40results about How to "Good physical barrier" patented technology

The invention relates to a carbon nitride composite material and a preparation method and an application thereof. The carbon nitride composite material comprises a substrate and a composite coating layer for covering the surface of the substrate; the composite coating layer comprises carbon nitride, a conductive agent and a binder; the conductive agent is selected from at least one kind of active carbon, acetylene black, Ketjen black, graphite, graphene and carbon nanotubes. The carbon nitride composite material can be applied to a diaphragm of a lithium-sulfur battery; when a polysulfide exists, the conductive agent can transfer electrons generated in the charge-discharge process, so that an effect of a second current collector as well as an effect of physical isolation can be played; in addition, carbon nitride has relatively high physical isolation effect and large specific surface area; and due to existence of the nitrogen element, shuttling of the polysulfide can be suppressed by the dual chemical and physical absorption effects effectively, thereby enabling the lithium-sulfur battery to be relatively high in discharge specific capacity and cycling stability.

The invention relates to a composite film for guiding bone tissue regeneration and a preparation method of the composite film. The composite film is a double-layer film, wherein a bottom-layer film is an L-lactide and caprolactone copolymer (L-PLCA) cast film with a compact structure, and the molar ratio of monomer components is (50:50) to (95:05); a surface layer is an L-PLCA and hydroxyapatite (HA) or tricalcium phosphate (beta-TCP) compound electrospinning film with a micropore structure, wherein the mass ratio of HA or beta-TCP in the electrospinning film is 10-50wt%, and the particle size of the electrospinning film can be nano-grade or micro-grade. The double-layer composite film is relatively good in mechanical performance and bone-like apatite deposition induction capacity, favorable in flexibility and capable of realizing performance regulation through regulating the molar ratio of L-PLCA, the content of the component HA or beta-TCP and the microstructure of the electrospinning film so as to be a novel degradable double-layer composite film capable of guiding bone tissue regeneration.

The invention belongs to the technical field of medicine and hygiene, and in particular relates to a temperature-sensitive medical chitosan derivative preparation and a preparation method of the temperature-sensitive medical chitosan derivative preparation. The main ingredient, namely, chitosan derivative in the preparation is hydroxybutyl chitosan. The product has the temperature sensitivity, and has good effects of bleeding stopping, adhesion preventing, drug sustained release, and prevention and treatment for osteoarthritis. The preparation method of the temperature-sensitive medical chitosan derivative preparation has the advantages that large-scale production can be realized, high-pressure steam sterilization or filtration sterilization can be realized, and viruses, immunogenicity and the like can be removed.

The invention discloses a nano silicon dioxide/polymer material guided bone regeneration composite porous membrane and a preparation method thereof. The thickness of the membrane is 0.1-0.3 mm, the mass ratio of nano-silicon dioxide to a polymer material is 1:(2-4), and the polymer material is one or two of a poly(N-isopropyl acrylamide)-polycaprolactone-polyethylene glycol copolymer, polycaprolactone, polylactic acid, polyglycollide and collagen. The nano silicon dioxide/polymer material guided bone regeneration composite porous membrane is high in mechanical strength, good in biocompatibility, moderate in degradation speed and capable of achieving a good physical barrier effect, quickly growing fibroblasts are prevented from migrating to a wound part, a regeneration space is provided forslowly growing bone tissue, and the guided bone regeneration composite porous membrane has wide application prospects.

The invention relates to a biodegradable and bioabsorbable superfine composite fiber film, which consists of poly lactic-co-glycolic acid of the weight ratio ranging from 75wt% to 100wt% and poly latic acid-b-polyethylene glycol of the weight ratio ranging from 0wt% to 25wt%. The preparation method includes the following steps of mixing the poly lactic-co-glycolic acid and the poly latic acid-b-polyethylene glycol into N, N-dimethylformamide or acetone or mixture of the N-dimethylformamide and the acetone so as to obtain uniform polymer solution, then stirring the uniform polymer solution at room temperature to obtain uniform mixed liquid, and finally injecting the uniform mixed liquid into an electrostatic spinning device to conduct electrostatic spinning, and accordingly the poly lactic-co-glycolic acid and the poly lactic acid-b-polyethylene glycol superfine composite fiber film is obtained. The superfine composite fiber film has excellent biocompatibility and adjustable biodegradation, has the advantages of light and soft texture and fine permeability simultaneously, and can be used as excellent internal adhesion-proof materials.

The invention discloses a nanosheet composite coating, and belongs to the field of coatings. In the raw material components of the product, urushiol is used as a modifier to anchor and synergistically strip two-dimensional nanosheets, so that the two-dimensional nanosheets are effectively dispersed, the modified nanosheets can play a good physical barrier role when the coating is used, and the path of a corrosive medium entering the coating is greatly prolonged; in addition, an alkyl chain structure contained in urushiol can also provide a hydrophobic surface for a nanosheet composite coating product, so that water molecules are difficult to permeate easily; and catechol groups contained in urushiol can effectively passivate the protected metal and alloy, so that a compact oxidation film is formed on the surface of the metal and alloy, and the metal substrate is effectively protected. The invention further discloses a preparation method and application of the nanosheet composite coating.

The invention discloses a method suitable for ecological restoration of a concrete spraying side slope. A construction structure comprises a concrete spraying layer, an isolation layer, a galvanized metal net, a nutrition matrix layer, an ecological water and soil protection blanket and a spraying medium layer, wherein the isolation layer is a material layer which neutralizes alkali released by the concrete spraying layer and isolates the alkalinity from diffusing, the isolation layer is tightly attached to the concrete spraying layer, the galvanized metal net is laid and hung on the surface of the isolation layer and is fixed through anchor rods, the nutrition matrix layer is arranged on the galvanized metal net, the ecological water and soil protection blanket is laid on the nutrition matrix layer and is fixed through U-shaped anchor nails, the spraying medium layer is arranged on the ecological water and soil protection blanket, and nursery stocks are planted. According to the method, the construction problems of vegetation planting and ecological restoration of the concrete spraying side slope in an existing soil dressing spray-seeding technique are solved, and the influence of alkali release of the concrete spraying layer on plant growth can be effectively inhibited.

The invention discloses an environmental protection type single-layer PET (Polyethylene Terephthalate) colored film-covered steel plate, which comprises a steel plate base material, wherein chemical coatings and graphene-water soluble organic silicon modified acrylic resin primer layers are stacked in sequence on both the front surface and the back surface of the steel plate base material; a PET film is pasted on the graphene-water soluble organic silicon modified acrylic resin primer layer of the front surface; afterwards, a PE (Polyethylene) protecting film is pasted on the PET film. A preparation process of the environment protection type single-layer PET colored film-covered steel plate comprises uncoiling, sewing, washing, oven-drying, chemical coating, the oven-drying, primer coating, oven-drying solidification, PET film covering, cooling and PE protecting film covering. According to the film-covered steel plate provided by the invention, PVC (Polyvinyl Chloride) layers are replaced by adopting graphene-water soluble organic silicon modified acrylic resin primer; the film-covered steel plate has decorative attractiveness, favorable corrosion resistance and physical and mechanical performance at the same time, and accords with the development direction of an environment-friendly material.

The invention discloses a waterborne epoxy resin anticorrosion coating and a preparation method thereof. The method comprises the following steps: preparing a bismuth vanadate and graphene oxide heterojunction composite material through a high-pressure hydrothermal reaction, and compounding the bismuth vanadate and graphene oxide heterojunction composite material with a waterborne epoxy resin to prepare the waterborne epoxy resin anticorrosion coating. The surface of metal is coated with the coating, the bismuth vanadate and graphene oxide heterojunction composite material in a coating layer generates electrons when encountering light, and the electrons are transmitted to the surface of the metal and are enriched to reduce the self-corrosion potential of the metal, so the photoinduced cathodic protection effect is achieved. A graphene oxide nanosheet layer has a reinforcing and toughening effect on the coating layer formed by compounding the waterborne epoxy resin, and the graphene oxide nanosheet layer and the formed compact coating layer can physically block various corrosion effects. The waterborne epoxy resin anticorrosion prepared in the invention has the advantages of environmental friendliness, good film adhesion, and good corrosion and aging resistance, and can be used for metal protective coating of bridges, ship shells, transmission towers, underground oil and gas pipelines and the like.

The invention belongs to the technical field of coatings and particularly discloses a quick-drying environment-friendly coating for surface treatment of mechanical equipment and a preparation method thereof. The coating is prepared from 20 to 35 parts of phenolic resin, 18 to 30 parts of furan resin, 15 to 30 parts of acrylic resin, 5 to 8 parts of a quick-drying silicon solution, 2 to 5 parts ofgraphene, 3 to 5 parts of a pigment, 1 to 1.5 parts of a binder, 1 to 1.5 parts of a defoaming agent, 2 to 3.5 parts of a coalescing agent and 0.5 to 1 part of a thickening agent. The phenolic resin,the furan resin and the acrylic resin are added, so that the coating has the characteristics of high strength, tear resistance, impact resistance, wear resistance and the like; the quick-drying silicon solution is added, so that the coating can be quickly dried and solidified; the graphene is added, so that a good physical barrier effect is achieved, and the corrosion resistance of the coating isenhanced; the prepared coating product has good corrosion resistance and impact resistance and is environmentally friendly, the drying speed of the coating is high, and the preparation method is simple and easy to implement.

The invention belongs to the technical field of pharmaceutical preparations, and particularly relates to a fat emulsion, a compound amino acid and a glucose injection and a preparation method thereof.Three chambers separated by diaphragms are respectively used for containing a fat emulsion injection, a compound amino acid injection and a glucose injection; when in use, three injections can be uniformly mixed and intravenously injected to a human body only by sequentially and forcibly extruding each chamber or tearing the isolation strips between the chambers, and the mixing operation can be carried out under any environmental conditions, so that serious adverse reactions such as transfusion heat source reaction, blood infection and septicemia caused by microbial contamination in the traditional mixing operation are greatly reduced. The total volume of the injection is small, the injection is suitable for providing full parenteral nutrition for patients with extremely low weight and providing supplementary parenteral nutrition for patients with general weight, the formula of the compound amino acid injection is optimized, and the ratio of various amino acids is more reasonable.

The invention relates to the technical field of rubber materials, in particular to an anti-corrosion wear-resistant rubber material and a preparation method thereof. The rubber material is prepared from, by weight, 20-30 parts of chloroprene rubber, 50-60 parts of butadiene rubber, 15-20 parts of ammonium polyphosphate, 35-50 parts of phenolic resin, 7-15 parts of white carbon black, 1-5 parts ofsilane coupling agents, 8-16 parts of bamboo fibers, 1-2 parts of polypropylene fiber, 2-5 parts of magnesium oxide powder, 1-4 parts of zinc oxide powder, 3-8 parts of stearic acid, 1-6 parts of naphthenic oil, 1-4 parts of anti-aging agents, 2-7 parts of accelerants, 2-6 parts of vulcanizing agents, 1-5 parts of diphenyl silanediol and 2-8 parts of A-stage phenolic resin. Raw materials for preparing the rubber material are matched with each other, excellent anti-corrosion and wear-resistant functions are achieved, durability of the rubber material is enhanced, and the service life of the rubber material is prolonged.

The invention relates to the technical field of biomedical materials, and particularly discloses anti-adhesion gel for a postoperative uterine cavity as well as a preparation method and application ofthe anti-adhesion gel. The anti-adhesion gel for the postoperative uterine cavity is prepared from the following components in percentage by weight of 0.1-1.0 percent of gellan gum, 0.2-2 percent offunctional auxiliary materials, 2-6 percent of osmotic pressure regulator and the balance of water for injection. The anti-adhesion gel for the postoperative uterine cavity is ionic phase-change gellan gum, and when the anti-adhesion gel is injected into the uterine cavity of a body, the viscosity is relatively low, the fluidity and the adhesiveness are good, and coating is uniform and rapid. After contact with uterine cavity liquid and ion phase change occurs, curing time is short, relatively high strength, elasticity and toughness are achieved, in-vivo adhesion can be maintained for 14 daysor longer, a good anti-adhesion effect is achieved in the recovery period, and the gel is gradually and safely degraded after 14 days and is absorbed or discharged by the human body.

The invention provides edible oil containing hericium erinaceus and a preparation method of the edible oil containing hericium erinaceus. The edible oil is scientifically compounded from vegetable oiland animal oil, is good in compatibility, free from layering or separation, meets requirements of nutritive meals, and is free from voluntary collocation of consumers, and the cooking convenience isgreatly improved. Dried hericium erinaceus is also added to the edible oil in the manner of microemulsion, so that uniform dispersion of hericium erinaceus components in the edible oil can be promoted, excellent health-care effects are introduced, bitter taste can be effectively removed, and the flavor and the mouth feel of the edible oil are not influenced.

The invention discloses a nanometer material-loaded aramid fiber coated battery diaphragm. The nanometer material-loaded aramid fiber coated battery diaphragm comprises a polyolefin porous diaphragm and an aramid fiber coating which coats one side of the polyolefin porous diaphragm, and the nanometer material is loaded on the aramid fiber nanofiber of the aramid fiber coating. The invention also discloses a preparation method of the diaphragm and a lithium-sulfur battery with the diaphragm. The coated aramid fiber coating has good thermal stability and electrolyte affinity, and the loaded nano material can inhibit shuttling of high-grade lithium polysulfide chains and promote mutual conversion of the high-grade lithium polysulfide chains; and the preparation method adopted in the invention can ensure uniform distribution of the nano-material and increase the specific surface area of the nano-material. When the diaphragm is assembled in the lithium-sulfur battery, the specific capacity and the cycling stability of the lithium-sulfur battery can be improved.