DE1812054A1 - Process for the simultaneous cleaning and disinfection of textiles - Google Patents

Description

Patent Department Düsseldorf, November 29, 1968

Dr. Gla / Gu Henkelstr. 67

Patent application D 3684

"Process for the simultaneous cleaning and disinfection of textiles"

The invention relates to an improved method for the simultaneous cleaning and disinfection of textiles in cleaning liquors based on organic solvents with a low water content.

Washing and washing carried out in aqueous alkaline solutions. Cleaning processes generally produce textiles that do not only cleaned, but also germ-free at the same time. Long treatment times at nearby temperatures the boiling point and certain chemicals contained in the detergents cause a reliable Disinfection of the laundry. In contrast, dry cleaning processes are not inherently disinfectant. The solvents used, such as chlorinated hydrocarbons or heavy fuel, are namely neither alone, nor with the addition of the usual cleaning enhancers, during a to bring about a sufficient germ reduction within a reasonable duration of treatment. As a result, the dry cleaning processes deliver Although macroscopically perfect textiles, they do not lead to any microbiological ones Redevelopment. As the cleaning liquors are used repeatedly

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there is also the risk that germs from previously cleaned items will be carried over to later cleaning batches and thus new chains of infection can arise. The poor disinfection In such cleaning liquors, special attention should be paid to the dry cleaning of items of clothing, woolen blankets and others Textiles from hospitals, hotels and communal accommodation.

It has already been proposed to improve the hygienic conditions in dry cleaning been to couple the cleaning process with a disinfection. The most commonly used procedure is carried out with the addition of formaldehyde to the organic solvents, but requires An aftertreatment because of the pungent odor that adheres to the textiles after cleaning in an ammonia bath. In practice, however, it has been found that even when performing this ^ Post-treatment cannot always avoid subsequent odor nuisance. Other disadvantages of this Procedures are in the additional work and time expenditure of the aftertreatment and in the increased wear and tear of the textiles as a result of additional mechanical stress.

Condensation products of aldehydes and aliphatic amines or oxyalkylamines are known disinfectant and Preservatives. For example, in the German

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Auslegeschrift 1 148 70β the use of condensation products aliphatic aldehydes with primary or secondary aliphatic oxyalkylamines for the disinfection and preservation of aqueous technical solutions and emulsions, for example Drilling oils.

Surprisingly, it has now been found that of the above-mentioned disinfectants and preservatives - the condensation product from equimolar amounts Formaldehyde and aminoethanol in the organic commonly used in dry cleaning Solvents have a much stronger germ-reducing effect than in an aqueous medium. Further became an improved process for the simultaneous cleaning and disinfection of textiles in cleaning liquors based on organic solvents with a low water content. found. the The new way of working is free from the above-described disadvantages of the known methods for disinfecting Dry cleaning and is characterized in that the cleaning liquors known per se the condensation product of equimolar amounts of formaldehyde and aminoethanol as a disinfectant is added.

For the representation of the formaldehyde-aminoethanol condensation product become, for example, 8lC g

Yl wt .- ^ iger formalin solution (10 mol formaldehyde) was added with stirring and cooling 65O g (10.5 mol) of ethanolamine. The addition takes place so slowly that the temperature of the reaction mixture does not reach 60.degree

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exceeds. Then stir for another hour. This gives a ready-to-use 52.7% by weight solution of the active ingredient. The pure condensation product can be obtained from the reaction mixture by fractional distillation. It is at 74-76 ° C. under a pressure of 0.01 torr over and has the refractive index n ^ 1.5-156 · The production of the formaldehyde-aminoethanol condensation product is not the subject of this claim. , report. _: ·

The condensation product of equimolar amounts of formaldehyde and Aminoethanol is used in the cleaning fleets a concentration of 0.01-1.0 g / l / preferably 0.1-0.5 g / l, added.

In order to improve the cleaning effect, generally known cleaning agents based on anionic and non-functional surface-active compounds are added to the cleaning liquors, for example higher molecular _{alkyl sulfonates with a chain length of C 12} to C ₂₂ , petroleum sulfonates, alkyl benzene sulfonates, the alkyl chains of which are 8 to 14 Have carbon atoms, preferably dodecylbenzenesulfonate, also fatty alcohol sulfates, fatty acid alkanolamides, ethylene oxide and propylene oxide adducts with higher molecular weight, active water "." Compounds containing hydrogen atoms, such as fatty alcohols with a chain length of C ₁₂ to C ₁ Q, fatty amines with a chain length of C ₁₂ to O ₁ Qt, alkylphenols, preferably nonyophenol and the like.

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The cleaning enhancers are usually added to the cleaning liquors in the form of concentrates, which, in addition to the surface-active compound, contain solvents such as chlorinated hydrocarbons or mineral oil, and, if necessary, a solution mediator, for example isopropanol, and water. The condensation product of formaldehyde and aminoethanol can be incorporated into these concentrates and dosed together with the detergent booster will.

When carrying out the method according to the invention, enough water is added to the cleaning liquor that the relative humidity in the steam space above the liquor is at least 70 % during the cleaning process.

In certain cases it has proven to be advantageous to add corrosion inhibitors to the cleaning liquors add, for example, compounds from the series of benzothiazoles to prevent the liquors from attacking the To prevent vessel material from the cleaning systems. If desired, the inhibitors can be added to the cleaning enhancer concentrates are mixed in.

The main components of the cleaning liquors used are the organic ones commonly used in dry cleaning Solvents and mixed solvents such as chlorinated hydrocarbons and gasoline. As a solvent Perchlorethylene, heavy gasoline with a boiling point in the range between

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IAO - 200 ° G and monofluorotrichloromethane.

In practice, the textiles are cleaned in commercially available dry cleaning machines carried out" ·

The process according to the invention using the condensation product of formaldehyde and aminoethanol Textiles cleaned as disinfectants are odorless and show no discoloration. The one in the process The disinfection effected is just as good for pathogenic bacteria as it is for yeast and fungi *,

A major advantage of the formaldehyde-aminoethanol condensation product its use as a disinfectant is the lack of any irritating effect on the Skin. The skin tolerance of the product was compared on a 37% by weight formal solution tested Hairless mice were given a 52 * 7 wt Solution of the formaldehyde-aminoethanol condensation product and a 37% strength by weight formalin solution by brushing applied «The formaldehyde solution already had an effect after two days severe necrotic changes in the skin, while the condensation product of formaldehyde and aminoethanol for a test period of 14 days was tolerated without irritation »

The following experiments explain the increased microbiological activity of the condensation product from equimolar Quantities of formaldehyde and aminoethanol in organic solvents compared to its effectiveness in aqueous solution * and the practical implementation of the process according to the invention. - -

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-τι. Laboratory tests A: Bactericidal activity in perchlorethylene

1 cm large sterile wool cloths (weight: 550 g / m) were with suspensions of Staphylococcus aureus SG 511 (10 germs / ml), Pseudomonas aeruginosa

(10 ^1Q germs / ml) and Candida albicans (1O ⁷ germs / ml)

infected and then dried at 30 ° C.

The disinfection experiments were carried out in perchlorethylene liquors carried out, the a) 5 g / l of a commercially available cleaning booster based on petroleum sulfonate and nonylphenol polyglycol ether or b) 5 g / l of the same detergent booster and 0.3 g / l of the above Described formaldehyde-aminoethanol condensation product contained. The infected lobules were in the perchlorethylene liquors kept at 30 ° C introduced and in it IQ or 15 minutes with help moved by a magnetic stirrer. Subsequently, the lobules were used to eliminate any possibly existing rinsed twice with a 0.1% strength by weight sodium sulphite solution.

Part of the lobule infected with bacteria became placed in Merck standard I broth (tube test), the other part was on Merck Standard I Broth Agar laid and covered with the same Nhrboden (plate test). In those infected with Candida albicans The tube test was carried out with wort and the plate test with wort agar. To switch off a bacteriostatic negative effect

ORIGINAL INSPECTED

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the liquid and solid nutrient media each 0.5 -'- wt. -% histidine. The tubes and plates were incubated for 8 days at 37 ° C and then macroscopically examined for growth. »The tube authenticity test results were secured by smears on solid nutrient media» The results obtained with the perchlorethylene liquors a) and b) are shown in Table 1 »Thereafter is sufficient with an addition of 0.3 g / l of the formaldehyde-aminoethanol * condensation product, a residence time of 10 minutes

already from * to germ growth after the treatment to be completely prevented »·

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Table 1

Bactericidal effectiveness of the condensation product from equimolar amounts of formaldehyde and aminoethanol in a perchlorethylene liquor.

Active ingredient concentration: liquor a) ο g / l; Liquor b) 0.3 g / l

Test germ fleet Effect time
10 tube t (minutes)
15th tube Staphylococcus
aureus a
b plate + plate + Pseudomonas
aeruginosa a
b + + + + Candida
albicans a
b + + + + + +

+ = 3 growth

sterile

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ORIGINAL INSPECTED

B. Bactericidal activity in aqueous solution

Determination of bactericidal effectiveness in aqueous Float took place with solutions of formaldehyde = · aminoethanol Condensation product in various concentrations »All solutions contained 5 g / l of the above-mentioned commercially available Cleaning enhancer ο Staphylococcus aureus SG 511 was used as the test germ «

The wool patches were also infected as in carried out with Perchlorathylenflotten Try "You WUR ° stale designed into small Petr! And with 10 ml of the test solution is poured over" after the intended exposure times of 5 * .10, 15, 2O ₅ 50 For 45 and βθ minutes, swabs were removed and rinsed twice with a 0.1% strength by weight sodium sulfite solution. The swabs were then placed in Merck standard I-Boutllon or placed on Merck standard J-BoutLlon agar and mixed with the the same nutrient medium layered "The nutrient medium always contained 0.5 % histidine to eliminate any subsequent inhibitory effect",

The tubes and plates were incubated for 8 days at 37 C and then examined macroscopically for growth. The results of the tube tests were secured by smears on solid culture media. The results shown in Table 2 show that even with an active ingredient concentration of 30 g / l and a treatment time of 60 minutes, the test germ is not killed *

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Table 2

Bactericidal effectiveness of the condensation product from equimolar amounts of formaldehyde and aminoethanol in an aqueous liquor,
Test germ: Staphylococcus aureus.

concentration
g / l Exposure time (minutes) 5 10 15th 20th 50 45 60 20th
25th
50 : : : : : ⁺

growth

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ORIGINAL INSPECTED

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2. Experiments in a dry cleaning plant

The practical tests were carried out in a Chemisch ™ cleaning system of the usual type (Böwe R 9) carried out.

In four batches, β - 8 kg woolen blankets were produced in each case.

cleans, to which 1 cm infected woolen lobes were attached in gauze bags. The cleaning was carried out in a three-stage single bath process with 100 liters of perchlorethylene as a cleaning agent. In the first batch, the cleaning solution contained only 5 g / l of commercially available cleaning. No disinfectant. 0.3 g / l formaldehyde-aminoethanol condensation product and enough water were added to the same liquor for the second batch so that the relative humidity in the steam space above the liquor was greater than 70 % . To prevent the liquor from becoming depleted in active substance , another 0.1 would g / l * · Desirifektions medium added during the subsequent machine fillings respectively. following the cleaning process, the Textillen were centrifuged for 2 minutes and then dried for 15 minutes at 60 ^Q C.

As in the laboratory tests, the wool rags were brought into nutrient solutions twice with 0.1% strength by weight sodium sulfite solution * or laid out on solid nutrient media and overlaid, incubated for 8 days at 37 ° C and then tested for sterility * The liquid and solid nutrient media again contained 0.5 % histidine *: · » ^{/ v}

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The following microorganisms were used as test germs in these experiments:

1. Staphylococcus aureus SG

2. Escherchia coil

J>. Pseudomonas aeruginosa

4. Mycobacterium phlei

5. Candida albicans and

6. Trichophyte on mentagrophytes

The results obtained are summarized in Table 3. .

The same disinfection results are obtained if the cleaning process is carried out with heavy fuel (bp. 140 - 200 ° C) or monofluorotrichloromethane carried out as a solvent will.

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/Tabel

Microbicidal effect of the condensation product from equimolar amounts of formaldehyde and alcohol ethanol for dry cleaning in a perchlorethylene liquor, . Active ingredient concentration: Charge I O. g / l Charge III supplement 0.1 g / l

Batch II 0.3 g / l Batch I? Postscript 0 ^ 1 g / l

Testkeira Batch I. tube Batch II tube Batch III tube Batch IV tube Staphylococcus aureus
Eseherichia ~ "coli
Pseudomonas aeruginosa
My c obiter ium phlei _;
Candida albicans
Triehophyton
mentagrophy tes plate + ■
-S- plate esa plate it, plate 0 Q DO 0 » -

growth

- = sterile

Claims (8)

Claims 1. Process for simultaneous cleaning and disinfection of textiles in cleaning liquors based on organic solvents with a low Water content, characterized in that the cleaning liquors from the condensation product Equimolar amounts of formaldehyde and aminoethanol is added as a disinfectant. 2. The method according to claim 1, characterized in that the condensation product of equimolar Amount of formaldehyde and aminoethanol in the cleaning liquor in a concentration of 0.01 - 1.0 g / l, preferably 0.1-0.5 g / l »is added. 3. The method according to claim 1 and 2, characterized in that that the cleaning liquors are known cleaning enhancers based on anion-active or non-ionic surface-active compounds contain. 4. The method according to claim 1 to 3, characterized in that the cleaning liquors contain so much water that the relative humidity in the steam space above the liquor is at least 70 % . . "'■■". - 16 - ORIGiNALINSPECTED 0 0 9825/1898 Henkel & Cie GmbH 5 · The method according to claim 1 to 4, characterized in that perchlorethylene as organic Solvent is used » 6. The method according to claim 1 to 4, characterized. that heavy gasoline with a boiling point in the range between 140 and 200 ° C is used as an organic solvent. .., .. " ™ 7. The method according to claim 1 to 4, characterized in that that monofluorotrichloromethane is used as the organic solvent. 8. Active ingredient concentrate for the simultaneous cleaning and disinfection of textiles according to claim i to 7 *, characterized in that there are 40-60 anionic and / or non-ionic. surface-active compounds, from 5 to 20 wt -. *% of Kondensationspröduktes of equimolar amounts of formaldehyde and aminoethanol, 10 - 15 wt .- ^ isopropanol as the solubilizing agent, 10 - 20 wt .- # water and optionally t0.5 - 2 wt Jo contains corrosion inhibitor, the remainder mineral oil or chlorinated hydrocarbons as solvents. H e η k e 1 & C i e. GmbH · • p. JL (Dr . Haas) (Dr. Amoiläy / f 0098 25/1898