JP2875780B2 - Inorganic paint and rock wool building materials - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inorganic paint used for surface decoration of interior and exterior materials of buildings and a rock wool building material used for ceiling materials and wall materials.

[0002]

2. Description of the Related Art Since building materials used in places where rainwater easily acts, such as eaves ceilings, are required to be water-resistant, organic paints such as vinyl acetate resin and acrylic resin are used in paints used for painting. About 30% by weight (solid content) is blended, but when the blending amount of the organic binder is large in this way, it becomes only semi-flammable.

On the other hand, non-combustibility is important for rock wool building materials. For this reason, the paint used for the coating should be made of an organic binder such as vinyl acetate resin or acrylic resin.
Only a small amount of 0% by weight or less (solid content) can be blended.

[0004]

However, when the amount of the organic binder is such a small amount, the coating film has poor water resistance and abrasion resistance, and has a high coating film hardness and is brittle. There was a problem that it could not be used on a part such as a ceiling where rainwater easily acts. The present invention has been made in view of the above points, an object of the present invention to provide an inorganic paint that forms a coating film having excellent water resistance and excellent flexibility even with a small amount of an organic binder, and An object of the present invention is to provide a rock wool building material that can be used without problems even in a portion where rainwater easily acts.

[0005]

The inorganic paint according to the present invention is characterized by containing an inorganic pigment and a filler and containing lithium silicate and a silicon-modified acrylic resin as a binder. is there.

[0006] The content of the silicone-modified acrylic resin is 3% by weight or more based on the solid content of the inorganic paint.
It is preferably set to not more than weight%. Further, a rock wool building material according to the present invention is characterized in that the above inorganic paint is applied to the surface of a rock wool plate.

[0007]

Embodiments of the present invention will be described below. The inorganic paint according to the present invention is prepared by mixing lithium silicate and a silicon-modified resin as a binder with an inorganic pigment or filler. The blending amount of lithium silicate as an inorganic binder is not particularly limited, but may be 5 to 30 in the solid content of the inorganic paint.
It is preferable to mix them so as to be in a weight%. In order to ensure the nonflammability of the inorganic coating, the amount of the silicone-modified resin, which is an organic binder, is 1% of the solid content of the inorganic coating.
It must be set to 0% by weight or less, more preferably 8% by weight or less. Although the lower limit of the amount of the silicone-modified resin is not particularly set, in order to sufficiently obtain the effect of increasing the water resistance and flexibility of the coating film, it is necessary to set the amount of the solid content of the inorganic paint to 3%.
It is preferable to mix them so as to be not less than% by weight.

In the present invention, as the silicon-modified resin used as the organic binder, it is preferable to use a silicon-modified acrylic resin obtained by mixing or reacting an acrylic resin with a silicon resin. The rock wool building material according to the present invention can be obtained by applying the above-mentioned inorganic paint according to the present invention to the surface of the rock wool sound absorbing plate. Here, the inorganic paint of the present invention obtained as described above contains lithium silicate and a silicon-modified resin as a binder,
The silicon-modified resin can improve the water resistance of the coating film made of the inorganic paint and improve the flexibility to improve the brittleness even with a small amount of 10% by weight or less. Therefore, the rock wool building material coated with the inorganic paint can be used without problem even in a part where water is likely to act, such as an eaves.

[0009]

Next, the present invention will be described specifically with reference to examples. (Examples 1 to 6) As pigments and fillers, titanium oxide, calcium carbonate, and kaolin clay were blended in the amounts shown in Table 1, and lithium silicate and a silicon-modified acrylic resin (manufactured by Showa Polymer Co., Ltd.) were used as binders. 1 and the additives (1 part by weight of a silicon-based defoamer,
2 parts by weight of a carboxylic acid type surfactant, 5 parts by weight of texanol and butyl cellosolve film-forming auxiliary), and
This was dispersed in water to prepare an inorganic paint having a solid content of 60% by weight.

Next, this inorganic paint is coated with a thickness of 9.0 mm,
250g / on the surface of a rock wool sound absorbing plate with a density of 380K
It was applied at a coating amount of m ² (wet) and dried at 150 ° C. for 3 minutes to obtain a rock wool building material having a coated surface. (Comparative Example 1) An inorganic paint having a solid content of 60% by weight was prepared using the composition shown in Table 1 without using a silicon-modified acrylic resin. Thereafter, using this inorganic paint, the above (Examples 1 to
Painted in the same manner as in 6) to obtain a rock wool building material.

With respect to the coating film on the surface of the rock wool building material obtained as described above, the washing resistance, the flexibility of the coating film, the water repellency, and the hardness of the coating film were measured. Washing resistance was evaluated as the number of washings that the coating film could withstand. Evaluation of the flexibility of the coating film,
If the coating film does not peel at all when cutting or nailing, "◎"
も の indicates that the coating around the nail may be missing when nailing, △ indicates that the coating on the tip of the nail is missing when cutting, and × indicates that the coating peels off when cutting or nailing. did. The evaluation of water repellency was “◎” when the contact angle of the water droplet was 90 ° or more, “○” when the contact angle of the water droplet was 90 °, and “△” when the contact angle of the water droplet was 90 ° to 45 °. And those having a contact angle of water droplets of 45 ° or less were evaluated as “×”. Table 1 shows the results. The hardness of the coating film was measured by a pencil scratch test and is shown in Table 1 as pencil hardness.

[0012]

[Table 1]

As shown in Table 1, the coating film of Comparative Example 1 which did not contain a silicone-modified acrylic resin as a binder had poor washing resistance, low flexibility and water repellency, and was hard and brittle. Met. On the other hand, in each of the examples in which lithium silicate and silicon-modified acrylic resin were blended as the binder, the washing resistance was good, the flexibility of the coating film was high, and the water repellency was high. Further, in each of the examples, the compounding amount of the silicon-modified acrylic resin is 10% by weight or less, so that nonflammability can be ensured. In particular, in Examples 1, 2, 4, and 5, the compounding amount of the silicon-modified acrylic resin is small. The content was 8% by weight or less, and the nonflammability was high and the performance as a nonflammable ceiling material was satisfied.

[0014]

Inorganic coating material according to the present invention as described above according to the present invention, together with a pigment and filler of inorganic, a lithium silicate and silicone-modified acrylic resin are those containing as a binder, silicone-modified acrylic resin In addition, it is possible to improve the water resistance of a coating film made of an inorganic paint and to improve the brittleness by increasing the flexibility even with a small amount of 3% by weight or more and 10% by weight or less in the solid content of the inorganic paint. It is.

Further, by making the content of the silicone-modified acrylic resin 3% by weight or more and 10% by weight or less based on the solid content of the inorganic paint, the amount of the organic binder is reduced and the non-flammability of the coating film is ensured. Can be done.

The rock wool building material according to the present invention is characterized in that the above-mentioned inorganic paint is applied to the surface of a rock wool plate, and the coating film of the inorganic paint is water-resistant. The rock wool building material can be used without hindrance even in areas where water is likely to splash, such as the eaves.

Claims (3)

(57) [Claims] Claims: 1. An inorganic pigment and filler are contained.
An inorganic paint comprising both lithium silicate and a silicon-modified acrylic resin as a binder. 2. The content of the silicone-modified acrylic resin is zero.
The inorganic paint according to claim 1 , wherein the content is 3% by weight or more and 10% by weight or less in the solid content of the mechanical paint. 3. A rock wool building material obtained by applying the inorganic paint according to claim 1 on a surface of a rock wool plate.