JPH02180670A - Simple coating - Google Patents

Abstract

PURPOSE:To permit a uniform coating film to be formed easily on the surface of an object to be coated without the need of any experienced skill by forcibly applying a uniformly thick colored paint layer provided on a substrate to the surface of the object in contact therewith and with heating. CONSTITUTION:A coating sheet 1 having a colored paint layer 2 provided on its substrate 3 in a uniform thickness is laid on the surface of an object 4 to be coated with the paint layer 2 in contact therewith. By means of a pressing instrument 6 provided with a pressing surface 6c elastically deformable when brought in contact with the substrate 3, the paint layer 2 is pressed, while being heated to at least a melting or softening temp. in order to forcibly apply the paint layer 2 to the object surface 4 and the substrate 3 is then removed from the paint layer 2. As a result, this coating method permits a uniform coating film to be formed easily on a small coating surface without the need of any experienced skill.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a simple coating method that can easily form a coating film of uniform thickness on the surface of a suitable member to be coated.

[Conventional technology]

BACKGROUND ART Conventionally, spraying of paint has been a common method for forming a uniform coating film on the surface of lenses, plastic models, or other small objects to be painted.

[Problem to be solved by the invention]

Such spraying of paint not only has the disadvantage that it requires considerable skill to form a uniform coating film, but also has the drawback of spraying paint on parts to be painted in order to prevent environmental pollution caused by scattering paint mist. It also had the disadvantage that the surrounding area needed to be protected and the painting process was time-consuming.

The present invention was made in view of the above-mentioned circumstances, and by devising a mechanism for applying a coating film to the surface of a workpiece, it is possible to easily apply a uniform paint film to the surface of a small workpiece without requiring any skill. To provide a simple coating method that can be formed and does not require much effort in coating work.

[Means to solve the problem]

The characteristic configuration of the simple coating method according to the present invention for achieving the above object is that the colored paint layer is provided on the base material with a uniform thickness, and the colored paint layer side of the coating sheet is placed on the surface of the member to be painted. The colored paint layer is transferred to the surface of the member to be coated under pressure while being brought into contact with the colored paint layer and heated to a temperature higher than the melting temperature or softening temperature, and the base material is peeled off from the colored paint layer.

When the colored paint layer is heated while being pressed by a pressing tool having an elastically deformable pressing surface that comes into contact with the base material side, and the colored paint layer is pressure-transferred onto the surface of the member to be painted, the curved surface of the painted material is applied. It is also efficient in forming a coating film on the surface of parts.

[For production]

The colored paint layer is transferred to the surface of the member to be painted with the same thickness as that provided on the base material without scattering the paint mist, and the surface of the member to be painted has a uniform thickness due to the colored paint layer. A coating film is formed.

When heating a colored paint layer while pressurizing it with a pressing tool having an elastically deformable pressing surface that comes into contact with the base material side, even if the surface of the member to be painted is formed into a curved shape, the pressure of the pressing tool is The surface deforms elastically along its curved shape.

〔Effect of the invention〕

In the simple coating method according to claim 1, a coating film of uniform thickness is formed on the surface of a member to be coated by a colored paint layer of uniform thickness provided on a base material without scattering of paint mist. Therefore, a uniform coating film can be easily formed on the surface of a small member to be coated without requiring P'fa, and the coating operation does not take much time.

In particular, the thickness of the colored paint layer provided on the base material can be controlled within an error range of ±1 μm or less during manufacturing at a factory, etc., so that the uniformity of the coating film can be improved and it can be maintained well. Therefore, it is possible to form a coating film on the surface of a member to be coated, such as a lens, which is sensitive to changes in refraction when light passes through it, in an extremely simple and accurate manner.

The simple coating method according to claim 2 allows the coating sheet to easily follow the uneven or curved surface even if the surface of the member to be coated has some unevenness or curved surface. A uniform coating film can also be efficiently formed on the surface of the member to be coated.

〔Example〕

Next, embodiments of the present invention will be described based on the drawings.

Figure 2 shows a ribbon-shaped coating sheet 1 used in the method of the present invention.
- (1), in which a colored paint layer (2) is provided with a uniform thickness on a base material (3) via a release layer (5) containing silicone resin or fluororesin.

The sheet or film that can be used as the base material (3) has a heat resistance higher than the heating temperature required for transferring the colored paint layer (2), and has a thickness of 1.
Approximately µm to 200 pm is suitable, but this base material (
The thickness of 3) also affects the ease with which it can be applied to the surface of the member to be painted (4), and the thinner the surface of the member to be painted (4), the easier it is to follow the unevenness of the surface of the member to be painted (4). Since it is possible to form a uniform coating film (2a) on the entire surface including the unevenness, the thickness that exhibits such surface conformability is 20 μm.
Hereinafter, it is particularly desirable to set the thickness to 10 μm or less.

In addition, the elasticity of the base material (3) is effective for further increasing the surface conformability, but if the elasticity is too large,
Since the uniformity of the coating film (2a) thickness will be impaired, it is desirable to keep the thickness within an appropriate range.

For these reasons, the following thermoplastic resin sheets or films are suitable as the base material (3). The numbers in parentheses indicate the elongation rate at room temperature.

Polyester (100-300%), polycarbonate (60-100%), polyamide 6 (25-320%)
, polyamide 6.6 (60-300%), high-density polyethylene (15-100%), modified polyphenylene oxide (50-60%), polysulfone (50-10oz)
, films made of thermoplastic resins such as ABS resin (5-25%) or their copolymers, or composite films made by mixing these resins with glass fibers to improve heat resistance, tensile strength, etc. It is appropriate to select and use them according to the conditions.

Further, resins other than those mentioned above can also be used as long as they have the necessary properties.

The colored paint layer (2) is solid at room temperature, melts or softens when heated, and coats the surface of the member to be painted (4).
) is made by dispersing or dissolving a coloring agent such as a pigment or dye in a binder that provides adhesive strength.

The colored paint layer (2) is transferred to the surface (4) of the painted member during the solidification stage after passing through the softened/melted state or after solidification, by softening/melting the colored paint layer (2). This occurs when the adhesive force due to adhesion to the surface (4) is greater than the adhesive force to the substrate (3).

It is not clear what kind of phenomenon causes such a difference in adhesive strength, but the difference between the colored paint layer (2) and the base material (3) is not clear.
) and the surface of the member to be painted (4), or due to the temperature gradient in the layer thickness direction due to heating, the colored paint ii! This is presumed to be due to the fact that the softening/melting state of (2) is different between the interface on the base material (3) side and the surface (4) side of the member to be coated.

In particular, providing the release layer (5) containing silicone resin or fluororesin on the surface of the base material (3) on which the colored paint III (2) is formed is effective in improving transferability. .

Further, the softening point (ring and ball method) or melting point of the colored paint layer (2) is preferably 70 to 240°C, more preferably 100 to 22°C.
Approximately 0°C is appropriate; if this temperature is too high, the base material (
It becomes difficult to select 3), and if it is too low, the heat resistance of the coating film (2a) will be insufficient.

And this kind of colored paint Jl! The binder material constituting (2) is preferably selected from the following thermoplastic materials and is used alone or in combination.

Synthetic hydrocarbon wax, synthetic alloy wax, oxidized wax such as oxidized paraffin wax, oxidized polyethylene wax, low molecular weight polyethylene wax, amide wax, ester wax, au liqueur wax, opal wax, castor wax, carbon wax,
Carnauba wax, candelilla wax, carbowax, ceresin wax, Sasol wax, paraffin wax, paraffin microcrystalline wax, beeswax, Fischer-Tropsch wax, polyamide wax, microcrystalline wax, microwax derivatives, ceresin wax, ceresin wax derivatives , rice wax, insect wax, mineral wax, vegetable wax, animal wax, spermaceti wax, hydrogenated rosin, white wax, beeswax, wood wax, wool wax, esparto wax, auricule wax, cera owl, rosin ester, rosin derivative , rosin aleate resin, rosin phenol resin, rosin maleate resin, other natural and synthetic waxes and their derivatives.

Or, ゛? alkylstyrene polymer, ethylene-vinyl acetate copolymer, ethylene-vinyl acetate-unsaturated acid copolymer, ethylene-acrylic acid copolymer, ethylene-ethyl acrylate copolymer, and their partial oxides and saponification erythr fatty acid ester, oleylamide, oleic acid amide, caproic acid amide, glycerin fatty acid ester, salicylic acid-2-methoxyphenyl ester, dithiooxyamide, styrene-P-chlorostyrene copolymer, styrene-brohylene copolymer Combined, styrene-
α-methyl chloromethacrylate copolymer, styrene-acrylic acid copolymer, styrene-acrylonitrile copolymer, styrene-acrylonitrile-indene copolymer,
Styrene-methyl acrylate copolymer, styrene-ethyl acrylate copolymer, styrene-butyl acrylate copolymer, styrene-methyl methacrylate copolymer, styrene-ethyl methacrylate copolymer, styrene-methacrylate copolymer Butyl acrylate copolymer, styrene-vinyl ethyl ether copolymer, styrene-vinyl methyl ketone copolymer, styrene-vinyl methyl ether copolymer, styrene-vinyl toluene copolymer, styrene-vinylnaphthalene copolymer, Styrene-maleic acid ester copolymer, styrene-maleic acid copolymer, stearic acid acetamide, sorbitan fatty acid ester, methyl-4-
Tert-butylphenol, palmitic acid amide,
Bisphenol A type epoxy 1 acrylate, phenol-modified terpene resin, propionic acid amide, behenic acid amide, benzimide, polyacrylic acid, polyacrylic ester, polyamide, polyacrylamide, polyq-chlorostyrene, polyamideimide, polyurethane, Polyethylene glycol mono- or diester derivatives such as polyester acrylate, polyethylene glycol diacrylate ester, polyethylene glycol fatty acid ester, polyethylene glycol dimethacrylate ester, polyethylene glycol sorbitan fatty acid ester.

Polyexyethylene sorbitan ester, polyexyethylene fatty acid amide, polyexyethylene fatty acid ester sulfate, polyexyethylene fatty acid ester, polyexyethylene alkyl (allyl)′? midophosphate,
Carboxylate of polyexyethylene fatty acid ester, polyexyethylene sorbitan ester, polystyrene,
Methacrylic resins such as polyvinyl alcohol, polyvinyl octadecyl ether, polyvinyl toluene, polyvinyl pyrrolidone, polyvinyl butyral, polyhinyl hexol ether, polymethacrylic acid ester, polymethacrylic acid methyl ester, methyl vinyl ether-maleic anhydride copolymer Combined, 1-(2-pyridylazo)-2-phenol, 1-phenylazo-2-phenol, 2,2-'? zodiphenol, 2-nitrone-4-methoxyphenol, 2-nitrosophenol, 2-hydroxyphenylazo-2-phenol, 4-hydroxybenzoic acid phenyl ester,
4-hydroxybenzoic acid-2-methoxyphenyl ester, 4-benzoyloxybenzoic acid methyl ester, 4-benzoyloxybenzoic acid phenyl ester, N,N-dimethyl-dithiooxyamide, N-ethyl-p-toluenesulfonamide, N -Cyclohexylstearamide, N-stearylbenzamide, N-methylstearamide, N-cyclohexylstearamide, N-fatty acid alkyl ester, benzoic acid alkyl ester, vinyl chloride-vinyl acetate copolymer, vinyl chloride-acetic acid Vinylidene copolymer, polyoxyethylene ether ester of the above copolymer, higher fatty acid ester, higher fatty acid amide, vinyl acetate
Ethylene copolymer, linear saturated polyester resin, low molecular weight polystyrene, low molecular weight poly(7mide), acrylic modified polyester, acrylic modified polyether, acrylic modified polypropylene glycol, acrylic modified polyacrylic acid alkyl ester copolymer, acetamide, adipine Acid ester resin.

The thickness of this colored paint layer (2) is 1 μm"1
If it is too thin, the formation of a coating film on even the slightest unevenness will be inhibited, and if it is too thick, the subtle unevenness on the surface of the member to be painted (4) will disappear. A good paint film (2a) that has been damaged or cracked
formation becomes impossible.

The method of forming the colored paint layer (2) on the base material (3) is, for example, by applying a paint obtained by mixing and dispersing a binder material and a coloring material onto the base material (3) in a state in which it is melted by heating. A hot melt coating method or a liquid paint prepared by mixing a coloring material in a solution obtained by dissolving the binder material in a continuous solvent is applied onto the base material (3) using a coater such as a gravure coater or a tube coater. The liquid paint is applied to the substrate (
3) Either by the so-called solvent coating method in which the binder material is placed on top and dried, or by applying an emulsion in which a colorant is mixed into a suspension dispersed in a liquid that does not dissolve the binder material (for example, water), using a coater such as the one described above. It is possible to form by using a method such as providing on the base material (3) and drying.

Next, the method of the present invention will be explained based on FIG.

As shown in Figure 1 (a), the colored paint layer (2) side of the painting sheet (1) is placed against the surface (4) of the object to be painted, such as a plastic lens or plastic model, and the heater (6a) is turned on. A roller (6
) while heating the colored paint layer (2) above its melting or softening temperature.
2) is pressure-transferred onto the surface of the member to be coated (4) to form the base material (3).
) is peeled off from the colored paint layer (2), as shown in Figure 1 (E
As shown in 1), a coating film (2a) of uniform thickness is formed on the surface (4) of the member to be coated.

The rotating member (6b) of the roller (6) is made of heat-resistant rubber or resin sponge, and is configured such that the pressing surface (6C) is elastically deformed when it comes into contact with the base material (3). Even if the surface of the member to be painted (4) has some unevenness or curved surface, the coating sheet (1) can be placed along the surface of the member to be painted (4) with good uniformity. ) so that a uniform coating film (2a) can be formed evenly.

[Another example]

The coloring material and binder material should be transparent, and the thickness of the layer should be as thin as possible (if a colored paint layer with high visible light transmittance is used, a colored paint layer of a different color may be applied to the surface of the member to be painted). By layering and transferring the
Since different colors can be obtained by subtractive color mixing, it is possible to form coating films of many colors on the surface of the member to be coated by combining colored paint layers of few colors.

If a colored paint layer with low light transmittance and enhanced masking properties is used by appropriately selecting a coloring material or its auxiliary material, it is possible to erase even the background color and dirt on the surface of the member to be painted. . Particularly when using the above-mentioned transparent colored paint layer, if this colored paint layer with low light transmittance is transferred as the first coating film, the desired color can be achieved without being affected by the ground color of the member to be painted. A coating film can be formed on the surface of a member to be coated.

When the colored paint layer is formed into a suitable repeating pattern, a coating film having the pattern can be formed on the surface of the member to be coated.

It is also possible to form a suitable pattern on a member to be painted by cutting this painting sheet into a suitable shape and transferring it to a predetermined location on the member to be painted, as in paper-cutting.

In this case, after transferring the cut painting sheet that forms the pattern, if you overlap and transfer the painting sheet of the background color without peeling off the base material, the base material of the painting sheet that was previously transferred will be It functions as a barrier, and it is possible to form a coating film with a beautiful pattern without irregular color cast on the surface of the member to be coated.

Further, in the case where the coating sheet is pressed against the flat surface of the member to be coated and heated while being pressurized, a pressing tool having a flat hard pressing surface such as an iron can be used.

Components to be coated include plastics, metals, glass,
There are various containers, packages, plates, lenses, models, and their parts made of paper, etc.

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of the drawing]

The drawings show an example of the simple painting method according to the present invention, and the first
Figures (() and (11) are cross-sectional side views of essential parts, and Figure 2 is a perspective view of a coating sheet used in the method of the present invention. (1)...Painting sheet, (2)・・・・・・
Colored paint layer, (3)...Base material, (4)...
... Surface of the member to be painted, (6) ... Pressing tool,
(6c)...Press surface. Figure (b) Figure

Claims (1)

[Claims] 1. The colored paint layer (2) side of the coating sheet (1), in which the colored paint layer (2) is provided on the base material (3) with a uniform thickness, is attached to the member to be painted. The colored paint layer (2) is pressure-transferred onto the surface (4) of the member to be painted while heating the colored paint layer (2) above the melting temperature or softening temperature in contact with the surface (4). A simple painting method for peeling off the base material (3) from the colored paint layer (2). 2. Heating the colored paint layer (2) while pressing it with a pressing tool (6) having a pressing surface (6c) that can be elastically deformed when in contact with the base material (3) side, and applying heat to the painted member The simple coating method according to claim 1, wherein pressure transfer is carried out on the surface (4).