37results about How to "Good fiber shape" patented technology

The invention discloses an eucalyptus routing fiber board and a manufacturing method thereof. The method uses eucalyptus wane as a main raw material and comprises the following steps: chip preparation, wood chip steaming, fiber preparation, wax applying, glue applying, molding pre-pressing and hot-pressing, and therefore obtaining the routing fiber board. The routing fiber board per cubic meter comprises the following raw materials by weight: 1200kg of wane chips, 4.0-4.5kg of paraffin wax, 205-210kg of an adhesive and 2.0-3.0kg of a steaming auxiliary agent. The method prepares the eucalyptus routing fiber board by using fast-growing eucalyptus wane with the poor quality, solves the problems of deficiency of high-quality wood and high production cost of the routing fiber board, improves the utilization value of the logging residues of fast-growing eucalyptus wane man-made forest, increases the income of farmers and the economic benefit of enterprises, realizes the wish that high-end products are made of low-end raw materials, and has good economic and social benefits.

The invention relates to polylactic acid-polyethylene glycol coated florfenicol nanofiber and a preparation method thereof, belonging to the technical fields of veterinary drugs and preparation thereof. The polylactic acid-polyethylene glycol is segmented copolymer D, L-polylactic acid-polyethylene glycol-D, L-polylactic acid; and florfenicol is filled in a reticular structure of polylactic acid-polyethylene glycol, and mass ratio of the florfenicol to the polylactic acid-polyethylene glycol is 1: (3.5-10). The preparation method comprises the steps of adding the polylactic acid-polyethylene glycol and the florfenicol into an organic solvent, stirring and dissolving to obtain a spinning solution; and then carrying out electrostatic spinning to obtain a polylactic acid-polyethylene glycol coated florfenicol nanofiber membrane. The preparation method provided by the invention realizes drug loading while carrying out electrostatic spinning on the polylactic acid-polyethylene glycol, and solves the problems such as sudden release of drugs, short action time and poor water solubility; and the adopted raw materials cannot cause the problem of environmental protection after degradation, the cost is low, the preparation process is simple and quick, and the polylactic acid-polyethylene glycol coated florfenicol nanofiber and the preparation method are applicable to mass production.

The invention relates to a metal-organic framework fiber membrane for filtering tobacco smoke particles and its application. The metal-organic framework fiber membrane is obtained by completely converting an oxide fiber membrane directly with an organic ligand, and has a super high ratio surface area. The metal-organic framework fiber membrane for filtering tobacco smoke particles of the present invention has excellent filtering performance for tobacco smoke particles, and has excellent filtration performance for PM 10 and PM 2.5 The filtration rates are above 91% and 89% respectively.

The invention relates to a polyethylene glycol-b-poly(L-lactide-co-epsilon-caprolactone) / poly (epsilon-caprolactone)-REDV blended superfine electrospun fiber film and a preparation method thereof. Poly (epsilon-caprolactone) with low molecular weight is coupled with REDV small peptides, poly (epsilon-caprolactone)-g-REDV is prepared, poly (epsilon-caprolactone)-g-REDV and polyethylene glycol-b-poly(L-lactide-co-epsilon-caprolactone) with high molecular weight are together dissolved in a mixed solvent of chloroform and N,N-dimethyl formamide, and an electrostatic spinning method is used for preparation in order to obtain the superfine fiber film. The electrospun fiber film comprises superfine fiber whose diameter is 400-1000nm, and thickness is 50-200[mu]m. The electrospun fiber film contains REDV small peptides on the surface, in order to promote adhesion and growth functions of vascular endothelial cells; at the same time, the superfine fiber film is used for wrapping and loading nucleic acid, protein, medicament and other bioactive substances, and has capability for controlled release of bioactive substances. The product is used for biomedical materials.

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 provides a method for preparing polyvinyl alcohol BiVO4 composite fiber by an electrostatic spinning method. The method comprises the following steps of: firstly adding Bi(NO3)3.5H2O and citric acid monohydrate in deionized water and stirring evenly, and then adding ethanolamine and continuously stirring to be clear so as to obtain a solution A; then adding ammonium metavanadate and the citric acid monohydrate in the deionized water to obtain orange mixed liquid, stirring at the constant temperature of 70 DEG C to enable the color of the mixed liquid to turn into dark blue without precipitation, and obtaining a solution B; mixing the solution B and the solution A, and stirring to obtain a precursor solution; then evenly mixing the precursor solution and a polyvinyl alcohol solution binding agent to prepare an electrostatic spinning solution; and finally putting the electrostatic spinning solution into a syringe to start spinning, and collecting the prepared polyvinyl alcohol BiVO4 composite fiber by a receiver. The preparation method provided by the invention is simple and convenient, low in energy consumption and cost, and environmentally-friendly, the prepared polyvinyl alcohol BiVO4 composite fiber has good dispersibility, and nanofiber with good appearance can be obtained in a high-voltage electric field.

The invention belongs to the technical field of flexible device manufacturing, and relates to a method for manufacturing a flexible stretchable device based on an ordered arrangement torsion structure. The method includes the steps that firstly, a flexible macromolecule substrate is pre-stretched to be fixed to a glass sheet, and electrodes are manufactured at the four edges of the pre-stretched flexible macromolecule substrate; secondly, the flexible macromolecule substrate is placed on an annular metal collector connected with the negative electrode of a power source to serve as a collecting substrate, and a machined hollow stainless steel needle serves as a spinning spraying head; a spinning solution is injected into a spinning solution container for electrospinning; the flexible macromolecule substrate is horizontally rotated by 90 degrees for continuous electrospinning and then taken down from the glass sheet, and the flexible stretchable device based on an ordered arrangement torsion structure is obtained. The method is simple in manufacturing process and convenient to operate; the manufactured flexible stretchable device can be stressed and tensioned in one or two of the two-dimensional directions respectively, pre-strain control over materials in the two directions can be accurately achieved, and the application range is wide.

The invention provides a lithium iron phosphate / iron phosphide / carbon composite nanofiber including the following components by mass percent: 50-99% of lithium iron phosphate, 0.5-30% of iron phosphide and 1-20% carbon. The average diameter of the lithium iron phosphate / iron phosphide / carbon composite nanofiber is 50-500nm and spherical particles of iron phosphide exist in the composite nanofiber. The lithium iron phosphate / iron phosphide / carbon composite nanofiber has good fiber morphology and conductivity and is high in discharge capacity when being used as a positive material of a lithium-ion battery.

The invention discloses a method for preparing activated carbon fibers based on a centrifugal spinning method. The configured polyacrylonitrile-based N,N-dimethylformamide spinning solution is injected into a plane receiving type centrifugal spinning device to prepare a fiber with a finer diameter. And polyacrylonitrile-based micro-nano long fibers with uniform size distribution; then pre-oxidized by segmental heating and heat preservation to obtain polyacrylonitrile-based micro-nano pre-oxidized filaments; then pre-oxidized filaments are initially carbonized at high temperatures, It can not only improve the adsorption rate of the activator during the pre-activation treatment, but also overcome the defect that the micropores collapse due to the severe carbonization process when the pre-oxidized wire is directly activated and carbonized at high temperature; High-temperature carbonization makes the activation process mild, and the micropore diameter and porosity are easy to control. The activated carbon fiber prepared by the invention has the advantages of high specific surface area, high porosity and small pore diameter, and is suitable for large-scale mass production.

The invention discloses a preparation method of an acrylic board veneer protection base paper; the following steps are carried out: taking 3-10 parts of cellulase, 1-8 parts of pectinase and 3-10 parts of xylanase in parts by weight , 0.1-0.8 part of alkanolamide, 0.1-0.6 part of Span-600.1-0.6 part, 75.7-88.8 part of water to prepare composite biological enzyme agent; add 1-5 parts of mixed pulp plate in pulper by weight, add 95- 99 parts of water, then add a compound biological enzyme agent of 100ppm-300ppm relative to the dry pulp weight, decompose for 5-30 minutes, and make a mixed pulp; send the mixed pulp into a refiner for refining, and the beating concentration is 1% ‑4%, refining to a beating degree of 20‑45°SR; the pulp is sequentially diluted, netted, pressed, dried and curled to obtain the finished product. The invention improves the beating degree of the pulp, shortens the refining time, reduces energy consumption, reduces pollution, and improves the specific gravity of the fiber form in the pulp by adding the compound biological enzyme agent with an optimized ratio in the pulping process of the base paper, so that the base paper The volume index of paper has been significantly improved.

The invention discloses a method for preparing PPTA-pulp by ultrasonic induction, and belongs to the field of chemical fiber preparation. The method comprises the following steps: completely dissolving p-phenylenediamine powder into a calcium chloride-contained solvent; then, adding paraphthaloyl chloride at twice, wherein the mass ratio of the paraphthaloyl chloride at twice is (1:9) to (9:1), and the time interval is 2-5 minutes, and starting an ultrasonic device after the paraphthaloyl chloride is added at the second time to obtain a faint yellow PPTA slurry liquid, wherein the ultrasonic frequency is 28-120 kHz, and the condensation polymerization is 0.2-2 hours; diluting the prepared faint yellow PPTA slurry liquid by using N-methyl pyrrolidone, adding the diluted faint yellow PPTA slurry liquid into a solidification liquid composed of the N-methyl pyrrolidone and water with a volume ratio of (2:1) to (4:1), chopping at high speed to form a chopped fiber-shaped pulp fiber, washing and drying after suction filtration to obtain the PPTA-pulp. The prepared PPTA-pulp has good fiber morphology, and high specific surface area; the feather-shaped structure feature of the pulp is obvious; meanwhile, excellent high temperature resistance is achieved.

The invention discloses novel application of melatonin, in particular to application of a melatonin synergistic extracellular matrix biomaterial to preparation of a medicament for promoting osteoblast differentiation of mesenchymal stem cells and application of the melatonin synergistic extracellular matrix biomaterial to preparation of a medicament for treating bone diseases. Proven by experiments, by using the melatonin synergistic extracellular matrix biomaterial system, the in-vitro proliferation of the mesenchymal stem cell can be promoted, a good fibrous shape is kept for the cells, intracellular ROSs (Reactive Oxygen Species) are reduced, the epimatrix calcium deposition is facilitated, the osteogenesis gene expression is enhanced, the promotion of in-vitro osteoblast differentiation by the melatonin synergistic extracellular matrix biomaterial and a mechanism of differentiation are determined, and a basis is laid for the treatment of diseases such as osteoarthritis, bone defect and bone trauma by taking the melatonin synergistic extracellular matrix biomaterial as a repair material.

The invention relates to a polyethylene glycol-b-poly(L-lactide-co-epsilon-caprolactone) / poly epsilon-caprolactone-g-polyethylene glycol-REDV blend ultrafine electrospun fiber membrane and a preparation method. The method comprises the steps that polyethylene glycol-b-poly(L-lactide-co-epsilon-caprolactone) and poly epsilon-caprolactone-g-polyethylene glycol-REDV are together dissolved into a mixed solvent of chloroform and N,N-dimethylformamide according to the volume ratio 4:(1-8):1; electrospinning is conducted on the solution on the conditions that the flow is 0.02-0.10 mL / h, the voltage is 12-20 kV, and the receiving distance is 15-20 cm, and the electrospun ultrafine fiber membrane with the thickness being 50-200 micrometers. The ultrafine fiber membrane surface contains REDV small peptide and is good in promotion of vascular endothelial cell adhesion and growth effect; the membrane is used for encapsulating bioactive substances such as nucleic acid, protein and medicine, has the function of controlling released bioactive substances and is used in the field of biomedical materials.

The invention discloses a method for preparing a biological dressing composite micro-nano fiber membrane. The method can solve the main problems in electrostatic spinning of collagen and chitosan. According to the method, a mixed solution of hexafluoroisopropanol and acetic acid, and an acetic acid water solution serve as a spinning solvent of a high molecular weight I-type collagen and a spinning solvent of the chitosan respectively, and then the toxicity and the cost of the solvent are reduced; a cross-linking agent genipin with excellent biocompatibility is directly added into a spinning solution to allow electrostatic spinning and chemical crosslinking to effectively combine together, so that the secondary biological toxicity due to the conventional crosslinking manner can be avoided; and the prepared collagen / chitosan / polyoxyethylene composite micro-nano fiber membrane is excellent in fiber morphology and biocompatibility, can serve as a biological dressing material, and has the functions of hemostasis, antibiosis, and wound healing.