JP3167108B2 - Powder cleaning composition for electric dust collector and cleaning method using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a powder detergent composition for an electrostatic precipitator and a method for cleaning an electric precipitator using the same. More specifically, the present invention relates to a non-corrosive, organic solvent-free powder cleaning composition excellent in cleaning performance applied to cleaning of a pre-filter of an electric precipitator, an RC precipitating electrode, an ionizer, and the like. The present invention relates to a method for efficiently cleaning the object to be cleaned by a cleaning machine such as an ultrasonic cleaning machine or a nozzle spray cleaning machine using the method.

[0002]

2. Description of the Related Art Pre-filters, RC precipitating electrodes, ionizers, etc. of electric precipitators include cigarette dust,
Various inorganic and organic stains such as oily smoke, mold, mite, dust, and dust adhere to the details, and especially the RC dust collecting electrodes are electrically stained, which causes the stains to be difficult to remove. Also, in this electrostatic precipitator, if it is not cleaned, the amount of dirt increases in about three months after the dirt starts to be deposited, and the denaturation of the dirt considerably progresses, the adhesion to the base material becomes strong, Becomes On the other hand, parts constituting the pre-filter, the RC dust collecting electrode, the ionizer, etc. of the electric dust collector include, for example, aluminum, tungsten, galvanized steel sheet, polypropylene,
Various materials such as vinyl chloride resin, unsaturated polyester, ABS resin, vinylidene chloride resin, polyamide and polyester are used. Therefore, cleaning agents for electric dust collectors include tobacco tar, oily smoke, mold, mites, dust,
Advanced cleaning of various inorganic and organic dirt such as dust,
Can be removed, does not corrode various materials used for parts of electric precipitators such as aluminum, tungsten, galvanized steel sheet, polypropylene, vinyl chloride resin, unsaturated polyester, ABS resin, vinylidene chloride resin, polyamide, polyester In addition, there is a demand for performance such that there is no difference in cleaning performance even when the water quality changes, and no irritating odor such as solvent odor is generated when used for cleaning.

[0003] By the way, fats and oils are transformed by heat, sunlight, trace amounts of metals, oxygen in the air, etc., and turned into resin, semi-solidified or carbonized, and adhered firmly to kitchen ventilation fans, ranges, walls and the like. In order to remove stains, various cleaning agents, for example, (1) a cleaning agent comprising an alkanolamine, a specific glycol ether and a surfactant (Japanese Patent Publication No. Sho 50)
No. -40126), a detergent comprising 3-methyl-3-methoxybutanol, a surfactant and an organic cleaning aid (JP-A-54-99106), a specific glycol ether, a specific amine compound and a surfactant (2) Alkali metal metasilicate, alkanolamine, organic anionic surfactant, monohydric aliphatic alcohol and / or specific glycol ether (Japanese Patent Laid-Open No. 2-289
No. 697), (3) a detergent comprising sodium or potassium hydroxide, 2-hydroxyethyl iminodiacetic acid salt and a copolymer of isoamylene and maleic anhydride (Japanese Patent Publication No. 2-27397); A detergent comprising sodium hydroxide, an alkali metal salt of nitrilotriacetic acid, and a copolymer of isoamylene and maleic anhydride (Japanese Patent Publication No. 3-60358) has been proposed. However, the cleaning agent of (1) has low odor and cleaning ability, and the cleaning agent of (2) has non-corrosiveness and cleaning ability of aluminum or stainless steel base material, and the cleaning agent of (3). The main focus of the present invention is on the chelating ability, the dispersing ability of dirt and the ability to prevent re-adhesion, but there is no mention of the use of the present invention for an electric dust collector. Further, these cleaning agents do not sufficiently satisfy the performance required as the cleaning agent for an electric dust collector.

Further, as other hard surface cleaning agents, for example, one or more selected from among (a) one or more surfactants, specific glycol ethers, organic amines and caustic alkalis A detergent comprising two or more kinds of alkali substances (JP-A-61-151300), a detergent comprising a specific glyceryl ether, a surfactant, a builder and water (JP-A-7-3289), a carbon number of 3
Ethylene oxides of aliphatic branched alcohols of
A detergent comprising a molar adduct, a nonionic surfactant and water (Japanese Patent Application Laid-Open No. Hei 7-90296), (b) one or more selected from specific alkyl glucosides, sugar fatty acid esters and amphoteric surfactants Cleans hard surfaces such as living rooms, kitchens, toilets, etc., consisting of one or more solvents selected from two or more surfactants, ethylene glycol, propylene glycol, butanediol, glycerin and hexylene glycol. Detergents suitable for sterilization (Japanese Patent Application Laid-Open No. 3-115497); (c) fats and oils in an oven comprising at least one selected from metal nitrates and metal carbonates, surfactants and thickeners ,
Cleaning agent for carbide stains (Japanese Patent Publication No. 60-54359), (d) Oil adhering to the surface of hard parts of various materials consisting of a surfactant, a specific alkali agent, and a specific polymer copolymer (E) household oil stains made of a specific aromatic polyether compound, various kinds of office supplies stains, floor stains in lobbies and hallways, etc. Rosin flux on printed circuit boards, cleaning agent for liquid stains
No. 57291).

[0005] However, the cleaning agent (a) has a high cleaning ability against a wide range of dirt on the hard surface,
The cleaning agent of (b) shows the non-breakability of the plastic and the glitter of the surface to be treated, and the cleaning agent of (c) shows the low irritation, the non-corrosiveness of the substrate and the cleaning ability. The cleaning agent mainly focuses on the non-corrosiveness and cleaning ability of the object to be washed, and the cleaning agent (e) mainly focuses on low erosion and cleaning ability of plastics and the like. There is no mention of the use. Also,
These cleaning agents, like the above-mentioned cleaning agents, do not sufficiently satisfy the performance required as a cleaning agent for an electrostatic precipitator. Conventionally, a neutral detergent of a liquid containing a surfactant as a main component, or a liquid alkaline detergent containing a sodium metasilicate, a phosphate and a surfactant as a main component has been used for cleaning an electrostatic precipitator. Have been. However, these conventional cleaning agents for electric precipitators also cannot sufficiently satisfy the performance required as a cleaning agent for electric precipitators. On the other hand, as a cleaning method of a pre-filter, an RC dust collecting electrode, an ionizer, etc. of an electrostatic precipitator, a conventional method of directly spraying a cleaning liquid on an object to be cleaned by using a trigger spray and rubbing the cleaning liquid, or a cleaning liquid contained in a dipping tank. A method has been adopted in which an object to be washed is soaked for a certain period of time and then rubbed. However, each of these methods is extremely troublesome and labor intensive, and furthermore, the R of the electrostatic precipitator is not sufficient.
It has the disadvantage that dirt attached to details such as the C dust collecting electrode and the ionizer cannot be sufficiently removed.

[0006]

Under such circumstances, the present invention sufficiently satisfies the above-mentioned performance required as a cleaning agent for an electrostatic precipitator.
A powder cleaning composition suitable for cleaning components such as a dust collecting electrode and an ionizer, and a cleaning method using the cleaning composition capable of completely and easily removing dirt adhering to the details of each component of the above-mentioned electrostatic precipitator. The purpose is to provide.

[0007]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to achieve the above object, and as a result, have found that a specific proportion of a silicate, an organic acid salt, a water-soluble aminopolycarboxylate, and an organic electrolyte have a high content. A powder composition containing an active ingredient comprising a molecular polymer, a surfactant, and an optional silicone-based defoamer or detergent enzyme can be adapted to the purpose as an electrostatic precipitator detergent composition; and Dissolve this thing in water, for example, immersion cleaning of the object to be washed using an ultrasonic cleaner, or spraying the object to be washed in a batch or continuous manner using a nozzle spray type washing machine It has been found that by using a washing machine, it is possible to completely and easily remove dirt adhering to details of components such as a pre-filter of an electric dust collector, an RC dust collecting electrode, and an ionizer. The present invention has been completed based on such findings.

That is, the present invention relates to (1) (A) 30 to 60% by weight of a silicate, (B) 20 to 40% by weight of an organic acid salt, (C) 5 to 15% by weight of a water-soluble aminopolycarboxylate, (D) Organic electrolyte polymer
1.0 to 10% by weight and (E) 5 to 15% by weight of surfactant
(2) (A) 30 to 60% by weight of silicate, (B) 20 to 40% by weight of organic acid salt, (C) water solubility Aminopolycarboxylate 5 to 15% by weight, (D) organic electrolyte polymer
1.0 to 10% by weight and (E) 5 to 15% by weight of surfactant
(F) a powder detergent composition for an electrostatic precipitator, comprising, as an active ingredient, (F) a silicone-based antifoaming agent in an amount of 0.1 to 5 parts by weight with respect to 100 parts by weight of a basic composition comprising: 30 to 60% by weight of silicate, (B) 20 to 40% by weight of organic acid salt, (C) 5 to 15% by weight of water-soluble aminopolycarboxylate, (D) Organic electrolyte polymer
1.0 to 10% by weight and (E) 5 to 15% by weight of surfactant
(F) 0.1 to 5 parts by weight of a silicone-based antifoaming agent, or (G) 0.1 to 5 parts by weight of a detergent enzyme based on 100 parts by weight of the basic composition comprising And (4) the powder cleaning compositions of (1), (2) and (3) are dissolved in water, and An electrostatic precipitator, wherein the object to be cleaned is immersed and cleaned, or the object to be cleaned is immersed and cleaned by an ultrasonic cleaner, or is jetted to the object to be cleaned in a batch or continuous manner by a nozzle jet type washing machine. Cleaning method.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the powder detergent composition for an electrostatic precipitator of the present invention, the silicate used as the component (A) in the basic composition includes, for example, sodium metasilicate,
Examples thereof include sodium orthosilicate, sodium disilicate, and sodium sesquisilicate. Of these, anhydrous sodium metasilicate is particularly preferably used from the viewpoints of cleaning performance and corrosion suppression of the object to be cleaned. The silicate is preferably composed of particles having a particle diameter of 250 to 1400 μm from the viewpoints of suppression of foaming during washing and appearance and properties of the powder composition.
Those having a diameter of 720 μm and a bulk density of 1.2 to 1.5 g / cm ³ are preferred. When the silicate is in the range of the particle size distribution described above, the effect thereof can be stabilized over time when an antifoaming agent described below is added. The silicate of the component (A) may be used alone or in combination of two or more. The content is selected within the range of 30 to 60% by weight based on the total weight of the basic composition. If this amount is less than 30% by weight, sufficient cleaning performance and corrosion inhibiting effect are difficult to obtain, and it is economically disadvantageous. If it exceeds 60% by weight, the amount of other components is restricted, and the desired performance is not achieved. Cannot be obtained. From the viewpoints of performance and economy, a particularly preferred content of the silicate is in the range of 40 to 50% by weight based on the total weight of the basic composition.

Examples of the organic acid salt used as the component (B) of the basic composition include mono- or polycarboxylic acids such as formic acid, acetic acid, oxalic acid, malonic acid, succinic acid and glutaric acid, citric acid, malic acid and tartaric acid. And salts of hydroxycarboxylic acids such as gluconic acid. Here, examples of the salt include a sodium salt, a potassium salt, an ammonium salt, an alkyl-substituted or alkanol-substituted ammonium salt, and the like. As these organic acid salts, sodium hydroxycarboxylate is particularly preferred from the viewpoints of performance such as washing performance and sequestering performance and economic efficiency. The organic acid salt of the component (B) may be used alone, or two or more kinds may be used in combination. The content is selected in the range of 20 to 40% by weight based on the total weight of the basic composition. If the amount is less than 20% by weight, the desired performance is not sufficiently exhibited, and if it exceeds 40% by weight, the storage stability of the detergent composition tends to decrease. In terms of performance and storage stability of the detergent composition,
A particularly preferred content of this organic acid salt is in the range of 25 to 35%, based on the total weight of the base composition.

The water-soluble aminopolycarboxylate as the component (C) in the basic composition is not particularly limited, and may be any of those conventionally used as chelating agents in detergents, such as ethylenediaminetetraacetic acid, nitrilotriacetic acid, and the like.
Salts such as sodium salt and potassium salt such as N- (2-hydroxyethyl) nitrilodiacetate can be mentioned. Among them, ethylenediaminetetraacetic acid is preferred from the viewpoints of effects on sequestering performance and economy. Salts and / or nitrilotriacetates are preferred. Since this water-soluble aminopolycarboxylate chelates the hardness component in the washing water, it has an action of causing no difference in washing performance even when the water quality changes. The water-soluble aminopolycarboxylate may be used alone or in combination of two or more. The content of the water-soluble aminopolycarboxylate of the component (C) is 5% based on the total weight of the basic composition.
-15% by weight. If the amount is less than 5% by weight, the chelating effect is not sufficiently exhibited, and 15% by weight.
If it exceeds, the effect is not so much improved for the amount, and it is rather economically disadvantageous. The particularly preferable content of the water-soluble aminopolycarboxylate is in the range of 7 to 12% by weight based on the total weight of the basic composition from the viewpoint of the chelating effect and economy.

The organic electrolyte polymer used as the component (D) in the basic composition is not particularly limited.
Various compounds such as polyacrylic acid, polyaconitic acid, polyitaconic acid, polycitraconic acid, polyfumaric acid, polymaleic acid, polymethaconic acid, polyα-hydroxyacrylic acid, polyvinylphosphonic acid, sulfonated polymaleic acid, maleic anhydride and Poly β-ketocarboxylic acid derived from carbon oxide, itaconic acid-ethylene copolymer, itaconic acid-aconitic acid copolymer, itaconic acid-maleic acid copolymer, itaconic acid-acrylic acid copolymer, itaconic acid- Fumaric acid copolymers and salts thereof such as sodium salts, potassium salts, ammonium salts, alkyl-substituted or alkanol-substituted ammonium salts, and furthermore, maleic anhydride-diisobutylene copolymer, maleic anhydride-styrene copolymer, anhydrous Maleic acid-methyl vinyl ether copolymer Copolymer, maleic anhydride-ethylene copolymer, maleic anhydride-ethylene crosslink copolymer, maleic anhydride-vinyl acetate copolymer, maleic anhydride-acrylonitrile copolymer, maleic anhydride-
Acrylic acid ester copolymer, maleic anhydride-butadiene copolymer, maleic anhydride-isoprene copolymer,
Examples include vinylpyrrolidone-vinyl acetate copolymer, malonic acid-methylene copolymer, ethylene glycol-ethylene terephthalate copolymer, and the like. Among them, homopolymers of unsaturated carboxylic acids selected from acrylic acid, maleic acid, methacrylic acid, fumaric acid and itaconic acid, copolymers of two or more unsaturated carboxylic acids and salts thereof Is preferable, especially a polymer of acrylic acid and a salt thereof,
Copolymers of acrylic acid and maleic acid and salts thereof are preferred from the viewpoint of washing performance and the like. Here, examples of the salt include a sodium salt, a potassium salt, an ammonium salt, an alkyl-substituted or alkanol-substituted ammonium salt, and a sodium salt is preferable.

The molecular weight of the organic electrolyte polymer is not particularly limited, but from the viewpoint of the effect of preventing re-contamination by emulsification and dispersion of dirt, for example, a polymer of acrylic acid has a number average molecular weight of 4,000 to 30,000. In the range of 000, the copolymer of acrylic acid and maleic acid has a number average molecular weight of 3
Those having a range of from 10,000 to 100,000 are preferred. In addition, in the case of a polymer of acrylic acid, Acusol 445N
D, Acusol 505ND (Rohm and Ha
as), Julimar AC-10NP, Julimar A
C-103AP (Nippon Pure Chemical Co., Ltd.), Sokalan
PA 25CL, Sokalan PA30CL, S
okalan PA40 (BASF) is a copolymer of acrylic acid and maleic acid.
(Rohm and Haas), Sokalan C
P-5, Sokalan CP-7, Sokalan
CP-45 (BASF) and the like can be easily obtained as commercial products. The organic electrolyte polymer of the component (D) may be used alone or in combination of two or more. The content is based on the total weight of the basic composition,
It is selected in the range of 1.0 to 10% by weight. If the amount is less than 1.0% by weight, the desired performance is not sufficiently exhibited, and if it exceeds 10% by weight, the effect of improving the performance is not so much recognized for the amount, and it is economically disadvantageous. . From the viewpoints of performance and economy, a particularly preferred content of the organic electrolyte polymer is in the range of 3 to 8% by weight based on the total weight of the basic composition.

The surfactant of the component (E) in the basic composition is not particularly limited, and various surfactants can be used. However, non-ionic surfactants are preferred from the viewpoints of performance such as foam suppression performance, cleaning performance, and soil emulsification / dispersion performance. Surfactants are advantageous. Examples of the nonionic surfactant include polyoxyethylene polyoxypropylene polymers, ethers such as polyoxyethylene polyoxypropylene alkyl or alkenyl ether, and polyoxyethylene alkyl phenyl ether; polyoxyethylene sorbitan fatty acid esters; Ether esters such as oxyethylene sorbite fatty acid ester and polyoxyethylene castor oil, esters such as polyethylene glycol fatty acid ester, glycerin fatty acid ester, sorbitan fatty acid ester and sucrose fatty acid ester, coconut oil fatty acid diethanolamide, lauric acid diethanolamide, laurin Acid myristic acid diethanolamide, myristic acid diethanolamide, oleic acid diethanolamide,
Higher fatty acid alkanolamides such as palm kernel oil fatty acid diethanolamide, alkylamine oxides such as lauryl dimethylamine oxide, cetyl dimethylamine oxide, and palmityl dimethylamine oxide, and phosphate esters are also included. Among them, non-ionic surfactants having low foaming are preferable, and polyoxyethylene alkyl phenyl ether and aliphatic alcohol alkoxylate are particularly preferable. Examples of the polyoxyethylene alkyl phenyl ether include octyl phenol, nonyl phenol, dodecyl phenol and the like to which about 1 to 20 mol of ethylene oxide is added, and examples of the aliphatic alcohol alkoxylate include Plurafac LF-120,
Plurafac LF-131, Plurafac
LF-132, Plurafac LF-224, Pl
urafac LF-400, Plurafaf L
F-431, Plurafac LF-700 and the like.

The surfactant of component (E) may be used alone or in combination of two or more. In particular,
In the present invention, two or more kinds of polyoxyethylene alkylphenyl ethers or a combination of polyoxyethylene alkylphenyl ether and an aliphatic alcohol alkoxylate are also preferably used. Also,
The content of the surfactant (E) is selected in the range of 5 to 15% by weight based on the total weight of the basic composition. If the amount is less than 5% by weight, good cleaning performance cannot be obtained.
If the amount exceeds 10% by weight, the effect of improving the cleaning performance is not so much recognized for the amount, and it is rather economically disadvantageous. From the viewpoints of washing performance and economy, a particularly preferred content of the surfactant is in the range of 7 to 13% by weight based on the total weight of the basic composition.

The powder detergent composition for an electrostatic precipitator of the present invention contains foams for the purpose of suppressing foaming during washing and stabilizing foams.
As the component (F), a silicone-based antifoaming agent can be blended. There is no particular limitation on the silicone antifoaming agent,
Conventionally known antifoaming agents can be used, but a self-emulsifying silicone antifoaming agent called a compound type is particularly preferable. For example, FS antifoam 544, FS antifoam 001, FS antifoam 0126A, FS Antifoam 81 (manufactured by Dow Corning Asia Co., Ltd.), silicone KS-496A, silicone KS-502, silicone KS-506, silicone KS-530, silicone KS-531, silicone KS-536, silicone KS-537 , Silicone KS-538 (all manufactured by Shin-Etsu Chemical Co., Ltd.), Y
SA6406, YSA780 (Toshiba Silicone Corporation)
Is easily available as a commercial product. These silicone-based antifoaming agents may be used alone or in combination of two or more. In addition, emulsion-type, oil-type, and powder-type silicone-based antifoaming agents are also used. The amount of the silicone-based antifoaming agent (F) is selected in the range of 0.5 to 5 parts by weight based on 100 parts by weight of the basic composition. If this amount is less than 0.5 parts by weight, the effect of adding the silicone-based antifoaming agent is not sufficiently exhibited,
On the other hand, if the amount exceeds 5 parts by weight, the effect is not so much improved relative to the amount, but rather the washing performance is lowered, and it is economically disadvantageous. From the standpoints of foaming suppression effect and economic efficiency, the preferred compounding amount of this silicone-based antifoaming agent is in the range of 1.0 to 3.0 parts by weight based on 100 parts by weight of the basic composition.

[0017] The detergent enzyme of the component (G) is not particularly limited, and includes those conventionally known for detergents, such as amylase, protease, cellulase and lipase. Here, examples of the amylase include termamyl (manufactured by Novo Nordisk), duramil (manufactured by Novo Nordisk), and maxamil (manufactured by Genencor).
Examples of proteases include, for example, Alcalase (Novo Nordisk), Savinase (Novo Nordisk), Esperase (Novo Nordisk),
Durazyme (manufactured by Novo Nordisk), Maxacal (manufactured by Genencor) and the like are commercially available as cellulases, such as cellzyme (manufactured by Novo Nordisk), and lipase are commercially available such as lipolase (manufactured by Novo Nordisk). It is easily available as a product. One of these enzymes may be used, or two or more of them may be used in combination.

By blending the enzyme of the above-mentioned component (G), especially organic stains can be more effectively removed. The amount of the enzyme is 0.5 to 100 parts by weight of the basic composition.
It is selected in the range of 5.0 parts by weight. If this amount is less than 0.5 parts by weight, the effect of blending the enzyme will not be sufficiently exerted, and the amount of the enzyme will not exceed 5.
If the amount exceeds 0 parts by weight, the effect is not so much improved for the amount, and it is rather economically disadvantageous. From the viewpoints of the effect of blending the enzyme and the economical efficiency, a particularly preferred blending amount of the enzyme is in the range of 1.0 to 3.0 parts by weight based on 100 parts by weight of the basic composition. The powder cleaning composition for an electrostatic precipitator of the present invention comprises the above components (A), (B), (C),
Any component may be used as long as it contains a basic composition composed of the components (D) and (E) as an active ingredient. If desired, the basic composition may be further added with (F) silicone for the purpose of improving the defoaming performance. Those containing an antifoaming agent as an active ingredient can also be used. Further, for the purpose of further improving the cleaning performance, the basic composition or a composition obtained by blending the above-mentioned (F) silicone antifoaming agent with the basic composition, and further blending (G) a detergent enzyme as an active ingredient. What it contains can also be used.

The powder detergent composition for an electrostatic precipitator of the present invention may further contain, if necessary, an alkali such as sodium hydroxide or a washing builder other than the above components. Such a washing builder is not particularly limited, and includes those conventionally used as washing builder, for example, various carbonates, acidic carbonates, sulfates, phosphates and the like. Here, as the carbonate, for example, sodium carbonate, potassium carbonate, sodium sesquicarbonate and the like, as the acidic carbonate, for example, sodium acid carbonate and the like, as the sulfate, for example, sodium sulfate, and as the phosphate, for example, For example, sodium tripolyphosphate, sodium orthophosphate and the like can be mentioned. These may be used alone or in combination of two or more.

The powder detergent composition for an electrostatic precipitator of the present invention may contain, if desired, known conventional components such as fragrances, coloring agents, corrosion inhibitors, solvents and the like, as long as the object of the present invention is not impaired. They can be appropriately blended. The cleaning composition for an electrostatic precipitator of the present invention preferably contains no organic solvent and is preferably in a powder form. As described above, since it does not contain an organic solvent and is in a powder form, the cleaning composition for an electrostatic precipitator of the present invention does not generate a solvent odor at the time of use, and a sufficient effect can be obtained with a smaller amount than a liquid product. Has the advantage of being In the case of the conventional liquid form, it is usually filled in a plastic container. However, in recent years, the plastic container has problems such as difficulty in decomposing the plastic under natural environment and reduction in the amount of disposal. ing. Furthermore, leakage of contents during transportation or use also poses a problem. For this reason,
Although measures such as increasing the thickness of the plastic container are taken, in this case, it is not preferable because problems such as an increase in the disposal amount and a burden on transportation costs are caused. From such a point, in the case of the powder form as in the present invention, it is possible to use a plastic bag, a paper container, or the like, so that the problem of disposal treatment is reduced, and the small packaging is also facilitated. Another advantage is that there is almost no leakage.

Next, the cleaning method of the present invention using the powder cleaning composition for an electrostatic precipitator will be described. First,
The powder cleaning composition of the present invention is dissolved in water to prepare a cleaning liquid. The concentration at this time is not particularly limited, but generally, the active ingredient is dissolved and used so as to have a concentration of about 0.1 to 2% by weight. Next, the object to be washed, such as a pre-filter of an electric dust collector, an RC dust collecting electrode, and an ionizer, is immersed in the washing solution to perform washing, or the washing solution is batch-type or continuous-type by a nozzle jet type washing machine. Cleaning is performed by, for example, spraying the object to be washed. In particular, when washing is performed by immersion, a method of washing an object to be washed using an ultrasonic cleaner is also preferably exemplified. With such a cleaning method, the pre-filter of the electrostatic precipitator,
Dirt adhering to details such as an RC dust collecting electrode and an ionizer can be completely and easily removed. The powder detergent composition of the present invention is used for an electrostatic precipitator, but can also be applied to the cleaning of oils and grime adhered to hard surfaces such as metals, glasses, ceramics, and plastics.

[0022]

Next, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples. The performance of the detergent composition was evaluated according to the following procedure. (1) Detergency (a) Immersion cleaning A part of the dust collecting electrode plate (made of aluminum) of the RC collecting electrode actually used in pachinko parlors and restaurants, where the dirt is attached to the same extent is 60 mm. It was cut into a size of × 120 mm and provided as an object to be washed. On the other hand, the detergent composition was dissolved in each of tap water, distilled water and artificial hard water (200 ppm as CaCO ₃ ) so that the active ingredient concentration was 0.5% by weight, and a cleaning solution at 60 ° C. was prepared. The artificial hard water was adjusted by calcium chloride dihydrate (JISK 81).
22; Calcium chloride (dihydrate) (reagent)) is weighed to a predetermined concentration and dissolved in pure water. This solution is JIS K0101 (Industrial water test method).
The hardness is measured according to 1. Next, the cleaning solution at 60 ° C.
The object to be washed was immersed in 1,000 milliliters for 10 minutes for washing, then rinsed sufficiently with tap water, and then visually evaluated for detergency according to the following criteria.

(B) Ultrasonic cleaning The cleaning composition was dissolved in tap water so that the active ingredient concentration was 0.5% by weight to prepare a cleaning solution at 60 ° C. Next, the same object to be cleaned as in (a) is immersed in 1,000 ml of the above-mentioned 60 ° C. cleaning solution, and is washed for 10 minutes by an ultrasonic cleaner [manufactured by Tokyo Ultrasonics Co., Ltd., high-frequency output 600 W]. After rinsing with running water, the detergency was visually evaluated according to the following criteria. (C) Nozzle spray cleaning Next, a dishwasher [Matsushita Electric Industrial Co., Ltd., NP
-9103M, a step of injecting a cleaning liquid from a rotary nozzle, and cleaning, rinsing, and drying the object to be cleaned disposed on the track. And 32.5 g of the powder detergent composition for an electrostatic precipitator of the present invention, using a washing temperature of 60 ° C. and a washing time of
Under the conditions of 30 minutes, rinsing time: 37 minutes, drying time: 15 minutes, amount of washing liquid: 6.5 liters, the washing of the object to be washed in (a) was carried out without cutting, and visual inspection was performed. The detergency was evaluated according to the following criteria. Criteria ◎: Stain is completely removed O: Stain is reduced by 80% or more △: Stain is reduced by about 20 to 80% ×: Stain is hardly removed

(2) Corrosion Aluminum plate (60.0 × 26.5 × 0.15 mm), galvanized steel plate (39.0 × 27.0 × 0.6 mm), tungsten wire (diameter 0.1 mm, length 1000 mm), an ABS resin plate (60.0 × 18.0 × 2.5 mm) and an unsaturated polyester piece (2.5 × 2.5 × 2.5 mm), respectively, dissolve the detergent composition in tap water A corrosion test was carried out by immersing in a 60 ° C. washing solution having an active ingredient concentration of 0.5% by weight for 20 hours.
Corrosion was evaluated according to the following criteria based on the weight change of each material after immersion or visual observation of the surface state. Judgment criteria ；: Weight change: less than 0.0050 g, or surface condition:
No change △: Weight change: 0.0050 g or more and less than 0.0100 g, or surface condition: discolored ×: Weight change: 0.0100 g or more, or surface condition:
Corrosion In addition, change in weight includes both increase and decrease.

(3) Low Foam Test The detergent composition was placed in a closed plastic container, and the temperature was 35 ° C.
A constant temperature and humidity chamber (Yamato Chemical Co., Ltd.)
IG-46M) and a dishwasher similar to the one used in (1) (c) above, without the object to be cleaned, in the same manner as in (c). After operation, the state of foaming 10 minutes after the start of washing was visually observed, and the low foaming property was evaluated according to the following criteria. A: Almost no bubbles were observed, and there was no hindrance to cleaning. 〇; Although bubbles are slightly observed, there is no problem in cleaning. Δ: Foaming that does not hinder cleaning is observed. X: Foaming which hinders cleaning is observed.

Examples 1 to 18 and Comparative Examples 1 to 6 Powder cleaning compositions containing the basic compositions shown in Table 1 as active ingredients were prepared and their performance was evaluated. Second result
It is shown in the table.

[0027]

[Table 1]

[0028]

[Table 2]

[0029]

[Table 3]

[0030]

[Table 4]

(Note) 1) Anhydrous sodium metasilicate A: particle size 250 to 1,40
0 μm, average particle size 660 μm, bulk density 1.39 2) Anhydrous sodium metasilicate B: particle size 500 to 1,40
0 μm, average particle diameter 800 μm, bulk density 1.08 3) Anhydrous sodium metasilicate C: particle diameter 45-600 μm
m, average particle size 200 μm, bulk density 1.39 4) EDTA-4Na: sodium ethylenediaminetetraacetate 5) NTA-3Na: sodium nitrilotriacetate 6) sodium polyacrylate A: average molecular weight 6,0
7) Polyacrylic acid sodium salt B: average molecular weight 15,
000 8) Acrylic acid / maleic acid copolymer sodium salt A:
Average molecular weight: 50,000 9) Acrylic acid / maleic acid copolymer sodium salt B:
Average molecular weight 70,000 10) Surfactant A: polyoxyethylene octyl phenyl ether, average number of moles of added ethylene oxide 8
(Adecitol OPL-680; manufactured by Asahi Denka Kogyo Co., Ltd.) 11) Surfactant B: polyoxyethylene nonylphenyl ether, average number of moles of ethylene oxide added 10
(Nonipol 100; manufactured by Sanyo Chemical Industries, Ltd.) 12) Surfactant C: aliphatic alcohol alkoxylate (Plurafac LF-132; manufactured by BASF) 13) Silicone-based defoamer A: manufactured by Dow Corning Asia 14) Silicone-based antifoaming agent B: Silicone KS-536 manufactured by Shin-Etsu Chemical Co., Ltd. 15) Lipase: manufactured by Novo Nordisk, Lipolase 3
0T

[0032]

[Table 5]

[0033]

[Table 6]

[0034]

[Table 7]

[0035]

[Table 8] (Note) 1) Artificial hard water: 200 ppm as CaCO ₃

[0036]

The powder detergent composition for an electrostatic precipitator of the present invention has excellent detergency against inorganic and organic dirt, does not corrode materials such as metals and plastics, and retains detergency against changes in water quality. It has characteristics such as low foaming and no solvent odor during cleaning, and is suitably used for cleaning components such as a prefilter, an RC dust collecting electrode, and an ionizer of an electric dust collector. Further, the powder detergent composition can also be used for cleaning oil and fat stains adhering to hard surfaces of metals, glasses, ceramics, plastics and the like. Further, according to the immersion cleaning method using the sonic cleaner of the present invention, it is possible to completely and easily remove dirt attached to details of components such as a prefilter, an RC dust collecting electrode, and an ionizer of an electric dust collector.

Continuation of the front page (51) Int.Cl. ⁷ identification code FI C11D 3:33 3:37 1:72 1:68) (56) References JP-A-10-140196 (JP, A) JP-A-7- 70778 (JP, A) JP-A-4-202789 (JP, A) JP-A-2-99599 (JP, A) JP-A-9-176690 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) C11D 10/02 C11D 17/06 C11D 3/00 C11D 1/00

Claims (12)

(57) [Claims] (A) 30-60% by weight of a silicate, (B)
20 to 40% by weight of an organic acid salt, (C) 5 to 15% by weight of a water-soluble aminopolycarboxylate, (D) 1.0 to 10% by weight of an organic electrolyte polymer, and (E) surfactant 5-1.
A powder cleaning composition for an electrostatic precipitator, comprising a basic composition comprising 5% by weight as an active ingredient. 2. The electric power according to claim 1, which comprises, as an active ingredient, (F) a silicone-based antifoaming agent in an amount of 0.1 to 5 parts by weight with respect to 100 parts by weight of the basic composition. Powder cleaning composition for dust collectors. 3. The powder detergent composition for an electrostatic precipitator according to claim 1, wherein the silicate of the component (A) is anhydrous sodium metasilicate. 4. The silicate of the component (A) has a particle size of 250 to 1
It has a bulk density of 1.2 to 1.5.
electrostatic precipitator powder detergent composition according to any one of claims 1 to 3 is of g / cm ^3. 5. The powder cleaning composition for an electrostatic precipitator according to claim 1, wherein the water-soluble aminopolycarboxylate as the component (C) is ethylenediaminetetraacetate and / or nitrilotriacetate. . 6. The organic electrolyte polymer of component (D) is at least one selected from a polyacrylic acid polymer and a salt thereof, a copolymer of acrylic acid and maleic acid and a salt thereof. A powder cleaning composition for an electric dust collector according to any one of claims 1 to 5. 7. The powder detergent composition for an electrostatic precipitator according to claim 1, wherein the surfactant (E) is a nonionic surfactant. 8. The surfactant of component (E) is (A) at least one kind of polyoxyethylene alkyl phenyl ether, or (B) polyoxyethylene alkyl phenyl ether and / or an aliphatic alcohol alkoxylate. 7. The powder detergent composition for an electric dust collector according to any one of 1 to 6. 9. The method according to any one of claims 1 to 8, further comprising (G) 0.1 to 5 parts by weight of a detergent enzyme as an active ingredient based on 100 parts by weight of the basic composition. A powder detergent composition for an electric dust collector. 10. A method for cleaning an electrostatic precipitator, comprising: dissolving the powder cleaning composition according to claim 1 in water, and immersing the object to be cleaned in the water. 11. An electrostatic precipitator, comprising dissolving the powder detergent composition according to claim 1 in water, and immersing and washing the object to be cleaned by an ultrasonic cleaner using the powder detergent composition. Cleaning method. 12. The powder detergent composition according to any one of claims 1 to 9 is dissolved in water, and the solution is sprayed onto a workpiece in a batch or continuous manner by a nozzle spray type washer using the same. A method for cleaning an electrostatic precipitator, comprising: