149results about How to "Reduce the rate of degradation" patented technology

The invention relates to a fast preparation method of silk fibroin-hyaluronic acid complex gel. The fast preparation method comprises the following steps: dissolving silk fibroin obtained by degumming, preparing a regenerated silk fibroin solution through dialysis, mixing the regenerated silk fibroin solution with hyaluronic acid, and finally preparing the fast complex gel under the action of a crosslinking agent. Compared with a conventional hyaluronic acid gel formed by pure crosslinking, the complex gel can be fast formed and has the advantages that by adding the silk fibroin, the gelating time is effectively shortened, the degrading speed of the gel is reduced, the stay time for tissue repairing and filling is prolonged, and the operability is improved; compared with pure silk fibroin hydrogel, the complex gel has the advantage that by adding the hyaluronic acid, the shortcomings of low toughness, fragility and the like of the silk fibroin hydrogel are overcome. The method for preparing the complex gel is simple in process and short in gelating time; a novel method is provided for the preparation of functional complex gel; the prepared complex gel can be used in the field of medicinal health, tissue engineering, environment protection and the like.

The city sewage treatment process includes the following steps: utilizing grile and desilting basin to pretreat sewage, adding coagulating agent to make the phosphorus, heavy metal and orgnaic matters existed as colloid and suspended substances feed into anaerobic reactor in the form of sludge to make organic matter convert into impure methane, making the supernatant fluid pass through the next aerobic treatment reactor to remove organic matter and convert the ammoniacal nitrogen into nitric nitrogen, mixing anaerobic discharged water and aerobic discharged water, and making the mixture waterundergo the process of anaerobic treatment to make denitrifcation, finally utilizing secondary aeration and precipitation to completely remove organic matters from sewage so as to attain the goal of cleaning the sewage.

The present invention discloses a titanium aluminum alloy surface high temperature oxidation and hot corrosion resistant Al-Cr coating; an Al-rich deposition layer, an Al-Cr alloy layer and a Cr diffusion layer are successively arranged from surface to a titanium aluminum alloy substrate. The content of Al in the Al-rich deposition layer remains the same. The content of Al in the Al-Cr alloy layer gradually reduces outside-to-inside to 70%-100% of the content of Al in the titanium aluminum alloy substrate, and the rest in the Al-Cr alloy layer is Cr. The contents of Cr and Al in the Cr diffusion layer respectively gradually reduces outside-to-inside to same as the contents of Cr and Al in the titanium aluminum alloy substrate, and the rest in the Cr diffusion layer is other elements in the titanium aluminum alloy substrate, and the contents of other elements in the Cr diffusion layer respectively gradually rise to same as the contents of the other elements in the titanium aluminum alloy substrate from zero. The invention also discloses a preparation method of the titanium aluminum alloy surface high temperature oxidation and hot corrosion resistant Al-Cr coating; the titanium aluminum alloy surface high temperature oxidation and hot corrosion resistant Al-Cr coating can give titanium aluminum alloy excellent oxidation resistance and heat resistance corrosion performance under high temperature and long term service conditions, and due to the presence of the diffusion layer of the gradient components, the reliable binding strength and excellent thermal shock resistance can be realized.

The invention provides a preparation method of a DA-based gradient functional material. DA serves as a functional group, and the chemical reactivity, oxidation auto-polymerization and adhesion of DA are utilized to prepare the functional material with a multistage pore channel and a gradient structure. The method includes the steps that firstly, Alg is subjected to graft modification with DA to prepare biologically-modified macromolecular Alg-DA with excellent adhesion performance; then, DA is subjected to oxidation auto-polymerization assembly in a slightly alkaline buffer solution to form PDA particles of a uniform particle size; then, Alg-DA of different concentrations and the PDA particles act on each other to form a first-stage cross-linked structure, and then the gradient functional material is prepared with a lamination freeze-drying method; then, the gradient functional material is cross-linked again with calcium ions, and the cross-linking degree and porosity of the material are further adjusted. The DA-based gradient functional material provides a new way for preparing composites with an ideal texture. The gradient functional material prepared through the method has high mechanical performance and excellent biocompatibility and biodegradability, can effectively improve the absorption separation performance and the regeneration performance of soft/hard tissue and has broad application prospects in the fields of multifunctional separation and absorption films and biomedicine.

The invention discloses a method for preparing a modified aliphatic ester plasticizer. Aliphatic methyl ester (or ethyl ester) is subjected to epoxidation reaction and then subjected to chlorine addition and chlorine substitution reaction, the tail gas is treated by adopting a secondary tail gas absorption device, and a calcium chloride byproduct (a water treatment agent) is manufactured. The method has the advantages that: the process is clean; and the modified aliphatic ester plasticizer has the properties of epoxy groups and chlorine ions, and has the properties of light resistance, heat resistance, stability and flame resistance as a plasticizer product. The product of the invention can be widely applied to polyvinyl chloride (PVC) tubes, profiles, PVC films and artificial leather polyurethane (PU) products with flame-resistant requirements, and plays a good role in resisting flame and plasticizing.

The invention relates to a cable jacket material for a nuclear power station of the third generation and a preparation method for the cable jacket material. A raw material formula of the cable jacket material comprises, by weight, 100 parts of ethylene-vinyl acetate copolymers, 105-180 parts of flame retardants, 3-4 parts of antioxidants, 2.5-3 parts of stabilizers, 3-5 parts of lubricants, 2.5-4 parts of coupling agents, 2.5-3 parts of cross-linking agents and 0.5-1.5 parts of crosslinking auxiliaries, wherein the ethylene-vinyl acetate copolymers are made of ethylene and vinyl acetate by means of copolymerization. The preparation method includes the steps: mixing the ethylene-vinyl acetate copolymers, the antioxidants, the lubricants, the stabilizers, the cross-linking agents and the flame retardants by a banbury mixer, then feeding the mixture into a double-screw extruder for extrusion, granulating by granulation equipment prior to adsorbing dicumyl peroxide serving as the cross-linking agents and triallyl isocyanurate serving as the crosslinking auxiliaries, and obtaining the cable jacket material for the nuclear power station of the third generation after cooling. The cable jacket material is fine in performance, and the service life of the cable jacket material is longer than 60 years.

The invention belongs to the field of thermal treatment and particularly relates to a method for manufacturing a penetration layer for improving the high-temperature-oxidation resistance of K444 alloy. The method includes the steps that silicon powder, nickel-aluminum alloy powder, ammonium chloride, ammonium bifluoride, a bonder and a diluting agent are mixed into paste and the surface of a part made of the K444 alloy is sprayed with the paste; secondly, a well type thermal treatment furnace protected through argon gas is adopted, a sample is arranged in a clamp and protected through the argon gas, and an aluminum-silicon coating is obtained after heat is preserved; and thirdly, in order to achieve the purposes that the fragility of the surface of the aluminum-silicon penetration layer is reduced and by weight, aluminum on the outer surface of the penetration layer is larger than 10% and the silicon is smaller than 8%, the part made of the K444 alloy subjected to aluminum-silicon penetration is placed in a vacuum furnace for diffusion treatment. By the adoption of the penetration layer, the high-temperature-oxidation resistance of the K444 alloy can be remarkably improved and the penetration layer is suitable for being used for parts working in a severe environment for a long time and especially suitable for turbine blades of a gas turbine, and the service life of the blades can be prolonged.

The invention discloses a 3D-printing composite material with fragrance and antibacterial property, a preparation method and an application thereof. The 3D-printing composite material is prepared fromthe following components in parts by weight: 40-97 parts of high-molecular polymer, 0.2-55 parts of spice agent, 0.1-5 parts of antibacterial agent, 0.2-5 parts of plasticizing additive, 0.5-10 partsof organic additive, 0.5-5 parts of dispersing agent, 0.05-1 part of antioxidant and 0-1 part of pigment powder. The 3D-printing composite material disclosed by the invention has the beneficial effects that the fragrance with multiple types of fragrances is achieved, the original odor of plastics can be effectively covered or reduced, the antibacterial property and the mechanical property are good, and the types and manufacturing processes of materials in the technical field of 3D printing are enriched; in addition, the 3D-printing composite material is non-toxic and harmless, waste materialscan be naturally biodegraded and also can be recycled, so that the economic cost is lower relatively.

The invention provides a medical degradable magnesium alloy material with an iron ion membrane sputtered on the surface. The medical degradable magnesium alloy material is made of pure magnesium and a magnesium alloy; a bone nail, a bone plate or a bone scaffold is obtained through manners such as pressure casting, forging or machining; and an iron ion membrane layer is sputtered on the surface of the material through a magnetron sputtering machine. The invention further provides a preparation process of the medical degradable magnesium alloy material with the iron ion membrane sputtered on the surface, and the uniform iron ion membrane is sputtered on the surface of the bone nail, the bone plate or the bone scaffold which is made of pure magnesium and the magnesium alloy with a low-temperature magnetron sputtering method, so that the degradation speed of the degradable magnesium alloy material can be effectively slowed down, the material can be completely degraded within the required healing time of bone tissues of a human body, and the purpose of manual control of the degradation speed of the medical degradable magnesium alloy material is achieved.

The invention discloses an ultrasonic-mediated silk fibroin composite collagen raw hydrogel and a preparation method thereof. A regenerated silk fibroin solution is treated in ultrasonic short time topromote conformation transformation and physical crosslinking, and then the regenerated silk fibroin solution is mixed with collagen solution according to a certain proportion and uniformly stirred,the solution pH value is regulated, and the incubation is performed under a certain temperature to generate composite hydrogel. The mass ratio of the silk fibroin to the collagen is 99: 1-1: 99. The ultrasonic-mediated fibroin composite collagen hydrogel prepared by the invention is safe, nontoxic, good in biocompatibility, short in gelation time, controllable in degradation time, excellent in mechanical property, simple in preparation process, energy-saving, environment-friendly, low in cost and easy to industrialize, popularize and apply, and is physically blended in the whole process.

The invention relates to a citrate calcium sulfate skeleton replaceable material, relative compound, preparation and application, wherein it comprises: adding citrate into calcium sulphate dehydrate, or still adding metal crystallize agent, to mixed and arranged inside the vaporize kettle, to process high-temperature high-pressure reaction, to be obtained and dried. The invention can be used repair the skeleton, treat the osteoporosis, bone cancer, etc, with simple process, slow degrade speed, high strength, and low cost.

The invention relates to an injection containing amino acid and sodium hyaluronate and a preparation method of the injection, and belongs to the technical field of medical beautifying and biomedicine.The injection containing the amino acid and sodium hyaluronate is mainly prepared from, by weight, 1.7-17.2 parts of glycine, 0.5-5.2 parts of L-proline, 2.0-20.0 parts of L-leucine, 1.8-17.6 parts of L-lysine, 20.0-200.0 parts of sodium hyaluronate, 3.6-35.8 parts of an excipient, 1.4-14.3 parts of a stabilizer and 1,000 parts of injection water. The injection containing the amino acid and sodium hyaluronate is prepared by means of the method and can achieve quick filling, remove wrinkles, striae gravidarum and other flaws on the skin, promote the growth of new skin cells and promote the youthfulness of the facial state and has an anti-aging function.

The invention provides a stable Nicorandil freeze-dried powder injection, and further discloses a preparation method of the freeze-dried powder injection. The preparation method includes: performing afreeze drying process, wherein an annealing process is used in the freeze drying process. By the preparation method, the degradation speed of the Nicorandil freeze-dried powder injection can be greatly reduced, the stability of the Nicorandil freeze-dried powder injection is improved, impurities are decreased, product quality is improved, adverse reaction is decreased favorably, and medication safety of patients is ensured.

A process for preparing artificial active dual-layer skin tissue by use of bioreactor includes putting the composite collagen sponge as scaffold on the porous supporter in bioreactor, adding fibroblast suspension to the bioreactor for configuring the dermis, inoculating horny cells, and culturing for configuring epiderm.

The invention discloses a preparation method of a guided bone regeneration magnesium alloy membrane with antibacterial and synosteosis-promoting functions. The embodiment of the method comprises a magnesium alloy membrane and comprises the following steps for treating the magnesium alloy membrane: preparing a calcium phosphate coating on the surface of the magnesium alloy membrane so as to reduce a degradation speed of the magnesium alloy membrane; loading BMP-2 (Bone Morphogenetic Protein-2) on the surface of the magnesium alloy membrane containing the calcium phosphate coating; loading nano-silver particles on the surface of the magnesium alloy membrane loaded with the BMP-2. According to the novel membrane disclosed by the invention, the disadvantages that an existing absorbable membrane cannot establish and maintain a bone regeneration space very well and an existing non-absorbable membrane needs to be taken out through a secondary surgery can be overcome; and more importantly, an effective solution can be provided for solving GBR (Guided Bone Regeneration) postoperative infection and synosteosis failures.

The invention belongs to the technical field of agricultural medicament, and particularly relates to a pyraclostrobin and tebuconazole compounded microcapsule suspending agent and a preparation method thereof. The pyraclostrobin and tebuconazole compounded microcapsule suspending agent includes, by weight, 0.5-6% of pyraclostrobin, 4.5-24% of tebuconazole, 10-35% of a solvent, 8-25% of an emulsifier, 0-5% of an antifreezing agent, 2-10% of a stabilizing agent, 0-2% of a defoamer, 2-15% of a capsule skin material, 0-5% of a warning color, 0-5% of a pH regulator, 0-5% of a viscosity regulator, and the balance water. After microencapsulation of the pyraclostrobin and tebuconazole compound pesticide, negative influence of many environmental factors such as light, heat, air, rain water, soil, microorganisms and other chemical substances on active ingredients of the pesticide is suppressed, the evaporation, decomposition, oxidation, degradation and loss rates of the pesticide are reduced, and thus the stability of the pesticide is enhanced, and the use scope is enlarged.

The invention provides a high-toughness abrasion-resistant PVC hose and a processing method thereof. A rib line layer is processed between an inner layer and an outer layer of a hose body. The inner layer of the hose body is an elastic layer made of a high-toughness material. The outer layer of the hose body is an abrasion-resistant layer made of an additive abrasion-resistant material. The rib line layer is formed by sleeving and weaving nylon lines in an interlinked mode. The processing method of the high-toughness abrasion-resistant PVC hose mainly comprises the following steps that the inner-layer raw material is extruded through a first screw extruder and cooled to form the inner layer of the hose body, the rib line layers are woven on the surface of the inner layer through a net weaving machine, and one of the rib line layers is extruded through a second screw extruder to cover the outer layer on the rib line layer, so that the hose body is formed. According to the adopted technical scheme, due to the fact that the rib line layer is formed by weaving the nylon lines in a net shape and intersected mode, and upper, lower, left and right rib lines are connected together in an intersected mode, the tensile strength and the tear-resistant strength of the rib line layer and the elasticity of the hose body are enhanced; and because the inner layer and the outer layer of the hose are subjected to function division design according to the using environment, the outer layer is made of the abrasion-resistant material, and the inner layer is made of the high-toughness material, so that the structure of the hose body is more reasonable, and the service life of the hose body is longer.

The invention relates to a high-efficiency yield-increase wear-resistant polymer coated fertilizer for strawberries, which is prepared from the following raw materials in parts by weight: 0.3-0.6 part of hydroxymethyl cellulose sodium, 34-38 parts of rice bran, 33-35 parts of tobacco leaf powder, 60-65 parts of fruit peel, 43-46 parts of bamboo shoot shell, 21-24 parts of feather meal, 33-37 parts of rape seed cake, 15-18 parts of potassium chloride, 1-2 parts of borax, 0.02-0.04 part of Laetiporus sulphureus, 40-44 parts of cattle manure, 7-10 parts of calcium magnesia phosphate fertilizer, 18-24 parts of ammonium dihydrogen phosphate, 20-25 parts of urea, 0.5-1.0 part of zirconia, 6-9 parts of effective microorganisms, 11-14 parts of modified bamboo fiber, 3-5 parts of polyvinyl alcohol, 3-4 parts of diatomite, 2-3 parts of nano carbon, 1-2 parts of zinc sulfate, 0.2-0.4 part of polyoxyethylene fatty amine, 0.1-0.3 part of sodium persulfate, 3-4 parts of styrene, 0.1-0.2 part of 2-hydroxyethyl acrylate, 2-3 parts of acrylamide and a right amount of water. The high-efficiency yield-increase wear-resistant polymer coated fertilizer for strawberries has the advantages of high water retention property and high adsorptivity, and enhances the quality of the strawberries.

The invention relates to biological hydrogel for a 3D printed tissue engineering scaffold and a preparation method of the biological hydrogel and belongs to the technical field of 3D printing. The biological hydrogel is prepared from three or any two of raw materials in percentage by mass as follows: 20%-70% of DANCC (double aldehyde nano-crystalline cellulose), 20%-70% of COL (collagen) (types I and II) and 20%-60% of CS (chitosan). DANCC serves as a crosslinking agent to modify COL and/or CS, molecules of COL and CS can interact, two modification methods are combined, the stability and mechanical properties of the biological hydrogel are better improved, and biocompatibility and biodegradability are also improved. Results indicate that the anti-compression breaking strength of the hydrogel is improved by 8-15 times after addition of DANCC.

The invention discloses a soil improvement device for deteriorated grassland, and belongs to the environmental protection field. The soil improvement device comprises a vehicle body and a feeding mechanism, wherein the feeding mechanism is arranged at the bottom, close to a vehicle head, of the vehicle body and comprises a moving frame, a crushing head, a crushing mechanism and a mixing mechanism,the crushing mechanism is arranged on one side of the moving frame, the mixing mechanism is arranged in the middle of the vehicle body and comprises a nutritional groove, a liquid conveying pipe anda sowing mechanism, and the sowing mechanism is arranged on one side of a vibrating frame and comprises a material-storing slot, a sowing frame and a sowing shelf. According to the soil improvement device, mud in the deteriorated grassland is crushed, is input into the vibrating frame and is mixed with a nutrition solution in the nutritional groove, so that nutrients contained in the deterioratedmud are increased, and the deterioration speed of the deteriorated mud is decreased; seeds spilled from the sowing frame are mixed with the mud, so that a sowing purpose is achieved; and by utilizingthe soil improvement device, working steps of workers are reduced, and the working efficiency of the workers is improved.