JP2003136054A - Part of water purifier, method for producing the same and the water purifier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water purifier of which the inside is not stuck by fur and in which fungi or the like are not developed and grown, and to provide a method for producing the parts of the water purifier. SOLUTION: The part of the water purifier has a film formed on the surface by coating it with a liquid composition containing (a) 4-40 parts by weight in terms of solid content of inorganic colloidal material and/or inorganic fine particles of 3 μm or less of the average particle size, which are supported by silver of 2-12% by weight to the solid content, (b) 4-28 parts by weight in terms of solid content of at least a kind selected from a group consisting of a synthetic resin and a metal alkoxide as a binder, and (c) water and /or a hydrophilic organic solvent [provided that (a)+(b)+(c)=100 parts by weight], and the method for producing the same, and the water purifier having the parts for the water purifier as the structural parts are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water purifier component, a method for manufacturing the same, and a water purifier. More specifically, by coating a film containing ultrafine particles on which silver is supported, parts for water purifiers that have the function of preventing the attachment and accumulation of scales, maintaining the function of water purifiers, and suppressing the generation and propagation of fungi , Its manufacturing method, and a water purifier using the same.

[0002]

2. Description of the Related Art Conventionally, water purifiers have used synthetic resins, stainless steel, etc. as constituent materials, hollow fibers, activated carbon, natural minerals etc. as filtering materials, magnets, natural or artificial minerals etc. as modifiers. Are manufactured. Such a water purifier is intended to remove chlorine and chlorine odors, chemical substances such as trihalomethane and trichlorethylene, metals such as red rust and lead, and bacteria in tap water and well water. In addition, there are some that make active water and functional water by electrolysis, magnetism, electrons, ceramics, and the like.
However, when the water purifier is used for a long period of time, there is a problem that water stains adhere to the inner surface of the water purifier, water channels, internal components such as partitions, etc., and gradually accumulate to impair the water purification function of the main body. In addition, if the water purifier is not used, fungi will be generated and propagated. In order to deal with these problems, there are some cases in which a carrier in which silver is ion-exchanged is mixed with a synthetic resin, and a case in which such a carrier is adsorbed on activated carbon are used. Has not arrived.

[0003]

DISCLOSURE OF THE INVENTION The present invention is provided on the surface of various internal components constituting a water purifier, the inner surface of the water purifier body, and the like.
An object of the present invention is to provide a water purifier in which the formation of a silver-loaded ultrafine particle film and the use of such a component have greatly improved adhesion of scale and antibacterial properties.

[0004]

According to the present invention, (a) an inorganic colloidal substance carrying 2 to 12% by weight of solid content and / or an average of 2 to 12% by weight of solid content of silver is used. Inorganic fine particles with a particle size of 3 μm or less are converted to solid content by 4
To 40 parts by weight, 4 to 28 parts by weight in terms of solid content of at least one selected from the group consisting of (b) synthetic resin and metal alkoxide as a binder, and (c) water and / or hydrophilic organic solvent [ However, (a) + (b) +
(C) = 100 parts by weight] is applied to a water purifier component having a film formed by applying a liquid composition on the surface. Further, the present invention relates to (a) an inorganic colloidal substance supporting 2 to 12% by weight of solid content and / or an inorganic colloidal substance supporting 2 to 12% by weight of solid content and having an average particle size of 3 μm or less. 4-40 in terms of solid content
4 to 28 parts by weight in terms of solid content of at least one selected from the group consisting of (b) synthetic resin and metal alkoxide as a binder, and (c) water and / or hydrophilic organic solvent [however, (a) + (b) + (c) = 1
00 parts by weight] is applied to a water purifier component and cured by heating at room temperature or low temperature to form a film on the surface thereof. Further, the present invention relates to a water purifier having the above water purifier component as a structural component.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, a water purifier component is a component of a water purifier and is used in a portion that comes into contact with water. For example, the water purifier main body container whose inner surface comes into contact with water, and the internal components include partition plates such as filter media and reformers, outlet nozzles, and water channels.
The present invention is characterized in that a coating film containing fine particles of an inorganic substance carrying silver is formed on a portion of such a part that comes into contact with water. The coating film comprises a liquid composition containing silver-supported inorganic colloidal substances and / or inorganic fine particles, a binder, water and / or alcohol, and the inner surface of the water purifier main body or the internal components of the water purifier, for example, an outlet nozzle. It is applied to the inner surface of and cured by heating at room temperature or low temperature.

In the present invention, the inorganic colloidal substance is
The fine particles are dispersed in a dispersion medium, and various known colloidal inorganic compounds can be used. The average particle size of the fine particles is preferably 0.005 to 0.1 μm. The dispersion medium is mainly water, but may be alcohols or a water / alcohol mixed solvent, and the solid content concentration of the inorganic substance is 1
It is generally about 0 to 60% by weight. Specific examples of the inorganic colloidal substance include colloidal silica, colloidal alumina, colloidal titanium oxide, colloidal zirconium silicate and the like.

On the other hand, the inorganic fine particles have an average particle size of 3 μm or less, preferably about 0.01 to 3 μm. Further, it is preferably water-insoluble and particulate or fibrous, and at least one selected from the group consisting of metal oxides and metal hydroxides can be mentioned. The average particle size is
If it is less than 0.01 μm, it is not preferable because silver is buried and it is difficult to exert its function and the composition thickens. On the other hand, when it exceeds 3 μm, the adhesion is lowered and the surface area becomes too small, which is not preferable. Specific examples of the inorganic fine particles include calcium carbonate, magnesium carbonate, zinc carbonate, silica, alumina, titania (titanium oxide), zinc oxide, aluminum silicate, calcium silicate, magnesium kenate, aluminum hydroxide, magnesium hydroxide, Examples thereof include fine particles such as potassium titanate or fibrous substances.

In the present invention, these inorganic colloidal substances and / or inorganic fine particles are used by adsorbing, fixing and supporting silver. By supporting silver on these substances, the coating film obtained from the liquid composition containing them can be made antibacterial and the adhesion of scale can be prevented. The coating film containing fine particles supporting silver has a large surface area and an increased contact area with water, so that silver is likely to be uniformly ionized in a small amount (the amount of silver eluted is 0.0002 to 1 liter of water).
0.001 mg), it is possible to always maintain a stable antibacterial activity, and it is possible to prevent the mineral components (calcium, magnesium, etc.) dissolved in water from adhering to the water purifier constituent material.

The amount of silver supported is 100% by weight (in terms of solid content) of the inorganic colloidal substance and / or the inorganic fine particles,
It is 2 to 12% by weight, preferably 5 to 10% by weight. Two
If it is less than 10% by weight, the antibacterial activity and purification ability are insufficient, or the solid content increases too much, which is not preferable. On the other hand, if it exceeds 12% by weight, silver is eluted or discoloration occurs due to excess silver. Is not preferable. The content of the inorganic colloidal substance and / or the inorganic fine particles supporting silver (a) in the liquid composition is 4 to 40 parts by weight, preferably 6 to 30 parts by weight in terms of solid content. . If the amount is less than 4 parts by weight, the antibacterial activity and the cleaning power are insufficient, while if it exceeds 40 parts by weight, the coating film becomes brittle and the viscosity of the composition increases, which is not preferable.

The inorganic colloidal substance supporting silver can be obtained, for example, as follows. That is, 50 g of silver nitrate is dissolved in 500 g of water, 100 g of ammonia water (3% by weight concentration) is added thereto, and the solution in which the first silver oxide precipitate is about to dissolve is filtered, and 400 ml of pure water is added to this. In addition, make a total of 500 ml of silver solution.
When 200 ml of this silver solution is put into 800 g of colloidal silica (silica content: about 30% by weight) and mixed, silver is adsorbed and fixed on the silica to be stabilized, and colloidal silica carrying silver can be obtained. Next, the inorganic fine particles carrying silver can be obtained, for example, as follows. That is, 10 g of silver nitrate was dissolved in 100 g of water, 100 g of ultrafine particle titanium was added thereto, and the mixture was stirred.
Dry under atmospheric pressure at 0 ° C. for 1.5 hours. To this, 400 g of water is added and mixed, and then filtered to obtain titanium fine particles carrying water-containing silver.

The (b) binder used in the present invention is at least one selected from the group consisting of synthetic resins and metal alkoxides. As a synthetic resin,
For example, an epoxy resin, an acrylic resin, an alkyd resin, an epoxy resin, an acrylic-silicone resin, an acrylic modified urethane resin, a silicone resin, or the like, which may be an emulsion type, a water-soluble type, or a hydrophilic organic solvent-soluble type, may be mentioned. It is not limited.
These synthetic resins are usually used in an emulsion type, a water-soluble type or a hydrophilic organic solvent-soluble type.

Specific examples of the emulsion type synthetic resin include vinyl acetate resin emulsion, acrylic resin emulsion, acrylic-silicon resin emulsion, acrylic modified urethane resin emulsion, and silicone resin emulsion. Further, as a specific example of the water-soluble type, a water-soluble acrylic resin or the like can be mentioned. Further, specific examples of the hydrophilic organic solvent-soluble type include acrylic resin, amino alkyd resin, epoxy resin, butyral resin and the like. The above synthetic resin is 1
They may be used alone or as a mixture of two or more.

As the metal alkoxide, methyltrimethoxysilane, methyltriethoxysilane, dimethyldimethoxysilane, dimethyldiethoxysilane, trimethylmonomethoxysilane, trimethylmonoethoxysilane, phenyltrimethoxysilane, phenyltriethoxysilane and the like can be used. Can be mentioned. These metal alkoxides may be used alone or in combination of two or more. These binders are well mixed with water and / or hydrophilic organic solvent,
When dried, it forms a transparent or translucent film that is insoluble in water.

These (b) binders are used in the liquid composition.
It is contained in an amount of 4 to 28 parts by weight, preferably 6 to 24 parts by weight in terms of solid content. If the amount of binder used is less than 4 parts by weight,
When the obtained coating film has insufficient binding force or weak water resistance, on the other hand, when it exceeds 28 parts by weight, the coating force becomes too strong and the performance (antibacterial power, purification power) targeted by the present invention is obtained. )
Is less likely to occur and peels off easily, which is not preferable.

In the present invention, the liquid composition may contain (c) water and / or
Alternatively, a hydrophilic organic solvent is contained. The water in the component (c) is used for adjusting the viscosity of the liquid composition, adjusting the usable time (construction time), and preventing dispersion of the inorganic fine particles. As this water, tap water, distilled water, or ion-exchanged water can be used. Further, when silicate, colloidal silica, colloidal alumina or the like is used in the component (a), water contained in the component (c) is water contained in the colloid, and a synthetic resin which is the component (b). If is an emulsion-type or water-soluble type synthetic resin, the water contained therein is also included.

On the other hand, the hydrophilic organic solvent in the component (c) is an organic solvent which is compatible with water, and is used as an adjusting agent for the solid content concentration and viscosity of the liquid composition, a drying rate adjusting agent, or an antifreeze liquid agent. Used as. The hydrophilic organic solvent is alcohols, glycols or the like. Examples of alcohols include aliphatic alcohols having 1 to 8 carbon atoms, such as methanol, ethanol, n-propanol, i-propanol, n-butanol, sec-butanol, and t.
-Butanol, methyl carbitol and the like.
Examples of glycols include ethylene glycol, propylene glycol, diethylene glycol and the like. Of these, ethanol is preferable. This hydrophilic organic solvent can be used alone or as a mixed solvent of two or more kinds.

(C) The water and / or hydrophilic organic solvent preferably has a solid content of the liquid composition of 8 to 68% by weight, more preferably 12 to 54% by weight, and particularly preferably 20 to 40% by weight. To be mixed. However, as described above, (a) + (b) + (c) = 100 parts by weight. If the blending ratio of the component (c) is too low, the viscosity of the liquid composition increases too much, the storage stability decreases, and (a) to
If the dispersive power of the component (b) is poor, on the other hand, if it is too large, the storage stability is improved, but other components are relatively small, and the adhesion of the resulting coating film is weak, or the thin film is thin. There are times when it is not possible to make what you want.

The liquid composition of the present invention contains, in addition to the components (a) to (c), various surfactants, dispersants, curing modifiers, antibacterial agents, organic dyes and pigments, if necessary. Other additives can be included. The liquid composition is
When the components (a) and (b) are mixed and the component (c) is insufficient, the component (c) is further blended if necessary. At this time, the liquid composition is a high-speed stirrer,
By dispersing with a roll mill, ball mill, or other dispersing machine and then filtering, a uniform and stable dispersion liquid can be obtained.

To apply the above liquid composition to parts such as internal components for water purifiers, a coating means such as spraying, dipping or rubbing can be used. Here, in order to apply the liquid composition to the surface of the water purifier component, it is preferably 30 to 80 in terms of solid content per 1 m ² at a time.
Apply g. When coating is performed several times, the total coating amount is preferably 40 to 40 in terms of solid content per 1 m ^2.
It is 100 g. The coating film has a dry film thickness of preferably 3 to 30 μm. After applying the above liquid composition, it is dried at room temperature for 12 to 48 hours to be cured, or it is heated and dried at 50 to 120 ° C. for 0.5 to 3 hours to easily cure and form a coating film. Obtainable.

The coating film containing fine particles carrying silver thus obtained has a large surface area and an increased contact area with water, so that silver is likely to be uniformly ionized in a trace amount and always has a stable antibacterial activity. In addition, it is possible to prevent water stains from adhering to the components of the water purifier. The present invention can be applied to any conventional component for any type of water purifier. Further, the water purifier of the present invention is composed of the water purifier parts thus obtained, and can be applied to any type of water purifier that has been conventionally used. Specifically, activated carbon alone type, hollow fiber type combined with activated carbon, electrolytic type, magnetic type, natural stone type,
This includes all water purifiers such as ceramic type and reverse osmosis type.

[0021]

The present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples. In addition, parts and% in the examples
Are parts by weight and% by weight unless otherwise specified.

Synthesis Example 1 [Silver-supporting colloidal silica (a)]
-1] Dissolve 50 g of silver nitrate in 500 g of water, add 100 g of ammonia water (3% by weight concentration) to the solution, and filter the solution in which the first silver oxide precipitate is about to dissolve away. 400 ml was added to make 500 ml of a silver solution. 160 ml of this silver solution was put into 840 g of colloidal silica and mixed to adsorb and fix silver on the silica to obtain colloidal silica carrying silver. The silica content of the obtained colloidal silica (a) -1 was 24% by weight, the water content was 74% by weight, and the silver content was 1.3% by weight.

Synthesis Example 2 [Silver-supported titanium oxide fine particles (a)]
-2] 5 g of silver nitrate was dissolved in 500 g of water, 100 g of ultrafine particulate titanium oxide was added thereto, and the mixture was stirred, and then dried at 250 ° C. for 2 hours under normal pressure. To this, 500 g of water was added and mixed, and then filtered to obtain fine titanium oxide particles carrying water-containing silver. Water content 1 of the obtained titanium oxide fine particles (a) -2
5% by weight, average particle size = 0.02 μm, silver content 2.6% by weight
Met.

Synthesis Example 3 (Liquid Compositions A and B) Using the substances shown in Table 1, two kinds of liquid compositions A and B of the present invention were prepared. This composition was added to (a)
Components (c) and other additives, if necessary, were added, and the mixture was lightly stirred, then stirred for 10 minutes using a homogenizer (10,000 rpm), and filtered through a 200 mesh to prepare.

The symbols in Table 1 represent the following. (B) -1; Aqueous acrylic resin emulsion (solid content 4
9% by weight) (manufactured by Dainippon Ink and Chemicals, Inc.) (b) -2; methyltrimethoxysilane [CH ₃ Si
(OCH _{3) 3]} (Shin-Etsu Chemical Co., Ltd.) (c) -1; Ion-exchanged water (c) -2; ethanol (d) -1; silicone leveling agent

[0026]

[Table 1]

Example 1 (Activated carbon-ceramics) Inside the cover of the reforming water purifier body
1m of composition A on the surface ²Apply 35g per 60 ℃ at 60 ℃
A cover sample (1) was prepared by heating and drying for 2 hours.

Example 2 Composition B was applied to the inner surface of the outlet nozzle at a rate of 45 g / m ^2.
It was applied and similarly heated and dried at 60 ° C. for 2 hours to prepare an outlet nozzle sample (2).

Example 3 Composition A was coated on the inner surface of the cover of the main body of the magnetic water purifier in an amount of 30 g per m ^{2 and} dried by heating at 50 ° C. for 1.5 hours to prepare a cover sample (3).

Evaluation of Scale Adhesion A water purifier was assembled using Samples (1) and (2) and attached to a water tap that is frequently used. Comparative example (control)
As a result, a water purifier of the same type using a part having no inner surface of the cover [Comparative sample (1)] and a part having no inner surface of the outlet nozzle [Comparative sample (2)] was attached to another faucet. Average daily water consumption is 130-160
The tap water used had a calcium and magnesium content of 78 mg / liter. After using for 3 months in this state, remove it and sample (1),
(2) and the comparative samples (1) and (2) were examined and the state of adhesion of scale was observed. As a result, samples (1) and (2)
The control part had a total of 2.4 g of white powder (dry scale) as a comparative sample (1) and (2). From this, it was proved that the present invention has a remarkable effect in preventing adhesion of scale.

Antibacterial Evaluation An antibacterial activity test was carried out using samples (1), (2) and comparative sample (1). First, put the above sample in water 1
After soaking for 0 days, it was washed with water and immersed in water containing the bacteria shown in Table 2 to examine the antibacterial activity against water. The results are shown in Table 2.

[0032]

[Table 2]

Dissolution Evaluation Samples (1) and (3) were used to perform a dissolution test in hot water. 1 liter of tap water was warmed to 50 ° C., a sample was put therein, and the sample was kept in a heat-retaining box for 24 hours, and then the water quality was measured by an atomic absorption spectrophotometry. The results are shown in Table 3. The limits not detected by the atomic absorption spectrophotometry are shown in Table 3 for each metal.

[0034]

[Table 3]

[0035]

EFFECTS OF THE INVENTION By using a component such as an internal component for a water purifier, which is obtained by the method of the present invention and whose surface is coated with a film containing inorganic fine particles carrying silver, scale is adhered to the inside thereof. Without doing so, it is possible to obtain a water purifier in which fungi are not generated or propagated.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) C02F 1/46 C02F 1/46 Z 1/50 510 1/50 510B 510C 510E 520 520B 531 531E 540 540F C09K 3 / 00 112 C09K 3/00 112F 112Z (72) Inventor Harusuke Harano 3-50 F Term, Okamoto Minami-ku, Fukuoka City, Fukuoka Prefecture (Reference) 4D006 GA01 HA01 JA70Z KD06 MA01 PA01 PB06 PC51 4D024 AA02 BA02 CA13 DB05 DB09 DB27 4D061 DA03 FA10 4D064 AA17 BJ05 4H011 AA02 BA01 BB18 BC03 BC18 BC19 DA14 DC05 DD01 DH02 DH07

Claims (3)

[Claims] 1. (a) 2 to 12% by weight of silver based on solid content
4 to 40 parts by weight, in terms of solid content, of inorganic fine particles having an average particle size of 3 μm or less and carrying 2 to 12% by weight of the supported inorganic colloidal substance and / or silver with respect to the solid content, and (b) a synthetic resin as a binder. And at least one selected from the group consisting of and metal alkoxides in an amount of 4 to 28 parts by weight in terms of solid content, and (c) water and / or a hydrophilic organic solvent (provided that (a) + (b) + (c)). = 100 parts by weight] on the surface thereof, a film formed by applying a liquid composition. 2. (a) 2 to 12% by weight of silver based on the solid content
4 to 40 parts by weight, in terms of solid content, of inorganic fine particles having an average particle size of 3 μm or less and carrying 2 to 12% by weight of the supported inorganic colloidal substance and / or silver with respect to the solid content, and (b) a synthetic resin as a binder. And at least one selected from the group consisting of and metal alkoxides in an amount of 4 to 28 parts by weight in terms of solid content, and (c) water and / or a hydrophilic organic solvent (provided that (a) + (b) + (c)). = 100 parts by weight] is applied to a part for water purifier and cured by heating at room temperature or low temperature to form a film on the surface of the part for water purifier. 3. A water purifier having the water purifier component according to claim 1 as a structural component.