20results about How to "Maintain mechanical properties" patented technology

The invention belongs to the technical field of aeronautical materials, and particularly relates to a PEI modified material containing a high-temperature composite dispersion system as well as a preparation method and application of the PEI modified material. The PEI modified material containing the high-temperature composite dispersion system provided by the invention is prepared from the following raw materials: polyetherimide resin, titanium dioxide, carbon black and dispersing agents (a coupling agent and polyamide wax). The PEI modified material containing the high-temperature composite dispersion system provided by the invention can realize efficient and uniform dispersion and color regulation and control of pigments in a high-viscosity and strong-polarity system, and has excellent heat resistance, mechanical property and flame retardant property, and interior structural parts prepared from the PEI modified material meet the comprehensive requirements on light weight, attractiveness and durability in the aviation field.

The application provides a copper-aluminum dissimilar metal resistance brazing method for a wind power generator, comprising the following steps: S1, temperature field regulation of partition resistance heating: a partition resistance heating mode of double-electrode independent power supply is adopted, current is respectively input to the copper side and the aluminum side for independent control, and the brazing interface temperature is controlled in the range of 580-620 DEG C; S2, interface diffusion control of nano nickel barrier layer: a nano-crystalline nickel barrier layer is prepared in advance on the surface of the copper matrix to be connected; S3, wetting and filling of zinc-based composite filler material: zinc-based composite filler material is used for brazing; S4, pressure-assisted brazing seam densification: axial pressure in the range of 0.5-2 MPa is applied during brazing; S5, atmosphere protection and surface activation: the brazing process is carried out under the condition of inert protective atmosphere. Through the cooperation of partition heating and nano nickel barrier layer, the strength of the copper-aluminum brazed joint is improved to more than 80% of the base material, and the contact resistance is reduced to 3 mu omega cm 2 The energy consumption of the single piece is reduced by 80%, and the qualified rate reaches more than 95%.

This invention discloses a tensile-strength steel-cored aluminum stranded wire, relating to the technical field of steel-cored aluminum stranded wire. The tensile-strength steel-cored aluminum stranded wire of this invention comprises at least: a steel core; a Zn-Ni-WC composite coating, electroplated on the steel core; aluminum strands, stranded on the steel core coated with the Zn-Ni-WC composite coating; and an anti-corrosion coating applied to the stranded aluminum strands. The anti-corrosion coating comprises the following raw materials in parts by weight: 60-70 parts of long-chain modified polyurethane acrylate prepolymer; 25-30 parts of acrylate isoborneol ester; 15-20 parts of dopamine-modified sustained-release microcapsules; 2-5 parts of photoinitiator; 0.5-1.5 parts of leveling agent; and 0.5-1.5 parts of dispersant. This invention, by setting a Zn-Ni-WC composite coating on the steel core and an anti-corrosion coating on the steel-cored aluminum strands, enables the prepared tensile-strength steel-cored aluminum stranded wire to possess superior corrosion resistance and ultra-long-term tensile strength retention.

This invention discloses an infrared camouflage composite yarn, its preparation method, and its application. The preparation process involves first preparing a preform, then dispersing aluminum powder and tin-doped indium oxide powder on a softened film to form an infrared-resistant film. The infrared-resistant film is then coated onto the preform using a layered structure design to prepare a composite preform. Combined with heat treatment, the yarn is then hot-stretched to obtain the improved infrared camouflage composite yarn. The infrared camouflage composite yarn prepared by this invention not only possesses excellent infrared camouflage capability and durability, but the addition of functional particles does not significantly affect the yarn's mechanical properties, such as breaking strength. The functional particles maintain uniform dispersion, improving the uniformity of infrared camouflage performance. This method is suitable for preparing infrared camouflage products, such as military jackets, tents, and backpacks.

The present application relates to the technical field of geotechnical engineering investigation, and specifically discloses a rock-soil investigation adjustable-depth sampling method, which acquires pore fluid pressure data in real time through a sensor group arranged at the front end of a sampler; based on the data, the evolution trend of the pressure field in front of the sampler is dynamically predicted, and a prediction result containing the pressure abnormal state and its space-time information is generated; the prediction result is processed in stages to obtain a pressure risk level; the level is used in a collaborative decision with the soil sensitivity and the target sampling quality to generate a dynamic control strategy; finally, the penetration action of the sampler is adjusted in real time according to the strategy, including performing a micro-retraction and re-penetration cycle or a gradual deceleration operation, and the control effect is ensured through closed-loop optimization; the present application can actively suppress water hammer and cavitation effect, and improve the quality and reliability of obtaining undisturbed samples in complex strata.

The invention discloses a gradient effect-based liquid drop directional self-transport pattern scanning electrolysis device and method, the device comprises a micro electrode module and an electrolytic bath, and the micro electrode module is connected to a three-axis linkage platform; a workpiece clamp is arranged in the electrolytic bath; electrolyte is contained in the electrolytic bath; the workpiece clamp installs a workpiece; the workpiece clamp is connected with an anode of an electrolysis power supply, a microelectrode of the microelectrode module is connected with a cathode of the electrolysis power supply, the electrolysis power supply is switched on, and an electrolysis loop is formed among the microelectrode, the electrolyte and the workpiece clamp. A micro electrode is controlled by a three-axis linkage platform to perform scanning electrolysis according to a preset scanning path, scanning speed, electrolysis voltage and electrode spacing, and a wetting pattern with a gradient effect is constructed on the surface of a workpiece, so that a non-equilibrium surface tension difference is generated on a front contact line and a rear contact line of a liquid drop and is converted into a Laplace pressure difference; the method has the advantages of being flexible in design, high in preparation precision and free of surface heat damage.

The invention discloses a zirconia ceramic matrix with high thermal shock resistance as well as a preparation method and application thereof. The zirconia ceramic matrix comprises a matrix and a coating layer a; the matrix comprises the following components: 90-98 wt% of zirconium oxide; 1.5 to 8 wt.% of a stabilizing agent; % of a grain boundary regulating agent; the stabilizing agent is prepared from the following components in percentage by weight: 2.0 to 4.0 percent of Sc2O3, 0.5 to 1.5 percent of Yb2O3 and 0.3 to 1.0 percent of Er2O3; the grain boundary regulating agent is a composition of a boron source and an aluminum source; in the coating layer a, the molar ratio of zirconium to aluminum is (2-3): 1; and the component 1 is polyvinyl alcohol or polyvinylpyrrolidone. The fracture toughness, bending strength and thermal shock resistance of the ceramic matrix are effectively improved, and the overall mechanical property is remarkably improved. When the material bears thermal shock, the thermal shock resistance of the material is improved, and the application scene of the zirconia ceramic material is expanded.

This invention discloses a low-smoke halogen-free flame-retardant network cable and its preparation method, comprising a conductor, an insulation layer, a foamed filler strip, an aluminum-plastic composite film wrapping layer, a non-woven fabric wrapping layer, and a halogen-free flame-retardant outer sheath layer. The halogen-free flame-retardant sheath layer is prepared from the following components: ethylene-vinyl acetate copolymer, POE, pretreated magnesium hydroxide, ammonium polyphosphate, modified lignin, attapulgite, zinc borate, maleic anhydride-grafted ethylene-vinyl acetate copolymer, antioxidant, and calcium stearate. This low-smoke halogen-free flame-retardant network cable uses an EVA / POE blend as the sheath matrix and employs a ternary composite flame-retardant system of magnesium hydroxide, ammonium polyphosphate, and modified lignin, synergistically using zinc borate and attapulgite as functional additives. Without introducing halogens, the sheath material simultaneously possesses B1-level flame-retardant performance, low-smoke and low-toxicity characteristics, and transmission performance meeting the Category 6 network cable standard. The overall solution balances the requirements of flame-retardant safety and communication functionality.

The invention belongs to the technical field of textile, and relates to a method for reducing PET melt spinning temperature and improving fiber mechanical property at the same time, the PET melt spinning process comprises the steps of melt extrusion by a twin-screw extruder, side blowing cooling, oiling, winding and drafting by a drafting machine, silicone with a specific content, a specific structure and a specific molecular weight is introduced into a PET melt in a master batch form, and the intrinsic viscosity of PET and a carrier PET in the master batch, the screw rotating speed of a double-screw extruder and the spinning temperature are regulated and controlled, so that the melt spinning temperature of the PET is reduced, and meanwhile, the mechanical property of the fiber is effectively improved.

The application relates to a preparation method of high-pre-stretch polyethylene wrapping film with elastic memory, and belongs to the technical field of polymer material processing. The application aims to overcome the problems of the existing wrapping film, such as the decline of mechanical properties, the serious stress relaxation and the easy migration and pollution of liquid tackifier under the conditions of film thinning and high-pre-stretching. The technical scheme of the application is characterized in that a functional asymmetric five-layer co-extrusion structure is adopted, the structure is sequentially arranged from inside to outside as an adhesion layer, a first transition reinforcing layer, a core elastic layer, a second transition reinforcing layer and a smooth peeling layer, the core elastic layer is composed of a molecular network of octene metallocene linear low-density polyethylene and propylene-based polyolefin elastomer, the adhesion layer provides dry physical self-adhesion force by using propylene-based polyolefin elastomer, the surface rheological behavior is adjusted by using fluoropolymer processing aids in each layer, and a stepwise temperature rising extrusion and air knife pinning quenching process is adopted for forming.

The application relates to a boron-containing resin type wide-temperature-range damping additive and a preparation method and application thereof, and belongs to the technical field of organic silicon damping materials. The boron-containing resin type wide-temperature-range damping additive comprises: A) an organic silicon resin matrix with a three-dimensional network structure; B) a boron-containing functional structure connected with the organic silicon resin matrix; and C) an aryl-containing functional structure connected with the organic silicon resin matrix. The boron-containing functional structure is connected to the surface of the three-dimensional network structure of the organic silicon resin matrix through a Si-O-B bond; the aryl-containing functional structure is located on the surface of the three-dimensional network structure of the organic silicon resin matrix; the molecular weight of the organic silicon resin matrix is 1000-10000; and the organic silicon resin matrix is selected from one or more of MQ resin, MT resin, MTQ resin, MDT resin and POSS silicon resin. The application improves the high-temperature dissipation capacity and wide-temperature-range damping performance of the damping material through the synergistic effect of the rigid silicon resin and the surface boron-containing dynamic structure, and takes into account the compatibility and mechanical stability.

The invention discloses a high-temperature temperature-adjusting type weak-crosslinking stable-form phase-change elastomer material, a preparation method thereof and application of the high-temperature temperature-adjusting type weak-crosslinking stable-form phase-change elastomer material in modified asphalt, and relates to the technical field of phase-change temperature-adjusting materials and asphalt materials for road engineering. The raw material component system of the high-temperature temperature-regulating type weak-crosslinking stable-form phase-change elastomer material comprises a continuous phase matrix component, a cross-linking component, a cross-linking component, a cross-linking component and a cross-linking component, the phase change component is used for realizing molecular level confinement in an interpenetrating network structure formed by the continuous phase matrix component through low-density covalent cross-linking points of the phase change component and inhibiting migration and leakage of the phase change component in a molten state; the weak cross-linking initiating component is used for initiating formation of a weak cross-linking three-dimensional network in the continuous phase matrix component, and the system is endowed with a stable phase change structure while the thermoplastic processability of the system is kept. When the material is used as a modifier to be doped into matrix asphalt, the high-temperature temperature regulation function of an asphalt pavement can be realized, and meanwhile, the mechanical and rheological properties of the modified asphalt are improved.

This invention belongs to the technical field of thermoelectric materials and functional polymer materials, specifically relating to a thermoelectric hydrogel based on the synergistic enhancement of zwitterionic and polar solvents, its method, and applications. The thermoelectric hydrogel is obtained by polymerizing a precursor solution to form a gel matrix, followed by immersion in an immersion solution to introduce a potassium ferrocyanide / potassium ferrocyanide redox couple. The precursor solution is prepared by mixing acrylamide, N-isopropylacrylamide, dimethyl sulfoxide, N,N-dimethylformamide, 1-ethyl-3-methylimidazolium tetrafluoroborate, the zwitterionic monomer [2-(methacryloyloxy)ethyl]dimethyl-(3-sulfonic acid propyl)ammonium hydroxide, the crosslinking agent N,N'-methylenebisacrylamide, a photoinitiator, and deionized water. This invention prepares a thermoelectric hydrogel with high mechanical strength, high ductility, and a high Seebeck coefficient, and also exhibits good temperature resistance.

The invention discloses a preparation method and application of disulfide bond-based infrared light / temperature intelligent double-response hydrogel, and belongs to the technical field of hydrogel. The invention aims to solve the problems that the existing hydrogel material generally has an irreversible cross-linked structure, mechanical properties and response performance are difficult to consider, a single stimulation response mode is adopted, and complex application requirements are difficult to meet. The method comprises the following steps: synthesizing a disulfide bond-containing cross-linking agent N, N '-diacryloyl-L-cystine (BISS), constructing a dynamic network structure through free radical polymerization and hydrogen bond synergistic cross-linking by taking the BISS, an N-isopropylacrylamide monomer and polyvinyl alcohol as main raw materials, and introducing magnetic ferroferric oxide particles into one layer to form a double-layer heterogeneous hydrogel system. Compared with single-response hydrogel, the hydrogel has the advantages that a multi-stimulation driving mode is realized, and compared with single-response hydrogel, the hydrogel can be driven by regulating and controlling the stimulation position, intensity and time sequence, and the direction, amplitude and speed of deformation can be precisely controlled in a programmable and repeatable manner.

The present disclosure relates to a solid electrolyte battery including a positive electrode, a negative electrode and a separator interposed between the positive electrode and the negative electrode, wherein the negative electrode includes: a negative electrode current collector; a first negative electrode active material layer formed on at least one surface of the negative electrode current collector and including a first negative electrode active material, a first solid electrolyte and a first electrolyte salt; and a second negative electrode active material layer formed on the first negative electrode active material layer and including a second negative electrode active material, a second solid electrolyte, a second electrolyte salt and a plasticizer having a melting point of 30-130°C, the solid electrolyte battery is activated at a temperature between the melting point of the plasticizer and 130°C, and a solid electrolyte interface (SEI) layer is formed on the surface of the second negative electrode active material. The present disclosure also relates to a battery module including the solid electrolyte battery.

The application discloses a preparation method of an air absorption composite material with high adsorption capacity, belongs to the field of adsorption material preparation, and aims at solving the technical problem that the adsorption capacity and structural stability of the air absorption composite material in the prior art need to be further improved, and specifically comprises the following steps: stirring hybrid sol, epoxy-based silane grafted UiO-66 and modified polyether amine curing agent in a reaction kettle, heating the reaction kettle to 25-35 DEG C, and keeping the temperature and stirring for 30-60 min; and obtaining air absorption composite slurry through post-treatment; the hybrid sol, the epoxy-based silane grafted UiO-66 and the modified polyether amine curing agent are blended, then an organic-inorganic interpenetrating network is formed through epoxy-amine ring-opening addition curing, and the air absorption composite material with high adsorption capacity is obtained through segmented temperature rising activation.

This invention provides a high-toughness thermal insulation epoxy resin, a composite material, and a method for preparing the same. The high-toughness thermal insulation epoxy resin is prepared from raw materials comprising: component A and component B; the mass ratio of component A to component B is 95~150:80~120; component A comprises: 62~150 parts epoxy resin and 8~15 parts toughening agent; component B comprises: 25~45 parts curing agent, 0.3~0.8 parts antioxidant, 12~28 parts additives, and 32~50 parts lightweight filler; the additives are at least one of nano-titanium dioxide and silicon-titanium stacked composite microspheres. The addition of additives to this epoxy resin and composite material allows for synergistic effects with the low thermal conductivity of the lightweight filler, achieving high-efficiency thermal insulation. The additives also absorb energy through interlayer slip and strengthen interfacial bonding through hydrogen bonding with the epoxy resin matrix and glass microspheres, improving the material's mechanical properties. Furthermore, the addition of toughening agents and antioxidants enhances the mechanical properties and anti-aging properties of the composite material.

The invention belongs to the technical field of automobile materials, and discloses a PC / ABS composite material and a preparation method thereof, the PC / ABS composite material comprises the following components by weight: 40-80 parts of polycarbonate resin, 10-40 parts of an acrylonitrile-butadiene-styrene copolymer, 2-10 parts of a methyl methacrylate-butadiene-styrene copolymer, 0.5-5 parts of an odor adsorbent, 0.1-1 part of an antioxidant, and 0.2-1.5 parts of a lubricant. The polycarbonate resin and the acrylonitrile-butadiene-styrene copolymer are synergistically combined, the methyl methacrylate-butadiene-styrene copolymer is introduced, and the synergistic effect of the porous odor adsorbent, the antioxidant and the lubricant is matched, so that the mechanical property and the heat resistance are maintained, and meanwhile, the mechanical property and the heat resistance are improved. The release amount and the peculiar smell intensity of small molecule volatile matters in the processing and using processes of the material are reduced, and the long-term stability of the volatile release performance is enhanced.

This invention discloses a continuous dispersion and heat-damage-preventing drying process for wet carbon fiber materials, belonging to the field of carbon fiber drying technology. The process includes: obtaining the initial moisture content of the wet carbon fiber material and determining the drying process parameters; filtering and heat-exchanging the process gas to form a drying medium; feeding the wet carbon fiber material into a zoned cooling Venturi tube for high-speed deagglomeration and dispersion, and cooling and temperature control of the throat area of ​​the Venturi tube; allowing the deagglomerated gas-solid mixture to enter a staged expansion flash tube for flash drying; subsequently, entering a cyclone dryer for suspension deep drying, and detecting the moisture content of the bottom discharge, adjusting the feed rate, flash heating charge, and return ratio based on the detection results; the dust-laden hot gas discharged from the cyclone dryer is purified by a bag filter, and the recovery ratio is adjusted according to the dew point and temperature of the purified hot gas. This invention can reduce the risk of material agglomeration and localized heat damage, and improve drying uniformity, moisture content stability, and thermal energy utilization.

A garment material 40 includes: a first layer, wherein the first layer is a molding polymer; a second layer, wherein the second layer is a molding polymer 46 disposed at one or more locations on the first layer, the second layer taking the shape of the first layer at the one or more locations; and a textile layer; wherein the second layer is located between the first layer and the textile layer; wherein the second layer includes a lining 48 embedded in the molding polymer of the second layer, the lining being formed of yarn and having gaps through the lining, and wherein: the yarn of the lining has a unit length weight of 10 to 60 denier; and the lining has a weight of 5 to 35 g / m² in the garment material or in areas of the garment material. 2 Weight per unit area.