use of bis - benztriazolen as korrosionshemmendes and metalldeaktivierendes resources

摘要

Antifreeze, synthetic lubricants, cutting oils and coolant formulations which are used in contact with metal surfaces and are susceptible to deterioration on such contact, contain, as a metal deactivator, a compound of the formula FORM:1081282/C4-C5/1 wherein X represents a direct link, a C1- 6 straight chain alkylene radical optionally substituted by one or more C1- 4 alkyl groups; a 1,1-cyclohexyl radical; a carbonyl radical; a sulphuryl radical; an oxygen atom or a sulphur atom. Abrasive compositions for application to a metal surface contain as a tarnish or corrosion inhibitor, one or more compounds of the Formula III above. Examples 4 and 14 relate to abrasive compositions, an aqueous isopropanol suspension of an abrasive material and are based on a water emulsifiable polish containing an abrasive soap.ALSO:Treatment of a metal or metal alloy surface to inhibit tarnishing or corrosion comprises contacting the surface with a bis-benzotriazole of the formula FORM:1081282/C6-C7/1 wherein X represents a direct link, a C1- 6 straight chain alkylene radical optionally substituted by one or more C1- 4 alkyl groups; a 1, 1-cyclohexyl radical; a carbonyl radical; a sulphuryl radical; an oxygen atom or a sulphur atom. Treatment can be effected by 1 dipping, padding or spraying the surface with a solution of the benzotriazole in aqueous organic solvents, 2 condensing the vapour of the compounds on the surface of the metal, 3 wrapping the metal in a packaging material impregnated with the benzotriazoles, 4 polishing the metal surface with an abrasive or non-abrasive polish or 5 incorporating the benzotriazoles in a functional fluid, e.g. lubricants, which are used in the presence of the metal surface. Examples 2-4, and 13-16 relate to the treatment of copper and cadmium.ALSO:The invention comprises bis-benzotriazoles of the formula FORM:1081282/C2/1 wherein X represents a C1- 6 straight chain alkylene radical which is substituted by 1 or 2 C1- 4 alkyl groups when the alkylene radical is methylene, or substituted by 1 or more C1- 4 alkyl groups when the alkylene radical contains 2-6 carbon atoms, or unsubstituted when the alkylene radical contains 2-6 carbon atoms; a 1,1-cyclo-alkyl radical of at least 5 carbon atoms, a carbonyl group, a sulphuryl group; an oxygen atom or a sulphur atom. The compounds can be made by treating a tetra-amino compound of the formula FORM:1081282/C2/2 with nitrous acid, or with a compound capable of forming nitrous acid under the reaction conditions, in such an amount that only two of the amino groups are diazotized; the benzotriazole is then formed by simultaneous elimination of water. The compounds in which X is a carbonyl group may also be prepared by reacting the tetrahydrochloride of 3,31,4,41-tetra-amino-benzophenone with sodium nitrite or by controlled oxidation of the corresponding bis-(benzotriazolyl) methane. The compound in which X is a sulphuryl group may also be prepared by oxidation of bis-(benzotriazolyl-5) sulphide. The bis-benzotriazoles are used as tarnish and corrosion inhibitors (see Divisions C4, C5 and C7). Examples describe the preparation of compounds in which X is (5) carbonyl, (6) oxygen, (7) sulphuryl, (10) ethylene, (11) 1,1-cyclohexylidene and (12) 2,2-propylene radicals. The amines of the Formula XII above are made by nitrating the diamine of the formula FORM:1081282/C2/3 optionally while protecting the amine groups by acylation, and then reducing the resulting amine of the formula FORM:1081282/C2/4 either catalytically or using HCl and Fe or Sn. 4,41-Diamino-3,31-dinitrobenzophenone can be prepared by nitrating 4,41-dichlorobenzophenone to give 3,31-dinitro-4,41-dichlorobenzophenone benzophenone which is heated with ammonia at an elevated temperature to given the aminonitro compound. Bis - benzotriazole and bis - (benzotriazolyl)-methane can be made by methods analogous to those used for compounds of the Formula III, viz. from the corresponding tetra-amines which are prepared from the diamino-dinitro compounds. 3,31 - Dinitro - 4,41 - diamino -diphenylmethane can be prepared by rearrangement of N,N1 - methylene - bis - o - nitroaniline (Examples I and 8).