JP2003160757A - Inorganic coating, its coated sheet and coating method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inorganic coating, that is useful for an ink-jet coating and the like of a constructional base sheet, is stable without color breakup, and good in dispersibility, and to provide an inorganic-ceramic coated sheet thereof. <P>SOLUTION: The inorganic coating is based on silicon alkoxy silane, wherein this coating is compounded with an inorganic coloring material having a particle diameter of 0.1-2.0 μm and is diluted to 30-70 weight folds with methyl ethyl ketone as a solvent. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The invention of this application relates to an inorganic coating material, a coating plate therefor, and a coating method. More specifically, the invention of the present application relates to an inorganic coating material which is useful for ink-jet coating of a building substrate of an inorganic ceramics industry, which is stable to color separation and has good dispersibility, and a coating plate and a coating method using the same. It is a thing.

[0002]

2. Description of the Related Art Conventionally, various inorganic ceramic building substrates such as cement boards have been used as exterior materials such as outer wall materials and roof materials for buildings. Such a building substrate as an exterior material is required to have excellent designability and long-term weather resistance in addition to advantages such as nonflammability, ease of construction, and low cost.

Therefore, in order to impart excellent designability and long-term weather resistance to an inorganic ceramic-type building substrate, for example, an uneven pattern is generally formed by press molding on the surface of a building substrate formed by papermaking, extrusion molding or the like. It is generally practiced to attach the surface and to coat the uneven surface with various patterns, or to apply a surface coating for improving weather resistance.

Conventionally, means such as roll coating and spray coating have been used for these coatings, but recently, for coating for the purpose of high design, locally and controlled patterns of a predetermined pattern are used. Inkjet coating is becoming more and more popular because it can be used to create a natural texture and achieve a natural texture. The inventors of the present application have also proposed an inkjet coating apparatus for a building substrate that enables the inorganic ceramic building substrate to maintain a high-quality design coating with a natural feel (Japanese Patent Application No. 2001-250290).

[0005]

However, while coating such as patterning is often performed in a relatively short time, in the case of coating a long-term weather-resistant coating film on the surface of an inorganic ceramic building substrate. Is often applied continuously over a long period of time, especially when a long-term weather-resistant coating film is applied on the surface of an inorganic ceramic building substrate by the inkjet method, the paint often stays at the tip of the inkjet nozzle. It was the cause. Therefore, it is said that inkjet coating is not suitable as a method for coating the surface of the inorganic ceramic-based building substrate with the long-term weather-resistant coating, and at present, the spray coating is mainly performed. Therefore, for example, it has been desired to develop an inorganic coating material having good dispersibility such that it can be continuously jetted from an inkjet nozzle and hardly causing color separation, and having long-term weather resistance, and an inorganic ceramic coating plate using the same.

[0006]

Means for Solving the Problems In order to solve the above problems, the invention of the present application is, firstly, a silicon alkoxysilane-based inorganic coating having a particle size of 0.1 to 2.
Provided is an inorganic coating material containing an inorganic colorant in the range of 0 μm and diluted 30 to 70 times by weight with methyl ethyl ketone as a solvent.

In addition, the invention of this application is the same as the above invention. Secondly, the inorganic coloring material is carbon black,
Titanium dioxide, red iron oxide, chrome yellow, chrome green, ultramarine, mars violet, cobalt blue, silica, calcium carbonate, and at least one inorganic coating material. Provided is an inorganic coating composition containing 40 to 60% by weight based on the weight of solid content.

In a fourth aspect of the invention of this application, any one of the above-mentioned silicon alkoxysilane inorganic coating materials is applied to an inorganic ceramic substrate having a color coloring layer, and a pattern layer is formed on the color coloring layer. And a fifth aspect of the present invention provides a coated plate in which the inorganic ceramic substrate has been previously subjected to a waterproof sealer treatment.

The sixth aspect of the present invention further provides, as a coating method for the above-mentioned coated plate, a coating method characterized in that a silicon alkoxysilane inorganic coating material is applied by an ink jet method.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The invention of this application has the characteristics as described above, and the embodiments thereof will be described below.

First, the inorganic coating material provided by the invention of this application is a silicon alkoxysilane type inorganic coating material, in which an inorganic coloring material having a particle diameter in the range of 0.1 to 2.0 μm is blended, and used as a solvent. 30-70 depending on methyl ethyl ketone
It is characterized by being diluted by weight.

As a silicon alkoxysilane-based inorganic coating which is the main constituent of the inorganic coating, (A) is represented by the general formula R ¹ _n SiX _4-n (wherein R ¹ is the same or different substituted or unsubstituted carbon). The average compositional formula of the component (B) represented by the formula 1 to 8 is a monovalent hydrocarbon group, n is an integer of 0 to 3, and X is a hydrolyzable group is R ² _a Si (OH). _b O
_{(4-ab) / 2} (In the formula, R ² represents the same or different substituted or unsubstituted monovalent hydrocarbon group having 1 to 8 carbon atoms, and a and b each represent 0.2 ≦ a ≦ 2, A component represented by 0.0001 ≤ b ≤ 3 and a + b <4), and (C) various silicon alkoxysilane-based inorganic coatings containing a curing catalyst are considered as suitable. can do. This silicon alkoxysilane-based inorganic coating has been already proposed by the applicants, and it is possible to form a pattern layer, a surface coating layer, etc. by painting, and suppress the occurrence of pattern unevenness, For example, even if unevenness occurs in the lower pattern layer, it has the effect of making it less noticeable. Above all, since the coating film is made of a silicon alkoxysilane-based inorganic material, long-term durability and weather resistance can be secured.

What is important in the invention of this application is that the particle size of the inorganic colorant compounded in the silicon alkoxysilane inorganic paint is in the range of 0.1 to 2.0 μm. Is. Particles having a particle size of less than 0.1 μm are not preferable because they are expensive and are too fine to handle. In addition, particles having a particle size of more than 2.0 μm are not preferable because they are not uniform in the paint and color separation is likely to occur. And the particle size is 0.1-2.
By making the particles relatively uniform in the range of 0 μm, it is possible to obtain the effect of suppressing color floating.

Specific examples of such an inorganic colorant include carbon black, titanium dioxide, red iron oxide, chrome yellow, chrome green, ultramarine, mars violet, cobalt blue, silica stone, and calcium carbonate. be able to. These inorganic colorants can be used alone or in combination of two or more, and an organic colorant may be used in combination within a range allowable in terms of weather resistance and the like. .

It is generally preferable that the inorganic colorant is blended in the range of 20 to 70% by weight based on the weight of the total solid content (coating component), and further 40 to 40% by weight.
It is preferably blended at 60% by weight. Within this range, the hiding property and the colorability can be favorably maintained without impairing the properties of the silicon alkoxysilane-based inorganic coating material itself. When the proportion is as low as less than 40% by weight, and further less than 20% by weight, the hiding and coloring properties for forming the pattern layer are not sufficient, and a large amount of the compounding agent exceeds 60% by weight and more than 70% by weight. In such a case, the dispersibility (mixability) in the silicon alkoxysilane-based inorganic coating composition is impaired, and the performance as a coating composition is impaired.

In the inorganic paint of the invention of this application, the paint component is 30% by using methyl ethyl ketone as a solvent.
It is adjusted by being diluted to 70 times by weight. If the dilution ratio is less than 30 times, the coloring material tends to settle after the coating material is adjusted, and it is difficult to apply the coating because the concentration of the coating material is too high, or the fine coloring material once settled may be dispersed again. It is not preferable because it becomes difficult. On the other hand, when the dilution ratio exceeds 70 times, it is not preferable because the concentration of the coating is too thin to make the coating difficult and it takes a long time to dry the coating. Further, in the inkjet coating device proposed by the inventors of the present application, the paint is constantly circulated and flowed. However, by setting the dilution ratio to 30 to 70 times by weight, even in such circulated flow. The colorant can remain highly dispersed. As the methyl ethyl ketone (MEK) solvent, a commercially available product can be used, but this may contain inevitable impurities, and further, other ketone-based solvent containing up to about 10% by weight of the total amount of the solvent. , An alcohol solvent, or an ether solvent may be contained.

As described above, the inorganic coating material of the present invention has excellent weather resistance and is useful for, for example, ink-jet coating of building substrates. It is stable and stable in color, and has good dispersibility. The paint will be realized. The inorganic coating material of the invention of this application having such excellent characteristics can be prepared by mixing the above-mentioned silicon alkoxysilane coating material component with an inorganic coloring material and diluting it with a methyl ethyl ketone solvent.

The invention of this application also provides a coated plate using the above-mentioned inorganic coating material. In this case, as the coating plate, an inorganic ceramic substrate on which a waterproof sealer is applied in advance and a color coloring layer is provided is used as the coating plate.

As for the inorganic ceramic substrate, an aqueous kneaded material or an aqueous slurry of various compositions containing cement as a main component, inorganic components such as silica and fly ash, and optionally reinforcing short fibers such as pulp. More extrusion,
It may be a molded body having various shapes such as a plate shape, a slab shape, and a rod shape, which has been molded and cured by various methods such as cast molding or papermaking. These various molded bodies can be conveniently referred to as “substrate”.

Various forms of the composition ratio, the amount of water, the molding method, etc. can be adopted including well-known ones.

For example, the composition of the solid component is as follows:
Cement component 40 to 90% by weight, other inorganic components such as silica and fly ash 10 to 40% by weight, reinforcing short fiber 20
For example, a weight% or less will be exemplified.

As the waterproof sealer, commercially available products such as silicone type and acrylic type can be used.

For example, as shown in FIG. 1, an inorganic ceramic substrate (1) optionally subjected to a waterproof sealer treatment is first coated with a color coloring layer (2), and then the present invention is applied thereon. The inorganic coating material as described above is applied to form the pattern layer (3). Further, if necessary, a clear coating layer (4) is provided on the pattern layer (3). In the constitution of such a multilayer coating film, it is preferable that the contact angle of water of the colored layer (2) is 60 to 110 degrees, and the inorganic coating material for forming the pattern layer (3) is The surface tension is preferably in the range of 10 to 30 mN / m.

These characteristics are to improve the conformability at the interface between the two, and to suppress the occurrence of unevenness of the pattern layer (3) and improve the appearance.

For the color colored layer (2), various paints may be used as a resin containing a pigment or the like, and various kinds such as acrylic resin type, urethane type, or inorganic type may be used. It may be a commercially available product.

In order to control how the paint spreads when the pattern layer (3) is formed, it is effective to make the paint for coating the color coloring layer (2) contain an aggregate.

As the aggregate, for example, silica sand, silica color sand, beads or the like is used, and it is preferable that the average particle diameter thereof is in the range of 100 to 600 μm.

If it is out of this range, the occurrence of pattern unevenness may be promoted, which is not preferable.

Regarding the content of the aggregate, it is considered that the solid weight of the coating film is generally about 0.5 to 10% by weight.

In the production of the coated plate of the present invention as described above, the above-mentioned inorganic coating material can be applied by the ink jet method, and this method is preferable.

The thickness and coating amount of each layer described above are not particularly limited, and can be determined according to the purpose of coating, application, type of coating material, and the like. Generally, the coating amount is 50 to 20 in the case of the color coloring layer (2).
0 g / m ² , 1-20 g / in the pattern layer (3)
In the case of m ² and the clear coating layer (4), about 1 to 10 g / m ² can be considered.

Therefore, the embodiments of the present invention will be described in more detail with reference to the following examples.

[0033]

Examples <Examples 1 to 5> As a silicon alkoxysilane-based inorganic coating material, the components (A), (B) and (C) as described above were used, and the weight ratio of (A), (B) :( C) was set. Manufactured by Matsushita Electric Works, Ltd .: product name MB-R440 with titanium dioxide (white) and chrome yellow (yellow) inorganic coloring agents in an amount of 50% by weight. The color-developing property and the sedimentation property were evaluated for each of the prepared inorganic paints diluted with methyl ethyl ketone.

Table 1 shows the results of evaluation when the particle size of the coloring material and the dilution ratio of methyl ethyl ketone were changed.

The evaluation of the color separation property and the sedimentation property was carried out according to the following method. <Color Separation> The adjusted inorganic paint was applied to an aluminum plate having a smooth surface, and the wet coating film was rubbed with a finger to extend it, and the colored state was visually observed. The results are shown in Table 1 as evaluation categories of A: no color separation, B: some color separation is observed, and C: color separation is significantly generated. <Settling property> The adjusted inorganic coating material was allowed to stand in a transparent container, and then stirred at a low speed of about 50 to 200 rpm with a stirrer, and the state after stirring was visually observed. Result is,
A: Colorant does not settle at low speed, B: Some colorant remains at the bottom of the container, C: Colorant remains at the bottom of the container,
The evaluation categories are also shown in Table 1.

[0036]

[Table 1]

The inorganic paints of Examples 1 to 5 are within the scope of the invention of this application in terms of the particle size of the coloring material and the dilution ratio, and the coloring material does not separate into colors, and the coloring material settles down even at low speed stirring. It was confirmed that dispersibility did not occur and the dispersibility was good.

On the other hand, in the inorganic coating material of Comparative Example 1, although the particle diameter of the coloring material is appropriate, the concentration is too high and the coloring material is difficult to disperse because the dilution ratio is low.

In the inorganic coatings of Comparative Examples 3 and 4, although the dilution ratio is appropriate, the colorant particles are too large or too small, so that coloration and sedimentation of the colorant are observed.

In Comparative Example 5, since the particle size of the coloring material is too large and the dilution ratio is low, color separation and sedimentation of the coloring material are remarkable, and the dispersibility is extremely poor. <Examples 6 to 9> In the inorganic coating material of Example 1 above, the mixing ratio of the colorant was changed, and the color-separation property and the sedimentation property, and the hiding property and the coloring property were evaluated in the same manner. The results are shown in Table 2.

[0041]

[Table 2]

From these results, it was confirmed that good results were obtained in the range of 40 to 60% by weight. <Examples 10 to 11> As the cement-based inorganic base material,
The solid content composition is 60% by weight of ordinary Portland cement,
A material formed by using 30% by weight of silica and 10% by weight of pulp short fiber as a raw material was used. After the acrylic waterproof sealer treatment, a color coloring layer and a pattern layer were formed by painting.

To form the colored layer, Kansai Paint Co., Ltd. product name IM-5313 color paint was used, and the coating amount was 100 g / m ² and the drying condition was 100 ° C. for 5 minutes.

Next, the coating materials of Examples 1 and 4 and Comparative Examples 1 and 6 were applied by an ink jet method, and the coating amount was 8 g / m ² and the drying condition was 130 ° C. for 5 minutes. As a pattern layer was formed.

The weather resistance and the appearance of the obtained coated plate were evaluated by the following methods. The results are shown in Table 3. <Weather resistance> Evaluation after 1500 hours of UV irradiation with an eye super UV tester A: No abnormality B: Some abnormality C: Abnormal <Appearance> Visual observation evaluation A: Good B: Somewhat unfavorable C: Remarkably unfavorable <Paintability> Evaluate the presence of trouble such as nozzle clogging

[0046]

[Table 3]

It has been confirmed that the invention of this application can provide a coated plate having excellent coating performance and appearance.

Of course, the present invention is not limited to the above examples, and it goes without saying that various aspects are possible in details.

[0049]

Industrial Applicability As described in detail above, the present invention provides an inorganic coating which is useful for ink-jet coating of building substrates, which is stable in color separation and has good dispersibility. Further, a coated plate having excellent weather resistance and appearance is provided.

[Brief description of drawings]

FIG. 1 is a cross-sectional view illustrating the configuration of a coated plate according to the invention of this application.

[Explanation of symbols]

1 Inorganic ceramics substrate 2 colored layers 3 pattern layers 4 clear paint layer

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yukio Shimada             1048, Kadoma, Kadoma-shi, Osaka Matsushita Electric Works             Within the corporation (72) Inventor Yasuhiro Mori             1048, Kadoma, Kadoma-shi, Osaka Matsushita Electric Works             Within the corporation (72) Inventor Hidetaka Honda             1048, Kadoma, Kadoma-shi, Osaka Matsushita Electric Works             Within the corporation (72) Inventor Hitoshi Katsuta             1048, Kadoma, Kadoma-shi, Osaka Matsushita Electric Works             Within the corporation F-term (reference) 4D075 AC06 AE03 BB62X CA32                       CA47 CB07 CB11 DA06 DA10                       DC02 EA10 EA39 EB22 EB38                       EB43 EB47 EB56 EC01 EC11                       EC30 EC53 EC54                 4J038 DL021 DL031 HA026 HA166                       HA216 HA246 HA286 HA446                       JA33 KA04 KA06 NA01 NA03                       NA24 PA07 PC03 PC04                 4J039 AE11 BA04 BA13 BA15 BA16                       BA21 BC18 BE01 BE12 CA07                       EA34 EA41 EA46 FA07 GA24

Claims (6)

[Claims] 1. A silicon alkoxysilane-based inorganic coating material, which comprises an inorganic colorant having a particle size in the range of 0.1 to 2.0 μm, and is diluted 30 to 70 times by weight with methyl ethyl ketone as a solvent. Inorganic paint that is characterized by 2. The inorganic colorant is one or more selected from carbon black, titanium dioxide, red iron oxide, chrome yellow, chrome green, ultramarine blue, mars violet, cobalt blue, silica stone, and calcium carbonate. The inorganic coating material according to claim 1, which is characterized in that. 3. The inorganic coloring material accounts for 4% of the total solid content weight.
The inorganic coating composition according to claim 1 or 2, wherein the inorganic coating composition is contained in an amount of 0 to 60% by weight. 4. A silicon alkoxysilane-based inorganic coating material according to claim 1 is applied to an inorganic ceramic substrate having a color coloring layer, and a pattern layer is formed on the color coloring layer. A painted board characterized by being. 5. A coated plate, characterized in that the inorganic ceramic substrate coated with the silicon alkoxysilane inorganic coating is provided with a colored layer after being subjected to a waterproof sealer treatment. 6. A coating method for a coated plate according to claim 4 or 5, wherein the silicon alkoxysilane inorganic coating material is applied by an ink jet method.