Patent GB-870048-A (GB)
Title: Modified organic fluids of the borate-glycol type and methods of producing same
IPC: C10M169/04
Filed: 1958-03-04
Abstract: Borate-glycol condensation products are made by heating together a tetraborate or metaborate of an alkali or alkaline earth metal and a glycol having 2-6 carbon atoms or a monoalkyl ether thereof having 1-4 carbon atoms in the alkyl group; the heating being continued until the product is substantially homogenous and the total amount of water removed from the reaction mixture is not substantially less than the amount of water (if any) initially present in the reactants and does not substantially exceed the sum of the water (if any) initially present in the reactants and one-half of all the water possible of formation in the condensation of the reactants.  Products obtained by using a molar ratio of glycol (or glycol ether) to borate of 3 : 1 to 12 : 1 are suitable as corrosion inhibiting agents for adding to hydraulic fluids based on glycols or glycol ethers, heat-exchange fluids, lubricating oils or cutting oils (see Group III) and to resins.  Products obtained by using a molar ratio of glycol (or glycol ether) to borate of 50 : 1 to 400 : 1 are themselves suitable as hydraulic fluids.  Reaction is effected at 75 DEG -125 DEG C., preferably under reduced pressure, and when starting from a glycol ether, a glycol is used as a diluent.  Specified glycols are ethylene-, diethylene-, triethylene-, 1 : 2-propylene-, 2 : 3-butylene- and 1 : 4-butylene glycols, and 2-methyl-2 : 4-pentanediol.  Specified glycol ethers are the methyl, ethyl, isopropyl and butyl ethers of diethylene glycol.  Specification 439,788 is referred to.ALSO:Borate-glycol condensation products are made by heating together a tetraborate or metaborate of an alkali or alkaline earth metal and a glycol having 2-6 carbon atoms or a monoalkyl ether thereof having 1-4 carbon atoms in the alkyl group; the heating being continued until the product is substantially homogeneous and the total amount of water removed from the reaction mixture is not substantially less than the amount of water (if any) initially present in the reactants and does not substantially exceed the sum of the water (if any) initially present in the reactants and one-half of all the water possible of formation in condensation of the reactants.  Products obtained by using a molar ratio of glycol (or glycol ether) to borate of 3:1 to 12:1 are suitable as additives to hydraulic fluids, heat-exchange fluids, lubricating oils or cutting oils (see Group III) or to resins.  Products obtained by using a molar ratio of glycol (or glycol ether) to borate of 50:1 to 400:1 are themselves suitable as hydraulic fluids.  Reaction is effected at 75 DEG -125 DEG C., preferably under reduced pressure, and when starting from a glycol ether, a glycol is used as a diluent. Specified glycols are ethylene-, diethylene-, triethylene-, 1:2-propylene-, 2:3butylene- and 1:4-butylene glycols and 2methyl-2:4-pentanediol.  Specified glycol ethers are the methyl, ethyl, isopropyl and butyl ethers of diethylene glycol.  Examples are given.  Specification 439,788 is referred to.ALSO:Borate-glycol condensation products, having improved corrosion-inhibiting properties, and suitable for use as hydraulic fluids, heat-exchange fluids, lubricating oils and cutting oils or additives to these substances are made by heating together a tetraborate or metaborate of an alkali or alkaline earth metal and a glycol having 2-6 carbon atoms or a monoalkyl ether thereof having 1-4 carbon atoms in the alkyl group (see Groups IV(a) and IV(b)).  In Examples (17) A brake fluid comprises ethylene glycol monobutyl ether, diethylene glycol monobutyl ether, a polyalkylene glycol lubricant and a condensation product of sodium tetraborate and diethylene glycol; (18) A hydraulic fluid comprises ethylene glycol, dipropylene glycol methyl ether, a polyalkylene glycol lubricant and a condensation product of potassium tetraborate and diethylene glycol; (19) A hydraulic fluid comprises diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, a polyalkylene glycol lubricant, diethylene glycol and a condensation product of potassium tetraborate and diethylene glycol. Specification 439,788 is referred to.