JPH0240702B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a novel coating composition used for forming transparent and deep natural stone patterns such as marble patterns and granite patterns (hereinafter referred to as natural stone patterns) on the base surfaces of buildings, furniture, ornaments, etc. . Natural stone is often used as a surface decoration material for buildings, furniture, ornaments, etc., and the deep, calm color tones unique to natural stones are widely preferred. However, natural stone has drawbacks such as being expensive and difficult to process, so its application is limited. Various coating compositions consisting of binders and coloring agents have been proposed, which eliminate these drawbacks of natural stone, hide and protect the base surface using an inexpensive and simple construction method, and provide an aesthetic appearance. has been done. These coating compositions can be applied to ricin, tiles (crater-like,
It is possible to form three-dimensional texture patterns such as uneven patterns, stucco patterns, and roller patterns. Organic or inorganic pigments are used as colorants in such coating compositions. However, when pigments are used, the color of the resulting coating layer becomes monotonous and flat. In order to improve this drawback, some have used natural or artificially colored sand of different colors, which has made it possible to obtain a certain degree of complex coloration, but it is far from the deep three-dimensional effect that natural stone has. Only flat color tones are available. The deep patterns unique to natural stones result from the fact that the rock-forming substances that make up natural stones have different crystal shapes, optical properties, and colors, and are mixed in various proportions. In other words, depending on the part of the natural stone surface, there are some types of light that are reflected on the surface, and some that penetrate inside and are reflected and refracted at the interface of the rock-forming material, which overlaps with the surface-reflected light. The combination of these colors gives the viewer a multi-layered, calm, and deep sense of color. Based on such knowledge regarding natural stone, the present inventors have repeatedly studied and blended various materials in order to impart the color tone and pattern of natural stone to the coating layer. We have discovered that a coating composition containing an appropriate amount of aggregate with specific physical properties that is compatible with the coloring agent provides a coating layer with a pattern and deep color tone that closely resemble those of natural stone.
The invention has been completed. That is, the present invention uses a coloring material having a particle size of 0.05 to 8.0 mm, a binder that forms a nearly colorless and transparent film when dried, and an aggregate having the following physical properties (hereinafter referred to as
The present invention relates to a coating composition that forms a natural stone pattern consisting of certain aggregates. The specific aggregate has a particle size of 0.1 to 5.0 mm and a light transmittance of 5 to 5.
It is necessary to have physical properties of 50%.
However, the values shown here are the values obtained by the following measurement method, and slightly different values may be obtained if measurements are made based on other measurement methods or measurement instruments. Light transmittance is a value obtained by measuring particles with a particle size of 0.5 to 1.0 mm in a transparent glass cell to a thickness of 5 mm using a turbidity meter specified in JIS K0101. It is. If the light transmittance is less than 5%, there will be no transparency and the color tone will be flat, and if it is more than 50%, the hiding power will be too low and the pattern will be unclear, and both are not preferred. If the particle size is less than 0.1 mm, the transparency of the aggregate will be lost, and if it exceeds 5.0 mm, the difference in size from the coloring material will become large and the sense of unity will be lost, so both should be avoided. Particularly preferred aggregates have a light transmittance of 8 to 20%. Such aggregates include, for example, feldspar, silica sand, silica stone, anhydrite, and glass beads. The blending amount of the specific aggregate is 5 to 60% (weight %, the same applies hereinafter) based on the total weight of the composition. especially
10-50% is appropriate. When it is less than 5%, a deep color tone cannot be obtained, and when it is more than 60%, only an indistinct color with no adhesive strength is obtained, and workability becomes poor, both of which are undesirable. The deep color tone unique to natural stone can only be obtained by blending this specific aggregate, so it is necessary to carefully consider the type and amount of aggregate to match the desired natural stone pattern. The binder used in the present invention may be any binder used in this field as long as it forms a nearly colorless and transparent film when dried. However, if used outdoors, a material with excellent water resistance and weather resistance must be used. Specific examples thereof include synthetic resin solutions such as acrylate-styrene copolymers, acrylic ester copolymers, ethylene-vinyl acetate copolymers, vinyl acetate-peova copolymers, and terpolymer thereof. Alternatively, emulsions such as reaction-curable synthetic resin solutions such as epoxy resins, urethane resins, and acrylic resins, and emulsions such as inorganic polymer compound solutions such as water glass, colloidal silica, and lithium silicate may be mentioned. The binder is approximately 5 to 20% solids based on the total weight of the coating composition.
%. If it is less than 5%, cracks tend to occur in the formed coating layer, and if it exceeds 20%, it takes time to dry and the cost increases, so both are not preferred. As the coloring material, commonly used materials such as naturally colored sand such as serpentine and fluorite, and artificially colored sand such as crushed ceramic granules and fired silica sand may be used. However, since pigments are extremely fine particles compared to the rock-forming substances of natural stones, they have a large hiding power, making it difficult for irradiated light to penetrate inside the coating layer, and most of the light is reflected from the surface. , giving only a flat color tone to the viewer, which is not desirable. The particle size of the coloring material is selected depending on the natural stone pattern to be formed, and may be in the range of 0.05 to 8.0 mm.
If it becomes too fine, it will cause the same problems as pigments, and if it becomes too large, it will be difficult to apply and the formed coating layer will become unnatural.
Neither is preferable. The amount of colorant added is about 15-55%. If it is less than 15%, a clear color will not appear, and if it exceeds 55%, the proportion of the colored portion of the formed coating layer will become too large, resulting in a flat color tone, which is not preferable. Examples of additives include thickeners, low-temperature stabilizers, film-forming aids, anti-sagging agents, antifoaming agents, etc., and are used within a range of up to 5%. Furthermore, in order to impart appropriate fluidity to the coating composition of the present invention during application, a medium such as water or a solvent may be added. The proportions of the coating composition of the present invention are about 5-20% binder (in solids), about 15-55% colorant and 5-60% specific aggregate, based on the total weight of the composition.
Additives may be included in amounts up to about 5%. When using the coating composition of the present invention, a desired natural stone pattern can be created by appropriately selecting the type and amount of the binder, colorant, specific aggregate, and the like. Representative examples of natural stone patterns that can be formed using the coating composition of the present invention include, but are not limited to, granite patterns, marble patterns, and sandstone patterns. Suitable methods for applying the coating composition of the present invention to the base surface include, for example, a spraying method and a troweling method. Both methods generally consist of the steps of (1) depositing in advance a coating composition that matches a predetermined color tone, and (2) overlaying a coating composition of a different color tone thereon in spots. However, in the case of a type without speckled color, the above step (2) can be omitted. Furthermore, if necessary to add gloss, a transparent synthetic resin solution is applied or sprayed. Next, the coating composition of the present invention will be explained with reference to examples and construction examples, but the present invention is not limited only to these examples.

[Table] Two colors of coating compositions of the present invention were prepared by thoroughly kneading the above components. The specific aggregate used (silica sand) has a particle size of 0.4~
It was 1.4 mm and had a light transmittance of 10%. The light transmittance was measured according to the method described above.

[Table] Two colors of coating compositions of the present invention were prepared by thoroughly kneading the above components. The specific aggregate used (kansuiseki) has a particle size of 0.2
It was ~1.0 mm and had a light transmittance of 13%. The light transmittance was measured in the same manner as in Example 1. Example 3 A coating composition of the present invention was obtained in the same manner as in Example 1, except that 13% of a specific aggregate (kansuite) was used. Construction Example 1 (Granite pattern with pounded finish) The composition (1) obtained in Example 1 was sprayed uniformly to a thickness of 2 to 3 mm onto the base surface of a concrete block wall that had been prepared with a mortar trowel. was hidden. Before this dried, the composition (2) obtained in Example 1 was sprayed in spots. Then, the composition (1) was sprayed in spots. Before the surface of the sprayed coating composition dried, the surface of the coating composition was lightly pressed with a soft-bristle roller (medium-bristle of a wool roller) moistened with water. After drying, an acrylic resin solution that forms a transparent film was applied to complete the tassel-finished granite-patterned covering layer. The formed coating layer had a deep color tone similar to that of natural granite. The specific aggregate content was approximately 18% (calculated value). Construction example 2 (polished marble pattern) The composition (3) obtained in Example 2 was applied to concrete.
It was evenly sprayed onto the mortar base surface to a thickness of 2 to 3 mm to hide the base surface. Before this dries, the composition (4) obtained in Example 2 is sprayed in spots,
Then, before the surface was dry, it was pressed with a stainless steel or plastic trowel to smooth the surface. After drying, a urethane resin solution that forms a transparent film was applied to give the surface a glossy finish, completing a marble-patterned coating layer with a polished finish. The formed coating layer had a deep color tone similar to that of polished natural marble. Please note that when pressing the surface with a trowel,
If the % is left as a worm-shaped valley, a travertine pattern will be created. Furthermore, a similar polished marble pattern can be formed by using a troweling method instead of the spraying method. The content of the specific aggregate was 25% (calculated value). Construction Example 3 Using the coating composition obtained in Example 3, a granite-patterned coating layer with a pounded finish was formed on a base surface in the same manner as in Construction Example 1. The resulting coating layer had a color tone similar to natural granite. Comparative Examples 1-2 Except that 13% each of conventional silica sand and ananseite were used in the composition (1) of Example 1 and 47% each in the composition (2) in place of the specific aggregate (silica sand). A comparative coating composition was obtained by kneading in the same manner as in Example 1. Comparative Examples 3 to 4 Three specific aggregates (silica sand) were added to the composition (1) of Example 1.
Comparative coating compositions were obtained by kneading in the same manner as in Example 1 except that % and 62% were used. Comparative Construction Examples 1 and 2 Using the coating compositions obtained in Comparative Examples 1 and 2, construction was carried out in the same manner as in Construction Example 1 to form a granite-patterned coating layer with a pounded finish. As a result, the conventional product using silica sand was itself considerably colored (light transmittance 3.67%), and the color development of the obtained coating layer was poor. In conventional products using Kansui stone, the granite pattern tended to be unclear. Comparative Construction Examples 3 and 4 The coating compositions obtained in Comparative Examples 3 and 4 were used in the same manner as in Construction Example 1 to form a granite-patterned coating layer with a pounded finish. When the coating composition of Comparative Example 8 was used, only a flat colored coating layer could be obtained. The coating composition of Comparative Example 4 was difficult to apply because the aggregate easily came apart during construction, and the pattern of the resulting coating layer was unclear. Test Example 1 (Sensory Test) The color tone, surface condition, etc. of the coating layers obtained in Construction Examples 1 and 3 and Comparative Construction Examples 1 to 4 were observed with the naked eye, and compared with natural granite. We evaluated the similarity of each. The natural stone was evaluated as 5 and compared with natural stone based on the following criteria. 4: Very similar 3: Somewhat similar 2: Not very similar 1: The difference is obvious The results are shown in Table 1. Note that the similarity value is the average of 10 evaluations.

【table】

Claims (1)

[Scope of Claims] 1. 15 to 55% by weight of a colorant having a particle size of 0.05 to 8.0 mm, 5 to 20% by weight (in solids) of a binder that forms an almost colorless and transparent film when dry, and 0.1 to 5.0% by weight. mm
A coating composition forming a natural stone pattern consisting of 5 to 60% by weight of aggregate having a particle size of Light transmittance (measured value of a 5 mm thick sample consisting of particles with a particle size of 0.5 to 1.0 mm using a turbidity meter specified in JIS K0101): 5 to 50%.