JPH0353359B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a mildew stain cleaning agent for cleaning grime and mold stains adhering to tile surfaces, tile joints, etc. As is well known, in places where there is a lot of soap scum and high humidity, such as bathrooms, dirt substances adhere to the bathtub surface and walls such as tiles, and mold and other microorganisms grow, causing spots due to the secretions. Discolored areas (hereinafter referred to as mold stains) occur. The above-mentioned dirt substance is mainly composed of metal soap produced from heavy metals in the water used and fatty acids in the soap, and has a film-like surface layer with sebum, dust, etc. attached to it. The above-mentioned mold stains caused by mold are often covered with a film-like surface layer of dirt substances. To clean such dirt and mildew, an acidic cleaning agent composed of an organic acid such as malic acid or citric acid, a surfactant, and a water-soluble solvent is used. Alternatively, an alkaline cleaning agent composed of a surfactant and a chelating agent is used, and an aqueous hypochlorite solution is used for mold-stained areas. However, as mentioned above, the stains in the bathroom often contain a mixture of grime and mold, so it is necessary to use two types of detergents together to clean the bathroom stains. This is an inconvenience, and the reason why detergents for stains and detergents for mold are prepared separately is that when an organic acid is used together with an aqueous hypochlorite solution, the hypochlorite decomposes. It cannot be used because it generates toxic gases, and chelating agents are unstable in hypochlorite aqueous solutions, so two types of detergents cannot be used together. There were also some inconveniences. The present invention aims to provide a mildew stain cleaning agent that can eliminate the above-mentioned inconveniences. The cleaning agent of the present invention will be described in detail below.The cleaning agent of the present invention contains hypochlorite as a mold stain cleaning component,
This product is characterized by containing caustic alkali as a stabilizer for this hypochlorite and lauryl dimethylamine oxide as a dirt cleaning component.The lauryl dimethylamine oxide removes dirt. The purpose is to clean and at the same time remove mold stains using hypochlorite. The cleaning agent of the present invention was developed based on the idea of cleaning dirt substances mainly composed of soap scum using a surfactant that is stable against hypochlorite. After using many types of surfactants and conducting repeated experiments, we discovered that lauryl dimethylamine oxide was effective, as will be seen in the Examples below. It is presumed that this lauryl dimethylamine oxide can exhibit a synergistic effect when used in combination with hypochlorite, and this synergistic effect is thought to be obtained for the following reasons. First, the dirt on hard surfaces such as tiles is aged for a long period of time, turns into resin, and adheres to the hard surface in the form of a film. Although it is possible to molecularize and make it easier to remove, hypochlorite aqueous solutions act only on the surface of the dirt layer and cannot clean the entire dirt layer. However, in the cleaning agent of the present invention, the surfactant penetrates into the layer of dirt material, and this surfactant allows hypochlorite to penetrate into the dirt material, so the layer of dirt material is eliminated. It is assumed that it will be easier. In particular, lauryldimethylamine oxide is stable in hypochlorite aqueous solutions and has excellent permeability.
In addition, the above-mentioned synergistic effect is considered to be significant because the calcium salt has a good dispersion effect. Secondly, lauryl dimethylamine oxide has a good ability to clean dirt and grime, so it can remove the dirt that covers mold stains and expose mold stains. It is thought that the mold stain cleaning effect will be improved. In addition, it has been confirmed that the cleaning of the present invention produces a remarkable shine on the surface of tiles and bathtubs made of plastic, stainless steel, enamel, etc. after use, and this point can also be noted as a favorable effect.
The concentration of hypochlorite in the cleaning agent of the present invention is related to issues such as usage, irritation standards, stability in a state of compatibility with surfactants, and how fast to clean mold stains. However, usually
It is selected in the range of 0.5 to 6% by weight, particularly preferably 1 to 5% by weight, and in this case it is desirable to use sodium hypochlorite. That is, if the hypochlorite content is less than 0.5% by weight, it will be less effective against heavy mold stains, and if it exceeds 6% by weight, the stability will deteriorate. The amount of lauryl dimethylamine oxide above is
The concentration of hypochlorite is determined by taking into consideration the stability and detergency in an aqueous hypochlorite solution.
When the weight is 0.5-6, it is best to choose 0.3-3% by weight.
Particularly preferred is 0.5 to 1% by weight. That is, lauryldimethylamine oxide is 0.3
This is because if it is less than 3% by weight, it will be less effective against thick layers of dirt substances, and if it exceeds 3% by weight, stability will deteriorate. The caustic alkali may be sodium or potassium, and its concentration is determined so that the caustic alkali improves the stability of the hypochlorite in the aqueous solution containing lauryl dimethylamine oxide and obtains the cleaning action of the alkali. This is determined by the method of use of the cleaning agent of the present invention and the criteria for irritation, and is usually 0.5 to 1% by weight.
However, the upper limit can be increased up to about 4% by weight, which is slightly lower than the legal limit. Examples of the cleaning agent of the present invention will be described below. Example 1 Using various surfactants shown in Table 1, a detergent for mildew stains (effective chlorine concentration: 3.8%) having the following composition was prepared. Sodium hypochlorite 4.0% by weight Surfactant (purity equivalent) 1.0 〃 Sodium hydroxide 0.8 〃 Water Balance After putting this cleaning agent in a polyethylene bottle, sealing it, and storing it at a constant temperature of 38℃ for 1 month, the hypochlorite The residual rate of sodium chlorate was measured and the storage stability was investigated.

[Table] From the results in Table 1, it was confirmed that all the surfactants used in this example had stability in an aqueous sodium hypochlorite solution. Example 2 Four tile boards were pasted together using Meji, and mold in the bathroom was allowed to grow uniformly on the surface to create a mold-stained board. Aqueous solutions with various concentrations of hypochlorous acid shown in the table below were sprayed, and the relationship between the time and the rate at which mold stains were removed was determined visually.

[Table] From the results, it was confirmed that a sodium hypochlorite aqueous solution with an effective chlorine content of 0.5% or more is extremely effective against mold stains. Example 3 A metal soap (calcium stearate) aqueous solution was sprayed onto the surface of a tile board, and then heated at 100°C for 3 hours to produce a soap scum stain board that had matured into a film. A board stained with soap scum was cleaned using an aqueous composition (cleaning agent) containing a surfactant. The cleaning conditions were as follows: using a Henry Gardner cleaning tester, a cellulose sponge (5 cm x 10 cm) was impregnated with 2 m of the aqueous solution composition, and scrubbed 10 times at room temperature under a load of 1050 g. The results are determined by comparison using a standard judgment stain board prepared in advance (a 10-level judgment board is created with 10 being completely cleaned and 1 being no cleaning at all). I asked for it.

[Table] From the results in Table 3-2, a remarkable synergistic effect of hypochlorite and lauryldimethylamine oxide on soap scum stains was observed. Example 4 Using the same stain board as in Example 3, the effect of lauryl dimethylamine oxide in a sodium hypochlorite solution was evaluated. The cleaning method and the method for determining its conditions are the same as in Example 3.

【table】

[Table] From the results in Table 4, it was found that the cleaning effect on soap scum stains was significantly improved by using sodium hypochlorite in combination with lauryl dimethylamine oxide. Example 5 Using the same stained board as in Example 3, the quantitative influence of lauryl dimethylamine oxide was evaluated. The cleaning method, its conditions, and determination method are as shown in Example 3.
is the same as From the results in Table 5 below, the quantitative effect of lauryl dimethylamine oxide on hypochlorite at various concentrations on soap scum stains is significant when it is 0.3% or more, and especially when it is 1% or more. No significant performance improvement was observed.

[Table] Example 6 The following three types of compositions (cleaning agents) were used in general households (30
A usage test was conducted in the bathroom of

【table】

[Table] Evaluations were made by spraying each composition onto areas where blackhead stains caused by mold were present and comparing the effectiveness of removing blackheads in pairs. The results showed that Compositions 1 and 2 were sprayed for 3 to 4 minutes;
Composition 3 was evaluated as being able to clean black stains that had previously been difficult to remove, whereas composition 3 was evaluated as being unable to be cleaned by spraying alone and leaving black stains behind. On the other hand, for stains mainly composed of soap scum on the bathtub, walls, floors, wash basins, etc., spray each composition and then rub lightly with a sponge to remove the limescale and soap scum stains. A pairwise comparison was made to determine the cleaning effect. The results showed that Composition 1 had no cleaning effect on these stains, but Compositions 2 and 3 had excellent cleaning effects and the stains were thoroughly removed. The finished tile and bathtub surfaces were glossy and were evaluated to be excellent.

Claims (1)

[Claims] 1 Hypochlorite as a mold stain cleaning ingredient
0.5 to 6% by weight, about 0.5 to 4% by weight of caustic alkali as a stabilizer for this hypochlorite, and about 0.3 to 3% by weight of lauryl dimethylamine oxide as a dirt cleaning ingredient. A cleaning agent for mildew stains, characterized in that dimethylamine oxide is used to clean the dirt substance layer mainly composed of metal soap that covers the mold stains.