Patent GB-719671-A (GB)
Title: Improvements in or relating to the manufacture of compositions for the surface treatment of metals
IPC: C11D11/04
Filed: 1952-07-29
Abstract: An aqueous emulsion for the surface treatment, e.g. degreasing of metals is prepared by dispersing in water the urea addition product of one or more water-insoluble organic solvents so that the addition product is decomposed and the organic solvent freed. Suitable organic solvents are hydrocarbons, aliphatic carboxylic acids, alcohols, ketones, esters, and cyclic compounds, e.g. cyclohexane and decahydronaphthalene.  When the organic liquid contains about six carbon atoms per molecule, the molar ratio of urea to organic solvent may be about 4 : 1.  The addition products are formed by heating urea with the solvent; if desired the urea may be melted or dissolved in an alcohol.  Unreacted solvent is removed by filtration or heating, leaving a dry mass.  The emulsion obtained by adding this mass to water may also contain emulsifying or stabilizing agents, e.g. soaps, triethanolamine oleate alkyl aryl sulphonates, fatty alcohol sulphates, polyglycol ethers, albumins, mucilages, cellulose derivatives, and polyacrylic acid.  Other cleaning agents may be included, e.g. caustic alkalis, soda, sodium bisulphate, trisodium phosphate alkali silicates, meta-, pyro-, and poly-phosphates, hydrochloric, sulphuric, amidosulphonic, phosphoric, oxalic, and chromic acids quaternary ammonium salts, and urea salts of phosphoric and nitric acids.  Solid additives may be incorporated with the dry mass before adding to water Metal parts may be treated with the emulsion by dipping, spraying, painting or brushing, or in cleaning machines.  Examples describe the reaction of urea with paraffin oil, dodecyl alcohol, decahydronapthelene, transformer oil, and a hydrocarbon mixture made by reacting hydrogen and carbon monoxide. Emulsions obtained by adding the products to water also contain triethonalamine soaps of alkyl hydroxyacetic acids with 6-9 carbon atoms in the alkyl radical, sodium metasilicate, sulphamides, disulphimides polyglycol ethers of secondary alcohols, and cellulose glycolate.  By including a compound of phosphoric acid and urea, the metals may be cleaned and phosphated in one operation.ALSO:An aqueous emulsion for the surface treatment, e.g. degreasing, of metals is prepared by dispersing in water the urea addition product of one or more water-insoluble organic solvents, so that the addition product is decomposed and the organic solvent freed. Suitable organic solvents are hydrocarbons, aliphatic carboxylic acids, alcohols, ketones, esters and cyclic compounds, e.g. cyclohexane and decahydronapthelene.  When the organic liquid contains about six carbon atoms per molecule, the molar ratio of urea to organic solvent may be about 4 : 1.  The addition products are formed by heating urea with the solvent; if desired the urea may be melted or dissolved in an alcohol.  Unreacted solvent is removed by filtration or heating, leaving a dry mass. The emulsion obtained by adding this mass to water may also contain emulsifying or stabilizing agents, e.g. soaps triethanolamine oleate, alkyl aryl sulphonates, fatty alcohol sulphates, polyglycol ethers, albumins, mucilages, cellulose derivatives, and polyacrylic acid.  Other cleansing agents may be included, e.g. caustic alkalis, soda, sodium bisulphate, trisodium phosphate, alkali silicates, metapyro-, and poly-phosphates, hydrochloric, sulphuric, amidosulphonic, phosphoric, oxalic, and chromic acids, quaternary ammonium salts, and urea salts of phosphoric and nitric acids.  Solid additives may be incorporated with the dry mass before adding to water.  Metal parts may be treated with the emulsion by dipping, spraying, painting, or brushing, or in cleaning machines.  Examples describe the reaction of urea with paraffin oil, dodecyl, alcohol, decahydro-napthelene, transformer oil, and a hydrocarbon mixture made by reacting hydrogen and carbon monoxide.  Emulsions obtained by adding the products to water also contain triethanolamine soaps of alkyl hydroxy-acetic acids with 6-9 carbon atoms in the alkyl radical, sodium meta-silicate, sulphamides, disulphimides, polyglycol ethers of secondary alcohols, and cellulose glycolate.  By including a compound of phosphoric acid and urea, the metals may be cleaned and phosphated in one operation.