JPH0976699A - Water-based undercoating liquid for leaf - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water-based undercoating liquid for leaf wherein stamping operation of a gold leaf or the like is easy, the gold leaf or the like stuck to a body having the leaf applied is difficult to be peeled off, it is high in water resistance, and does not generate discoloring. SOLUTION: This water-based undercoating liquid for leaf contains emulsion containing water-dispersive resin and water, or contains aqueous solution containing water-soluble resin and water. As the water-dispersed resin, alkoxysilyl group-containing polyurethane resin or hydroxyl group-containing polyurethane resin is preferable. An emulsion containing respectively about 30wt.% of them is used. In the alkoxysilyl group-containing polyurethane resin, main chains are connected to each other in the alkoxysilyl group part, and a crosslinked structure is formed. Further, for the hydroxyl group-containing polyurethane resin, by using isocyanate terminal prepolymer as a hardener, the crosslinked structure is introduced, and a coating of large strength 2 is formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water-based foil lower solution which is easy to push gold foil and the like and is hard to peel off. The underfoil solution of the present invention is a woodwork product coated with cashew resin paint, urethane resin paint, etc., for example, altars and crafts,
Alternatively, it is used for attaching gold foil, silver foil, etc. to the surface of lacquer ware etc. coated with melamine resin paint, phenol resin paint, etc.

[0002]

2. Description of the Related Art A lot of gold leaf is attached to Buddhist altars and the like, but conventionally, the work of attaching the gold leaf has been performed as follows. When the gold foil is to be reattached, the Buddhist altar is first disassembled into respective members, and the resinous oil of lacquer or evergreen cashew is applied to the required portions of these members where the gold foil should be attached. After the application, the coating film is left to stand for a predetermined period of time and dried, and the formed coating film surface is rubbed with cotton, cloth or the like to wipe off a part of the resinous oil to smooth the coating film surface. After that, the gold leaf is allowed to stand on the surface of the film, pressed and adhered, and then each member coated with the gold foil is assembled as before to form a Buddhist altar.

However, the work of wiping off the film made of the resin oil of lacquer and cashew is a heavy labor, occupies a large time weight in the work of sticking the gold leaf, and depends on the experience and skill of the craftsman. is there. Further, since the above-mentioned film is an extremely thin film having a thickness of less than 1 μm, it has a drawback that the gold foil is easily peeled off by contact with other articles after sticking. Therefore, it is necessary to pay close attention to the assembly work after sticking the gold foil to each member, and if the gold foil is peeled off or scratched during the assembly stage, it is necessary to disassemble and restart the work from the beginning. is there.

Urushi and cashew resin oils that have been widely used in the past are not only poor in adhesiveness as described above, but also not water-soluble, but if they are wiped carelessly with a detergent or the like. , The gold leaf may come off. Therefore, the purchaser must also pay close attention to the handling of the foil, and the conventional film has a problem that the foil discolors over time.

The resin oil of lacquer and cashew is usually used by dissolving it in an organic solvent. For example, in the case of cashew-based oil, it is contained in a closed container as a high-concentration solution of about 40% by weight. At the time of use, it is diluted with white gasoline or the like by a factor of about 10 and used. In this way, since a large amount of organic solvent is used in the actual foil stamping work, it has a large impact on human body due to poisoning, anesthetic action, etc. Furthermore, organic solvents, especially white gasoline, etc. are highly flammable and require careful handling. , It is also a cause of environmental pollution due to evaporation.

[0006]

DISCLOSURE OF THE INVENTION The present invention is intended to solve the above-mentioned problems, and by simply applying it to the surface of an adherend,
The purpose of the present invention is to provide a water-based foil lower solution (hereinafter sometimes referred to as foil lower solution) that does not require a work of rubbing a film to be formed and removing a part of the film, and can easily perform a gold stamping operation. To do. The underfoil solution of the present invention is a suitable underfloor solution, particularly when a gold foil is attached to a required part of a structural member such as a main body of a Buddhist altar, a door, etc. Even if it is used and wiped, no problem occurs and it is difficult to discolor.

[0007]

The aqueous foil undercoat liquid of the first invention is characterized by containing an aqueous emulsion containing a water-dispersible resin and water. The water-based foil undercoat liquid of the second invention is characterized in that the water-dispersible resin is an alkoxysilyl group-containing polyurethane resin, and the water-based foil underwater liquid of the fourth invention is characterized in that the water-dispersible resin is a hydroxyl group. It is characterized by containing polyurethane resin. Furthermore, the aqueous foil undercoat liquid of the eighth invention is characterized by containing an aqueous solution containing a water-soluble resin and water.

Examples of the above-mentioned "water-dispersible resin" include polyvinyl acetate, vinyl acetate copolymers such as ethylene-vinyl acetate copolymer, polyvinylidene chloride and its copolymer, polyacrylic acid ester and its copolymer. , Polymethacrylic acid ester and its copolymer, acrylic resin, polyurethane, silicone modified acrylic resin, acrylic acid-styrene copolymer, aromatic polyester and epoxy resin.

The "water-based emulsion" is prepared by suspending or dispersing one or more of the above water-dispersible resins in water. Examples of the composite emulsion containing two or more kinds of resins include an example in which an acrylic resin and polyurethane are used in combination. Further, as the water-dispersible resin used in the present invention, a urethane resin is preferable, and the “alkoxysilyl group-containing polyurethane resin” of the second invention and the “hydroxyl group-containing polyurethane resin” of the fourth invention are particularly preferable. Is.

In the above-mentioned alkoxysilyl group-containing polyurethane resin, the alkoxysilyl group is blocked by water existing in a large amount in the surroundings, so that the storage stability is excellent even with the one-pack type. In addition, a condensation reaction due to a dehydration reaction of an alkoxysilyl group causes -Si between polyurethane main chains.
A crosslinked structure is formed by —O—Si— bond, and an adhesive film having high strength is obtained.

In this "water-based emulsion" containing the alkoxysilyl group-containing polyurethane resin, a resin having a resin concentration of about 30% by weight is usually provided. In this case, the "water-based foil lower solution" is a water-based emulsion and a water-based emulsion. It is preferable that the emulsion is composed of about 2-3 times the amount of water. Therefore, as in the third invention, the alkoxysilyl group-containing polyurethane resin is "5 to 20% by weight" when the amount of the aqueous foil under liquid is 100% by weight. When the amount ratio of this resin is less than 5% by weight, it takes a long time after the under-foil solution is applied to the adherend to be appropriately dried to the extent that the foil-pressing operation is possible. It becomes difficult to obtain a film thickness of about 2 to 3 μm necessary for obtaining the adhesive strength. On the other hand, when the amount ratio of the resin exceeds 20% by weight, the viscosity of the underfoil liquid becomes high and it becomes difficult to handle.

Further, even in the aqueous emulsion containing the above-mentioned hydroxyl group-containing polyurethane resin, the resin concentration is usually 30.
About 10% by weight is provided, and in this case, it is preferable that the aqueous foil lower solution is composed of an aqueous emulsion and about 4 times as much water as the aqueous emulsion. Therefore, as in the fifth aspect of the invention, when the amount of the aqueous foil lower solution is 100% by weight,
The hydroxyl group-containing polyurethane resin is “3 to 12% by weight”. If the upper limit or the lower limit is deviated, the same inconvenience as in the case of the above alkoxysilyl group-containing polyurethane resin occurs.

In the case of the hydroxyl group-containing polyurethane resin, a one-pack type underfoil solution can be used as described above.
The strength is not always sufficient, and as in the sixth invention, it is preferable to use a two-pack type underfoil solution using "isocyanate-terminated prepolymer" as a curing agent. As a result, a crosslinked structure is formed between the polyurethane main chains, and the strength of the film is greatly improved.

Since the two-component type under-foil solution is used by mixing the respective components immediately before use, the stability of the one-component type is not necessary. Nevertheless, it is preferable to use an isocyanate-terminated prepolymer that is stabilized against water, and the weight ratio of the hydroxyl group-containing polyurethane resin and the isocyanate-terminated prepolymer is, as in the seventh invention,
It is preferably set to "1: 0.1-6". It is particularly preferable that the weight ratio is about 1: 0.2 to 4, particularly about 1: 0.2 to 2. When the prepolymer is excessively blended, even if a part of the prepolymer reacts with water, a sufficient amount of the prepolymer is involved in the reaction with the hydroxyl group-containing polyurethane resin.

When the amount ratio of the isocyanate-terminated prepolymer is less than 0.1, the underfoil solution tends to be in a dry state and the adhesiveness tends to be lowered, and the foil may not be adhered to the film with sufficient strength. . On the other hand, if the above amount ratio exceeds 6, the coating becomes soft and the strength decreases, which is not preferable.

In the water-based foil bottom liquid of the eighth invention, "water-soluble resin"
To use. As the water-soluble resin, polyvinyl alcohol, carboxymethyl cellulose, hydroxyethyl cellulose, viscose, polyvinyl pyrrolidone, polyvinyl ether, water-soluble alkyd resin, water-soluble acrylic modified alkyd resin, water-soluble acrylic resin, water-soluble epoxy resin, water-soluble epoxy ester Various materials such as resins may be mentioned. In addition, in the case of this water-soluble resin, if the gold foil surface of the Buddhist altar is wiped off with a detergent or the like, the gold foil may peel off. It is preferable to increase the water resistance of.

In the present invention, in addition to the above water-dispersible resin and water-soluble resin, one or more kinds of various resins such as epoxy resin, xylene resin, phenoxy resin, petroleum resin and terpene resin are blended. It can also be used. By properly blending these resins, the time for which the foil can be attached, that is, the time for which the underfoil is kept in an appropriately dried state can be controlled, and the area of the foil attachment, etc. should be considered. Meanwhile, an appropriate amount of resin may be blended. When these resins are used in combination, a plasticizer is usually added at the same time. As the plasticizer, phthalic acid esters such as dioctyl phthalate, dibutyl phthalate and dilauryl phthalate can be used.

Further, the underfoil solution of the present invention may be mixed with a fatty acid salt, an amine, an organic metal salt or the like to accelerate the drying thereof. Examples of the fatty acid salt include zinc naphthenate, cobalt naphthenate, zinc octenoate, cobalt octenoate, and dibutyltin laurate. Examples of the amine include trimethylamine and dimethylaminoethanolamine, and examples of the organic metal salt include tri-n-butyltin acetate and dibutyltin dilaurate. By mixing these in appropriate amounts, for example, 0.001 to 0.3% by weight, the foil pressing operation can be started in a short time after applying the underfoil solution to the adherend.

A foil, for example, a gold foil, is very thin (2 to 3 μm) and has innumerable through holes on its entire surface. When the foil is gently placed on the film, air, moisture, etc. are dissipated to the outside from the through holes. As the foil sinks into the film and adheres to it (this phenomenon is called suction), the surface becomes smooth, and as the film cures, it adheres firmly to the adherend. On the other hand, the fluid under the foil has different fluidity in the time zone during which the foil pressing operation can be performed, depending on the solid content, the type of solid content other than the main component, and the amount thereof.

If the fluidity is high, the solid content of the underfoil liquid enters the through holes of the foil together with the residual water, and the appearance of the finished surface of the foil is affected to a large extent, and the finished surface becomes matte. When the fluidity is low, solids and the like do not enter the through holes of the foil, and the appearance of the finished surface is not affected by the foil, resulting in a very glossy finished surface. Further, even with the same underfoil solution, since the drying gradually progresses within the time that can be applied and the fluidity decreases,
If the foil pressing operation is started after a long time has passed after the underfoil solution has been applied, the underfoil solution becomes difficult to absorb the foil, and a finished surface with more excellent gloss can be obtained.

The underfoil solution of the present invention has a relatively small solid content and contains a large amount of water. However, since the thickness of the under-foil solution applied to the adherend is very thin, most of the water dissipates in a few minutes to at most 30 minutes even at room temperature (for example, 25 to 35 ° C.), and The film is dried to the extent that it can be attached. Then, from this point, the foil pressing operation is carried out until the foil cannot be attached due to the progress of drying and curing, and usually several hours, for example, 5 to 6 hours after the application of the underfoil solution.

When the fluidity of the underfoil is high and the drying is slow, the suction of the foil is good. However, it takes a long time before the foil can be pressed, and it takes a long time until the film is in a dry state to the extent that the foil can be wiped, which will be described later, and the workability is deteriorated. If it dries more slowly and is easier to suck in, the solid content of the bottom solution of the foil will enter the through holes of the foil above the overlapping part of the seams of the foil, making it difficult to wipe the foil, forcing the foil. Even if you pay
A linear step is formed in that portion, and the appearance of the finished surface becomes poor.

As the underfoil solution, it is ideal that it can be foil-pressed in a short time after application and has no significant change in fluidity within the time after which it can be foil-pressed, and can be completely cured rapidly at the end of the foil-pressing operation. is there. Although it is difficult to prepare an underfoil solution that exhibits such a behavior completely, the underfoil solution of the present invention tends to exhibit the above-described behavior relatively, and particularly in the two-component type, the amounts of the main agent and the curing agent are large. It is relatively easy to adjust the behavior by changing the ratio or the like.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be specifically described below with reference to Examples. Moreover, the repair of the gold leaf of the altar, which was performed using the underfoil solution of the example, will be described. FIG. 1 is a perspective view of a Buddhist altar that has been reassembled after disassembling the constituent members to repair the gold leaf. FIG. 2 is a cross-sectional view showing the correlation between the adherend, the film formed by the underfoil solution of the present invention, and the gold foil attached to the surface thereof. FIG. 3 is an enlarged view of FIG. Further, FIG. 4 is an enlarged cross-sectional view showing a state in which a part of the film enters the bottom portion of the through hole of the foil.

Reference numeral 1 represents an adherend having a flat outer surface. Specifically, the flat part 11 inside the front of the altar, the door 12, the back 13
And so on. A film 2 made of underfoil was formed on the surface of these adherends 1. It should be noted that the adherend 1 is a veneer plate, or in a high-grade product, a cypress material is coated with a saw, a base material is applied on the saw, dried and then polished, and a black cashew-based paint or urethane-based coating is applied on the saw. It is applied with paint. The black glossy coating surface has a sufficient commercial value as it is, and in fact, in many Buddhist altars, this coating surface directly constitutes the outer surface.

Example 1 As a foil bottom liquid, an alkoxysilyl group-containing polyurethane emulsion (Takelac XW-75-X09, manufactured by Takeda Pharmaceutical Co., Ltd., solid content: 30% by weight) 1
00 parts by weight (hereinafter referred to as "part"), water 200 to 300
One-part type consisting of parts and a small amount of surface conditioning aid was used.

Using this underfoil solution, the gold foil was attached to the disassembled altar members as follows. Adherend 1
After cleaning the surface thereof with a cleaning agent or the like, the above-mentioned underfoil solution was spray-coated on this surface so that the thickness of the coating film when dried to such an extent that the foil pressing operation would be about 2 to 3 μm. The underfoil solution may be applied by spraying, cotton, cloth, brush or the like.

The set time of the applied underfoil solution (the time until it is dried to the extent that foil pressing is possible) varies depending on the amount ratio of water in the underfoil solution, but when 200 parts of water is about 5 minutes With 300 parts of water, it took about 10 minutes. After the elapse of this set time, a gold foil 3 having an 11 cm square and a thickness of 2 to 3 μm was gently placed on the film 2 formed by drying the underfoil solution. The time during which the foil pressing operation can be performed is about 6 hours after the application of the underfoil solution, and then the film 2 reacts and cures so that the foil cannot be attached.
It took about 72 hours to completely cure the film 2.

The gold foil is usually 11 cm as described above.
Square ones are provided, which are sequentially arranged on the surface of the adherend to be finished. Therefore, even a skilled craftsman cannot completely eliminate the overlap between adjacent gold foils, and properly remove the foil while taking into consideration the dry state of the film (work to remove the foil on the upper surface side of the foil overlap with cotton etc.). ). If this foil wiping is performed in a state where the film is not sufficiently dried, scratches will remain on the finished surface of the gold foil, so it is necessary to exercise caution. If the surface of the gold foil or the seams have irregularities, it can be smoothed by pressing the portion with cotton or the like before the film is sufficiently cured.

The surface of the gold foil adhered as described above is smooth, and the film formed from the underfoil solution of Example 1 dries quickly and the fluidity decreases at a relatively early stage.
A part of the coating did not penetrate into the through holes of the gold foil, resulting in a finished surface with excellent gloss. And, the adherend and the film, the interface between the film and the gold foil are firmly adhered,
During the assembly work of the Buddhist altar, the gold foil did not peel off with some external force, so the assembly work proceeded smoothly. Furthermore, the gold foil does not peel off even if it touches or rubs the assembled altar, and even if it is wiped with a detergent etc., the film dissolves and deteriorates, the gold foil is scratched, and it falls off. There was no need to do it, and the purchaser of the altar did not have to worry about handling it as before.

Further, in the case of a film made of a resinous oil such as cashew, which has been widely used in the past, the resinous oil passes through the through-holes of the gold foil at the time of sticking, particularly when the foil is pressed against the film relatively strongly. Since it oozes out onto the finished surface, wiping work was essential. However, with the underfoil solution of this example, solids and the like hardly ooze out onto the finished surface of the gold foil, and there was no need to rub the surface of the film to wipe off part of the film. This wiping work is a heavy labor, and it can be understood that this work is not necessary and the excellent performance of the underfoil solution of the present invention is combined with the excellent water resistance and adhesiveness.

Example 2 Hydroxyl group-containing polyurethane emulsion (trade name "Takelac AC", manufactured by Takeda Pharmaceutical Co., Ltd., was used as a foil bottom liquid.
W-31H ", solid content; 30% by weight) 100 parts by weight (hereinafter referred to as" part "), water 400 parts, curing agent (isocyanate-terminated prepolymer, manufactured by Takeda Pharmaceutical Co., Ltd., trade name" Takenate NW- (4. ) ”, Solid content; 100% by weight) 80 to 100 parts, and a small amount of a surface conditioning aid were used. In this example, the amount ratio of the hydroxyl group-containing polyurethane resin and the isocyanate-terminated prepolymer is about 1: 3, and the prepolymer ratio is high. Therefore, although the film has a slightly small hardness, the amount ratio of the prepolymer may be appropriately reduced without checking the adhesion state of the gold foil and the like.

Using this underfoil solution, in the same manner as in the case of the underfoil solution of Example 1, gold foil was attached to the members of the altar. The set time of the underfoil solution varies depending on the amount ratio (relative water amount ratio) of the curing agent in the underfoil solution, but is about 10 minutes for 80 parts of the curing agent and 20 minutes for 100 parts of the curing agent.
It was about. In addition, the time during which the foil pressing operation was possible was between the application of the underfoil solution and the lapse of about 5 hours. After that, the film reacts and cures so that the foil cannot be attached.
It took about 72 hours to completely cure the film.

In this example, the gold foil was applied in the same manner as in Example 1 while taking into consideration the difference in the behavior of the underfoil solution. As a result, similarly to the case of the underfoil solution of Example 1, it was possible to obtain a finished surface excellent in water resistance, adhesiveness, etc., without the need to wipe off the film. In addition, in the underfoil liquid of this Example 2 and the film 2 formed thereby, the fluidity is higher than that of Example 1 in the whole working process, so that the gold foil 3 is sucked in well and a part of the film is formed. Had entered the bottom of the through hole 31 of the gold foil 3. for that reason,
The finished surface has become matte, giving the Buddhist altar an astringent and profound appearance.

In each of the above-mentioned Examples 1 and 2, the strength of the film is sufficient, but a resin having a large average molecular weight,
Alternatively, the strength can be further increased by using a resin having a high glass transition point. In particular, in the case of the two-pack type of Example 2, the polyurethane resin as the main component has sufficient strength, but the curing agent has a relatively low molecular weight and a low glass transition point. Moreover, the curing agent is NCO / O
Since more than the same amount is used in the H ratio, in this two-liquid type,
Particularly, it is preferable to use a polyurethane resin having a high molecular weight and a high glass transition point.

The present invention is not limited to the specific embodiments described above, but may be variously modified within the scope of the present invention depending on the purpose and application. The above examples are examples in which the underfoil solution of the present invention was used for sticking gold leaf to a Buddhist altar, but in addition to this, various ornaments such as sculptures, candlesticks, shrines and temples, etc. It can also be applied to sticking gold leaf and the like. The material of the adherend is not particularly limited, and any material such as wood, plastic, metal and ceramic can be used.

[0037]

EFFECT OF THE INVENTION Unlike the conventional cashew-based foil slurries, the water-based foil syrup of the first invention does not require the work of cleaning the coating surface after application to an adherend, and the work of stamping gold foil or the like is unnecessary. Easy,
Moreover, the gold foil once applied does not peel off even when wiped with a detergent or the like, and does not discolor. In addition, even though it is water-based, even if it is applied to the surface of a Buddhist altar cashew-based or urethane-based resin coating film, it has no repellency, has excellent wettability, and uses almost no organic solvent. It does not cause any problems such as adverse effects on the human body or environmental pollution.

Further, a water-dispersible resin such as the alkoxysilyl group-containing polyurethane resin of the second invention or the hydroxyl group-containing polyurethane resin of the fourth invention is contained in an amount ratio specified in the third invention or the fifth invention, respectively. By doing so, it is possible to obtain an underfoil solution with more excellent performance. In addition, when the hydroxyl group-containing polyurethane resin of the fourth invention is used, by using the isocyanate-terminated prepolymer of the sixth invention as a curing agent in an amount ratio specified in the seventh invention, a film having higher strength can be obtained. can do. Even with the water-soluble resin of the eighth invention, a film having high strength can be formed although the water resistance is reduced.

[Brief description of drawings]

FIG. 1 is a perspective view of an entire Buddhist altar on which a gold foil is attached using the aqueous foil bottom solution of the present invention.

FIG. 2 is a cross-sectional view showing the correlation between an adherend, a film composed of an underfoil solution, and a gold foil.

FIG. 3 is an enlarged cross-sectional view showing the correlation between an adherend, a film composed of an underfoil and a gold foil.

FIG. 4 is an enlarged cross-sectional view showing the correlation between a coating made of an adherend and the underfoil and a gold foil when a part of the coating enters a through hole of the gold foil.

[Explanation of symbols]

1; an adherend, 2: a film composed of an aqueous foil lower solution, 3: gold foil,
31; Through hole of gold leaf.

Claims (8)

[Claims] 1. A water-based foil under liquid containing an aqueous emulsion containing a water-dispersible resin and water. 2. The aqueous foil bottom solution according to claim 1, wherein the water-dispersible resin is an alkoxysilyl group-containing polyurethane resin. 3. The aqueous foil undercoat liquid according to claim 2, wherein the alkoxysilyl group-containing polyurethane resin is 5 to 20% by weight when the aqueous foil underwater liquid is 100% by weight. 4. The aqueous foil bottom solution according to claim 1, wherein the water-dispersible resin is a hydroxyl group-containing polyurethane resin. 5. The aqueous foil bottom solution according to claim 4, wherein the hydroxyl group-containing polyurethane resin is 3 to 12% by weight based on 100% by weight of the aqueous bottom foil solution. 6. The aqueous foil bottom solution according to claim 4, wherein the aqueous foil bottom solution further contains an isocyanate-terminated prepolymer. 7. The weight ratio of the hydroxyl group-containing polyurethane resin to the isocyanate-terminated prepolymer is 1:
The aqueous foil bottom solution according to claim 6, which is 0.1 to 6. 8. An aqueous underfoil solution, which contains an aqueous solution containing a water-soluble resin and water.