40results about How to "Good tensile mechanical properties" patented technology

The invention relates to the field of powder metallurgy technology characterized in that, forming the powder with 200 MPa-500 MPa and feeding into sintering furnace, elevating the temperature to 400-700 deg. C. at the speed of 5-20 deg. C per minutes, heat preserving for 15-120 mins, elevating the temperature to sintering temperature of 1150-1350 deg. C. at the speed of 20-60 deg. C per minutes, heat preserving for 30-120 mins.

The invention relates to an enhanced bi-component nanofiber porous membrane and a preparation method thereof. The porous membrane is a lithium ion battery membrane with two components of polymer resin and polyurethane. The membrane is in a semi-interpenetrating network structure which has a void ratio of 60-80%, and the mechanical property is 2-3 times higher than a single-component porous membrane of polymer resin. The preparation method comprises the steps of: dissolving a polymer resin and polyurethane prepolymer bi-component composition in a solvent, and preparing a nonwoven membrane through an electrospinning technology; and putting the nonwoven membrane at room temperature to make -NCO in the polyurethane prepolymer react with the -OH bond of water in the air to produce polyurethanethrough crosslinking and autopolymerization. In the invention, the nanofiber in the nonwoven membrane binds to form the polymer resin and polyurethane bi-component compound membrane, and the mechanical strength of the fibrous membrane is improved greatly. The method is easy, and the prepared nonwoven membrane maintains the advantages of high void ratio, and good thermal stability of polymer resinof the membrane prepared by using the electrospinning technology, and the membrane has good ion permeability and electrolyte affinity.

The invention in particular relates to a method for improving tensile mechanical property of fibers and belongs to fiber modification technologies. The method comprises the following steps: taking papa-phenylene diisocyanate and ethidene diamine as precursors, and depositing a polyurethane film on the fiber surface by adopting an atomic layer deposition technique. Due to excellent shape preservation of the atomic layer deposition technique, the defects of the original fibers can be effectively reduced, and due to high elasticity of polyurethane, the original fibers can effectively buffer instantaneous mechanical changes in the tensile process, so that the tensile mechanical properties of fibers can be effectively reduced. The preparation method is simple, the deposition process is easy to control, the cost and energy consumption are low, and the method is pollution-free to the ecological environment and suitable for industrial production.

The invention discloses a production process of an aluminum profile for automobile impact energy absorbing components and a produced aluminum profile, relates to the technical field of aluminum and aluminum alloy extrusion machining and heat treatment. The production process comprises the following steps that an aluminum alloy ingot is subjected to uniform annealing treatment, extrusion and quenching treatment, tensile treatment and aging treatment in sequence; then, the aluminum alloy ingot is cooled to 490-525 DEG C after the uniform annealing treatment, and extrusion is carried out again; and the aging treatment includes first, natural aging treatment and then secondary artificial aging treatment, the natural aging treatment time is carried out for 30-60 h, the heat preservation temperature of a first artificial aging stage is 100-120 DEG C, the heat preservation time is 2-3.5 h, the heat preservation temperature of a second artificial aging stage is 150-170 DEG C, and the heat preservation time is 8-12 h. By reasonably designing parameters of extrusion process and heat treatment process, the production process can improve tensile mechanical properties simultaneously without reducing the plasticity, so that the aluminum profile has better compression performance.

The present invention relates to a high-strength, high-modulus, high-elastic polyurethane film preparation method, and belongs to the technical field of film material. The preparation method for the high-strength, high-modulus, high-elastic polyurethane film provided by the invention comprises: putting a polytetrafluoroethylene plate blade coating with a polyurethane solution into coagulating bath mixed by deionized water, ammonium salt, amide linkage-containing organic solvent, acetone, and anionic surfactant with a low relative molecular weight, mechanically stirring the coagulating bath, and carrying out wet forming and drying to obtain the high-strength, high-modulus, high-elastic polyurethane film. The preparation method provided by the invention can enhance breaking strength, Young's modulus and elongation at break of the polyurethane film simultaneously. The breaking strength of the polyurethane film is enhanced by 270-560%, elongation at break is enhanced by 80-280%, and the Young's modulus is enhanced by 50-270%. The preparation method provided by the invention is simple in processing equipment, low in cost, and pollution-free to ecological environment, high in controllability, and has a great application prospect.

The invention relates to a method for enhancing stretching mechanical property of polyurethane fiber, which belongs to the technical field of fibrous material. The method is characterized in that the polyurethane fiber is obtained through polyurethane fiber pretreatment, polyurethane fiber low temperature corona irradiation modification, preparation of a modification solution, embedding of ammonium salt molecules in polyurethane fiber, cleaning of ammonium salt molecules-imbedded polyurethane fiber, micro drawing and heat fixing. The polyurethane fiber is modified after moulding, polyurethane fiber breaking tenacity is realized, young modulus and fracture elongation are simultaneously enhanced, the breaking tenacity of the prepared polyurethane fiber is increased by 60-150%, fracture elongation is increased by 70-120%, and the young modulus is increased by 30-80%. The preparation method has the simple equipment, low cost, no pollution on ecological environment, high controllability and large application prospect.

The invention provides antibacterial medical hemostasis absorbent cotton gauze, which consists of medicine dressing and a tissue material carrying the medicine dressing, wherein the medicine dressingis prepared from traditional Chinese medicine and western medicine; the tissue material carrying the medicine dressing is blended by scleroprotein fiber and cotton fiber. The hemostasis and the antibacterial effects are integrated; the obvious effects are achieved on abnormal bleeding in operations of lung, liver, pancreas, adrenal gland and the like, the bleeding except for obstetrics departmentand postpartum hemorrhage, urinary tract bleeding and the like; in addition, the antibacterial medical hemostasis absorbent cotton gauze can be used under the conditions of great and deep wound and great bleeding quantity; the hemostasis is fast; the wound surface wound recovery is facilitated; meanwhile, the antibacterial spectrum is wide; the sterilization power is strong; the action is fast; the effectiveness can also be achieved on pseudomonas aeruginosa, klebsiella, escherichia coli, enterobacter, staphylococcus, mycoplasma and chlamydia; in addition, good effects are achieved on trimethoprim drug resistant bacteria, penicillin drug resistant staphylococcus aureus andtylosin or tiamulin drug resistant mycoplasma.

The invention discloses a quaternary hypoeutectic high-entropy alloy excellent in strength and plasticity match. The quaternary hypoeutectic high-entropy alloy consists of a component of AlxCoyCrzNiw,wherein x, y, z and w respectively are molar ratios of corresponding elements, the molar ratios meet the relationships: 16>=x>=12, 30>=y>=26, 30>=z>=26, and 32>=w>=28. The quaternary hypoeutectic high-entropy alloy is of hypoeutectic structure, and excellent in strength and plasticity match. Simultaneously, the invention further provides a preparation method of the quaternary hypoeutectic high-entropy alloy. The preparation method includes: first, removing oxide skin from the elementary metals, weighing and mixing the elementary metals according to the molar ratios to obtain a mixture, placing the mixture in a high vacuum non-self-consuming arc melting furnace, performing electric arc melting in vacuum under argon protection, obtaining an alloy solution, stirring and cooling the alloy solution, obtaining an alloy ingot, repeating smelting for four times to obtain a high-entropy alloy, removing oxide skin from the obtained high-entropy alloy, performing ultrasonic cleaning twice by using ethyl alcohol, placing a clean alloy ingot in a high vacuum arc smelting rollover casting and centrifugation casting system, pouring molten alloy obtained after remelting into a copper mold, and then obtaining a high-entropy alloy test sample Al14Co28Cr28Ni30. The preparation method is simple, safe and stable.

The invention relates to a preparation method for a bacteria-resistant medical gauze. The raw material of the medical gauze is formed by chitosan fibers and cotton fibers; and the weight ratio of the chitosan fibers and the cotton fibers is 55 to 65 to 35 to 45. The bacteria-resistant medical gauze prepared by the method has traditional functions of bacteria elimination and prevention and cleaning and can further improve blood circulation, promote metabolism, remove fatigue and inducting resuscitation and caring brain; the gauze has smooth hand feeling and gentleness as well as comfort; the medical gauze is moisture-absorptive and ventilating and has comfortable feeling; and the gauze is a novel bacteria-resistant and mite-removal medical gauze.

The invention discloses a method for producing fibers used for twisted threads. According to the method, MMWPE resin, HDPE resin, nanometer SiO2, an auxiliary agent, an agitator, a yarn separating machine, a yarn withdrawal machine, a single screw extruder and a twice-drafting electrical heating drafting machine are adopted, and the method is characterized in that the MMWPE resin, the HDPE resin, the nanometer SiO2 and the auxiliary agent are stirred to be uniform with the agitator, nano-modified compound granules are obtained, the nano-modified compound granules are melt and extruded through the single screw extruder, newly-generated yarn obtained through the extrusion is subjected to cooling and pre-drafting through a cooling water tank and a first drafting roller, pre-drafted yarn is subjected to hot drafting for twice through a high temperature first drafting water bath and a second drafting roller as well as a high temperature second drafting water bath and a third drafting roller, and after the drafting, fiber tows are reeled through the yarn withdrawal machine which uses a moment electric motor; the fiber tows are separated into the fibers used for the twisted threads through the yarn separating machine under the yarn separation tensile force, and the yarn separation tensile force is controlled to be 12%-21% of the fiber breaking force.

The invention provides a high-temperature-boiling-resistant low-temperature-toughness polyolefin plastic as well as a preparation method and application thereof. The high-temperature-boiling-resistantlow-temperature-toughness polyolefin plastic is prepared from polypropylene and polyethylene, and Nalkyl maleimide grafted polyethylene is added as a compatilizer, so that not only is the compatibility of the polypropylene and the polyethylene improved, but also the heat resistance of the material can be improved by the Nalkyl maleimide; and in addition, a bismaleimide-modified polysiloxane copolymerized polyurethane elastomer and polyethylene are added to synergistically toughen the polypropylene, and meanwhile, the heat resistance of the material can be improved. According to the high-temperature-boiling-resistant low-temperature-toughness polyolefin plastic provided by the invention, the polypropylene is used as a continuous phase, the polyethylene is used as a dispersion phase, and asystem penetrated by a polysiloxane copolymerized polyurethane network does not deform after being boiled at the high temperature of 121 DEG C for 30 minutes, does not fall off and is not damaged at the low temperature of -30 DEG C and has excellent tensile and bending properties.

The invention discloses an ultrahigh-damping and high-strength metal-based composite material and a preparation method thereof, and relates to the technical field of composite materials. The composite material is composed of Cu-11.9Al-2.5Mn, 1.0 wt.% of a Cu51Zr14 nucleating agent and 0.05 wt.%-0.15 wt.% of multi-layer graphene, the room temperature damping of the composite material is 0.0444-0.0979, the tensile strength is 750.36 MPa-913.37 MPa, and the percentage elongation after fracture is 8.34%-13.48%. The composite material can better meet application requirements in the technical field of damping, and noise reduction. According to the preparation method of the material, the intrinsic high-damping reinforced-phase multi-layer graphene of a lamellar structure is added into a CuAlMn shape memory alloy by using a vacuum hot rolling technology for the first time, overcoming the defects that in the prior art, the damping improvement degree is limited, the process is complicated; the production period is long, and the like.

The invention discloses a high-strength and high-toughness Al-Cu-(Al-Ti-Nb-B) alloy and a preparation method thereof. The ratio of Ti to Nb of an Al-Ti-Nb-B intermediate alloy is determined to be 1: 1 according to thermodynamic calculation, the Al-Ti-Nb-B intermediate alloy is prepared by adopting a villiaumite reaction method, and the Al-Ti-Nb-B intermediate alloy is reprocessed by adopting a hot extrusion method. The Al-Cu-(Al-Ti-Nb-B) alloy disclosed by the invention is prepared from the following components in percentage by mass: 5% of Cu, 0.005-0.0125% of Ti, 0.005-0.0125% of Nb, 0.001-0.0025% of B and the balance of Al; and the phase of the alloy comprises one or more of NbAl3, TiAl3, TiB2 and NbB2 refining and strengthening phases, and the balance of Al2Cu and alpha-Al phase. The preparation method comprises the following steps: preparing an Al-Ti-Nb-B intermediate alloy, and carrying out hot extrusion and reprocessing; carrying out smelting and grain refining process of Al-Cu alloy melt; and preparing an as-cast alloy and carrying out T6 heat treatment. The grain size of the alpha-Al phase of the obtained alloy is smaller than 90 microns; and the maximum room temperature yield strength is 190.4 MPa, the tensile strength reaches 360.0 MPa, and the maximum ductility is 25.2%. The production cost is reduced, and the application range is expanded.

The invention relates to a method for preparing akund fiber blended yarn fiber, and belongs to the technical field of textile fabrics. The method includes: using chitosan as a raw material, allowing the chitosan to react with succinic anhydride, and performing surface grafting modification on the chitosan to acquired N-succinyl modified chitosan; dissolving the N-succinyl modified chitosan in polyvinyl alcohol to acquire a processing solution; soaking akund fibers in the processing solution; allowing films to be attached to surfaces of the akund fibers so as to improve the antibacterial performance and the mechanical property of the akund fibers; blending the akund fibers with films on the surfaces thereof, cotton fibers and polyester staple fibers into yarns to improve the mechanical property; and interweaving the yarns according to a weft plain stitch structure into the akund fiber blended yarn fabric. The prepared akund fiber blended yarn fabric is excellent in fabric tensile mechanical property, abrasive resistance, air permeability and thermal insulation property, is good in antibacterial effect, and can greatly expand the application range of the akund fiber blended yarn fabric in spinning.

The invention relates to a gluten fiber preparation method which comprises steps as follows: (1), preparation of a spinning solution; (2), spinning with a wet method; (3) solidification; (4) crosslinking treatment of citric acid; (5), secondary drafting; and (6), thermal treatment for sizing. The gluten fiber preparation method has the advantages of low production cost and simple and efficient production process of gluten fiber.

The invention provides a method for improving tensile strength of a silica ceramic based composite material. Gas phase grafting treatment is carried out for the silica ceramic based composite material by using methoxytrimethylsilane, drying pretreatment, preheating, vacuum-pumping, gas phase grafting, drying and heat treatment and other processes are used, in order to carry out enhancement for the silica ceramic based composite material, and the tensile strength of the material is increased by 15% or above. The technology is controllable, the technical bottleneck that tensile strength of the material in the prior moulding technology is improved, and the method is especially suitable for enhancing silica ceramic radome, antenna window, and other wave-transparent components.