JPS62113549A - Manufacture of decorative steel plate - 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 (Field of Industrial Application) The present invention relates to a decorative steel sheet having a three-dimensional effect.

(Prior art) The idea of using the d5 transfer method in the production of decorative steel sheets is as follows.
For example, as described in Japanese Unexamined Patent Publication No. 58-145448, a method is generally used in which a primer and base coating are applied to the surface of a steel plate, and then transfer sheets 1 to 1 are overlaid to transfer the pattern.

However, this method only has a pattern on the surface, which lacks a three-dimensional effect, and when thermosetting resin is used to increase the surface hardness, the base material is a steel plate, so heat aging between the strips is difficult. It is necessary, uneconomical and rare. Furthermore, the above publication also describes that pressure embossing is performed later using an embossing plate;
Merely adding unevenness is not sufficient to express a three-dimensional effect, and a better expression method was needed.

(Problems to be Solved by the Invention) The present invention aims to solve the above-mentioned drawbacks of the prior art, and provides a method for economically producing a decorative steel sheet with a rich three-dimensional effect and a high surface hardness. The purpose is to provide the following.

(Means for Solving the Problems) If the method of the present invention is explained according to the drawings, the present invention will be explained in the first aspect.
As shown in the figure, a solvent-based electron beam curing resin (2) is applied to the surface of a steel plate (1), an embossed transfer film (3) is placed on top of it, and an electron beam is irradiated from above the embossed transfer film. The purpose of this method is to remove the synthetic resin film and the raised pattern after curing the solvent-based electron beam curable resin (2). A pattern is formed on the surface of a moldable synthetic resin film (31) with an ink (32) that contains a matting agent and has mold releasability for electron beam curable resin, and then a curable ink is further applied on the surface of the moldable synthetic resin film (31). The pattern layer (
33) is used.

In addition, the surface of the steel plate (1) is coated with a pattern layer (4) and a base paint layer (
5) can be prepared in advance, and the embossed film (
In order to adjust the gloss on the surface of the synthetic resin film (31) having a desired gloss releasability used in step 3), a gloss adjusting resin layer ( 34) can also be formed.

Steel plates (1) that can be used in the method of the present invention include cold rolled steel plates,
The solvent-free electron beam curable resin (2) to be applied to the surface of a galvanized steel plate, etc., is a known composition having an ethylene double bond in its molecule that is cured by electron beams, as well as methyl ethyl ketone, etc. For example, prepolymers or oligomers having ethylenic double bonds in the molecule, unsaturated polyesters, polyester acrylates, epoxy acrylates, urethane acrylates, polyether acrylates, etc. can be used. , various acrylates such as polyol acrylate, melamine acrylate, polyester methacrylate-1~, epoxy methacrylate, urethane methacrylate, polyether methacrylate-1, polyol methacrylate-1~, melamine methacrylate, etc. 7-mers having an ethylenic double bond
1. For example, styrene nail polishers such as styrene and α-methylstyrene, methyl acrylate, 2-ethylhexyl acrylate, methoxyethyl acrylate, butoxyethyl acrylate, butyl acrylate, methoxybutyl acrylate, and methacrylic acid esters. , methacrylic acid esters such as methyl methacrylate, ethyl methacrylate, propyl methacrylate, methoxyethyl methacrylate, 1-xyethyl methacrylate, phenyl methacrylate, and lauryl methacrylate; Saturated carboxylic acid amide, acrylic r! i2- (N, N dimethylamino) ethyl, methacryl M2- (N, N dimethylamino) ethyl, 2- (N, N dimethylamino) ethyl acrylate, methacryl! 2-(N,N dimethylamino)methyl, acrylic M2- Substituted amino alcohol esters of unsaturated acids such as (NSN dimethylamino)propyl, ethylene glycol diacrylate, propylene glycol diacrylate-1~, neopentyl glycol Diacrylate, 1.
6-hexanediol diacrylate, diethylene glycol diacrylate, diethylene glycol diacrylate, triethylene glycol diacrylate, dipropylene glycol diacrylate, ethylene glycol dimethacrylate, propylene glycol dimethacrylate, diethylene glycol dimethacrylate, etc. One or a mixture of two or more polyfunctional compounds, or a compound having an ethylenic double bond and a polythiol compound having two or more diol groups in the molecule, such as trimethylolpropane-1 to lithiogly-1 A mixture of -11-limethylolpropane trithiopropine-1., pentaerythritolte-1-latioglycolate, etc., mixed with an organic solvent can be used.

(d'3) By using a solvent-based resin, a resin layer with a smooth surface can be formed, so the difference in gloss on the surface of the embossed transfer film can be faithfully reproduced.

The synthetic resin film (31) constituting the embossed transfer film (3) includes polyethylene film, polypropylene film, polyvinyl chloride film, polyester film, polyvinylidene chloride film, polyvinyl alcohol film, polyethylene terephthalate 1-film, It has mold releasability for electron beam curable resins such as polycarbonate film, polycarbonate film, polystyrene film, ethylene vinyl acetate copolymer film, and ethylene vinyl alcohol copolymer film, and is transparent to electron beams. The gloss of the surface can be arbitrarily selected from mirror to matte.

The ink (32) containing a matting agent and having mold releasability for electron beam curable resin is an ink containing a known binder such as alkyd, vinyl, acrylic, polyamide, or epoxy. A mixture of pine 1-agents such as raw materials, which has good adhesion to the synthetic resin film (31) and has m-type properties with respect to electron beam curable resins, is selected and used.

The pattern layer (33) is formed using curable ink.

The curable ink is an ink that uses a known curable resin such as acrylic or epoxy resin as a binder.

The gloss adjusting resin layer (34) is formed to change the gloss level of the surface of the synthetic resin film (31), and specifically,
The matting agent is formed by using a resin having the same composition as the ink (32) which contains a matting agent and has m-type properties with respect to an electron beam curable resin, or by using the same ink from which the matting agent is removed.

Ink (32) containing Pine 1 to agent and gloss adjusting resin layer (3
4) Needless to say, materials that transmit electron beams should be used for both.

The pattern layer (4) and base paint layer (5) are formed using a known ink or paint such as vinyl, acrylic, polyester, epoxy, or polyamide. - The electron beam is irradiated using a scanner type or curtain type electron beam accelerator, and the irradiation dose is 0.1 MeV to 2 MeV, and 3 Mrad to 20 Mrad is suitable.

In addition, in the method of the present invention, since the electron beam is irradiated with the electron beam curable resin covered with an embossed film, there is no need to replace the air around the irradiated area with an inert gas such as nitrogen.

(Function) An embossed film with a pattern formed by difference in gloss is placed on top of the uncured electron beam curable resin, and the electron beam is irradiated in that state. This is faithfully reproduced on the surface of the beam-curable resin layer, and combined with the formation of recesses equal to the thickness of the ink that contains a matting agent and has releasability for the electron beam-curable resin, this creates a rich three-dimensional effect. It has a dull appearance. Furthermore, since the uppermost layer of the obtained decorative steel sheet is a layer of hardened electron beam curable resin and a pattern layer formed by transferred hardening ink, the decorative steel sheet has a high surface hardness. Furthermore, since a solvent-based electron beam curing resin is used, the surface of the resin layer is smooth, and the difference in gloss on the surface of the embossed film can be faithfully reproduced.

(Example 1) After degreasing the surface of a 0.4# thick galvanized steel plate and applying a rough chemical conversion treatment, an electron beam curable resin of the following composition was applied so that the coating film thickness after curing would be 20μ. After coating with a roll coater and heating at 120℃ for 30 seconds to remove the solvent,
On top of that, a convex pattern is formed using an alkyd ink containing 7 parts of silicon on a 25μ thick 7 part polyester film, and then a lattice pattern is formed using an acrylic curing ink on top of that. The embossed transfer film with the pattern formed thereon was overlaid.

Electron beam curable resin composition Next, using an electron beam irradiation device manufactured by Energie Iens, the polyester film and the convex pattern were removed after irradiation with an electron beam at 1 MeV and 5 Mrad. A decorative steel sheet with an excellent three-dimensional effect was obtained.

(Example 2) A gloss-adjusting resin layer made of a resin containing 1 part by weight of silicon was formed on the surface of a polyester film with a specular gloss. 1) A convex pattern was created using an alkyd-based ink containing 7 parts by weight of silicon. A decorative steel plate with a three-dimensional effect was prepared in the same manner as in Example 1, except that an embossed transfer film with a pattern for transfer formed using salt-vinyl acetate ink was used.

(Effect of the invention) ■A decorative steel sheet with a rich three-dimensional effect can be obtained.

■Since the electron beam is irradiated with the embossed films stacked one on top of the other, there is no need to replace the film with nitrogen.

■Since a solvent-free electron beam curable resin is used, there is no negative effect on the gloss of the embossed film surface, and a sharp three-dimensional effect can be reproduced.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view for explaining the method of the present invention, with the embossed transfer film removed, and FIG. 2 is a cross-sectional view showing an example of the embossed transfer film used in the present invention. (1)... Steel plate (2)... Electron beam curing resin (3)... Embossed transfer film (31)...
... Synthetic resin film (32) ... Ink containing matting agent (33) ... Pattern layer (34) ... Gloss adjustment resin layer (4) ... ...Pattern layer (5) ...Base paint layer

Claims (1)

[Claims] A raised pattern is formed on the surface of a synthetic resin film with a desired gloss and release properties using an ink that contains a matting agent and has release properties for electron beam curable resins, and then a curable ink is applied on top of the ink. An embossed transfer film with a pattern layer formed thereon is placed on a steel plate whose surface has been coated with a solvent-based electron beam curable resin, heated to remove the solvent, and irradiated with an electron beam to form the embossed transfer film. A method for producing a decorative steel sheet, which comprises removing a synthetic resin film and a raised pattern after curing an electron beam curing resin.