JP2007217569A - Cleanser composition for washing machine drum - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cleanser composition for washing machine drums, which can effectively peel and remove fungi, bacteria adhered to the back sides of the washing machine drums, filmy stains comprising detergents or the like, and other stains, has excellent storage stability, has low corrosiveness to various metals, when used as aqueous solutions, and does not produce irritative odors even in a high concentration aqueous solution. <P>SOLUTION: This cleanser composition for the washing machine drums contains a dichloroisocyanurate and sodium metasilicate pentahydrate only whose particle surfaces are subjected to a low hydration treatment, as essential components. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a detergent composition for a washing machine tub.

The dirt generated on the back side of the washing machine tub is composed of microorganisms such as mold, yeast and bacteria, detergent-derived components, sebum, and the like, and gradually accumulates on the back side of the washing machine tub and adheres to the film. Such dirt causes a bad odor coming out of the washing machine, and causes a problem that the loose dirt contaminates clothes during washing. This phenomenon is particularly likely to occur in a fully automatic washing machine tub that also serves as a dewatering basket. This is considered to be because, especially in the case of a fully automatic washing machine, washing water tends to remain on the back side of the dewatering tank, and mold contamination is likely to occur. Such mold stains on the washing machine may cause allergic dermatitis as well as clothing contamination, and are currently being investigated. The dirt on the back of the washing machine tub cannot be observed directly because of the structure of the washing machine, and the dirt is directly touched unless the washing machine is disassembled. Since it is not possible to remove the dirt, it is not easy and requires a lot of labor. Therefore, a composition in which a chlorine-based or oxygen-based bleach is mainly blended as a cleaning agent for a washing machine tub has been proposed. As an example using an oxygen bleach, there is a description of a washing method of a washing machine tub using sodium percarbonate (for example, see Patent Document 1), but a sufficient cleaning effect is not obtained. On the other hand, as an example using a chlorine bleach, a composition mainly composed of sodium hypochlorite and chlorinated cyanuric acid has been proposed (see, for example, Patent Document 2 and Patent Document 3). However, since the chlorine bleach has a strong oxidizing power, it is corrosive to metals and the like, and there is a concern about corrosion to metals such as aluminum, cast iron and stainless steel which are parts of washing machines.
JP-A-9-235595 (Claims) JP 59-71399 A (Claims) JP 2001-335799 A (Claims)

The advantage of the performance of the solution obtained by dissolving the dichloroisocyanurate used in the present invention in water is that the sterilizing power against various bacteria is reliable. On the other hand, since the reactivity is remarkably low, the storage stability is low, the corrosiveness to metals is intense, and it is difficult to use for sterilization under conditions where a lot of metals exist. In addition, when the concentration of the aqueous solution is increased, there is also an environmental disadvantage in use scenes such that a strong irritating odor is generated. Therefore, it is an indispensable condition for practical use that the storage stability is high, that the corrosion-inhibiting ability is ensured, and that no irritating odor is generated even when the concentration of the aqueous solution is increased.
The present invention is to solve this problem in view of the above-mentioned problems and the present state of the art, and removes film-like dirt and other contaminants made of mold, bacteria, detergent, etc. attached to the back side of the washing machine tub. A detergent composition for washing machine tubs that can be effectively peeled and removed, has excellent storage stability, has low corrosiveness to various metals when used as an aqueous solution, and does not generate irritating odors even in high-concentration aqueous solutions The purpose is to provide goods.

  This invention is a washing | cleaning-agent composition for washing machine tubs containing a dichloro isocyanurate and sodium metasilicate pentahydrate which carried out the hypohydration process only of the particle | grain surface as an essential component.

  Preferred forms are as follows.

  The dichloroisocyanurate is sodium dichloroisocyanurate. The compounding quantity of sodium metasilicate pentahydrate is 150 mass parts or more with respect to 100 mass parts of dichloroisocyanurate.

  The blending amount of sodium metasilicate pentahydrate is 150 parts by mass or more and 2000 parts by mass or less with respect to 100 parts by mass of dichloroisocyanurate.

  The pH of a 1% by mass aqueous solution of the composition is 11 or more.

  The blending amount of dichloroisocyanurate in the composition is 0.5 to 40% by mass.

  The blending amount of dichloroisocyanurate in the composition is 3 to 40% by mass.

  The composition of the present invention can effectively remove and remove film-like dirt and other contaminants made of mold, bacteria, detergent, etc. attached to the back side of the washing machine tub, and can be used when dissolved in water. Metal corrosion and generation of irritating odor are extremely small, and it has excellent storage stability.

  It is known that the sterilizing power of a solution obtained by dissolving dichloroisocyanurate in water has a sufficient effect. However, with respect to the generation of irritating odors from metal corrosive and high-concentration aqueous solutions, there has been no sufficient countermeasures so far, so the range that can be used has been limited. According to the present invention, the conventional common sense is changed, and the bactericidal power of dichloroisocyanurate can be widely and effectively used even in the form of a high-concentration aqueous solution.

  The present invention will be described below.

For the purpose of preventing metal rust when dichloroisocyanurate is dissolved in water and preventing the generation of irritating odors from high-concentration aqueous solutions, only dichloroisocyanurate and the particle surface are low water as essential components in the composition. sodium metasilicate was divided treated pentahydrate (sodium metasilicate _{5H 2 O: Na 2 O ·} SiO 2 · 5H 2 O) and a is contained as an essential component.

  Here, the conventional sodium metasilicate pentahydrate and the sodium metasilicate pentahydrate obtained by subjecting only the particle surface to a low hydration treatment can be distinguished by the following method for measuring the amount of adhered water.

  The method for measuring the amount of adhering water is as follows. Refer to the Japanese Pharmacopoeia General Test Method and the ignition loss test method. Calculate (hydrate water content).

Adhering moisture amount (%) = [1-A × (W3-W1) / (W2-W1)] × 100 (Formula 1)
The symbol of the above formula 1 is determined as follows.

A: 1.7377 (coefficient) [= 212 (molecular mass Na ₂ O.SiO ₂ .5H ₂ O) / 122 (molecular mass Na ₂ O.SiO ₂ )]
W1: crucible mass (g)
W2: Total mass (g) of W1 and the sample weighed before ignition drying
W3: Total mass (g) of W1 after ignitable drying and the exact sample weight
The measured value of the attached water content of sodium metasilicate pentahydrate in which only the particle surface used in the present invention is subjected to a low hydration treatment according to the formula 1 is -0.01 to -1.00% by mass.

  This -0.01--1.00 mass% respond | corresponds to the moisture content ratio from which the water as a hydrate separated from the particle | grain surface of the sodium metasilicate pentahydrate from the particle | grain surface by the low hydration process.

  As a method for subjecting only the particle surface of sodium metasilicate pentahydrate to a low hydration treatment, a drying method using an aeration flow hot air drying method such as fluidized bed drying or airflow drying is employed.

  A preferred embodiment of the present invention will be described.

  Examples of the dichloroisocyanuric acid salt used in the present invention include sodium salt and potassium salt of dichloroisocyanuric acid, with sodium dichloroisocyanurate being preferred.

  Sodium metasilicate pentahydrate in which only the particle surface is subjected to low hydration treatment with respect to 100 parts by mass of dichloroisocyanurate in order to ensure the metal corrosion inhibitory effect and prevent the generation of irritating odors from highly concentrated aqueous solutions. The blending amount of the Japanese product is 150 parts by mass or more, and the pH of the 1% by mass aqueous solution of the composition is 11 or more. Moreover, as an upper limit of the compounding quantity of sodium metasilicate pentahydrate, it is 2000 mass parts with respect to 100 mass parts of dichloro isocyanurate.

  By making the pH of the 1% by mass aqueous solution of the composition 11 or more, the metal corrosion inhibiting effect is ensured and the generation of irritating odors from the high concentration aqueous solution is prevented.

  In order to improve the storage stability of the composition, the blending amount of dichloroisocyanurate in the composition is 0.5 to 40% by mass or 3 to 40% by mass.

  By adding 150 parts by mass or more of sodium metasilicate pentahydrate with a low hydration treatment only on the particle surface to 100 parts by mass of dichloroisocyanurate, iron, stainless steel, copper, brass, It is considered that specific adsorption of silicate anions occurs on a metal surface such as aluminum, and the produced adsorbed film serves as a protective film on the metal surface, thereby preventing attack of metal corrosion factors. This concerns the electric double layer potential at the metal / solution interface. In addition, the alkali content in sodium metasilicate pentahydrate, which is a hypohydrated treatment only on the particle surface, ionizes hypochlorous acid, which is an active ingredient of dichloroisocyanurate, in an aqueous solution. We think that we are suppressing. In addition, a composition containing dichloroisocyanurate and sodium metasilicate pentahydrate has a poor storage stability, so when stored at a relatively high temperature, it rapidly caking (consolidates). However, it is possible to suppress this by using sodium metasilicate pentahydrate with a low hydration treatment only on the particle surface, and by adjusting the amount of dichloroisocyanurate to 3 to 40% by mass. it can. Sodium metasilicate pentahydrate obtained by subjecting only the particle surface to a low hydration treatment can be easily obtained as a commercial product.

  EXAMPLES Hereinafter, although an Example and a comparative example are given and this invention is demonstrated in detail, the technical scope of this invention is not restrict | limited by this.

  Here, the trade name “Sodium Silicate Pentahydrate” (manufactured by Sanpo Chemical Industry Co., Ltd.) was used as sodium metasilicate pentahydrate (untreated product). On the other hand, the product name “Metaace 5 (high fluidity pentahydrate)” (manufactured by Sanpo Chemical Industry Co., Ltd.) is used as sodium metasilicate pentahydrate (dried product) that has been subjected to low hydration treatment only on the particle surface. used. In the method for measuring the amount of adhering moisture, the amount of adhering moisture of the used “sodium metasilicate pentahydrate” (manufactured by Sanpo Chemical Industry Co., Ltd.) was 1.09% by mass. Moreover, the amount of adhering water of “Metaace 5 (high fluidity pentahydrate)” (manufactured by Sanpo Chemical Industry Co., Ltd.) used was −0.51% by mass.

  In Examples 1-7 and Comparative Examples 1-2, the composition of the mixing | blending shown in Table 1 was created, and the following evaluation was performed.

[Metal corrosion test]
Each of the compositions of Examples 1 to 7 and Comparative Examples 1 and 2 shown in Table 1 was dissolved in distilled water so that the effective chlorine concentration was 1000 ppm. Is immersed and stored at 40 ° C. for 24 hours. The degree of corrosion after storage was measured and the rating of the degree of corrosion was determined. The results are shown in Table 1.

Corrosion degree: Reduced mass of test piece due to corrosion (mdd: mg / dm ² · d)
Corrosion degree was classified according to the following criteria (rating).

  A (excellent): 0 to 10, B (possible) 10 to 50, C (no)> 100.

[PH measurement of 1% aqueous solution]
The compositions of Examples 1 to 7 and Comparative Examples 1 and 2 shown in Table 1 were each dissolved in distilled water to prepare a 1% aqueous solution, and then the pH was measured. The results are shown in Table 1.

[Irritating odor confirmation test]
The compositions of Examples 1 to 7 and Comparative Examples 1 and 2 shown in Table 1 were each dissolved in distilled water so that the effective chlorine concentration was 1000 ppm, and this solution was put in a plastic container and sealed in a temperature state. The amount of irritating odor generated after storage at 40 ° C. for 2 hours, 4 hours and 6 hours was measured with a chlorine gas detector tube. The results are shown in Table 1.

  In Examples 8 to 9 and Comparative Examples 3 to 4, compositions having the composition shown in Table 2 were prepared and evaluated as follows.

[Stability test]
The compositions of Examples 8 to 9 and the compositions of Comparative Examples 3 to 4 shown in Table 2 were each filled with 100 g of aluminum bags (15 cm × 10 cm), heat sealed, and hermetically stored at 55 ° C., respectively. The presence or absence of caking was confirmed after storage for 24 hours and 48 hours. The results are shown in Table 2.

  A test solution prepared by dissolving the compositions of Example 10 and Comparative Example 5 shown in Table 3 in distilled water so that the effective chlorine concentration is 500 ppm, and sodium percarbonate in distilled water so that the effective oxygen concentration is 500 ppm. Dissolved test solutions (Comparative Example 6) were prepared, and the following evaluations were performed using these test solutions.

[Detergency evaluation]
A drainage hose of a washing machine used for 5 years in ordinary households was cut into 5 cm widths as samples having the same scale as the laundry basket, and samples to be cleaned were obtained. 150 ml of the test solution of Example 10 and Comparative Example 5 was taken in a beaker, each of the above samples was immersed one by one, and left as it was at room temperature. After immersion for 6 hours, the sample was taken out and air-dried, and then the cleaning property was confirmed. Each sample after air drying and an untreated sample (untreated drainage hose) were compared visually, and the degree of removal of dirt (scale, black mold, etc.) was observed and evaluated according to the following criteria A to E. . The results are shown in Table 3. A: Dirt was completely removed. B ... Most of the dirt was removed. C: About half of the dirt was removed. D: Most of the dirt remained without being removed. E ... unchanged from untreated sample.

[Metal corrosion test]
The test solutions of Example 10 and Comparative Examples 5 to 6 are placed in a plastic container, sealed with various metal test pieces immersed therein, and stored at 40 ° C. for 24 hours. The degree of corrosion after storage was measured and the rating of the degree of corrosion was determined. The results are shown in Table 3.

Corrosion degree: Reduced mass of test piece due to corrosion (mdd: mg / dm ² · d)
Corrosion degree was classified according to the following criteria (rating).

  A (excellent): 0 to 10, B (possible) 10 to 50, C (no)> 100.

  As shown in Tables 1 to 3, the composition of the present invention can effectively peel and remove film-like dirt and other contaminants composed of mold, bacteria, detergent, etc. attached to the back of the washing machine tub. When used by dissolving in water, the metal corrosiveness and the generation of irritating odors are extremely small, and the storage stability is excellent.

Conventionally, it has been known that the sterilizing power of a solution obtained by dissolving dichloroisocyanurate in water has a sufficient effect. However, with respect to the generation of irritating odors from metal corrosive and high-concentration aqueous solutions, there has been no sufficient countermeasures so far, so the range of use has been limited. According to the present invention, film-like dirt and other contaminants made of mold, bacteria, detergent, etc. attached to the back side of the washing machine tub can be effectively peeled off and removed, and the storage stability is excellent and used as an aqueous solution. In this case, it has become possible to provide a detergent composition for a washing machine tub that is low in corrosiveness to various metals and that does not generate an irritating odor even in a high concentration aqueous solution. As a result, the sterilizing power of aqueous solutions of dichloroisocyanurate, whose range of use was limited to specific applications, can be used widely and effectively even under conditions where there are many metals and in the form of highly concentrated aqueous solutions. Therefore, it was expected that the application of the aqueous solution could be expanded.

Claims (6)

A detergent composition for a washing machine tub comprising dichloroisocyanurate and sodium metasilicate pentahydrate obtained by subjecting only the particle surface to a low hydration treatment as essential components. The detergent composition for a washing machine tub according to claim 1, wherein the dichloroisocyanurate is sodium dichloroisocyanurate. The washing | cleaning-agent composition for washing machine tanks of Claim 1 whose compounding quantity of sodium metasilicate pentahydrate is 150 mass parts or more with respect to 100 mass parts of dichloro isocyanurate. The washing | cleaning-agent composition for washing machine tanks of Claim 1 whose compounding quantity of sodium metasilicate pentahydrate is 150 mass parts or more and 2000 mass parts or less with respect to 100 mass parts of dichloro isocyanurate. . The detergent composition for a washing machine tub according to claim 1, wherein the pH of the 1 mass% aqueous solution of the composition is 11 or more. The cleaning composition for a washing machine tub according to claim 1, wherein the blending amount of dichloroisocyanurate in the composition is 0.5 to 40% by mass.