185results about How to "Reduce wire breakage" patented technology

The invention relates to a polyether sulfone-polyurethane blend hollow fiber membrane and a preparation method thereof. In the hollow fiber membrane, polyether sulfone is taken as a main membranous material; polyurethane is added for blending; and a high molecular pore forming agent, a surfactant, a solvent and the like are added to prepare casting solution; and the polyether sulfone-polyurethane blend hollow fiber membrane is prepared by a dry-wet method, namely, a nonsolvent induced phase separation method spinning process. The prepared polyether sulfone-polyurethane blend hollow fiber membrane has seven inner bores with the inner diameter of 0.8 to 1.0mm and the outer diameter of 3.8 to 4.5mm, has high hydrophilcity, the flux of pure water of 300 to 2,900 L/M<2>.H(0.1MPa and 25 DEG C), high intensity and the tensile breaking force of 30 to 62N, has the advantages of high flexibility, the breaking elongation of 60 to 110 percent, high chemical resistance, high pollution resistance, and the like, and is easy to clean.

The invention relates to an immersed vacuum membrane distillation plant and a sewage treatment technology using the same. The immersed vacuum membrane distillation plant comprises a raw water storage tank, a gas dissolving pump, a raw water heating water tank, a membrane distillation hydrophobic membrane module, a condenser, a vacuum buffer tank, a vacuum pump, a water producing tank, a valve, a measuring instrument, and an automatic controller. The sewage treatment technology is characterized in that: raw water is subject to pH regulation, microfiltration and other pretreatment, then the pretreated raw water enters into the raw water storage tank, the sewage in the raw water storage tank is subject to gas-water mixing through the gas dissolving pump, and then the gas-water mixture enters into the raw water storage tank for heating to a specific temperature, membrane distillation is carried out at the specific temperature, the produced water after membrane distillation is directly reused, and a little thick water is treated concentrately. According to the invention, the use of the plant in sewage treatment reduces the effect of concentration polarization and temperature difference polarization in the sewage, reduces membrane pollution, increases the membrane distillation flux, prolongs the operation period of the membrane module, reduces the heat loss of the pipeline, and increases the heat utilization rate.

The invention relates to an inner support hollow fibrous membrane which adopts a hollow braided rope as an inner supporting material. A base body polymer, a metal organic framework material and a pore forming agent are mixed together to be dissolved with a solvent, a membrane casting solution is obtained, the membrane casting solution coats the hollow braided rope, and solidification forming is performed to obtain the inner support hollow fibrous membrane. The metal organic framework material is adopted for improving the porosity and water flux of the inner support membrane; the proper proportion of the metal organic framework material to the pore forming agent in the membrane casting solution, organic coordination and synergism of the components are utilized, the interface wettability of the membrane casting solution and a coagulating bath can be effectively controlled, a coagulator and solvents in the membrane casting solution are easily dispersed and penetrate into the interface, effective combination of the membrane casting solution formula and the pore forming conditions is utilized, and the inner support hollow fibrous membrane of different pore diameters and different rejection performances can be spun; the obtained inner support hollow fibrous membrane can be used for an MBR and an immersed ultrafiltration assembly, the probability of broken yarn and sewage plugging is lowered, and the service life of the membrane is prolonged.

The invention discloses polyacrylonitrile-based carbon fibers as well as a preparation method and an application thereof. The preparation method comprises the following steps: dissolving an oxygen-rich matter, siloxane and boric acid ester in water so as to prepare a humidifying solution; immersing polyacrylonitrile precursor fibers in an immersion device filled with the humidifying solution so as to obtain humidified polyacrylonitrile fibers; carrying out thermal treatment on the humidified polyacrylonitrile fibers in an oxidizing furnace; carbonizing the polyacrylonitrile fibers subjected to the thermal treatment so as to obtain the polyacrylonitrile-based carbon fibers. The invention also provides the polyacrylonitrile-based carbon fibers prepared from the method and the application of the polyacrylonitrile-based carbon fibers. The preparation method has the advantages that the yarn breakage phenomenon and the formation of a skin-core structure are reduced, and the mechanical property of the polyacrylonitrile-based carbon fibers is improved.

The invention relates to a method for improving the mechanical strength of end of film filament, wherein it uses corrosion-resistant macromolecule organic material to coat the top and bottom filament of hollow fiber film. And the invention is characterized in that: the it coast she filament at 10-40cm from the adhesive end, as local coat or integrated coat. And the organic material can be silica gel, epoxy resin, etc.

The invention discloses a control method for segregation and net carbon of an 86-grade high-strength cord steel wire rod. The control method comprises the following steps of: KR molten iron pre-desulfurization, BOF converter smelting, LF furnace refining, continuous casting CC, casting blank surface treatment, casting blank heating, controlled rolling and controlled cooling procedures which are carried out in sequence. The 86-grade high-strength cord steel wire rod comprises the following components in percentage by weight: 0.85-0.90% of C, 0.15-0.35% of Si, 0.40-0.60% of Mn, less than or equal to 0.015% of P, less than or equal to 0.010% of S, less than or equal to 0.010% of Cr, less than or equal to 0.005% of Al and the balance Fe. According to the control method, the segregation and netcarbon of the wire rod are improved by combining continuous casting of small square billets with wire rolling, the period and cost are greatly reduced, the sorbitizing rate of the prepared wire rod is larger than or equal to 90%, the center segregation of the wire rod is slight, no net-shaped cementite exists in the center, and the drawing use requirements of users are met.

The invention discloses a polyurethane fibre spinning oil. Its composition includes (by wt%) 5-80% of mineral oil, 10-75% of silicone oil, 0.5%-30% of epoxyethane and epoxypropane copolyether, 0.5%-50% of polyether silicone oil, 0.5-15% of antistatic agent and 0.1-10% of anti-sticking property improving agent.

The invention relates to a spinning technology of a two-spinning-roller semicontinuous high-speed spinning machine, and belongs to the technical field of semicontinuous spinning machines. The spinning technology comprises the steps of glue supplying, thread-line forming, spinning and winding, wherein the spinning is carried out through a spinning device. The spinning device comprises two spinning rollers which are transversely arranged relative to an operating surface of a spun surface, thread lines surround the spinning rollers, and drafting, solidifying and deacidification in the spinning steps are achieved when the spinning rollers rotate. The spinning technology solves the problems that thread lines of a semicontinuous spinning machine in the prior art are insufficient in reaction, the spinning process cannot be accelerated, and production efficiency and the product quality cannot be taken into consideration. The arrangement direction of the spinning rollers is changed so that the thread lines can walk for a longer distance while the spinning process of the spinning machine is accelerated and the structures of other components of original equipment are not changed, the thread lines can be reacted with acid bath more fully, and both production efficiency and product quality are taken into consideration.

The invention provides a hollow fiber ultrafilter membrane, which is obtained by a following mixture after film forming treatment: 14wt%-25wt% of film forming polymer, 0.1wt%-15wt% of meta aramid fiber, 6wt%-10wt of pore forming agent and 59wt%-80wt% of solvent. The invention also provides a preparation method of the hollow fiber ultrafilter membrane. The meta aramid fiber possesses high strength, and enables mutual interpenetration of different polymer chains, is capable of enhancing the mechanical strength of the film forming polymer, so that the hollow fiber ultrafilter membrane possesses high mechanical strength without wire facture, thereby the service life can be prolonged, the daily maintenance frequency can be minimized, and the water treatment cost can be reduced; The meta aramid fiber can increase the hydrophilic performance of the hollow fiber ultrafilter membrane, so that the contamination resistance is good, the flux is high and the attenuation speed is slow. The meta aramid fiber can enhance the heat resistance of the hollow fiber ultrafilter membrane and is more suitable for usage under rigorous condition.

The invention discloses a preparation method of carbon fiber precursor fiber and application of the carbon fiber precursor fiber. The carbon fiber precursor fiber is obtained by the steps as follows:dissolving an acrylonitrile polymer by utilizing a solvent to obtain a uniform spinning solution, allowing the spinning solution to pass through a spinneret hole to form a spinning flow which enters acoagulation bath component at the temperature lower than a gel temperature spot of the spinning solution and forms nascent fiber, and subjecting the nascent fiber to drafting, washing, drying and oiling post-treatment process. The carbon fiber precursor fiber is pre-oxidized and carbonized to obtain pre-oxidized fiber or carbon fiber. The carbon fiber precursor fiber has the advantages of low cost, good fiber performance and stable production under high-drafting conditions.

A braiding technique for reinforcing the root part of hollow fiber membrane module features that the anticorrosion and hydrophobic cord threads or nylon wires are used to be braided at the adhered positions on the top or bottom sides of hollow fiber membrane module to increase its strength. The number of the braided fibers in a bundle is 10-50 and the number of the braided lines is 1-5.

A low-cost preparation method of carbon fiber precursor fibers, preoxidized fibers or carbon fibers is characterized in that an acrylonitrile polymer is dissolved through a solvent to obtain a uniformspinning solution; the spinning solution forms fine spinning flow through spinning pores, and then the fine spinning flow enters a coagulating bath component which is below the spinning solution geltemperature point to obtain primary fibers; the primary fibers are processed by stretching, washing, drying and oiling to obtain the carbon fiber precursor fibers; and the carbon fiber precursor fibers are pre-oxidized and carbonized to obtain the preoxidized fibers or carbon fibers. The method has the advantages of being low in cost, high in fiber performance and stable to produce in a high-powerstretching condition.

The invention relates to a preparation method for multihole fine denier spandex. The preparation method is characterized by comprising the steps of (1) in a preparation process, polymerizing polytetramethylene ether glycol PTMG, 4,4-diphenylmethane diisocyanate (4,4-MDI) and diamine which serve as raw materials step by step to obtain a polyurea-based formic ether DMAC solution, adding functional auxiliary agents such as an antioxidant, a lubricating agent, a flatting agent, an ultraviolet absorbing agent and an antiblocking agent, performing spin-stretching, high-temperature drying and oil applying on the polyurea-based formic ether solution containing the auxiliary agents through a multihole spinning plate to obtain multihole fine denier spandex in which single fibers are not adhered to one another, and winding the multihole fine denier spandex to obtain a multihole spandex fiber roll; (2) in a use process, dividing the multihole fine denier spandex into single spandex fibers one by one under a certain stretching condition through a fiber separator, and putting the single spandex fibers into corresponding weaving units to be woven.

The invention relates to a polyethylene fiber composite cloth with high protection performance and preparation and application thereof, a preparation method comprises the following steps: 1) high-fineness ultra-high molecular weight polyethylene fibers are sequentially subjected to unwinding and tiling, heating and drafting, gluing and drying to obtain unidirectional polyethylene fiber cloth; (2) carrying out cross lamination and compounding on multiple layers of unidirectional polyethylene fiber cloth, rolling together with an isolating layer, and then carrying out vacuum hot-pressing shaping treatment, so as to obtain polyethylene fiber composite cloth; wherein the activation temperature of the glue is 50-150 DEG C, and the glue content is 5-30wt%; and the polyethylene fiber composite cloth is used in a soft bulletproof armor or a hard bulletproof armor. Compared with the prior art, the preparation method has the advantages that conventional high-denier monofilament and bunched ultra-high molecular weight polyethylene fibers are adopted, heating and drafting are carried out after unwinding and tiling, the activation temperature and the gluing amount of glue are controlled, and vacuum hot-pressing shaping treatment is carried out after compounding, so that the prepared polyethylene fiber composite cloth is good in appearance quality, high in bulletproof performance and small in discreteness.

The invention relates to a method for preparing recycled polyester high-purity synthetic particle. The method comprises the following steps: firstly, selecting recycled polyester raw materials, drying the materials, melting and extruding the recycled polyester raw materials through a double-screw extruder, putting in a viscosity increasing reaction kettle to carry out viscosity increasing reaction, filtering out small-particle impurities in the high viscosity melt after the reaction through a melt filter and carrying out underwater cooling and pelletizing to obtain the recycled polyester high-purity synthetic particle. The method disclosed by the invention has the advantages that the phenomena such as filament break and filament ossification in fore-spinning process of fiber can be reduced and the fiber finished product quality is increased, so that the production cost is saved and the purposes of low carbon and environmental protection are realized; when being used for spinning recycled multifunctional polyester staple fiber products, the recycled polyester high-purity synthetic particle produced by adopting the method is capable of reducing the phenomena such as the filament break and the filament ossification and in the fore-spinning process of fiber and increasing the quality index of fiber finished products; in the meantime, the method disclosed by the invention is capable of effectively utilizing various recycled chemical fibers and textile wastes, so that the cost is reduced and the purposes of comprehensive utilization of resources and more environmental protection are realized.

The invention discloses a high-speed dry-spray spinning method for preparing deformed section carbon fiber precursor fiber, pre-oxidized fiber or carbon fiber. An acrylonitrile polymer is dissolved byusing a solvent to obtain a uniform spinning solution, the spinning solution enters into a coagulating bath component of which the temperature is lower than the gelation temperature point of the spinning solution to form nascent fiber after passing through spinneret orifices to form a spinning trickle, and the working procedures of drafting, washing, drying and oil application aftertreatment arecarried out on the nascent fiber to obtain the carbon fiber precursor fiber. The carbon fiber precursor fiber is pre-oxidized and carbonized to obtain pre-oxidized fiber or carbon fiber. The method has the advantages of low cost and good fiber performance since fiber with similar straight toothed spur gear shape section characteristics is prepared in the condition of high-power drafting.

The invention relates to a preparing method of an internally-supported reinforced type polyvinylidene fluoride hollow fiber film. The preparing method comprises the steps that a sodium hydroxide aqueous solution is used for removing grease dirt on the surfaces of braided ropes, and then the hollow braided ropes are treated with a polyester-polyether block copolymerization type hydrophilic finishing agent; then, the outer surfaces of the treated braided ropes are coated with a thin layer of a polyvinylidene fluoride film casting solution, solidifying and forming are carried out, and the internally-supported reinforced type polyvinylidene fluoride hollow fiber film is obtained. Polyether soft segments and polyester hard segments exist in molecules of the adopted polyester-polyether block copolymerization type hydrophilic finishing agent, and according to the similarity and mutual attraction principle, the polyester hard segments can generate co-solubility and co-crystallization effects with polyester in the heated process to enable the hydrophilic finishing agent to be preserved on the braided ropes for long; meanwhile, the polyether soft segments can generate a co-solubility effect with the film casting solution to enable the polyester braided ropes and the polyvinylidene fluoride film layer to have good binding performance; the prepared internally-supported reinforced type polyvinylidene fluoride hollow fiber film can be used in MBR and immersion type ultrafiltration assemblies.

The invention relates to a preparation method of a PIPD/PBO (poly(dihydroxyphenylene pyridobisimidazole)/poly-p-phenylene ben-zobisthiazole) blend fiber and belongs to the technical field of blend fibers. The technology comprises the steps of preparation of a PIPD/PPA (phenyl-propanolamine) polymer solution, preparation of a PBO/PPA polymer solution, mixed preparation of a PIPD/PBO polymer, preparation of freshly formed filaments, drawing, solidification, water washing and drying. According to the PIPD/PBO blend fiber prepared by the method, the PIPD polymer is introduced into a PBO fiber, that is to say, a little PIPD is added into a PBO polymer matrix. The wettability and bonding performance of the PBO fiber with a resin matrix are improved on the premise that the excellent mechanical property, high-temperature resistance and flame resistance of the PBO fiber are not reduced.

The invention relates to copolyester and application thereof. The copolyester is prepared from diacid and dihydric alcohol through polymerization reaction in the presence of a catalyst. In components of diacid for forming the copolyester, the content of terephthalic acid structural unit is over 90 mol percent; in components of dihydric alcohol for forming the copolyester, the content of glycol structural unit is 70 to 99 mol percent, the content of aliphatic diol structural unit is 1 to 30 mol percent; and the content of antimony element is less than or equal to 5ppm in based on the total weight of the copolyester. In the polymerization process, a non-antimony catalyst is used and environment-friendly, reduces pollution on spinneret orifices in the spinning process and has environmental safety; the polymer has excellent tone; and the obtained copolyester fibers are high in heat resistance and good in dyeing property.

The polyvinyl chloride-based fiber of the present invention is formed of a vinyl chloride-based resin composition obtained by blending, with respect to (a) 100 parts by weight of a vinyl chloride-based resin, (b) 0.1 parts by weight to 0.6 parts by weight of a hydrotalcite-based thermostabilizer, (c) 0.1 parts by weight to 0.5 parts by weight of β-diketone, (d) 0.2 parts by weight to 0.5 parts by weight of a calcium soap and a zinc soap, (e) 0.7 parts by weight to 1.7 parts by weight of a lubricant, and (f) 0.5 parts by weight to 5 parts by weight of a plasticizer. Thereby, the present invention provides a polyvinyl chloride-based fiber that has an excellent touch feeling as a fiber for hair, excellent transparency and a vivid color tone, and can be obtained by stable melt spinning with less occurrence of filament breakage.

The invention relates to a fibre spinning method for a polyacrylonitrile solution, and mainly solves the technical problems in the prior art that a fibre spinning assembly has poor sealing property, fiber spinning pressure is high, and coagulating bath nascent fibre breakage is more. The invention adopts the technical scheme that the fibre spinning method for the polyacrylonitrile solution comprises the following steps: for a polyacrylonitrile/dimethyl sulfoxide solution with the molecular weight of 80 thousands to 200 thousands and viscosity of 60Pa.s to 120Pa.s, adopting an embedded fibre spinning assembly, filtering by a multi-layer combined filter net, distributing by a distributing plate, extruding by a spinneret plate, entering a coagulating bath, and coagulating to form coagulated filaments. The problems are better solved, and the fibre spinning method can be used in industrial production of polyacrylonitrile-based carbon fiber protofilaments.

The invention relates to the technical field of impregnating agents, and discloses a film forming agent suitable for glass fibers, an impregnating agent comprising the same, and a preparation method and applications of the impregnating agent. The film forming agent comprises emulsified bisphenol A type epoxy resin and polyester type polyurethane. Through the emulsification effect of a surfactant, the interfacial energy of a system is reduced, the stability of epoxy resin emulsion is improved, and thus the function of the epoxy resin emulsion can be better exerted. The polyester polyurethane film forming agent has a large molecular weight and a strong yarn-wrapping performance and easily forms a compact film on the surface of glass fibers, thus the glass fibers are isolated from the external environment, water will not enter the cracks of the glass fibers, the elasticity and wear resistant performance of yarns are improved, the anti-fatigue performance of yarns is strengthened, at the same time, the bundling force is high, and the phenomenon of yarns such as natural draping, non-uniform tension force, and the like, is effectively relieved.

The invention discloses a closure gap bed protection method by using nylon net bag stone ballast and relates to a reservoir or coast reclamation work closure gap ballast method. A nylon net bag stone filling method is adopted. After nylon net bag stones are shipped and transferred, the nylon net bag stones are lifted and placed through a construction vessel. The closure gap bed protection method by using nylon net bag stone ballast is characterized in that the length of each side of each mesh of each nylon net bag is 20cm, phi 16mm polypropylene nylon ropes are used for knitting a circle with radius being 7m and the edge of the circle is serially connected for a turn by using phi 22mm polypropylene nylon ropes; the nylon net bag is placed in a 40m<3> filling bucket for filling block stones, the grain size of the block stones is required to be larger than the length of each side of the mesh of the nylon net bag and 10t of block stones are filled into each nylon net bag; before underground lifting and placing, six nylon net bags with 10t stones respectively are combined into a group of nylon net bags with 60t stones, and adjacent nylon net bags are serially and integrally connected by using phi 16mm polypropylene nylon ropes; and the construction vessel conducts uncoupling for underground placing through positioning according to the determined position, and during underground placing, the nylon net bags are closely placed in a staggered way to ensure close contact.

The invention relates to a heavy-denier-yarn spinning technology of a semi-continuous and high-speed spinning machine, and belongs to the technical field of spinning of the semi-continuous and high-speed spinning machine. The technology comprises the steps of glue supplying, thread-line forming, spinning and winding. The spinning is finished through the spinning device, the spinning device comprises three spinning rollers which are transversely arranged relative to an operation face of a spinning surface, the three spinning rollers are respectively a drafting roller, a solidifying roller and a disacidifying roller, thread-lines sequentially surround the drafting roller, the solidifying roller and the disacidifying roller, and the drafting, the solidifying and the disacidifying in the spinning steps are finished under the rotation of the spinning rollers. The heavy-denier-yarn spinning technology of the semi-continuous and high-speed spinning machine solves the problems that due to the fact that response of thread-lines of a semi-continuous spinning machine in the prior art is insufficient, the spinning speed can not be accelerated, and the production efficiency and the product quality can not be improved at the same time; by changing the arrangement direction of the spinning rollers, the thread-lines can walk a longer distance while the spinning speed of the spinning machine is accelerated and structures of other parts of original equipment are not changed, the thread-lines and acid bath react more fully, and the production efficiency and the product efficiency can be improved at the same time.