JP2001032000A - Glass cleaning agent - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide glass cleaning agent capable of readily removing stains on glass including an internal finishing material firmly adhered to the inner surface of a Braun tube which have been difficult to peel and remove. SOLUTION: A glass cleaning agent is composed of a slurry comprising a carrier containing active components in a micro-organism culture medium obtained by dipping a finely pulverized carbonaceous substance in the microorganism culture medium (OME) in which (a) aerobic microorganisms, (b) anaerobic microorganisms, (c) at least one basidiomycete belonging to Pleurotus, and (d) photosynthetic bacteria live together and which contains enzymes derived from the metabolites of these microorganisms and a carbon decomposition enzyme, dissolving it therein, and drying the resulting culture medium, water or an aqueous medium and preferably, an OME diluting solution.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a cleaning agent for glass and a method for cleaning glass. More specifically, the present invention relates to a cleaning agent and a cleaning method for cleaning a glass surface on which a fluorescent surface or the like of a cathode ray tube has been difficult to clean based on the action of microorganisms.

[0002]

2. Description of the Related Art Conventionally, a cathode ray tube for displaying an image on a television, a personal computer or the like is formed of a panel, a funnel and a neck, and emits a phosphor while scanning an electron beam on a phosphor screen formed on the inner surface of the panel. Thus, an image is obtained. The fluorescent screen of the color CRT is
It is formed of phosphors of three colors, red, green and blue, and graphite. That is, these phosphors are attached to the inner surface of the glass panel in a predetermined pattern in the form of stripes or dots, and the gaps between these phosphor stripes or dots are filled in black with graphite to form a black matrix. I have.

[0003] In the production of cathode ray tubes, conventionally, a panel having a defect in forming a fluorescent screen on the inner surface of the panel is regenerated by washing the phosphor and graphite once adhered, thereby regenerating the inner surface of the panel. Then, a phosphor screen is formed again. In this case, it is necessary to prevent the panel from being physically impacted in order to maintain the smoothness of the glass surface. Therefore, cleaning is performed by showering a solution of hydrogen fluoride, which is a strong oxidizing agent, and a nitric acid solution. In particular, a hydrogen fluoride solution is an essential requirement for cleaning graphite which is difficult to remove.

[0004]

Since such a cleaning step requires about 30 minutes to 1 hour, the amount of cleaning per day is limited, and a highly efficient cleaning method has been desired. Furthermore, since hydrogen fluoride removes graphite by corroding the glass surface, the inner surface of the panel is attacked in the phosphor portion where graphite is not attached, and as a result, the inner surface of the panel is consequently damaged. In some cases, irregularities were formed on the surface, and the phosphor screen could not be re-formed. Furthermore, the used hydrogen fluoride solution needs to be drained after performing a special treatment, which is inconvenient in terms of waste liquid treatment cost. Further, the hydrogen fluoride solution has an irritating odor and is extremely toxic, and when touched on the skin, significantly harms the contact area.
Therefore, handling such a hydrogen fluoride solution requires attention to the safety of the working environment.

In order to solve such a problem, a phosphor screen formed by attaching a phosphor and graphite to the inner surface of a glass panel of a cathode ray tube is immersed in a cleaning solution which is an aqueous solution of an oxidizing agent. A method of irradiating an ultrasonic vibration to a fluorescent screen in the cleaning liquid to perform cleaning is described. In this method, the washing solution is composed of a strong oxidizing acid such as potassium permanganate, potassium dichromate and pH.
It is described that a mixed aqueous solution with sodium hydroxide for adjusting the water content is preferable. However, even if these solutions are used, cleaning is not sufficient, and yttrium (Y) contained in potassium permanganate or the like or a phosphor is not used.
The problem of the treatment of waste liquid containing heavy metals such as (Eu), zinc (Zn) and silver (Ag) still remains, and the cleaning effect cannot be said to be sufficient.

[0006]

Therefore, there has been a need for a cleaning agent and a cleaning method for glass such as a cathode ray tube, which can replace such chemicals. Therefore, the object of the present invention is to
An object of the present invention is to provide a cleaning agent applicable to a fluorescent screen of a cathode ray tube based on the action of microorganisms without using a chemical.

[0007]

Means for Solving the Problems As a result of intensive studies in view of the above object, the present inventor has found that a carrier containing an active ingredient in a microorganism culture solution containing a group of microorganisms having different properties and an enzyme which is a metabolite thereof is provided. And applied to the surface of such glass,
The present inventors have found that a glass surface containing a heavy metal or the like typified by a fluorescent screen of a cathode ray tube can be easily cleaned by wiping, and the present invention has been completed.

That is, according to the present invention, the refined carbonaceous material is used for (a) an aerobic microorganism group, (b) an anaerobic microorganism group, (c)
A basidiomycete belonging to at least one species of Pleurotus, (d)
Immersed in a microbial culture solution (hereinafter referred to as OME), wherein the carbonaceous matter is symbiotic with photosynthetic fungi and contains enzymes derived from these microorganism group metabolites and carbon-decomposing enzymes; The present invention relates to a cleaning agent for glass, comprising a carrier containing an active ingredient (hereinafter referred to as DCP) in the microorganism culture solution obtained by drying and a slurry containing water or an aqueous medium. OM as an aqueous medium for the cleaning agent
It is preferred to use E. Thus, the cleaning agent based on DCP can be suitably used for cleaning the fluorescent screen of a cathode ray tube, cleaning a used frit containing zinc, and the like.
Such a cleaning agent can easily treat dirt attached to the glass surface without using a strong acid such as hydrofluoric acid.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.
OME used to manufacture DCP in the present invention
Is obtained by culturing an aerobic microorganism and a specific basidiomycete in a bioactive agent previously applied by the present inventors as a specific culture medium, and then culturing an anaerobic microorganism in this culture solution. Different microbial groups that produce carbon-degrading enzymes by adding a plant-derived carbon source to a mixture of microorganisms and their metabolite enzymes coexist, and these enzymes as metabolites and carbon-degrading enzymes A solution that contains The production method and characteristics of such a culture solution are described in detail in an international patent application (PCT / JP99 / 2346, not disclosed) filed by the present applicant. Also, OME
Is sold by Orient Green Co. under the name Dash Aminon AZ1000MKII. This O
ME has been shown to be harmless in oral toxicity tests in mice, as disclosed in the international patent application, and is applicable to various subjects. In addition, it has the following features.

It has a carbonaceous dissolving action. It can be assumed that the OME active ingredient contains a carbon-degrading enzyme. The following microbial / enzymatic reactions occur selectively depending on the substance to be treated. Hydrolysis reaction a. RCO-NHR ′ + H ₂ O → RCOOH + R′NH ₂ b. RCO-OR ′ + H ₂ O → RCOOH + 4R′OH c. RCO-SR ′ + H ₂ O → RCOOH + 4R′SH d. _{R-CH-OR '+ H} 2 O → RH + HO-CH-OR' ( wherein, R, R 'each represent independently optionally substituted hydrocarbon group.) II. Cleavage reaction a. RCOOH → RH + CO ₂ b. _{HOCRH-CR'H-OH → RCH 2} OH + R'CHO ( where, R, R 'each represent independently optionally substituted hydrocarbon group.) III. Redox reaction a. AH ₂ + B → A + BH ₂ b. AH ₂ + O ₂ → A + H ₂ O ₂ IV. Dehydrogenation reaction a. CRR'H-CR "H-OH → RR'C = CR" H + H 2 O b. CRR′H—CR ″ H—NH ₂ ＲRR′CＣＲCR ″ H + NH ₂ (wherein R, R ′, and R ″ each independently represent a hydrocarbon group that may be substituted.) V. Dehydration Halogenation reaction a. RCX-CR'H → RC = CR '+ HX (wherein R represents an optionally substituted hydrocarbon group and X represents a halogen atom) VI. Substitution reaction a. RXCH ₂ + H ₂ O → RCH ₂ OH + HX b. RXCH ₂ + HS ⁻ → RCH ₂ SH + X ⁻ (wherein, R represents a hydrocarbon group which may be substituted, and X represents a halogen atom). Elimination reaction of OH and halogen

Heavy metal removing action OME has an action of removing heavy metals such as zinc, lead, tin, nickel, chromium, copper, cobalt, manganese, mercury, cadmium, and dross components in semiconductors. Although it is not clear by what mechanism heavy metals are removed, as a result of the present inventor's experiment on treatment of plating waste liquid and semiconductor waste liquid, it was found that these heavy metals can be substantially removed. Decomposition action of organic compound By the above dehalogenation action, an organic halogen compound, for example, a halogen-substituted aromatic organic compound such as dioxins, polychlorinated biphenyls, and chlorobenzene, tetrachloroethylene, trichloroethylene, dichloromethane, carbon tetrachloride, 1,2 -Dichloroethylene, 1,1-
Dichloroethylene, cis-1,2-dichloroethylene,
It can decompose aliphatic organic halogen compounds such as 1,1,1-trichloroethane, 1,1,2-trichloroethane and 1,3-dichloropropene, as well as decompose pigments such as azo dyes, methyl mercaptan, and captans Has the action of decomposing organic compounds such as, indole and skatole.

Decomposition of inorganic compounds Nitrogen reduction: Anaerobic and facultative anaerobic chemoheterotrophs contained in OME have a mechanism of either anaerobic respiration or fermentation. Anaerobic respiration is essentially the same biochemical pathway as aerobic metabolism (aerobic respiration), where the final electron acceptor of the electron transport chain is nitrate (NO ₃ ⁻ ), sulfuric acid (SO 2) instead of oxygen. ₄ ^2-), fumaric acid or trimethylamine oxide. In the case of NO ₃ ⁻ and SO ₄ ²⁻ , it functions as a reduction product and a final electron acceptor. During the reduction, the denitrifying bacteria, NO ₃ ^{- -} NO ₃ is NO ₂ ^-, and the further reduced _{N 2} O, and the ultimately produce _{N 2} gas, the denitrification in the OM and OME A typical bacterium having is Rhodob.
acter, Bacillus, Cytophaga and the like.

Decomposition of Ammonia Ammonia is made odorless by the following reaction in OM or OME. _{2NH 3 + H 2 O + CO} 2 → (NH 4) 2 CO 3 2 (NH 4 OH) + H 2 O + CO 2 → (NH 4) 2 C
O ₃ + 2H ₂ O ammonia water also presents ammonium carbonate, and when the supply of oxygen is small, ammonium ions (NH ₄ ⁻ )
Is changed from nitrous acid to nitric acid by digestive bacteria and the like, and becomes odorless. 2NH ₃ + 2O ₂ → 2NHO + H ₂ O 2NHO ₂ + O ₂ → 2NHO ₃

Decomposition of hydrogen sulfide (H ₂ S) 2H ₂ S + O ₂ → 2NHO ₂ + H ₂ O Decomposition of methyl mercaptan (CH ₃ SH) 2CH ₃ SH + O ₂ → 2CH ₃ OH + S 2CH ₃ OH + 2 O ₂ → 2CO ₂ + H ₂ O Desalination It was found that it was possible to substantially remove sodium chloride in seawater. OME is applicable over the entire pH range and has the effect of bringing the pH back to neutral. OM
E is harmless.

It is considered that such an effect is obtained because the target dirt is decomposed and separated by the interaction of various enzymes such as carbon degrading enzymes and microorganisms present in the OME. In the present invention, the fine carbonaceous material is immersed in the OME to dissolve the carbonaceous material, and the OME active ingredient having such excellent characteristics is introduced into the carbonaceous material to obtain DCP. The fine carbonaceous material to be obtained means fine powder of graphite-based carbon and amorphous carbon, generally at a low temperature, preferably about 4
It is obtained by burning a carbon source at a low temperature of 00 ° C. or lower, and the source is not limited as long as the object of the present invention is achieved.

Examples of the carbon source of DCP include woody materials, cellulosic carbon such as crushed material (wood chips) and plants, plant-based carbon derived from plants containing carbohydrates, and protein-based carbon derived from animals and plants containing proteins. And petroleum-based carbon obtained from petroleum, and these carbons can be used alone or in combination.
It is particularly preferred to use carbon from these various sources which is discarded as so-called garbage. In mixing and stirring the finely divided carbonaceous material and the OME (or a diluent thereof), the ratio of the carbonaceous material and the OME diluent is not particularly limited as long as the object and effect of the present invention are not impaired. Absent. As for the mixing means, an aqueous microorganism solution may be introduced into the carbonaceous material, or the carbonaceous material may be introduced into the aqueous microorganism solution. Preferably, carbonaceous material is gradually introduced into the OME aqueous solution with stirring. In this way, when the finely divided carbonaceous material and the aqueous solution of the bacterial group are mixed and stirred, the carbonaceous material is gradually decomposed, and if the carbonaceous material is kept under stirring for about 1 to 4 weeks, a cake-like product is obtained. Or it becomes a sludge-like carrier,
The load of stirring is light. It should be noted that the water content of the cake-like or sludge-like carrier can be adjusted and used as it is, but it is also possible to add a desired amount of water after drying by, for example, sunlight or air drying.

The DCP thus obtained is diluted with water or an aqueous medium to prepare a slurry-like detergent. In this case, water may be used, and the effect of DCP is not impaired. It may be an aqueous medium containing the components. Preferably, the OME solution or a solution containing various microorganisms (for example, (a) an aerobic microorganism group, (b) an anaerobic microorganism group described in the international application by the present inventors,
(C) a microbial culture solution (referred to as OM: Dashaminon MK1 from Orient Green Co.) characterized by coexistence with at least one basidiomycete belonging to Pleurocetaceae and containing enzymes derived from these metabolites; And a slurry diluted with a cleaning agent containing the OME. The amount of water added at this time is appropriately selected according to the type of stain on the glass to be treated, and is used as the glass cleaning agent according to the present invention.

The glass to be subjected to the peeling / removing treatment in the present invention is glass to which various kinds of dirt are adhered, and particularly includes a cathode ray tube. The interior material applied to the inner surface of the cathode ray tube is a conductive coating film mainly composed of graphite (graphite) and water glass, and a coating film containing phosphors of three colors of red, green, and blue. Graphite, water glass, yttrium (Y), europium (Eu), zinc (Zn), silver (A
g) and other heavy metals. In particular, since the once commercialized cathode ray tube is treated at a high temperature of 400 to 450 ° C., the degree of fusion of these is strong.

The inner surface of such a cathode ray tube is connected to the DC
Upon contact with the cleaning OME diluent for glass according to the invention based on P slurry, the carbonaceous graphite becomes DC
P (or OME) begins to peel off due to the carbon-decomposing enzyme contained in it, and organic components such as binders are OM
It can be decomposed and separated by components such as microorganisms and enzymes in E. Furthermore, heavy metals in the interior material also begin to decompose in a similar manner. The interior material firmly adhered to the inner surface of the cathode ray tube in this way is removed from the inner surface layer of the cathode ray tube by the OME.
It shifts to the diluent layer and becomes in a state where it can be easily removed. The contact method at this time may be spraying the glass cleaning agent according to the present invention, or applying the glass cleaning agent according to the present invention to a wiping means such as cloth or sponge and applying the same to the glass surface.

When light wiping is performed with a wiping means such as a cloth or a sponge in this state, it is possible to easily peel off and remove dirt firmly adhered by interaction with the polishing action by DCP.

The cleaning agent for glass obtained by diluting DCP according to the present invention with an aqueous medium such as water or an OME diluent strongly adheres to the inner surface of a cathode ray tube, which has conventionally been difficult to peel and remove. It is possible to easily remove dirt on the glass including the attached interior material.

Claims (4)

[Claims] 1. The finely divided carbonaceous material is symbiotic with (a) an aerobic microorganism group, (b) an anaerobic microorganism group, (c) a basidiomycete belonging to at least one kind of Pleurocetaceae, and (d) a photosynthetic fungus. And immersed in a microbial culture solution characterized by containing enzymes derived from these microbial group metabolites and carbon-decomposing enzymes to dissolve the carbonaceous material, and in the microbial culture solution obtained by drying A cleaning agent for glass comprising a carrier containing an active ingredient and a slurry containing water or an aqueous medium. 2. The method of claim 2, wherein the finely divided carbonaceous medium is composed of (a) an aerobic microorganism group, (b) an anaerobic microorganism group, and (c)
A basidiomycete belonging to at least one species of Pleurotus, (d)
The cleaning agent for glass according to claim 1, wherein the cleaning agent for glass is a microbial culture solution characterized by being symbiotic with photosynthetic fungi and containing an enzyme derived from a metabolite of these microorganisms and a carbon-decomposing enzyme. 3. A method for cleaning glass, which removes and cleans substances adhered to a glass surface, wherein the cleaning agent according to claim 1 or 2 is applied to the surface of glass to be treated,
A method for cleaning glass, comprising wiping with wiping means. 4. The method according to claim 4, wherein the glass to be treated is a cathode ray tube.