JP2000351190A - Coated resin molder product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To apply a pattern of superior three-dimensional feeling on a surface by coloring the surface in a manner of not completely masking abase having fire uneven emboss but seeing through the base and forming the walls of recessed thicker than those of projections. SOLUTION: For the purpose of forming the color different between recesses and projections, a base color of a base is not completely masked by a film of moderate masking properties, namely the base color can be seen through when a coated material is applied for shadowing recesses and projections by forming the walls of recesses thicker than those of projections. The tone of valley sections 12b is deeper visually, while the tone of crest sections 12a is slightly somber, and the variation is formed step by step all through from the crest sections 12a to the valley sections 12b on an intermediate section to form the continuous variation of the tone. Also a frosted or half-frosted transparent coating material 15 is applied overlappingly on a film 14 of a colored transparent coating material to provide the soft and quiet feeling and attractive look to match the outer appearance. Thus the shadowing of fine recesses and projections on the surface of a product is formed to provide the three- dimensional outer appearance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a resin molded product having a pattern on its surface.

[0002]

2. Description of the Related Art Conventionally, resin molded products imitating leather have been known. This is a surface having fine irregularities called a grain having a depth of about 100 μm, which is engraved on the surface of a molding die, transferred by resin molding, and formed on the surface of a molded product.

[0003] Japanese Patent Application Laid-Open No. 1-200822 discloses a technique for obtaining a tactile sensation imitating natural leather. In this technique, three layers of coating films are formed in a laminated shape on the surface of a base resin having irregularities. First, the first layer is a primer, the second layer is a two-part urethane coating film with a large elongation, so that it has a resiliency comparable to that of a natural leather mesh layer, and the third layer is a natural leather nipple layer. And a two-part urethane coating film having the same gloss and denseness and a small elongation.
Since the surface of the coating film thus laminated is uneven along the unevenness of the surface of the base material, it is said that the touch is close to that of natural leather.

However, the textured surface on which the fine irregularities of the mold are transferred by molding the resin described above has a single color tone,
Appearance is resinous (resin itself) and poor in design. In addition, the technique disclosed in the above publication is a leather pattern that is poor in three-dimensional appearance in appearance, and although the effect of improving the tactile sensation can be obtained, it touches the interior parts except for the part that is normally gripped and operated (so that a natural leather sensation is obtained). ), And the substantial effect of improving the tactile sensation is not great.

Rather, in the technique disclosed in the above publication, the emphasis is placed on the problem that the unevenness of the base material loses sharpness due to a film thickness of about 50 μm and the three-dimensional effect is reduced. Furthermore, when the third layer is made of a two-component urethane coating with a small elongation and the surface texture is made as dense as the papillary layer of natural leather, it is difficult to reproduce the feel of natural leather, and the thickness of the second layer is reduced. Even at the maximum of 70 μm, a soft feeling cannot be obtained much.

It is an object of the present invention to provide a resin molded article which has been painted under such circumstances, such as an automobile interior part having a pattern with a three-dimensional appearance.

[0007]

Means for Solving the Problems As a result of intensive studies, the present inventor has found that when forming a coating film on a base having fine irregularities on the surface, the base is colored so that the base can be seen through without being completely concealed, In addition, the inventors have found that the three-dimensional effect of the unevenness can be emphasized by forming the concave portion so as to be thicker than the convex portion, and have reached the present invention.

That is, the present invention provides (1) a base having fine irregularities formed on a surface thereof and a resin molded product having a coating formed on the surface, wherein the coating is transparent without the base being completely concealed. A resin molded article formed by a paint for coloring the base so that the concave portions of the fine irregularities are formed to be thicker than the convex portions; (3) a resin molded article coated with the coating according to the above (1) or (2), wherein the coated layer is further coated with a transparent protective coating; And (4) a resin molded article coated with the coating according to any one of (1) to (3), wherein the fine irregularities on the surface are fine irregularities imitating leather.

In the present invention, it is important to form a color difference between the concave portions and the convex portions by coloring. This color difference is formed by using a paint having a low hiding property, that is, a paint in which the base color of the base is not completely hidden by the coating film, that is, a paint in which the base color of the base can be seen through.

More specifically, the unevenness (shading) of the unevenness is given by the “flow” and “pool” of the paint due to the unevenness of the base. That is, the thickness of the concave portion is made larger than the thickness of the convex portion.
Preferably, the thickness of the recess is 2 to 8 times, more preferably 3 to 6 times the thickness of the projection. When the magnification is less than this, the density difference disappears and the three-dimensional feeling is reduced, and when it is more than this, the concave part is filled with the coating film, gradation is lost, the three-dimensional feeling is also lost, the touch feeling is also poor, the texture of leather etc. Will be impaired.

In the present invention, a color tone that is darker (darker) than the base color is selected, and when a “pool” is formed in a concave portion (valley), the concave portion is emphasized as a concave portion, and a convex portion (mountain) is formed.
The “flow” causes the concealing property to be further reduced, a color closer to the base color appears, and the unevenness has a three-dimensional appearance as a whole. The “flow” and “pool” occur on a flat place in the installation state of the product at the time of painting due to a natural flow-down action according to gravity, but also occur on an inclined surface or an upright surface with a cohesive action due to surface tension.

The paint used in the present invention is preferably a colored and transparent one. As such a coating material, for example, polyester polyol / polyisocyanate-based (two-component polyurethane coating) Senosoft II (manufactured by Cashew Co., Ltd.), acrylic resin / epoxy resin-based Micron # 3500 (manufactured by Cashew Co., Ltd.), and the like are used. be able to.

What is important in the present invention is that the thickness of the concave portion on the fine uneven surface of the molded product is larger than the thickness of the convex portion. For this reason, regarding the viscosity of the paint, a range of good fluidity, for example, when using an acrylic resin / epoxy resin type micron # 3500, the base agent and the thinner are blended in a ratio of 2: 1 to 2: 4, and the viscosity is determined by an Iwata viscosity cup. 8 ~ with NK-2 type (manufactured by Anest Iwata Co., Ltd.)
Those having a range of 15 seconds, preferably 9 to 11 seconds (20 ° C.) are used. The fluidity can be adjusted by adjusting the blending amount of the thinner. The drying rate can be controlled by adjusting the components of the thinner such as replacing the low-boiling solvent with a high-boiling solvent so that the drying rate does not become too high.

As described above, when the surface of a molded article is usually coated, the coating is performed so as to have a uniform film thickness and to speed up the drying of the coating film. The coating is performed under such conditions that the film is not uniform and does not dry too quickly.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a vehicle interior part according to an embodiment of the present invention.

FIG. 1 shows a glove box outer 10 as an example of an automobile interior part, which covers a body-facing surface of a glove box 2 provided on the instrument panel 1 shown in FIG. There is a recess 11 for the lock 3,
A grain 12 (depth of 80 μm, for example, Bearron # 535 grain) imitating leather is applied to the entire surface, and is formed by, for example, injection molding a beige colored ABS resin pellet.

Further, this glove box outer is spray-coated with an acrylic resin / epoxy resin-based colored transparent paint (color clear) [Micron # 3500 manufactured by Cashew Co., Ltd.].

FIG. 3 is a partial cross-sectional perspective view showing a state in which a color clear coat of 16.5 g per m ² is applied, and the coating film 14 is approximately 5 μm on the top 12 a of the grain 12.
A film thickness of about 20 μm is formed in the second valley portion 12b, and the color clear is darker than beige.
For example, the color is amber, and is dark at the valley portion 12b.
The top portion 12a is thin so that the beige color of the base material as a whole can be seen through.

That is, as schematically shown in FIG.
The valley portion 12b is visually deeper, the top portion 12a has a slightly duller color tone of the automotive interior part (base material), and the middle portion between the ridge portion 12a and the valley portion 12b.
A gradation (gradual change) is formed during the process, which is a very continuous color change due to "flow" and "pool", so that grain emulating natural leather is effectively emphasized and three-dimensional It looks like.

FIG. 4 is a diagram in which a matte transparent paint 15 is further applied on a colored transparent paint coat 14, and the matte transparent paint 15 has a high elongation and a good resilience. Senosoft II Cashew Co., Ltd.) is used. This matte transparent paint 15 is mat (matte),
Semi-matte (semi-matte) is preferable, and a soft and moist feel and appearance can be obtained, which can match the appearance.

The above surface structure of the present invention can be applied to various molded products, and is particularly suitable for interior parts for automobiles. For example, other than glove box outer, pillar garnish,
It can be used for storage case lids such as coin cases and console boxes, as well as driver-side airbag covers that are injection molded with elastomer, and passenger-side airbag covers that are integrally molded with the instrument panel upper garnish. Materials are ABS resin and elastomer resin, as well as various nylon and PE depending on the application.
T, PBT, vinyl chloride, polypropylene, polystyrene, polyphenylene ether resin, polyacetal,
Unsaturated polyester or the like can be used, and depending on the properties of the resin, for example, in the case of polypropylene or the like, the primer may be coated with a chlorinated polyolefin or the like, and then the transparent paint may be coated.

The above description has been made based on the coating method using a single-head type spray gun (one-nozzle type spray gun). Can be added. The two-head gun here is a spray gun that can simultaneously spray two kinds of paints with a single paint. Each independent two paint supply lines and the spray connected to each paint supply line. The nozzle is connected to a compressed air supply line capable of appropriately adjusting the air pressure, and can spray a paint of a predetermined amount, speed, density, or particle size by grasping a trigger. For example, as shown in FIG. 5, one nozzle sprays fine mist-like paint particles of a light colored transparent paint 16 and the other nozzle sprays a slightly darker colored transparent paint 17. A relatively large droplet is sprayed and mixed with each other while reaching or after reaching the surface of the automobile interior part, which is the object to be coated, to form a shaded pattern with two types of color clear. This becomes darker at the valley portion 12b and becomes lighter at the top portion 12a according to the unevenness of the grain, and the adjacent valley portions 12b, 12b,
A slightly different color tone is obtained between each of a and 12a, and natural “messyness” can be created. Thereby, it is possible to give a natural appearance different from an artificial thing which is common in resin molded articles.

The above is an embodiment in the case where the surface pattern is leather grain, but the surface pattern is not limited to this leather grain, and may be a grained grain, a straight grain, a ball-shaped grain such as a rose or a zelkova pattern, or the like. It is also possible to apply the present invention to a fine concave pattern such as Lauan and a fiber pattern imitating a carbon composite.

[0024]

As described above, according to the present invention,
The color tone of the valleys of the fine irregularities on the product surface can be made darker, and the shade of the top part can be easily made lighter and lighter, and unlike resin molded products with only fine irregularities, the fine irregularities are emphasized, Appearance can be obtained, and natural materials can be more naturally complemented.

[Brief description of the drawings]

FIG. 1 is a perspective view of a glove box outer according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a glove box outer inside an automobile.

FIG. 3 is a partial cross-sectional perspective view of a glove box outer having a coating film structure of the present invention (surface 20 times enlarged).

FIG. 4 is an explanatory view of a surface coating structure in the case where a colored transparent paint is coated and then a matte transparent paint is further coated.

FIG. 5 is an explanatory diagram of a coating film structure when a pattern made of two types of colored transparent paints is formed using a two-head gun.

Continued on front page F-term (reference) 4D075 CB21 DA07 DC13 4F055 AA21 BA19 CA03 DA02 GA01 4F100 AT00A BA03 BA07 BA10C BA41 CC00B CC00C DD01 DD01A DD01B EH61 HB22 HB22B HB26 HB26B JN01C JN30

Claims (4)

[Claims] 1. A base having fine irregularities formed on the surface and a resin molded article having a coating applied to the surface, wherein the coating is colored so that the base can be seen through without being completely concealed. A resin molded article which is formed of a paint and has a coating in which the concave portions of the fine irregularities are formed thicker than the convex portions. 2. The coated resin molded article according to claim 1, wherein said coating film has a lower brightness than a color tone of a base. 3. The coated resin molded article according to claim 1, wherein said coating film is further coated with a transparent protective coating film. 4. The resin molded article according to claim 1, wherein the fine irregularities on the surface are fine irregularities imitating leather.