JPH0114826B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a polyester decorative board having an embossed pattern.

Conventionally, methods for forming embossed patterns on polyester decorative boards include (1) mixing a curing inhibitor into a part of the printing ink of the decorative paper, and forming a polyester between the areas where this curing inhibitor acts and the other areas; (2) A method of pressing a metal backing plate with an embossed pattern onto a polyester paint; (3) A method of forming an uneven pattern on a thermoplastic film using a printed layer. A method of using this instead of the metal backing plate mentioned above (Special Publication No. 38-23033)
etc. are known.

Method (1) does not produce a sharp embossed pattern, method (2) costs money to manufacture the metal backing plate, and method (3), although simple and desirable, does not allow for printing. There were disadvantages such as cohesive failure of the layers or delamination between the layers and the thermoplastic film, making it impossible to obtain a desired pattern, and furthermore, the film could not be reused.

The present invention solves the above problems, and particularly improves the method (3) above.

That is, in the present invention, a decorative paper is bonded to a substrate, a thermosetting polyester paint is applied thereon, and furthermore, a material that has releasability to the polyester paint and has a surface that is coated with a thermosetting polyester paint. By laminating a release sheet with a printed layer on which the surface of the ink film made of ink containing a thermal polymerization inhibitor has release properties so that the printed layer faces the surface coated with the paint, and then heating. The present invention provides a method for producing a polyester decorative board having an embossed pattern, which is characterized in that the release sheet is peeled off together with the printed layer after the paint is cured.

As the substrate in the present invention, plywood, resin board,
These include metal plates, glass plates, inorganic plates, particle boards, hard boards, etc.

The release sheet used in the present invention needs to be easily peelable from the cured film of the thermosetting polyester paint, such as vinylon film,
Cellophane, nylon film, vinyl polyfluoride, OPP film, PET film, etc. are used, and these films may have their surfaces subjected to release treatment or matte treatment. Among these, vinylon film has excellent workability and removability when manufacturing polyester decorative laminates.
Moreover, when a polyisocyanate-based printing ink is used, it is a preferable film because it has particularly good adhesion to the printing ink.

As the printing ink, one is selected that has a stronger adhesive force with the release sheet than the adhesive force with the cured coating film of the thermosetting polyester paint and does not cause cohesive failure. For example, reaction-curing printing inks such as polyisocyanate-based printing inks and ultraviolet or electron beam-curing printing inks are desirable, but solvent evaporation printing inks such as polyamide-based and polyvinyl alcohol-based printing inks may also be used. Can be done. As the thermal polymerization inhibitor contained in this printing ink, known ones such as hydroquinones, phenols, amines, sulfur compounds, and nitro compounds can be used. If this thermal polymerization inhibitor is not added, the printing ink on the release sheet is prone to cohesive failure and can only be reused once, but if it is added, it can be used up to ten times. , the industrial value is extremely large. This is because the thermal polymerization inhibitor in the printing ink film gradually bleeds onto the surface of the film and suppresses the curing of the thermosetting polyester paint at the interface of the printing ink film, resulting in a significant improvement in mold releasability. There have been no known attempts to apply the effects of such thermal polymerization inhibitors.

Therefore, for this purpose, it is not necessary to add a large amount of thermal polymerization inhibitor, and adding a large amount will actually cause poor curing of the thermosetting polyester paint, so it varies depending on the type, but for example, 0.01-10% by weight relative to printing ink, preferably
It is 0.1 to 5% by weight.

Furthermore, extender pigments, matting agents, flaky mica, and the like can be added to this printing ink for the purpose of imparting printability, a raised effect, a matting effect, and mold release properties.

The printing method is not particularly limited, but silk screen printing and gravure printing are preferred. In particular, silk screen printing allows thick printing and deep embossing with sharpness, which can be applied to wood grain patterns. Gravure printing can print in large quantities and produce sharp embossing, but deep embossing cannot be achieved. However, contrast can be created by the presence or absence of gloss, and it can be applied to patterns such as stone-like or mosaic-like patterns.

The present invention will be explained below using specific examples. Parts in the examples indicate parts by weight.

Example 1 A cloth texture pattern was printed on the glossy surface of a polyester film using a 100-mesh silk screen using silk screen printing ink with the following formulation.
An embossed sheet was obtained after curing at 40°C for 4 days.

(Silk screen printing ink formulation) Desmofene 1200 (manufactured by Bayer, polyester polyol) 60 parts Fine aluminum powder 3 parts Hydroquinone 0.5 parts Cyclohexane 10 parts High-boiling hydrocarbon solvent 10 parts Tolylene diisocyanate 50 parts Particle board 9 mm thick A titanium decorative paper with a cloth pattern printed on it is bonded with an adhesive, and a paint consisting of 100 parts of unsaturated polyester paint and 1 part of benzoyl peroxide is applied on top of this, and the above embossed sheet is placed on top of the printed surface. The sheets were laminated with the sheets facing down, and after degassing, they were cured by heating at 50° C. for 1 hour. When the embossed sheet was peeled off, a polyester decorative board with a glossy surface and embossed grains was obtained. This embossed sheet withstood being reused more than 5 times.

Comparative Example 1 When working in the same manner as in Example 1 except that hydroquinone was removed from the formulation of the silk screen printing ink in Example 1, cohesive failure of the printing ink layer occurred on the embossed sheet for the second time, and it was not possible to reuse it. I couldn't stand it.

Example 2 A zelkova plate conduit hole pattern was printed on the matte surface of a vinylon film using a gravure plate with a plate depth of 60 μm using a gravure printing ink having the following formulation, and after curing at 50° C. for 24 hours, an embossed sheet was obtained.

(Gravure printing ink formulation) Desmofene 1200 40 parts Olester Q602 (manufactured by Mitsui Toatsu Co., Ltd., acrylic polyol) 30 parts p-methoxyphenol 8 parts Methyl ethyl ketone 25 parts Toluene 25 parts Suprasek 3340 (manufactured by Nippon Polyurethane Co., Ltd., polyisocyanate compound) 50 A titanium paper printed with a zelkova grain pattern was bonded to plywood via an adhesive, and the same procedure as in Example 1 was carried out to obtain a wood grain polyester decorative board having an embossed pattern. This embossed sheet withstood being reused more than 5 times.

Claims (1)

[Claims] 1. Decorative paper is bonded to a substrate, a thermosetting polyester paint is applied thereon, and a surface of the paper is coated with a thermosetting polyester paint that has mold releasability for the polyester paint. In this step, a release sheet having a printed layer on which the surface of the ink film made of ink containing a thermal polymerization inhibitor has release properties is laminated so that the printed layer faces the surface coated with the paint, and then heated. A method for producing a polyester decorative board having an embossed pattern, which comprises curing the paint and then peeling off the release sheet together with the printed layer. 2. The method for producing a polyester decorative board according to claim 1, wherein the printing layer is provided using a reaction-curing printing ink.