JPH11217596A - Mould remover - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a mould remover settable even after applied to a perpendicular surface without running down and acting for a long time at high concentrations, therefore capable of effectively removing moulds, by including sodium hypochlorite, sodium magnesium silicate and water. SOLUTION: This mould remover is obtained by including (A) sodium hypochlorite with an active chlorine content of >=3 wt.%, pref. the upper limit being about 6 wt.%, (B) >=3 wt.%, pref. 3-6 wt.%, of sodium magnesium silicate, and (C) water. When an appropriate amount of the component B is added to an aqueous solution of the component A, the resulting mixture exhibits high thixotropy, being in gel form when left at rest without fluidity. However, when it is agitated or shaken, it becomes fluid, enabling brush coating or spraying operation. As the component A being on the market normally contains about 12 wt.% of active chlorine, it is preferable that the component A is used after diluted with water C appropriately.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fungicide capable of easily removing mold generated on a tile joint in a high-temperature, high-humidity bathroom or the like. 2. Description of the Related Art Molds are likely to occur on tile joints in bathrooms of high temperature and high humidity. In particular, black mold generated at tile joints is a problem both in hygiene and aesthetics. Conventionally, for mold removal such as tile joints, aqueous solutions of chlorine bleach such as sodium hypochlorite or chlorine dioxide have been used, but because of low viscosity, they will run down when applied to vertical surfaces, In the applied state, the active ingredient volatilizes quickly, so that it cannot be used at a high concentration for a long time, and the effect is small. In general, when it is desired to increase the viscosity of an aqueous solution, a thickener such as starch or a water-soluble polymer compound is added. However, since sodium hypochlorite has a strong oxidizing property, the above organic substances are used. Thickener decomposes and is not usable. SUMMARY OF THE INVENTION [0004] The present invention provides a fungicide that can settle without flowing down even when applied to a vertical surface and can be effectively removed since it acts for a long time at a high concentration. With the goal. [0005] A fungicide according to the present invention contains at least 3% by weight of sodium hypochlorite, at least 3% by weight of sodium magnesium silicate and water as available chlorine. It is characterized by. [0006] When an appropriate amount of hydrophilic sodium magnesium silicate is added to an aqueous sodium hypochlorite solution, this mixture has a high thixotropic property and is gel-like and has no fluidity in a standing state, but is stirred or shaken. It becomes fluid and can be brushed and sprayed. The concentration of sodium hypochlorite in the fungicide is 3% by weight or more as available chlorine. At 2% by weight, the mold removing effect is poor. Since commercially available sodium hypochlorite usually contains about 12% by weight of available chlorine, it is appropriately diluted with water before use. The upper limit is not particularly limited. However, when the concentration is high, the chlorine odor becomes strong, which is unpleasant and unhealthy at the time of use. Therefore, the upper limit of the effective chlorine is preferably about 6% by weight. Since sodium hypochlorite is gradually decomposed, it is necessary to take into account that the sodium is contained in a large amount in consideration of the decomposition loss during the period from production to use. [0008] Sodium magnesium silicate is a white to light brown powder that is insoluble in water, but swells and becomes colloidal when added to water. The sodium magnesium silicate concentration is 3% by weight or more. When the content is less than 2% by weight, the effect of improving the viscosity is small, and when applied to a vertical surface, it flows down. Chlorine odor due to chlorine volatilization is also observed. On the other hand, when the concentration of sodium magnesium silicate is 7% by weight or more, the viscosity becomes too strong, a film of sodium magnesium silicate is formed on the surface of the mold, and the function of sodium hypochlorite tends to be weakened. However, if the surface of the mold is wetted in advance with water and a fungicide is applied, a sufficient fungicide effect is exhibited. From another viewpoint, when the concentration of sodium magnesium silicate is 7% by weight or more, the viscosity is too high even in a fluid state, so that it is difficult to fill the container without pressurization. In consideration of these points, the concentration of sodium magnesium silicate is preferably set to 3 to 6% by weight. Within this range, the fluidity during coating, the fixability after coating, and the mold removing effect are excellent, and chlorine odor during use is hardly detected. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the following embodiments, but the present invention is not limited to the following embodiments. Examples and Comparative Examples A test solution was prepared by mixing an aqueous sodium hypochlorite solution having an effective chlorine content of 12% by weight and a synthetic sodium magnesium silicate in the proportions shown in Table 1 (the remainder being water). . These test solutions are applied to the joints on the wall of the vertical tile where the black mold has been generated with a brush. In the case of the examples in which the content of sodium magnesium silicate is 3% by weight or more, the gel is fluid in a static state and the fluidity is high. However, it became fluid when agitated or shaken, and could be brushed or sprayed. The liquid applied in a fluidized state immediately became a gel and was fixed to the joint. After elapse of 20 minutes, the joint was washed with water and the condition of the joint was observed. Table 1 shows the results. [Table 1] As is apparent from Table 1, when the content of sodium magnesium silicate is 2% by weight (Comparative Examples 1, 3, and 4), regardless of the available chlorine concentration, there is almost no viscosity. It flowed down and did not settle on the intended joint, and the mold removal effect was insufficient. Even if the content of sodium magnesium silicate is 3% by weight or more,
When the effective chlorine concentration was 2% by weight (Comparative Example 2), the mold removing effect was insufficient. However, when the effective chlorine contains 3% by weight or more of sodium hypochlorite and 3% by weight or more of sodium magnesium silicate (Examples 1 to 3).
In 7), the applied fungicide was fixed on the vertical surface, and the fungicide could be effectively removed in a short time. [0013] Even when applied to a vertical wall surface, the toner is fixed without flowing down and acts for a long time at a high concentration, so that it is possible to effectively remove mold.

Claims (1)

Claims 1. A fungicide containing as active chlorine 3% by weight or more of sodium hypochlorite, 3% by weight or more of sodium magnesium silicate and water.