JPH01249862A - Method for relief coating of substance pattern - Google Patents

Abstract

PURPOSE:To enable solid relief view of a pattern formed on an optional substrate surface, by applying a coating containing specific spherical transparent resin particles in a resin binder to the surface of a substrate having an optional pattern. CONSTITUTION:A coating containing (B) a spherical transparent resin particles (preferably a resin having >=100kg/cm<2> tensile strength, >=300% elongation and a 100% stress strength of <=1/3 breaking strength) containing >=75wt.% particles thereof having 2-20mu particle diameter in (A) a resin binder preferably having film characteristics of >=100kg/cm<2> tensile strength, >=300% elongation and a 100% stress strength of <=1/3 breaking strength is applied to the surface of a substrate having an optional pattern so as to provide 10-50mu dried film thickness. The resin particles are contained at a weight ratio of 0.5-3 times based on the resin binder. Thereby, relief coating of the substrate pattern is carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a coating method in which a pattern formed on the surface of an arbitrary base material is made to appear three-dimensionally embossed by coating.

[Conventional technology and its problems]

Conventionally, attempts have been made to protect and enhance the design of the base material by applying glossy clear resin paint or matte paint mixed with inorganic or organic fine powder to the surface of the base material on which a pattern has been formed. The coating method is generally well known and widely practiced in various fields.

However, with conventional painting methods, the pattern on the base material is only visible as a change in gloss, and the pattern on the base material can appear three-dimensionally embossed through the coating film, resulting in poor design. There are problems. In particular, when a matte paint is used, the pattern on the surface of the base material appears thin and blurred, and there is no hope of improving the design.

The present invention was made in view of the above-mentioned current situation, and even though the surface of the coating film formed is matte,
The purpose of this invention is to provide a coating method that allows the pattern of a base material to appear clearly and three-dimensionally.

[Means to solve the problem]

In order to achieve the above object, the coating method of the present invention applies spherical transparent resin particles, of which 75% by weight or more has a particle size in the range of 2 to 20 μm, to a resin binder, on the surface of a base material having an arbitrary pattern. It is characterized in that a paint containing 0.5 to 3 times the amount by weight is applied so that the dry coating thickness is 10 to 50 μm.

The resin binder that can be used in the present invention is not particularly limited, and resin binders commonly used in the paint industry, such as alkyd resins, acrylic resins, polyurethane resins, epoxy resins, polyester resins, Synthetic resins such as vinyl chloride resin,
Or natural rubber, synthetic rubber, etc. Among these resin binders, tensile strength of 100 kg/cm or more,
Film properties with an elongation rate of 300% or more and a 100% stress strength of 1/3 or less of the strength at break, especially a tensile strength of 200 kg/
By using a film with characteristic values of cv/ or more, elongation rate of 400% or more, and 100% stress strength of 1/10 or less of the strength at break, the resulting coating film will form an embossed pattern with excellent three-dimensional effect. It is preferable to use a resin binder having such characteristic values because it has the effect of forming a coating film with excellent scratch resistance.

The film characteristics of the resin binder as used in the present invention are defined as follows.

(a) Tensile strength: Strength of the film when the binder film breaks in a tensile test (kg/cm”) (b) Elongation rate: Elongation rate of the film when the binder film reaches breakage in a tensile test (%) (c) 100% stress strength: tensile strength of the binder film when the elongation rate reaches 100% (kg/cm) In addition, the film properties of the resin binder can be determined by applying the binder film using the method (a) below. This is the value obtained by creating a film and testing it under the test conditions (0).

(b) Preparation of binder film: After making the binder into an organic solvent solution with an appropriate organic solvent, the binder solution is flow-coated onto a support such as a glass plate so that the dry film thickness is approximately 200 μm, and the film is formed. Carefully raise the temperature to prevent bubbles from forming inside. For example, heat at 40℃ for 30 minutes → 60℃ for 3 minutes.
0 minutes → 30 minutes at 80℃), dry, and then cure (
For example, at 120° C. for 120 minutes), the film thus obtained is peeled off from the support and cut into 10 mm width pieces to obtain test pieces.

(0) Test Conditions 2 The test piece obtained above was subjected to a tensile test using a Tensilon tensile tester at 20° C. and a tensile speed of 500 mm/min.

As the spherical transparent resin particles that can be used in the present invention, resin particles composed of the same resin as the resin binder described above can be used, but the resin particles do not exist in the form of particles in the resulting coating layer. Since it is essential that it exists, it is necessary that it not be dissolved in the solvent or dispersion medium of the resin binder, and that the pattern on the surface of the base material can be clearly identified through the coating layer and in an embossed state. In order to do this, it is necessary that the resin particles be transparent and spherical.

In addition, the resin particles need to have a particle size in the range of 2 to 20 μm;
If it is smaller than μm, a mere matte coating is formed, and the effect of making the pattern appear three-dimensionally embossed cannot be obtained. On the other hand, if the particle size is larger than 20 μm, the surface of the coating film formed will be rough and the coating film will become white and cloudy, resulting in a disadvantage of lowering the commercial value. Therefore, in the present invention, 75% by weight or more of the resin particles used have a particle size of 5.
A range of .about.15 .mu.m is particularly preferred.

In addition, as the spherical transparent resin particles used in the present invention,
By using resin particles made of a resin having elastic properties equivalent to or better than the film properties of the resin binder, the resulting coating film has the effect of forming an embossed pattern, which is the object of the present invention. It is preferable to use resin particles with such characteristic values because they have excellent scratch resistance and can form a coating film that feels smooth and soft when the coating surface is touched with the hand. .

The paint that can be used in the present invention is made by mixing the resin binder and resin particles in an amount of 0.5 to 3 times the weight of the resin binder. If the amount of particles is less than 0.5 times the amount, the effect of raising the pattern will be small, and the paint film will become too smooth and glossy, and the raised pattern will become unclear due to surface reflection of the paint film. On the other hand, if the amount of resin particles is more than three times the amount, the coating film obtained becomes excessively matte, resulting in problems such as cloudiness and indistinct patterns. Therefore, in the present invention, it is particularly preferable to mix resin particles in an amount of 1.0 to 2.5 times the amount of the resin binder.

The paint used in the present invention can be manufactured by a method commonly used in the paint industry. For example, a resin solution obtained by dissolving a binder resin in an appropriate organic solvent, a resin solution obtained by solution polymerizing monomers constituting the binder resin in an appropriate organic solvent, or an emulsion polymerization of the monomers in water. It can be obtained by uniformly mixing and dispersing a predetermined amount of resin particles in an emulsion resin liquid etc. obtained by doing so. In addition, in this case, various paint additives commonly used in the paint industry, such as ultraviolet absorbers, leveling agents,
Antisettling agents, antifoaming agents, fluidity modifiers, etc. may be added.

Moreover, the above-mentioned paint may be colored using a coloring agent such as a pigment or a dye. In this case, it is preferable to use spherical resin particles that have been colored with a coloring agent in advance, but the method is not limited to this, and it may also be done by adding a coloring agent to the resin binder, or by adding a coloring agent to the resin binder and the resin. Both particles may be colored. However, in any case, the addition of a colorant impairs the transparency of the resulting coating film and tends to reduce the clarity of the pattern on the surface of the substrate. It is preferable to keep the amount within a range that does not have an adverse effect on performance.

The coating method of the present invention uses the paint obtained as described above,
If necessary, it is diluted by adding an appropriate diluent to achieve the appropriate coating viscosity, and then applied to the surface of any base material with a pattern.In this case, the application method is relatively uniform. It is preferable to use a method that allows easy formation of a coating film of a certain thickness, such as spray coating, roll coater coating, curtain flow coater coating, etc. Application methods other than these, such as brush coating and dip coating,
Since it is difficult to form a coating film with a uniform thickness, the arrangement of particles in the coating film tends to be non-uniform, and the raised pattern tends to become non-uniform, so it is not preferred in the present invention.

In the coating method of the present invention, it is necessary to apply the above-mentioned paint so that the dry coating thickness becomes 10 to 50 μm, and particularly preferably 20 to 40 μm. If the coating film thickness is less than 10 μm, the resin particles in the coating film will simply be arranged on the base material surface without overlapping, so the effect of embossing the pattern on the base material surface will not be so great, and the three-dimensional effect will be reduced. It has the disadvantage that it tends to be poor in color, and when the coating thickness becomes thicker than 50 μm, the light reflected from the substrate surface is absorbed into the coating, reducing the clarity of the pattern and making it uneconomical. There are drawbacks.

In the coating method of the present invention, on the patterned surface of a base material having an arbitrary pattern,
It consists of applying a paint having the above-mentioned specific composition to a specific film thickness, and therefore, the coating film formed on the surface of the base material by this method has the above-mentioned specific particle size in the coating film. Since the transparent resin particles are dispersed, the light reflected from the substrate surface is refracted due to the lens effect of the resin particles.
The effect that the pattern of the base material appears three-dimensionally raised can be obtained. In this case, if the resin particles are arranged in multiple layers on the substrate surface, the reflected light from the substrate surface will be refracted more complexly than in a single layer, resulting in poor design. Therefore, in the coating method of the present invention, the resin particles in the coating film are formed in multiple layers overlapping each other, so that a relatively thick film is obtained. It is preferable that the total coating thickness falls within the above-mentioned limited range by applying the coating to the surface of the substrate, or by applying relatively thin coatings multiple times.

Substrates to which the coating method of the present invention can be applied are not particularly limited as long as they have any pattern on their surface; for example, various types of plywood or wooden products with wood grains, printed plywood with any pattern printed on it, etc. , steel plates or other metal plates, and various plastic molded products or metal molded products with arbitrary patterns formed on the surface.Arbitrary patterns include woodgrain, stone spacing, etc., as well as letters, figures, symbols, or these. It is a combination pattern etc. In particular, when the present invention and method are applied to plywood that has wood grains or is printed with wood grains or other arbitrary patterns, the wood grains or arbitrary patterns on the surface of the plywood appear to stand out in three dimensions, resulting in extremely excellent design. It can be made into plywood with high commercial value.

〔Example〕

The present invention will be explained in more detail based on the following examples. In addition, the paint composition in the examples is shown on a weight basis.

Examples 1 to 3 and Comparative Examples 1 and 2 In order to see the difference in pattern embossment due to the difference in the mixing ratio of transparent resin particles and resin binder, resins were prepared according to the respective compositions shown in Table 1 below. The particles, resin binder, and mixed solvent were mixed uniformly, and a curing agent was further added to produce a paint.

Each of the obtained paints was applied by air spray to the surface of printed plywood with a wood grain pattern (35 μm in dry coating thickness).
) and set it horizontally at room temperature for 10 minutes.
It was dried at 70°C for 1 hour.

The embossed state of the wood grain pattern on the obtained painted printed plywood was observed, and the results are also shown in Table 1.

Comparative Examples 3 and 4 Using the paint of Example 2 above, it was applied to a printed plywood in the same manner as in the above Example so that the dry film thickness was 8 μm, and dried to obtain a coated plywood. The appearance of the obtained painted plywood was observed, and the results are shown in Table 1 as Comparative Example 3. In addition, Table 1 shows the observation results of painted plywood coated with a dry coating thickness of 60 μm as Comparative Example 4.
It was shown to.

(Left below) Examples 4 to 6 and Comparative Examples 5 and 6 Using spherical transparent resin particles with different particle sizes, each component was uniformly mixed with the composition shown in 2 below to form each paint. Manufactured.

The paint obtained above was applied by air spray to the surface of the ABS molded base material on which letters were printed so that the dry film thickness was about 30 μm, and dried at room temperature for 1 hour. The printed characters on the obtained coated molded products were observed, and the results are shown in Table 2.

(Left space below) Example 7 Produced according to the method described in Japanese Patent Publication No. 4B-41006 (Example 1), with an average particle diameter of 15 μm,
And its elastic properties have a tensile strength of 250 kg/ct/,
Elongation rate 700%, 100% stress strength 50kg/cn? 15 parts of true spherical polyurethane resin particles, 10 parts of a polyurethane resin having elastic properties as a resin binder with a tensile strength of 250 kg/cm, an elongation rate of 400%, and a film property of 100% stress strength of 25 kg/cm; A paint was produced by uniformly mixing 85 parts of the mixed solvent used in Example-1, and the resulting paint was applied to printed plywood in the same manner as in Example-1.

When we observed the pattern embossment and the smoothness of the painted surface of the above-mentioned painted plywood, we found that a smooth and soft-touch painted surface was formed on the plywood surface. The wood grain pattern was clearly visible, giving it an extremely well-designed appearance.

In addition, when the scratch-resistant inertia of the coating film formed on the plywood surface as described above was evaluated using the evaluation method below, it was found that no traces of nail deviation remained, indicating that the coating was strong and had excellent scratch-resistant inertia. It was a membrane.

Te °ki,
Attach an ABS resin nail to a niraping tester, scratch the coating surface with a load of 500 g, and after leaving it at room temperature for 24 hours, check f1 to see if any nail marks remain.

〔Effect of the invention〕

Since the coating method of the present invention consists of applying a paint having the above-mentioned specific composition, the coating film obtained by this coating method is formed on the surface of the substrate by the spherical transparent resin particles present in the coating film. It is an extremely excellent coating method that has the effect of making any pattern three-dimensionally stand out, and can enhance the design of various substrates with patterns.

Further, the coating method of the present invention may be applied to a coating having wood grain, or
When applied to plywood printed with patterns such as wood grain, the resulting plywood can be seen with the pattern on the plywood surface standing out in three dimensions, making it possible to create plywood with excellent design. It has extremely excellent characteristics.

Claims (4)

[Claims] (1) The surface of the base material having an arbitrary pattern contains 0.5 to 3 times the amount by weight of spherical transparent resin particles, of which 75% by weight or more has a particle diameter in the range of 2 to 20 μm, relative to the resin binder. 1. A method for embossing a pattern on a substrate, characterized in that a paint formed by the above is applied to a dry coating thickness of 10 to 50 μm. (2) The resin binder has a tensile strength of 100 kg/
2. The coating method according to claim 1, wherein the coating has characteristic values such as cm^2 or more, elongation rate of 300% or more, and 100% stress strength of 1/3 or less of the strength at break. (3) The spherical transparent resin particles have a tensile strength of 100 kg.
2. The coating method according to claim 1, which is made of a resin having characteristic values of /cm^2 or more, elongation rate of 300% or more, and 100% stress strength of 1/3 or less of the strength at break. (4) The coating method according to claim 1, wherein the base material having the arbitrary pattern is plywood.