40results about How to "Fine fiber diameter" patented technology

The invention aims to provide polytetrafluoroethylene chopped fiber with high intensity, high uniformity and low production cost and preparation technology thereof. A process flow comprises the following steps of: mixing polytetrafluoroethylene micro powder and a lubricating agent; stirring; standing; performing pre-compression molding; performing push molding; performing rolling molding; drying; performing hot stretching; parting off; twisting; performing primary hot drawing; performing secondary hot drawing; curling and thermally forming; cutting off; loosening; and inspecting and packaging so as to obtain high-intensity polytetrafluoroethylene chopped fiber. In a manufacturing process, the temperature rises gradually from the primary hot stretching to the secondary hot stretching to the curling and thermally forming.

The invention provides a high-content sodium alginate nanofiber membrane and an electrostatic spinning manufacturing method thereof. The material is formed by sodium alginate or sodium alginate and polyvinyl alcohol, wherein the absolute content of the sodium alginate is 42.5 wt% to 100 wt%, and average diameter of the fiber is 100 nm to 150 nm. A solvent used in a preparation process of an electrostatic spinning solution is deionized water, and a surfactant is TX-100 which is certificated by US Food and Drug Administration. The manufacturing method is simple and feasible, and the high-content sodium alginate nanofiber membrane is not added with any hazardous substance. The manufactured sodium alginate nanofiber membrane is characterized by high content of sodium alginate, thin average diameter, and high porosity. The sodium alginate nanofiber membrane can be applied in the fields of wound dressing and tissue engineering (for example, a support material), etc.

The invention provides a manufacture method of a biodegradable non-woven material, which is characterized in that the method comprises the following steps: slicing and drying polyethylene succinate-co-p-benzene dicarboxylic acid butanediol ester; heating and fusing polymer slices in a screw rod extruding press; extruding fused mass from spinneret holes of a mold head; using high-pressure air flow for spraying and blowing at both sides of the spinneret holes when the fused mass is extruded from the spinneret holes of the mold head; tensioning the fused mass into superfine fiber; receiving the superfine fiber through a receiving roller; and forming a biodegradable PBST fused spraying non-woven material through the self adhesive effect of the superfine fiber. The non-woven material manufactured by the method of the invention has good thermodynamic performance, fine fiber diameter, good ventilation performance, soft hand feeling and the like, and also has excellent biodegrading capability. The product can be used in the fields of filtering materials, sanitation materials, package materials and the like, and belongs to a product with good development prospects and high added value.

A porous body that contains cellulose nanofibers having very thin fiber diameters and high hydrophilicity, and has a large specific surface area, and to provide a method of producing the porous body simply with low cost. A method of producing a porous cellulose comprises a process of lyophilizing a mixed liquid containing cellulose nanofibers and a dispersion medium, wherein the dispersion medium is a mixed dispersion medium of water and an organic solvent dissolving in water, a concentration of the organic solvent in the mixed dispersion medium is 2 to 40 mass %, and a solid content concentration of the cellulose nanofibers in the mixed liquid is 0.001 to 5 mass %.

The invention provides a preparation method for a fluoride-free waterproof and moisture permeable fibrous membrane with a photocatalytic self-cleaning function. The preparation method is characterizedby comprising the steps that step 1, an electrospun fiber membrane is prepared, wherein a hydrophilic polymer which cannot be dissolved in water is dissolved in a solvent to prepare an electrostaticspinning solution, and a fiber membrane base material is prepared through electrostatic spinning; step 2, the fiber membrane base material is dipped in an environmental-friendly fluoride-free waterproof agent solution or emulsion at the indoor temperature, then pre-dried and baked; step 3, nano-particles with the photocatalytic performance are utilized for conducting coating finish on the obtainedelectrospun fiber membrane, the obtained electrospun fiber membrane is subjected to high-temperature drying, and the fluoride-free waterproof and moisture permeable fibrous membrane with the photocatalytic self-cleaning function is obtained. The water resistance pressure of the prepared environmental-friendly fluoride-free waterproof and moisture permeable fibrous membrane is greater than or equal to 100 kPa, the water vapor transmission amount of the prepared environmental-friendly fluoride-free waterproof and moisture permeable fibrous membrane is greater than or equal to 15,000 g/m<2>/d, the strength of the prepared environmental-friendly fluoride-free waterproof and moisture permeable fibrous membrane is greater than or equal to 30 Mpa, and the fluoride-free waterproof and moisture permeable fibrous membrane can effectively degrade organic pollutants adhering to the surface of the fluoride-free waterproof and moisture permeable fibrous membrane.

The invention relates to a preparation method for an integral polyacrylonitrile carbon fiber electrode for desalination, belonging to the technical field of novel carbon material preparation and water treatment. The method is based on an electrostatic spinning technique. Polyacrylonitrile is electro-spun into a film and then preoxidation, carbonization and activation are conducted. The prepared carbon fiber material has the characteristics of good macro integrity, small fiber diameter, large mass specific capacitance, high desalination capacity and the like. When electro-adsorption treatment is conducted to NaCl solution with initial concentration being 70mg/l under 1.6V direct-current voltage, the adsorption capacity of the carbon fiber electrode reaches 4.64mgNaCl/g and therefore a strong desalination capacity is reflected. The novel carbon fiber electrode can be widely used in fields such as bitter saline water and seawater desalination, water softening, heavy metal ion removal andthe like.

Fibrous nonwoven mats comprising polyetherimid fibers and a binder comprising a resin and an adhesion promoter, and method of making the mat are disclosed. These mats have several uses and are particularly suited as facer mats for fiber reinforced thermoplastic thermoformable materials. When used as a facer, the mat bonds to the thermoformable material and provides a resin rich outer layer and facilitates bonding to a decorative cover.

The invention relates to a spray non-woven spinning device and a spray non-woven spinning method for producing micro-nanofibers. The spray non-woven spinning method comprises the following steps: firstly, making up polymer solution; setting a frequency parameter of alternating jet flow; injecting the solution into a solution storage chamber; turning on an airflow inlet unit; then, turning on a polymer solution inlet unit; extruding solution trickles from spinning orifices; congealing the sprayed solution trickles to a spinning receiving net forming device under the tensile impact of the alternating jet flow generated by an alternating jet flow generation unit to form a fiber net. Compared with the prior art, the spray non-woven spinning device achieves the goal that final fibers are further refined through the resonance action generated by the alternating jet flow, therefore the fibers are thinner in diameter, and the fiber net is better in evenness; the spray non-woven spinning device has another characteristic of being more energy-saving and environmental friendly, and the operation is convenient.

The invention provides non-woven fabric. The non-woven fabric is prepared from the following components: 60-80 parts of polylactic acid, 20-30 parts of polyurethane, 10-20 parts of polyimide, 30-45 parts of chitosan, 5-10 parts of a flow modifier, 1-3 parts of alkyl sodium solfonate serving as an anti-static agent, 2-4 parts of epsilon-polylysine serving as an antibacterial agent and 3-6 parts of decabromodiphenyl serving as a flame retardant. The non-woven fabric is prepared with an electrostatic spinning method; four easy-to-degrade raw materials including polylactic acid, polyurethane, polyimide and chitosan are used for preparing a spinning solution, and the prepared non-woven fabric is bio-degradable and very environment-friendly; additionally, the non-woven fabric integrates functions of an antibacterial property, radiation protection, water repellency, static resistance and the like, can basically meet various medical demands and has a wide application range.

The invention provides superfine elastic non-woven fabric prepared based on a plane-receiving centrifugal spinning device and a preparation method thereof.The preparation method is characterized in that polyurethane particles are dissolved in N,N-dimethylformamide to prepare a spinning solution, and then the spinning solution is injected into the plane-receiving centrifugal spinning device to perform centrifugal spinning.By reasonably setting the spinning parameters of centrifugal spinning, the spinning process is guaranteed to be smoothly carried out; the fiber diameter of the prepared superfine elastic non-woven fabric can reach 2.1+/-1.1 mum; the arrangement is dense; the tensile strength can reach 18.59+/-5.59 MPa; the elongation at break can reach 450+/-20%; the method provided by theinvention is simple in operation process, suitable for large-scale mass production, and high in production efficiency.

The invention discloses a melt-blown oil-absorbing material, which is characterized in that the melt-blown fiber body includes two thermoplastic polymers, polystyrene and polypropylene, and the mass percentage of polystyrene and polypropylene is: polypropylene 70%~ 95%, polystyrene 5% to 30%. The melt-blown oil-absorbing material of the present invention has the characteristics of fine fiber diameter, fluffy structure, high porosity, and low density, and the crystallinity of the fiber is low, which greatly improves the oil absorption ratio and oil absorption rate of the product. The melt-blown oil-absorbing material of the present invention The oil absorption rate can be as high as 15.8g/g, and the absorption saturation can be reached within 4 minutes.

The invention discloses a double-layer composite drug-loading adhering patch and a preparation method and application thereof and belongs to the technical field of biological medical materials. The preparation method includes: mixing a burst-release drug with high polymer, mixing a sustained-release drug with high polymer, using electrostatic spinning equipment to prepare a burst-release drug layer and a sustained-release drug layer, and compositing the burst-release drug layer and the sustained-release drug layer with an adhering film to obtain the double-layer composite drug-loading adheringpatch. When the double-layer composite drug-loading adhering patch is used, the burst-release drug layer and the sustained-release drug layer can load different types of drugs to form gradient release so as to achieve an optimal curative effect. The double-layer composite drug-loading adhering patch has the advantages that a nanofiber membrane serving as the carrier is high in specific surface area, high in porosity, moisture-permeable and air-permeable, low in fiber diameter, capable of increasing drug loading quantity and the like, the high porosity is beneficial to cell growth and proliferation and can promote the fast healing of wounds, the moisture and air permeability can simulate the natural environment of a mucous membrane or the skin and is beneficial to the neogenesis cell growth of the wounds, and the low fiber diameter can provide more growth loci for the cells and can accelerate wound healing.

The invention discloses antibacterial handmade washing soap. The soap comprises nanometer titania, negative ion antibacterial agent, molecular sieve, grease, surface active agent, sodium hydroxide andwater. The invention further provides a preparing method of the antibacterial handmade washing soap. The method includes the following steps of evenly mixing sodium hydroxide and water, adding the grease to be saponified to prepare a saponification solution, adding the surface active agent to the saponification solution to be evenly mixed, adding nanometer titania, the negative ion antibacterialagent and the molecular sieve to be evenly mixed, adding the mixture into a mold to be standing and be solidified at the room temperature, conducting demolding, and placing the soap in a ventilating and dry place to be aired to prepare the antibacterial handmade washing soap. The prepared handmade washing soap is excellent in antibacterial and decontamination effect and simple in preparation process.

The invention discloses a double-layer nanofiber membrane composite drug-carrying adhesive patch and a preparation method thereof and belongs to the technical field of medical and biomedical materials. A burst release medicament layer, a slow release medicament layer and an adhesive film of the nanofiber membrane structure are compounded, the burst release medicament layer and the slow release medicament layer can load different types of medicaments, reasonable distribution is carried out according to wound conditions, gradient release is formed, and the optimal treatment effect is achieved. The nanofiber membrane serving as a carrier has the advantages of being high in specific surface area, high in porosity, moisture-permeable, breathable, fine in fiber diameter and the like, can increase the loading amount of drugs, is high in porosity and beneficial to growth and proliferation of cells, promotes rapid healing of a wound surface, can simulate the natural environment of mucosa or skin through moisture-permeable, is beneficial to growth of new cells of the wound surface, can provide more growth sites for the cells through fine fiber diameter and can accelerate wound surface repair.

The invention discloses a photocatalytic nano composite material as well as a preparation method and application thereof. The preparation method of the photocatalytic nano composite material comprisesthe following steps of: sequentially adding reduced graphene oxide, bacterial cellulose and a nano titanium oxide precursor into a mixed solution of a cosurfactant and a surfactant, mixing, adjustingthe pH value of the system to 7-9, and reacting to obtain the photocatalytic nano composite material BC-TiO2-RGO. The efficient photocatalytic nano composite material prepared by the invention has excellent photocatalytic performance and photocatalytic stability, has ideal photocatalytic degradability on printing and dyeing wastewater, is high in degradation efficiency and relatively high in reutilization degree and recovery rate, and has an ideal effect and does not affect the recycling of printing and dyeing wastewater when being used for treating printing and dyeing wastewater.