24results about How to "Improve spinnability" patented technology

The application discloses a method for preparing silicon carbide ceramic fibers by combining sol-gel and dry spinning. The method comprises the following steps: 1) after preparing a second silicon-based sol, a spinning aid is added to prepare a spinnable silicon-based sol; 2) the spinnable silicon-based sol is prepared into fiber filaments by using a dry spinning process; 3) the fiber filaments are cracked into silicon-carbon-oxygen fibers; and 4) the silicon-carbon-oxygen fibers are sintered into silicon carbide ceramic fibers. The method is different from a mainstream polycarbosilane precursor method for preparing silicon carbide ceramic fibers, does not need a non-melting treatment process, has the advantages of adjustable composition, low raw material cost and simple process and the like, and has important significance for low-cost preparation of silicon carbide ceramic fibers.

This invention provides a method for detecting the spinnability and uniformity of spandex spinning dope. The method involves performing steady-state and dynamic tests on the spandex spinning dope to obtain its non-Newtonian index, viscosity coefficient, yield stress, maximum stress in the linear viscoelastic region, and maximum strain. Analysis of these test results yields a determination of whether the spandex spinning dope possesses excellent spinnability and uniformity. This method offers the advantages of rapid detection and accurate results. Spandex spinning dopes that pass this method exhibit minimal gelation during storage and excellent fluidity. During spinning, they show minimal yarn breakage and snagging, and a low probability of malfunctions, demonstrating excellent spinnability and uniformity.

The invention belongs to the technical field of sheath-core composite fibers, and particularly relates to a preparation method of an efficient temperature-adjusting sheath-core composite fiber, and the preparation method comprises the steps of preparation of an aluminum organic ligand, preparation of a sheath layer melt and melt spinning. According to the invention, dicyclohexylmethane diisocyanate and monoethanolamine are subjected to an addition reaction to generate urea bonds which are coordinated with Al < 3 + > to obtain an aluminum organic ligand, Al2O3 which is uniformly distributed is generated in situ in a PA matrix in the melt blending process of the aluminum organic ligand and the PA matrix, the heat conductivity of a skin layer is improved, and the heat conductivity of the skin layer is improved under the combined action with a phase change material in a core layer; the synergistic effect of rapid heat conduction and phase change temperature adjustment is achieved, and efficient temperature adjustment and rapid heat conduction and heat dissipation are completed. The high-efficiency temperature-adjusting sheath-core type composite fiber prepared by the invention can be applied to the fields of home textiles, clothing and the like, and has a better application prospect in mattresses due to good temperature sensing capability.

The invention relates to an oiling agent for chemical fiber spinning and a preparation method and application of the oiling agent. The oiling agent comprises novel oligomeric potassium alkyl sulfate, a nonionic surfactant, an emulsifier, solvent oil and water. The emulsion formed by dissolving the novel oligomeric alkyl sulfate potassium salt oil agent in water has excellent stability, and does not have obvious phase separation phenomena such as sinking and floating after standing at room temperature for 56h. When the oiling agent for chemical fiber spinning disclosed by the invention is applied to the field of chemical fiber production, chemical fibers can be endowed with excellent antistatic property and smoothness, so that the spinnability of the chemical fibers is better; and the oiling agent belongs to a green phosphorus-free formula, so that the spinnability index of chemical fibers is guaranteed, and the pollution of discharged water to the environment is reduced.

This invention relates to a blending process for hemp fiber and sorona fiber, belonging to the technical field of blending and processing of natural fibers and bio-based elastic fibers. The blending process for hemp fiber and sorona fiber of this invention includes the following steps: raw material selection → pre-spinning process → post-spinning process → packaging. This invention solves the problems of poor spinnability, high breakage rate, and stiffness and wrinkling in pure wet-spun hemp through specific proportions and wet spinning processes, achieving high-count, stable, and high-quality production. This significantly improves spinnability, enhances yarn quality, and greatly improves hand feel and comfort, achieving high elasticity and comfort to meet user needs.

This invention discloses a method for preparing conductive PET fiber. The invention relates to the field of functional chemical fiber preparation technology. The method involves copolymerizing bis(2-hydroxyethyl) disulfide (HEDS, 2-5 mol% of the total molar amount of diols) with terephthalic acid and ethylene glycol to prepare disulfide-modified PET (SS-PET). TiO2@ATO conductive whiskers (aspect ratio not less than 20, whiteness index not less than 80) are treated with a titanate coupling agent and then melt-blended with SS-PET to prepare ATO-SS-PET composite masterbatch. High-viscosity pure PET is used as the core layer, and ATO-SS-PET composite material is used as the sheath layer (whisker content 5-12 wt%), with a core-sheath mass ratio of 60:40-80:20. The finished fiber is obtained through core-sheath composite melt spinning, multi-stage hot roller stretching, and high-temperature, high-pressure dyeing with disperse dyes. During the dyeing process, the disulfide bonds in the sheath are dynamically exchanged at 125–135℃, which drives the stretched and disassembled conductive whiskers to re-randomize and re-align, and the three-dimensional conductive permeation network is self-repaired and rebuilt in situ.

The application discloses a kind of double-wrapped wool synthetic fiber high count high strength cotton spinning and its preparation method and application, belong to textile technical field.The method includes wool pretreatment, opening, carding, drawing, roving, spinning (add the first synthetic fiber filament), bobbin, doubling and twisting reverse wrapping (add the second synthetic fiber filament) and the like steps.The application adopts two synthetic fiber filaments to cross double-wrapped processing to wool or wool and synthetic short fiber blended yarn, and adopts positive and negative direction twisting direction combination in spinning and twisting process, effectively eliminates internal stress of yarn, eliminates yarn setting process.The prepared yarn is high in strength, has less hair, and even in evenness, can solve the problems of low production efficiency and poor yarn quality of high-count wool blended yarn, and is suitable for weaving processing of thin high-grade fabrics.

The application discloses a preparation method of superfine denier electromagnetic shielding functional chinlon and a product thereof. The chinlon is prepared by mixing 2-7% electromagnetic shielding functional chinlon master batch containing Fe3O4 nanoparticles and 93-98% pure chinlon chips, and then performing drying, melt extrusion, spinning cooling, oiling treatment, drafting setting and winding silk collection. In the preparation process, key parameters such as spinning temperature, filter mesh size, cooling parameter and drafting multiple are optimized, so that the problems of superfine denier fiber spinning breakage, product adhesion and uneven dispersion under high master batch content are solved. The chinlon monofilament fineness obtained by the application is 0.2-0.5 dtex, the breaking strength is greater than or equal to 3.0 cN / dtex, the electromagnetic shielding effectiveness reaches 40 dB in a frequency range of 2000 MHz, the thermal stability is better than that of pure chinlon, and the application is suitable for high-end application scenes such as high-grade clothes, home textiles, electronic protection and filtering materials.

The invention relates to the field of synthesis of regenerated polyester, and discloses a preparation method of regenerated extinction cationic dyeable polyester, which is characterized in that BHET with the polymerization degree of 2-4, a tri-monomer, a stabilizer and an oxidizing agent are subjected to in-situ polymerization to prepare the regenerated extinction cationic dyeable polyester. The problems that the regenerated cationic polyester is poor in color value and unstable in spinning and titanium dioxide and three monomers are easy to self-polymerize and agglomerate to form large-particle gel are solved, and the quality and spinnability of the regenerated extinction cationic dyeable polyester are remarkably improved; according to the method, when the phenyl glycidyl ether and the phosphite ester are combined for use, agglutinated particles are completely not generated in a polyester melt, the DF value of the polyester can be remarkably reduced, the regenerated extinction cationic polyester can be subjected to melt direct spinning, the b value of the extinction cationic polyester can be remarkably reduced, and the yellowing effect of the extinction cationic polyester is remarkably inhibited; the color value of polyester is obviously improved.

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.

This invention relates to the field of chemical fiber technology, specifically disclosing a polyester-nylon composite yarn and its preparation method. The polyester-nylon composite yarn is a parallel composite fiber composed of sulfonate-copolymerized PET and sulfonate-copolymerized PA66. The sulfonate groups in both components are bridged by divalent metal cations to form an ionic cross-linking network. This invention significantly enhances the interfacial bonding force between PET and PA66 while maintaining good spinnability by simultaneously introducing sulfonate groups into PET and PA66 and combining them with divalent metal ion bridging. This effectively inhibits phase delamination, resulting in a composite yarn with excellent mechanical strength, alkali resistance, and crimp elasticity. This invention can obtain polyester-nylon composite yarn with good crimp, high strength, and strong interfacial bonding force without texturing treatment. Furthermore, the preparation process is simple and easy to implement industrially, showing broad application prospects in the fields of high-performance textile fabrics and industrial textiles.

The present application relates to a kind of not to precipitate long-acting superhigh flame-retardant efficiency propylene flame retardant, including flame retardant T-DOPO and polybucum, the content of flame retardant T-DOPO is 50%-90%, the content of polybucum is 10%-50%, by the flame retardant in the present application is added into propylene material, propylene can reach B1 grade flame-retardant effect, and propylene is stronger in the process of spinning, and inorganic salt crystal cannot be precipitated.

This invention discloses a method for preparing a composite nanofiltration membrane by electrospinning with a mixed solvent. The method includes dissolving polyacrylonitrile (PAN) in a mixed solvent of N,N-dimethylformamide (DMF) and dimethyl sulfoxide (DMSO), stirring the solution until it is completely transparent under water bath heating, and allowing it to stand to remove bubbles to obtain a PAN electrospinning solution; electrospinning the PAN solution to form a membrane, and then hot-pressing and drying it to obtain a PAN nanofiber membrane; impregnating the PAN nanofiber membrane with a piperazine (PIP) aqueous solution, tumbling it with a rubber roller, and adding a trimesoyl chloride (TMC) n-hexane solution to synthesize polyamide (PA) as the top layer to obtain a PA / PAN composite nanofiltration membrane. This composite membrane has high flux and rejection rate for both salts and dyes.

This invention discloses a silicon carbide fiber precursor polycarbosilane and its preparation method, belonging to the field of polycarbosilane preparation technology. The preparation method of the silicon carbide fiber precursor polycarbosilane includes the following steps: Step 1: Preparing a Grignard reagent; Step 2: Adding an organic alkane to tetrahydrofuran, stirring and mixing, then slowly adding it to the Grignard reagent, stirring and reacting; after the reaction is complete, heating to room temperature, adding a composite organic auxiliary agent, stirring and reacting; after the reaction is complete, quenching the reaction, separating the liquids, washing, and drying to obtain a prepolymer; Step 3: After vacuum distillation of the prepolymer, transferring it to a reaction vessel, heating and polymerizing it under argon atmosphere; after the reaction is complete, adding it to toluene, dissolving, filtering, precipitating, and drying to obtain the silicon carbide fiber precursor polycarbosilane. The polycarbosilane prepared by the above method has excellent thermal stability and high-temperature mechanical properties.

The application discloses a preparation method of high-strength Lyocell regenerated cellulose fiber, and aims to solve the problem of insufficient mechanical strength of existing regenerated cellulose fiber caused by too wide molecular weight distribution of pulp. The method is characterized in that, through the synergistic effect of a mild pre-hydrolysis kraft (PHK) cooking process and an optimized multi-stage elemental chlorine-free (ECF) bleaching sequence (D0-E-D1), the lignin and hemicellulose are efficiently removed, and the long molecular chain of cellulose is maximally protected; through multi-stage gradient cold alkali extraction and purification treatment, the alkali concentration and low-temperature conditions are accurately controlled, and short-chain cellulose is selectively dissolved, so that the active regulation and narrowing of the molecular weight distribution of cellulose are realized, and a dissolving pulp with high polymerization degree and concentrated molecular weight distribution is obtained. Finally, the high-quality dissolving pulp is used to prepare Lyocell fiber with significantly enhanced mechanical properties through NMMO solvent system dry-jet wet spinning.

This invention discloses a method for preparing carbon fiber thin film materials and their applications. It includes the following steps: A) mixing PAN and PVP of different molecular weights in a mass ratio and dispersing them in DMF to obtain a mixed solution; B) dissolving Cu(NO3)2·3H2O in DMF and sonicating it to obtain a transparent solution; C) adding Cu(NO3)2 solution dropwise to the PAN / PVP mixed solution to obtain Cu... 2+ Step A: Spinning solution of doped PAN / PVP precursor; Step B: Obtaining composite fiber membrane by spinning; Step C: Taking the composite fiber membrane and subjecting it to multi-stage heat treatment to finally obtain Cu@CuN3 supported carbon fiber thin film material. The advantages are: when applied to stabilize the negative electrode of an aqueous zinc-ion battery as a protective layer, and assembled into an aqueous zinc-ion battery, it effectively suppresses dendrite growth in the negative electrode and improves the stable charge-discharge time of the battery, effectively solving the problem of negative electrode dendrite growth and improving the electrochemical stability of the battery, providing a new technical path for the development of high-safety, long-life aqueous zinc-ion batteries.

This application discloses a composite high-flowability, high-conductivity conductive masterbatch and its preparation method, relating to the technical field of conductive materials. The masterbatch uses a fiber-forming polymer as a matrix, compounded with conductive carbon black, graphene, silver nanosheets, carbon nanotubes, and modified MXene nanosheets, along with coupling agents, dispersants, antioxidants, and lubricants. The modified MXene nanosheets are modified with an amino-functionalized modifier and a polysaccharide mixture of sodium alginate and agar. Amino grafting improves interfacial compatibility, while polysaccharide coating inhibits filler agglomeration and oxidation, optimizing the dispersion of the conductive filler in the matrix. This masterbatch constructs a multi-level continuous conductive network, significantly improving melt flowability, conductive stability, and mechanical properties, effectively solving the problems of easy agglomeration, poor flowability, and insufficient spinnability of traditional conductive masterbatches.

The application discloses a kind of biodegradable polypropylene non-woven fabrics and preparation method thereof, belong to biodegradable polypropylene non-woven fabric technical field, the preparation method includes: preparation degradable master batch, preparation anti-aging master batch, mix, spinning draft;The preparation degradable master batch, polypropylene, polycaprolactone, erucic acid amide, maleic anhydride grafted polypropylene, first modified cellulose nanocrystal, second modified cellulose nanocrystal, stearic acid, 3-aminopropyl trimethoxysilane are added into high-speed mixer and mixed uniformly, then melt extrusion, granulation is carried out in twin-screw extruder, and degradable master batch is obtained;The application can improve the degradability of biodegradable polypropylene non-woven fabric, while improving the strength of non-woven fabric, elongation at break, spinnability, ultraviolet resistance, high temperature resistance, aging resistance.

This invention relates to high-temperature, high-strength zirconium-hafnium yttrium solid solution oxide continuous fibers, their preparation methods, and applications. In these continuous fibers, hafnium oxide replaces some zirconium oxide sites in a yttrium-stabilized zirconium oxide lattice, forming a single solid solution phase containing zirconium, hafnium, yttrium, and oxygen. The three metal elements are randomly distributed in the lattice, and the phase is either tetragonal or cubic. Using poly(zirconium acetylacetonate) and poly(hafnium acetylacetonate) as the zirconium and hafnium sources respectively, a spinneret is prepared with the addition of a stabilizer. Spinning is then performed to obtain precursor continuous fibers. After vapor pressure desorption and medium-temperature steam treatment, primary crystallized continuous fibers are obtained, followed by high-temperature ultrafast heat treatment to obtain the final product. The zirconium-hafnium yttrium solid solution oxide continuous fibers of this invention exhibit good high-temperature stability. After being held at 1500 °C for 120 min, they still possess high mechanical strength and excellent flexibility, with an average tensile strength of over 1.0 GPa for each filament. They can be used as high-temperature structural reinforcement materials and high-temperature flexible thermal insulation materials.

The invention discloses a preparation method of copolyesteramide, which comprises the following steps: (1) putting dibasic acid and dihydric alcohol into a reaction kettle according to the molar ratio of carboxylic acid group to alcoholic hydroxyl group of (2.0-2.1): 1, and carrying out esterification dehydration reaction at 150-190 DEG C for 2-3 hours; performing reduced pressure distillation to remove redundant dihydric alcohol and by-products to obtain ester group-containing dicarboxylic acid; (2) putting dibasic acid, the ester group-containing dicarboxylic acid, aliphatic diamine, lactam, a stabilizer, an end-capping reagent and other auxiliaries into a salifying kettle, and carrying out polymerization reaction at 220-250 DEG C under 1.0-1.8 MPa for 3-5 hours; then vacuumizing until the melt index is 35 to 40g / 10min; and (3) releasing the vacuum, and discharging while hot to obtain the copolyesteramide. According to the invention, the molecular weight and molecular weight distribution of copolyamide can be controlled, so that the whole molecular chain structure is uniform, and collaborative optimization of polyester and polyamide performance is realized to the greatest extent.

The application discloses a kind of liquid crystal polyester and its preparation method and application, belong to high polymer material technical field.The liquid crystal polyester includes the following structure Repeat unit: -O-Ar1-CO-, -O-Ar2-CO-, -O-Ar3-O-;-Ar1-For, -Ar2-For, -Ar3-For And At least one of in;The liquid crystal polyester includes the following structure End group: -O-C (=O)-CH3, end group content in the liquid crystal polyester is 0.13~0.2mmol / g.The liquid crystal polyester provided by the application has suitable content End group -O-C (=O)-CH3, and the ratio of repeat unit such as -O-Ar1-CO-, -O-Ar2-CO-, -O-Ar3-O- is appropriate, can improve the spinnability and film-forming property of liquid crystal polyester, improve the combination of liquid crystal polyester and other materials, so that the liquid crystal polyester is suitable for preparing fiber and film.

The invention relates to the technical field of fiber manufacturing, in particular to a special-shaped section polylactic acid hollow filament as well as a preparation method and application thereof. According to the filament, a stereocomplex crystal sc-PLA is constructed by adopting PLLA / PDLA in a near equal proportion, and a multifunctional epoxy chain extender, a polycarbodiimide hydrolysis-resistant agent, a quaternary ammonium salt organized flaky montmorillonite and phosphate / phosphonate metal salt compounded nucleation system and a polyether type reaction grafting hydrophilic agent with a sulfonate ion group and an epoxy reaction group are synergistically introduced. The hydrophilic groups are covalently fixed; and the washable stability is improved. The material meets the conditions that the sc-PLA melting peak is 220-235 DEG C, delta Hmsc is larger than or equal to 12 J / g, the proportion is larger than or equal to 0.55, the grafting rate is larger than or equal to 60%, the ion group retention rate is larger than or equal to 80%, and the contact angle is smaller than or equal to 70 degrees after washing is conducted five times; the wicking height after washing can be increased by more than or equal to 20% when the fabric is used for fabrics, and the fabric has warm keeping and lasting moisture guiding functions.

The invention provides antistatic flame-retardant polyamide 66 resin and a preparation method and application thereof.The antistatic flame-retardant polyamide 66 resin is prepared from polyamide 66 salt, a composite additive and a catalyst in specific parts, and the composite additive comprises an organic reactive flame retardant and an inorganic flame retardant; the organic reactive flame retardant and the inorganic flame retardant are jointly subjected to ball milling to obtain the flame retardant; by adding the specific composite additive, the dispersion uniformity of the composite additive in a polyamide 66 resin matrix can be effectively improved, the flame retardance of the material is improved, meanwhile, the addition amount of the flame retardant is reduced, the charring rate of the material is increased, and the compactness of a carbon layer is improved; in addition, the obtained antistatic flame-retardant polyamide 66 resin also has the characteristic of excellent spinnability, and is suitable for preparing antistatic flame-retardant polyamide 66 cellosilk with excellent mechanical properties and flame retardance.

The invention relates to the technical field of pre-oxidized fibers, and particularly discloses a cotton spinning pre-oxidized fiber and a preparation method thereof. The preparation method comprises the following steps: mixing a polyacrylonitrile precursor with a first modified oil agent to obtain a pretreated precursor; the first modified oil agent comprises polytetrafluoroethylene dispersion liquid, nano aluminum oxide and a silane coupling agent; carrying out gradient pre-oxidation on the pre-treated precursor in an air atmosphere under the conditions that the temperature is 215-255 DEG C and the tension is 1650-2100 cN, so as to obtain a pre-oxidized fiber; immersing the pre-oxidized fiber into a second modified oiling agent for oiling and curling to obtain a cotton spinning pre-oxidized fiber; the second modified oiling agent comprises an antistatic agent, a bundling agent and a moisture absorption friction increasing agent. According to the invention, the structural stability and antistatic property of the fiber are improved by controlling the condition parameters of pre-oxidation and optimizing the components and proportion of the first modified oil agent and the second modified oil agent, so that the spinnability of the cotton spinning pre-oxidized fiber is improved, and high-quality and large-scale cotton spinning processing of the pre-oxidized fiber is realized.