Classifications

• • 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
  • C11D3/37—Polymers
  • C11D3/3746—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
  • C11D3/3757—(Co)polymerised carboxylic acids, -anhydrides, -esters in solid and liquid compositions
  • C11D3/3761—(Co)polymerised carboxylic acids, -anhydrides, -esters in solid and liquid compositions in solid compositions
• • 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
  • C11D3/02—Inorganic compounds ; Elemental compounds
  • C11D3/12—Water-insoluble compounds
  • C11D3/124—Silicon containing, e.g. silica, silex, quartz or glass beads
• • 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
  • C11D3/2075—Carboxylic acids-salts thereof
  • C11D3/2086—Hydroxy carboxylic acids-salts thereof

Definitions

• Dishwashers today use a two-bath process. A powder detergent is used in the main wash cycle, while a liquid rinse aid is used in the downstream wash cycle.
• the rinse aids generally consist of wetting, low-foaming nonionic surfactants which are slightly acidified with an organic acid to dissolve any limescale stains on the dishes. They are not a serious problem in terms of environmental sustainability.
• the powdery main cleaners consist primarily of strongly alkaline substances such as sodium hydroxide or soda, a high proportion of phosphates and silicates, and a substance that cleaves active chlorine, such as sodium dichlorocyanurate.
• the main task of alkalis is to remove water-insoluble contaminants such as fats by saponification. Phosphates and silicates serve to improve the washing effect and the binding of lime, while the chlorine has a bleaching effect, by means of which sparingly soluble stains such as dried coffee and tea residues are removed.
• the known powder detergents for dishwashers have several disadvantages.
• their components lead to environmental pollution or at least to an aggravation of biological wastewater treatment.
• Alkaline plants can only be added to the treatment plants after strong dilution or neutralization.
• the phosphates are not changed in sewage treatment plants and thus get into the water.
• efforts have therefore been made to reduce the phosphate content in detergents and cleaning agents in order to eliminate the eutrophication of the waters that is caused by the phosphates.
• sodium dichlorocanurate is a strong bacterial poison.
• the poor biodegradability of the alkali-stable surfactants has already been mentioned above.
• the conventional machine dishwashing detergents are also not without problems when it comes to their intended purpose, namely the cleaning of dishes.
• the strongly alkaline liquor often leads to attack on the glass surface, which usually leads to clouding of the glasses after repeated use. Porcelain is also attacked and then appears matt. Often the decor of the dishes is impaired, the colors fade or disappear entirely. This has made the development of so-called dishwasher-safe tableware necessary.
• the invention has for its object to provide a powder detergent for household and commercial dishwashers, which does not have the disadvantages mentioned, can be regarded as environmentally friendly and is suitable for household machines, i.e. for machines that are not subject to constant inspection or maintenance.
• a detergent which is characterized by 4-40 percent by weight of a polymeric organic carboxylic acid, in particular a polycarboxylic acid, at least 5-30 percent by weight a weakly acidic organic acid, in particular a food acid, 1 - 8 percent by weight of a nonionic surfactant on a native basis, 0.5 - 5 percent by weight of carrier silica and fillers as the rest.
• the flushing agent according to the invention is acidic and free of phosphates. Practical series of tests with commercially available dishwashers have shown that existing concerns in the specialist world against so-called "acid rinsing" in dishwashers when using food acids, i.e. weak, organic acids are unfounded.
• the polycarboxylic acid serves as a complexing agent and for strengthening the washing power. It thus replaces the phosphates.
• Citric acid is the preferred food acid. Tartaric acid, malic acid or acetic acid or mixtures of the acids mentioned are also suitable. In principle, any weakly acidic organic acid can be used. However, preference is given to acids which do not disturb the metabolism and are therefore particularly biologically compatible.
• the food acids prove not only to be more environmentally friendly but also to be extremely effective complexing agents and, contrary to widespread belief, do not lead to damage, in particular corrosion damage, to the dishwashers. It is assumed that, as is currently the case, these are made of stainless steel.
• the non-ionic surfactants used are, in particular, the ethoxylates of so-called native fatty alcohols obtained from fats, preferably lauryl alcohol polyglycol ether with 6 moles of ethylene oxide.
• One advantage of the flushing agent according to the invention is the possibility of dispensing with low-foaming surfactants, since the acids used have a foam-suppressing effect. This makes it possible to use the higher purification higher ethoxylates such as e.g. Tallow fatty alcohol polyethylene glycol ether to be used with between 3 and 30 moles of ethylene oxide, which could not be used in conventional agents due to excessive foaming.
• terminally alkylated fatty alcohol polyethylene glycol ethers can also be used as nonionic surfactants, e.g. Lauryl alcohol polyethylene glycol methyl ether. All proposed nonionic surfactants have a wetting and cleaning effect in the detergent according to the invention and are particularly readily biodegradable, i.e. environmentally friendly.
• the fillers serve to make the powder easier to granulate and to set a suitable bulk weight for easier dosing by the housewife.
• Sodium sulfate is preferably used as the filler.
• the carrier silicic acid ensures that the detergent flows well by binding the moisture present in the individual components. It also ensures that the detergent powder can be stored well.
• the dishwashing detergent according to the invention also cleans heavily soiled dishes perfectly in the machine, with all commercially available machines being equally suitable.
• the detergent is fully biodegradable in biological treatment plants. It also does not cause irritation or damage to human skin and mucous membranes. The disadvantages of the known detergents described are thus avoided.
• the detergent is usually produced by mixing the individual components in a suitable powder mixer.
• a powdered dishwasher detergent consisting of the following components:
• a powdered dishwasher detergent consisting of the following components:
• a dishwasher detergent made up of the following components:

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• Chemical & Material Sciences (AREA)
• Life Sciences & Earth Sciences (AREA)
• Engineering & Computer Science (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Oil, Petroleum & Natural Gas (AREA)
• Wood Science & Technology (AREA)
• Organic Chemistry (AREA)
• Health & Medical Sciences (AREA)
• Emergency Medicine (AREA)
• Inorganic Chemistry (AREA)
• Detergent Compositions (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=6280801

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Country Status (2)

Cited By (10)

Families Citing this family (3)

Citations (2)

Family Cites Families (1)

• 1985
  • 1985-09-11 DE DE19853532586 patent/DE3532586C1/de not_active Expired
• 1986
  • 1986-09-05 EP EP86730134A patent/EP0217732A1/fr not_active Withdrawn

Patent Citations (2)

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