JPH0642155U - Painted melamine decorative board and parts with painted melamine decorative board - Google Patents

Abstract

(57) [Summary] [Purpose] Painted melamine decorative board with improved adhesion of synthetic resin paints, reinforcement effect of coating film, and excellent sharpness of film, feeling of film thickness, smoothness and gloss. And a painted melamine decorative board pasting member. [Structure] A coating layer of a synthetic resin coating material 3 is formed on a surface of a melamine decorative board 1 via a coating layer of an undercoating agent 2 having excellent adhesion.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a melamine decorative board with a paint finish and a melamine decorative board pasting member used as a surface material for furniture, housing equipment, office equipment and the like.

[0002]

[Prior art]

 Conventionally, when a melamine decorative board is coated, the adhesion between the melamine decorative board and the paint is inferior.Therefore, in most general applications, the melamine decorative board is directly coated on the base material without being coated. Was there.

Also, a feeling of film thickness on the surface. Due to the demands on texture, such as ultra-gloss finish, when used in particular after coating, the surface of the melamine decorative board was polished with abrasive paper or steel wool, and then the coating was applied, but the adhesion of the coating was It wasn't enough.

[0004]

[Problems to be solved by the device]

 Since the melamine decorative board has a hard surface, it is resistant to scratches and abrasion, and has excellent heat resistance and stain resistance. In addition, since it has high strength, rigidity, and has a good appearance after being stuck, it is generally used by directly sticking it to a substrate.

However, when a particularly high degree of texture and design is required, the feeling of coating film on the surface is poor, and as a material constitution, α-cellulose paper in which a melamine resin is further impregnated on a pattern layer on which a pattern is printed is used. Since there is a layer, that is, an overlay layer, there is a problem that the definition is slightly lowered in the representation of the pattern.

In addition, although it is possible to achieve a glossy finish to some extent, it is difficult to obtain a super glossy decorative surface because irregularities on the surface of the substrate to be laminated and unevenness of the texture of the paper that is the material appear on the surface. It was

In order to improve the texture of the surface, when the coating is applied, the adhesion between the melamine decorative board and the synthetic resin coating is poor, so the surface must be sufficiently polished, but the surface is hard and evenly polished. It was difficult to do so, and defects such as edge sagging due to excessive polishing, wear of the pattern, and generation of unpolished parts were likely to occur.

The present invention improves the adhesion of synthetic resin paints by providing an undercoat layer made of acrylic polyol and non-yellowing isocyanate between the surface of the melamine decorative board and the coating surface of the synthetic resin paint. However, a coating-finished melamine decorative board and a coating-finished melamine decorative member having excellent pattern definition, film thickness, smoothness, and gloss, as well as the effect of reinforcing the coating film are provided.

[0009]

[Means for Solving the Problems]

 Coating characterized in that a layer of an undercoating agent containing acrylic polyol and non-yellowing type isocyanate as main components is formed on the surface of the melamine decorative board, and a synthetic resin coating is applied on the undercoating agent layer. Finished melamine decorative board and painted finish This is a member for applying a melamine decorative board. Hereinafter, a detailed description will be given with reference to FIGS. 1 and 2.

In the present invention, since the coating film is formed on the surface of the melamine decorative board 1, the structure of the overlay layer of the melamine decorative board 1 is not necessary. Further, surface polishing for improving the adhesiveness of the coating film is not particularly required, and the surface of the melamine decorative plate 1 can be directly coated.

After cleaning the surface of the melamine decorative board 1 with a solvent or the like, a solution of an undercoating agent 2 containing acrylic polyol and a non-yellowing type isocyanate as a main component is applied and dried and cured. 2. Polish the coated surface of 2.

The acrylic polyol constituting the undercoat material is a hydroxyl group-containing polyacrylate such as methyl methacrylate and hydroxyethyl methacrylate copolymer, and the non-yellowing type polyisocyanate is an aliphatic type or alicyclic type. The system isocyanates and their biurets, adducts, isocyanates, block isocyanates, prepolymers and the like have an action as a crosslinking curing agent.

As the acrylic polyol and the non-yellowing type polyisocyanate, it is desirable to use those dissolved in an organic solvent such as toluene and mix them just before use.

Next, a synthetic resin coating 3 of polyester resin type, acrylic resin type, polyurethane type or the like is applied at least once.

The synthetic resin coating material 3 can be cured by room temperature curing, heat curing, ultraviolet curing, or the like.

For a member such as a post-form member, by applying the melamine decorative board 1 to the base material 4 and then applying the undercoating agent 2 and the synthetic resin paint 3, defects such as slight scratches generated during the process are applied. Since it is not covered with a film, it becomes inconspicuous.

[0017]

【Example】

 Example 1 A grain pattern having a thickness of 20 mm, a width of 450 mm, and a length of 600 mm, and having both ends in the longitudinal direction processed into semicircular curved surfaces, has a wood grain pattern thickness of 0.8 mm without an overlay layer on the surface of the particle board substrate. Wipe the surface of the melamine decorative board of a so-called post-form processed panel with the melamine decorative board laminated on one side including the curved surface with a cloth containing methanol to remove dirt and attached oils and fats.

Next, a 35% acrylic polyol solution, a 56% non-yellowing type isocyanate solution and a thinner were adjusted to a weight ratio of 8: 1: 5 with a spray gun. The coating amount is 70 to 80 g / m ^{2, and} the coating is left for 24 hours to cure.

Next, this coated surface of the undercoating agent is lightly abraded with a water-resistant abrasive paper of AA240 defined in JIS R6253.

Next, a polyester-based intermediate coating material containing methyl ethyl ketone peroxide, a curing accelerator, and cobalt naphthenate as a curing agent was applied to the ground coating film surface of the polished undercoating agent at a thickness of 350 μm. After allowing to stand for 5 hours at this temperature to cure, the surface is smoothed by sequentially polishing with water resistant abrasive paper of AA80, AA400 and AA600.

Next, an ultraviolet-curable acrylic clear coating material is applied as a top coat by a flow coater so as to have a weight of 100 to 120 g / m ² , and is irradiated and cured by an ultraviolet curing device at an irradiation amount of 80 W / cm ² for 5 seconds. A coated melamine decorative board pasting member for furniture doors was obtained.

The coating-finished melamine decorative board-attached member had a good adhesion of the coating film and was rich in wall thickness. In addition, a uniform super-gloss finish was achieved and a Class A smoothness was obtained.

[0023]

[Effect of device]

 Main component is acrylic polyol and non-yellowing type isocyanate, which has a high affinity for the melamine decorative board and synthetic resin paint between the surface of the melamine decorative board and the coating film of synthetic resin paint and has good adhesion. By forming the undercoat layer, it is possible to coat a melamine decorative board, which has been difficult in the past.

In the paint-finished melamine decorative board of the present invention, the synthetic resin coating film is firmly adhered to the surface of the decorative board through the undercoating agent, so it is hard to peel off against external force such as impact, and the durability is improved. . Since the melamine decorative board and the coating film of the synthetic resin coating are laminated, a composite structure is added, so that the hardness and strength of the melamine decorative board are added, and the reinforcing effect makes the coating film less likely to be destroyed. In general, when the coating film is thin, the practical hardness of the coating film may decrease due to the influence of the base, but in the present invention using the melamine decorative board as the base, such practical hardness does not decrease.

Since the surface polishing step of the melamine decorative board is not required, there is an effect of labor saving, and there is no risk of damage to the pattern due to excessive cutting and unevenness of adhesion of the coating film due to uneven polishing. In addition, the overlay layer, which is a constituent material of the surface of the melamine decorative board, is not required, and it is possible to clearly express the pattern and color. Furthermore, by coloring the coating film, the image of the design can be changed.

Since the melamine decorative board is harder and more rigid than other decorative materials, when it is attached to a base material, it is difficult for unevenness of the base material surface to appear on the surface. Synthetic resin A coating layer of paint is formed, so the synergistic effect provides an appearance with a high degree of design. Moreover, since the melamine decorative board suppresses the movement of the structure of the base material, the smoothness and gloss do not deteriorate during long-term use.

[Brief description of drawings]

FIG. 1 is a sectional view showing a part of a painted melamine decorative board of the present invention.

FIG. 2 is a cross-sectional view showing a structure of a paint-finished melamine decorative board attaching member of the present invention.

[Explanation of symbols]

 1 Melamine decorative board 2 Undercoat material 3 Synthetic resin paint 4 Base material

Claims (2)

[Scope of utility model registration request] 1. A layer of an undercoating agent containing an acrylic polyol and a non-yellowing type isocyanate as main components is formed on the surface of a melamine decorative board, and a synthetic resin coating is applied on the layer of the undercoating agent. Characteristic painted finish melamine decorative board. 2. A layer of an undercoating agent containing an acrylic polyol and a non-yellowing type isocyanate as main components is formed on the surface of a melamine decorative board adhered to a substrate, and a synthetic resin coating is formed on the undercoating agent layer. A paint-finished melamine decorative board pasting member characterized by being coated with.