JPH10259322A - Multicoating-type plaster-like finish coating material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a finish coating material which has a viscosity enabling application with various applicating means and can form a thick coating film free from sagging or curtaining and improved in adhesiveness, humidity- controlling properties, water resistance, durability, and matte feeling by compounding a synthetic resin emulsion with a colloidal silica, a specific diatomaceous earth, and an inorg. powder in a specified wt. ratio. SOLUTION: This coating material is prepd. by compounding 100 pts.wt. (solid basis) synthetic resin emulsion obtd. by the emulsion polymn. of a monomer having a polymerizable double bond with 10-50 pts.wt. amorphous colloidal silica having a diameter of several nm to several tens of nm, 50-300 pts.wt. diatomeceous earth having an average particle size of 1-20 μm and a bulk density of 0.2-0.6 g/cm<3> , 200-1,000 pts.wt. inorg. powder other than diatomaceous earth and having a bulk density of 0.2-0.6 g/cm<3> , and, if necessary, other additives such as an org. or inorg. pigment, a plasticizer, an antiseptic, an antifoaming agent, a dispersant, a thickener, and a drying adjusting agent in a ratio of diatomaceous earth to the inorg. powder of (1:1)-(1:10).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-paint stucco-like finish coating material which can be sprayed, troweled, rolled and brushed on inner and outer wall surfaces of a building or the like and which is excellent in design.

[0002]

2. Description of the Related Art Stucco walls, in which plaster is applied to the surface of a wooden building by troweling, have been widely used as a traditional finish of Japanese-style architecture since ancient times. This plaster is excellent in breathability, dew condensation prevention, fire protection, etc.,
Natural texture and warm texture can be imparted to the surface of the building.

[0003] On the other hand, in the case of architectural finishing paints, coloring pigments, calcium carbonate, talc,
A so-called emulsion paint containing an extender such as clay, or a mixture of the same pigment in a synthetic resin solution or non-aqueous emulsion, applied thinly with a brush or roller to give a skin close to a stucco-like surface Also, there are decorative finish coating materials which add an aggregate such as silica sand or cold water stone to the paint, apply thickly with a trowel or a roller, give a design, and give a natural texture.

[0004]

However, the plaster walls are apt to weather, are poor in waterproofness, and have problems in durability and weather resistance. Emulsion paint and the like are thin-coating type coating materials, and have a plaster-like texture on the surface, but have no voluminous feel, and require careful ground adjustment at the time of painting.

[0005] Furthermore, a decorative finish coating material in which an aggregate such as quartz sand or cold water stone is added to the paint can provide a sense of volume, but lacks the calm matte feeling of plaster walls and the smoothness of the surface. The texture was indescribable with plaster.

[0006] In particular, regarding the smoothness of the surface, it is possible to apply the same coating material by any of a plurality of coating means such as spraying, trowel, roller, brush, etc., and the formed coating film surface is smooth. It was difficult to obtain such a finish coating material. The reason for this is that the plurality of coating means are very different in how shear stress is applied to the coating material at the time of each coating, so that the degree of smoothing (hereinafter referred to as “leveling”) is adjusted and the surface tension is adjusted. Is different.

In general, the leveling property of a coating material depends on the viscosity of the coating material and the surface tension of the coating material on the coating film surface. Evaporation of solvent (including water) in coating material
Since it is not microscopically uniform, the distribution of surface tension becomes non-uniform, vortex movement occurs in the coating film, and the coating film becomes smooth. In order to prevent such a coating film having a citrus skin form, it is common practice to adjust the viscosity of the coating material to obtain a good leveling property.

[0009] Even in the case of painting with a brush, iron, or roller, it is necessary to adjust the viscosity to a leveling good so as not to cause streaks. However, that the leveling is good, on the contrary, because it will cause sagging and loosening of the coating material in the undried period immediately after coating, poor coating workability in thick coating material,
This results in impairing the design of the finally formed coating film.

On the other hand, since such a coating material uses an inorganic or organic binder using water as a solvent, for example, a synthetic resin emulsion, cement or the like, it takes a long time to dry the coating film, and the coating material can be used outdoors. In the case of painting, there are problems such as being washed away by rainfall and being unable to enter the interior for a long time if indoors.

[0011] Furthermore, at the time of painting, it is necessary to apply a primer material prior to painting a finish coating material for the purpose of improving adhesion to the base and alkali sealing properties. Was supposed to be longer.

In recent years, it has become popular to use such a material to be thickened as an interior coating material. However, such an interior coating material is used to prevent the occurrence of mold and the like due to dew condensation in a room. It is necessary to have a humidity control function of absorbing and releasing indoor moisture.

[0013] Further, not only a smooth coating film, but also from the viewpoint of improving the design of the painted surface, it is necessary that various patterns can be formed.

Therefore, the first problem to be solved by the present invention is that while having a viscosity capable of being applied by a plurality of coating methods such as spraying, a trowel, a roller and a brush, and having a film thickness of about 1 mm, Multi-coating that does not cause sagging or sagging, has a smooth coating surface, is more water-resistant and more durable than conventional plaster walls, and produces a matte-like feeling like plaster walls To obtain a plaster-like finish coating material.

Second, the second problem to be solved by the present invention is that the above-mentioned multi-paint type plaster-like finish coating material does not require an undercoat for the purpose of shortening the construction period, and is relatively early after coating. The dried and formed coating film has a humidity control function in a room, and has excellent design properties capable of imparting various patterns to the coating film.

[0016]

Means for Solving the Problems The inventors of the present invention have made intensive studies to solve such problems, and as a result, a colloidal silica and a specific particle size and bulk density have been added to a synthetic resin emulsion. By mixing diatomaceous earth and other inorganic powder in a specific ratio, thick coating is possible, and viscosity suitable for various coating methods such as spraying, trowel, roller and brush is obtained, A multi-coat stucco-like finish with excellent water resistance and durability, which can provide a highly rich pattern, has been obtained.

That is, A. With respect to 100 parts by weight of the solid content of the synthetic resin emulsion, B. B. Colloidal silica in a solid content of 10 to 50 parts by weight; Average particle diameter 10-20 μm, bulk density 0.2-0.6
B. 50 to 300 parts by weight of diatomaceous earth of g / cm ³ , Average particle size 1-20 μm, bulk density 0.2-1.2 g
/ Cm ³ of the inorganic powder other than the diatomaceous earth
A multi-paint stucco-like finish coating material comprising 00 parts by weight, wherein the mixing ratio of diatomaceous earth and inorganic powder is in the range of 1: 1 to 1:10 by weight. It is.

[0018]

Embodiments of the present invention will be specifically described below.

First, usable synthetic resin emulsions include those obtained by emulsion polymerization of a monomer having a polymerizable unsaturated double bond, or emulsification of a previously synthesized resin using an emulsifier in an aqueous dispersion medium. Any of these may be used, and a reaction-curable cross-linking type, that is, a type of self-crosslinking inside emulsion particles, or a two-part curing type of adding a crosslinking agent to cause a crosslinking reaction may be used. Further, a powder type emulsion may be used. However, in the case of the powder type, it is necessary to add water at the time of use.

The types of these synthetic resin emulsions include polyvinyl acetates, polyacrylates, and the like.
Acrylate-styrene copolymer, ethylene-
Vinyl acetate copolymer, vinyl acetate-acrylate copolymer, ethylene-vinyl chloride copolymer, vinyl acetate-veova copolymer, urethane, epoxy,
At least one of silicon-modified acrylic, fluorine, and the like is used.

Colloidal silica is made of amorphous silica (Si
O ² ) are particles having a diameter of about several nm to several tens of nm and are usually dispersed in water to form a colloid. In water, these colloidal particles have -SiOH groups and -OH ^- ions on the surface, an electric double layer is formed by alkali ions, and the particles are stabilized by repulsion between the particles.

This colloidal silica gels and agglomerates when the particles are joined together when the charge balance on the surface is lost due to the evaporation of water as a dispersion medium.

In the present invention, the colloidal silica and diatomaceous earth are used together because the surface of the coating film tends to be very porous, the coating film itself has a humidity control effect and a drying promotion effect, and light is not easily emitted. Diffuse reflection makes it easier to form a matte coating such as a plaster wall. The shape of the porous diatomaceous earth and the fineness of the colloidal silica particle diameter in nanometers that can pass through the pores of such diatomaceous earth create an appropriate flow viscosity and provide a leveling adjustment function in various coating methods I do. For that reason.

As such diatomaceous earth, an average particle diameter of 1
A material having a volume of 0 to 20 μm and a bulk density of 0.2 to 0.6 g / cm ³ is used.

When the average particle size is smaller than 10 μm, the water absorption increases, the fluidity of the coating material decreases, the drying property of the coating film decreases, the coating film easily cracks, and the thick coating property decreases. descend. When it is larger than 20 μm, the smoothness of the coating film surface is reduced.

When the bulk density is less than 0.2 g / cm ³ , the amount of water absorption increases, the drying property of the coating film decreases, and the fluidity of the coating material decreases. Also, 0.6
If it is larger than g / cm ^3, the fluidity of the coating material will also decrease.

Further, in the present invention, by using an inorganic powder having a specific particle size other than the above-mentioned diatomaceous earth, it becomes easy to form a matte coating film and loses the characteristics of being excellent in leveling property in various coating methods. Instead, it is provided with thickening suitability. In other words, colloidal silica, diatomaceous earth, a combination of specific inorganic powders other than diatomaceous earth, even when thickened, sagging, loosening does not occur, brush, trowel, coating material that does not cause streaks even when painted with a roller I have.

The inorganic powder preferably has an average particle diameter of 1 to 20 μm and a bulk density of 0.2 to 1.2 g / cm ³ .

When the average particle size is smaller than 1 μm,
Cracks are easily caused in the coating film, and the thick coating property is reduced. When it is larger than 20 μm, the smoothness of the coating film surface is reduced, and sagging occurs at the time of coating.

When the bulk density is less than 0.2 g / cm ³ , the fluidity of the coating material is reduced, and the bulk density is reduced to 1.2 g / cm ^3.
If it is larger than m ³ , the smoothness of the surface will be reduced, and it will be difficult to paint smoothly. Also, it is difficult to apply a pattern.

Examples of such inorganic powders include heavy calcium carbonate, clay, talc, kaolin, precipitated barium sulfate, mica and the like.

In the present invention, based on 100 parts by weight of the solid content of the above synthetic resin emulsion, 10 to 50 parts by weight of colloidal silica, an average particle diameter of 10 to 20 μm, and a bulk density of 0.2 to 0.6 g / cm ^3. Diatomaceous earth of 50 to 300 parts by weight, average particle diameter of 1 to 20 μm, bulk density of 0.2 to 1.2
g / cm ³ of the inorganic powder other than the diatomaceous earth is 200 to 1
By adding the diatomaceous earth and the inorganic powder in a mixing ratio of 1: 1 to 1:10 by weight, the desired fluidity, thick coating property, design property, and texture can be obtained. .

When the amount of the colloidal silica is less than 10 parts by weight, the permeability to the base material when the undercoat material is not used becomes insufficient, and the effect of adhesion when the undercoat material is not used is hardly exhibited. . If the amount is more than 50 parts by weight, the coating film performance such as water resistance and durability of the formed coating film is reduced.

When the amount of the diatomaceous earth is less than 50 parts by weight, the coating material does not have excellent fluidity and the matting effect is not sufficient, and a plaster-like texture cannot be obtained. Further, the formed coating film cannot sufficiently exhibit the humidity control function. If the amount is more than 300 parts by weight, the fluidity of the coating material becomes too large, causing sagging during coating. Further, the coating film performance such as waterproofness and durability of the formed coating film is deteriorated.

When the amount of the inorganic powder is less than 200 parts by weight, the thick coating property is reduced, the matting effect cannot be obtained,
When the amount is more than the weight part, smoothness of the coating film surface cannot be obtained.

When the mixing ratio of the diatomaceous earth and the inorganic powder is out of the range of 1: 1 to 1:10, it is difficult to obtain the desired fluidity, thick coating property, designability that can be easily patterned, and texture. .

In the present invention, if necessary, titanium oxide, zinc oxide, carbon black, ferric oxide (bengara), lead chromate (molybdate orange), graphite,
Inorganic pigments such as yellow iron oxide, ocher, ultramarine, cobalt green, etc., azo, naphthol, pyrazolone, anthraquinone, perylene, quinacridone, disazo, isoindolinone, benzimidazole, phthalocyanine, quinophthalone Organic pigments such as organic pigments can be added in a range that does not impair the effects of the present invention.

As additives for paints, generally used plasticizers, preservatives, defoamers, dispersants, thickeners, drying regulators, fungicides, antialgal agents, antibacterial agents, deodorants, deodorants, Deodorants, fragrances and the like can also be used as appropriate.

In the method for producing a multi-coat type plaster-like finish coating material of the present invention, the components described above can be appropriately mixed and produced using equipment capable of mixing the components. When a powder type synthetic resin emulsion is used, the whole can be mixed using a powder mixing facility. In this case, at the time of construction, it is necessary to adjust the viscosity to a level suitable for construction by adding water.

As described above, a feature of the present invention is that it can be prepared at a factory in advance, compared with plaster produced by mixing raw materials such as slaked lime at a construction site.

The multi-coat plaster-like finish coating material of the present invention comprises:
Installed on the inner and outer walls and ceiling of buildings. The foundation to be applied is concrete, cement mortar, ALC panel, extruded board, gypsum board, asbestos slate board, various siding boards, and the like.

The multi-coat plaster-like finish coating material of the present invention comprises:
As described above, it has excellent permeability to the base material, and can be directly coated in general.However, if the condition of the base is poor due to special base or renovation work, it is also possible to use an appropriate primer material etc. it can.

As a method of applying such a previously prepared coating material composition at a construction site, a method of spraying, troweling, roller coating, or brushing can be used. In the case of spraying, a ricin gun, a universal gun, a Jurakugan, or the like is used. By devising the coating method and construction tools, finely adjusting the viscosity of the coating material by water dilution, etc., by patterning with a pattern forming roller, a texture rich in design that is not found in plaster walls It is also possible to get

[0044]

【Example】

(Manufacture of stucco-like finish coating material) * Manufacture of stucco-like finish coating material The raw materials shown in Table 1 were mixed with the raw materials shown in Table 1 while the synthetic resin emulsion was put into a stirring tank and then stirred with a dissolver. It was introduced so as to achieve the ratio. While the stirring was continued, the stirring was terminated in a state where the respective raw materials were almost uniformly mixed, and the mixture was allowed to stand for a while, and then the following test was performed.

(Test method) * Sagging test "JIS A 6021 Roof coating waterproofing material 5.10
400 × 200 × 5mm in accordance with “Sag resistance performance”
"Miracsealer ES" manufactured by SK Chemical Co., Ltd.
It was applied with a spray gun at m ² and dried and cured for 6 hours.
Around the smooth surface, as shown in FIG. 1, a formwork of 10 mm in width and 6 mm in thickness is attached to each side of the flexible board, leaving a margin of 40 mm in width in the longitudinal direction from the end of the flexible board. The stucco-like finish coating material produced as described above was uniformly applied to the concave surface portion formed after being placed and placed horizontally using a mastic roller. Immediately after the application, one side of the mold provided with a 200 mm sag was removed from the test piece, and the entire test piece was then held vertically at 20 ° C. for 24 hours.
Let stand for a while. Thereafter, the state of sagging of the stucco-like finish coating material in the portion from which the mold was removed was visually observed, and those having no sagging were evaluated as ○, and those causing sagging were evaluated as x.

* Dryability test The stucco-like finish coating material produced as described above was applied to a 25 cm x 15 cm x 3 mm glass plate by an applicator for 1 m.
A test piece was prepared by painting with a thickness of m and a width of 10 cm. Immediately after coating, the weight of the test specimen was measured and cured at a temperature of 5 ° C. and a humidity of 65%. 5 hours later, 10 hours later,
After 20 hours, the weight was measured, and the weight loss was calculated. Next, the test specimen was heated at 100 ° C. to a completely dry state and its weight was measured. The difference between the weight at this time and the initial weight was defined as the volatile matter weight. The weight loss after 5 hours, 10 hours, and 20 hours with the volatile content weight being 100,
What percentage was calculated.

* Adhesion strength test "JIS K 5400 General test method for paint 8.7"
According to the "adhesion strength", each mortar board of 70 mm x 70 mm x 20 mm was coated with a 1 mm thick plaster-like finish coating material using a universal spray gun, and the tip diameter was 6 m.
m, and spray-painted at a spray air pressure of 500 kPa. Subsequently, the mortar plate was cured at a temperature of 20 ± 2 ° C. and a relative humidity of 65 ± 10% for 14 days to prepare a test body.
Subsequently, an adhesive was applied to the coating surface of the test piece, a steel jig for pulling the upper portion was gently placed, and the pieces were glued so as to be lightly rubbed, and a weight of about 1 kg was placed thereon and protruded around. The adhesive was removed. After standing for 24 hours, the weight was removed, and a perimeter was cut along the steel jig to a size of 40 × 40 mm until the test plate was reached. Using a steel jig for pulling the lower part and a steel patch, the sample was removed. A tensile force is applied vertically to the surface to determine the maximum tensile load. Divide this value by 1600 to determine the bond strength, and unit area (mm ² )
It was calculated as the bond strength per area. (N / mm ² )

* Water resistance test A flexible board of 80 × 200 × 4 mm, width 70
Each of the stucco-like finishing coating materials previously manufactured in a size of mm × 180 mm × thickness 1 mm was brush-coated. Subsequently, the flexible board was subjected to a temperature of 20 ± 2 ° C. and a relative humidity of 65 ± 10.
% For 14 days to prepare test specimens. Then about 15
The prepared specimen was immersed in a polyethylene container containing deionized water at a temperature of 20 ° C. to a depth of 0 mm. After standing for 3 days in this state, it was pulled up, and the state of the coating film surface was visually observed. At this time, those in which the coating film was swollen, peeled, flowed out or cracked were evaluated as x, and those in which no abnormality was observed were evaluated as o.

* Heat / Cooling Repetition Test Two 80 × 200 × 4 mm flexible boards were each coated with the plaster-like finishing coating material previously produced in a width of 70 mm × length 180 mm × thickness 1 mm. Subsequently, the flexible board was subjected to a temperature of 20 ± 2 ° C. and a relative humidity of 65 ±
The specimen was cured at 10% for 14 days. One of the test pieces thus prepared was immersed in water at 20 ± 2 ° C. for 18 hours, immediately cooled in a thermostat at −20 ± 3 ° C. for 3 hours, and then cooled to another temperature at 50 ± 3 ° C. Heat the sample in a thermostat for 3 hours, and repeat this operation for 24 hours as one cycle.
After repeating for 2 times, it was left in the test room for 2 hours, then the surface of the coating film was visually observed, and compared with the remaining one test piece,
Those having abnormalities such as swelling, peeling and cracking of the coating film were evaluated as x, and those showing no abnormality were evaluated as o.

* Dewproofing test "JIS A 6909 Architectural finish coating material 6.29"
Inner dimensions 150 × 150 ×
A 5 mm metal mold is filled with each of the previously produced stucco-like finish coating materials, and the surface is flattened using a trowel, and the temperature is reduced to 20 ± 2 ° C. and the relative humidity to 65 ± 10%. And cured in a desiccator and dried for 24 hours to prepare a test body. After measuring the mass (W1) of the specimen in advance, it was fixed to the open portion of the container whose upper surface was opened to the size of the specimen so that the plaster-like finish coating material surface faced the inside of the container. Water is put in the container in advance, and the temperature is adjusted to 50 ± 3 ° C. by a heater. 6 in this state
After a lapse of time, the specimen was removed, and the mass (W2) at that time was measured immediately. The anti-dew property was calculated by the following equation. Anti-condensation properties ^{(g / cm 3) = (} W2-W1) /112.5

* Coating workability test (A) Flexible board 4 of 910 × 910 × 4 mm
Spray all-purpose spray gun on the sheet (tip diameter 6mm,
The plaster-like finish coating material previously manufactured was applied by means of a spraying air pressure of 500 kPa), a metal iron, a mastic roller, and a brush. At this time, the coating operation was evaluated as も の when the coating operation was smooth and the surface of the formed coating film was smooth, and × when the coating film was difficult to apply.

(B) Next, when the coated film is not dried,
The roller was rolled while pressing a pattern forming roller on which the uneven pattern was carved against the surface of the coating to form an uneven pattern on the surface of the coating. At this time, those in which the uneven pattern was formed smoothly were evaluated as ○, and those in which the formed uneven pattern collapsed immediately or where no clear uneven pattern was formed were evaluated as x.

(Examples 1 to 3) Using the materials shown in Table 1 to produce a stucco-finish coating material with the composition shown in Table 2, various tests were carried out based on the above test methods. As a result, the mortar surface having excellent water resistance and durability as shown in Table 3 and having no undercoating is JIS A6.
909 multi-layer coating material CE to 0.5 to 0.
The adhesion strength was 9 N / mm ² . 5 for dryness
After an hour, it became 45 to 50% of the total amount of the volatile matter, and it was found that the drying property was relatively excellent.

(Comparative Example 1) Using the materials shown in Table 1, a stucco-like finish coating material was produced in the composition shown in Table 2, and various tests were carried out in the same manner as in Example 1. Since the amount of the diatomaceous earth was less than the specified range of the present invention as in 3, the fluidity of the coating material was poor, and the coating could not be performed smoothly. In addition, the matte feeling of the coating film was inferior, and some glossiness was felt. Further, the coating film was inferior in drying property and dew-proofing property and could not be said to have a humidity control function.

(Comparative Example 2) Using the materials shown in Table 1, a stucco-finish finishing coating material was prepared in the composition shown in Table 2, and various tests were carried out in the same manner as in Example 1. Since the amount of the diatomaceous earth was much larger than the specified range of the present invention as in No. 3, the fluidity of the coating material was reduced and sagging occurred during coating.
Moreover, it was difficult to form a pattern, and the water resistance and durability of the formed coating film were very poor.

(Comparative Example 3) Using the materials shown in Table 1, a stucco-finish finish coating material was prepared according to the formulation shown in Table 2, and various tests were carried out in the same manner as in Example 1. 4, the amount of colloidal silica was less than the specified range of the present invention, so that the effect of improving the adhesion by infiltration into the underlying substrate was insufficient, and the adhesive strength showed a certain value. Interface peeling occurred. In addition, the anti-dew property is insufficient,
The coating film did not have a humidity control function.

(Comparative Example 4) Using the materials shown in Table 1, a stucco-like finish coating material was prepared in the composition shown in Table 2, and various tests were carried out in the same manner as in Example 1. As shown in 4, since the amount of colloidal silica was much larger than the specified range of the present invention, the water resistance and durability of the coating film were extremely poor.

(Comparative Example 5) Using the materials shown in Table 1, a stucco-like finish coating material was produced in the composition shown in Table 2, and various tests were carried out in the same manner as in Example 1. Since the compounding amount of the heavy calcium carbonate as the inorganic powder as shown in No. 4 was smaller than the specified range of the present invention, the thick coating property of the coating material was reduced and sagging occurred during coating. Further, it was difficult to perform patterning, and the formed coating film was glossy, and a plaster-like texture could not be obtained. Furthermore, the coating film was insufficient in dew-proofing property and could not be said to have a humidity control function.

(Comparative Example 6) Using the materials shown in Table 1, a stucco-like finish coating material was produced in the composition shown in Table 2, and various tests were carried out in the same manner as in Example 1. Since the amount of heavy calcium carbonate as the inorganic powder was larger than the specified range of the present invention as in No. 4, the water resistance and durability of the coating film were poor, and the adhesion strength was also poor. Furthermore, the surface of the coating film after coating was very rough, and a smooth surface could not be obtained.

(Comparative Example 7) Using the materials shown in Table 1, a stucco-like finish coating material was produced in the composition shown in Table 2, and various tests were carried out in the same manner as in Example 1. Since the particle diameter and the bulk density of the heavy calcium carbonate as the inorganic powder as shown in No. 4 were larger than the specified ranges of the present invention, sagging occurred at the time of coating, and it was difficult to perform coating smoothly. Further, the surface of the formed coating film was very rough, and a smooth surface could not be obtained.

[Table 1]

[Table 2]

[Table 3]

[Table 4]

[0061]

The present invention has a viscosity that can be applied by various coating means such as spraying, a trowel, a roller, and a brush, and does not cause sagging or sagging at the time of coating while being a thick film.
Dries relatively quickly, and the formed coating film has adhesion, humidity control,
A finish coating material that is excellent in physical properties of a coating film such as water resistance and durability, and has a smooth surface and forms a coating film that produces a matte feeling like a plaster wall.

[Brief description of the drawings]

FIG. 1 is an external view of a flexible board with a form used in a sag test.

[Explanation of symbols]

 a: Formwork b: Sagging allowance

Claims (1)

[Claims] 1. A. Solid content of synthetic resin emulsion 100
For parts by weight: B. Colloidal silica in a solid content of 10 to 50 parts by weight; Average particle diameter 10-20 μm, bulk density 0.2-0.6
B. 50 to 300 parts by weight of diatomaceous earth of g / cm ³ , Average particle size 1-20 μm, bulk density 0.2-1.2 g
/ Cm ³ of the inorganic powder other than the diatomaceous earth
A multi-paint stucco-like finish coating material comprising 00 parts by weight, wherein the mixing ratio of diatomaceous earth and inorganic powder is in the range of 1: 1 to 1:10 by weight.