JPH04219176A - Formation of coated resin film - Google Patents

Abstract

PURPOSE:To obtain a coated resin film excellent in lubricity and formability in a time for forming metal to be treated by coating the surface of metallic material to be treated with radiant-ray curing resin coating and then coating the surface of the coated film being in an uncured state with radiant-ray curing resin coating contg. a lubricant and irradiating this coated film with radiant ray to cure it. CONSTITUTION:The surface of metallic material 3 to be treated is coated with radiant-ray curing resin coating to form a first coated film 5. The surface of the first coated film 5 being in an uncured state is coated with radiant-ray curing resin coating contg. a luburicant (e.g. silicone oil) to form a second coated film 6. Then the coated films 5, 6 are irradiated with radiant-ray and cured. As a result, the coated films are cured and treated in a short time. Further even when using radiant-ray curing resin coating which has high hardness and is excellent in wear resistance, these coated films are excellent in adhesive property for the surface of the metallic material to be treated. Moreover the coated resin films are obtained which are excellent in luburicity and formability in a time for forming the metal to be treated.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] This invention relates to a method of coating and forming a resin coating film on the surface of a metal material for coloring, rust prevention, etc. A resin coating film is formed using a radiation-curable resin coating (hereinafter referred to as a radiation-curable resin coating).

0002

[Prior Art] This type of radiation-curable resin paint can be cured in a short time, and because the curing process uses almost no heat, it does not cause thermal effects such as crystal enlargement on the metal material being treated. There is a tendency for it to be used more frequently because it has advantages than other types.

[0003] However, a paint film made of radiation-curable resin paint for plastic coating can be expected to have a pencil hardness of about 5 to 6H, but a coating film made of radiation-curable resin paint for metal coating has a hardness on the surface of the metal material being treated. At present, in order to maintain sufficient adhesion characteristics to a pencil, the pencil hardness is limited to about 1 to 2H.

0004

[Problems to be Solved by the Invention] Therefore, for example, when the surface of the porous screen-like outer blade of an electric shaver is coated with a radiation-curable resin coating for metals alone, the hardness of the coating film is as low as that of a normal thermosetting resin coating. However, on the other hand, it is not suitable for products that require a gentle touch, such as the porous screen-like outer blade of an electric razor.

[0005]

[Means for Solving the Problems] In view of this fact, the present invention aims to apply a lubricant to the radiation-curable resin when applying the radiation-curable resin paint to the surface of the material to be treated to form a coating film. This is the point where it was included.

[0006]

Embodiments Next, embodiments of the present invention will be explained based on the drawings. FIG. 1 illustrates the outer blade of an electric shaver as an example of the metal material to be treated. This outer cutter 1 is formed by electroforming nickel or an alloy of nickel and cobalt, or by pressing an ultra-thin stainless steel plate to form a large number of bristles introducing holes 2 and ribs between the bristles introducing holes. The rib portion 3 has a porous screen shape, and a resin coating 4 for coloring and rust prevention is formed on the surface of the rib portion 3.

In FIGS. 2 and 3, when forming the resin coating film 4 of the nickel outer blade 1, first, a radiation-curable resin coating for metals having a pencil hardness of 1 to 2H is applied to the nickel surface of the rib portion 3. The first coating film 5 having a maximum film thickness of 20 μm is formed by spray coating with a spray gun. As the radiation-curable resin paint, an epoxy-modified acrylate resin paint (trade name MPL-520, manufactured by Dainichiseika Chemical Co., Ltd.) was used, and a diluting solvent (trade name Aronix M7200X, manufactured by Toagosei Kagaku Co., Ltd.) was used. The viscosity was adjusted to about 500.

[0008] Next, the first coating film 5 is not irradiated with ultraviolet rays, and the next second coating film forming step is carried out. That is, in a so-called semi-dry state where the first coating film 5 has solvent remaining and the coating film transfers to the fingertip when touched with the finger,
On the surface of the first coating film 5, a radiation-curable resin paint for plastics (trade name ABS-500, manufactured by Dainichiseika Chemical Co., Ltd.) having a pencil hardness of 5 to 6H is also adjusted to a viscosity of about 500, and the film thickness is The second coating film 6 is formed by spray coating with a spray gun until the thickness is about 30 μm. After that, 80W
/cm x 3 UV irradiation lamps (main wavelength 365nm)
), the first and second coating films 5 are irradiated with ultraviolet light by passing the conveyor once at a speed of 10 m/min.
・6 is cured as described above.

[0009] Next, a comparative example with the coating film obtained in the above example will be given. Comparative Example 1 The first coating film 5 formed in the above example was directly irradiated with ultraviolet rays and cured. The ultraviolet irradiation conditions were the same as those in the above example. Comparative Example 2 A second coating film 6 similar to that in the above example was directly formed on the surface of a nickel outer blade and cured by irradiation under the same conditions. Table 1 below shows a comparison of the performance of the Example product of the present invention obtained from the above results and Comparative Examples 1 and 2.

00010]

[Table 1]

[00011] The "adhesion" in the above table is based on a grid Cellotape test. "Pencil hardness" is JIS K5
400, using UNI pencil. Regarding "abrasion resistance", urethane rubber with a rubber hardness of 45 degrees was pressed with a load of 0.5 kg and rotated 1000 times. As is clear from Table 1 above, the Example products of the present invention are superior in terms of both adhesion and hardness, and also have an advantage over Comparative Example 2 in terms of wear resistance. understood. The reason why the abrasion resistance of the example product of the present invention is superior to that of comparative example 2 is that even though the surfaces of both the example product and comparative example 2 are made of the same material, the example product of the present invention has better abrasion resistance than that of comparative example 2. This is thought to be because the buffer effect of the first coating film acted to evenly distribute the load on the urethane rubber for wear testing. In addition, as the radiation-curable resin coating of the first coating film 5,
Even when using the epoxy-modified acrylate resin paint alone without using a diluting solvent, this first coating film 5
The second coating film 6 is applied and formed in a semi-dry state such that coating transfer occurs on the fingertip when touched with the finger.

Further, the second coating film 6 may be a colored coating film, but if the first coating film 5 is colored and the second coating film 6 is made transparent, a deep coloring effect can be obtained. Also, the second
If the coating film 6 contains 0.5 to 5% by weight of silicone oil, preferably about 1.5% by weight, the slickness of the surface of the resin coating film 4 can be improved due to the bleed phenomenon, resulting in a good touch. This increases the effectiveness of hair introduction. Furthermore, when pressing or bending this metal material, the surface smoothness allows it to easily slide away from a mold, etc., and the surface is less likely to be damaged. Note that the illustrated outer blade is an example of a metal material to be treated, and the present invention can be applied to coating the surfaces of various metal plates such as steel cabinets and external cases of flashlights.

00013

Effects of the Invention As explained above, the resin coating film 4 obtained by the method of the present invention is obtained by applying the radiation-curable resin coating to the surface of the material to be treated to form a coating film. Since the rubber resin contains a lubricant, it provides lubricity, improves press sliding properties, and makes it less likely to be scratched. Furthermore, since the coating film is cured by radiation irradiation, the coating processing time can be shortened, and there is no fear of peeling, which is highly effective when coating metal surfaces that come into sliding contact with other objects.

[Brief explanation of the drawing]

FIG. 1 is a developed plan view of an outer blade of an electric shaver showing an example of a metal material to be treated.

FIG. 2 is an enlarged sectional view of an outer cutter obtained by the method of the present invention.

FIG. 3 is a partially enlarged sectional view in FIG. 2;

[Explanation of symbols]

1 Outer blade of electric shaver (an example of metal material to be treated) 2
Hair introduction hole 3 Rib portion 4 Resin coating film 5 First coating film 6 Second coating film

Claims (1)

[Claims] A method for forming a resin coating film, in which the radiation-curable resin coating is applied to the surface of a material to be treated to form a coating film, the radiation-curable resin containing a lubricant.