DE2442754A1 - DETERGENT PREPARATIONS - Google Patents

Description

8 MUNICH 70 Dipl. INQ. JULIUS QILIAkD Mittewalder Strasse 34

PATENT ADVERTISER FERNRUF 745775

TELEX 0524655

Patent application dated September 6th

AB Helios Kemisk-Tekniska Factory

S - 126 11 Stockholm 32

Sweden

our sign:

Detergent preparations

The invention relates to detergent preparations, in particular for hard surfaces made of aluminum and aluminum alloys.

It is known that aluminum and most light metal alloys more or less sharp from moderately strong and all strong alkaline chemicals are attacked with the exception of ammonium hydroxide. The attack by weak alkaline detergents, on the other hand, are low. In the food industry, especially when salting flax products, very often equipment containing plates and other parts made of aluminum is used. For such equipment are generally used, the surface-active substances, inorganic and detergent preparations contain organic chelating agents and alkali metal silicates, in particular sodium or potassium metal silicate. Both Form necessary high concentrations of meta-silicate silicate deposits, which adhere very strongly to the aluminum surfaces and make them unsightly. At low Concentrations or the complete absence of meta-silicate, on the other hand, affect the cleaning effect. The present invention aims to overcome the drawbacks mentioned above. When looking for to discount the attack on aluminum of the detergents commonly used was suitable inhibitors surprisingly

509811/1158

Dipl. INQ. JULIUS QILIARD

PATENT ADVOCATE

2Λ42754

found that even comparatively small amounts of alkali metal salts the unsaturated fatty acids, which are added to solutions of sodium and / or potassium hydroxide, are sufficient, in order to substantially reduce the aggressiveness of these solutions against aluminum. This fact is even more surprising than the fact that the addition of saturated fatty acid salts is negligible.

Very satisfactory results are obtained in this regard with oleic acid, linoleic acid, tall oil acid and ricinoleic acid, to mention some of the unsaturated fatty acids. In comparison, the salts of saturated fatty acids, such as palmitic acid, o ^ -sulphopalmitic acid, tallow fatty acid, lauric acid, Coconut fatty acid and eurocinic acid, not as inhibitors act, are called.

The table shows a typical selection of the investigated detergent solutions with different amounts of active components, d. H. Alkali and an inhibitor. From the table you can see how disadvantageous the influence of additions of Sodium tripolyphosphate (STPP), nitrile triacetate acid (NTA), ethylenediamine tetraacetic acid (EDTA) and meta-silicate (Meta) affects. Such substances should be avoided as additives will.

% Alkali KOH pH 0 % _ Inhibitor Type of inhibitor
Alkali metal of Aluminum corrosion
Time 15 m, Tempe
temperature: 70 + 5 ⁰ C 0.1 ti 12, 3- - none heavily attacked 0.25 Il 12, 6th - Il _ ·· _ 0.5 Il 12, 0 Il very strong
grabbed 0.5 Il Il 0 , 25 Tall oleic acid not attacked 0.5 Il Il 0 , 125 - Il _ _ »I -. 0.5 Il , 075 _ ι · _ _ H -

509811/1158

Dipl.iNQ. JULIUS QILIARD

PATENT ADVOCATE

% Alkali pH ^ Inhibitor Type of inhibitor
Alkali metal of Aluminum corrosion
Time 15 m, tempera
ture: 70 + 5 C 0.5 KOH 12.6 0.025 Tall oleic acid very easily attacked 0.5 " it ' 0.5 Palmitic acid heavily attacked 0.5 " ti 0.25 _ »'_ _ Il _ 0.5 " 11 0.1 _ ti _ - ■ «ι - o, 5 " It 0.5 0 (-Sulphopalmitine-
acid very badly attacked 0.5 " It 0.25 Di- - "- attacked 0.5 " Il 0.1 _ ti _ - II _ 0.5 " M. 0.05 _ «_ _ Il _ 0.5 " M. 0.5 oO-Sulphopalmit in
acid e heavily attacked mono- 0.5 " Il 0.25 _ Il _ _ Il _ 0.5 " Il 0.1 _ll _ - '· _ 0.5 " It 0.05 _ Il _ - II _ 0.5 " Il 0.25 Sebum fatty acid very badly attacked 0.5 " ti 0.25 1,2 dicarboxylic acid - ι · _ 0.5 " Il 0.5 Lauric acid heavily attacked 0.5 ^M. Il 0.1 _ "_ attacked 0.5 " Il 0.05 - ·· _ - Il _ 0.5 " ti 0.5 Coconut fatty acid heavily attacked 0.5 " dd 0.25 _ ti _ _ ι · _ 0.5 " ti 0.1 _ »_ _ Il _ 0.5 " ti 0.05 - · '_ - ι · _ 0.5 " Il 0.5 Eurucic acid very badly attacked 0.5 " Il 0.25 _n _ _ Il _ 0.5 " It 0.1 _ n _ _ Il _ 0.5 " It 0.05 - ι · _ 0.5 " dd 0.25 Oleic acid not attacked 0.5 " ti 0.1 _ «Ι _ _ It _ 0.5 " Il 0.05 _ ti _ _ Il _

50981 1/1158

Dipl. INQ. JULIUS QILIARD PATENT ADVOCATE

2U2754

% Alkali pH ^ Inhibitor Type of inhibi
tors; Alkali
tall by Aluminum corro
sion; Time 15 m;
Temperature: 7O + ^ _ 5 ° C 0.5 KOH 12.6 0.25 Linoleic acid not attacked 0.5 » ti 0.1 _ »· _ _ 11 _ 0.5 " ti 0.05 _ M - _ »Ι - 0.5 " Il 0.25 licxnolic acid _ 11 _ 0.5 " Il 0.1 _ »_ _ Il _ 0.5 " It 0.05 _ Il _ _ «Ι _ 0.5 NaOH Il 0.05 Tall oil fire _ It _ 0.5 ·· It 0.025 _ ·> _ very light
grabbed 0.25 NaOH?
0.25 KOH. j Il 0.05 _ "1 _ not attacked 0.25 NaOH ?
0.25 MEA J 12.3 0.05 _ »· _ _ ι · _ 0.25 NaOH (
0.25 NH ^ OHj Il 0.05 _ »_ _ 11 _ 0.25 KOH)
0.25 NH ^ OH j ti 0.05 _ »» _ _ n _ 0.25 KOH 1
0.25 Na ₂ CO ₃ V 12.4 0.05 _ "1 - _ 11 _ 0.25 KOH J.
0.25 meta J. 12.6 0.05 - H _ attacked 0.25 KOH?
0.25 STPPJ 12.2 0.05 _ "1 _ heavily attacked 0.25 KOH ?
0.25 stppJ dd 0.25 - "- _ Il _ 0.25 KOH ?
0.25 STPPJ It 0.7 _ ·· - _ Il _ 0.25 KOH Ι
0.25 stpp / dd i, 4 _ Il _ _ »_ 0.25 KOH;
0.1 STPPJ dd 1.4 _ Ii -. _ Il _ 0.25 KOH ?
0.25 NTA J. 12.6 0.05 _ M - _ It _ 0.25 KOH ?
0.25 NTA 7 Il 0.25 - "- _ It _ 0.25 KOH Ρ
0.25 EDTAj ti 0.05 - «_ _ Il _ 0.25 KOH ?
0.25 EDTAJ dd 0.25
50981 1 _ Il _
1 1 58 - Il _

Dipl. INo. JULIUS QILIARD

PATENT ADVOCATE

pH ^ Inhibitor Type of inhibi Aluminum corrosion % Alkali tors; Alkali Time 15 m. Tempera tall by ture: 70 + 5 C 12.6 0.7 Tall oleic acid heavily attacked 0.25 KOH?
0.25 meta / 1.5 NaOH; 13.5 0.075 - "- not attacked 0.14 KOHJ 13.0 0.35 - H _ - "- 0.7 KOH 13.5 o, 7 - H - _ H _ l, k KOH

The detergent formulations of the present invention are particular Suitable for surfaces made of aluminum and aluminum alloys and are characterized by the fact that they are in addition to water as a solvent as components essentially one or more hydroxides of alkali metals together with added, as Contain inhibitor-acting salts of unsaturated fatty acids. If the detergent preparation is to be diluted with hard water, it is preferred to use adducts of talc fatty alcohol with about Add 11 moles of ethylene oxide per mole of alcohol. The ethylene oxide adduct acts as a calcium soap binder dispersant even in small amounts and significantly reduces foaming. Detergent preparations according to the invention become advantageous used at temperatures above room temperature, for example at 70 ° C, for cleaning grill ovens. Even at boiling point can use the detergent without dissolving aluminum

at
and even a very high pH value of 12-13

50981 1/1158

Claims (5)

Claims 1. Detergent preparation, especially for surfaces made of aluminum and aluminum alloys, consisting essentially of water as solvent, one or more alkali metal hydroxides, preferably sodium and potassium hydroxide, together with salts of unsaturated fatty acids, which act as inhibitors act, and possibly a calcium soap binding dispersant, 2. detergent preparation according to claim 1, characterized in that that the salts of unsaturated fatty acids, salts of oleic acid, linealic acid, tall oleic acid and ricinoleic acid are. 3. detergent preparation according to claim 2, characterized in that that the salts of unsaturated fatty acids are not less than 0.029 (percent by weight. 4. Detergent preparation according to claim 1 to 3 »characterized in that that the alkali metal hydroxides make up no less than Ο, 19έ percent by weight. 5. detergent preparation according to claim 1 to 4, characterized in that that they use an ethylene oxide adduct of talc fatty alcohol as calcium soap BxndedispergierungsmxtteJ. contains. 509811/1158