JPS60155456A - Coating method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] Skin Tip I This invention relates to an improvement in a coating method by pasting a paint film as a form of coating method, and relates to a method for producing a strong, durable and beautiful coating film quickly and with good operability. .

11 Painting As a form of surface treatment by painting for various techniques, there is a method in which a paint film is formed in advance and then applied to a substrate. The purpose of this method is to make the process more or less dry compared to the conventional wet method, which involves applying and drying or curing a paint solution, to improve operability, and to quickly form a relatively thick paint film. This is the method that is adopted. The following are the main methods for forming paint films that have been adopted or proposed for this purpose:
(a) Non-woven fabric impregnation method: A non-woven fabric of about 15 to 30 g/l is impregnated with a thermosetting resin in a solution state and dried to form a paint film (generally referred to as "overlay paper").

(b) Non-woven fabric coating method: A thermosetting resin is applied in powder form to a non-woven fabric weighing approximately 15 to 30 g and 10 f, and after hot melting, it is cooled to form a paint film.

(C) Film coating method: A transferable film is created by applying a soft thermoplastic resin or thermosetting resin liquid to a releasable film such as a polyester film (generally referred to as "hot stamping"). ).

(d) Paint sheet method with adhesive: A coating film is prepared in advance and an adhesive is applied to the film to form a film (stick-on coating method).

However, each of the coating methods in which the paint film obtained as described above is applied to a substrate has several disadvantages. That is, the above (a) and (b)
) In the case of (&), the coating film is sticky and difficult to handle due to the use of non-woven fabric, which results in poor transparency and poor defoaming properties. In the case of C), the solid coating film formed on the releasable film is brittle if it is a thermoplastic resin, or brittle if it is a thermosetting resin.
It is not easy to handle due to residual stickiness, and (d)
In this case, the coating film is bonded with a pressure-sensitive adhesive that has weak adhesive strength, so it is also not possible to provide a coating film with good durability.

This invention eliminates the drawbacks of the above-mentioned coating method in which a paint film is formed in advance and is applied to a substrate, and forms a paint film that is easy to handle, and using the same,
The main objective is to provide a method for providing durable coatings.

The coating method of the present invention was developed to achieve the above-mentioned object, and more specifically, it is characterized by including the following steps.

(B) Forming a pressure-sensitive adhesive layer on the temporary support film; (B) Spreading thermosetting solid paint powder onto the pressure-sensitive adhesive layer; (C) Said thermosetting solid. A step of heating the paint powder to fuse it to the phase π, (d) applying the laminate film obtained in (a) to (c) above to the substrate via the thermosetting solid paint powder fusing layer; A step of laminating the product on top and heating and pressurizing the whole to integrate it, and (e) a step of peeling and removing the releasable film from the integrated product.

The coating method of the present invention can be said to be similar to the film coating method (C) of the prior art described above in that a paint layer previously formed on a temporary support film is transferred to a base material. However, in method 1-(C), since the paint itself has film-forming properties, the durability of the resulting paint film decreases or the handling property decreases due to residual stickiness. On the other hand, in this invention, since the pressure-sensitive adhesive is responsible for the woody part of coating film formation on the temporary support film, the coating itself has sufficient solidity to be handled. It is now possible to use thermosetting resins that can provide a durable coating upon curing.
The above objectives are achieved.

1. , ff+ Typical embodiments of the coating method of the present invention will be described with reference to the accompanying drawings.

According to the method of this invention, first, as shown in FIG. After spraying the thermosetting paint powder, the powder is heated and fused together to form the thermosetting solid paint powder fused layer 3.

As the temporary support film l, for example, a film made of polyester, polyethylene, polypropylene, vinylon, fluororesin, etc. and having a thickness of about lθ to 2004 m is suitably used, but as long as it has appropriate smoothness and flexibility, paper, paper, etc. Any film or sheet material can be used, such as metal foil.

The pressure-sensitive adhesive layer 2 is used to support the thermosetting paint powder sprinkled thereon and to help form the layer.As the pressure-sensitive adhesive, a commonly used rubber-based adhesive is used. Adhesives can be suitably used. The thickness of the pressure-sensitive adhesive WI2 is not particularly limited as long as the above objective can be achieved, but a range of 10 to 100 g/- is generally preferably used.

The thermosetting solid paint constituting layer 3 is mainly composed of thermosetting resins that are solid at room temperature and easily powdered, such as epoxy resins, polyester resins, acrylic resins, or mixtures thereof. A suitable amount of coloring agent is added to this. The solid paint fusing layer 3 is made by applying the powder of the paint mainly composed of these thermosetting resins at a rate of, for example, 100 to 200 g/d depending on the required coating thickness. It can be obtained by scattering it on the pressure-sensitive adhesive layer 2 and heating it to about 90 to 110°C depending on the resin used. At this time, in order to help form the layer 3 uniformly, it is preferable to heat the layer 3 while pressing it with a material having a releasable surface, such as a polyester film. Without this heat fusing step, only one layer of the thermosetting paint powder would be retained on the pressure sensitive adhesive layer 2, but by heat fusing, multiple layers of paint powder would be retained. This ensures that the required coating thickness is maintained.

The above-described coating powder spraying and heat-fusion steps can be repeated as necessary.

The thus obtained laminate film 10 having the thermosetting solid paint fusing layer 3 as shown in FIG. 1 is laminated with a base material 20 of any material via the solid paint fusing layer 3. As a preferable example of the base material, for example, as shown in FIG.
/C plywood, P/B plywood, metal plate, inorganic board, or other arbitrary material base plate 4, decorative board such as natural wood board, artificial wood grain board, printing decorative material 1 Colored synthetic resin sheet pasting decoration. An example is a wood base material 20 to which a wood decorative material 30 such as wood is attached.

The laminate of the laminate film 10 and the base material is heated to a temperature suitable for curing the thermosetting paint 3, for example 130 to 150°C.
By maintaining the paint under a pressure of 5 to 20 kg/kg, the paint 3 is cured and the whole is integrated (Fig. 3).

At this time, it is also a preferable embodiment to use a laminated adhesive of wood thin pieces as the substrate 20 and simultaneously cure the laminated adhesive to form a plywood at the time of heating and pressurizing for curing the paint 3.

Next, when the temporary support sheet 1 is peeled off from the laminate, the temporary support sheet 1 may be separated from the temporary support sheet 1 alone or generally by collective failure in the pressure-sensitive adhesive layer 2 as shown in FIG. 1 and a part of the pressure sensitive adhesive 2 will peel off.

Further, the remaining pressure-sensitive adhesive is removed by mechanical grinding or wiping with a solvent, if necessary, or an appropriate top coat 6 is applied, to obtain the coated material according to the present invention, as shown in FIG. It will be done.

As mentioned above, in this invention, a thermosetting paint powder is sprinkled onto a temporary support film via a pressure-sensitive adhesive layer, and after fusing this paint powder, it is transferred to a base material and cured. Employing bonding provides a coating method that uses a solid paint film that is easy to handle, yet provides a durable coating. The method of the invention is particularly suitable for providing relatively thick and robust basecoat coatings.

Hereinafter, the present invention will be explained in more detail with reference to Examples. In the following description, all "parts" mean "parts by weight."

1 cliff l In substantially the manner as described in FIGS. 1 to 5,
The coating method of this invention was carried out.

That is, a polyester film with a thickness of 50 gm was used as the temporary support film 1, and a rubber pressure-sensitive adhesive (Konishi GPX-2) was applied thereon at a rate of 50 g/g.
After drying at 5°C for 1 hour, an epoxy resin (Epiclon NN-680 manufactured by Dainippon Ink) was applied onto the pressure-sensitive adhesive.
) loo and the same curing agent (Imidazole 2 manufactured by Shikoku Kasei)
An epoxy paint powder having a composition of 5 parts (E4ME) and consisting of particles of less than 100 mesh was spread at a rate of 200 g/m'', held at 100°C for 2 minutes, and temporarily supported as shown in Figure 1. A laminate film 10 which was easy to handle and had a paint fusing layer 3 that adhered well to the body film 1 was obtained.

Next, this laminate film was laminated via the paint fusing layer 3 on a 10 mm thick R/C plywood board 7 to which a 0.5 mm thick American walnut decorative plywood was pasted.
Heating at 30°0, 10kg/crrI, 10 minutes,
Pressurized. The polyester film was easily peeled off from the resulting laminate, along with a portion of the pressure-sensitive adhesive. Furthermore, when the remaining pressure-sensitive adhesive was removed from this laminate by paper grinding, a hardened paint layer was formed that firmly adhered to the base material, and by further applying urethane clear paint, painted plywood with a smooth and beautiful appearance was created. was gotten.

[Brief explanation of the drawing]

1 to 5 are schematic cross-sectional views in the thickness direction of each material for explaining typical process combinations of the coating method of the present invention. l... Temporary support film 2, φ pressure sensitive adhesive layer 3... Thermosetting solid paint powder fusion layer (3a... layer after curing under heat and pressure) 4... Base plate 5φ, decorative material Layer 6: Top coat layer 10: Laminated film 20: Base material

Claims (1)

[Claims] 1. A coating method characterized by including the following steps. (b) Forming a pressure-sensitive adhesive layer on the temporary support film; (b) Spreading thermosetting solid paint powder onto the pressure-sensitive adhesive layer; (c) Said thermosetting solid paint. a step of heating the powders to fuse them together; (d) laminating the laminate film obtained in (a) to (c) above on Kanmura through the thermosetting solid paint powder fusing layer; and (e) a step of peeling and removing the releasable film from the integrated product. ? The coating method according to claim 1, wherein said step (c) is performed under pressure. 3. The coating method according to claim 1 or 2, wherein the base material is wood. 4. The coating method according to claim 3, wherein the temperamental base material is a laminated adhesive of wood flakes, and the integral curing of these wood flake laminates is also achieved during the integration by heating and pressing.