44results about How to "Restoration of mechanical properties" patented technology

The invention discloses a liquid-phase mineralizing precursor and a method of repairing demineralized dentine and belongs to the technical field of biomaterials. The liquid-phase mineralizing precursor can repair the demineralized dentine and is a calcium carbonate mineralizing precursor solution containing a polymer and magnesium ions, wherein the concentration of the polymer is 5-100 [mu]g / mL, concentration of Ca<2+> is 1-15 mM, and molar ratio of Mg<2+> to Ca<2+> is 1-6:1. A preparation method of the liquid-phase mineralizing precursor includes steps of: suspending CaCO3 powder in distilledwater and feeding CO2 gas for 1-4 h at room temperature; filtering away residual CaCO3 and feeding CO2 gas for 15-60 min at room temperature; measuring the concentration of Ca<2+> and adding distilled water to regulate the concentration of Ca<2+>; adding the polymer and MgCl2 powder and uniformly mixing the mixture. The liquid-phase mineralizing precursor employs easy-to-obtained raw material andhas simple system, and is a creative break for therapy on oversensitive dentine.

The invention relates to a method of quickly repairing demineralized dentine. An existing method of repairing demineralized dentine uses two dentine non-collagen analogs, repairing is implemented by the aid of a Portland cement slow-release system, but this method is too complex and takes as long as four months to achieve full mineralization. According to the method of the invention, polyacrylic acid simple and easy to obtain is used as a regulator, calcium ions and phosphorus ions are used as raw materials, and fluidic amorphous calcium phosphate particles 15-20 nm in size are synthesized; glutamic acid is then used as a mineralization accelerator to mineralize the demineralized dentine again within 2 days, the natural hierarchical structure of the demineralized dentine is repaired, and the mechanical properties of the re-mineralized dentine also close to those of natural dentin. Compared with existing re-mineralization techniques, the method has the advantages that on the basis of achieving equivalent repaired hierarchical structure and mechanical properties, an apparatus is simple, time consumption is low, and the problem of re-mineralizing the demineralized dentine is more effectively solved.

The invention discloses a preparation method of high-strength double-layer network hydrogel capable of being subjected to fatigue repair. The preparation method comprises the following steps: firstly preparing a mixed solution of a first layer of network polymers PVA (Polyvinyl Acetate) and a second layer of network monomers, generating hydrogen bonds between PVA molecular chains by adopting a freezing-melting method so as to form a first layer of physical cross-linked networks, and then polymerizing and crosslinking the second layer of network monomers by adopting an ultraviolet-irradiation method so as to form a covalent cross-linking network, thus obtaining the double-layer network hydrogel, the two layers of networks of which are crosslinked in different ways. The preparation method of the high-strength double-layer network hydrogel, disclosed by the invention, has the advantages that the component range of the two layers of networks of the double-layer network hydrogel is expanded; after the obtained hydrogel is subjected to low temperature circulation, physical crosslinking points are capable of being subjected to fatigue repair and meanwhile the double-layer network hydrogel has the characteristic of high strength.

The invention provides a polymer damping material capable of being repaired at room temperature and a preparation method and application thereof, and belongs to the technical field of polymer materials. The polymer damping material capable of being repaired at room temperature is prepared from the following preparation raw materials: polyhydric alcohol, isocyanate, a chain extension cross-linkingagent and a solvent. The polyhydric alcohol comprises amino-terminated polyhydric alcohol or hydroxyl-terminated polyhydric alcohol, a molar ratio of the polyhydric alcohol to the isocyanate is (1.1-1.3): 1, and the crosslinking degree of the polymer damping material capable of being repaired at room temperature is 5-30%. The polymer damping material capable of being repaired at room temperature is high in transparency and excellent in mechanical property, spontaneous wound repair can be carried out at the room temperature after mechanical damage, the safety and durability of the material aregreatly improved, the service life of the material is greatly prolonged, and a good damping effect is achieved at the room temperature. Meanwhile, the damping material can be reshaped and recycled when being seriously damaged.

A method of manufacturing a rotating body of a torque converter capable of reducing cost for manufacturing the rotating body of the torque converter. The rotating body comprises the turbine shell of the torque converter, a plurality of turbine blades fixed to the inner surface of the turbine shell, and the driven plate of a lockup device fixed to the rear face of the turbine shell. The manufacturing method for the rotating body comprises a first step, a second step, and a third step. In the first step, the driven plate is fixed to the turbine shell. In the second step, the turbine shell and the plurality of turbine blades are heated and the plurality of turbine blades are fixedly brazed to the turbine shell. In the third step, for hardening, the rotating body is rapidly cooled after heat treatment in the second step.

The invention discloses a polysiloxane based on an aromatic disulfide bond, which is composed of an amino-terminated polysiloxane and a substituted or unsubstituted 4,4'-diaminodiphenyl disulfide reacted with a crosslinking agent Formation of amide bonds, polycondensation. The polysiloxane of the present invention not only has good flexibility, but also has a large number of reversible dynamic bonds, abundant hydrogen bonds and disulfide bonds, and can spontaneously repair damage at room temperature or under heating conditions, and is more capable of The repair material adapts to the physical environment of the positive electrode material of the lithium battery, has good bonding performance and stability, and can alleviate the specific capacitance attenuation caused by the expansion of the battery during charging and discharging, thereby repairing the micro-cracks of the battery, increasing the cycle times of the battery, and prolonging the life of the battery. The service life of the battery can be used as a self-healing binder to prepare positive electrode materials in lithium batteries.

The invention discloses a preparation method of a hydrogel electrode with high mechanical properties and self-healing property, belonging to the technical field of biomaterials. In the present invention, polydopamine-modified conductive nanomaterials are firstly prepared in a solution, and then water-soluble monomers are added to the solution, and then an initiator, a cross-linking agent and an auxiliary agent are added to mix evenly, and the hydrogel is formed by free radical polymerization. electrode. The hydrogel electrode prepared by the invention does not have good electrical conductivity and mechanical properties; and due to the non-covalent bond between polydopamine chains, the hydrogel electrode has good self-healing performance. The hydrogel electrode prepared by the invention has the ability to heal spontaneously in a short period of time after accidental damage; combined with its good biocompatibility, the self-healing hydrogel electrode prepared by the invention It is expected to be applied to modern clinical detection and biomedical measurement.

The invention discloses an asynchronous cold rolling forming process of an aluminum alloy stainless steel clad plate, which comprises the following process steps: adopting an asynchronous rolling method to roll and clad the stainless steel plate and the aluminum alloy plate; after the asynchronous rolling, diffusion annealing the clad plate; In the S1 step, the opposite surface of the composite plate surface of the stainless steel plate is heated online, and the opposite surface of the composite plate surface of the aluminum alloy plate is cooled online, and the heating temperature is 350 ° C to 850 ° C; The temperature of the clad plate surface of the stainless steel plate of the clad plate is lower than 650°C, and the temperature of the clad plate surface of the aluminum alloy plate rolled out of the clad plate is lower than 300°C; the rolling reduction rate is 20% to 90%; the roll of the asynchronous cold rolling The speed ratio is 1.05-1.50; the thickness ratio of the aluminum alloy plate and the stainless steel plate is 1.5-4.0; in the S2 step, the annealing temperature is 250°C-500°C, and the annealing time is 15-120min. The invention creatively proposes a one-side online heating process for rolling a composite plate to improve the bond strength of the interface of the composite plate and realize rolling and compounding in a semi-molten state of the interface.

The invention relates to an injectable vertebra repairing device for treating a spinal vertebral fracture.The injectable vertebra repairing device comprises an injectable chain and a filling tool; the injectable chain is in the shape of a cylinder with the rough surface, a central through hole is formed in the injectable chain, multiple grooves are formed in the upper portion and the lower portion of the chain, and the grooves are communicated with the central through hole; the filling tool comprises a filling casing pipe and a push rod casing pipe, and the tail end of the filling casing pipe and the tail end of the push rod casing pipe are provided with grab handles respectively; the front end of the push rod casing pipe and the near end of the injectable chain are designed to be of a tapper thread structure.When the device is operated, the top end of the filling casing pipe stretches into the lesion part, and the chain is filled into the damaged vertebra through the push rod casing pipe; bone cement is injected into the central through hole of the chain through the push rod casing pipe; the central through hole and the grooves are sequentially fully filled with the bone cement, solidification is performed to complete repairing, pressure exerting on the lesion part can be uniform and be reduced, and therefore the effect of effectively repairing the vertebra is achieved.The injectable vertebra repairing device is applied to the field of medical instruments and mainly used for achieving the purposes of stabilizing the fracture, recovering the vertebral mechanical strength and relieving pain.