CN115260539A - Method for mixing graphene/polytetrafluoroethylene nano micro powder - Google Patents

Method for mixing graphene/polytetrafluoroethylene nano micro powder Download PDF

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CN115260539A
CN115260539A CN202211020944.6A CN202211020944A CN115260539A CN 115260539 A CN115260539 A CN 115260539A CN 202211020944 A CN202211020944 A CN 202211020944A CN 115260539 A CN115260539 A CN 115260539A
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mixing
graphene
polytetrafluoroethylene
dispersion resin
dispersing agent
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郭华
郭鸣明
王震声
顾钰良
陈晓峰
贾高鹏
徐国华
夏万峰
王婷婷
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JIANGSU HUAYUE TEXTILE NEW MATERIAL TECHNOLOGY CO LTD
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JIANGSU HUAYUE TEXTILE NEW MATERIAL TECHNOLOGY CO LTD
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/20—Compounding polymers with additives, e.g. colouring
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/20—Compounding polymers with additives, e.g. colouring
    • C08J3/203—Solid polymers with solid and/or liquid additives
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F1/00—General methods for the manufacture of artificial filaments or the like
    • D01F1/02—Addition of substances to the spinning solution or to the melt
    • D01F1/10—Other agents for modifying properties
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
    • D01F6/44—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds as major constituent with other polymers or low-molecular-weight compounds
    • D01F6/48—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds as major constituent with other polymers or low-molecular-weight compounds of polymers of halogenated hydrocarbons
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2327/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers
    • C08J2327/02—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment
    • C08J2327/12—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
    • C08J2327/18—Homopolymers or copolymers of tetrafluoroethylene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/02—Elements
    • C08K3/04—Carbon
    • C08K3/042—Graphene or derivatives, e.g. graphene oxides
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/56—Organo-metallic compounds, i.e. organic compounds containing a metal-to-carbon bond
    • C08K5/57—Organo-tin compounds
    • C08K5/58—Organo-tin compounds containing sulfur

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  • Engineering & Computer Science (AREA)
  • General Chemical & Material Sciences (AREA)
  • Textile Engineering (AREA)
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  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Processes Of Treating Macromolecular Substances (AREA)

Abstract

The invention provides a method for mixing graphene/polytetrafluoroethylene nano micro powder, which comprises primary mixing or secondary mixing. The method can avoid the agglomeration phenomenon of the polytetrafluoroethylene dispersion resin, thereby further ensuring the quality of the graphene/polytetrafluoroethylene nano composite split fiber product.

Description

Method for mixing graphene/polytetrafluoroethylene nano micro powder
Technical Field
The invention relates to the field of high-performance fiber materials, in particular to a method for mixing a solid/solid single-phase or solid/liquid two-phase graphene/polytetrafluoroethylene nano high polymer material. In particular to a method for mixing graphene/polytetrafluoroethylene nano micro powder.
Background
Graphene is known as a strategic emerging material in the 21 st century, is called as "black gold", is the hardest and thinnest material known at present, has excellent performances such as very high light transmittance and thermal conductivity, and can bear extremely high current density, and the like, so that the graphene has an important potential application prospect in the fields of aerospace, energy storage, liquid crystal devices, electronic devices, biological materials, sensing materials, catalyst carriers and the like. The polytetrafluoroethylene is called 'plastic king', has the characteristics of very excellent low friction coefficient, high and low temperature resistance, chemical corrosion resistance and the like, and also has the unfavorable characteristics of poor wear resistance, easy creep deformation and the like.
The composite material is a material composed of two or more substances with different physical and chemical properties, the performance of the composite material is not equal to the superposition of the performances of the materials of each component, but far exceeds the performances of the materials of each component, and the materials of each component still keep respective independence.
Graphene and polytetrafluoroethylene used in the high-performance fiber material are nano (nm) and micron (mum) level fine powder or particles, and the existing technology adopts a mechanical mixing method for mixing, so that the powder agglomeration phenomenon is easy to generate, and a uniformly dispersed mixture is difficult to realize, thereby influencing the mixing quality of the composite material.
Disclosure of Invention
The invention aims to provide a method for mixing graphene/polytetrafluoroethylene nano micro powder in the preparation process of graphene/polytetrafluoroethylene nano composite split fibers, and the method can realize uniform dispersion of all components of a mixture.
The purpose of the invention is realized by the following steps:
a method for mixing graphene/polytetrafluoroethylene nanometer micropowder comprises primary mixing or secondary mixing;
the primary mixing method comprises the following steps:
uniformly stirring and mixing the graphene derivative and the diffusant at the rpm of 30-50 and the temperature of below 19 ℃, and then stirring and mixing the graphene derivative and the diffusant with polytetrafluoroethylene dispersion resin at the rpm of 30-50 and the temperature of below 19 ℃; the mass ratio of the graphene derivative to the dispersing agent to the polytetrafluoroethylene dispersion resin is 0.5-1:1.0-2.5:50-100 parts of; the mass ratio of the graphene derivative to the dispersing agent to the polytetrafluoroethylene dispersion resin is preferably 0.8-1:1.5-2.0:50-80 parts;
or mixing the lubricant added with the diffusant component into the graphene derivative, uniformly stirring, adding the polytetrafluoroethylene dispersion resin, and stirring and mixing at 30-50 rpm; the mass ratio of the graphene derivative to the dispersing agent to the lubricant to the polytetrafluoroethylene dispersion resin is 0.5-1:1.0-2.5:25-30:65-70;
the secondary mixing method comprises the following steps:
mixing a dispersing agent into the micro powder of the graphene derivative, uniformly stirring, adding polytetrafluoroethylene dispersion resin, and mixing to obtain a prefabricated mixture; and stirring and mixing the prepared mixture and the polytetrafluoroethylene dispersion resin for the second time at the speed of 30-50rpm to obtain a mixture.
The graphene derivative is graphene oxide, reduced graphene oxide, graphene nano-sheets GNPs, fluorine atom-containing functional group graphene oxide or functionalized graphene; the average particle diameter of the graphene derivative is 50-300nm, and the carbon content of the graphene derivative>97% and specific surface area of 30-60m 2 (ii)/g; the graphene derivative can resist the high temperature of more than 360 ℃.
In the primary mixing process, the mass ratio of the graphene derivative to the polytetrafluoroethylene dispersion resin powder is (0.5-1): 100.
the dispersing agent is formed by stirring and mixing a dispersing agent, a stabilizing agent and a nonionic surfactant homogenizer, and the mass ratio is 3-11:3-8:3-11; the mass of the diffusant is 1.0-2.5% of that of the polytetrafluoroethylene dispersion resin. Preferably 1 to 2% by mass of the polytetrafluoroethylene dispersion resin, and more preferably 1.5 to 2% by mass of the polytetrafluoroethylene dispersion resin. The dispersing agent component mixture can fully disperse the graphene derivative and the polytetrafluoroethylene dispersion resin powder, and prevent agglomeration. The components of the dispersing agent, the stabilizing agent, the nonionic surfactant and the like which form the dispersing agent are preferably micron (mum) level fine powder and can form uniformly dispersed mixed powder.
In the primary mixing process or the secondary mixing process, low-speed stirring is adopted, so that the self-aggregation phenomenon of the polytetrafluoroethylene particles during high-speed stirring can be avoided. Mixing a dispersing agent into the graphene derivative or the polytetrafluoroethylene dispersion resin can prevent the mutual agglomeration of the fine powders of the graphene derivative and the polytetrafluoroethylene dispersion resin and shorten the stirring time.
The polytetrafluoroethylene dispersion resin is prepared by taking polytetrafluoroethylene resin powder with the crystallinity of more than 98 percent and the average grain diameter of 200-300 mu m, and sieving the polytetrafluoroethylene resin powder by adopting a sieve with 8-20 meshes under the environmental condition of lower than 19 ℃ to remove agglomerated particles.
The lubricant can be selected from paraffin oil, petroleum ether, white kerosene and aviation kerosene; aviation kerosene is preferred.
Compared with the prior art, the invention has the beneficial effects that:
1 adopt the low-speed stirring of graphite alkene derivative and polytetrafluoroethylene dispersion resin secondary mixing, mix the high-speed stirring once more, make two kinds of polymer material dispersions more abundant, mix more evenly, the emergence of polytetrafluoroethylene dispersion resin reunion phenomenon can further be avoided in the secondary stirring of lower speed to guarantee product quality.
2) The novel process of adding the graphene derivative micro powder into the lubricant is adopted, so that the problem of agglomeration of the graphene and polytetrafluoroethylene powder can be thoroughly solved. And a multi-component dispersing agent is added into the lubricant in advance, so that the graphene derivative is uniformly dispersed, the stirring time is shortened, and the efficiency is improved.
3) The multiple mixing methods provided by the invention can effectively improve the technical problems that agglomeration is easy to generate and the product quality is influenced when nano and micron-sized micro-particle polymer materials are mixed, and are also suitable for preparing graphene/polytetrafluoroethylene nano composite materials for other purposes.
Drawings
FIG. 1 is an electron microscope image of the dispersion state of graphene in polytetrafluoroethylene in the fiber of example 1
FIG. 2 is an electron microscope image of the dispersion state of graphene in polytetrafluoroethylene in the fiber of comparative example 1
FIG. 3 is an electron micrograph of the dispersion state of graphene in polytetrafluoroethylene in the fiber of comparative example 2
Detailed Description
The present invention will be described in further detail with reference to examples. It is to be understood that the disclosed embodiments are merely exemplary of the invention, and are not intended to be exhaustive or exhaustive. Based on the embodiments of the present invention, other embodiments obtained by a person of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
The reduced graphene oxide micro powder is produced by Shanghai microsystems and information technology research institute of Chinese academy of sciences;
polytetrafluoroethylene dispersion resin powder was produced from kao cheng light in Sichuan;
the mixer is manufactured by salt city, yunli Mill mechanical manufacturing, inc.;
aviation kerosene is manufactured by Shenyang Wanfu lubricating oil Co., ltd;
amphiphilic graphene oxide micropowder was purchased from southwest university;
the graphene derivative micro powder with the fluorine atom functional group is produced by Shanghai microsystems and information technology research institute of Chinese academy of sciences;
DF-204 Polytetrafluoroethylene Dispersion resin (degree of crystallinity 98%, average particle diameter 200 to 300 μm) was produced by Polymer materials Ltd in east Shandong.
Example 1
Taking a PD-85 dispersing agent, an octyl tin mercaptide stabilizing agent and an MPEG750 nonionic surfactant, and mixing the components in a proportion of 7:6: mixing at a weight ratio of 7, stirring for 30min at a rotating speed of 1500rpm by a homogenizer to obtain a diffusant component micro powder mixture, stirring and mixing 200g of diffusant and 100g of reduced graphene oxide micro powder at a low speed of 50rpm and below 19 ℃ to obtain mixed powder, slowly pouring the mixed powder into sieved DF-204 polytetrafluoroethylene dispersion resin powder at a low speed of 50rpm and below 19 ℃ for 1h by a stirrer to obtain the mixed powder. And preparing the graphene/polytetrafluoroethylene nano composite split fiber from the mixed powder by adopting an extrusion spinning method. The electron micrograph is shown in figure 1, and the dispersion is uniform.
Example 2
Selecting 200g of amphiphilic graphene oxide micro powder and 50rpm of components of a dispersing agent (comprising 110g, 80g and 110g of PD-85 dispersing agent, octyl tin mercaptide stabilizing agent and MPEG750 nonionic active agent respectively, stirring and mixing by using a homogenizer at the rotating speed of 1500 rpm) at the temperature of below 19 ℃, stirring for 30min, adding 15Kg of polytetrafluoroethylene dispersion resin into the mixture, mixing and stirring to obtain a prefabricated mixture, and stirring at the rotating speed of 50rpm for 30min. Mixing the prepared mixture with 20Kg of polytetrafluoroethylene dispersion resin, stirring and mixing with a stirrer with the rotating speed of 50rpm under the condition of the temperature of below 19 ℃, and stirring for 30min to obtain mixed powder. The split fiber prepared by the mixed powder by adopting an extrusion spinning method can be seen by an electron microscope picture and is uniformly dispersed.
Example 3
Taking 200g of graphene derivative micro powder with fluorine atom functional groups, gradually adding 5kg of aviation kerosene mixed with 300g of diffusant components under stirring, and stirring for 1hr under the condition that the rotation speed of a stirrer is 50rpm and the temperature is lower than 19 ℃. The components of the dispersing agent: the mass of PD-85 dispersant, octyl tin mercaptide stabilizer and MPEG750 nonionic active agent is respectively 140g, 80g and 80g, the materials are stirred and mixed by a homogenizer, and the rotating speed of the homogenizer is 1500rpm to obtain mixed powder. The split fiber prepared by the mixed powder by adopting an extrusion spinning method can be seen by an electron microscope picture and is uniformly dispersed.
35kg of the polytetrafluoroethylene dispersion resin powder passed through the sieve was slowly poured into the above mixture, and stirred at a low speed of 50rpm and below 19 ℃ for 30 minutes to obtain a mixed powder.
And preparing the graphene/polytetrafluoroethylene nano composite split fiber from the mixed powder by adopting an extrusion spinning method.
Comparative example 1
1. Taking a PD-85 dispersing agent, an octyl tin mercaptide stabilizing agent and an MPEG750 nonionic surfactant, and mixing the components in a proportion of 7:6: mixing at a weight ratio of 7, stirring with a homogenizer at a rotation speed of 1500rpm for 30min to obtain a diffuser component micro powder mixture, and stirring 600g of the diffuser component micro powder mixture and 360g of reduced graphene oxide micro powder at a low speed of 50rpm and below 19 ℃ to obtain mixed powder.
2. Slowly pouring the mixed powder into 40kg of DF-204 polytetrafluoroethylene dispersion resin powder, and stirring for 1h at a low speed of 50rpm and a temperature lower than 19 ℃ by using a stirrer to obtain the mixed powder.
An electron microscope image of the graphene/polytetrafluoroethylene nanocomposite split fiber prepared by the mixed powder by adopting an extrusion spinning method is shown in fig. 2, wherein the micro powder is seen to be in a large lump shape, and the reason is that the two micro powders of the graphene derivative and the polytetrafluoroethylene are not uniformly dispersed.
Comparative example 2
1. Taking a PD-85 dispersing agent, an octyl tin mercaptide stabilizing agent and an MPEG750 nonionic surfactant, mixing the components in a ratio of 7:6: mixing at a weight ratio of 7, stirring with a homogenizer at a rotation speed of 1500rpm for 30min to obtain a diffuser component micro powder mixture, and stirring and mixing 50g of the diffuser component micro powder mixture and 500g of reduced graphene oxide micro powder at a speed of 100rpm to obtain mixed powder.
2. The mixed powder was slowly poured into 40kg of DF-204 polytetrafluoroethylene dispersion resin powder and stirred with a stirrer at 100rpm for 1 hour to obtain a mixed powder.
An electron microscope image of the graphene/polytetrafluoroethylene nanocomposite split-film fiber prepared from the mixed powder by an extrusion spinning method is shown in fig. 3, wherein the powder is seen to be in an uneven block shape, and the two micro powders of the graphene derivative and the polytetrafluoroethylene are also unevenly dispersed.
The steps of the extrusion spinning method adopted by the above examples and comparative examples are as follows:
1. slowly pouring 35kg of the mixed powder into 5kg of aviation kerosene, stirring for 30min with a low-speed stirrer at the rotation speed of 50rpm, wherein the ambient temperature is lower than 19 ℃, and standing the mixed material at normal temperature (25-30 ℃) for 12hr for curing. Example 3 40kg of the compounded material with the lubricant was aged at room temperature (25-30 ℃ C.) for 12 hr.
2. And lifting the cured 40kg mixing barrel to the top of a prepress by a lifter, slowly pouring the mixture into a material port of the prepress, and performing prepressing treatment. The pre-pressing time is 30min, and the pressure is 5.5MPa. And horizontally placing the pre-pressed material on a pushing machine for pushing. The pressure of a pushing machine is 8.5MPa, the temperature of a pushing material cavity is 35 ℃, the temperature of a pushing opening die is 55 ℃, the ambient temperature is 20-25 ℃, the temperature of a water tank is 55 ℃, the compression ratio of the opening die is 130, the length-diameter ratio is 40, and the cone angle is 30 0 After prepressing and pushing, the mixture is formed into a cylindrical die blank with the diameter of 14.5 mm.
3. The cylindrical graphene/polytetrafluoroethylene film blank enters the fish tail-shaped guide plate, the calendered film with the width of 16 cm and the thickness of 0.25 cm is prepared under the action of the calendering roller with the diameter of 150 cm and the width of 30 cm on the calender, the width of the calendered film is 20-25mm, and the calendered baseband after calendering is wound on a winding shaft. The speed of the calendering roller is 12m/min, the hot water temperature of the calendering roller is 60 ℃, and the surface temperature of the calendering roller is 70 ℃.
4. After being unreeled, a winding shaft of the calendering base band enters an oil removing tank, the temperature of the oil removing tank is 270 ℃, the feeding and output speed is 30m/min, and the oil removing time is 6 seconds; and (3) the deoiled and degreased calendered base belt passes through a cooling water roller to rapidly cool the base belt, the temperature of the base belt discharged out of the box body is close to room temperature, and the deoiled calendered base belt is flatly wound on the base belt roller.
5. And (3) unwinding the graphene/polytetrafluoroethylene calendering base band roller, and enabling the base band to enter an oven for heating and stretching, wherein the base band feeding speed is 4m/min, the oven temperature is 310 ℃, and the output speed is 18m/min. The stretching ratio is 4.5 times, the film tape width is 8 cm, the strip-shaped graphene/polytetrafluoroethylene film tape is stretched, cooled by a cooling water roller and then wound on a film tape shaft, and the wound film tape is thermally relaxed for 1hr in a heat preservation chamber at 40 ℃.
6. Unwinding a graphene/polytetrafluoroethylene film tape reel, feeding the tape reel into a slitting device, and controlling the tension of the slitting device to be 120%; the base band is cut into 34 flat filaments with the width of 2.4mm by adopting a coaxial blade cutting method, the linear speed of the cutting is controlled at 2.0m/min, the cut flat filaments are respectively fed into an oven for secondary heating and stretching through a splitting device except two side filaments, the temperature of the oven is 330 ℃, the feeding speed is 2m/min, the output speed is 16m/min, the thickness of a blade is 0.15mm, the two side filaments are wound on a winding head below the cutting device, and the rest 32 flat filaments pass through a heating box and are respectively wound on a rear winding shaft after heating and stretching.
7. The cut and heated and stretched flat filaments are thermally sized and then twisted, the length of a thermally sizing area is 20 cm, the temperature is controlled at 370 ℃, the sizing time is 1.2min, the cut and heated flat filaments are twisted into finished filaments in a twisting machine, the twisting direction S twist is achieved, the twist degree is 450 twist/m, and the feeding output speed is 40m/min.
8. And winding the finished graphene/polytetrafluoroethylene nano composite film split filament after shaping and twisting on a paper tube.

Claims (8)

1. A method for mixing graphene/polytetrafluoroethylene nanometer micropowder is characterized by comprising the steps of primary mixing or secondary mixing;
the primary mixing method comprises the following steps:
uniformly stirring and mixing the graphene derivative and the diffusant at the rpm of 30-50 and the temperature lower than 19 ℃, and then stirring and mixing the graphene derivative and the diffusant with the polytetrafluoroethylene dispersion resin at the rpm of 30-50 and the temperature lower than 19 ℃; the mass ratio of the graphene derivative to the dispersing agent to the polytetrafluoroethylene dispersion resin is 0.5-1:1.0-2.5:50-100 parts of; the mass ratio of the graphene derivative to the dispersing agent to the polytetrafluoroethylene dispersion resin is preferably 0.8-1:1.5-2.0:50-80 parts of;
or mixing a lubricant added with a diffusant component into the graphene derivative, uniformly stirring, adding polytetrafluoroethylene dispersion resin, and stirring and mixing at the speed of 30-50 rpm; the mass ratio of the graphene derivative to the dispersing agent to the lubricant to the polytetrafluoroethylene dispersion resin is 0.5-1:1.0-2.5:25-30:65-70 parts of;
the secondary mixing method comprises the following steps:
mixing a dispersing agent into the micro powder of the graphene derivative, uniformly stirring, adding polytetrafluoroethylene dispersion resin, and mixing to obtain a prefabricated mixture; and stirring and mixing the prepared mixture and the polytetrafluoroethylene dispersion resin for the second time at the speed of 30-50rpm to obtain a mixture.
2. The method for mixing graphene/polytetrafluoroethylene nanopowder according to claim 1, characterized in that the graphene derivative is graphene oxide, reduced graphene oxide, graphene Nanoplatelets (GNPs), fluorine atom-containing functional group graphene oxide or functionalized graphene; the average particle diameter of the graphene derivative is 50-300nm, and the carbon content of the graphene derivative>97% of specific surface area of 30-60m 2 (iv) g; the graphene derivative can resist the high temperature of more than 360 ℃.
3. The method for mixing graphene/polytetrafluoroethylene nanopowder according to claim 1, wherein the mass ratio of the graphene derivative to the polytetrafluoroethylene dispersion resin powder in the primary mixing process is 0.5-1:100.
4. the method for mixing the graphene/polytetrafluoroethylene nano micro powder according to claim 1, wherein the dispersing agent is prepared from a dispersing agent, a stabilizing agent and a nonionic surfactant by stirring and mixing through a homogenizer, and the mass ratio of the dispersing agent to the nonionic surfactant is 3-11:3-8:3-11; the mass of the dispersing agent is 1.0-2.5% of that of the polytetrafluoroethylene dispersion resin.
5. The method for mixing graphene/polytetrafluoroethylene nanopowder according to claim 4, characterized in that the dispersant is PD-85 dispersant; the stabilizer is octyl tin mercaptide stabilizer; the nonionic surfactant is MPEG750 nonionic surfactant.
6. The method for mixing graphene/polytetrafluoroethylene nanopowder according to claim 1, wherein the polytetrafluoroethylene dispersion resin is polytetrafluoroethylene resin powder with a crystallinity of more than 98% and an average particle size of 200-300 μm, and the polytetrafluoroethylene resin powder is sieved with a 8-20 mesh sieve at an ambient temperature of less than 19 ℃ to remove agglomerated particles.
7. The method of claim 1, wherein the lubricant is selected from the group consisting of paraffin oil, petroleum ether, kerosene, and jet fuel.
8. The method of claim 7, wherein the lubricant is jet fuel.
CN202211020944.6A 2022-08-24 2022-08-24 Method for mixing graphene/polytetrafluoroethylene nano micro powder Pending CN115260539A (en)

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