CN115262016A - Preparation method of graphene/polytetrafluoroethylene nano composite membrane split colored fibers - Google Patents
Preparation method of graphene/polytetrafluoroethylene nano composite membrane split colored fibers Download PDFInfo
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- CN115262016A CN115262016A CN202211020929.1A CN202211020929A CN115262016A CN 115262016 A CN115262016 A CN 115262016A CN 202211020929 A CN202211020929 A CN 202211020929A CN 115262016 A CN115262016 A CN 115262016A
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 118
- 239000004810 polytetrafluoroethylene Substances 0.000 title claims abstract description 112
- 229920001343 polytetrafluoroethylene Polymers 0.000 title claims abstract description 112
- 229910021389 graphene Inorganic materials 0.000 title claims abstract description 94
- 239000000835 fiber Substances 0.000 title claims abstract description 50
- 239000002114 nanocomposite Substances 0.000 title claims abstract description 36
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 239000012528 membrane Substances 0.000 title abstract description 9
- -1 polytetrafluoroethylene Polymers 0.000 claims abstract description 53
- 239000011347 resin Substances 0.000 claims abstract description 35
- 229920005989 resin Polymers 0.000 claims abstract description 35
- 239000002270 dispersing agent Substances 0.000 claims abstract description 30
- 239000006185 dispersion Substances 0.000 claims abstract description 29
- 238000002156 mixing Methods 0.000 claims abstract description 29
- 239000000203 mixture Substances 0.000 claims abstract description 28
- 239000000463 material Substances 0.000 claims abstract description 23
- 238000000034 method Methods 0.000 claims abstract description 19
- 239000000049 pigment Substances 0.000 claims abstract description 13
- 239000001023 inorganic pigment Substances 0.000 claims abstract description 11
- 239000002131 composite material Substances 0.000 claims abstract description 8
- 238000003490 calendering Methods 0.000 claims description 41
- 239000000843 powder Substances 0.000 claims description 36
- 238000003756 stirring Methods 0.000 claims description 31
- 238000010438 heat treatment Methods 0.000 claims description 26
- 238000004804 winding Methods 0.000 claims description 22
- 238000005520 cutting process Methods 0.000 claims description 18
- 239000002245 particle Substances 0.000 claims description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 238000005238 degreasing Methods 0.000 claims description 12
- 238000009998 heat setting Methods 0.000 claims description 10
- 238000003825 pressing Methods 0.000 claims description 10
- 238000005096 rolling process Methods 0.000 claims description 10
- 239000000314 lubricant Substances 0.000 claims description 9
- 239000003381 stabilizer Substances 0.000 claims description 9
- 239000000498 cooling water Substances 0.000 claims description 8
- 239000013543 active substance Substances 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 6
- 230000009471 action Effects 0.000 claims description 5
- 230000006835 compression Effects 0.000 claims description 5
- 238000007906 compression Methods 0.000 claims description 5
- 230000032683 aging Effects 0.000 claims description 3
- 238000002788 crimping Methods 0.000 claims description 3
- 125000001153 fluoro group Chemical group F* 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- 238000001723 curing Methods 0.000 claims description 2
- 229910052731 fluorine Inorganic materials 0.000 claims description 2
- 125000000524 functional group Chemical group 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 claims 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical group C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims 1
- 239000002064 nanoplatelet Substances 0.000 claims 1
- 238000004040 coloring Methods 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 13
- 239000003350 kerosene Substances 0.000 description 9
- 238000007873 sieving Methods 0.000 description 7
- 239000002184 metal Substances 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 229910017052 cobalt Inorganic materials 0.000 description 5
- 239000010941 cobalt Substances 0.000 description 5
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 5
- 238000000227 grinding Methods 0.000 description 5
- 238000005054 agglomeration Methods 0.000 description 4
- 230000002776 aggregation Effects 0.000 description 4
- 239000001055 blue pigment Substances 0.000 description 4
- 229910052793 cadmium Inorganic materials 0.000 description 4
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- SZVJSHCCFOBDDC-UHFFFAOYSA-N ferrosoferric oxide Chemical compound O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 4
- ZMHZSHHZIKJFIR-UHFFFAOYSA-N octyltin Chemical group CCCCCCCC[Sn] ZMHZSHHZIKJFIR-UHFFFAOYSA-N 0.000 description 4
- 238000004806 packaging method and process Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- 238000011033 desalting Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000011812 mixed powder Substances 0.000 description 3
- 238000000643 oven drying Methods 0.000 description 3
- 238000004321 preservation Methods 0.000 description 3
- 238000004513 sizing Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000001034 iron oxide pigment Substances 0.000 description 2
- WTFXARWRTYJXII-UHFFFAOYSA-N iron(2+);iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[Fe+2].[Fe+3].[Fe+3] WTFXARWRTYJXII-UHFFFAOYSA-N 0.000 description 2
- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 239000002105 nanoparticle Substances 0.000 description 2
- 239000002736 nonionic surfactant Substances 0.000 description 2
- 241000251468 Actinopterygii Species 0.000 description 1
- 239000005662 Paraffin oil Substances 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000012620 biological material Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000002041 carbon nanotube Substances 0.000 description 1
- 229910021393 carbon nanotube Inorganic materials 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000010035 extrusion spinning Methods 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000007306 functionalization reaction Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229920006253 high performance fiber Polymers 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000013035 low temperature curing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000002120 nanofilm Substances 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- 239000002135 nanosheet Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000001054 red pigment Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 239000011540 sensing material Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
Classifications
-
- 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
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/42—Formation of filaments, threads, or the like by cutting films into narrow ribbons or filaments or by fibrillation of films or filaments
- D01D5/426—Formation of filaments, threads, or the like by cutting films into narrow ribbons or filaments or by fibrillation of films or filaments by cutting films
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention discloses a preparation method of a graphene/polytetrafluoroethylene nano composite membrane split colored fiber, which adopts a method of slowly mixing inorganic high-temperature-resistant pigment, a graphene derivative, a dispersing agent and polytetrafluoroethylene dispersion resin, or prefabricating a mixture of graphene and polytetrafluoroethylene dispersion resin and then mixing the mixture of the inorganic pigment and the polytetrafluoroethylene resin for one time or two times, so that the materials are mixed more uniformly. The method improves the use performance of the graphene/polytetrafluoroethylene composite fiber, enlarges the use range, and effectively solves the problem of difficult coloring of the graphene/PTFE nano composite fiber.
Description
Technical Field
The invention relates to the field of high-performance fiber materials, in particular to a graphene/polytetrafluoroethylene nano composite film split colored fiber which is formed by compounding two nano materials of graphene and polytetrafluoroethylene. The graphene/polytetrafluoroethylene nano composite film split colored fiber is suitable for the fields of aerospace, aviation, national defense and military industry, in particular to the industries of electric wires and cables, strong current and weak current transmission signals, shielding and radiation protection.
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, electric conductivity and thermal conductivity, and can bear extremely high current density, and therefore has important potential application prospects 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.
With the rapid development of new material industry in the world, the application of composite materials becomes a topic of research on hot topics and competitive investment of scientists in various countries. The graphene/polytetrafluoroethylene nano composite material is prepared by the functionalization, modification and grafting of two materials of graphene and polytetrafluoroethylene, and the research of improving the mechanical property and hardness of the polytetrafluoroethylene and improving various excellent properties of the composite material is broken through by utilizing the characteristics of high strength and stable structure of the graphene. The Beijing aviation materials institute Guo Jianjiang, li Jiongli, beijing graphene technology institute Wang Xudong, and the like, published a paper on the fifteenth national friction meeting at 11 months in 2021, the paper on the influence of graphene on the friction and wear performance of the polytetrafluoroethylene synergistically modified by the auxiliary multi-component filler, and the paper on the preparation and performance of the polytetrafluoroethylene/graphene composite material, published by Sichuan university Chen Li, and the like; shanghai university of traffic sees Xuezhen et al published a paper of "carbon nanotube and graphene containing PTFE base composite frictional wear performance", and an invention patent with application number 201310273258.4 discloses a preparation method of graphene/thermal efficiency liquid crystal wholly aromatic polyester composite material ".
The method adopts the formed commercial graphene and the derivative products thereof to prepare the colored fibers split by the graphene/polytetrafluoroethylene nano composite film, including the colored filaments or the colored short fibers split by the graphene/polytetrafluoroethylene nano composite film. Compared with the existing polytetrafluoroethylene colored filament or short fiber, the breaking strength of the colored filament or short fiber is respectively improved by more than 10 percent and 8 percent, and the fiber has new excellent electric conduction and heat conduction functions.
Disclosure of Invention
The invention aims to provide a preparation method of a graphene/polytetrafluoroethylene nano composite membrane split colored fiber. Compared with the existing polytetrafluoroethylene colored filament or short fiber, the breaking strength of the colored filament or short fiber is respectively improved by more than 10 percent and 8 percent, and the fiber is endowed with new excellent electric conduction and heat conduction functions and has excellent color fastness.
The purpose of the invention is realized by the following modes:
a preparation method of colored fibers split by a graphene/polytetrafluoroethylene nano composite film comprises the following steps:
stirring and mixing inorganic high-temperature-resistant pigment fine powder, graphene derivatives, a dispersing agent and polytetrafluoroethylene dispersion resin at 30-50rpm and below 19 ℃ to obtain a mixture; the mass ratio of the inorganic pigment fine powder to the graphene derivative to the dispersing agent to the polytetrafluoroethylene dispersion resin is 0.5-1.5:0.5-1.5:1-2.5:60-90; the mass ratio of the dispersing agent is 1-14:1-8:1-11 of dispersing agent, stabilizing agent and nonionic active agent are stirred and mixed by a homogenizer; adding a lubricant into the mixture, uniformly mixing, curing, prepressing, pushing, rolling to form a film, drying and degreasing, heating and stretching for the first time, slitting, hot stretching for the second time, and then performing heat setting and twisting to obtain finished silk, winding or curling and cutting, wherein the mass ratio of the mixture to the lubricant is 5-8:1,30-50 rpm, stirring for 15-30min, and keeping the ambient temperature below 19 deg.C;
or 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; the mass ratio of the dispersing agent is 1-14:1-8:1-11 of dispersing agent, stabilizing agent and nonionic active agent are stirred and mixed by a homogenizer; the mass ratio of the graphene derivative to the polytetrafluoroethylene dispersion resin is 1-2.5:100-200 parts of; the mass ratio of the dispersing agent to the micro powder of the graphene derivative is 4-6:4-6; stirring and mixing the prefabricated graphene/polytetrafluoroethylene composite material micro powder, inorganic pigment fine powder and polytetrafluoroethylene dispersion resin for the second time to obtain a mixture; wherein the mass ratio of the prefabricated graphene/polytetrafluoroethylene nanocomposite micro powder to the pigment fine powder to the polytetrafluoroethylene dispersion resin in the secondary stirring and mixing is 3-7:0.05-0.1:3-5, stirring speed is 30-50rpm, and stirring time is 15-30min; adding lubricant into the mixture, mixing, aging, pre-pressing, pushing, rolling to form film, drying, degreasing, heating and stretching for the first time, cutting, hot stretching for the second time, and then performing heat setting and twisting to obtain finished silk, winding or curling and cutting; the mass ratio of the mixture to the lubricant is 5-8: 5363 and mixing uniformly at 1,30-50 rpm for 15-30min at ambient temperature below 19 deg.C.
The pre-pressing and pushing are to pre-press the cured clinker through a pre-press, push and press the pre-pressed molded product on the push-press to prepare a cylindrical graphene/polytetrafluoroethylene mold blank, wherein the diameter of the mold blank is 14.5-15mm; the pressure of the prepress is 5.5-6.5MPa, the speed is 15-30m/min, the pressure of the pushing press is 8.5-9.5MPa, the temperature of a material cavity during pushing is 35-40 ℃, the temperature of a pushing opening die is 55-65 ℃, the ambient temperature is 20-25 ℃, the temperature of a water tank is 50-60 ℃, the compression ratio of the opening die is 130-150, the length-diameter ratio is 40-45, and the cone angle is 30-35 0 。
The rolling film forming is that a cylindrical graphene/polytetrafluoroethylene mold blank obtained after pushing enters a fishtail-shaped guide plate and is made into a rolling film under the action of a rolling roller of a rolling machine; the diameter of the calendering roller is 1500mm, the width is 300mm, the speed is 2.5-15m/min, the temperature of hot water in the calendering roller is 60-80 ℃, the width of the calendered film is 20-25mm, and the thickness is 0.25-0.40mm.
The drying and degreasing step is that the rolled film obtained after rolling enters a degreasing tank, the temperature in the tank is 270-280 ℃, the feeding and output speed is 30-40m/min, and the degreasing time is 5-10 seconds; and (4) carrying out flash cooling on the degreased rolled base band by a cooling water roller, and winding the base band which is taken out of the box body and has the temperature close to room temperature into a base band disk.
The first heating and stretching is to enter the dried and degreased base band into an oven for heating and stretching, the temperature of the oven is 300-310 ℃, the feeding speed of the base band is 4-6m/min, the output speed is 18-30m/min, the stretching multiple is 4.5 times, the stretched strip-shaped graphene/polytetrafluoroethylene film band is cooled by a cooling roller and then wound on a film band shaft, and the wound film band is relaxed for 1-2 hours at the temperature of 25-40 ℃.
Slitting and secondary hot stretching: unreeling the film tape spool obtained after the first heating and stretching, feeding the film tape spool into a slitting device, controlling the tension of the slitting device to be 100-120%, slitting the film tape spool by adopting a coaxial blade, slitting the base tape into flat wires, controlling the linear speed of slitting to be 2.0m/min, controlling the thickness of the blade to be 0.12-0.25mm, feeding the slit flat wires into an oven for second heating and stretching, controlling the temperature of the oven to be 330-350 ℃, the feeding speed to be 2-6m/min and the output speed to be 16-50m/min, and respectively winding the heated and stretched flat wires.
The heat setting and twisting is to obtain flat filaments through secondary heat stretching and winding, and the flat filaments are twisted through heat setting; the heat setting temperature is controlled at 330-370 ℃, the setting time is 0.5-1.5min, the finished yarn is twisted by a twisting machine after setting, the twisting direction is S twist, the twist number is 300-800 twist/m, and the feeding speed is 30-40m/min.
The colored short fiber is prepared by coiling, cutting, opening and packing the colored filament wound into a shaft. The linear speed of the crimper is 5-6m/min, the crimpness is 80-150/m, and the cutting length is 20-38mm.
The inorganic high-temperature resistant pigment fine powder has the advantages of high temperature resistance of more than 350 ℃, particle size of 25-50 mu m, and 2-3 times of screening before use to prevent fine powder agglomeration. The addition amount of the inorganic high-temperature resistant pigment fine powder is 0.5-1.0 percent of the total mass of the mixture.
The graphene derivative can be Graphene Oxide (GO), reduced Graphene Oxide (RGO), graphene Nanosheets (GNPs), fluorine atom-containing functional group graphene oxide or functionalized graphene such as amphiphilic graphene and the like. 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 needs to resist high temperature of more than 360 ℃.
The polytetrafluoroethylene dispersion resin is polytetrafluoroethylene resin powder with the crystallinity of more than 98 percent and the average grain diameter of 200-300 mu m, and is sieved by a filter screen with 8-20 meshes under the environmental condition of less than 19 ℃ to remove agglomerated particles.
The graphene derivative can be micro-tablets or micro-powder, and the polytetrafluoroethylene dispersion resin is nano-particles, micro-powder or emulsion.
The lubricant is paraffin oil, petroleum ether, white kerosene, aviation kerosene and the like, preferably aviation kerosene.
The two materials of the graphene derivative and the polytetrafluoroethylene dispersion resin are easy to generate agglomeration phenomenon when being mixed, so that the requirement on mixing is high. The two mixing methods selected by the invention can fully disperse the graphene and the polytetrafluoroethylene, and are more suitable for industrial production.
The invention adds the diffusant components of various components, and can effectively prevent the agglomeration of two types of nano particles. Preferably, the dispersant is PD-85 dispersant; the stabilizer is octyl tin mercaptide stabilizer; the nonionic surfactant is MPEG750 nonionic surfactant.
Compared with the prior art, the invention has the beneficial effects that:
1. the inorganic high-temperature-resistant pigment, the graphene derivative, the dispersing agent and the polytetrafluoroethylene dispersion resin are mixed at a low speed, or a mixture of the graphene and the polytetrafluoroethylene dispersion resin is prepared first and then is mixed with the mixture of the inorganic pigment and the polytetrafluoroethylene resin for one time or two times, so that the materials are mixed more uniformly, the agglomeration phenomenon of the polytetrafluoroethylene dispersion resin can be avoided, and the product quality is ensured.
2. The method effectively solves the problem that the graphene/PTFE nano composite fiber is difficult to color, improves the service performance of the graphene/PTFE nano composite fiber, and enlarges the application range.
3. Aiming at the addition of the graphene derivative, the technical conditions for preparing the graphene/PTFE nano composite membrane split colored fiber are beneficially adjusted, a specific process route of an extrusion spinning method is adopted, two new materials of graphene and polytetrafluoroethylene are effectively combined, the breaking strength of the obtained colored fiber is improved by more than 10% compared with that of the existing polytetrafluoroethylene fiber, and the fiber is endowed with new excellent electric conduction and heat conduction functions, so that a new application field of military shielding materials can be developed. In addition, the low-temperature curing treatment at 25-30 ℃ is adopted in the film cracking process route, and meanwhile, the stretching temperature is also low, so that the energy is saved, the consumption is reduced, and the excellent performance of the product can be still maintained.
4. In the process of preparing the black filaments by the graphene/polytetrafluoroethylene nano composite membrane through the secondary mixing method, the inorganic high-temperature-resistant pigment with a specific dosage is added during secondary mixing, so that coloring is more uniform and color fastness is better.
Detailed Description
The present invention will be described in further detail with reference to examples. It is to be understood that the described embodiments are merely a few embodiments of the invention and are not to be taken as a full range of embodiments. Based on the embodiments of the present invention, other embodiments obtained by a person of ordinary skill in the art without any creative effort belong to the protection scope of the present invention.
Natural inorganic pigments are produced by petrochemical technology ltd, zhongli, shandong.
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 Co., ltd in eastern Shandong.
Example 1
The process flow for preparing the black split filament of the graphene/polytetrafluoroethylene nanocomposite film by secondarily mixing the iron oxide black natural black pigment, the graphene/polytetrafluoroethylene nanocomposite and the polytetrafluoroethylene resin is as follows:
1. grinding black iron oxide pigment with water for 24hr at 800rpm speed, sieving with 800-mesh and 1300-mesh metal screens, desalting to remove metal salt ions, and oven drying to obtain inorganic black iron oxide pigment with particle size of 25-50 μm.
2. And (3) sieving the reduced graphene oxide micro powder and the polytetrafluoroethylene dispersion resin powder by using a 20-mesh filter screen for two times respectively at the temperature of below 19 ℃ to remove agglomerated particles.
3. Preparing a graphene/polytetrafluoroethylene nanocomposite: pouring 200g of reduced graphene oxide and 300g of a dispersing agent component into 2kg of aviation kerosene, stirring and dispersing for 30min by using an inlet homogenizer, adding 20kg of polytetrafluoroethylene dispersion resin, stirring for 15min by using a stirrer, and heating in a heating box to completely volatilize the aviation kerosene and the dispersing agent component. Placing the reduced graphene oxide/polytetrafluoroethylene into a die, carrying out cold press molding under 45MPa, sintering at 350 ℃, and grinding into reduced graphene oxide/polytetrafluoroethylene nanocomposite powder by using a grinder.
The components of the dispersing agent: the mass of the PD-85 dispersant, the mass of the octyl tin mercaptide stabilizer and the mass of the HTY-85-1 nonionic active agent are respectively 110g, 80g and 110g.
The homogenizer speed was 1500rpm, the stirrer stirring speed was 50rpm, and the grinder grinding speed was 500rpm.
4. And (2) pouring 150g of iron oxide black pigment into 15kg of polytetrafluoroethylene dispersion resin, stirring and mixing at the mixing temperature of 19 ℃, the stirring speed of 500rpm for 30min, pouring 20kg of prefabricated reduced graphene oxide/polytetrafluoroethylene nano composite powder into the mixture mixed with the pigment, stirring and mixing at the environment temperature of lower than 19 ℃, the stirring time of 20min and the stirring speed of 50rpm of a stirrer.
5. Slowly pouring 3 mixed powders into 5kg of aviation kerosene, stirring with a low speed stirrer at 50rpm for 30min at ambient temperature below 19 deg.C, standing at normal temperature (25-30 deg.C) for 12hr, and aging.
6. 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 the pushing machine is 8.5MPa, the temperature of the pushing material cavity is 35 ℃, the temperature of the pushing opening die is 55 ℃, the ambient temperature is 20-25 ℃, the temperature of the 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.
7. The cylindrical graphene/polytetrafluoroethylene film blank enters the fishtail-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 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 ℃.
8. 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 calendering base band passes through a cooling water roller to carry out flash cooling on the base band, the temperature of the base band discharged out of the box body is close to the room temperature, and the deoiled calendering base band is flatly wound on the base band roller.
9. 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 width of the film tape is 8cm, the strip-shaped graphene/polytetrafluoroethylene film tape is cooled by a cooling water roller after being stretched, and then is wound on a film tape shaft, and the wound film tape is thermally relaxed for 1hr in a heat preservation chamber at the temperature of 40 ℃.
10. 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.
11. 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.
12. The shaped and twisted graphene/polytetrafluoroethylene nano film split black filaments are wound on a paper tube and become commercial filaments after being inspected to be qualified for sale.
5 samples are parallelly taken for performance test and are compared with physical indexes of the polytetrafluoroethylene membrane cracked black filaments, through data analysis, the fracture strength of the graphene/polytetrafluoroethylene nano composite membrane cracked black filaments is respectively 16.2 percent higher than the value of the polytetrafluoroethylene membrane cracked black filaments, and the conductivity is 1.8sm -1 。
EXAMPLE 1 Properties of the products
The above tests are in accordance with the GB/T35748-2017 Polytetrafluoroethylene filament Standard.
Example 2
The technological process for preparing the graphene/polytetrafluoroethylene red membrane-cracked staple fibers by mixing the cadmium red inorganic pigment, the graphene derivative and the polytetrafluoroethylene resin for one time is as follows:
1. grinding cadmium red inorganic pigment with water for 24hr, sieving with 800 mesh and 1300 mesh metal screens, desalting to remove metal salt ions, and oven drying to obtain cadmium red pigment with particle size of 25-50 μm.
2. And (3) respectively sieving the amphiphilic graphene oxide micro powder and the polytetrafluoroethylene dispersion resin powder twice by using a 20-mesh filter screen at the temperature of below 19 ℃ to remove agglomerated particles.
3. Taking 150g of screened cadmium red inorganic pigment, 200g of amphiphilic graphene oxide, 300g of dispersing agent component and 35kg of polytetrafluoroethylene dispersion resin powder, stirring and mixing, sieving for 2 times by using a 20-mesh filter screen at the temperature lower than 19 ℃, removing agglomerated particles, stirring for 30min, and stirring at the speed of 50rpm. The components of the dispersing agent: the mass of the PD-85 dispersant, the mass of the octyl tin mercaptide stabilizer and the mass of the HTY-85-1 nonionic active agent are respectively 110g, 80g and 110g.
4. And slowly pouring 5kg of aviation kerosene into the above 35kg of mixture, and stirring for 30min by using a low-speed stirrer with the rotation speed of 50rpm, wherein the ambient temperature is lower than 19 ℃. The obtained mixed powder is aged at normal temperature (25-30 deg.C) for 16 hr.
5. And lifting the cured 40kg mass cylinder to the top of the 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 10MPa, 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 60 ℃, 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.
6. The cylindrical graphene/polytetrafluoroethylene film blank enters the fish tail-shaped guide plate, and is made into a calendered film with the thickness of 0.4 cm and the diameter of 16 cm under the action of a calendering roller with the width of 30 cm and the diameter of 150 cm on a calender. The speed of the calendering roller is 12m/min, the hot water temperature of the calendering roller is 80 ℃, and the surface temperature of the calendering roller is 70 ℃.
7. Winding the calendered base band after the graphene/polytetrafluoroethylene calendering on a winding shaft, feeding the calendered base band into an oil removal tank after the calendering base band is unwound, wherein the temperature of the oil removal tank is 280 ℃, the feeding and output speed is 35m/min, the oil removal time is 6 seconds, the base band after oil removal and degreasing passes through a cooling water roller, carrying out flash cooling on the base band, the temperature of the base band discharged from a box body is close to room temperature, and the calendered base band after oil removal is smoothly wound on the base band roller.
8. Unreeling a graphene/polytetrafluoroethylene film, enabling the baseband to enter an oven for heating and stretching, wherein the feeding speed of the baseband is 5m/min, the temperature of the oven is 310 ℃, the output speed is 20m/min, the stretching ratio is 4 times, the width of the film tape is 8cm, the strip 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 with the room temperature of 40 ℃;
9. unwinding a film disc and entering a slitting device, wherein the slitting device is in a tension state, and the tension is controlled to be 120%; the slitting adopts a coaxial blade cutting method, a film belt with the width of 8cm is slit into 34 flat wires with the width of 2.4mm, the linear speed of the slitting is controlled to be 2.0m/min, the film belt enters an oven through a slitting device for secondary heating and stretching except for two side wires, the temperature of the oven is 350 ℃, the feeding speed is 2m/min, the output speed is 16m/min, the thickness of a blade is 0.15mm, the two side wires are wound on a winding head below the slitting device, and the other 32 flat wires pass through a heating box and are wound on a rear winding shaft after heating and stretching.
10. And (3) twisting the cut and heated and stretched flat filaments by thermal setting, wherein the length of a thermal setting area is 20 cm, the temperature is controlled at 340 ℃, the setting time is 1.2min, the cut and stretched flat filaments are twisted by a twisting machine after setting, the twisting direction is S twist, the twist degree is 350 twist, and the feeding output speed is 40m/min.
11. And winding the shaped and twisted graphene/polytetrafluoroethylene nano composite red film-cracked filament on a paper tube.
12. The red graphene/polytetrafluoroethylene nano filaments on the filament cylinder enter a crimping machine to enable the original smooth filaments to be in a curled shape, and the curled filaments are cut into short fibers through a cutting machine. The crimper speed was 3m/min, the crimpability was 120/m, and the cut length was 38mm.
13. Opening, metering and packaging: opening the curled short fibers into fluffy fibers by an opener, and packaging after metering.
EXAMPLE 2 Properties of the products
| Properties of fiber | Test value |
| Colour(s) | Red colour |
| Fiber Density (dtex) | 24.7 |
| Fiber length (mm) | 38 |
| Colour fastness (grade) | 4-5 stages |
| Cross section of | Rectangle |
| Degree of crimp (individual/m) | 120 |
Example 3:
the technological process for preparing the blue split short fibers of the graphene/polytetrafluoroethylene nano composite film by mixing the cobalt blue pigment, the graphene derivative and the polytetrafluoroethylene resin at one time comprises the following steps:
1. grinding cobalt blue natural blue pigment with water for 24hr, sieving the ground cobalt blue pigment with 800-1300 mesh metal screen, desalting to remove metal salt ions, and oven drying to obtain cobalt blue pigment with particle size of 25-50 μm.
2. And (3) respectively sieving the amphiphilic graphene oxide micro powder and the polytetrafluoroethylene dispersion resin powder twice by using a 20-mesh filter screen at the temperature of below 19 ℃ to remove agglomerated particles.
3. 150g of screened cobalt blue inorganic pigment, 200g of amphiphilic graphene oxide, 300g of dispersing agent component and 35kg of polytetrafluoroethylene dispersion resin powder are taken to be stirred and mixed, and are sieved for 2 times by a 20-mesh filter screen at the temperature lower than 19 ℃ to remove agglomerated particles, the stirring time is 30min, and the stirring speed is 50rpm. The components of the dispersing agent: the mass of the PD-85 dispersant, the mass of the octyl tin mercaptide stabilizer and the mass of the HTY-85-1 nonionic active agent are respectively 110g, 80g and 110g.
4. And slowly pouring the mixture of 35kg into 5kg of aviation kerosene, and stirring for 30min by using a low-speed stirrer with the rotating speed of 50rpm, wherein the environmental temperature is lower than 19 ℃. The obtained mixed powder is aged at normal temperature (25-30 deg.C) for 16 hr.
5. And lifting the cured 40kg mass cylinder to the top of the 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 10MPa, 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 60 ℃, 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.
6. The cylindrical graphene/polytetrafluoroethylene film blank enters the fishtail-shaped guide plate, and is made into a calendered film with the width of 16 cm and the thickness of 0.4 cm under the action of the calendering roller with the diameter of 150 cm and the width of 30 cm on the calender. The speed of the calendering roller is 12m/min, the hot water temperature of the calendering roller is 80 ℃, and the surface temperature of the calendering roller is 70 ℃.
7. Winding the calendered base band after the graphene/polytetrafluoroethylene calendering on a winding shaft, feeding the calendered base band into an oil removal tank after the calendering base band is unwound, wherein the temperature of the oil removal tank is 280 ℃, the feeding and output speed is 35m/min, the oil removal time is 6 seconds, the base band after oil removal and degreasing passes through a cooling water roller, carrying out flash cooling on the base band, the temperature of the base band discharged from a box body is close to room temperature, and the calendered base band after oil removal is smoothly wound on the base band roller.
8. Unreeling a graphene/polytetrafluoroethylene film, enabling the baseband to enter an oven for heating and stretching, wherein the feeding speed of the baseband is 5m/min, the temperature of the oven is 310 ℃, the output speed is 20m/min, the stretching ratio is 4 times, the width of the film tape is 8cm, the strip graphene/polytetrafluoroethylene film tape is cooled by a cooling water roller after being stretched and then wound on a film tape shaft, and the wound film tape is thermally relaxed for 1hr in a heat preservation chamber with the room temperature of 40-50 ℃;
9. unwinding a film disc and entering a slitting device, wherein the slitting device is in a tension state, and the tension is controlled to be 120%; slitting adopts a coaxial blade cutting method, a film belt with the width of 8cm is cut into 34 flat filaments with the width of 2.4mm, the linear speed of slitting is controlled at 2.0m/min, the film belt enters an oven through a slitting device for secondary heating and stretching except two side filaments, the temperature of the oven is 350 ℃, 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 slitting device, and the rest 32 flat filaments pass through a heating box and are wound on a winding shaft at the back after heating and stretching.
10. The cut and heated and stretched flat filaments are thermally sized and then twisted, the length of a thermally sized area is 20 cm, the temperature is controlled at 340 ℃, the sizing time is 1.2min, the cut and stretched flat filaments are twisted in a twisting machine, the twisting direction S twist is achieved, the twist is 350 twist, and the feeding output speed is 40m/min.
11. The blue filament of graphite alkene/polytetrafluoroethylene nanometer complex film split after the design twisting is coiled on the fiber container.
12. The blue filaments split by the graphene/polytetrafluoroethylene nano composite film on the filament cylinder enter a crimping machine, the original smooth filaments are in a curled shape, and the curled filaments are cut into short fibers by a cutting machine. The crimper speed was 3m/min, the crimpability was 85 pieces/m, and the cut length was 35mm.
13. Opening, metering and packaging: opening the curled short fibers into fluffy fibers by an opener, and packaging after metering.
EXAMPLE 3 product Properties
| Properties of the fiber | Test value |
| Colour(s) | Blue color |
| Fiber Density (dtex) | 24.7 |
| Fiber length (mm) | 35 |
| Colour fastness (grade) | 4-5 stages |
| Cross section of | Rectangle |
| Degree of crimp (individual/m) | 85 |
Claims (10)
1. A preparation method of colored fibers split by a graphene/polytetrafluoroethylene nano composite film is characterized by comprising the following steps:
stirring and mixing inorganic high-temperature-resistant pigment fine powder, graphene derivatives, a dispersing agent and polytetrafluoroethylene dispersion resin at 30-50rpm and below 19 ℃ to obtain a mixture; the mass ratio of the inorganic pigment fine powder to the graphene derivative to the dispersing agent to the polytetrafluoroethylene dispersion resin is 0.5-1.5:0.5-1.5:1-2.5:60-90; the mass ratio of the dispersing agent is 1-14:1-8:1-11 of dispersing agent, stabilizing agent and nonionic active agent are stirred and mixed by a homogenizer; adding a lubricant into the mixture, uniformly mixing, curing, prepressing, pushing, rolling to form a film, drying and degreasing, heating and stretching for the first time, slitting, hot stretching for the second time, and then performing heat setting and twisting to obtain finished silk, winding or curling and cutting, wherein the mass ratio of the mixture to the lubricant is 5-8:1,30-50 rpm, stirring for 15-30min, and keeping the ambient temperature below 19 deg.C;
or 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; the mass ratio of the dispersing agent is 1-14:1-8:1-11 of dispersing agent, stabilizing agent and nonionic active agent are stirred and mixed by a homogenizer; the mass ratio of the graphene derivative to the polytetrafluoroethylene dispersion resin is 1-2.5:100-200; the mass ratio of the dispersing agent to the micro powder of the graphene derivative is 4-6:4-6; stirring and mixing the prefabricated graphene/polytetrafluoroethylene composite material micro powder, inorganic pigment fine powder and polytetrafluoroethylene dispersion resin for the second time to obtain a mixture; wherein the mass ratio of the prefabricated graphene/polytetrafluoroethylene nanocomposite micro powder to the pigment fine powder to the polytetrafluoroethylene dispersion resin in the secondary stirring and mixing is 3-7:0.05-0.1:3-5, stirring speed of 30-50rpm, and stirring time of 15-30min; adding lubricant into the mixture, mixing, aging, pre-pressing, pushing, rolling to form film, drying, degreasing, heating and stretching for the first time, cutting, hot stretching for the second time, and then performing heat setting and twisting to obtain finished silk, winding or curling and cutting; the mass ratio of the mixture to the lubricant is 5-8:1,30-50 rpm, stirring for 15-30min at ambient temperature below 19 deg.C.
2. The method for preparing graphene/polytetrafluoroethylene nanocomposite split fibers according to claim 1, wherein the pre-pressing and pressing are performed to ripen the ripened fibersPrepressing the material through a prepress, pushing and pressing the prepressed molded product on a pushing and pressing machine to prepare a cylindrical graphene/polytetrafluoroethylene mold blank, wherein the diameter of the mold blank is 14.5-15mm; the pressure of the prepress is 5.5-6.5MPa, the speed is 15-30m/min, the pressure of the pushing press is 8.5-9.5MPa, the temperature of a material cavity during pushing is 35-40 ℃, the temperature of a pushing opening die is 55-65 ℃, the ambient temperature is 20-25 ℃, the temperature of a water tank is 50-60 ℃, the compression ratio of the opening die is 130-150, the length-diameter ratio is 40-45, and the cone angle is 30-35 0 。
3. The preparation method of the graphene/polytetrafluoroethylene nanocomposite split fibers according to claim 1, wherein the calendering film formation is that a cylindrical graphene/polytetrafluoroethylene mold blank obtained after pushing enters a fishtail-shaped guide plate and is made into a calendered film under the action of a calendering roller of a calender; the diameter of the calendering roller is 1500mm, the width is 300mm, the speed is 2.5-15m/min, the temperature of hot water in the calendering roller is 60-80 ℃, the width of the calendered film is 20-25mm, and the thickness is 0.25-0.40mm.
4. The preparation method of the graphene/polytetrafluoroethylene nanocomposite split-film fiber according to claim 1, wherein the drying and degreasing are carried out by feeding a rolled film obtained after rolling into a degreasing tank, wherein the temperature in the tank is 270-280 ℃, the feeding and output speed is 30-40m/min, and the degreasing time is 5-10 seconds; and (4) carrying out flash cooling on the degreased rolled base band by a cooling water roller, and winding the base band which is taken out of the box body and has the temperature close to room temperature into a base band disk.
5. The preparation method of the graphene/polytetrafluoroethylene nanocomposite split fibers according to claim 1, wherein the first heating and stretching is to heat and stretch the dried and degreased base tape in an oven at a temperature of 300-310 ℃, at a base tape feeding speed of 4-6m/min, at an output speed of 18-30m/min, at a stretching ratio of 4.5 times, wherein the stretched strip-shaped graphene/polytetrafluoroethylene film tape is cooled by a cooling roll, wound on a film tape shaft, and relaxed at a temperature of 25-40 ℃ for 1-2hr.
6. The preparation method of the graphene/polytetrafluoroethylene nanocomposite split fibers according to claim 1, wherein the slitting and the second hot stretching are carried out: unreeling a film tape spool obtained after the first heating and stretching, feeding the film tape spool into a slitting device, wherein the cutting device is in a tension state, the tension is controlled at 100-120%, slitting is performed by adopting a coaxial blade, the base tape is slit into flat wires, the linear speed of slitting is controlled at 2.0m/min, the thickness of the blade is 0.12-0.25mm, the slit flat wires are fed into an oven for second heating and stretching, the temperature of the oven is 330-350 ℃, the feeding speed is 2-6m/min, the output speed is 16-50m/min, and the flat wires after heating and stretching are respectively wound.
7. The method for preparing the graphene/polytetrafluoroethylene nanocomposite split fibers according to claim 1, wherein the heat setting twisting is a flat filament obtained by secondary hot stretch winding, and the twisting is carried out after the heat setting; the heat setting temperature is controlled at 330-370 ℃, the setting time is 0.5-1.5min, the finished yarn is twisted by a twisting machine after setting, the twisting direction is S twist, the twist number is 300-800 twist/m, and the feeding speed is 30-40m/min.
8. The method for preparing graphene/polytetrafluoroethylene nanocomposite split fibers according to claim 1, wherein the colored short fibers are prepared by crimping, cutting, opening and then baling colored filaments wound into a roll. The linear speed of the crimper is 5-6m/min, the crimpness is 80-150/m, and the cutting length is 20-38mm.
9. The method for preparing graphene/polytetrafluoroethylene nanocomposite split fibers according to claim 1, wherein the inorganic high-temperature-resistant pigment fine powder is resistant to a high temperature of 350 ℃ or higher, and has a particle size of 25 to 50 μm.
10. The method for preparing graphene/polytetrafluoroethylene nanocomposite split-film fibers according to claim 1, wherein the graphene derivative is graphene oxide, reduced graphene oxide, graphene Nanoplatelets (GNPs), fluorine atom-containing functional group graphene oxide or functionalized graphene.
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