KR910005992B1 - Inorganic persulfate cleaning solution for acoustic materials - Google Patents

Abstract

No content.

Description

Acoustic material cleaning composition

The present invention relates to a white Portland cement, perlite, cement, lime and the like, the surface of the acoustic control, vinyl and plastic materials, cork, inorganic fiber, plastic coated metal The present invention relates to a composition for cleaning acoustic materials including porous cellulosic materials, such as a spray acoustic matrix made of various metals, and a ceiling tile for acoustic control of a wood fiber matrix. The washing liquids currently used to wash such acoustic materials contain chlorine bleach solutions or other solutions containing chlorine as active ingredient. Obviously, a cleaning solution that is used in a similar way to chlorine but does not pose a hazard is desirable. If chlorine can be removed and used, the cleaning process will be much more stable and legal restrictions will be lessened.

Persulfates of alkali metals, especially ammonium persulfate, are widely known as water soluble oxidants and their aqueous solutions are relatively safe when used alone. However, when used in combination with many common organic additives, persulfate decomposes into an extremely short period of time. The stability of the solution must be maintained for a long time to provide sufficient flexibility for cleaning operations without losing its properties over a short time. It should be able to store long-term storage of oxidants such as persulfate in a dry solid state. This will allow long-term storage of the oxidant compared to storing the solution. Moreover, if transporting persulfate in a dry solid state rather than in a liquid state or as a concentrate of the dust removal component in the washing liquid can reduce transportation costs.

According to the present invention, there is provided a cleaning solution for cleaning and a cleaning method with an acoustic material containing at least one alkali metal persulfate or ammonium persulfate as an active oxidation component. This cleaning solution is much safer to use than chlorine and has the same cleaning effect as a solution containing chlorine bleach or releasing chlorine.

Suitable minerals and those that can be used as antioxidants include ammonium persulfate (NH ₄ ) ₂ S ₂ ) ₈ , potassium persulfate KSO ₅ , K ₂ S ₂ O ₈ and sodium persulfate NaSO ₅ , Na ₂ S ₂ O _8, etc. to be. It is preferable to use ammonium persulfate because of its relatively low cost, high water solubility and rapid dissolution. About 2.0% -10% ammonium persulfate is used, preferably about 5.0% -7.0%. All percentages described herein are parts by weight of the final wash liquor used when subjected to acoustical materials, such as spraying. This solution has a long storage stability of about 5-10 days depending on the purity of the water and storage temperature.

Initially, the washing solution is made into two parts, one part contains persulfate, an oxidizing agent, and the other part contains various dust-soluble compounds, alkaline pH regulators and stabilizers, which are extremely stable and have excellent stability, such as precipitates, crystals, colloids, etc. It is relatively free of granular matter. The dust soluble portion of this wash is relatively long in shelf life and therefore easy to prepare, transport and store in concentrates in the factory.

An appropriate amount of persulfate, dust-soluble concentrate, and water are mixed to form the final wash solution. FMC's technical data on ammonium persulfate suggest that dry persulfates should not come in contact with solvents, oils, fats and oils, and oxidative organic compounds. . In addition, FMC's technical data indicate that ammonium persulfate solutions should not come in contact with strong alkaline solutions. Despite the contents of the technical data of the FMC, however, the cleaning solution according to the present invention contains persulfate, but is stabilized in the presence of various organic compounds including solvents, emulsifiers, surfactants, and alkaline solutions, and safely removes oil, dust, and stains. It is used to

Since tap water contains various impurities that promote the decomposition of ammonium persulfate or degrade the cleaning effect, these compounds should be removed or neutralized. Among these compounds are bacteria that contain enough bacteria to prevent water, and are capable of decomposing various ions or persulfates, such as Ca ⁺² and Mg ⁺² , which react with the washing liquid to precipitate alkali and other ingredients in the washing liquid. It contains Cu ⁺² ions that act. The use of edible tap water solutions usually minimizes the reactions caused by persulfates and possible bacteria. This reduces the effects of various ions in hard water using chelatin agents such as nitriloacetic acid derivatives. Generally, it is used in the concentration range of about 0.03% -0.3%, and about 0.05% -0.1% is effective. Preferred chelating agents are hydroxyethyl ethylene diamine triacetic acid tri-sodium salt, which is marketed by Dow Chemical under the trade name of "VERSENOL 120" and commercially available under the trade name "HAMPOL 120" from the Hampshire Chemical Department of WR Grace. Residual staining of tobacco is removed much more effectively than the conventional VERSONAL 100 '(which is ethylene diamine tetraacetate tetrasodium salt from Dow Chemical) of VERSONOL 120 or HAMPOL 120. Generally suitable are alkali metal salts, ammonium salts and organic amine salts of polyamino carboxylic acids, for example mono, di, tri and tetrasodium salts of ethylene diamine tetra acetic acid and diethylene triamine pentaacetic acid, citric acid and Salts of oxycarboxylic acids such as gluconic acid, polyataconic acid and polyacrylic acid. Other suitable nitriloacetic acid derivatives include trans-1,2-diamino-cyclohexane tetraacetic acid monohydrate, α-d-glocoheptonic acid, diethylene triamine pentaacetic acid: benzotriazole and diglycine disodium salt, etc. There is this.

Mineral soil suspending agents are used to make a suspension of soil that is removed from the acoustic material. This makes it possible to minimize the formation of thick residues which become impermeable to the oxidant due to their thick thickness. Preferred soil suspending agents include sodium tribasic acid, sodium trihexanoate, potassium tribasic acid, tetrasodium pyrophosphate, tetrapotassium pyrophosphate, sodium tetrachloride, sodium hexamethane phosphate, or potassium, triammonium triammonium, and the like. There are phosphates of the same alkali metal. Other suitable soil suspending agents are silicates, aluminates, borates and carbonates of alkali metals. Polyacrylic acid polymers and polyacrylamides may also be used, with typical soil suspending agents in the range of about 0.1% -4.0%, preferably in the range of about 0.2% -0.5%.

There are overlaps between some soil suspending agents and chelating agents, but it is not clear to distinguish between them. For example, inorganic polyphosphates also serve two functions as water softeners (eg chelating agents) and soil suspending agents.

A water-soluble hydrotrope is used in the dust-soluble solution to maintain the solution in a single phase and to stabilize the washing solution made by mixing the dust-soluble solution and the oxidizing agent. Preferred combustible materials are Na, K or ammonium salts of toluenesulfonic acid or xylenesulfonic acid or phosphate ester surfactants or mixtures thereof and representative phosphate ester surfactants are those sold by Triton H-55 and H-56 (Rohm & Hass). Alkaphos QC (manufactured by Alkaril Chemicals), Gafac RP-710 (manufactured by GAF) and T-Mulz 734, 734-2, 598 and 5984 (manufactured by Thampson-Hayward Chemical). Other combustible materials include disodium ethoxylated nonyl phenol half esters of tetrasodium N- (1,2-dicarboxyl) -N-octadecyl sulfosuccinate and sulfosuccinic acid. Commercially available from American Cyanamid. The concentration of these flexural agents in the wash liquor is broadly about 0.5% -3.0%, preferably about 0.8% -1.3%.

Cleaning compounds such as surfactants or emulsifiers are used to emulsify the dust particles remaining in the acoustic material after the initial physical cleaning process, such as vacuum cleaners and brushing. The surfactant or emulsifier should be one that is not reactive with persulfate, preferably at least one of ethoxylated alkylphenols such as octylphenol or nonylphenol, ethoxylated fatty acid esters, ethoxylated alcohols, sulfates of fatty acids and ether sulfates Or use a mixture of these. Suitable for the use of emulsifiers in conjunction with surfactants are polyethylene glycol 400 sesquioleates which are commercially available from Emery Industries under the tradename EMEREST 2847. Other suitable cleaning agents include anionic detergents such as soaps, alkylaryl sulfonates, alkylsulfates, alkanesulfonates, olefin sulfonates, fatty acid acethionates and fatty acyl taurides. Nonionic, zwitterionic and cationic cleaning agents which are hardly affected in solution by bleach can also be used. In this case, the concentration of the surfactant and / or the emulsifier for the washing liquid is about 0.5% -4.0%, preferably about 0.5% -1.5%.

Solvents miscible with water are used to dissolve the organic components in the dust. Typical solvents include isopropyl alcohol, acetone, ethyl alcohol, ethyl and butyl monoesters of ethylene glycol, and methyl ethyl ketone. The solvent and the cleaning agent are combined by a water soluble agent, which combines the non-liquid and liquid phases of the dust-soluble solution. The concentration of the solvent is about 1.0% -6.0%. About 0.5% -3.5% is preferred.

A base such as NaOH or KOH is added to the dust-soluble solution to adjust the pH of the wash solution to about 8-9, which allows for the proper activity of ammonium persulfate and to prevent ammonia odors. If ammonium persulfate is used, the pH of a typical concentrate at the time of preparation at the factory is about 13-14. Usually the KOH concentration range is about 1% -6% relative to the concentrate, but this range can be varied widely depending on the choice of additives. Ammonia does not smell or persulfates other than ammonium persulfate may be used and the pH may be increased to about 9-11. This slightly increases the activity of persulfate, but shortens the life of the wash solution and increases the risk of skin damage to the user. NaOH or KOH is used in excess to supplement the activity of the solvent.

Examples of the composition according to the present invention are as follows,

TABLE 1

Porous acoustic control is first performed by brushing and / or vacuum cleaning acoustic materials, such as tiles, followed by the addition of a wash solution prepared from concentrate and dry ammonium persulfate to the physically cleaned tiles, which is preferably sprayed. Except for metal fittings such as mild steel, copper, copper alloys, nickel, etc., which promote the decomposition of persulfate, the same spraying system as in the case of chlorine eliminates the need to purchase new equipment. . The solvent action of the cleaning agent and the cleaning liquid relaxes the dust from the tile surface and redisperses the dust in the tile in the same way. This results in uniform oxidation of dust, tobacco and cooking residues by persulfate and conversion to neutral colors. Once this is done, simply dry the tiles.

When using cleaning solutions containing persulfate, avoid direct contact with the sprayer and use sprayers or dust goggles, face masks and rubber gloves, which are usually used by painters. However, unlike chlorine, the spraying of the composition according to the present invention does not cause hygiene problems even to those outside the workplace because no toxic gas is diffused except that there is a small amount of solvent.

Apparently, various specific examples according to the present invention are possible without departing from the spirit of the present invention. For example, if the quality of tap water is extremely good and the hardness is very low, the amount of chelating agent used can be reduced below a certain concentration level. Furthermore, the amount of phosphate ester (or the like) surfactant used as a water-repellent agent may be increased or exceeded to the stated concentration limit, thereby partially or fully functioning in response to polyoxyethylene-9-oltyl (or nonyl) phenolic surfactants. Can be. In addition, when the acoustic tiles are extremely dirty, it is necessary to use the cleaning solution twice, even if the concentration of the persulfate is large, that is, the pH is increased. If necessary, add a brightening agent such as benzotriazole, sodium nitrite, sodium metasilicate or sodium benzoate and corrosion inhibitor. Commercially available varnishes such as commercially available CONCOFLOR 900 or CONCOFLOR DG69 (manufactured by Continental Chemical) and Hiltamine Arctic White CWD (manufactured by Hilton Davis) may be used. Alkali metal salts or ammonium salts of salicylic acid can also be used.

Claims (3)

It contains the oxidizing agent selected from ammonium persulfate and persulfate of alkali metal and consists of the following components (a)-(g), maintaining the single phase of the solution and mixing with the solution to which each component is added Storage stability is at least about 3 days when a mixture of a pH adjusting agent and an oxidizing agent, a non-reactive washing agent, a solution to which each component is added, and an oxidant solution are used to maintain the pH of the water-repellent agent and the washing solution at least about 8-9. Washing liquid for acoustic material to about 10 days. (a) Oxidizer solution 2.0% -10% (b) 0.03% -0.3% chelating agent (c) 0.1% -4.0% mineral soil suspension (d) 0.5% -3.0% flexibilizer (e) 0.5% -4.0% detergent (f) 1.0% -6.0% solvent miscible with water (g) the remainder for dilution of drinking water 2. The components and oxidizing agent according to claim 1, wherein each component and oxidant are (a) an inorganic persulfate selected from ammonium persulfate, sodium persulfate and potassium persulfate, (b) nitriloacetic acid derivatives, polyaminocarboxylates, oxycarbs Chelating agents selected from salts of acids and trisodium salts of hydroxyethyl ethylenediamine triacetate, (c) inorganic polyphosphates such as tetrapotassium tetrapotassium, sodium triphosphate, sodium xylene sulfonate or potassium, phosphate ester surfactants, etc. And soil suspending agents selected from mixtures thereof, (d) ethoxylated alkylphenols, ethoxylated fatty acid esters, ethoxylated alcohols, sulfates of fatty acids, sulfates of ethers, polyoxyethylene octyl (or nonyl) phenols and polyethylene glycols Surfactants selected from sesquioleates, (e) sodium or potassium xylene sulfonates, phosphate ester surfactants And a pH adjusting agent selected from among the following: a water-repellent agent selected from the agent and mixtures thereof, (f) a solvent selected from isopropyl alcohol, ethyl alcohol, acetone, methyl ethyl ketone and ethylene glycol monobutyl ether, (g) a KOH, NaOH and mixtures thereof. Washing solution by addition. The washing liquid according to claim 1, wherein the washing liquid is added by adding each component and an oxidizing agent in the washing liquid at the following concentrations. (a) Mineral Persulfate 5.0% -7.0% (b) 0.05% -0.1% chelating agent (c) 0.2% -0.5% mineral soil suspension (d) flexural agent 0.8% -1.3% (e) 0.5% -1.5% surfactant or emulsifier (f) solvent 1.5% -3.5% mixed with water