23results about "Spinning solution filtering" patented technology

The invention belongs to the field of high-performance materials, and discloses a high-thermal-conductivity PBO fiber and a preparation method thereof, and the preparation method comprises the following steps: (1) preparing a PBO polymer solution with a conventional molecular weight; (2) preparing an ultra-high molecular weight PBO polymer solution; (3) mixing the two PBO polymer solutions in a double-screw extruder according to a certain proportion to obtain a PBO spinning solution; (4) preparing as-spun PBO fibers by adopting a dry-wet liquid crystal spinning process and a condensed state structure regulation and control means; and (5) washing, drying, oiling and winding the as-spun PBO fiber to obtain the high-thermal-conductivity PBO fiber. According to the method, a small amount of the ultra-high molecular weight PBO polymer is added into the conventional spinning solution, the heat conduction performance of the PBO fiber is remarkably improved through the induced orientation crystallization effect of an ultra-high molecular weight PBO long chain, and the method has good application prospects in the field of high-power radio frequency microwave circuits with high requirements for heat dissipation capacity.

The invention discloses an integrated rheology detection and automatic control method and device. The method comprises the following steps: S1, acquiring a viscosity detection value of slurry; s2, the viscosity detection value of the slurry is compared with a viscosity set value, if the viscosity difference value exceeds a set range, the viscosity is dynamically adjusted through a pre-established logic control model, and the logic control model is used for adjusting the viscosity difference value within the set range by adjusting model factors related to the viscosity; the model factors include a temperature factor and a pressure factor associated with viscosity. The temperature, the pressure and the rotating speed are dynamically adjusted through the logic control model, so that the viscosity is adjusted; through multi-parameter cooperative control, the rheological fluctuation amplitude of the slurry can be greatly reduced, the consistency of the slurry is improved, and the spinning spinnability and the strength uniformity of tows are improved.

The present invention refers to a method and device for the preparation of microfibres and nanofibres based on hyaluronic acid and / or a water-soluble metal or non-metal salt thereof or a mixture of salts and / or a derivative of hyaluronic acid by method of dry spinning, and two-dimensional or three-dimensional fibrous materials from this microfibres and nanofibres. The resulting 2D or 3D materials can be for example in the shape of layer or cotton wool. Furthermore, the present invention refers to a device for performing this method, that contains an extrusion part containing a pass-through channel, that has an inlet opening for feeding the spinning solution and a dispensing opening for dispensing the spinning solution and furthermore the device contains an air nozzle, the air outlet opening of which is arranged to direct the exiting air into the area surrounding the dispensing opening of the extrusion part parallel to the axis of the dispensing opening of the extrusion part.

The invention discloses a bacteriostatic material for menstrual period trousers and a preparation method of the bacteriostatic material, and belongs to the technical field of hygienic products. The antibacterial material aims at solving the problem that in the prior art, an antibacterial material for menstrual period trousers is poor in moisture absorption and menstrual blood maintaining capacity, the antibacterial material for the menstrual period trousers integrates the long-acting antibacterial function, the efficient moisture absorption function and the peculiar smell control function, bacteria breeding can be effectively inhibited, infection can be effectively prevented, the menstrual blood can be rapidly absorbed and firmly locked, peculiar smell can be eliminated, and the antibacterial material for the menstrual period trousers has a good antibacterial effect. The three troubles of menstrual period sanitation, dryness and peculiar smell are comprehensively solved.

The application discloses a preparation method of low-grain-size polyacrylonitrile precursor. The method comprises the following steps: drying and densifying the fiber after hot water drawing and oiling through 10-25 hot rollers, wherein the hot roller pressure is 0.45-0.55 MPa, the temperature interval is 146-167 DEG C, the temperature gradient between the hot rollers is 3-5 DEG C, and then the fiber after the drying and densifying treatment is subjected to steam drawing under the steam pressure of 0.30-0.60 MPa, and the drawing ratio is 4.0-4.5 times, so as to obtain the low-grain-size polyacrylonitrile precursor. The application uses steam as the heating medium, and realizes the effective regulation of the grain size of the precursor by the low-temperature long-time drying and densifying technology and the high-multiple steam drawing technology, the regulation of the drying temperature and time of the precursor bundle, the gradual removal of the water molecules in the bundle by the outward diffusion, and the crystal rupture of the grains under the high stress by the high-multiple steam drawing.

A dissolving and defoaming device comprises a dissolving tank, a vacuum pump, a circulating pump and at least one filter. The dissolving tank is configured to accommodate an adhesive liquid. The vacuum pump is connected with the top of the dissolving tank and is configured to remove bubbles in the viscose liquid. The circulating pump is connected to the bottom of the dissolving tank and is configured to extract the viscose liquid from the dissolving tank. The filter is connected with the circulating pump and the dissolving tank and located downstream of the circulating pump and upstream of the dissolving tank. The filter is provided with a plurality of screen meshes, and the screen meshes are different in mesh number and are configured to capture impurities and other bubbles of different sizes in the viscose liquid extracted from the dissolving tank. The dissolving and defoaming equipment can provide uniform, bubble-free and impurity-free spinning solution, is beneficial to the spinning process in the later stage and the physical properties of formed fibers, and further improves the product yield.

This invention relates to the field of filter membrane preparation technology, specifically disclosing an equipment and process for preparing polyvinylidene fluoride (PVDF) membranes via phase inversion. The equipment includes a stirring and dissolving tank, a spinning tank, a core liquid tank, a spinneret, a first gel bath, a second gel bath, a winding device, and a control system. The stirring and dissolving tank and the spinning tank are connected via a first conveying assembly. Before spinning, this invention eliminates all air bubbles in the casting solution through the combined action of a mechanical stirring defoaming mechanism and a vibration defoaming mechanism in the spinning tank. This not only improves the quality of the subsequent spinning castings but also eliminates the need for a vacuum system. When the casting spinning traction speed changes, the fork-type telescopic adjustment frame can be adjusted via a telescopic drive component, thereby regulating the traction distance of the casting in the non-solvent or non-solvent mixture during traction. This ensures that the exchange rate between solvent and non-solvent in the casting remains the same, guaranteeing consistent product quality and performance.

The invention provides a nano-structure polyacrylonitrile fiber with dense inside and sparse outside and a preparation method thereof, and the method comprises the following steps: S1, dissolving polyacrylonitrile raw material powder in a solvent, and carrying out vacuum defoamation to obtain a polyacrylonitrile spinning solution with a certain concentration; s2, the spinning solution is extruded through a spinneret plate and enters a coagulating bath to be coagulated and formed, the temperature and concentration of the coagulating bath are regulated and controlled, and polyacrylonitrile nascent fibers with the uniform and compact structure are obtained; s3, washing the nascent fiber with water, drafting, drying and densifying to obtain the special polyacrylonitrile fiber with a nano-structure which is dense inside and sparse outside. The polyacrylonitrile fiber with the nano structure is prepared by regulating and controlling the solidification forming and drying densification processes, the average pore size of the center part of the cross section of the fiber is smaller than that of the edge part, and the fiber with the structure is higher in specific heat capacity value and has wide application prospects in thermal insulation materials.

The invention discloses a mixing device and method for ES composite fiber production, the mixing device comprises a mixing tank and a support frame, the mixing tank is rotatably mounted on the support frame, the inner wall of the mixing tank is fixedly connected with a partition plate, the inner wall of the mixing tank is rotatably connected with a fixing rod, and the mixing tank is provided with a power device. Raw materials are molten through the melting tank, the melting tank can be centrifuged, solid impurities are moved to the inner wall of the melting tank through centrifugation, bubbles are moved to the upper end, and then the molten raw materials are extruded through the piston block to flow into the mixing tank; the fixed impurities are pushed and scraped to the outer side of the fixed baffle plate by the fixed pressing plate along with extrusion and cannot flow into the mixing tank along with the raw materials, and bubbles are crushed, so that the raw materials entering the mixing tank do not contain the impurities and the bubbles, and the quality of the prepared composite fibers is higher.

The invention relates to an acid bath filtering system and method for viscose staple fiber production, the acid bath filtering system for viscose staple fiber production comprises an intermediate tank, an acid bath circulating barrel, a spinning machine, an acid bath head tank, a mixing barrel, a degassing mechanism, a tow filtering mechanism and a flash evaporation mechanism, the acid bath head tank is connected with the spinning machine through a pipeline and supplies acid bath liquid to the spinning machine; the spinning machine is connected with the degassing mechanism through a spinning acid return barrel by a pipeline and conveys reaction liquid to the degassing mechanism for degassing, the degassing mechanism is connected with the mixing barrel through a pipeline, the mixing barrel is connected with the acid bath circulating barrel through a pipeline, and the acid bath circulating barrel is connected with the tow filtering mechanism through a pipeline. The tow filtering mechanism is connected with the flash evaporation mechanism by a pipeline through a flash evaporation feeding barrel; the flash evaporation mechanism comprises flash evaporation equipment, a concentrated acid tank, a saltpeter extraction feeding barrel, saltpeter extraction equipment and a settling tank which are sequentially connected through pipelines, the settling tank is connected and communicated with the intermediate tank through a third acid falling pipeline, and the intermediate tank is connected and communicated with the tow filtering mechanism through a return pipe.

The application relates to a method for dry spinning high-performance aramid fiber, comprising the following steps: (1) dissolving terephthaloyl chloride and diamine in a mixed solvent under the condition of a protective gas to obtain a reaction system; (2) adding calcium hydroxide or ammonia gas into the reaction system after the reaction system in step (1) is reacted to obtain aramid spinning solution; (3) after the aramid spinning solution in step (2) is defoamed, the aramid spinning solution is metered and delivered to a spinning component and then enters a duct, is extruded and wound to obtain nascent fiber; (4) the nascent fiber in step (3) is washed by multiple ultrasonic waves and is subjected to water bath drawing; and (5) the washed fiber prepared in step (4) is subjected to drying and hot drawing, oiling treatment to obtain high-performance aramid fiber. The aramid fiber prepared in the application has higher molecular chain orientation degree and more compact internal structure, and thus has more excellent mechanical properties, and has wide application prospects in the fields of aerospace, special protection, electrical insulation and the like.

The present invention relates to a hyaluronate nonwoven fabric composed of hyaluronate fibers and a manufacturing method therefor, wherein a nonwoven fabric composed of only pure hyaluronate is provided without the addition of any heterogeneous fiber, such as PVA which is a binding fiber essentially added during a wet-laid nonwoven fabric manufacturing process, so that a nonwoven fabric composed of only hyaluronate fibers with excellent human compatibility and without cytotoxicity, skin irritation, and the like can be provided, and thus can be used as patches for cosmetic patches, wet wound dressings, tissue adhesion barrier membranes, and the like.

The invention provides a glue solution conveying control system and method in a solvent method short fiber production process, and the system comprises a glue solution preparation and pretreatment module, a glue solution storage and conveying module, a real-time monitoring and control module, a safety protection and emergency treatment module and a data recording and analysis module. The intelligent control valve is used for automatically adjusting the glue solution flow according to the requirements of the spinning machine, the sensor is used for monitoring the production process in real time, related parameters are automatically adjusted to prevent abnormity, a safety protection mechanism is arranged, abnormal conditions can be responded in time, remote access and deep analysis of data are supported, the production flow is optimized, and the production efficiency is improved. The invention aims to improve the automation level and the product quality of short fiber production.

Disclosed are a high-elongation meta-aramid fiber, a preparation method and an apparatus. The high-elongation meta-aramid fiber is prepared by: adding isophthaloyl chloride to a m-phenylenediamine solution, reacting at a stirring speed of 20-30 r / min, and adjusting the pH of the achieved reaction liquid to obtain a first slurry; adding isophthaloyl chloride to a m-phenylenediamine solution, reacting at a stirring speed of 25-35 r / min, adjusting the pH of the achieved reaction liquid, filtering insoluble matter, adding an initiator and isophthaloyl chloride at a stirring speed of 25-35 r / min for reaction, and adjusting the pH of the achieved reaction liquid to obtain a second slurry; uniformly mixing and then de-foaming the two slurries, and producing the high-elongation meta-aramid fiber through a wet spinning process.

This invention discloses a polymer melt extrusion device with intelligent temperature control, relating to the field of chemical fiber production equipment technology. It includes a mounting frame, an extrusion unit, a detection unit, a spinneret unit, and a bellows. The mounting frame is used to mount and fix the extrusion unit, which is used for melting the material. The detection unit is used to remove bubbles from the melt. The spinneret unit is used for spinning and post-heating the melt. The bellows is used for cooling and shaping the filaments. During the process of metering and melting the material through the extrusion unit, the detection unit detects and removes bubbles in the melt, improving the overall uniformity of the melt and preventing it from affecting the quality of the filaments. The spinneret unit spins the melt into filaments and then reheats them to eliminate internal stress in the fibers, preventing it from affecting the quality of the filaments. Finally, the bellows cools and shapes the filaments.

The invention relates to the technical field of viscose production, in particular to a defoaming system for viscose spinning pretreatment and viscose spinning pretreatment equipment. In an adhesive conveying unit of the defoaming system, each defoaming barrel is communicated with an air inlet of a condenser, and the condenser is communicated with a dry vacuum pump; a water outlet of the condenser communicates with the heat exchanger. The vacuum condensation unit is used for condensing and recycling gas generated in the defoaming process of the viscose conveying unit, so that the use amount of steam can be effectively reduced, and bubbles in viscose can be removed as much as possible; a heat exchanger in the vacuum condensation unit can exchange heat for condensate water, so that the use amount of a cooling medium can be reduced, and a good heat exchange effect can be ensured; the device for measuring the pressure, the temperature and the flow is arranged in the viscose conveying unit, and the valve capable of being automatically controlled is arranged, so that the liquid level, the temperature and the vacuumizing process in the defoaming barrel can be effectively and automatically controlled, the production cost is effectively reduced, and the production efficiency is improved.

A method of manufacturing bulked continuous carpet filament that includes providing a polymer melt and separating the polymer melt from the extruder into at least eight streams. The multiple streams are exposed to a chamber pressure within a chamber that is below approximately 25 millibars, or another predetermined pressure. The streams are recombined into a single polymer stream. Polymer from the polymer stream is then formed into bulked continuous carpet filament.

The invention provides a gel spinning solution with an acrylonitrile copolymer. The gel spinning solution comprises an acrylonitrile monomer, a comonomer, a compound chain transfer agent, an initiator, a solvent and a non-solvent. According to the invention, the non-solvent is introduced, so that the interaction between polyacrylonitrile and the solvent is weakened, the aggregation of polyacrylonitrile is promoted, the gel temperature of the existing polyacrylonitrile spinning solution can be obviously reduced, and the spinning process difficulty and the spinning cost are reduced. In addition, the invention also provides a preparation method of the gel spinning stock solution with the acrylonitrile copolymer.

The application discloses a process for preparing chitosan fibers based on a pre-spinning cross-linking method and belongs to the technical field of natural polymer fiber preparation, processing and application. Alkaline solvents are used to dissolve chitosan, a pre-spinning cross-linking process is adopted, namely, a cross-linking agent is added into the chitosan solution after dissolution to perform cross-linking, and the solution obtained after the cross-linking reaction is used as a spinning solution; then, a wet spinning process is adopted to prepare chitosan fibers. Since there is a chemical cross-linking action between the chitosan molecular chains in the chitosan fibers, the chitosan fibers still have certain acid resistance under an acidic condition and will not be dissolved, which has important significance for the practical application of the chitosan fibers in the field of textiles and garments.

A dissolving and degassing equipment includes a dissolution tank, a vacuum pump, a circulation pump, and at least one filter. The dissolution tank is configured to accommodate dope. The vacuum pump is connected to a top portion of the dissolution tank and is configured to remove bubbles from the dope. The circulation pump is connected to a bottom portion of the dissolution tank and is configured to draw the dope from the dissolution tank. The filter is connected to the circulation pump and the dissolution tank, and is located downstream of the circulation pump and upstream of the dissolution tank. The filter includes a plurality of sieves with different numbers of meshes, configured to capture impurities of different sizes and additional bubbles in the dope drawn from the dissolution tank.

The invention discloses a spinning device capable of achieving continuous formula switching, a control method and automatic spinning equipment, and relates to the field of spinning equipment, the spinning device capable of achieving continuous formula switching comprises a polymerization liquid treatment unit and a spinning unit, and the polymerization liquid treatment unit comprises a first treatment assembly, a second treatment assembly and a cleaning assembly. The spinning unit comprises a spinning material collecting pipe, and the spinning material collecting pipe is connected with the first processing assembly and the second processing assembly.The spinning device capable of continuously switching the formulas can efficiently and continuously process spinning production of different formulas, uninterrupted operation is achieved, the test and production efficiency is greatly improved, and the production cost is reduced. And the requirements of modern chemical fiber wet spinning production are met.

Systems and processes for producing short carbon fibers from an asphaltene-rich feedstock are disclosed. The asphaltene-rich feedstock are melted, filtered, and / or degassed before spinning into fibers. The molten feed may be spun using melt blowing or centrifugal spinning, to form random mats of discontinuous green fibers. These random mats of discontinuous fibers are suitable for transporting and processing using low-cost, standard bulk solids handling methods. In the methods discussed herein, the green fibers are first exposed within a reactor to a gas containing nitrogen dioxide (NO2) which infuses the fibers, thereby adding nitrogen oxide functional groups to the green fibers. The infused fibers are heated during which the infused fibers undergo oxidation leading to stabilization at low temperatures, allowing low softening point asphaltene-rich feeds to be successfully stabilized. The stabilized fibers are further heated in a substantially oxygen-free environment to carbonize the fibers to produce a random mat, discontinuous carbon fiber product. The produced random fiber material is suitable for blending into polymers or other matrices to produce random short carbon fiber reinforced products.

The invention belongs to the technical field of spandex processing, and particularly relates to multifunctional spandex spinning solvent equipment which comprises a solvent tank, a filtering mechanism is arranged in the solvent tank, a conical disc is fixedly mounted in the solvent tank, a plurality of drainage grooves are formed in the surface of the conical disc, and a stirring shaft is rotatably mounted in the solvent tank. A plurality of stirring rods are fixedly installed on the surface of the lower middle portion of the stirring shaft, a lantern ring is slidably installed on the upper middle portion of the stirring shaft, a conveying pipe is fixedly installed in the stirring shaft, a telescopic pipe is slidably installed on the top of the conveying pipe, the top of the telescopic pipe is communicated with the lantern ring through a rotating connector, and the top of the lantern ring is communicated with a spraying head. Through the arrangement of a stirring shaft, a fixing ring, a floating plate, a grinding roller, a spraying head and the like, spandex raw materials can be fully mixed, meanwhile, generated bubbles can be swept, ground and removed, pits or cracks are prevented from being formed on the surfaces of fibers, the mechanical property is improved, and the blocking probability is reduced.