JPS6034466B2 - Decorative material manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a decorative material having a cured coating surface by electron beam irradiation. The present invention provides a method for producing a decorative material, which is characterized in that surface properties can be arbitrarily adjusted by eliminating surface characteristics.

Decorative materials with a cured coating surface have many demands,
It is produced by various coating film curing methods, including heat curing, photocuring, and electron beam curing. The present invention is made of wood or
To form an electron beam-cured coating film on the surface of an inorganic substrate, apply an electron beam-curable paint to the surface to which patterned decorative paper has been pasted in advance using an emulsion type or solvent-based adhesive, and apply the paint. After applying an air-blocking film to the surface, the coating layer is cured by electron beam irradiation, and then the adhered film is peeled off to create a uniform surface coating with high hardness and relatively flexibility. An impact-resistant decorative material is obtained by laminating the decorative paper on the base material surface via a decorative paper adhesive layer having the following properties. Conventionally, in the coating hardening method using electron beam irradiation, in air, the polymerization and crosslinking reaction of the paint by oxygen radicals is suppressed, resulting in poor curing, so it is necessary to carry out in an inert gas atmosphere such as nitrogen. Nitrogen gas is always fed evenly to keep the oxygen concentration below about 600 PPM, but in the case of decorative materials that have a large area, even if you adjust the nitrogen gas air volume and the placement of the blowing port, it will spread over the entire surface. It is extremely difficult to maintain a uniform atmosphere, and it is difficult to obtain uniformity on the cured surface, resulting in the problem that uneven gloss tends to occur.

Moreover, the increase in production costs due to nitrogen gas injection has an unavoidable disadvantage. The object of the present invention is to obtain a decorative material with excellent surface properties, including solving the above-mentioned disadvantages.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of a cross section of a decorative material immediately before electron beam irradiation in the present invention, and 1 is a base material such as plywood, particle board, gypsum board, calcium citrate board, etc.

2 is emulsion type adhesive such as vinyl acetate type, solvent type adhesive such as epoxy type, electron beam curing of epoxy acrylate, trimethylolpropane trimethacrylate, tetramethylolmethanetetramethacrylate, neobentyl glycol diacrylate etc. 3 is a decorative paper with a pattern formed with printing ink 3a; when the decorative paper 3 is bonded to the base material 1 with an adhesive 2, and the adhesive 2 is an emulsion type or a solvent type, After the dispersed soot and solvent are removed by heating etc., on the top surface,
The electron beam curable paint 4 is applied by curtain coating, roll coating, or the like.

The electron beam curable paint 4 is made of unsaturated polyester, polyester acrylate, urethane acrylate, epoxy acrylate, polyether acrylate, melamine acrylate, etc. Following the application of the paint, a film 5 is applied and lightly squeezed with a roller. By doing so, the adhesive is pasted without entrapping air, resulting in the state shown in the first figure.
As the film 5, a film is selected that is inert to the electron beam curing paint used and has air barrier properties.
Synthetic resin films such as polyester, polypropylene, and vinylon, cellulose films (cellophane), and aluminum foils are suitable. The laminate in the state shown in the first diagram is then
Electron beam irradiation is performed in an air atmosphere to form an electron beam curing type paint 4.
Let the layer harden. Since the film 5 blocks oxygen in the air, there is no need for an inert gas atmosphere as in the conventional case, and if the film 5 is peeled off after curing as shown by the dotted chain line 5', the cured painted surface becomes a film. The surface condition of film 5 is transferred as is, and by selecting the film 5, any surface condition such as gloss, matte or uneven pattern can be obtained.
The film 5 can also serve as a surface protection material during the product distribution stage. Specific examples of the manufacturing method of the present invention will be shown below.

Example A vinyl acetate-based emulsion adhesive (solid content 50%) was applied uniformly to the surface of particle board at a rate of 90%, and then a pattern was printed with acrylic ink at a rate of 23%/force. After laminating and pressing the decorative paper, 10500,
After heat treatment for 1 minute, polyester acrylate was coated on the top surface by curtain coating method every 60 minutes, a polyester film with a thickness of 50 mm was applied to the surface, and after degassing by roller pressure bonding, electronic Line irradiation was performed using an accelerator under the conditions of an accelerating voltage of 300 kV, an irradiation current of 30 skin A, and a dose of Q Mrad.

Thereafter, the polyester film could be easily peeled off. The surface coating film was cured uniformly and well, and a decorative material having sufficient hardness and surface gloss similar to that of the polyester film surface was obtained.

The method for producing a decorative material of the present invention can carry out electron beam irradiation curing of the surface coating layer in the air as described above, so continuous operation is easy, and a uniform product can be obtained at low cost. It is extremely large.

[Brief explanation of the drawing]

The drawing is a sectional view of a semi-finished product at the manufacturing stage of the decorative material of the present invention. 1... Motomura, 2... Adhesive, 3...
... Decorative paper, 3a... Printing ink, 4...
...Electron beam curing paint, 5""" film.

Claims (1)

[Claims] 1 After pasting decorative paper on the wooden or inorganic base material surface using an emulsion-type or solvent-type adhesive, apply an electron beam curable paint, and then cover the coated surface with an air-blocking film. 1. A method for producing a decorative material having a cured coating surface, the method comprising: applying electron beam irradiation in an air atmosphere to form a cured coating, and then peeling off a surface layer film.