127results about "Spinning solution filtering" patented technology

The invention discloses a method and equipment preparing viscose filament non-woven fabric through wet spinning technology; the method comprises the following steps: 1, spinning technology, spinning dope preparation; 2, spinning soup solidification reaction; 3, viscose formation; 4, washing; 5, drying: non-woven fabric formation technology; 6, lapping: uniformly scattering and lapping dried primary viscose fiber beams on a lapper web curtain, thus forming intersecting stacked filament fiber web; 7, spunlace reinforcement; 8, baking; 9, winding. The equipment comprises a wet spinning device and a non-woven fabric forming device; related steps in a conventional wet spinning technology can be omitted; semi-finish viscose filament can be directly used for non-woven fabric production; in the prior art, finished fiber filaments are secondarily used for non-woven fabric production; the novel method can break the conventional concept, can effectively save production cost, can reduce environment pollution in the production process, and can improve production efficiency.

The invention discloses a metal organic framework based on alginic acid electrospun fibers and a preparation method thereof. The preparation method comprises the following steps: (1) electrospinning abase nanofiber membrane, namely taking a sodium alginate/polyethylene oxide nanofiber membrane obtained by adopting an electrospinning method as the base nanofiber membrane; and (2) growing MOFs crystals. The preparation method disclosed by the invention has the advantages that no high pressure or high temperature is required in a preparation process, preparation conditions are mild, production cost and potential safety hazard can be effectively reduced, the obtained metal organic framework is uniform in appearance and ordered in configuration, and yield is high, so that the preparation method disclosed by the invention is applicable to large-scale production and has a good application prospect.

A polyimide fiber with kidney-shaped section and a preparation method thereof belong to the technical field of polyimide fibers. The preparation method includes: utilizing polyamide acid (PAA) solution synthesized by aromatic dianhydride and aromatic diamine to perform the wet spinning process by the aid of circular spinneret holes, adjusting spinning conditions including spinneret speed, composition, proportion and temperature of coagulating bath, the length of hydrazine and the like to obtain a PAA as-formed fiber with kidney-shaped section, then washing and drying the PAA as-formed fiber, cyclizing and drafting the same at high temperature stage by stage, and winding and the like, finally obtaining the polyimide (PI) fiber with the kidney-shaped section. The preparation method of the polyimide fiber with the kidney-shaped section has the advantages of simplicity in spinneret hole design and processing, easiness in control of spinning process, high preparation efficiency, low cost for raw materials, low energy consumption and the like and can be used for large-scale industrialized production.

A degassing device for high-viscosity pure-chitosan spinning solutions having a reaction vessel and stirring device. A feed port and vacuum port are disposed at the upper part of the reaction vessel, an inner cylinder body is fixedly disposed in the center position of the reaction vessel which also has a discharge port, the upper cylinder opening of the inner cylinder body is closed and the lower cylinder opening is open, an umbrella-shaped dispersion plate is fixedly disposed at the periphery of the upper half part of the inner cylinder body, a gap is formed between the outer edge of the umbrella-shaped dispersion plate and the inner wall of the reaction vessel, and small liquid outlet holes are distributed on the part of the inner cylinder body above the umbrella-shaped dispersion plate. The stirring device has a stirring shaft with screw propeller and stirring power unit. The upper end of the stirring shaft is mounted to the stirring power unit, the stirring shaft passes through a mechanical sealing device and enters the reaction vessel with the lower end fixed on a seat-mounted bearing, the stirring shaft is superposed with the axial line of the inner cylinder body, and a gap is formed between the inner wall of the inner cylinder body and screw propeller.

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.

The invention belongs to the technical field of functional membrane materials, and particularly relates to a preparation method of a solution spray type thermosetting electrospun composite membrane. Apolymer, inorganic nanoparticles and an organic solvent are prepared into a spinning solution, and the membrane is formed by electrostatic spraying. By changing the proportion of the polymer to the solvent and the proportion of the inorganic nanoparticles to the polymer, the temperature of a receiving panel is adjusted so as to control the solid-liquid phase separation speed of membrane materials, and the regulation and control over the microstructure of the composite membrane are achieved. In the electrospinning process, the composite fibrous membrane can be directly woven; a mesh membrane is formed through melting-collapse and re-jointing of the fibrous membrane; or the membrane materials are sprayed out in the form of droplets to form the membrane, and the above two or three forms canbe combined. According to the prepared composite membrane, different polymers and inorganic nanoparticles can be replaced, and the prepared composite membrane has the advantages that the nanoparticlesare uniformly distributed, the specific surface area is large and the porosity is high; moreover, the prepared composite membrane has adsorption capacity and has a good application prospect in gas filtration and water treatment.

The invention relates to antibacterial and antistatic garment fabric and belongs to the technical field of garment fabric. The antibacterial and antistatic garment fabric comprises the following components including, by weight, 15-25 parts of chitin fiber, 18-22 parts of chitosan fiber, 35-45 parts of tea fiber, 20-25 parts of folium isatidis viscose, 30-40 parts of modified polyamide 6 fiber and120-160 parts of antibacterial agents. According to the antibacterial and antistatic garment fabric, the effect of improving the antibacterial and antistatic performance of the garment fabric is achieved.

A baffle plate type spandex defoaming apparatus comprises an upper sealing head, a cylinder body and a lower sealing head, wherein teh upper sealing head is equipped with a feeding component; the baffle plate type spandex defoaming apparatus is characterized in that more than two baffle plates are disposed in the cylinder body; one end of each baffle plate is provided with a connection end and connected with the inner wall of the cylinder body; the other end of each baffle plate is provided with an opening end and inclines toward the lower part of the cylinder body; and each two adjacent baffle plates incline toward opposite directions.

A combined degassing method for a high-viscosity pure-chitosan spinning solution, including: step 1, thoroughly dissolving the spinning solution in a dissolution vessel for subsequent use, the viscosity reaching 450,000-500,000 mpa·s; step 2, delivering the spinning solution in step 1 to the feed port of a degassing vessel from the dissolution vessel after filtration; step 3, in the degassing vessel, under the conditions of vacuumizing and maintaining the inner pressure of the degassing vessel to be 500-3,000 Pa, performing continuous treatment by a combined degassing process integrating separation, film-scraping, lifting and shear; and step 4, sampling at a sampling port for the detection of degassing degree, finishing the degassing operation if the detection result is eligible, otherwise repeating step (3) until the detection result is eligible. This method has high degassing efficiency and good degassing effect, and is applicable to spinning solutions of a wide range of viscosity.

The invention relates to a system and a method for reducing carbon fiber spinning stoste bubbles, and belongs to the field of methods for treating carbon fiber spinning stoste. The system comprises a demonomerisation and defoaming tower and a spinning unit, wherein the demonomerisation and defoaming tower comprises a secondary demonomerisation and defoaming tower and a tertiary demonomerisation and defoaming tower; a buffering tank is arranged between the secondary demonomerisation and defoaming tower and the tertiary demonomerisation and defoaming tower; the spinning unit is arranged behind the tertiary demonomerisation and defoaming tower; spinning stoste enters the buffering tank after being defoamed by the secondary demonomerisation and defoaming tower, and an initiator in the spinning stoste is decomposed in the buffering tank; the obtained spinning stoste enters the tertiary demonomerisation and defoaming tower for treatment. According to the method, the buffering tank is additionally arranged between the secondary demonomerisation process and the tertiary demonomerisation process, so that the initiator can be fully decomposed, and then the spinning stoste is defoamed through the tertiary demonomerisation and defoaming tower. After the method is used, the quantity of broken silks from a spinning nozzle is obviously reduced, and the tensile strength of raw silks is also enhanced.

The invention provides a method for manufacturing a polytetrafluoroethylene superfine fiber and an electrostatic spinning device thereof. The method comprises the steps of dissolving polytetrafluoroethylene in N-methyl pyrrolidone, adding graphene, performing ultrasonic dispersion evenly, and obtaining spinning solution; after the spinning solution is defoamed, performing electrostatic spinning at a spinning speed of 3.0-5.0 ml/h and a spinning voltage of 20-25 kV in the presence of ionic wind, and obtaining the polytetrafluoroethylene superfine fiber. The method has the advantages that ions are generated around the position of a pinhole of a needle through the weak ionic wind, the ions neutralize part of electric charges on the jet flow surface, so that the jet flow stability and whipping controllability are enhanced, and not only can instable whipping of jet flow be avoided, but also over-distance orderly output of cellosilk can be performed.

The invention discloses a defoaming device and a defoaming method for an aramid fiber III spinning solution. The defoaming device comprises a defoaming tank and a circulatory system arranged on the outside of the defoaming tank, wherein a spinning solution feeding opening and a vacuum pump are arranged at the top of the defoaming tank; a discharging opening with a spinning solution delivery pump is formed in the bottom of the defoaming tank; the circulatory system is connected with the discharging opening and the spinning solution feeding opening; a multistage umbrella plate device for defoaming is arranged in the defoaming tank. According to the defoaming device disclosed by the invention, by adopting the multistage umbrella plate device, a high viscosity aramid fiber III spinning solution enters the multi-stage umbrella plate device in the defoaming tank through the feeding opening, the defoaming efficiency of a static mode in the prior art is improved and the structure of the defoaming tank is simplified. The device has the advantages of simple structure, low cost and small occupied area. When the device is used for a defoaming process, the number of the obtained minute bubbleswith the diameter below 0.03 mm is smaller than 5 and the loss amount of solvents in the defoaming process is smaller than 0.5 percent.

The invention discloses a preparation method of goat milk protein fibers, and solves the problems of poor degreasing effect and poor quality. The preparation method comprises the following steps of 1, taking goat milk, adding a nonionic surfactant, stirring, removing an upper-layer substance, adding ethanol, keeping the temperature for 0.5-1.0 h, removing the upper-layer substance, heating until boiling, filtering and drying to obtain goat milk protein powder; 2, dissolving goat milk protein powder in a sodium hydroxide solution, filtering, adding a cyclodextrine solution, dissolving step by step, stirring and mixing to obtain a goat milk protein solution; 3, quantitatively adding a cross-linking agent into the goat milk protein solution, carrying out defoaming treatment, mixing the goat milk protein mixed solution with viscose according to a ratio, and carrying out defoaming; 4, carrying out two-bath wet spinning on the mixed solution to obtain viscose trickles; 5, enabling the viscose trickles to be coagulated and formed through a coagulating bath, and obtaining fiber tows through a solidifying bath; 6, enabling the fiber tows to be subjected to aftertreatment, and obtaining the goat milk protein fibers. The method has the advantages of improving the degreasing effect and the fiber quality and the like.

The invention relates to a flexible fiber having flame retardancy and a preparation method thereof. The flexible fiber is prepared from 1.5 to 2.5 parts by weight of a cellulose pulp plate, 17 to 19 parts by weight of an ionic liquid, 1.5 to 2 parts by weight of amino silicone oil and 19 to 21 parts by weight of hydroxyl silicone oil. The preparation method comprises putting the cellulose pulp plate in the ionic liquid to obtain a cellulose solution, adding the amino silicone oil into the cellulose solution to obtain a blended spinning liquid, carrying out ultrasonic treatment and standing to remove bubbles, carrying out spinning through a dry-jet wet spinning technology, collecting fibers, soaking the fibers in deionized water, carrying out drying, dipping the fibers in the hydroxyl silicone oil for surface coating and carrying out drying. The preparation method has simple processes. The prepared fiber is soft, has flame retardant effects and provides broad prospects for the application of cellulose fiber products.

The invention discloses a piece of equipment and a method for non-contact dissolution and deaeration of a high-concentration and high-viscosity spinning solution. The equipment for the dissolution and deaeration comprises a gear assembly, wherein a material cup is disposed on the gear assembly; and the material cup is connected to a temperature control device and a pressure control device respectively. The method for the dissolution and deaeration comprises the steps that a polymer and a solvent are directly added into the material cup, the temperature control device is started, the gear assembly is started, revolution and rotation of the material cup are conducted, temperature and rotation speeds are adjusted, and the spinning solution is obtained after the dissolution of the polymer and the solvent; and the pressure control device is then started, the temperature and the rotation speeds are adjusted, and the transparent and clear spinning solution is obtained after the deaeration of the spinning solution. According to the invention, raw materials are dissolved firstly under a zero vacuum degree or a low vacuum degree to prepare the spinning solution; and then, the deaeration of the spinning solution is conducted under a high vacuum degree, and the dissolution and the deaeration of the spinning solution can be completed in the same equipment. In this way, integration of the efficient dissolution and the efficient deaeration of the spinning solution can be achieved; and efficiency of the dissolution and the deaeration can be increased.

The invention relates to a preparation method of polyimide nanofiber, and mainly aims to solve the problems of poor diameter uniformity of the polyimide nanofiber and tendency to form beads in electrostatic spinning due to wide molecular weight distribution and large quantity of gel particles during preparation of the polyimide nanofiber with a two-step process in the prior art. The preparation method of the polyimide nanofiber comprises the following steps: dissolving X mole of diamine in an organic solvent, and adding Y mole of dianhydride for reacting to obtain a prepolymer solution 1; dissolving Z mole of diamine in an organic solvent, adding K mole of dianhydride for reacting to obtain a prepolymer solution 2; adding the prepolymer solution 2 into the prepolymer solution 1 to obtain apolyamide acid solution; deaerating and filtering the polyamide acid solution, and performing electrostatic spinning and amination to obtain uniform polyimide nanofiber. By adopting the preparation method, the problems are well solved. The preparation method can be applied to the continuous production of the polyimide nanofiber.

The invention relates to a viscosity homogenizing/bubble removing integrated device and method for a preceramic polymer spinning melt. The device comprises a bubble removing kettle and is characterized in that the upper portion of the bubble removing kettle or a kettle upper cover is provided with a feeding metering pump, the bottom of the bubble removing kettle is provided with a spinning metering pump, a first umbrella-shaped guide face, a second umbrella-shaped guide face, a third umbrella-shaped guide face and a fourth guide and temperature homogenizing arc face are sequentially arranged in the inner cavity of the bubble removing kettle from top to bottom, the joint of the first umbrella-shaped guide face and the inner wall of the bubble removing kettle is provided with a first overflow seam, and the joint of the second umbrella-shaped guide face and the inner wall of the bubble removing kettle is provided with a second overflow seam. The method uses the viscosity homogenizing/bubble removing integrated device to perform viscosity homogenizing and bubble removing. The viscosity homogenizing/bubble removing integrated device and method has the advantages that bubbles in the spinning melt can be completely removed while melt temperature and viscosity homogenizing can be achieved, bubble removing efficiency and melt viscosity uniformity are increased, the breaking and deformation of thin spinning flow and fiber breakage during spinning can be avoided, original fiber defects can be reduced, and the performance of the finished-product ceramic fibers can be increased.

The invention relates to a preparation method of carnosol and chitosan composite nanofiber felt, comprising: dissolving chitosan in formic acid solution and stirring to obtain chitosan solution; mixing carnosol and chitosan The solution is mixed, stirred, and ultrasonically degassed to obtain a carnosol/chitosan solution, which is then electrostatically spun. The method of the invention is simple and easy to implement, and is easy to be industrialized, and the obtained carnosol composite nanofiber mat can be used in fields such as wound dressings, has excellent antibacterial effect, and has broad application prospects.

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 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 viscose 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.

The invention discloses a preparation method and application of toughening operation gauze with the ultrahigh water-absorbing quality. The method comprises the steps that polyacrylonitrile, sodium alginate, hydroxyethyl cellulose powder and deionized water are adopted to prepare mixed spinning liquid, the mixed spinning liquid is subjected to centrifugation, standing, sediment removal and vacuum defoamation, and then added into a wet spinning machine, filaments are separated out and formed in coagulating bath after the product is metered by a metering pump and extruded out by a spinning nozzle, gray fabric is obtained after stretching, shaping and spinning treatment are conducted, the obtained gray fabric is dipped into a hot water tank of an annealing, boiling and bleaching machine to besubjected to high temperature washing and modification, the modified gray fabric is dipped into the mixed liquid prepared from vinyl chloride vinyl acetate, ammonium citrate, chitosan and water to besubjected to secondary modification, and the finished product of the gauze is obtained after scutching and drying are conducted. The prepared toughening operation gauze with the ultrahigh water-absorbing quality has the good water-absorbing quality, and the high toughness, and has the good application prospect in the medical supply industry.