DK168219B1 - detergents - Google Patents

Abstract

Aqueous detergent concentrate, characterized in that in addition to water it contains an active detergent comprising the following components: (a) one or more salts of an alkylaryl sulphonic acid, (b) one or more polyethyleneglycol ethers of primary or secondary alcohols and/or of alkylphenols, and (c) one or more salts of sulphated alcohols.

Description

in DK 168219 B1

The present invention relates to aqueous detergent concentrates which, after dilution, preferably after mixing with the desired amount of water, can be used for cleaning, inter alia, service and clothing. The concentrates consist of an aqueous solution containing at least 3 components 5 with a purifying effect. These components, which are specified further below, are collectively referred to as an "active detergent".

It is well known in practice that both the concentrate and the ready-to-use washing liquid have to meet certain viscosity and transparency point requirements, which is the temperature at which turbidity caused by precipitation of solids after strong cooling, completely disappears.

Concentrates are convenient for storage and transport, but of course, the properties of the diluted washing liquid are of importance to the end user. There is a danger that dilution can cause the viscosity to decrease too much, especially if the active detergent consists of alkylarylsulfonate and one or more polyethylene glycol ethers of primary or secondary higher alcohols and / or alkylphenols. A large drop in viscosity when diluted is unacceptable to the buyers of the detergent concentrates, especially housewives, and should therefore be avoided.

It has now been found that by adding a salt of a sulphate alcohol to a detergent concentrate of the above kind, the undesired viscosity drop by dilution can be greatly reduced, while maintaining a low transparency point.

The invention is based on this disclosure and relates to an aqueous detergent concentrate, characterized in that it contains, in addition to water, an active detergent comprising the following components: a) 50-70% by weight of one or more salts of an alkylarylsulfonic acid, 30 b 5 to 30% by weight of one or more polyethylene glycol ethers of primary or secondary alcohols of the general formula R (OC 2 H 2) NOH, where R represents an alkyl group of 8-18 carbon atoms and n represents an integer of 5 to 12; and c) 0.1-25% by weight of one or more salts of sulfated alcohols having 6-16 carbon atoms per molecule.

The detergent concentrate preferably contains at least 10% by weight, and in most cases not more than 70% by weight of the active detergent, based on the weight of the concentrate.

The salts of components a) and c) are preferably alkali metal salts, ammonium salts and / or amine salts. Alkali metal salts are particularly preferred, especially sodium salts.

Component a) is preferably a salt of an alkylbenzenesulfonic acid, especially one containing 8-16 carbon atoms in the alkyl group. The carbon atoms of the alkyl group of component a) preferably form a straight chain.

In the polyethylene glycol ethers of the general formula R- (OC2H4) NOH included in a detergent concentrate according to the invention, the carbon atoms in the alkyl group R preferably form a straight chain.

As the salts of component c), alkali metal salts, especially sodium salts, are particularly preferred. The alcohol from which component c) is derived is preferably a primary or secondary alcohol. The carbon atoms in this alkanol preferably form a straight chain.

The above mentioned undesired viscosity drop by dilution while maintaining a low transparency point is reduced even further if the active detergent also contains a component d) consisting of one or more salts of sulfated alcohol ethoxylates and / or of sulfated alkyl phenol ethoxylates. The salts of component d) are preferably alkali metal salts, ammonium salts and / or amine salts.

Alkali metal salts are particularly preferred, especially sodium salts. Component d) is preferably a sulfurated alcohol ethoxylate, e.g., the sulfated ethoxylate of primary or secondary alcohols with straight or branched chains, especially of alcohol mixtures. Component d) is preferably a sulfated ethoxylate of C Cg g alkanols, especially of C * 12 ^ ^ alkanols. The alkanols are preferably primary and have essentially straight chains, i. that they are less than 30% branched. The most satisfactory alcohols are formed by the hydroformylation of olefins.

The sulfated ethoxylates are prepared from these alcohols by first reacting them with ethylene oxide, conveniently in an amount such that an average of 1-15, especially 2-4, moles of ethylene oxide 5 is added per liter. mole of alcohol (or alcohol mixture), and then sulfate the ethoxylate and neutralize it to form the sulfated alcohol ethoxylate. Suitable sulfated alkylphenol ethoxylates are sulfated alkylphenol ethoxylates having an average of 1-12, especially 1-5, moles of ethylene oxide per liter. mole of alkylphenol. Mixtures of sulfated 10 alcohol ethoxylates and sulfated alkyl phenol ethoxylates may also be used.

The composition of the aqueous detergent concentrate according to the invention may vary within wide limits. Component d), if present, is preferably present in an amount of 0.1-25% by weight. } 15 Particularly preferred concentrates contain 15-25% by weight of component b), 1-25% by weight of component c) and 5-25% by weight of component d). All percent weight parts are calculated as active detergent component of the total amount of active detergent.

The above-mentioned viscosity drop by dilution while maintaining a low transparency point is further reduced even by the presence of MgSO4 in the concentrate. The amount of MgSO4 absorbed in the detergent concentrates depends on the nature and amount of the other ingredients as well as the desired viscosity in the undiluted and diluted state.

In general, amounts of between 0.05 and 10%, based on the weight of the aqueous concentrate, are preferred.

A further advantage of the present invention is that there is generally no need for addition of solubilizer to this aqueous detergent concentrate to improve the solubility of the active detergent so that the composition of the concentrates remains homogeneous during transport and storage, provided that the temperature does not drops to abnormally low levels. A useful practical criterion is to assume that the transparency point should not be more than approx. 5 ° C. If, however, it is desired to add a solubilizing agent, for example, ureas, alkanols having 1-4 carbon atoms per minute can be used. molecule, e.g., 2-propanol, and sodium, potassium, and ammonium salts of arylsulfonic acids substituted with one or more alkyl groups of 1-4 carbon atoms, for example, toluene sulfonic acid and xylenesulfonic acid. Using an alkali metal salt of an alkyl-substituted arylsulfonic acid, e.g., sodium xylene sulfonate, it may also be advantageous to add a lower alcohol, e.g., 2-propanol. The solubilizer content of the concentrates is preferably between 0 and 30% by weight, based on the total amount of active detergent.

The invention is further illustrated by the following examples:

EXAMPLES 1-8 and COMPARATIVE EXAMPLE A-C

Eleven detergent concentrates were prepared by mixing at room temperature of water and components a), b), c) and d) as given in Table I. Component a) was the sodium salt of "DOBANIC ACID" ®. "DOBANIC ACID" ® is a trademark of a mixture of n-alkylbenzenesulfonic acids having 8-13 carbon atoms in the alkyl group. The 15 intermediate used for the preparation thereof, C0-6 alkylbenzene, was prepared by alkylation of benzene with a mixture of Cg defines formed by thermal cracking of paraffin wax. These definitions consisted mainly of definitions with a terminal carbon-carbon double bond. Component b) was "DOBANOL" ® 91-8. "DOBANOL" ® 91-8 is the trademark of a mixture of polyethylene-20 glycol ethers formed by the ethoxylation of linear primary alkanols with 9-11 carbon atoms per liter. molecule and with an average of 8 ethylene oxide groups per molecule. The alkanols consist mainly of 80% straight-chain and 20% alkyl (mainly 2-methyl) isomers. Component c) was "TEEP0L: HB6" ®. "TEEP0L: HB6" ® is the trademark of an aqueous solution of a mixture of sodium salts of sulfated primary alkanols.

Component d) was "DOBANOL" ® 25-3S "." DOBANOL "® 25-3S" is a trademark of a mixture of polyethylene glycol ethers formed by the ethoxylation of linear primary alkanols of 12-15 carbon atoms per minute. molecule and with an average of 3 ethylene oxide groups per molecule. molecule.

From each of the eleven concentrates, three dilute aqueous solutions containing 37, 35 and 30% by weight of active detergent were prepared. The viscosity (in centistokes at 20 ° C) and the transparency point of the solutions thus formed were determined. The results are given in Table I. It can be seen that the dilution viscosity drop in Examples 1-8 according to the invention is considerably smaller than in Comparative Example A-C which is not according to the invention. It is also evident that a much lower transparency point was observed in these 5 examples than in the comparison examples.

In Table I below, a) sodium represents Cg ^n-n-alkylbenzenesulfonate; b) polyethylene glycol ether of Cg ^^ - n-alkanol having an average of 8 ethylene oxide groups per c) sodium primarily n-C 6 alkyl sulfate and d) sodium salt of sulfated polyethylene glycol ether of 10 C 2 -N 2 alkanols having an average of 3 ethylene oxide groups per mole kyle.

TABLE I

Component Examples Comparison Ex.

15 __

1 2 3 4 5678 ABC

Composition, weight percent a) 58.7 57.3 55.7 54.3 60 60 60 60 80 70 60 b) 19.5 19.1 18.6 18.1 20 20 20 20 000 20 c) 2.3 4 , 5 7.1 9.5 5 10 15 20 20 30 40 d) 19.5 19.1 18.6 18.1 15 10 5 0 0 0 0 J active detergent component calculated on the total amount of active detergent components.

6 DK 168219 B1 TABLE I (continued)

Component Examples Comparison Ex.

5 1234 5 6 7 8 A BC

Active de- Viscosity in centistoke at 20 ° C

tergent, weight percent 10 37 830 880 910 960 800 720 670 610 ** 1290 35 940 970 970 1030 840 760 660 590 2720 1790 630 30 1030 980 910 860 840 650 510 380 610 300 99

Transparency point, ° C

37 +3 +2 +2 +3 +2 +2 +2 +4 ^^ +10 15 35 +1 +1 +2 +2 +1 +1 +2 +3 +10 +9 +8 30 +1 +1 +1 +1 +1 +1 +1 +2 +8 +8 +8 • & Λ 'heterogeneous mixture EXAMPLES 9-12 20 Four detergent concentrates were prepared by mixing at room temperature of water and the components listed in Table II. Component (a) contained the sodium salt of "DOBANIC ACID" ®. The intermediate used for its preparation, Cg ^ g alkylbenzene, was prepared by alkylation of benzene with a mixture of linear C „. "Olefins with 25 essentially non-terminal carbon-carbon double bonds. Components b), c) and d) were the same as used in Examples 1-8. From each of these concentrates, three dilute aqueous solutions containing 37, 35 and 30% by weight of active detergent were prepared. On each of the solutions thus formed, the viscosity was measured in 30 centistokes at 20 ° C and the transparency point was determined on how this was done on the solutions as such and after the addition of 0.2 and 0.4% by weight MgSO the diluted solution. Table II shows the results obtained. It can be seen that the viscosity drop in the diluted solutions was significantly reduced, especially in the solutions to which MgSO4 was added. In addition, a low transparency point could be observed.

TABLE II

Compo- Examples nenter 10 ____ 9 10 11 12. *)

Composition, weight percent a) 60 60 60 60 b) 20 20 10 15 15 c) 10 20 20 15 d) 10 0 10 10

Active viscosity in centistokes at 20 ° C after addition of MgSO4, weight percent gent, 20 weight percent 0 0.2 0.4 0 0.2 0.4 0 0.2 0.4 0 0.2 0.4 37 630 520 450 540 470 410 1140 990 880 820 670 600 35 670 540 470 530 470 410 1000 770 830 820 690 600 25 30 570 500 460 360 350 330 400 440 460 510 490 490.

Transparency point, "C, after addition of MgSO4, weight percent 37 +2 +2 +1 +5 +5 +4 +6 +6 +6 +4 +5 +6 35 +2 +2 +2 +4 +4 +4 +5 +4 +5 +3 +2 +4 30 +1 +2 +1 +2 +3 +4 +4 +4 +4 +3 +2 +3 30 ___________ j * - \

'Calculated as in Table I

Claims (12)

An aqueous detergent concentrate, characterized in that it contains, in addition to water, an active detergent comprising the following components: 5 a) 50-70% by weight of one or more salts of an alkylaryl-sulfonic acid, b) 5-30% by weight of one or multiple polyethylene glycol ethers of primary or secondary alcohols of the general formula R (OC2H2) n0H, where R represents an alkyl group of 8-18 carbon atoms, and n represents an integer of 5 to 12, and c) 0.1-25% by weight of one or more salts of sulfated alcohols having 6-16 carbon atoms per molecule. Detergent concentrate according to claim 1, characterized in that component a) consists of one or more salts of an alkylbenzenesulfonic acid. Detergent concentrate according to claim 1 or 2, characterized in that the alkylbenzenesulfonic acid contains 8-16 carbon atoms in the alkyl group. Detergent concentrate according to any one of claims 1-3, characterized in that the active detergent also contains a component d) consisting of one or more salts of sulfated alcohol ethoxylates and / or of sulfated alkyl phenol ethoxylates. Detergent concentrate according to claim 4, characterized in that component d) is a salt of sulfated ethoxylate of C Cg g alkanols. Detergent concentrate according to claim 4 or 5, characterized in that component d) is a sulfate of an alcohol ethoxylate prepared by reacting 1 mole of an alcohol with 1-15 moles of ethylene oxide. DK 168219 B1 Detergent concentrate according to any one of claims 1-6, characterized in that the salts in components a), c) and d) are alkali metal salts, ammonium salts and / or amine salts. Detergent concentrate according to any one of claims 1-7, 5, characterized in that it contains at least 10% by weight of the active detergent, based on the weight of the concentrate. Detergent concentrate according to claim 4, characterized in that the active detergent also contains I, 5-25% by weight of component d). Detergent concentrate according to any one of claims 4-9, characterized in that the active detergent contains 15-25% by weight of component b), 1-25% by weight of component c) and 5-25% by weight of component d). II. Detergent concentrate according to any one of claims 1-10, characterized in that the alkyl groups present are mainly n-alkyl groups. Detergent concentrate according to any one of claims 1-11, characterized in that the aqueous solution also contains MgSO 4. Detergent concentrate according to claim 12, characterized in that the aqueous solution contains 0.05-10% by weight MgSO4, based on the weight of the solution.