258 results about "Metaphosphoric acid" patented technology

An extractant for extracting proanthocyanidin from plant is metaphosphoric acid and / or sulfite. Its extracting process includes adding water to prepare solution, regulating pH value, immersing extracting by controlling temp and time, filtering, purifying, solvent eluting, concentrating and drying. Its advantages are dosage of extractant, high extracting rate and high purity and water solubility of product.

The invention relates to a novel low-smoke zero-halogen flame-retardant cable sheath material, which comprises the following components in percentage by weight: 15-35 percent of low-density polyethylene, 15-35 percent of ethylene-vinylacetate copolymer, 8-30 percent of modified nano magnesium hydroxide, 2-6 percent of microencapsulated red phosphorus, 8-19 percent of thermoplastic phenolic resin, 1.8-3 percent of dicumyl peroxide as a crosslinking agent, 0.1-0.25 percent of antioxidant 1010, 1-3.5 percent of lead sulfate tribasic as a lead compound and 0.1-1 percent of N-salicyl aminophthalimide as a copper inhibitor. According to the novel low-smoke zero-halogen flame-retardant cable sheath material, the consumption of the modified nano magnesium hydroxide is reduced by adding the thermoplastic phenolic resin and the microencapsulated red phosphorus on the basis of ensuring the performance of mechanical energy, and the purpose of synergically retarding flame is achieved. When the cable sheath material burns, the microencapsulated red phosphorus absorbs a great deal of water decomposed and released when the modified nano magnesium hydroxide burns, to generate phosphoric acid, metaphosphoric acid, polymetaphosphoric acid and the like which cover the surface of the thermoplastic phenolic resin with higher carbon content, so that the surface of the thermoplastic phenolic resin can be dehydrated and carbonized in an accelerating way to form a thick liquid film layer for isolating oxygen and heat from the inside sheath material, and thus burning can be weakened or interrupted, and the flame-retardant effect of the cable sheath material is enhanced; meanwhile, the novel low-smoke zero-halogen flame-retardant cable sheath material disclosed by the invention has the advantages of zero halogen, low smoke formation amount during burning and little pollution to environment.

The invention discloses an inverted pyramid structure of a polysilicon surface and a fabrication method of the inverted pyramid structure. The method comprises the following steps: preparing black silicon by different methods; rinsing a sample in a mixed liquid of hydrogen peroxide and ethanol amine; and carrying out retreatment on the washed black silicon in a mixed liquid of hydrogen peroxide, hydrofluoric acid, metaphosphoric acid and ammonium fluoride, so as to form the inverted pyramid structure of the polysilicon surface. A wet-chemical method which is different from acid and alkaline corrosion is adopted. According to the method, the effects of anisotropy can be reduced to the maximal extent; and the black silicon with different nano-structures can be corroded into a nano textured structure with a regular inverted pyramid structure through oxidation. Compared with the traditional polycrystalline silicon texture, the polysilicon inverted pyramid light-trapping structure disclosed by the invention is relatively high in light utilization rate and relatively low in reflectivity, so that the polysilicon inverted pyramid light-trapping structure has the characteristics of the inverted pyramid structure; compared with the traditional high surface recombination of a small and dense structure of the black silicon, the surface recombination is obviously reduced; and the efficiency of a solar cell is higher.

This invention discloses one enzyme immune test method and agent case for 3- methyl quinoline 2-carboxyl acid in immune chemical analysis technique field, which comprises the following steps: processing immune antigen and cover antigen and alloantibody and pre-processing sample and establishing ELISA method; the matched agent case is composed of 3- methyl quinoline 2-carboxyl acid alloantibody covered by MQCA and egg albumin couple and MQCA standard sample; the sample is processed through metaphosphoric acid to release MQCA and MAX and indirectly competition ELISA method.

The invention relates to a halogen-free flame retardant containing linear phenolic aldehyde and a polymer material containing the halogen-free flame retardant. A small quantity of metal hydroxides can be added simultaneously for serving as synergistic flame retardants. Phosphorus pentoxide generated by the combustion of red phosphorus reacts with a phenolic hydroxyl group in the linear phenolic aldehyde, and phosphonic acid or metaphosphoric acid and the like are generated simultaneously; and the acids of the type are further used for catalyzing dehydration and char formation of phenolic resin, and are esterified with the phenolic hydroxyl group, so that an organic-inorganic hybrid barrier layer is formed. The barrier layer is used for blocking heat conduction, diffusion and permeation of oxygen and overflow of combustible matter and slowing material degradation and the like, so that combustion is stopped finally, and flame is extinguished. A flame retarding effect can be further improved by using a small quantity of hydroxides and inorganic flame retardants containing crystal water. A halogen-free flame retardant composition can be used for retarding combustion of polymers and polymer compositions. A halogen-free flame retardant system disclosed by the invention has the advantages of low cost, low toxicity, wide application and the like, and contributes to environmental protection.

The invention discloses a cleaning method for quartz devices used by a diffusion process in manufacturing of a photovoltaic cell, and belongs to the field of the photovoltaic technology. The quartz devices, such as a quartz tube, a quartz boat, a tail gas tube and a spraying tube are required by the diffusion process in manufacturing of the photovoltaic cell; the quartz devices are subjected to metaphosphoric acid deposition, and contamination by dust, chippings and the like after long-term use; and consequently, abnormal manufacturing, and decline of the cell conversion efficiency are caused. The cleaning method provided by the method adopts a mixed acid cleaning method and a pure water cleaning method to remove the contamination of the quartz devices so as to ensure the normal production operation and to improve the yield and the conversion efficiency of the cell.

Brind dry bamboo shoots is produced through the processes of soaking dry bamboo shoots with 15-30 wt% water content in hot water solution of sodium sulfite at 60-100 deg.c for 30-90 min; boiling in water solution of sodium sulfite and composite phosphate preparation prepared with metaphosphoric acid, polyphosphoric acid and pyrophosphoric acid at 60-100 deg.c for 4-8 hr and letting stand for one night; boiling in hot water and letting stand for one night; soaking in table salt solution of 15-30 wt% concentration for 20-60 min; squeezing to dewater to 20-40 wt% water content; vacuum packing inside high temperature and high pressure resisting plastic bag, disinfection and detection in a metal detector.

The invention relates to a halogen-free fire retardant containing benzoxazine and polymer material comprising same. A small quantity of metallic oxide or hydroxide can be simultaneously added to serve as a fire-retardant synergy agent. Phosphorus oxide, phosphoric acid, metaphosphoric acid, polyphosphoric acid and the like generated by burning red phosphorus is dewatered through reacting with a great quantity of phenolic hydroxyl generated by solidifying benzoxazine resin to produce an inorganic-organic hybridized barrier layer, the barrier layer has good wettability to a matrix polymer, and barrier property is improved. Meanwhile, an organic part has an adsorption function on organic smoke gas so as to greatly improve fire-retardant efficiency. A small quantity of metallic oxide or hydroxide can enhance the stability of the barrier layer to further improve fire-retardant effect. The composite is applied to polymers, polymer based composites and products of the polymers and the polymer based composites, and fire-retardant effect is good. The halogen-free fire retardant disclosed by the invention has the characteristics of low cost, wide application range and good fire-retardant property.

The invention discloses a three-dimensional fiber-based composite aerogel type adsorbent preparation method. According to the method, cellulosic fiber, chitosan and sodium alginate which generally exist in natural world are utilized as raw materials. The method comprises the steps: firstly, utilizing periodate and metaphosphoric acid to sequentially chemically modify the cellulosic fiber; then crosslinking the modified cellulosic fiber with the chitosan; then compounding with the sodium alginate; freeze drying to obtain a three-dimensional fiber-based composite aerogel type adsorbent. The prepared adsorbent disclosed by the invention has high safe stability, has a good adsorption effect on negative ion pollutants and positive ion pollutants and can be applied to purifying heavy metal ion wastewater and dyestuff wastewater; in addition, the cellulosic fiber added into the adsorbent disclosed by the invention not only can serve as a framework and a reinforcing material, but also can be crosslinked with the chitosan to improve compression strength, morphology and structural stability of the whole aerogel adsorbent; thus, the adsorbent can be repeatedly used for many times, and the characteristics of rice inner holes and large specific surface area of the aerogel are fully played.

The invention relates to a soldering flux and in particular relates to a soldering flux of a busbar of a lead-acid storage battery. The soldering flux comprises the following components in percentage by weight: 8-15% of metaphosphoric acid, 3-8% of phosphate, 10-15% of ethyl alcohol, 1-5% of carmine and the rest of water, wherein the total weight percentage is 100%. The invention aims at providing a soldering flux of a busbar of a lead-acid storage battery and solving the problems that a plate lug is undesirably melted together with a lead solution, a plurality bubbles are generated after the lead solution is cooled and the lead solution is not adhered to the plate lug.

The invention discloses a process for preparing a chinlon delustering agent. The process comprises the following steps of: (1) adding deionized water into a preparation tank and adding a dispersing agent in an amount which is 0.1 to 0.3 percent of the mass of titanium dioxide, wherein the dispersing agent is 8 to 12 percent metaphosphate solution; (2) predispersing; (3) mixing the titanium dioxide, the deionized water and the metaphosphate solution uniformly; (4) dispersing the titanium dioxide to be below 1 mu m by using a dispersing pump and cooling titanium dioxide suspension to 20 to 35 DEG C by using a cooling device, wherein the dispersing pump and the cooling device are connected with the outlet at the bottom of the preparation tank; (5) conveying the titanium dioxide suspension into a settling tank to settle at the temperature of between 20 and 35 DEG C for 18 to 30 hours; and (6) conveying the titanium dioxide suspension subjected to settlement into a storage tank. The invention also discloses equipment for preparing the chinlon delustering agent. By the process and the equipment for preparing the chinlon delustering agent, the preparation time of the titanium dioxide is reduced; the dispersing ratio and the utilization ratio of the titanium dioxide are increased; and spinning broken ends are reduced.

The invention provides an electrolyte, an anodization method and an anodized silicon-aluminum alloy. The electrolyte contains equivalent silicate ions and equivalent metaphosphate ions, wherein the equivalent silicate ions refer to silicate ions converted from all ions and particles containing a silicon element based on equal silicon element content, and the quivalent metaphosphate ions refer to metaphosphate ions converted from all ions and particles containing a phosphor element based on equal phosphor element content; and the electrolyte refers to an alkaline hydrosol. By adopting the electrolyte, an anodization film with good hardness, wear resistance and corrosion resistance can be formed on the surface of the silicon-aluminum alloy.

A refractory composition and processes for manufacture are provided where the compositions possess improved refractory alkali resistance and superior handling properties. Compositions and processes for their manufacture may include a plurality of ceramic particles and a binder sintered to the particles wherein the binder includes crystalline aluminum orthophosphate distributed as the result of an in situ reaction of aluminum metaphosphate with alumina. Kits provided according to the invention provide materials for use in manufacture of a composition where the kit includes aluminum metaphosphate and a nonfacile additive.

The invention discloses a method for preparing 5-hydroxymethylfurfural from carbohydrate. In the method, metaphosphoric acid is used as a catalyst, carbohydrate including glucose, levulose, sucrose and the like can be converted into 5-hydroxymethylfurfural with high yield in an ionic liquid-water or sodium chloride solution-organic phase diphasic system at a reaction temperature of 100-200 DEG C within the reaction time of 2-30h. The method disclosed by the invention has the advantages of mild reaction conditions, simpleness in post-treatment and easiness in realizing industrialization. The selected catalyst has a good catalysis effect on the sucrose, the levulose and the glucose and is also suitable for various reaction systems such as the ionic liquid-water or sodium chloride solution-organic phase diphasic system and the like. The catalyst has the good catalysis effect particularly for the glucose so as to have a higher industrial value.

The invention relates to an oil-water well chemical resin type sand consolidating agent and a sand prevention technology. The technology formula includes: 5 percent to 10 percent of organic silicon resin, 15 percent to 20 percent of dispersant (furfural), 10 percent to 15 percent of mutual solvent (acetaldehyde), 10 percent to 15 percent of curing agent (metaphosphoric acid), 15 percent to 20 percent of emulsion splitter, 15 percent to 20 percent of aniline modified phenol formaldehyde resin, 25 percent to 30 percent of hydrochloric acid, 5 percent to 10 percent of trolamine, 5 percent to 10 percent of aluminium sulphate, and 5 percent to 10 percent of OP10. The technology includes: washing sand to the required position of design, putting sand in an operating tool string according to design requirements, pre-processing the oil layer, then selecting a positive-substitute resin type sand consolidating agent for squeezing the resin type sand consolidating agent and displacing liquid, lifting the sand out from the operating tool string after pressure naturally diffuses, and finally coming to well completion after 72 hours of coagulation.

Disclosed is an extracting solution for use in the extraction of a residual veterinary drug in livestock product or seafood. The extracting solution contains 0.05 to 1% of metaphosphoric acid and comprises a buffer solution of pH 5.5 to 7.5. The extracting solution can extract plural veterinary drugs at the same time, and can be used preferably used for the extraction when the residual veterinary drug is an antibacterial substance. By using the extracting solution, it becomes possible to extract plural veterinary drugs efficiently at the same time without impairment of stability because of its neutral pH range. Hence, the extracting solution enables to determine a residual veterinary drug in livestock product or seafood rapidly in a simple manner.

The invention relates to a preparation technique of high-purity potassium chloride, which comprises the following steps: (1) adding a hydrochloric acid solution into agricultural potassium chloride, stirring, and carrying out solid-liquid separation; (2) adding a KOH solution into the solid phase, dissolving by heating, keeping the temperature, and filtering to obtain a high-temperature oversaturated potassium chloride mother solution; (3) adding a sodium hexametaphosphate solution into the high-temperature oversaturated potassium chloride mother solution, and stirring until the mother solution is cooled to room temperature, thereby obtaining a potassium chloride slurry; and regulating the mass percent of the potassium chloride crystal in the potassium chloride slurry, carrying out cyclone grading, and drying the obtained potassium chloride coarse crystal to obtain the high-purity potassium chloride. The technique has the advantages of energy saving, consumption reduction, short technical process, simple equipment, low investment, high product purity (at least 99.5%), high potassium chloride yield (at least 95.5%) and favorable potassium chloride crystallinity. The potassium chloride with the particle size of 1mm above accounts for 70 wt% of the total potassium chloride, and the impurity content is lower than 0.3%; and thus, the potassium chloride satisfies the requirements in GB25585-2010.

The invention discloses a cleaning method for a multicrystal silicon gate, which is applied before a tungsten silicide layer is deposited on the surface of the multicrystal silicon gate. The prior cleaning method can not remove metaphosphoric acid crystals on the surface of the multicrystal silicon gate, thereby the yield rate of devices is affected. The cleaning method of the invention adopts hydrogen fluoride to clean the surface of the multicrystal silicon gate and adopts mixture of sulfuric acid and hydrogen peroxide solution to clean the surface of the multicrystal silicon gate. By adoption of the cleaning method provided by the invention, autoxidation layers and the metaphosphoric acid crystals which are formed on the surface of the multicrystal silicon gate can be effectively removed, thereby the adhesivity of the multicrystal silicon gate and tungsten silicide is effectively improved; the interface defects of the multicrystal silicon gate and the tungsten silicide are reduced; the yield rate of products is improved.

The invention relates to a method for extracting vitamin C from ginseng fruits. The method comprises the following steps: (1) washing fresh ginseng fruits, sterilizing the fresh ginseng fruits at low temperature, then adding a ginkgo biloba extract, a honeysuckle extract and sodium sulfite, and pulping to obtain ginseng fruit pulp; (2) taking an aqueous solution comprising 2-3wt% of oxalic acid, 0.5-1wt% of hydrochloric acid and 0.5-1wt% of metaphosphoric acid as an extraction solution, soaking at 40-60 DEG C for 1-30 minutes according to a volume ratio of the extraction solution to the ginseng fruit pulp of (5-8):1, filtering to obtain filtrate, and extracting the filtrate for 2-3 times; (3) combining the filtrate, then concentrating and drying to obtain the vitamin C of the ginseng fruits. The extraction rate of the extraction method reaches over 95%; the index of heavy metals in the extracted vitamin C conforms to the state regulations.

The invention discloses a phosphorus-silicon composite flame retardant as well as a preparation method and application thereof. The phosphorus-silicon composite flame retardant is a cage-like tetraphenyl trisilicate phosphorus silsesquioxane shown in the description, and the flame retardant is prepared according to the following steps: firstly hydrolyzing POSS to chipping POSS under the action of an organic alkali, and then carrying out reaction of the chipping POSS with metaphosphoric acid. Experiments show that the phosphorus-silicon composite flame retardant provided by the invention gives full play to the advantages of a silicon flame retardant and a phosphorus flame retardant, compensates defects of the silicon flame retardant and the phosphorus flame retardant, has significant synergistic flame retardance and complementarity, and excellent thermal insulation, smoke suppression and oxygen supply cutoff functions, also has the functions of protecting the environment, safety and preventing molten drop, can be directly used for preparing silicone rubber, can not only improve the flame retardance of the silicone rubber, but also perfect the thermal insulation, smoke suppression and mechanical properties of the silicone rubber, and the phosphorus-silicon composite flame retardant has the advantages of being low in preparation and application costs, easy to realize large-scale industrialized production, and the like.

The invention belongs to fields of immunochemistry analysis. It discloses an enzyme-uniting immune method and reagent box used in detection of quinoxaline-2-carboxyl acid residues, the method mainly contain medicine reconstruction, the preparation of immunogen, peridium antigen and antibody and pretreatment of sample and building of ELISA detecting method. The reagent box comprises quinoxaline-2-carboxyl acid (QCA) specificity antibody, QCA standard substance, enzyme target-object peridiumed with coupling substance of egg albumin and reaction production of QCA and gamma-aminobutyric acid. The sample is hydrolysed by metaphosphoric acid to discharge QCA, and cleaned by MAX column, derivatized by butyl amine, indirect competition ELISA is adopted in detection. The method and reagent box in the invention has advantages of simpleness, speediness, sensitivity and accuracy, large-lot samples can be detected fast and simultaneously, lowest detecting limit is 0.6 mug / kg.

The invention discloses a polysilicon surface reverse pyramid structure and a preparation method thereof. Back silicon is manufactured by use of different methods, then, a sample is placed in a mixed liquid of hydrogen peroxide and ethanolamine, then washed black silicon is placed in a mixed liquid of hydrogen peroxide, hydrofluoric acid, metaphosphoric acid and ammonium fluoride for reprocessing, and thus the polysilicon surface reverse pyramid structure is formed. According to the invention, by use of a wet chemical method different from soda acid corrosion, the method can reduce the influence of anisotropy to the maximum degree, and the back silicon with different nano structures is enabled to have a nanometer textured structure with a regular reverse pyramid structure through oxidation corrosion. Compared to a conventional polysilicon textured structure, the polysilicon reverse pyramid light tripping structure is higher in utilization rate of light and lower in reflectivity. Due to the feature of its reverse pyramid structure, compared to high surface recombination of the small yet dense structure of conventional black silicon, the surface recombination of the polysilicon surface reverse pyramid structure is obviously reduced, and the efficiency of a solar battery is higher.

A pigment grade corrosion inhibitor and a method of forming the inhibitor is disclosed. The inhibitor is comprised of a host species comprised of an inorganic compound having a layered structure and a guest species comprised an anionic species of a weak acid. The host species is preferably a double hydroxide having a structure of: [M(II)1-xM(III)x(OH−)2] [An−x / n.y H2O], where M(II) is a divalent metal cationic species, M(III) is a trivalent metal cationic species, and An− is an anionic species, preferably with the species present in a range of: 0.2≦M(III) / (M(II)+M(III))≦0.4. The guest species include: ortho-phosphoric, pyrophosphoric, tripoly-phosphoric, polyphosphoric acid; mono- and di-alkyl or aryl-esters of ortho-phosphoric and pyrophosphoric acid; metaphosphoric, trimeta-phosphoric, poly-metaphosphoric acid; phosphorous (phosphonic) acid; derivatives of phosphonic acid; alkyl and aryl esters of thio-phosphoric and dithio-phosphoric acid; molybdic, phospho-molybdic, silico-molybdic acid; boric acid; cyanamidic acid; nitrous acid; derivatives of thio- and dithiocarbonic acid, including o-alkyl esters; derivatives of dithiocarbamic acid, including N-alkyl dithiocarbamates; pyrrolidinecarbodithioic acid; thio-organic compounds functionalized with at least one —SH group of acidic character, including: 2,5-dimercapto-1,3,4-thiadiazole (DMTD), 2,4-dimercapto-s-triazolo-[4,3-b]-1,3-4 thiadiazole, trithiocyanuric acid (TMT), and dithiocyanuric acid, various N—,S— and N,N—, S,S— and N,S-substituted derivatives of the above DMTD and TMT compounds; various S-substituted derivatives of trithiocyanuric acid; dimer and polymer derivatives of the above DMTD and TMT compounds, including 5,5′ dithio-bis (1,3,4 thiadiazole-2(3H)-thione or (DMTD)2, and (DMTD)n, polymers of DMTD and (TMT)2, dimers and polymers of TMT; various combinations of all the above; soluble salts of DMTD and TMT; poly-ammonium salt of DMTD or (DMTD)n and TMT formed with polyamines; mercapto-benzothiazole, mercapto-benzoxazole, mercapto-benzimidazole, and combinations, thereof; di- and poly-mercapto compounds, including: di-mercapto derivatives of thiophene, pyrrole, furane, diazoles, and thiadiazoles; di- and tri-mercapto derivatives of pyridine, diazines, triazines, benzimidazole, and benzothiazole, including dimercaptopyridine, 2, 4-dithiohydantoine, and 2,4,-dimercapto-6-amino-5-triazine; and carboxylic and di-carboxylic acids, including ascorbic, salicylic acid, phthalic acid, nitro-phthalic acid, succinic acid, and derivatives of succinic acid, including 1-(benzothiazol-2-ylthio)succinic acid.

The antiscale and anticorrosive cleaning agent is prepared through the processes of soaking tannin containing plant material, such as tea, in boiled water, filtering out dregs at 70-80 deg.c, adding sodium metaphosphate in certain proportion to dissolve, adding sodium pyrophosphate in certain proportion to dissolve, mixing homogeneously and filtering. The said cleaning agent can prevent boiler from forming scale and being oxidized by dissolved oxygen in water for long period.

The invention relates to the technical field of artificial board preparation, and in particular relates to a preparation method of a refractory moisture-proof wheat straw board. The preparation methodprovided by the invention comprises the following step of taking rice straw and wheat straw as raw materials to prepare modified straw fragments, and adding methyl triethoxysilane into a flame retardant material, processing to obtain silica gel microencapsulated ammonium polyphosphate, mixing a modified soybean protein adhesive with the silica gel microencapsulated ammonium polyphosphate to obtain a flame retardant adhesive, and finally, bonding and hot-pressing wheat straw board layers to obtain the wheat straw board. According to the preparation method provided by the invention, a silica gel microencapsulated ammonium polyphosphate is prepared by wrapping ammonium polyphosphate with the silica gel, thus improving the thermal stability of ammonium polyphosphate. In addition, ammonium polyphosphate can co-decompose with the protein adhesive in a high temperature combustion process to form metaphosphoric acid, and prevent oxygen and heat from further diffusing into the polyurethane foam, thus improving the refractory and flame retardant properties of the wheat straw board; methoxy groups and amine substances in the protein adhesive react to form potassium methyl silicate, and forma waterproof mineral film on the surface of the straw board, and broad application prospect is obtained.

The invention discloses polished anti-corrosion synthetic leather slurry and a preparation method thereof. The polished anti-corrosion synthetic leather slurry comprises the following raw materials in parts by weight: 55-60 parts of SG-6 PVC resin, 60-80 parts of polyurethane resin, 4-6 parts of protein powder, 4.5-5.5 parts of zinc oxide, 5-7 parts of manganese dioxide, 10-12 parts of silicon carbide, 8-10 parts of groundnut leaves, 1-3 parts of dimethyl silicone oil, 2-3 parts of metaphosphoric acid, 0.4-0.6 part of butyl acetate, 1-1.5 parts of p-hydroxybenzoic acid, 0.4-0.6 part of N,N'-methylene bisacrylamide, 0.5-1.0 part of ammonium persulfate, 2-4 parts of epoxy chloropropane, 3-4 parts of citric acid, 0.3-0.5 part of coco fatty acid diethanol amide, 1-2 parts of sulfosalicylic acid and 40-50 parts of methyl isobutyl ketone. The slurry disclosed by the invention is simple in preparation method, and wide in raw material source; ammonium persulfate is adopted as an oxidant, so that the slurry is good in polishing effect when being prepared into synthetic leather; the obtained synthetic leather is shining and smooth in surface; the mirror surface polishing effect can be achieved; the polished anti-corrosion synthetic leather slurry is green and environmentally friendly; through modification on the groundnut leaves, the viscosity of the groundnut leaves can be improved; manganese dioxide and silicon carbide are added, so that the viscosity of the slurry can be enhanced, and performance stability of the slurry is improved.

The invention discloses a PMSG purifying method. The method comprises the steps of metaphosphoric acid precipitation, ethanol cleaning, caprylic acid precipitation, salting-out precipitation, dialysis desalting, low-concentration ethanol precipitation, high-concentration ethanol precipitation and dialysis cleaning. The addition of the caprylic acid precipitation step allows difficult-precipitation albumins and other macromolecular other proteins to precipitate, the salting-out precipitation step increases the ammonium sulfate adding concentration and avoids the albumin precipitation problem, and the increase of the ammonium sulfate addition concentration improves the precipitation proportions of PMSG active substances and also improves the precipitation proportions of follicle-stimulating hormone (FSH) active substances, so the PMSG purity is increased, and the PMSG recovery rate is also increased.

The invention discloses an environment-friendly flame-retardant impact-resistant polycarbonate composite material and a preparation method thereof. The environment-friendly flame-retardant impact-resistant polycarbonate composite material is prepared from a bisphenol A polycarbonate resin, polyetheretherketone, zinc stearate, magnesium stearate, polytetrafluoroethylene micropowder, aluminum metaphosphate, trichloroethyl phosphate, nano titanium carbide, tributyl citrate, antimony glance powder, hydrated magnesium silicate micropowder, pentaerythritol tetra[beta-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], nano calcium carbonate, attapulgite, graphene, 2,2'-dihydroxy-4,4'-dimethoxy diphenyl ketone, ethylene bis stearamide and the like. The nano calcium carbonate, nano titanium carbide, hydrated magnesium silicate micropowder and the like are sufficiently dispersed in the plastic resin to enhance the weather resistance, mechanical properties and other properties of the material. The antimony glance powder, aluminum metaphosphate, polyetheretherketone, trichloroethyl phosphate and other reinforcing fillers and modifying materials are added to enhance the flame retardancy, impact resistance and other properties of the material.

The invention discloses a monoclonal antibody for kitasamycin residual detection and a preparation method and application thereof. The monoclonal antibody is secreted by a hybridoma KA / 2A9, which is collected by CCTCC (China Center for Type Culture Collection) and has the collection number of C201184. The preparation method comprises the steps of: (A) coupling hapten kitasamycin with bovine serum albumin so as to obtain an immunogen; (B) coupling hapten kitasamycin with ovalbumin so as to obtain a coating antigen; (C) preparing the monoclonal antibody secreted by the hybridoma KA / 2A9 by using the immunogen; (D) coating a solid phase carrier by using the coating antigen; (E) extracting a sample to be detected by using metaphosphoric acid in the presence of ethanol, carrying out back extraction by using ethyl acetate, blow-drying by using nitrogen gas, and diluting the sample so as to obtain a substance to be detected; and (F) carrying out enzyme-linked immunoassay on the substance to be detected. A kit for kitasamycin residual detection comprises an ELISA (Enzyme-Linked Immunosorbent Assay) plate coated by the coating antigen kitasamycin-AOOA-OVA, a kitasamycin standard solution, a goat anti-mouse IgG (Immunoglobulin G) antibody working solution labeled by a horseradish peroxidase, a concentrated phosphate buffer, a concentrated washing solution, a substrate mixture and a stop solution. The method has the characteristics of simplicity, convenience, rapidness, sensitiveness and accuracy.

A polishing composition for use in polishing a substrate for a magnetic disk comprises silicon dioxide; a first compound containing at least one compound selected from the group consisting of orthophosphoric acid, diphosphoric acid, polyphosphoric acid, metaphosphoric acid, methyl acid phosphate, ethyl acid phosphate, ethyl glycol acid phosphate, phytic acid, 1-hydroxyethylidene-1,1-diphosphonic acid, sodium metaphosphate and acidic sodium hexametaphosphate; a second compound containing at least on salt produced by a neutralisation reaction of each of orthophosphoric acid, diphosphoric acid, polyphosphoric acid, metaphosphoric acid, methyl acid phosphate, ethyl acid phosphate, ethyl glycol acid phosphate, phytic acid, 1-hydroxyethylidene-1,1-diphosphonic acid with ammonia hydrogen peroxide; and water. The polishing composition may further contain a polishing accelerator e.g. citric acid, succinic acid. Also shown is a method for polishing a substrate using the above composition.