24 results about "Fiber strength" patented technology

This invention relates to the field of textile materials technology, and proposes a fiber for headscarves and its preparation method. The fiber for headscarves comprises the following components by weight: 100 parts PET resin, 2-4 parts modified graphene oxide, 8-10 parts toughening agent, and 0.5-1 parts antioxidant; the modified graphene oxide comprises the following raw materials by weight: 2-5 parts gallic acid fatty ester and 1 part graphene oxide. This technical solution solves the problem of low strength in existing PET fibers for headscarves.

A blended rope is provided having an outer sheath (8) enclosing at least a strength member (7), the strength member (7) having high-strength synthetic fibers, the strength member (7) being a blended strength member (7) formed with a combination of ARAMID fibers and HMPE fibers, the blended strength member comprising a non-homogeneous distribution of the ARAMID and HMPE fibers, wherein the weight ratio of ARAMID to HMPE in the strength member (7) is preferably a minimum of 80:20.

This invention relates to a method for preparing polyacrylonitrile-based high-performance carbon fiber precursor, mainly addressing the problems of high fiber fineness CV value, low strength, and high strength CV value in existing carbon fiber precursors. This invention employs a wet spinning process, using curved rollers in the drying and densification stage. Simultaneously, at 350–450 kPa, the relationship between steam drawing tension and steam drawing ratio satisfies a linear relationship: y = Ax - 50.6 (400 ≤ A ≤ 800, 1 ≤ x ≤ 5). Wherein, y is the steam drawing tension, and x is the steam drawing ratio. The technical solution adopted in this invention effectively solves the problems of high fiber fineness CV value, low strength, and high strength CV value in carbon fiber precursors, and can be used in the industrial production of polyacrylonitrile-based high-performance carbon fiber precursors.

This invention discloses a carbon fiber double-double layup method for a composite material fuselage stringer structure. The stringer is fixed to the inside of the aircraft fuselage cylinder and adopts a carbon fiber double-double layup structure. First, the two angle parameters φ and ψ of the double-double layup are set within the range of 0º-180º and different combinations are made. Then, under a preset bending moment and a preset number of layers, the optimal combination of angle parameters (±φ, ±ψ) is determined by strength calculation. Finally, the double-double layup is repeated in a fixed cycle along the stacking direction according to the determined combination of angle parameters (±φ, ±ψ). This invention can improve the design stiffness and strength of the stringer with the same material usage, or reduce the amount of composite material used with the same stiffness or strength, resulting in high carbon fiber strength utilization and high material utilization rate.

The objective of this invention is to provide a treatment agent for polyester synthetic fibers, which improves the emulsion stability when the treatment agent is prepared as an aqueous dilution, reduces the adhesion of the fiber surface to which the treatment agent has been applied, and suppresses the reduction in fiber strength. The polyester synthetic fiber treatment agent of this invention contains at least 5% by mass of a (poly)oxyalkylene derivative (A), at least 1% by mass of an inorganic acid compound (B), and at least 5% by mass of an organophosphate compound (C). The 1% by mass aqueous dilution of the polyester synthetic fiber treatment agent has a pH of 5.5 or higher and 8.5 or lower at 25°C. The inorganic acid compound (B) is selected from at least one of sulfuric acid, nitric acid, hydrochloric acid, and their salts. The organophosphate compound (C) is selected from at least one of an organophosphate having an alkyl group having 16 or more and 20 or fewer carbon atoms, and their salts.

The present application relates to a kind of method for determining carbon fiber strength based on molecular dynamics, belong to aerospace lightweight composite material design technical field.The present application constructs the method for meeting the interlayer spacing and interlayer crosslinking fragment of actual carbon fiber using molecular dynamics method, and the tensile and compression strength of normal temperature 300K-high temperature 2000K are calculated.Meanwhile, the change trend of experimental and simulation results is extremely high, and it provides strong theoretical basis for the preparation process development and service strength calculation of high-performance carbon fiber.

A polymer composition includes a low ethylene random copolymer that can be used to form a meltspun or spunbond article at high spinning velocities. The polymer composition has a low xylene soluble content, a high crystallinity, or both, while having reduced spin-break at high spinning velocities. The polymer composition also exhibits good fiber tenacity and fabric softness.

This invention discloses a method and apparatus for recycling amine-cured epoxy resin carbon fiber reinforced composite materials. The method utilizes an organic solvent to pretreat the composite material sample through solvent swelling, followed by the use of an in-situ peracetic acid generation system to degrade the epoxy resin matrix, thereby achieving complete recycling of the carbon fibers. The recycling method of this invention operates at a reaction temperature not exceeding 160°C and under normal pressure throughout the entire recycling process, effectively avoiding surface damage and mechanical property impairment to the fibers caused by high-temperature pyrolysis (typically above 500°C) or high-pressure reactions (e.g., supercritical hydrolysis). The carbon fibers recovered using this method retain over 90% of the original fiber tensile strength, exhibiting extremely high reuse value.

The application discloses a polyester fiber high-speed physical spinning forming method and belongs to the technical field of chemical fiber forming. In view of the problems of poor orientation crystallization synergy, uneven radial structure, high breakage rate and the like in the existing high-speed spinning, the method comprises the following steps: after melt extrusion from a spinning plate, the melt is sequentially subjected to multi-stage gradient cooling forming through a slow cooling zone, a quenching zone and a stable cooling zone; the temperature of the slow cooling zone is 180-240 DEG C, so that the melt stream is fully pre-oriented; the quenching zone is divided into a pre-cooling section and a main cooling section, the air speed is gradiently distributed, and a ring blowing or composite cooling mode is adopted; and then the fiber is subjected to bundle oiling and hot roller stretching, and is high-speed wound and formed at 5500-8000 m / min. The application realizes the optimal matching of the time sequence of orientation and crystallization and the spatial homogenization, the prepared fiber has a strength of 5.5-7.5 cN / dtex, the radial structure is uniform, the breakage rate is reduced by more than 90%, and the method has the advantages of high process flexibility, low energy consumption and the like.

The invention belongs to the technical field of oilfield chemistry, and relates to a gas reservoir crack mixed temporary plugging agent and a preparation method thereof. The temporary plugging agent is prepared from the following components in parts by mass: a water-soluble high-molecular polymer, heat-resistant starch, degradable fibers, a strength improver and water, the strength improver is montmorillonite powder wrapped by polyvinyl alcohol. The water-soluble high-molecular polymer is matched with the degradable fibers and the starch particles to be interwoven and connected to form a net-shaped structure, so that the pressure resistance is improved, and the temporary plugging effect is improved; according to the strength improving agent, montmorillonite powder wrapped by polyvinyl alcohol is added, in the process that the temporary plugging agent still flows downwards, the polyvinyl alcohol on the surface of the montmorillonite powder is melted along with decline and temperature rise, so that the montmorillonite powder leaks out and absorbs water again to swell, and the strength of the temporary plugging agent is improved. And montmorillonite powder wrapped by heat-resistant starch-degradable fiber-polyvinyl alcohol is cross-linked to form a rich three-dimensional system structure as a climbing skeleton, so that the temporary plugging agent can temporarily plug cracks at positions needing temporary plugging.

The application provides a grafted copolymerization modified polyester fiber and a preparation method thereof. The preparation method of the grafted copolymerization modified polyester fiber comprises the following steps: S1. adding 2-hydroxy-2-methylphenylpropane-1-ketone and 2-methoxy-4-vinylphenol into an ethanol-water mixed solvent, stirring to obtain a reaction solution; S2. placing polyester fibers in the reaction solution, then irradiating the polyester fibers with ultraviolet light to perform a reaction, washing, and drying to obtain the grafted copolymerization modified polyester fiber. In the application, through the grafting reaction, 2-methoxy-4-vinylphenol with a bulky benzene ring side group of a larger steric hindrance and a hydroxyl group is introduced into the polyester fiber, the molecular chain regularity of the polyester is destroyed, the crystallinity is reduced, the fiber strength is reduced, the fuzz ball is easy to fall off, and the anti-pilling performance of the fiber is improved. Moreover, the reduction of the crystallinity can increase the proportion of the amorphous region, so that the dye is more easily diffused into the fiber, and the dyeing depth is ensured.

This invention relates to the field of flexible pressure sensor technology, and particularly to a flexible pressure sensor based on multi-fabric hybrid weaving and its manufacturing method. Its structure includes skeleton fibers, piezoresistive fibers, a positive electrode sheet, and a negative electrode sheet. Multiple strands of skeleton fibers are woven in the weft direction of the fabric, while multiple strands of skeleton fibers and multiple strands of piezoresistive fibers are interwoven in the warp direction. The positive and negative electrode sheets are connected to the fabric and respectively contact the multiple strands of piezoresistive fibers. The positive and negative electrode sheets are staggered and respectively connected to an external sampler to form a circuit. This invention employs a hybrid weaving structure of piezoresistive and skeleton fibers, which can stably achieve piezoresistive function. Simultaneously, the high strength and excellent creep resistance of the skeleton fibers reinforce the piezoresistive material, sharing the pressure, tensile force, and creep stress borne by the piezoresistive fibers, significantly improving the overall structural strength and product lifespan.

This invention provides a high-performance polyacrylonitrile fiber and its preparation method. The high-performance polyacrylonitrile fiber includes a steam drawing step. In the steam drawing step, the tension of the fiber bundle after steam drawing and the steam drawing pressure satisfy the following relationship: -10x + 4651 ≤ y ≤ -16x + 6976; where x is the steam drawing pressure, x is 150–380 kPa; and y is the tension of the fiber bundle, in cN. The preparation method includes: wet spinning extrusion of polyacrylonitrile dope, coagulation molding, hot water drawing, washing, oiling, drying and densification, steam drawing, steam heat setting, and winding to obtain the high-performance polyacrylonitrile fiber. This invention solves the problems of high fiber strength CV value after steam drawing and high fuzziness during heat setting in the prior art.

The application discloses an InDel molecular marker for synchronously improving fiber strength and lint percentage of cotton and application, and belongs to the field of cotton biotechnology.The InDel molecular marker is located at the 8234514 base of a cotton genome D06 chromosome; the InDel molecular marker is a nucleotide sequence shown in SEQ ID NO.1, and the 101th base of the nucleotide sequence is an insertion or deletion.The InDel marker provided by the application can assist in simultaneously identifying the high and low of fiber strength and lint percentage, and the fiber strength and lint percentage of cotton plants with a genotype of deletion are significantly higher than those of individuals with a genotype of insertion.The molecular marker disclosed by the application has very great application value for identifying comprehensive excellent traits of cotton, and has important significance for accelerating the breeding of new cotton varieties with high quality and high yield and improving the economic benefits of cotton.

This invention relates to the field of fabric technology, specifically to a breathable antibacterial fabric and its preparation process, and sportswear made from this fabric. The preparation process of the breathable antibacterial fabric includes: preparation of a composite antibacterial agent, preparation of multifunctional polyester fibers, amination modification of phenolic lignin, modification treatment of polyacrylonitrile, and preparation of the breathable antibacterial fabric. The breathable antibacterial fabric of this invention consists of inner, middle, and outer layers: the inner layer is a blend of modal and other materials, which is skin-friendly, moisture-wicking, and antibacterial; the middle layer is a polyurethane film layer; the outer layer contains polyacrylonitrile composite fibers, which are antibacterial, crisp, and breathable. A composite antibacterial agent made of chitosan, cysteine, and copper nitrate imparts dual antibacterial properties to the fabric, reducing bacterial resistance. Ethylene treatment enhances the bonding of components, improving wash resistance and antistatic properties; the co-spinning of amination-modified phenolic lignin and polyacrylonitrile increases fiber strength, breathability, and UV resistance. This fabric is suitable for sportswear.

This invention proposes an ultralight yarn to address the problems of poor practicality, high material cost, and easy deformation of existing monofilaments. Using I-shaped PET fibers as raw material, it is prepared through specific spinneret orifices and processes. The monofilament consists of a first horizontal section, a vertical section, and a second horizontal section, with the I-shaped monofilaments interlaced and combined. Different parameters are designed for the length, width, and corner radius of each section. By controlling the angle distribution of the I-shaped spinnerets and optimizing the spinneret parameters, the fiber becomes ultralight and its performance is improved. The I-shaped design disperses stress, heat treatment optimizes performance, and the concentric spinneret orifice distribution ensures quality. This invention achieves lightweight and multifunctionality while maintaining fiber strength and elasticity, resulting in significant economic benefits and broad market prospects.

The invention provides application of a GhMHP1 gene in regulation and control of length and strength of cotton fibers, and belongs to the technical field of biology. The invention provides any one of the following applications of the GhMHP1 gene: regulating and controlling the length of cotton fibers; regulating and controlling the cotton fiber strength; regulating and controlling the micronaire value of the cotton fiber; the content of free fatty acid in the cotton fiber is regulated and controlled. By detecting the fiber quality of the GhMHP1 knockout strain and upland cotton, it is found that the GhMHP1 knockout strain can significantly increase the length and strength of cotton fibers and improve the micronaire value level; by detecting the content of the free fatty acid in the GhMHP1 knockout strain and the upland cotton fiber, it is found that the content of the free fatty acid in the fiber of the GhMHP1 knockout strain is remarkably increased, and the method is of great significance to cultivation of cotton varieties with excellent fiber quality and production practice.

This invention relates to high-performance fibers for antibacterial multilayer composite spunbond nonwoven fabrics and their preparation methods, belonging to the field of nonwoven materials and high-performance fiber modification technology. The high-performance fiber comprises a core-sheath structure, consisting of a sheath component A and a core component B. Sheath component A includes a metallocene polypropylene matrix and a thermo-responsive self-reinforcing micro-integral C dispersed therein. Micro-integral C consists of a core containing a phase change material and a metal-based antibacterial agent, a modulus gradient shell, and a functional corona layer, capable of in-situ chemical bonding with the matrix under ultrasonic triggering. Core component B consists of a hybrid reinforcement system of highly isomeric polypropylene and carbon nanotube nucleating agents. This invention, without introducing external reinforcing materials, achieves a synergistic effect of high fiber strength, high flexibility, and long-lasting antibacterial properties through chemical anchoring and hybrid reinforcement of the microstructure, solving the technical problems of embrittlement during ultrasonic processing and weak interlayer bonding.

The application discloses a low-fouling and high-whiteness oxygen bleaching stabilizer, a preparation method and application thereof, and belongs to the field of textile pretreatment auxiliaries. The technical problem to be solved is that in the continuous pretreatment process, the fouling on the steaming box, guide roller and other equipment is serious, white spots and other defects appear on the fabric, and the product quality and production efficiency are low. The technical solution is that an environmentally-friendly multi-component complex component, controllable adsorption and buffer component, high-molecular dispersing and free radical capturing component, penetration and surface activity adjusting component and water are used to prepare a low-fouling, high-whiteness and high-safety stabilizer system in a scouring and bleaching one-bath process. The system guarantees the stability of hydrogen peroxide, excellent whiteness improvement effect, excellent anti-fouling property and easy cleaning of the fouling, significantly reduces the fiber strength damage, improves the safety of the process, and guarantees the product quality.

This invention discloses a production process for high-strength electronic-grade glass fiber cloth, comprising: opening the fiber of a pre-fabricated fabric and simultaneously performing preliminary desizing to obtain an opened fabric; impregnating the opened fabric roll with an aqueous solution of a combustion-supporting agent and then drying it to obtain a desizing fabric; desizing the desizing fabric in a KH continuous desizing furnace at a desizing temperature of 390-450 degrees Celsius to obtain a desizing fabric; and treating the desizing fabric with a coupling agent to obtain the finished fabric. This high-strength electronic-grade glass fiber cloth production process, through the synergistic process of pre-opening, precise low-concentration combustion-supporting agent impregnation, and rapid desizing within a specific high-temperature range, simultaneously achieves multiple technical effects such as extreme cleanliness, ultra-high production efficiency, lower energy consumption, better fiber strength retention, and improved resin impregnation, overcoming the inherent defects of traditional processes.

This invention discloses a negative ion yarn spinning process. During the transformation of the molten stream into nascent fibers, the strength gradually increases while the temperature gradually decreases. By setting up multiple cooling sections, the cooling air velocity in each section gradually increases vertically downwards. This gradual increase in cooling air velocity, based on the increasing strength of the nascent fibers, ensures cooling efficiency and allows the cooling temperature in each section to gradually decrease vertically downwards, resulting in a uniform temperature reduction of the nascent fibers. Ultimately, while ensuring cooling efficiency, this process avoids or reduces filament breakage. Furthermore, the initial use of a lower cooling air velocity prevents excessive fiber movement and adhesion. This invention also discloses a negative ion yarn spinning device that, while ensuring cooling efficiency, also avoids or reduces filament breakage.

The utility model relates to steel fiber strength detection technical field especially relates to a kind of steel fiber strength detection device.The utility model provides a kind of steel fiber strength detection device which can carry out strength detection to different types of steel fiber, save detection cost, improve detection efficiency.A kind of steel fiber strength detection device, including base, control panel, support frame and first telescopic push rod etc., base front side is connected with control panel, base upper side is connected with support frame, support frame left and right two parts are connected with first telescopic push rod.The utility model when needing to detect the plate made of steel fiber mixture, by clamping plate on fixed frame, then starting second telescopic push rod, push down the lower pressure block, detect plate compressive strength, reach the effect that can carry out strength detection to different types of steel fiber, save detection cost, improve detection efficiency.

This invention discloses a method for preparing raw bamboo fiber based on a performic acid / sodium sulfite composite system. The raw bamboo is treated with a performic acid and sodium sulfite composite system, achieving a lignin removal rate of 97-100% while minimizing damage to the bamboo fiber. The fiber strength after this treatment is significantly increased, making it suitable for textiles and other fields. The product of this invention combines the high-quality qualities of crude bamboo obtained through alkali treatment and redox principles, yielding spinnable raw bamboo monofilaments with a diameter of several hundred micrometers, high degree of delignification, good whiteness, and excellent strength.