JP3313333B2 - Aqueous composition for removing contamination on the surface of existing exterior glass - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an acidic fluoride that can be treated is severe contamination by burnt or water red such as existing outside Somado glass <br/> scan the "darkening" chemically The present invention relates to an aqueous composition for removing contamination of the surface of an existing ammonium-based exterior glass.

[0002]

2. Description of the Related Art Front glass and show window glass for commercial facilities such as hotels, restaurants and department stores, special glasses such as atrium top lights, glass for office buildings and public facilities, bathrooms for inns and golf courses, and the like. Exterior glass is used everywhere. The main component of the glass is silica sand (SiO2),
They are soda ash (Na2O) and lime (CaO). When moisture adheres to this glass surface for a long time, it gradually diffuses from the surface into the glass, hydrolyzes soda ash,
It remains on the glass surface as an alkaline solution.

[I]

_{SiO2 + Na2O + (χ +2)} H2O → H2SiO3 · χ H2O + 2NaOH

[0003] If this component is immediately washed away,
The condition of the glass surface does not change appreciably. However, in this state, drying and wetting are repeated, and furthermore, carbon dioxide (CO2) and sulfur oxides (S
_Oχ ) and nitrogen oxides ( _NOχ ) cause the following chemical reaction.

[Chemical II]

 2NaOH + CO2 → Na2CO3 + H2O

[0004] These products (NaOH, Na2CO
3) gradually affects the silicon structure, which is the main component of the glass, and causes chemical changes on the glass surface, such as gelation of silicon. As a result, the glossiness of the glass is reduced and the glass becomes cloudy, resulting in a “white turbidity phenomenon”.
Under conditions where the cycle of adhesion, evaporation and drying is frequently repeated, a scale-like phenomenon, which is scale-like damage, may occur. In addition, when a thin film is formed on the glass surface, it causes light interference and looks like a rainbow color "iris phenomenon"
In recent years, especially in the city center, near a high-traffic arterial road, near factories and incineration plants, a "darkening phenomenon" caused by dust, exhaust gas, and sulfur dioxide gas may be observed. In particular, the glass surface contaminated by "darkening" can hardly be removed by a normal cleaning agent. The only exception is the use of hydrofluoric acid. Hydrofluoric acid also removes such stubborn contamination, "darkening," but hydrofluoric acid is a toxic substance that is difficult to handle and is not common. Accordingly, a material using ammonium acid fluoride as a raw material has been developed as a material comparable to hydrofluoric acid. As a generally known cleaning agent, a commercially available product using ammonium acid fluoride as a raw material, for example, sold under the trade name "Clinstone" manufactured by Clinston Co., Ltd., has achieved a certain effect. However, the use of this detergent has no effect on the above-mentioned stubborn contamination, and there is a need for the development of an excellent detergent.

[0005]

The present invention is to challenge it to solve the above-existing on the exterior glass <br/> Las surface, novel ammonium acid fluoride-based cleaning to remove a stubborn contamination as described above, "darkening" No agent is provided.

[0006]

Means for Solving the Problems The inventors of the present invention have made intensive studies on this problem, and as a result, have completed the present invention. In other words, the present invention is designed to prevent contamination of the existing exterior glass
An aqueous composition used for removal, comprising 10 to 30% by weight of ammonium acid fluoride, 0.5 to 10% by weight of a surfactant, and an organic acid and / or an inorganic acid (excluding hydrofluoric acid).
Ku) look contains 5 to 40 wt%, a decontamination aqueous composition of the existing outer glass surface, wherein this <br/> and free hydrofluoric acid. As the acidic ammonium fluoride used in the present invention, one produced usually using 1 mol of hydrofluoric acid and 0.5 to 1 mol of ammonia gas as raw materials can be used. As the surfactant, an anionic surfactant, a nonionic surfactant, a cationic surfactant, an amphoteric surfactant, and the like can be used. Alternatively, an anionic surfactant is preferred in view of the stability of the aqueous composition. Further, as the organic acid and the inorganic acid, those having good compatibility with the acidic ammonium fluoride solution are used. As the organic acid, those having 5 or less carbon atoms having a hydroxyl group or a carboxyl group are preferable. Citric acid, glycolic acid and the like are preferable, and as the inorganic acid, generally known inorganic acids other than hydrofluoric acid can be used, and examples thereof include hydrochloric acid, sulfuric acid, and phosphoric acid. These organic acids and inorganic acids are used alone or in combination. The acidic ammonium fluoride, the surfactant, and the organic acid and / or the inorganic acid (excluding hydrofluoric acid) are already used in the present invention.
In the aqueous composition for removing contamination on the exterior glass surface , 10 to 30% by weight, preferably 15 to 30% by weight of ammonium acid fluoride is used.
In the range of 25% by weight, 0.5 to 10% by weight of surfactant
Preferably, the range is 1 to 4% by weight, the organic acid is 5 to 40% by weight, preferably the range is 15 to 25% by weight, and the inorganic acid is 5 to 5% by weight.
It can be used in the range of 40% by weight, preferably 10 to 30% by weight. The method for cleaning the glass surface using the aqueous composition for removing contamination of the existing exterior glass surface described above,
The aqueous compositions was uniformly coated on the target glass surface was included in the waste, thereby staying the aqueous composition for 15 seconds. Then wipe the glass surface with a wet rag and drain off the water with a squeegee.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below.

Example 1 An aqueous solution composed of 20% by weight of ammonium acid fluoride, 25% by weight of phosphoric acid, 2% by weight of an anionic surfactant and 53% by weight of water was prepared.

Example 2 Ammonium acid fluoride 20% by weight, glycolic acid 10
Wt%, 2 wt% anionic surfactant, 68 wt% water
The resulting aqueous solution was prepared and used as a cleaning agent 2.

Example 3 Ammonium acid fluoride 20% by weight, glycolic acid 20
Wt%, anionic surfactant 2 wt%, water 58 wt%
An aqueous solution was prepared, and this was used as a cleaning agent 3.

Example 4 Ammonium acid fluoride 20% by weight, glycolic acid 30
Wt%, 2 wt% anionic surfactant, 48 wt% water
The resulting aqueous solution was prepared and used as a cleaning agent 4.

Comparative Example 1 An aqueous solution comprising 20% by weight of ammonium acid fluoride and 80% by weight of water was prepared.

Comparative Example 2 An aqueous solution consisting of 20% by weight of ammonium acid fluoride, 25% by weight of phosphoric acid, 10% by weight of glycolic acid, and 45% by weight of water was prepared.

Comparative Example 3 An aqueous solution comprising 20% by weight of ammonium acid fluoride, 2% by weight of an anionic surfactant and 78% by weight of water was prepared.
This was designated as Comparative Cleaning Agent 3.

Comparative Example 4 An aqueous solution comprising 6% by weight of hydrofluoric acid and 94% by weight of water was prepared, and this was used as Comparative Cleaning Agent 4.

Comparative Example 5 The trade name "Clinstone" was used as Comparative Cleaning Agent 5.

The cleaning effect of each of the cleaning agents of Examples 1, 2, 3, 4 and Comparative Examples 1, 2, 3, 4, and 5 was examined by the following method. In relatively large road contact and location building Kawasaki traffic, long been used to select the outside Soga lath occurring the "darkening" phenomenon, the portion where contamination is likely to uniformly in the glass surface Divide into nine equal parts,
Various detergent and Comparative Examples 1, 2, 3, 4 according to Examples 1, 2, 3, 4 shown above, was washed with the washing surface using the comparative detergent by 5. The cleaning method was such that each cleaning agent was contained in a waste cloth and uniformly applied to the surface of the target glass, and the cleaning agent was retained for 15 seconds. Thereafter, the glass surface was wiped with a wet rag, and water was removed with a squeegee. Immediately after cleaning
The cleaning effect against was evaluated visually according to the following criteria. 1. 1. A state in which contamination "darkening" is clearly left ... 1 2. There is a part where contamination "darkening" remains ... 2 3. 3. A little bit of "darkening" remains. Slight contamination "darkening" remains 4 5. A state in which no contamination “darkening” is left at all .... 5 The above results are summarized in Table 1.

[0018]

[0019]

The contamination of the surface of the existing exterior glass according to the present invention.
By using the removed aqueous composition can be removed to "darkening" of the glass surface is difficult contamination to be removed prior industrial use value is very large.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-52-144020 (JP, A) JP-A-61-266581 (JP, A) JP-A-63-283028 (JP, A) 87680 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) C03C 23/00 C09K 13/00

Claims (1)

(57) [Claims] 1. Use for removing contamination on the surface of an existing exterior glass
Aqueous ammonium composition , comprising ammonium acid fluoride 1
0 to 30% by weight, surfactant 0.5 to 10% by weight, organic acid and / or inorganic acid (excluding hydrofluoric acid)
Look containing by weight%, decontamination aqueous composition of the existing outer glass surface, wherein the free hydrofluoric acid.