JPH09250079A - Cleaning of textile product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cleaning method causing little soil redeposition and decreased staining of washing tab with soap scum compared with conventional method. SOLUTION: Water containing 1-1,000ppm of a builder is used in a water- washing process of a textile product throughout the whole process from washing to rinsing.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an aqueous cleaning method for textile products.

[0002]

2. Description of the Related Art Water-based cleaning is widely used in household and industrial fields because it does not use an organic solvent and does not require large-scale equipment for cleaning textiles. This water-based cleaning is usually carried out by adding textiles such as clothes to a detergent aqueous solution mainly containing a surfactant such as soap, alkylbenzene sulfonate, and alkyl sulfate, and stirring and washing to disperse dirt in water. It consists of removing the dispersed dirt and surfactant in the rinse. However, since tap water usually used for washing contains 20 to 200 ppm of metal ions such as calcium ions and magnesium ions, if the textile product is washed with tap water using only the surfactant, which is the main component of the detergent,
There is a problem that the charge on the particle surface of the dirt component is neutralized by the metal ions contained in tap water, the dispersion of the dirt component in water is hindered, and the detergency is lowered. Further, in recent years, from the standpoint of environmental protection, soap with good biodegradability has been reconsidered as a surfactant for washing, but when soap is used as a surfactant for washing, it becomes a metal ion of tap water. Alkaline ions in the soap cause salt exchange to form water-insoluble metal soap called soap dregs, which not only reduces the cleaning power, but also causes the soap dregs to adhere to clothes and washing machines, causing yellowing and washing tubs. Cause mold. This is the main reason why the soap-based laundry detergent has not spread.

As a means for solving this, it has been conventionally practiced to add a cleaning aid called a builder to a surfactant to enhance the cleaning power. The functions of the builder are broadly divided into 1) adjusting the hydrogen ion concentration of the wash water to an appropriate value for washing, 2) encapsulating metal ions in the wash water by forming chelates, and 3) dispersing dirt particles in water. There are three aspects of improving stability and preventing recontamination of stains on textiles. A compound added to a detergent as a builder usually has one or more of these three functions, and typical ones are tripolyphosphate, zeolite, polyacrylate, ethylenediaminetetraacetate. It is now widely used as a builder for commercial detergents. However, when washing with a detergent containing these builders, although a sufficient effect is seen during washing, the builder is diluted and removed during rinsing, so the builder concentration in the rinsing water decreases, and it is effective in the latter half of rinsing. Is almost gone. For this reason, there is a problem that stains remaining until the latter half of rinsing are re-adsorbed on clothes during rinsing. In particular, in a detergent containing soap, the residual soap content is re-adsorbed as a fatty acid or a metal soap on the fibers and the washing machine at the time of rinsing, which causes stains on the textile products and the washing tub.

In order to alleviate these problems, commercially available detergents have been added with more builders than those required in the washing step, so as to keep the builder concentration in the rinsing step as much as possible. The effect is not sufficient, and the amount of builders in the laundry drainage increases by using more builders than necessary during washing. However, since the builders used in detergents are mostly compounds that cause eutrophication in rivers and compounds that are difficult to biodegrade, an increase in the amount of builders in the wastewater further increases the problem of domestic wastewater given to the environment. Become.

As another means for improving the detergency of detergency caused by the use of hard water, it has been proposed to use soft water as the water used for washing and rinsing to improve the detergency of detergents. For example, Japanese Utility Model Publication No. 58-54239, Japanese Patent Laid-Open No.
No. 296963 discloses a soft water producing apparatus using an ion exchange resin for washing, and an actual softening machine 63-9.
No. 292 discloses a water supply softening device for a washing machine utilizing magnetic force, and in No. 61-45916 and No. 61-98594, a washing machine applying an ion exchange resin to a washing tub. A throw-in type water softener has been proposed. By utilizing these softened water for washing and rinsing, it is possible to carry out washing and rinsing in a state where the pH is adjusted and the amount of metal ions is small.

[0006]

However, when the ion-exchanged water is used for washing, the supplied water is softened, but the metal ions emitted from the object to be washed cannot be removed. In addition, there is a problem that a regeneration operation of the ion exchange resin is required. Further, in the water softening device utilizing magnetic force, the regenerating operation is simplified, but the effect is not sufficient, and the metal ions emitted from the object to be washed cannot be removed.
In addition, in a washing machine throw-in type water softener, there is a problem that a washing tub cannot be effectively utilized and durability is poor.
Furthermore, in none of these cases has the problem of recontamination during rinsing been sufficiently solved.

[0007]

Means for Solving the Problems As a result of studies on the above problems, the present inventors have found that a small amount of builders are continuously present in the feed water during the washing process and the rinsing process. It was found that the problem of soiling of textile products and soap shavings in washing tubs at that time could be improved, and the present invention was accomplished. That is, in the present invention, in the water-based washing of textiles, the whole process from washing to rinsing is 1-1000 p
A method for cleaning a textile product, which comprises using feed water containing a pm builder.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION In the cleaning method of the present invention, the supply water containing a builder is adjusted and supplied by a method in which the supply water for washing becomes a builder aqueous solution having a predetermined concentration throughout the entire washing and rinsing process. Any method may be used as long as it is, for example, a method of preparing a builder aqueous solution of a predetermined concentration in a tank for feed water in advance and using water from the tank for washing and rinsing, a high-concentration builder solution From the stock tank to the water supply line for washing, using proportional injection pump, valve, line mixer, nozzle, etc.
A method of adding a builder to a predetermined concentration, a solubilizing agent such as polyoxyethylene glycol, polyoxypropylene polyoxyethylene block copolymer, or a molding aid for polyethylene glycol, polyalkylene oxide derivative, carboxymethyl cellulose, etc. Add slow-dissolving solids that have been processed into blocks, tablets, granules, etc., by adding agents, etc., and add or insert them into a retention tank or column installed in the middle of the water supply line to supply a builder aqueous solution of a specified concentration to the washing tub. Method etc. are mentioned. Among them, for commercial equipment for washing a large amount of textile products, a method of preparing a builder aqueous solution in advance in a feed water tank and a method of adding a high-concentration builder aqueous solution to a feed water line by proportional injection are preferable, and For household laundry, a method of adding an aqueous builder solution to the feed water line by a simple mechanism such as a valve, a line mixer, or a nozzle, and a method of gradually dissolving the builder in the feed water using a slowly dissolving solid substance are available. preferable. The builder concentration in the feed water at this time is 1 to 1000 ppm, preferably 10 to 5
It is adjusted to be 00 ppm, more preferably 50 to 300 ppm. If the builder concentration is less than 1 ppm, the builder function is insufficient and the detergency is reduced. Further, even if the builder concentration exceeds 1000 ppm, the improvement of the effect is small compared to the increase of the builder concentration, which is economically disadvantageous.

The builder used in the present invention is not particularly limited as long as it is a builder used in a known detergent for washing textile products, and examples thereof include lithium, sodium,
Alkali metal hydroxides, carbonates, hydrogencarbonates, silicates, phosphates, phosphites, polyphosphates, alkali metal compounds such as borates, monoethanolamine, diethanolamine Water soluble amines such as triethanolamine, morpholine, water soluble amine carbonates, bicarbonates, silicates, phosphates, phosphites, polyphosphates, borates, fatty acid salts Water-soluble amine compounds, basic compounds such as zeolite, polyphosphoric acid, nitrilotriacetic acid, ethylenediaminepolycarboxylic acid, oxalic acid, tartaric acid, citric acid, gluconic acid, hydroxyethylethylenediaminepolycarboxylic acid, dihydroxyethylethylenediaminepolycarboxylic acid, 1 ，
3-propanediamine polycarboxylic acid, diethylene triamine polycarboxylic acid, triethylene tetramine polycarboxylic acid, hydroxyethylimino polycarboxylic acid, polycarboxylic acid, thiopolycarboxylic acid and salts thereof,
A metal chelating agent such as zeolite, more specifically,
Tripolyphosphoric acid, nitrilotriacetic acid, ethylenediaminetetraacetic acid, ethylenediaminetetraacetic acid, oxalic acid, tartaric acid,
Citric acid, gluconic acid, hydroxyethylethylenediaminetriacetic acid, dihydroxyethylethylenediaminediacetic acid, 1,3-propanediaminetetraacetic acid, diethylenetriaminepentaacetic acid, triethylenetetraminehexaacetic acid, hydroxyethyliminodiacetic acid, polyacrylic acid, carboxyethylthio Succinic acid and alkali metal salts thereof, other metal salts, organic amine salts, ammonium salts, orthophosphates, trimetaphosphates, tripolyphosphates, metaphosphate glasses, phosphates such as pyrophosphates, silicates , Silicates such as polysilicates, zeolites, borates such as sodium borate, sulfates such as sodium sulfate, oxalates, tartrates, citrates, gluconates, pyromellites, benzopoly Carboxylates such as carboxylates Aminocarboxylic acid salts such as nitrilotriacetic acid salts, ethylenediaminetetraacetic acid salts and diethylenetriaminepentaacetic acid salts, ethercarboxylic acid salts such as carboxymethyl tartrate salts, carboxymethyloxysuccinic acid salts and oxydiacetic acid salts, polyacrylic acid salts, acrylic acid- Maleic acid copolymer salt, acrylic acid-methacrylic acid copolymer salt, ethylene-maleic acid copolymer salt, styrene-maleic acid copolymer salt, diisobutylene-maleic anhydride copolymer salt , Poly α-hydroxyacrylate, polycarboxylate such as polyitaconate, carboxylated starch, carboxymethylated starch, carboxyethylated starch, water-soluble starch derivative such as water-soluble starch, methyl cellulose, ethyl cellulose, carboxymethyl cellulose, Cal Water-soluble cellulose derivatives such as voxyethyl cellulose, hydroxymethyl cellulose, polystyrene sulfonate, salts of naphthalene sulfonic acid formalin condensate, sulfonates of styrene-maleic acid copolymer sulfonates, polyvinyl alcohol, polyglycerin, etc. Water-soluble polyol such as polyethylene glycol, ethylene oxide-propylene oxide block copolymer, ethylene oxide adduct of glycerin, ethylene oxide adduct of butanol, ethylene oxide adduct of alkylphenol and alkylene oxide adduct of ethylenediamine, ethylenediamine ethylene oxide adduct Addition of alkylene oxide adduct of organic amine such as ethylene oxide adduct of ethylamine, ethylene oxide adduct of acetic acid Things, ethylene oxide adducts of benzoic acid, alkylene oxide adducts of carboxylic acids such as ethylene oxide adducts of carboxyethyl thio succinic acid, polyvinyl pyrrolidone, a nitrogen-containing water-soluble polymer such as polyethylene polyamines. Among these, tripolyphosphate, oxalate, tartrate, citrate, gluconate, aminocarboxylate, ethercarboxylate,
Preferred examples include polycarboxylic acid salts, thiocarboxylic acid salts, and zeolite.

In the washing method of the present invention, the feed water containing these builders is supplied to the washing tub, and the textile product and the detergent as the articles to be washed are put therein to be washed, and then the feed water containing the builders is added. The steps of rinsing, dehydration and drying are recommended. As the detergent used at this time, any of known surfactants and known detergents for textile products can be used. In the cleaning method of the present invention, it is particularly preferable that the detergent used contains a builder component. Since it is not necessary, it is economically advantageous to use only the surfactant as a detergent.

Known surfactants used in the washing step of the present invention include anionic surfactants, cationic surfactants, nonionic surfactants, amphoteric surfactants and the like. These surfactants may be used alone or in combination of two or more.

As the anionic surfactant, for example,
Salts of saturated or unsaturated fatty acids such as lauric acid, oleic acid and stearic acid, salts of higher alcohol sulfates such as lauryl sulphate, stearyl sulphate, palmitylphenol sulphate or alkylphenol sulphates, lauryl ether sulphate, oleyl ether sulphate Alkyl ether sulfate salts such as, sulfated oil salts, sulfated fatty acid ester salts, sulfated fatty acid salts, lauryl sulfonates, alkyl sulfonic acid salts such as oleyl sulfonates, lauryl benzene sulfonate, Salts of alkylbenzene sulfonic acids such as nonylbenzene sulfonates, salts of olefin sulfonates such as paraffin sulfonates, and further lauryl phosphonates, distearies Alkyl or a salt of a dialkyl phosphonate, such as phosphonate, and the like salts of acyl main dust taurine.

As the cationic surfactant, for example,
Examples thereof include alkylamine salts such as laurylamine hydrochloride and stearylamine acetate, and quaternary ammonium salts such as lauryltrimethylammonium chloride and lauryldimethylbenzylammonium bromide.

Examples of the nonionic surfactant include higher alcohol alkylene oxide adducts such as lauryl alcohol ethylene oxide adducts and oleyl alcohol ethylene oxide adducts, alkylphenol alkylene oxide adducts such as lauryl phenol ethylene oxide adducts and stearyl phenol ethylene oxide adducts. , Lauric acid ethylene oxide adducts, oleic acid ethylene oxide adducts, stearic acid ethylene oxide adducts and other fatty acid alkylene oxide adducts,
Alkyl or alkenylamine alkylene oxide adducts such as lauryl amine ethylene oxide adduct, oleyl amine ethylene oxide adduct, stearyl amine ethylene oxide adduct, lauric acid amide ethylene oxide adduct, oleic acid amide ethylene oxide adduct, stearic acid amide ethylene oxide adduct, etc. Examples thereof include amide alkylene oxide adducts, lauric acid monoglyceride, pentaerythritol stearate ester, and alkylalkanolamides.

As the zwitterionic surfactant, for example,
Examples thereof include amino acid type zwitterionic surfactants, betaine type zwitterionic surfactants such as stearyl dimethyl betaine and lauryl dihydroxyethyl betaine.

Among these, soaps, salts of higher alcohol sulfates or salts of alkylphenol sulfates, salts of alkyl ether sulfates such as lauryl ether sulfate and oleyl ether sulfate, salts of sulfated oil, salts of sulfated fatty acid ester. , Salts of sulfated fatty acids, salts of alkyl sulfonic acids such as lauryl sulfonate and oleyl sulfonate, salts of acylmethyl taurine, higher alcohol alkylene oxide adducts, alkyl or alkenyl amine alkylene oxide adducts, fatty acid amide alkylene oxides Surfactants with good biodegradability such as adducts, alkylalkanolamides and mixtures thereof are preferred, but the characteristics of the present invention such as reduction of problems of soap dregs and reduction of adverse effects of laundry drainage on the environment. There best appear is given surfactant comprising soap and their soaps such as fatty acid sodium salt, fatty acid potassium salt. These detergents are used in the usual way and in the amounts used as powders or liquids in the feed water during washing of textiles.

The washing method of the present invention is not particularly limited as long as it is a water-based laundry, and the washing method is not particularly limited, but it is applicable to a washing method using a domestic washing machine or a commercial washing machine. It is preferably applied. Further, within a range that does not impair the characteristics of the present invention, an enzyme, a perfume, a corrosion inhibitor, a fluorescent whitening agent, a bleaching agent, a foam increasing agent, a foam stabilizer, a foam suppressing agent,
Detergent additives such as softening agents may be used.

The feed water before the addition of the builder used in the water-based cleaning method of the present invention includes well water, tap water, natural water from rivers and lakes, rain water, soft water, ion-exchanged water, distilled water,
Although any of pure water can be used, the feature of the present invention is best shown in these is hard water having a metal ion concentration of 50 ppm or more.

[0019]

EFFECTS OF THE INVENTION When a textile product is washed using the method of the present invention, recontamination of washing stains on the textile product is reduced, and when a soap-based detergent is used, the textile product and the laundry are washed with soap residue. Dirt in the tank can be reduced.

[0020]

EXAMPLES The present invention will be described below with reference to examples. Example 1 4 kg of artificial hard water whose calcium ion concentration was adjusted to 70 ppm with calcium chloride was added to a 5-liter stainless steel tank equipped with a stirrer, and sodium carbonate 0.05, which is a builder 1 component shown in Table 1, was used.
g, 0.4 g of sodium tripolyphosphate and 0.05 g of carboxymethyl cellulose are added and stirred to dissolve 1
4 liters of feed water containing 25 ppm of builder component was prepared. 1 liter of this feed water is used as a cleaning agent component in Table 2
40 parts of a polyester / cotton blended artificially contaminated cloth and 2 white cloths were washed with a tergotometer using a cleaning solution in which 1 g of the detergent 1 shown in 1) and 1 g of beef tallow fatty acid sodium were dissolved.
A cleaning test was performed at a rotation speed of 200 rpm for 10 minutes. Then, the washed artificially contaminated cloth was rinsed with 1 liter each of the remaining 3 liters of the supplied water under the conditions of 5 times 3 times and the number of rotations was 200 times / min.
After being dried, the ratio of the stain component detached from the artificially contaminated cloth to the white cloth (recontamination preventing ability) was measured by the following method. The results are shown in Table 3. In addition, the cleaning drainage and the rinse drainage during this cleaning were collected in respective beakers, and the generation state of soap dregs was visually evaluated in the following five grades. The results are shown in Table 3 as the generation status of soap residue.

[0021]

[Table 1]

[0022]

[Table 2]

[0023]

[Table 3]

Recontamination prevention ability (%) = {(whiteness of white cloth before washing-whiteness of white cloth after washing) / whiteness of white cloth before washing} × 100 Evaluation of soap dust generation status ◎: Wash drainage , Soap residue is not seen in all rinse water. ◯: Soap residue was found in the cleaning waste water, but no soap residue was found in the rinse waste water. Δ: No soap residue is found in the cleaning drainage, but soap residue is visible in the rinse drainage. X: Soap residue is seen in both the cleaning drainage and the rinse drainage.

Examples 2 to 4 Except that the components and amounts of the builders 2 to 4 shown in Table 1 were used as the builder components, and the components of the detergents 2 to 4 shown in Table 2 and the amounts thereof were used as the detergents used during washing. In the same manner as in Example 1, the redeposition preventing ability and the state of soap residue formation were measured. The results are shown in Table 3.

Comparative Example 1 Only artificial hard water was used as the feed water, and a mixture of the components of Builder 1 shown in Table 1 and Detergent 1 shown in Table 2 was added as a cleaning agent at the time of washing with a tergotometer. Except that it was rinsed only with artificial hard water.
In the same manner as in Example 1, the anti-redeposition ability and the state of soap residue formation were measured. The results are shown in Table 3.

Comparative Examples 2 to 4 A mixture of the builders 2 to 4 shown in Table 1 as the builder components and the components of the detergents 2 to 4 shown in Table 2 as the detergent to be used at the time of washing was added all at once as a detergent. The recontamination preventing ability and the state of soap dregs production were measured in the same manner as in Example 1 except that the washing was performed and the rinsing was performed using only artificial hard water. The results are shown in Table 3.

Comparative Example 5 The same method as in Example 1 was used except that 1.5 g of commercially available laundry powder soap (soap content: 1.0 g) was used as the cleaning agent, and the anti-redeposition property and the generation of soap residue were obtained. The situation was measured. The results are shown in Table 3.

As is apparent from Table 3, Examples 1 to 4 according to the cleaning method of the present invention are the conventional cleaning method using the cleaning agent of the same composition as Comparative Examples 1 to 4 and commercially available washing powder soap. It can be seen that, as compared with Comparative Example 5 used, recontamination and generation of soap residue are less.

Claims (1)

[Claims] 1. A method for washing a textile product, wherein in water-based washing of a textile product, feed water containing 1 to 1000 ppm of a builder is used throughout all steps from washing to rinsing.