JPH0818396B2 - Lacquer-coated steel sheet and manufacturing method thereof - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lacquer-coated steel sheet used for interior materials, furniture materials, office equipment materials, home electric appliance materials and the like, and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, as a method of applying natural lacquer to a metal surface, a thin lacquer obtained by filtering and refining sap of lacquer is thinly applied to the metal surface and baked at 150 ° C. for 30 minutes to 1 hour to form an oxide film on the metal surface. After pre-treatment to form the, coconut, chrome-finished purified lacquer is hand-painted, then in a lacquer bath for 12 hours to 24 hours.
After soaking for a period of time, it was dried, followed by a step of polishing and smoothing a brush with a spatula.

Further, as disclosed in Japanese Patent Laid-Open No. 61-10497, a lacquer transfer layer is formed on one surface of a paper-like body such as a synthetic resin film or synthetic paper, and an adhesive is applied to a metal surface, for example. , A technique of attaching the lacquer transfer layer surface to a metal surface has been proposed.

[0004]

By the way, as described above, the method of applying natural lacquer to the metal surface requires a professional craftsman who does not wear lacquer, and since it is handicraft,
There are problems such as lack of uniformity of quality and mass production, and difficulty in processing a large area due to the size of the lacquer bath in the lacquer coating industry.

Further, in the lacquer transfer material disclosed in the above-mentioned Japanese Patent Laid-Open Publication, the lacquer transfer layer is liable to crack and is difficult to handle. However, there is a problem that advanced technology, labor and environment are required, such as uniform application of an adhesive to a material to be transferred and complete removal of dust.

[0006]

The present invention was developed to solve the above-mentioned conventional problems, and the first gist thereof is to apply lacquer to one surface of a synthetic resin film, and Film-like lacquer that has been dried and solidified, a heat-sensitive adhesive film that is attached to the lacquered surface of this film-like lacquer via an adhesive, and the thickness that is attached to this heat-sensitive adhesive film surface at high temperature and high pressure.
A lacquer-coated steel sheet is composed of a steel sheet having a thickness of 0.5 mm or more .

The second gist of the present invention is as follows.
Apply lacquer continuously and evenly to one side of the synthetic resin film,
Then, it is dried and solidified to form a film-shaped lacquer, an adhesive is applied to the lacquered surface of this film-shaped lacquer, and a heat-sensitive adhesive film is attached, and a steel plate is attached to this heat-sensitive adhesive film surface by a high-temperature high-pressure multi-stage press machine. And to produce a lacquer-coated steel sheet by cooling at high pressure.

[0008]

As described above, the lacquer-coated steel sheet according to the present invention has a heat-sensitive adhesive film attached to the lacquer surface of a film-shaped lacquer via an adhesive, and the steel sheet is applied to the heat-sensitive adhesive film surface by a high-temperature high-pressure multi-stage press machine. Since they are attached, the film-like lacquer and the steel plate can be attached more reliably and firmly than simply attaching with an adhesive.

The lacquer layer of the film-like lacquer is solidified by three-dimensional crosslinking caused by an air oxidation action, but exhibits viscoelasticity at a press temperature of 80 ° C. or higher, and due to a high pressure, it becomes a mirror surface pressing plate of a press machine. The lacquer-coated steel sheet with uniform quality can be obtained because it can be synchronized with the smoothness and retain the luster and sharpness peculiar to lacquer.

Further, the conventional method of applying natural lacquer on the metal surface required a lacquer bath, but since the present invention does not require a lacquer bath at all, it produces a large area of lacquer-coated steel sheet having a larger area than before. be able to.

[0011]

[Examples] A lacquer-coated steel sheet according to the present invention will be described with reference to FIG. 1. After one side of a polyester film 1a having a thickness of 75μ is filtered and defoamed with purified kurome black lacquer 1b that has been subjected to chrome processing , Apply it to a thickness of 40μ with a pipe doctor coater, and keep the temperature in a clean room with constant temperature and humidity.
A film lacquer 1 is formed by curing at 20 ° C and humidity 70% for 36 hours and drying.

Next, on the lacquer 1b surface of the film-like lacquer 1,
Silicon adhesive 2 is applied to a thickness of 10μ, and polyolefin adhesive heat-sensitive adhesive film 3 with a thickness of 50μ is attached to the adhesive 2 side, and then 0.5mm thick stainless steel is applied to the heat-sensitive adhesive film 3 side. The steel plate 4 is attached by a high-temperature and high-pressure multi-stage press machine, and is cooled at high pressure to produce a lacquer-coated steel plate A.

FIG. 2 shows another embodiment of the present invention in which a base material 5 having a poor surface smoothness such as a wood board or an inorganic board is attached to the steel plate 4 surface of the lacquer-coated steel sheet A. .

FIG. 3 shows a comparative example in which a composite sheet comprising the film-like lacquer 1 and the heat-sensitive adhesive film 3 is directly attached to the base material 5.

The layer thickness of the lacquer 1b in the film-like lacquer 1 is
The range of 20 μ to 50 μ is preferable, and if it is 20 μ or less, the flesh-like feeling peculiar to lacquer cannot be obtained, and if it is 50 μ or more, uniform drying and solidification becomes difficult.

The adhesive 2 may be arbitrarily selected from silicon-based, polyester-based, acrylic-based, epoxy-based, urethane-based, polyamide-based, etc., which has good adhesiveness to the surface of the lacquer 1b, and its coating thickness Is preferably in the range of 10 μ to 20 μ.

The thickness of the heat-sensitive adhesive film 3 is 30 μ-1
The range of 00 μ is preferable, and in addition to the polyolefin type, polyester type, polyamide type, polyvinyl chloride type, and acrylic type may be arbitrarily selected and used.

The steel plate 4 may be a galvanized steel plate, a PCM steel plate or the like other than the stainless steel plate, and the thickness thereof is preferably 0.5 mm or more, and the thickness is 0.5 mm.
In the following cases, as in the other embodiment shown in FIG. 2, when it is combined with the base material 5 having poor surface smoothness, the unevenness of the base material 5 appears on the surface of the lacquer 1b, which is not preferable.

As in the comparative example shown in FIG. 3, film-like lacquer 1
When a composite sheet consisting of the heat-sensitive adhesive film 3 and the heat-sensitive adhesive film 3 is directly attached to the base material 5, a large amount of dust adheres to the surface of the base material 5 and the smoothness is poor, so that the luster and sharpness peculiar to lacquer The sex was lost and the satisfactory result was not obtained.

[0020]

As described above, the lacquer-coated steel sheet according to the present invention has the heat-sensitive adhesive film attached to the lacquer surface of the film-like lacquer via the adhesive, and the heat-sensitive adhesive film surface is subjected to a high-temperature high-pressure multi-stage pressing machine. Since the steel plate is attached by, the film-like lacquer and the steel plate, rather than simply pasting with an adhesive,
It can be attached more reliably and firmly.

The lacquer layer of the film-like lacquer is three-dimensionally cross-linked by air oxidation and solidifies, but exhibits viscoelasticity at a press temperature of 80 ° C. or higher, and due to high pressure, it becomes a mirror surface pressing plate of a press machine. The lacquer-coated steel sheet with uniform quality can be obtained because it can be synchronized with the smoothness and retain the luster and sharpness peculiar to lacquer.

Further, in the conventional method of applying natural lacquer to the metal surface, a lacquer bath was required, but in the present invention, the lacquer bath is not required at all, so a large amount of lacquer-coated steel sheet having a larger area than before is produced. be able to.

[Brief description of drawings]

FIG. 1 is an enlarged sectional view showing an embodiment of the present invention.

FIG. 2 is an enlarged sectional view showing another embodiment of the present invention.

FIG. 3 is an enlarged cross-sectional view showing a comparative example with respect to the present invention.

[Explanation of symbols]

 1 Film-like lacquer 1a Polyester film 1b Lacquer 2 Silicone adhesive 3 Polyolefin-based heat-sensitive adhesive film 4 Stainless steel plate A Lacquer-coated steel plate 5 Base material for wood-based board, inorganic board, etc.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toritane Terada 2-3 2-3 Uchisaiwaicho, Chiyoda-ku, Tokyo Kawasaki Steel Co., Ltd. Tokyo headquarters (72) Inventor Kazuo Kuzukawa Nijo-dori Nishitoin, Nakagyo-ku, Kyoto-shi, Kyoto Higashiiri Le Shogyoji-cho 6600 Pick-up Address in Kuzukawa Industry Co., Ltd. (72) Inventor Yoshiaki Kawazoe 1-4-16 Nihonbashi-Bakurocho, Chuo-ku, Tokyo Fujimori Kogyo Co., Ltd. (56) Reference JP-A-63- 186790 (JP, A) JP 59-73081 (JP, A) JP 2-283438 (JP, A)

Claims (2)

[Claims] 1. A film-like lacquer in which lacquer is applied to one surface of a synthetic resin film and dried and solidified, a heat-sensitive adhesive film attached to the lacquer surface of the film-like lacquer via an adhesive, and this heat-sensitive adhesive film. The thickness of the film is 0.
A lacquer-coated steel sheet consisting of a steel sheet of 5 mm or more . 2. A heat-sensitive adhesive film in which a lacquer is continuously and uniformly applied to one surface of a synthetic resin film and dried and solidified to form a film-like lacquer, and an adhesive is applied to the lacquer surface of the film-like lacquer. The method for producing a lacquer-coated steel sheet according to claim 1, wherein the heat-sensitive adhesive film surface is affixed with a steel plate by a multi-stage press machine at high temperature and high pressure, and is cooled at high pressure.