JP2002220293A - Coated, inorganic building material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coated, inorganic building material having a fragile layer of a cutting part of ceramic base material reinforced effectively and showing high coating-film adhesion, water resistance, and cold tolerance even after the prolonged use of it. SOLUTION: The surface-coated, inorganic building material is such that a cutting part of ceramic base material is coated with mixed coating obtained by mixing an alkoxy-silane water repellent and a urethane sealer containing a polymer with a weight-average molecular weight of 15,000-60,000.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The invention of this application relates to a painted inorganic building material. More specifically, the invention of this application relates to a coated inorganic building material in which a cut portion is reinforced and has high coating film adhesion, waterproofness, and frost damage resistance.

[0002]

2. Description of the Related Art Painted inorganic building materials are widely used as exterior materials such as exterior walls of houses and roofing materials, and various kinds of designs are provided. These painted inorganic building materials are usually made from raw material slurries mainly composed of cement, inorganic fillers, etc.
To cut the ceramic base material obtained by the compression method, extrusion method, etc. to the size and shape according to the application, to further enhance the design, and to add weather resistance such as waterproofness and frost damage resistance Obtained by applying a top coat.

[0003] A method of cutting a ceramic base material includes a cutting process in which an end portion is cut vertically, and a cutting process in which the thickness direction is uneven or stepped in order to increase the strength of a joint between ceramic building materials. There is actual processing to make these irregularities and stairs fit at the joints between ceramic building materials. However, in any of the methods, there is a problem in that the strength of the cut portion of the ceramic base material is low because an inner layer having a lower density than the surface layer appears on the surface. In particular, on the surface of the cut portion obtained by actual machining, the density is remarkably low, and there is a problem that not only the strength but also the waterproofness is extremely low.

Further, there is a problem that cutting powder easily remains in the cut portion of the ceramic base material, and a fragile layer often forms around the cut portion. In such a fragile layer, the ceramic base material is liable to peel or crack, and the strength of the entire ceramic base material is reduced, the beauty is impaired, or the cut portion is apt to be damaged. In the case of a coated inorganic building material obtained by applying a top coat to such a ceramic base material, there is a problem that breakage and peeling of the top coat easily occur in a short period of time.

[0005] In view of the above, there has been proposed a method in which a sealer containing a polymer having a relatively high molecular weight is applied as a base to a cut portion of a ceramic base material to reinforce the cut portion.

[0006]

However, although the above-mentioned proposed technique has shown a high effect in reinforcing a ceramic base material cut portion, the waterproofness of a painted inorganic building material has not been sufficiently obtained. is there. In other words, there is a problem that water easily penetrates into the ceramic base material from the cutting part due to rainfall, moisture, freezing, etc., and swelling of the ceramic base material and accompanying peeling off of the top coat due to long-term use. is there.

In order to solve such a problem, use of a water repellent has been studied. However, the water-repellent agent alone does not provide the reinforcing effect of the ceramic base material or the adhesion to the top coat, and the method of applying the sealer after applying the water-repellent agent increases the number of steps. There are new problems such as an increase in manufacturing cost, and the formation of a portion where the top coat easily peels unless the sealer completely covers the surface of the water repellent.

[0008] Accordingly, there has been a demand for a coated inorganic building material which effectively reinforces the fragile layer of a ceramic-based substrate cutting portion and exhibits high coating film adhesion, waterproofness, and frost damage resistance even after long-term use.

[0009]

Means for Solving the Problems According to the invention of the present application, first, as a solution to the above-mentioned problems, firstly, an inorganic building material whose surface is painted is used for cutting a ceramic base material.
Alkoxysilane water repellent and weight average molecular weight of 1500
Provided is a coated inorganic building material, wherein a mixed paint obtained by mixing a urethane sealer containing a polymer having a molecular weight of 0 to 60000 is applied.

Secondly, the invention of this application is based on the above-mentioned coated inorganic building material, wherein the mixed paint is mixed with a urethane-based sealer after the solid content of the alkoxysilane-based water-repellent is reduced to 30% by weight or less. The resulting inorganic building materials are provided.

Further, the invention of this application is, in the third aspect, in any one of the above-mentioned painted inorganic building materials, wherein the solid content of the alkoxysilane-based water repellent in the mixed paint is 50% by weight of the total solid content of the mixed paint. We also provide the following painted inorganic building materials:

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The coated inorganic building material of the invention of this application is a coated inorganic building material whose surface is coated, and has an alkoxysilane-based water repellent and a weight average molecular weight of 15,000 to 6
A mixed paint obtained by mixing a urethane-based sealer containing a polymer having a molecular weight of 0000 was applied to a cut portion of a ceramic base material.

First, the urethane sealer used is:
The polymer has a weight average molecular weight of 15,000 to 60,000
Any polymer may be used as long as it contains the above polymer. For example, a weight average molecular weight of 15,000 to 600
It may contain a solvent, a curing agent, a pigment, a filler, and the like in addition to the polymer of No. 00, and may be any of a two-component curing type and a one-component moisture curing type.

The polymer contained has a weight average molecular weight of 60
When it is larger than 000, the impregnating property of the mixed paint into the ceramic base material is reduced, and the brittle layer generated in the cut portion of the ceramic base material cannot be reinforced. For this reason, in the obtained inorganic building material, peeling of the top coat easily occurs, which is not preferable. On the other hand, when the weight average molecular weight of the polymer contained in the urethane-based sealer is smaller than 15,000,
Although the impregnating property of the mixed paint into the ceramic base material is high, the adhesion of the top coat is reduced because the sealer layer of the mixed paint does not remain on the surface of the ceramic base material. Therefore, in the coated inorganic building material of the invention of this application, the urethane-based sealer in the mixed paint applied to the cut portion of the ceramic base material has a weight average molecular weight of 150 as a polymer.
It is important that the polymer contains a polymer having a molecular weight of 00 to 60000.

Next, the water repellent to be mixed with the urethane sealer as described above may be an alkoxysilane water repellent, and R ¹ R ² R ³ Si—OR (where R Is a chain or alicyclic hydrocarbon group, and R ¹ to
R ³ is a hydrogen atom bonded to Si or a hydrocarbon group which may have a substituent, and at least one of R ^{1 to} R ³ is a hydrocarbon group which may have a substituent. Any one may be used as long as it has the alkoxysilane represented by the formula (1) as a repeating unit. It may contain components other than the above-described repeating units, components having different molecular weights, solvents, pigments, and the like, and various known alkoxysilane-based water repellents are preferably applied.

When the mixed paint obtained by mixing such an alkoxysilane-based water repellent and the urethane-based sealer is applied to a cut portion of a ceramic substrate, the alkoxysilane-based water-repellent component in the mixed paint is obtained. Is easily impregnated into the ceramic substrate cut portion and remains on the cut surface. Thereby, the fragile layer generated in the cut portion of the ceramic base material is reinforced, the adhesion of the paint film to the top coat is enhanced, and the cut portion is also provided with high waterproofness. Therefore, the resulting coated inorganic building material does not penetrate water even after long-term use, and the top coat is less likely to peel off due to swelling, and has high frost damage resistance.

In the coated inorganic building material of the invention of the present application, the mixed paint applied to the ceramic substrate cut portion has the above-mentioned characteristics, and the mixed alkoxysilane water repellent component and urethane The composition of the system sealer component is not particularly limited. However, in order to further enhance the waterproofing effect of the mixed paint, and to improve the coating adhesion, the frost damage resistance, and the design of the top coat of the obtained inorganic building material, the alkoxysilane repellent mixed with the urethane sealer is required. It is preferable that the solid content concentration of the liquid medicine is 30% by weight or less.

This is because, when the solid concentration of the alkoxysilane-based water repellent is greater than 30% by weight, the concentration of the alkoxysilane-based water-repellent component in preparing a mixed coating composition may be limited. is there. That is, when the solid concentration of the alkoxysilane-based water repellent to be mixed is greater than 30% by weight, cloudiness due to solvent shock is likely to occur when mixed with a urethane-based sealer, and accounts for the total solid content of the mixed paint. The solid content of the alkoxysilane-based water repellent cannot be increased so much. When the mixed paint with cloudiness is applied to the cutting part of the ceramic base material, it is not only difficult to impregnate the ceramic base material, but also the coating film of the part where the waterproof property is insufficient and the top coat Because there are places where adhesion is low, and it becomes difficult for the coating film to become uniform,
Not preferred.

On the other hand, if the solid content of the alkoxysilane-based water repellent is 30% by weight or less, the white turbidity of the mixed paint is increased even if the solid content of the alkoxysilane-based water-repellent in the total solid content of the mixed paint is increased. Does not happen. For example, when the solid concentration of the alkoxysilane-based water repellent is 30% by weight,
A uniform mixed paint containing 50% by weight of alkoxysilane solids can be obtained, and if this is applied to the cut portion of a ceramic substrate, a high coating with high waterproofness and a top coat over the entire coated surface can be obtained. Thus, a coated inorganic building material having film adhesion can be obtained.

At this time, the solid concentration of the alkoxysilane-based water repellent mixed with the urethane-based sealer may be adjusted by diluting the alkoxysilane-based water-repellent with an appropriate solvent, or may be adjusted to 30% by weight. A commercially available product having the following solid content concentration may be used.

[0021] In the coated inorganic building material of the invention of the present application, in the mixed paint applied to the cutting portion of the ceramic base material, the solid content of the alkoxysilane-based water repellent in the total solid content of the mixed paint is as follows. , 50% by weight or less.

The higher the content of the alkoxysilane-based water repellent solid content in the mixed paint, the higher the waterproofness of the resulting inorganic coating material for building. However, if the content is too large, the mixed paint tends to become cloudy, There is a possibility that the fragile layer of the cut portion of the base material is not sufficiently reinforced, or that the adhesion of the coating film of the top coat is reduced. By setting the content of the solid content of the alkoxysilane-based water repellent to 50% by weight or less of the total solid content of the mixed paint, the brittle layer is effectively reinforced,
It is preferable because high waterproofness and coating film adhesion are obtained, and frost damage resistance is also increased.

The coated inorganic building material of the invention of this application only needs to apply the mixed paint as described above to the cut portion of the ceramic base material, and the method of applying the mixed paint is not particularly limited. For example, it may be applied by a generally used means such as a brush (brush), a roller coater, and a spray. At this time, the amount of application is not particularly limited. However, in order to avoid the foaming and swelling of the top coat while sufficiently exhibiting the effect of the mixed paint, the amount is 5 to 200 g / m ^2.
It is preferable that

Further, in the coated inorganic building material of the invention of this application, any ceramic base material may be used. For example, a ceramic base material obtained by a papermaking method, a casting method, a compression method, an extrusion method or the like using cement or an inorganic filler as a main raw material is exemplified. In such a ceramic substrate, the composition of the raw material and the shape and size of the ceramic substrate are not limited.

[0025] The coated inorganic building material of the invention of the present application may be any material obtained by applying the above-mentioned mixed paint to the cut portion of the ceramic base material and then applying a top coat. The type, composition, application method, application amount, and the like of the paint used for painting are not limited. Of course, a coating layer or the like may be further provided on this top coat.

Hereinafter, examples will be shown, and embodiments of the present invention will be described in more detail. Of course, the present invention is not limited to the following examples, and it goes without saying that various aspects are possible in detail.

[0027]

Examples <Examples 1 to 3> Preparation of mixed paint As a urethane-based sealer, the weight average molecular weight was 450.
A multi-sealer A (manufactured by Showa Polymer Co., Ltd.) having a size of 00 to 60000 was used. As the alkoxysilane-based water repellent, K
BM3103C (manufactured by Shin-Etsu Chemical Co., Ltd.) was used.

The alkoxysilane-based water-repellent was added to the urethane-based sealer with the solid content of the water-repellent being 30% by weight. At this time, the solid content of the alkoxysilane-based water repellent was 10% by weight (Example 1), 30% by weight (Example 2), and 50% by weight (Example 3) of the total solid content.

The state of the obtained mixed paint was confirmed, and the results were shown in Table 1 as no change (○), slight cloudiness (△), and cloudiness (×).
It was shown to. <Comparative Examples 1 to 6> In the same manner as in Examples 1 to 3, the solid concentration of the alkoxysilane-based water repellent was 95% by weight (Comparative Examples 1 and 2) and 50% by weight (Comparative Examples 3 to 5). , 30% by weight
A mixed paint was prepared as (Comparative Example 6). The solid content of the alkoxysilane-based water repellent in the total solid content of the mixed paint and the state of the mixed paint are shown in Table 1, as in Examples 1 to 3.

[0030]

[Table 1]

According to Table 1, when the solid content of the alkoxysilane-based water repellent was 30% by weight or less in advance, the solid content of the alkoxysilane-based water-repellent was increased to 50% by weight based on the total solid content in the mixed paint. Even in this case, it was confirmed that a uniform mixed paint free of cloudiness was obtained (Examples 1 to 3).

On the other hand, when the solid content concentration of the alkoxysilane-based water repellent is 50% by weight or more, the solid content of the alkoxysilane-based water-repellent is increased with respect to the total solid content in the mixed paint. (Comparative Examples 1 to 5).

Further, even when the solid concentration of the alkoxysilane-based water repellent is 30% by weight, the mixing is performed by setting the solid content of the alkoxysilane-based water-repellent to 60% by weight based on the total solid content in the mixed paint. It was shown that cloudiness of the paint was likely to occur (Comparative Example 6). <Examples 4 to 8> Waterproofness test, frost damage resistance test, and coating film adhesion test (1) Preparation As a ceramic-based substrate, a cement-based substrate manufactured by a papermaking method was used. As the urethane-based sealer, a multi-sealer A having a weight average molecular weight of 45,000 to 60,000 is used.
(Manufactured by Showa Polymer Co., Ltd.) or a weight average molecular weight of 1500
Using any one of Luril (from Nippon Paint Co., Ltd.) of 0 to 25,000, mixing with an alkoxysilane-based water repellent KBM3103C (manufactured by Shin-Etsu Chemical Co., Ltd.) diluted to have a solid content of 30% by weight. And

The obtained mixed paint is applied in an amount of 20 to 30 g.
/ M ² was applied with a brush to the cut part of the ceramic substrate. (2) Waterproofing test A cut portion of a 150 × 300 mm substrate was bonded, a 60 × 200 mm frame was fixed to the surface including the bonded portion, and a portion other than the cut portion was waterproof-sealed. 20mm height inside the frame
And a water permeability test was performed for 24 hours.

The water permeability was determined by the following equation.

[Substrate weight (g) after 24 hours-initial substrate weight (g)] / cut area (m ² ) (3) Frost resistance test A mixed paint was applied to the cut part of the ceramic substrate. ASTM
A cellophane tape peeling test was performed after 200 cycles using the -B method. (4) Coating film adhesion test of top coat After applying the mixed paint to the cut part of the ceramic base material, V-Seran # 600DK (manufactured by Dainippon Paint Co., Ltd.) was applied to obtain a top coat. The coating film adhesion of the top coat was evaluated by a method according to JIS 5422-7-7.

The results of the waterproofness test, the frost damage resistance test, and the coating film adhesion test for Examples 4 to 8 are shown in Table 2.

However, in the waterproof test, the water permeability was 50
0 g / m ² or less (◎), 500~1000g / m less than ² (○), ^1000~3000g / m less than ² (△), 30
00 g / m ² or more (×).

In the frost damage resistance test, the peeling rate was 5% or less (○), 5 to less than 10% (△), and 10% or more (x).

In the coating adhesion test of the top coat,
The peel rate was 5% or less (（) and larger than 5% (×). <Comparative Examples 7 to 8> As ceramic-based substrates, the same ones as in Examples 4 to 8 were used.

Without mixing with an alkoxysilane-based water repellent, only Multi Sealer A (manufactured by Showa Polymer Co., Ltd.) was applied to the cut portion of the ceramic base material, and a waterproof test and a resistance test were performed in the same manner as in Examples 4 to 8. A frost damage test and a coating film adhesion test of a top coat were performed.
(Comparative Example 7) Further, the same KBM3103C (manufactured by Shin-Etsu Chemical Co., Ltd.) as in Examples 4 to 8 was used as an alkoxysilane-based water repellent, and an SB sealer containing a polymer having a molecular weight of 10,000 (Natco Co., Ltd.) was used as a urethane-based sealer. ) Was prepared, and applied to the cut portion of the ceramic base material, and a waterproof test, a frost damage test, and a top coat paint adhesion test were performed in the same manner as in Examples 4 to 8. (Comparative Example 8) The results of the waterproofness test, the frost damage resistance test, and the coating film adhesion test for Comparative Examples 7 to 8 are shown in Table 2 as in Examples 4 to 8.
It was shown to.

[0042]

[Table 2]

According to Table 2, the weight average molecular weight was 15,000
A coating inorganic building material obtained by applying a mixed paint obtained by mixing an alkoxylan-based water repellent with a urethane-based sealer containing a polymer of 60,000 has high waterproofness, frost resistance, and coating film adhesion. It has been shown. Further, when the solid content of the alkoxysilane-based water repellent in the total solid content in the mixed paint was 30% by weight or more (Examples 5, 6,
8) It was confirmed that the waterproofness of the obtained painted inorganic building material was particularly high.

On the other hand, when the alkoxysilane-based water repellent was not used (Comparative Example 7), the waterproofness and the frost resistance of the painted inorganic building material were low, and the weight average molecular weight of the polymer in the urethane-based sealer was 10,000. It was shown that the coated inorganic building material obtained by applying the mixed paint (Comparative Example 8) to the cut portion of the ceramic base material had low waterproofness, frost damage resistance, and coating film adhesion. .

[0045]

As described above in detail, according to the present invention, a mixed paint obtained by mixing a urethane-based sealer containing a polymer having a molecular weight of 15,000 to 60,000 and an alkoxysilane-based water repellent is applied to a cut portion. As a result, the fragile layer of the cut portion is effectively reinforced, high waterproofness and frost damage resistance are provided, and a new painted inorganic building material having long-lasting coating film adhesion is provided.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C09D 183/04 C09D 183/04 4J038 C09K 3/10 C09K 3/10 D Z 3/18 101 3/18 101 104 104 E04F 13/14 102 E04F 13/14 102A (72) Inventor Yukio Shimada 1048 Kadoma Kadoma, Kadoma-shi, Osaka Matsushita Electric Works, Ltd. (72) Yasuo Yabunaka 1048 Kadoma Kadoma, Kadoma-shi, Osaka Matsushita Electric Works Co., Ltd. In-house F-term (reference) 2E110 AA12 AA14 AA27 AA47 AB02 AB04 AB22 BA02 BA12 BB04 GA23X GA33X GB54W 4D075 CA13 CA31 CA31 CA38 DA06 DB12 DB14 DC02 EB38 EB43 EB47 EB56 EC08 EC43 EC54 4G028 CA01 CB05 4H017 A04 AB03 AC04 4J038 DG031 DG032 DL031 DL032 DL041 DL042 MA14 NA04 NA12 PA18 PB05 PC03 PC04

Claims (3)

[Claims] 1. An inorganic building material whose surface is painted,
A mixed coating obtained by mixing an alkoxysilane-based water repellent and a urethane-based sealer containing a polymer having a weight-average molecular weight of 15,000 to 60,000 is applied to a cutting portion of a ceramic base material. Painted inorganic building materials. 2. The coated inorganic building material according to claim 1, wherein the mixed coating material is obtained by mixing an urethane-based sealer with a solid content of the alkoxysilane-based water-repellent agent of 30% by weight or less. 3. The coated inorganic building material according to claim 1, wherein the solid content of the alkoxysilane-based water repellent in the mixed paint is not more than 50% by weight of the total solid content of the mixed paint.