JP2010242024A - Detergent composition for washing system recycling drain by reverse osmosis membrane - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a detergent composition coping with a washing system which recycles the drain using a reverse osmosis membrane, while controlling the damage of cloths due to repeated washings and improving the bleachability of stains. <P>SOLUTION: The detergent composition is for washing systems recycling the drain by reverse osmosis membranes, includes 10-70 wt.% of carbonates, and 5-50 wt.% of fatty acid soap, and does not include cationic surfactants nor silicates as alkaline agents. The wash drain is treated with the reverse osmosis membranes. The treated water is used for wash water. The detergent composition is put into the wash water, and the washing is conducted. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a detergent composition corresponding to a laundry system for wastewater recycling in which laundry wastewater is treated with a reverse osmosis membrane (also referred to as RO membrane; hereinafter the same).

  Sheets, towels, towels, etc. used in hotels, inns, hospitals, restaurants, etc. are generally supplied to customers by a linen supplier, collected after use, and washed. For washing at a linen supplier, a horizontal rotating batch type washing machine or a continuous washing machine is mainly used, and a large amount of water is required. For this reason, an increasing number of linen suppliers are introducing wastewater recycling systems using reverse osmosis membranes for the purpose of reducing the amount of water used for washing (well water and tap water) and the amount of washing wastewater (sewerage water) (patents listed below). Reference 1).

  Conventionally, as a detergent composition for linen supply, for example, as described in Patent Document 2 below, a nonionic surfactant such as polyoxyalkylene alkyl ether and water of alkali metal or alkaline earth metal are used. What contains alkali agents, such as an oxide, a silicate, and carbonate, and a chelating agent is used.

JP 2001-232159 A JP 2002-138298 A

  When a wastewater recycling system using a reverse osmosis membrane is introduced, a conventional cleaning composition for linen supply cannot be used as it is. Since the reverse osmosis membrane usually has an anion charge on the membrane surface, when the detergent contains a cationic surfactant, the cationic surfactant is adsorbed on the membrane surface, causing a decrease in permeation flow rate. Further, if the silicate is contained in the cleaning agent, it may be combined with dirt and the like to generate water insoluble matter (scale) and adhere to the film surface. Further, when silicone is contained in the cleaning agent, it is similarly adsorbed on the film surface and causes a decrease in permeation flow rate. As described above, the detergent composition corresponding to the laundry system that performs wastewater recycling by the reverse osmosis membrane is required to contain no cationic surfactant, silicate, or silicone.

  Therefore, for example, it is conceivable to use a cleaning agent mainly composed of a carbonate not containing silicate as an alkali agent and a nonionic surfactant. However, with carbonates and detergents mainly composed of nonionic surfactants, problems such as embrittlement of fabric due to repeated washing and deterioration of stain bleaching are newly generated. Therefore, it is desired to develop a cleaning composition corresponding to a washing system that eliminates these problems and performs wastewater recycling using the reverse osmosis membrane.

  The present invention has been made in view of the above points, and washing corresponding to a washing system that performs wastewater recycling by a reverse osmosis membrane while suppressing embrittlement of fabric due to repeated washing and improving stain bleaching properties. An object is to provide an agent composition.

  According to the present invention, there is provided a cleaning system cleaning composition for wastewater recycling using a reverse osmosis membrane, comprising 10 to 70% by weight of carbonate and 5 to 50% by weight of fatty acid soap, a cationic surfactant and A cleaning composition is provided that does not contain silicate as an alkaline agent.

  According to the present invention, in the washing method in which washing wastewater is treated with a reverse osmosis membrane and washing is performed using the treated water as washing water, washing is performed by putting the cleaning composition into washing water. A washing method for wastewater recycling using a reverse osmosis membrane is provided.

  According to the present invention, by using a combination of a predetermined amount of carbonate and fatty acid soap, it is compatible with a washing system that performs wastewater recycling using a reverse osmosis membrane, while suppressing embrittlement of fabric due to repeated washing, Bleaching can be improved.

It is a block diagram which shows the flow of a process of the washing system which performs the waste_water | drain recycling by a reverse osmosis membrane.

  Hereinafter, matters related to the implementation of the present invention will be described in detail.

  The cleaning composition according to the present invention contains carbonate as an alkaline agent and fatty acid soap.

  Examples of the carbonate include sodium carbonate, sodium sesquicarbonate, and potassium carbonate. Preferably, sodium carbonate is used. The blending amount of the carbonate is preferably 10 to 70% by weight, more preferably 30 to 60% by weight. When the blending amount of the carbonate is less than 10% by weight, the alkalinity of the washing liquid is low, and stain removal by a stain remover or a bleaching agent becomes poor. On the other hand, if it exceeds 70% by weight, the alkalinity of the washing liquid is high and the rinsing property becomes poor. The said compounding quantity is a weight ratio which occupies for the whole cleaning composition. However, in the case of an aqueous solution, the weight ratio is based on the total solid content excluding water (the same applies to the amount of each component described below).

  As the fatty acid soap, an alkali metal salt or an alkanolamine salt of a saturated or unsaturated fatty acid having 8 to 22, preferably 10 to 20 carbon atoms can be used. The alkali metal salt is preferably a sodium salt or potassium salt, and the alkanolamine salt includes a monoethalamine salt or a triethanolamine salt. Examples of the fatty acid include synthetic fatty acids such as caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, caproleic acid, laurolenic acid, oleic acid, linoleic acid, linolenic acid, and arachidonic acid, Fatty acids of animal and vegetable oils and fats such as coconut oil, palm oil, soybean oil, rapeseed oil, coconut oil, and beef tallow, or fatty acids of these oils and hardened oils such as hardened oil of fish and oil, and transesterified oils of the above-mentioned animal and vegetable fats and oils Natural fatty acids, and can be produced by directly saponifying them or neutralizing fatty acids derived from them or synthetic fatty acids.

  The blending amount of the fatty acid soap is preferably 5 to 50% by weight, more preferably 10 to 40% by weight. By setting the blending amount of the fatty acid soap within this range, embrittlement of the fabric due to repeated washing can be suppressed, and stain bleaching can be improved.

  A nonionic surfactant can be further mix | blended with the cleaning composition which concerns on this invention. Incorporation of a nonionic surfactant in addition to the above components improves the detergency for synthetic fibers such as polyester. Nonionic surfactants include, for example, polyoxyalkylene alkyl ether, polyoxyalkylene alkylphenyl ether, sorbitan fatty acid ester, polyoxyalkylene sorbitan fatty acid ester, polyoxyalkylene fatty acid ester, glycerin fatty acid ester, polyoxyalkylene glycerin fatty acid ester , Polyglycerol fatty acid ester, sucrose fatty acid ester and the like. Preferably, polyoxyalkylene alkyl ether whose alkyl group has 6 to 14 carbon atoms is used. As a compounding quantity of a nonionic surfactant, it is preferable that it is 5 to 20 weight%, More preferably, it is 5 to 15 weight%.

  A chelating agent can be further blended in the cleaning composition according to the present invention. By adding a chelating agent in addition to the above components, effects such as dispersion of dirt components coming out of the object to be washed can be expected, and abnormal reaction between the metal adhering to the object to be washed and the bleaching agent can be prevented. You can also. Examples of the chelating agent include phosphonic acid, tripolyphosphoric acid, ethylenediaminetetraacetic acid, hydroxyethylethylenediaminetriacetic acid, diethylenetriaminepentaacetic acid, triethylenetetraminehexaacetic acid, nitrilotriacetic acid, ethylene glycose bis (2-aminoethyl ether) tetraacetic acid, citrate. Acid, maleic acid, polyacrylic acid, acrylic acid-maleic acid copolymer, acrylic acid-methacrylic acid copolymer, gluconic acid and salts thereof (for example, alkali metal salts such as sodium salt and potassium salt, and alkalamine salts) ). As a compounding quantity of a chelating agent, it is preferable that it is 5 to 50 weight%, More preferably, it is 10 to 25 weight%.

  In the cleaning composition according to the present invention, in addition to the above-mentioned components, as long as the effects of the present invention are not impaired, if necessary, for example, another anionic surfactant, a recontamination preventive agent such as carboxymethylcellulose, You may mix | blend the other components generally used for the cleaning agent for linen supplies, such as an enzyme and fluorescent dye.

  Since the cleaning composition according to the present invention is used in a laundry system that performs wastewater recycling using a reverse osmosis membrane, a cationic surfactant is not blended. This is because the reverse osmosis membrane is anionically charged on the membrane surface, and if a cationic surfactant is contained, the cationic surfactant is adsorbed on the membrane surface, causing a decrease in permeation flow rate.

  The cleaning composition according to the present invention is also free of silicates that are normally blended in linen supply cleaning agents. This is because if silicate is contained, it may combine with dirt and the like to generate water insoluble matter (scale) and adhere to the film surface. Further, silicone is not blended in the cleaning composition according to the present invention. This is because if silicone is contained, it is similarly adsorbed on the membrane surface and causes a decrease in permeation flow rate.

  The cleaning composition according to the present invention is used in a laundry system that performs wastewater recycling using a reverse osmosis membrane. In other words, when washing wastewater is treated with a reverse osmosis membrane and washing is performed using the treated water as washing water, the washing wastewater is used to wash the linen that is to be washed. .

  FIG. 1 is a conceptual diagram showing an example of such a laundry system. As shown in the drawing, the washing water of (1) is subjected to washing of linen, which is the object to be washed, with the above-mentioned cleaning composition added in the washing tub of the washing machine in (2). After washing, the washing water is drained from the washing tub in (3), and the washing drainage is treated with activated sludge in (4). The water purified by the activated sludge treatment is subjected to reverse osmosis membrane treatment in (5), and the membrane treated water that has permeated through the reverse osmosis membrane is blended with well water and tap water in (6), and the washing water in (1) The above (2) and subsequent steps are repeated.

  The washing machine is not particularly limited, and various washing machines such as a batch washing machine and a continuous washing machine that are generally used in the linen supply industry can be used. The activated sludge treatment is a treatment for decomposing and purifying organic substances in water with microorganisms, and is not particularly limited. The reverse osmosis membrane is not particularly limited, and those generally used for purification of waste water can be used.

  Hereinafter, the present invention will be specifically described by way of examples, but the scope of the present invention is not limited thereto.

  In accordance with the formulation shown in Table 1 below, each component was mixed to prepare cleaning compositions of Examples and Comparative Examples. Details of each component in the table are as follows.

Fatty acid soap: “Tancal CO-50” manufactured by Miyoshi Oil & Fats Co., Ltd. (main components: Nauric laurate, Naoleate)
Polyoxyalkylene alkyl ether: “Genbu LF Base” manufactured by Daiichi Kogyo Seiyaku Co., Ltd.

  Using each of the detergent compositions of Examples and Comparative Examples as a detergent, the embrittlement rate and stain bleaching property of the fabric were measured by the following test methods.

[Dough embrittlement rate]
・ Laundry test method Testing machine: “Targotometer” manufactured by Daiei Kagaku Seiki Seisakusho Co., Ltd.
Test piece: manufactured by Ohno Co., Ltd., cotton sheet fabric 25cm x 25cm
Test conditions: washing 70 ° C. × 15 minutes, 100 rpm, bath ratio 1:30
Detergent composition concentration in washing water: 0.3% by weight,
Use hydrogen peroxide as a bleaching agent (0.4% by volume)
Rinse 2 minutes x 2 times, squeezing rate 200%, dehydration 5 minutes, ironing
Repeat the above work.

・ Measurement method of embrittlement rate Testing machine: Autograph (universal material testing machine, “INSTRON 5881” manufactured by Instron Japan Co., Ltd.)
Test piece: Cotton sheet fabric after washing was cut into 20 cm × 2.5 cm in the vertical and horizontal directions, 3 sheets each for a total of 6 test methods: Tensile strength was measured according to the general textile test method of JIS L1096 Tensile speed is 15 ± 1 cm / min. Calculation method of embrittlement rate:
Embrittlement rate (%) = (Tensile strength before test−Tensile strength after test) × 100 / Tensile strength before test Calculated by the average value of 6 test pieces.

[Stain bleaching]
・ Laundry test method Testing machine: “Targotometer” manufactured by Daiei Kagaku Seiki Seisakusho Co., Ltd.
Test piece: Made by EMPA, all fabric is cotton
EMPA112 ... cocoa
EMPA116 Blood / Milk / Ink
EMPA167 ... Black tea Test conditions: Washing 70 ° C x 15 minutes, 100 rpm, bath ratio 1:30
Detergent composition concentration in washing water: 0.15% by weight,
Use hydrogen peroxide as a bleaching agent (0.2% by volume)
Rinse 2 minutes x 2 times, squeeze rate 200%, dehydration 5 minutes, ironing.

・ Measurement method of stain bleaching property Tester: Spectroscopic colorimeter (“TC-1500SX” manufactured by Tokyo Denshoku)
Specimen: Measure the reflectance of the specimen after cleaning. Calculation method for stain bleaching (cleaning efficiency):
Stain bleaching property (%) = (reflectance after test−reflectance before test) × 100 / (reflectance of white cloth−reflectivity before test).

  The results are as shown in Table 1 below. In comparison with Comparative Example 1 mainly comprising carbonate and a nonionic surfactant and not containing fatty acid soap, the dough after repeated washing is an example in which fatty acid soap is blended. The degree of embrittlement was reduced, and the spot bleaching property was also improved. In Comparative Example 2, both the embrittlement rate and the stain bleaching property of the fabric were good compared to Comparative Example 1, but since silicate was used as an alkaline agent, wastewater recycling using a reverse osmosis membrane was performed. It was not suitable for the laundry system.

[Evaluation of wastewater recycling system using reverse osmosis membrane]
The composition of the detergent composition is 48.5% by weight of sodium carbonate, 20% by weight of fatty acid soap ("Tancal CO-50" manufactured by Miyoshi Oil & Fats Co., Ltd.), polyoxyalkylene alkyl ether (Daiichi Kogyo Seiyaku Co., Ltd.) "Genbu LF base") 10 wt%, sodium tripolyphosphate 20 wt%, carboxymethylcellulose 1 wt%, and fluorescent dye 0.5 wt%.

  This cleaning agent is used in linen suppliers (washing machine: “CR60-12BF” manufactured by Mitsubishi Heavy Industries Industrial Equipment Co., Ltd., reverse osmosis membrane equipment: manufactured by Nippon Pure Water Co., Ltd.) that has introduced a wastewater recycling system using reverse osmosis membranes. When the laundry was evaluated using the composition as a detergent, there was no problem in wastewater recycling treatment, and the conventional carbonate and nonionic surfactant were mainly used in terms of fabric embrittlement and stain bleaching. An improvement effect was recognized for the detergent, and good results were obtained.

  INDUSTRIAL APPLICABILITY The present invention can be used for a laundry system that performs wastewater recycling using a reverse osmosis membrane, and can be suitably used particularly in the linen supply industry.

Claims (3)

  A detergent composition for a laundry system that performs wastewater recycling using a reverse osmosis membrane, comprising 10 to 70% by weight of carbonate and 5 to 50% by weight of fatty acid soap, and a silicate as a cationic surfactant and an alkaline agent A detergent composition characterized by not containing any of the above.   The detergent composition according to claim 1, comprising 5 to 20% by weight of a nonionic surfactant and 5 to 50% by weight of a chelating agent.   In a washing method in which washing wastewater is treated with a reverse osmosis membrane and washing is performed using the treated water as washing water, the washing is performed by introducing the cleaning composition according to claim 1 or 2 into the washing water. Washing method for wastewater recycling by reverse osmosis membrane characterized by

Images