393results about How to "With mechanical properties" patented technology

The invention discloses a preparation method of graphene-polyester nano-composite fiber. The preparation method comprises the step of preparing graphene-terylene polyester composite master batch and the step of preparing the graphene-polyester nano-composite fiber from the composite master batch. Compared with other conventional methods, the preparation method has the advantages that the technology is extremely simple, the reinforcing material is excellent in performance and low in cost; besides, excellent mechanical property and functional characteristics of graphene self endow the nano-composite fiber with functionalities like high strength and antistatic property, surface-modified and modified graphene has good dispersity and perfect interfacial compatibility in terylene polyester polymer matrix, which enables graphene to be effectively and uniformly compounded with a terylene polyester chip base material.

The invention relates to a process for preparing an internal frame of a blood vessel with electrostatic fiber tectorial. The concrete procedure is that 1, preparing polymer solution or polymer solution with drugs or bioactive elements, 2 preparing to obtain nanometer/ micrometer fiber, 3, forming a fiber film structure on the surface of the internal frame of the blood vessel. The shape of a fabric prepared by the invention imitates the shape of an epimatrix of a natural cell, thereby being beneficial for cells to sticki and breed, moreover, the drugs and active elements such as growth factor can be loaded in the nanometer fiber by an electro-spin to be released slowly, and the internal frame of the blood vessel with electrostatic fiber tectorial has good mechanical function, thereby satisfying the need of clinical releasing. In an implanting area, the invention can effectively support a lesion blood vessel to ensure the smoothness of the lesion blood vessel or can avoid dangers such as blood leakage due to angiomatosis in a diseased region. Simultaneously, the invention is capable of slowing releasing the drugs if necessary.

The invention relates to an underground target detection and recognition system and a method based on feature fusion. The method includes: detecting and acquiring echo signals of a ground penetrating radar; pre-processing the acquired echo signals; performing enhancement processing of the pre-processed echo signals; extracting time-domain feature and wavelet packet energy spectrum feature of the echo signals after enhancement processing, performing Welch power spectrum estimation and high-order spectral analysis of the echo signals after enhancement processing, and respectively obtaining a Welch power spectrum and a high-order spectrum; performing fusion of the time-domain feature, the wavelet packet energy spectrum feature, the Welch power spectrum, and the high-order spectrum of the echo signals; performing target recognition of the fused four kinds of signals via a wavelet neural network; and outputting a result after target recognition. According to the system and the method, comprehensive detection and recognition of the underground target can be realized based on multi-feature information fusion, the recognition of the underground target bodies in different shapes and of different materials can be effectively realized, and the recognition accuracy is high.

The present invention belongs to the field of polymer material synthesis, relates to aqueous polyurethane acrylate emulsion modification, and especially to an aqueous fluorine-containing acrylate modified polyurethane coating, a preparation method and an application thereof. The preparation method comprises: dissolving polyether polyol in an N-methyl pyrrolidone solution of dimethylol propionic acid; adding diisocyanate in a dropwise manner; adopting dibutyltin dilaurate as a catalyst, and adding hydroxyethyl methacrylate to carry out end capping; adding triethylamine to form a salt, then adding deionized water to prepare an aqueous polyurethane acrylate prepolymer emulsion; and finally adding hexafluorobutyl acrylate and azodiisobutyronitrile to prepare the aqueous fluorine-containing acrylate modified polyurethane coating. The synthesized emulsion of the present invention has the following advantages that: dispersion is uniform; stability is good; water resistance and mechanical property of the cured film are substantially improved; elasticity and mechanical property of polyurethane are provided; ultraviolet resistance, nuclear radiation resistance, flexibility, excellent surface properties, water resistance and corrosion resistance of the fluorine-containing material are provided; and the coating can be adopted as coatings for building and furniture.

The invention relates to scouring model experimental device of underground silt and method, which belong to the technical field of characteristic tests of hydraulics, river dynamics and soil and rockmechanics. The device comprises a scouring tank, a fixing table, a tilting device and a freezing tank. The method comprises the following steps: putting or stacking experimental soil samples or sand samples in the scouring tank; closing the scouring tank; starting a water flow for scouring the underground silt in a model experiment; shooting and recording a scouring process; closing the water flowand maintaining original water pressure when the scouring reaches a certain experimental state; then, freezing the scouring tank and the scouring samples by the freezing tank; labeling, positioning and cutting frozen scouring sample grids; and individually measuring, thawing, weighing and screening second-state frozen small samples to obtain the graduation of scouring models of the underground silt and the distribution of porosity in a scouring state. The scouring model experiment of the underground silt is carried out in a laboratory. The invention provides a reference and a theory for mutually stacking the silt, damming by sand stone and banking for preventing flood for river ways and is applied to the laboratory research of scouring the underground silt.

The invention discloses a preparation method for a colorless transparent high-temperature-resistant polyimide nanometer composite film, which belongs to the field of polymeric materials. The preparation method comprises the following steps: reacting 4,4-biscyclohexyl diformyl chloride (BCCL) with hexafluorobenzidine (TFDB) so as to prepare semi-aromatic fluorodiamine precursor; then subjecting the precursor, TFDB, 4,4'-(hexafluoroisopropenyl)diphthalic acid anhydride (6FDA) and hydrogenated 3,3,4,4-biphenyl dianhydride (HBPDA) to copolymerization so as to prepare polyamide acid precursor; grafting the polyamide acid precursor to a silane coupling agent in situ and carrying out aging and hydrolysis in a mixed solution of tetramethoxysilane (TMOS) and tetraethoxysilane (TEOS) so as to obtain a polyamide acid/silica mixed solution; and subjecting the mixed solution to tape casting and drying so as to obtain a polyimide/SiO2 composite film.

The invention discloses a 3D printed digital artificial bone. The artificial bone consists of a cortical bone, a cancellous bone and a marrow cavity, wherein the cortical bone is composed of poly-L-lactic acid or polyester-ester-ketone; the cancellous bone is formed by mixing poly-L-lactic acid and hydroxyapatite; the molecular weight of the poly-L-lactic acid of which the cortical bone is composed higher than that of which the cancellous bone composed; the cortical bone and the cancellous bone are simultaneously prepared by a 3D printing technology. The invention also discloses a 3D printing method for the digital artificial bone. According to the artificial bone disclosed by the invention, in micrometer and millimeter scales, the porosity of the cortical bone is 10 percent; the porosity of the cancellous bone is 60-80 percent, and the pore size of the cancellous bone is 120-220 micrometers. The 3D printed digital artificial bone has the porosity, the pore size and the mechanical property as those of a bone structure of human beings.

The invention relates to ultraviolet (UV) curing ink and a preparation method thereof. The UV curing ink comprises the components by mass percent: 32-42% of non-isocyanate polyurethane acrylate oligomer, 16-24% of epoxy acrylate oligomer, 18-32% of reactive diluent, 3-6% of photoinitiator, 2-4% of nano silicon dioxide, 1-2% of auxiliary agents and 6-12% of pigments. The invention also discloses the preparation method of the UV curing ink. The UV curing ink does not contain a polyisocyanic acid functional group, has environmental protection property, is rapid in photocuring, and has good gloss as well as excellent adhesive force, mechanical property and oil resistance.

The invention provides a fiber-reinforced plate-like plastic having a plate and a protrusion rising on the plate, wherein the plate and the protrusion each contain a laminated structure composed of plural reinforcing fiber sheets which each comprise many fibers of 10 to 100 mm in fiber length arranged in a fixed direction and at least two of the layers constituting the laminated structure are different in the direction of arrangement of reinforcing fibers and wherein at least part of the reingorcing fibers extend continuously from the plate to the protrusion and at least one of the layers constituting the laminated structure of the protrusion has a shape similar to the shape of the protrusion; and a process for the production of fiber-reinforced plastic which comprises cutting a unidirectional prepreg sheet composed of many reinforcing fibers arranged in a fixed direction and a matrix resin into prepreg base material sheets with the above fiber length, laminating the prepreg base material sheets with the directions of arrangement of reinforcing fibers of the base material sheets being different from each other to form a prepreg laminate, and heating and pressure-molding this laminate in a mold provided with a recess for forming the production.

The invention discloses a low-hydrogen welding rod for ultra-low-temperature high-manganese steel manual arc welding. The low-hydrogen welding rod for the ultra-low-temperature high-manganese steel manual arc welding comprises a welding rod core and a coating, wherein chemical components of the welding rod core comprise 0.30-0.75 wt% of C, 20-26 wt% of Mn, 6.5-8.5 wt% of Ni, 3.0-5.5 wt% of Cr, 2.5-4.0 wt% of W, less than or equal to 0.002 wt% of P, less than or equal to 0.001 wt% of S, and the balance Fe and inevitable impurities; and chemical components of the coating comprise 35-40 wt% of marble, 16-22 wt% of fluorite, 3-5 wt% of quartz sand, 3-6 wt% of zircon sand, 4-10 wt% of titanic schorl, 5-10 wt% of ferrotitanium, 5-8 wt% of low carbon ferromanganese, 3-6 wt% of silicon iron, 1-2 wt% of rare earth ferrosilicon, 2-3 wt% of synthetic mica, and 1-2 wt% of sodium carbonate, wherein the sum of the weight percentages of all the components is 100%. The low-hydrogen welding metal has excellent low-temperature toughness and the strength which is matched with the ultra-low-temperature high-manganese steel, and can meet the technical requirements for the strength and the ultra-low-temperature toughness of the ultra-low-temperature high-manganese steel to be welded.

The cutting steel with low content of C and high contents of S and P contains proportionally C, Si, Mn, P, S, N, Ca, Mg, Al, O, and Fe. It is prepared through smelting in electric furnace, conticasting and tandem rolling to become wire and rod. It has high cutting and mechanical performance.

The invention discloses a method for preparing composite material from inorganic calcium phosphate salt/biodegradable polymer fiber membrane. The method comprises the steps of superposing more than two inorganic calcium phosphate salt/biodegradable polymer fiber membranes to form a multilayer composite fiber membrane and hot press molding on the multilayer composite fiber membrane, wherein the orientation degree of fibers in the inorganic calcium phosphate salt/biodegradable polymer fiber membranes is more than 80 percent, and the included angle of the fiber orientation of adjacent layers of the multilayer composite fiber membrane is between 0 and 90 degrees. The method has the advantages of high adaptability, simple process, low cost and good repeatability. The prepared composite material has biological activity and remineralization performance, high mechanical properties and direction controllability.

The invention discloses amino porphyrin-poly (N-isopropylacrylamide) europium coordination compound and a preparation method of the amino porphyrin-poly (N-isopropylacrylamide) europium coordination compound. The preparation method of the amino porphyrin- poly (N-isopropylacrylamide) europium coordination compound is characterized in that (NH2)n-TPP is prepared into an ATRP initiator which is NH2-TPP-X, wherein the X is halogen. The NH2-TPP-X is adopted to initiate NIPAM to be polymerized to obtain polymer which is (NH2)n-TPP-PNIPAM. The europium with tervalence is coordinated with the polymer (NH2)n-TPP-PNIPAM to obtain coordination compound which is (NH2)n-TPP-PNIPAM-Eu(III)-TTA through the TTA, wherein the n meets an equation that is n=1,2,3. The amino porphyrin- poly (N-isopropylacrylamide) europium coordination compound is characterized in that a short form of the amino porphyrin- poly (N-isopropylacrylamide) europium coordination compound is (NH2)n-TPP-PNIPAM-Eu(III)-TTA, wherein the TPP is tetraphenylporphyrin, wherein the shortened form of the tetraphenylporphyrin is porphyrin, the PNIPAM is the poly (N-isopropylacrylamide), the Eu(III) is the europium with the tervalence, and the TTA is alpha- thenoyltrifluoroacetone.

The invention discloses a degradable polyurethane material with active oxygen responsiveness and a preparation method of the degradable polyurethane material. The degradable polyurethane material comprises a biodegradable polyester glycol soft segment and a hard segment composed of saturated aliphatic diisocyanate and reactive oxygen responsive small molecular diamine. The material is prepared bytaking poly(epsilon-caprolaclone glycol) (PCL) or polypropylene glycol fumarate (PPF) as macromolecular diols, saturated aliphatic diisocyanate as a raw material and reactive oxygen responsive small molecular diamine as a chain extender and adopting a two-step chain extension method. A polyurethane elastomer prepared from the degradable polyurethane material has good biocompatibility and responsiveness to reactive oxygen, the material and a degradation product are harmless to human bodies, so that the degradable polyurethane material can be widely applied to the fields such as biological medicines and tissue engineering and can be used for bone repair and myocardium generation.

The invention discloses an atmosphere-corrosion-resistant cold heading steel hot rolled wire rod with the grade being 10.9. The atmosphere-corrosion-resistant cold forging steel hot rolled wire is composed of, by weight, 0.25-0.35% of C, 0.15-0.35% of Si, 0.60-0.90% of Mn, less than or equal to 0.030% of P, less than or equal to 0.030% of S, 0.60-0.90% of Cr, 0.20-0.50% of Ni, 0.20-0.50% of Cu and the balance of Fe and trace impurities. According to the hot rolled wire rod, through the optimal design of chemical components, and by adding alloy elements such as Cu and Cr, a compact amorphous metal film which is closely combined with a substrate is naturally formed on a fastener through surface rust in the using process, so that the material has the atmosphere-corrosion-resistant effect; by adding an alloy element of Ni, the material has the good surface quality during hot rolling, the surface is free of obvious cracking phenomenon in the subsequent drawing and cold heading processes; and the hot rolled wire rod has the characteristics of being good in mechanical performance, corrosion resistance and formability and the like.

The invention discloses a copper casting mould rapidly moulded by a hot spraying technology and a manufacturing method of the copper casing mould. The copper casting mould sequentially comprises a heat-conducting layer, a transition layer and a heat corrosion-resistant layer from the inside to the outside, wherein the heat-conducting layer is formed by thermally spraying a high-heat conductivity metal material onto the surface of a substrate material; the transition layer is formed by thermally spraying a metal material with high deposition efficiency and corrosion resistance onto the heat-conducting layer; the heat corrosion-resistant layer is formed by thermally spraying an alloy ceramic material with high hardness and high heat corrosion resistance onto the transition layer. The copper casting mould is high in cost performance, and short in production cycle, and has excellent heat conductivity, heat corrosion resistance and hardness; by the manufacturing method, actual production requirements can be met; the manufacturing method is applicable to the field of manufacturing of a copper casting mould and other moulds; the copper casting mould has a good application prospect and economic benefits.

The invention relates to polyvinyl alcohol/sodium alginate medicine-loading hydrogel dressing having light-responsive bacteria resistance and a preparation method of the polyvinyl alcohol/sodium alginate medicine-loading hydrogel dressing, wherein a macromolecular medicine realizing fracturing under ultraviolet light is distributed inside the hydrogel dressing. The preparation method of the polyvinyl alcohol/sodium alginate medicine-loading hydrogel dressing comprises the following steps: grafting micromolecule antibiotic, namely, levofloxacin to polyethylene glycol macromolecular chains with amino groups at two ends through molecules with ultraviolet light response property, thus obtaining the macromolecular medicine realizing fracturing under ultraviolet light; and carrying out repeated freezing and thawing on a mixed solution of polyvinyl alcohol solution, sodium alginate solution and the macromolecular medicine realizing fracturing under ultraviolet light, thus obtaining the polyvinyl alcohol/sodium alginate medicine-loading hydrogel dressing having light-responsive bacteria resistance. The adopted raw materials have good biocompatibility, the obtained hydrogel dressing has certain mechanical property and has the ultraviolet-light-responsive antibacterial property, namely, the hydrogel dressing can realize controlled release of antibiotics under irradiation of 365nm ultraviolet light, and thus the polyvinyl alcohol/sodium alginate medicine-loading hydrogel dressing is suitable for protecting and treating the wound surface.

The invention provides a polystyrene microsphere/carbon nanotube co-modified hybrid polyether sulfone nanofiltration membrane. The nanofiltration membrane uses polyether sulfone as a substrate membrane, the substrate membrane is doped with nano silicon oxide, the surface of the nano silicon oxide is coated with chitosan, carbon nanotubes are deposited at the surface of the substrate membrane, wherein the thickness of the carbon nanotubes is 80-100 nm, the surfaces of the carbon nanotubes are coated with polydopamine, and polystyrene microspheres are deposited between the polydopamine and the carbon nanotubes. The hybrid polyether sulfone nanofiltration membrane prepared by the invention can be used for salt removing treatment in the preparation process of dye and effectively improve purityof the dye; and the nanofiltration membrane has good mechanical properties and strong anti-pollution ability.

The invention is a concrete regenerative aggregate obtained by crushing discarded concrete and its preparing method, using the discarded concrete as raw material, and making special processes of crushing, dry-blending, screening and washing to obtain it. It has physical and mechanical properties approaching those of natural stones, a relatively ideal material for preparing regenerative concretes with low strength, medium strength, etc, able to be widely applied to road engineering, municipal engineering and houses and buildings engineering.

The invention relates to a sodium alginate and chitosan skin tissue engineering scaffold material and a preparation method thereof. According to the scaffold material, sodium alginate and chitosan take CaCl2 as a crosslinking agent to form a scaffold base, and the mass ratio of the sodium alginate to the chitosan is 5:3-3:5; and a grid structure formed by the sodium alginate is crosslinked by the CaCl2 and put on a sodium alginate and chitosan scaffold base in an interlayer mode, the grid size of the sodium alginate is (1-2)*(1-2)mm<2>, and the height is 0.2 to 0.5mm. By the scaffold material, the sodium alginate and the chitosan base which can be completely degraded are taken as base materials; by combining an interlayer manufactured by a rapid prototyping (RP) technology, the mechanical strength of the sodium alginate and chitosan scaffold material can be improved; and the pore diameter of a scaffold is 100 to 150mu m, the porosity is more than 90 percent, and the tensile strength reaches 1 to 8 MPa. The scaffold material has high biocompatibility and is suitable for growth and proliferation of cells.

This invention relates to an electrophoretic display comprising cells which are filled with charged particles dispersed in a solvent and are individually sealed with a polymeric sealing layer.

The invention provides an environment-friendly acrylate grouting material, as well as a preparation method and an application thereof. The material mainly comprises the following components in parts by weight: a main agent, namely 100 parts of methacrylic acid-beta-hydroxyethyl ester, a crosslinking agent which includes 5-30 parts of hydrophilic compound containing a diallyl ether functional group, 1-5 parts of initiator and 0.5-3 parts of accelerant, 0-20 parts of an adjuvant, and a solvent, namely 2-1,000 parts of water. The method comprises the following steps: firstly, mixing the main agent, the crosslinking agent, the accelerant, the adjuvant and a part of solvent evenly to form a solution A in use; then dissolving the initiator into a residual solvent to form a solution B; and finally mixing the solution A with the solution B evenly, and solidifying at room temperature. According to the grouting material disclosed by the invention, the technical problem that the existing organic grouting material cannot be grouted once after being mixed with an inorganic grouting material, and the technical problem that the existing grouting material has poor durability, low strength, poor water solubility, low water expansion rate and high toxicity are solved.

The invention relates to a novel calcium titanate slag system flux-cored wire and a preparation method thereof. The novel calcium titanate slag system flux-cored wire is characterized in that welding flux of the flux-cored wire contains rutile and calcium titanate, wherein the mass ratio of the rutile to the calcium titanate is 10-15:22-28. The novel slag system flux-cored wire not only has the processing property of the flux-cored wire of a rutile slag system, but also has the mechanical property of an alkaline flux-cored wire. When the slag system flux-cored wire is adopted to weld, the operating performance is good, the spatter is small, the slag detachability is good, the low-temperature impact toughness is excellent, and compared with a traditional acidic flux-cored wire, the crack resistance is improved obviously. The content of diffusible hydrogen of the acidic flux-cored wire is greatly reduced, H5 standard can be reached, the comprehensive mechanical property of the acidic flux-cored wire is improved, the low-temperature impact value can be more than 50J even at the temperature of 50 DEG C below zero, and the crack resistance is excellent.