JPH0978003A - Coating material for shielding raw-frequency fluctuation magnetic field and member with shield - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject coating material capable of excellently shielding a raw-frequency fluctuation magnetic field, hardly being limited in use, shape, etc., having a wide application range, capable of protecting a human body from a raw-frequency fluctuation magnetic field, by blending a coating material with a magnetic material. SOLUTION: (A) A coating material [e.g. an (amino)alkyd resin coating material, acrylic resin or epoxy resin coating material] properly containing a solvent (e.g. mineral spirit or xylene), pigment (e.g. corrosion-resistant pigment or colored pigment for coating material), an auxiliary (e.g. desiccant or wetting agent), etc., is mixed with (B) a magnetic material (e.g. iron carbonyl, iron reduced with hydrogen, a magnetic material of high magnetic permeability as an Fe-Ni alloy having 35-80wt.% Ni content) in a powdery, foil or fibrous state, etc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to low frequency (eg,
The present invention relates to a coating material for a low frequency fluctuation magnetic field shield and a shielded member suitable for reducing or avoiding the influence of a fluctuation magnetic field on a human body.

[0002]

2. Description of the Related Art In recent years, low frequencies (for example, 10 Hz-10
The influence of a fluctuating magnetic field on the human body is becoming widely considered, especially in developed countries outside Japan.

The animals that live on Earth live in the natural magnetic field of the Earth, while living in a large number of artificial low-frequency fluctuating magnetic fields.

Such a low-frequency fluctuating magnetic field is generated from a high-voltage power transmission line, medical equipment, photographic lighting equipment, commercial hair dryer, microwave oven, mobile phone and the like.

It is suspected that sudden human death, infantile autism, etc. may occur in humans sensitive to such low-frequency fluctuation magnetic fields, especially in young people such as infants, nursery school children, and elementary school children. It is known that, including adults,
It is suspected that it may cause brain tumor, cancer, Alzheimer's disease, mental stress, headache, chronic fatigue, etc.

Therefore, it is difficult for us to avoid the natural magnetic field of the earth, but in order to avoid the artificially generated low-frequency fluctuation magnetic field, in the countryside where high-voltage power transmission lines are not nearby, Although it is necessary to live a life that does not use conventional electrical equipment, this is difficult in a realistic life, and people live while using various electrical equipment and medical equipment.

Therefore, it is not unthinkable to use a plate material made of a magnetic material with high magnetic permeability as a shield material for a low-frequency fluctuating magnetic field, for example, in combination with a case of a microwave oven.

[0008]

However, as described above, when a plate material made of a high magnetic permeability magnetic material is used as a low frequency fluctuating magnetic field shield material, it is used in combination with a microwave oven case or the like. Although it may be easily applicable in the case of a simple box shape, the shape of the peripheral part surrounding the low frequency fluctuation magnetic field generation source is complicated, and appropriate flexibility is required. However, there is a problem that it is not suitable to adopt the plate material made of the above-mentioned high magnetic permeability magnetic material.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems and is capable of excellently shielding a low-frequency fluctuating magnetic field, and has a use or form as in the case of a plate material. It is an object of the present invention to provide a user-friendly low-frequency fluctuation magnetic field shield material having almost no limitations.

[0010]

The coating material for a low frequency fluctuation magnetic field shield according to the present invention is characterized in that, as described in claim 1, a magnetic material is mixed in the coating material. There is.

Further, in an embodiment of the coating material for a low frequency fluctuation magnetic field shield according to the present invention, as described in claim 2, a powdery material is contained in a coating material containing a solvent, a pigment, an auxiliary material and the like as appropriate. , A magnetic material such as a foil or a fiber can be mixed.

Further, in the same manner, as described in claim 3, the magnetic material may be a high magnetic permeability magnetic material.

Further, the member with a low frequency fluctuation magnetic field shield according to the present invention has the base material as described in claim 4, and the low frequency fluctuation magnetic field shield according to any one of claims 1 to 3. It is characterized in that it is constructed by applying paint.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION The coating material for a low frequency fluctuation magnetic field shield according to the present invention has a constitution in which a magnetic material is mixed in the coating material. First, the coating material will be described.

In the paint generally referred to, the anticorrosive property is the most important property among the properties of the coating film, but in the present invention, the dispersibility of the magnetic material is good and the corrosion to the magnetic material is good. Smallness is also an important property.

Examples of such paints include oil paints such as linseed oil, soybean oil, and natural resins, fibrin derivative paints such as nitrocellulose and ethyl cellulose, and phenol resin paints including resole type resins and novolac type resins. , Alkyd resin paints containing polybasic acids, polyhydric alcohols and fatty acids as basic components, amino alkyd resin paints using amino resins and alkyd resins as film forming elements, amino acrylic resin paints, NAD (non-aqueous) Acrylic resin paints such as acrylic resin paints, vinyl chloride resin paints such as solution type vinyl chloride resin paints, sol type vinyl chloride resin paints, silicone resin paints suitable for electrical insulation, heat resistance, etc., Fluororesin coatings such as thermoplastic fluororesin coatings and thermosetting fluororesin coatings, catalyst curing type, light Epoxy resin coatings such as epoxy resin coatings, epoxy resin coatings, epoxy resin coatings, epoxy ester coatings, vinyl ester coatings, baking curing epoxy coatings, and two-component polyurethane resin coatings , Polyurethane resin paints such as urethane oil, moisture curing type polyurethane resin paints, block type polyurethane resin paints, emulsion paints used as interior and exterior paints for buildings, anion type electrodeposition paints, cation type electrodeposition paints , Water-soluble resin paint such as room temperature dry type water-based paint, polyethylene resin, polyvinyl chloride resin, polyamide (nylon) resin (above, thermoplastic),
Different from other general paints, such as epoxy resin, hydroxyl group-modified polyester resin, glycidyl group-modified acrylic resin (above, thermosetting), etc. It can be adopted from the inside by considering the application and properties.

For such paint, a solvent is used except the powder paint in order to adjust the viscosity of the paint and to make the coating and film formation smooth.

The solvent generally occupies about 40 to 50% by weight in the paint, but it is not limited to this and can be appropriately adjusted. Almost all amount is released into the atmosphere after drying. Therefore, it is sometimes desirable to use a solvent with a reduced amount used.

Examples of such a solvent include petroleum-based solvents such as mineral spirit, and organic solvents such as benzene, toluene, xylene, ethylbenzene, cyclohexane, ethylcyclohexane, chlorobenzene, perchloroethylene, methyl alcohol, ethyl alcohol, Isopropyl alcohol, butyl alcohol, isobutyl alcohol, 2-butanol, benzyl alcohol, cyclohexanol, ethyl acetate, butyl acetate, isobutyl acetate, acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexane, isophorone, diacetone alcohol, cellosolve, butyl cellosolve, cellosolve acetate Tart, Carbitol Acetate, 1,4
-Dioxane, tetrahydrofuran, N, N-dimethylformamide, 2-nitropropane, styrene and the like, which are appropriately selected in consideration of the properties of the coating material and the coating method.

Further, in addition to a solvent, a pigment is appropriately added to the paint, and precipitated calcium carbonate, barium sulfate, talc, clay, clay, etc. are added to improve coating workability and strengthen mechanical properties of the coating film. White carbon may be used, or as anticorrosion pigment, zinc chromate, strontium, chromate, lead oxide, lead suboxide, basic chromate, cyanamide lead, calcium lead phosphate, zinc phosphate, phosphate There are aluminum, potassium phosphate, etc., and if necessary, they can be appropriately selected and used from these.

As the color pigments for paints, titanium dioxide and zinc white which are inorganic pigments as white, yellow lead, yellow iron oxide, ocher, titanium yellow which are inorganic pigments as yellow, and Hansa Yellow which is an organic pigment, Permanent Yellow, Chromophthal Yellow, Hosta Palm Yellow, Irgadine Yellow, Resor Fast Yellow,
Chromophthal yellow, paliogen yellow, green gold, azomethine-based copper complex pigment, polyotol yellow, orange inorganic pigment molybdate orange, organic pigments Nova palm orange, hosta palm orange, and red inorganic pigment. Some red iron oxide, organic pigments such as watching red, lake red, permanent carmine, quinacridone red, perylene red, bordeaux, thioindigo red, quinacridone maroon, perylene maroon, and purple red iron oxide as purple and organic pigment quinacridone violet. , Dioxazine violet and blue as inorganic pigments dark blue, ultramarine blue, cobalt blue, organic pigments such as copper phthalocyanine, metal-free phthalocyanine, indanthrone blue and green Inorganic pigments such as chrome green and chromium oxide, organic pigments such as chlorinated copper phthalocyanine and brominated copper phthalocyanine, and inorganic pigments such as carbon black and iron black. It can also be selected for use.

Further, the auxiliary material (additive) plays an important role in each stage of the production, storage, painting, film formation, and drying of the coating film, for example, for promoting the drying of the coating film. , Cobalt naphthenate, lead naphthenate, manganese naphthenate as a desiccant, benzoyl peroxide, methyl ethyl ketone peroxide as a polymerization catalyst (peroxide), paratoluene sulfonic acid, dodecylbenzene sulfonic acid as a polymerization catalyst (acid), etc. In some cases, a wetting agent, a pigment dispersant, an anti-flooding agent, a pigment anti-settling agent, etc. are sometimes used to improve the pigment dispersibility. Water-based paint as tropic agent and anti-sag agent: carboxymethyl cellulose, sodium alginate, non-water-based paint: colloid Silica, organic bentonite, aluminum stearate, hydrogenated castor oil, polymerized vegetable oil, amide wax, etc. are used in some cases. As a leveling agent, defoaming agent, anti-repellent agent, anti-floating agent for adjusting the coating surface, Silicone oil, silicone resin, polyether polyacrylic acid ester copolymer, etc. are sometimes used.
As a plasticizer, dibutyl phthalate, dioctyl phthalate, di-2-ethylhexyl methyl phthalate, as an anti-skin agent, ethyl ketone oxime, phenol compound, as an electrostatic coating aid, alcohols, alkoxyamines, Micro-crystalline wax, silicone oil as anti-scratch agent, anti-blocking agent, benzotriazole as UV absorber, triphenyltin compound, tributyltin compound, organic sulfur compound, antiseptic agent as antifouling agent As agents, formalin, isothiazoline compounds, hexahydrotriazine compounds, and as antifungal agents, benzimidazole, tetrachloroisophthalonitrile, parachlorometaxylenol, etc. can be used in some cases.

Furthermore, a magnetic material such as powder, foil, or fiber is mixed in a coating material containing such a solvent, pigment, auxiliary material (additive), etc. as a coating material for a low frequency fluctuation magnetic field shield. However, as the magnetic material mixed here, a high magnetic permeability magnetic material can be used.

The high permeability magnetic material is a magnetic material having an initial permeability of about 10 ² or more, and is also called a soft magnetic material.

As the high magnetic permeability magnetic material, (1) the saturation magnetic flux density B _s is high, (2) the coercive force H _c is low,
It is desired that the initial magnetic permeability μ ₁ and the maximum magnetic permeability μ _m are high, the hysteresis loss _Wh is small, and (3) the specific resistance ρ is high.

Specifically, for example, there are pure iron and soft iron,
Pure iron includes carbonyl iron, electric field iron, and hydrogen-reduced iron.

Fe--containing 35 to 80% by weight of Ni--
There is also Permalloy, which is a Ni alloy. Of these, 70-8
PC permalloy containing about 0% by weight of Ni can obtain a remarkably high initial magnetic permeability by the quenching treatment.

Further, the low Ni-Fe PB, PE permalloy having a Ni content of about 35 to 55% by weight is characterized by a high saturation magnetic flux density B _s , a high specific resistance ρ and a low price.

Binary PC with Ni content around 79% by weight
The addition of a third element such as Mo, Cr, or Cu to permalloy suppresses the formation of Ni ₃ Fe ordered lattice, and if cooled at an appropriate speed without quenching treatment, it is 78.5 wt% NiPC permalloy. The magnetic permeability is several times higher than that of.

In addition, Alperm which is an Al-Fe alloy of 10 to 16 wt%, Sendust which is 9.6 wt% Si-5.4 wt% Al-Fe, and 45 wt% Ni-2.
Permine bar which is 5% by weight Co-Fe and 50% by weight
Iso-palm, which is Ni-Fe, and electromagnetic stainless steel, such as 13Cr stainless steel and 18Cr stainless steel, are also available.

Further, as the high-permeability magnetic material, in addition to the above-mentioned alloy-based materials, there are oxide-based materials.
Ferrite, which is a ferrimagnetic oxide containing e ₂ O ₃ as a main component, is also included. And in this ferrite, M
O.Fe ₂ O ₃ (M is 1 of Mn, Ni, Cu, Zn, etc.)
There is also a spinel type ferrite represented by (1 or more kinds), and by using it as a composite ferrite of Mn-Zn type, Ni-Zn type, etc., it can be made to have high magnetic permeability and high specific resistance.

And, such a high magnetic permeability magnetic material is
It is used as powder, foil, fiber, etc., and there are mechanical crushing method of ingot, centrifugal quenching method, single roll quenching method, twin roll quenching method, water atomizing method, gas atomizing method, etc. It can also be in the form of a fragment foil.

The powdery, foil, fibrous, and other high magnetic permeability magnetic materials are blended with the above-mentioned coating material and appropriate solvents, pigments, and auxiliary materials (additives) to obtain a low-frequency fluctuating magnetic field according to the present invention. It is used as a shield paint.

Then, when it is made into a fragment foil shape or a fibrous shape, it becomes a low frequency fluctuating magnetic field railed paint which can be applied with a desired directionality.

This low frequency fluctuation magnetic field shield coating is applied to, for example, a high-voltage power transmission line, and is applied or penetrated into cases or covers of magnetic field generating sources of medical equipment, thrusts between medical equipment, medical clothes, and the like. It is applied to a cover of a commercial hair dryer or the like, applied to a cover of a microwave oven or a mobile phone, or applied or penetrated into gloves, an apron or the like to be used as a member with a low frequency fluctuation magnetic field shield.

In applying, coating, and permeating (in the case of a woven cloth, a non-woven cloth, etc.) onto the base material, such a coating material for a low-frequency fluctuation magnetic field shield, in addition to a very general brush coating, it is possible to apply it from the outer peripheral nozzle. Air spray painting that sprays compressed air and sprays paint from the inner peripheral nozzle to atomize the paint on the same principle as atomization, or hydraulic atomization method that applies high pressure to the paint and sprays it from the nozzle in a spray state. The airless spray coating, which is a method of applying a high voltage between the object to be coated and the coating machine, forms an electric field and charges the atomized paint to electrostatically adsorb it to the object. Electrostatic coating, powder coating that mixes solvent-free coating, pigment, auxiliary materials (additives), etc., is sprayed on the surface of the object to be coated, and a coating film is formed by heating. Dipping the conductor coating in the Electrodeposition coating that agglomerates the paint particles dispersed in the coating bath on the object to be coated by electric force, curtain flow coating suitable for coating plate-shaped objects, and roll surface There is roll coating in which a part or the whole of the above coating material is transferred to the object to be coated, and it can be appropriately selected from various coating methods and adopted.

[0037]

EXAMPLE 1 FIG. 1 shows an example of the present invention in which the member with a low frequency fluctuation magnetic field shield is a hair dryer.

On the inner and outer surfaces of the base material 2 of the hair dryer 1, the low frequency fluctuation magnetic field shield coating 3a, 3b is formed by applying or coating the low frequency fluctuation magnetic field shield coating. It shows the case.

In this case, the coating film 3a on the inner circumference side shields the customer from the low frequency fluctuation magnetic field, and the coating film 3b on the outer circumference side shields the beautician from the low frequency fluctuation magnetic field.

Embodiment 2 FIG. 2 shows another embodiment of the present invention, in which the member with a low frequency fluctuation magnetic field shield is a high voltage power transmission line.

The outer surface of the base material (electric wire) 12 of the high-voltage power transmission line 11 hung between the steel towers 10 and 10 is coated or painted with a low-frequency fluctuation magnetic field shield coating, so that Coating film for frequency fluctuation magnetic field shield 13
It shows the case where is formed.

Therefore, it becomes possible to protect the residents near the high-voltage power transmission line 11 from the low-frequency fluctuation magnetic field.

[0043]

The coating composition for a low-frequency fluctuation magnetic field according to the present invention, which has the above-described structure, can effectively shield a low-frequency fluctuation magnetic field and is used in the same manner as when a plate material is used. The form etc. are almost not limited, and the applicable range can be wide,
The remarkable effect that the human body can be protected even from a low frequency fluctuation magnetic field is provided.

[Brief description of drawings]

FIG. 1 (A) is a perspective view of a hair dryer showing an embodiment of the present invention, and FIG. 1 (B) is a sectional explanatory view of the hair dryer.

FIG. 2 (A) is a perspective view of a high voltage power transmission line hung between steel towers showing another embodiment of the present invention.
(B) is a cross-sectional view of a high-voltage power transmission line.

[Explanation of symbols]

 1 Hair Dryer (Member with Low Frequency Fluctuation Magnetic Shield) 2 Base Material 3 Coating (Paint for Low Frequency Fluctuation Magnetic Shield) 11 High Voltage Transmission Line (Member with Low Frequency Fluctuation Magnetic Shield) 12 Base Material 13 Coating (Low Frequency Fluctuation) Paint for magnetic field shield)

Claims (4)

[Claims] 1. A coating material for a low frequency fluctuation magnetic field shield, characterized in that a magnetic material is mixed in the coating material. 2. The low frequency fluctuation according to claim 1, wherein a magnetic material such as powder, foil or fiber is mixed in a coating material containing a solvent, a pigment, an auxiliary material and the like as appropriate. Paint for magnetic field shield. 3. The coating material for a low frequency fluctuation magnetic field shield according to claim 1, wherein the magnetic material is a high magnetic permeability magnetic material. 4. A member with a low frequency fluctuation magnetic field shield, which is obtained by applying the coating material for a low frequency fluctuation magnetic field shield according to any one of claims 1 to 3 to a base material.