41results about How to "Good tensile mechanical properties" patented technology

The invention relates to a method for preparing an antibacterial anti-acarid towel. The medical towel is prepared by blending wheat gluten protein fibers and cotton fibers, and the weight ratio of the wheat gluten protein fibers to the cotton fibers is (10-15):(85-90). The towel has traditional sterilizing and bacteriostatic functions and a cleaning function, and also has the functions of improving blood circulation, promoting metabolism, eliminating fatigue, inducing resuscitation and strengthening brain; the prepared towel is smooth in hand feeling, soft, comfortable, capable of absorbing moisture, breathable and more comfortable, and is a brand new antibacterial anti-acarid medical towel.

The invention relates to a preparation method of high-strength, high-modulus and high-elasticity polyurethane fiber, belonging to the technical field of fiber materials. The preparation method of a high-strength, high-modulus and high-elasticity polyurethane fiber of the present invention is that after the polyurethane spinning solution is extruded through the spinneret holes, the polyurethane spinning solution is passed through deionized water, ammonium salt, organic solvent containing amide bonds, acetone with a long solidification distance. In a coagulation bath mixed with a low relative molecular weight anionic surfactant, wet drawing molding and heat treatment are carried out to obtain high-strength, high-modulus and high-elastic polyurethane fibers. The preparation method of the present invention realizes simultaneous enhancement of the breaking strength, Young's modulus and elongation at break of the polyurethane fiber, and the breaking strength of the polyurethane fiber prepared by the present invention increases by 150-280%, and the elongation at break increases by 60-120% , Young's modulus increased by 50‑160%. The preparation method of the invention has simple process equipment, low cost, no pollution to the ecological environment, high controllability and great application prospects.

The invention relates to a preparation method of a high-strength, high-modulus and high-elasticity polyurethane film, and belongs to the technical field of film materials. In the method for preparing a high-strength, high-modulus, and high-elasticity polyurethane film of the present invention, a polytetrafluoroethylene plate coated with a polyurethane solution is put into a mixture of deionized water, ammonium salt, an organic solvent containing an amide bond, acetone and a low relative molecular weight. The anionic surfactant is mixed into the coagulation bath obtained by mixing the coagulation bath, and the coagulation bath is mechanically stirred, and then wet-formed and dried to obtain a high-strength, high-modulus, and high-elasticity polyurethane film. The preparation method of the invention realizes simultaneous enhancement of the breaking strength, Young's modulus and elongation at break of the polyurethane film, the breaking strength of the polyurethane film prepared by the invention increases by 270-560%, and the elongation at break increases by 80-280% , the Young's modulus increases by 50‑270%. The preparation method of the invention has simple process equipment, low cost, no pollution to the ecological environment, high controllability and great application prospect.

The invention provides a high-strength silk egg nanofiber film and a preparation method thereof. The aqueous solution of high-crystalline silk protein nanofibers is freeze-dried to obtain silk protein nanofiber freeze-dried powder; dissolved in formic acid solution to obtain silk protein nanofiber formic acid The solution is volatilized to form a film to obtain a silk protein nanofiber film. The high-crystalline fibroin nanofibers used in this method have a beta-sheet crystal structure and good stability, and can still maintain their original secondary structure and nanofiber morphology when dissolved in formic acid, and due to the optimization of non-covalent interactions The tensile mechanical properties of the prepared membrane material are greatly improved. The invention realizes the transition of mechanical properties from fragile to strong and tough through simple solvent conversion, and shows high tensile mechanical strength in dry state and wet state, reaching 69.2-76.9MPa and 13.5-14.6MPa respectively, and in It is carried out under normal temperature and pressure, and the preparation method is simple and feasible.

The invention relates to an ultra-high damping and high-strength metal matrix composite material and a preparation method thereof, and relates to the technical field of composite materials. The composition of the composite material is Cu‑11.9Al‑2.5Mn+1.0wt.% Cu 51 Zr 14 Adding 0.05wt.%-0.15wt.% multilayer graphene to the inoculant, the room temperature damping of the composite material is 0.0444-0.0979, the tensile strength is 750.36MPa-913.37MPa, and the elongation after fracture is 8.34%-13.48%, which can It satisfies the needs of applications in high-tech fields of vibration and noise reduction. This material preparation method uses vacuum hot rolling technology for the first time to add multilayer graphene with a lamellar structure to the CuAlMn shape memory alloy, which overcomes the The prior art has the disadvantages of limited damping improvement, complex process, long production cycle and the like.

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.

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 discloses a light sandwich-structure composite material and a preparation method of the light sandwich-structure composite material, belonging to the field of materials and relating to a weft knitting duel-axial fabric. The light sandwich-structure composite material takes a jute weft knitting duel-axial fabric as a surface layer and a straw core material as an intermediate layer and is prepared by performing hot pressing on the fabric and the core material and polypropylene chopped fibers. The weight of the light sandwich-structure composite material is lighter than a jute fabric reinforced polypropylene layer composite layer with the same thickness by 10-25%, the tensile strength is 23.5-50.2Mpa, and the flexural strength is 32.6-75.2Mpa. The surface layer fabric of the composite material can bring the characteristics of high strength and high modulus of yarns into full play, and simultaneously has unique excellent forming property. The sources of raw materials of a straw core layer are rich, and the straw core layer has the characteristics of low density, easiness in compression, good heat insulation, etc. The light sandwich-structure composite material can replace wood or synthetic fibers such as glass. The composite material can meet the general requirements of mechanical property; in addition, on the aspect of civil use, the light sandwich-structure composite material can be used as a non-load-carrying structure or a partial load carrying part and has vast potential for future development.

The invention discloses a quaternary hypoeutectic high-entropy alloy with good strong-plasticity matching, and the composition of the high-entropy alloy is Al x co y Cr z Ni w , wherein x, y, z and w respectively correspond to the molar ratio of the respective elements, 16≥x≥12, 30≥y≥26, 30≥z≥26, 32≥w≥28. This high-entropy alloy has a hypoeutectic structure and a good match between strong and plastic. Simultaneously the present invention provides the preparation method of this quaternary hypoeutectic high-entropy alloy, at first remove oxide skin from elemental metal, place in high-vacuum non-consumable electric arc melting furnace after weighing and mixing by molar ratio, in Under the protection of argon, arc melting is carried out under vacuum to obtain the alloy liquid, stir, and cool to obtain the alloy ingot; after repeated melting four times, the surface oxide skin of the obtained high-entropy alloy is removed, and the alloy ingot is cleaned twice with alcohol ultrasonic Placed in high vacuum arc melting flip casting and centrifugal casting system, remelted and cast into copper mold to obtain Al 14 co 28 Cr 28 Ni 30 High entropy alloy test sample. This method is simple, safe and stable.