JPH06128520A - Ink composition for use in decorative steel plate - Google Patents

Abstract

PURPOSE:To provide a high-quality ink compsn. for use in decorative steel plates which compsn. is excellent in designability and enables steel plates to be stacked even immediately after printing to thereby attain improvements in processing operability and production efficiency. CONSTITUTION:An ink compsn. for printing synthetic resin-laminated steel plates comprises a pigment and a vehicle comprising as the main components (A) a urethane acrylate having a mol.wt. of 1,000 to 20,000 and at least 2 double bonds per molecule and (B) at least 1 (meth)acrylate compd. having at least 1 (meth)acryloyl group per molecule at a (A)/(B) wt. ratio of 100/0 to 20/80.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink composition for decorative steel sheets, and particularly to printing on decorative steel sheets used for building materials, home appliances materials, decorative sheets for kitchen units, unit baths, etc. The present invention relates to an ink composition used for improvement.

[0002]

2. Description of the Related Art Decorative steel sheets laminated with a vinyl chloride resin film having a specific pattern, color or printed layer on the surface of steel sheets are widely used as building materials, home appliance materials, kitchen unit decorative sheets, and unit bath decorative sheets. Has been done. Such a decorative steel sheet is a member having excellent designability and durability in itself, but when printing is further performed on the surface of such a laminated steel sheet (for example, for the purpose of further improving the designability), conventional printing is performed. Ink for use is not always satisfactory in terms of manufacturing process or quality of parts.

[0003] For example, as a conventional method, there is a method of printing with a room temperature dry type ink composition, but this method requires curing after printing and it is not possible to stack steel sheets immediately after printing, so that in the manufacturing process. It was associated with considerable disadvantages.

On the other hand, a method of printing using a low temperature baking type ink composition is also known, but in this method,
There is a problem of deformation and peeling of the decorative plate due to heat. For example, when a steel plate having a multi-layered vinyl chloride laminate or a steel plate having a printing layer formed in a laminate film is used as a printing target, there is a problem that heat during printing tends to cause peeling between the printing layers and the laminating film.

The present invention has been made in view of the above-mentioned problems of the prior art, and is excellent in high quality and design, and at the same time, it is possible to stack and hold steel plates immediately after the printing process. It is an object of the present invention to provide an ink composition for decorative steel sheet, which is improved in operation and production efficiency.

[0006]

The ink composition for decorative steel sheet according to the present invention is an ink composition for printing on a steel sheet laminated with a synthetic resin, comprising a pigment and a vehicle, wherein the vehicle is , (A) molecular weight 100
A urethane acrylate having 0 to 20,000 and two or more double bond groups per molecule, and (B) one or more (meth) acryloyl groups in one molecule (meth).
An electron beam curable ink composition containing at least one acrylate compound as a main component and having the component ratio (A) / (B) in the range of 100/0 to 20/80 on a weight ratio basis. It has a feature.

The constituent components of the composition of the present invention will be described below. The components of the vehicle are (A) a molecular weight of 1,000 to 20,000, and 2 per molecule.
It comprises a urethane acrylate having two or more heavy bond groups, and optionally contains (B) a (meth) acrylate compound containing one or more (meth) acryloyl groups in one molecule. Usually, it is preferable to contain both the components (A) and (B), but a vehicle containing only the component (A) as a main component can be used.

The above-mentioned component (A), a urethane acrylate, is particularly preferable for improving the adhesion and bending workability to a synthetic resin film laminated on the surface of a steel sheet, particularly a vinyl chloride film.

As long as the above conditions are satisfied, a plurality of kinds of urethane acrylates may be blended as needed to use two or more kinds of urethane acrylate to form the component (A).

Specific examples of preferred urethane acrylates satisfying the above conditions include polyether type ones such as DIABEAM UK6034 and UK6035 manufactured by Mitsubishi Rayon Co., Ltd.

As the polyester type,
Mitsubishi Rayon Co., Ltd .: Diabeam UK-6036,
6037, 6039, manufactured by Nippon Synthetic Chemical Industry Co., Ltd .:
Shiko UV-3000B, manufactured by Negami Kogyo Co., Ltd .: Art Resin UN-5200 and the like.

Each can be appropriately selected depending on the purpose of use, but for example, when importance is attached to stain resistance and chemical resistance, a polyether type is preferred, and bending work and adhesion are important. In that case, it is preferable to select the polyester type.

The component (B) comprises a (meth) acrylate compound containing at least one (meth) acryloyl group in one molecule. Specifically, for example, aliphatic acrylate, allyl (meth) acrylate, benzyl (meth) acrylate, 1,4-butanediol (meth) acrylate,
Butoxyethyl (meth) acrylate, cyclohexyl (meth) acrylate, dicyclopentanyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, glycerol (meth) acrylate, 1,6-hexanediol (meth) acrylate, 2-hydroxy Ethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, isobonyl (meth) acrylate, isodecyl acrylate, isooctyl acrylate, lauryl (meth) acrylate, nonylphenoxy polyethylene (polypropylene) glycol acrylate, phenoxyethyl (meth) acrylate , Polyethylene glycol (meth) acrylate, polypropylene (meth) acrylate, tetrahydrofurfuryl (meth) acrylate, fat Di (meth) acrylate, bisphenol A di (meth) acrylate, 1,4-butanediol (meth) acrylate, diethylene (propylene) glycol di (meth) acrylate, glycerol di (meth) acrylate, 1,6-hexanediol di (Meth) acrylate, neopentyl glycol (meth) acrylate, hydroxypivalic acid neopentyl glycol diacrylate, polyethylene (propylene) glycol di (meth) acrylate, aliphatic tri (meth) acrylate, pentaerythritol triacrylate, trimethylolpropane tri (Meth) acrylate, tris (acryloxyethyl) isocyanurate, tris (methacryloxyethyl) isocyanurate and the like can be preferably used.

The component ratio (A) / (B) of the above component (A) and component (B) is 100/0 to 2 on a weight ratio basis.
It is preferably in the range of 0/80, more preferably in the range of 100/0 to 50/50, and particularly preferably 9
It is 0/10 to 70/30.

When the content of the component (A) with respect to the total amount of the component (A) and the component (B) is less than 20% by weight, the viscosity of the ink is drastically lowered, and bleeding or dripping occurs during printing. It causes problems and is not preferable. On the other hand, when the component (B) is contained, it is preferably contained in an amount range of 80% by weight or less. Ingredient (B) is 80
When the content is more than wt%, the viscosity of the ink is lowered, and bleeding and sagging occur during printing. Further, depending on the number of (meth) acryloyl groups in one molecule of the acrylate compound to be used, the hardness, bending workability, and stain resistance of the product may be affected. Therefore, it should be contained in an amount of 50% by weight or less. Particularly preferred.

In the present invention, in addition to the above-mentioned vehicle, a pigment (a pigment in this case means to include other coloring agents such as dyes) is contained, but if necessary, a solvent or other Polymer components can be added.

As the pigment, inorganic and organic color pigments are used. Examples of the inorganic coloring pigment include red iron oxide, yellow iron oxide, chrome vermilion, chromium oxide, carbon black and the like. Further, examples of the organic coloring pigment include quinacridone, isoindolinone, indanthrene blue, phthalocyanine blue, phthalocyanine green and the like. Other examples include titanium white, calcium carbonate, barium sulfate, alumina, silica and the like.

As the solvent, xylene, butyl acetate, cyclohexanone, methyl cellosolve, ethyl cellosolve, morpholine, olefinic solvent and the like can be preferably used.

Further, a specific polymer can be used in order to improve the coating / printing suitability, but in this case, the polymer is preferably polyester, acryl, urethane or epoxy type polymer. In this case, if the addition amount is too large, the performance may be deteriorated, so that the addition amount can be purposely selected.

The decorative steel sheet to be printed with the ink composition of the present invention is not particularly limited,
It exhibits a particularly excellent effect when applied to a laminated steel sheet in which a synthetic resin film or layer is laminated on the surface of a steel sheet base material. Specifically, it can be preferably applied to a multilayer vinyl chloride laminated steel sheet (including a case where a printing layer is formed) in which vinyl chloride resin is laminated in multiple layers.

It should be noted that the laminate film to be printed is one which is not deteriorated by irradiation with an electron beam or one which has been subjected to a deterioration preventing treatment to prevent deterioration of various physical properties such as bending workability and heat resistance. It is preferable above.

As a method for printing using the ink composition according to the present invention, conventionally known means can be appropriately adopted and is not particularly limited, but gravure printing and silk screen printing are preferably used. obtain. Among these, silk screen printing is the most excellent in the case of giving riser printing excellent in design.

After printing on the laminate film by the printing method as described above, a predetermined drying process is performed, and then this is cured by being irradiated with an electron beam to obtain a printed matter.

[0024]

EXAMPLES The present invention will be described more specifically below based on Examples and Comparative Examples. Examples and Comparative Examples An electron beam curable ink composition having the following composition was applied on a steel plate using a vinyl chloride laminate film that had been subjected to a deterioration preventing treatment with an electron beam so that the film thickness was about 10 μm with a silk screen 200 mesh. , Then 100 ℃
It was dried by hot air for 1 minute. Next, using an electron beam irradiation device, in nitrogen gas, 300 kV, 100 mA /
Curing was performed under the conditions of Vm, 9 Mrad and oxygen concentration of 150 ppm or less to obtain a predetermined printed matter.

Urethane acrylate 47 (52) parts Acrylate compound 5 (0) parts Titanium white 42 parts Solvesso 100 3 parts Isophorone 3 parts In order to obtain the above composition, a mixture of up to titanium white is mixed with a three-roll mill. The mixture was kneaded, and then Solvesso 100 and isophorone were mixed by a dissolver.

The physical properties of the printed PVC laminated steel sheet obtained as described above are shown in Table 2 below.

[0027]

[Table 1] (Note) 1) “DIABEAM UK” manufactured by Mitsubishi Rayon Co., Ltd.
6034 "2)" DIABEAM UK603 "manufactured by Mitsubishi Rayon Co., Ltd.
5 ”3)“ DIABEAM UK603 ”manufactured by Mitsubishi Rayon Co., Ltd.
6 ”4)“ DIABEAM UK603 ”manufactured by Mitsubishi Rayon Co., Ltd.
7 ”5)“ DIABEAM UK603 ”manufactured by Mitsubishi Rayon Co., Ltd.
9 ”6)“ Shikou UV-3000 ”manufactured by Nippon Synthetic Chemical Industry Co., Ltd.
B ”7)“ Shikou UV-2700 ”manufactured by Nippon Synthetic Chemical Industry Co., Ltd.
B ”8)“ Aronix M-111 ”manufactured by Toagosei Co., Ltd. 9)“ Aronix M-309 ”manufactured by Toagosei Co., Ltd.

[0028]

[Table 2]

[0029]

[Table 3] In Tables 2 and 3 above, each evaluation is as follows.

1: Poor 2: Slightly bad 3: Fairly good 4: Good 5: Very good In Table 2, Examples 2 to 4 and 8 are sufficiently applied to members having a low processing rate. It is possible. Further, Examples 4, 6 and 9 are sufficiently applicable to members that do not cause a problem of alkali resistance.

[0031]

Since the ink composition for decorative steel sheet according to the present invention comprises an electron beam curable ink composition using a specific vehicle, for example, high quality printing on a multilayer vinyl chloride laminated steel sheet including a printing layer is possible. It is possible to obtain the excellent effect in improving the designability, and since it is possible to stack and hold the steel plates immediately after the printing process, it is also excellent in improving the process operation and the manufacturing efficiency.

Claims (2)

[Claims] 1. An ink composition for printing on a steel sheet laminated with a synthetic resin, comprising a pigment and a vehicle, wherein the vehicle comprises (A) a molecular weight of 1,000 to.
20,000, and the number of double bond groups per molecule is 2
At least one urethane acrylate, and (B) at least one kind of (meth) acrylate compound containing one or more (meth) acryloyl groups in one molecule, as a main component, and the component ratio (A) / (B) Is 1 on a weight ratio basis
It is characterized by being in the range of 00/0 to 20/80,
An electron beam curable ink composition for decorative steel sheets. 2. The ink composition according to claim 1, which is applied to a multi-layered vinyl chloride laminated steel sheet including a printing layer as an object to be printed.