31 results about "Acid erosion" patented technology

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.

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.

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.

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.

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.

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.

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.

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.

The present invention relates to a method for recovering rare earth elements from a solid mixture containing a halophosphate and at least one or more rare earth element compounds, comprising the steps of: (a) attacking the mixture with an acid; (b) adding a base such that the pH is raised back to at least 1.5; (c) attacking the solid of step (b) with a solution of caustic soda or caustic potash; (d) acid attacking the solid of step (c) until a pH below 7 is obtained, thereby producing a solid phase and a liquid phase comprising at least one rare earth salt, and separating the solid phase from the liquid phase.

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.

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.

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.

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 thepotassium 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. Thematerial 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.

The invention provides a method for making a dental mold guide plate, comprising: S1, acquiring three-dimensional image data of a patient's oral cavity, generating a virtual oral cavity model S2 according to the three-dimensional data of the patient's oral cavity, and generating a virtual dental mold guide plate model on the virtual oral cavity model; S3, According to the correction data, a window is set in the virtual dental template model to obtain a virtual dental template model with a window; S4, output the three-dimensional image data of the virtual dental template model with a window; S5, according to The three-dimensional image data of the virtual dental template model with the window is used to make the dental template with the window. The beneficial effects of the present invention are: to provide a dental model guide plate designed by digitally simulating the effect after correction, and then treat the patient accordingly through the dental model guide plate made, which reduces the number of repeated confirmations between doctors and patients, and improves It improves the doctor's treatment efficiency, guarantees the treatment effect, and improves the patient's treatment experience.