46results about How to "Controllable mechanical strength" patented technology

The invention relates to a chitosan modified alginate hydrogel three-dimensional porous bracket with specific in-vitro degradability and a preparation method thereof. The method comprises the following steps: dissolving sodium alga acid serving as a raw material in phosphate buffer solution; performing amidation reaction of a carboxyl group in the sodium alga acid and an amino group in a cross-linking agent cystamine or dimethyl cystinate under the activation of water-soluble carbodiimide to form a chemically crosslinked hydrogel; performing freeze drying on the hydrogel to obtain a porous bracket material of the hydrogel; and performing surface modification on the porous bracket by using chitosan. In solution of a reducing agent such as cysteine with an appropriate concentration, a disulfide bond in a hydrogel cross-bridge is degraded through a disulfide bond-sulfydryl conversion reaction, so the porous bracket is decomposed and dissolved and disappears. Therefore, the porous bracket can be used as an in-vitro cell culture template material. The hydrogel porous bracket researched by the invention has the characteristics of simple preparation, rich raw material source, low cost and availability. Various physiochemical performances, mechanical strength, degradation rate and surface properties of the bracket material are controllable within a large range.

The invention relates to a Fe-based austenite alloy oil sleeve, which comprises the following components in percentage by mass: less than or equal to 0.03 percent of C, less than or equal to 0.03 percent of P, less than or equal to 0.03 percent of S, 0.01 to 1.0 percent of Si, 0.01 to 3.0 percent of Mn, 25 to 40 percent of Ni, 20 to 35 percent of Cr, 1 to 5 percent of Mo, 0.1 to 1.5 percent of Cu, 0.01 to 0.5 percent of Al, less than or equal to 0.01 percent of O, and the balance of Fe and inevitable impurities. The 90 to 140 ksi steel-grade Fe-based alloy oil sleeve meeting different well depth requirements of high-acidity oil fields and gas fields is manufactured by thermal extrusion, 1,050-1,180 DEG C of solution treatment and cold rolling of the smelted and forged blanks.

The invention belongs to the technical field of biological materials, and discloses a hydrogel material for 3D bioprinting and a preparation method and application of the hydrogel material. The hydrogel material comprises the following components in percentages by mass: 0.5-10% of gellan gum and/or derivatives, 0.1-20% of PEG and/or derivatives thereof, 0-1% of a crosslinking initiator, 0-15% of biologically active components and the balance of a solvent. The hydrogel material is double-network hydrogel based on the gellan gum and PEG; interpenetrating double-network structures are formed in a physiological environment; and the hydrogel material has good structure and dimensional stability, and has the advantages of quick gum formation under physiological conditions, excellent cell compatibility, small immunological rejection, high cell encapsulation efficiency, controllable mechanical strength, biodegradability and the like. The hydrogel material is applied to 3D bioprinting; the shortcomings of low curing speed, harsh curing conditions, limited mechanical properties, poor cell compatibility and the like are overcome; and the hydrogel material has obvious advantages and good industrialized prospect.

The invention relates to a gel electrolyte membrane, a lithium ion battery, and preparation methods therefor. The preparation method for the gel electrolyte membrane comprises the steps of providing a battery electrode plate; preparing gel electrolyte precursors of different viscosities; and forming the gel electrolyte membranes on at least one surface of the electrode plate by the gel electrolyte precursors of different viscosities, testing the mechanical strengths of the gel electrolyte membranes prepared from the gel electrolyte precursors of different viscosities, making a corresponding viscosity-mechanical strength standard curve, and obtaining a target gel electrolyte membrane prepared by selecting the gel electrolyte precursors of different viscosities according to the standard curve corresponding to the predetermined mechanical strength of the target gel electrolyte membrane. The invention also relates to the gel electrolyte membrane prepared by the method, and also relates to a preparation method for the lithium ion battery which is prepared from a gel electrolyte membrane cell after the gel electrolyte membrane cell is obtained by adopting the gel electrolyte membrane, and the lithium ion battery prepared by the lithium ion battery preparation method.

The invention discloses a biomimetic hydroxylapatite powder/gelatin/sodium alginate composite 3D print bracket and a preparation method thereof. The preparation method of the biomimetic 3D bracket comprises the steps of (1) preparing hydroxylapatite powder having a biomimetic classified structure; (2) preparing hydroxylapatite powder/gelatin/sodium alginate composite pulp; and (3) preparing the biomimetic 3D print bracket. According to the biomimetic hydroxylapatite powder/gelatin/sodium alginate composite 3D print bracket and the preparation method thereof disclosed by the invention, a 3D printing technique is utilized, the prepared organic/inorganic composite three-dimensional print bracket is controllable in outside size and good in biocompatibility, components and a multi-level structure of natural bone tissue are sufficiently simulated, and controlled mechanical strength is given to materials; and the micro-nano multi-level structure of the composite bracket has higher osteogenesis activity and osteoinductive, a multi-level pore structure can effectively induce ingrowth of tissue and blood vessels, and regeneration and repair of the bone tissue are promoted.

The invention relates to the technical field of printing and dyeing wastewater treatment. The invention discloses a preparation method and application of temperature-sensitive composite hydrogel by utilizing a synergistic effect of photocatalysis and temperature sensitivity. The temperature-sensitive composite hydrogel disclosed by the invention is prepared by the steps: introducing a temperature-sensitive copolymer and a photocatalyst into alginate hydrogel; the porosity of the hydrogel is adjustable in the temperature change process, a dye can be adsorbed and degraded under the illuminationcondition, and the adsorption capacity of the composite hydrogel to the dye is improved by virtue of the synergistic effect of a porous structure in the hydrogel caused by adding a catalyst and a loose structure formed by a temperature-sensitive copolymer at the temperature higher than the conversion temperature. And by virtue of the photocatalyst embedded in the hydrogel, the degradation of the adsorbed dye and the cyclic utilization of the composite hydrogel can be realized, and the composite hydrogel can be applied to the fields of printing and dyeing sewage treatment and the like.

The invention provides degradable silica-based hybrid polymer biomedical elastomer and a preparation method thereof. The degradable silica-based hybrid polymer biomedical elastomer (PCD-POSS) is obtained by preparing PCD prepolymer from citric acid, diol or polyhydric alcohol through thermal polymerization, preparing PCD-g-POSS prepolymer from acid, diol or polyhydric alcohol and POSS through thermal polymerization, dissolving the two types of prepolymer in organic solvent, and adding a cross-linking agent HDI and a catalyst for the cross-linking reaction. The thermal polymerization method used for the method is environmentally friendly, convenient to operate and low in raw material cost. The prepared PCD-POSS has biomimetic viscoelasticity, high chemical strength, good mechanical performance, high biological activity and biological stability, adherency and proliferation of osteoblast and soft tissue cells can be remarkably promoted, and the silica-based hybrid polymer biomedical elastomer has good application prospects in the fields of bone tissue and soft tissue regeneration and medicine transportation.

The invention discloses a preparation method and a sealing process of an explosion-proof primary lithium battery cover group and sealing glass. A glass material which is resistant to electrolyte corrosion, excellent in electrochemical performance, controllable in mechanical strength and used for sealing the primary lithium battery cover group is provided, and the compressive strength of the glass is controlled by designing glass components and the sealing thickness. The explosion-proof principle is that when the internal pressure of the battery is greater than the designed pressure in the use process, namely the pressure of the battery is overloaded, the pressure-bearing strength of the glass material is just reached, so that the glass is cracked, the internal pressure of the battery is slowly released, and the battery does not have dangerous situations such as violent explosion. The shell is made of stainless steel series and carbon steel series, the stainless steel series comprises 304L, 316L and the like, and the core column is made of series iron-nickel alloys such as alloys 4J28, 4J50, 4J52 and the like. A SiO2-B2O3-BaO-Na2O3 glass system is selected as a main body, and various metal oxides are added to adjust the thermal expansion coefficient, the glass softening temperature, the chemical stability and the mechanical properties of the glass.

The invention discloses a support material with conductivity and an antioxygenic property and a preparation method thereof. The support material is prepared from phenylamine pentamer modified by glutathione, and gelatin. The support material has favorable mechanical strength and adjustable degradation characteristic. More importantly, the support material has good conductivity, and can effectively scavenge various oxygen radicals such as hydroxyl radicals, organic oxygen radicals and superoxide radicals. According to the support material with the conductivity and the antioxygenic property and the preparation method thereof provided by the invention, the dual-network conductive support material is prepared by adopting one-step shaping, so that the preparation method is simple, components are uniform and controllable. More importantly, the support material has favorable biocompatibility and can support the adhesion and the growth of various cells. Stem cells can be promoted to differentiate into cardiac muscle cells, so that the support material has potential application prospect in cardiac muscle tissue engineering.

The invention discloses a modified bentonite-based hydrogel precursor solution for protecting silicate cultural relics and a preparation method and a use method thereof. The preparation method comprises the following steps: preparing the modified bentonite-based hydrogel precursor solution and a deionized water diluted solution of tetramethylethylenediamine; uniformly mixing the modified bentonite-based hydrogel precursor solution with a deionized water diluted solution of tetramethylethylenediamine, and coating a to-be-repaired part of the silicate cultural relic with a mixed solution of the modified bentonite-based hydrogel precursor solution and the deionized water diluted solution of tetramethylethylenediamine; and attaching a repairing part of the silicate cultural relic to the to-be-repaired part of the silicate cultural relic so that a mixed solution of the modified bentonite-based hydrogel precursor solution and the deionized water diluted solution of tetramethylethylenediamine naturally forms the modified bentonite-based hydrogel, and bonding repairing of the silicate cultural relic is achieved.

The invention discloses a degradable ureteral stent and a manufacturing method thereof, belongs to the technical field of medical catheters, and aims to solve the problem in the prior art that an existing ureteral stent cannot be absorbed by a human body and needs to be taken out in an operation. According to the technical scheme, the degradable ureteral stent comprises an outer membrane layer, awoven layer and an inner membrane layer which are made of degradable materials, and the woven layer is formed by weaving two different degradable materials. The degradable ureteral stent is composed of the inner membrane layer, the woven layer and the outer membrane layer which are made of different degradable materials, and by means of the difference of the thermal performance and the degradationspeed of the multi-component degradable materials, the overall mechanical performance of the degradable ureteral stent is improved, and the degradation speed is further increased.

The invention discloses a medical degradable multilayer polymer/graphene film material and a preparation method thereof. The method includes firstly attaching a biodegradable polymer to a single-layergraphene/Cu substrate by spin coating or casting; then removing Cu through etching to obtain polymer/single-layer graphene film; and laminating a plurality of layers of the polymer/single-layer graphene film to obtain the multilayer polymer/graphene film. The polymer is good in biocompatibility with graphene and is degradable in vivo, and the degradation time of the disclosed film material can beadjusted and controlled through controlling the number of layers of the polymer/graphene film. In addition, the multilayer polymer/graphene film has high mechanical strength, and is corrosion resistant and antibacterial. The preparation method is simple. The multilayer polymer/graphene film material is expected to be applied in clinical surgical suture supporting materials and surface modification of implants.

The invention provides a preparation method of chitosan oligosaccharide mouth cleaning buccal tablets. Each chitosan oligosaccharide mouth cleaning buccal tablet is prepared from the following components in percentage by weight: 5-10% of chitosan oligosaccharide, 70-85% of alginate and 10-20% of moringa oleifera powder; and the method comprises the following steps: (1) uniformly mixing the chitosan oligosaccharide, alginate and moringa oleifera powder; (2) adding pure water into the mixture obtained in the step (1), wherein, the weight ratio of the water to the mixture is (1:20)-(1:50); and stirring for 20-40min at 20-60 DEG C; (3) putting the uniform slurry of chitosan oligosaccharide, alginate and moringa oleifera powder obtained in the step (2) into a freeze-drying disk while controlling the thickness of the uniform slurry layer at 3-30mm; and evening the surface in a mechanical way; (4) putting the freeze-drying disk with the uniform slurry of chitosan oligosaccharide, alginate and moringa oleifera powder in the step (3) into a freeze drier, pre-freezing for 20-50min at (-20)-(-40) DEG C, vacuumizing and performing freeze drying until the water content of the freeze-dried membrane is 4-8% by weight; and (5) preparing the tablets containing chitosan oligosaccharide, alginate and moringa oleifera powder, prepared in the step (4), into buccal tablets by using a die cutting method.

The invention discloses a preparation method for sodium alginate nanometer fiber-based hydrogel. Additional electrolyte and alcohol are utilized to capture water in a sodium alginate nanometer fiber solution system, so that nanometer fibers get close and gather to intertwine and construct hydrogel in a semitransparent state with a three-dimensional network structure. Under the effect of shearing force, the three-dimensional network structure is easily damaged. After the external force is removed, the network structure can spontaneously reconstruct and the shearing-recovering performance is excellent. Carboxyl and hydroxyl on sodium alginate molecular chain are combined with red blood cells and the red blood cells can be covered in a network in the spontaneous reconstruction process of the extruded three-dimensional network structure, so that the hydrogel can be used for hemostasis without other drug component, the hemostasis speed is higher and the effect is better. Meanwhile, the energy storage modulus is high, the thixotropy is excellent and the method is suitable for 3D printing quick forming of biological material product.

The invention belongs to the technical field of fertilizer preparation and discloses a preparation method of a konjac flying powder-coated fertilizer. The method is characterized by comprising the following steps: (1) selecting raw materials according to the ratio of konjac flying powder to polyvinyl alcohol to water to glycerinum of (3-12)g:15g:300g:9g; (2) pouring the selected polyvinyl alcohol, water and glycerinum into a kneading machine; (3) adding the konjac flying powder to obtain a mixture; (4) extruding the mixture obtained in the step (3) through a screw of the kneading machine, containing the mixture in a polyethylene tray, immediately carrying out curtain coating until the solution is uniformly paved on the tray; (5) carrying out forced air drying on the tray containing the mixture obtained in the step (4) at 50-80 DEG C for 2-3h and forming a film from the mixture in the tray; (6) removing a film to obtain the film which is 0.12-0.2mm in thickness; (7) carrying out film cutting and sealing to prepare a coated fertilizer bag; and (8) carrying out fertilizer filling and sealing to obtain the required konjac flying powder-coated fertilizer. According to the method, the problem of shortage of a deep process technology of the konjac flying powder can be solved, and a factory technology is provided for production of the konjac flying powder-coated fertilizer.