1883results about "Wet spinning methods" patented technology

The invention discloses a preparation method of PEDOT: PSS (poly (3, 4-ethylenedioxythiophene): poly (styrenesulfonate))-based composite fiber with silver nanoparticles loaded on the surface. The method comprises the following steps: uniformly mixing a silver nanowire solution with a PEDOT: PSS solution, or uniformly mixing the silver nanowire solution, the PEDOT: PSS solution and a polymer solution to obtain a spinning solution; extruding the spinning solution into a coagulating bath through a wet spinning process and soaking to obtain nascent composite fibers; and drying the nascent composite fiber to obtain the PEDOT: PSS-based composite fiber of which the surface is loaded with silver nanoparticles and the interior contains silver nanowires. The interior and surface structures of the PEDOT: PSS fiber are simultaneously modified, the interior of the fiber contains a silver nanowire structure, and the surface of the fiber has a silver nanoparticle structure. The composite fiber has the characteristics of ultra-sensitive SERS sensing capability, high conductivity, electric heating, molten drop resistance and antibacterial property.

The invention discloses a hollow aramid aerogel fiber with a hierarchical pore structure as well as a preparation method and application of the hollow aramid aerogel fiber. The preparation method comprises the following steps: by using a coaxial wet spinning method, using a spinning solution A as a shell spinning solution and a spinning solution B as a core spinning solution, simultaneously extruding the spinning solution A and the spinning solution B into a coagulating bath, carrying out in-situ dynamic sol-gel conversion, and then carrying out specific drying to obtain the hollow aramid aerogel fiber with the hierarchical pore structure, the middle of the hollow aramid fiber aerogel fiber with the hierarchical pore structure is of a hollow structure, and the fiber wall is of the hierarchical pore structure. The prepared hollow aramid fiber aerogel fiber with the hierarchical pore structure has the advantages of being large in specific surface area and high in porosity, the inner diameter, the outer diameter and the wall thickness of the fiber and the size, the morphology and the pore size distribution of pores in the fiber wall can be adjusted and controlled, the preparation method has universality, the preparation process is simple, and large-scale production is easy to achieve.

The invention relates to the technical field of aramid fiber production, in particular to a heterocyclic aramid fiber liquid crystal spinning method which comprises the following steps: S1, preparation of heterocyclic aramid polymer powder: carrying out polymerization reaction on a diamine monomer, a third monomer and terephthaloyl chloride in a twin-screw polymerization reactor, after the reaction is finished, neutralizing with an alkaline substance, grinding, washing with water, and drying to obtain heterocyclic aramid polymer powder; s2, preparing the heterocyclic aramid fiber: dissolving the heterocyclic aramid polymer powder with concentrated sulfuric acid, filtering, defoaming to obtain a liquid crystal spinning solution, and performing a dry-jet wet-spinning process, namely spinning, solidifying and forming, washing with water, neutralizing, washing with water, drying and hot drafting to obtain the heterocyclic aramid fiber, a neutralizer used in the neutralization process in the step S2 is a weak base aqueous solution. The heterocyclic aramid fiber obtained by the spinning method has higher mechanical properties, few broken filaments and good flexibility, and can meet the application requirements of aerospace.

The invention belongs to the technical field of fiber materials, and relates to a micro-gear-shaped special-shaped stretchable conductive anti-radiation fiber and preparation and application thereof, a core layer spinning solution and a shell layer spinning solution are subjected to coaxial wet spinning to prepare the micro-gear-shaped special-shaped stretchable conductive anti-radiation fiber; the core layer spinning solution is obtained by dissolving TPU in anti-radiation particles I / anti-radiation particles II / organic solvent dispersion, and the shell layer spinning solution is obtained by dissolving TPU in MXene / organic solvent dispersion; the mass volume ratio of the TPU to the organic solvent in the core layer spinning solution is (2.2-3g): 10ml, and the mass volume ratio of the TPU to the organic solvent in the shell layer spinning solution is (0.5-1g): 10ml; the anti-radiation fiber is of a core-shell structure, the cross section of a core layer is circular, the cross section of a shell layer is of a micro-gear-shaped special-shaped structure, and the average height of gear protrusions is 20-50 m; when being applied, the fabric is processed into a stretchable multifunctional fabric by adopting a weaving process. According to the method, a coaxial wet spinning process is adopted to prepare the product in one step; the product has high sensitivity and a wide sensing range; the application range is wide.

The invention relates to the technical field of hollow gel fibers, in particular to a hollow aramid aerogel fiber and a preparation method thereof. By combining wet spinning with a chemical foaming method, the inner diameter, the outer diameter and the wall thickness of the fiber and the size on a fiber wall hole are regulated and controlled, the hollow aramid aerogel fiber with the high porosity is formed, and the hollow aramid aerogel fiber has high selectivity and high flux, has the properties of flame retardance, heat insulation, high mechanical strength and the like, and is suitable for large-scale production. The use performance and the application range of the aerogel fiber in the prior art are improved and expanded.

The invention discloses a mixed gas-imitating gel fiber as well as a preparation method and application thereof, and belongs to the technical field of fiber materials. The mixed gas-imitating gel fiber is prepared from the following components: cellulose dispersion liquid, a silane coupling agent and viscose in a mass ratio of (1-3): (0.2-0.8): (5-10), comprising the following steps: adding sodium hydroxide into a cellulose dispersion liquid, adjusting the pH value to be alkaline, adding viscose and a silane coupling agent, and carrying out ultrasonic stirring to prepare a mixed spinning solution; the mixed spinning solution is extruded into a coagulating bath through a wet spinning device to be drafted, wet fibers are obtained, and the mixed gas-imitating gel fibers are obtained after freeze drying. The aerogel fiber disclosed by the invention has low heat conductivity coefficient, high mechanical strength and extreme temperature resistance, can solve the problem that the densification and porosity of a traditional fiber structure are difficult to balance, and effectively expands the application prospect of the aerogel fiber in the fields of cold protection, warm keeping and the like.

The invention relates to a preparation method of a coaxial cellulose-based aerogel fiber fabric for daytime radiation refrigeration, which is characterized in that coaxial fibers take pure cellulose as a core, a skin layer comprises hollow silicon dioxide and low-concentration cellulose, and the hollow silicon dioxide is uniformly dispersed in the cellulose; the preparation method comprises the following specific steps: S1, preparing hollow silicon dioxide with an adjustable particle size; s2, preparing a hollow silicon dioxide / cellulose mixed spinning solution; s3, dissolving cellulose; s4, carrying out coaxial wet spinning; s5, carrying out multi-step solvent replacement; s6, performing continuous normal-pressure drying; s7, weaving fibers; the woven aerogel fiber fabric can effectively scatter sunlight, and the solar reflectivity (gt; 92%), and the emissivity (gt; 96%); the preparation method is green and environment-friendly, the operation is simple, the continuous and large-scale production of the cellulose-based aerogel fiber can be realized, and the prepared coaxial aerogel fiber fabric can show excellent radiation refrigeration performance in the daytime.

The invention discloses a heat insulation fabric and a preparation method thereof, and relates to the technical field of fabrics. The thermal insulation fabric is prepared by using a magnetic field to assist wet spinning of the modified silicon dioxide aerogel and the polyamide fiber and then oxidizing the acrylic acid at a high temperature; firstly, nano titanium dioxide is prepared through catalysis of modified polyurethane, the mechanical property of silicon dioxide aerogel is improved, and nano titanium dioxide has an excellent anti-ultraviolet effect and can further improve the heat insulation performance of the fabric; secondly, applying a magnetic field to assist the modified silicon dioxide aerogel and the polyamide fiber in wet spinning, and then decomposing acrylic acid at high temperature; the appearance of the nano titanium dioxide can be adjusted by applying a magnetic field, and the ultraviolet protection effect is improved; after the acrylic acid is decomposed, slender nano grooves and holes are left in the fabric, and the slender nano groove structure can increase the contact area between fibers and increase the heat transfer path, so that the fabric has an ultralow heat conductivity coefficient and achieves the effects of heat insulation and ultraviolet prevention.

The present application belongs to the field of polymer material technology, and in particular, relates to a polyimide composite material, a preparation method thereof, and an application thereof. The preparation method of the polyimide composite material comprises the steps of: preparing a polyamic acid slurry from a diamine monomer, a dianhydride monomer, and an organic solvent; preparing a mixed slurry from the polyamic acid slurry and a nanomaterial, and then performing a spinning imidization treatment to obtain a polyimide composite material; wherein the nanomaterial comprises at least one of nano silicon carbide, aluminum nitride, carbon nanotubes, graphene, and nano silicon dioxide. By blending polyimide with other nanomaterials having high thermal conductivity to improve its thermal conductivity, the thermal conductivity of the polyimide composite material is optimized and improved, and its heat dissipation capacity in a high temperature working environment is enhanced, while having high tensile strength and thermal conductivity. The service life of the polyimide composite material is extended, and its application range can be further expanded, such as in the back panel assembly of a smartphone.

The invention discloses a preparation method of super-drafted carbon fibers, carbon fibers and application, and relates to the technical field of inorganic materials. The method comprises the following steps: preparing a spinning solution containing 10-40wt% of polyacrylonitrile; 2, 4, 6-triaminopyrimidine and barbituric acid are added into the spinning solution, the total amount of 2, 4, 6-triaminopyrimidine and barbituric acid accounts for 1-20 wt% of polyacrylonitrile, and a spinning solution is obtained; carrying out dry spray preforming on the spinning stock solution, then putting the spinning stock solution into a coagulating bath solution at 0-10 DEG C, and carrying out low-temperature coagulating bath treatment at a draw ratio of 1-10 to prepare nascent fibers; and preparing the nascent fiber into a precursor, and preparing the precursor into the carbon fiber through pre-oxidation and carbonization processes. By adding the supramolecular gel accelerator, the spinning stock solution can be rapidly gelated in a coagulating bath, and then high-multiple drafting can be applied to nascent fibers. The internal graphite structure of the carbon fiber prepared by the super-drafting gel spinning technology is perfect, the orientation is good, the defects are reduced, and the fiber strength is improved.

The invention relates to the technical field of aromatic polyamide high polymers, in particular to a modified poly-p-phenylene terephthamide fiber with high elongation at break and a preparation method of the modified poly-p-phenylene terephthamide fiber. According to the invention, a small amount of 3, 4-difluorobenzene is introduced According to the preparation method, the third monomer containing 4, 4 '-diaminodiphenyl ether and the fourth monomer containing a diaminophenoxy functional group are added, and the molar ratio of the third monomer and the fourth monomer in the total amount of the diamine monomer is controlled, so that the rigid molecular chain structure of the conventional para-aramid fiber is destroyed to a certain extent, the breaking strength of the fiber is maintained, the elongation at break of the polymer fiber is enhanced, and the service life of the polymer fiber is prolonged. The prepared modified poly-p-phenylene terephthamide can still adopt a dry-jet wet spinning process, the cost of a new production line of a factory is saved, the fiber with stable elongation at break index is obtained by optimizing process conditions and parameters, and the elongation at break of the prepared fiber is 3.6% or above.

The present invention relates to an electroluminescent fiber and a preparation method thereof. A solvent, a polymer binder and a luminescent powder are mixed, and then stirred to obtain a uniformly dispersed slurry; the conductor and the slurry are coaxially extruded through a porous composite spinneret, and then the slurry and two conductors wrapped therein are solidified and formed in one step through a coagulation bath to obtain a luminescent fiber; wherein each component unit in the porous composite spinneret is composed of a large channel wrapped with two parallel inner channels that can pass the conductors, wherein the two parallel inner channels are used to realize the drawing of the conductors, and the large channel is responsible for extruding the slurry; the luminescent fiber is washed with water to remove the surface coagulation bath liquid, and then dried to obtain the electroluminescent fiber. The method of the present invention can integrate the processes such as coating, molding and collection into a continuous production equipment, and the preparation process is simple and easy to realize industrial mass production. The brightness of the luminescent fiber prepared by this method is 10-100cd / m 2 , capable of lighting up luminous fibers over 100 meters in length.

The invention belongs to the technical field of ultra-high molecular weight material manufacturing, and particularly relates to an ultra-high molecular weight polyethylene fiber recycling spinning method which comprises the following five steps: S1, sorting; s2, dehydrating and degumming; s3, cutting is conducted; s4, dissolving; and S5, spinning. According to the method, the ultra-high molecular weight polyethylene fiber with the physical property equal to that of the protofilament can be recycled, the ultra-high molecular weight polyethylene fiber with the use performance higher than that of the protofilament can be obtained, and the application range of the recycled ultra-high molecular weight polyethylene fiber is effectively widened; the purposes of efficient and environment-friendly regeneration and high-quality recycling of the waste ultra-high molecular weight polyethylene fibers are achieved.

The utility model discloses wet spinning equipment, which relates to the field of spinning equipment, and comprises a coagulating bath tank capable of accommodating spinning to move, a spinning nozzle right opposite to the inner side of the coagulating bath tank, and a first traction roller group arranged outside the coagulating bath tank, and a first guide structure and a second guide structure are arranged on the coagulating bath tank. The first guide structure and the second guide structure are close to the spinning nozzle and the first traction roller set respectively. The first guide structure can effectively prevent the filaments from being detained and accumulated below the spinning nozzle, and continuous ejection of the filaments in the follow-up process is not affected. The second guide structure can enable a moving path of spinning formed in the coagulating bath tank to be inclined upwards smoothly, continuity of the spinning in the moving process is kept, the phenomenon that the spinning is accumulated on the inner side of the coagulating bath tank again after penetrating through the first guide structure is effectively avoided, the spinning can enter the next process quickly, and the spinning quality is improved. And the spinning processing efficiency is improved.

The invention provides a dynamic moisture absorption and sweat releasing fabric for outdoor sports, the fabric is a woven fabric, yarns of the fabric contain temperature-sensitive fibers, the temperature-sensitive fibers are skin-core structure fibers, the cross section of the skin-core structure fibers is a circular cross section, skin-layer fibers in the skin-core structure fibers contain temperature-sensitive expansion phase change microcapsules, and skin-layer fibers in the skin-core structure fibers contain temperature-sensitive expansion phase change microcapsules. And the hardness of the core layer is greater than that of the skin layer. By means of physical changes of heat absorption micro-expansion of the phase change microcapsules, the surfaces of the circular-section fibers protrude, meanwhile, the fabric coverage rate of the fabric is optimized, it is obtained through multiple times of verification that the fabric coverage rate is in the range of 94%-98%, the fabric coverage rate continues to be increased through micro-expansion of the microcapsules, and the fabric coverage rate is increased through the capillary effect. The fibers can quickly absorb moisture and sweat on the skin surface, and the moisture and sweat are diffused and transmitted to the outer layer to achieve the purpose of moisture absorption and sweat releasing.

The present invention relates to a method for manufacturing a nonwoven having nanoporous fibers. The method comprises at least the following steps: - providing (10) a spinning solution having a fiber starting material, in particular a polymer, and having a solvent, - producing (12) raw fibers (20) from the spinning solution, in particular by extruding the spinning solution through capillaries; - accelerating (14) the produced raw fibers (20) by means of an acceleration fluid flow; - depositing (16) the accelerated raw fibers (20) as a moist nonwoven precursor (26) with a fluid; - drying (18) the nonwoven precursor (26) while avoiding a state of the liquid of the moist nonwoven precursor (26) in which the liquid has a capillarity, in order to produce the nonwoven having nanoporous fibers. The invention also relates to a nonwoven and to a manufacturing system

The invention relates to the technical field of spinning, in particular to a spinning method for preparing polyacrylonitrile protofilaments, which comprises the following steps of: spraying polyacrylonitrile stock solution into a solidification pool from a plurality of spinning nozzles on a spinning nozzle for solidification to obtain spinning protofilaments, and collecting contour images of the plurality of spinning protofilaments in the solidification pool; judging whether the spinning precursor has the risk of abnormal spraying form according to the contour image, constructing a spinning unit vector according to the spraying direction of the polyacrylonitrile stock solution, obtaining the environment airflow direction to construct an airflow characterization vector, and determining the type of the abnormal spraying form of the spinning precursor according to the vector included angle between the airflow characterization vector and the spinning unit vector. According to the method, the compensation mode for solidifying the polyacrylonitrile stock solution is selected, and the polyacrylonitrile stock solution is solidified according to the compensation mode to prepare the target spun yarn, so that in the wet spinning process, the compensation mode for solidifying the polyacrylonitrile stock solution is adjusted according to different adaptability of environment airflow, and the target spun yarn is prepared. And the quality uniformity of the polyacrylonitrile precursor is improved.

The invention belongs to the technical field of thermal management materials, and provides aerogel fibers of a three-dimensional porous structure and a preparation method and application of the aerogel fibers. The preparation method comprises the following steps: preparing a polyurethane spinning solution by taking N, N-dimethylformamide as a solvent; then carrying out wet spinning on the polyurethane spinning solution to obtain wet gel state fibers; and immersing the wet gel-state fiber into an organic solvent for solvent exchange, and drying after the solvent exchange is completed to obtain the aerogel fiber. The method is simple, low in cost and low in equipment requirement, efficient and continuous production of the aerogel fibers can be achieved, different spinning solutions can be adopted for preparing the aerogel fibers of different pore structures, meanwhile, the problem that the porous structures of the aerogel fibers are prone to collapsing when the aerogel fibers are dried at normal pressure is solved, and the aerogel fibers are suitable for large-scale production. The aerogel fiber with the three-dimensional porous structure is stable in porous structure, not prone to collapse, excellent in mechanical property and excellent in heat preservation and heat insulation performance.

The invention provides a preparation method of meta-aramid fibrid, which comprises the following steps: a) pre-polymerizing m-phenylenediamine and isophthaloyl dichloride in a reaction kettle to obtain a prepolymer; b) polymerizing, diluting and neutralizing the prepolymer in a twin-screw reactor to obtain a meta-aramid fibrid stock solution; and c) dispersing and forming the meta-aramid fibrid stock solution and a coagulating bath under the action of high shear, and washing the obtained product with water to obtain the meta-aramid fibrid. The invention also provides the meta-aramid fibrid prepared by the method provided by the technical scheme. The meta-aramid fibrid prepared by the method provided by the invention is in a film shape or a fiber strip shape, and has excellent mechanical properties, chemical stability and flame retardance and outstanding high temperature resistance and insulating property. The preparation method of the meta-aramid fibrid, provided by the invention, is simple in process, stable in product performance and suitable for industrial production.

The invention relates to the technical field of textile material and fiber processing, in particular to a high-elasticity moisture-absorption breathable acetate fabric and a preparation method thereof. The invention discloses a high-elasticity moisture-absorption breathable acetate fabric and a preparation method thereof.The acetate fabric takes a bio-based degradable thermoplastic polyester elastomer as an island and acetate as a sea, a homothermal double-hole structure is embedded in the acetate fabric, and the surface of the acetate fabric is covered with a polyglutamic acid and chitosan oligosaccharide self-repairing hydrophilic layer; the preparation method comprises the following steps: pre-burying alkali-resistant microspheres in a marine facies through solid island-solution sea double-path spinning of a bio-based degradable thermoplastic polyester elastomer and acetate, synchronously forming groove-closed pore double channels through simultaneous heating one-step alkali etching-baking, and finally forming a dynamic reversible hydrogen bond network through polyglutamic acid and chitosan oligosaccharide, so as to obtain the marine-based degradable alkali-resistant hydrogel. A bio-based finishing layer with a self-repairing function is obtained, and the finally obtained fabric has the characteristics of high elasticity, breathability, lasting moisture absorption, greenness and degradability.

The present invention belongs to the field of high-performance materials, and discloses a PBO aerogel fiber and a preparation method thereof, comprising the following steps: (1) preparing a polyhydroxyamide (PHA) spinning solution; (2) extruding the PHA spinning solution from a spinneret into a coagulation bath to spin a PHA-PBO wet gel fiber; (3) freeze-drying the PHA-PBO wet gel fiber to obtain a PHA-PBO aerogel fiber; (4) heating the PHA-PBO aerogel fiber to obtain a PBO aerogel fiber. The above method uses a precursor PHA spinning and a volatile solvent to avoid solvent residue inside the fiber; secondly, a partial rigid skeleton structure is constructed in the wet gel fiber to avoid the collapse of the fiber structure during the drying process, so that the final aerogel fiber product has a high porosity, has the advantages of light weight, high strength, and high temperature resistance, and has potential application prospects in the fields of thermal insulation protection, sound absorption and vibration reduction, and catalyst carriers.

The invention discloses a superfine high-strength meta-position aramid fiber and a preparation method thereof, and the superfine high-strength meta-position aramid fiber is obtained by adjusting the type of a wet spinning coagulating bath and reducing the temperature of the coagulating bath to realize super-stretching. Ethyl acetate and dimethylacetamide are used as a coagulating bath, and meanwhile, the temperature of the coagulating bath is reduced, so that the coagulating speed of the fiber in the coagulating bath is slowed down, the intermolecular force of the fiber is stronger, a more stable network gel state is formed, and very excellent stretchability is achieved. The meta-position aramid fiber prepared by the method has the advantages that the diameter is as small as 1.43 mu m, the tensile rate can reach 8000 times, the breaking strength reaches 1332 MPa, and the elongation at break is more than 20%.

The invention relates to the technical field of natural polymer material processing, and discloses a cross-linked composite chitosan solution which is composed of the following components in percentage by mass: 1%-5% of chitosan, 0.1%-5% of a cross-linking agent, 0.1%-5% of acetic acid and the balance of water, and the cross-linked composite chitosan solution is prepared from the following components in percentage by mass: 1%-5% of chitosan, 0.1%-5% of a cross-linking agent, 1%-5% of acetic acid and the balance of water. The cross-linking agent is one or more of glutaraldehyde, citric acid and epoxy chloropropane. According to the cross-linked composite chitosan solution and the preparation method of the chitosan fiber of the cross-linked composite chitosan solution, the adaptability of the cross-linked composite chitosan solution in a human body can be further improved and the immunoreaction can be reduced through a cross-linking reaction, so that the enhancement of the biocompatibility of the cross-linked composite chitosan solution can be ensured; by selecting different cross-linking agents and controlling the cross-linking degree, the biodegradation rate of the chitosan can be adjusted to a certain extent, so that the chitosan is more suitable for specific medical or environmental application requirements, and in addition, the water resistance of the chitosan can be remarkably improved through the cross-linking effect.

The invention discloses a preparation method of a flexible electromagnetic shielding type force sensor based on a coaxial structure, and belongs to the field of flexible electronics and intelligent sensors. According to the method, a coaxial wet spinning process is adopted, a core-sheath structure conductive fiber is constructed, a core layer is made of a multi-walled carbon nanotube (CNT) and thermoplastic polyurethane (TPU) composite material, and a sheath layer is made of a nickel-coated carbon nanotube (Ni-CNT) and TPU composite material. By regulating and controlling the proportion of the core sheath, the construction of the gradient conductive network is realized, and the sensing sensitivity, the electromagnetic shielding performance and the mechanical flexibility are improved. The obtained Ni-CNT-coated CNT fiber is made into fabric and integrated in a sensing glove, and multi-finger bending detection and wireless man-machine interaction control are achieved. The sensor has the advantages of high sensitivity, wide strain detection range and excellent electromagnetic shielding effectiveness, is suitable for the fields of intelligent wearing, anti-interference man-machine interface and fire-fighting equipment, and can also be expanded to complex application scenes such as aerospace teleoperation.

The invention relates to the technical field of preparation of viscose fibers, in particular to a preparation method of viscose fibers based on wormwood essential oil / paraffin double-layer microcapsules, which comprises the following preparation steps: S1, preparing the wormwood essential oil / paraffin double-layer microcapsules; s2, preparing a microcapsule spinning solution; s3, spinning and forming. According to the invention, the wormwood essential oil is coated in the double-layer microcapsule, so that the natural antibacterial property of the wormwood essential oil is fully exerted. Main active components (such as eucalyptol and flavonoid compounds) of the wormwood essential oil are continuously released through a microcapsule slow release mechanism, and growth of common pathogenic bacteria such as escherichia coli and staphylococcus aureus is remarkably inhibited. Meanwhile, due to the double-layer structure (the polyurethane inner shell and the polyurea outer shell) of the microcapsule, volatilization and oxidation of the wormwood essential oil in the spinning process are effectively avoided, and the long-acting antibacterial effect is ensured.

The invention discloses a chitosan polyphenol composite spinning method and application of the chitosan polyphenol composite spinning method in artificial hair, and belongs to the technical field of bio-based spinning. According to the chitosan / punicalagin (CS / PL) colored composite fiber and the preparation method thereof, punicalagin and chitosan are subjected to mixed spinning through a wet spinning method, the chitosan / punicalagin (CS / PL) colored composite fiber is prepared, the degradability, biocompatibility and antibacterial property of chitosan are reserved, the composite fiber can be endowed with natural brown yellow, and the mechanical performance of the fiber is improved. The chitosan / punicalagin composite fiber prepared by the invention has excellent anti-swelling performance, mechanical performance, flexibility and flame retardancy which are obviously superior to those of commercially available artificial hair.

The invention discloses a preparation process of fiber aramid fiber with high electromagnetic shielding performance, which comprises the following steps: step 1, dissolving an aramid fiber polymer in concentrated sulfuric acid to form a spinning solution; step 2, adding a nano conductive material and a magnetic material into the spinning stock solution, and treating the mixed solution by adopting an ultrasonic-high-speed shearing synergistic dispersion technology for 30-60 minutes; step 3, extruding the mixed solution into a coagulating bath through a wet spinning process, and performing multi-stage stretching, washing and drying to obtain nascent fibers; 4, performing high-temperature heat treatment and plasma surface modification on the nascent fiber to enhance the continuity of the conductive network; and step 5, coating the surface of the fiber with a polydopamine-metal composite layer. The invention belongs to the technical field of high-performance fiber preparation, and particularly provides a preparation process of fiber aramid fiber with high electromagnetic shielding performance, which optimizes filler selection, a dispersion process and fiber structure design, is high in electromagnetic shielding effectiveness, is suitable for a lightweight environment, and is high in environmental adaptability.

Recycling wind turbine blades includes shredding, crushing, and milling the wind turbine blades to yield a multiplicity of particles including glass fiber and sieving the particles to yield a multiplicity of pellets including glass fibers. Manufacturing a composite coaxial fiber includes providing a first, second, and third polymer composition to yield a composite coaxial fiber precursor, processing the composite coaxial fiber precursor to yield a coagulated composite coaxial fiber precursor, drawing the coagulated composite coaxial fiber precursor, and heating the drawn coagulated composite coaxial fiber precursor to yield the composite coaxial fiber. The second polymer composition can include the recycled glass fibers. The resulting composite coaxial fiber includes an inner and outer layer including polyacrylonitrile and a middle layer between the inner layer and the outer layer. The middle layer includes polyacrylonitrile and a multiplicity of the recycled glass fibers.

The invention discloses a preparation method of a sodium alginate fiber biological material fiber with a hollow structure and a sodium alginate fiber.The preparation method comprises the following steps that 101, CaCl2 particles are dissolved in deionized water and fully stirred, and a CaCl2 / H2O core layer spinning solution is prepared; step 102, dissolving sodium alginate in deionized water, heating to improve the solubility of the sodium alginate in the deionized water, and fully stirring to obtain an SA / H2O cortex spinning solution; and step 103, respectively extruding the SA / H2O skin layer spinning solution and the CaCl2 / H2O core layer spinning solution into a CaCl2-removed coagulating bath through a coaxial needle at the speeds of 200 [mu] L.min <-1 > and 200 [mu] L.min <-1 >, and aging to obtain the hollow fiber. According to the preparation method, a coaxial spinning process is adopted, and the problems of fluid fracture and the like caused by drafting instability can be effectively avoided. Hollow fibers are used for replacing solid rod-shaped fibers, the process is efficient, convenient, energy-saving and environment-friendly, the experiment repeatability is high, a high-voltage electric field and toxic substances are not involved in the preparation process, and damage to biological tissues is avoided.

The invention discloses a green low-cost sugar-based multifunctional carbon fiber and a preparation method thereof, and belongs to the technical field of carbon fiber preparation. According to the method, water-soluble saccharides, a gel monomer, a reinforcing phase and a spinning auxiliary are used as main raw materials, a carbon fiber precursor containing a multifunctional phase is prepared in situ through wet spinning and drying, and then efficient synthesis of the multifunctional carbon fiber is achieved through pre-carbonization and carbonization treatment. The multifunctional phase introduced into the prepared carbon fiber endows the carbon fiber with excellent properties such as high temperature resistance, oxidation resistance, corrosion resistance, high strength, high conductivity, high heat conductivity and high specific surface area, so that the carbon fiber is expected to be applied to multiple fields such as aerospace, automobile industry, electronic equipment, energy field, constructional engineering, medical equipment and environmental protection.