831results about "Spinning solutions preparation" patented technology

The invention provides research and development of an early warning and self-repairing anticorrosive coating based on nanofibers, and the coating can realize timely self-early warning and self-repairing, so that people can timely discover and maintain a damaged part. A shell solution of the synthesized core-shell nanofiber is mainly prepared from a polymer shell material, a shell material spinning aid and a shell material solvent according to the mass ratio of 1: (01-1): (5-15); the core solution is mainly composed of a core material and a core material solvent, and parameters such as the feeding sequence, the heating temperature range, the stirring speed and the reaction time are optimized. A coaxial spinning mode is adopted in electrostatic spinning, and parameters such as voltage, liquid outflow speed and receiver moving speed in the electrostatic spinning process are optimized. The synthesized fiber structure is complex and interwoven together, so that the internal material has extremely high flowability. The coating is formed by mixing industrial epoxy resin, epoxy resin monomers, a curing agent and a diluent according to the mass ratio of 1: (0.2-1): (0.2-1.5). The coating added with the nanofibers has early warning and self-repairing performance at the same time, early warning of the coating material on corrosion under the coating can be achieved, external intervention is not needed, self-repairing is achieved, and important research significance and application prospects are achieved.

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 present invention relates to an electrospun fiber, a process for preparing the same, a nonwoven fabric comprising the electrospun fiber, as well as corresponding uses and articles. The inventive electrospun fiber comprises a polymer, a surface-reacted calcium carbonate and a pharmaceutically or nutraceutically active ingredient, wherein at least a part of the pharmaceutically or nutraceutically active ingredient is present within the pores of the surface-reacted calcium carbonate. The inventive fibers may be used e.g. in yarns, transdermal patches, intrabuccal patches, implantable textiles, wound dressings and / or medical tapes.

The present invention relates to a flash-spun polyethylene film material with a good toughness and a manufacturing method therefor. The raw materials thereof comprise polyethylene. The gram weight G of the flash-spun polyethylene film material is greater than 50 g / m2; the initial toughness Z0 of the flash-spun polyethylene film material is 20-35 (N·m) / g; and Z0=[RM×EM+RT×ET] / G, wherein RM is the tensile strength in the MD direction, RT is the tensile strength in the TD direction, EM is the tensile elongation in the MD direction, and ET is the tensile elongation in the TD direction. The flash-spun polyethylene film material is exposed in a dry and hot atmosphere at 90ºC for 6 hours, and is then cooled under the conditions of a temperature of 25ºC and a relative humidity of 65% for 24 hours, and the light transmittance thereof is measured to be 8-13%. The testing of the light transmittance is performed according to GBT2410-2008, and the light transmittance is the ratio of the luminous flux of light penetrating a sample to the luminous flux of light emitted onto the sample, and is expressed as a percentage. The flash-spun polyethylene film material of the present application has a relatively good toughness.

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 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 present invention relates to the technical field of flexible electronics, and relates to a breathable and stretchable circuit capable of being activated by imprinting, and a preparation method therefor and a use thereof. The preparation method for the breathable and stretchable circuit capable of being activated by imprinting in the present invention comprises the following steps: dissolving a thermoplastic polymer in a solvent, adding liquid metal particles, and mixing and dispersing to obtain a mixed solution; carrying out electrospinning on the obtained mixed solution to prepare a nanofiber membrane; and using a stamping model having a circuit pattern to stamp the obtained nanofiber membrane so as to obtain the breathable and stretchable circuit capable of being activated by imprinting. The present invention ensures the breathability and the stretchability by using the nanofiber membrane. The liquid metal particles match fibers in diameter, and therefore, liquid metal in nanofibers can be overflowed by means of imprinting to form a conductive path, achieving high-precision preparation of circuits.

The invention discloses a fluoride-free waterproof sound-transmitting film and a preparation method thereof, and the fluoride-free waterproof sound-transmitting film comprises the following components in percentage by mass: 30-40% of a fluoride-free polymer; 4.5%-11.5% of a fluoride-free waterproof agent; 0.5%-3.5% of a cross-linking agent and 45%-65% of a solvent; the solvent is a mixed solvent of N 'N-dimethylformamide, N' N-dimethylacetamide, acetone and ethyl acetate, and the mass ratio of the amide solvent in the mixed solvent is 60%-85%; the preparation method of the fluoride-free waterproof sound-transmitting film comprises the following steps: preparing a spinning solution; carrying out electrostatic spinning by utilizing electrostatic spinning equipment to obtain a continuous and uniform nano spinning membrane; the method comprises the following steps: uniformly depositing nanofibers on a nano spinning film base material, and carrying out post-treatment to obtain a finished product of the fluoride-free waterproof sound-transmitting film, the fluorine-free safe and healthy product with good water resistance and air permeability, high rebound resilience and excellent acoustic performance is successfully prepared through selection of raw materials, preparation of a spinning solution, spinning process parameters and fine regulation and control of post-treatment conditions.

The present invention belongs to the technical field of fiber materials, and relates to a composite fiber containing nano natural tea fibers, and a preparation method and application thereof. The raw materials for preparing the composite fiber include nano natural tea fibers and basic fiber pulp, and the nano natural tea fibers are mate nano fiber microemulsions. The present invention integrates nanotechnology into the preparation of natural tea fibers, and adopts a microemulsion method to simultaneously and evenly disperse a variety of effective ingredients in tea in the mate nano fiber microemulsion, so that the multifunctionality of the fabric can be effectively exerted; the microemulsion system has high uniformity and long-term stability, and during the spinning process, the nano tea fibers can be highly dispersed in the spinning solution without the need for additional surfactants, and the effect of the functional fabric finally obtained can be long-lasting. In addition, mate tea is rich in tea polyphenols and unique yerba mate alkaloids, which can further improve the comprehensive performance of the composite fiber.

An object of the present invention is to provide a polyurethane urea elastic fiber whose physical properties do not change much over time and which retains its initial mechanical properties, and a method for obtaining this fiber by modifying the molecular chain and ends of the polyurethane urea polymer. Another object of the present invention is to provide a polyurethane urea elastic fiber whose use can improve inventory management and fiber processing condition management, and which can be used to obtain a fabric with stable physical properties and qualities, and to provide a method for producing this fiber. The present invention is a polyurethane urea elastic fiber comprising: polyurethane urea polymer A having a molecular chain using a polymer diol, a diisocyanate, and an organic amine as starting materials, and having a primary or secondary amino group on at least one end; and polyurethane urea polymer B using a polymer diol, a diisocyanate, an organic amine, and an organic carboxylic acid as starting materials, and containing an amide bond, wherein the polyurethane urea elastic fiber contains primary or secondary amino end groups in the range of 0.1 meq or more and 20 meq or less per kilogram of polyurethane urea elastic fiber.

The invention relates to the technical field of building materials, in particular to a preparation process of heat-resistant anti-cracking concrete. The preparation process comprises the following steps: preparing a suspension; pVA fibers are prepared and treated; modifying the PVA fiber by using a VAE emulsion; and preparing the concrete. The calcium carbonate whisker and the water reducing agent are used for preparing the suspension liquid, the anatase and the fly ash are used for treating the PVA fiber, the water reducing agent can reduce the water demand of the material and improve the fluidity of slurry, so that the PVA fiber and powder are mixed uniformly, the anatase powder and the fly ash can be uniformly distributed in the slurry and then coat the PVA fiber, and the water-retaining property is improved. The tiny fly ash particles attract each other, so that the treated PVA fibers can be tightly combined with each other, and the compression resistance and cracking resistance of the concrete material are improved.

Provided are compositions and methods related to cellulosic materials combined with protein powder and that are subjected to aging conditions under temperature during a process that includes wet spinning to produce fibers. The method yields mechanically strong fibers.

The present invention provides a preparation method preparation method for three-layer artificial blood vessel and application thereof. The three-layer artificial blood vessel comprise three layers, electrospinning inner layer, dense middle layer and electrospinning outer layer, the three-layer structure is closely combined and difficult to separate. The inner layer with a cytoskeleton-like structure can promote the formation of intima; the dense middle layer can effectively prevent the leakage of biomacromolecules and increase the puncture resistance of the whole artificial blood vessel; and the outer layer can promote the growth of tissue cells and better integrate with tissue. The three-layer artificial blood vessel provided by the invention has excellent blood compatibility, good flexibility, good puncture resistance and interlayer peeling resistance. The preparation method is convenient and is suitable for industrial scale production.

The invention relates to a method for industrially preparing a lyocell fiber spinning solution. The method comprises the following steps: step 1, preparing a first suspension with the cellulose concentration of less than or equal to 6wt%; step 2, increasing the concentration of cellulose in the first suspension to 10-12wt% in a manner of separating part of the solvent under pressure to obtain a second suspension; step 3, crushing and grinding the second suspension to obtain a third suspension; 4, inputting the third suspension into a film evaporator, controlling the temperature in the film evaporator, and dissolving the third suspension under a vacuum condition to obtain a spinning solution with the cellulose concentration of 11-13wt%; the method is a brand new thought for industrially preparing the lyocell fiber spinning solution, the hidden danger that dust is generated in the pulverization process of pulp can be eliminated, more sufficient and uniform swelling and more uniform dissolution can be synchronously achieved, the better dissolution effect is achieved, and the high-quality fiber spinning solution is obtained.

The present invention relates to the field of the preparation of polyurethane elastic fibers, and relates to a preparation method for a bio-based polyurethane elastic fiber, comprising: preparing polyether polyol from sucrose, glycerol, dimethylamine and propylene oxide; adding a solvent, i.e., N,N-dimethylacetamide, and polyether polyol and polyisocyanate into a reaction tank, and adding p-Toluenesulfonyl semicarbazide and aluminum methylenebis(2,4-di-tert-butylphenoxy) phosphate to prepare a spinning solution; and subjecting the spinning solution to spinning and oil application by means of dry spinning technology to obtain the bio-based polyurethane elastic fiber. The present invention ensures that the properties of polyurethane elastic fibers do not deteriorate or are partially enhanced, while the cost and performance advantages are achieved.

This application discloses a method and application of aerogel fiber. The method includes mixing a solvent and a polymer material to form a spinning solution, using airflow spinning technology to drive the spinning solution with a high-speed airflow to form a jet, and forming a gel fiber through sol-gel conversion, and then performing solvent replacement on the gel fiber and drying to prepare aerogel fiber. The method of preparing aerogel fiber by airflow spinning provided by this application does not have high requirements for the gelation process of aerogel material, and if a spinning solution that meets the rheological conditions is obtained, aerogel fiber can be prepared by this method, avoiding the impact of insufficient gelation process on fiber performance, and at the same time improving the production efficiency of aerogel fiber and greatly simplifying the process. The prepared aerogel fiber has a unique porous structure, high specific surface area, high porosity, certain spinnability and excellent skeletal structure stability, and can be applied in fields such as spinning.

The invention relates to the technical field of functional fiber materials, in particular to a fiber material with an antibacterial function and a preparation method thereof, and the preparation method comprises the following steps: S1, preparing composite antibacterial powder; s2, preparing antibacterial functional particles; s3, preparing a spinning solution; s4, performing wet spinning and post-treatment to obtain the fiber material with the antibacterial function. A triple antibacterial system is formed by constructing the ferroferric oxide core body, the zinc oxide middle layer and the chitosan shell and is fused into the fiber preparation process, and the fiber material which is excellent in antibacterial effect, resistant to washing and good in environmental adaptability and has the antibacterial function is obtained.

The invention relates to the field of free radical solution polymerization programmed monomer supplementation, in particular to a polyacrylonitrile spinning solution with an adjustable molecular sequence and a preparation method thereof.The preparation method comprises the steps that polymerization solution formula components and dosage ranges are determined, and the components comprise acrylonitrile, itaconic acid, methyl methacrylate or fumaramide and the like; the thermodynamic reaction temperature ranges from 60 DEG C to 66 DEG C, the total monomer concentration ranges from 18 wt% to 26 wt%, and the initiator concentration ranges from 0.072 wt% to 0.103 wt%. When preparation is started, all components except for partial itaconic acid are added, then itaconic acid is supplemented in batches, and the supplementing time and the proportion range interval can be calculated according to a specific formula. The itaconic acid is supplemented in a manner of body nitrogen blowing or metered addition after dissolution, and the solution concentration is less than or equal to 55wt%. According to the method, the molecular sequence can be accurately regulated and controlled, the homogeneity of the copolymer is improved, heat release in the polymerization process is uniform, a stable environment is provided for industrial production, meanwhile, a reaction system is optimized, and the reaction efficiency and the product yield are improved.

The invention discloses a regenerated cellulose fiber based on gel spinning and a preparation method and application thereof, and belongs to the technical field of bio-based high performance. The preparation method comprises the following steps: activating a cellulose raw material with water / DMAc double solvents, and dissolving the activated cellulose raw material in a LiCl / DMAc system to form a spinning solution with the concentration of 5-15wt%; the solution is extruded out of a methanol coagulating bath with the temperature lower than the spinning solution gel point through a gel spinning technology, and the drafting rate is larger than or equal to 5 times; the nascent fiber is subjected to solvent replacement, washing and drying, and the regenerated cellulose fiber is obtained. The tensile strength of the prepared regenerated cellulose fiber reaches 664 MPa (2.2 times of that of viscose), and the elastic modulus is 41 GPa; the fiber roundness index is 0.80, and the surface smoothness Ra is less than or equal to 0.1 mu m (SEM verification); and the raw material cost is reduced by 30%.

The invention provides a flame-retardant regenerated cellulose fiber for environment-friendly and efficient clothing and a preparation method of the flame-retardant regenerated cellulose fiber, and relates to the field of regenerated cellulose fibers. The preparation method of the flame-retardant regenerated cellulose fiber for the environment-friendly and efficient clothing comprises the following steps: preparing an efficient flame retardant dispersing system, preparing a blended spinning stock solution, spinning and forming, and performing post-treatment. According to the environment-friendly and efficient flame-retardant regenerated cellulose fiber for clothing and the preparation method thereof, the flame-retardant performance of the flame-retardant regenerated cellulose fiber for clothing can be improved, the phosphorus content and the sulfur content of the flame-retardant regenerated cellulose fiber for clothing are reduced, the environment-friendly performance of the flame-retardant regenerated cellulose fiber for clothing is improved, the biological irritation is reduced, and the safety of clothing is improved; the mechanical property, the whiteness and the comfort of the flame-retardant regenerated cellulose fiber for clothing are further improved.

The invention provides a multifunctional aerogel fiber based on a waste firefighter uniform fabric and a preparation method thereof, and belongs to the technical field of textile material recovery. The method comprises the following steps: separating aramid fiber 1313, aramid fiber 1414 and conductive fiber from the waste firefighter uniform; dissolving step by step, and compounding with sulfonated MXene to prepare a spinning solution; forming a gel fiber precursor through wet spinning, and spirally winding and stranding; performing supercritical carbon dioxide treatment to construct a porous structure; and finally coating a functional skin layer. Spiral winding stranding is adopted to replace traditional parallel stranding, interface micro-fusion is generated in combination with supercritical carbon dioxide, and mechanical interlocking and hydrogen bond strengthening between fibers are synchronously achieved; the continuity of the conductive network is enhanced through sulfonated MXene modification, and the solvent system difference is avoided through beam splitting spinning. The prepared aerogel fiber has the characteristics of high strength, high conductivity and high temperature resistance, and solves the problems of poor interface bonding and single function of various fibers in the waste firefighter uniform.

The invention discloses a recombinant protein and application thereof in preparation of sodium alginate fibers. The recombinant protein is obtained by fusion expression of a functional protein and at least one alginic acid binding domain protein. The amino acid sequence of the alginic acid binding domain protein is as shown in at least one of SEQ ID No. 1, SEQ ID No. 2 and SEQ ID No. 3. The recombinant spider silk protein with the alginic acid CBM region can exert the material science characteristics in a sodium alginate-calcium ion system, the mechanical property of alginic acid fiber is greatly enhanced, and meanwhile, the biological activity of protein can be provided for an alginate fiber system.

The invention provides an anti-ionizing radiation fiber with high filling amount, high strength and high elasticity and a preparation method and application thereof, and belongs to the field of functional fiber materials.The preparation method comprises the steps that rare earth nitrate and citric acid are dissolved in an acidic alcohol aqueous solution, heated and stirred, the pH value is adjusted, sol is obtained, the sol is subjected to secondary heating treatment to obtain gel, and the gel is dried to obtain the high-filling-amount high-strength high-elasticity anti-ionizing radiation fiber. Aging, drying, grinding and calcining the gel to obtain rare earth composite powder; wherein the rare earth nitrate is a mixture of gadolinium nitrate, dysprosium nitrate and cerium nitrate; adding polyurethane into a mixed solution of DMF and xylene, stirring, adding the rare earth composite powder, stirring, and defoaming to obtain a spinning solution; preparing nascent fibers from the spinning solution through wet spinning; and drawing, washing and drying to obtain the anti-ionizing radiation fiber. The anti-ionizing radiation fiber prepared by the invention has excellent shielding property, mechanical property and air permeability.

The invention relates to a method for the manufacture of cellulose carbamate textile fibre, comprising the steps of dissolving cellulose carbamate in an aqueous alkaline medium to form a cellulose carbamate dope comprising zinc; spinning the cellulose carbamate dope into an alkaline aqueous spin bath in a spinning unit, to form filaments or filament tow; and stretching the filaments or filament tow to obtain cellulose carbamate fibres. In the spin bath, sodium hydroxide and sodium carbonate contents are maintained within pre-defined ranges by withdrawing and recycling a portion of the spin bath.

The invention relates to the technical field of functional fiber preparation, in particular to a polyurethane / carbon black / Cu composite conductive fiber and a preparation method and application thereof. The preparation method of the polyurethane / carbon black / Cu composite conductive fiber comprises the following steps: mixing flaky copper powder with a conductive fiber spinning solution of polyurethane and carbon black to obtain a polyurethane / carbon black / Cu composite conductive fiber spinning solution; wherein the flaky copper powder accounts for 2.5%-20% of the mass of the polyurethane / carbon black / Cu composite conductive fiber spinning solution; and carrying out wet spinning on the polyurethane / carbon black / Cu composite conductive fiber spinning solution to obtain the polyurethane / carbon black / Cu composite conductive fiber. According to the preparation method, the viscosity of the TPU / CB / Cu composite conductive fiber spinning solution is successfully reduced, the problems that a spinning needle head is blocked and spinning operation is complex are solved, and the conductivity of the TPU / CB / Cu composite conductive fiber is remarkably improved.

The invention discloses a metal ion enhanced antibacterial silk protein fiber and a preparation method thereof, comprising the following steps: S1: degumming silk in an alkaline salt solution, drying naturally and then drying to obtain degummed silk; S2: preparing a dissolving solution containing transition metal ions, calcium ions and an organic solvent, dissolving the degummed silk in the dissolving solution to obtain a spinning solution of a certain concentration; S3: squeezing or sucking the spinning solution into a multi-channel spinning chip through a metering device; S4: squeezing the spinning solution from an extrusion port through the chip into a coagulation bath containing a coagulant and a toughening agent of a certain concentration to form multiple strands of fiber fibrils; S5: after the multiple strands of fiber fibrils are out of the coagulation bath, they are subjected to differential stretching between stretching rollers, and finally a metal ion enhanced antibacterial silk protein fiber is obtained on a collecting roller. According to the invention, not only a high-performance regenerated fiber material is provided, but also an effective way for the resource utilization of waste silk is provided.

The invention discloses a high-voltage output elastic self-crimping spiral fiber and a preparation method and application thereof, and belongs to the technical field of fiber preparation. The preparation method comprises the following steps: dissolving a thermoplastic piezoelectric polymer in a first solvent dissolved with metal salt to prepare a first spinning solution; a high-elasticity polymer is dissolved in a second solvent to prepare a second spinning solution, the second solvent is different from the first solvent, and the high-elasticity polymer is incompatible with the thermoplastic piezoelectric polymer; taking the first spinning solution as a shell layer solution and the second spinning solution as a core layer solution, and carrying out electrostatic spinning by adopting a two-component core-shell electrostatic spinning process. The preparation method is simple, and the prepared fiber has excellent mechanical property and enhanced piezoelectric effect and can be applied to flexible electronic devices and intelligent wearable equipment.

The invention provides an electrostatic spinning solution which is prepared from the following raw materials: LLZTO modified by a silane coupling agent MEMO, PVDF-HFP and a solvent, the mass ratio of the silane coupling agent MEMO modified LLZTO to the PVDF-HFP is (15 to 20): 100. The invention also provides a preparation method of the solid-state electrolyte membrane, the PVDF-HFP matrix and the LLZTO filler in the prepared composite solid-state electrolyte membrane are uniformly dispersed by optimizing a formula of an electrostatic spinning solution, improving a lithium salt introduction mode and adopting a step-by-step drying process and a double-layer glass sheet capping process, so that a continuous and efficient ion transmission channel is formed; meanwhile, the lithium salt is uniformly distributed in the electrolyte membrane, so that the ionic conductivity is remarkably improved, the electrolyte membrane has relatively high compactness and stability and is in good interface contact with an electrode material, the charge-discharge performance of the battery is effectively improved, the cycle life of the battery is effectively prolonged, and powerful support is provided for development of a high-performance solid-state battery.

Heating device (50) in which a heating element (51) comprising a carbonized material (19) formed by carbonizing a silicon-containing vegetable raw material, continuous carbon fibers (63) formed by mixing and spinning the carbonized material with a resin, a carbon fiber bundle (62) formed by combining the carbon fibers into a bundle, and a heating element that receives the carbon fiber bundle (62) in a flexible tube (61) is used, characterized in that a circumference of the heating element is sheathed with a net-shaped electrical conductor (53), the electrical conductor and the carbon fiber bundle are electrically connected to one end of the heating element via a connecting part (57), one circumference of the electrical conductor is additionally encased with a flexible, thermally conductive and insulating outer sheath (56), and a feed-in terminal (52) is provided which supplies current to another end of the heating element.