213 results about "Fiber morphology" patented technology

The invention relates to lithium ferric manganese phosphate as a cathode material of a novel nanometer fibrous lithium ion battery. The lithium ferric manganese phosphate is prepared according to the following steps that iron source compounds, manganese source compounds, phosphorus source compounds, lithium source compounds and macromolecular polymers are used as raw materials, the manganese source compounds easily eroded by electrolyte are dispersed in core layer solution, the more stable iron source compounds are dispersed in case layer solution, and an electrostatic spinning method is adopted. The method for preparing composite materials has the advantages that on one hand, a voltage platform of lithium ion positive electrode materials can be improved, and the specific capacity density and the specific power density of the materials can be greatly improved; and on the other hand, because manganese elements are wrapped in a material core layer, the defects that in the existing preparation technology of the cathode material of the manganese-element-containing lithium ion battery, manganese elements are easily dissolved by electrolyte, the structure is not stable enough, the collapse is easily caused, and the volume attenuation is caused are overcome, and meanwhile, because of the nanometer fiber morphology character, the specific capacity and specific power density and the multiplying power circulation performance of the materials are greatly improved.

The invention discloses a method for preparing reconstituted tobacco paper base made from tobacco stems, wherein the reconstituted tobacco paper base is prepared through taking the tobacco stems as a raw material and adopting a papermaking method and the preparing method comprises the steps of impregnation, defibrination, pulping, sheet making and drying of the tobacco stems. According to the invention, a technical scheme capable of optimizing the comprehensive property of the reconstituted tobacco paper base made from the tobacco stems is provided, which comprises treatment conditions of key processes of the impregnation, the defibrination, the pulping and the like; and a technical mean capable of improving the fiber morphology of the tobacco stems and the physical property of paper pulp is obtained. Showed by results, contents of water-soluble sugar, total plant alkaloid, chlorine and total nitrogen in the tobacco stems are decreased to varying degrees and the holocellulose content is relatively increased by 12.4% after the impregnation and extraction in the technical scheme provided by the invention are adopted; the fiber length of the obtained tobacco stem pulp is longest and the bulk of the finished paper is highest through selecting different types of refining plates and different defibrination gaps; and the tensile index, the tear index, the bulk, the air permeability and the burst index of a paper base product are appropriate and the good quality of reconstituted tobacco is guaranteed through combining the design of the beating degree of the tobacco stem pulp and the technical condition of the sheet making.

The invention discloses a preparation method of lignin nano-carbon fibers for a supercapacitor. Lignin which is extensive in sources, regenerative, high in carbon content and low in price is used as acarbon source, and a polymer which has high molecular weight is used as a spin finish aid. Nano initially spun fibers are prepared by an electrospinning technology, and are subjected to processes ofpre-oxidation, carbonization and the like to obtain nano-carbon fibers. The obtained carbon fibers can form a film directly, and the film can be directly tailored into an electrode of a capacitor. Themethod has the advantages of simplicity in process, high maneuverability, extensive sources, low price and the like. The obtained nano-carbon fibers are continuous fibers, the fiber morphology is good, and the capacitance characteristics are good.

The invention provides a preparation method of a constant-hydrophilic graft-modified chlorinated polymer micro/nano fiber film, and relates to electric-spinning preparation and surface modification of the chlorinated polymer micro/nano fiber film. According to the method for preparing the chlorinated polymer micro/nano fiber film through electrospinning and surface graft polymerization hydrophilic modification, the problems that pressure drop is large, flux is small and the film is prone to contamination during a water system is treated through hydrophobic film material can be solved on the basis of less damages to the film structure. The method includes performing mild dehydrochlorination on chlorinated polymer resin during reflux under the condition of alkaline catalysis, preparing spinning solution, utilizing a self-made electrospinning device, adjusting spinning process parameters, obtaining the micro/nano fiber film with uniform fiber morphology and good mechanical property, then performing surface modification by the method of hydrophilic monomer surface grafting polymerization initiated by azodiisobutyronitrile, and obtaining the chlorinated polymer micro/nano fiber film with high hydrophilicity. The film can be applied to efficient frame-type filtering films.

The present invention relates to a preparation method for CaSi2O2N2:Eu<2+> fluorescence nano-fiber. The method comprises the following steps: (1) dissolving calcium nitrate and europium nitrate in a mixed solvent comprising alcohol and water; adding tetraethyl orthosilicate while stirring; adding polyvinylpyrrolidone after stirring; continuously stirring to obtain a spinning liquid; (2) pouring the spinning liquid into a syringe, carrying out electrostatic spinning to collect a layer of uniform white fiber on receiving aluminum foil; (3) placing the white fiber into a high-temperature tubularatmosphere furnace to carry out a heat treatment; finally carrying out cooling along with the furnace to obtain the CaSi2O2N2:Eu<2+> fluorescence nano-fiber. The method of the present invention has characteristics of simpleness, low nitridation temperature and short time. The prepared CaSi2O2N2:Eu<2+> phosphor has good fiber morphology so as to contribute to improvement of the luminescent property and the later package in the LED, and has a good application prospect.

The invention discloses a preparation method of an aerogel based on a double network structure design. The method comprises the steps that a sodium alginate is added by a one-step or two-step method by radical polymerization to form a gel solution of a polyacrylamide chemical cross-linking network interpenetrating sodium alginate structure, gel is extruded into a coagulation bath to form microspheres or fiber and other forms, at the same time, calcium alginate ion cross-linking is formed through ion exchange, and finally a double-network structure hydrogel interlocking chemical cross-linking and ion cross-linking is formed. After washing with water and freeze-drying, finally an aerogel is obtained. The aerogel exhibits a microscopic multi-layered pore structure with large pore nested mesopores and micropores. According to the preparation method of the aerogel based on the double network structure design, the sodium alginate and acrylamide are utilized to prepare the composite aerogel,the application of an aerogel material in actual production is expanded, and moreover theerogel material has outstanding characteristics of economy, environmental protection, biocompatibility, degradation and the like compared with other aerogel materials, not only can be processed into microspheres, massive structure, but also can directly be processed into fiber morphology.

A process for treating a cellulosic material comprising pretreating the cellulosic material and then extracting the cellulosic material with an extractant to selectively extract hemicellulose therefrom and separating the extracted hemicellulose to form a cellulosic product comprising less hemicellulose than the cellulosic material. The extractant comprises a cellulose solvent and a co-solvent. The cellulosic product advantageously retains its cellulosic fiber morphology. The processes involve separating and recovering the hemicellulose and separating and recycling various process streams employed in the process.

The invention discloses a soft measurement method for the beating degree of the papermaking process based on a gradient enhanced regression tree. The method comprises the following steps of S1, collecting fiber morphology data of an original slurry and initial pulping degree data, collecting the refining process data, and conducting data processing; S2, based on the principle of gradient enhancedregression tree, establishing a soft measurement model of the beating degree; S3, using a cross-validation method according to the training data set, and training the soft measurement model of the beating degree; S4, adjusting the parameters of the soft measurement model of the beating degree according to the training data set; S5, using the aforementioned training and the adjusted model to conduct the soft measurement of the beating degree on a sample to be tested; the method is based on the gradient enhanced regression tree, the soft measurement model of the beating degree is established, the model is convenient and highly precise, and the method has strong generalization ability and good prospects for popularization and application.

The invention relates to a polyvinyl alcohol/collagen/quaternized chitosan electrostatic spinning composite fiber film and a preparation method thereof, belonging to the field of medical devices. Preparation method: first, by adjusting the mass ratio and concentration of polyvinyl alcohol and collagen, evaluate the morphology of spinning fibers, determine the optimal ratio of polyvinyl alcohol and collagen 80:20, and the optimal concentration of 8%; then, add When the concentration of quaternized chitosan was 5%, the polyvinyl alcohol/collagen/quaternized chitosan electrospun composite fiber membrane was prepared by electrospinning technology. The composite fiber membrane of the present invention is easy to prepare, has good flexibility and mechanical properties, can quickly stop bleeding, and can form a layer of protective fiber mat on the surface of the wound to promote wound repair and prevent bacterial infection, thereby healing skin damage. Hemostasis, antibacterial and anti-inflammatory, wound repair and other functions are very suitable as materials for hemostasis, wound repair, and medical equipment, and have a good application prospect.

The invention provides a device for generating micro/nano-fibers with controllable waveforms. The device comprises a precision injection pump, a precision injection pump feed mechanism guide rail, an injector push rod, an injector, an electrostatic spinning sprayer, auxiliary electrodes, a controllable power supply, a motion platform, a collector, a high-voltage direct-current power supply, a control system and a power lead screw, wherein the injector is installed on the precision injection pump, the precision injection pump controls the feed rate of a solution inside the injector through an injector push mechanism, the electrostatic spinning sprayer is installed at the tail end of the injector and used for forming an electrostatic spinning environment, the collector is installed on the motion platform and used for collecting fibers and providing a spinning environment, and the motion platform is used for providing the motion speed and direction of a collecting board in a near field direct writing mode. According to the device, electric fields between the two auxiliary electrodes change, the stress of jet flow in air also changes in the spinning process, so that the deposited track of the jet flow also changes, and the shape and the size of the deposited fibers can be controlled by controlling output signals of the controllable power supply.

A process for treating a cellulosic material comprising extracting the cellulosic material with an extractant to selectively extract hemicellulose therefrom and separating the extracted hemicellulose to form a cellulosic product comprising less hemicellulose than the cellulosic material. The extractant comprises a cellulose solvent and a co-solvent. The cellulosic product advantageously retains its cellulosic fiber morphology. The processes involve separating and recovering the hemicellulose and separating and recycling various process streams employed in the process.

The invention discloses a PHBV (Poly (HydroxyButyrate-hydroxyValerate)) nano fiber support material, a preparation method and application thereof. The preparation method comprises the following steps of: (1) dissolving PHBV powder with the molecular weight of 3*105 in an organic solvent to compound a solution with the concentration of 7.5%, and then stirring for 3-5 hours in a water bath at 50 DEG C by using magnetic force; (2) after fully dissolving the PHBV, hermetically placing the solution; (3) after the solution fully forms hydrogel, taking the hydrogel out, adding acetone for replacing the organic solvent, and then replacing the acetone by using deionized water; and (4) and freezing and drying the PHBV hydrogel to obtain the PHBV nano fiber support material. The PHBV nano fiber support material has the advantages of low cost, simple preparation process, good biocompatibility, high porosity and controllable support structure and fiber morphology; and because the morphological structure of the PHBV nano fiber support material is similar to that of an extracellular matrix in cartilaginous tissue cells of a human body, the PHBV nano fiber support material can promote the adhesion, the propagation and the differentiation of cartilaginous cells and is very suitable for restoring and reconstructing cartilaginous tissues.

The invention discloses a self-reinforced bionic material, comprising a reinforced phase prepared from a biodegradable polymer A with high molecular weight and high crystallinity, and a matrix resin phase prepared from a biodegradable polymer B with molecular weight and crystallinity lower than those of the biodegradable polymer A; the reinforced phase and the matrix resin phase are stacked by a guide die; and the stacking percentage of the reinforced phase is 30-90%, and the stacking percentage of the matrix resin phase is 5-60%. The invention also provides a manufacturing method of the self-reinforced bionic material. The invention employs ultrasonic transient heating and interface mechanism with controllable strength to solve a problem for keeping melting fiber morphology when the difference of melting temperature between matrix and the reinforced phase is small; and fiber distribution gradient is constructed to prepare a biodegradable self-reinforced biomimetic material with bamboo imitation structure, high strength and high toughness.

A method for treating a cellulosic material comprises extracting the cellulosic material with an extractant to selectively extract hemicellulose therein and separating the extracted hemicellulose to form a cellulosic product comprising less hemicellulose than the cellulose-containing material. The extractant comprises an ionic liquid and a non-solvent comprising acetic acid. The cellulosic product retains the cellulosic fiber morphology.

A method for treating a cellulosic material comprising extracting the cellulosic material with an extractant to selectively extract hemicellulose therein and separating the extracted hemicellulose to form a cellulosic product comprising less hemicellulose than the cellulosic material. The extractant comprises an amine oxide and a non-solvent. The cellulosic product retains the cellulosic fiber morphology.

The invention relates to a method for preparing a NiO fiber material for NOX detection. The material is characterized by being prepared from NiO with the nano fiber morphology. The method specifically comprises the following steps: dissolving soluble nickel salt in a proper amount of solvent, stirring to dissolve the nickel salt at the room temperature, adding PVP into a solution, thereby obtaining a precursor solution; putting the precursor solution into electrostatic spinning equipment, performing electrostatic spinning, calcining PVP composite nano fiber, and naturally cooling to be the room temperature, thereby obtaining the NiO nano fiber material after calcining. The material is low in cost and easy in preparation and has good response property to NOX gas concentration change.

The invention discloses a preparation method of tobacco sheet paper base by cabo. The tobacco sheet paper base is prepapred by taking the cabo as raw material and adopting a paper making method. The preparation method comprises the steps of dipping the cabo, grinding, beating, making sheet and drying the cabo. The beating concentration is 10%, the gap between a beating roller and a beating room is 0.2mm, and the beating pressure is 3.33N/mm; and the beating revolution is 1500-2500, and the bearing degree is 20-30 degrees SR. According to the preparation method, the optimal process condition of the beating steps is determined, the technical scheme for the comprehensive performances that the tobacco sheet paper base is prepared by utilizing the cabo again is optimized, the proper design and technical conditions of the beating degree of the cabo is determined, the excellent fiber shape and the excellent physical performance of pulp are obtained, the tensile indexes, tearing indexes, bulk, air permeability and burst indexes of the paper base product are proper, and the good quality of the tobacco which is prepared again can be ensured.

The invention relates to a technical field of melt-blown fabric production, and more specifically, discloses a hydrophobic melt-blown fabric preparation method. The hydrophobic melt-blown fabric preparation method comprises the following steps: step 1, stock solution adding: adding raw material solution, and spraying out the raw material solution; step 2, drafting: drafting the raw material solution with high temperature to form a superfine fiber; step 3, cooling: adhering the superfine fiber sprayed out through own adhesive action, making the superfine fiber sprayed out form a melt-blown fabric through a cooling air flow; step 4, transporting: transporting the melt-blown fabric to next work station; step 5, angle adjustment: adjusting angle of the high temperature air flow, and obtainingthe melt-blown fabric with good fiber morphology. In the hydrophobic melt-blown fabric preparation method above, a hydrophobic melt-blown fabric preparation apparatus is also related; the hydrophobicmelt-blown fabric preparation apparatus comprises a melt-blown die head component, an extrusion discharging apparatus, a high temperature air flow generator component, an angle adjustment apparatus, acooling air flow generator and a receiving apparatus, wherein the belt-blown die head component is arranged on the receiving apparatus.

The invention relates to a preparation method and application of a bionic multi-component fiber. The bionic multi-component fiber comprises an outer shell layer and a multi-inner-core layer. The outershell layer is composed of a biological material excellent in mechanical performance. The multi-inner-core layer is composed of a biological material excellent in electrical performance, so that thetensile property and electrical property of the bionic multi-component fiber are guaranteed; the tensile property and electrical property of the bionic multi-component fiber are precisely adjusted bycontrolling the number of inner cores and the thickness proportion of a shell and the inner cores; and the shell and the multi-inner-core layer are prepared through a multi-component microfluidic technology. The multi-component fiber has good mechanical performance and electrical performance, and the preparation method for microfluidic spinning has the advantages of being low in cost, convenient to assemble and control, safe, reliable and capable of precisely controlling the fiber morphology. The application of the prepared bionic multi-component fiber on the aspect of flexible electronics isprovided, the bionic multi-component fiber has good electrical performance, shows good flexibility and cyclicity, and is high in applicability.

The present invention relates to a method for the continuous production of low thermal conductivity endless filament yarns with a compact, homogeneous structural morphology. The presently disclosed methods utilize safe and recyclable ionic liquids (IL) to produce carbon fiber precursors from cellulose. The fibers are produced by the carbonization of cellulose carbon fiber precursors. The precursor fiber filaments have an increased tear resistance with simultaneously sufficient elongation, a round or crenulated cross-section, and homogeneous fiber morphology. The filament yarns exhibit performance characteristics similar to those produced from traditional viscous rayon. The resulting fibers are especially suited for aerospace applications in composite materials used at the limits of high temperatures, for instance in structures found in rocket nozzles or atmospheric reentry heat shields on spacecraft.