41 results about "Hydrazine monohydrate" patented technology

Etch assisting agents for focused ion beam (FIB) etching of copper for circuit editing of integrated circuits both prevent loss of adjacent dielectric due to sputtering by the ion beam, and render sputtered re-deposited copper on adjacent surfaces non-conductive to avoid electrical short circuits. The agents are characterized by having an N—N (N being Nitrogen) bonding in their molecules and boiling points between about 70° C. and about 220° C., and include hydrazine and water solutions, hydrazine derivatives, NitrosAmine derivatives saturated with two hydrocarbon groups selected from Methyl, Ethyl, Propyl and Butyl, NitrosAmine related compounds, and Nitrogen Tetroxide. Preferred agents are Hydrazine monohydrate (HMH), HydroxyEthylHydrazine (HEH), CEH, BocMH, BocMEH, NDMA, NDEA, NMEA, NMPA, NEPA, NDPA, NMBA, NEBA, NPYR, NPIP, NMOR and Carmustine, alone or in combination with Nitrogen Tetroxide. The agents are effective for etching copper in high aspect ratio (deep) holes.

The present invention relates to an environmentally benign process for the simultaneous preparation of nanocrystalline anatase titanium dioxide and hydrazine mohydrochloride, in substantial amounts from the acidic aqueous titanium tetrachloride solution by reacting with hydrazine monohydrate at ambient conditions of temperature and pressure. The process of the present invention is simple, easy to operate, pollution free, high in product purity and homogeneous in product particle.

The invention relates to a production method of floor and furniture with low free formaldehyde emission. The formaldehyde removal catalyst consists of urea and its derivatives, amine and its derivatives, ammonium salt, hydrazine hydrate and its derivatives, salt, acid, penetrating agent and Composition of water; based on 100 parts of formaldehyde removal catalyst, the dosage of urea and its derivatives is 10-30 parts, the dosage of amine and its derivatives is 1-15 parts, the dosage of ammonium salt is 3-20 parts, hydrazine hydrate and The amount of its derivatives is 1-9 parts, the amount of salt is 1-15 parts, the amount of acid is 0.01-2 parts, the amount of penetrant is 0.05-7 parts, and the rest is water; even if E2 or FC2, and The wood-based panels with the above free formaldehyde emission can be treated with this method, without changing the production process of the floor and furniture, so that the free formaldehyde emission in the floor or furniture is ≤0.3mg / L, and the formaldehyde concentration in the indoor air meets the national standards. Regulations on indoor air quality standards.

The invention discloses amphipathic chitosan with a chemical crosslinking characteristic and a preparation method thereof. The method comprises the following steps of: reacting chitosan with long-chain aliphatic aldehyde to obtain N-long-chain alkyl chitosan; reacting the N-long-chain alkyl chitosan with phthalic anhydride; reacting an obtained product with iodo-polyethylene glycol monomethyl ether; and performing a deprotection reaction on an amino group by using hydrazine hydrate to obtain N-long-chain alkyl-O-polyglycol chitosan. In a preparation process, the method effectively protects the amino group in a chitosan molecule, avoids introducing a polyglycol group on the amino group, and remains part amino group in the amphipathic chitosan by removing the amino group protection; the product can serve as a precursor for preparing amphipathic chitosan hollow microcapsules; and polyethylene glycol with high biocompatibility, low toxicity and easy degradation is introduced on a hydroxylgroup of the chitosan to serve as a hydrophilic group, so that the research and application values of the derivative on a medicament carrier are improved.

The invention discloses a method for preparing a modified graphene-polyvinyl alcohol composite film. The modifier of the invention is 7-amino-4-methylcoumarin, and the invention is hydrazine hydrate, vitamin C or glucose, etc. Chemical reducing agent; first prepare modified graphene, then prepare the dispersion of modified graphene, then add the dispersion of modified graphene to polyvinyl alcohol aqueous solution to obtain uniformly dispersed modified graphene-polyvinyl alcohol Mixed solution; finally, pour the mixed solution into a container, and dry it at 40-70 degrees Celsius to constant weight in the atmosphere or in a vacuum environment to obtain a modified graphene / polyvinyl alcohol composite film. Wherein, the mass fraction of modified graphene is 0.1%-10%. The invention has the advantages of simple preparation, mild reaction conditions, easy operation and control, and the like.

The invention relates to a nano-silver composite sol and a preparation method thereof. The raw materials of the sol include silver nitrate solution, zinc nitrate solution, ferric nitrate solution, copper nitrate solution, surfactant, hydrazine hydrate and a dispersant. When preparing the composite sol, first mix the silver nitrate solution, zinc nitrate solution, iron nitrate solution, and copper nitrate solution, then add the surfactant solution, and finally add hydrazine hydrate and stir slowly. Drying under high temperature, and finally obtain nanocomposite powder composed of silver, zinc and copper and other components, and then after standing, separating, washing, and redispersing into the solvent to obtain a composite sol with a particle size of 10-100nm, the particle size of the sol is uniform , the raw material is easy to obtain, the process is simple, the cost is low, the industrial production is easy to realize, and the application is very extensive.

The invention provides surface modified particle diameter mixed silver powder and a preparation method thereof. The preparation method comprises the following steps of: adding an alcoholic solution containing 0.3-3.0mol / L of silver nitrate aqueous solution, a pH modifier and an alcohol or ester surface modifier into a reducing solution containing hydrazine monohydrate or ascorbic acid in a parallel flow mode; under a high-shear stirring action, reacting for 20-100min in a stainless steel reaction kettle; regulating reaction temperature to be 20-50DEG C and the pH value to be 1-14 to select a control range; reducing precipitated silver powder in one step; synchronously carrying out surface treatment on silver powder surface, wherein the silver powder is quickly precipitated because the surface of the silver powder is non-hydrophilic, and solid and liquid are extremely easy to separate; washing with deionized water; drying at 50-80DEG C; and smashing and screening to obtain the surface modified silver powder. The preparation method of the silver powder is characterized in that the particle diameter can be adjustably changed between the nanometer / micron scale and the micron / micron scale. The silver powder obtained with the preparation method has the advantages of good silver powder dispersibility, high tap density, good filling property and good affinity solubility with an organic carrier, is extremely easy to disperse in slurry to form silver paste with high solid content, and is especially suitable for pouring in holes and for solar cell silver paste.