1365results about "Synthetic polymer filament chemical after-treatment" patented technology

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.

Catalytically activated carbon fibers and methods for their preparation are described. The activated carbon fibers are engineered to have a controlled porosity distribution that is readily optimized for specific applications using metal-containing nanoparticles as activation catalysts. The activated carbon fibers may be used in all manner of devices that contain carbon materials, including but not limited to various electrochemical devices (e.g., capacitors, batteries, fuel cells, and the like), hydrogen storage devices, filtration devices, catalytic substrates, and the like.

Disclosed is a process for preparing a fibrous web. The fibrous web includes a microencapsulated material, such as a microencapsulated phase change material, adhered to the web. Preferably, the web is prepared in a melt-blowing or spun-bonding process. In the melt-blowing process, cooling water containing the microcapsules is used to cool melt blown fibers prior to collection on a collector. In the spun-bonding process, microcapsules are applied in liquid suspension or in dry form to a heated web, for instance, after the web has been calendared. The fibrous webs thus prepared have numerous uses, and are particularly suited to the manufacture of clothing.

The invention relates to polyester DTY fiber and a preparation method thereof. The preparation method comprises: metering a modified polyester melt, extruding, cooling, oiling, and winding to preparethe polyester POY fiber. According to the present invention, during the cooling, the longitudinal height is maintained, and the cross section area of the slow cooling chamber is increased while the plate surface temperature of the spinning plate is maintained by using the thermal insulation method; the material of the fiber is the modified polyester, the molecular chain of the modified polyester comprises a terephthalic acid chain segment, an ethylene glycol chain segment and a diol chain segment having the branched chain, the structure formula of the diol chain segment having the branched chain is defined in the specification, R1 and R2 are respectively and independently selected from straight chain alkylidene with a carbon atom number of 1-3, R3 is selected from alkyl with a carbon atomnumber of 1-5, and R4 is selected from alkyl with a carbon atom number of 2-5; the chromatic aberration [delta]E of the prepared fiber is less than 0.200; and the preparation process is simple and reasonable, and the obtained fiber has excellent performance.

A versatile binder comprising at least one or more sulfopolyesters is provided. These sulfopolyester binders can enhance the dry tensile strength, wet tensile strength, tear force, and burst strength of the nonwoven articles in which they are incorporated. Additionally, the water permeability of these binders can be modified as desired by blending different types of sulfopolyesters to produce the binder. Therefore, the binder can be used in a wide array of nonwoven end products and can be modified accordingly based on the desired properties sought in the nonwoven products.

The invention discloses a method for preparing polyacrylonitrile carbon fiber protofilament by dry and wet methods. The method comprises the steps of polymerization, demonomerization and defoaming, filtration, coagulation, washing and drafting, oiling densification, steam drafting, heat setting and drying. Three-level coagulating baths at the temperature of between 10 DEG C below zero and 70 DEG C and with dimethyl sulfoxide with concentration of 10 to 60 mass percent are adopted in the coagulation step, and the first coagulating bath contains aqueous ammonia accounting for 0.05 to 1 percent of the mass of the first coagulating bath; and a spinning head is subjected to 1.5 to 5 times positive drafting in the first coagulating bath, and the drafting is 0 in the second and third coagulatingbathes. According to the method for preparing the polyacrylonitrile carbon fiber protofilament, the spinning process is stable, the broken filament is little, the spinning speed is high, the spinningis stable, the prepared protofilament has few defects, the density is not less than 1.180g/cm<3>, and the tensile strength is not less than 7cN/dtex. The protofilament can be prepared into a high-performance carbon fiber with tensile strength of more than 4.9GPa and elastic modulus of between 260 and 280GPa by high-temperature carbonization.

The invention discloses a silicon-carbon composite material with nano micropores and a preparation method as well as application thereof. The material comprises nano-silicon (Si) particles and a carbon nanofiber matrix, wherein the nano-silicon particles are dispersed in the carbon nanofiber matrix; and nano pores and micropores communicated with the nano pores are distributed in the carbon nanofiber matrix. The method comprises the steps of dissolving the nano-Si particles and polyacrylonitrile (PAN) in a solvent to prepare a mixed spinning solution, then carrying out electrostatic spinning on the mixed spinning solution, and curing spinning trickles in a coagulating bath to obtain a porous PAN-Si composite nanofiber; and then carrying out oxidation and carbonization treatment in sequence to obtain the silicon-carbon composite material with a nano micropore structure. The silicon-carbon composite material is applied to preparation of lithium ion battery cathode materials. Compared with the prior art, the silicon-carbon composite material ensures the overall electron transport capacity of the material while reserving buffer space for expansion of the nano-Si particles.

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.

By using an oil agent for precursor fiber of carbon fiber containing a base compound and a liquid fine particle, and said liquid fine particle contains a liquid of which kinematic viscosity at 150 DEG C is 15000 cSt or more, it is possible to suppress an uneven stabilization in stabilizing process, and it becomes possible to provide a carbon fiber of high performance and uniform quality.

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.

Described are conjugated polymer fibers and nanofibers, methods of making, and methods of use thereof. The conjugated polymer fibers and nanofibers can be prepared by an electrostatic spinning process followed by crosslinking.

The invention discloses a mesoporous silicon oxide particle/degradable polymer nano composite fiber, a preparation method and application thereof. The method comprises the following steps of: uniformly dispersing mesoporous silicon oxide particles into a solution of degradable polymers; and then preparing nano composite fibers by adopting an electrostatic spinning process, wherein the mesoporous silicon oxide particles are uniformly distributed in the degradable polymer fibers. Compared with traditional polymer fibers, the nano composite fiber can be used for better controlling the release ofdrugs and has quicker biodegradability and higher mechanical strength, and meanwhile, the fiber has better cellular compatibility. The nano composite fiber can be used as a tissue engineering support, a drug release vector, a wound coating material or a functional membrane.

The invention discloses a preparation method of a polyacrylonitrile/polyaniline compound micro-nano conductive fiber. The preparation method comprises the following steps of: (1) dissolving polyacrylonitrile and polyethylene glycol into dimethylformamide; standing, de-foaming, and spinning a polyacrylonitrile/polyethylene glycol micro-nano fiber in an electrostatic spinning device; (2) placing the polyacrylonitrile/polyethylene glycol micro-nano fiber into water of 40-90 DEG C for 10-60 minutes to obtain a polyacrylonitrile porous micro-nano fiber; and (3) adding an aniline monomer into hydrochloric acid; uniformly agitating and immersing the polyacrylonitrile porous micro-nano fiber in the solution; and adding hydrochloric acid dissolved with ammonium persulfate to react for 0.5-3 hours to obtain the polyacrylonitrile/polyaniline compound micro-nano conductive fiber. The polyethylene glycol used in the preparation method disclosed by the invention is a water-soluble polymer which has a wide application range, has no pollution to an environment, and is cheap and easy to obtain, environment-friendly and low in cost.

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.

The invention belongs to the technical field of high polymer material, relating to a method for preparing nanofiber containing a polymer pore structure, wherein the pore structure is formed on the fiber by a chemical reaction foaming method. The method comprises the following steps of: dispersing the inorganic salt, capable of discharging gas by reaction, in polymer solution, preparing super fine nanofiber by a high pressure static spinning method, immerging the obtained fiber in reaction solution, reacting the inorganic salt in the fiber, discharging the gas, and forming the pore structure on the fiber. The method has the advantages of obtaining the pore structure-containing nanofiber with controllable aperture number and uniform distribution, greatly increasing the specific surface area of the nanofiber and widening the application range of the nanofiber prepared by the electric spinning method. The prepared fiber has high application value in releasing medicine, carrier of catalyst, filtering absorbing material and the like. The method of the invention is wide in application range and can be directly applied to preparing the pore structure-containing nanofiber of a plurality of materials such as PS (polystyrene), PMMA (polymethyl methacrylate), PU (polyurethane), etc.

The invention provides a polyimide fiber comprising a polymer with a structure shown in a formula (I) in the specification, wherein m is the proportion of a repeat unit with a structure shown in a formula (II), in the structure of the polymer, and is more than and equal to 0.8 and less than and equal to 0.95. The invention also provides a preparation method of the polyimide fiber, comprising the following steps of: mixing p-phenylenediamine, 4,4'-diaminodiphenyl ether and 3,3',4,4-biphenyltetracarboxylic dianhydride in an organic solvent to carry out condensation polymerization so as to obtain a polyamic acid spinning solution, wherein proportion of the mole number of the p-phenylenediamine to the total mole number of the p-phenylenediamine and the 4,4'-diaminodiphenyl ether is 0.8-0.95; spinning to obtain polyamic acid protofilaments by using the polyamic acid spinning solution; carrying out imidization processing on the polyamic acid protofilaments to obtain polyimide nascent fibers; and carrying out hot stretching processing on the polyimide nascent fibers to obtain the polyimide fiber.

The invention relates to a super-soft superfine polyester fiber and a preparation method thereof. The super-soft superfine polyester fiber is mainly prepared by the steps of melt spinning of polyester through spinneret holes, application of an oiling agent and high-speed winding, wherein the oiling agent at least comprises fluorine-containing polyether, the mass of which is more than or equal to 45% of that of the oiling agent, the fluorine-containing polyether is a random copolymer of ethylene oxide, [(1,1,2,2-tetrafluoroethoxy) methyl] oxirane and propylene oxide, and the structural formula of the random copolymer is shown in the specification. The preparation method comprises the steps of metering, extruding, cooling, oiling, stretching, heat setting and high-speed winding of polyester, thereby obtaining the super-soft superfine polyester fiber. As the filament fineness of the super-soft superfine polyester fiber is very high, a fabric has advantages of specially soft and fine hand feeling, soft luster, comfortableness, breathability and good appearance texture and is easy to care, thus being popular with users more and more.

A versatile binder comprising at least one or more sulfopolyesters is provided. These sulfopolyester binders can enhance the dry tensile strength, wet tensile strength, tear force, and burst strength of the nonwoven articles in which they are incorporated. Additionally, the water permeability of these binders can be modified as desired by blending different types of sulfopolyesters to produce the binder. Therefore, the binder can be used in a wide array of nonwoven end products and can be modified accordingly based on the desired properties sought in the nonwoven products.

The invention discloses a polyvinylidene-fluoride hollow fibre membrane and a preparation method thereof. Calculated according to parts by weight, the polyvinylidene-fluoride hollow fibre membrane is mainly prepared by the following components: 15 to 25 parts of polyvinylidene fluoride, 50 to 80 parts of solvent, 1 to 3 parts of surfactant, 2 to 12 parts of polymeric additive, 1 to 8 parts of inorganic additive and 1 to 12 parts of modified blend. By utilizing the simultaneous action of two modes of organic blending and inorganic adding according to the polyvinylidene-fluoride hollow fibre membrane and the preparation method thereof, the hydrophilcity of the polyvinylidene-fluoride hollow fibre membrane is obviously improved, and the pollution resistance can be obviously reinforced; and the pure water flux of the polyvinylidene-fluoride hollow fibre membrane is further enhanced by selecting and regulating the raw materials and the mixture ratio of the modified blend and the inorganic additive so as to obtain the permanently hydrophilic modified polyvinylidene-fluoride hollow fibre membrane.

The invention relates to a method of preparing rubber nanometer fibers. The method adopts a coaxial electrostatic spinning method which uses a rubber as a sandwich layer solution and a water-soluble polymer solution as a casing solution, exerts high-pressure static electricity and then carries out coaxial electrostatic spinning. The preparation method is simple, has good spinning continuity and stability and stable figures of the prepared rubber fibers and is widely applicable to the fields of biomedicine, antibacterium, sterilization, toughened plastics, and the like.

The invention discloses a flame-retardant antibacterial artificial wig hairline, which comprises, by weight, 80-90% of a polyester material, 5-11% of a flame retardant agent, 2.5-6% of an antibacterial agent, 0.3-3% of a dispersing agent, 0.2-0.5% of an antioxidant, and 2-5% of color masterbatch. According to the present invention, the flame-retardant antibacterial artificial wig hairline has characteristics of high simulation degree, flexible hairline, diverse color, flame retardant property, antibacterial property, no fused drop, environmental protection and the like, and can replace the expensive human hairline. The invention further discloses a manufacturing method of the flame-retardant antibacterial artificial wig hairline, wherein the manufacturing method comprises: pre-treating a polyester raw material, carrying out blending granulation on the polyester material, the antibacterial agent, the flame retardant agent, the dispersing agent and the stabilizer by using a double-screw extruder to obtain a flame-retardant antibacterial slice, carrying out melt spinning on the slice, carrying out high-temperature shaping treatment, carrying out washing and drying, and carrying out other steps.

The embodiment of the invention provides a graphene composite fiber. The graphene composite fiber comprises graphene sheets and a polymer for polymerizing the graphene sheets together, wherein the polymer comprises one or both of hyperbranched polymer and polyvinyl alcohol, the graphene sheets and the polymer form a mutually piled stratified structure and the graphene sheets are regularly arranged along the axial direction of the graphene composite fiber. In the preparation method of the graphene composite fiber, graphene oxide is used as a raw material, so that the tensile strength of the graphene composite fiber is improved greatly; due to the addition of the polymer, the composite fiber can achieve better flexibility; because a rotary coagulator is used in the spinning process, the drawing force of the gel fiber is increased, so that the gel fiber has high orientation and regularity, and the strength of the obtained solid fiber is improved greatly; the conductivity of graphene is restored well in the final reduction process.