Polytetrafluoroethylene composite friction material and preparation method thereof

A composite friction material and polytetrafluoroethylene technology, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of mechanical properties, mechanical properties, poor pressure bearing and wear resistance, complex preparation process of composite friction materials, and production costs. Advanced problems, to achieve the effect of improving mechanical performance and bearing capacity, strong promotion and application value, and convenient control

Inactive Publication Date: 2013-02-27
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The invention provides a hexagonal boron nitride filled polytetrafluoroethylene / polyphenyl ester composite friction material and its preparation method, aiming to solve the problems of the existing composite friction materials composed of polytetrafluoroethylene, mechanical properties, mechanical properties, The pressure bearing and wear resistance are poor, the friction coefficient is high, and the preparation process of the composite friction material is complicated, and the production cost is high.

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  • Polytetrafluoroethylene composite friction material and preparation method thereof

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preparation example Construction

[0031] The preparation method comprises the following steps:

[0032] In step S101, a certain quality of polytetrafluoroethylene is soaked in absolute ethanol, and a certain quality of polyphenylparaben and hexagonal boron nitride is added, and an appropriate amount of silane coupling agent is added dropwise, and the mixture is evenly stirred in advance;

[0033] In step S102, the mixed liquid obtained in step S101 is ultrasonically oscillated, and at the same time, it is swirled and stirred for 30 minutes until it is completely mixed;

[0034] In step S103, heat and dry the homogeneously mixed material obtained in step S102 at a temperature of 60-80° C. for 24-48 hours;

[0035] In step S104, after the dried material obtained in step S103 is cooled, vacuum hot pressing sintering is performed.

[0036] In the embodiment of the present invention, the specific implementation method of step S101 is: soak a certain quality of polytetrafluoroethylene in a beaker with absolute etha...

Embodiment 1

[0058] Embodiment 1: Get 75% polytetrafluoroethylene soaked in a beaker with absolute ethanol, soak 20% polyphenylparaben and 5% hexagonal boron nitride in this solution, put into ultrasonic cleaning machine Perform ultrasonic oscillation, and use a high-speed mixer to stir for 30 minutes until completely mixed; put the mixed material into a drying oven and heat and dry at 60-80°C for 24-48 hours, fill it into the mold after cooling, and vacuum The hot press sintering furnace is pumped to a vacuum of 1.0×10 -3 Pa; pressurize the mold at 20-30MPa, keep the pressure for 5-15 minutes; slowly release the pressure, first raise the temperature to 160°C at a heating rate of 60°C per hour, then raise the temperature to 327°C at a heating rate of 80°C per hour, and keep it for 1h , then raised to 360-380°C for sintering, and kept for 3-5 hours; stop heating, naturally cool to room temperature, and pressurize 40-60MPa at the same time.

Embodiment 2

[0059] Embodiment 2: Get 70% polytetrafluoroethylene soaked in a beaker with absolute ethanol, soak 20% polyphenylparaben and 10% hexagonal boron nitride in this solution, put into an ultrasonic cleaner Perform ultrasonic oscillation, and use a high-speed mixer to stir for 30 minutes until completely mixed; put the mixed material into a drying oven and heat and dry at 60-80°C for 24-48 hours, fill it into the mold after cooling, and vacuum The hot press sintering furnace is pumped to a vacuum of 1.0×10 -3 Pa; pressurize the mold at 20-30MPa, keep the pressure for 5-15 minutes; slowly release the pressure, first raise the temperature to 160°C at a heating rate of 60°C per hour, then raise the temperature to 327°C at a heating rate of 80°C per hour, and keep it for 1h , then raised to 360-380°C for sintering, and kept for 3-5 hours; stop heating, naturally cool to room temperature, and pressurize 40-60MPa at the same time.

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Abstract

The invention belongs to the technical field of composite material preparation and provides polytetrafluoroethylene composite friction material and a preparation method thereof. The polytetrafluoroethylene composite friction material is compounded by polytetrafluoroethylene (PTFE), poly-p-oxybenzoyl (POB) and hexagonal boron nitride (HBN) respectively at mass ratio of 60%-75%, 20% and 5%-20%. The production process of the composite friction material is simple and is convenient to control and the preparation cost of the composite friction material is low; the mechanical property and the bearing capacity of the polytetrafluoroethylene composite friction material are effectively improved; the friction coefficient of the polytetrafluoroethylene composite friction material is low; and the compression strength, the ball indentation hardness and the wear resistance of the composite material are improved. The polytetrafluoroethylene composite friction material can be applied to engineering and transportation fields which require high bearing capacity and have oil-free lubrication, and has high popularization and application values.

Description

technical field [0001] The invention belongs to the technical field of composite material preparation, and in particular relates to a polytetrafluoroethylene composite friction material and a preparation method thereof. Background technique [0002] Polytetrafluoroethylene (PTFE) has excellent chemical stability, thermal stability, radiation resistance, chemical resistance, excellent self-lubricating properties and extremely low coefficient of friction, and non-stick properties that other materials do not have. However, pure PTFE has disadvantages such as poor machining performance, large thermal expansion coefficient, low hardness, poor mechanical properties, easy "cold flow" under large loads, large viscoelastic deformation and high wear rate, which limits its use under heavy loads. applications under working conditions. [0003] In order to improve the deficiencies in PTFE's mechanical properties and wear resistance, it is modified with filler materials and its molding p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/18C08L67/04C08K3/38C09K3/14B29C67/04
Inventor 王世博潘力滕兵李倩
Owner CHINA UNIV OF MINING & TECH
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