JP2520428B2 - Solid agent for black mold removal and bleaching - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention is directed to the removal of black mold generated on the inner and outer surfaces of a building or a cloth, which is an obstacle in a general living environment.
Bleaching, ceramics such as tableware, plastic plaque,
The present invention relates to a solid agent that can be used for removing and bleaching contaminants such as mold that are difficult to remove by washing.

Background of the Invention Black molds often occur on damp places such as exterior walls of buildings, indoor bathrooms, toilets and kitchens, or on cloth and plastics. Further, it is well known that pollutants such as tea stains that are difficult to clean and attach adhere to tableware after long-term use.

Conventionally, as the agent for removing and bleaching contaminants such as black mold, an aqueous solution of sodium hypochlorite or sodium percarbonate has been generally used.

However, each of these removal and bleaching agents has a difficulty in use. For example, the former aqueous solution of sodium hypochlorite has a strong odor peculiar to chlorine, has a strong alkali, and is dangerous to the human body. Further, the latter sodium percarbonate aqueous solution is odorless, but its efficacy is relatively weak, and there is a problem in that its use is limited.

[Purpose of the Invention] From the above viewpoints, the present inventor has diligently studied a novel bleaching agent having a high effect of removing and bleaching contaminants by solving the above-mentioned problems of the conventional removing and bleaching agents, and forming the present invention. The object of the present invention is to provide a solid agent which is excellent in handleability and long-term storability, can be easily used at the time of use, and has a high effect of removing and bleaching black mold and the like.

[Summary of the Invention] The features of the solid agent for removing and bleaching contaminants such as black mold, which are made for the purpose of realizing the above-mentioned object, are as follows.
In use, the solid substance can be utilized only by dissolving it in water, and the hypobromite that is formed by the reaction at that time is utilized. Specifically, the solid substances of calcium hypochlorite and inorganic bromide are mainly used. For the removal and bleaching of black mold in the form of powder, granules and tablets, which contains a solid alkaline agent whose content is adjusted so that the pH of the aqueous solution when dissolved in water is 10 to 13.5 It is characterized by being a solid agent.

For the calcium hypochlorite, which is the main component of the solid agent, for example, bleached powder, highly exposed powder can be used, and similarly, as the inorganic bromide, anhydrous solids of sodium bromide and potassium bromide can be used. .

These are generally contained in the solid agent so as to be in a chemical equivalent amount according to the following reaction formula.

Further, it is also preferable to mix an appropriate amount of a solid alkaline agent such as anhydrous sodium metasilicate. If the alkalinity (pH) of the aqueous solution used at the time of application is high, the rate of formation of hypobromite by the following chemical reaction will be slow, and if the alkalinity is low, the formed hypobromite will be easily formed. This is because it is decomposed and disappears, and it is most preferable to add it so that the pH is generally 10 to 13.5, and particularly pH is 11 to 12.5. Such a mixture is stable in a solid anhydrous state, but when dissolved in water, it produces hypobromite according to the following chemical reaction formula.

Ca (ClO) ₂ + 2NaBr → 2NaBrO + CaCl _{2 The} above alkaline agent has a pH of the aqueous solution when dissolved in water.
It is advisable to add it in advance so that it will be 10 or more. However, since normally bleaching powder contains calcium hydroxide, it is often unnecessary to add it separately when using bleaching powder.

In the solid agent for black mold removal / bleaching of the present invention, in addition to the above active ingredients, solid surfactants, excipients, desiccants, dispersants, etc. may be added to improve the effect.
Alternatively, they may be added together for the purpose of improving molding and stability.

[Effect of the invention] Since the solid agent for removing black mold and bleaching according to the present invention is solid, it is possible to obtain a free dosage form product such as powder, granules, granules and pellets. In the solid state, there is no odor, there is little risk of sticking to the human body, it has the characteristics of good storage stability, and it can be used by simply dissolving it in water at the time of use. Compared with this, the effect time is much faster, and even if the concentration is low, the effect of removal and bleaching can be sufficiently exerted.

Further, since calcium hypochlorite and an inorganic bromide are used, as compared with Comparative Examples 1 and 2 having a chlorine odor, the medicinal solution of the present invention has an advantage that there is almost no chlorine odor as can be seen from Examples 4 and 5. is there.

As the black mold removing / bleaching agent utilizing hypobromite as an active ingredient, an aqueous solution type may be considered, but compared with the removing / bleaching agent, the solid agent of the present invention is solid until use. The hypobromite, which is easily decomposed, is generally removed as it is treated and stored until it is dissolved in water during use.
There is an effect that the bleaching effect can be effectively used and a burden for suppressing decomposition is reduced.

[Examples of the Invention] The present invention will be specifically described below with reference to examples.

Examples 1 to 3 In this example, the solid agent of the present invention was prepared as a mixture of bleaching powder and bromide, and the rate at which hypobromite was formed when the solid agent was dissolved in water and used. , And stability of formed hypobromite (decomposition rate)
However, the state that changes with alkalinity (pH) was investigated.

The chemicals used are generally commercially available. The bleaching powder is soluble high-level bleaching powder containing 71% of available chlorine (manufactured by Nisshin Denka Co., Ltd.) and sodium bromide with a purity of 99% (for chemicals: Matsunaga Chemical Co., Ltd.). The alkaline agents used in combination are reagents.

These agents were weighed at a fixed ratio shown in Table 1, and a mixture was prepared by pulverizing well in a porcelain mortar. This mixture was dissolved and allowed to stand in water at room temperature so as to have a constant concentration calculated by the reaction formula, and the time-dependent change in the concentration of sodium hypobromite produced by chemical analysis was measured. The results are shown in Table 1. It was shown to.

From the results of Table 1, it is found that the production rate and stability of sodium hypobromite change depending on the alkalinity (pH), and sodium hypobromite is generated almost instantaneously at pH = 11 to 12, The decomposition and disappearance speed is also fast. It is stable above pH = 13, but the production rate is slow. Usually, it takes a few minutes to 1 to 2 hours to process the actual mold and bleach, so the practical alkalinity of the bleach is pH = 11.
The optimum value is ~ 12.

Examples 4 and 5, Comparative Examples 1 to 3 The present examples and comparative examples were obtained by using the product of the present invention prepared by mixing solids of bleached powder and sodium bromide, and dissolving this in water. Removal of sodium hypobromite
The bleaching property was sought, and the bleaching property was compared with the removal / bleaching property of the aqueous solution type sodium hypochlorite agent and sodium percarbonate agent which have been used in practice.

Each of the aqueous solutions used was prepared by dissolving or diluting with water so as to have a constant concentration shown in Table 2, using a generally commercially available drug.

That is, the bleaching powder and sodium bromide used were the same as in Examples 1 to 3, sodium hypochlorite was a commercially available reagent (available from Katayama Chemical Co., Ltd.) containing 12% of available chlorine, and sodium percarbonate was also a commercially available reagent ( Kishida Chemical Co., available oxygen 14
%) Were used respectively.

As a test body for bleaching, a cloth (test body 1) on which black mold was generated and adhered, a wall material (test body 2), and white porcelain tableware (test body 3) on which brown plaque was adhered were used.

That is, the test body 1, and polyester cloth with a 5 / plain black fungus black spot cm ^2, test material 2 is peeled off the white wall which is entirely discolored to black (10% reflectance due to packet whiteness meter) And made it a test body. The test body 3 is a white porcelain tea bowl that has been used at home for several years, and it cannot be removed with an ordinary detergent, and is clearly discolored to brown.

The treatment operation was carried out by immersing the test specimens in the aqueous solutions of the respective Examples and Comparative Examples at room temperature until the specimens returned to the state before contamination by black mold (test specimen 1 was used to determine black spots with the naked eye). Test piece 2 until the reflectance by the ket whiteness meter reaches 60% or more, and test piece 3
Then, until the brown color completely disappears), the length of immersion time was examined. The odor of the drug solution was added to this result, which is shown in Table 2.

As can be seen from the results in Table 2, the solid removing / bleaching agent of the present invention, which is a mixture of bleaching powder and sodium bromide, has a very excellent removing / bleaching effect when it is used by dissolving it in water. , Almost instantaneous removal / bleaching speed, 2
Even if it is diluted twice, its effect is superior, and the difference in the effect is remarkable by comparison with the conventional removal / bleaching agent.

Claims (1)

(57) [Claims] 1. An aqueous solution containing calcium hypochlorite and an inorganic bromide solid as main components and dissolved in water.
A solid agent for the removal and bleaching of black mold which contains a solid alkaline agent whose addition amount is adjusted so as to have a pH of 10 to 13.5 and is in the form of powder, granules or tablets.