104results about How to "Low modulus" patented technology

The invention belongs to the technical field of biomedical materials, and particularly relates to a hydrogel wound dressing and a preparation method and application thereof. The hydrogel wound dressing disclosed by the invention can be matched with a sound-sensitive agent by utilizing the temperature-sensitive shrinkage performance of the temperature-sensitive compound monomer, and shows ultrasonic thermal response shrinkage performance, specifically, the hydrogel wound dressing can be rapidly heated and remarkably shrunk under the ultrasonic action to promote wound shrinkage, so that wound healing is accelerated. The obvious potential is embodied in the aspects of promoting the repair of the wound infected by the drug-resistant bacteria and the repair of the wound infected by the drug-resistant bacteria and diabetes mellitus. When the prepared hydrogel wound dressing is used, the contraction degree of the hydrogel wound dressing can be controlled by adjusting the ultrasonic time in the treatment process, and protection and treatment effects on drug-resistant bacteria wounds are achieved in a programmed mode. Meanwhile, the fixing structure of the hydrogel can anchor added drugs such as a sound-sensitive agent and the like, and the action time of the drugs is prolonged.

The invention relates to plasticity-enhanced lead lanthanum zirconium tin titanate-based antiferroelectric ceramic and a preparation method thereof. The chemical formula of the zirconium tin lead titanate lanthanum-based anti-ferroelectric ceramic is (Pb < 0.975-x > La < 0.02 > Sr < x >) (Zr < 0.5 > Sn < 0.37 > Ti < 0.13 >) < 0.9975 > O < 3 >, x is smaller than or equal to 0.10; and sintering by adopting a flash sintering technology to prepare the plasticity-enhanced lead lanthanum zirconate tin titanate-based antiferroelectric ceramic. Wherein the initial electric field intensity is set to be 100-300 V / cm, and the temperature rise rate of the flash sintering furnace body is 5-15 DEG C / min; when the reading of the current detector reaches the order of magnitude of [mu] A, the electric field intensity is increased to 200-500V / cm; after the current density value reaches 10-30 mA / mm < 2 >, the stable current density is kept for 90-200 s; preferably, the temperature rise rate of the flash burning furnace body is 8-12 DEG C / min.

The invention discloses a phase change thermal interface material with interface adaptability and a preparation method thereof. The phase-change thermal interface material with interface adaptability is prepared from the following raw materials: a phase-change matrix premix, a grafting agent, a cross-linking agent, an initiator and a heat-conducting filler, the phase-change matrix premix comprises stearic acid and a polyolefin elastomer, the mass ratio of the stearic acid to the polyolefin elastomer is (6-8): (2-4), and the grafting agent is a crosslinking agent. The grafting agent is borane dioxide maleimide, and the cross-linking agent is diborane dioxide. The phase change material stearic acid is added into the thermal interface material, the problem of instantaneous high heat flux thermal shock caused by high heat flux to an electronic device can be effectively relieved through instantaneous heat absorption during solid-liquid phase change of the stearic acid, and the modulus of the phase change thermal interface material is reduced through solid-liquid phase conversion; therefore, the contact thermal resistance between a heat source and the radiator can be reduced to the greatest extent in the mechanical installation process.

The invention provides a wide-temperature-range heat-resistant bi-component polyurethane heat-conducting structural adhesive for a power battery PACK as well as a preparation method and application of the wide-temperature-range heat-resistant bi-component polyurethane heat-conducting structural adhesive. The bi-component polyurethane heat-conducting structural adhesive comprises a component A and a component B. The component A comprises the following components: bio-based polyol, polyol resin A, polyol resin B, a heat-conducting filler, a thixotropic agent, a moisture scavenger A and a catalyst; and the component B comprises the following components: an isocyanate-terminated polyurethane prepolymer, a heat-conducting filler, a thixotropic agent, a moisture scavenger B and a coupling agent. The polyurethane heat-conducting structural adhesive disclosed by the invention has the advantages that the damp-heat aging resistance and the high and low temperature resistance are greatly improved, the combination of flexibility, heat resistance and aging resistance is realized, and the polyurethane heat-conducting structural adhesive has wide temperature range applicability and is suitable for being applied to power battery PACK heat management and structural bonding.

The invention discloses an integrally-formed stiffened wall plate with light weight and high overall strength, and a forming mold, a forming method and application of the integrally-formed stiffened wall plate. The invention belongs to the technical field of stiffened wall plates and forming molds thereof. The technical problems that ribs and skin of an existing stiffened wall plate are prone to debonding and failure, so that the overall strength and reliability are poor, and an existing forming mold is not high in flexibility are solved. The lower edge strips integrated with the left vertical ribs and the right vertical ribs are arranged between the adjacent vertical ribs of the stiffened wall plate, and the lower edge strips and the skin are integrated through co-curing. The mold comprises an upper mold, a lower mold, a core mold and two L-shaped molds, the core mold and the two L-shaped molds are located between the upper mold and the lower mold, the core mold is in a right-angle U shape, the upper mold is clamped in a U-shaped opening, the vertical faces of the two L-shaped molds are horizontally and oppositely arranged inwards, and limiting blocks are arranged at the two ends of the vertical faces of the L-shaped molds and used for clamping the core mold. The forming method is convenient, co-curing forming is adopted, and the preparation process is simplified. The stiffened wall plate is applied to aircraft wings, fuselages and air inlets.

The present invention belongs to the technical field of polyethylene preparation, and specifically relates to a cross-linked polyethylene insulated cable and a preparation method thereof. The cross-linked polyethylene insulated cable is composed of material A and material B, and the weight ratio of material A to material B is 95:5; material A is composed of the following raw materials: modified linear low-density polyethylene, 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane, di-tert-butylperoxyisopropylbenzene, vinyl tri(2-methoxyethoxy)silane, 1,2-polybutadiene; material B is composed of the following raw materials: linear low-density polyethylene, dibutyltin dilaurate, and antioxidant. In the cross-linked polyethylene insulated cable of the present invention, material A interacts with material B, so that the finally prepared cross-linked polyethylene insulated cable has excellent mechanical properties, chemical stability, and heat aging resistance.

The invention provides a low-modulus and high-adhesion UV adhesive and a preparation method and application thereof.The low-modulus and high-adhesion UV adhesive is prepared from polycarbonate type polyurethane acrylate resin, N, N-dimethylacrylamide, hydroxyethyl acrylate, tripropylene glycol diacrylate, ethyoxyl ethyoxyl ethyl acrylate, vinyl chloride and vinyl acetate copolymer resin, bis (2, 4, 6-trimethyl-1, 3-pentanediol) (2, 4, 6-trimethyl-1, 3, 6-trimethyl-1, 3, 6-trimethyl-1, 3, 6-trimethyl-1, 3, 6-trimethyl-1, 3, 6-trimethyl-1, 3, 6-trimethyl-1, 3-pentanediol The coating is prepared from the following raw materials: 4-(2, 6-trimethylbenzoyl) phenyl phosphine oxide, 2-hydroxy-2-methyl-1-phenyl-1-[4-(2-hydroxyethoxy) phenyl] acetone, TPO (Thermoplastic Polyolefin), vinyl triethoxy silane, vinyl trimethoxy silane, a diluent and a de-foaming agent. The adhesive provided by the invention can be used for welding spot protection, prism fixation, glass and plastic bonding, structural member bonding and the like. Due to the low modulus, stress can be released during welding spot protection and structural part bonding, and the phenomena of cracking, layering and the like caused by stress residues are avoided, and functional failure of a product is avoided; and due to high adhesion, the product can be better protected, and the product has the characteristics of high vibration resistance, impact resistance, high and low temperature resistance and the like.

The invention discloses a preparation method of a semi-solid metal elastomer, which comprises the following steps: (1) adding liquid metal into water, and carrying out ultrasonic mixing to obtain an aqueous solution of suspended particles of liquid metal droplets; (2) adding solid metal particles into the aqueous solution in the step (1), and performing ultrasonic mixing to obtain a mixed suspension aqueous solution of the solid metal particles and the liquid metal droplets; (3) adding an acidic solution into the mixed suspension aqueous solution in the step (2) to obtain a solid precipitate, namely semi-solid metal SSM; and (4) grinding the semi-solid metal and the elastomer precursor solution, and curing to obtain the semi-solid metal elastomer SSME. The prepared semi-solid metal elastomer has better mechanical performance and conductivity, and the resistance change under strain is not obvious.

The present invention provides a flexural and tensile reinforced coarse aggregate ultra-high performance concrete and a preparation method thereof, comprising the following components: 300-800 parts of cement, 100-300 parts of fly ash, 100-300 parts of ceramic powder, 200-300 parts of silica ash, 500-800 parts of sand, 300-600 parts of crushed stone, 10-25 parts of polycarboxylic acid water reducer, and 150-200 parts of water; and also comprising MXene-carbon fiber composite material and steel fiber. The MXene-carbon fiber composite material is 0.2% to 2.0% of the total volume of concrete; and the steel fiber accounts for 0.5% to 2.0% of the total volume of concrete. The loading of MXene makes the carbon fiber more hydrophilic and rough, reduces the attachment of bubbles on the fiber surface and the generation of voids, and improves the compactness of the concrete; at the same time, MXene increases the bonding force, toughness and impact resistance of the carbon fiber / epoxy resin composite material; in addition, the conductive material MXene and the carbon fiber both increase the conductivity of the concrete. The present invention utilizes the mixed doping of carbon fiber composite materials and steel fibers to reduce the overall density of the fiber part and the dead weight of concrete, thereby obtaining a concrete product with enhanced toughening and chemical corrosion resistance.

The present invention relates to a polyurethane resin composition including an isocyanate group-terminated urethane prepolymer (E) and a neutralizer (F). The isocyanate group-terminated urethane prepolymer (E) contains a reaction product of a polyol (A) containing a polycarbonate polyol (B) having an average number of hydroxyl functional groups exceeding 2, an organic acid (C), and a polyisocyanate (D), in which a total content of urea groups in the polyurethane resin composition is 0.01 to 0.80 mmol / g with respect to a sum of a mass of the isocyanate group-terminated urethane prepolymer (E) and a mass of the chain extender (G), and the polycarbonate polyol (B) has a deemed average number of functional groups of 2.0 to 3.90.

The invention discloses a preparation method of natural polysaccharide-based degradable high-strength antibacterial hydrogel. The preparation method comprises the following steps: 1) preparing glacial acetic acid and high-viscosity chitosan into an aqueous solution A; (2) preparing an aqueous solution B from antibiotics and nano-hydroxyapatite, wherein the mass ratio of the antibiotics to the nano-hydroxyapatite is (1: 2.5)-(1: 7.5); 3) mixing the aqueous solution A and the aqueous solution B, and adding gelatin into the mixed solution to obtain an aqueous solution C; 4) adding an epoxy cross-linking agent with a volume fraction of 0.5-1% into the aqueous solution C, centrifuging to remove bubbles, and eliminating micro-defects in the product to obtain a solution D; and 5) adding a normal saline solution containing 1wt%-5wt% of sodium hydroxide into the solution D, and carrying out permeation crosslinking to obtain the antibacterial gel. The antibacterial hydrogel can be formed in a mold with a complex shape, and irregular defects can be repaired.

The utility model provides a panel supporting structure and a display device.The panel supporting structure is used for being arranged on the non-display side of a display panel so as to support the display panel; the panel supporting structure comprises a supporting back plate which is provided with a bendable area, and the bendable area comprises an opening area and a non-opening area; the covering film at least covers one side, deviating from the display panel, of the bendable area; wherein at least one of the supporting back plate and the covering film is internally provided with a shear thickening material layer, and at least part of the shear thickening material layer is arranged at the position corresponding to the opening area. According to the panel supporting structure and the display device, the mechanical strength of the display device can be improved.

The invention discloses a piezoelectric film with bionic textures and a preparation method and application thereof, the piezoelectric film is formed by directionally stacking and depositing fibers with core-shell structures, the piezoelectric film has a gully-bulge alternating bionic morphology imitating human skin surface textures, and the aperture of the piezoelectric film is gradually increased from an attachment surface in the thickness direction; the fiber having the core-shell structure comprises: a core layer having a porous structure and containing modified molybdenum disulfide and polyester; the shell layer wraps the core layer, and the shell layer contains collagen; the piezoelectric film comprises a sensing unit area and a flexible connection area, the collagen crosslinking degree of the sensing unit area is larger than 75%, and the collagen crosslinking degree of the flexible connection area is 40%-55%. Under the synergistic effect of materials and structures, the piezoelectric film not only has a high piezoelectric constant, but also shows excellent mechanical properties, air permeability and moisture penetrability, and has wide application prospects in the fields of electronic skin, health monitoring and the like.

The invention discloses low-modulus anti-fatigue composite hydrogel as well as a preparation method and application thereof. According to the composite hydrogel, low-modulus hydrogel is used as a soft matrix layer, and stretchable fabric is used as a reinforced knitted fabric layer; the preparation method comprises the following steps: putting the stretchable fabric into a hydrogel pre-polymerization solution, and forming a three-dimensional polymer network through a circulating freeze-thaw treatment method. And then putting the hydrogel into a drying oven, and carrying out drying and annealing treatment to form the annealed composite hydrogel. And finally, immersing the annealed composite hydrogel in deionized water until the composite hydrogel is completely swelled to form the required composite hydrogel. The invention also discloses application of the composite hydrogel as an artificial heart valve prosthesis. The composite hydrogel has the advantages of biological tissue-like stress-strain behavior, low modulus, high fatigue threshold value and the like.

This invention discloses a five-layer electrodeposited high-sealing corrugated pipe based on ultrasound assistance and its preparation method, belonging to the technical field of metal corrugated pipe manufacturing. It aims to solve the problem that in multi-layer electrodeposited corrugated pipes, it is difficult to effectively coordinate current density, surface quality, and interfacial bonding strength, leading to insufficient densification of the deposited layer, unstable interlayer bonding, poor wall thickness uniformity, and failure to meet airtightness standards, ultimately resulting in poor overall performance stability. This invention includes a five-layer composite structure in which the pipe wall is composed of alternating nickel-cobalt alloy and copper layers. Each layer of the five-layer composite structure undergoes ultrasonic vibration treatment during deposition. The corrugated pipe prepared by this invention has a uniform and dense deposited layer with good interlayer bonding. The five-layer alternating deposition layer composite structure not only achieves uniform stress transmission and dispersion, effectively delaying crack propagation and interfacial penetration, but also improves the uniformity of wall thickness distribution, enabling the corrugated pipe to exhibit higher structural stability and long-term reliability in a sealed environment.

The present application relates to a kind of high ductility silicon hydrogel, which is prepared by polymerization reaction of polymerizable composition containing thiol with functionality greater than or equal to 3, and the elongation of the high ductility silicon hydrogel is 285%-439%.The present application also relates to a kind of high ductility contact lens and its preparation method.By adding thiol with functionality greater than or equal to 3 as crosslinking agent in the formula of silicon hydrogel, the formed silicon hydrogel polymer network is more regular, more full and more stretchy, so that the prepared contact lens has good ductility, and the contact lens has high water content and low modulus.In addition, compared with the contact lens formed without adding thiol with functionality greater than or equal to 3, the size change of the contact lens formed after adding thiol with functionality greater than or equal to 3 is less than 5%.

The invention discloses a porous fusion cage and a design device and method. The porous fusion cage design device comprises a three-dimensional model acquisition module, a mechanical calculation module, a finite element module and a fusion cage parameter generation module. The three-dimensional model acquisition module is used for acquiring a three-dimensional model of a target area of a target object; the mechanical calculation module is used for calculating muscle and ligament load data of a target area of a target object; the finite element module is used for determining a finite element analysis result according to the three-dimensional model, the fusion cage model and the muscle and ligament load data; and the fusion cage parameter generation module is used for determining the design parameters of the porous fusion cage according to the finite element analysis result. According to the porous fusion cage design device, the overall biomechanical condition of the adjacent vertebral bodies can be comprehensively considered, and the designed porous fusion cage better meets the actual use requirement of a patient.

The utility model belongs to the technical field of self-adhesive labels, in particular to a flexible self-adhesive label suitable for curved surface adhesion, which comprises an outer layer, and a printing layer and a protective layer are sequentially coated on the upper surface of the outer layer from bottom to top. According to the flexible self-adhesive label suitable for curved surface pasting, the flexible self-adhesive label suitable for curved surface pasting is arranged and can adapt to curved surface pasting, the middle layer is made of silicon rubber, and controllable and local deformation (such as groove widening / deepening) can be generated when the label is subjected to bending or stretching stress through the stress release groove microstructure; therefore, stress is efficiently absorbed and dissipated, failure caused by the fact that the stress is transmitted to the edge of the label or the interface of the bonding layer is prevented, the stressed stress can be dispersed through the wave grooves, and the situation that the middle layer of the label is broken after being bent multiple times due to stress concentration is avoided.

The invention relates to an all-silicon-carbide low-temperature lens, a manufacturing method and application of the all-silicon-carbide low-temperature lens to a coaxial four-mirror optical infrared camera. The all-silicon carbide low-temperature lens comprises a primary lens, a secondary lens, a third lens and a fourth lens. The primary mirror and the fourth mirror are arranged in a back-to-back manner and structurally form an integrated structure of the primary mirror and the fourth mirror, namely, the primary mirror and the fourth mirror; the main fourth mirror and the third mirror are respectively connected to two ends of a lens bearing cylinder, and the secondary mirror is connected with one end, provided with the main fourth mirror, of the lens bearing cylinder through a secondary mirror supporting rod assembly; the main fourth mirror, the secondary mirror, the third mirror, the secondary mirror supporting rod assembly and the lens bearing cylinder are made of silicon carbide materials. The whole silicon carbide lens structure shrinks integrally in a low-temperature environment, athermalization design of a lens light machine is achieved, and low-temperature stability and adaptability of the lens are improved. The lens bearing cylinder improves the structural rigidity and stability of the lens, serves as a low-temperature cold shield, inhibits external stray light, and improves the signal-to-noise ratio of the lens.

This invention relates to the field of advanced semiconductor packaging materials technology, and particularly to a low-modulus, high-strength, and low-moisture-absorbing epoxy resin composition and its preparation method. By weight, the epoxy resin composition comprises: 20-60 parts of MAR-type epoxy resin base material one, 15-40 parts of modified masterbatch, 0.01-5 parts of a first catalyst, 30-700 parts of silicon powder, 0-30 parts of additives, and 25-60 parts of curing agent; the modified masterbatch is prepared from: MAR-type epoxy resin base material two, a second catalyst, and HTPB; the curing agent is MAR-type phenolic resin. This invention introduces HTPB into the MAR-type resin system to create a synergistic effect, resulting in a packaging material with low modulus, high strength, and low moisture absorption. The obtained composition can achieve a moisture sensitivity level of MSL1, meeting the high reliability packaging requirements of DFN / QFN and other packaging forms.

The invention belongs to the technical field of adhesives, and particularly relates to a low-modulus high-thermal-conductivity acrylate-based chip mounting adhesive and a preparation method thereof.The low-modulus high-thermal-conductivity acrylate-based chip mounting adhesive is prepared by taking acrylate as a base material and taking modified diamond and the like as additives through mixing, the flexible polymer chain segment structure contains a large amount of hydroxyl substituent groups generated by ring-opening reaction, so that the flexible polymer chain segment structure can participate in the subsequent curing process of the acrylate mounting adhesive, and the diamond and the acrylate mounting adhesive can generate a good interface effect, so that a dispersing agent is more uniformly added into acrylate, and the purposes of adding a small amount of the dispersing agent and adding a small amount of the dispersing agent are achieved. In addition, in the curing process, the flexible macromolecular chain segment is introduced into the acrylate structure, and the modulus of the mounting adhesive can be effectively reduced by utilizing the flexibility of the flexible macromolecular chain segment.

The invention relates to the technical field of high polymer materials, and discloses a low-floating-fiber rigid-tough balanced polyformaldehyde composite material and a preparation method thereof.The low-floating-fiber rigid-tough balanced polyformaldehyde composite material is prepared from polyformaldehyde, sodium sulfonate modified silicate ester, a polyurethane elastomer, mineral powder, a diphenylmethane diisocyanate compatilizer, an antioxidant 1010 and a zinc stearate lubricant; sequentially adding the raw materials into a high-speed mixer, stirring to obtain a mixed material, putting the premix into a feeding hopper of a double-screw extruder, feeding alkali-free glass fibers from the fifth section side, and carrying out melt extrusion to obtain the molten low-floating-fiber rigid-tough balanced polyformaldehyde composite material. And drawing, water-cooling, blow-drying, pelletizing and collecting to finally obtain the solid granular low-floating-fiber rigid-tough balanced polyformaldehyde composite material. The silicon element, the nitrogen element and the sodium sulfonate group in the sodium sulfonate modified silicate ester have good flame retardant effect, and the synergistic flame retardant effect is achieved.

The application discloses an antibacterial bio-based polyamide elastomer and a preparation method thereof. The preparation method comprises the following steps: preparing a polyamide prepolymer containing a tertiary amine structure through ring-opening polymerization reaction of caprolactam, N-diethyl-aminocaprolactam and sebacic acid, then reacting with polytetramethylene ether glycol to form a polyamide-polyether block copolymer elastomer, and further modifying the polyamide-polyether block copolymer elastomer through reaction with a halogenated hydrocarbon to realize quaternary ammonium modification, so that the quaternary ammonium salt antibacterial group is stably introduced into the polymer molecular structure in a covalent manner. The bio-based polyamide elastomer prepared by the application has excellent elastic properties and persistent and stable quaternary ammonium antibacterial properties, the antibacterial components are not easy to migrate and lose, the preparation process is simple and controllable, is suitable for the field of functional materials, and has a good application prospect.

There is provided a polyphenylene sulfide resin composition obtained by blending a (A) polyphenylene sulfide resin, an (B) amino group-containing resin, an (C) epoxy group-containing elastomer, and (X) at least one compound having a molecular weight of 1000 or less and selected from among carboxylic acids and carboxylic anhydrides, in which, when the total amount of the component (A), the component (B), and the component (C) is set to 100% by mass, the amount of the component (A) is 20% by mass or more and 60% by mass or less, and in the morphology of a molded article made of the polyphenylene sulfide resin composition as observed with a transmission electron microscope, the (A) polyphenylene sulfide resin forms a continuous phase, and the (B) amino group-containing resin and the (C) epoxy group-containing elastomer form a dispersed phase. The present invention makes it possible to obtain a polyphenylene sulfide resin composition that has high flexibility, high toughness, heat aging resistance, and chemical resistance, and is excellent in molding processability, and a molded article using the same.

The invention discloses an acrylic pressure-sensitive adhesive polymer, an acrylic adhesive, an adhesive tape and a preparation method and application thereof. The acrylic pressure-sensitive adhesive polymer is prepared from an acrylic monomer, a styrene monomer and an isoprene monomer through a polymerization reaction. The preparation method of the acrylic adhesive comprises the step of uniformly mixing the acrylic pressure-sensitive adhesive polymer with the tackifying resin, the antioxidant, the curing agent and the solvent to prepare the acrylic adhesive. The acrylic adhesive is applied to at least one side surface of a base material, and drying is performed to prepare the low-modulus high-cohesion adhesive tape. A thermal polymerization technology is adopted, and styrene and isoprene monomers are introduced into a reaction system for polymerization, so that the molecular strength of the polymer can be remarkably improved, the problem of overhigh modulus of the polymer can be effectively controlled, the polymer has the characteristics of high strength and low modulus, and the adhesive tape with low modulus and high cohesion characteristics is prepared; and the thin and narrow application requirements in large-size electronic products are met.

The invention relates to a metallic glass flake, a preparation method thereof and application of the metallic glass flake in heavy-duty anticorrosive paint, and belongs to the technical field of amorphous alloy. The metal glass flake is a flaky amorphous alloy with an irregular shape on the edge, and comprises the following components: Fe, Cr, P, MA and MB, mA is at least one of B, C and Si; mB is at least one of Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Td, Dy, Ho, Er, Tm, Yb and Lu; the molar percentages of Fe, Cr, P, MA and MB in the metallic glass flakes are respectively 40%-80%, 1%-40%, 1%-20%, 1%-10% and 0%-5%; the radius-thickness ratio of the metal glass flakes is larger than or equal to 3. The metal glass flakes can endow the heavy anti-corrosion coating with good wear resistance and adhesive force and excellent corrosion resistance.

The invention relates to an attached photoelectric health monitoring device and method based on a photoelectric detector, and the device comprises an ultrathin flexible substrate which is made of Parylene-C; the S-shaped interconnection electrode is formed on the ultrathin flexible substrate; the perovskite photoelectric detection layer with the two-dimensional Ruddlesden-Popper structure is regionally deposited on the snakelike interconnected electrode, and the general formula of the perovskite photoelectric detection layer is (PEA) 2 (MA) < n > < 1 > Pb < n > I < 3 > < n > < 1 >; the LED light source is arranged on the ultrathin flexible substrate, and the LED light source and the two-dimensional Ruddlesden-Popper structure perovskite photoelectric detection layer are located on the same plane to form a reflective detection mode; and the packaging layer covers the two-dimensional Ruddlesden-Popper structure perovskite photoelectric detection layer and the LED light source, the material of the packaging layer is Parylene-C, and the packaging layer and the ultrathin flexible substrate jointly form a symmetrical double-layer packaging structure. Compared with the prior art, the invention has the advantages of high fitness and comfort, high sensitivity, quick response, high environmental stability and mechanical durability, low power consumption, high signal-to-noise ratio, high signal quality and detection precision and the like.

The invention belongs to the technical field of metal biological materials, and discloses a low-modulus high-strength near-beta-titanium alloy and a preparation method thereof, the chemical general formula of the alloy is Ti80-x-yNb20ZrxSnyTaz, 2 < = x < 6, 1 < = y < 3, 2 < = z < 5. The preparation method comprises the following steps: melting the low-modulus and high-strength near-beta-titanium alloy raw materials in a protective atmosphere by using a non-self-consumption vacuum arc melting method, uniformly mixing the molten metal liquid under magnetic stirring, and turning over and melting for a plurality of times to obtain a polycrystalline cast ingot; the polycrystal cast ingot is subjected to solution treatment, and water-cooling quenching is conducted after heat preservation is finished; and carrying out cold rolling on the water-cooled and quenched polycrystalline cast ingot to obtain a cold-rolled plate with a preset thickness. According to the invention, the elastic modulus of the alloy is reduced through element doping and cold rolling annealing processes, specifically, the alloy can be found to have extremely low modulus of 28.9 GPa when being stretched at room temperature, so that the problems of relatively high modulus and low strength of the titanium alloy in the prior art can be effectively solved.

The invention relates to a polyurethane sealant for a power battery. The polyurethane sealant is prepared from the following components in parts by weight: 30 to 50 parts of self-made silicon modified diol, 10 to 20 parts of polyether diol, 10 to 20 parts of polyester diol, 12 to 25 parts of polyisocyanate and 4 to 8 parts of gaseous silicon. The polyurethane sealant prepared by the method provided by the invention has good high and low temperature resistance, has low storage modulus in a range of-30 DEG C to 60 DEG C, greatly reduces the occurrence of glue failure and other phenomena caused by temperature change, can form effective adhesion to different materials, and meets the requirement of no obvious strength attenuation for 1000 hours in a double-85 test; and the vehicle use requirements under most working conditions can be met.

The invention discloses a material for hydrophilic modification of a polytetrafluoroethylene microporous membrane and a preparation method of the material, the material comprises a PVA solution, aminobenzaldehyde, glacial acetic acid, alkyl sulfonyl chloride and an epoxy group material, the glacial acetic acid enables aldehyde groups in the aminobenzaldehyde and hydroxyl groups of PVA to be subjected to an aldolization reaction and introduces amino groups; alkyl sulfonyl chloride is used for introducing a hydrophobic chain segment on PVA (Polyvinyl Alcohol). In order to introduce a benzene ring, condensation reaction is carried out between an aldehyde group of aminobenzaldehyde and a hydroxyl group of PVA, the benzene ring and an amino group are introduced to a PVA skeleton, the benzene ring is a rigid group, the introduction of the benzene ring improves the modulus of the PTFE microporous membrane material, and the introduction of a hydrophobic chain segment of a long carbon chain can further reduce the polarity of PVA, so that PVA is more easily combined with the surface of PTFE.