302 results about "Fiber strength" patented technology

The invention discloses a preparation method of super-drafted carbon fibers, carbon fibers and application, and relates to the technical field of inorganic materials. The method comprises the following steps: preparing a spinning solution containing 10-40wt% of polyacrylonitrile; 2, 4, 6-triaminopyrimidine and barbituric acid are added into the spinning solution, the total amount of 2, 4, 6-triaminopyrimidine and barbituric acid accounts for 1-20 wt% of polyacrylonitrile, and a spinning solution is obtained; carrying out dry spray preforming on the spinning stock solution, then putting the spinning stock solution into a coagulating bath solution at 0-10 DEG C, and carrying out low-temperature coagulating bath treatment at a draw ratio of 1-10 to prepare nascent fibers; and preparing the nascent fiber into a precursor, and preparing the precursor into the carbon fiber through pre-oxidation and carbonization processes. By adding the supramolecular gel accelerator, the spinning stock solution can be rapidly gelated in a coagulating bath, and then high-multiple drafting can be applied to nascent fibers. The internal graphite structure of the carbon fiber prepared by the super-drafting gel spinning technology is perfect, the orientation is good, the defects are reduced, and the fiber strength is improved.

The preparation method of the antibacterial polyester fiber comprises the following steps: firstly, reacting a cationic antibacterial agent with a terminal carboxyl group with 4-sulfobenzoic acid monopotassium salt to obtain a high-temperature-resistant polymerizable cationic antibacterial agent; then taking purified terephthalic acid, a high-temperature-resistant polymerizable cationic antibacterial agent and ethylene glycol as raw materials, adding an auxiliary agent trimethyl phosphate and a catalyst to prepare uniform slurry, and adding the uniform slurry into an esterification reaction kettle; entering a polycondensation stage after esterification is finished, filling nitrogen after reaction is finished, pressurizing, discharging, and performing underwater granulation to obtain antibacterial polyester chips; then, the antibacterial polyester chips are dried until the water content is lower than 30 ppm, and the antibacterial polyester fibers are obtained through the melt extrusion spinning step; the fiber strength of the prepared antibacterial polyester fiber is larger than or equal to 2.8 cN / dtex, the antibacterial rate meets the AAA grade standard, and the antibacterial polyester fiber has good strength and is wide in application range.

A method for preparing direct melt-spun high-viscosity PBAT / low-viscosity PET two-component elastic fiber and a high-viscosity PBAT polymerization reactor. This method uses two production lines respectively used to produce a high-viscosity PBT melt and a low-viscosity PET melt, which are then spun. The high-viscosity PBAT production line comprises a first esterification reactor, a second esterification reactor, a first prepolymerization reactor, a second prepolymerization reactor, and a high-viscosity PBAT polymerization reactor. The polymerization reactor is designed with a special disc structure in a parallel two-shaft disc reactor, and the two shafts are rotated in opposite directions, improving the devolatilization effect and self-cleaning, significantly increasing the viscosity. By using this method, the cost is low and the production capacity is high, the process flow is shortened, the fiber strength can reach 2.55˜2.85 cN / dtex, the crimp shrinkage rate can reach 25%˜60%, and the crimp stability can reach 58%˜70%.

The present invention relates to the field of fibers, and in particular, to a preparation method for a protein composite fiber. The preparation method comprises spinning, pretreatment, surface treatment, preparation of modified mineral powder, loading, mixing and crosslinking. A pretreated nascent fiber is immersed in a protein composite solution to be in full contact with modified extract mineral powder and a soluble protein, and a crosslinking reaction is carried out; the structure of the dried fiber is more compact; the extract and the soluble protein are more stable in the fiber while the fiber strength is improved; and the loss rate is less than 1% after washing for 50 times. The protein composite fiber prepared by the present invention is skin-friendly and soft, has good moisture absorption and moisturizing effects, and is rich in amino acid and protein, wherein the content of the protein is up to about 12%. Moreover, in the present invention, a common fiber is used as a base material, thereby achieving natural antibacterial, anti-oxidation and deodorizing effects while endowing fibers such as viscose, acrylic fibers, polyester, chinlon, vinylon, and polypropylene fibers with the advantages of a natural protein on the basis of ensuring excellent properties of the base material itself, and thus the range of application is wider.

The invention discloses a cationic antibacterial flame-retardant fiber and a preparation method thereof, the cationic antibacterial flame-retardant fiber is formed by composite spinning of a bi-component modified material, the cross section of the fiber is of a skin-core structure, and both a skin layer material and a core layer material adopt an in-situ copolymerization method. The skin layer material is the prepared high-temperature-resistant polymerizable cationic antibacterial agent, and copolymerization modified polyester with good spinnability and high antibacterial activity is obtained after copolymerization reaction. And the core layer is common phosphorus flame-retardant polyester. The cationic antibacterial flame-retardant fiber is prepared through bi-component composite spinning. The fiber strength of the cationic antibacterial flame-retardant polyester fiber prepared by the method is greater than or equal to 2.8 cN / dtex, the limit oxygen index LOI is greater than or equal to 29%, and the antibacterial rate meets the AAA level standard. The preparation method is simple, convenient in raw material source and easy for industrial production.

The invention provides a preparation method of a PA-PLA (polyamide-polylactic acid) bi-component composite fiber, which comprises the following steps: a) mixing inorganic nano powder, PA slices and a dispersing agent, and carrying out melt extrusion granulation to obtain antibacterial master batch; b) mixing the antibacterial master batch obtained in the step a) with PA slices to obtain modified PA slices; and c) mixing the modified PA slice obtained in the step b) with the PLA slice, and carrying out melt spinning to obtain the PA-PLA bi-component composite fiber. Compared with the prior art, the preparation method provided by the invention has the advantages that the PA slices and the PLA slices are adopted as main raw materials, the overall better interaction is realized through a melt spinning process, the PA and PLA bi-component composite fiber is prepared, the anti-mite and antibacterial effects of the polylactic acid fiber are exerted, the strength and durability of the fiber are ensured, and the preparation method is simple and convenient. Moreover, the problem of polylactic acid dyeing is solved to a certain extent, and polylactic acid is used as a natural bacteriostatic auxiliary material.

The invention discloses an SNP (Single Nucleotide Polymorphism) molecular marker for identifying upland cotton fiber strength character and application thereof, and belongs to the technical field of plant molecular biology. The invention discloses an SNP (Single Nucleotide Polymorphism) molecular marker for identifying upland cotton fiber strength character, which comprises two SNP molecular marker sites which are both positioned on an A10 chromosome of an upland cotton genome. The method has the characteristics of simplicity in operation, accurate result, convenience in repetition and the like, is suitable for screening upland cotton germplasm resources with different fiber strengths, identifies excellent sites with potential application values for molecular marker-assisted selective breeding, and has a wide application prospect.

The invention relates to an all-cotton four-way stretch fabric and a preparation method thereof, and belongs to the technical field of textile dyeing and finishing. The preparation method comprises the following steps: performing singeing, enzyme desizing, liquid ammonia finishing, loose alkali shrinkage and overfeeding soft heat setting on gray fabric to obtain the all-cotton four-way stretch fabric. The warp-wise and weft-wise shrinkage rates of the prepared four-way stretch fabric are-3.0%-0%, the warp-wise elastic elongation rate is 12%-15%, the weft-wise elastic elongation rate is 12%-18%, and the elastic residual elongation rate is smaller than or equal to 8%; obvious warp and weft elasticity can be achieved without elastic fibers, the problems that elastic fabrics such as spandex core-spun yarn fabrics are complex to manufacture, unstable in fabric size and the like are solved, the warp and weft elasticity is obvious, the size stability is good, the hand feeling is soft, and the price is low; the preparation method is simple, does not need equipment transformation, is easy to operate and does not damage fiber strength.

The invention discloses an AI parameter optimization control method and system in a melt extrusion process of regenerated polyester, and relates to the technical field of material processing. Comprising the following steps: S1, carrying out data fusion on the spectral data, the imaging data and the process parameter time sequence data to obtain fusion features; s2, constructing a hybrid model through a physical information neural network and a meta-learning hybrid model, and determining initial process parameters according to the fusion features; and S3, a reward function is constructed through the fiber strength, the unit energy consumption and the equipment wear rate, the initial process parameters are corrected according to the reward function, and the corrected process parameters are obtained. According to the method, high-dimensional feature expression is constructed through three-dimensional space-time-spectrum tensor fusion, so that the isomerism of raw material characteristics can be covered, meanwhile, space-spectrum relevance can be dynamically captured through node edge weights, and then the prediction precision of impurity distribution and melt flow is improved.

The invention relates to the technical field of nano materials, and discloses a preparation method of semi-implanted nano-structure carbon fibers based on dry-jet wet spinning, which comprises the following steps: connecting one pole of a high-voltage direct-current electric field into a spinneret plate of spinning equipment, so that a polyacrylonitrile spinning solution carries sufficient charges out of the spinneret plate and enters a gas phase layer required by a dry-jet wet spinning process; the method comprises the following steps: performing gas-phase dispersion on a nano material to be coated by using a plasma method, connecting a used dispersion nozzle to another electrode of a high-voltage direct-current electric field, and forming a space electric field which is enough for polarization torsion of an unbalanced nano particle monomer on a gas-phase layer part; the nano particle monomer is polarized and twisted under the action of a space electric field, is attracted by surface charges of the polyacrylonitrile precursor and is finally adsorbed to the surface of the polyacrylonitrile precursor, so that a part of nano particles entering the polyacrylonitrile precursor are positioned within the surface of the fiber, and the other part of the nano particles are positioned outside the surface of the fiber; the specific internal and external proportion is determined according to the final requirements on the carbon fiber strength and the interface strength.

The invention belongs to the technical field of fiber strength testing equipment, and particularly discloses synthetic fiber strength tensile testing equipment and a testing method thereof.The synthetic fiber strength tensile testing equipment comprises a fiber tension tester, a mounting seat is fixedly mounted at the upper end of one side of the fiber tension tester, and a sealing assembly is arranged on the upper side of the mounting seat; a lifting assembly is arranged at the position, close to the rear side of the mounting base, of the inner side of the fiber tension tester, an air inlet assembly is arranged on the mounting base and the lifting assembly, a fixing assembly is arranged on the lower side of the air inlet assembly, and a water tank box is arranged at the position, corresponding to the mounting base, in the lower side of the fiber tension tester. Through overall cooperative use, the synthetic fiber strip is stretched in a locked space, fiber scraps generated when the synthetic fiber strip is stretched or broken by the lifting assembly are prevented from flying randomly, and meanwhile, the strength attenuation rates of different environments in a test scene are simulated.

The invention discloses a pretreatment method for recycling carbon fibers through pyrolysis, which comprises the following steps: dipping a fiber reinforced composite material in an ethanol solution of zinc acetate, and then cleaning and drying; carrying out high-temperature pyrolysis on the dried material in an inert atmosphere; after high-temperature pyrolysis, in-situ oxidation is carried out along with a furnace, air is introduced at high temperature for oxidation to remove semicoke, surface activation is carried out, and the recycled fibers are prepared through cleaning and drying. According to the method, the fiber reinforced composite material to be treated is soaked in the ethanol solution of zinc acetate, and compared with the method that the fiber reinforced composite material is soaked in ZnCl2 and an acetic acid solution, the fiber treatment effect is more remarkable; according to the invention, the pyrolysis reaction temperature can be reduced by 30-50 DEG C; the strength loss of the oxidized fiber is within 10%; the O / C phase is more than 70% compared with the original fiber.

The invention provides a waste PET lining cloth grading alcoholysis and in-situ polymerization regeneration method, and relates to the technical field of waste textile recycling, and the method comprises the following steps: adopting a near infrared spectrum combined AI image identification technology to realize waste PET lining cloth material classification, and removing pollutants through low temperature plasma-biological enzyme synergistic cleaning; putting the pretreated PET fragments into three-stage series reaction kettles, and dynamically adjusting the temperature and the catalyst concentration of each stage of reaction kettle through a control algorithm to realize PET depolymerization degree gradient control; according to the method, the graded alcoholysis and in-situ polymerization synergistic technology is adopted, so that the performance of the waste PET lining cloth regenerated fiber is improved in a leap-over manner, the molecular weight and the fiber strength of the regenerated PET are improved through the three-stage tandem reaction kettle and the control algorithm, and the technical bottlenecks that the strength of a physical method is low and the molecular weight loss of a chemical method is large are broken through; the mechanical property of the regenerated material is obviously improved.

The invention belongs to the technical field of anti-wicking polyester yarns, and particularly relates to an anti-wicking polyester yarn oiling agent as well as a synthesis method, a composition and application thereof. The structural formula of the anti-wicking polyester yarn oiling agent is R-SO2-CH2COOH, wherein R is a perfluoro substituted alkyl group or a partially fluoro substituted alkyl group. The anti-wicking polyester yarn oiling agent is used as a solution preparation of a fluorocarbon anti-wicking agent, the oiling agent, a silicone wax anti-wicking agent and a basic spinning oil agent are prepared into an oiling composition, and after the oiling composition is used for polyester industrial yarn emulsion coating and heating to prepare a finished product, the wicking height of the anti-wicking polyester yarn is remarkably reduced, the fiber strength and the like are not affected, and the anti-wicking polyester yarn has good anti-wicking performance. And the method is suitable for industrial application.

The invention discloses an efficient deinking compound bio-enzyme preparation and application thereof, and belongs to the field of pulping and papermaking. The xylanase and the pectinase are adopted, xylan and pectic substances of paper fibers are destroyed through the synergistic effect of the xylanase and the pectinase, a fiber-ink binding area in paper pulp is hydrolyzed, and removal of ink particles is promoted; one or more of amylase, lipase and cellulase are also adopted, so that the degradation and removal effects of the enzymes on the ink are ensured, and the fiber strength is also improved; the enzyme stabilizer is added, so that the stability of the biological enzyme in the liquid preparation is ensured, and the efficient utilization rate of the deinking agent is realized; and the combination and the dosage ratio of the compound biological enzyme preparation are optimized, so that the deinking effect of the biological enzyme is remarkably improved. The method can improve the problem that the existing biological enzyme method deinking cannot obviously improve the physical properties of the paper, and has the advantages of environmental protection, low pollution and the like compared with a chemical method.

The invention relates to a high-strength collagen casing for boiled sausages and a preparation method of the high-strength collagen casing. Adding ammonium sulfate into a rotating hub, treating the washed split leather in the rotating hub, treating the split leather with citric acid and disodium citrate, and dicing the cow split leather; the cow leather particles and water are prepared into a mixture, the mixture is ground through a high-speed grinding machine, a grinding auxiliary is added during grinding, and the retention rate after grinding is 1t; 5%; the collagen particles swell to form colloid; dispersing with a homogenizer; pumping the collagen colloid into a mixer, and adding a cross-linking agent into the mixer; extruding the mixed colloid by an extruder and then drying; and carrying out spray humidification treatment on the dried casing to adjust the moisture content, so as to obtain a casing winding product. The method has the advantages that effective grinding is carried out under the assistance of a proper grinding aid, so that the fineness of collagen fibers in the collagen grinding preparation process is effectively improved, the grinding frequency can be reduced, the fibers are refined, the strength of the fibers is not damaged, and the comprehensive performance of the casing is improved.

The invention relates to the technical field of fibers, in particular to a controlled-release anti-aging polypropylene fiber and a preparation method thereof. The fiber is prepared from polypropylene homopolymer resin, a reaction type interface layer master batch and a controlled release anti-aging master batch, the reactive interface layer master batch is formed by reacting and extruding maleic anhydride modified polypropylene and 3-aminopropyl terminated polydimethylsiloxane, so that the interface compatibility is enhanced; the controlled-release anti-aging master batch contains hydroxyl and peracetylated cyclodextrin grafted siloxane carriers, and an ultraviolet absorbent, a light stabilizer and an antioxidant are included, so that the controlled release of an anti-aging agent is realized. The preparation method comprises the steps of master batch preparation, final mixing granulation, melt spinning and drafting setting. The fiber strength is remarkably improved, the boiling water shrinkage rate is reduced, the strength retention rate after ultraviolet aging reaches 93% or above, the yellow index change is small, and the outdoor service life is prolonged.

The invention relates to a blended yarn and a preparation method thereof, the blended yarn comprises a three-layer composite structure: a surface layer comprises a single-sided single jersey weave woven by 50D-150D supercritical CO2 waterless dyed polyester filament yarn, and the single-sided single jersey weave accounts for 30%-70% of the total mass of the blended yarn; the middle layer comprises lyocell colored spun yarn which is connected through tuck loops, the lyocell colored spun yarn comprises 5wt%-15wt% of black lyocell fibers and 85wt%-95wt% of fibril which are blended, and the surface of the lyocell colored spun yarn is coated with a chitosan / sodium alginate ion cross-linked composite layer; the inner layer comprises looped pile weaves woven by lyocell colored spun yarns, the looped pile weaves are subjected to crosslinking treatment through a CaCl2 solution to form a calcium alginate flame-retardant layer, and the surface resistivity is smaller than or equal to 1 * 10 < 9 > omega.cm. The blended yarn provided by the invention is self-assembled through chitosan / sodium alginate ions, so that flame retardance, antibacterial property and antistatic property are synchronously realized; the water consumption is reduced by supercritical CO2 dyeing, and the fiber strength is protected by low-temperature setting.

The invention relates to a jade cool sense fiber and a preparation method thereof.In the preparation process of the jade cool sense fiber, ferroferric oxide is deposited on the surface of jade powder to form high-heat-conduction particles, in the spinning process, a uniform magnetic field is arranged under a spinning opening to enable the high-heat-conduction particles to be arranged in the fiber in an oriented mode, and the high-heat-conduction particles are formed; therefore, a large number of heat-conducting passages are formed inside the fiber. On the premise that the use amount of jade is not increased and the strength of the fiber is not influenced, the fiber has an excellent instant cool feeling effect.

The invention discloses a heat stabilizer, an industrial yarn heat-resistant agent master batch and a preparation method thereof, and a spinning method for modifying polyamide by using the master batch. The heat stabilizer comprises the following components in parts by mass: 10-20 parts of an organic hybrid copper compound containing an amido bond or an amido group or / and 5-15 parts of an inorganic copper compound, and 25-50 parts of a hindered amine light stabilizer containing an amido bond or an amido group, the thermal decomposition temperature of the phosphite ester antioxidant is higher than the spinning processing temperature; the hindered phenol antioxidant is 10-20 parts by mass; the components are compounded in proportion. The heat stability of the polyamide fiber can be improved, the heat resistance and breaking strength retention rate of the fiber are improved, the fiber strength is improved, the spinning performance is improved by improving the stability of the polyamide melt, the end breakage rate in the spinning process is reduced, and the melt pressure is more stable.

The invention relates to the technical field of polypropylene fibers, in particular to a high-strength polypropylene fiber and a preparation method thereof. The problems that in the prior art, polypropylene fibers are low in strength and poor in temperature resistance are solved. The preparation method comprises the following steps: respectively prefabricating master batches through silane coupling agent modified nano titanium dioxide and carboxylated multi-walled carbon nanotubes, carrying out melt blending on the master batches, isotactic polypropylene, ultra-high molecular weight polypropylene, a liquid crystal polymer, a beta-nucleating agent and the like, and combining a double-region cooling process under high-speed spinning and two-stage temperature difference drafting to obtain the high-strength polypropylene fiber. According to the method, hierarchical dispersion and interface strengthening of nano components in a polypropylene matrix are achieved, the molecular chain orientation degree and crystallization regularity of the fiber are remarkably improved while good processability is maintained, and finally the performance of the polypropylene fiber is greatly improved.

The present invention discloses a high thermal shock resistance ceramic material and a preparation method thereof, which comprise the following raw materials in parts by weight: 100 parts of alumina powder, 3 - 18 parts of pretreated mullite fiber, 2 - 8 parts of binder, 2 - 5 parts of dispersant, and 2 - 8 parts of mineralizer, wherein the mineralizer is composed of 1 - 4 parts of aluminum fluoride and 1 - 4 parts of magnesium fluoride. By pretreating the mullite fiber, a low-expansion composite fiber component is formed at high temperature, and a mineralizer is introduced to stabilize the fiber strength and structure at high temperature. The alumina composite granulated powder is prepared by a spray granulation process. The mullite fiber forms a network structure in the ceramic material and has a smaller thermal expansion coefficient, effectively absorbing thermal stress, so that the ceramic material does not crack when cooled to room temperature after heating and can withstand a higher temperature change, effectively improving the thermal shock resistance of the ceramic material. At the same time, the alumina powder as the main component ensures high hardness and strength, and the addition of the mullite fiber improves the toughness and impact resistance of the material.

The invention discloses a polyester blended fabric with anti-pilling performance and a preparation method of the polyester blended fabric, and belongs to the technical field of after-finishing of polyester blended fabrics. The problem that the anti-pilling performance of the polyester blended fabric is poor is solved. The polyester blended fabric is soaked in a polydopamine solution, so that charge distribution, roughness and surface area of the surface of the polyester fiber are increased, then fiber surface modification treatment is carried out in a solution containing sodium bicarbonate, urea and sodium chloride, molecular chains of the polyester fiber are swelled by utilizing the urea and the sodium chloride, and the polyester fiber is formed. The surface area of the polyester fiber is further increased, and the orientation degree is reduced, so that bicarbonate radical ions fully permeate into the polyester fiber, the bicarbonate radical ions react with the polyester fiber more easily, the glass transition temperature of the polyester fiber is reduced, the polyester fiber is partially hydrolyzed, and finally the strength of the polyester fiber is reduced, and the surface becomes rough; the anti-pilling performance of the polyester blended fabric is improved under the effects that the fiber strength is reduced and the friction coefficient is increased.

A use of a cotton fiber strength trait-associated GhEIF5A gene. In tetraploid Gossypium hirsutum TM-1, the cotton fiber strength trait-associated GhEIF5A gene has a cDNA sequence of SEQ ID NO: 1 and a genome sequence of SEQ ID NO: 2; the GhEIF5A gene is regulated by a neighboring SNP site, and a base at the SNP site is mutated from T to C; and the fiber strength of the mutated genotype is significantly higher than that of a wild-type genotype. The gene has important research value and application prospects in efficiently identifying high-fiber-strength Gossypium hirsutum varieties, improving cotton quality traits, and breeding novel high-fiber-strength cotton varieties.

The invention relates to the technical field of strength detection, and discloses a textile flame-retardant fiber strength detection device which comprises a testing machine main body and clamps, a group of symmetrically arranged base plates are arranged between the two clamps, upper clamping blocks are arranged on the two sides of the base plate located at the upper end of the testing machine main body, and lower clamping blocks are arranged on the two sides of the base plate located at the lower end of the testing machine main body. The upper clamping block and the lower clamping block are symmetrically distributed, positioning plates are fixedly connected to the two ends of the base plate, and sliding grooves are formed in the two sides of each positioning plate. According to the textile flame-retardant fiber strength detection device, when the end part of a sample is clamped and fixed, one end of the sample firstly passes through the space between the base plate and the upper clamping block, and then the sample passes through the space between the base plate and the other upper clamping block, so that the base plate is wrapped by the sample, and the strength of the flame-retardant fiber is detected by combining the design that the two ends of the base plate are arc-shaped and the diameters are gradually changed; the clamping force is uniformly distributed along the axial direction of the fiber, so that the stress concentration is avoided, the slippage of the sample can be prevented, the intrinsic fracture of a non-material can be reduced, and the detection precision is improved.

The invention discloses a modified chinlon chemical fiber strength detection device based on an intelligent sensor, and relates to the technical field of material science and engineering. Through the arrangement of the detection device, after the two ends of a chinlon chemical fiber are fixed respectively, the chinlon chemical fiber is fixed through a pressing plate and a winding cylinder, and skid resistance is achieved; the chinlon chemical fibers can be kept stable in the detection process, repeated operation caused by sliding is reduced, the detection efficiency is improved, after the chinlon chemical fibers are fixed, the chinlon chemical fibers are placed into the inner wall of the positioning cylinder to be positioned on the upper side and the lower side, otherwise, the chinlon chemical fibers possibly deform or break in the unexpected direction, and the detection accuracy is improved. The strength performance of the chinlon chemical fibers under the normal use condition cannot be truly reflected, after the chinlon chemical fibers on the two sides are fixed, the driving rod rotates to enable the mounting bases on the upper side and the lower side to move back to back, the chinlon chemical fibers are detected, and data are fed back to the control panel in real time through the pressure sensor.

The invention provides an anti-ultraviolet aging high-strength and high-modulus PBO (poly (p-phenylene benzobisoxazole)) fiber and a preparation method thereof. The strength of the PBO fiber is 31.6-32.3 cN / dtex. The strength retention rate is greater than or equal to 62.5%, and preferably, the strength retention rate is 62.5-90.5%. The intermittent pre-polymerization process is used for intermittently preparing a pre-polymerized material, starting from a material storage kettle, continuously conveying the material, defoaming, pre-filtering, feeding the material into a final polymerization system, adding an ultraviolet light absorber before the material enters the final polymerization system for blending modification, and then spinning, washing, oiling, drying and densifying to obtain the anti-ultraviolet aging fiber. The PBO spinning solution is high in viscosity and is easy to block equipment and pipelines, so that equipment such as a pre-polymerization kettle, a middle kettle, a defoaming kettle and a double-screw extruder should be compactly arranged in space arrangement. Meanwhile, the reaction time and the reaction temperature need to be strictly controlled, the intrinsic viscosity of materials in each process is guaranteed, the process stability is guaranteed, and the anti-ultraviolet aging fiber can be obtained.

The present application relates to the technical field of cotton fiber detection. A kind of intelligent beam fiber strength tester, including cabinet, industrial computer, sliding table module is provided in cabinet, sectional material frame, air cylinder, beam fiber clamping mechanism, stepper motor, lever type pull rod, force sensor, displacement sensor, resistance detection plate, A / D acquisition conversion module;The application method of the tester, steps include: under normal environmental conditions, beam fiber clamping mechanism clamps fiber sample, obtains moisture regain R by resistance moisture regain conversion program conversion;Stepper motor drives lever type pull rod to stretch sample, data is made into the tensile curve F (e) of beam fiber sample-e by industrial computer, and machine learning model predicts the corrected breaking strength value and elongation rate.The present application is simple and reasonable in structure, can realize the quick and accurate measurement of cotton beam fiber breaking strength value and breaking elongation rate under different humidity conditions in normal environment, is high in informatization degree, economic and practical, and improves the accuracy of test result.

The present invention discloses a method for preparing a C / C-SiC composite material by low-temperature reactive infiltration of a silicon-nickel alloy. The method comprises the following steps: uniformly pressing silicon powder and nickel powder into a mold by mechanical stirring and grinding; heating the pressed block to form a silicon-nickel alloy, and crushing the alloy block into alloy particles; laying a porous C / C composite material on top of the silicon-nickel alloy particles, and reactive infiltration in a vacuum furnace in a vacuum atmosphere or an Ar or N2 inert atmosphere to obtain a C / C-SiC composite material. The silicon-nickel alloy is used to address the limitations of the C / C-SiC composite material prepared by the pure silicon reactive infiltration process, such as low strength, high reactive infiltration temperature, and damage to fiber strength. The present invention has the advantages of significantly reducing the reactive infiltration process temperature, improving the uniformity of SiC phase distribution in the matrix, and improving the mechanical properties of the composite material, such as flexural strength and fracture toughness.

The invention provides a precursor for high-strength and high-modulus polyacrylonitrile carbon fibers as well as a preparation method and application of the precursor, and mainly solves the problems of many pre-oxidized broken filaments and low strength, modulus and elongation of carbon fibers in the prior art. According to the method, wet spinning is adopted, and the method comprises the step of drying and densifying polyacrylonitrile nascent fibers obtained through wet spinning, drying and densifying at least comprise eight hot rollers, and the light transmittance ratio of tows between any two hot rollers to previous adjacent tows is 0.9-2.0. The method can be used for industrial production of the polyacrylonitrile carbon fiber precursor.