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Method for preparing ultralow friction hexagonal boron nitride fluid lubricant

A hexagonal boron nitride, ultra-low friction technology, applied in lubricating compositions, additives, petroleum industry, etc., can solve the problems of poor self-repairability, poor fluidity, high friction coefficient, etc., and achieve long wear life and complete insulation Friction coefficient, effect of low friction coefficient

Active Publication Date: 2019-02-26
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

[0003] The development of aviation, aerospace, and nuclear industries in the 20th century promoted the research of solid lubrication, and MoS 2 , graphite, polytetrafluoroethylene (PTFE), polymers, and oxides have been widely used as solid lubricants, but solid lubricants generally have a high friction coefficient (0.2~0.5) and poor fluidity. Poor repairability, so it is still limited in high-precision lubrication
[0004] Due to the excellent physical and chemical properties of graphene, it has received extensive attention in tribology in recent years. It has been confirmed that graphene has good anti-friction and anti-wear properties in solid lubrication, but this type of lubricant is not suitable for high temperature Or in more harsh environmental conditions such as easy oxidation, and generally solid lubricants, the fluidity is limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1 A kind of preparation method of ultra-low friction hexagonal boron nitride fluid lubricant, comprises the following steps:

[0025] ⑴ Preparation of Pebax-BNNSs composite material:

[0026] Commercial h-BN powder and Pebax powder were mixed at a mass ratio of 2:13 (g / g), placed in a high-temperature mixer at 350°C for mechanical mixing and shearing for 4-6 hours, and then the mixture was collected. The Pebax-BNNSs composite material is obtained when it is solidified at room temperature;

[0027] (2) Heat the Pebax-BNNSs composite material to 150°C under the condition of an oil bath, and fully dissolve it under the action of magnetic stirring, and then collect the suspension;

[0028] (3) The suspension is centrifuged for 20 minutes under the condition of 1000 rpm, and larger particles and impurities are filtered out to obtain the supernatant, which is subjected to secondary centrifugation for 20 minutes and filtered under the condition of 8000 rpm. get se...

Embodiment 2

[0032] Embodiment 2 A preparation method of an ultra-low friction hexagonal boron nitride fluid lubricant, comprising the following steps:

[0033] ⑴ ~ ⑶ with embodiment 1.

[0034] (4) Dissolve the precipitate in ethanol solution at a mass volume ratio (g / mL) of 1:20, and disperse at room temperature for 4 hours using an ultrasonic disperser to obtain a dispersion, which is heated to 100 °C in an oil bath ℃, and fully dissolved under the action of magnetic stirring, and finally centrifuged at 4000rpm for 20min in a centrifuge, and the collected supernatant was the Pebax-BNNSs ionic liquid lubricant.

[0035] The prepared liquid lubricant has an effect on Si 3 N 4 The results of the ball friction and wear test show that the reciprocating sliding distance is 5mm, the load is 2N~6N, the sliding speed is 4Hz~8Hz, and the steady-state friction coefficient is 0.009~0.05 according to the friction testing machine.

Embodiment 3

[0036] Embodiment 3 A preparation method of an ultra-low friction hexagonal boron nitride fluid lubricant, comprising the following steps:

[0037] ⑴ ~ ⑶ with embodiment 1.

[0038] (4) Dissolve the precipitate in ethanol solution at a mass volume ratio (g / mL) of 1:30, and disperse at room temperature for 4 hours using an ultrasonic disperser to obtain a dispersion, which is heated to 100 °C in an oil bath ℃, and fully dissolved under the action of magnetic stirring, and finally centrifuged in a centrifuge for 20min at a speed of 5000rpm, and the collected supernatant was the Pebax-BNNSs ionic liquid lubricant.

[0039] The prepared liquid lubricant has an effect on Si 3 N 4 The results of the ball friction and wear test show that the reciprocating sliding distance is 5mm, the load is 2N~6N, the sliding speed is 4Hz~8Hz, and the steady-state friction coefficient is 0.01~0.05 according to the record of the friction testing machine.

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Abstract

The invention relates to a method for preparing an ultralow friction hexagonal boron nitride fluid lubricant. The method comprises the following steps: (1) preparing a Pebax-BNNSs composite material,namely mixing commercial h-BN powder with Pebax powder, carrying out mechanical mixing and shearing, collecting a mixed liquid, and cooling the mixed liquid to the room temperature till being cured soas to obtain the Pebax-BNNSs composite material; (2) heating the Pebax-BNNSs composite material under an oil bath condition, sufficiently dissolving under the action of magnetic stirring, and collecting a suspension; (3) carrying out centrifugal separation on the suspension by using a centrifuge so as to obtain supernate, carrying out secondary centrifugal separation on the supernate, and filtering so as to obtain precipitate; (4) dissolving the precipitate into an ethanol solution, dispersing by using an ultrasonic dispersion machine, heating under the oil bath condition, sufficiently dissolving under the action of magnetic stirring, finally carrying out centrifugal separation by using the centrifuge, and collecting supernate, thereby obtaining a Pebax-BNNSs ionic liquid lubricant. The method is simple and feasible, and the obtained liquid lubricant is free of pollution, very low in friction coefficient and very excellent in lubrication and wearing resistance.

Description

technical field [0001] The invention relates to the field of lubricant production, in particular to a preparation method of an ultra-low friction hexagonal boron nitride fluid lubricant. Background technique [0002] Friction and wear are ubiquitous in nature. Due to the loss of energy due to overcoming friction, the efficiency of the machine is reduced, resulting in wear and tear, which reduces the accuracy, life and reliability of the machine. Friction causes the temperature to rise. If the heat dissipation is not good, it will cause thermal expansion of the machine parts. , Destroy the normal operation of the machine, so that the phenomenon of seizure occurs, the overheating of the machine can make the lubricant lose its effect, the working conditions will deteriorate, and the wear of the machine will be accelerated. Therefore, the loss of primary energy in the world is more than 50%, and wear is one of the three main reasons for the scrapping of materials and equipment. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M161/00C10N30/06
CPCC10M161/00C10M2201/061C10N2030/06
Inventor 张俊彦安璐璐白常宁高凯雄于元烈强力
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI