30 results about "CFC - Chlorofluorocarbon" patented technology

A bromine-containing solvent, which has been used as an alternative solvent to a chlorofluorocarbon solvent or a chlorine-containing solvent, is characterized in that it is likely to degrade compared with a chlorofluorocarbon solvent or a chlorine-containing solvent. In the conventional bromine-containing cleaner compositions, the degradation of the compositions are prevented by using a corrosion-protecting agent or a stabilizing agent (e.g., nitroethane). However, when the cleaner compositions are used as cleaners for print circuit boards, the reduction in insulation resistance or leak failure is often caused. Thus, provided is a non-flammable cleaner composition comprising a mixture of a bromide selected from n-propylbromide, methylenebromide, bromochloromethane, n-butylbromide, isobutylbromide, sec-butylbromide and ter-butylbromide as a stabilizer for a bromine-containing solvent and an alkene- or alkyne-type hydrocarbon having 4 to 10 carbon atoms.

Disclosed is a combination of hydrofluoroolefins and / or hydrochlorofluoroolefins with stabilizers wherein the stabilizers minimize the degradation of the hydrofluoroolefins and hydrochlorofluoroolefins during storage, handling and use yet allow for atmospheric degradation. The combinations exhibit low or zero ozone depletion potential and lower global warming potential making them of interest as replacements for chlorofluorocarbons and hydrofluorocarbons. The combinations of the present invention comprise hydrofluoroolefins and / or hydrochlorofluoroolefins in combination with a stabilizer or stabilizers selected from free radical scavengers, acid scavengers, oxygen scavengers, polymerization inhibitors and combinations thereof.

A water-blown rigid inorganic hybrid melamine polyurethane foam material and a preparation method therefor, relating to the technical field of production of flame-retardant polyurethane energy-saving materials and building energy conservation. An environmentally-friendly all-water-blown rigid inorganic hybrid melamine polyurethane foam material with B1-grade flame retardation performance according to the present invention is prepared with high-temperature-resistant inorganic hybrid melamine resin polyol or an inorganic hybrid polyol etherified melamine resin, an emulgator, a composite catalyst, a phosphate flame retardant, and a foamer, water or water glass for example, as main raw materials, and by carrying out dispersion by stirring, separately preparing premixed polyether, and then subjecting the premixed polyether to foaming on a sheet making machine, a coating machine, and a casting machine with isocyanate (MDI). The rigid foaming material according to the present invention is free of lower-boiling-point hydrocarbon compound chlorofluorocarbon and hydrochloroflurocarbon compounds, undergoes foaming in virtue of water, and does not destroy the ozone layer nor produce the greenhouse effect, so that the material is environmentally friendly; the flame-retardant property is improved by at least 20%; the material has excellent flame-retardant property while guaranteeing physical properties and has an oxygen index of more than 30%.

The invention belongs to the field of refrigerant, and provides a method for preparing fluorinated alkene by performing dehydrochlorination on chlorofluorocarbon under the action of a catalyst.According to the invention, the novel catalyst is prepared through an impregnation method, reaction of the catalyst and 2-chloro-l, 1, 2-tetrafluoro propane (HCFC-244bb) with lower purity is performed, and then high-temperature gas phase dehydrochlorination reaction is performed to prepare a fluorinated alkene product 2, 3, 3, 3-tetrafluoro propene. Through the adoption of the novel catalyst, the purity requirement on chlorofluoropropane is reduced, so that HCFC-244bb with the purity of 80 percent can be as a raw material, thereby effectively reducing the operating cost of the process; the halohydrocarbon conversion rate is high, and reach up to 60 percent, and the selectivity of the target fluorinated alkene is greater than 90 percent.