29results about How to "Excellent mechanical properties" patented technology

The present application relates to the technical field of bamboo fiber composite material, in particular to a purification preparation method of bamboo fiber reinforced natural polymer composite material. The bamboo raw material is crushed and treated by steam explosion to obtain primary bamboo fiber; the primary bamboo fiber is sequentially subjected to organic solvent dewaxing treatment and oxidation system selective delignification treatment to obtain purified bamboo fiber; the purified bamboo fiber is treated in a tannin acid solution to form a polyphenol interface layer on the surface thereof; and a solution containing polyvalent metal ions is added to the treated bamboo fiber to form a coordination cross-linking interface layer on the surface of the bamboo fiber. The present application constructs a stable interface layer between the fiber and the natural polymer matrix. The interface layer can effectively transfer stress, significantly improve the tensile strength, bending strength and shear strength of the composite material, and solve the problem of weak interface and easy delamination of traditional natural composite materials.

A polyimide resin powder is provided, which is a polyimide resin powder containing a tetracarboxylic acid component and a diamine component. The tetracarboxylic acid component includes 3,3',4,4'-biphenyltetracarboxylic acid dianhydride and 2,3,3',4'-biphenyltetracarboxylic acid dianhydride. The diamine component includes p-phenylenediamine, m-phenylenediamine and / or 4,4'-diaminodiphenyl ether. Based on the total molar amount of the diamine component, the content of p-phenylenediamine is 70 mol% to 98 mol%, and based on the total molar amount of the diamine component, the combined content of m-phenylenediamine and 4,4'-diaminodiphenyl ether is 2 mol% to 30 mol%.

The application discloses a high-flash-point alkyd protective paint and a preparation method thereof. The paint is a single-component product and specifically comprises high-flash-point alkyd resin, mixed alkane / aromatic hydrocarbon solvent oil, pigment, filler, bentonite, dispersant, drier, anti-skinning agent and the like. The paint has the advantages of high flash point (67-70 DEG C), fast drying, anti-yellowing, impact resistance, salt water resistance, excellent adhesion, high solid content, low VOC content and the like, and can be stored and transported as common goods.

The invention discloses a rodlike carbon nitride-polydimethylsiloxane composite coating and a preparation method and application thereof.The rodlike carbon nitride-polydimethylsiloxane composite coating is prepared by mixing rodlike carbon nitride filler, polydimethylsiloxane and a curing agent, and even doping of the rodlike carbon nitride filler can effectively improve the crosslinking density of the composite coating; the adhesive force and the tensile strength of the coating are enhanced; when the composite coating is applied to the surface of a matrix, a multifunctional nano coating with mechanical reinforcement, long-acting corrosion prevention and microbial antifouling characteristics can be formed, the impedance arc radius is kept at 5.17 * 10 < 9 > omega.cm < 2 > after the composite coating is soaked for 60 days, and the composite coating shows excellent bacteriostasis and sterilization performance on chlorella and escherichia coli; the excellent biological pollution prevention characteristic is shown.

The present application relates to the field of organic solar cells, and provides a kind of full asymmetric small molecule donor SMD-Asy and its preparation method and application.The SMD-Asy is connected by Stille coupling from asymmetrically substituted conjugated BDTT core and acceptor unit, and the side chain and main chain structure are all asymmetrically distributed.The preparation of the small molecule donor includes: constructing thiophene and benzo dithiophene diketone BDTT intermediate, introducing long-chain alkoxy side chain under phase transfer catalysis condition, obtaining tin precursor by low-temperature lithiation, and then coupling with halogenated acceptor unit to obtain target molecule.Due to the simultaneous asymmetric design of main chain-side chain, SMD-Asy can regulate the phase separation scale and chain conformation of blended film as the third component in PM6:Y6 system, thereby improving the hole / electron transport balance and mechanical ductility, so that the device can ensure high photovoltaic performance while improving the cracking strain rate.The small molecule donor of the present application is suitable for flexible and stretchable organic solar devices.

This is to provide a polyamide resin composition that has good mechanical characteristics such as tensile characteristics, bending characteristics and impact resistance, and low water absorption. The polyamide resin composition of the present invention comprises 55 to 78% by mass of an aliphatic polyamide resin (A), 20 to 35% by mass of glass fiber (B), 1 to 9% by mass of a crosslinking agent (C), 0.1 to 1.5% by mass of a heat-resistant agent (D) and 0 to 6% by mass of an inorganic filler other than glass fiber (E) in 100% by mass of the polyamide resin composition, and the aliphatic polyamide resin (A) has an average number of carbon atoms per one amide group of exceeding 6.

This invention relates to polyimide composite powders containing silane agents and methods for preparing the same. More specifically, the method for preparing the polyimide composite powder includes: step a), preparing polyamic acid by means of dianhydrides and diamines; and step b), imidizing the polyamic acid prepared in step a) by adding a silane agent. This invention uses a silane agent in a specific ratio and employs aqueous polymerization, thereby improving flowability and dispersibility without reducing mechanical properties.

Examples relate to thin films, transparent laminates, applications as cover films, and multilayer electronic devices incorporating the thin film, which possess excellent optical properties such as refractive index, haze, and yellowness, as well as excellent mechanical properties. The thin film includes an elastic layer with a refractive index of 1.48 to 1.58 and a low-temperature damage index (the difference between tensile modulus and tensile strength at a specific temperature), wherein the low-temperature damage index of the elastic layer at -40°C is below 1300 MPa.

The present invention relates to a composite electrolyte and a battery, and the composite electrolyte can include a base layer; and an active layer disposed on one side or both sides of the base layer and containing first inorganic particles and second inorganic particles, wherein the true density of the first inorganic particles can be equal to or less than the true density of the second inorganic particles.

The present invention addresses the problem of providing a polyamide resin capable of producing a film having good mechanical properties while suppressing production costs. The polyamide resin contains a structural unit represented by formula (1) and a structural unit represented by formula (2).

This invention provides a chemically strengthened glass-ceramic and its preparation. The chemically strengthened glass-ceramic includes a glass-ceramic substrate and a compressive stress layer formed on the surface of the substrate through ion exchange chemical strengthening. The glass-ceramic substrate comprises crystal family 1 and crystal family 2. Crystal family 1 includes crystals having the following structural formula: (Zn x Mg 1‑x‑y Al 2‑2y (Al) 2y Mg y O4, wherein: 0≤x≤1; 0≤y≤1; and 0≤x+y≤1; the crystal group 2 includes zirconium oxide; the compressive stress layer has a CTLD_saf value of 15000~70000 MPa. Compared with the existing LAS microcrystalline glass system, the chemically strengthened microcrystalline glass of the present invention not only has excellent mechanical properties and impact resistance, but also significantly reduces the overall cost.

Provided is a stereoscopic molding resin composition containing a multifunctional urethane (meth) acrylate having a molecular weight of 700 or more and 1,300 or less.

This application provides a stator core, stator, motor, powertrain, and vehicle, including: multiple stator laminations; the multiple stator laminations are stacked along the axial direction of the stator core, and each stator lamination includes N layers of first amorphous alloy sheets, where N≥1; wherein, the ratio of the axial dimension of the stator lamination along the stator core to the maximum radial dimension of the stator lamination along the stator core is the stator lamination diameter coefficient, which is 0.19‰~1.68‰. During the stamping process of obtaining stator laminations, by controlling the ratio of the axial dimension of the stator lamination along the stator core to the maximum radial dimension of the stator lamination, i.e., the stator lamination diameter coefficient, within a suitable range, the possibility of edge warping or even breakage of the stator laminations can be reduced, which is beneficial to improving the yield rate of the stator laminations.

Provided is a non-woven fabric having excellent liquid permeability and mechanical properties for a high-viscosity liquid. The non-woven fabric includes thermally adhesive composite fibers in which intersection points are thermally adhered, the specific volume of the non-woven fabric is 60 cm3 / g to 95 cm3 / g, and the fiber density ratio of a high-density region to a low-density region in the non-woven fabric is 1.4 or less. The thermally adhesive composite fibers constituting the non-woven fabric are distributed in a state of low density in the thickness direction of the non-woven fabric, and the fibers form adhesive points at an appropriate density.

The present application relates to the technical field of ore dressing equipment, in particular to a large-scale flip-flop screen with an octagonal tube supporting structure, a supporting beam comprising an octagonal tube and end plates arranged at both ends of the octagonal tube and fixed to the inner side wall of a screen box; a fixed hoop is clamped on the octagonal tube; a supporting strip comprises a strip-shaped plate fixed to the top of the fixed hoop, a sleeve ring fixed to the strip-shaped plate, a vertical rod slidingly sleeved in the sleeve ring, a spherical shell fixed to the top end of the vertical rod, a ball head rotatably sleeved in the spherical shell, and an internally threaded pipe fixed to the top end of the ball head; a lower strip arranged above the strip-shaped plate is provided with perforations three; a plurality of strip-shaped screen meshes are arranged in a horizontal staggered manner, and both sides of the strip-shaped screen mesh are provided with perforations one; a connecting piece is sequentially sleeved with the perforations one, three, and the internally threaded pipe; the top surface of an edge beam fixed to the inner side wall of the screen box and located below the strip-shaped screen mesh is provided with a threaded hole; and the problem that the flexible screen mesh in the large-scale flip-flop screen is inconvenient to assemble and maintain is better solved.

The utility model discloses a booster-level flame-retardant low-intermodulation feeder line, and relates to the technical field of cables. The booster-level flame-retardant low-intermodulation feeder line comprises an inner conductor, an insulating layer, an outer conductor and a sheath which are coaxially arranged from inside to outside, the outer conductor is a spiral corrugated metal tube, the insulating layer is made of low-density polytetrafluoroethylene with a fibrous microporous structure, and the sheath is made of booster-level flame-retardant fluorinated ethylene propylene; the booster-level flame-retardant low-intermodulation feeder line provided by the utility model has the characteristics of high temperature resistance, high flame retardance, high shielding, low loss, low passive intermodulation and super-flexible bending, is suitable for booster-level cables or cable assemblies of a UL system, and is particularly suitable for interlayers of ceilings and high-flame-retardant safe application occasions of super-flexible wiring connection.

The invention relates to hydrogel based on an ice skeleton and a preparation method thereof, in the method, the ice skeleton is used as a template guide, a 30wt% PVA solution is poured and filled into the ice skeleton at the temperature of-4 DEG C to-6 DEG C, the ice skeleton is frozen at the temperature of-18 DEG C to-22 DEG C, then the ice skeleton is dissolved and removed at the temperature of 20 DEG C to 30 DEG C, and the hydrogel with a preset three-dimensional directional microstructure is obtained. According to the preparation method, an ice skeleton is used as a process route of template guiding, PVA solution filling, freezing shaping and ice melting demolding, the obtained hydrogel has a regular three-dimensional directional microstructure, the mechanical strength and the structural stability of the hydrogel are superior to those of random porous hydrogel, the technical problem that in a traditional method, biotoxicity residues exist or demolding is difficult is solved, and the preparation method is suitable for large-scale industrial production. The high biocompatibility, the high integrity and the accurate regulation and control of the orientation and the size of the hydrogel are realized.

This invention relates to a food packaging material and a method for manufacturing the food packaging material. The food packaging material of this invention comprises a paper substrate having a first side and a second side, the second side being opposite to the first side, wherein the paper substrate is coated with a coating on at least the first side or the second side, the coating comprising wax and a copolymer selected from styrene-butadiene copolymers and / or styrene-acrylic copolymers.

The present disclosure relates to a flame retardant compound of a novel structure having excellent flame retardant properties and improved mechanical properties, and to a flame retardant resin composition and a flame retardant product using the same.

The utility model discloses a hollow ball screw quenching device belongs to ball screw processing technical field, including the feeding platform, the one side fixed mounting of feeding platform has the cooling platform, the one side fixed mounting of cooling platform has the sectional quenching box, the inside of feeding platform is provided with the sliding slot, the inside fixed mounting of sliding slot has the sliding board, in the utility model, through setting telescopic cover and fixed clamp, through the moving program of control box setting, will the feeding tray move to first heating chamber, after heating, through controlling the feeding tray to move to second heating chamber and heat finally, after heating, through controlling the feeding tray to move to the one side of sectional quenching box, control fixed clamp to the hollow ball screw after heating and take the inside of cooling groove and move, through a plurality of cooling spray pipe and carry out hollow ball screw cooling, and quenching process makes hollow ball screw in lightweight, high accuracy, long life etc. Contradictory demand obtains the best balance.

This specification provides a structure for in vitro blood perfusion that can effectively remove reactive oxygen species (ROS) that cause inflammation in the blood, an in vitro blood perfusion tube including the structure and an in vitro blood purification device, a method for preparing the structure, and an in vitro blood purification method using the in vitro blood purification device, wherein the structure for in vitro blood perfusion includes cerium dioxide nanoparticles and a carrier loaded with cerium dioxide nanoparticles.

A non-woven fabric characterized by having a thickness of 30.0 [mu] m or less and a toughness value of 0.50 or more, said toughness value being calculated as the integration of the specific tensile strength and the square root of the tensile elongation. The present invention relates to a nonwoven fabric having excellent mechanical properties despite being a thin film, and provides a thin film nonwoven fabric having excellent processability.

Provided is a liquid crystal polyester composition which has excellent flowability, and which is capable of forming a molded article having excellent mechanical properties (particularly tensile strength and tensile elongation), while exhibiting a low dielectric constant and a low dielectric loss tangent. A liquid crystal polyester composition containing a liquid crystal polyester and a polyaryletherketone, the liquid crystal polyester containing a first monomer unit having a condensed aromatic ring, the total content of the liquid crystal polyester and the polyaryletherketone being 80% by mass or more, and the content of the polyaryletherketone being 1-18 parts by mass per 100 parts by mass of the liquid crystal polyester.

The application provides a preparation method of a composite dielectric elastomer film and a dielectric elastomer film actuator. The preparation method comprises the following steps: step 1: mixing BTRU@CDs giant electro-rheological particles with an electro-rheological liquid dispersion phase to obtain a suspension; step 2: uniformly mixing silicone rubber with the suspension to obtain a composite dielectric elastomer prepolymer, wherein the mass ratio of the silicone rubber to the suspension is 15:1 to 1:1, and the mass ratio of the BTRU@CDs giant electro-rheological particles in the composite dielectric elastomer prepolymer is 5-40%; and step 3: film forming is performed on the composite dielectric elastomer prepolymer to obtain a composite dielectric elastomer film. The composite dielectric elastomer film prepared by the preparation method of the composite dielectric elastomer film has better actuating performance, better mechanical performance and better cycle stability than traditional rubber elastomers. The problems of high driving voltage, large pre-stretching ratio, limited actuating strain, poor fatigue resistance and easy breakdown of existing dielectric elastomer materials are solved.

The application discloses a Janus active composite film and a preparation method and application thereof, and relates to the technical field of food packaging. The method is used for preparing the Janus composite film by taking pectin as a hydrophilic layer, ethyl cellulose as a hydrophobic layer and chitosan as an intermediate adhesive layer. In the film, the pectin in the hydrophilic layer can adsorb fruit respiratory moisture and release the active substance citral, so that the antibacterial and antioxidant functions are realized; the chitosan in the intermediate layer has the function of an adhesive, so that the composite film is connected more closely; and the ethyl cellulose in the hydrophobic layer can effectively block the invasion of external water vapor, air and bacteria. The asymmetric structure has excellent water locking function and can significantly inhibit fruit weight loss. The preservation method is simple and safe, can delay fruit ripening and prolong the shelf life, and has a wide application prospect.

The high-strength ultra-fine grain austenitic stainless steel comprises, by mass, 15% < = Cr < = 18%, 11% < = Ni < = 12%, 2.0% < = Mo < = 2.8%, 1.0% < = Mn < = 1.8%, 0.4% < = Si < = 0.8%, 1.7% < = Ti < = 2.6%, 1% < = W < = 2%, 0.4% < = Nb < = 0.7%, 0.3% < = Ta < = 0.5%, 0.1% < = C < = 0.3% and the balance Fe and inevitable impurities, the structure of the high-strength ultra-fine grain austenitic stainless steel comprises austenite serving as a matrix and a nanometer precipitated phase of a core-shell structure, and the average grain size of the austenite is 1-5 microns. According to the high-strength ultra-fine grain austenitic stainless steel, austenite grains are refined through component design, and the strength is improved through a nanometer precipitated phase of a core-shell structure.

The invention provides a method for preparing low-protein natural rubber through enzyme compounding, and belongs to the technical field of preparation of low-protein natural rubber products. When the low-protein natural rubber is prepared, pancreatin and trypsin are matched according to the mass ratio of 1: 1, and when the dosage is 0.2 wt%, the protein content of a sample is the lowest. The low-protein natural rubber prepared by the process is superior to acid-coagulated natural rubber in tensile strength, aging property, Mooney viscosity and the like. Compared with the use of the traditional single protease, the use of the compound protease is obviously better than the use of the single protease, and the nitrogen content in the natural rubber can be reduced to about 0.086%; compared with a centrifugal method for preparing the low-protein natural rubber, the technology provided by the invention is simple in process, convenient to operate and more suitable for large-scale production while achieving an ideal effect.

The utility model provides a lithium battery aerogel heat insulation sheet packaging flame-retardant thermosetting film which comprises a glass fiber aerogel heat insulation sheet, and a PET (Polyethylene Terephthalate)-based thermosetting film is arranged on the outer layer of the glass fiber aerogel heat insulation sheet; a glass fiber aerogel heat insulation sheet with extremely low heat conductivity, good mechanical strength and light weight characteristics and a PET-based thermosetting film with good chemical resistance and mechanical properties are compounded to form the thermosetting film, and a graphene soft ceramic sheet is arranged between the glass fiber aerogel heat insulation sheet and the PET-based thermosetting film for heat conduction and flame retardance, so that the high temperature resistance, corrosion resistance and flame retardance of the thermosetting film are greatly improved; the heat-conducting graphene sheet layers at different layers are connected through the metal mixed graphite column, so that the heat of the inner layer can be timely conducted out, the change of the structure and the property of the glass fiber aerogel caused by heat stacking of the thermosetting film is avoided, the lithium battery packaged by the thermosetting film can keep a stable working temperature in a high-temperature environment, thermal runaway does not occur under a short-circuit condition, and the service life of the lithium battery is prolonged. In a combustion test, the PET-based thermosetting film material effectively prevents flame spreading and has good working efficiency.

The application provides a kind of plateau alpine microbial self-repairing concrete and its preparation method, relating to concrete crack self-repairing technology, comprising: ceramic sand preloading nutrient solution; urease type bacillus which is resistant to alkali is low temperature acclimated and low pressure acclimated; the preloading nutrient ceramic sand is placed in vacuum tank, after vacuumizing, the microbial liquid after acclimation is injected; after a certain time of adsorption under vacuum degree, the vacuum is released and the excess microbial liquid is drained to form the bacteria-loaded ceramic sand; in the high-altitude simulation cabin, polycarboxylate superplasticizer and mineralized substrate are dissolved in water and dry mixing material is added and mixed uniformly; the bacteria-loaded ceramic sand is added to the mixture and continues to be stirred to obtain a uniform mixture and is injected into a mold, and a low-frequency vibrating compaction is used to obtain a shaped material. The application solves the problem that the self-repairing concrete is difficult to repair due to microbial inactivation in the plateau alpine environment, can realize self-sealing of cracks, and does not exist harmful substances, effectively guarantees the crack repair effect.