JPH09316385A - Water-base colored stain composition for porous member, ultraviolet-curable coating composition, and coating method using them - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a coating film which is hardly accompanied by blisters or grittiness and is excellent in adhesive properties, smoothness, and crack resistance even when formed on a porous member and to provide a water-base colored stain compsn., an ultraviolet-curable coating compsn., and a coating method using them to accomplish the above-mentioned purpose. SOLUTION: This water-base colored stain compsn. for a porous member contains a colored pigment or dye, a water-soluble or -dispersible resin, and gypsum. This ultraviolet-curable coating compsn. contains an ultraviolet-curable resin and a water-absorbing agent. This method for coating a porous member comprises applying, to a porous member, a water-base colored stain compsn. contg. a coloring pigment or dye, a water-soluble or -dispersible resin, and gypsum and an ultraviolet-curable coating compsn. contg. an ultraviolet-curable resin and a water-absorbing agent, each at least once in an arbitrary order.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a water-based colored stain composition for a porous member, an ultraviolet-curable coating composition and a coating method using the same, and more specifically, adhesion to a porous member such as a wood material. The present invention relates to a water-based colored stain composition for a porous member, which is capable of forming a coating film excellent in smoothness and smoothness, an ultraviolet-curable coating composition, and a coating method for a porous member using these coating materials.

[0002]

2. Description of the Related Art Conventionally, in painting wood and the like, in order to utilize the wood grain pattern and increase the durability of the material, a colored stain paint and an ultraviolet curable paint are combined. .

Colored stains include oil-based stains and water-based stains. Among these, pigment-based oil stains are often used because they are less likely to cause uneven coloring and have good weather resistance.

However, in recent years, countermeasures against environmental pollution have come to be particularly important, and instead of the oily colored stain, a coloring pigment or dye and a water-dilutable resin are contained as main components. Colored stains are beginning to be used.

By the way, since the wood or the like to which the colored stain is applied is porous, when the aqueous colored stain is applied to the conduit portion of the wood, it permeates deep into the conduit, and as a result,
The applied aqueous colored stain tends to be insufficiently dried.

For this reason, when the wood surface coated with the water-based colored stain is overcoated with, for example, a UV-curable paint and then irradiated with UV light, blurring or roughening of the conduit easily occurs, and the coating film adheres to the wood surface. There is a problem that the resistance and crack resistance tend to be insufficient.

[0007] For example, Japanese Patent Laid-Open No. 6-207133 discloses that "a water-based coloring stain in which a coloring pigment or a dye is dispersed is used as a coloring agent in coloring mainly the pores of a material having a porous portion on the surface. A method for coloring a porous material "is disclosed. However, after the surface coating of wood or the like by the method described in the publication, when the above-mentioned UV-curable coating material is overcoated and irradiated with UV rays, as described above, eye blindness or roughness is likely to occur, and the coating film There was a problem that the adhesion to the wood surface and crack resistance were insufficient.

[0008]

SUMMARY OF THE INVENTION The present invention is intended to solve the problems associated with the prior art as described above. For example, even if a porous member is coated, eye bleeding or roughness does not easily occur, and the adhesion is excellent. Moreover, a water-based colored stain composition for a porous member capable of forming a coating film having excellent smoothness and also excellent in crack resistance, an ultraviolet curable coating composition and a porous material using these coatings The purpose is to provide a painting method.

[0009]

SUMMARY OF THE INVENTION The aqueous colored stain composition for a porous member according to the present invention is characterized by containing a coloring pigment or dye, a water-soluble or water-dispersible resin, and gypsum.

The ultraviolet curable coating composition according to the present invention is
It is characterized by containing an ultraviolet curable resin and a water absorbing agent. The coating method of the porous member according to the present invention is (i) a color pigment or a dye, a water-soluble or water-dispersible resin,
A water-based colored stain composition for a porous member containing gypsum and (ii) an ultraviolet-curable coating composition containing an ultraviolet-curable resin and a water-absorbing agent are applied one or more times in any order. It is characterized by that.

The aqueous colored stain composition for a porous member or the ultraviolet-curable coating composition according to the present invention can be applied to a porous material such as wood and cement products (eg, slate, concrete block). It is possible to form a coating film that is less likely to cause eye blurring and graininess, is excellent in adhesion and smoothness, and is also excellent in crack resistance. In particular, when the aqueous colored stain composition for a porous member and the ultraviolet curable coating composition are applied to a porous material by the method as described above, the adhesion, smoothness, and crack resistance as described above are excellent, A stain-free coating film can be formed on the surface of the porous material.

[0012]

DETAILED DESCRIPTION OF THE INVENTION The aqueous colored stain composition for a porous member, the ultraviolet curable coating composition and the coating method using these according to the present invention will be specifically described below.

[Aqueous colored stain composition for porous member]
The aqueous colored stain composition for a porous member according to the present invention (aqueous colored stain composition) is a color pigment or a dye, a water-soluble or water-dispersible resin (also referred to as a water-dilutable resin or an aqueous resin), and gypsum. Contains and.

Such an aqueous colored stain composition forms a coating film which is less likely to cause blurring and graininess even when applied to a porous material, has excellent adhesion and smoothness, and is also excellent in crack resistance. it can.

As the coloring pigment or dye, conventionally known ones can be used, and any of organic, inorganic, natural and synthetic products can be used, or a combination thereof can be used. Water-soluble or water-dispersible resin (aqueous resin) Water-soluble or water-dispersible resin (collectively both are also referred to as "aqueous resin" ) may or may not have a hydrophilic group. The curing (drying) type is not particularly limited, and may be, for example, a room temperature curing type, a heat curing type, or a light (eg, ultraviolet) curing type, or a one-component curing type, a two-component curing type. Can be of any type,
Among them, the use of an ultraviolet curable resin is particularly effective in shortening the coating / curing time by the rapid curing treatment and improving the blurring and roughness of the porous member.

Examples of such water-based resin include acrylic resin, urethane resin, polyester resin, epoxy resin, vinyl acetate resin, polyvinyl alcohol resin and the like. Further, these aqueous resins may have a polymerizable unsaturated bond (eg carbon / carbon double bond) as described below.

Among these aqueous resins, those having a hydrophilic group such as a hydroxyl group (—OH), a carboxyl group (—COOH), an amino group (—NH ₂ ) and the like are used with an emulsifier or a dispersant. It can be dissolved or dispersed in water (or the aqueous colored stain composition) as it is, but in the case of a resin having no hydrophilic group, it can be emulsified and dispersed by using an emulsifier or a dispersant together.

These aqueous resins may be those which can be dried and cured at room temperature or under heating as described above, or those which can be cured by irradiation with ultraviolet rays (ultraviolet curing type), but in the case of ultraviolet curing type. It is desirable that a cross-linking agent such as a monomer having a polymerizable unsaturated bond is added to the aqueous colored stain composition.

An aqueous colored stain composition containing an ultraviolet-curable aqueous resin (ultraviolet-curable prepolymer) is particularly effective for shortening the process / work period and improving the blurring of eyes and graininess. In the curable aqueous colored stain composition, in addition to the above-mentioned colored pigment or dye, gypsum, and the following polymerizable unsaturated bond-containing resin that is also an aqueous resin and an ultraviolet curable resin, a polymerizable unsaturated bond It is preferable that a monomer having ## STR3 ## and a photoinitiator (also referred to as a photoreaction initiator or a photosensitizer) are included.

Examples of such a resin containing a polymerizable unsaturated bond include those which are cured by radical polymerization such as a resin having an active double bond such as an acrylic group and a vinyl group, and a cation such as a resin containing an epoxy group. There are those that are cured by polymerization, those that are cured by the addition reaction of a thiol group and a double bond group, and such resins include unsaturated polyester resins, polyester acrylate resins, urethane acrylate resins, and epoxies. Acrylate resin and the like can be mentioned.

The number average molecular weight of these unsaturated bond-containing resins is not particularly limited, but it is about 1000 to 100,
000 (100,000) is preferable, and it is preferable that a polymerizable unsaturated bond (eg, carbon-carbon double bond) is present in one molecule, preferably two or more.

As the monomer having a polymerizable unsaturated bond, a compound having a molecular weight of 1,000 or less and having one or more polymerizable unsaturated bonds in one molecule is usually used. For example, N-vinylpyrrolidone, 2-
Ethylhexyl acrylate, styrene, phenoxyethyl acrylate, isobornyl acrylate, 1,6-
Hexanediol diacrylate, tripropylene glycol diacrylate, neopentyl glycol diacrylate, diethylene glycol diacrylate, triethylene glycol diacrylate, polyethylene glycol diacrylate, trimethylolpropane triacrylate, pentaerythritol triacrylate and the like can be mentioned.

These monomers can be used alone or in combination of two or more. Examples of the photoreaction initiator (photosensitizer) include benzoin, benzoin ethyl ether, benzoin isopropyl ether, benzophenone, and benzyl dimethyl ketal. These photoreaction initiators are used alone or in combination of two or more. be able to.

In such an ultraviolet-curable aqueous colored stain composition, the polymerizable unsaturated bond-containing resin (a) is a unit amount containing the polymerizable unsaturated bond-containing resin (a) and the polymerizable unsaturated bond. In the total 100% by weight of the body (b), 60-100
% By weight ((B) is the balance of 40 to 0% by weight), preferably 80 to 90% by weight ((B) is the balance of 20 to 10)
It is desirable that the content be such that the content is (% by weight).

The photoreaction initiator is 10 in total of the above (a) and (b).
It is preferably 0.1 to 10% by weight, and more preferably 1 to 5% by weight, based on 0% by weight, in the aqueous colored stain composition. Gypsum Examples of the gypsum include anhydrous gypsum, hemihydrate gypsum, and crystalline gypsum, and anhydrous gypsum and hemihydrate gypsum are preferably used. Such plasters have holes in porous material (eg:
The reason is not clear whether it is due to blocking the conduit part of the wood) or water absorption such as hemihydrate gypsum, but for such gypsums, especially anhydrous gypsum and hemihydrate gypsum for porous members The water-based colored stain composition is excellent in terms of adhesion to the surface of an article to be coated such as wood and the ability to prevent surface roughness.

The aqueous colored stain composition according to the present invention can be diluted with water and used, if necessary. Further, the aqueous colored stain composition according to the present invention,
Various components such as those contained in ordinary aqueous colored stains may be blended, and examples of such components include additives such as suspending agents, defoaming agents, leveling agents, extender pigments, organic solvents, etc. Can be given.

In the present invention, such an aqueous colored stain composition is applied to the porous member, but prior to the application (and further curing) of this aqueous colored stain composition, or the application of the aqueous colored stain composition. After (even after curing)
Alternatively, or before and after the application of the aqueous colored stain composition, the transparent coating film-forming coating material may be applied. Examples of the transparent coating film-forming coating material include organic solvent-based coating materials, water-soluble or water-dispersible coating materials, and specifically, room temperature curing type, heat curing type, and ultraviolet ray containing acrylic resin, polyester resin as a main component. Various types of curable coating materials can be mentioned, and the following ultraviolet curable coating composition is preferably used.

[Ultraviolet curable coating composition] The ultraviolet curable coating composition according to the present invention comprises the above ultraviolet curable resin (ultraviolet curable prepolymer) and the following water absorbing agent (dehydrating agent). Contains.

In particular, such an ultraviolet curable coating composition
When (ii) and the above aqueous colored stain composition (i) are applied to the porous member one or more times in any order, a coating film having excellent adhesion to the porous member and excellent smoothness can be formed. .

As the water absorbing agent (dehydrating agent), specifically,
For example, anhydrous gypsum, hemihydrate gypsum in the gypsum,
Zeolite, silica gel, activated alumina, etc.
Among these, anhydrous gypsum, hemihydrate gypsum, and zeolite are preferably used from the viewpoints of improving the adhesion to the coated surface of the coating film obtained, and preventing graininess.

In such an ultraviolet curable coating composition, the water absorbing agent is usually contained in an amount of 0.1 to 20% by weight, preferably 0.5 to 10% by weight, in other words, the ultraviolet rays. The water absorbing agent is preferably contained in an amount of usually 0.2 to 40 parts by weight, preferably 1 to 20 parts by weight, based on 100 parts by weight of the ultraviolet curable resin in the curable coating composition.

Further, it is preferable that the ultraviolet curable resin is contained in such an ultraviolet curable coating composition in an amount of usually 10 to 90% by weight, preferably 30 to 70% by weight.

The UV-curable coating composition according to the present invention contains the above-mentioned monomer having a polymerizable unsaturated double bond in an amount of usually 10 to 90% by weight, preferably 30 to 70% by weight. In other words, the amount of the monomer is usually 2 per 100 parts by weight of the ultraviolet curable resin in the ultraviolet curable coating composition.
0 to 180 parts by weight, preferably 60 to 140 parts by weight, the photopolymerization initiator (photoinitiator) is usually 0.1 to 10% by weight, preferably 1 to 5% by weight, in other words, The photopolymerization initiator is usually contained in an amount of 0.2 to 20 parts by weight, preferably 2 to 10 parts by weight, based on 100 parts by weight of the ultraviolet curable resin in the ultraviolet curable coating composition. .

The ultraviolet-curable coating composition according to the present invention may further contain an extender pigment, an organic solvent and the like. [Coating method] In the present invention, the above-mentioned aqueous colored stain composition (i) for aqueous porous member (aqueous colored stain) and the above-mentioned ultraviolet-curable coating composition (ii) (ultraviolet-curable coating) are provided in any order. Apply each one or more times.

That is, the ultraviolet-curable coating composition (ii) containing a dehydrating agent, which is used by coating with the aqueous colored stain composition (i), is applied before coating the aqueous colored stain composition (i). It may be applied after coating, or may be applied both before and after coating of the aqueous colored stain composition (i).
It may be applied repeatedly more than once.

In a preferred embodiment of the present invention, for example, a water-based colored stain composition (i) for a porous member, preferably an ultraviolet-curable water-based colored stain composition ( It is desirable that the ultraviolet curable coating composition (ii) is applied and cured after the i) is applied and cured. In the present invention, the ultraviolet-curable coating composition (ii) may be applied and cured in this manner, and then the ultraviolet-curable coating composition (ii) may be overcoated and cured.

When the aqueous colored stain composition (aqueous colored stain) is applied in the present invention, a usual coating machine such as a brush, a spray, a roll coater or a sponge roll coater can be used. The coating amount of the aqueous colored stain is preferably 1 to 10 g / square ² [11 to 110 g / m ² ], and more preferably ^{2 to 5} g / square ² [22 to 55 g / m ² ].
Next, the aqueous colored stain applied to the surface is filled inside the material surface with a reverse coater or the like and the rest is scraped off. Further, complementary color coating is performed by a roll coater if necessary. The method of curing the aqueous colored stain composition can be arbitrarily selected depending on the component composition of the aqueous colored stain, and for example, it can be cured by natural drying at room temperature, forced drying under heating, or irradiation with ultraviolet rays.

When coating the ultraviolet curable coating material (ii) containing a dehydrating agent, which is used by coating with the aqueous colored stain (i), an ordinary coating machine such as a sprayer, a roll coater or a curtain flow coater is used. Can be used. The coating amount of the UV-curable coating composition is 1 to 20 g / scale ² , preferably 2
~10g / scale ² is preferred.

A mercury lamp or a metal halide lamp containing iron, gallium or the like can be used as a radiation source for curing the coating film of the ultraviolet curable coating material (ii). The wavelength of these lamps can usually be in the ultraviolet range (eg, 100 to 400 nm), and is preferably in the range of 250 to 400 nm in consideration of rapid curability of the coating film. Although the irradiation time of such ultraviolet rays depends on the wavelength of the lamp, it is usually in the range of 1 to 10 seconds, and preferably 1 to 10 seconds.
In the range of seconds, the curability of the coating film, the amount of light irradiation is suitable,
No discoloration or embrittlement occurs in the coating film.

By applying a combination of the aqueous colored stain composition prepared by mixing the above-mentioned gypsum and the ultraviolet curable coating composition prepared by mixing the dehydrating agent to the porous material by such a method, It is possible to form a coating film that is less likely to cause eye blurring and roughness and has excellent adhesiveness, smoothness, and crack resistance.

[0041]

The aqueous colored stain composition according to the present invention contains a color pigment or dye, a water-dilutable resin, and gypsum. Even if it is applied to inorganic porous materials such as porous materials and cement products (eg slate, concrete blocks), it does not easily cause eye blurring and roughening, has excellent adhesion and smoothness, and also has crack resistance. An excellent and good-finished coating film can be formed. Furthermore, since the water-based colored stain composition according to the present invention uses water as a solvent or a dispersion medium, it is preferable from the viewpoint of environmental protection since there is little danger to animals and plants.

In particular, when the above-described aqueous colored stain composition for a porous member and the ultraviolet-curable coating composition are applied to the porous material at least once or more in any order as described above, the adhesion as described above is obtained. It is possible to form a coating film having excellent smoothness, crack resistance and stain bleeding on the surface of a porous material.

Any of the above-mentioned compositions according to the present invention and a coating method can be used for coating porous materials such as wood and cement products (eg, slate, concrete block), particularly wood-like housing members, floor materials, furniture and the like. It is preferably used for.

[0044]

EXAMPLES Hereinafter, the aqueous stain composition, the ultraviolet-curable coating composition and the coating method thereof according to the present invention will be described more specifically, but the present invention is not limited to these examples. Absent.

The composition values of the water-based stain compositions or UV-curable coating compositions described in the following Examples and Comparative Examples are all shown in parts by weight, unless it is contrary to the spirit of the invention. [Test Method] The test methods used in the following Examples and Comparative Examples are as follows. Finished appearance of coated plate: Evaluated by the presence or absence of eye repellency and graininess. Initial adhesion: "Peeling cellophane tape, 2mm width x
"100" means a test according to JIS K5400 Gobang-tape method, and the number of remaining coating films x / 100 was evaluated. Cold / heat repetition test: The operation of "holding the coated plate at 60 ° C for 2 hours and then at -20 ° C for 2 hours" is repeated twice, and the appearance (cracks, swelling, wrinkles, discoloration, and eyesight) is repeated.
In particular, the presence or absence of cracks was examined.

Evaluation criteria: 4 ... Good / no change in appearance (no crack) 3 ... Slight change in appearance (15 cm × 15 cm, cracks 30 mm or less) 2 ... Change in appearance (15 cm × 15 cm, cracks 31 mm to 99 mm) ) 1) Remarkable appearance change (cracks 100 mm or more per 15 cm x 15 cm) Water resistance test: operation of holding the coated plate in warm water at 60 ° C for 1 hour and then in air at 60 ° C for 2 hours 2
Repeated times, the appearance (cracks, blister, peeling, and significant discoloration and gloss change) was evaluated.

Evaluation criteria: 4 ... Good / no change in appearance 3 ... Slight change in appearance but no problem in practical use 2 ... Change in appearance 1 ... Change in appearance

[0048]

Example 1 [Preparation of Aqueous Colored Stain Composition] A water-based resin obtained by emulsion-dispersing a urethane acrylate resin in water at a ratio of 40 parts of water to 40 parts of urethane acrylate resin (manufactured by Arakawa Chemical Co., Ltd .: Beamset EM- 90) 50 parts, polyethylene glycol diacrylate (Daiichi Kogyo Seiyaku Co., Ltd .: New Frontier PE-300) 10 parts, photoreaction initiator 2 parts (Ciba Geigy: Irgacure 184), anhydrous gypsum 20 parts, yellow pigment 9 parts, 3 parts of red pigment, 4 parts of black pigment,
2 parts of white pigment (All pigments are manufactured by Orient Chemical:
Micropigmo) was mixed with a stirrer to obtain an aqueous colored stain composition. [Preparation of UV-curable coating] 30 parts of urethane acrylate resin (manufactured by Nippon Gosei: Shikotsu UV-7500B), polyester acrylate resin (made by Toa Gosei: Aronix M
-7100) 20 parts, tripropylene glycol diacrylate (Daicel UCB: TRPGDA) 36 parts, anhydrous gypsum 10 parts, and photoreaction initiator 4 parts were mixed with a stirrer to obtain an ultraviolet curable coating material. [Painting] The above water-based colored stain composition is applied to a plywood laminated veneer board with a brush, and wiped off with a waste cloth to give 80 W /
A cm mercury lamp was irradiated for 3 seconds to cure.

The surface of the plywood thus UV-cured was coated with the above-mentioned UV-curable coating material by a roll coater at 2 g / square ² [about 22 g / m ² ] and irradiated with a 80 W / cm mercury lamp for 5 seconds. Cured.

Then, the surface of the UV-curable coating film thus UV-cured was lightly polished with sandpaper (# 320). After polishing in this way,
A UV-curable coating material was applied in the same manner as above at 2 g / square ² [about 22 g / m ² ] and irradiated with an 80 W / cm mercury lamp for 5 seconds to obtain a coated plate.

Various tests were carried out on the coated plate thus obtained, and the finished appearance was good (eye repellency, graininess, etc .: none), and the initial amount of adhesion (detachable cellophane tape peeling, 2 mm width × 100 mesh) ) Is 100/1
In the cold / heat repeated test (“holding at 60 ° C. × 2 hours, then −20 ° C. × 2 hours” is repeated twice), no cracks were observed and the appearance was (4), which was water resistant. Test (“60 ℃ warm water × 1 hour after holding, 60 ℃ air ×
The evaluation of "holding for 2 hours" was repeated twice) was (4).

Table 1 shows the results.

[0053]

Comparative Example 1 [Preparation of Aqueous Colored Stain Composition] Aqueous colored stain composition was prepared in the same manner as in Example 1 except that anhydrous gypsum was not used in [Preparation of aqueous colored stain composition]. Was prepared. [Preparation of UV-curable paint] A UV-curable paint was prepared in the same manner as in Example 1 except that anhydrous gypsum was not used in [Preparation of UV-curable paint]. [Coating] A water-based colored stain composition and an ultraviolet-curable coating material were applied to the oak veneer-laminated board by the same coating method as in Example 1 to obtain a coated board.

Various tests were conducted on the coated plate thus obtained, and the finished appearance was poor (eye repellency, graininess, etc .: present), and the initial amount of adhesion (peeling scotch tape peeling, 2 mm width × 100 mesh) ) Is 40-50
/ 100, and in a cold / heat repeated test (“holding at 60 ° C. × 2 hours, then holding at −20 ° C. × 2 hours” is repeated twice), cracks of 100 to 200 mm were recognized and the appearance evaluation was (1). In the water resistance test (“holding 60 ° C. hot water × 1 hour, then holding 60 ° C. air × 2 hours” is repeated twice), the evaluation was (4).

The results are shown in Table 1.

[0056]

[Table 1]

Front page continuation (72) Inventor Kazuo Morita 2306 Mikami, Yasu-machi, Yasu-gun, Shiga Prefecture 7 China Paint Co., Ltd. No. 7 China Paint Co., Ltd.

Claims (3)

[Claims] 1. A water-based colored stain composition for a porous member, which comprises a color pigment or dye, a water-soluble or water-dispersible resin, and gypsum. 2. An ultraviolet curable coating composition comprising an ultraviolet curable resin and a water absorbing agent. 3. An aqueous colored stain composition for a porous member containing (i) a color pigment or dye, a water-soluble or water-dispersible resin, and gypsum, (ii) an ultraviolet curable resin and a water-absorbing agent. A coating method for a porous member, comprising: applying an ultraviolet-curable coating composition containing a.