34results about How to "Avoid toxic" patented technology

The invention relates to a method for preparing black zirconia ceramics at the low temperature and belongs to the technical field of the preparation of high-temperature structural material. The method respectively uses a homogeneous precipitation method for synthesizing a nanometer coloring agent, and a coprecipitation method for synthesizing nanometer zirconia powder, and adopts Fe-Co-Ni-Mn as a coloring agent. The zirconia powder is not added with any sintering additive, only added with small amount of coloring agent and sintered at the temperature of 1150-1350 DEG C, thus obtaining the black zirconia ceramics with excellent performance and bright color. As the homogeneous precipitation method is adopted for synthesizing coloring agent powder, the monodisperse nanometer particles with uniform powder granules, narrow size distribution and high purity are obtained so that the coloring agent easily colors the particles. As the coprecipitation method is used for synthesizing zirconia powder, nanometer particles with small granularity, big superficial area and high activity are obtained, and can reduce the temperature of the solid-phase reaction, greatly reduce the sintering temperature and solve the problem that the black coloring agent oxide decomposes and volatiles at the high temperature. Simultaneously the method adopts the Fe-Co-Ni-Mn as the coloring agent, thus avoiding the poisonous function of Cr on the human body.

The invention discloses a method for preparing a mesoporous molecular sieve MCM-48. The method comprises the steps of extracting effective ingredients in coal ash as silicon sources by adopting a single template agent cetyl trimethyl ammonium bromide (CTAB); and synthetizing MCM-48 under alkaline medium by a hydrothermal method. The synthetized mesoporous material is regular in ducts, single in aperture distribution, high in order degree, and large in specific surface area. The method is simple and feasible in actual operation, economic and environment-friendly, and can provide a new path for 'recycling' utilization of the coal ash; and the synthetized sample has practical application value.

The invention discloses a high-efficiency environment-friendly nickel stripper and a preparation method thereof, which solve the problems of low stripping speed and high stripping temperature of a nickel layer and hostile operating environment. Based on 100 parts by weight, the high-efficiency environment-friendly nickel stripper comprises the following substances: 5.19 to 12.82 parts of ethanediamine, 5.19 to 12.82 parts of sodium metanitrobenzene sulfonate, 0.74 to 1.71 parts of citric acid, 1.48 to 2.56 parts of an organic amine additive and 70.09 to 87.40 parts of pure water. The invention also discloses the preparation method of the high-efficiency environment-friendly nickel stripper. According to the high-efficiency environment-friendly nickel stripper and the preparation method thereof, quick stripping of the nickel layer is promoted; in particular, after the organic amine additive is used, the stripping speed of the nickel layer is greatly increased, the stripping temperature is reduced, and a great deal of smoke generated during stripping is reduced.

The invention belongs to the field of biological materials and interdiscipline of polymer chemistry and biochemistry and discloses a gelatin/nano silver composite material decorated by microbial transglutaminase and a preparation method and an application thereof. The gelatin/nano silver composite material decorated by microbial transglutaminase is prepared by utilizing a gelatin/nano silver composite material as main material and utilizing the microbial transglutaminase as a modifier, the material has good biocompatibility, non-toxicity and strong antibacterial activity, the mechanical properties and water stability of the material are good, and meanwhile, the material is simple in preparation process, mild in reaction conditions, easy to control and low in production cost, thereby having good application prospect and very extensive usage in biomedical materials and biomedicine field, such as antibacterial and biodegradable skin dressing capable of reducing infection and inflammation and protecting wound, wound healing agent and artificial skin, and the like.

The invention relates to a preparation method and application of a graphene nickel foam electrode. The preparation method comprises the steps of cleaning and drying nickel foam as a working electrode,carrying out scanning in a graphene oxide dispersion liquid by using a cyclic voltammetry to prepare a graphene oxide nickel foam electrode; and drying and then carrying out constant-potential reduction in a glycine-hydrochloric acid buffer solution to obtain the graphene nickel foam electrode. Compared with the preparation methods of other graphene electrodes, the preparation method of the graphene nickel foam electrode has the advantages of being cheap in raw materials, free of pollution, green and environment-friendly, and mass production is facilitated. The graphene nickel foam electrodesupported through the nickel foam has good capacitive performance in a neutral electrolyte and can be applied to the field of energy storage.

The invention discloses a two-dimensional graphene-coated copper composite material with a core-shell structure and a preparation method and application thereof. The structure of the graphene-coated copper composite material is a core-shell structure formed by coating nano-copper particles with outer-layer graphene, the graphene-coated copper composite material is constructed through an electrostatic adsorption self-assembly method, after graphene is coated with copper, copper particles can be prevented from being oxidized, the intrinsic catalytic capacity and conductivity of the composite material are guaranteed, expansion/compression of metal particles can be controlled, the synergistic effect between the two materials is promoted, and therefore the integrity of the composite material isremarkably improved. The two-dimensional graphene coated copper composite material with the core-shell structure has excellent electromagnetic shielding performances.

The invention provides a method for synthesizing finasteride. The method comprises the following steps: (1) dissolving trifluoroacetamide in solvent, reacting the solvent with trimethylchlorosilane in the presence of organic alkali or inorganic alkali, filtering out solid from reaction products, and collecting filtrate; and (2) dissolving the filtrate obtained in step (1) in the solvent, adding 3-carbonyl-4-aza-5 alpha-androstane-17 belta-tert-butylformamide and dehydrogenation agent into the solvent for reaction, and collecting target products from reaction products. The method has the advantages that the method has higher yield, high selectivity, and is simple and safe; after simple purification, the purity of the finasteride can reach more than 99 percent; moreover, the method has easily obtained reagents used in the whole reaction, simultaneously having high reaction yield and mild reaction conditions, reclaiming the solvent and facilitating the industrialized production.

The embodiment of the invention relates to an air filter screen, a filter material attached antibacterial composition. The antibacterial composition is prepared from the following components by mass:1-15 parts of an antibacterial agent, 1-10 parts of a porous carrier, 0.1-5 parts of a stabilizer, 0.5-5 parts of a surfactant and 1-15 parts of an adhesive; wherein the antibacterial composition is added into the filter material according to an addition amount of 2-70g/m<2>. The air filter screen has the effects of resisting bacteria, mildew and viruses and reducing peculiar smell.

The invention discloses an ELISA kit used for detecting a bovine abortus Chlamydia psittaci antibody and a preparation method thereof. The ELISA kit comprises a horizontally coated abortus Chlamydia psittaci, an ELIAS plate longitudinally coated with rabbit anti-bovine IgG-HRP as a second antibody, a washing liquid, a confining liquid, a substrate buffer solution A, a substrate buffer solution B and a stop solution, wherein the coated abortus Chlamydia psittaci antigen is abortus Chlamydia psittaci outer membrane protein OmpA, especially the recombinant protein of the abortus Chlamydia psittaci outer membrane protein OmpA.

The invention discloses a preparation method of a Firocoxib intermediate. The preparation method belongs to the technical field of chemical synthesis. The preparation method comprises the steps: adding isobutyryl-containing aryl halide, a catalyst, a ligand and thin alkali into an organic solvent at an air or oxygen atmosphere, raising the temperature to carry out a reaction for 10-20h, and then,carrying out aftertreatment to prepare 2-methyl-1-[4-(methylsulfonyl)phenyl]propane-1-ketone. According to the preparation method, isobutyryl-containing aryl halide is used as a reaction raw material,so that a high-yield target product can be obtained; in addition, compound raw materials such as thioether or sulfoxide capable of generating great environmental hazards are avoided from being adopted, so that the production is environment-friendly, meanwhile, few reaction steps are required, few side reactions are generated, and the purity and yield of a product are high.

The invention discloses a water-based coating for sports equipment. The water-based coating is prepared from the following components in parts by weight: 24-25 parts of water-based saturated polyester resin, 1-2 parts of ammonia neutralizing agent, 4-5 parts of curing agent, 0.2-0.3 part of wetting agent, 0.2-0.3 part of antifoaming agent, 0.3-0.4 part of leveling agent, 0.1-0.2 part of foam inhibitor, 52-53 parts of water-based white paste and 15-16 parts of deionized water. The water-based coating is environment-friendly, economical and durable; and a paint film has the advantages of high hardness, good flexibility, impact resistance, ultraviolet resistance and the like. The invention also provides a preparation method of the water-based coating for sports equipment.

The invention provides a method for producing biological fertilizer by using marijuana degumming waste liquid. The method comprises the following steps: (1) adding the marijuana degumming waste liquid and starch which serve as indicators into a reaction container, and under an alkaline condition, dropwise adding an iodine-potassium iodide solution, and stopping adding the iodine-potassium iodide solution till reaction liquid turns into light blue; (2) adding activated carbon for adsorption, standing for 30 to 60 minutes, performing filtering, thus obtaining filtrate A, adding glucan for stirring for 1 to 2 hours, performing filtering, and removing filter residues, thus obtaining filtrate B; (3) adding the filtrate B into a fermentation tank, and then adding a microbial agent for fermentation, thus obtaining biofertilizer stoste; (4) adding beta-cyclodextrin into the biofertilizer stoste, and stirring for 2 to 4 hours, thus obtaining required biological fertilizer. According to the method, harmful substances can be removed from the degumming waste liquid, which is produced by electrochemical-enzymolysis united degumming, through chemical treatment, and gum in the degumming waste liquid is turned into the biological fertilizer easily absorbed by plants through biological fermentation.

The invention provides a method for cultivating Pleurotus eryngii rich in organic selenium. The method for cultivating Pleurotus eryngii rich in organic selenium comprises: step 1, screening the first-grade strains; step 2, screening the second-grade strains; step 3, screening the third-grade strains; and step 4, screening the selected strains The above-mentioned three-level strains were inoculated into the compost of Pleurotus eryngii for cultivation. The method for cultivating Pleurotus eryngii rich in organic selenium provided by the present invention has put an end to the situation of spraying inorganic selenium on the artificial foliage in the past and externally forcibly increasing the content of selenium element; High utilization rate and conversion rate, strong selenium tolerance and stability; high quality and high yield of cultivated products.

The invention relates to a water pump external layer protection coating and a preparation method thereof, and relates to the technical field of pump productions. The coating is prepared from acrylic resin, mica powder, cupric gold powder, polypropylene adipate, dimethicone, isocyanate, phthalic anhydride, zinc pyrithione, ethyl palmitate, an antioxidant, diethylene glycol butyl ether, a VAE emulsion, white latex, beeswax, an antifoaming agent, a thickener, petroleum coke powder, aqueous stock white and deionized water. The preparation method comprises the following steps: 1, fully mixing all above materials except liquid materials, and stirring and dispersing the mixed materials; 2, milling all solid raw materials, adding all the solid raw materials into a container, adding the above liquids, and fully mixing the solid raw materials with the liquids to carry out emulsifying treatment; 3, cooing a material obtained in step 2 to 50-60 DEG C, and keeping the temperature for 20-30 min; and 4, cooing the stirred material to normal temperature, and continuously grinding the cooled material to form gel. The coating has the advantages of difficulty in scratch, convenience in production, long service life, good resistance to water and a high temperature, and long service life.

The invention discloses a rare earth containing enoki mushroom culture medium. According to the technical scheme, the culture medium comprises the raw materials as follows: 20-24 parts of rice bran, 28-30 parts of corn cob, 4-6 parts of corn flour, 4-6 parts of soybean meal, 10-14 parts of bran, 2-4 parts of beet pulp, 3-5 parts of cotton seed hulls, 1 part of calcium carbonate, 0.4-0.6 parts of a trace element supplement and 0.1-0.15 parts of a rare earth accelerator. Quality of enoki mushrooms is improved, and finally, the technical effects of promoting growth of the enoki mushrooms and increase of the protein content synchronously and improving the product competitiveness of production enterprises are achieved.

The invention provides a poplar pencil coating and a preparation method thereof and relates to the technical field of pump production. The poplar pencil coating is prepared from the following materials: acrylate resin, mica powder, red gold powder, polypropylene adipate, dimethyl silicon oil, isocyanate, ferulic acid, pyrrolidone carboxylic acid, ethyl palmitate, an anti-aging agent, diethylene glycol monobutyl ether, VAE emulsion, white glue, bee wax, an antifoaming agent, a thickening agent, petroleum coke powder, water-based stock white and deionized water. The preparation method comprises the following steps: 1) fully mixing the materials except the liquid material, and then, stirring and dispersing the mixture; 2) fully grinding the solid raw materials, adding all solid raw materials into a container, adding the liquid, carrying out full mixing, and carrying out emulsification treatment; 3) cooling the materials in the step 2) to 50-60 DEG C, and keeping the temperature for 20-30 minutes; and 4) cooling the stirred materials to room temperature, and continuously grinding the materials into a colloid. The poplar pencil coating is not easy to scratch, convenient to produce, long in service life and resistant to water and high temperature.

The invention discloses a natural polysaccharide sponge and a preparation method and application thereof, and belongs to the field of biomedical polymer materials. The preparation method of the natural polysaccharide sponge comprises the following steps: (1) preparing a solution A containing polysaccharide I with amino and an inorganic compound; (2) preparing a solution B containing polysaccharide II with aldehyde; (3) mixing the solution A and the solution B, and carrying out a cross-linking reaction to obtain hydrogel; and (4) freezing the hydrogel at -80 DEG C to -196 DEG C for 12-72 hours, and then performing freeze drying treatment to obtain the natural polysaccharide sponge. The natural polysaccharide sponge provided by the invention has the advantages of good hemostatic effect, light weight, strong liquid absorption and lower hemolysis rate, and the hemolysis rate of the natural polysaccharide sponge is less than 5%, meeting the biological safety requirements on biological materials in the national standard.

The invention relates to aspen wood pencil protective paint and a preparation method thereof and relates to the technical field of paint materials. The aspen wood pencil protective paint is prepared from an aqueous saturated polyester resin, an ammonia neutralizer, a white emulsion adhesive, beeswax, a defoamer, a thickener, shell powder, water-based white color paste and deionized water. The thickener comprises, by weight, hydroxymethyl fibers, bentonite, apatite, sepiolite powder and gypsum powder. The preparation method comprises 1) adding 24-25 parts of the aqueous saturated polyester resin into a container, carrying out stirring through a high-speed disperser along with gradual dropwise addition of the ammonia neutralizer, 2) grinding all the solid raw materials, adding all the solid raw materials into the container and carrying out full mixing emulsification, and 3) adding the water-based white color paste and white emulsion adhesive into the container, adding deionized water into the container, carrying out dispersion for 10-15min and testing pH of 7.5-8.5 to obtain the paint. The aspen wood pencil protective paint is safe and environmentally friendly, has no pollution, has high hardness, is not easy to scratch, is easy to produce and has a long service life.

The invention relates to the technical field of equipment, in particular to a full-automatic rotary inclined plane filling machine for a resin lens. The full-automatic rotary inclined surface filling machine for the resin lens comprises an inclined rotating disc, a control cabinet, a protective cabinet, a vertical supporting rod and an air cylinder fixing plate. The full-automatic rotary inclined surface filling machine for the resin lens can achieve unmanned production in the whole process of filling, avoids the harm to workers caused by toxicity, carcinogenicity and flammability of the lens, reduces the labor intensity of employees, provides the employees with the physical and mental health, and optimizes the factory environment. Per person beat of the manual operation is about 8-12 seconds, the per person beat of the automatic inclined plane filling machine is within 3 seconds, the filling efficiency of the resin lens is greatly improved, and the quality of the produced lens is more complete and uniform. The fully-automatic rotary inclined plane filling machine for the resin lens is simple in structure, convenient to use, and convenient to repair and clean, reduces the labor intensity of the workers, and is suitable for being used and popularized.

The invention discloses a synthesis method of 3,3,4,4-tetrafluoropyrrolidine and mainly solves the technical problems of poisonous introduced fluorine, relatively long steps and relatively low yield in the existing synthesis process. The synthesis method disclosed by the invention comprises four steps: firstly, mixing butanedione with chloroform, then, carrying out addition on the mixture and bromine to form 1,4-dibromo-2,3-butanedione; secondly, introducing sulfur tetrafluoride into the obtained 1,4-dibromo-2,3-butanedione, and carrying out a reaction to obtain 1,4-dibromo-2,2,3,3-tetrafluorobutane; thirdly, carrying out a high-temperature reaction on 1,4-dibromo-2,2,3,3-tetrafluorobutane and benzylamine to obtain 1-benzyl-3,3,4,4-tetrafluoropyrrolidine hydrochloride; and fourthly, carrying out catalytic hydrogenation debenzylation on 1-benzyl-3,3,4,4-tetrafluoropyrrolidine hydrochloride to obtain 3,3,4,4-tetrafluoropyrrolidine. The invention provides the synthesis method of 3,3,4,4-tetrafluoropyrrolidine which is relatively low in toxicity, low in raw material price, simple in operation and high in yield.

The invention specifically relates to a hierarchically porous TiO2 material and a preparation method thereof, and application of the hierarchically porous TiO2 material in protein adsorption, belonging to the field of hierarchically porous metal oxide materials. According to the invention, a triblock copolymer and a biomass material, i.e., a vegetable tanning agent, are used as double templates; non-toxic and low-valence soluble inorganic metal salt of titanium is used as a metal source; self-assembling is carried out mildly without high-temperature hydrothermal conditions so as to promote crystal form conversion; and finally, calcining is performed so as to form the hierarchically porous TiO2 material with a specific surface area of 32-142 m<2>/g and a pore size range of 1.8-94 nm. The invention provides a low-cost easily-operable synthetic route for preparation of the hierarchically porous TiO2 material; and the prepared hierarchically porous TiO2 material can effectively adsorb protein biomacromolecules in virtue of its large specific surface area and rich pore structures, and has good adsorption effect on protein substances in softening wastewater produced in tanning.

The invention discloses a preparation method of a microencapsulated fast curing agent for epoxy resin, and belongs to the field of curing agent preparation. According to the preparation method, the problems that a microencapsulated curing agent prepared by an existing method is complex in preparation process, and the wall material of the microencapsulated curing agent is prone to cracking in advance are solved. The preparation method comprises the steps that an active curing agent, PS and dichloromethane are prepared into an oil phase solution; a water phase solution is prepared; an oil-in-water emulsion is prepared; and a microcapsule precipitate is prepared, and the microencapsulated fast curing agent is obtained after filtering and drying. According to the preparation method, the evaporation of a microencapsulated solvent is achieved through a physical method, and operation is simple; the PS with good affinity with the epoxy resin is used for preparing a microcapsule, the decomposition or volatilization of the active curing agent in advance in the storage process of the epoxy resin can be effectively avoided, thus the room temperature storage period of an epoxy resin-typed pregreg is greatly prolonged, fast curing is achieved, the mechanical properties of epoxy resin products cannot be reduced, the vitrification transformation temperature of the PS is 100 DEG C, and the storage property of the microcapsule is good at room temperature. The preparation method is suitable for the fast curing agent of the epoxy resin.