15results about How to "Improve mechanical durability" patented technology

The invention discloses a Schiff base modified silane / polyurethane antifouling coating as well as a preparation method and application thereof. The preparation method comprises the following steps: S1, carrying out dehydration reaction on an aldehyde substance and amino silane, and hydrolyzing to prepare a Schiff base modified silane monomer; s2, dewatering polyether glycol, uniformly mixing the dewatered polyether glycol with diisocyanate, and carrying out cooling reflux under the conditions of stirring and 60-80 DEG C to obtain a polymer A; s3, uniformly mixing the polymer A, a Schiff base modified silane monomer, a solvent and a dibutyltin dilaurate catalyst, and reacting to obtain a polymer B; and S4, coating a base material with the polymer B, and curing to obtain the coating. The anti-fouling coating has a good anti-fouling effect, the coating can effectively inhibit growth of marine fouling organisms based on Schiff base, the active anti-fouling requirement of the coating can be met, meanwhile, the coating has good base material adhesion and wear resistance, and the service life of the coating is guaranteed.

The utility model relates to a bendable electrochromic device, and belongs to the field of electrochromic devices.The bendable electrochromic device comprises a first transparent base material layer, a first bonding layer fixedly bonded to the lower surface of the first transparent base material layer and a first transparent conductive layer arranged on the lower surface of the first bonding layer, and a reinforcing toughness assembly is arranged on the lower surface of the first transparent conductive layer; the reinforcing toughness assembly comprises a plurality of transverse reinforcing ribs which are fixedly connected to the lower surface of the first transparent conductive layer, and the outer portions of the transverse reinforcing ribs are fixedly connected with a plurality of vertical reinforcing ribs. According to the bendable electrochromic device, the transverse reinforcing ribs and the vertical reinforcing ribs are arranged, so that the toughness of the electrochromic device body during bending is improved, the electrochromic device body is prevented from being broken or damaged in the bending process, and the mechanical durability of the electrochromic device body is good; the performance and the attractiveness of the electrochromic device body are guaranteed, and the advantage of being bendable is achieved.

Disclosed are a polymer electrolyte membrane and a membrane-electrode assembly comprising same, the membrane having, without a deterioration in performance such as ion conductivity, excellent mechanical properties, so as to ensure the manufacture of a membrane-electrode assembly having such high durability that the wet / dry cycle, which is measured according to accelerated durability test method of a NEDO protocol, is 30,000 times or more. The polymer electrolyte membrane of the present invention comprises: a porous support having a plurality of pores; and a composite layer including ionomers that fill the pores, wherein the ratio (IS / FS) of the stab initial strain (IS) of the polymer electrolyte membrane to the stab final strain (FS) of the polymer electrolyte membrane is 0.4 to 1.0.

Disclosed are: a polymer electrolyte membrane which can guarantee the production of a membrane-electrode assembly having excellent mechanical properties without a decrease in performance, such as in ionic conductivity, and thus having a high enough durability to achieve at least 30,000 wet / dry cycles as measured according to the NEDO protocol; a membrane-electrode assembly including the polymer electrolyte membrane; and a method for measuring the durability of the membrane-electrode assembly. The polymer electrolyte membrane according to the present invention comprises a composite layer including: a porous support having multiple pores; and ionomers filling the pores, and has an MD internal tearing strength of 150 N / mm or greater, a TD internal tearing strength of 150 N / mm or greater, a stab initial strain of 8% or less, and a stab final strain of 10% or less.

This invention provides a triboelectric nanogenerator and its fabrication method. The generator operates in a vertical contact-separation mode, with a positive friction layer of PET film and a negative friction layer of PDMS composite film with a single layer of dense SiO₂ microspheres inserted on its surface. The fabrication process employs a two-step spin-coating method: first, a PDMS solution is spin-coated onto a substrate; then, a suspension of SiO₂ microspheres is spin-coated onto the uncured surface. After heating and curing, a composite negative friction layer is formed, which is then assembled with electrodes and a support structure. This invention significantly increases the triboelectric contact area and enhances charge trapping capability by constructing the SiO₂ microsphere insertion layer, thereby greatly improving output performance. Furthermore, the fabrication process is simple and low-cost, making it suitable for powering microelectronic devices and self-powered sensing applications.

The present application relates to ion exchange membrane technical field, particularly to a kind of low swelling crosslinked poly (arylene-quininium salt) anion exchange membrane and preparation method thereof.Poly (arylene-quininium) polymer is dissolved in first organic solvent, and halogenated poly (arylene-alkylene) polymer is added as macromolecular ionization reagent, and quininium group in partially ionized poly (arylene-quininium) polymer is then added with excess small molecule ionization reagent to make quininium group completely ionized, to obtain crosslinked poly (arylene-quininium salt) polymer solution.The obtained crosslinked poly (arylene-quininium salt) polymer solution is added to first precipitant to obtain crosslinked poly (arylene-quininium salt) polymer powder, and it is dissolved in second organic solvent to obtain polymer solution, coated on homogeneous substrate or porous substrate, dried to obtain low swelling crosslinked poly (arylene-quininium salt) anion exchange membrane.The present application uses halogenated poly (arylene-alkylene) as macromolecular crosslinking agent to construct crosslinked network in poly (arylene-quininium salt) ion polymer, so that the obtained crosslinked poly (arylene-quininium salt) anion exchange membrane shows low swelling, high mechanical strength, high alkali resistance and outstanding gas barrier property.

The application relates to the technical field of high-molecular fiber sensing, in particular to a high-toughness TPU / ANF / inorganic nanoparticle composite nanometer friction positive electrode material and a preparation method thereof. The preparation method takes TPU as a base main material, does not depend on a chemical cross-linking method, and realizes flexible adaptation of a complex deformation scene by virtue of excellent stretchable deformation performance and flexible characteristics of the TPU. Meanwhile, aramid nanofiber (ANF) is introduced as a reinforcing phase, the high-strength and high-modulus characteristics of the aramid nanofiber are utilized to improve the stress and strain capacity and mechanical stability of the base, the aramid nanofiber can lock the molecular structure in the TPU, and the aramid nanofiber can inhibit significant shrinkage of the material when the temperature is increased, so that the aramid nanofiber has the dual functions of mechanical enhancement and size stability, and the reliability of a generator is ensured.

The application discloses a kind of durable double-layer composite super-hydrophobic ice-repellent coating and its preparation method and application, belong to coating material technical field.The coating includes epoxy resin bonding layer and composite functional layer arranged in sequence;The preparation raw materials of epoxy resin bonding layer include epoxy resin, first curing agent and first organic solvent;The preparation raw materials of composite functional layer include polydimethylsiloxane, second curing agent, inorganic micro-nano particles and second organic solvent;Inorganic micro-nano particles include nanometer silica particles and micro-nano level metal element X oxide particles, X includes at least one of Al and Ti.The durable double-layer composite super-hydrophobic ice-repellent coating has higher interfacial adhesion and particle stability, also has better mechanical durability, chemical stability and long-term ice-repellent performance, and can be applied to glass, concrete, metal, power transmission line, wind power blade, traffic facilities, building outer surface and low-temperature service equipment and other aspects of ice-repellent protection.

The present invention discloses a magnetic latching relay with auxiliary contacts, comprising an auxiliary contact part, a push card and a base; one side of the push card is provided with a second card slot with a lateral opening; the auxiliary contact part comprises an auxiliary moving spring and an auxiliary moving contact; the auxiliary moving contact is fixed on the auxiliary moving spring and the position where the auxiliary moving spring fixes the auxiliary moving contact can swing relative to the root of the auxiliary moving spring; at the position where the auxiliary moving spring fixes the auxiliary moving contact, an auxiliary moving spring extension piece is also extended in the direction of the second card slot on one side of the push card, and the end of the auxiliary moving spring extension piece is adapted in the second card slot, so that the push card can drive the auxiliary moving contact to move when it moves back and forth to realize the closing or separation of the auxiliary contact. The present invention can improve the indication state reliability, enhance the assembly reliability and enhance the mechanical durability of the auxiliary moving spring, thereby effectively ensuring the electrical service life of the magnetic latching relay.

The application provides a heat-resistant and moisture-resistant degradable PLA adhesive tape, which has a four-layer structure and comprises an inner layer, a substrate layer, a functional layer and a protective layer; the inner layer is a degradable pressure-sensitive adhesive with high viscosity and certain hydrophobicity; the substrate layer is a degradable PLA film or a PLA and PBAT blended film; the functional layer is an electrospun layer, and the electrospun layer is a gradient electrospun film containing CaSO3 with different concentrations; the water absorption salt content is low near the substrate side and high near the outer surface side; and the protective layer is a long-chain silane modified SiO2. The application constructs a wettability gradient distribution from inside to outside, i.e. a hydrophobic substrate-hydrophilic gradient layer-super-hydrophobic outer layer, by using the electrospinning technology; the capillary suction effect of the hydrophilic layer is used to realize the one-way discharge of the edge infiltration of water; and the heat reflection and physical barrier mechanism of the super-hydrophobic coating of the outer layer are combined to synergistically improve the heat resistance and moisture resistance of the adhesive tape, so that the use requirement in a complex environment is met.

The utility model provides a high-frequency electro-cautery instrument with a turnover screen, which relates to the technical field of high-frequency electro-cautery instruments, and comprises a case, a movable base and a turnover screen component, an angle control component consisting of a dial plate, a tension spring, a positioning rack and a fixed toothed plate is adopted, and stepless adjustment of the angle of the screen is realized by pulling down the dial plate. After being loosened, the screen is automatically meshed and locked, so that a medical worker can quickly adjust the screen to the optimal visual angle with one hand, meanwhile, the screen is stable and does not deviate after being adjusted, flexibility and safety are both considered, and the requirement for real-time parameter monitoring in an operation is particularly met; secondly, through the linkage design of multiple connecting rods, rotating shafts and hinges, the screen can be turned over around the case in multiple dimensions through the case connecting assembly, through cooperation with a universal wheel structure of the movable base, view angle adaptation of different operation body positions and operation heights can be met, flexible transfer of equipment in an operating room can be achieved, the use scene is remarkably expanded, and the operating efficiency is improved. Meanwhile, the operation efficiency and the operation precision are also improved.

Provided is a catalyst layer for fuel cell having improved heat-dissipating performance and durability. The catalyst layer for fuel cell according to the present invention is a catalyst layer for fuel cell comprising a first composite and a second composite, wherein the first composite includes: a supporting material, a catalyst including metal particles supported on the supporting material, and a first ionomer coated on the surface of the catalyst; the second composite includes a heat-dissipating material and a second ionomer, the second ionomer is not coated on the surface of the catalyst, and the first ionomer and the second ionomer are identical with or different from each other.

The invention discloses a regulation and control method of a single-stage microporous metal oil-water separation membrane with high permeability and high selectivity, which comprises the following steps of: 1, obtaining a aesthetic formula and empirical parameters a, b and c through a gradient experiment; 2, deducing a minimum value of f according to empirical parameters a, b and c to obtain a corresponding R / D; and 3, obtaining the single-stage microporous metal oil-water separation membrane with high permeability and high selectivity by adopting the obtained R / D. According to the single-stage microporous metal oil-water separation membrane designed by adopting a structure-function integrated scheme, the seesaw effect between high selectivity and high permeability is broken through, the flux bottleneck of a nano ceramic / micron metal porous separation membrane is broken through, and the actual wetting state is continuously and quantitatively described by a proposed aesthetic formula; the microporous membrane is high in strength, good in mechanical durability and free of coating stripping risk, upgrading and optimization of the metal oil-water separation membrane are accelerated, and technical support is provided for cost reduction and efficiency improvement of industrial mixed fluid filtration.

Disclosed are a polymer electrolyte membrane having high flexibility, high ionic conductivity, and excellent mechanical durability, a method for manufacturing same, and an electrochemical device comprising same. The polymer electrolyte membrane of the present invention comprises a polymer electrolyte material, wherein the polymer electrolyte material comprises: an ion conductor having an ion-exchange group; and an organic compound which binds to the ion-exchange group via an ionic bond or a hydrogen bond, thereby allowing the polymer electrolyte material to have an ionic crosslink structure or a hydrogen bond crosslink structure.

The invention discloses a three-gradient microstructure flexible pressure sensor and a preparation method and application thereof, and aims to provide a sensor which is clear in structural design and can realize wide linear range, high sensitivity and high stability, a preparation method of the sensor, and application of the sensor in micro-pressure signal detection and plant physiological monitoring. The sensor comprises a sensing layer, an electrode layer and a hollow supporting layer, the sensing layer comprises an elastomer substrate with a three-gradient microstructure and a conductive film layer covering the surface of the three-gradient microstructure; the elastomer substrate is prepared by the following steps: spin-coating a flexible precursor solution on the surface of a mold, carrying out vacuum defoaming, heating and curing, and stripping to obtain the elastomer substrate with a three-gradient convex structure; the flexible precursor solution is composed of a polydimethylsiloxane solution and a single-layer MXene dispersion liquid; and the mass content of the MXene in the elastomer solid matrix is 2.5%-8%. The sensor is excellent in comprehensive sensing performance and has high stability and reliability.