JPH03504612A - Foam-inhibiting alkyl polyglycol ether for detergents (2) - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Foam-inhibiting alkyl polyglycol ether (I) for detergents Group closed (Endgruppenverschlossen) polyethylene glycol The present invention relates to the use of coal ethers as anti-foam additives in low-foaming detergents. Book This novel auxiliary agent of the invention is particularly useful in cleaning processes involving intense foaming, e.g. In machine dishwashing for domestic and public use, or for example in the beverage industry It is also intended to be suitable for suppressing unwanted foaming in the machine cleaning of bottles. It is.

Aqueous detergents for public and commercial use, especially for metals, glass, ceramics and plastics. Detergents for cleaning the surface of sticks can usually suppress unwanted foaming. Contains compounds that is most often foam generated from food, for example when washing dishes. or from label removal and decomposition with sodium hydroxide during bottle cleaning. Various types of dirt that dissociate from the substrate and accumulate in the cleaning bath act as foaming agents. Due to the fact that it works, the use of antifoam additives is necessary. In addition, detergent formulations The body commonly contains ingredients that cause undesirable foaming under certain conditions of use, e.g. in detergents. Due to the fact that it contains the anionic surfactant used in It may be necessary to use

Alkylene oxide adducts of organic compounds with reactive hydrogen atoms in their molecules are It has long been used favorably as a foam additive. Particularly good results were obtained with aliphatic polyhydric of alcohol (e.g. West German Patent No. 1280445 and West German Patent No. 16215) 92), and of aliphatic polyamines (for example, German Patent No. 1289597). and West German Patent No. 1621593), propylene oxide adducts, and fats. Aliphatic polyamines, especially ethylene diamine, ethylene oxide and propylene oxide Actually obtained by oxide adduct (see West German Patent No. 1944569) . In addition to their favorable foam-inhibiting effects, alkylene oxide adducts such as these have Alkaline stability typically required for use in communal and industrial detergents It also shows. Unfortunately, this type of compound is prohibited by law in detergent legislation. Not sufficiently biodegradable to meet specific standards.

A type of foam suppressant that is both highly effective and biodegradable is disclosed in West German Published Patent Application No. 3 No. 315951, and the West German published patent discloses the formula (I): R+ O(CH*CH! O)n Rt [in the formula, R1 is a straight chain or branched C, -C1, alkyl or alkenyl group, R1 is C 4Cm alkyl group, and n is a number from 7 to 12 represents. Ko The present invention relates to the use of end group-capped polyalkylene glycol ethers shown in the following.

Substituent R3 is a C1t-C11 fatty alcohol group, R1 is an n-butyl group, and n Products of this type, which are 0 months old, are particularly preferably used in practice.

The teachings of the present invention apply to the aforementioned end group closed fatty alcohol polyethylene glycol ethers. By slightly changing the structure of the foam, foam suppressors such as those addressed by the present invention can be produced. Based on the surprising finding that something more effective can be obtained. Book According to the invention, this also comes at the expense of the physiological acceptability and biodegradability of the anti-foam additive. Not only is it possible to increase the overall effectiveness without Improved ethylene glycol ethers that can be used, inter alia, at low temperatures, i.e. Shows improved action at room temperature or slightly elevated temperatures.

This is a significant advance over known suds control additives. Food in public facilities Washing of utensils should especially be carried out at low temperatures, e.g. for energy-saving pre-washing. It is known that there must be

Traditionally, foam control additives are very effective at foaming at temperatures of about 50°C and above. is often characterized by the fact that it prevents is less effective in this respect.

Surprisingly, the additives of the invention described below are particularly effective at low temperatures, as well as It was found that this property is also exhibited when mixed with a known compound having the structure .

Therefore, the present invention provides general formula (I): Fl　　　　　(CHt　CHt　O)n　Rt　　　　　　(1 ) [in the formula, R8 is a linear or branched Cs C14 alkyl or alkenyl group, R2 is C, -C,, alkyl group, and n is a number from 2 to 8 represents. ] Polyethylene glycol ether shown as a foam-inhibiting additive for low-foaming detergents. Regarding the use of In embodiments where R, is C, alkyl, n is a number from 2 to 6. It is.

Preferred compounds represented by the general formula (1) include the above-mentioned compounds having 8 to IO carbon atoms. It has such a substituent R1. Preferred substituents R1 for L1 in the compounds of the present invention are: Decyl group, especially n-decyl group. Preferred value of n in general formula (I) is from 2 to 6, especially from 4 to 6.

Regarding the compound of similar structure according to DE 33 15 951, the present invention The main improvement of the polyethylene glycol ether of general formula (1) is that the substituent R It consists in two changes. According to the invention, this substituent is similar to the previously described substituents. It has many carbon atoms, namely at least 8 carbon atoms.

The terminal group-closed fatty alcohol polyglycol ether represented by formula (1) is Prepared according to Published Patent No. 3,315,951. That is, a higher number of carbon atoms The fatty alcohol is reacted with ethylene oxide in a molar ratio of 1=2 to 1:8. The hydroxyl groups present in the resulting reaction product are then converted into ethers. become The reaction with ethylene oxide is preferably carried out under known alkoxylation conditions. This occurs in the presence of a suitable alkaline catalyst. Etherification of free hydroxyl groups or using a branched C, -C, alkyl halide, known Williamson According to the present invention, in the general formula (1), it is preferably carried out under the conditions of ether synthesis. Among the substituents R and hl, a particularly important one is the n-decyl group. Therefore, the last An example of an etherification step is n-decyl halide, such as n-decyl iodide. . However, the present invention is not limited to n-decyl iodide, but for example n-decyl chloride. -octyl, 2-ethylhexyl chloride, n-nonyl chloride, isononyl chloride and It can also be carried out using n-decyl chloride.

Alkyl halides and alkalis are used in stoichiometric amounts relative to the hydroxyl group to be etherified. Logically, it is best to use an excess of, for example, 10 to 50%.

In a preferred embodiment of the present invention, it is represented by formula (1), where n is a number from 4 to 6. Use polyglycol ether.

In one important embodiment, the end group-capped polyglycol ether of formula (I) Co, C+s, having the same structure, but with the substituent R, being linear or branched. alkyl or alkenyl group, where n is a number from 7 to 12, preferably from 8 to IO. Used by mixing with polyethylene glycol ether. Therefore, this invention In an embodiment, the polyglycol ether is Mix with No. 1 anti-foam additive. The mixing ratio of the two types of compounds is 10:90 to 90:10 A range of 60:40 to 40:60 wt.% is suitable for this embodiment. A weight ratio of % is particularly suitable. One application of this kind of mixture is for example bottle machine washing. In cleaning detergents or dairy detergents.

End group-capped polyglycol ether of formula (1) used according to the present invention It is also characterized by high alkali and acid stability. As mentioned above The anti-foaming effect in alkaline and neutral detergent solutions is enhanced; , also meets legal standards for biodegradability.

Other applications of the end group-capped polyglycol ether of formula (1) according to the invention is, for example, a liquid or powder for mechanical dishwashing at home or in public facilities. This is true for detergents in powder form. Such substances, when used in powdered detergents, It also has the effect of acting as a quenching agent, in which case it also has the effect of acting as a powder storage agent. Prevents powder particles from clumping and caking during storage, thus giving the powder good flowability On the other hand, it can bind the dust generated by friction when the powder moves. can.

The end group-capped polyglycol ether represented by formula (1) according to the present invention is -, consisting of alkali metal carbonates and silicates, stirred and therefore well mixed The dried solid granule ingredients are then sprayed under controlled conditions. As a granulator, Ledige ( Loedige and Eilrich mixers may be used.

Detergents using end group-capped polyglycol ethers of the present invention are commonly used in detergents. ingredients such as wetting agents, building blocks and complexing agents, alkalis or acids, corrosion inhibitors, etc. It may contain a blocking agent and, if necessary, an organic solvent. Suitable wetting agents include nonionic surfactants. sexual agents, such as alcohol, especially fatty alcohols, alkylphenols, fats Obtained by adding ethylene oxide to amines and carboxylic acid amides. polyglycol ethers, as well as anionic wetting agents such as fatty acids, alkyl alkali metal sulfuric acid, alkyl sulfonic acid and alkylbenzene sulfonic acid , amines and alkylolamine salts. Bilgoo present in detergents and Complexing agents are inter alia alkali metal orthophosphates, polymer phosphates, Silicates, borates, carbonates, polyacrylates and gluconates and citric acid, nitrilotriacetic acid, ethylenediaminetetraacetic acid, 2-hydroxyalkyl Can-1,1-diphosphonic acid and ethylenediaminetetra(methylenephosphonic acid) (acid), phosphonoalkane polycarboxylic acids, e.g. phosphonobutane tricarboxylic acid) acids, and alkali metal salts of these acids. Strong alkaline detergent, Tori Bottle cleaning detergents contain caustic acids in the form of sodium and/or potassium hydroxide. Contains a large amount of Lucari. If special cleaning effects are required, detergents may be solvents, such as alcohols, gasoline fractions and chlorinated hydrocarbons as well as free May contain alkylolamines.

In the present invention, detergents are defined on the one hand as being applied directly to the substrate to be treated; Aqueous solutions intended, on the other hand, concentrates and solutions intended for the preparation of working solutions. It is understood to be a solid mixture.

The ready-to-use solution may be acidic or strongly alkaline, typically at a temperature in the range of 20 to 90°C. used in degrees.

In the examples below, additives selected according to the invention and, for comparison, Regarding additives having a similar structure outside the scope of the invention, by the method described below. , the anti-foaming effect was tested: Method 1 A 1% by weight aqueous solution of sodium hydroxide 300112 was added to a double walled 212 graduated cylinder. - Keep at 20℃. To this solution, add the selected specific anti-foam additive in the amounts listed below. Ru. A laboratory perturbation pump circulates the liquid at a rate of 412/min. test The solution was poured into a glass tube with a length of 55c+a (inner diameter 8, 511L outer diameter 11mm), approximately 5mm above the bottom of the graduated cylinder. Suction it with 2 by free fall through a glass tube (length 20 cm).

After 30 seconds, the triethanolamine salt of tetrapropylene benzene sulfonate 1% aqueous solution (referred to as "test blowing agent J" in the table below) 1 x (l is solution and after a further 30 seconds the volume formed by the liquid and foam is measured. next Add another 1i12 of the test blowing agent at 1 minute intervals, and after 30 seconds the liquid formed Measure the body and foam volumes. Add the test blowing agent and measure the volume after 30 seconds. This step-by-step cycle means that the surfactant solution foams at 200 ml of the graduated cylinder. Continue until the 01ρ scale is reached.

The end-capped polyglycol ethers used according to the invention are effective even at low concentrations. is large. Such compounds have concentrations of about 50 to 500 ppm in ready-to-use solutions. It is preferable to add it to the detergent in an amount that falls within the range of m.

Example 1 CsH+y-(QC)(tcH*)*0-Cr. H2, = product A and rich C++/+aHss/5y-(OCH heavy CH box o-OC4HI = product B test Test blowing agent (1ρ) Product A Product B13 500 ! , 08014 520 1.40015 540 1.74016 580 2.00025 1.020 26 1.300 27 1.640 28 2.000 Method 2 The suds-inhibiting effect of products A and B was also determined by the following method: detergent solution of 1e. was prepared; it consisted of 4 g of whipped whole eggs (egg white + egg yolk), composition: Sodium metasilicate (anhydride) 500g tripolyphosphoric acid Pentasodium hexahydrate 370g Sodium carbonate anhydrous 70g water glass in 120g water (Nag:S 1os= 1:33) 80g trichloroisocyanuric acid 10g dishwashing detergent 3g and product A (Example 1) or product B (Comparative Example 1) 0.5g is contained in 992.5g of water with a hardness of 16°Gh. detergent solution 450zR, then put it into a double-walled graduated cylinder with a volume of 112000xQ. The mixture was heated to 20°C in a vacuum chamber. The bottom of the graduated cylinder of the laboratory pump I. The solution was sucked out through a glass tube. The lower end is located at the upper end of the graduated cylinder. The liquid was returned to the graduated cylinder through a second tube. liquid at a rate of 412/min Circulate it with the pump and drop it back into the graduated cylinder. This pump circulation of liquid As a result, bubbles are generated. 112.3.4.5.7 and after 10 minutes of pump circulation , read the volume formed by the foam and liquid after these times.

Time rI! J (minutes) Product A Product B International search report Turbidity survey report

Claims (3)

[Claims] 1. General formula (I): R1O-(CH2CH2O)n-R2(I) [wherein, R1 is a straight chain or branched C■-C14 alkyl or alkenyl group, R2 is C ■-C10 alkyl group, and n is a number from 2 to 8 and when R2 is a C■ alkyl group, n is a number from 2 to 6. ] Use of polyethylene glycol ether as anti-foaming additive for low-foaming detergents On the way. 2. R1 is a C■-C10 group as described above, n is a number of 2 to 6, especially 4 to 6, and and R2 is preferably a decyl group, especially an n-decyl group; The use according to claim 1, characterized in that a compound is used. 3. A compound represented by general formula (I) has a similar structure, but R1 is a straight chain or is a branched C■-C16 alkyl or alkenyl group, R2 is a C4-C■ alkyl group. a polyethylene glycol ether, and n is a number from 7 to 12. The use according to claim 1 or 2, characterized in that it is used as a product.