2020results about "Electroconductive/antistatic filament manufacture" patented technology

The present invention relates to a high modulus macroscopic fiber comprising single-wall carbon nanotubes (SWNT) and an acrylonitrile-containing polymer. In one embodiment, the macroscopic fiber is a drawn fiber having a cross-sectional dimension of at least 1 micron. In another embodiment, the acrylonitrile polymer-SWNT composite fiber is made by dispersing SWNT in a solvent, such as dimethyl formamide or dimethyl acetamide, admixing an acrylonitrile-based polymer to form a generally optically homogeneous polyacrylonitrile polymer-SWNT dope, spinning the dope into a fiber, drawing and drying the fiber. Polyacrylonitrile/SWNT composite macroscopic fibers have substantially higher modulus and reduced shrinkage versus a polymer fiber without SWNT. A polyacrylonitrile/SWNT fiber containing 10 wt % SWNT showed over 100% increase in tensile modulus and significantly reduced thermal shrinkage compared to a control fiber without SWNT. With 10 wt % SWNT, the glass transition temperature of the polymer increased by more than 40° C.

A microwave-induced heating of CNT filled (or coated) polymer composites for enhancing inter-bead diffusive bonding of fused filament fabricated parts. The technique incorporates microwave absorbing nanomaterials (carbon nanotubes (CNTs)) onto the surface or throughout the volume of 3D printer polymer filament to increase the inter-bead bond strength following a post microwave irradiation treatment and/or in-situ focused microwave beam during printing. The overall strength of the final 3D printed part will be dramatically increased and the isotropic mechanical properties of fused filament part will approach or exceed conventionally manufactured counterparts.

Fibers described herein comprise a composition including a polymer and graphene sheets. The fibers can be further formed into yarns, cords, and fabrics. The fibers can be in the form of polyamide, polyester, acrylic, acetate, modacrylic, spandex, lyocell fibers, and the like. Such fibers can take on a variety of forms, including, staple fibers, spun fibers, monofilaments, multifilaments, and the like.

The present invention is directed to a process for printing conductors, insulators, dielectrics, phosphors, emitters, and other elements that may be for electronics and display applications. The present invention also relates to viscoelastic compositions used in this printing process. The present invention further includes devices made therefrom.

The invention relates to polyester conductive fibers and provides graphene conductive polyester fibers having good conductivity and lasting static resistance and a preparation method thereof. Through surface sulfonic acid group functionalization of graphene, graphene particles have sizes less than 1 micrometer and have good dispersibility, graphene, carbon nanotubes and a surfactant are stirred and mixed according to a mass ratio of 1-5: 1-5: 1-5: 1 and then are dispersed to form conducting particles, the conducting particles are added into polyester powder, the mixture is processed to form graphene superconducting masterbatches by a twin-screw granulation technology, and the graphene conductive polyester fibers are prepared by a spinning technology adopting a double-component composite spinning method or a single-component blending spinning method. The graphene conductive polyester fibers have the characteristics of simple production processes, low energy consumption, low labor and mass production feasibility.

The invention relates to a method for producing conducting fiber, which comprises the following steps that: 1, a sea-island type conducting high polymer is prepared by using a high polymer containing conducting powder as an island phase and a high polymer incompatible with the island phase as a sea phase to blend; 2, a composite conducting fiber is prepared by performing bicomponent composite spinning by using the sea-island type conducting high polymer as a component and a linear high polymer compatible with the sea phase in the sea-island type conducting high polymer as another component, wherein the sea-island type conducting high polymer in proportion by weight is between 15 and 30 percent; 3, the content of the conducting powder in the composite fiber in proportion by weight is between 1.5 and 12 percent; and 4, the sea-island type conducting high polymer in the composite form of the bicomponent composite conducting fiber can be used as a cortex component, a core layer component, and the like.

A multi-component conductive yarn which includes a primary component and a secondary component. The primary component consists of at least one elongated filament formed of polymeric material while the secondary component consists of a blend of polymeric material and carbon nanotubes. The secondary component is bonded with the primary component along its length. The carbon nanotubes comprise up to 20% of the secondary component. The conductive yarn comprises no more than 10% carbon nanotubes.

The invention discloses a preparation method of polyacrylonitrile/graphene composite-based carbon fiber, which comprises the following steps: firstly preparing a polyacrylonitrile mixed solution uniformly dispersed with graphene through an in-situ polymerization method, and then employing the mixed solution as a spinning solution and obtaining a polyacrylonitrile/graphene composite protofilament by a wet spinning or dry-jet wet spinning process, and finally making the protofilament subject to a pre-oxidation treatment and a carbonization treatment to obtain the polyacrylonitrile/graphene composite-based carbon fiber. Compared with the existing polyacrylonitrile-based carbon fiber, the carbon fiber prepared by the method of the invention has a significantly increased mechanical property, and the carbonation yield in the preparation process is improved, therefore, the preparation method is an efficient and reliable preparation method with good application prospects.

The invention discloses a preparation method of conductive high-strength graphene-reinforced polymer fiber, which comprises the following steps of: (1) dissolving a graphene oxide raw material in solvent, and carrying out ultrasonic treatment to obtain graphene oxide dispersion; (2) dissolving a polymer in solvent to obtain a polymer solution; and (3) adding the graphene oxide dispersion obtained in the step (1) to the polymer solution obtained in the step (2) under stirring, continuing stirring after complete addition, adding a reducing agent, centrifuging or carrying out rotary evaporation treatment, concentrating, transferring to a spinning device, continuously extruding from a spinning head at uniform speed, forming after entering a solidifying solution, and collecting to a roller to obtain continuous graphene-reinforced polymer fiber. The preparation method is simple and convenient, low in cost and multiple in used polymer variety, and is suitable for large-scale industrialized production; and the produced fiber has excellent mechanical property and better conductivity, and can be used for power transmission, antistatic textile, engineering material engineering material and other fields.

The invention discloses a preparation method of carbon nanotubes/nano ATO (antimony tin oxide)/polypropylene electroconductive fibers. The preparation method comprises the following steps of: (1) mixing nano ATO and carbon nanotubes, placing in an organic solvent together with a dispersant, and carrying out surface treatment to obtain a double-component nano electroconductive agent; (2) mixing the double-component nano electroconductive agent with polypropylene slices, and carrying out melt blending and strip preparation and granulation with a screw extruder to obtain double-component nano electroconductive agent/polypropylene composite electroconductive slices; (3) carrying out melt spinning on the composite electroconductive slices to obtain carbon nanotubes/nano ATO/polypropylene nascent electroconductive fibers; and (4) stretching and shaping the carbon nanotubes/nano ATO/polypropylene nascent electroconductive fibers to obtain the carbon nanotubes/nano ATO/polypropylene electroconductive fibers. By using the preparation method, the filling factor of a filler is increased, the content of an electroconductive filler in the material is reduced, the electric conductivity of the material is improved, and the electric performance stability of the material is simultaneously improved; and the preparation method has low price and no special requirement on equipment, has a economicand simple process route, and is suitable for industrial production.

The invention relates to water-soluble polymer/graphene composite fiber as well as a preparation method and application thereof. The cross section of the fiber is special-shaped, the surface of the fiber is of an orientated micro-fiber-shaped structure, the strength of the fiber is greater than 100 MPa, the elongation at break is greater than 2%, and the conductivity of the fiber is greater than 0.1 S/cm. The preparation method comprises the following steps: preparing a composite spinning liquid, extruding into a coagulating bath for curing, drafting, leading out of the coagulating bath, drying, and coiling, thereby obtaining the water-soluble polymer/graphene composite fiber; and finally reducing by using a chemical or physical method, thereby obtaining the water-soluble polymer/graphene composite fiber. The cross section of the composite fiber provided by the invention is of a special-shaped structure, the surface of the fiber is of a rich groove micro structure, the strength and the toughness of the fiber are greatly improved when being compared with those of pure graphene fiber, and good conductivity is still maintained, so that the water-soluble polymer/graphene composite fiber has a wide application prospect in the fields such as anti-electrostatic and conductive fabrics, electromagnetic wave absorption and shielding fabrics, energy storage devices, sensors and water treatment.

The invention relates to a double-component melt-blown durable electret non-woven fabric and a manufacturing method thereof. The non-woven fabric consists of tourmaline modified polypropylene/polyethylene glycol adipate (tourmaline modified PP/PET) parallel double-component melt-blown nano microfiber; and the fiber has the following components in percentage by mass: 20 to 80 percent of tourmaline modified PP, and 80 to 20 percent of PET. The method for manufacturing the non-woven fabric adopts the components in percentage by mass and the process steps of: (1) performing drying pre-treatment on the PET first; (2) then preparing a double-component melt-blown non-woven fabric by tourmaline modified PP/PET melt-blown composite spinning technology; and (3) finally obtaining the double-component melt-blown durable electret non-woven fabric by performing high-voltage corona discharge electret treatment on the non-woven fabric. The non-woven fabric can be used for durable high-efficiency filtration materials, and can also be applied to thermal insulation materials, antibacterial medical materials, oil absorption materials and the like.

The invention relates to an electret polypropylene melt-spray nonwoven cloth and its making method, the components in weight percent: polypropylene 95-97%, and tourmaline 3-5% with average particle size not greater than 0.5mum; its making method: (1) uniformly mixing and fusing the tourmaline particles and the polypropylene slices to make particles; the assistants of making the tourmaline particles in weight percent: coupling agent 3-10%; dispersant 2-5% and chemical inhibitor 0.01-0.1%; (2) uniformly mixing, fusing and extruding the particles with the polypropylene slices, stretching under the high-speed hot air flow to make the product. The product has better adaptability to high temperature and high humidity environment, can be used in filtering liquid; the making method has the characters of simple technique, no special devices, easy industrialized implementation, etc.

The invention relates to a method for preparing a polyacrylonitrile/carbon nano tube composite material by taking ionic liquid as a solvent. The method comprises the following steps of: dispersing carbon nano tubes to the ionic liquid; adding monomers and an initiator into the ionic liquid for polymerizing to obtain stock solution of the polyacrylonitrile/carbon nano tube composite material; and obtaining the polyacrylonitrile/carbon nano tube composite material by washing and drying the obtained stock solution. The polyacrylonitrile/carbon nano tube composite material is prepared into a polyacrylonitrile/carbon nano tube composite membrane by adopting a coating method or is prepared into polyacrylonitrile/carbon nano tube composite fibers by adopting a wet spinning process or a dry-jet wet spinning process. The adopted solvent ionic liquid can make the carbon nano tubes disperse uniformly, and has no volatility and environmental-friendliness. In the preparation method, an in-site polymerization method is adopted, so the preparation method is simple and convenient to operate. The composite material can be used in the fields such as the enhancement, the conductivity, the anti-static property, the electromagnetic shielding and the like of a material.

The invention relates to a method for preparing graphene/polyimide composite fibers. The method comprises the following steps of: (1) preparing graphene or graphene oxide; (2) preparing a graphene/polyamic acid spinning solution; and (3) preparing graphene/polyimide or graphene oxide/polyimide composite fibers. According to the method, through adopting stripped graphene layers as addition materials of polyimide fibers, the spinnability of the polyamic acid spinning solution is improved, the stability of the polyamic acid fibers is improved, the improvement on the performance of the fibers is facilitated, and thus, the polyimide fibers with excellent performance are prepared; and with the adoption of the method, the problem of difficulty in the spinning and the forming of the polyamic acid fibers is solved, the mechanical properties of the composite fibers is improved, meanwhile, the problems of uneven dispersion and interfacial adhesiveness of the graphene in a matrix polymer are solved.

The invention discloses a graphene fiber and a preparation method thereof, wherein the graphene fiber is a composite fiber obtained by doping graphene fiber with metal nanowires, the composite fiber comprises the main components of graphene and the metal nanowires, wherein the mass ratio of the metal nanowires is 0.1% ~ 50%, the graphene is in lamellar morphology, and the metal nanowires and the graphene layers are parallelly and simultaneously arranged along the axial direction of the graphene fiber. The metal nanowire doped graphene fiber is a new high performance and multifunctional fiber material, by doping of the metal nanowires, fiber conductive rate is greatly improved, meanwhile the graphene fiber exhibits good tensile strength and excellent toughness, has the very strong potential application value in many fields such as use as lightweight flexible wires and the like.

The invention discloses a preparation method for a polymer-grafted graphene laminated fiber with electrical conductivity and high-strength. The preparation method comprises steps as follows: (1) dissolving graphene oxide raw materials into a solvent, and ultrasonically processing to obtain graphene oxide dispersing liquid; 2) dissolving the polymer into the solvent to obtain the polymer solution; 3) slowly adding the graphene oxide dispersing liquid into the polymer solution, and adding a reducing agent to reduce the graphene oxide into graphene; and 4) centrifugally processing to wash away free polymer to obtain polymer-grafted graphene sol, transferring the polymer-grafted graphene sol into a spinning device, continuously extruding the polymer-grafted graphene sol from a spinning head at a constant speed, forming in solidifying liquid, and then collecting the formed polymer-grafted graphene sol on a roller shaft, so as to obtain the continuous polymer-grafted graphene laminated fiber. The preparation method is simple and convenient, low in cost, rich in variety of used polymers, and suitable for massive industrial production; the produced fiber is excellent in mechanical performance, and higher in conductivity; and the produced fiber can be applied to fields of power transmission, anti-static textile, engineering material, etc.

An apparatus and method are provided for simply estimating joint channel and Direction-of-Arrival (DOA) to efficiently estimate a channel impulse response associated with a spatially selective transmission channel occurring in a mobile radio channel, and performing efficient beam forming using the simplified joint channel and DOA estimation are provided. A receiver estimates the total interference power using power for each interference signal, estimates a spectral noise density, calculates steering vectors considering predetermined DOAs, and jointly calculates optimal weight vectors for each DOA of each user by applying the interference power and the spectral noise density to the steering vectors. The beam forming reduces implementation complexity of a TDD system such as a TD-SCDMA and increases beam forming efficiency in a mobile environment by efficiently using spatial diversity.

The invention discloses a preparation method of carbon-based nanoparticle/sodium alginate composite fibers. The method comprises the steps of firstly, preparing a sodium alginate water solution with a certain concentration; then, feeding graphene oxide into the solution, fully mixing, and carrying out ultrasonic dispersion to obtain a graphene oxide/sodium alginate water solution; feeding a certain quantity of carbon nano tubes into the solution, fully mixing, and carrying out the ultrasonic dispersion to obtain a carbon nano tube/graphene oxide/sodium alginate spinning solution with the good dispersion; filtering the spinning solution, defoaming, and carrying out solution spinning at the room temperature to prepare the carbon-based nanoparticle/sodium alginate composite fibers. According to the carbon-based nanoparticle/sodium alginate composite fibers prepared by adopting the method, the uniform dispersion and the formation of a network structure of carbon-based nanoparticles in the fibers can be realized, the effective orientation of the carbon-based nanoparticles in the fibers can be realized, and the tensile strength, the electrical conductivity and the degradability resistance of the fibers are improved; furthermore, the adsorbability of the fibers is effectively improved, so that the carbon-based nanoparticle/sodium alginate composite fibers can be used for absorbing heavy metal ions and dye in water solutions.

The invention relates to a nano conductive polymer/graphene composite fiber, and a preparation method and application thereof. The section of the fiber is special; a graphene sheet is at a loose stacking state; enriched fold morphology is formed on the surface of the fiber; the average strength of the fiber is greater than 50 MPa; the average breaking elongation is greater than 2 percent; the average conductivity is greater than 1 S/cm. The method comprises the following steps: preparing conductive polymer/graphene oxide composite spinning solution; then extruding the solution into a coagulating bath and performing elongation and curing, and performing drying and winding on the obtained wet fiber, so as to obtain conductive polymer/graphene oxide composite fiber; finally performing reduction through a chemical or physical method so as to obtain the nano conductive polymer/graphene composite fiber. The nano conductive polymer/graphene composite fiber has the advantages that an adjustable special section structure is formed on the section of the composite fiber, rich microstructures are formed on the surface of the composite fiber, the problem that graphene sheet layers are closely stacked is overcome, the graphene fiber with pure toughness is greatly enhanced, and excellent conductivity of the graphene fiber is still kept, so that the composite fiber has a wide application prospect.

The present invention discloses a polymer composite function fibers containing partial graphene, and a preparation method thereof. The fibers comprise a component A and a component B, wherein the component A and the component B are combined in a partial exposing manner, side-by-side manner or skin-core manner, and 20-100% of the outer area of each fiber is the component B. The method comprises: crystallizing a polyester containing 0.1-1 wt% of partial reducing graphene and a polyester containing 4-20 wt% of a nanometer composite filler containing partial reducing graphene and TiO2, drying, carrying out melt composite spinning, and carrying out drawing and relaxation heat setting at a temperature of 80-160 DEG C, and reducing the partial graphene in the fibers to achieve the carbon/oxygen atom ratio of 9/1-15/1 through the reducing treatment. According to the present invention, the prepared fibers can be produced at the high spinning speed, and the production efficiency is high; and the fibers have characteristics of low single fineness, high strength and lower resistivity, meets the antistatic requirement, and further has characteristics of anti-bacterial property and flame retardant property so as to provide good application prospects.