45 results about "Bifluoride" patented technology

Traditionally, hydrofluoric acid (HF) or buffered bydrofluoric acid (NH4F) is mixed with water to form a etching solution for cleaning silicon dioxide from semiconductor wafer surfaces. An etching solution formed by mixing ammonium hydrogen bifluoride ((NH4)HF2) with water provides a benign alternative for cleaning silicon dioxide.

A method for producing an etching or cleaning solution comprising (1) at least one member selected from the group consisting of fluoride salts and bifluoride salts formed from at least one member selected from the group consisting of ammonia, hydroxylamines, aliphatic amines, aromatic amines, aliphatic quaternary ammoniums and aromatic quaternary ammoniums with hydrofluoric acid; (2) at least one heteroatom-containing organic solvent; and (3) water, the method comprising the steps of: Step 1: mixing an aqueous hydrofluoric acid solution with at least one heteroatom-containing organic solvent, and Step 2: mixing the mixture obtained in Step 1 with at least one member selected from the group consisting of ammonia, hydroxylamines, aliphatic amines, aromatic amines, aliphatic quaternary ammoniums, aromatic quaternary ammoniums, and fluorides thereof.

Silicon oxide etching solutions containing the product of at least one bifluoride source compound dissolved in a solvent consisting of at least one carboxylic acid, and further comprising from about 0.5 to about 3 percent by solution weight of hydrofluoric acid and from about 1 to about 5 percent by solution weight of water, wherein the total concentration of bifluoride source compound is between about 1.25 and about 5.0 moles per kilogram of solvent. Methods for selectively removing silicon oxides and metal silicates from metal surfaces are also disclosed.

The invention relates to a preparation method of a soluble heat-resistant polymer based on a benzpyrole skeleton. The structural general formula of the polymer is shown in the specification. The preparation method comprises the steps of taking aromatic bifluoride of different structures and 4-oxyindole as monomer and N-methyl pyrrolidone as a solvent, and heating under condition of existence of potassium carbonate so as to obtain soluble heat-resistant polymer of different structures based on the benzpyrole skeleton. The polymer prepared by the method has higher glass transition temperature and thermal decomposition temperature, excellent mechanical property, simple operation processes and lower preparation cost, furthermore, the polymer has good dissolving property and can be dissolved in the N-methyl pyrrolidone, N,N-dimethylformamide, N,N-dimethylacetamide, sulfolane, dimethyl sulfoxide and chloroform.

Silicon oxide etching solutions consisting essentially of the product of at least one bifluoride source compound dissolved in a solvent consisting of about 90% to 100% by weight of at least one carboxylic acid and 0 to about 10% by weight water, wherein the total concentration of bifluoride source compound is between about 1.25 and about 5.0 moles per kilogram of solvent. Methods for selectively removing silicon oxides and metal silicates from metal surfaces are also disclosed.

A method and cleaning composition for removing engine deposits from turbine components, in particular turbine disks and turbine shafts. This method comprises the following steps: (a) providing a turbine component having a surface with engine deposits thereon, wherein the turbine component comprises a nickel and/or cobalt-containing base metal; and (b) treating the surface of the turbine component with a cleaning composition to convert the engine deposits thereon to a removable smut without substantially etching the base metal of the turbine component. The cleaning composition comprises an aqueous solution that is substantially free of acetic acid and comprising: a nitrate ion source in an amount, by weight of the nitrate ion, of from about 470 to about 710 grams/liter; and a bifluoride ion source in an amount, by weight of the bifluoride ion, of from about 0.5 to about 15 grams/liter. The smut that is formed can be removed from the surface of the turbine component in a manner that does not substantially alter the surface thereof.

Processes for preparing fluoroarenes are provided. The processes include contacting a compound having an unactivated aryl group with a source of fluoride or bifluoride in the presence of a transition metal a ligand.

The invention discloses a production method of attapulgite bifluoride toothpaste; the key points of the technical proposal are that: the production method of the attapulgite bifluoride toothpaste includes preparation of materials, low-speed stirring, grinding, high-speed stirring, vacuum degassing and canning into the finished product of the attapulgite bifluoride toothpaste. The attapulgite bifluoride toothpaste is composed of paste attapulgite clay, sodium fluoride, sodium monofluorophosphate, zinc citrate, sodium dodecyl sulfate, titanium white powder, sodium saccharine and deionized water. The attapulgite bifluoride toothpaste can absorb and remove a plurality of offensive smells in the oral cavity, reduce tooth wear, strengthen and regenerate the enamel on the surface of the teeth; the attapulgite bifluoride toothpaste has clean paste body, soft and delicate texture, normal luster and good stability, the paste body is not overflowed to the outside of a pipe mouth, the water is not separated from the invention, the flavor and the luster are normal, and the glass slide has no scratches. The invention is applicable to the production of attapulgite bifluoride toothpaste, Chinese herbal medicine toothpaste and other medicine toothpastes.

The invention relates to manufacturing of glass frosting powder, belongs to the field of light industry, and specifically relates to an anti-dazzle glass frosting powder for windshields. A formula of the glass frosting powder is provided and includes the following ingredients: fluorinated ammonia, ammonium bifluoride, magnesium bifluoride, aluminum bifluoride, oxalic acid, sodium acetate, sodium silicate, ammonium fluoroborate, sodium fluoroborate, Al2O3 and SiO2, sodium dodecyl sulfate, cellulose MCC, sodium hexametaphosphate and sodium polypropionate. The above ingredients are crushed according to a weight ratio; the crushed ingredients are uniformly stirred, dried and packaged; and finally, a product obtained is inspected and enters a finished product warehouse. After car windshields or other types of windshields are treated by the use of the glass frosting powder, the effect of diffuse reflection is good, and external bright light is not irritating to eyes when passing through the treated windshields. Thus, traffic accidents are minimized, and life safety factors of people in cars and safety factors of materials in cars are increased.

The invention relates to a chemical milling liquid for beryllium material surface chemical milling treatment. The chemical milling liquid is characterized by being composed of a class-A chemical milling liquid and a class-B chemical milling liquid, wherein the class-A chemical milling liquid is composed of the following ingredients: 200ml of purified water, 3.6g of sodium nitrate, 12g of ammonia bifluoride and 21.6g of chromium trioxide, and the ratio is the use amount of a single sample per surface area of 13cm<2>; the class-B chemical milling liquid is composed of the following ingredients: 1084ml of phosphoric acid, 100g of chromium trioxide and 60ml of sulphuric acid. According to the chemical milling liquid disclosed by the invention, the surface defects of beryllium materials can be greatly and quantitatively removed and the surfaces are enabled to be bright, beautiful and free from any etch pits by using the prepared chemical milling liquids A and B, and chemically milling according to a certain temperature and etching time. The chemical milling liquid disclosed by the invention is especially suitable for being applied to removal of surface damage layers after machining and brightening treatment of product surfaces, of the beryllium materials produced by a powder metallurgy process.

The invention discloses a method of preparing perfluoro-3-methyl-2-butanone through a reaction of hexafluoropropylene and trifluoroacetyl fluoride under effect of a liquid-phase catalyst which includes a main catalyst, a cocatalyst, an additive and an organic solvent, wherein the main catalyst is selected from metal fluorides and/or metal bifluorides; the cocatalyst is selected from C6-C9 perfluoroolefines; the additive is selected from crown ether and/or crown ether-like compound; the organic solvent is selected from polar aprotic solvents. The preparation method can achieve one-step reaction, is high in reaction speed, and is high in product yield.

A composition of matter for a polymeric material for magnetic coupling through strong hydrogen bonds. A hydrogen bound structural directing entity, such as the bifluoride ion, HF₂⁻, or coordination polymers incorporating strong OH...F type interactions can be used to manufacture organic polymers which allow, via strong hydrogen bonds, the bridging across polymeric magnetic layers to couple spin-polarized electrons to the conduction band, in order to enable control of the electron spin state for spintronic applications.

A method and apparatus for processing a semiconductor substrate are described herein. A process system described herein includes a plasma source and a flow distribution plate. A method described herein includes generating fluorine radicals or ions, delivering the fluorine radicals or ions through one or more plasma blocking screens to a volume defined by the flow distribution plate and one of one or more plasma blocking screens, delivering oxygen and hydrogen to the volume, mixing the oxygen and hydrogen with fluorine radicals or ions to form hydrogen fluoride, flowing hydrogen fluoride through the flow distribution plate, and etching a substrate using bifluoride. The concentration of fluorine radicals or ions on the surface of the substrate is reduced to less than about two percent.

The invention discloses an anti-bacterial and heat-resistant rubber seal ring for instruments and apparatus. The rubber seal ring comprises raw materials in parts by weight as follows: 20-40 parts of brominated butyl rubber, 5-15 parts of bifluoride rubber, 5-15 parts of fluororubber, 1-2 parts of zinc oxide, 0.5-1 part of magnesium oxide, 0.5-1 part of fatty acid, 1 part of sulfur, 5-15 parts of modified diatomite, 5-15 parts of white carbon black, 2-8 parts of fly ash, 1-4 parts of carbon nano tubes, 2-5 parts of bentonite, 1-3 parts of a silane coupling agent KH-540, 0.2-0.6 parts of chlorinated paraffin, 1-2 parts of chloro-methoxy methyl oleate, 0.2-0.6 parts of butyl oleate, 1-2 parts of dioctyl phthalate, 0.1-0.5 parts of diethylene glycol dibenzoate, 1-2 parts of a calcium-zinc composite stabilizer, 1-2 parts of an anti-aging agent H and 1-2 parts of phosphite ester. The rubber seal ring is good in anti-bacterial effect, excellent in mechanical performance, good in toughness and quite good in aging resistance and heat resistance.

The invention discloses a method for reducing ammonium fluorosilicate in ammonium bifluoride. The method comprises the steps as follows: fluorosilicic acid is subjected to an ammoniation reaction anda silicon dioxide-containing ammonium fluoride mixed solution is obtained, wherein the mass concentration of ammonium fluoride is 20%-35%, the mass concentration of silicon dioxide is 2%-15%, and thePH value is 8.0-10; the ammonium fluoride mixed solution in step (1) is filtered by a filter press, most silicon dioxide is removed, a filtrate enters a filtrate tank and left to stand and clarified for 1-3 h, most silicon dioxide settles to the bottom, and the upper layer is a clear ammonium fluoride liquid; the upper clear ammonium fluoride liquid in step (2) is finely filtered again by micropores with the diameter being 3-10 micron, and a wet filter cake returns to a feeding chute of the filter press; a refined filtrate enters a concentrated raw material chute to be left to stand and clarified for 1-3 h, an upper clear ammonium fluoride liquid enters a concentration system, conventional concentration, acid addition, crystallization and centrifugal separation are performed later, and anammonium bifluoride product is obtained. The method can effectively reduce ammonium fluorosilicate in ammonium bifluoride, has low energy consumption, introduces no other impurities and avoids waste emission.

The invention discloses a 3D printing photosensitive material taking green light as a photocuring light source. The 3D printing photosensitive material at least comprises a green light photo-initiation system, the green light photo-initiation system is a Norrish I type photosensitizer and a Norrish II type photosensitizer which have light absorption and initiation capability in a green light wavelength range, and the system comprises a curcumin compound/onium salt system, a boron bifluoride curcumin compound/onium salt system, a ferrocene-contained conjugated indandione compound/onium salt/N-methyl pyrrolidone system, a benzal ketone compound/onium salt system and a benzal ketone compound/amine system. The 3D printing photosensitive material has the beneficial effects that on one hand, through the principles that the longer the wavelength is, the lower the light refractive index is, and the longer the wavelength is, the stronger the light penetrability is, the curing depth of the 3D printing material can be remarkably improved, and the problem of interlayer cracking is avoided, especially for the 3D printing material with the high refractive index, such as 3D printing photosensitive ceramic slurry; and on the other hand, through the principle that the longer the wavelength is, the lower the light refractive index is, the curing width of the 3D printing material can be remarkably reduced, and the curing and printing precision can be improved, especially for the 3D printing material with the high refractive index, such as 3D printing photosensitive ceramic slurry.

The present invention relates to a lawn weedicide and its preparation method. The composition of said lawn weedicide includes (by wt%) 1-50% of alpha-bifluoropropanoic acid, 1-20% of fenchlorazole, 5-10% of synergistic agent and the rest is adjuvant. Its preparation method includes the following steps: synthesizing monofluoride, synthesizing bifluoride, dissolving three kinds of isomer compounds in acetylacetone, separating to obtain alpha-bifluroropropanoic acid solution, mixing alpha-bifluoropropanoic acid, fenchlorazole, bromoxynil and adjuvant, stirring them uniformly so as to obtain the invented weedicide.

The invention discloses a preparation method of flurogestone acetate. The preparation method comprises the following steps: using 9a-cortisone bifluoride as a raw material, dissolving 9a-cortisone bifluoride into an organic solvent, and reacting with acyl chloride under the existence of an acid-binding agent to obtain a 9a-cortisone bifluoride-21-O-ester; then reacting the ester with sodium iodide and a sulfur-containing reducing agent in the organic solvent for deesterification, and synthesizing flugestone; and finally reacting the flugestone with acetylchloride or acetic anhydride in the organic solvent, and synthesizing flurogestone acetate. According to the preparation method, 9a-cortisone bifluoride is used as the raw material, flurogestone acetate is synthesized through three-step reaction of 21-site esterification, then reduction and de-esterification and finally 17-site ethyl esterification, and compared with a traditional synthetic method for using a mold removal object acquired through diosgenin processing as a raw material, the preparation method has the advantages such as wide raw material source, short synthetic route, simple, convenient and environmentally-friendly process, few invested equipment and high product yield, and the production cost in the method is reduced by 25% to 30% as compared with a traditional method; and a solvent used in the production can be recycled and circularly used, and is easy for industrial production.

The invention relates to manufacturing of glass frosting powder, belongs to the field of light industry, and specifically relates to an anti-dazzle glass frosting powder for windshields. A formula of the glass frosting powder is provided and includes the following ingredients: fluorinated ammonia, ammonium bifluoride, magnesium bifluoride, aluminum bifluoride, oxalic acid, sodium acetate, sodium silicate, ammonium fluoroborate, sodium fluoroborate, Al2O3 and SiO2, sodium dodecyl sulfate, cellulose MCC, sodium hexametaphosphate and sodium polypropionate. The above ingredients are crushed according to a weight ratio; the crushed ingredients are uniformly stirred, dried and packaged; and finally, a product obtained is inspected and enters a finished product warehouse. After car windshields or other types of windshields are treated by the use of the glass frosting powder, the effect of diffuse reflection is good, and external bright light is not irritating to eyes when passing through the treated windshields. Thus, traffic accidents are minimized, and life safety factors of people in cars and safety factors of materials in cars are increased.