23results about How to "Increase energy dissipation" patented technology

The invention discloses degradable tough epoxy resin with a cation-pi effect and a preparation method of the degradable tough epoxy resin. The epoxy resin is composed of multi-arm mercaptan containing ester groups, ionic liquid containing unsaturated double bonds and with the cation-pi effect and epoxy resin. According to the present invention, the multi-arm mercaptan containing the ester group, the unsaturated double bond ionic liquid and the epoxy resin can be combined through the light-heat dual curing process to construct the high toughness degradable epoxy resin system, and the whole method is green, simple and easy to operate. The energy dissipation capacity of the epoxy resin containing the cation-pi action is remarkably improved when the epoxy resin is stimulated by the outside, and cation-pi action sites uniformly dispersed in a network play a key role in the balance of rigidity and toughness under repeated loading-unloading circulation. Besides, ester groups in the structure enable the synthesized epoxy resin to have excellent degradation performance, hydrogen atoms in imidazole and the ester groups can form intermolecular hydrogen bonds, the degradation process of the resin is accelerated, and rapid degradation under the amine / alkaline condition is achieved.

The invention relates to a self-repairing waterborne polyurethane composite elastomer based on dynamic interface reinforcing and toughening as well as a preparation method and application thereof, and belongs to the technical field of self-repairing high polymer materials. The method comprises the following steps: preparing a waterborne polyurethane emulsion; the preparation method comprises the following steps: uniformly dispersing polyvinylpyrrolidone in an ethanol solution, adding polyfunctional mercaptan and polyfunctional isocyanate, and adding an amino-containing imidazole monomer to obtain microsphere powder; and uniformly dispersing the microsphere powder in a waterborne polyurethane emulsion, adding a metal salt solution, and then volatilizing water to form a film material, thereby obtaining the self-repairing waterborne polyurethane composite elastomer based on dynamic interface reinforcement and toughening. The self-repairing waterborne polyurethane elastomer with excellent comprehensive performance is obtained by designing the structure of waterborne polyurethane, modifying the surface of the microsphere and introducing a dynamic interface for compounding, and the strength, the toughness and the self-repairing capability of the elastomer are simultaneously improved.

According to the fabricated steel frame structure system, the inserted high-strength concrete grouting columns and the easily-assembled cold-formed thin-walled steel combined anti-seismic beams are adopted, and prefabrication and assembly are facilitated. The earthquake response is reduced through the replaceable safety piece set, the disc spring damper and the self-resetting hydraulic supporting rod set, and rapid function recovery is achieved. According to the system, a floor and a floor beam are poured into integral rigid connection, and a PVC joint pulling plate is adopted for connecting a filler wall. High-strength concrete grouting enhances column connection and bearing capacity, and cold-formed thin-walled steel members improve production efficiency and reduce cost. The disc spring damper reduces vibration of the double-beam structure and improves energy dissipation capacity. The replaceable safety piece and the web plate are connected to protect the main body structure, and the self-resetting hydraulic supporting rod enhances the structural stability. The beam end inserting plates and the inserting grooves are rapidly assembled, and the anti-seismic performance of the joint is improved. The PVC joint pulling plate prevents the wall body from being pressed and cracked, and the material consumption of the cast-in-place hollow concrete wall is reduced. The floor and the floor beam are integrally poured to increase the structural rigidity and improve the lateral force resistance and the anti-seismic performance.

The invention discloses an imine-based high-performance ultraviolet shielding photoresist and a preparation method thereof. The preparation method comprises the following steps: preparing an intermediate imino diphenol, and synthesizing an imino comonomer by using the intermediate imino diphenol; blending the imino comonomer with resin to obtain a photoresist precursor; and blending the photoresist precursor and an initiator to obtain the photoresist with excellent ultraviolet shielding capability and mechanical properties. According to the prepared imino comonomer containing the imino group and the urethane group, the urethane group provides a hydrogen bond site to increase compatibility, imine induces to form pi-pi accumulation, the formation of the hydrogen bond and the pi-pi accumulation enables the energy required by transition of a system from HOMO to LUMO to be reduced, and the ultraviolet shielding capability of a polymer is improved; the imine and benzene ring conjugated rigid skeleton enhances the strength of the polymer; the weak interaction between molecules increases the energy dissipation capability of the polymer, and the cured photoresist has excellent ultraviolet shielding performance and mechanical properties, and has very wide application prospects.

The invention discloses a hydrogen bond enhanced hydrogel fiber, a preparation method and application. The preparation method comprises the following steps: preparing a tamarind polysaccharide solution, adding acrylamide, mixing to obtain a first precursor solution, adding chitosan to obtain a second precursor solution, adding zinc sulfate heptahydrate, an initiator and a cross-linking agent to obtain a hydrogel precursor solution, injecting the hydrogel precursor solution into a capillary tube, and polymerizing and demolding. The tamarind polysaccharide and the chitosan are introduced, and multiple hydrogen-bond interaction and molecular chain entanglement between hydroxyl / amino of the tamarind polysaccharide and the chitosan and a polyacrylamide chain segment are utilized to construct a physical-chemical dual-network enhancement system, so that the structural stability, the deformation resistance and the energy dissipation performance of the fiber are improved; a zinc salt-containing system forms a continuous ion transmission channel, so that the material is endowed with excellent ionic conductivity and stable electrical response. The obtained fiber is simultaneously used as a flexible sensing unit and a zinc ion battery gel electrolyte, sensing-energy storage integration is realized, and miniaturization integration of devices is facilitated.

The invention discloses a displacement amplification type tuned mass inerter damper for a fan blade and an installation method of the displacement amplification type tuned mass inerter damper. The displacement amplification type tuned mass inerter damper comprises a tuned mass inerter damper body, the fan blade, a steel wire rope and an According to the tuned mass inerter damper, infinitesimal displacement generated by vibration of a fan blade is amplified through the displacement amplification type vibration reduction mechanism according to the lever principle, the inerter disc is driven to do vertical reciprocating motion on the screw rod, the inerter disc and the vibration reduction control spring generate damping force and elastic force, and meanwhile when the rotating speed of the blade changes, the vibration reduction effect is achieved. The centripetal force generated by the tuned mass inerter damper in the direction of the connecting line from the blade tip to the blade root and the gravity of the inerter disc in the direction of the screw also change, and therefore displacement generated by vibration of the fan blade is effectively controlled, and energy dissipation and vibration reduction are achieved. In addition, in the direction perpendicular to the connecting line of the blade tip and the blade root, damping force generated by rotation of the inerter disc when the fan blade vibrates can effectively restrain the inertial effect of the overall structure of the damper, and therefore the efficiency of energy dissipation and vibration control is further improved.

The present invention relates to an ultra-black composite coating based on carbon nanomaterials and a preparation method thereof, and belongs to the technical field of coatings. The preparation method of the present invention comprises the following steps: S1, dissolving carbon nanoparticle color paste, multi-walled carbon nanotube color paste, and graphene color paste in water and stirring evenly, and then adding a binder, a metal oxide filler, a thickener, a defoamer, and an auxiliary agent and stirring evenly to obtain a composite ink; S2, using a spraying technology or an ink direct writing 3D printing technology to make a composite coating on the surface of a substrate with the composite ink; S3, freezing the composite coating with liquid nitrogen through a self-adsorption flat plate freezer, and then freeze-drying it through a freeze dryer, and obtaining the ultra-black composite coating based on carbon nanomaterials through plasma surface treatment, and constructing a flexible, large-area ultra-black composite coating with a vertically ordered micro-nano honeycomb light-trapping structure based on carbon nanomaterials.

The invention provides silicon nitride core-shell coated powder, ceramic prepared from the silicon nitride core-shell coated powder and a preparation method of the silicon nitride core-shell coated powder, the silicon nitride core-shell coated powder is of a double-layer structure and is composed of silicon nitride, a sintering aid and titanium nitride, the silicon nitride serves as a matrix, the surface of the matrix is coated with the sintering aid, the surface of the sintering aid is coated with the titanium nitride, and the surface of the sintering aid is coated with the titanium nitride. The preparation method comprises the following steps: mixing spherical silicon nitride subjected to spray drying with a sintering aid by a dry method, and pre-sintering, so as to obtain silicon nitride matrix coated powder; and carrying out dry mixing on the titanium nitride and the silicon nitride matrix coated powder, and sintering to prepare the ceramic with the uniform network structure. Silicon nitride is used as a matrix, and a uniform three-dimensional network structure is introduced into the matrix, so that the mechanical property and the electromagnetic property of the ceramic material are optimized at the same time.

The invention relates to the field of polymer modified cement-based materials, in particular to composite latex for modifying a cement-based material and a preparation method of the composite latex. Starting from the composition structure design of the composite latex, the energy dissipation capacity is improved by introducing the inorganic nanoparticles into the polymer microspheres, the damping performance after film forming is better, the damping temperature range is wider, and the toughening and impact-resistant modification effects on a cement-based material are better. Wherein the inner layer is mainly composed of soft monomers, vibration energy dissipation of inorganic nanoparticles is facilitated, meanwhile, a large number of branched chain structures are introduced into an inner layer polymer, intermolecular slippage can be increased, the latex film loss factor can be increased, and the toughening modification effect on the cement-based material is further improved; the middle layer is mainly composed of hard monomers, certain strength is kept, and a space is provided for vibration energy dissipation of internal particles; the outer layer is mainly composed of soft units, so that the composite latex has a good film forming effect and a good bonding effect in a cement-based material. The composite latex prepared by the invention is simple in preparation process, has small influence on the working performance of a cement-based material mixture, and can obviously improve the fracture energy of a cement-based material hardened body under the condition of low mixing amount.

The application is suitable for the field of drip irrigation equipment, and provides a micro-gravity variable water irrigator and an irrigation method thereof. First, water flows into the flow channel part through the water inlet of the water irrigator, the water flow in the flow channel part is disturbed by the side wall micro-protrusion structure, the water flow energy dissipation is increased, under the condition of ultra-low pressure water head (0.5-1 m), that is, with the help of small position difference of water source, the traditional power energy is not needed, and the water irrigator can be laid for a long distance; the preferential flow channel structure of the micro-gravity water irrigator does not have a low-speed area, the anti-blocking performance is greatly improved, and the dependence of the drip irrigation system on water source filtration is reduced; in addition, different working pressures can be used to realize various scene applications such as irrigation, salt pressing and underground drip irrigation, and the problems that the traditional water irrigator and drip irrigation belt cannot be effectively applied under the condition of limited traditional power energy and complex water quality in the rainwater collection irrigation area in China are solved.

The utility model discloses a 3D printing imitated tenon-and-mortise structure interlocking type viscoelastic shock absorber which comprises an upper connecting plate, a lower connecting plate, a shock absorption original part and a right-angle fixing plate, and the shock absorption original part is of an imitated tenon-and-mortise structure and comprises a left side steel plate, a right side steel plate, a middle steel plate and 3D printing viscoelastic materials. The upper connecting plate is fixedly connected with the middle steel plate through the right-angle fixing plate, and the lower connecting plate is fixedly connected with the left side steel plate and the right side steel plate through bolts. The flat-interface shock absorber has the advantages that a traditional tenon-and-mortise structure and an existing 3D printing technology are fused, the steel plate and the viscoelastic material are connected through the specific interlocking capacity of the tenon-and-mortise structure, high resistance to pullout force is provided, and compared with a traditional flat-interface shock absorber, the flat-interface shock absorber can achieve high-energy dissipation. And by adjusting the design parameters of the tenon-and-mortise structure, a greater degree of freedom can be provided for optimization design.

This invention discloses a double-layer clamp for aircraft piping with nonlinear vibration reduction function. The device includes an inner clamp, an outer clamp, clamp gaskets, fastening bolts, and fastening nuts. A certain constraint gap exists between the inner and outer clamps. Both the inner and outer clamps are assembled to the aircraft body using fastening bolts and nuts. The inner clamp consists of an inner clamp metal band and an inner clamp bushing; the outer clamp also consists of an outer clamp metal band and an outer clamp bushing. Both the inner and outer clamp bushings are made of nitrile rubber-organic small molecule hybrid composite material, exhibiting excellent damping performance. This invention utilizes the outer clamp to provide nonlinear constraint stiffness and nonlinear constraint damping to achieve nonlinear vibration reduction, enabling wide-frequency vibration reduction and effectively improving the vibration reduction performance of traditional single-layer clamps. This device is easy to manufacture and install, employs a nonlinear passive vibration control strategy, and achieves high efficiency at low cost.

The application provides a nano-bubble-based capsule vibration isolation system, and belongs to the field of vibration isolation devices.The nano-bubble-based capsule vibration isolation system comprises a vibration isolation capsule, the inside of the vibration isolation capsule is filled with buffer liquid and solid particles, at least part of the surfaces of the solid particles are attached with nano-bubbles, and bubble-attached particles are formed; wherein the bubble-attached particles are configured to collide under the action of elastic waves of a vibration source, so that the nano-bubbles on the surfaces of the bubble-attached particles are broken, the bubble-attached particles generate internal energy based on the friction of the collision and the breaking of the bubbles to increase the energy dissipation of the elastic waves, so as to perform vibration isolation treatment on the elastic waves of the vibration source; and a preparation device is configured to prepare nano-bubbles based on a target generation rate under the control of a far-infrared control signal, and input the nano-bubbles into the inside of the vibration isolation capsule through the lower surface of the vibration isolation capsule, so as to change the concentration of the bubble-attached particles in the inside of the vibration isolation capsule.

The present application relates to the technical field of medical packaging materials, and provides a wet non-woven fabric-based medical sterilization packaging composite material and a preparation method thereof, which comprises a wet non-woven fabric layer subjected to densification and reinforcement treatment, a heat-sealing film layer, and an adhesive layer arranged between the two layers, wherein the adhesive layer is distributed in a non-continuous pattern to locally composite the wet non-woven fabric layer and the heat-sealing film layer. Through the synergistic design of densification reinforcement and local composite in a non-continuous pattern, the present application reduces the shedding rate while retaining the air permeation channels in the un-composite area, solves the contradiction between high density and high air permeability, and effectively disperses stress through discrete adhesive structures, thereby realizing the unity of low shedding, high air permeability and stable peeling strength.

The invention discloses a catechol group-containing epoxy resin toughness curing agent and a preparation method thereof.According to the method, a catechol group-containing thiol / carboxylic acid / amine epoxy resin curing agent is synthesized through a two-step method, and sites are provided for formation of further reversible catechol metal coordination bonds in a cross-linked network; and preparing the epoxy resin material containing the double cross-linked network through ring-opening reaction between sulfydryl and epoxy group, carboxyl and epoxy group or amino and epoxy group. The energy dissipation capacity of the epoxy resin material containing the coordination network is remarkably improved when the epoxy resin material is stimulated by the outside, and the catechol metal coordination structure uniformly dispersed in the network plays a key role in the balance of the rerigidity and the toughness under repeated loading-unloading cycles. In addition, the introduction of catechol metal coordination bonds causes the change of the ultraviolet absorption wavelength of the epoxy resin, and the epoxy resin can be used as a photothermal conversion material. According to the invention, the application of the thermosetting epoxy resin in the advanced fields of flexible robots, self-adaptive equipment and the like has important significance.

This application discloses a superstretchable ionic gel, its preparation method, and its application, belonging to the field of ionic gel technology. The preparation method of the superstretchable ionic gel includes: dissolving an olefin monomer in water, adding a biopolymer and a metal salt, and stirring until homogeneous to obtain a precursor liquid A; then mixing the ionic liquid with an organic solvent, adding a thermal initiator, and stirring until homogeneous to obtain a precursor liquid B; then mixing the precursor liquid A and the precursor liquid B until homogeneous, pouring the mixture into a reaction mold, and polymerizing at 25-80°C for 3-48 hours to obtain the superstretchable ionic gel. This application solves the technical problem of poor stretching properties in conventional ionic gels.

The invention relates to the technical field of damping devices, in particular to a modular multi-stage unit design anti-impact structure which comprises a shell unit, a plurality of first energy dissipation units are arranged in the shell unit, the first energy dissipation units are connected through flexible materials, and the first energy dissipation units can relatively slide in the shell unit. A plurality of second energy dissipation units are arranged in the first energy dissipation unit, and the second energy dissipation units can collide and extrude one another in the second energy dissipation units. Relative movement between the first energy dissipation units is hindered through restraining force of the flexible materials, external impact loads are absorbed and consumed, and the energy dissipation capacity of the whole structure is enhanced. And through mutual collision and extrusion of the second energy dissipation units in the first energy dissipation units, the energy dissipation efficiency of the whole structure is further improved, the external impact load is effectively and rapidly dissipated, and the impact resistance of the whole structure is improved.

The invention relates to a sustainable waterproof mildew-proof soybean protein adhesive and a preparation method thereof, and belongs to the technical field of soybean protein adhesives. The sustainable waterproof mildew-proof soybean protein adhesive is prepared from the following raw materials in parts by mass: 15 to 35 parts of soybean meal, 55 to 75 parts of water, 2 to 6 parts of cross-linking agent, 0.1 to 0.5 part of sodium carboxymethyl cellulose and 0.5 to 2 parts of ethyl lauroyl arginate hydrochloride. According to the invention, sodium carboxymethyl cellulose, ethyl lauroyl arginate hydrochloride and a cross-linking agent are introduced into a soybean meal system, so that the sustainable water-resistant mildew-proof soybean protein adhesive is prepared. The lauroyl arginine ethyl ester hydrochloride, the soybean meal and the sodium carboxymethyl cellulose respectively form high-specificity guanidyl carboxylate bridge hydrogen bonds, so that a heterogeneous structure is formed in a system, internal energy dissipation is improved, and the toughness and the water resistance of the adhesive are further improved. Meanwhile, due to the broad-spectrum antibacterial property of the ethyl lauroyl arginate hydrochloride, the adhesive has better corrosion-resistant and antibacterial effects.

The invention belongs to the technical field of supramolecular materials, and relates to a high-stretchability pillararene polypropylene hydrogel and a preparation method thereof. The preparation method comprises the following steps: mixing and reacting a pillararene compound, a 4, 4 '-bipyridine compound and polyethylene glycol to obtain a supramolecular polymer, adding the supramolecular polymer into an aqueous solution formed by blending acrylamide, sodium acrylate and N, N-methylene bisacrylamide, and adding metal ions, an initiator and an accelerant. The preparation method of the pillararene supramolecular polymer network provided by the invention is simple, mild in reaction condition and easy to implement; the polymer is added into the propenyl hydrogel, so that the mechanical property of the propenyl hydrogel can be greatly improved, more excellent mechanical property and energy dissipation are brought to the material, and the propenyl hydrogel has great potential in the aspect of preparing a toughening agent.

The present application relates to the field of bonding technology, and provides an adhesive tape and a preparation method and application thereof, wherein the adhesive tape comprises a flexible substrate having a woven structure and an adhesive layer bonded to at least one side surface of the flexible substrate. The adhesive tape provided by the present application is provided with an adhesive layer on the surface of the flexible substrate. Since the flexible substrate is provided with a woven structure, the woven structure can be displaced during the peeling process, thereby improving the energy dissipation of the peeling process, thereby enhancing the adhesion between the adhesive tape and the substrate.

The invention discloses a nested spiral damping device based on compression-torsion coupling, and relates to the technical field of dampers. According to the nested spiral damping device based on pressure-torsion coupling, the damping device comprises an upper end plate, multiple sets of fan blades are arranged on the outer end face of the upper end plate in an array mode, nested rods are arranged at the bottom of the upper end plate with the center of the upper end plate as a base point in an array mode, a nested pipe is arranged at the bottom of each nested rod, and each nested rod is nested in a nested groove of the corresponding nested pipe; the multiple sets of nesting rods and the nesting pipes are each of a spiral structure. The compression-torsion coupling effect is achieved in design, the nesting rod and the nesting pipe generate relative slippage through downward movement of the upper end plate, vibration energy is dissipated through the characteristics of a high-friction material, and compared with the prior art, the compression-torsion coupling effect is more remarkable through the spiral structure design of the nesting rod and the nesting pipe, the damping effect is enhanced, and the damping effect is improved. The high-strength material ensures the stability of the device under high-frequency vibration and impact.

The invention relates to a particle impact composite damper which is installed on a building structure and used for damping, and the damper comprises a damper cavity, a particle impact layer and a particle impact layer, the movable baffle is located in the damper cavity and divides the damper cavity into a first cavity body and a second cavity body. The particles are arranged in the first chamber; the impact dampers are arranged in the second cavity and move in the direction close to or away from the baffle, and each impact damper comprises an impact block and an impact shell which is arranged outside the impact block in a sleeving mode and used for colliding with the impact block; the magnet is arranged at one end of the impact block close to the baffle; the electromagnet is arranged on one side, facing the second cavity, of the baffle and attracts the magnet, and the magnetic pole of the electromagnet is opposite to that of the magnet when the electromagnet is electrified. Compared with the prior art, the particle damper combines the advantages of a traditional particle damper and an impact damper, has the advantages of being high in vibration reduction efficiency and wide in application range, and can meet the actual application requirements of mechanical engineering or civil engineering.