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
  • C23G5/032—Cleaning or de-greasing metallic material by other methods; Apparatus for cleaning or de-greasing metallic material with organic solvents using organic solvents containing oxygen-containing 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
  • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
  • C11D3/16—Organic compounds
  • C11D3/20—Organic compounds containing oxygen
  • C11D3/2093—Esters; 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
  • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
  • C11D3/43—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
  • C11D7/50—Solvents
  • C11D7/5004—Organic solvents
  • C11D7/5022—Organic solvents containing oxygen
• • 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
  • C11D2111/00—Cleaning compositions characterised by the objects to be cleaned; Cleaning compositions characterised by non-standard cleaning or washing processes
  • C11D2111/10—Objects to be cleaned
  • C11D2111/14—Hard surfaces
  • C11D2111/16—Metals

Definitions

• the invention relates to the use of (C 1 -C 5 ) alkyl esters of aliphatic (C 8 -C 22 ) monocarboxylic acids.
• the invention further relates to an agent and a method for cleaning metallic objects.
• EP-B1-435 943 discloses the use of (C 1 -C 5 ) alkyl esters of aliphatic (C 8 -C 22 ) monocarboxylic acids for removing printing ink from printing presses.
• the application rollers or printing blankets made of rubber are treated with an agent which contains these alkyl esters.
• Liquid metal cleaning agents usually contain large amounts of organic solvents, which are mostly selected from the groups of unsubstituted and substituted hydrocarbons, as well as so-called white spirit or VOC chemicals (volatile organic chemicals). In the course of the ongoing environmental discussion and tightening legal regulations, such solvents are to be largely replaced by less hazardous chemicals.
• the object of the invention is therefore to largely exclude or completely avoid the disadvantages described in the known metal cleaning agents. As a result, the usual cleaning processes for metallic objects are also to be improved.
• the (C 1 -C 5 ) alkyl esters of aliphatic (C 8 -C 22 ) monocarboxylic acids or their mixtures are used for cleaning metallic objects or for producing a cleaning agent for metallic objects.
• a so-called metal cleaner or - in common parlance - "industrial cleaner” can be produced, in which a product obtainable from so-called renewable raw materials can be used.
• the esters used are non-toxic and biodegradable. They also have a high flash point. From these few details, the decisive advantages over conventional cleaning agents, which contain a large amount of the organic solvents mentioned, result.
• esters mentioned or their mixtures can in principle be used to clean all metallic objects. Under certain circumstances, these metallic objects can also be at least partially coated with other materials, for example, be painted.
• a preferred area of application of the invention is in particular the cleaning of motor vehicle parts and possibly motor vehicles themselves, the esters being used in particular as engine cleaners or wheel rim cleaners.
• esters that fall under the above definitions can in principle be used. They are essentially the (C 1 - C 5 ) alkyl esters of alkane carboxylic acids and their unsaturated representatives with 8 - 22 C atoms. These esters of the so-called middle and higher fatty acids (up to C 22 ) can be handled for the use according to the invention, the esters liquid at room temperature being preferred.
• the esters can be prepared in a known manner by esterification of the corresponding monocarboxylic acid or a mixture of such acids with the corresponding alcohol.
• the esters can also be obtained in the usual way by transesterification (alcoholysis) of the glyceride (fat / oil) concerned with the corresponding (C 1 -C 5 ) alcohol.
• Important representatives of the esters or mixtures of such esters which can be used according to the invention are already being produced and sold on a large scale.
• rapeseed, sunflower, coconut, oil palm kernel and castor oil are particularly suitable as raw materials for the esters which can be used according to the invention.
• (C 1 -C 3 ) alkyl esters of (C 8 -C 22 ) monocarboxylic acids or mixtures thereof are used.
• the methyl esters of these monocarboxylic acids can be used.
• esters of aliphatic (C 10 -C 22 ) monocarboxylic acids are preferred, the esters of aliphatic (C 16 -C 20 ) monocarboxylic acids in particular being usable in accordance with the invention.
• both the esters of aliphatic, saturated monocarboxylic acids and the esters of aliphatic, unsaturated monocarboxylic acids can be used in the invention.
• the esters of aliphatic, saturated monocarboxylic acids (and their mixtures) are preferred on account of the good availability and the mostly sufficient cleaning action.
• the use of esters of aliphatic, unsaturated monocarboxylic acids or, preferably, of mixtures of esters of aliphatic, saturated monocarboxylic acids with esters of aliphatic, unsaturated monocarboxylic acids is recommended when an increased cleaning action is desired, which can be associated with the proportion of esters of aliphatic, unsaturated monocarboxylic acids .
• esters of aliphatic, unsaturated monocarboxylic acids are used, monounsaturated to triunsaturated monocarboxylic acids are preferably provided. This can be, for example, oleic acid, erucic acid, linoleic acid or linolenic acid. As already mentioned, esters of ricinoleic acid can also preferably be used.
• the esters mentioned can be used not only as such, ie undiluted (if appropriate with suitable additives), but also in a mixture with at least one organic solvent. It can be done in such a way that the previously known metal cleaning agents with organic solvent the proportion of organic solvent is replaced by adding the corresponding ester or ester mixture.
• the aforementioned hydrocarbons, mineral spirits or VOC chemicals are used as organic solvents, the structure and composition of which are known to the person skilled in the art and which can be purchased.
• so-called high-boiling solvents are preferably used in order to ensure the highest possible flash point of the mixture obtained.
• a flash point> 100 can be achieved with such mixtures, which has a significant advantage over the conventional cleaning agents of the prior art. Accordingly, less stringent hazard regulations must be observed in the manufacture, transport, storage and use of the cleaning agents according to the invention than has hitherto been necessary with the conventional cleaning agents.
• the mixture of ester and organic solvent is selected so that the highest possible flash point is achieved taking into account other required properties.
• esters When using the esters in a mixture with organic solvent, preferably at least 10% by volume of ester, in particular at least 50% by volume of ester, is provided. In principle, the largest possible proportion of organic solvent should of course be "replaced" by the esters.
• an aqueous emulsion which by adding water and at least one emulsifier to the ester or the ester mixture or to the mixture of ester and organic solvent is available.
• water and at least one emulsifier to the ester or the ester mixture or to the mixture of ester and organic solvent is available.
• the advantageous properties of water can be incorporated into the mixture obtained overall, ie the emulsion.
• To prepare the emulsion in particular 10-90% by volume of water and 1-10% by weight of emulsifier (based on the total weight of the emulsion) are added to the ester or the ester mixture or to the mixture of ester with organic solvent.
• Emulsifier based on the total weight of the emulsion.
• the known compounds are suitable as emulsifiers, nonionic emulsifiers being preferred.
• At least one corrosion inhibitor can be provided which prevents the metallic object from being attacked by the cleaning agent.
• Corrosion inhibitors of this type are added in an amount of up to 3% by weight, preferably between 0.5 and 2% by weight, based on the total weight of the cleaning agent used.
• Compounds which are already known, such as, in particular, aliphatic primary amines, can also be used as corrosion inhibitors.
• At least one surface-active agent can be provided, which is added in particular in an amount of up to 10% by weight, preferably between 0.3 and 3% by weight, based on the total weight of the cleaning agent used.
• Conventional compounds can also be used here, for example polyglycol ethers of long-chain aliphatic alcohols.
• the invention also relates to a preferably liquid cleaning agent for metallic objects, which is preferably provided for cleaning machines and for cleaning motor vehicles and their parts, such as in particular engines or rims.
• This cleaning agent is characterized in that it contains at least 10% by volume of a (C 1 -C 5 ) alkyl ester of an aliphatic (C 8 -C 22 ) monocarboxylic acid or mixtures of such esters.
• the invention relates to a cleaning method for metallic objects, which is preferably provided for cleaning motor vehicles or their parts, such as in particular engines or rims.
• This method is characterized by the use already described or by the use of the cleaning agent described. Reference is expressly made to the corresponding passages in the description.
• the method according to the invention can be carried out in the usual way for cleaning the metallic objects, the esters mentioned being used.
• the cleaning agent is applied to the metallic object to be cleaned, for example the engine or the rim of the motor vehicle, in particular sprayed on.
• the cleaning agent ie usually the cleaning solution, is left to act for a certain time.
• it is preferably rinsed with water or sprayed off preferably removed with steam again from the metallic object.
• it can be dried if necessary.
• a mechanical cleaning treatment can additionally be carried out during at least part of the contact time.
• this involves wiping and / or brushing, for example to additionally mechanically remove the dirt that has been detached from the cleaning agent.
• the process can also be carried out by first pretreating with the cleaning agent according to the invention, possibly with a longer exposure time, and then performing a further cleaning with other customary washing or cleaning agents.
• the ester mixture mentioned has the following properties Melting temperature -10 ° C Vapor pressure (20 ° C) ⁇ 0.01 mbar Density (20 ° C) 0.89 g / cm 3 Viscosity at 25 ° C 6 - 7 mm 2 / s Flash point over non-toxic. 100 ° C
• the mixture described is sprayed onto the rims heavily soiled by normal road traffic. After a few minutes of exposure, the rims are sprayed with steam and dried. The cleaning result can be assessed as very good in comparison to conventional rim cleaners. As already described, in the case of particularly stubborn dirt, the rim can also be brushed after the cleaning agent has been applied.
• a 50:50 (vol.%) Mixture is prepared from the mixture of methyl esters of saturated and unsaturated (C 16 -C 20 ) monocarboxylic acids and mineral spirits described in Example 1 and used in the same manner as in Example 1. The cleaning result is also very good here.
• Example 2 The mixture used in Example 2 is emulsified in 50% by volume of water together with an emulsifier (5% by weight, based on the total weight). If necessary, a corrosion inhibitor and a surface-active agent can be added. Here too, car rims are treated in the same way as in Examples 1 and 2. The cleaning result is also assessed as very good in this third attempt.

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• 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)
• Emergency Medicine (AREA)
• Health & Medical Sciences (AREA)
• Metallurgy (AREA)
• Mechanical Engineering (AREA)
• Materials Engineering (AREA)
• General Chemical & Material Sciences (AREA)
• Detergent Compositions (AREA)
• Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

ID=7771008

Family Applications (1)

Country Status (2)

Cited By (2)

Family Cites Families (15)

• 1995
  • 1995-09-01 DE DE19532284A patent/DE19532284A1/de not_active Withdrawn
• 1996
  • 1996-08-06 EP EP96112644A patent/EP0761843A2/de not_active Withdrawn

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