64 results about "Metaphosphoric acid" patented technology

The invention belongs to the technical field of preparation processes of barium metaphosphate, and particularly relates to a preparation method of monodisperse micron-sized barium metaphosphate. The preparation method comprises the following steps: mixing purified barium carbonate slurry and phosphoric acid according to a certain molar ratio, reacting to obtain barium dihydrogen phosphate slurry, adding ethanol and a particle size regulating agent, uniformly mixing, and carrying out spray drying to obtain a crude product; the particle size regulating agent comprises ammonium citrate, polyalcohol and barium metaphosphate; and calcining the crude product to obtain the product monodisperse micron-sized barium metaphosphate. According to the preparation method, a small amount of particle size regulating agent and a certain amount of ethanol are added, a crude product with uniform particle size distribution is prepared under a spray drying process condition, and then calcination is performed to obtain the micron-sized barium metaphosphate with uniform particle size distribution.

The invention provides a long-circulation high-rate negative electrode material as well as a preparation method and application thereof, and belongs to the technical field of negative electrode materials. Silicon powder, tin powder and graphene are compounded and subjected to carbon coating, a three-dimensional conductive network is constructed, volume expansion is relieved, and conductivity, cycling stability and rate capability are improved; tungsten oxide serves as an interface stabilizer to form a protective layer, side reaction is inhibited, interface impedance is reduced, and a conductive network is enhanced; metaphosphoric acid is decomposed to generate an inorganic phosphate protective film, and nitrogen-doped carbon generated by urea decomposition is combined, so that the interface stability and conductivity are remarkably improved, and the cycle life is remarkably prolonged; lithium carbide reacts with vinylidene fluoride to generate a lithium fluorocarbon additive, and lithium ions are released in stages to reduce the first lithium loss and stabilize an interface; a vanadium-based metal-organic framework prepared from ammonium metavanadate and terephthalic acid is combined with pre-embedded lithium and graphitized carbon coating, so that a lithium ion transmission path is optimized, and the performance of the lithium ion battery is improved. The synergistic modification measures improve the long cycle stability and high rate performance of the negative electrode material.

The invention discloses a low dynamic fatigue type polyurethane elastomer, and relates to the technical field of organic polymer compounds, the low dynamic fatigue type polyurethane elastomer comprises 50-70 parts of polytetramethylene ether glycol, 75-100 parts of 1, 6-hexamethylene diisocyanate, 5-10 parts of a chain extender, 3-8 parts of a dispersant, 1-5 parts of a lubricant, 4-10 parts of a plasticizer, and 6-12 parts of a flame retardant filler. According to the low-dynamic-fatigue type polyurethane elastomer, due to the addition of the flame-retardant filler, during combustion, melamine is decomposed to generate non-combustible gases such as ammonia gas, the gases can dilute the concentration of oxygen and combustible gas in a combustion area and reduce the intensity of a combustion reaction, and meanwhile, phosphorus elements can form substances such as phosphoric acid and metaphosphoric acid at high temperature, so that the flame-retardant property of the polyurethane elastomer is improved. According to the present invention, the polyurethane elastomer and the flame retardant can capture free radicals in the gas phase and interrupt the chain reaction of combustion so as to inhibit the flame propagation, and can promote the char formation during the combustion process to form a compact carbon layer covering the surface of the polyurethane elastomer so as to provide good thermal insulation and oxygen insulation effects;

The application discloses a kind of high flame-retardant tpe materials and preparation method thereof, by polytetrahydrofuran, modified monomer and 4,4'-dicyclohexyl methane diisocyanate are reacted, chain extension is used with 1,4-butanediol, finally join flame-retardant additive, form branched structure, and the molecular structure of the pte material is branched structure, and molecular chain segment contains organic silicon composite organic phosphorus structure, when heat decomposition, can generate phosphoric acid, poly-metaphosphoric acid and other acidic substances, these acidic substances will catalyze pte molecule to occur dehydration reaction, accelerate its crosslinking, organic silicon chain segment will produce inorganic silicate or silicon-carbon, and then form a dense carbon layer on the surface of material, can heat insulation and oxygen isolation, prevent combustible gas to escape outward and oxygen diffusion inward, and slow down the further thermal decomposition of internal material, prevent carbon layer from being burnt through or collapse under high temperature, improve the durability of barrier, so that pte material has good flame-retardant effect.

A multi-component mortar system contains a curable aqueous-phase aluminous cement component A and an initiator component B in aqueous-phase for initiating the curing process. Component A further contains at least one plasticizer, water, and at least one blocking agent selected from phosphoric acid, metaphosphoric acid, phosphorous acid, and phosphonic acids. Component B contains an initiator, at least one retarder, at least one mineral filler, and water. A multi-component system is useful, which is ready-for-use, for chemical fastening of anchoring means, preferably of metal elements, in mineral surfaces, such as structures made of brickwork, concrete, pervious concrete or natural stone as well as its use for chemical fastening of anchoring means.

The invention provides a selective desulfurizer and a method for removing acid gas in gas. The selective desulfurizer comprises the following components in percentage by mass: 30-40% of organic amine A, 10-20% of organic amine B, 5-10% of an additive and 30-55% of water, the organic amine A comprises first organic amine and second organic amine, the first organic amine is methyldiethanolamine, and the second organic amine is monoethanolamine and / or diethanolamine; the mass ratio of the first organic amine to the second organic amine is (1-5): 1; the organic amine B comprises one or a combination of more than two of secondary amine 1, secondary amine 2 and secondary amine 3; the additive comprises one or a combination of more than two of phosphorous acid, hypophosphorous acid, metaphosphoric acid and pyrophosphoric acid. According to the technical scheme, carbonyl sulfide in the raw material natural gas can be selectively removed, carbon dioxide meeting the national standard is reserved, the defects of an existing process are overcome, and an efficient and green novel method is provided for natural gas purification.

This invention relates to the field of polymer materials technology, specifically disclosing a flame-retardant thermoplastic elastomer compound and its preparation method. The flame-retardant thermoplastic elastomer compound comprises 50-80 parts SEBS, 10-30 parts PP, 5-15 parts compatibilizer, 10-30 parts composite flame retardant, 3-10 parts plasticizer, 0.2-1 parts antioxidant, and 0.1-0.5 parts lubricant. The composite flame retardant is prepared by reacting and mixing an intumescent flame retardant, barium metaphosphate, boron nitride, triallyl isocyanurate, and SEBS. The flame-retardant thermoplastic elastomer compound of this application possesses good flame retardancy, mechanical properties, and water resistance stability.

The present application relates to the technical field of lithium ion battery recycling, in particular to a method for stripping lithium ion battery pole piece and application thereof. The method for stripping lithium ion battery pole piece comprises: immersing the pole piece into a mixed solution containing a stripping agent and a stripping aid for reaction, and obtaining the separated active material layer and the current collector layer after a period of time; the stripping agent comprises a carboxylic acid containing at least two carboxyl groups; the stripping aid comprises at least one of sodium fluoride, potassium fluoride, ammonium fluoride, phosphoric acid, sodium phosphate, monosodium phosphate, sodium metaphosphate, potassium phosphate, monopotassium phosphate, potassium metaphosphate, ammonium phosphate, disodium ethylenediaminetetraacetate, tetrasodium ethylenediaminetetraacetate, inositol hexaphosphate and its salt, inositol pentaphosphate and its salt, inositol tetraphosphate and its salt, and inositol triphosphate and its salt. The method can realize the separation of the active material and the current collector, the hydrogen production amount is small during the whole stripping process, the current collector obtained after stripping is intact, the separation time is short, and the separation efficiency is high.

The invention relates to a part made from synthetic graphite, preferably isostatic synthetic graphite, impregnated with aluminium metaphosphate Al(PO3)3, and characterised in that the aluminium metaphosphate content is at least 1% by weight for the cubic form and does not exceed 0.4% by weight, and preferably does not exceed 0.3% by weight, for monoclinic forms. Such a part has good resistance to oxidation and can be used under hydrothermal conditions.

The invention belongs to the field of fruit quality analysis, and particularly relates to a high performance liquid chromatography method for simultaneously determining organic acid and vitamin C in kiwi fruit, which comprises the following steps: grinding kiwi fruit into powder in liquid nitrogen, extracting with metaphosphoric acid solution, centrifuging, and collecting supernate to obtain test solution; a high performance liquid chromatograph is utilized, and under the chromatographic conditions that a C18 column is selected as a chromatographic column, the column temperature is 25-35 DEG C, the sample injection volume is 10 microliters, a 0.01 mol / L monopotassium phosphate buffer solution is used as a mobile phase for isocratic elution, and the organic acid and the vitamin C in a test solution are detected under the conditions that the flow speed is 0.5-0.8 mL / min and the wavelengths are 210 nm and 245 nm. The detection method provided by the invention can realize qualitative and quantitative analysis of flavor and nutritional ingredients of kiwi fruits, and has good specificity, accuracy, durability and stability and high detection sensitivity.

The invention discloses a preparation method of a high-flame-retardant graphene polystyrene board, modified polystyrene is added into a mold, heat preservation is carried out for 30-60 s under the conditions that the steam temperature is 110-130 DEG C and the pressure is 0.3-0.5 MPa, the high-flame-retardant graphene polystyrene board is prepared, when the polystyrene board is burnt, a phosphorus compound in modified filler is decomposed to generate a phosphoric acid liquid film, a polystyrene board matrix is protected, and the high-flame-retardant graphene polystyrene board is prepared. The phosphoric acid is further dehydrated to generate metaphosphoric acid, the metaphosphoric acid is polymerized to generate polymetaphosphoric acid, the substances can form stable cross-linked solid substances and form a carbonization layer, internal silicon and boron elements can promote the carbonization layer to form a ceramic silicon carbon layer, and nitrogen elements can generate a large amount of gas, so that the ceramic silicon carbon layer expands; the expanded ceramic silicon-carbon layer has better heat insulation and oxygen insulation effects, and a lamellar structure continuous with graphene can effectively prevent oxygen from entering the material, so that combustion is prevented, and the flame-retardant effect is achieved.

The present invention provides a liquid enzyme preparation of an enzyme having excellent activity stability. Stability of enzymatic activity is improved by accommodating a liquid enzyme preparation that includes an enzyme into a container the internal space of which has been replaced by an inert gas, or by adding, to a liquid enzyme preparation containing a protein deamidase, an additive selected from the group consisting of sugar alcohols, glycerin, ethanol, sulfites, lecithins, citrates, polyphosphates, tartrates, phytic acid, metaphosphoric acid, sodium chloride, tocotrienols, methionine, pectins, beet pigment, capsicum pigment, rosemary extract, tocopherols, tea extract, and butylated hydroxyanisole.

The application provides a preparation method of high-content 2-trifluoromethyl-4-heptafluoroisopropylaniline, in which 2-trifluoromethyl aniline and 2-bromine heptafluoropropane are reacted in the presence of hydrosulfite, a solvent and a catalyst to obtain high-content 2-trifluoromethyl-4-heptafluoroisopropylaniline through reaction and post-treatment; the catalyst is selected from phosphoric acid, pyrophosphoric acid, hypophosphorous acid, metaphosphoric acid, phosphorous acid, pyrophosphorous acid, hydrobromic acid, hydrogen bromide gas, hydrogen chloride gas or sodium bisulfite. The preparation method is simple in operation and mild in chemical reaction conditions; under the preferred reaction conditions, the conversion content reaches more than 96% in one reaction, the post-treatment steps are few, rectification is not needed, the content of the final product is more than 98%, the total reaction yield is more than 93%, the industrial production is easy, and the method has a high application prospect.

The present application relates to a kind of high hardness polyurethane and its preparation method and application.The phosphorus-containing polyol structural formula is as follows: the phosphorus-containing polyol is prepared by ester exchange reaction using phosphorus-containing diol and dialkyl carbonate.High hardness flame-retardant thermoplastic polyurethane elastomer is prepared from the phosphorus-containing polyol.The phosphorus-containing polyol can decompose phosphoric acid, metaphosphoric acid and other substances during heating, promote the dehydration and carbonization of polyurethane, and form a dense carbon layer that is not easy to burn, thereby achieving excellent flame-retardant effect.

The invention discloses a metaphosphoric acid rapid cooling device and a use method thereof. The metaphosphoric acid rapid cooling device comprises a cylindrical barrel; the barrel cover covers the top of the cylindrical barrel body; the feeding hole is formed in the center of the cylinder cover; the chassis is hermetically and rotatably connected with the bottom of the cylindrical barrel; the telescopic rod comprises a sleeve and a piston rod, and the sleeve is fixedly connected with the center of the chassis; the large bottom of the conical drainage piece is fixedly connected with the tail end of the piston rod, and the conical head part of the cylindrical drainage piece corresponds to the feeding hole; the annular cavity is distributed around the inner wall of the cylindrical barrel and surrounds the telescopic rod and the conical drainage piece, a first gap is reserved between the edge of the conical drainage piece and the inner wall of the annular cavity, and a second gap is reserved between the bottom of the annular cavity and the base plate; and the cooling medium is filled in the annular cavity. The metaphosphoric acid cooling device has the beneficial effects that metaphosphoric acid is cooled for multiple times, and the cooling rate is increased.

To provide a calcium carbonate filler for biodegradable resin that can enhance the efficiency of biodegradability of the biodegradable resin used in combination, a biodegradable resin composition using the same, and a resin molded article. 【Solution means】 The calcium carbonate filler for biodegradable resin of the present invention is a surface treatment agent containing a polyphosphoric acid-based surface treatment agent component, the polyphosphoric acid surface treatment agent component contains at least one polyphosphoric acid, and the converted amount of metaphosphoric acid (P2O5) contained in the polyphosphoric acid is 75% by mass or more and less than 100% by mass based on the mass of the polyphosphoric acid. It is surface-treated with a surface treatment agent and contains surface-treated calcium carbonate particles that satisfy the following formula: 0.8 ≦ A ≦ 3.0 (μm), 13,000 ≦ B ≦ 30,000 (cm 2 / g), C ≦ 100 (ppm), 4.0 ≦ D ≦ 8.5, 800 ≦ E ≦ 5000 (ppm), 0.1 ≦ Tw ≦ 0.8 (mass%). Here, A is the average particle diameter of 50% of the surface-treated calcium carbonate particles, B is the specific surface area by the air permeability method, C is the residue on a 45 μm sieve of the JIS standard sieve, D is the pH when made into a 10% by mass aqueous suspension, E is the content of phosphorus element measured by an inductively coupled plasma optical emission spectrometer, and Tw is the thermal weight loss at 200 to 500 °C measured by a differential thermal balance device.

A multi-component mortar system contains a curable aqueous-phase aluminous cement component A and an initiator component B in aqueous-phase for initiating the curing process. Component A further contains at least one plasticizer, water, and at least one blocking agent selected from phosphoric acid, metaphosphoric acid, phosphorous acid, and phosphonic acids. Component B contains an initiator, at least one retarder, at least one mineral filler, and water. A multi-component system is useful, which is ready-for-use, for chemical fastening of anchoring means, preferably of metal elements, in mineral surfaces, such as structures made of brickwork, concrete, pervious concrete or natural stone as well as its use for chemical fastening of anchoring means.

This invention relates to the field of health food testing technology, and particularly to a method and system for rapid determination of ascorbic acid enantiomer content in health foods using ultra-high performance phase chromatography (UHPLC). After extraction with metaphosphoric acid solution via ultrasonication in the dark, centrifugation, and filtration, the sample is separated using a Waters Acquity BEH column. Gradient elution is performed using supercritical carbon dioxide and 0.1% phosphoric acid methanol solution as the mobile phase, under conditions of 13.8 MPa system back pressure, 31 °C column temperature, and 245 nm detection wavelength. The contents of D(−)-ascorbic acid and L(+)-ascorbic acid are determined using the external standard method. This invention can achieve effective separation of the two ascorbic acid enantiomers in a short time, and has advantages such as fast analysis speed, good separation effect, high accuracy, good repeatability, and low organic solvent consumption. It is suitable for quality control and regulatory detection of ascorbic acid enantiomers in various health foods such as tablets, capsules, and liquids.

The invention relates to an optical cable belting material with high flame retardance and high resistivity, and belongs to the technical field of flame-retardant materials. The preparation method of the optical cable belting material comprises the step of coating the calcium carbonate powder and the intumescent flame retardant on a base material through vinyl acetate-ethylene copolymer emulsion and water to obtain the optical cable belting material. When the optical cable belting material is combusted, the calcium carbonate powder and the intumescent flame retardant are subjected to chemical reaction in flame combustion to form a calcium metaphosphate / carbonaceous composite flame-retardant coating, and the flame-retardant coating is constructed by embedding lamellar calcium metaphosphate continuous networks in a carbon layer. The calcium metaphosphate continuous network can control the combustion process of the composite coating, and the peak heat release rate and the smoke generation rate are remarkably reduced; and the expansion degree and the structural uniformity of the carbon residues are effectively improved, and a conductive path of a carbon layer is destroyed, so that the surface resistivity of the flame-retardant coating is improved. The preparation process is simple, the coating performance is excellent, and the coating is suitable for high-flame-retardant and high-resistivity optical cable belting materials.

The application relates to the technical field of heat-sensitive materials, and discloses a film-coated heat-sensitive material and a preparation method thereof. The application is characterized by the following steps: preparing a base material, cutting the base material into a required shape and size, coating a heat-sensitive dye, uniformly spraying the heat-sensitive dye on the base material, drying the base material coated with the heat-sensitive dye, preparing a finished product, cutting the dried base material into a required final product shape and size, and obtaining the film-coated heat-sensitive material. The modified polyurethane and boron element in the phosphorus-containing flame retardant have good flame-retardant effects. In the combustion process, the phosphorus element in the phosphorus-containing flame retardant decomposes into a non-flammable liquid film of phosphoric acid, further generates metaphosphoric acid and poly-metaphosphoric acid, these substances form a protective layer on the material surface, isolate oxygen and high temperature, and have the flame-retardant effect. The quaternary ammonium salt in the quaternary ammonium chain extender has good antibacterial effect.

The invention discloses a production process of a high-strength steel wire rope core flame-retardant conveying belt for a mine, which comprises the following steps: adding PVC master batch, modified filler, a reinforcing agent and benzoyl peroxide into an internal mixer, carrying out internal mixing treatment to obtain pretreated PVC, adding the pretreated PVC and a boron trifluoride-monoethylamine complex into a double-screw extruder, extruding, placing on the surface of a modified conveying belt core, and carrying out extrusion molding to obtain the high-strength steel wire rope core flame-retardant conveying belt for the mine. According to the present invention, the conveying belt can produce phosphoric acid, metaphosphoric acid and polyphosphoric acid during combustion, the organic silicon can produce a large amount of Si-O bonds and Si-C bonds so as to form the compact silicon-carbon layer, and the porous foam rubber carbon layer containing the metal oxide and produced by the composite charcoal is arranged in the silicon-carbon layer so as to form the porous foam rubber carbon layer; the carbon layer on the surface of the conveying belt has a good heat insulation effect, combustible gas is prevented from entering the conveying belt, release of smoke is reduced, and therefore the use safety of the conveying belt is improved.

The present invention provides a long-cycle high-rate negative electrode material and its preparation method and application, which belong to the field of negative electrode material technology. By compounding silicon powder, tin powder and graphene and performing carbon coating, a three-dimensional conductive network is constructed to alleviate volume expansion and improve conductivity, cycle stability and rate performance; tungsten oxide is used as an interface stabilizer to form a protective layer, inhibit side reactions, reduce interface impedance and enhance the conductive network; metaphosphoric acid decomposes to form an inorganic phosphate protective film, which is combined with nitrogen-doped carbon generated by urea decomposition to significantly improve interface stability, conductivity and cycle life; lithium carbide reacts with vinylidene fluoride to generate a lithium fluorocarbon additive, which reduces the initial lithium loss and stabilizes the interface by releasing lithium ions in stages; a vanadium-based metal-organic framework prepared from ammonium metavanadate and terephthalic acid is combined with pre-embedded lithium and graphitized carbon coating to optimize the lithium ion transmission path and improve its performance. These synergistic modification measures improve the long-cycle stability and high-rate performance of the negative electrode material.

The invention relates to a sealing solution and a preparation method and application thereof, and relates to the technical field of anodic oxidation. The invention provides a preparation method of a sealing solution, which comprises the following steps: (1) mixing a fluotitanic acid solution, a zirconium fluoride solution, a glycerol solution, a sodium metaphosphate solution and water to obtain a stock solution; and (2) adding pure water into the stock solution, and uniformly stirring to obtain a closed solution. When the prepared sealing solution is used for preparing a part oxide layer, a surface film layer with ultrahigh sealing performance and excellent corrosion resistance can be obtained, the vacuum leak rate of the surface film layer is as low as 10-12 Pa.L / s, the corrosion-resistant hydrochloric acid Bubble test exceeds 4 h, and the requirements for ultrahigh sealing performance and excellent corrosion resistance are met.

The invention provides a preparation method of lithium difluorophosphate, and belongs to the technical field of lithium battery electrolytes.The method comprises the step that lithium phosphate, lithium metaphosphate and phosphorus pentafluoride react in supercritical carbon dioxide to obtain the lithium difluorophosphate, and the specific reaction equation comprises Li3PO4 + 2LiPO3 + 2PF5 = 5LiPO2F2. The method has the advantages of being high in reaction conversion rate, free of by-products, environmentally friendly, simple in process and suitable for large-scale industrial production.

The invention discloses a preparation method of a caprolactam ammoniation catalyst, the caprolactam ammoniation catalyst and application, and belongs to the field of catalysis. Comprising the following steps: S1, mixing a carrier with an alkali solution, treating I, drying I and roasting to obtain a treated carrier; s2, mixing an active component precursor solution with the treated carrier, dipping, and drying II to obtain a catalyst precursor; and S3, treating the catalyst precursor II in a water vapor atmosphere to prepare the caprolactam ammoniation catalyst, the active component precursor is selected from at least one of phosphoric acid, metaphosphoric acid, ammonium dihydrogen phosphate, diammonium hydrogen phosphate, polyphosphoric acid, phosphomolybdic acid and phosphotungstic acid. The prepared catalyst is applied to a reaction for preparing 6-aminocapronitrile through caprolactam ammonification, has high conversion rate and selectivity, also has high stability, and can stably operate for a long period.

The invention relates to the technical field of battery materials, and discloses a lanthanum metaphosphate coated lithium cobalt oxide composite material and a preparation method thereof. The preparation method comprises the following steps: taking trivalent metal lanthanum salt and phosphate as raw materials, obtaining high-purity lanthanum metaphosphate through a solid phase method, then dispersing the lanthanum metaphosphate into a solvent, adding lithium cobalt oxide, and carrying out wet coating, so as to obtain the lithium cobalt oxide material coated with a lanthanum metaphosphate shell. The lanthanum metaphosphate coated lithium cobalt oxide composite material provided by the invention has excellent conductivity, rate capability and cycle performance.

The utility model relates to the technical field of battery production, particularly provides an anti-blocking device and a waste gas treatment system comprising the anti-blocking device, and aims to solve the problem that a waste discharge pipeline is blocked by metaphosphoric acid in the existing photovoltaic battery production. In order to achieve the purpose, the anti-blocking device is arranged on the waste discharge pipeline and comprises an outer shell and a heating component, and the heating component is arranged in the outer shell and used for heating the waste discharge pipeline. In the production of photovoltaic cells, metaphosphoric acid waste gas generated after the reaction of a diffusion furnace and phosphorus oxychloride enters the liquid accumulation bottle through the waste discharge pipeline to be condensed and filtered, and in the waste gas flowing process, the waste discharge pipeline is heated through the heating component, so that the temperature of the metaphosphoric acid waste gas is increased, and the metaphosphoric acid waste gas is prevented from being solidified into a solid state to cause pipeline blockage; therefore, the difficulty and the frequency of equipment maintenance are reduced, possible damage to equipment is reduced, and the influence on the production efficiency is prevented.

The invention relates to the technical field of sodium-ion battery positive electrode materials, and discloses a sodium-ion battery positive electrode material and a preparation method thereof, a sodium-ion battery and electric equipment. The sodium-ion battery positive electrode material comprises a substrate and a coating layer coating at least part of the surface of the substrate, the chemical formula of the substrate is NaxNiaFebMncMdO2, x is greater than or equal to 0.85 and less than or equal to 1.1, a is greater than 0 and less than 1, b is greater than 0 and less than 1, c is greater than 0 and less than 1, d is greater than 0 and less than 0.5, a + b + c + d = 1, and M is selected from at least two of Ti, Mg, Cu, Ca, Al, Zn, La, Cr, Y, Ce, Si, Sn and W; the coating layer comprises metaphosphoric acid metal salt, and metal elements in the metaphosphoric acid metal salt are selected from at least one of Y, La, Al, Li, Na, Ba and Ca. The battery positive electrode material provided by the invention is applied to the sodium-ion battery, so that the sodium-ion battery has good cycling stability and excellent specific capacity.

This invention provides a multi-component system, particularly a two-component mortar system, that overcomes the shortcomings of conventional systems. [Solution] The above problems are solved by a two-component mortar system for chemical fixation of fasteners in a mineral substrate, comprising a curing aqueous phase alumina cement component A and an initiator component B in the aqueous phase for initiating a curing process, wherein component A further comprises at least one blocking agent selected from the group consisting of boric acid, phosphoric acid, metaphosphoric acid, phosphorous acid, and phosphonic acid, and water, and component B comprises blocked blast furnace granulated slag, water, and optionally at least one mineral filler, and a ready-to-use two-component system for chemical fixation of fasteners in a mineral substrate such as brickwork, concrete, permeable concrete, or natural stone structures, preferably metallic elements, and its use for chemical fixation of fasteners.

The present application relates to the field of biological products and veterinary medicine, and discloses a method for extracting and purifying blood gonadotropin, which comprises the following steps: 1) adjusting the pH of pregnant mare serum to 4.5-5.0 by using metaphosphoric acid, and performing solid-liquid separation to collect supernatant; 2) precipitating the supernatant by using a first precipitant, and collecting filtrate; 3) precipitating the filtrate by using a second precipitant, collecting precipitate, and drying the precipitate to obtain crude blood gonadotropin; 4) dissolving the crude blood gonadotropin, and sequentially performing first ultrafiltration, affinity chromatography, second ultrafiltration, and cation exchange chromatography to obtain crude blood gonadotropin filtrate; precipitating the crude blood gonadotropin filtrate by using a third precipitant, collecting precipitate, and drying the precipitate to obtain pure blood gonadotropin. The purity of the blood gonadotropin prepared by the extraction and purification method can reach more than 99.9%, the total yield can reach 88.9%, and the titer can reach 11000 IU / mg.