

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  • Fluorinated graphene-modified polytetrafluoroethylene composite material for ultrasonic motor and preparation method thereof
  • Fluorinated graphene-modified polytetrafluoroethylene composite material for ultrasonic motor and preparation method thereof
  • Fluorinated graphene-modified polytetrafluoroethylene composite material for ultrasonic motor and preparation method thereof

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Embodiment 1

[0027] A fluorinated graphene-modified polytetrafluoroethylene composite material for an ultrasonic motor, the parts by weight of each component are as follows: 100 g of polytetrafluoroethylene, 1 g of fluorinated graphene, 1 g of multi-walled carbon nanotubes, and 1 g of aluminum silicate .

[0028] Concrete preparation steps:

[0029] 1) Add polytetrafluoroethylene, fluorinated graphene, multi-walled carbon nanotubes, and aluminum silicate powder into alcohol for ball milling for 4 hours, and then dry them in a vacuum oven overnight (at least 12 hours). Crush, and then pass through a 200-mesh sieve; the amount of alcohol should not exceed the surface of the added raw materials during ball milling (the same below);

[0030] 2) Add the mold material mixed in step 1 into the mold for cold pressing, molding at 10MPa, and hold the pressure for 10 minutes; after demoulding, sinter in a PTFE sintering furnace at a temperature of 360°C, keep warm for 2 hours, and then cool with the...

Embodiment 2

[0034] A fluorinated graphene-modified polytetrafluoroethylene composite material for an ultrasonic motor, the parts by weight of each component are as follows: polytetrafluoroethylene 100g, fluorinated graphene 2g, multi-walled carbon nanotubes 2g, aluminum silicate 2g .

[0035] Concrete preparation steps:

[0036] 1) Add polytetrafluoroethylene, fluorinated graphene, multi-walled carbon nanotubes, and aluminum silicate powder into alcohol for ball milling for 5 hours, then dry overnight (at least 12 hours) in a vacuum oven, and then use a high-speed pulverizer for grinding Pulverized, then passed through a 200-mesh sieve;

[0037] 2) Add the mold material mixed in step 1 into the mold for cold pressing, molding at 10MPa, and hold the pressure for 10 minutes; after demoulding, sinter in a PTFE sintering furnace at a temperature of 365°C, keep warm for 2 hours, and then cool with the furnace;

[0038] 3) Slice the polytetrafluoroethylene composite material made in step 2 to...

Embodiment 3

[0041] A fluorinated graphene modified polytetrafluoroethylene composite material for an ultrasonic motor, the parts by weight of each component are as follows: polytetrafluoroethylene 100g, fluorinated graphene 3g, multi-walled carbon nanotubes 3g, aluminum silicate 3g .

[0042] Concrete preparation steps:

[0043] 1) Add polytetrafluoroethylene, fluorinated graphene, multi-walled carbon nanotubes, and aluminum silicate powder into alcohol for ball milling for 6 hours, then dry overnight (at least 12 hours) in a vacuum oven, and use a high-speed pulverizer to grind Pulverized, then passed through a 200-mesh sieve;

[0044] 2) Add the mold material mixed in step 1 into the mold for cold press molding, molding at 15MPa, and hold the pressure for 15 minutes; after demolding, sinter in a PTFE sintering furnace at a temperature of 370°C, keep warm for 2 hours, and then cool with the furnace;

[0045] 3) Slice the polytetrafluoroethylene composite material made in step 2 to a th...

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Abstract

The invention provides a fluorinated graphene modified polytetrafluoroethylene composite material for an ultrasonic motor, and a preparation method of the fluorinated graphene modified polytetrafluoroethylene composite material. The fluorinated graphene modified polytetrafluoroethylene composite material is characterized by being prepared from the following raw materials in parts by weight: 100 parts of polytetrafluoroethylene, 1-5 parts of fluorinated graphene, 1-5 parts of multiwalled carbon nanotubes, and 1-5 parts of aluminium silicate. The preparation method of the fluorinated graphene modified polytetrafluoroethylene composite material comprises the steps that composite powder is subjected to ball milling, evenly mixed, and then added into a die for cold press molding, the die pressure is 10-20 MPa, the pressure is maintained for 10-20 minutes, then die releasing is conducted, sintering is conducted in a tetrafluorohydrazine sintering furnace, and the temperature is 360-380 DEG C. The fluorinated graphene modified polytetrafluoroethylene composite material has the low surface energy, high mechanical strength, stable friction coefficient and ultra-low abrasion rate, starting failure and adhesive abrasion caused by the fact that the friction interface of the ultrasonic motor is stored with pressure for a long time can be lowered, the storing stability of the ultrasonic motor is greatly improved, and the service life of the ultrasonic motor is greatly prolonged.

Description

technical field [0001] The invention belongs to the field of polymer composite materials, in particular to a wear-resistant material technology for ultra-dry motors, specifically a fluorinated graphene-modified polytetrafluoroethylene composite material for ultrasonic motors and a preparation method thereof. Background technique [0002] With the continuous development of ultrasonic motor technology and the rapid expansion of application fields, the requirements for the starting reliability, operation stability and service life of ultrasonic motors are getting higher and higher. Traditional friction materials are difficult to meet the high-performance development of ultrasonic motors. need. Therefore, for special needs and applications, the development of new friction materials has become an effective way to improve the performance of ultrasonic motors. [0003] PTFE is a polymer material with low surface energy, corrosion resistance, and excellent self-lubricating properti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L27/18C08K3/04C08K3/34
Inventor 赵盖宋敬伏丁庆军裘进浩
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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