59results about "Spinning solutions preparation" patented technology

A process to produce cellulose ester fibers is provided, the process comprising: a. mixing cellulose ester and at least one solvent at a temperature ranging from about 60 ℃ to less than 90 ℃ to produce a cellulose ester dope; wherein the solvent comprises N, N-dimethylformamide, N, N-dimethylacetamide, or dimethyl sulfoxide, or mixtures thereof; and b. spinning the cellulose ester dope through at least one spinneret to produce the cellulose ester fibers; wherein the cellulose ester fibers have improved color over cellulose ester fibers produced from dope mixed outside about 60 ℃ to less than 90 ℃.

To provide a method for producing cellulose fibers that can produce high-strength regenerated cellulose fibers. [Solution] A method for producing cellulose fibers, characterized by comprising: a dissolution step of dissolving cellulose in a tetraalkylammonium hydroxide solution at a temperature of less than 45°C to produce a solution; and a spinning step of extruding the solution produced in the dissolution step into a coagulation solution at a temperature of less than 15°C to spin the fibers. Furthermore, it is preferable that the content of tetraalkylammonium hydroxide in the tetraalkylammonium hydroxide solution is 50% by mass or more and 60% by mass or less, and the content of water in the tetraalkylammonium hydroxide solution is 40% by mass or more and 50% by mass or less.

A method for improving a surface structure of a regenerated cellulose fiber, including: subjecting a mixture of 3-halopropene and an imidazole-type reagent to substitution reaction to obtain an imidazole-type hydrogen bond acceptor; mixing a hydrogen bond donor, a hydrogen bond acceptor enhancer and the imidazole-type hydrogen bond acceptor to obtain a dissolving system; mixing a wood pulp and the dissolving system, and dissolving cellulose of the wood pulp to obtain a cellulose solution; and subjecting the cellulose solution to spinning with dry-jet wet spinning process to obtain a regenerated product, and drying the regenerated product to obtain the regenerated cellulose fiber; where the imidazole-type reagent has a structural formula ofR being selected from the group consisting of H, alkyl, and alkenyl.

The present application relates to the technical field of fiber production process control, especially to a preparation method of a high-spinnable flame-retardant lyocell fiber with precipitation resistance, comprising the following steps: S1. treating cellulose pulp and regulating hemicellulose through a low-temperature activation process; S2. selecting a flame retardant and adjusting the crystal face exposure ratio of the flame retardant; S3. uniformly mixing the treated cellulose pulp and the flame retardant; S4. then performing free radical scavenging treatment to prepare stable spinning solution; S5. performing spinning through a dry-jet wet spinning process to ensure uniformity of the yarn formation; S6. performing crosslinking treatment on the nascent fiber; and S7. performing quality detection on the finished fiber and screening qualified products. The present application precisely controls the uniform distribution of the crosslinking agent in the fiber cross section through a radial penetration lag gradient formula of the crosslinking agent, ensures the dispersion stability of the flame retardant in the spinning solution, makes the flame retardant and the cellulose molecules form a firm crosslinking combination, effectively locks the flame-retardant components, meets the long-term use requirements of textiles, and improves the safety of the products.

A process to produce cellulose ester fibers is provided, the process comprising: a. mixing cellulose ester and at least one solvent at a temperature ranging from about 60℃ to less than 90℃ to produce a cellulose ester dope; wherein the solvent comprises N, N-dimethylformamide, N, N-dimethylacetamide, or dimethyl sulfoxide, or mixtures thereof; and b. spinning the cellulose ester dope through at least one spinneret to produce the cellulose ester fibers; wherein the cellulose ester fibers have improved color over cellulose ester fibers produced from dope mixed outside about about 60℃ to less than 90℃.

The application discloses a kind of two-component modified binary polymer nanofiber array and its molecular model, preparation method and application, two-component modified binary polymer includes polyvinyl alcohol, chitosan, carbon nanotube, silver particle four components.Polyvinyl alcohol is grafted chitosan with hydrogen bond, polyethylene-chitosan is grafted carbon nanotube with covalent bond, silver particle is dispersed and supported in the gap and surface of polyethylene-chitosan-carbon nanotube nanofiber array.Polyvinyl alcohol and chitosan binary polymer have high interface affinity and stability, carbon nanotube has the function of dispersing binary polymer and electrical conductivity, silver component has electrocatalytic activity and electrical conductivity function, the two-component modified binary polymer nanofiber array obtained by the application has electrocatalytic reduction hydrogen peroxide, is applied to the construction of electrochemical sensor, realizes the high sensitivity and high stability detection hydrogen peroxide performance.

A method for producing a cellulose fiber includes dissolving cellulose in a tetraalkylammonium hydroxide solution having a temperature of less than 45° C. to form a dissolution liquid and spinning the dissolution liquid by discharging the dissolution liquid formed by the dissolving into a coagulation liquid having a temperature of less than 15° C.

An alginate-based fiber is made of a composition comprising an alginate, a cellulose and a polyol plasticizer, such as glycerol. The fiber is produced through extrusion in a curing bath containing calcium. The fiber provides excellent strength and flexibility in its unhydrated state for textile applications. The fiber can be used to produce textiles as compostable alternatives to petrochemical based polymers.

The present invention relates to (i) azeotrope-like compositions comprising dichloromethane, 1H,1H,2H-heptafluorocyclopentane, and a hydrofluorocarbon (HFC) with 4 to 6 carbon atoms, (ii) a spin fluid for flash spinning comprising this azeotrope-like composition and a polyolefin, and (iii) a process for the preparation of plexifilamentary fibrils of polyolefins using the spin fluid.

The present invention describes a method for the production of a spinning dope composition, said method comprising a homogenization involving vigorous mixing of a cellulosic pulp material in alkali solution, vigorous mixing implying supplying a power density to agitators used in the homogenization step of at least 150 kW / m3 (kW supplied to agitators per mixed unit of liquid volume), and thereafter a dissolution involving mixing of the cellulosic pulp material in the alkali solution to obtain a spinning dope composition, preferably the power density supplied to agitators used in the dissolution step is maximum 75 kW / m3 (kW supplied to agitators per mixed unit of liquid volume); and preferably the cellulosic pulp material in alkali solution is kept at a temperature of less than 0°C during the homogenization and during at least part of the dissolution. The present invention is also directed to a system intended for the production of a spinning dope composition.

The present disclosure is directed to systems and methods for synthesizing a spidroin. In some embodiments, the methods comprise synthesizing a monomer in vivo in a heterologous host, the monomer comprising an N-terminus IntC domain and a C-terminus IntN domain, and post-translationally polymerizing the synthesized monomer via in vitro split-intein mediated polymerization.

The present invention relates to a method for producing fibers, comprising the steps of preparing a dope containing lignin dissolved in a dope solvent and an additive polymer, wherein the dope solvent contains an ionic liquid and water; and extruding the spinning dope into a coagulation bath to obtain one or more fibers.

Disclosed herein are systems and methods for controlled administration of unsuspended particles. The system may include an agitation device, at least one reservoir, an infusion mechanism, and a delivery conduit. The system may be configured to infuse unsuspended particles to a patient that are heterogeneously or homogenously dispersed.

The present invention relates to a method for producing fibers, which includes a step of preparing a spinning dope containing a dope solvent, lignin dissolved in the dope solvent, and a carbon nanomaterial dispersed in the dope solvent, wherein the dope solvent contains an ionic liquid and optionally further contains water; and a step of extruding the spinning dope into a coagulation liquid to obtain one or more fibers.

A process for producing cellulose ester fibers is provided, the process comprising dry spinning a cellulose ester dope through a spinneret to make the cellulose ester fibers, wherein the cellulose ester dope comprises dissolved and / or dispersed solids (hereinafter "solids" ) and solvent, at least 35 wt. % of the solids comprises cellulose ester, and the solvent comprises N, N-dimethylformamide, N,N-dimethylacetamide, or dimethyl sulfoxide, or mixtures thereof, provided that if the solvent comprises N, N-dimethylacetamide: (i) the cellulose ester dope comprises not more than 50% by weight acetone, based on the total weight of the cellulose ester dope; or (ii) the cellulose ester dope comprises 0% by weight cellulose nanocrystals based on the total weight of the cellulose ester dope; or (iii) both (i) and (ii), wherein the combined weight of a polyurethane, polyolefin, nylon, polyester, and / or polyurethaneurea, if present in the cellulose ester dope, is not more than 60% by weight, based on the total solids in the cellulose ester dope; and wherein there is a substantial absence of an organic acid.

A cellulose ester fiber comprising cellulose ester wherein the fiber has a curvature factor of less than 3; a residual solvent concentration on the cellulose ester fiber of less than 5000 ppm by weight; and wherein the solvent comprises N, N-dimethylformamide, N, N-dimethylacetamide, or dimethyl sulfoxide, or mixtures.

This utility model discloses a system for preparing lyocell fiber spinning dope by modifying wood pulp, including an enzymatic purification kettle, a first washing kettle, a bleaching and impurity removal kettle, a second washing kettle, a pulverizer, a pulper, and a thin-film evaporator. The enzymatic purification kettle is connected to a first connecting pipe, which is equipped with a first delivery pump and a first press. The first press is connected to the first washing kettle, which is connected to a second connecting pipe. The second connecting pipe is equipped with a second delivery pump and a second press, which is connected to the bleaching and impurity removal kettle. The bleaching and impurity removal kettle is connected to a third connecting pipe, which is equipped with a third delivery pump and a third press. The third press is connected to the second washing kettle, which is connected to a fourth connecting pipe. The fourth connecting pipe is equipped with a fourth delivery pump and a fourth press. The fourth press, pulverizer, and pulper are connected in sequence. The pulper is connected to a fifth connecting pipe, which is connected to the thin-film evaporator via a screw delivery pump.

The invention relates to a method for manufacturing cellulosic slurry for man-made cellulosic fiber production having a main process (100), the main process (100) comprising method steps of -providing pulp slurry (101), -dewatering (102) the pulp slurry at least partly to form pulp mass, -opening (108) the pulp mass for producing pulp with loosened cellulosic fibers, -drying (109) the pulp with loosened cellulosic fibers in a flash dryer (11-17) to form fluffy pulp, -mixing (107) the fluffy pulp in a mixer (18; 20) with a cellulose-swelling or dissolving medium to form cellulosic slurry for man-made cellulosic fiber production. The invention relates also to an apparatus (10) for manufacturing cellulosic slurry for man-made cellulosic fiber production.

A cellulose ester fiber is provided comprising cellulose ester wherein the cellulose ester fiber has a tenacity of at least 1.8 g / denier; wherein the cellulose ester fiber has a residual solvent concentration on of less than 5000 ppm; and wherein the solvent comprises N, N-dimethylformamide, N, N-dimethylacetamide, or dimethyl sulfoxide, or mixtures.

The present application provides a polyacrylonitrile spinning solution and a preparation method and device therefor, and a polyacrylonitrile carbon fiber precursor. The preparation method comprises the following steps: 1) dividing a comonomer into two parts, parts A and B, part A accounting for 50-70% of the total weight of the comonomer, and part B accounting for 30-50% of the total weight of the comonomer; 2) mixing part A of the comonomer, acrylonitrile, an initiator, and a solvent to obtain a mixed material; 3) continuously pumping the mixed material into a microchannel reactor for primary polymerization to obtain a prepolymerization product system; and 4) adding the prepolymerization product system and part B of the comonomer to a batch polymerization kettle for secondary polymerization to obtain a polyacrylonitrile spinning solution. The preparation method can realize rapid removal of the heat of polymerization reaction, improve the efficiency of polymerization reaction, inhibit the generation of a polymer gel, and improve the distribution uniformity of copolymerized units in a polymer.

The present application relates to the field of regenerated cellulose fiber preparation, in particular to a use of a polymer in the preparation of lyocell fiber. The polymer is used to stabilize the cellulose spinning solution with N-methylmorpholine-N-oxide (NMMO) as solvent, so as to improve the thermal stability and / or color of the cellulose spinning solution under heating conditions. The polymer is a lactone polymer or a salt thereof, comprising at least one specific structure of repeating units (I), (II), (III) and / or (IV), and the number average molecular weight is 500 Da-500,000 Da. By adding the polymer to the cellulose spinning solution in the cellulose dissolution stage and / or the spinning solution maturation stage, the cellulose main chain rupture, the thermal degradation and / or oxidative degradation of NMMO solvent and the free radical initiated degradation reaction can be effectively inhibited, so as to reduce the spinning solution viscosity attenuation and the color increase, and improve the stability of the lyocell fiber preparation process and the consistency of the finished fiber quality.

The present invention relates to (i) an azeotropic or azeotrope-like composition comprising (1) dichloromethane and 1H,4H-octafluorobutane, or comprising (2) dichloromethane and 1-methoxynonafluorobutane, or comprising (3) dichloromethane and 1‑ethoxynonafluorobutane, (ii) a spin fluid for flash spinning comprising these azeotropic or azeotrope-like compositions and a polyolefin, and (iii) a process for the preparation of plexifilamentary fibrils of polyolefins using the spin fluid.

This invention discloses a high-performance spinning method for hollow fiber membranes and its preparation method, relating to the field of polymer membrane material preparation. The invention employs a reactive precursor system constructed from side-chain silanized polyarylether sulfone, a surface-silanized metal-organic framework, and a latent hydrophilic agent. Through a gradient reactive wet spinning process, after segmented air-gap initiation and pH-buffered solidification, an inorganic-organic interpenetrating network is constructed in situ using low-temperature solvothermal chemical crosslinking technology. The hydrophilic components are fixed through a dual mechanism of discrete ion anchoring and physical embedding. Combined with gradient solvent displacement and explosion-proof vacuum drying, this invention effectively solves the problems of pore collapse caused by high-temperature annealing, loss of physically blended fillers, and hydrophilicity degradation in traditional technologies, significantly improving the membrane's structural stability, mechanical strength, and long-term antifouling performance.

The present invention relates to a fiber manufacturing apparatus and, more specifically, comprises: a polymerization reactor for forming a polymer by polymerizing monomers; a modification reactor for forming a modified polymer by modifying the polymer formed in the polymerization reactor; a spinning dope reactor for preparing a polymer solution by dissolving the polymer or the modified polymer in a solvent; a centrifugal spinning disc for spinning the polymer solution prepared in the spinning dope reactor; and a collector for collecting a fiber manufactured by being spun from the centrifugal spinning disc.