JP2009183903A - Method for applying japanese lacquer on surface of glass and pottery by hardening at room temperature - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for applying Japanese lacquer having high adhesion with high durability on the surface of glass and pottery without impairing the texture in appearance by hardening it at a normal temperature, so that such problems are solved that when the Japanese lacquer is hardened at the normal temperature, no adhesiveness is caused on the glass and pottery, thereby baking coating has been performed to stick the Japanese lacquer to a base material conventionally, however, when the Japanese lacquer is baked and hardened, the glossiness and reflectance of a coating rises, thereby the graceful appearance of the coating which the Japanese lacquer has is spoiled. <P>SOLUTION: An isocyanate-based silane coupling agent is mixed with Japanese lacquer to paint, thereby applying strong adhesion to the base material by hardening it at a normal temperature in the normal hardening atmosphere of the Japanese lacquer without applying a special treatment on the surface of the glass and the pottery and without applying baking coating of the Japanese lacquer thereon. Therefore, coating of the Japanese lacquer without impairing the texture in the appearance and the texture of moist which the Japanese lacquer has can be performed. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to a lacquer coating having a highly durable adhesive force on the surface of glass and ceramics and a method of decorating with lacquer.

Lacquer is a sap that is secreted by a water-in-oil emulsion when scratched on the bark of the genus Ursiaceae, and is hardened by drying at room temperature. Since ancient times, it has been widely used as a natural paint.

Lacquer, which is a natural paint, has high film properties comparable to synthetic resin paints, and has a unique sensory and elegant paint film appearance and a moist texture that cannot be obtained with synthetic resin paints.

Such lacquer has been used mainly for lacquerware production, furniture, wood painting for Buddhist ware production, etc., as well as for baking painting on metals such as armor, harness, jewelry.

Armor, such as armor, is baked and painted mainly for the purpose of preventing rust, and metal jewelry is decorated with lacquered lacquer coating as a primer, and decorated with lacquer painting, gold leaf, silver leaf, etc. It was baked for the purpose of applying.

Urushiol (60-70%), water (20-35%), water-soluble polysaccharide (5-10%), glycoprotein (1-5%), enzyme laccase (approximately 0.2 %), And lacquer is cured and formed by enzymatic oxidation of laccase.

The optimal condition for the lacquer curing atmosphere with laccase is 15 to 25 ° C / 65 to 85% RH, which hardly hardens at temperatures below 4 ° C and above 40 ° C, but is baked by applying a high temperature above 80 ° C. Is possible.

Bake coating at high temperature improves the physical properties of the coating, such as adhesion to the substrate, hardness, and water resistance. On the other hand, the reaction form leading to curing film formation differs from room temperature curing, which begins with the enzyme reaction of laccase. The appearance texture, elegance, and moist texture that are characteristic of this are impaired, and gloss and reflectivity are increased.

Conventional lacquer coatings on glass and ceramics have been applied with the above-mentioned baking coating because they cannot be adhered to the base material at room temperature curing. In addition, since the texture of the lacquer film was lost, it was not so common to paint lacquer on glass or ceramics.

When the adhesion of a paint film coated with lacquer on glass or ceramics and cured at room temperature is evaluated by the cross-cut tape method, the adhesion is so weak that the paint film peels off more than the part where the tape is applied. is there.

Patent Publication 6-107435 Patent Publication 10-194782 Patent Publication 11-226490

Various disclosures have already been seen as methods for solving this adhesion problem. For example, Japanese Patent Publication No. 6-107435 “Glass Interior Products and Manufacturing Method Therefor” discloses a method of coating lacquer on glass indirectly through a silicone acrylic resin.

In addition, Japanese Patent Publication No. 10-194782 “Glass products with lacquer decoration” discloses a measure to ensure adhesion by applying sand blasting to the glass surface and painting lacquer mixed with a silane coupling agent. Yes.

However, in both of these inventions, for example, when painted on transparent glass, the silicone acrylic resin primer layer and the sandblasting process are exposed when viewed from the opposite side of the painted surface, and the design in product production is large. There is a problem of being restricted and it is difficult to develop various products.

In addition, according to Japanese Patent Publication No. 11-226490 “Method of coating lacquer on the surface of glass or ceramics”, the cleaned substrate is immersed in a 10% NaOH aqueous solution at 60 ° C. as a pretreatment to make it hydrophilic, A coating method is disclosed in which a silane coupling agent such as γ-aminopropyltriethoxysilane or γ-glycidoxypropyltrimethoxysilane is baked and coated, and then lacquer is baked and coated after the substrate temperature cools.

Furthermore, in the same invention, a method is also proposed in which the silane coupling agent shown above is mixed with lacquer and this is baked in the same manner.

However, in any case, in the present invention, the lacquer coating is always premised on baking.

For this reason, the lacquer film obtained in the painting process according to the present invention has an appearance unique to the lacquer film, which is obtained by enzymatic reaction curing of laccase like a wooden lacquer, even if it has adhesion to glass and ceramic base materials. It is not possible to obtain a natural texture, elegance and moist texture.

Furthermore, the invention involves a complicated painting process, and there is a danger in handling a strong alkaline aqueous solution used for pretreatment, and it is necessary to introduce equipment such as a thermostatic bath and a dryer to perform baking coating. It must be said that the introduction is very limited.

Therefore, the present invention has been made to solve the above-mentioned problems of the prior art, and the object is to have a highly durable adhesive force on the surface of glass and ceramics, and also a lacquer film It is to realize a method of applying lacquer coating that does not impair the external texture and texture.

In order to achieve the above object, in the “method for coating lacquer on glass and ceramic surfaces by room temperature curing” of the present invention, the isocyanate and silane coupling agent is mixed with the lacquer to be coated into glass and ceramic. On the other hand, lacquer coating with strong adhesion was realized.

As a result, a lacquer coating has been realized which has a strong adhesion to glass and ceramics at room temperature curing, which has been impossible in the past, and also has a aesthetic appearance and a moist texture specific to a lacquer film.

This is because the so-called normal temperature curing at the same temperature and humidity as the normal lacquer curing atmosphere is realized, and the appearance and moist texture peculiar to the lacquer film is damaged like the traditional lacquer baking coating. This is because it never happens.

Therefore, by using the lacquer coating process in the present invention, a sensual and graceful lacquer film can be applied to the surfaces of glass and ceramics, similar to that of wooden lacquer.

Furthermore, in the painting process according to the present invention, it is not necessary to use a silicone acrylic resin as a primer or to perform sand blasting on the glass itself, so the process is safe and simple, and more designs are realized in product production. Can be made.

Moreover, since there is no need to bake lacquer, it is not necessary to introduce equipment such as a thermostatic bath or a dryer.

And sagging prevention property can also be improved by increasing the addition amount of the isocyanate type silane coupling agent mixed with lacquer in the painting process concerning this invention compared with the lacquer of the same viscosity.

Furthermore, lacquer mixed with an isocyanate-based silane coupling agent can be applied repeatedly, and the interphase adhesion between these lacquers or lacquer without mixing this lacquer with an isocyanate-based silane coupling agent is good. is there.

If it does in this way, in addition to the durability of the coating film being improved, the effect of reinforcing glass or ceramics itself with a lacquer coating film is also improved.

In addition, by applying it repeatedly, it becomes possible to apply lacquers and decorate it with lacquer work, thereby realizing a product with higher design.

Here, the best mode for carrying out the lacquer coating process according to the present invention will be described.

First, oils such as fingerprints adhering to the surface of the glass to be painted and the ceramic base material, dust, etc. are wiped off with a solvent (degreasing). For this degreasing, for example, a low boiling point solvent such as isopropyl alcohol or ethanol may be used as long as it is a solvent that volatilizes quickly after degreasing.

If the substrate is very dirty, it may be polished and washed with a cerium oxide abrasive before degreasing.

Next, 0.5 to 20% by weight of an isocyanate-based silane coupling agent is mixed with the lacquer to be coated, and this is applied using a brush, a spray, or other coating equipment.

As the lacquer used here, all of them are defined by the former Nippon Seiki Lacquer Industry Cooperative Association. , Rashiji lacquer.

And to these lacquers, additives and solvents traditionally mixed with lacquer, such as drying oil, rosin, gunborg, pigments, metal powders, and dispersants, antifoaming agents, to the extent that they do not impair the effects of the present invention , Surface conditioner, leveling agent, viscosity modifier, film-forming aid, sagging inhibitor, anti-settling agent, matting agent, coupling agent, photoinitiator, curing accelerator, polymerization inhibitor, ultraviolet absorber, silica Further, paint additives such as talc and alumina and fillers can be mixed.

The isocyanate-based silane coupling agent described above includes γ-isocyanatopropyltriethoxysilane represented by the formula OCNCH ₂ CH ₂ CH ₂ Si (OCH ₂ CH ₃ ) ₃ or the formula OCNCH ₂ CH ₂ CH ₂ Si. By using a material having an isocyanate group such as γ-isocyanatopropyltrimethoxysilane represented by (OCH ₃ ) ₃ , adhesion to glass or ceramics can be obtained.

Then, the lacquer coated as described above is cured at room temperature. As mentioned earlier, the optimal conditions for curing the lacquer film are 15 to 25 ° C and 65 to 85% humidity. It is known that 3 to 1 week is required for 4 to 6 hours to completely cure.

In the process related to the curing, a drying chamber such as a “lacquer room” or a “rotation room” can be used as in the case of traditional lacquer painting.

Float glass is degreased using isopropyl alcohol, and lacquer mixed with 2% by weight of γ-isocyanatopropyltriethoxysilane and non-mixed lacquer on this base and 50 μm applicator. Painted with.

These were cured at room temperature in an environment of 20 to 25 ° C./60±5% RH for 12 hours, and then cured in an environment of 20 to 25 ° C./70 to 80% RH for 5 days. As a result of evaluating the adhesion of the resulting lacquer coating film by the cross-cut tape method, the lacquer coating film not mixed with γ-isocyanatopropyltriethoxysilane was easily peeled off, but 2% by weight was added. The lacquer coating film according to the present invention had no peeling and good adhesion.

Pervious oil refined lacquer was mixed with vermilion organic pigment at a weight ratio of 8: 2, and 1.6% by weight of γ-isocyanatopropyltriethoxysilane was further mixed with the kneaded lacquer. Mixed with vermilion lacquer.

After painting this vermilion lacquer on the surface of a glass cup degreased with isopropyl alcohol using a lacquer brush and curing it at 20-25 ° C / 60 ± 5% RH for 12 hours at room temperature, 20-25 ° C / 70 Cured for 5 days in ~ 80% RH environment.

The glass cup with lacquer coating according to the present invention thus obtained is subjected to a hot water test and a boiling water test, respectively, and a coating film before and after the hot water and boiling water tests are conducted by the cross-cut tape method. The peeling situation of was compared.

First, the warm water test here is a process in which a glass cup coated in 80 ° C. hot water is immersed for 4 hours and then dried at 80 ° C. for 4 hours, and this is repeated 3 cycles. However, there was no peeling of the coating film before and after the hot water test, and good adhesion was confirmed.

In the boiling water test, a coated glass cup is immersed in boiling water for 1 hour and then dried at 80 ° C. for 1 hour. In this test, both before and after the coating, The adhesion to the base material in the coating process according to the present invention was confirmed.

In order to confirm that the lacquer coating film obtained in the lacquer coating process according to the present invention has adhesion to glass and ceramics, but does not impair the appearance characteristics peculiar to the lacquer film, (Sample A) to (Sample C) were prepared, and their gloss, color difference and reflectance were measured and compared.

(Sample A) is a slide glass degreased with isopropyl alcohol and black oil refined lacquer coated with a 50 μm applicator.

(Sample B) is a slide glass degreased with isopropyl alcohol, mixed with 2% by weight of γ-isocyanatopropyltriethoxysilane with respect to black oil refined lacquer and coated with a 50 μm applicator.

The lacquers painted in (Sample A) and (Sample B) are both cured at room temperature in an environment of 20-25 ° C / 60 ± 5% RH for 12 hours, and then 20-25 ° C / 70-80% RH. For 5 days.

(Sample C) is a glass slide degreased with isopropyl alcohol and black oleo-purified lacquer coated with a 50 μm applicator and then baked and cured at 150 ° C. for 2 hours.

Figure 1 is a list showing the gloss (60 °) and colorimetric data of (Sample A) to (Sample C), and the color difference (ΔE) based on (Sample A). The baked coating (Sample C) shows a gloss increase of about 20 compared to (Sample A), and the color difference (ΔE) is slightly larger at 1.25. On the other hand, (Sample B) according to the present invention has almost no difference from lacquer coated as it is (Sample A) in both gloss and color difference.

Figure 2 is a graph of the reflectance of (Sample A) to (Sample C) measured using a spectrophotometer. The reflectance of (Sample C) is compared with that of (Sample A) and (Sample B). It can be seen that it protrudes and rises. On the other hand, the reflectance of (Sample B) according to the present invention exhibits the same characteristics as those of (Sample A), and the numerical difference is very small.

In addition, although there is no difference in appearance between (Sample A) and (Sample B) by visual inspection, the gloss is remarkably increased in the case of baking (Sample C), and the texture of the coating film. It was clear that was changing.

By applying lacquer to the surface of glass and ceramics in a painting process at the same temperature and humidity as normal lacquer curing atmosphere, a sensual and elegant lacquer film similar to that of wooden lacquer ware is used for glass tableware, etc. Can be painted on. As a result, it is possible to easily produce glassware with high design and lacquer painting and lacquer painting, as well as ceramics.

10 is a list showing the gloss (60 °) and colorimetric data of (Sample A) to (Sample C) and the color difference (ΔE) based on (Sample A). It is the graph which measured the reflectance of (sample A)-(sample C) using the spectrophotometer.

Claims (3)

A lacquer coating method characterized by coating lacquer mixed with an isocyanate-based silane coupling agent on the surface of glass and ceramics and curing it at 4 to 40 ° C. at normal temperature and pressure. 2. The lacquer coating method according to claim 1, wherein the lacquer before painting is a step in which drying oil, rosin, gunborg, pigment, metal powder or a combination thereof is mixed in advance. Applying lacquer using the method of claims 1 and 2, or applying metal powder or dry lacquer powder to the applied lacquer, or applying metal foil, etc. Lacquer painting method characterized by decorating with decoration and lacquer painting, dry lacquer powder, and metal foil.