JP2009154035A - Method of applying coating material containing powdery magnetic body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To cause a particular coating effect by giving the change of magnetic force to a magnetic coating material. <P>SOLUTION: The density of a powdery magnetic body in the magnetic coating material is changed in accordance with the magnet force and a particular effect part 64 is formed on a part of coating by overlapping two cut pieces obtained by cutting a magnet sheet belt-like and constituting a sheet-like magnet, closely attaching to the back surface of a member to be coated and applying the magnetic coating material on the surface. In such a way, the coating on a cross coating part 63 corresponding to the overlapped part is made most dense to form a clear outline 65 on the peripheral part and to change the whole coating color to form gradation to exhibit the particular coating effect. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to a coating method using a paint containing magnetic powder (hereinafter referred to as a magnetic paint).

A sheet-like magnet obtained by kneading a large number of magnetic particles into a sheet shape and cutting it into a predetermined shape is fixed to the back surface of the member to be coated, and a liquid magnetic material is applied to the painted surface of the member to be coated. A coating method is known in which a coating material is applied and the magnetic powder in the magnetic coating material is subjected to orientation or density change in a specific direction by the magnetic force of a sheet magnet to achieve a special color tone effect.
JP-A-3-30876

By the way, in the above-mentioned coating method, if the thickness of the member to be coated is constant, the sheet magnet that is uniformly in contact with the back surface of the member to be coated has a constant distance from the painted surface over the entire range. Since the magnetic force on the coated surface where the sheet magnets overlap is constant over the entire range, the effect of orientation by the magnetic force on the magnetic powder is constant, and the coating effect is changed, such as changing the density partially. I couldn't make it.
On the other hand, if the change in magnetic force of the sheet-like magnet can be utilized, it can be expected that more various coating effects can be obtained.
Therefore, the present invention has an object to realize such a special painting effect.

In order to solve the above-mentioned problems, the invention according to claim 1 relating to a method of applying a paint containing magnetic powder is a method of applying a paint containing magnetic powder on the surface in a state where a magnet is arranged on the back surface of the member to be coated. In
The magnet uses a plurality of sheet magnets obtained by kneading a plurality of magnetic particles into a base material sheet and then magnetizing them.
Fixing the plurality of sheet magnets on the back surface of the member to be coated in a partially overlapped state,
In this state, a coating material containing magnetic powder is applied to the surface of the member to be coated.

  A second aspect of the present invention is characterized in that, in the first aspect, the magnetic poles of the magnetized magnetic particles are arranged in a plurality of parallel lines.

  A third aspect of the present invention is characterized in that, in the first aspect, the sheet-shaped magnet has a plurality of magnetic poles of the magnetized magnetic particles arranged randomly on the entire surface.

According to a fourth aspect of the present invention, in the second aspect of the present invention, the plurality of sheet-shaped magnets are arranged so as to overlap each other, and the magnetic pole array directions of the respective sheet-shaped magnets intersect with each other in the overlapping portion. It is arranged.

  According to the invention of claim 1, a plurality of sheet magnets are stacked and fixed on the back surface of the member to be coated, and in this state, the paint containing the magnetic powder is applied to the surface of the member to be coated. As for the magnetic force, the overlapping portion of the plurality of sheet-like magnets becomes strongest, and the magnetic force changes partially. Due to this change in magnetic force, the orientation and density of the magnetic powder in the magnetic coating material are changed, so that it is possible to realize special coating effects that are rich in changes, such as changes in the shading of the coating and the sharpness of the contour line.

  According to the invention of claim 2, by using the sheet-like magnet in which the magnetic poles of each magnetized magnetic particle are arranged in a plurality of parallel lines, the sheet-like magnets are not overlapped and are separated. A stripe-like paint pattern is formed on the parts used in the above, and a special paint effect with a variety of changes such as a grid pattern can be realized on the overlapped part.

  According to the invention of claim 3, by using the sheet-like magnet in which the magnetic poles of each magnetized magnetic particle are randomly arranged, the overlapped portion becomes dark because of the strong magnetic force, and the surrounding portion Since the magnetic force is increased, it is possible to form a paint pattern with an emphasized outline.

According to the invention of claim 4, by preparing a plurality of sheet-like magnets in which the magnetic poles of each magnetized magnetic particle are arranged so as to form a plurality of parallel lines, and superimposing them so as to cross each other Depending on the crossing angle, the paint pattern can be changed in various ways, such as grid or wave, to achieve a special paint effect.

  Embodiments will be described below with reference to the drawings. FIG. 1 is a diagram showing the surface side of a coated product 10, and shows a state where a coating film 60 coated with a magnetic paint is formed on the surface. Part of the coating film 60 is formed with a special effect portion 64 that forms a special coating effect by a magnetic force change using a magnet. This portion includes coating portions 61 and 62 corresponding to two sheet-like magnets (magnets) described later, and a cross-coating portion 63 corresponding to an intersection portion of the two sheet-like magnets. This portion is darker than the surrounding portion and forms a clear outline.

The painted product 10 is a plate-like exterior part such as a cowl for a motorcycle, is made of an appropriate resin material such as polycarbonate, and is a molded product having a three-dimensional curved surface. It has been smoothed in advance.
The material of the coated product 10 is a non-magnetic material. In the present magnetic coating that uses a sheet-shaped magnet to produce a special effect, a non-magnetic material is preferable so that the magnetic field lines of the sheet-shaped magnet are not subject to unintended changes.
In addition, the thing of the pre-painting state of the coated product 10 shall be distinguished as a member to be coated 10A (FIG. 4) which is a member to be painted.

  FIG. 2 is a view showing the surface side of the jig 20 used for the magnetic body coating. The jig 20 is formed in a shape approximate to the member to be coated 10A so as to be superimposed on the back surface (surface opposite to the painted surface) of the member to be coated 10A, and is made of an appropriate nonmagnetic material such as FRP. The constituent material of the jig 20 is preferably made of resin from the viewpoint of ease of molding. However, various materials such as plaster and wood are possible.

  The jig 20 also has a surface 21 (a surface overlapping the back surface of the member to be coated 10A) having a three-dimensional curved surface similar to the member to be coated 10A so that the distance from the surface to be coated is substantially constant, and a part of the jig 20 has a sheet shape. A magnet 30 is attached. The sheet-like magnet 30 is composed of a known magnet sheet, and is provided so that cut pieces 31 and 32 obtained by cutting the magnet sheet into a desired shape intersect at the center. The intersecting portion 33 is a portion where the two cut pieces 31 and 32 overlap. In addition, each cut piece 31 and 32 of a present Example is changing the shape so that an intermediate part may be wide and it will become narrow toward a front-end | tip. However, this shape is arbitrary. Further, the number of cut pieces used can be two or more.

  A magnet sheet is obtained by kneading a large number of fine magnetic particles into a molding material (base material) such as rubber, then extruding it into a sheet by calendering, etc., and magnetizing each magnetic particle. And isotropic and anisotropic depending on the orientation of the easy axis of magnetization of the magnetic particles. Among these, the anisotropic magnet sheet is obtained by aligning the easy magnetization axes of the magnetic particles in a certain direction, and a strong magnetic force can be obtained by subsequent magnetization. The isotropic magnet sheet is obtained by randomly orienting the magnetization easy axes of the magnetic particles, and the magnetic force after magnetization is relatively weak compared to the anisotropic magnet sheet. Any of the present invention can be used.

  There are also various magnetic pole arrangements of the magnetic particles magnetized on the surface of the magnet sheet, the magnetic poles of the magnetic particles are arranged linearly, and a plurality of such linear arrangements are arranged in parallel. And the like (hereinafter, referred to as a linear type) and those having a relatively low orientation in the magnetic pole arrangement of each magnetic particle (hereinafter referred to as a random type). In this embodiment, any type can be used, but the later-described changes occur in the coating result on the painted surface.

  FIG. 3 is a diagram showing the state in which the jig 20 is stacked on the back surface of the member to be coated 10 </ b> A from the back side of the jig 20. The back surface 12 of the member to be coated 10A and the back surface 22 of the jig 20 each have a concave curved surface (see FIG. 4).

FIG. 4 is a schematic cross section when the member to be coated 10A and the jig 20 are set. As shown in A, first, a cushion material 40 made of a soft elastic material such as rubber is placed on the jig 20, and The magnet sheet 30 is fixed on the surface using attachment means such as a double-sided adhesive tape 41. The member to be coated 10A is stacked on the magnet sheet 30, and the magnet sheet 30 is pressed against the back surface 12 of the member to be coated 10A.
The cushion material 40 forms a part of the jig 20. That is, the jig 20 includes a main body portion made of a rigid member and a resilient member such as the cushion member 40, and the cushion member 40, which is a resilient member, can be changed to a metal spring or the like.

As shown in B of the figure, when the edge 13 bent inward exists on the member to be coated 10 </ b> A side, by engaging the edge 23 of the jig 20 with the edge 13, the cushion material 40 is While being compressed and deformed, the magnet sheet 30 is pressed against the back surface 12 side of the member to be coated 10A by the repulsive force.
This pressing may be performed by pressing the jig 20 toward the member to be coated 10A with a strong force by a spring or the like.

  At this time, since the cushion material 40 changes following the curved surface shape on the back surface 12 of the member to be coated 10A, the entire magnet sheet 30 is pressed against the back surface 12 of the member to be coated 10A with a substantially uniform force. It can be brought into close contact with the back surface 12. For this reason, if the thickness of the member to be coated 10A is constant, the interval from the painted surface 11 to the surface of the magnet sheet 30 is made constant. Reference numeral 42 in the figure is a pin-shaped fixture, It fixes so that it may not decompose | disassemble by appropriate methods, such as penetrating a part of edge parts 13 and 23, and inserting.

  FIG. 5 shows a coating process, in which the liquid magnetic coating material 50 is applied to the surface 11 of the member to be coated 10A that has been formed smoothly in the set state of the member to be coated 10A and the jig 20 in FIG. The layer of the magnetic coating material 50 in this figure is exaggerated in size for explaining the internal structure. In the magnetic coating material 50, magnetic powder 51 is mixed, and a non-uniform orientation density is formed according to the magnetic line density of the magnet sheet 30.

  In this figure, the magnetic line density on the intersection 33 is large and the magnetic force is maximized, so that the magnetic powder 51 is concentrated most densely. Moreover, since the edge part of the cut piece 32 is also a place where a magnetic force line comes out, the magnetic force is increased and the density of the magnetic powder 51 is increased. Although not visible in the figure, the same applies to the cut piece 31. Therefore, the density of the magnetic powder 51 is larger at the edge portions of the cut pieces 31 and 32 and the portion located on the intersection 33, and the magnetic powder 51 is formed by the magnetic force change with respect to the painted surface. In a non-uniform state, it is dried and solidified to form a painted surface.

  FIG. 6 is a schematic diagram showing the painting effect of such a sheet-like magnet 30. In this figure, a random type sheet magnet 30 is cut into a strip shape, and cut pieces 31 and 32 are crossed in a cross shape.

  FIG. 7 shows a special effect portion 64 in the coating film 60, and portions of the magnetic force lines overlapping the cut pieces 31 and 32 of the coating film 60 form coating portions 61 and 62 having shapes corresponding to the respective shapes. At this time, the coating film 60 undergoes a change in the shade of the coating color, and the intersection coating portion 63 located on the intersection portion 33 is the darkest portion. In addition, contour lines 65 are formed around the coating portions 61 and 62 in correspondence with the edge portions of the cut pieces 31 and 32. The other parts are relatively light in color.

  The coating effect (change in light and shade) is a result of two cut pieces 31 and 32 intersecting the sheet-like magnet 30 and overlapping the back surface of the member to be coated 10A to cause a magnetic force change on the surface 11. As a result of strong lines of magnetic force appearing at the peripheral portions of the cut pieces 31 and 32, the peripheral portions of the coating portions 61 and 62 form a clear contour 65. Further, since the intersecting portion 33 is doubled and the magnetic lines of force are strengthened, the magnetic powder 51 is collected at a high density in the intersecting coating portion 63 so that the coating color becomes darker than the surrounding portion. That is, in the coating film 60, a special coating effect due to magnetic force occurs in a portion where the sheet magnet 30 of the member to be coated 10 </ b> A overlaps, and in particular, the peripheral portions of the two cut pieces 31 and 32 constituting the sheet magnet 30 and A remarkable magnetic force change occurs at the crossing portion, and thereby a special painting effect is generated, resulting in a special effect portion 64 in which the pattern changes in strength and shade.

8 and 9 show examples using a linearly oriented magnet sheet. In this example, as shown in a circled portion A in each figure, two cut pieces 31 and 32 obtained by cutting a magnetic sheet similar to that in FIG. 7 into a belt shape are overlapped so as to intersect at the center.
As shown in B of each figure, the linear orientation type magnet sheet has magnetic poles arranged in a plurality of parallel lines, so when used alone without overlapping, the striped pattern on the painted surface Is known to produce
Therefore, when the two cut pieces 31 and 32 intersect, a lattice-like pattern is formed at the intersecting portion 33, and a striped stripe pattern is generated at a portion other than the intersecting portion. In the intersection portion 33, a more special painting effect is produced depending on the intersection angle.

  FIG. 8 shows an example in which the orientation directions of the cut pieces 31 and 32 of the magnet sheet constituting the sheet magnet 30 are different from each other by 90 °, and the special effect part 64 is a cross-painted part as shown in a circled part B. In FIG. 63, a grid pattern is formed, and the coating portions 61 and 62 other than the cross-coating portion 63 have a stripe pattern with a difference of 90 °.

FIG. 9 shows an example in which the cut pieces 31 and 32 of the magnet sheet constituting the sheet-shaped magnet 30 are overlapped with a difference of about 45 °. As shown in a circled portion B, the cross-coating portion 63 in the special effect portion 64 is The wave lattice shape is changed to have a shape similar to a wave shape. The coating parts 61 and 62 remain a stripe pattern.
Thus, in the case of a linearly oriented type magnet sheet, it is possible to form a pattern that changes into various shapes of lattices and waveforms depending on the crossing angle.

  FIG. 10 shows an example in which a plurality of circular cut pieces (for example, three sheets of 30A, 30B, and 30C) obtained by cutting a random type magnet sheet into a circle are stacked to form a sheet-like magnet 30. Reduce the diameter from top to bottom. However, the number of stages is arbitrary. In this way, as shown in FIG. 11, the special effect part 64 of the coating film 60 forms strong concentric contour lines 66A, 66B, 66C along the contours of the cut pieces 30A, 30B, 30C.

This is because the magnetic lines of force at the outer peripheral portion of the uppermost cut piece 30C become the strongest, the contour line 66C becomes a clear and tightened strong line, and the magnetic lines of force become weaker toward the outer peripheral side with 66B and 66C. Realized by gradually changing to a blurry but thick line.
Note that when the cut pieces 30A, 30B, and 30C are stacked in reverse order, such an excellent pattern does not occur, and the whole is blurred.

The present invention is not limited to the above-described embodiments, and various modifications and applications can be made within the principle of the invention. The object of application of the present invention is not limited to a vehicle component, but may be anything as long as it is magnetically coated.
The magnetic coating material may be any of various ordinary coating materials as long as it is applied in a fluid state such as liquid and then cured by baking or drying to form a coating film.
The magnetic powder may be any iron powder or the like that can be moved or oriented by a magnetizing action and can be contained by a paint. It may be used as a pigment for paints.

Figure showing the painted product from the front side Figure showing the jig from the front side The figure which shows the jig of the state where it was piled up on the member to be painted from the back side Schematic cross section when setting the workpiece and jig Diagram showing the painting process Schematic diagram showing an example of using a belt-shaped magnet sheet Schematic showing the coating effect of the above use example Schematic showing the painting effect of other examples of belt-shaped magnet sheets Schematic diagram showing the painting effect of the use example with the crossing angle changed from FIG. Schematic diagram showing an example of using a circular magnet sheet Schematic showing the coating effect of the above use example

Explanation of symbols

10: painted product, 10A: member to be coated, 11: front surface, 12: back surface, 13: edge, 20: jig, 21: front surface, 22: back surface, 23: edge, 30: sheet magnet, 31: Cut piece, 32: Cut piece, 33: Crossing part, 50: Paint, 51: Magnetic powder, 60: Painted surface, 61: Painted part, 62: Painted part, 63: Crossed paint part, 64: Special effect part, 65: contour line, 66: contour line

Claims (4)

In a method of painting a paint containing magnetic powder on the surface with a magnet arranged on the back surface of the member to be coated,
The magnet uses a plurality of sheet magnets obtained by kneading a plurality of magnetic particles into a base material sheet and then magnetizing the magnet sheet into a predetermined shape,
Fixing the plurality of sheet magnets on the back surface of the member to be coated in a partially overlapped state,
In this state, a coating material containing magnetic powder is coated on the surface of the member to be coated. 2. The coating material containing magnetic powder according to claim 1, wherein the sheet magnet is arranged such that the magnetic poles of the magnetized magnetic particles form a plurality of parallel lines. Painting method. 2. The method for applying a coating material containing magnetic powder according to claim 1, wherein the sheet magnet has a plurality of magnetic poles of the magnetized magnetic particles arranged randomly on the entire surface. The plurality of the sheet-like magnets are arranged so as to overlap each other, and the portions where the sheet-like magnets are overlapped with each other are arranged so that the magnetic pole array directions of the respective sheet-like magnets intersect with each other. A method for applying a paint containing magnetic powder.

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