DE3532586C1 - Phosphate-free, acidic detergent in powder form for dishwashers - Google Patents

Description

ther with between 3 and 30 moles of ethylene oxide, which in conventional agents owing to too strong foam development could not be used.

The terminally alkylated fatty alcohol polyethylene glycol ethers can also be used as nonionic surfactants can be used, such as B. Lauryl alcohol polyethylene glycol methyl ether. All of the proposed nonionic surfactants act in the detergent according to the invention wetting and cleaning and are particularly easily biodegradable, d. H. environmentally friendly.

The fillers are used to make the powder easier to granulate and to set a suitable one Bulk weight for the purpose of easier dosing by the housewife. The preferred filler is sodium sulfate used.

The carrier silica ensures, in a known manner, that the detergent has good flowability by the binds moisture present in the individual components. At the same time, it ensures good shelf life of the detergent powder.

In the composition described, the detergent according to the invention also cleans heavily soiled Crockery perfectly in the machine, with all commercially available machines being equally suitable. With the exception of the filler and the carrier silica, which are inert, the detergent is biological Sewage treatment plants fully degradable. Furthermore, it does not lead to human skin or mucous membranes Irritation or damage. The described disadvantages of the known detergents are thus avoided.

The detergent is usually produced by mixing the individual components in a suitable one Powder mixer.

If the dishes are not too dirty, a rinse aid can be used in the last wash cycle be waived. This is a further step to what is now generally recommended for environmental reasons economical use of detergents.

2 parts of carrier silica with a surface area of ^{500 m 2 / g}
25 parts of sodium sulfate

Example 3

A machine dishwashing detergent made from the following components:

25 parts of polyacrylic acid, medium viscosity

5 parts of acetic acid, conc.
18 parts of citric acid

6 parts of lauryl alcohol polyethylene glycol methyl

ether with 6 moles of ethylene oxide 46 parts of sodium sulfate (heavy sulfate)

example 1

A powdered machine dishwashing detergent made from the following components:

30 parts of polyacrylic acid, medium viscosity
28 parts of citric acid
4 parts of lauryl alcohol polyethylene glycol ether

with 6 moles of ethylene oxide
1 part of carrier silica with a surface

of 400m ² / g
37 parts sodium sulfate (light sulfate)

50

55

Example 2

A powdered machine dishwashing detergent made from the following components:

32 parts of polyacrylic acid, highly viscous
10 parts of zeolite A.
25 parts of tartaric acid
2 parts tallow fatty alcohol polyethylene glycol

ether with 25 moles of ethylene oxide
4 parts of lauryl alcohol polyethylene glycol ether
with 3 moles of ethylene oxide

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Claims (2)

1 2 bacterial poison. The poor biodegradability claims: the alkali-stable surfactants has already been mentioned above. In addition, are highly alkaline with handling 1. Phosphate-free, acidic detergent in substances in the household Danger to people, Powder form for dishwashers especially for children. You grab the re household dishwashers, g e k e η η - skin an and can cause severe distortions in the eyes lead through tongues. When swallowed, with which in children it is always to be expected that these detergents have a) 4-40 percent by weight of a polymeric organ- abdominal pain, vomiting and diarrhea result, niche carboxylic acid, especially a poly- io In extreme cases it can lead to burns that are difficult to heal carboxylic acid come from the esophagus. b) 5-30 percent by weight of at least one but also in its actual intended use, weakly acidic organic acid, cleaning dishes, are the most common Especially a food acid machine dishwashing detergent is not without problems. c) 1-8 percent by weight of a non-ionic 15. The strongly alkaline liquor often leads to attack by the Surfactants on a native basis of the glass surface, which usually leads to the clouding of the glasses d) 0.5-5 percent by weight of carrier silica and repeated use leads. Porcelain will be the same e) Fillers as the respective remainder. Attacked and then appears matt. Frequently will also the decor of the dishes is impaired, the colors 2. Machine detergent according to claim 1, characterized 20 pale or disappear completely. This has characterized the development that, as a food acid, citric acid is what is known as dishwasher-safe genetic acid is used. schirrs made necessary. The change from the strongly alkaline main wash cycle the slightly acidic rinse cycle increases the 25 handle of the decor and the glass surfaces. The invention is based on the object of providing a pul- Dishwashers today work in a form of liquid detergent for household and commercial use Two-bath process. In this case, a winding machine is to be created in the main wash cycle that has the disadvantages mentioned Powdered detergent used while im after- does not have to be regarded as environmentally friendly When the rinse cycle is switched on, a liquid rinse aid can be used and can be used for household machines without any problems will. net, d. H. for machines that are not subject to constant The rinse aids usually consist of meshing, subject to testing or maintenance, low-foaming nonionic surfactants, which The above object is according to the invention are slightly acidified with an organic acid, surprisingly according to the characteristics of the Paeventuelle Dissolve limescale stains on the dishes. 35 tent claims 1 solved. In terms of environmental compatibility, they do not pose a problem. The detergent according to the invention is acidic serious problem and free of phosphates. Practical test series The powdery main cleaners, on the other hand, consist of standard dishwashers First and foremost from strongly alkaline substances such as Na- give that in the professional world existing concerns against tron lye or soda, a high proportion of phosphate 40 a so-called "acidic rinsing" in dishwashing machines and silicates and a substance that produces active chlorine when using food acids, d. H. splits off such as B. Sodium dichlorocyanurate. The main weak organic acids are unfounded, If the alkalis are removed, the polycarboxylic acid acts as a complexing agent and is water-insoluble rather soiling such. B. the fats by versing to increase detergency. It thus replaces the fung. Phosphates and silicates serve to improve 45 phosphates. the washing effect and the binding of lime, while the preferred food acid is the citric the chlorine has a bleaching effect, through the use of the nenic acid. Tartaric acid are also suitable, sparingly soluble stains such as B. dried coffee- malic acid or acetic acid or mixtures of the and tea residues are removed. Surfactants are often called acids. Basically every weak sauna cannot or only used in small quantities, in particular reactive organic acids are used, because the previously known low-foaming acids are preferred, however, which the substance And alkali-stable surfactants (so-called Pluronics) do not interfere because of their change and are therefore particularly biologically poor biodegradability are only tolerated. The food acids turn out to be is approved for use in cleaning agents not only as environmentally friendly but also as äusind. 55 extremely effective complexing agents and lead against it The well-known powder detergents are widely believed not to cause damage, especially dishwashers have several disadvantages. Especially corrosion damage to the dishwashers, In particular, their components lead to environmental pollution or at least to aggravate the biohch made of stainless steel, gical wastewater treatment. Alkalis are only after 60 As non-ionic surfactants, in particular the strong dilution or neutralization sewage treatment plants ethoxylates so-called native fatty alcohols, which can be supplied from fats. The phosphates are not recovered in sewage treatment plants, used, preferably lauryl alcohol polychanged and thus get into the waters. Man glycol ether with 6 moles of ethylene oxide. A benefit of the has therefore endeavored for many years, the phosphate detergent according to the invention offers the possibility of halt in detergents and cleaning agents, 65 to forego low-foaming surfactants, as the around the eutrophic acids used by the phosphates have a foam-suppressing effect. Darung to eliminate the waters. Sodium dichlorocyanu-through it becomes possible the better cleaning higher ones rat is, as far as it gets into the sewage, a strong ethoxylate such. B. Tallow fatty alcohol polyethylene glycol