Classifications

• • C—CHEMISTRY; METALLURGY
  • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
  • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
  • C23G5/00—Cleaning or de-greasing metallic material by other methods; Apparatus for cleaning or de-greasing metallic material with organic solvents
  • C23G5/02—Cleaning or de-greasing metallic material by other methods; Apparatus for cleaning or de-greasing metallic material with organic solvents using organic solvents
  • C23G5/028—Cleaning or de-greasing metallic material by other methods; Apparatus for cleaning or de-greasing metallic material with organic solvents using organic solvents containing halogenated hydrocarbons
  • C23G5/02854—Cleaning or de-greasing metallic material by other methods; Apparatus for cleaning or de-greasing metallic material with organic solvents using organic solvents containing halogenated hydrocarbons characterised by the stabilising or corrosion inhibiting additives
  • C23G5/02883—Nitrogen-containing compounds
  • C23G5/02887—Nitro-compounds
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C17/00—Preparation of halogenated hydrocarbons
  • C07C17/38—Separation; Purification; Stabilisation; Use of additives
  • C07C17/42—Use of additives, e.g. for stabilisation
• • C—CHEMISTRY; METALLURGY
  • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
  • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
  • C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
  • C11D7/50—Solvents
  • C11D7/5004—Organic solvents
  • C11D7/5018—Halogenated solvents
• • C—CHEMISTRY; METALLURGY
  • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
  • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
  • C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
  • C11D7/22—Organic compounds
  • C11D7/26—Organic compounds containing oxygen
  • C11D7/266—Esters or carbonates
• • C—CHEMISTRY; METALLURGY
  • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
  • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
  • C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
  • C11D7/22—Organic compounds
  • C11D7/26—Organic compounds containing oxygen
  • C11D7/267—Heterocyclic compounds
• • C—CHEMISTRY; METALLURGY
  • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
  • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
  • C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
  • C11D7/22—Organic compounds
  • C11D7/28—Organic compounds containing halogen
• • C—CHEMISTRY; METALLURGY
  • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
  • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
  • C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
  • C11D7/22—Organic compounds
  • C11D7/32—Organic compounds containing nitrogen

Definitions

• This invention relates to a 1,1,1-trichloroethane composition which has been stabilized against metals.
• 1,1,1-trichloroethane is widely used commercially as a degreasing solvent for cleaning metal products.
• 1,1,1 trichloroethane comes into contact with metals, and especially aluminum, it reacts therewith very fast and is decomposed to form hydrochloric acid and a brown tany matter.
• 1,1,1-trichloroethane Various organic compounds are being added either singly or in combination to 1,1,1-trichloroethane as the stabilizer.
• this stabilizer-containing 1,1,1- trichloroethane is used under harsh conditions, such as in steam cleaning and ultrasonic cleaning in contact with such metals as aluminum, iron, zinc and brass, it is difficult for it to provide results which are satisfactory.
• the differences in the cleaning conditions at the different workships have an effect on the stability of 1,1,1-trichloroethane.
• the stability of 1,1,1-trichloroethane containing the same stabilizer will be influenced by such various conditions as the type and size of the cleaning machine, the method of heating, the class and size of the metals to be cleaned, the extent of the accumulation of the metallic scraps, the class of the cutting oil, the method of distillation and recovery, the number of cleansing times and the amount of admixed water.
• 1,1,1-trichloroethane as a metal detergent, the admixture of water therein is not desirable, since this results in the hydrolysis of 1,1,1-trichloroethane. Especially, in a system in which aluminum and water are copresent the decomposition of 1,1,1-trichloroethane is accelerated. Therefore, the admixture of water in 1,1,1-trichloroethane is usually held to be most undesirable. However, as a.
• An object of the present invention is to provide a 1,1,1- trichloroethane composition which is stabilized to not only aluminum but also such other metals as iron, zinc and brass.
• Another object of the invention is to provide a stabilized 1,1,1-trichloroethane composition which demonstrates an improved stability when used in a water-containing system.
• the present invention provides a stabilized 1,1,1-trichloroethane composition containing 1,4-dioxane, acrylonitrile, an alkyl acetate and a nitroalkane.
• the stabilized 1,1,1-trichloroethane of the invention contains, based on the 1,1,1-chloroethane, 0.1-5.0 weight percent, and preferably 1-4 weight percent, of 1,4-dioxane, 0.01-1.0 weight percent, and preferably 0.1-0.5 weight percent of acrylonitrile, 0.05-30 weight percent, and preferably 0.1-1.0 weight percent, of an alkylacetate and 0.1-3.0 weight percent, and preferably 0.1-1.0 weight percent of a nitroalkane.
• the alkyl acetates whose alkyl group contains 1-5 carbon atoms e.g., methyl acetate, ethyl acetate and propyl are useable acetate, particularly preferred being ethyl acetate.
• nitroalkane a nitroalkane having an alkyl group of 1-3 carbon atoms, e.g., nitrornethane and nitroethane is suitable.
• a small amount of a phenolic antioxidant may also be added to prevent the oxidative decomposition of the stabilizer.
• test method 1 is a heating-under-reflux corrosion test in which the conditions employed are similar to those in an actual cleansing machine.
• test method 2 is a test for determining the corrosion that results from the hydrolysis of the 1,1,1-trichloroethane.
• the test is carried out with a volume ratio of the 1,1,1-trichloroethane test liquid to Water of 1:1 and in a state in which a water layer is present above the 1,1,1- trichloroethane layer, i.e., in the state of a presence of a great excess of water (in actual practice the presence of Water in such a great amount cannot happen).
• This test is to determine the stability of the 1,1,1-trichloroethane composition of the present invention under such conditions.
• Test method 1.-Heating-under-reflux corrosion test Three hundred-milliliter flasks each equipped with a reflux condenser are each charged with ml. of 1,1,1- trichloroethane test liquids containing the stabilizers indicated in Table 1 in the amounts indicated, following which 0.1 ml. of Water is added. Two aluminum test pieces (40 x 20 X 5 mm. in dimensions) Whose surface has been thoroughly polished are then placed inside each flask. One piece is placed in the test liquid and another similar test piece is suspended in the vapor phase. This flask is then dipped in an oil bath heated at C.
• test liquid Fifty milliliter of the test liquid and 50 milliliters of pure water (pH 6.0) are placed in a separating funnel Test method 2.--'Ilest of corrosion by means of hydrolysis of 1, 1, 1 -trichloroethane
• the 1,1,1-trichloroethane test liquid and water are mixed in a volume ratio of 1:1, after which 150 ml. of the mixture are placed in a 200-ml. flask and, after thorough stirring for about one minute, is rested. Separation into a top and a bottom layer takes place.
• a stabilized composition consisting essentially of 1,1,1-trichloroethane and, as a stabilizer therefore, 0.1- 5.0 weight percent of 1,4-dioxane, 0.01-1.0 weight percent of acrylonitrile, -0.05-3.0 weight percent of ethyl acetate and 0.1-3.0 weight percent of nitromethane.
• a stabilized composition consisting essentially of 1,1,1-trichloroethane and, as a stabilizer therefor, 1-4 weight percent of 1,4-dioxane, 0.1-0.5 Weight percent of acrylonitrile, 0.1-1.0 weight percent of ethyl acetate and 0.1-1.0 weight percent of nitromethane.

Landscapes

• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Engineering & Computer Science (AREA)
• Wood Science & Technology (AREA)
• Oil, Petroleum & Natural Gas (AREA)
• Life Sciences & Earth Sciences (AREA)
• General Chemical & Material Sciences (AREA)
• Materials Engineering (AREA)
• Mechanical Engineering (AREA)
• Metallurgy (AREA)
• Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
• Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
• Detergent Compositions (AREA)
• Preventing Corrosion Or Incrustation Of Metals (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=14740666

Family Applications (1)

Country Status (5)

Cited By (4)

Families Citing this family (1)

Family Cites Families (2)

• 1970
  • 1970-12-26 JP JP45118604A patent/JPS5035045B1/ja active Pending
• 1971
  • 1971-12-21 US US00210542A patent/US3848004A/en not_active Expired - Lifetime
  • 1971-12-22 GB GB5968471A patent/GB1328000A/en not_active Expired
  • 1971-12-23 DE DE2164259A patent/DE2164259C3/de not_active Expired
  • 1971-12-24 FR FR7146611A patent/FR2119749A5/fr not_active Expired

Also Published As

Similar Documents