JP2693111B2 - Method for preventing damage to the surface to be magnetized in the magnetizing fixture - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for preventing damage to a surface to be magnetized in a magnetizing fixture for magnetically fixing an article to a steel wall surface or the like by applying a magnet.

[0002]

2. Description of the Related Art As a technique for preventing damage to a surface to be magnetized in a conventional magnetizing fixture, for example, Japanese Utility Model Publication No. 61-856.
After the magnet is fitted into the recess of the magnetic plate provided on the back surface of the magnetic attachment fixture, as in the "magnetic suspension device" introduced in Japanese Patent No. 6, is an adhesive tape attached to the magnetic plate and the surface of the magnet? Alternatively, a very thin polyethylene film is sandwiched between the surface to be magnetized and the magnetic plate for use. Since the former adhesive tape is usually made of cloth gum tape, the appearance is unsightly, does not have a high-class appearance, and the magnetic force is slightly reduced. In addition, tears due to friction and sticking residue on the target surface of the traces adhere to the target surface, and thereafter, scratches and stains are generated on the target surface magnetically adhered over time. In the case of the latter, it is necessary to insert a polyethylene film between the target surface and the fixture or attach a double-sided tape every time the fixture is used, which is a waste of labor and material, Various defects such as stain discoloration with time are observed.

[0003]

Problems to be Solved by the Invention In the present invention,
It is an object of the present invention to eliminate the above-mentioned drawbacks in the prior art, improve the damage prevention effect on the surface to be magnetized in the magnetizing fixture, and to develop a method of retaining the magnetizing force and preventing damage with durability. In order to prevent contact scratches on the surface to be magnetized when a magnet is applied, the problem is to be solved in view of the situation in which the value is reduced in use due to the above-mentioned drawbacks of the prior art. . In a magnetic attachment fixture that applies a magnet to support an article, for example, in the case of a magnetic attachment suspension, a method of coating a magnetic plate (referred to as a yoke) holding a magnet with a damage prevention material. , Creates and maintains a strong magnetic action on the magnetic surface,
As a damage preventing method for preventing damage such as abrasion due to the removal, it is a method of effectively coating the magnetic plate, and the optimum coating material is used.

[0004]

Means for Solving the Problems As a coating material for achieving the above object, a resin obtained by condensing a polybasic acid and a polyhydric alcohol, which does not contain a fatty acid added to a paint, is used. The performance of the coating film is adjusted by the selective blending of various components with polyhydric alcohol.The urethane resin polymer is added to these coating materials in the form of spherical beads. It gives a high-quality coating that is smooth and velvety and does not cause contact scratches. When a magnetic attachment fixture with this coating material applied to the surface of a magnetic plate is magnetically attached to a steel desk, steel wall, refrigerator wall, or other target surface that can be magnetically attached, a strong magnetic attachment force is continuously applied. It will be retained.

[0005]

As described above, when the coating material according to the present invention is applied to the magnetically adhered surface of the magnetically adhered fixture and subjected to the coating process, the coated surface (painted surface) can be finished in a velvety texture. Therefore, contact scratches do not occur on the surface to be magnetized, a strong magnetizing force is maintained, and the supporting force of the article does not decrease.

[0006]

Embodiment FIG. 1 of the accompanying drawings is a cross-sectional view of a main part showing an embodiment in which a coating material according to the present invention is applied to a magnetically adhering surface of a magnetically adhering fixture A to form a coating. Code 1
Is an article supporting convex portion, and 2 is a magnetic plate. The magnetic plate 2 has a peripheral cylindrical portion 2b extending around a circular plate 2a having the article supporting convex portion 1 in the center thereof. A concave portion is formed, a circular magnet 3 is fitted in the concave portion, and a coating material is applied from the outer peripheral surface of the peripheral cylindrical portion to the surface of the magnet 3 to form a coating film 4. In FIG. 2, the cross section of the state of the coating film 4 formed is observed under a microscope at a magnification of 200 times, and the coating film 4 is velvet-like on the surface of the material 5 with the undercoating primer layer 6 interposed therebetween. And extends to the material 5 and adheres to it.

As the coating material, a resin obtained by condensing a polybasic acid and a polyhydric alcohol is used, and various components of the polybasic acid and the polyhydric alcohol are appropriately selected and blended to improve the performance of the coating film. It is prepared by adjusting, and its main components are spherical resin beads made of polyurethane resin and modified component of polyester resin, and phthalic anhydride C ₆ H ₄ (CO) ₂ O and isophthalic acid as polybasic acid. Acid C ₆ H ₄ (COOH) ₂ , adipic acid HOOC (CH ₂ ) ₄
COOH, sebacic acid HOOC (CH ₂ ) 8-COOH
As a polyhydric alcohol, one or two kinds of
Neopentyl glycol HOCH ₂ (CH ₃ ) ₂ CH ₂ O
H, trimethylolpropane CH ₃ CH ₂ C (CH ₂ O
H) ₃ , hexane methylene glycol HO (CH ₂ ) 6O
H, 1,2-propanediol CH ₃ CH (OH) CH ₂
One or two kinds of OH were mixed and the performance of the coating was adjusted by the blending ratio.

The blending ratio is, for example, 15% to 20% of polyurethane resin (spherical bead shape) and 10 of modified polyester resin (arbitrary mixture of polybasic acid and polyhydric alcohol).
% To 15%, 0.5% added with epoxy resin as a reinforcing material
~ 0.7%. In order to obtain a viscosity suitable for coating, the above three components were used as main components and diluted with the following solvents. Hydrocarbon solvent 40% to 50%, alcohol solvent 2% to 3%, ketone solvent 0.1% to 0.3%, ester solvent 2% to 3%.

When coloring is required, pigments of each color are added for coloring. For example, when coloring in black, black iron oxide 1% to 2%, carbon black 0.1%
Add ~ 0.5%. The coating material obtained by the above mixing is uniformly applied to the magnetic plate by a spraying method according to the conventional coating technique to obtain a coating film having a film thickness of 30 to 80 μm, and then baked and dried at 130 to 140 ° C. for 30 minutes,
It is possible to obtain a velvety film having a smooth surface.

FIG. 3 shows a pair of the magnetic attachment fixtures A shown in FIG. 1 on the left and right sides, and both magnetic attachment fixtures are incorporated into both sides of the article suspending device B for magnetic attachment. As shown in the exploded view, the article supporting protrusion 1 of the magnetic attachment fixture A is inserted from the rear between the parallel rods 7 of the article suspending tool B, and the head 8 is protruded from the opposite side from the front. By horizontally inserting the pin 9 into the fitting portion from the side, the parallel rods 7, 7 are sandwiched between the back portion of the head portion 8 and the front surface of the circular plate 2a of the magnetic plate 2. It is constructed so as to be coupled with each other, and the article is hung and supported by a plurality of hook rods 10 ...

FIG. 4 shows a flaw adhesion test method for testing the presence or absence of flaws by sliding the magnetic attachment fixture A coated with a coating on the surface C to be magnetized in the present invention. , As shown in the figure, the magnetic attachment fixture A is pressed downward by three methods of sliding from the direction A to the direction B, the direction B to the direction C, and the direction C to the direction C. The test results shown in Table 1 were obtained.

[Table 1]

Further, in order to investigate the relationship between the thickness of the coating film and the scratch adhesion property, the test method shown in FIG. 4 was conducted on 8 kinds of films having different film thicknesses, and the test results shown in Table 2 were obtained. From this test result, it was confirmed that there was no scratch adhesion at 30 μm or more and 80 μm.

[Table 2]

In order to examine the physical properties of the coating film, 100 pieces having a thickness of 50 μm ± 5 μm and a 1 mm grid were prepared, and the adhesion test was conducted with a cellophane tape.
It was confirmed that the adhesion was good at / 100. The hardness of the coating was tested with a Mitsubishi Uni-Pencil, and the hardness was 2H.

In order to examine the chemical resistance of the coating film, the results of the immersion test in the chemical solution were obtained as shown in Table 3. The conditions of the test are soaking at room temperature for 240 hours.

[Table 3]

In order to investigate the influence of the coating process of the present invention on the magnetic attachment fixture, the magnetic force was measured by the method shown in FIG. 5, and as a result, the surface magnetic flux density (GAUSS) shown in Table 4 was obtained. ) Was measured. In FIG. 5, the magnet is an anisotropic strontium ferrite magnet, and the measuring instrument is a GAUSSMETER MODEL 62.
0 (FW, manufactured by BELL). In this measurement, there was some deflection of the measuring meter needle depending on how the measuring instrument was applied, but it was within ± 2 on average. In Table 4, the data A is the one to which the coating film according to the present invention is applied, and the data B is the known technique (Jitsuko Sho 61-
The one introduced in Japanese Patent No. 8566. ) Shows an adhesive tape attached. The thickness of the tape is 100 μm
It is. In the material A, the film thickness is 0 to 100.
In the 8 grades up to μm, in the B material, the tape thickness was 0 and 100 μm.

[Table 4] By this test, the magnetic sticking force of the adhesive tape of the known art is slightly decreased, but the magnetic sticking force of the present invention is unchanged without being affected by the coating film. Confirmed to maintain.

[0016]

As a result of the above test, the present invention shows that when the coating film thickness is 30 μm or more, contact scratches do not occur on the surface to be magnetized, the adhesion is good, and the film hardness is 2H. The film is not easily attacked by impact, it is also strong in chemical resistance, it is not easily attacked by drugs and other chemical components, and the magnetic force does not decrease because the coating film is applied. It can maintain the magnetic force, has durability, and can be provided as a perfect magnetic attachment fixture.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a magnetic attachment fixture to which a coating process of the present invention is applied.

FIG. 2 is a cross-sectional view in which a cross section of a coating film forming state according to the present invention is observed 200 times under a microscope.

FIG. 3 is a perspective view showing an article suspending tool in which the magnetic attachment fixing tool shown in FIG.

FIG. 4 is an explanatory diagram illustrating a method for testing the presence or absence of contact scratches between the coating film and the surface to be magnetized.

FIG. 5 is an explanatory view showing a method for measuring a change in magnetic force due to a film of a magnetic attachment fixture.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Article support convex part 2 ... Magnetic plate (yoke) 2a ... Circular plate 2b ... Peripheral cylinder part 3 ... Magnet 4 ... Coating film 5 ... Material 6 ... Primer layer 7 ... Parallel rod 8 ... Head 9 ... Pin 10 ... Hook Rod

Claims (3)

(57) [Claims] 1. A magnet is held in a concave portion of a magnetic plate provided on the back surface of the body of the magnetic attachment fixture, and a coating material for preventing damage is applied to the surfaces of the magnetic plate and the magnet to form a film. A method for preventing damage to a surface to be magnetized in a magnetizing fixture. 2. As a coating material for preventing damage, a resin obtained by condensing a polybasic acid and a polyhydric alcohol is used, and the performance of the coating film is adjusted by selectively blending various components of the polybasic acid and the polyhydric alcohol. The method for preventing damage to the surface to be magnetically adhered in the magnetically-immobilized fixture according to claim 1, wherein 3. A polyurethane resin in the form of spherical beads and a modified component of a polyester resin are mixed with one or two of phthalic anhydride, isophthalic acid, adipic acid and sebacic acid as polybasic acids, The magnetic attachment according to claim 2, wherein one or two kinds of neopentyl glycol, trimethylolpropane, hexanemethylene glycol, 1,2 propanediol are mixed as the polyhydric alcohol, and the performance of the coating film is adjusted by the mixing ratio thereof. A method for preventing damage to a surface to be magnetized in a fixture.