JPS6317997A - Cleaning composition - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a cleaning agent composition, and more specifically, a cleaning agent composition that can efficiently remove stains from wood, stone, ceramic materials, plastic materials, etc. Regarding.

(Prior art) Many houses, buildings, etc. have been constructed as residences and offices, and these buildings use a lot of cement, mortar, soil, paint, etc. when they are constructed. Walls, ceilings, floors, etc. are often contaminated by cement, mortar, soil, paint, etc., and these stains must be thoroughly cleaned when a building is completed.

In addition, even if conventional wood is new, it is left in water at a wood storage center for a long period of time before it is processed into lumber, so even after sawing, there are stains and scum on the surface, and these stains must be thoroughly removed. It is necessary to do so.

Furthermore, due to long-term use of buildings, pillars, walls, floors, ceilings, etc. often become extremely dirty, and it is necessary to clean these dirts about once every few years.

Conventionally, surfactants, mineral oil, alkaline agents, bleaching agents, etc. have been used to remove the above-mentioned stains from building materials and houses. Since it is almost impossible to remove with cleaning agents, it is necessary to perform operations such as scraping off the dirt using physical force, which results in the problem of damaging building materials and the like.

It is also known that acetic acid, an organic acid, and nitric acid, an inorganic acid, are used to remove stains from cement, mortar, etc.; however, acetic acid has a low cleaning effect at low concentrations, and is irritating at high concentrations. Not only does it have a strong odor and is very dangerous, but its cleaning effect is also insufficient. On the other hand, nitric acid is similarly ineffective at low concentrations, and at high concentrations it emits smoke and is difficult to handle, and its strong oxidizing action significantly damages the wood itself, making it practically unusable.

In addition, stains on pillars, etc. due to long-term use are extremely difficult to remove with detergents, etc., as the stains have penetrated into the interior of the wood, and cleaning operations must be repeated many times. The problem is that it can't be done. Additionally, stains on the surface can be similarly diluted to some extent by treatment with bleach, but this requires repeated bleaching many times, and even then, sufficient cleaning is difficult.

Therefore, there is a need for a cleaning agent and a cleaning method that can easily remove the stains from building materials and the like.

(Means for Solving the Problems) As a result of intensive research in response to the demands of the prior art as described above, the present inventors have discovered that by using a mixture of specific inorganic acids, various types of stains on building materials as described above can be solved. The present invention was completed based on the finding that .

That is, the present invention is a cleaning composition characterized by comprising an aqueous solution containing hydrofluoric acid and phosphoric acid.

Next, the present invention will be explained in more detail.

The present inventor has conducted various studies on the removal of stains from building materials, etc., as described above, and has attempted to remove stains on wood caused by cement, mortar, etc., using various acids, since these stains are alkaline substances. However, these acids are corrosive in high concentrations, so it is difficult to remove the stains from mortar. In addition to decomposing and removing, the wood itself that is being cleaned turns yellow.
It could not be used because it turned black and emitted smoke, which was dangerous to workers, and corroded the surrounding area. On the other hand, if these acids are used in low concentrations,
Although problems such as smoke generation were reduced, the cleaning power decreased, and this was also not effective. We also considered organic acids such as acetic acid, but
These organic acids cannot be called effective detergents in various respects.

Therefore, the present inventor conducted research on a number of mixtures of inorganic acids and organic acids, and found that a mixture of acids, in which a small amount of phosphoric acid was added to hydrofluoric acid, was effective against cement, mortar, etc. attached to wood, etc. It decomposes and removes soil and other dirt in an extremely short time, emits little smoke, and does not discolor or alter the material to be cleaned, such as wood, and is extremely easy to clean by simply applying it to contaminated wood. We have discovered that it is possible.

The cleaning agent composition of the present invention as described above is an aqueous acid solution prepared by adding phosphoric acid to hydrofluoric acid. Hydrofluoric acid is easily available from the market and can be used at any concentration, but Generally, it is used in an aqueous solution of 1 to 65% by weight, but the concentration with the highest cleaning effect and ease of handling is a concentration of about 5 to 40% by weight.

In the present invention, it is necessary to add a small amount of phosphoric acid to such hydrofluoric acid, and if such phosphoric acid is not added, that is, hydrofluoric acid alone or phosphoric acid When other acids are added, a sufficient cleaning effect cannot be obtained at low concentrations, whereas at high concentrations, although there is a cleaning effect, the wood itself discolors from brown to blackish brown and is unusable due to smoke, etc. Met. All of these drawbacks of hydrofluoric acid are eliminated by the addition of phosphoric acid, and within the above concentration range, it can extremely effectively clean contaminated wood, etc. without causing any discoloration or deterioration of the wood itself. It is.

The phosphoric acid used in the present invention may be any type of phosphoric acid such as orthophosphoric acid, metaphosphoric acid, polyphosphoric acid, birophosphoric acid, etc., but the most preferred phosphoric acid is orthophosphoric acid, that is, orthophosphoric acid. Such phosphoric acid is used in an amount of 0.1 to 50 parts by weight, preferably 0.5 to 2 parts by weight, per 100 parts by weight of hydrofluoric acid.
It is preferable to add it in a proportion of 0 parts by weight. Addition amount is 0.
If the amount is less than 1 part by weight, it will be difficult to prevent discoloration and deterioration of wood caused by hydrofluoric acid alone, and 5 parts by weight.
If the amount used exceeds 0 parts by weight, phosphoric acid itself is nonvolatile, so a large amount of phosphoric acid will remain in the wood after cleaning.
This is not preferred because it requires a water washing operation after cleaning.

Also, regarding the timing of adding phosphoric acid to hydrofluoric acid, it is possible to add it in advance before use, or mixing both immediately before use will have the same effect. It may also be mixed with an acid on the wood, both of which can provide excellent cleaning effects.

Further, the concentration of the aqueous solution of the mixture of hydrofluoric acid and phosphoric acid as described above is in the range of about 1 to 50% by weight, more preferably 5 to 40% by weight.

If the concentration is too low, the cleaning effect will be insufficient, and if the concentration is too high, it may be dangerous to handle.
Further, it is not preferable because it is necessary to remove the attached acid after use.

The cleaning composition of the present invention as described above is mainly effective for removing stains from wood, but it is also effective for removing stains from other materials that are difficult to be attacked by acids, such as plastic materials, painted surfaces, stones, ceramic materials, etc. It is also effective for removal.

(Action/Effect) The cleaning agent composition of the present invention as described above is useful for removing stains from any acid-resistant material, but a particularly useful example is stains on wood, which tend to adhere during construction. It is very useful for stains such as cement, mortar, soil, paint, etc. By simply applying it to the areas where these stains have adhered, these stains will be sufficiently broken down within a few minutes to several hours. The wood surface appears as if it were a completely new wood surface.

An additional unexpected benefit is that stains on old wood, such as wood with stains from years of use or wood smoldering from smoke, can be broken down and removed very easily, making the wood look like brand new wood. .

Therefore, according to the present invention, stains on wood caused by cement, mortar, soil, paint, etc. that occur during construction, which were previously difficult to clean, can be easily removed by simply applying the cleaning agent composition of the present invention. It can be easily disassembled and removed, and the problem of removing stains on wood during construction or during storage of wood in the prior art has been solved.

In addition, the cleaning composition of the present invention is very effective against stains and soot stains on pillars, floors, ceilings, walls, etc. due to long-term use, and simple cleaning was almost impossible with conventional techniques. These stains can be easily removed.

Next, the present invention will be explained in more detail with reference to Examples and Comparative Examples. Note that "%" or "%" in the text is based on weight.

Example 1 (Preparation of a cleaning agent composition) Commercially available orthophosphoric acid (concentration 100%) was added in the following ratio to 100 parts by weight of commercially available hydrofluoric acid (concentration 65%), and water was added. In addition, the following cleaning composition of the present invention was prepared.

Cleaning agent Crush the bottom of the dish ↓ Hydrofluoric acid 100 parts Phosphoric acid 0.5 parts Water 100 parts Cleaned 1 part Hydrofluoric acid 100 parts Phosphoric acid 3 parts Water 150 parts Hydrofluoric acid 100 parts Phosphoric acid 5 parts Water 200 parts Detergent composition 4 Hydrofluoric acid 100 parts Phosphoric acid 20 parts Water 400 parts Example 2 (Cleaning example) Each of the cleaning agent compositions of the present invention in Example 1 , apply to cement, mortar field, and soil-stained wood surfaces with a spatula for 30 minutes.
After being left for a minute, the dirt on the wood was sufficiently decomposed and the surface looked almost the same as newly planed wood.

Example 3 (Cleaning Example) Each of the cleaning agent compositions of the present invention in Example 1 was applied with a spatula to the surface of an old wood pillar that had many stains on the surface and was darkened overall, and was left for 1 hour. When left to stand, stains and other dirt were sufficiently decomposed and removed, leaving a clean surface that looked like new wood.

Comparative Example As cleaning agents for Comparative Examples, 32.5%, 26%, 22% and 13% hydrofluoric acid were prepared, and these cleaning agents were used to clean dirty wood in the same manner as in Examples 2 and 3. In all cases, the wood turned dark brown when used.

Further, in the case of 3% and 1% phosphoric acid aqueous solutions alone, almost no stains were removed.

Claims (4)

[Claims] (1) A cleaning agent composition comprising an aqueous solution containing hydrofluoric acid and phosphoric acid. (2) Phosphoric acid is 0.0% per 100 parts by weight of hydrofluoric acid.
A detergent composition according to claim 1, in a proportion of 1 to 50 parts by weight. (3) The cleaning agent composition according to claim (1), wherein the phosphoric acid is orthophosphoric acid. (4) The detergent composition according to claim (1), wherein the total concentration of acids is 1 to 50% by weight.