CN109851962A - One type graphene nano carbonitride modified Teflon friction material and its preparation method and application - Google Patents
One type graphene nano carbonitride modified Teflon friction material and its preparation method and application Download PDFInfo
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Abstract
The present invention relates to technical field of composite materials, and in particular to type graphene nano carbonitride modified Teflon friction material and its preparation method and application.Class graphene nano carbonitride modified Teflon friction material provided by the invention according to the mass fraction, including following prepares raw material: 50~80 parts of polytetrafluoroethylene (PTFE)；5~15 parts of polyimides；5~10 parts of polybenzoate；5~20 parts of Fanglun slurry cake；5~15 parts of potassium titanate crystal whisker；0.5~1.3 part of class graphene nano carbonitride.The class graphene nano carbonitride modified Teflon friction material that the present invention is prepared using the raw material of said ratio is on the basis of with coefficient of friction is stablized, also there is lower quality wear rate and higher transfer efficiency, can satisfy the requirement in ultrasound electric machine for friction material.
Description
Technical field
The present invention relates to technical field of composite materials, and in particular to the modified polytetrafluoroethyl-ne of a type graphene nano carbonitride
Alkene friction material and its preparation method and application.
Background technique
Ultrasound electric machine is a kind of 20th century small and special electric machine of novel concept that develops rapidly of the eighties, has weight
Gently, the advantages of low-speed big, fast response time, in addition the characteristics of it is not by electromagnetic interference, in biomedical, precision instrument instrument
The high-tech sectors such as table, the joint drive of robot, micro-machining techniques, aerospace, Mars probes are widely used
Prospect.
Since ultrasound electric machine conveys power by frictional interface, thus the frictional behavior at interface is to ultrasound electric machine overall performance
Performance it is most important, usually require that friction material includes 1. suitable and stable coefficient of friction (0.15~0.3), low speed without
It wriggles, creeping phenomenon；2. preferable antiwear characteristic；3. higher stalling torque, it is desirable that be greater than 0.65Nm；4. stabilization of speed, short
Fluctuation is small in time, and the fluctuation of speed is less than the 10% of no-load speed in 1min, and long time running speed does not decline；5. frictional noise
Low (< 45dB)；6. hardness (shore hardness HD is 60~80) appropriate and elasticity modulus；7. (often, under the conditions of high and low temperature) is stablized
Physics and chemical characteristic, low temperature resistant and high-temperature stability；8. good thermal conductivity, vibration resistance and impact resistance characteristic；9. with rubbing
Wipe lower adhesion strength between pair；10. good machining property.
The advantages that kinematics and static friction coefficient of polytetrafluoroethylene (PTFE) (PTFE) is close, thermochemical property stabilization, easy processing is just full
The requirement of sufficient ultrasound electric machine friction material；But pure PTFE hardness is low, and wear-resisting property is poor, and mechanical strength is low, in external force
Under can generate biggish viscoelastic deformation, easy creep etc., it is necessary to be modified and be just able to satisfy ultrasound electric machine friction material use and want
It asks.The filler of modified Teflon mainly includes carbon fiber, graphene, copper powder etc., is not able to satisfy friction material in ultrasound electric machine
Material need to have the requirement of high-wearing feature and energy conversion efficiency.
Summary of the invention
The purpose of the present invention is to provide a type graphene nano carbonitride modified Teflon friction material and its
Preparation method and application, class graphene nano carbonitride modified Teflon friction material provided by the invention have stabilization
On the basis of coefficient of friction, also there is lower quality wear rate and higher transfer efficiency.
In order to achieve the above-mentioned object of the invention, the present invention the following technical schemes are provided:
The present invention provides a type graphene nano carbonitride modified Teflon friction materials, by mass fraction
Meter, including following prepare raw material:
50~80 parts of polytetrafluoroethylene (PTFE)；
5~15 parts of polyimides；
5~10 parts of polybenzoate；
5~20 parts of Fanglun slurry cake；
5~15 parts of potassium titanate crystal whisker；
0.5~1.3 part of class graphene nano carbonitride.
Preferably, the partial size of the polytetrafluoroethylene (PTFE) is 50~100 μm.
Preferably, the partial size of the polyimides is 25~35 μm.
Preferably, the partial size of the polybenzoate is 35~50 μm.
Preferably, the length of the Fanglun slurry cake is 800~1350 μm, and specific surface area is 8~13m2。
Preferably, the diameter of the potassium titanate crystal whisker is 1~5 μm, and length is 10~60 μm.
Preferably, the partial size of the class graphene nano carbonitride is 150~300nm.
The present invention provides class graphene nano carbonitride modified Teflon friction materials described in above-mentioned technical proposal
Preparation method, comprising the following steps:
By polytetrafluoroethylene (PTFE), polyimides, polybenzoate, Fanglun slurry cake, potassium titanate crystal whisker and class graphene nano carbonitride
It is successively suppressed and is sintered after mixing, obtain class graphene nano carbonitride modified Teflon friction material.
Preferably, the pressure of the compacting is 70~100MPa, and the time is 3~5min；
The temperature of the sintering is 365~375 DEG C, and soaking time is 90~150min.
The present invention provides class graphene nano carbonitride modified Teflon friction materials described in above-mentioned technical proposal
Or the class graphene nano carbonitride modified Teflon friction material that preparation method described in above-mentioned technical proposal is prepared
Application in ultrasound electric machine.
The present invention provides a type graphene nano carbonitride modified Teflon friction materials, by mass fraction
Meter, including following prepare raw material: 50~80 parts of polytetrafluoroethylene (PTFE)；5~15 parts of polyimides；5~10 parts of polybenzoate；Fanglun slurry cake
5~20 parts；5~15 parts of potassium titanate crystal whisker；0.5~1.3 part of class graphene nano carbonitride.Polytetrafluoroethylene (PTFE) has in the present invention
Under high-low temperature resistant, corrosion resistance and wide temperature range the features such as stable friction factor；Polyimides is as organic polymer filler, energy
Enough dimensional stabilitys for effectively increasing polyflon matrix, reducing has more between linear expansion coefficient, with resin matrix
Good bond strength, so that obtaining smaller stress collection neutralizes stronger impact resistance, compound other fillers can be significantly improved
The elasticity modulus of tetrafluoroethene friction material；Polybenzoate can effectively improve the resistance to of composite material as organic polymer filler
Mill property, thermal conductivity and coefficient of friction；Fanglun slurry cake can effectively improve the wearability of composite material as organic polymer filler
And temperature tolerance；Potassium titanate crystal whisker can effectively improve the bearing capacity and wearability of composite material as inorganic filler；Class
Graphene nano carbonitride can effectively improve the stable friction factor of composite material, wear rate and super as inorganic filler
The transfer efficiency of acoustic-electric machine.The class graphene nano carbonitride modified Teflon being prepared using the raw material of said ratio
Friction material also has lower quality wear rate and higher transfer efficiency, energy on the basis of with coefficient of friction is stablized
Enough meet the requirement in ultrasound electric machine for friction material.
Specific embodiment
The present invention provides a type graphene nano carbonitride modified Teflon friction materials, by mass fraction
Meter, including following prepare raw material:
50~80 parts of polytetrafluoroethylene (PTFE)；
5~15 parts of polyimides；
5~10 parts of polybenzoate；
5~20 parts of Fanglun slurry cake；
5~15 parts of potassium titanate crystal whisker；
0.5~1.3 part of class graphene nano carbonitride.
According to the mass fraction, the system of class graphene nano carbonitride modified Teflon friction material provided by the invention
Standby raw material includes 50~80 parts of polytetrafluoroethylene (PTFE), preferably 60~70 parts.In the present invention, the partial size of the polytetrafluoroethylene (PTFE) is excellent
It is selected as 50~100 μm.In the present invention, polytetrafluoroethylene (PTFE) is with coefficient of friction under high-low temperature resistant, corrosion resistance and wide temperature range
The features such as stablizing；Using the polytetrafluoroethylene (PTFE) of above-mentioned partial size as resin matrix, and can be filled out while guaranteeing the strength of materials
Material uniformly mixing, resin matrix and filler interface cohesion are good, and excessive big, the polytetrafluoroethylene (PTFE) that will lead to mixing calorific value of partial size
It is tacky, it is not easy to be uniformly mixed, partial size is too small to will lead to strength of materials decline.
On the basis of the mass fraction of the polytetrafluoroethylene (PTFE), class graphene nano carbonitride provided by the invention is modified poly-
The raw material for preparing of tetrafluoroethene friction material includes 5~15 parts of polyimides, preferably 8~12 parts.In the present invention, described poly-
Imido partial size is preferably 25~35 μm.In the present invention, for the polyimides as organic polymer filler, use is above-mentioned
Additive amount can effectively increase the dimensional stability of polytetrafluoroethylene (PTFE), reduce linear expansion coefficient；The present invention uses above-mentioned partial size
Polyimides as organic polymer filler, good interface cohesion can be formed with polytetrafluoroethylene (PTFE), and partial size crosses conference
Cause internal stress excessive, interface cohesion is poor, easily causes coefficient of friction fluctuation, and partial size is too small to be easy to reunite, and be unfavorable for dispersing.
On the basis of the mass fraction of the polytetrafluoroethylene (PTFE), class graphene nano carbonitride provided by the invention is modified poly-
The raw material for preparing of tetrafluoroethene friction material includes 5~10 parts of polybenzoate, preferably 6~8 parts.In the present invention, the polyphenyl
The partial size of ester is preferably 35~50 μm.The present invention using the polybenzoate of above-mentioned additive amount and partial size as organic polymer filler,
Compound other fillers can effectively improve the wearability, thermal conductivity and coefficient of friction of composite material.
On the basis of the mass fraction of the polytetrafluoroethylene (PTFE), class graphene nano carbonitride provided by the invention is modified poly-
The raw material for preparing of tetrafluoroethene friction material includes 5~20 parts of Fanglun slurry cake, preferably 10~15 parts.In the present invention, described
The length of Fanglun slurry cake is preferably 800~1350 μm；Specific surface area is preferably 8~13m2.The present invention using above-mentioned additive amount and
For the Fanglun slurry cake of size as organic polymer filler, compound other fillers can effectively improve the wearability of composite material and resistance to
Warm nature.
On the basis of the mass fraction of the polytetrafluoroethylene (PTFE), class graphene nano carbonitride provided by the invention is modified poly-
The raw material for preparing of tetrafluoroethene friction material includes 5~15 parts of potassium titanate crystal whisker, preferably 8~12 parts.In the present invention, described
The diameter of potassium titanate crystal whisker is preferably 1~5 μm；Length is preferably 10~60 μm.The present invention is using above-mentioned additive amount and size
Potassium titanate crystal whisker can effectively improve the bearing capacity and wearability of composite material as inorganic filler, compound other fillers.
On the basis of the mass fraction of the polytetrafluoroethylene (PTFE), class graphene nano carbonitride provided by the invention is modified poly-
The raw material for preparing of tetrafluoroethene friction material includes 0.5~1.3 part of class graphene nano carbonitride, preferably 0.7~1.1 part.
In the present invention, the partial size of the class graphene nano carbonitride is preferably 150~300nm.The present invention is for the class graphite
The source of alkene nano silicon nitride carbon does not have special restriction, is prepared according to method well known to those skilled in the art；?
In the present invention, the class graphene nano carbonitride is preferably using dopamine and silane coupling agent (preferably silane using preceding
Coupling agent KH550) it is modified, specific preparation method preferably includes following steps:
By the mixture of urea and melamine (molar ratio of urea and melamine is (1.5~2.5): (0.5~
1.3)) in 500~600 DEG C of 3~5h of heat treatment, cooling grinding obtains a nanometer g-C3N4Powder；
By the nanometer g-C of 0.5~2 mass parts3N4Powder is in dehydrated alcohol (nanometer g-C3N4The use of powder and dehydrated alcohol
Amount ratio is 12~20min of ultrasonic disperse in (0.5~2) g:300mL), and the dopamine of 2~4 mass parts is added, will using buffer
The pH value of gained system is adjusted to 7~9, and first 10~15h of modification is carried out under room temperature, stirring condition, be centrifuged, wash,
It is dry under the conditions of 80~100 DEG C, obtain the modified nanometer g-C of dopamine3N4Powder.
By the modified nanometer g-C of the dopamine of 0.5~2 mass parts3N4Powder mixes (wherein, silane idol with silane coupling agent
The dosage for joining agent is the modified nanometer g-C of dopamine3N4The 0.5~3% of quality), second is carried out in 50~70 DEG C of waters bath with thermostatic control
The pH value of gained system is adjusted to 8~10 using ammonium hydroxide by 5~7h of modification, and centrifugation is washed, under the conditions of 80~100 DEG C
It is dry, obtain silane coupler modified nanometer g-C3N4(i.e. polytetrafluoroethylene (PTFE) friction material prepares raw material class graphene nano
Carbonitride).
In the present invention, through dopamine and it is silane coupler modified after, the class graphene nano carbonitride and matrix have
It is well bonded, it is compound other using the class graphene nano carbonitride of above-mentioned additive amount and partial size as inorganic filler
Filler can effectively improve the stable friction factor of composite material, the transfer efficiency of wear rate and ultrasound electric machine；And partial size mistake
The binding force of conference reduction and matrix, partial size is too small to reunite, and be unfavorable for being uniformly dispersed.
The present invention does not have special restriction for the above-mentioned source for respectively preparing raw material, using meeting above-mentioned partial size or size is wanted
The commercial goods asked.
The present invention provides class graphene nano carbonitride modified Teflon friction materials described in above-mentioned technical proposal
Preparation method, comprising the following steps:
By polytetrafluoroethylene (PTFE), polyimides, polybenzoate, Fanglun slurry cake, potassium titanate crystal whisker and class graphene nano carbonitride
It is successively suppressed and is sintered after mixing, obtain class graphene nano carbonitride modified Teflon friction material.
The present invention is by polytetrafluoroethylene (PTFE), polyimides, polybenzoate, Fanglun slurry cake, potassium titanate crystal whisker and class graphene nano
Carbonitride mixing, obtains mixture.In the present invention, the hybrid mode for respectively preparing raw material is preferably material by wet type mixing, specifically will
It respectively prepares raw material to be uniformly mixed in dehydrated alcohol, then ethyl alcohol is evaporated to gained wet feed under the conditions of 80~100 DEG C.This hair
It is bright to guarantee that each raw material for preparing is sufficiently mixed using material by wet type mixing, be conducive to improve final gained polytetrafluoroethylene (PTFE) friction material
Performance.
After obtaining mixture, the present invention suppresses the mixture, obtains compacting material.In the present invention, the pressure
The pressure of system is preferably 70~100MPa, more preferably 80~90MPa；Time is preferably 3~5min, more preferably 3~4min.
In the present invention, the compacting preferably carries out at room temperature, that is, is not necessarily to additional heating or cooling.The present invention preferably will
The mixture, which is put into mold, to be suppressed, and is demoulded after the completion of compacting, and compacting material is obtained.
After obtaining compacting material, compacting material is sintered by the present invention, and it is modified poly- to obtain class graphene nano carbonitride
Tetrafluoroethene friction material.In the present invention, the temperature of the sintering is preferably 365~375 DEG C, more preferably 368~372
℃；The heating rate for being warming up to sintering required temperature is preferably 30~40 DEG C/h, more preferably 30~35 DEG C/h；Soaking time is excellent
It is selected as 90~150min, more preferably 110~130min.Compacting material is preferably placed in sintering furnace by the present invention, by room
Temperature is at the uniform velocity warming up to sintering required temperature, and heat preservation is sintered；Temperature fall after sintering obtains the nitridation of class graphene nano
Carbon modified Teflon friction material.
The present invention provides class graphene nano carbonitride modified Teflon friction materials described in above-mentioned technical proposal
Or the class graphene nano carbonitride modified Teflon friction material that preparation method described in above-mentioned technical proposal is prepared
Application in ultrasound electric machine.Class graphene nano carbonitride modified Teflon friction material provided by the invention has
On the basis of stablizing coefficient of friction, also there is lower quality wear rate and higher transfer efficiency, be of great value polymerization
Object friction material can satisfy the requirement in ultrasound electric machine for friction material.Concrete mode of the present invention for the application
There is no special restriction, using mode well known to those skilled in the art.
Below in conjunction with the embodiment in the present invention, the technical solution in the present invention is clearly and completely described.It is aobvious
So, described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based on the reality in the present invention
Example is applied, every other embodiment obtained by those of ordinary skill in the art without making creative efforts all belongs to
In the scope of protection of the invention.
Examples 1 to 3 and reference examples 1~2
Prepare class graphene nano carbonitride, comprising the following steps:
(1) mixture of urea and melamine is heat-treated, cooling grinding obtains a nanometer g-C3N4Powder；
(2) by nanometer g-C3N4Dopamine is added in powder ultrasonic disperse in dehydrated alcohol, adjusts gained using buffer
The pH value of system, carries out the first modification under room temperature, stirring condition, and centrifugation, washing, drying obtain what dopamine was modified
Nanometer g-C3N4Powder；
(3) the nanometer g-C that dopamine is modified3N4Powder is mixed with Silane coupling agent KH550, is carried out in water bath with thermostatic control
Second modification, the pH value of gained system is adjusted using ammonium hydroxide, and centrifugation, washing, drying obtain silane coupler modified receive
Rice g-C3N4(i.e. polytetrafluoroethylene (PTFE) friction material prepare raw material class graphene nano carbonitride)；
Wherein, it respectively prepares raw material proportioning in step (1)~(3) to be listed in Table 1 below, operating parameter is listed in Table 2 below.
Each raw material proportioning when class graphene nano carbonitride is prepared in 1 Examples 1 to 3 of table and reference examples 1~2
Operating parameter when preparing class graphene nano carbonitride in 2 Examples 1 to 3 of table and reference examples 1~2
Class graphene nano carbonitride modified Teflon friction material is stated in preparation, comprising the following steps:
By polytetrafluoroethylene (PTFE), polyimides, polybenzoate, Fanglun slurry cake, potassium titanate crystal whisker and class graphene nano carbonitride
It is mixed in dehydrated alcohol, ethyl alcohol is evaporated by gained wet feed under the conditions of 90 DEG C, gained mixture is put into mold and is carried out
Compacting demoulds after the completion of compacting, and gained compacting material is placed in sintering furnace, sintering required temperature is at the uniform velocity warming up to by room temperature, is protected
Temperature is sintered；Temperature fall after sintering obtains class graphene nano carbonitride modified Teflon friction material；Its
In, each raw material proportioning for preparing is listed in Table 3 below, and operating parameter is listed in Table 4 below.
It is prepared in 3 Examples 1 to 3 of table and reference examples 1~2
The proportion of each raw material when class graphene nano carbonitride modified Teflon friction material
It is prepared in 4 Examples 1 to 3 of table and reference examples 1~2
Operating parameter when class graphene nano carbonitride modified Teflon friction material
The class graphene nano carbonitride modified Teflon friction that will be prepared in Examples 1 to 3 and reference examples 1~2
Material is tested for the property, and the results are shown in Table 5.Wherein, test condition are as follows: the modified polytetrafluoroethyl-ne of class graphene nano carbonitride
Alkene friction material and phosphor bronze opposite grinding test loading force 200N, revolving speed 180r/min, runing time 2h；Coefficient of friction, quality mill
Loss rate and energy conversion efficiency are the average value tested three times.
Prepared by 5 Examples 1 to 3 of table and reference examples 1~2
The performance test results of class graphene nano carbonitride modified Teflon friction material
As can be seen from Table 5, when being added without class graphene nano carbonitride or its excessive additional amount, polytetrafluoroethylene (PTFE) friction
The wearability and energy conversion efficiency of material decrease, and the class graphene nano carbonitride of Examples 1 to 3 preparation is modified
The coefficient of friction of polytetrafluoroethylene (PTFE) friction material is proper (usually requiring that between 0.15~0.3), and quality wear rate is low,
High conversion efficiency.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (10)
1. a type graphene nano carbonitride modified Teflon friction material, according to the mass fraction, including following preparation
Raw material:
50~80 parts of polytetrafluoroethylene (PTFE)；
5~15 parts of polyimides；
5~10 parts of polybenzoate；
5~20 parts of Fanglun slurry cake；
5~15 parts of potassium titanate crystal whisker；
0.5~1.3 part of class graphene nano carbonitride.
2. class graphene nano carbonitride modified Teflon friction material according to claim 1, which is characterized in that
The partial size of the polytetrafluoroethylene (PTFE) is 50~100 μm.
3. class graphene nano carbonitride modified Teflon friction material according to claim 1, which is characterized in that
The partial size of the polyimides is 25~35 μm.
4. class graphene nano carbonitride modified Teflon friction material according to claim 1, which is characterized in that
The partial size of the polybenzoate is 35~50 μm.
5. class graphene nano carbonitride modified Teflon friction material according to claim 1, which is characterized in that
The length of the Fanglun slurry cake is 800~1350 μm, and specific surface area is 8~13m2。
6. class graphene nano carbonitride modified Teflon friction material according to claim 1, which is characterized in that
The diameter of the potassium titanate crystal whisker is 1~5 μm, and length is 10~60 μm.
7. class graphene nano carbonitride modified Teflon friction material according to claim 1, which is characterized in that
The partial size of the class graphene nano carbonitride is 150~300nm.
8. the preparation side of any one of the claim 1~7 class graphene nano carbonitride modified Teflon friction material
Method, comprising the following steps:
Polytetrafluoroethylene (PTFE), polyimides, polybenzoate, Fanglun slurry cake, potassium titanate crystal whisker and class graphene nano carbonitride are mixed
It is successively suppressed and is sintered afterwards, obtain class graphene nano carbonitride modified Teflon friction material.
9. preparation method according to claim 8, which is characterized in that the pressure of the compacting is 70~100MPa, time
For 3~5min；
The temperature of the sintering is 365~375 DEG C, and soaking time is 90~150min.
10. any one of the claim 1~7 class graphene nano carbonitride modified Teflon friction material or right are wanted
The class graphene nano carbonitride modified Teflon friction material for asking 8 or 9 preparation methods to be prepared is in ultrasonic electric
Application in machine.
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| CN113248852B (en) * | 2021-07-15 | 2021-09-21 | 北京石墨烯技术研究院有限公司 | Modified polytetrafluoroethylene composite material, preparation method thereof and sealing element |
| CN114084875A (en) * | 2021-11-23 | 2022-02-25 | 吉林大学 | Inorganic-inorganic core-shell particle, preparation method and application thereof, and high-performance polymer-based composite material |
| CN114084875B (en) * | 2021-11-23 | 2023-01-24 | 吉林大学 | Inorganic-inorganic core-shell particle, preparation method and application thereof, and high-performance polymer-based composite material |
| CN114316486A (en) * | 2022-03-04 | 2022-04-12 | 江门市格雷亚特流体密封技术有限公司 | Polytetrafluoroethylene lip piece material for sealing element and processing technology thereof |
| CN114736448A (en) * | 2022-05-11 | 2022-07-12 | 中国科学院兰州化学物理研究所 | Tungsten disulfide-graphite phase carbon nitride modified ultra-high molecular weight polyethylene composite material and preparation method and application thereof |
| CN114854230A (en) * | 2022-05-27 | 2022-08-05 | 中国科学院兰州化学物理研究所 | Nano silicon dioxide loaded graphite-like phase carbon nitride and preparation method thereof, and self-lubricating phenolic aldehyde laminated cloth bearing material and preparation method thereof |
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