JPH0737862Y2 - Painted wooden articles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a wooden article having a painted surface.

[Conventional technology]

Wooden articles, more specifically, wooden articles such as those used for interiors of automobiles and buildings, are generally used by applying a coating on the body of natural wood. The paint used for this painting is generally a paint based on a synthetic resin, and a polyester resin paint is one of them. When a polyester resin is used as a paint for natural wood, a polyurethane resin paint is used as an undercoat paint to prevent the polyester resin from being adversely affected by the resin content of wood.

[Problems to be solved by the device]

Prior art coated wood articles as described above, namely wood articles consisting of a natural wood core, a polyurethane resin paint primer on the core, and a polyester resin paint overcoat on the primer, have the following: There was such a drawback. That is, the undercoating of the polyurethane resin coating is apt to yellow, as is customary for polyurethane resins, which impairs the aesthetics of wooden articles. If a non-yellowing type polyurethane resin paint is used to avoid this drawback, the difference in the degree of heat shrinkage between the undercoating film and the topcoating film of the polyester resin paint becomes large, and therefore the adhesion between the coating films Deteriorates and peeling of the coating film occurs. Therefore, such prior art painted wooden articles were unavoidable for yellowing of the primer polyurethane resin or peeling of the coating.

In order to solve the above-mentioned drawbacks of the prior art, the present invention prevents the yellowing of the polyurethane resin paint and ensures the adhesion between the polyester resin coating film and the polyurethane resin coating film, such as the interior of automobiles. It is an object to provide a painted wooden article suitable for use in a car.

[Means for Solving the Problems]

The coated wood article of the present invention has a coating film of a polyurethane resin paint containing a non-yellowing polyisocyanate and an acrylic polyol on a wooden core material, and the non-yellowing polyisocyanate and Having a coating film of a polyurethane resin paint containing a polyester polyol,
Further, a polyester resin coating film is further provided on this coating film.

The wood core material which is the main body of the painted wooden article of the present invention may be a natural wood veneer or plywood, or may be a flat plate, or may be molded to have a desired surface shape. Good. Further, the core material may be a laminate of natural wood having a veneer of natural wood on the surface and another material.

The polyurethane resin paint forming the undercoat on the wood core may be a non-yellowing type polyurethane resin paint used in the undercoat of prior art painted wooden articles. Such a paint is generally a two-pack type polyurethane resin paint containing an acrylic polyol and a non-yellowing polyisocyanate curing agent as main components. The thickness of this coating is generally
It is 0.01 to 0.02 mm.

When the polyester resin paint is directly overcoated on the above-mentioned undercoating film of the polyurethane resin paint, the adhesion between the undercoating film and the overcoating film is deteriorated, resulting in peeling of the overcoating film. Therefore, the coated wooden article of the present invention has a coating film of a non-yellowing type polyurethane resin paint containing a non-yellowing polyisocyanate and a polyester polyol on the coating film of the polyurethane resin paint. Since this paint contains a highly flexible polyester-based polyol, the difference in the degree of heat shrinkage with the coating film of the polyester resin to be overcoated is smaller than that of other paints, and it is possible to prevent misalignment. Adhesion can be obtained. Further, since this paint is of the same kind as the undercoating non-yellowing modified polyurethane resin paint, the adhesion to it is also good. This kind of non-yellowing type polyurethane resin paint is also generally supplied commercially as a two-pack type paint. The thickness of this coating is generally 0.01 to 0.02 mm.

The coated wooden article of the present invention has a coating film of polyester resin coating on the polyurethane resin coating film of the yellowing resistant type. This polyester resin paint may be the one usually used in conventional products.

The coated wood article of the present invention can be manufactured as described below. That is, first, a suitable wood core material is prepared, and a polyurethane resin coating material containing a non-yellowing polyisocyanate and an acrylic polyol is undercoated on the surface thereof. To apply this paint, a normal spray or the like can be used. The paint is dried and cured after application. Next, a polyurethane resin coating material containing a non-yellowing polyisocyanate and a polyester polyol is applied onto this undercoat coating film. This paint can be applied using conventional air spray, electrostatic coating, etc., and is dried and cured after application. A polyester resin paint is applied on the coating film thus obtained. As a coating method, spray coating, electrostatic coating or the like can be used. After application of the polyester resin coating, this application is dried. The thickness of the polyester resin coating film is 0.2 to 0.7 mm.

[Action]

The coated wooden article of the present invention comprises a polyester resin coating as an undercoat, a coating of a non-yellowing type polyurethane resin coating on a wooden core material, and a coating of a non-yellowing type polyurethane resin coating on this coating. Since these coatings have the property of resisting yellowing by light, these coatings impart yellowing resistance to the coated wood articles of the present invention. In addition, a polyurethane resin coating film containing a polyester polyol having high flexibility as a main component between the top coating film of the polyester resin coating material and the undercoat coating film of the non-yellowing type polyurethane resin coating material on the wooden core material. By the presence of the above, sufficient adhesion can be obtained to both the coating film of the polyester resin thereabove and the coating film of the polyurethane resin therebelow.

〔Example〕

Next, the painted wooden article of the present invention will be further described with reference to the drawings.

FIG. 1 shows a coated wooden article 1 of the present invention, which uses a natural wood veneer as a core material. A sectional view taken along line II-II of this figure is shown in FIG.
In FIG. 2, 2 is a core material, that is, a single plate of natural wood, and 3 is a coating film portion. In order to show this coating film portion in more detail, the portion A in FIG. 2 is enlarged and shown in FIG.

In FIG. 3, a coating film 4 of a non-yellowing type polyurethane resin paint containing a non-yellowing polyisocyanate and an acrylic polyol is present on the core material 2. This coating film is a coating film having a thickness of 0.01 to 0.02 mm obtained by applying it using an air spray, drying and curing it.
On the coating film 4 is a coating film 5 of a polyurethane resin coating of a yellowing resistant type containing a non-yellowing polyisocyanate and a polyester polyol. This coating film is also a coating film having a thickness of 0.01 to 0.02 mm obtained by applying by air spray, drying and curing. Further on the coating film 5 is a normal polyester resin coating applied by spraying or the like and dried to have a thickness of 0.5 mm.
Is the top coating film 6.

In FIG. 2, the difference in the thickness of the coated wooden article of the present invention between the upper surface, the side surface and the lower surface is simply due to the difference in the thickness of the polyester coating film. The polyester coating on the upper surface, which is the front surface of this article, is thicker than that on the other surfaces when it is used, because it corresponds to the stress change of the wood part, and there is a possibility of contact with human hands. Because there is.

[Effect of device]

In the coated wooden article of the present invention, the undercoat layer existing between the wood core material and the top coating film of the polyester resin coating is a coating film of the non-yellowing type polyurethane resin coating on the core material,
On top of this coating, it consists of another polyurethane resin coating of the yellowing type that is in contact with the top coating of polyester resin coating, which prevents the yellowing of the polyurethane coating due to light. . In addition, the coating film of the non-yellowing type polyurethane resin paint whose main component is a polyester polyol sandwiched between the coating film of the polyester resin paint and the coating film of the non-yellowing type polyurethane resin paint,
The difference in the degree of heat shrinkage with the coating film of the polyester resin paint is small, and there is no deviation, so the adhesion with it is good, and because it is similar to the other non-yellowing type polyurethane resin paint, Adhesion is also good. Therefore, in the coated wooden article of the present invention, the effect of preventing the yellowing of the polyurethane resin coating film and the effect of ensuring the adhesion between the polyester resin coating film and the polyurethane resin coating film are simultaneously exhibited.

[Brief description of drawings]

FIG. 1 is a perspective view of a painted wooden article of the present invention, and FIG.
II-II sectional view of the painted wooden article shown in Fig. 3, Fig. 3 is A of Fig. 2
It is an expanded sectional view of a part. In the figure, 1 is a painted wooden article, 2 is a core material, 3 is a coating film portion, 4 is a non-yellowing type polyurethane coating film, 5 is a non-yellowing type polyurethane coating film, and 6 is a polyester coating film.

 ─────────────────────────────────────────────────── --- Continuation of the front page (56) References JP-A-48-88124 (JP, A) JP-A-57-189847 (JP, A) JP-A 1-299031 (JP, A) Practical application Sho-63- 124128 (JP, U) Polyurethane resin handbook edited by Keiji Iwata P. 406, 410, 411 Published by Nikkan Kogyo Shimbun on September 25, 1987

Claims (1)

[Scope of utility model registration request] 1. A coating film of a polyurethane resin paint comprising a yellow-colored non-modified polyisocyanate and an acrylic polyol on a wood-based core material, and the yellow-colored modified polyisocyanate and the polyester-based polyol are formed on the coating film. A coated wood article, characterized by having a coating film of a polyurethane resin paint, which comprises: and a coating film of a polyester resin paint on the coating film.