1165 results about "Dimethylamines" patented technology

A polyurethane foam assemblage contains an A component and a B component and the A component contains the polyether polyol, the polymer polyol, the crosslinking agent, the catalyst, the stabilizer and the foaming agent; the B component contains the isocyanate; wherein, the catalyst is the mixed catalyst containing the 2-dimethylamine ethanol, the triethylenediamine, the Bis(2-dimethylaminoethyl) ether and the organotin. Compared with the existing high elastic foam, the polyurethane foam assemblage of the invention has lower density, and thus has lower cost and stable formula and simple process on the premise of the same tensile and tear strength. The polyurethane foam assemblage provided by the invention has the advantages of low density, high resilence, cold curing, etc., is in particular suitable for automobile cushion, sofa, mattress, etc.

The present invention relates to foamed cement slurries, additives and methods. A foamed cement slurry of the invention comprises a hydraulic cement, sufficient water to form a slurry, sufficient gas to form a foam and an environmentally benign foaming and stabilizing additive comprising a mixture of an ammonium salt of an alkyl ether sulfate surfactant, a cocoamidopropyl betaine surfactant, a cocoamidopropyl dimethylamine oxide surfactant, sodium chloride and water.

The invention relates to the preparation of silicon fluorine / or oil modified acrylate copolymer cationic emulsion. The emulsion is obtained through the emulsion polymerization in the presence of a cationic surfactant and a nonionic surfactant. The emulsion comprises an acrylic acid alkyl ester and (methyl) acrylic acid alkyl ester, ethylene carbonate, aroma substituted olefin and functional monomers such as N-hydroxyalkyl acrylamide, (methyl) acrylic acid alkyl fluoride ester, ethynyl / acryloyl oxygen ethyl trialkoxy silane or polymerisable acryloyl oxygen alkyl urethane oil, (methyl) acryloyl oxygen ethyl trialkyl ammonium chloride and / or (methyl) acrylic acid dimethylamine group ethyl ester and a crosslinking agent. The cationic emulsion has excellent performance and can be widely applied to paper products, plastics, coating agents for leather and top grade coatings.

The invention discloses a cationic viscoelastic surfactant and preparation and application thereof. The preparation method of the cationic viscoelastic surfactant comprises the following steps: firstly, mixing long-chain fatty acid with dimethylaminopropylamine according to a certain proportion, adding a catalyst solution to obtain a required amide product intermediate A by a series of reaction; allowing reflux condensation reaction of epoxy chloropropane and water at a certain proportion to be carried out in oil bath of 100 DEG C to obtain colourless and transparent 3-chloro-1,2-propylene glycol aqueous solution, namely an intermediate B; heating the intermediate A in oil bath for melting, and dropwise adding an aqueous solution B to obtain the required viscoelastic surfactant by a series of reaction; the surfactant can be mixed with a potassium chloride solution according to a certain proportion to obtain clean fracturing fluid which is low in cost and excellent in performance, besides, the clean fracturing fluid has excellent high-temperature resistance, shearing resistance, and excellent solid-carrying performance, is automatic and thorough in gel breaking, causes little damage to the reservoir stratum and has the characteristic of wide application range.

The invention discloses a combined treatment method of N, N-dimethylformamide (DMF) wastewater, relates to the field of environment protection and water pollution treatment, and in particular relates to a combined treatment method for treating the N, N-DMF wastewater. The method specifically comprises the following steps: firstly decomposing the DMF wastewater into dimethylamine and formate under an alkali condition, then carrying out air stripping, introducing the dimethylamine waste gas generated in the air stripping into a bio-trickling tower for treatment, and directly carrying out biochemical treatment on the air-stripped wastewater. According to the combined treatment method disclosed by the invention, a physic-chemical method and a biological method are combined, a feasible process for treating the DMF wastewater is provided, the toxicity of the DMF wastewater is reduced by means of the physical-chemical method, the biodegradability of the DMF wastewater is improved, and the generated dimethylamine organic waste gas and wastewater are subjected to advanced treatment by means of the bio-chemical method. By adopting the combined treatment method disclosed by the invention, the effective and economical treatment of the DMF wastewater is achieved, and the problems of secondary pollution, difficult regeneration, low efficiency and the like easily caused by the existing treatment methods of adsorption, extraction, chemical oxidization and the like are solved.

The invention discloses a preparation method and an intermediate of minocycline. A preparation method for the intermediate M-M is to subject demethylated aureomycin and dimethylamine to reactions as described in the specification in an amine solvent or amide solvent under the catalysis of a palladium complex. The preparation method for minocycline comprises the following steps: (1) subjecting demethylated aureomycin and dimethylamine to the reactions in the amine solvent or amide solvent under the catalysis of the palladium complex so as to prepare the compound M-M; and (2) subjecting the compound M-M prepared in step (1) to hydrogenation and dehydroxylation in an alcohol solvent including an acid under the catalysis of a catalyst. The preparation method provided by the invention has the advantages of easily available raw materials, low cost, simple two-step reaction operation, high product yield, good product quality, recoverability and reusability of the solvents and easy industrial production.

A method for manufacturing a creped fiber web is provided and includes providing a rotating cylindrical dryer surface, applying an ionene adhesive to the rotating cylindrical dryer surface to form an adhesive dryer surface, conveying a fiber web to the adhesive dryer surface, drying the fiber web on the adhesive dryer surface to form a dried fiber web, and creping the dried fiber web from the adhesive dryer surface. The ionene polymer can be a crosslinked polymer of an alkylamine, a haloepoxyalkane, and an amine that differs from the alkylamine, such as a terpolymer of dimethylamine, epichlorohydrin, and ethylenediamine. The ionene adhesive may further include monoammonium phosphate. The ionene polymer may be water-soluble and cationic.

The present invention relates to compositions for use in refrigeration and air conditioning systems comprising 1,1,1,2,2,4,5,5,5-nonafluoro-4-(trifluoromethyl)-3-pentanone and at least one chlorocarbon, alcohol, ketone, ether, ester, N-(difluoromethyl)-N,N-dimethylamine, 1,1,1,2,2-pentafluoro-2-[(pentafluoroethyl)thio]ethane or mixtures thereof, and which are also useful in systems employing a centrifugal compressor The compositions of the present invention may be azeotropic or near azeotropic and are useful in processes for producing refrigeration or heat or as heat transfer fluids.

The invention discloses a phthalocyanine metal complex as well as a preparation method and an application of the phthalocyanine metal complex. 3-[2,4,6-tri(dimethylamino methyl)-phenoxyl] phthalonitrile is prepared by using 2-phthalonitrile nitryl and 2,4,6-tri(dimethylamino methyl)-phenol as reactants, and further, the phthalocyanine metal complex substituted with amido or amido alpha bit is prepared. The phthalocyanine metal complex has the characteristics of high photosensitive activity and high water solubility; the phthalocyanine metal complex exists in water in a monomer mode, so that the photodynamic activity is facilitated in the water; the phthalocyanine metal complex is subjected to absorption spectroscopic redshift and shifted to a near-infrared area where is beneficial for penetrating through human tissues. The phthalocyanine metal complex is specially high in photodynamic antifungal activity and can be used for preparing photosensitizers or photodynamic medicines or photosensitive medicaments.