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1171results about "Wet spinning methods" patented technology

Water-soluble polymer/graphene composite fiber as well as preparation method and application thereof

The invention relates to water-soluble polymer/graphene composite fiber as well as a preparation method and application thereof. The cross section of the fiber is special-shaped, the surface of the fiber is of an orientated micro-fiber-shaped structure, the strength of the fiber is greater than 100 MPa, the elongation at break is greater than 2%, and the conductivity of the fiber is greater than 0.1 S/cm. The preparation method comprises the following steps: preparing a composite spinning liquid, extruding into a coagulating bath for curing, drafting, leading out of the coagulating bath, drying, and coiling, thereby obtaining the water-soluble polymer/graphene composite fiber; and finally reducing by using a chemical or physical method, thereby obtaining the water-soluble polymer/graphene composite fiber. The cross section of the composite fiber provided by the invention is of a special-shaped structure, the surface of the fiber is of a rich groove micro structure, the strength and the toughness of the fiber are greatly improved when being compared with those of pure graphene fiber, and good conductivity is still maintained, so that the water-soluble polymer/graphene composite fiber has a wide application prospect in the fields such as anti-electrostatic and conductive fabrics, electromagnetic wave absorption and shielding fabrics, energy storage devices, sensors and water treatment.
Owner:DONGHUA UNIV

Biomimetic preparation method of high-strength regenerated silk protein fiber

The invention discloses a biomimetic preparation method of a high-strength regenerated silk protein fiber. The method takes high crystallization degree, high strength, high modulus nano cellulose whiskers with a large length-diameter ratio to simulate the beta-fold microcrystal in the natural silk fiber, then mixes the nano cellulose whiskers with a regenerated silk fibroin solution, and finally prepares the high-strength regenerated silk protein fiber through a wet spinning method. The characteristic that a large amount of hydroxyl groups in the molecular chains of the rigid nano cellulose whiskers can form intermolecular hydrogen bonds with polar groups such as carboxyl groups, amino groups, and the like, in the molecular chains of silk protein is utilized to achieve the structural bionics of the regenerated silk protein fiber, and thus improves the mechanical properties of the regenerated silk protein fiber. The preparation method is simple, and does not pollute the environment. The mechanical properties of the obtained regenerated silk fiber are equal to or even better than those of natural silk, and the regenerated silk fiber has the similar micro-structure and configuration as the natural silk.
Owner:浙江枫翎新材料科技有限公司

Preparation method for composite carbon fiber based on graphene/ polyacrylonitrile

The invention discloses a preparation method for composite carbon fiber based on graphene/ polyacrylonitrile. The preparation method comprises the following steps: adding 0.01-10 parts by weight of initiating agent under nitrogen protection into 1 part by weight of graphene or oxidized graphene, 10-1000 parts by weight of solvent and 10-1000 parts by weight of acrylonitrile monomer; heating to 50-95DEG C; reacting for 1-60 hours; precipitating, carrying out centrifugation, washing and drying to obtain the polyacrylonitrile grafted graphene; dispersing the polyacrylonitrile grafted graphene into polar organic solvent to obtain spinning solution sol; continuously extruding the spinning solution from a spinning head capillary at a constant speed to enter solidification solution; collecting the solidified primary fiber; and drying to obtain the graphene fiber primary silk; and carrying out chemical or thermal treatment to obtain the graphene/ polyacrylonitrile composite carbon fiber. The preparation method is simple and convenient, has simple technology, is convenient and quick for post-processing, and can be produced on a large scale. The obtained graphene/ polyacrylonitrile composite carbon fiber embodies excellent intensity, toughness, modulus thermal stability and electrical conductivity and can be applied in various industrial fields to replace the traditional carbon fiber.
Owner:杭州德烯科技集团有限公司

Preparation method of halogen-free flame retardant high-intensity polyvinyl alcohol fibers

The invention discloses a preparation method of halogen-free flame retardant high-intensity polyvinyl alcohol fibers, which is characterized by comprising the following steps of uniformly mixing 20-45 parts by weight of phosphate ester flame retardant powder with the average particle size no more than 1.0 microns, 1-10 parts by weight of dispersing agent, and 40-79 parts by weight of water to prepare flame retardant suspended slurry, continuously mixing the slurry and polyvinyl alcohol plus boron spinning solution with the polymerization degree of 1700-3000 and the alcoholysis degree more than 99 percent through a mode of spun injection, carrying out spinning with the mixed solution through a polyvinyl alcohol wet method plus a spinning process route, carrying out neutralization, wet-heat drawing, washing and drying on solidified fibers to obtain as-spun fibers, preheating the as-spun fibers to the temperature of 200-230 DEG C, drawing by 2-4 times, and then carrying out heat setting on the fibers at the temperature of 180-210 DEG C for 2-5min to obtain the halogen-free flame retardant high-intensity polyvinyl alcohol fibers. According to different uses, post-treatment steps such as formalization, oiling, curling, cutting and the like can be selectively carried out on the flame-retardant fibers. The flame-retardant fibers prepared through the method has the advantages of low toxicity and high intensity, realizes self-extinguishment after leaving fire, is free of halogen and the dripping phenomenon and is used for aspects of fabric flame retarding, enhancing flame retardant fabrics and the like, and the limited oxygen index can reach 28-30.
Owner:SICHUAN UNIV +2

Method for preparing high-performance polyacrylonitrile-based carbon fiber protofilament through dry spraying and wet spinning

The invention relates to a method for preparing high-performance polyacrylonitrile-based carbon fiber protofilament through dry spraying and wet spinning, which comprises the following steps: preparing a polyacrylonitrile spinning stock solution; filtering and metering the polyacrylonitrile spinning stock solution after the demonomerization and deaeration; squeezing obtained materials through a spinning jet for forming fine spinning streams for entering a coagulating bath for coagulating forming through an air section; and carrying out drafting, water washing, drying densification, steam drafting and drying hot forming to obtain the high-performance polyacrylonitrile-based carbon fiber. The fiber firstly passes through a section of air layer, and then enters the coagulating bath for spinning forming by a wet method. The fine streams of the spinning solution is in a cylindrical shape after leaving spinneret orifices under the action of the gas-liquid interface tension, a primary cuticular layer is formed, and the cuticular structure is smooth. The method has the advantages of simple process, easy control and relatively low cost. In addition, the method also has the advantages that the spinning speed is high, the production efficiency can be improved, in addition, the surface of the obtained protofilament is smooth, the residual quantity of the solvents is greatly reduced, the quality homogenization degree of the protofilament is improved, and the mechanical property is excellent.
Owner:ZHONGFU SHENYING CARBON FIBER

High-conductivity graphene fiber and preparation method thereof

The invention discloses a high-conductivity graphene fiber and a preparation method thereof. By the adoption of the wet spinning technology, oxidized graphene spinning liquid with the mass percentage being 1-10% is extruded from a spinning head into a coagulating bath to obtain an oxidized graphene gel fiber, the oxidized graphene gel fiber is collected on a graphite rolling shaft after being fully solidified, the oxidized graphene fiber is obtained, and the oxidized graphene fiber is sequentially subjected to chemical reduction, high-temperature thermal treatment and chemical doping. The prepared graphene fiber has high conductivity, and the conductivity of the prepared graphene fiber is one magnitude order higher than that of a common graphene fiber. The whole process is simple and controllable in technology, and conductivity of the graphene fiber is improved. The obtained graphene fiber has excellent mechanical property and excellent electrical conductivity and thermal conductivity. The high-conductivity graphene fiber can be used for preparing soft solar batteries, supercapacitors and wearable devices and can serve as a light wire to be used in ultra-light wires and cables, and it is hopeful to replace a metal copper wire with the graphene fiber for new-generation power transmission.
Owner:杭州德烯科技集团有限公司
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