JPH0718563A - Method for washing fiber containing oil for cleaning - Google Patents

Abstract

PURPOSE:To remarkably simplify a washing step excellent in washing effects with hardly any damage to fiber by subjecting the fiber containing an oil for cleaning to washing of two stages with an organic solvent and water. CONSTITUTION:Fiber, containing a mineral or a vegetable oil and used for cleaning (the so-called chemical swabbing cloth) is washed and regenerated. In the process, this method for washing the fiber is carried out by initially subjecting the fiber to, e.g. ultrasonic washing with an organic solvent (e.g. alcohols, halogenated hydrocarbons, ethers or petroleum-based hydrocarbons), removing adsorbed oils and organic dirts and subsequently combining the removal of the adsorbed oils and organic dirts with the removal of inorganic dirts by usual water-based washing (a washing liquid containing a detergent, an alkaline agent and a surfactant). Thereby, washing effects are improved to enable the simplified washing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for cleaning oil-containing fibers for cleaning.

In the present specification, the term "oil-containing fiber for cleaning" means a cleaning cloth that does not use water and is called a so-called chemical cleaning cloth, and contains an oil agent for adsorbing dirt such as dust. Cleaning is performed with the fibers thus made.

[0003]

2. Description of the Related Art Conventionally, for cleaning oil-containing fibers for cleaning, a large amount of concentrated alkali or detergent is required because the adhering oil content lowers the cleaning rate, and the cleaning is performed using a large amount of water. ing. In this method, the wastewater contains a large amount of alkali, detergent, dirt and oil,
A great deal of labor and cost are spent on the treatment of the wastewater. In addition, it is expected that the standards for wastewater treatment will become stricter in the future due to the need for environmental protection, and development of a cleaning method that facilitates wastewater treatment is required. Furthermore, since the cleaning work takes a long time, damage to the fibers used repeatedly is also a problem.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for cleaning oil-containing fibers for cleaning, which facilitates wastewater treatment, has a high cleaning effect, and has less damage to the fibers.

[0005]

Means for Solving the Problems As a result of intensive studies for achieving the above-mentioned object, the present inventor has found that the adsorption oil agent and organic dirt are removed by washing with an organic solvent and the inorganic dirt and It has been found that by combining removal of proteins and insoluble solids, the washing efficiency is improved and wastewater treatment can be easily performed.

The present invention provides a method for cleaning oil-containing fibers for cleaning, which comprises cleaning the oil-containing fibers for cleaning with an organic solvent and then performing water-based cleaning.

The oil-impregnating fiber for cleaning of the present invention is preferably an oil-impregnating fiber for cleaning used in homes or offices, but it is mainly used for industrial purposes such as oil stains. It may be an oil-containing fiber.

Even in the case of cleaning a conventional waste cloth or the like that is heavily soiled with oil, the present invention can be used when a large amount of soil such as inorganic substances and carbon that can be effectively cleaned with water is contained at the same time as oil soiling. The cleaning method can be applied.
In this case, a higher quality waste cloth can be provided.

As the oil agent for adsorbing dust or the like used in the oil-containing fibers for cleaning of the present invention, all oil agents such as mineral oil and vegetable oil conventionally used in the field for household or office use are used. To be Examples of the mineral oil include paraffinic oils, naphthene oils, aromatic hydrocarbon oils, and mixtures thereof in arbitrary ratios. Specific examples include liquid paraffin, spindle oil, machine oil, frozen oil, and other petroleum oils. Lubricating oil etc. are illustrated. Examples of synthetic lubricating oils include polyolefin oils (α-olefin oils), polyglycol oils, polyplan oils, alkylbenzene oils, and other synthetic lubricating oils. These oil agents may be used alone or as a mixture of two or more kinds at an arbitrary ratio. The oil agent is contained in an amount of about 5 to 30 parts by weight with respect to 100 parts by weight of the fiber component.

In addition to the above oil agents, waxes may be used in the cleaning oil-containing fiber of the present invention. Examples of the waxes include beeswax, wax, microcrystalline wax, candelilla wax, and bayberry wax,
These may be used alone or in combination of two or more.

The cleaning oil-containing fiber of the present invention contains other substances,
For example, a surfactant or the like can be held.

The material of the oil-containing fiber for cleaning of the present invention is as follows:
All conventional materials can be used, specifically, cotton, mercerized cotton, rayon, natural fibers such as hemp,
Chemical fibers such as polyvinyl alcohol, polyamide, acrylic, polyester and nylon may be used alone or in combination of two or more kinds. These fibers are
According to the method of the present invention used in the form of mop, hataki, string, cloth, mat, etc. in woven fabric, knitted fabric, non-woven fabric, etc., the oleaginous fiber for cleaning is first washed with an organic solvent. Organic solvents used for cleaning include alcohols such as butyl alcohol and isopropyl alcohol, halogenated hydrocarbons such as perkylene, trichlene and freon solvents, glycol ethers such as butyl cellosolve, ethers such as diethyl ether and dibutyl ether. , N-hexane, benzene, kerosene, gasoline, xylene, toluene, petroleum hydrocarbons such as petroleum ether, esters such as ethyl acetate, ketones such as acetone, etc. These may be used alone or in combination. It

A surfactant or water solubilized by the surfactant may be added to the organic solvent. The organic solvent is used in an amount of about 3 to 20 parts by weight based on 1 part by weight of the oil-containing fibers for cleaning used for cleaning.

The cleaning with the organic solvent is carried out by ultrasonic cleaning or stirring cleaning. The time required for cleaning is usually about 1 to 10 minutes per one time, and the temperature is about room temperature to 70 ° C. The cleaning is repeated about 3 times.

After the cleaning with the organic solvent, the water-based cleaning is performed. As the detergent used for the water-based cleaning, detergents and / or alkaline agents usually used for cleaning textiles are widely used. Specifically, the detergent includes soap, anionic surfactant, nonionic surfactant, Various synthetic surface active agents such as amphoteric surface active agents may be mentioned, and examples of alkaline agents include caustic soda, caustic potash, various silicates, carbonates and phosphates.

The cleaning water used for the water-based cleaning is 3 to 3 parts by weight of the dry weight of the oil-containing fibers for cleaning after the cleaning with the organic solvent.
About 20 parts by weight is used, and the washing water is prepared by dissolving 1 g to 20 g of detergent per 1 liter of water.

In addition to the above detergents, citrate, EDT
A, water softeners such as gluconate, and additives such as anti-redeposition agents such as carboxymethyl cellulose, polyvinyl alcohol, and sodium polyacrylate may be used.

[0018]

INDUSTRIAL APPLICABILITY According to the present invention, an adsorbent oil agent and organic dirt are removed by washing with an organic solvent by carrying out two-step washing with an organic solvent and water, and inorganic dirt, proteins and insolubles are obtained by washing with water. Removes dirt that can be easily washed by washing with water such as solids.

The solvent after washing with the organic solvent can be distilled and reused, and oily dirt can be separated as a distillation residue into a compact size and easily discarded. And at the next water-based cleaning,
Since the fiber does not contain oily dirt, the amount of detergent or alkaline chemicals used can be reduced to about 1/10 of that in the case of conventional cleaning without using an organic solvent. In addition, the amount of water used for cleaning was greatly reduced. In particular,
Since the cleaning effect of the water-based cleaning is very high, the cleaning operation as a whole is simplified even though the cleaning process is increased by one step as compared with the conventional one-step cleaning.

As a result, the amount of waste water generated is reduced to a few times, the amount of detergent in the waste water is very small, and the waste water contains almost no oily component. Wastewater treatment becomes possible by simple treatment, and the wastewater treatment equipment and process are simplified.

Moreover, the simplification of the washing process significantly suppressed the damage to the fibers and extended the life of the fibers.

[0022]

EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples.

[0023]

Example 1 (1) Preparation of model soiled cloth A mixture of 5 g of liquid paraffin, 0.1 g of carbon black and 5 g of JIS dust for testing (11 kinds of dust, Kanto loam, ultrafine particles, manufactured by Japan Powder Industry Association) Chloroform 9
0 ml was added, and the mixture was thoroughly stirred for about 10 minutes with a homomixer to prepare a dispersion liquid. A 5 cm × 5 cm cotton white cloth (Gold Width No. 3) was dipped in this dispersion to uniformly contaminate it. The amount of adhesion was adjusted so that liquid paraffin was about 20% by weight and dust was about 20% by weight with respect to the weight of the cotton white cloth. The contaminated test cloth was left in a constant temperature and humidity room at 25 ° C. and a humidity of 40% for one day and night, and then subjected to a cleaning test.

(2) Cleaning method Twenty sheets of soiled cloth are placed in a beaker for 5 minutes at a predetermined temperature (15
C. and 40.degree. C.) and 16 parts by weight of a commercially available dry cleaning solvent (Aqua Solvent G, manufactured by Aqua Chemical Co., Ltd.) was used with respect to 1 part by weight of the soiled cloth. Ultrasonic cleaning is used for solvent cleaning, and after repeating this twice, 1
Completely dried at 05 ° C.

Then, using a Terg-0-Tometer type detergency tester (manufactured by Ueshima Seisakusho), 100 ppm artificial hard water (Ca, 6 mmol; Mg, 4 mmol) in 1 L of LAS as a detergent, 30% of sodium metasilicate nonahydrate. Using 70% mixed detergent at a concentration of 0.11% by weight (1.1 g of mixed detergent / 1 L of artificial hard water), 50 ° C., 1
After washing for 0 minutes, rinsing for 2 minutes under the same conditions, air-drying and ironing, the whiteness of the cloth surface was measured with a colorimetric color difference meter to determine the cleaning rate. As the whiteness, generally used Hunter whiteness (W value) was used. The cleaning rate of each cloth was obtained according to the following formula, and the average value of each 20 sheets was evaluated.

Cleaning rate (%) = (Rw-Rs) / (Ro-
Rs) × 100 Ro: Whiteness of original white cloth Rs: Whiteness of contaminated cloth Rw: Whiteness of contaminated cloth after washing Hunter whiteness; W = 100 − [(100-L) ² + (a ² + b ² ). ² ]
^1/2

[0027]

[Comparative Example 1] A dirty cloth was not subjected to solvent cleaning but only water-based cleaning, and the cleaning rate was measured in the same manner as above.

The results are shown in Table 1 below.

[0029]

[0030]

Example 2 A beaker of 20 pieces of soiled cloth (first solvent bath)
120 ml of a commercially available dry cleaning solvent (Aqua Solvent G, manufactured by Aqua Chemical Co., Ltd.) was used for ultrasonic cleaning at room temperature (18 ° C.) for 5 minutes, and the above dry cleaning solvent was removed without removing the solvent. Washing was performed in a second solvent bath filled with, and the degreasing rate of the oil agent in each bath was determined. The degreasing rate is an average value of the results obtained by performing the above test three times.

The results are shown in Table 2.

[0032] The amount of oil remaining in the cloth after two solvent washes (residual oil content with respect to the dry cloth) was measured on the cloth, and the oil content of 20% by weight before cleaning decreased to 0.015% by weight. Was.

In this experiment, the oil was almost completely removed by the two washes even under the condition that the centrifugal solvent removal was not performed after the first washes.

[0034]

[Example 3 and Comparative Example 2] 20 pieces of the dirt cloth degreased by solvent washing obtained in Example 1 (2) were used to prepare 30% LAS of artificial hard water and 70% sodium metasilicate nonahydrate. % Cleaning was performed, and the relationship between the amount of detergent used and the cleaning rate was examined. Washing is carried out with the above-mentioned mixed detergent per 1 L of artificial hard water (standard usage is 1.
1 g (concentration: 0.11% by weight)) at 50 ° C.
A washing operation was performed for 0 minutes, and then rinsing was performed for 2 minutes under the same conditions, and the washing rate was obtained in the same manner as in Example 1.

For comparison, 20 sheets of uncleaned soil cloth were washed with the standard amount (1.1 g of detergent / 1 L of artificial hard water) and 1/2 of the detergent amount.

The results are shown in Table 3.

Table 3 Dirt cloth After solvent cleaning No solvent cleaning Detergent amount Standard 1/2 1/3 1/4 1/5 1/10 Standard 1/2 Cleaning rate (%) 75.4 74.4 73.3 73.7 73.7 66.3 62.1 53.7 Above From the results of Table 3, according to the method of the present invention in which the solvent cleaning is performed in advance, even if the amount of the detergent is reduced to 1/10 of the conventional amount, the current cleaning rate exceeds 62.1%, and the cleaning in the water-based cleaning It was confirmed that the effect was dramatically improved.

[0038]

Example 4 In order to examine the effect of the type of cleaning solvent on the cleaning method of the present invention, a cleaning test was conducted in the same manner as in Example 1 using the following solvents. The solvent washing temperature was room temperature (18 ° C.).

Hydrocarbon A: Idemitsu Super Sol CA25
(Idemitsu Kosan Co., Ltd.); Hydrocarbon B: Nusol DX High Soft (Nippon Oil Co., Ltd.); Hydrocarbon C: Naphthesol L (Nippon Oil Co., Ltd.).

The results are shown in Table 4.

[0041] From the results shown in Table 4, it was revealed that the type of cleaning solvent has almost no effect on the solvent cleaning of the present invention.

[0042]

[Example 5] The effect of the cleaning time in the aqueous cleaning of the cleaning method of the present invention was examined.

Twenty sheets of soiled cloth degreased by the cleaning system of the present invention were washed with the above-mentioned mixed detergent of 30% LAS in artificial hard water and 70% sodium metasilicate nonahydrate, and the washing time and washing. The relationship with the rate was examined.
For washing, 1.1 g of the above-mentioned mixed detergent (concentration: 0.11% by weight) was used per 1 L of artificial hard water, and the mixture was washed at 50 ° C for a predetermined time (10
Min, 7 min 5 min, 3 min) washing operation, followed by rinsing for 2 min under the same conditions, and in the same manner as in Example 1, the washing rate was obtained.

As a comparison, 20 sheets of uncleaned soiled cloth were washed for 10 minutes with a standard amount of detergent (1.1 g of detergent / 1 L of artificial hard water).

The results are shown in Table 5.

Table 5 Dirt cloth After solvent cleaning Only water-based cleaning Cleaning time (min) 10 7 5 3 10 Cleaning rate (%) 75.4 73.5 69.5 66.8 62.1 According to the cleaning method of the present invention, the cleaning time is reduced to 3 minutes. However, it was revealed that the cleaning effect was higher than that of the conventional method (only water-based cleaning).

[0047]

Front page continuation (72) Inventor Akira Tateishi 1-33 Toyotsu-cho, Suita City, Osaka Prefecture Duskin Co., Ltd.

Claims (1)

[Claims] 1. An oil-containing fiber for cleaning is washed with an organic solvent,
Then, a method for cleaning oil-containing fibers for cleaning, which is followed by water-based cleaning.