9results about How to "Improve spinnability" patented technology

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.

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.

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.

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 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.

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 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.