JP3315177B2 - How to color porous materials - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for coloring mainly pores of a porous material having a porous portion at least on its surface, such as a wooden material.

[0002]

2. Description of the Related Art Conventionally, in order to make use of the characteristics of a wood-grained ground surface of wood and the taste of natural beauty, a coloring agent is applied only to the conduit portion (grain, perforated portion) of the wood surface. Then, there are many methods of applying a transparent paint over the entire surface. Heretofore, an organic solvent-based colorant using an organic solvent as a solvent or a dispersion medium has been used as the colorant. However, it is not preferable in view of pollution control, resource saving and danger prevention, and drying of the filled colorant. It takes a long time to cure (generally, several hours or more at room temperature)
In addition, the coloring agent has defects such as migration to the transparent coating film and bleeding easily, and it is strongly desired to eliminate these defects.

[0003]

SUMMARY OF THE INVENTION The present invention is to solve the above-mentioned defect in coloring the pores of a porous material.
Its feature is that it has a polymerizable unsaturated double bond as a colorant
Resin, monomer having polymerizable unsaturated double bond, photosensitizer
And disperse or dissolve the color pigment or dye in water
An ultraviolet irradiation-curable water-based colored stain mainly composed of As a result, all of the above-mentioned defects caused by the use of the organic solvent were eliminated, the curing time was shortened, and the transfer of the colorant to the transparent coating film was prevented.

That is, the present invention relates to a method for coloring a pore portion of a material having a porous portion on its surface, wherein the coloring agent is used as a coloring agent.
Resin having polymerizable unsaturated double bond, polymerizable unsaturated double
The main component is a monomer obtained by dispersing or dissolving a monomer having a bond, a photosensitizer and a coloring pigment or dye in water.
Using ultraviolet radiation curable aqueous colored stains that, colored
The present invention relates to a method of coloring a porous material, which comprises coating an agent, filling the inside of a hole, and curing the material by irradiation with ultraviolet light .

[0005] The porous material (substrate to be coated) applicable in the present invention only has to be porous at least on its surface, and it does not matter whether the inside is porous. The diameter of the pores in the porous portion is not particularly limited, but is preferably about 5 mm or less, particularly preferably about 1 mm or less. Examples of such porous materials include, in addition to the above-mentioned woody materials, inorganic materials such as slate, concrete blocks and cement products, and foamed plastic materials. These shapes are not particularly limited, for example, a rod shape, a plate shape, a sheet shape, a polygonal shape,
A curved surface shape and a combination thereof are exemplified. Also, there may be no irregularities such as grooves on the surface. In the present invention, the surface of these materials is preferably polished or surface-treated before applying the colorant. In particular, the method of the present invention is preferably applied to wood used for building materials, furniture furniture and decorative articles.

The aqueous colored stain used in the present invention is obtained by dispersing a colored pigment or dye in water, and specifically, a resin having a polymerizable unsaturated double bond.
Fats, monomers having polymerizable unsaturated double bonds, photosensitizers
And disperse or dissolve the color pigment or dye in water
An ultraviolet irradiation-curable water-based colored stain mainly composed of An organic solvent can be added to the aqueous colored stain within a range that does not impair the purpose of the present invention. These components are described below.

As the aqueous resin, known coating resins having or not having a hydrophilic group (for example, carboxyl group, amino group, etc.) in the resin skeleton can be used. Specifically, acrylic resin, urethane resin,
Examples include those having a basic skeleton of a polyester resin, an epoxy resin, a vinyl acetate resin, a polyvinyl alcohol resin, and the like, and further include an unsaturated resin obtained by introducing a polymerizable unsaturated double bond into these resins. Introduction of a polymerizable unsaturated double bond can also be performed by a known method. Among them, the resin having a hydrophilic group can be dissolved or dispersed in water as it is, but the resin having no hydrophilic group can be dispersed in water by adding an emulsifier or the like. These resins can be cured at room temperature or by heating, or include resins that are cured by ultraviolet irradiation. A crosslinking agent can be used in combination to crosslink and cure the above resin. Specifically, a melamine resin (including an alkyl etherified compound) or a block polyisocyanate compound is used for a room temperature or heat curing type resin, and for a UV irradiation curing type, Monomers having a polymerizable unsaturated double bond are preferred. As the coloring pigment or dye, those known as paint colorants can be applied.

In the method of the present invention, it is preferable to use an ultraviolet irradiation-curable type among the above-mentioned aqueous colored stains, since the shortening of the curing time and the prevention of the transfer of the coloring agent are particularly remarkably excellent.

The ultraviolet irradiation-curable aqueous colored stain is obtained by dispersing the above-mentioned resin having a polymerizable unsaturated double bond, a monomer having a polymerizable unsaturated double bond, a photosensitizer, and a coloring pigment or dye in water. Alternatively, a material obtained by dissolution is used as a main component.

As the resin having a polymerizable unsaturated double bond, for example, unsaturated polyester resin; (meth) acrylic acid or hydroxyalkyl (meth) acrylate or the like is directly or via a polyisocyanate or the like on a polyester resin or an acrylic resin. Resin which has polymerizable unsaturated double bond introduced into the terminal or side chain by addition of (meth) acrylic acid or hydroxyalkyl (meth) acrylate to urethane-modified acrylic resin or polyester resin Unsaturated resin obtained by introducing a polymerizable unsaturated double bond into a terminal or a side chain thereof; unsaturated resin obtained by introducing a polymerizable unsaturated double bond into a terminal or a side chain of an epoxy resin; Can be The number average molecular weight of these resins is preferably in the range of about 1,000 to 100,000, and the number of polymerizable unsaturated double bonds is 2 per molecule.
More than one is suitable.

The monomer having a polymerizable unsaturated double bond is a compound having one or more polymerizable unsaturated double bonds in one molecule and having a molecular weight of less than 1,000. (Meth) acrylic acid esters, styrene, vinyl acetate, (meth) acrylonitrile, glycidyl (meth) acrylate and the like are preferred. Furthermore, polyhydric alcohols such as ethylene glycol, polyethylene glycol, propylene glycol, and polypropylene glycol are reacted with (meth) acrylic acid and the like to form two or more molecules per molecule.
A monomer having two or more polymerizable unsaturated double bonds can also be suitably used.

Examples of the photosensitizer include benzoin, benzoin alkyl ethers, 2-methylbenzoin,
Examples include benzophenone, Michler's ketone, benzyl, benzyldimethyl ketal, anthraquinone, methylanthraquinone, diacetylacetophenone, diphenylsulfide, anthracene, and the like.

The composition ratio of each of the above components in the ultraviolet irradiation-curable aqueous coloring stain can be arbitrarily selected according to the purpose. For example, a resin having a polymerizable unsaturated double bond and a resin having a polymerizable unsaturated double bond may be used. The ratio to the monomer is 10 to 90% by weight based on the total weight of both components, and 9% for the latter.
0 to 10% by weight is preferable, and the photosensitizer is 100% of both components.
0.1 to 10 parts by weight per part by weight is preferred.

An ultraviolet irradiation method for curing a porous portion filled with an ultraviolet irradiation-curable aqueous coloring stain includes, for example, a mercury lamp, a high-pressure mercury lamp, an ultra-high-pressure mercury lamp, a xenon lamp, a carbon arc, a metal halide lamp, and a solar lamp. When irradiation is performed using light or the like as the irradiation source in air or an inert gas at an irradiation amount of usually 10 to 2,000 mJ / cm ² , the colored stain filled in the porous portion is rapidly crosslinked and cured, and The object of the invention can be achieved.

The water-based colored stain used in the present invention has a viscosity at the time of coating of 7% at Iwata cup / 20 ° C.
-30 seconds, especially 7-10 seconds, and the solid content is 10
-40% by weight, especially 20-30% by weight, is suitable.

In the method of the present invention, the aqueous colored stain is applied to the surface of the porous material. The aqueous colored stain is mainly filled in the pores of the material surface. It takes advantage of the taste of natural beauty. Specifically, first, an aqueous colored stain is applied to the surface of the porous material using, for example, a natural roll coater, a spray or a shower coater. The application amount of the aqueous coloring stain is, for example, 1 to
10 g / (30 cm × 30 cm), especially 2 to 5 g / (30 cm
× 30 cm) is preferred. Next, the inside of the hole is filled with the aqueous colored stain while wiping off the excess aqueous colored stain applied to the surface.

The wiping is to remove the aqueous colored stain applied to the portions other than the porous portion while filling the aqueous colored stain applied to the surface of the porous material into the porous portion. Specifically, a reverse roll coater, a brush wiping, and the like. (Wiping machine), manual wiping (wiping with a rag), and cloth belt wiping. Thereafter, the filled aqueous colored stain is cured. The curing method can be arbitrarily selected depending on the composition of the aqueous colored stain, and the composition is cured by leaving it at room temperature, heating, or irradiating ultraviolet rays.

In the present invention, after the aqueous colored stain is filled in the porous portion on the surface of the porous material, a transparent film forming paint (clear coat) can be applied to the surface of the porous material as required. The clear coat uses an organic solvent and / or water as a solvent or a dispersion medium,
For example, cold-setting, heat-curing, and ultraviolet irradiation-curing coatings, which are mainly composed of acrylic resin, polyester resin, and the like, can be used. The application amount is, for example,
3 to 50 g / (30 cm × 30 cm), especially 4 to 30 g /
(30 cm × 30 cm) is preferred.

[0019]

【The invention's effect】

1. Since it has excellent drying properties, intermediate coating or top coating can be performed promptly. 2. The aqueous stain filled in the pores hardly oozes into the intermediate coat or the top coat. 3. Since the aqueous stain used in the present invention uses water as a solvent or a dispersion medium, it has a low risk and is preferable from the viewpoint of preventing pollution and saving resources.

Hereinafter, embodiments of the present invention will be described. I. Sample Porous material: Oak (wood) Aqueous colored stain: 80 parts by weight of polyethylene diacrylate (number average molecular weight about 400 to 800), 20 parts by weight of an unsaturated resin emulsion obtained by adding hydroxyethyl acrylate to a urethane-modified polyester resin ( Solids), 6 parts by weight of a yellow pigment, 4 parts by weight of a black pigment, 4 parts by weight of a red pigment, 5 parts by weight of a photosensitizer, 6 parts by weight of a pigment dispersant, and 353 parts by weight of tap water. The fraction content was adjusted to 25% by weight. The paint viscosity is about 7 seconds / Iwata cup / 20 ° C.

II. Example 2-5 g of an aqueous colored stain is sprayed on a porous material.
/ (30 cm × 30 cm), left at room temperature for several minutes, and then wiped with a reverse roll coater or brush wiping. By irradiating ultraviolet rays at room temperature, the aqueous colored stain filled in the porous portion was cured.

III. Performance Test Results Even when the crosslinked curable acrylic resin-based clear coat was applied to the coated plate obtained in the example, no exudation of the pigment in the colored stain was observed on the clear coat coating film. Furthermore, water resistance (80 ° C warm water / 1 hour and 60 ° C drying /
10 cycles no abnormality: 2 hours 1 cycle) No abnormality: Sunshine weatherometer 250 hours No abnormality: alkali resistance (1 cc of 1% by weight sodium carbonate was dropped, and the coated surface was observed after 6 hours) No abnormality.

Continuation of the front page (56) References JP-A-47-19015 (JP, A) JP-A-58-156374 (JP, A) JP-A-2-225576 (JP, A) JP-A-3-193404 (JP) , A) JP-A-5-76829 (JP, A) JP-A-8-500148 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) C09D 15/00 B05D 7/06 B27K 5/02 C09D 201/00

Claims (1)

(57) [Claims] 1. The coloring of a hole portion of a material having a porous portion on a surface.
A polymerizable unsaturated double bond as a colorant
A resin having a monomer having a polymerizable unsaturated double bond,
Disperse the photosensitizer and coloring pigment or dye in water or
Using an ultraviolet irradiation-curable water-based colored stain mainly composed of a dissolved one, the colorant is applied and filled inside the hole.
A method for coloring a porous material, comprising filling and curing by irradiation with ultraviolet light .