8results about How to "High specific modulus" patented technology

The invention belongs to the technical field of coatings, and particularly relates to a coating for a galvanized plate and a preparation method thereof. According to the invention, molybdenum disulfide is modified by using graphene oxide and carbon nanotubes. Compared with an inert structure of a molybdenum disulfide nanosheet, a graphene oxide sheet layer contains a large number of oxygen-containing functional groups, and dispersion of the molybdenum disulfide nanosheet in the waterborne polyurethane coating can be effectively improved by modifying the molybdenum disulfide nanosheet through graphene oxide. The one-dimensional-structure carbon nanotubes added in the grafting reaction process of the graphene oxide and the modified molybdenum disulfide nanosheets can effectively prevent agglomeration of the nanosheet layers in the reaction process, so that uniform modification of the molybdenum disulfide nanosheets is ensured; and moreover, the carbon nanotubes have relatively high specific strength and specific modulus, and the added carbon nanotubes can form an interactive network with the graphene oxide and the molybdenum disulfide nanosheets, so that the mechanical property and the corrosion resistance of the waterborne polyurethane coating are greatly improved.

The invention discloses a parachute-free air-drop bag, and belongs to the technical field of emergency rescue and air transportation materials, the basic material of the air-drop bag is an ultra-high molecular weight polyethylene composite material, the air-drop bag comprises a vertically placed bag body, a plurality of blast pockets are sewn on the upper portion of the outer wall of the bag body, and longitudinal braids and transverse shrouds which are arranged in a crossed mode are sewn on the outer portion of the bag body. A buffer air cushion is sewn below the bag body; the buffering air cushion is formed by combining a soft buffering cushion, a hard buffering cushion and a buffering cushion sleeve, a plurality of air inlet holes are evenly distributed in the bottom of the buffering cushion sleeve, a plurality of air outlet holes distributed circumferentially are transversely formed in the side face of the buffering cushion sleeve, and the air inlet holes and the air outlet holes are all communicated with the soft buffering cushion. The parachute-free air-drop bag provided by the invention is wear-resistant and anti-collision, not only can the accuracy of air-drop be ensured, but also air-drop materials can be effectively protected, and secondary ejection during landing collision is avoided.

The invention discloses a thermoplastic high-strength fiber covering yarn prefabricated composite material and a preparation method thereof. The preparation method provided by the invention comprises the following steps: 1) impregnating core yarns in a resin sizing agent and resin slurry, and carrying out pre-impregnation treatment to obtain high-strength fiber core yarns; wherein the material of the resin slurry is selected from at least one of polyether-ether-ketone, nylon and polypropylene; 2) covering the surface of the high-strength fiber core yarn with the yarn by using a multi-spindle knitting machine to obtain a knitted core-spun yarn; (3) weaving the weaving covering yarn through a multi-spindle weaving machine to obtain a covering yarn preset sleeve; and 4) curing the core-spun yarn preset sleeve to obtain the thermoplastic carbon fiber woven reinforced composite material. The composite material provided by the invention has the characteristics of high resin content, high structural stability and excellent interface performance, also has high flexibility, can be packaged by folding, winding, winding and the like, realizes extremely low space occupancy, is convenient to store and transport, and greatly reduces the storage and transportation cost.

The invention belongs to the technical field of composite materials, and particularly relates to a titanium-based composite material of a bionic layered structure and a preparation method and application of the titanium-based composite material. The titanium-based composite material is prepared from the following chemical components in percentage by mass: 88.0%-92.0% of a Ti element, 6.2%-7.5% of a Cr element, 0.6%-0.9% of a B element, 0.6%-1.0% of a C element and inevitable impurities, and the total percentage is 100%. A material containing a Ti element, a material containing a Cr element, a material containing a C element and a material containing a B element are subjected to vacuum suspension smelting and casting of a (TiC + TiB) / Ti composite material cast ingot, the obtained (TiC + TiB) / Ti composite material cast ingot is subjected to homogenization, hot rolling and annealing composite process treatment, then the annealed (TiC + TiB) / Ti composite material cast ingot plate is used as a reinforcing layer, a TC4 titanium alloy plate is used as a toughness layer, and the TiC + TiB / Ti composite material cast ingot is subjected to heat treatment. Alternately laminating and placing; and finally, the high-toughness titanium-based composite material of the bionic layered structure is obtained through vacuum hot-pressing diffusion bonding. The high-strength and high-toughness titanium-based composite material has high strength and high plasticity at the same time.

The present invention provides a vibration damper based on a multiphase lattice microstructure coupling system, which relates to the field of vibration damping control and additive manufacturing technology, including: a multi-layer vibration damping layer; a multiphase lattice layer, the multiphase lattice layer is arranged between adjacent vibration damping layers, the vibration damping layer and the multiphase lattice layer are both made of Ti‑6Al‑4V alloy, and the multiphase lattice layer is filled with rubber particles. The vibration damper is made of Ti‑6Al‑4V alloy by selective laser melting technology and is printed layer by layer. Compared with traditional rubber vibration dampers, it has better mechanical properties and stability, can maintain good energy absorption performance in extremely cold and extremely hot environments, and can overcome the influence of temperature on vibration damping performance.

This invention discloses a bamboo fiber, its preparation method, and a bamboo fiber wound hydrogen storage tank. The preparation method of the bamboo fiber includes the following steps: cutting natural bamboo into equal-length bamboo poles and pretreating them by soaking them in boiling water to remove water-soluble organic matter; mixing hydrogen peroxide, organic acid, and H2SO4 in a certain proportion to prepare a peroxyacid solution, wherein the concentration of hydrogen peroxide in the peroxyacid solution is 7-24 wt%, the concentration of organic acid is 15-55 wt%, and the concentration of H2SO4 is 0.5-3 wt%; soaking the pretreated bamboo poles in the peroxyacid solution at 50-60℃ for 12-20 hours to obtain bamboo fiber; then soaking the bamboo fiber in an alkaline solution for neutralization, and washing it after neutralization; vacuum drying the washed bamboo fiber and twisting it to extend its length to obtain long fiber; and applying microwave irradiation to the long fiber to obtain the final product.

The present application belongs to the technical field of paint, and particularly relates to a kind of paint for galvanized sheet and its preparation method.The present application uses graphene oxide, carbon nanotube to modify molybdenum disulfide.Compared with the inert structure of molybdenum disulfide nanosheet, graphene oxide sheet layer contains a large number of oxygen-containing functional groups, and the modification of molybdenum disulfide nanosheet by graphene oxide can effectively improve the dispersion of molybdenum disulfide nanosheet in water-based polyurethane paint.In the process of grafting reaction between graphene oxide and modified molybdenum disulfide nanosheet, the addition of one-dimensional structure carbon nanotube can effectively prevent the aggregation of nanosheet layer during the reaction process, thereby ensuring the uniform modification of molybdenum disulfide nanosheet;and, carbon nanotube has high specific strength and specific modulus, its addition can form an interactive network with graphene oxide and molybdenum disulfide nanosheet, greatly improving the mechanical properties and corrosion resistance of water-based polyurethane coating.

The invention discloses a preparation process of a carbon nano tube modified aluminum alloy high-strength fitting, which comprises the following steps: S1, a raw material treatment stage: after coarsely filtering and purifying carbon nano tubes and aluminum alloy powder, putting the carbon nano tubes and the aluminum alloy powder into a wet mixing and ball milling device for mixing and dispersing to form composite powder; s2, a drying and filtering stage; s3, a melting and refining stage; s4, a curing and hot pressing stage; and S5, a bending assembly stage. According to the preparation process of the carbon nanotube modified aluminum alloy high-strength fitting, the performance of the aluminum alloy can be effectively improved by adding the carbon nanotube powder, so that the prepared fitting has the advantages of high specific strength, high specific modulus, wear resistance and corrosion resistance; in the preparation process, the damage of mechanical ball milling to the carbon nano tube powder is avoided through a wet ball milling mode, in addition, in the preparation process, the carbon nano tubes are dispersed in a liquid phase dispersion mode, the dispersed carbon nano tube powder is prevented from being agglomerated again in the sintering process, and the quality of the hardware fitting is guaranteed.