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32 results about "Acid erosion" patented technology
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Acid erosion is a type of tooth wear. It is defined as the irreversible loss of tooth structure due to chemical dissolution by acids not of bacterial origin. Dental erosion is the most common chronic disease of children ages 5–17, although it is only relatively recently that it has been recognised as a dental health problem. There is generally widespread ignorance of the damaging effects of acid erosion; this is particularly the case with erosion due to fruit juices, because they tend to be seen as healthy. Acid erosion begins initially in the enamel, causing it to become thin, and can progress into dentin, giving the tooth a dull yellow appearance and leading to dentin hypersensitivity.
Load and environment synchronous coupling simulation testing system and method
InactiveCN103776683AFacilitate damage and deterioration mechanismFacilitate the research of prevention technologyWeather/light/corrosion resistanceStrength propertiesTest chamberEngineering
The invention discloses a load and environment synchronous coupling simulation testing system and method, and belongs to an environment test chamber and loading device integrated system and method. The load and environment synchronous coupling simulation testing system consists of two parts including a loading device and an environment simulation device, wherein the loading device consists of three parts including a counter-force frame, a hydraulic jack or actuator and a dowel bar; the environment simulation device consists of two parts including a control table and a chamber body; the chamber body internally comprises a temperature system, a salt mist system, a spraying system, an illumination system, a gas injection system, a humidity monitoring system and the like. The load and environment synchronous coupling simulation testing system can achieve the simulation environments of multiple tests including salt mist, salt rain, getting wet in the rain, high-low temperatures, humidity, ultraviolet lamp illumination, acid gases and the like, can develop the structure damage degradation performance test in multiple factors of dry and wet alternation, cycle of freezing and thawing, corrosive gas pickling, corrosive liquid erosion, namely acid erosion, alkaline erosion and salt erosion solutions under a single effect or synchronous coupling effects, realizes synchronous coupling of environment simulation and load simulation, and can truly reflect the actual operation situation of a structure.
Owner:CHINA UNIV OF MINING & TECH
Method for cleaning waste silicon material generated in silicon wafer treatment process
InactiveCN102694074ANo lossEfficient removalFinal product manufactureSemiconductor devicesAcid erosionImpurity
The invention discloses a method for cleaning a waste silicon material generated in a silicon wafer treatment process, which comprises the following steps: 1) soaking the waste silicon material to be washed in a mixed acid liquid, and rinsing with pure water; 2) soaking the waste silicon material subjected to mixed acid liquid soaking in an alkali liquid, and rinsing with pure water; and 3) soaking the waste silicon material in a hydrochloric acid solution, rinsing with pure water, and drying, wherein the mixed acid liquid is the waste acid liquid generated in the battery preparation process. According to the technical scheme, the invention can effectively and thoroughly eliminate the surface and embedded impurities of the waste silicon material without causing silicon material loss; and since most impurities are removed by acid erosion or alkali erosion instead of manual sanding, the work efficiency is enhanced. Besides, the mixed acid liquid is the waste acid liquid in the battery preparation process, thereby saving the cost and making contributions to wastewater treatment, emission reduction and consumption reduction.
Owner:保定晶创硅材料制造有限公司
Forming method for solar energy cell substrate suede structure
InactiveCN1933188AShorten manufacturing process timeReduce manufacturing costFinal product manufactureSemiconductor/solid-state device manufacturingRough surfaceAcid erosion
This invention relates to a method for forming flannel surface structure on the positive of a solar energy cell including: 1, blasting the positive of a silicon chip with SiC sand to remove some films such as SiN, TiN and SiC films on the positive of the silicon chip to expose bug Si layer, and rough surface is formed on the positive of the Si chip with the roughness greater than 0.3 mum and the back keeps smooth, 2, dipping the Si chip with rough surface at the positive into an acid erosion solution, the chip processed by acid has rough surface and the back becomes smooth, 3, cleaning.
Owner:SEMICON MFG INT (SHANGHAI) CORP +1
Method for obtaining micro-nano SiO2 particle containing coating on surface of aluminium and aluminium alloy
ActiveCN102899644ASolve the hardnessSolve wear resistanceLiquid/solution decomposition chemical coatingMicro nanoChemical plating
A method for obtaining a micro-nano SiO2 particle containing coating on a surface of aluminium and aluminium alloy. Samples are firstly subjected to alcohol immersing, chemical removing for oil and alkali, acid erosion, water washing and zinc dipping, and finally pre-treated by acetone and alcohol ultrasonic cleaning; SiO2 nanometer particles are placed in a non-ionic surface active agent OP-21 to immerse; and then the samples are subjected to composite chemical plating and washed by cold water to obtain the finished product. The method is reasonable in technology and easy to operate, can produce the coating just by using equipment of traditional nickel-phosphorous chemical plating technology, and has relatively good economic benefit and popularization prospect. The obtained coating is compact and firm, and has advantages of good combinability, uniform surface, high hardness, wear resistance, heat resistance and high comprehensive properties; and hardness and wear resistance of the obtained coating are all higher than that of single nickel-phosphorus coatings. The active agent is nontoxic, environmentally-friendly, highly-efficient, simple in formula, easy to operate and low in cost.
Owner:柳州一阳科技股份有限公司
Acid fracturing method of multiple acid injecting systems at deep carbonate rock formation
InactiveCN110630239ARealize variable viscosity and variable displacement injectionEnhance non-uniform etch degreeFluid removalAcid erosionAcid fracturing
The invention discloses an acid fracturing method of multiple acid injecting systems at deep carbonate rock formation. The acid fracturing method comprises the following steps of (1), evaluation of key reservoir parameters, (2) horizontal borehole trajectory determination, (3) determination of well completion mode and pressure separation mode, (4) oil and gas reservoir geological model establishment and production history fitting, (5) optimization of crack parameter systems, (6) optimization of acid pressure construction parameters, (7) different-viscosity acid-liquid independent injecting system design and connection with acid fracturing process, (8) high-viscosity fracturing fluid seam-making construction, (9) simultaneous injecting construction of different-viscosity acid liquid, (10) closed acid variable displacement injecting construction, and (11) replacement operation. By means of the acid fracturing method, the non-uniform etching degree of the inner wall of the crack can be improved, and the acid erosion crack conductivity of the deep carbonate rock formation under the high ground stress condition is improved, so that the effective cycle of the crack of the increase production by acid fracturing is prolonged, and the efficiency of economic development is improved accordingly.
Owner:CHINA PETROLEUM & CHEM CORP +1
High-temperature-resistant gelling agent in acid liquid and method for preparing high-temperature-resistant gelling agent
The invention discloses a high-temperature-resistant gelling agent in acid liquid and a method for preparing the high-temperature-resistant gelling agent. Acrylamide monomers, acryloyloxyethyl trimethyl ammonium chloride monomers and third monomers are polymerized to obtain the high-temperature-resistant gelling agent. The method includes adding azo initiators, chain transfer agents, oxidation and reduction initiators and iron ion complexing agents during polymerization reaction to obtain reaction products; granulating and drying the reaction products to obtain the high-temperature-resistant gelling agent. The high-temperature-resistant gelling agent in the acid liquid and the method have the advantages that the high-temperature-resistant gelling agent is easy to synthesize, gelling acid liquid systems are stable in performance, easy to prepare and convenient to construct, can be applied to high-temperature carbonate rock acidizing construction, are high-temperature-resistant and salt-resistant and are excellent in retardance, filtration reduction, fracture forming and resistance decrease performance, secondary damage can be alleviated, the flow guide capacity of acid erosion fracture can be effectively improved, penetration distances of acid can be effectively extended, and the deep acidizing purpose can be achieved.
Owner:CNPC BOHAI DRILLING ENG
Implant active surface
InactiveCN108144111AGood biocompatibilityImprove bindingSurface reaction electrolytic coatingPharmaceutical delivery mechanismMicro arc oxidationBiocompatibility Testing
The invention discloses an implant active surface. The surface of an implant is provided with a titanium-based bottom layer, the outer surface of the titanium-based bottom layer is coated with a titanium dioxide layer comprising calcium and phosphorus, the outer surface of the titanium dioxide layer comprising the calcium and phosphorus is coated with a polyelectrolyte layer, the polyelectrolyte layer consists of polylysine with positive charges and hyaluronic acid with negative charges, and the polyelectrolyte layer is loaded with silver to obtain a silver-loading polyelectrolyte layer. By virtue of a treatment method combining acid erosion treatment, micro arc oxidation treatment and alkaline heat treatment, the implant surface has good biocompatibility, the surface free energy is increased, and the surface coarseness is increased, so that cells can be better combined with the implant, and certain bone induction capacity can be achieved; and by utilizing a layer-to-layer self-assembling technology, the polyelectrolyte with the charge characteristic and inorganic particles are introduced into the surface of the implant to establish the silver-loading polyelectrolyte layer, and byvirtue of the synergistic bacteriostatic effect of the polylysine and the silver, the implant surface has good antibacterial performance.
Owner:DALIAN SANSHENG SCI & TECH DEV
Composite structure ceramic proppant and preparation method thereof
ActiveCN107057676AEfficient use ofRich sourcesFluid removalDrilling compositionFiberCeramic composite
The invention discloses a composite structure ceramic proppant and a preparation method thereof and belongs to the technical field of ceramic composite materials prepared from industrial wastes. The composite structure ceramic proppant comprises the following components in percentage by weight: 50-80% of steel slag, 3-20% of coal ash, 2-30% of kyanite micro-powder, 3-10% of silica powder, 2.5-20% of clay and 0.2-2% of carboxymethylcellulose. The preparation method comprises the process steps of preparing powder, burdening, balling, drying, firing, naturally polishing and carrying out surface treatment. The steel-making slag is taken as a main raw material and industrial solid wastes are effectively utilized, so that the prepared product has a crystallite-fiber composite structure, has relatively high mechanical strength, a smooth surface and acid erosion resistance, can be widely applied to the technical fields of an oil and gas drilling proppant, a concrete aggregate and a plastic filler.
Owner:武汉钢铁有限公司
Efficient refractory castable for medical waste incinerator and preparation and construction technology thereof
InactiveCN105565833AHigh temperature resistantImprove thermal shock resistanceCombustion chamberManufacturing technology
The invention discloses an efficient refractory castable for a medical waste incinerator and a preparation and construction technology thereof, belongs to the field of refractory materials, and particularly relates to a preparation method of the efficient refractory castable for the medical waste incinerator. Compared with traditional lining material of an incinerator, the efficient refractory castable for the medical waste incinerator disclosed by the invention has the advantages of high-temperature resistance, high thermal shock resistance, high strength, high wear resistance and resistance against alkaline and acid erosion; and moreover, special-shape structures in two combustion chambers can meet the working condition requirements to finish complete decomposition of dioxin by the incinerator. The technical scheme of preparation comprises the following steps: mixing A-85 high-bauxite clinker with brown fused alumina, CA-80 aluminate cement, silicon dioxide micro-powder, calcined alumina micro-powder and additives A, B and C; and adding a little water and mixing to obtain the efficient refractory castable.
Owner:SHANDONG YAOHUA REFRACTORY MATERIAL SCI & TECH CO LTD
Oral care compositions and methods for the same
ActiveUS11154487B2Inhibition formationAvoid erosionCosmetic preparationsToilet preparationsAcid erosionMouth care
A film forming composition and methods for preventing acid erosion of teeth and preventing the formation of caries on teeth are disclosed. The film forming composition may include a hydrophobic copolymer, a fluoride compound, and an orally acceptable solvent. The film forming composition may also include a cellulose derivative, a rosin, a fluoride compound, and an orally acceptable solvent.
Owner:COLGATE PALMOLIVE CO
Method for preparing filtering material for removing acidic gas in air
ActiveCN101564682ALarge specific surface areaPrevent acid corrosionOther chemical processesAluminium hydroxideRotary furnace
The invention provides a method for preparing filtering material for removing acidic gas in air, which includes steps of preparing potassium permanganate solution; granulating: after crushing, raw material aluminum hydroxide (with granularity of 7-15 microns) is treated by flash-roasting to prepare aluminum oxide powder, the aluminum oxide powder is put into a ball forming mill and added with the potassium permanganate solution to prepare balls, the size of the ball is controlled to about 3-5mm; hydrating: the prepared balls is hydrated by steam with temperature of 95-100DEG C for 6-8 hours; and baking finished product: hydrated filtering material is conveyed into an electro-thermal rotary furnace for activated baking to obtain the finished material. The invention has advantages that effective adsorption capability of the filtering material prepared by the method is 16% to HS, adsorption specific surface area of aluminum oxide is increased, and purification efficiency is improved. The material can be applied for air purifying device, so that the air purifying device can be widely applied for instrument chamber of petrochemistry industry, paper making industry and metallurgy industry, thereby effectively avoiding acid erosion of HS to instruments.
Owner:AIKANG AIR PROCESSING SYST BEIJING
Method for electroplating copper-graphite composite material on surface of TC4 titanium alloy
InactiveCN109371440AImprove bindingImprove wear resistanceElectrolytic coatingsElectrolysisCopper plating
The invention belongs to the technical field of titanium alloy surface electroplating, in particular to a method for electroplating a copper-graphite composite material on the surface of a TC4 titanium alloy. The method aims at solving the problem that the abrasion resistance of a plating layer formed by plating copper on the surface of a titanium alloy is poor. The method for electroplating the copper-graphite composite material on the surface of the TC4 titanium alloy comprises the following steps that a, graphite powder is scorched, nitric acid is added for coarsening, a copper sulfate solution and a sulfuric acid solution are mixed to form an electroplating solution, and graphite is added into the electroplating solution; b, degreasing treatment is carried out on the surface of the TC4titanium alloy, and then acid erosion activation is carried out; and c, the electroplating solution is added into an electrolytic tank, the titanium alloy obtained in the step b is assembled by usinga metal molybdenum wire into a cathode, a copper plate is an anode, the electroplating solution is stirred, electrolysis is carried out for 10-60 minutes at normal temperature, and then the copper-graphite composite material is obtained on the surface of the titanium alloy through electroplating. According to the electroplating method, the operation is simple, a copper-graphite composite platinglayer can be obtained through electroplating, the abrasion resistance of the plating layer is better, and the value of the plating layer is higher.
Owner:CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
Tooth desensitization paste components and preparation method
InactiveCN111671869AHeat-clearing and detoxifyingHas pain reliefInorganic phosphorous active ingredientsDigestive systemGlycerolSorbitan
The invention provides tooth desensitization paste components and a preparation method, and relates to paste for treating delay sensitivity symptoms and a preparation method of the paste. The paste comprises compound galanga extractum, carboxymethyl cellulose sodium, polyoxyethylene sorbitan monoleate, glycerine, monosodium phosphate, calcium carbonate, a chlorophyll 3% aqueous solution, ethylparaben, D-sodium isoascorbiate, saccharin sodium and purified water. The tooth desensitization paste components adopt traditional Chinese medicine compatibility, have the effects of removing dirt with spices, clearing heat, removing toxicity, relieving a pain and reducing the swelling, are mild in medicinal temperament, and small in side effects, and can solve the tooth allergy fundamentally. In addition, one reason for the tooth allergy lies in that foods etch dental enamels to enable a protecting cover of a tooth to be damaged. The tooth desensitization paste components comprise calcium hydrogen phosphate and calcium carbonate, so that on one hand, the tooth desensitization paste components can be used as a pH buffering agent to neutralize acidity of the oral cavity and reduce damage to theprotecting cover, and on the other hand, natural components forming dental enamels, such as Ca and P can be released, so as to repair the protecting cover and protect the tooth at the same time.
Owner:NANJING BAIJINGYU PHARMA
Oral Care Compositions and Methods for the Same
ActiveUS20200113805A1Preventing acid erosionInhibition formationCosmetic preparationsToilet preparationsAcid erosionMouth care
A film forming composition and methods for preventing acid erosion of teeth and preventing the formation of caries on teeth are disclosed. The film forming composition may include a hydrophobic copolymer, a fluoride compound, and an orally acceptable solvent. The film forming composition may also include a cellulose derivative, a rosin, a fluoride compound, and an orally acceptable solvent.
Owner:COLGATE PALMOLIVE CO
Polyethylene weathering-resistant color master batch material
Polyethylene (PE) is one of five synthetic resins. Polyethylene is mainly divided into three categories such as linear low density polyethylene (LLDPE), low density polyethylene (LDPE), and high density polyethylene (HDPE), has characteristics of no odor, no toxicity, wax-like handfeeling, excellent low-temperature resistance (the lowest use temperature is -70 to -100 DEG C), good chemical stability and resistance to most of acid erosions and alkali erosions (intolerance to acids having oxidation property), is insoluble in general solvents at a room temperature, has low water absorption, has excellent electrical insulation performance, is sensitive to environmental stress (chemical and mechanical actions) and has poor heat aging resistance, such that the disadvantages of polyethylene is changed by modification. The present invention provides a polyethylene weathering-resistant color master batch material and a preparation method thereof.
Owner:QINGDAO XINHEYI IND & TRADE CO LTD
Oral care composition containing bioactive material and spherical silicon dioxide
PendingCN112618392AReduce sensitivityReduce wearCosmetic preparationsToilet preparationsMouth careEngineering
The invention relates to an oral care composition containing a bioactive material and spherical silicon dioxide. The oral care composition comprises the bioactive material, fluoride and the spherical silicon dioxide, wherein the D50 median particle size of the spherical silicon dioxide is 3.5-4 microns, the D95 particle size is smaller than 8 microns, the oil absorption value is smaller than 100cc / 100g, and the sphericity coefficient is not smaller than 0.9. The particle size of the spherical silicon dioxide particles is equivalent to the pipe diameter of a dental tubule, and the particles are relatively complete spheres, so that the composition can be used for blocking the dental tubule when used as an oral care product, and the sensitivity of teeth is reduced. In addition, the spherical silicon dioxide can also be used as an abrasive and has relatively high cleaning power, and the particles are spherical, so that the wear to enamel can be reduced. Due to compounding of the three substances, remineralization and acid erosion resistance of the enamel dentin can be effectively promoted, and the problems of decayed teeth and tooth sensitivity are improved.
Owner:广州舒客实业有限公司
Method of improving reliability of flash memory
InactiveCN1237608CImprove random bit glitchesSimple processSemiconductor/solid-state device manufacturingAcid erosionDielectric layer
The method of improving the reliability of flash memory includes the following steps: forming one stacked layer on one substrate including one first polysilicon layer and one sacrificial layer on the polysilicon layer, forming high temperature oxide (HTO) film to cover the stacked layer, depositing one dielectric layer on the HTO film, wet etching the dielectric layer and the HTO film to expose the sacrificial layer, eliminating the sacrificial layer completely and at least one pickling, soaking and cleaning process. The HTO film can strengthen the interface between the dielectric layer and the first polysilicon layer to avoid acid erosion cracking during the pickling, soaking and cleaning process.
Owner:MACRONIX INT CO LTD
Back coating composition and mirror
InactiveCN102597141ANot easy to corrodeImprove acid resistanceMirrorsAnti-corrosive paintsAcid erosionTectorial membrane
Disclosed is a back coating composition capable of forming a back coating film which is not susceptible to acid erosion, and also disclosed is a mirror having excellent acid resistance. A back coating film (14) is formed on a metal film (a silver mirror film (12) or a metal protective film (13)) of a mirror (10) using a back coating composition containing a thermosetting resin, a pigment, and a dispersant, wherein an amino group-containing polymer which has an amine value of 20 mg KOH / g or more and does not have an acid group is contained as the dispersant.
Owner:ASAHI GLASS CO LTD
Method for obtaining micro-nano SiO2 particle containing coating on surface of aluminium and aluminium alloy
ActiveCN102899644BReasonable workmanshipSimple and fast operationLiquid/solution decomposition chemical coatingMicro nanoChemical plating
A method for obtaining a micro-nano SiO2 particle containing coating on a surface of aluminium and aluminium alloy. Samples are firstly subjected to alcohol immersing, chemical removing for oil and alkali, acid erosion, water washing and zinc dipping, and finally pre-treated by acetone and alcohol ultrasonic cleaning; SiO2 nanometer particles are placed in a non-ionic surface active agent OP-21 to immerse; and then the samples are subjected to composite chemical plating and washed by cold water to obtain the finished product. The method is reasonable in technology and easy to operate, can produce the coating just by using equipment of traditional nickel-phosphorous chemical plating technology, and has relatively good economic benefit and popularization prospect. The obtained coating is compact and firm, and has advantages of good combinability, uniform surface, high hardness, wear resistance, heat resistance and high comprehensive properties; and hardness and wear resistance of the obtained coating are all higher than that of single nickel-phosphorus coatings. The active agent is nontoxic, environmentally-friendly, highly-efficient, simple in formula, easy to operate and low in cost.
Owner:柳州一阳科技股份有限公司
Oral care composition for resisting dental acid erosion
PendingCN110393680AImprove the problem of re-exposure and re-sensitization of teethImprove re-sensitive issuesCosmetic preparationsToilet preparationsAcid erosionDentistry
The present invention discloses an oral care composition for resisting dental acid erosion. The oral care composition comprises hydroxyapatite and an officinal magnolia bark extract, wherein a weightratio of the hydroxyapatite is larger than or equal to 1.0%, and the officinal magnolia bark extract accounts for 0.1-1.0% of the total weight. The hydroxyapatite and officinal magnolia bark extract of the oral care composition have a synergistic effect and can form a remineralizing layer on surfaces of teeth, the newly formed remineralizing layer has capacity of resisting the acid erosion, so that the oral care composition can effectively solves problems of demineralization of the remineralizing layer or tooth tubule re-exposure and tooth re-sensitivity.
Owner:HAWLEY & HAZEL BVI
Orthodontic device and method for orthodontics
The invention discloses an orthodontic device and a method for orthodontics, comprising the following steps: taking a dental film to obtain the tooth condition, customizing an orthodontic plan according to the tooth condition, taking a model to obtain the shape of the patient's tooth surface, establishing an occlusal surface and a tooth model by a computer, and determining Orthodontic aids, cleaning the tooth surface, determining the bonding position of the brackets, fixing the brackets, setting the arch wire, and setting the orthodontic aids; efficiently and intuitively making brackets and arches corresponding to the patient's tooth condition through prototypes and computers Silk and orthodontic auxiliary devices, clean the tooth surface, and at the same time carry out slight acid etching cleaning treatment on the bonding position of the tooth surface, so as to improve the roughness of the tooth surface, facilitate the fixing of the bracket, and cushion the tooth surface to prevent the process of fixing the bracket In the case of excessive adhesive attachment area or fixed skew, the archwire is placed on the patient's tooth surface through the bracket to restrain and fasten the teeth to be treated. Carry out corresponding personalized assistance and applications.
Owner:北京联袂义齿技术有限公司
Anti-corrosive oil-resisting cable and its preparation method
InactiveCN107778653AGood oil resistance and corrosion resistancePlastic/resin/waxes insulatorsAcid erosionNano zinc oxide
The invention discloses an anti-corrosive oil-resisting cable and its preparation method. The preparation method includes steps of 1), placing silicon dioxide in acid fluid to mix, and preparing the silicon dioxide after acid erosion; 2), mixing and filtering the silicon dioxide after acid erosion with nano-zinc oxide in the presence of solvent, and preparing a mixture M1; 3), mixing and melting polypropylene resin, the mixture M1, polyurethane resin, mica powder, magnesium oxide, curing agent and accelerant, and then extruding and shaping; preparing a cable skin; 4), coating a cable core by the cable skin, and preparing the anti-corrosive oil-resisting cable. Through the methods of placing silicon dioxide in acid fluid to mix, mixing and filtering the silicon dioxide, and then mixing andmelting polypropylene resin, the mixture M1, polyurethane resin, mica powder, magnesium oxide, curing agent and accelerant, and then extruding and shaping to prepare the cable skin, and coating the cable core by the cable skin, the cable has good oil-resisting and anti-corrosive performances.
Owner:WUHU HANGTIAN SPECIAL CABLE FACTORY
Method for recovering rare earth elements from a solid mixture containing a halophosphate and a compound of one or more rare earth elements
InactiveCN102395529BRare earth metal oxides/hydroxidesRare earth metal chloridesAcid erosionRare-earth element
Owner:RHODIA OPERATIONS SAS
Oral Care Compositions and Methods for the Same
InactiveUS20220008315A1Inhibition formationAvoid erosionCosmetic preparationsToilet preparationsAcid erosionMouth care
A film forming composition and methods for preventing acid erosion of teeth and preventing the formation of caries on teeth are disclosed. The film forming composition may include a hydrophobic copolymer, a fluoride compound, and an orally acceptable solvent. The film forming composition may also include a cellulose derivative, a rosin, a fluoride compound, and an orally acceptable solvent.
Owner:COLGATE PALMOLIVE CO
Medicinal composition for preventing and treating dental caries and preparation method and application of medicinal composition
The invention provides a medicinal composition for preventing and treating dental caries. The medicinal composition is gel made of chitosan, beta-sodium glycero-phosphate and sodium fluoride as main components. The invention further provides a preparation method of the gel. The preparation method comprises the following steps: 1) dissolving chitosan into a 0.05mol / L medicinal composition hydrochloric acid solution so as to obtain a saturated chitosan-hydrochloric acid solution, performing high-temperature sterilization, and cooling to a normal temperature for later use; 2) preparing a 56%w / v beta-sodium glycero-phosphate solution from deionized water; 3) putting sodium fluoride into the saturated chitosan-hydrochloric acid solution prepared in the step 1), dropping the beta-sodium glycero-phosphate solution prepared in the step 2), and uniformly stirring in an icy water bath, so as to obtain chitosan-sodium fluoride gel. The medicinal composition for preventing and treating dental caries, which is provided by the invention, is relatively low in cost when being compared with duraphat, in addition, tests show that acid erosion of teeth can be effectively inhibited, and remineralization of dental caries can be promoted, in addition, the composition is simple to preserve and convenient to use, and applicable to wide clinical popularization and application.
Owner:AFFILIATED STOMATOLOGICAL HOSPITAL OF NANJING MEDICAL UNIV
Method for cleaning waste silicon material generated in silicon wafer treatment process
InactiveCN102694074BNo lossEfficient removalFinal product manufactureSemiconductor devicesAcid erosionImpurity
The invention discloses a method for cleaning a waste silicon material generated in a silicon wafer treatment process, which comprises the following steps: 1) soaking the waste silicon material to be washed in a mixed acid liquid, and rinsing with pure water; 2) soaking the waste silicon material subjected to mixed acid liquid soaking in an alkali liquid, and rinsing with pure water; and 3) soaking the waste silicon material in a hydrochloric acid solution, rinsing with pure water, and drying, wherein the mixed acid liquid is the waste acid liquid generated in the battery preparation process. According to the technical scheme, the invention can effectively and thoroughly eliminate the surface and embedded impurities of the waste silicon material without causing silicon material loss; and since most impurities are removed by acid erosion or alkali erosion instead of manual sanding, the work efficiency is enhanced. Besides, the mixed acid liquid is the waste acid liquid in the battery preparation process, thereby saving the cost and making contributions to wastewater treatment, emission reduction and consumption reduction.
Owner:保定晶创硅材料制造有限公司
Acid resistant prefabricated component for carbonization furnace
InactiveCN104829247AMeet the conditions of useGood resistance to high temperature acid corrosionPerformance requirementAcid erosion
The invention provides an acid resistant prefabricated component for a carbonization furnace, aims to solve the problem of severe erosion of the flue gas generated in the pyrolysis charing process on the inner liner of the carbonization furnace. The acid resistant prefabricated component comprise, by weight, 10-20 parts of 5-8mm mullite, 10-15 parts of 3-5mm of flint clay, 10-15 parts of 1-3mm flint clay, 5-10 parts of 0-1mm of flint clay, 10-25 parts of 0.2-1mm alumina hollow ball, 8-15 parts of silicon carbide powder no more than 200 mesh, 5-10 parts of flint clay powder no more than 200 mesh, 3-5 parts of calcium aluminate cement, 3-5 parts of alumina powder, 4-6 parts of silicon powder, 0.10-0.15 part of a water reducing agent and 0.01-0.02 part of explosion-proof fibers. The acid resistant prefabricated component for carbonization furnace prepared by the invention has good high-temperature acid erosion resistance, suitable strength, low thermal conductivity and excellent thermal shock resistance, can withstand the erosion of strong acidic gases produced in the pyrolysis carbonization process such as nitrogen oxides, sulfur oxides, hydrogen chloride and partial hydrogen fluoride, takes into account of the performance requirements of product strength and thermal conductivity, and can significantly prolong the service life of the carbonization furnace.
Owner:ZHEJIANG KINGCRED NEW MATERIAL CO LTD
Making process of image-transmitting soft fiber tow
InactiveCN1487311ASolve high temperature resistanceOvercoming difficult manufacturing problemsBundled fibre light guideAcid erosionSoluble glass
The making process of image-transmitting soft fiber tow includes acid dissolving to arrange single fiber material into composite fiber rod, drawing into filament, protecting two ends with acid resisting rubber, acid eroding un-fused soluble glass in the surface of the composite fiber filament in the middle part, adding middle outer protecting casing and adding protecting metal caps in two ends. It features the local high temperature fusion of the two ends of composite fiber rod to form cones before acid erosion. The present invention has the advantages of maintaining the merits of acid dissolving method, capacity of making large cross section area image transmitting fiber tow, greatly raised resolution and light transmittance and less filament breakdown. The method of the present invention may be used also in making light-transmitting fiber tow.
Owner:崔开源
Method for preparing filtering material for removing acidic gas in air
ActiveCN101564682BLarge specific surface areaPrevent acid corrosionOther chemical processesAluminium hydroxideRotary furnace
Owner:AIKANG AIR PROCESSING SYST BEIJING
Method of improving reliability of flash memory
InactiveCN1453851AImprove random bit glitchesAvoid acid-corroded seam phenomenaSemiconductor/solid-state device manufacturingAcid erosionEngineering
The method of improving the reliability of flash memory includes the following steps: forming one stacked layer on one substrate including one first polysilicon layer and one sacrificial layer on thepolysilicon layer, forming high temperature oxide (HTO) film to cover the stacked layer, depositing one dielectric layer on the HTO film, wet etching the dielectric layer and the HTO film to expose the sacrificial layer, eliminating the sacrificial layer completely and at least one pickling, soaking and cleaning process. The HTO film can strengthen the interface between the dielectric layer and the first polysilicon layer to avoid acid erosion cracking during the pickling, soaking and cleaning process.
Owner:MACRONIX INT CO LTD
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