JPH01201581A - Hygienic treatment of textile product - Google Patents

Abstract

PURPOSE:To afford textile products with anti-fungus and bacterial capability excellent in resistance to washing without adverse effects on their appearance and feel, by carrying a specific alkylamine alkylphosphate on the original textile products. CONSTITUTION:The objective treatment can be accomplished by applying on textile products an alkyldimethylamine (e.g., octyldimethylamine, decyldimethylamine) alkylphosphate in the form of an organic solvent solution followed by drying. Preferably, heat treatment after the above-mentioned treat ment will further improve the resistance to washing. The amount of said anti- fungus agent to be carried is pref. such as to be 0.1-3wt.% based on the weight of the textile product.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a sanitary treatment method for imparting wash-resistant, antibacterial and antifungal properties to textile products.

[Prior art and problems to be solved by the invention] Textile products that are used by an unspecified number of people, such as wet towels, sheets, pillowcases, yukatas, and rental diapers, that are washed after use and used again. Demand for things is increasing. In addition, the number of companies that carry out this cleaning work as a business is increasing. However, there are many cases where the sanitary conditions of products after cleaning are not always sufficient.

In particular, towels are used in large quantities by service organizations such as the restaurant industry, inns, hotels, and passenger transportation, and millions of towels are rented out every day across the country. Since wet towels are stored in a wet state and used for wiping hands and faces, incomplete sterilization during cleaning is particularly problematic. For this reason, in 1981, the Ministry of Health and Welfare issued a ring
No. 7 (November 16, 1981) "Guidance Standards for Hygienic Treatment of Wet Clothes" has been published, but there are large differences in the degree of soiling of towels due to use, so sterilization treatment has been strengthened. However, the odor may remain, the lifespan of the wet towels may be shortened, or the costs required for disposal may increase, resulting in a decline in the profitability of the company. Furthermore, due to reasons such as insufficient monitoring due to the large number of fingers used, the current situation is that the above-mentioned finger W standard is not always fully complied with.

Patent Publication No. 61-502058 has 8 to 18 carbon atoms.
Although an invention has been disclosed in which an addition salt of an amine having an alkyl group and a dialkyl group having 4 to 18 carbon atoms and an alkyl phosphoric acid is used for fiber treatment, the bactericidal activity of this addition salt is not sufficient.

In addition, the patent publication 1986-61 by the same inventor as the invention in the above-mentioned publication
No. 43,470 discloses treating carpets with dialkyl phosphate addition salts of alkyl jetanolamines to impart germicidal properties. Among these phosphates, diethyl phosphoric acid addition salt of lauryl jetanolamine is said to be the most preferred. However, lower alkyl phosphates of lauryl jetanolamine are soluble in water and are not suitable as antibacterial agents for textile products that require wash resistance.

[Means to solve the problem]

The inventors believe that in order to keep the number of viable bacteria in wet towels low after washing, it is necessary to apply an antibacterial agent to the towels that can withstand washing, bleaching, and other treatments, and that even if used with this agent applied, it will not cause any harm to the human body. As a result of research on drugs without this, the present invention was achieved.

In other words, the above problem is solved by using an alkyl phosphate of an alkyl amine represented by the following general formula in a range of 0.1 to 0.1 based on textile products.
This is achieved by the method for sanitation treatment of textile products of the present invention, which is characterized by carrying 3.0% by weight.

CIl, OR.

CIl, + OR.

(In the formula, R1 is an alkyl group having 8 to 20 carbon atoms, and R
2 is an alkyl group having 6 to 10 carbon atoms, and R3 is a hydrogen atom or an alkyl group having 6 to 10 carbon atoms. ) Specific examples of alkyl phosphates of alkyldimethylamine used in the method of the present invention include octyldimethylamine,
Mono- or diakyl phosphoric acid, mono- or dioctyl phosphoric acid, mono- or dioctyl phosphoric acid, of an alkyldimethylamine selected from decyldimethylamine, lauryldimethylamine, myristyldimethylamine, palmityldimethylamine and stearyldimethylamine;
Addition salts with mono- or dialkyl phosphoric acids such as mono- or di(2-ethylhexyl) phosphoric acid, mono- or dinonyl phosphoric acid or mono- or didecyl phosphoric acid may be mentioned.

The alkyl phosphoric acid addition salt of alkyldimethylamine used in the present invention can be easily obtained by the following method.

That is, equal moles of alkyl dimethylamine and mono- or dialkyl phosphoric acid are mixed at room temperature without a solvent and heated to 60 to 70°C. The temperature drops after about 20 minutes. If the mixture of alkyl dimethylamine and mono- or dialkyl phosphoric acid is maintained at 60 to 70°C for about 30 minutes or more, the reaction is carried out quantitatively and the desired product is obtained.

The mono- or dialkyl phosphate of the alkyldimethylamine represented by the above general formula used in the method of the present invention is insoluble in water. Therefore, in order to support this alkyl phosphate of alkyldimethylamine on textile products, a method is adopted in which it is applied to the textile product in the form of an organic solvent solution and the solvent is removed. In order to apply it to textile products, methods such as spraying an organic solvent solution onto the textile product, or padding the textile product by passing it through an organic solvent solution can be adopted. That is, the concentration 1.0 dissolved in isopropanol or methanol
What is necessary is to spray or pad with an organic solvent solution of about 10% by weight, and then dry it. 70-120 after drying
Washing resistance is further improved by heat treatment at a temperature of 10 to 60 minutes.

In the present invention, the amount of the alkyl phosphate of alkyldimethylamine supported on the fiber is preferably 0.1 to 3.0% by weight based on the weight of the textile product.

If it is less than 0.1% by weight, satisfactory antibacterial/antifungal activity cannot be obtained, and if it exceeds 3.0% by weight, the textile product will feel slightly slimy.

Examples of the textile products to be treated in the present invention include textile products that are repeatedly washed and used, such as wet towels, sheets, pillow cases, yukatas, and rental diapers.

Due to the antibacterial and antifungal activity of the alkyl phosphate of alkyldimethylamine supported on textile products, the growth of dirt containing bacteria and mold is inhibited even if it adheres to the fabric. It does not easily come off when washed, and is resistant to oxidizing bleach, which is commonly used to wash wet towels. Therefore, the antibacterial and antifungal activity of the alkyl phosphate of the alkyl dimethylamine lasts for a long time. Since dead bacteria and spores are removed under normal washing conditions, textile products can be used repeatedly while maintaining low levels of bacteria and mold. The alkyl phosphate of the alkyldimethylamine mentioned above has remarkable activity against Durum-positive bacteria and mold, but is somewhat weak against Durum-negative bacteria. However, by applying an oxidizing agent during washing, Durham-negative bacteria can be completely removed.

〔Example〕

The present invention will be specifically described below with reference to Examples.

Lauryldimethylamine 24.1 g (0.1 mol
) was placed in a three-wall flask equipped with a stirring device, then 32.2 g of di(2-ethylhexyl) phosphoric acid was added, and 70 g of di(2-ethylhexyl) phosphoric acid was added.
The mixture was stirred for 60 minutes at a temperature of .degree. C. to obtain added salt. This salted product is a brown transparent viscous liquid with a viscosity of 300 cp (20° C.) and is insoluble in water.

Add 2 g of the above addition salt to ethanol lQmj! A stock solution was obtained by dissolving the stock solution, from which a 2-fold dilution series of sample solutions was prepared using ethanol.

After dispensing 0.5 mj+ of the sample solution into a sterilized petri dish, sterilize it and keep it at about 50°C on Trypto Sawyer agar medium (Japanese type).
9.5 m/m was dispensed, mixed uniformly and solidified to form a flat plate for measuring antibacterial activity.

Separately, after dispensing 0.5 ml of the sample solution into a sterilized Petri dish, 9.5 ml of sterilized potato dextrose agar medium (Japanese type) kept at about 50°C was dispensed and mixed uniformly.
It was solidified to form a flat plate for measuring antifungal activity.

An inoculum solution for antibacterial activity measurement was prepared by transplanting three platinum loops of the test bacteria from the slant into 4 ml of sterilized physiological saline and thoroughly dispersing them.

Further, 5 mff of sterilized water containing 0.005% dioctyl sodium sulfosuccinate was poured into the slant of the test bacteria to disperse the spores. The spore dispersion liquid was filtered using gauze and used as an inoculum liquid for measuring antifungal activity.

The bacterial strains used were as follows.

Staphylococcus aureus
reus F ^209p) Bacillus subtilis
5ubtilis IPO3007) Escherichia coli (t!5
cherichia coli IFO3301) Pseudomonas aeruginosa
IFO3445) Aspergillus
s niger ATCC6275) Aureobasidium pullulans
The inoculum solution was inoculated onto the prepared flat plate using a platinum loop.

The plates inoculated with bacteria were cultured at 37°C for 48 hours, and the plates inoculated with mold were cultured at 30°C for 7 days, and then the presence or absence of bacterial growth was observed. The observation results were evaluated as the lowest concentration at which no bacterial growth was observed, that is, the minimum growth inhibition rate (MIC). The results were as follows.

(1) Antibacterial activity Durham-positive bacteria Staphylococcus aureus (FDA 209p) ≦39ppm
Bacillus subtilis (IFO3007) ≦78ppm Durham negative bacterium E. coli (IFO3301) >10.000p
pm Pseudomonas aeruginosa (IFO3445) >10,0
00ppm (2) Antifungal active black koji mold (^TCC6275) ≦39p
pm Aureobasidium pullulans ≦; (9ppm
Added salt 2.0, an antibacterial/antifungal agent prepared in Example 1
30.0 g of 2.0% anti-width/anti-mold processing impregnating liquid, in which g is dissolved in 98.0 g of 50% by weight isopropyl alcohol.
Each cotton wet towel was impregnated with 20.0 g of the product, air-dried, and added with a base amount of 3.0%. Furthermore, after heat setting at a temperature of 80°C for 10 minutes, the following sodium chlorate 1. 0g to 500
Soak in a disinfectant solution added to 20g of water and remove the liquid until the disinfectant solution reaches 20.
It was made into a processed wet towel with Og attached. Next, the hands and fingers were washed with physiological saline containing Escherichia coli, Staphylococcus aureus, Bacillus subtilis, Pseudomonas aeruginosa, and Aspergillus niger, and a bacterial solution containing common bacteria was prepared. Add 1ml of this bacterial solution to the above-mentioned processed wet towel,
After being left at 7°C for 48 hours, it was washed under the following conditions.

Add 0.5 g of neutral non-ionic detergent with 22% active ingredient to 10 kg of water, and wash the mixture thoroughly at 60°C using a Toshiba household washing machine Galaxy (Model Vll-1315) under inverted agitation conditions. Washed and dehydrated.

Next, it was rinsed with 10 kg of water for 3 minutes and dehydrated. After repeating this rinsing twice, further rinsing is performed using an aqueous solution containing 250 ppm or more of free chlorine to which 20 g of sodium hypochlorite with an effective chlorine concentration of 13.0% is added, followed by dehydration. The wet towels were recycled by repeating the rinsing method using an aqueous sodium chlorite solution and dehydration. Again, 1m7 of bacterial liquid! was added and left at 37℃ for 48 hours, washed as described above, and recycled the wet towel 50 times.
Evaluation was made based on No. 7). The results are shown in Table-1.

Comparative Example 1 Without adding salt, which is an antibacterial/antifungal agent prepared in Example 1, to a wet towel, the wet towel was immersed in the disinfectant solution used in Example 2, and the liquid was removed until the disinfectant solution was 20. Wet towels with Og adhering to them were prepared, and the same recycling and processing tests as in the examples were conducted, and the results shown in Table 2 were obtained. As shown in the table, the number of general bacteria was as high as 2.0 x 10' per sheet, and black mold was also observed.

Example 3 1, in which 1.0 g of added salt prepared in Example 1 was dissolved in 99.0 g of isopropyl alcohol (50% aqueous solution),
A 0% antibacterial/antifungal processing liquid was prepared. Is this made by j1M? &
3 og of salt was spray applied to 60 g/rd of polyester fiber, air-dried, and then heat set at 80° C. for 60 minutes to obtain processed fibers to which 0.3 g/rd of salt was added. Next, a physiological saline bacterial solution containing Koji niger, Staphylococcus aureus, and Bacillus subtilis was applied to the polyester processed fiber at 1 m1/rr.
After spraying on the fabric and leaving it at 37°C for 48 hours, it was washed under the following conditions.

0.5 g of a neutral nonionic detergent containing 22% active ingredients was added to 10 kg of water, washed at a temperature of 60° C. for 10 minutes (same washing conditions as in the example), and dehydrated.

Next, it was rinsed with 10 kg of water for 3 minutes and dehydrated. After repeating this rinsing twice, the fibers were dehydrated and dried to obtain recycled fibers. Once again, the bacterial solution was left on the raw processed fibers for 48 hours at 1 mβ/mβ/Respray °C, and the above washing was repeated 10 times to evaluate the antibacterial and antifungal properties.

The results are shown in Table-3.

Table 3 [Effects of the invention] The method of the present invention can be applied to textile products that are used by an unspecified number of people and are cleaned and reused after each use, such as rental towels, sheets, pillow cases, yukatas, rental diapers, etc. It is highly useful as a sanitary processing method. By supporting an alkyl phosphoric acid addition salt of a specific alkyldimethylamine, it is possible to easily reduce the level of bacteria and mold before reuse of textile products, with almost no effect on the appearance and texture of the textile products. It can be easily kept below the acceptable standard value. Furthermore, the alkyl phosphoric acid addition salt supported on the textile product does not easily fall off even when washed, and its antibacterial and antifungal activity persists for a long period of time.

Claims (1)

[Scope of Claims] 1. A sanitary treatment method for textile products, which comprises carrying an alkyl phosphate of an alkylamine represented by the following general formula in an amount of 0.1 to 3.0% by weight based on the textile product. ▲There are mathematical formulas, chemical formulas, tables, etc.▼ (In the formula, R_1 is an alkyl group with 8 to 20 carbon atoms,
R_2 is an alkyl group having 6 to 10 carbon atoms, and R_3 is a hydrogen atom or an alkyl group having 6 to 10 carbon atoms. )