88results about How to "Short degreasing time" patented technology

The invention discloses a method for manufacturing dentate special-shaped ceramic components by injection molding, belonging to the technical field of high-performance ceramic preparation. The methodcomprises the following steps: evenly mixing 81wt% to 90wt% of ceramic powder and 10wt% to 19wt% of organic binders by weight percentage to obtain an injection-molding mixture, injection-molding the injection-molding mixture on an injection-molding machine with the injection temperature being 175 to 195 DEG C, to obtain a green body, and de-molding within 2 minutes after the injection, so as to obtain a molded green body; and then, subjecting the molded green body to water-extraction degreasing and thermal degreasing, sintering the degreased green body at 1,350 to 1,550 DEG C, holding for 1 to4 hours and furnace-cooling to obtain the ceramic components. The invention has the advantages of high automation degree, high molding and degreasing efficiencies, even green body, high dimensional accuracy and surface smoothness of sintered products, and environment-friendly and energy-saving manufacture.

The invention provides a preparation method of a low-nickel high-nitrogen austenitic stainless steel product. The method comprises the steps of mixing 200-mesh iron powder, chromium powder, manganese powder and manganese powder as raw materials, with the purity of not less than 99.0%, and 200-mesh graphite powder according to the mass ratio of (66-72): (16-18): (10-12): (2.0-3.5): (0.1-0.3), grinding the above powder in a nitrogen environment, mixing with an adhesive, and then performing mixing and injection molding, catalytic debinding, residual adhesive desorption, sintering densification and sintering densification to obtain the low-nickel high-nitrogen austenitic stainless steel product. The low-nickel high-nitrogen austenitic stainless steel product provided by the invention has the characteristics of higher sintered density, nitrogen content and dimensional precision, excellent mechanical property and decay resistance and the like, thereby being suitable for large-scale industrial manufacturing.

The invention disclose a method for preparing allograft acellular dermal matrixes, comprising the following step of processing animal skins into the allograft acellular dermal matrixes by using processes of preparation of segmented skin, viral inactivation, degreasing, decellularization, freeze-drying, cutting, molding, packaging and irradiation disinfection. The method for the preparing allograft acellular dermal matrixes has the advantages of short degreasing time, high efficiency, complete decellularization and small damage to natural structures of dermal extracellular matrixes.

The invention provides a binding agent for powder injection moulding, a preparation method of the binding agent and an application method of the binding agent. The binding agent is mainly prepared from the following components in percentage by mass: 65 to 75 percent of polyformaldehyde, 4 to 9 percent of dioctyl phthalate, 6 to 13 percent of polyethylene, 1 to 3 percent of acrylate copolymer, 3 to 8 percent of polyacrylamide, 1.5 to 4 percent of paraffin, 2 to 6 percent of microcrystalline wax and 0.5 to 2 percent of ethylene vinyl acetate copolymer. In the binding agent provided by the invention, multiple types of components are combined through scientific compatibility, so that the compatibility between metal powder or ceramic powder and the binding agent can be obviously improved, and meanwhile, the binding agent can be quickly removed in a degreasing process without causing the defects of bubbling and cracking of a green body, so as to guarantee the quality of the green body.

The invention discloses a method for preparing starch nanocrystal, and belongs to the field of modified starch processing. The method is based on the principle that lipid layers in waxiness corn starch grains have resistance for acid, the starch is prompted to be crushed because of homogenization treatment under a certain pressure, the lipid is prompted to be digested through Soxhlet extraction by using an alcohol-water solution, a pore structure from outside to inside is formed, then the resistance to the acid is eliminated, and the penetration of the acid inside the starch is prompted under a negative pressure condition so as to accelerate hydrolysis of the starch grains in an amorphous area. The method specifically comprises the following steps: homogenously crushing the starch grains under a pressure of 50-150 MPa, degreasing the crushed starch by using a 70-90% methanol-water solution, and accelerating hydrogen ions in sulfuric acid to rapidly penetrate into the starch grains to be subjected to restrictive hydrolysis under a 0.06-0.1MPa negative pressure condition, so as to prepare the nanocrystal. Through the technical measures, the hydrolysis period of the starch is shortened to be 48-72 hours, the starch nanocrystal yield is greatly improved to be 19-25%, and the particle size distribution is 20-300nm.

The invention provides a preparation method of an injection-moulded special-shape ceramic. The preparation method comprises the following ceramic green body degreasing steps: (1) immerging a ceramic green body into a solvent, sealing, maintaining at 40-70 DEG C and the pressure of 0.2-0.6 Mpa for 2-6 hours, and then taking out the ceramic green body; (2) airing the ceramic green body obtained from the step (1), then placing into embedding powder, drying at 180-200 DEG C, and naturally cooling; (3) heating the ceramic green body obtained from the step (2) to 300-400 DEG C, and maintaining at the pressure of 0.1-0.5 Mpa for 1-2.5 hours. The preparation method provided by the invention can be used for fast degreasing at low temperature by adopting an organic solvent without toxicity or hydrolytic oxidation, is simple in process operation, high in production efficiency and suitable for batched and automatic production, and can be used for improving the working environment and preventing the damage of toxic organic substance volatilization on the environment.

The invention discloses a non-phosphorus degreasing agent. The non-phosphorus degreasing agent is mixed solution prepared from the following components, wherein each liter of the mixed solution comprises the following components in part by weight: 2.0 to 4.0 grams of fatty alcohol-polyoxyethylene ether sodium sulfate, 4.0 to 6.0 grams of nonylphenol polyoxyethylene ether, 4.0 to 5.0 grams of fatty alcohol-polyoxy alkyl ether, 3.0 to 4.0 grams of fatty alcohol-polyoxyethylene ether, 2.0 to 4.0 grams of lauryl sodium sulfate, 2.0 to 3.5 grams of isopropanol, 0.1 to 0.12 gram of ethylene diaminetetraacetic acid, 1 to 2 grams of alkaline lipase and the balance of water. When the non-phosphorus degreasing agent is used for degreasing the metal, the non-phosphorus degreasing agent reduces the adsorbability of an active agent to the metal body, facilitates subsequent processing of the metal, has high degreasing speed, shortens degreasing time, improves working efficiency and is non-phosphorus and environment-friendly.

The invention relates to the technical field of ceramic manufacturing, in particular to a manufacturing method of laminated ceramics. Slurry can be applicable to a DLP photo-curing face forming method to manufacture laminated ceramic bodies by optimizing the composition and proportioning of the slurry, the forming efficiency is high, ceramic particles in the bodies can be dispersed evenly, and the shape and size accuracy of the bodies is high; then the bodies cannot deform and crack in the manufacturing process by controlling process parameters in degreasing and sintering steps, the laminated ceramics with micron-scale thickness can be manufactured and are uniform in compactness, good in surface smoothness, high in accuracy and excellent in performance, and manufactured ceramic products are high in reliability. The manufacturing method adopts a two-step degreasing method integrating vacuum/atmosphere protection degreasing and air degreasing, can remarkably improve the degreasing efficiency, enables the degreasing time to be shortened from 48-60 hours required by an existing method to 8-20 hours and can also decrease the defects including deformation, cracking, blistering and the like of the bodies due to the too high one-step degreasing and heating rate or the too high pyrolysis rate of organic matter in the bodies.

The invention relates to a high entropy alloy feeding and a preparation method and an application thereof. The high entropy alloy feeding comprises, by volume, 40%-70% of high entropy alloy powder, and 30%-60% of high molecular binder. The high entropy alloy feeding has the excellent properties of the high entropy alloy so that the high entropy alloy can be introduced in a metal injection molding technology, and application range of the high entropy alloy is expanded. According to the high entropy alloy feeding and the preparation method and the application thereof, the high entropy alloy feeding is applied to the metal injection molding technology, product stability during the injection molding process can be improved, the high entropy alloy product obtained has more than 97.5% of sintered density, production of high entropy alloy components and parts with complex production structures, excellent properties and high precision requirements is achieved beneficially. The high entropy alloy feeding has good economic benefit and application prospect.

A process for preparing molybdenum part with high size precision and compactness includes preparing adhesive from paraffin wax, high-density polyethene, polypropene and stearic acid through proportionally mixing, mixing it with molybdenum powder, injection moulding, degreasing, presintering, sintering, holding the temp for 1-10 hr, and post treating.

The invention relates to a ceramic, a ceramic injection molding feeding material and a preparation method thereof. The ceramic injection molding feeding material comprises, by mass, 80-83% of ceramicpowder and 17-20% of a binder. The binder comprises a water-soluble binder and a water-insoluble binder. A mass ratio of the water-soluble binder to the water-insoluble binder is (60-70): (23-35). TheCIM research process comprises researching binder selection, molding and discharge. The ceramic, ceramic injection molding feeding material and preparation method thereof have the advantages of low cost, short degreasing time, high efficiency, environmental pollution, no pollution and small product deformation.

The invention discloses an energy-saving and environment-friendly mink skin tanning method, which comprises the following working procedures of: A) carrying out a soaking working procedure in soaking solution with the solution formula of 25g/L of table salt and 1g/L of soaking enzyme100-c; B) carrying out a degreasing and re-soaking working procedure in degreasing and re-soaking solution with the solution formula of 1ml/L of degreasing agent (Supralan80), 1ml/L of wetter ethanoic acid (HAC) and 0.5ml/L of degreasing enzyme200; C) carrying out a softening and picking working procedure in softening and picking solution with the solution formula of 40g/L of table salt, 2-3ml/L of Super lotan A, 0.5ml/L of Sinxit and 6g/L of glycolic acid; and D) carrying out a tanning working procedure in tanning solution with the solution formula of 40g/L of table salt, 10g/L of aluminite powder (Novaltan Al) and 4-5g/L of Tanning assist B. The energy-saving and environment-friendly mink skin tanning method disclosed by the invention has the advantages of simpleness in manufacturing and processing the mink skin, small water consumption and pollution, and higher energy saving and environment protection effect.

The invention relates to the technical field of preparation of polypeptides of Japanese croakers and particularly relates to a preparation method of fish skin immunomodulatory peptides of Japanese croakers. The preparation method comprises the following steps: performing degreasing on fish skin by lipase combined with isopropanol to eliminate the bitter taste of immunomodulatory peptides; then, treating the fish skin through tartaric acid, a pulsed electric field and a reductive amination reagent to weaken the crosslinking degree among fish skin molecular proteins and enhance the swelling of the fish skin proteins; dissolving out the fish skin proteins in the fish skin as much as possible by virtue of the action of papain, chymotrypsin, trypsin, aspergillus serine protease or/and alkali protease and other protein extraction enzymes with weaker decomposition effect on the fish skin proteins at the temperature of 50-60 DEG C; and then, decomposing the fish skin proteins by virtue of thecombined action of neutral protease and neutral metal protease to obtain the fish skin immunomodulatory peptides. The utilization ratio of the fish skin proteins is high, the chain breaking decomposition uniformity is high, and the molecular weight of the obtained immunomodulatory peptides is 2000-3500Da.

The invention relates to a technology for shaping a ceramic-based composite material, which is integrated with principles of pressure injection, gel-casting and impregnating for preparing the ceramic-based composite material blank in complicated shape, even density of structure compositions and high strength so as to obtain a high-tenacity ceramic-based composite material product through sintering. The technology provided by the invention is a novel technology for shaping the ceramic-based composite material with high performance, complicated shape and fiber reinforcement, low cost and approximate net dimension. Compared with the prior art for shaping the fiber-reinforced ceramic-based composited material, the technology has the advantages of obvious superiority, short shaping time and high production efficiency.

The invention discloses a method for preparing acellular bone, comprising the following step of processing animal bones into acellular bones by using processes of preparation of bone pieces, viral inactivation, degreasing, decellularization, freeze-drying, cutting, molding, packaging and irradiation disinfection. The method for preparing acellular bone has the advantages of short degreasing time, high efficiency, strong protection effect on bone tissue structures, complete decellularization and small damage to natural structures of bone extracellular matrixes.

The invention discloses injection forming feed for superfine hard alloy and a preparation method thereof, and relates to the field of powder metallurgy. The feed is prepared from, by mass, 92-94.5% ofsuperfine hard alloy powder and 5.5-8% of a binding agent, wherein the binding agent is prepared from 59.0-69.0% of polyformaldehyde (POM), 23.0-35.0% of polyethylene glycol (PEG), 3.0-4.0% of high density polyethylene (HDPE), 2.0-2.5% of an ethylene-vinyl acetate copolymer (EVA) and 1.0-1.5% of stearic acid (SA). The PEG is added after the superfine hard alloy powder is preheated, after the PEDand the superfine hard alloy powder are mixed uniformly, the POM, HDPE, EVA and SA are added for mixing, and the preparation is completed. The feed adopts oxalic acid for catalyzing degreasing, so that the degreasing time can be reduced obviously, the production efficiency can be improved obviously, the use of acid catalysts and toxic solvents which are harmful to the environment is avoided, and the injection forming feed is economical and environmentally friendly and has a broad application prospect.

The present invention provides a preparation method of dried salted large yellow croakers. The dried salted large yellow croakers are prepared by pre-treating, fish flesh perforating, ultrasonic assisted pickling, low-temperature dehydrating, quantifying, vacuum packaging and mild sterilizing. The prepared instant dried salted large yellow croakers can also be preserved for a long term; the quality of the product is improved; and the dried salted large yellow croakers have a shelf life of 30-60 days at a normal temperature and a shelf life of 300-360 days at a cold storage, and overcome problems that the processed dried salted large yellow croakers by using the prior art are high in oil content, need cold storage, are hard in texture, poor in mouthfeel, short in time, etc.

The invention aims at providing a method for simultaneously analyzing multiple aromatic hazardous substances in food, that is, a method for simultaneously extracting and preparing PAHs (Polycyclic Aromatic Hydrocarbons), phenolic compounds and aromatic amine in food. According to the method, sampling of only one time is needed, the sample consumption is reduced, the inspection time is shortened, the use amount of reagents is saved, secondary pollution is reduced at the same time, and the service life of a HPLC (High Performance Liquid Chromatography) chromatographic column is prolonged; as target detected substances are extracted by using an organic solvent ultrasonic extraction method, the extraction time of the target detected substance is greatly shortened; steps for extracting and preparing a sample liquid of PAHs in food are simplified, and organic solvent liquid-liquid extraction-reextraction degreasing is utilized in the PHAs detection process, so that the degreasing time is greatly shortened, and the experimental operation is simplified.

The invention relates to a cosolvent assisting degreasing method of light-cured 3D printed aluminum oxide ceramic biscuits. The cosolvent assisting degreasing method of light-cured 3D printed aluminum oxide ceramic biscuits comprises following steps: 1, aluminum oxide ceramic biscuits are immersed in a degreasing solution; 2, after immersion, the aluminum oxide ceramic biscuits are introduced into watch glasses with flat bottoms, the surface solution is removed using dust-free paper, and natural air drying is carried out; 3, after natural air drying, the aluminum oxide ceramic biscuits are introduced into a muffle furnace, are heated to 350 to 650 DEG C at a heating rate of 0.1 to 8 DEG C/min in air atmosphere, and then thermal insulation treatment is carried out for 0.5 to 5h. According to the method, cosolvent assisting degreasing is adopted, so that aluminum oxide ceramic biscuit degreasing time is shortened, aluminum oxide ceramic biscuit internal stress generated in heating process is reduced, the product structure after degreasing is more uniform, no surface crack is caused, and no deformation is caused. The cosolvent assisting degreasing method of light-cured 3D printed aluminum oxide ceramic biscuits is capable of shortening degreasing time, increasing degreasing efficiency and production efficiency, and can be used in the field of aluminum oxide ceramic production.

The invention discloses an environment-friendly type microbial degreasing agent. The environment-friendly type microbial degreasing agent comprises two components A and B, wherein one liter of the component A comprises the following raw materials: 2.0 to 4.0 grams of fatty alcohol-polyoxyethylene ether sodium sulfate, 4.0 to 6.0 grams of nonylphenol polyoxyethylene ether, 4.0 to 5.0 grams of fatty alcohol polyoxy alkyl ether, 3.0 to 4.0 grams of fatty alcohol-polyoxyethylene ether, 2.0 to 4.0 grams of lauryl sodium sulfate, 2.0 to 3.5 grams of isopropanol, 0.1 to 0.2 gram of ethylene diamine tetraacetic acid, 4 to 6 grams of sodium metasilicate and the balance of water; and one liter of the component B comprises the following raw materials: 3 to 5 grams of soluble starch, 2 to 4 grams of glucose, 0.5 to 1.0 gram of peptone, 0.2 to 0.5 gram of calcium carbonate, 0.5 to 0.8 gram of magnesium sulfate, 1 to 2 milligrams of vitamin E, 5 billion units of bacillus and the balance of water. When the environment-friendly type microbial degreasing agent is used for degreasing the metal, the adsorbability of an active agent to the metal body is reduced; and the bacillus can degrade grease, so the service life of bath solution is prolonged, degreasing time is shortened, working efficiency is improved, and degreasing cost is reduced.