JPH0881289A - Dissolution and removal of adhered efflorescence - Google Patents

Abstract

PURPOSE: To obtain a method for removing only the efflorescence adhered to a substrate such as stone, tile or concrete without damaging the surface of the substrate by coating the surface of the efflorescence with the mixture solution of phosporic acid with sulfamic acid. CONSTITUTION: This method for dissolving and removing the adhered efflorescence (insoluble calcium, etc.) by coating the surface of the effloresence adhered or hardened on a substrate such as concrete, mortal or finishing tile or its near surface with a treating solution comprising 5 liter of a 75% phosphoric acid aqueous solution, 200g of sodium sulfamate, 5 liter of water, and 100cc of a sodium alkylmaleate sulfonate as an anionic surfactant, removing the dissolved efflorescence with a metal spatula when the efflorescence begins to react with the treating solution to dissolve the surface of the efflorescence approximately three second later, allowing the reaction to proceed, again coating the treating solution to perfectly dissolve and remove the left adhered efflorescence, washing the substrate, coating a 6% sodium carbonate aqueous solution on the substrate, and subsequently washing the substrate 2-3min later.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is an efflorescence (commonly called a nasal drool or a white flower phenomenon) that is the most difficult to remove in construction work, maintenance of outer walls, etc. or beauty work, especially outer wall cleaning work. It is the most unsightly because of dirt on the outer wall. The present invention relates to a treatment method in which efflorescence is dissolved and separated from a substrate surface without damaging or degrading the substrate surface.

[0002]

2. Description of the Related Art Among the stains such as stone materials, tiles, unstretched concrete, mortar, etc. that compose outer walls, the most unsightly is efflorescence. (Hereinafter referred to as white sinter) It is particularly often found in brick tiles with a high absorption rate, rough-finished stone materials, and unfinished concrete. Conventionally, there are a chemical method and a mechanical method as a method for removing white-white dirt, and the chemical method has been generally practiced for a long time. This is a pickling method, in which dilute hydrochloric acid is used in combination with a physical and removing method such as a wire brush and keren to roughen the surface of the base material and wash with removed water. However, if the adhered white matter cannot be removed, hydrofluoric acid is applied to remove it. However, these methods have the following harmful side effects. Hydrochloric acid and hydrofluoric acid not only dissolve and erode mortar and hardened cement, but also
It is impossible to remove the acid that has passed through or penetrated the water-absorbing surface of joints, tiles, stones, etc., and has permeated and remained on the back surface of the base material, promoting the neutralization of concrete and mortar. This is an unfavorable situation. In addition, the hydrochloric acid and hydrofluoric acid scattered during the work not only attack the protective coating of iron products and stainless steel / aluminum products, but also kill nearby plants. Hydrofluoric acid is more powerful and not only causes health hazards for workers who apply coating, but it also scatters and adheres to the surface of the glass to etch the surface of shiny tiles (porcelain tiles). Attacks silicon components. It is a situation in which the color and luster of marble etc. are roughly damaged.

[0003]

As construction work for compensating for the above-mentioned defects, as measures for preventing scattering in advance, glass windows, iron products, aluminum materials, etc., planting sheets, vinyl films, etc. Even if it is cured by the above method, it is naturally difficult and practically difficult, and the measures for neutralizing the acid residue chemically have not been implemented yet. In view of the above problems, the object of the present invention is to fix and insolubilize stone materials, tiles, mortar and concrete. In order to remove the white matter and preserve the body, it is necessary to dissolve and remove only the white matter without dissolving or changing the gloss and color tone of the surface of the base material to which the white matter is fixed. It is an object of the present invention to provide a treatment method which can be easily removed by washing with water or wiping even if it scatters and adheres to another substrate and does not damage the surface of the substrate.

[0004]

[Means for Solving the Problem] In construction work, exterior maintenance work, especially exterior cleaning work, the adherence of Chinese white matter is the most unsightly as contamination of the exterior. As a method for dissolving and removing white matter, an anionic surfactant (sodium salt of dialkyl maleate sulfonate) can be added to an aqueous solution of 75% phosphoric acid aqueous solution and sulfamic acid mixture at the place where the white matter is fixed and its peripheral portion. It is characterized in that a treating agent composed of a treating liquid added with is applied to dissolve and remove white matter.

[0005]

[Function] Although various kinds of inorganic substances are also contained in the Chinese white substance, the main component thereof is calcium carbonate, and it is the main component of cement in the hardening process of concrete and attached mortar. It is generated by the hydration reaction of calcium silicate. Calcium hydroxide and other aqueous solutions stick out to the surface of the exterior material, tile joints, and the like, and are fixed by the action of carbon dioxide gas in the air to form mainly water-insoluble carbonate calcium.
Even after hardening of the mortar, if cracks occur, or if vulnerable joints, joints are missing, interfacial peeling of sealing waterproofing of pinholes, joints of joints or induced joints, or infiltration of rainwater from other defective parts occurs, Water-soluble components (mainly lime water) are dissolved and these components overlap each other, and it is difficult to remove them with normal shavings and acid washing. Especially, the water absorption rate is high, and it is porous and water-permeable. It tends to occur in certain brick tiles, rough stones, and unfinished concrete,
In addition, there are many problems that are difficult to remove because the surface is porous and rough. In this way, it is the main component that is produced and adheres to the white flower. By directly applying the efflorescence treatment agent according to the method of the present invention to insoluble calcium carbonate and free lime, the adhered white substance containing calcium carbonate and free lime reacts with each other. It begins to foam and dissolves. The free lime that adheres to the window holding part and the back of the aged, in which dirt and white matter are piled up alternately, repeats the above-mentioned action several times as much as it is piled up.
After that, the weakly acidic component staying on the surface is removed by washing with water, and a 6% aqueous solution of sodium carbonate is applied as a neutralizing treatment material.
As a result of neutralizing the surface of the base material, there was no stain on the part where the white sinter was fixed or around it, and the unsightly white sinter was renewed.

[0006]

EXAMPLE Next, a method for dissolving and removing the efflorescence-fixed substance of the present invention will be described. Example 1 First, an efflorescence treatment agent 1 having the following composition is prepared. 75% phosphoric acid aqueous solution 5l sodium sulfamate 200g water 5l dialkyl maleate sulfonic acid sodium salt 100cc efflorescence treatment agent 1 Apply to white flower stains. About 3 seconds after application, the reaction condition in which the treatment liquid immediately begins to react with the white syrup is that foaming occurs first, and the surface of the white slate gradually begins to dissolve. The dissolved components are removed with a gold spatula, but the reaction of the treatment liquid still remaining continues. When the bubbling of the treatment liquid with respect to the white powder decreases, the dissolution speed also decreases in proportion thereto. Further, the dissolved content is removed with a gold spatula, and the white sinter component is still thinly adhered. Therefore, the treatment liquid is applied once more to completely dissolve and remove the adhered white sinter component, so that the product is washed with water. as a result,
The treatment trace was completely cleaned. Further, thereafter, a 6% sodium carbonate aqueous solution was applied to neutralize the surface of the base material, and after a lapse of a few minutes, water washing was performed.

Example 2 An efflorescence treatment agent 2 having the following composition is prepared. 75% phosphoric acid aqueous solution 1 liter Sodium sulfamate 50 g Water 0.5 liter Dialkyl maleate sulfonic acid sodium salt 50 cc Efflorescence treatment Treatment solution consisting of composition 2 of porcelain tile in which white Chinese matter is produced and its surroundings Apply to joints. Upon application, the immediate treatment liquid begins to react with the Chinese white matter. The reaction situation is increasingly foaming and the surface of the Chinese white matter begins to dissolve. When the dissolved content is removed with a gold spatula, the surface is no longer adhered to the white flower, so it is washed with water. As a result, the treatment marks were completely cleaned. Further, thereafter, in order to neutralize the surface of the base material, a 6% sodium carbonate aqueous solution was applied, and after a lapse of a few minutes, water washing was performed. There is no deterioration in the gloss of porcelain tiles,
The clean side has regenerated.

[0008]

As described above, the method for dissolving and removing the efflorescence-fixed body of the present invention removes the white matter that has been fixed and insolubilized in stone, tile, mortar, concrete, etc.
In order to preserve the skeleton, it has become possible to dissolve and remove only the white flower without dissolving, changing the gloss or changing the color of the surface of the base material to which the white flower is fixed. The most unsightly white-white flower contamination due to outer wall contamination is easy, the surface of the substrate is not damaged and deteriorated, and even if the treatment liquid is scattered to other materials, the work can be performed safely. Due to the pollution of white flowers, the building can be maintained and maintained without degrading the image, which has a remarkable industrial effect.

Claims (2)

[Claims] 1. A mixed solution of 75% phosphoric acid and sulfamic acid, which is fixed or hardened on concrete, mortar, finishing tile, etc., is applied to the surface of efflorescence and the surface in the vicinity thereof. It is characterized in that it is dissolved and removed. Method for dissolving and removing efflorescence-fixed material 2. The anionic surfactant sodium dialkyl maleate sulfonate is added to the mixed solution of phosphoric acid and sulfamic acid according to claim 1. Method for dissolving and removing efflorescence-fixed material