JP5580509B2 - Water-based coating material composition, construction method thereof, and wall structure thereby - Google Patents

Description

  The present invention relates to a mud wall-like construction method, a wall structure, and a composition that expresses the function and design of the mud wall style.

  In the past, the soil walls were made of bamboo and wood, made into a wooden dance, and soil was applied to both sides in order and finished with plaster as a finish. This wall sucked moisture and was hard to burn. However, the construction period was long, and many things depended on the intuition and experience of craftsmen, such as the availability of raw materials and the preparation of materials. However, there are cases where a clay wall-like coating material is applied to a plaster board or the like due to functional requirements such as the design of the earth wall, but the design and durability are not satisfactory.

  Further, it has been a technical problem that the synthetic resin wall coating material does not generate cracks due to the function of the walls, that is, so-called cracks, and appearance cracks have been avoided from the function of the walls. However, the texture of the earthen wall with cracks is thought to increase the range of choice in terms of design, calm and heal people. In order to generate cracks in the earth wall, it is necessary to adjust the viscosity by blending clay and sand. In addition, high plastering skills are required in construction, and it does not pursue the physical properties of the wall. It was.

Proposed to form a sandstone coating film by using a synthetic resin emulsion, a synthetic fiber of a specific fiber length, a colored aggregate of a specific particle size, and a composition containing a specific ratio of inorganic powder and polyethylene oxide. In the process, it is described that cracks are generated due to a difference in conditions such as drying of irregularities. (Patent Document 1)
Japanese Patent Laid-Open No. 10-1624

  However, methods, compositions, and wall structures that exhibit the durability of synthetic resin coating materials and various design features from ancient Japan have not appeared.

  The problem to be solved is a composition that has various textures and designs of earthen walls, has humidity control, and develops a natural cracking state that occurs on the earthen walls, and cracks due to aging of the foundation There is no construction method, in providing the wall structure.

The invention of claim 1 is a water-based coating material composition comprising a synthetic resin emulsion, clay, silt, sand, and water, wherein the moisture absorption / release amount of JISA6909 is 70 or more when applied at 2.0 kg / m ² , and is volatilized. The weight excluding the weight is 100% by weight, the solid content of the synthetic resin emulsion is 6 to 10.14% by weight, the clay and silt is 26 to 35% by weight, and the sand is 55 to 65% by weight. It is a water-based coating material composition characterized by being generated, can generate cracks in the dried coating film, hardly scratches the surface, has a mud wall-like design and good design.

 The invention according to claim 2 is the water-based coating material composition according to claim 1, characterized in that the synthetic resin emulsion is an acrylic resin-based emulsion, and has excellent adhesion and good coating film properties.

 The invention according to claim 3 is characterized in that it comprises a synthetic resin emulsion type finish coating material defined in JIS A6909, a soil for earth wall made of clay and silt, sand and water. It is a product, and a texture like a clay wall can be easily produced, cracks can be generated in the dried coating film, the surface is hard to be damaged, and the earth wall design is good.

  The invention according to claim 4 is the aqueous coating material composition according to claim 3, characterized in that the synthetic resin emulsion-based finish coating material defined in JIS A6909 is an acrylic resin emulsion, and the effect of claim 3 In addition, it has excellent adhesion and good physical properties.

  The invention of claim 5 is characterized in that the water-based coating composition according to any one of claims 1 to 4 is applied after forming a coating film having irregularities with a synthetic resin emulsion-based finish coating material defined in JIS A6909. It is a wall surface construction method, and has a soil-like texture, humidity control, can follow the movement of the ground, and has a durable wall structure.

  The invention of claim 6 is a wall structure formed by the wall surface construction method according to claim 5, has a soil wall-like texture, has humidity control, changes with time of the foundation, etc. Follows the movement of the wall and does not cause cracks that impair the function of the wall.

  According to the present invention, the water-based coating composition has a texture of the earth wall, has humidity control, generates cracks along with the texture of the earth wall, and cracks that impair the function of the wall even when the earth wall style changes over time. A design wall with a natural texture that does not cause rust, and a variety of designs can be expressed by combining conventional designs of water-based coating materials.

  The present invention has a texture of soil walls, moisture absorption and desorption, corresponds to a seismic wall structure, and can also be used for assembling the foundation during construction. Conventional earthen walls have a long construction period and are often based on the experience of craftsmen, and are difficult to cope with the current architecture. Gypsum board is often used for the interior of the current interior, even if it is a conventional method or a two-by-four method. Will cause cracks that impair the function of the wall, and fastness and adhesion to the substrate alone are not sufficient. Cracks that impair the function of the wall due to aging by applying the emulsion-based coating material specified in JIS A6909 as the base material to the normal construction base and applying the aqueous coating composition of the present invention. Invented a wall structure that has a design and function of earthen walls that does not cause any problems. Synthetic resin emulsion, clay, silt, sand, combination of individual properties, design such as cracks, texture design of earth wall, durability as wall structure, scratch resistance, each composition below I will write about the method.

Synthetic resin emulsions Synthetic resin emulsions are acrylic acid ester copolymer resins, vinyl acetate resins, ethylene / vinyl acetate resins, vinyl acetate / acrylic ester resins, ethylene / vinyl chloride resins, silicon-modified acrylic resins. Resin emulsions such as urethane resins can be used, with no film-forming aid added, having a film-forming temperature that is lower than the construction temperature, or by adding a film-forming aid to achieve the film-forming conditions under the operating conditions. ,good. These can be used even in a cross-linked type, powder type emulsion and the like. Of these, acrylic resin emulsions such as acrylic acid ester copolymer resins are preferable because they have good coating film properties after drying the coating material. Examples of film forming aids include texanol. The solid content of the synthetic resin includes a film forming aid.

The soil for soil walls is a plastering soil generally used for soil walls, such as Awaji soil, shallow yellow soil, yellow soil, white soil, and Kyoto rust soil, and those according to this can also be used.

Clay, silt, sand clay, silt, and sand are classified by particle size according to the classification in the Japan unified soil classification. Clay is less than 5 μm, has low water permeability, and exhibits adhesive strength during water retention, but is classified by particle size. Natural clay, clay, talc, diatomaceous earth, bentonite and the like can be mentioned. The silt is 5 to 75 μm, and the soil for soil wall contains clay, silt and sand. Calcium carbonate powder, silica stone powder, cold water stone powder, etc. are classified into silt and sand according to the particle size depending on the degree of pulverization.

  The sand is a granular material of 75 μm to 1.5 mm such as natural river sand, fine sand, quartz sand, calcium carbonate powder, cold water stone powder, and various pulverized powders.

Form of water-based coating composition The form of the water-based coating composition for obtaining the effects of the present invention is as follows. The weight of the synthetic resin-based emulsion is 2 to 10.14 % by weight based on 100% by weight excluding volatile components. , Clay and silt (earth wall soil) 25 to 35% by weight, sand 55 to 73% by weight is preferable, of which the same solid content as described above is set to 100% by weight as the solid content of the synthetic resin emulsion to cause cracks. 6 to 10.14 % by weight, clay and silt (earth wall soil) 26 to 35% by weight, and sand 55 to 65% by weight are preferable. Clay, silt, and sand may be added to a commercially available water-based coating material, a synthetic resin emulsion-based finishing coating material defined in JIS A6909. Titanium oxide, extender pigments, and the like are used for coating materials and paints for the purpose of concealing and coloring. The addition amount is adjusted according to the particle size. When the water-based coating material is used, soil wall soil and sand may be added. Examples of the water-based coating material include Aika Jolipat JP-100 and JQ-650 (both are trade names) manufactured by Aika Industry Co., Ltd.

Construction method Apply sealer to mortar, gypsum board, plywood, etc. if necessary. After drying, an undercoat material that serves as a base for the aqueous coating material composition of the present invention is applied. Undercoat materials are exterior coating materials E, flexible exterior coating materials E, interior coating materials E, exterior coating materials E, interior coating materials E, etc., as defined in JIS A6909. The surface is made uneven with rough or rough sand (0.5 to 2.5 mm). The size and density of the unevenness can be changed depending on the size and amount of the sand to be added. As a result, the adhesive force is improved, the strength of the base material is improved, the cracks are made uniform, and the shape is changed as desired. Although there is no restriction | limiting in the kind of this sand, Cold water stone is preferable at the wear of an applicator, that the particle size is uniform, availability, etc. The addition amount is preferably the same part by weight or less with respect to the coating material. The undercoat material needs to be 1.0 kg / m ² or more, and if it is small, zero span, that is, cracks in actual use are likely to occur. After drying the undercoat material, the aqueous coating material composition of the present invention is finished with a predetermined coating thickness iron according to the desired design. This undercoating material covers water resistance and water impermeability, and there is no deterioration in wall performance due to cracks. By applying 2.0 kg / m ² or more of the aqueous coating material composition as the finishing material, the moisture absorption / release property defined in JIS A6909 is 70 or more.
As the design material, it is also possible to use, as a design material, a soil wall used for reinforcement and crack prevention, i.e., haze, paper, hemp. Due to the length of the bush and the nature of the material, the effect on cracking is in the thousands, but in combination with the present invention, it is possible to create a design that produces the peacefulness of natural materials.

Coating material formulation example Acronal YJ-1701D (trade name, manufactured by BASF Dispersion Co., Ltd., acrylic resin emulsion, solid content 55%, MFT 20 ° C.) 25 parts by weight, Texanol CS-12 (Chisso Corporation) )) 1.5 parts by weight, calcium carbonate powder (average particle size 25 μm) 10 parts by weight, meteorite powder (average particle size 150 μm) 46 parts by weight, titanium white (titanium oxide, pigment) 3.5 parts, water 14 weights Parts were blended, mixed and stirred to obtain an aqueous coating material A. This coating material A can satisfy the specifications applicable to the JISA 6909 exterior thin coating material E.
Hereinafter, Examples 1 to 6 and Comparative Examples 1 and 2 were blended using the aqueous coating material A, and the evaluation results are shown in Table 1.

  30 parts by weight of coating material A, 22 parts by weight of white clay (made by Kinki Wall Materials Co., Ltd.) as soil for soil walls, 15 parts by weight of Kawasago No. 5 (manufactured by Nakanai Construction Materials Store), 5 kg of cold water stone ( Calfine Fine Co., Ltd. 1.5 mm) was mixed with 15 parts by weight and 18 parts by weight of water to obtain an aqueous coating material composition of Example 1.

  32 parts by weight of coating material A, 16 parts by weight of white clay (manufactured by Kinki Wall Materials Co., Ltd.) as soil for soil walls, 16 parts by weight of Kawasago No. 5 (manufactured by Nakanai Construction Materials Store), 5 kg of cold water stone ( Aqueous coating of Example 2 was blended with 16 parts by weight of Calfine Co., Ltd. (1.5 mm), 0.3 parts by weight of Sasasa (Naka Co., Yabu), and 19.7 parts by weight of water. A material composition was obtained.

  42 parts by weight of coating material A, 14 parts by weight of white soil (made by Kinki Wall Materials Co., Ltd.) as soil for soil walls, 14 parts by weight of Kawasago No. 5 (manufactured by Nakanai Construction Materials Store), 5 kg of cold water stone ( Calfine Fine Co., Ltd. 1.5 mm) 14 parts by weight and 16 parts by weight of water were blended to prepare an aqueous coating material composition of Example 3.

48 parts by weight of coating material A, 12 parts by weight of white clay (made by Kinki Wall Materials Co., Ltd.) as soil for soil walls, 12 parts by weight of Kawasago No. 5 (manufactured by Nakanai Construction Materials Store), 5 kg of cold water stone ( The water-based coating of Example 4 was blended with 12 parts by weight ( 1.5 mm manufactured by Calfine Co., Ltd.), 0.3 parts by weight Sasa (Naka Co., Ltd., Yabuhara Co., Ltd.), and 15.7 parts by weight water. A material composition was obtained.

  13 parts by weight of coating material A, 19 parts by weight of white clay (produced by Kinki Wall Materials Co., Ltd.) as soil for soil walls, 52 parts by weight of fine sand (manufactured by Nakanai Building Materials Store), Yab Original Co., Ltd.) 0.3 parts by weight and 15.7 parts by weight of water were blended to prepare an aqueous coating material composition of Example 5.

  31 parts by weight of coating material A, 16 parts by weight of white clay (manufactured by Kinki Wall Materials Co., Ltd.) as soil for soil walls, 41 parts by weight of fine sand (manufactured by Nakanai Kensakuten), Yab Original Co., Ltd.) 0.3 parts by weight and 11.7 parts by weight of water were blended to prepare an aqueous coating material composition of Example 6.

Comparative Example 1
54 parts by weight of coating material A, 8 parts by weight of white clay (made by Kinki Wall Materials Co., Ltd.) as soil for soil walls, 11 parts by weight of Kawasago No. 5 (manufactured by Nakanai Construction Materials Store), 5 kg of cold water stone ( Calfine Fine Co., Ltd. 1.5 mm) 14 parts by weight and 13 parts by weight of water were blended to prepare an aqueous coating material composition of Comparative Example 1.

Comparative Example 2
No coating material A is added, 14 parts by weight of white clay (Kinki Wall Materials Co., Ltd.) is used as soil for soil walls, 57 parts by weight of fine sand (manufactured by Nakanai Construction Materials Store) and 29 parts by weight of water are used as sand. Thus, an aqueous coating material composition of Comparative Example 2 was obtained.

Other Comparative Examples The results shown in Table 1 of Examples 1 to 6 were obtained by applying the water-based coating material A as the undercoat material. Moreover, although only the coating material A was apply | coated instead of the Example, the result of the moisture absorption / release property test prescribed | regulated to humidity control property, ie, JISA6909 (finishing coating material for construction) was 25 or less.

Evaluation method Appearance evaluation: An experiment was conducted at 25 ° C. in a windless room. Jolipat Sealer JS-500 (acrylic resin emulsion system, product name) manufactured by Aika Kogyo Co., Ltd. was applied to a 1m square plaster board and dried. (1.0 mm manufactured) 50 parts by weight were blended and dried at 1.5 kg / m ² . The aqueous coating material compositions of Examples 1 to 6 and Comparative Examples 1 and 2 were applied to this at 2 kg / m ² and air dried.

  Crack design: Appearance after application was evaluated. Observed from a distance of 1 m, cracks could be confirmed, and those with overall uniformity were marked with ◯, those with no cracks confirmed or with no uniformity were marked with ×.

  Earth wall design: Observed in the same manner as the cracked design, “O” indicates that the texture of the entire earth wall is on the whole, and “×” indicates that the texture of the synthetic resin emulsion coating material is partly.

Adhesion strength: In accordance with JIS A6909 (architectural finishing coating material), a standard adhesion strength test was performed. The test specimen was a 70 x 70 mm mortar plate coated with the coating materials of the examples and comparative examples, and the specimen was cured for 14 days at 23 ° C and 65% relative humidity, and an upper tensile steel jig was bonded. Measurements were made. The load was pulled at 1500 N / min, the maximum tensile load was measured, and the adhesion strength (unit: N / mm ² ) was calculated.
The mortar board was formed by molding a mortar prepared by the method specified in 10.4 of JIS R5201 (how to make a specimen) using a metal mold with an inner dimension of 70 × 70 × 20 mm, and a temperature of 20 ± 2 ° C. After leaving for 24 hours at a humidity of 80% or more, demolding, then curing in water at 20 ± 2 ° C. for 6 days, and further leaving in a curing room for 7 days or more, then stipulated in JIS R6252 150 It is assumed that the lower surface at the time of molding is sufficiently polished using the number polishing paper.

  Zero span: 70 mm × 70 mm × 6 mm slate base materials were butted together, applied with the formulations of Examples and Comparative Examples, and allowed to stand at 23 ° C. and 50% relative humidity for 14 days and then measured with a universal testing machine. . The tensile speed was 2 mm / min, and the distance when a new crack was generated at a portion other than the cracked portion or the distance when a crack extending from the ground to the surface at the cracked portion was defined as the zero span distance (unit: mm). The distance is the distance that the butting surface 2 in FIG. 4 has moved from the initial value of 0 mm according to the tension. As an evaluation, those having a zero span distance of 0.4 mm or more were evaluated as ◯, and those other than that were evaluated as ×.

Humidity control: The moisture absorption and desorption amount was measured based on the moisture absorption and desorption property prescribed in JIS A6909 (finishing coating material for construction). As a substrate, a coating material composition of Examples / Comparative Examples was applied to a gypsum board having a thickness of 9.5 mm and a size of 300 mm × 300 mm, as in the appearance evaluation, and left in a curing room for 12 days. Four test specimens are coated with an epoxy resin adhesive and allowed to stand for 48 hours in a thermo-hygrostat with a temperature of 23 ± 2 ° C. and a humidity of 45 ± 5%.
In the measurement procedure of the test, the mass of the test specimen is measured in advance, and after standing for 24 hours in a constant temperature and humidity chamber with a temperature of 23 ± 2 ° C. and a humidity of 45 ± 5%, the mass is measured. Then, after standing for 24 hours in a constant temperature and humidity chamber with a temperature of 23 ± 2 ° C. and a humidity of 90 ± 5%, the mass is measured. This cycle was performed for 2 cycles, and the moisture absorption and desorption amount of these specimens was calculated according to the test procedure of the moisture absorption and desorption property specified in JIS A6909. (Values are converted to g / m ² per change on average)
As an evaluation, a case where the moisture absorbing / releasing g / m ² moisture absorbing / releasing amount of 70 or more, which is the standard of the humidity control type of the interior thin coating material and the interior thick coating material, is evaluated as “◯”, and the case where it does not satisfy is “×”.

4 is a photograph of a microscope 50 × substitute for Example 2. FIG. It is a microscope 50 times substitute photograph of Example 6. FIG. It is the microscope 50 times substitute photograph of what applied only the coating material A. FIG. Illustration of zero span

Explanation of symbols

1 Coating material layer 2 Abutting surface 3 Base (gypsum board)
4 Universal testing machine grip

Claims (6)

A water-based coating composition composed of a synthetic resin emulsion, clay, silt, sand, and water, with a moisture absorption / release amount of 70 or more of JISA6909 applied at 2.0 kg / m ² , and the weight excluding volatile matter is 100 The water system is characterized in that the solid content is 6 to 10.14% by weight of the synthetic resin emulsion, 26 to 35% by weight of clay and silt, and 55 to 65% by weight of sand, and cracks occur after coating and drying. Coating material composition.   The aqueous coating material composition according to claim 1, wherein the synthetic resin emulsion is an acrylic resin emulsion.   The water-based coating material composition according to claim 1, comprising: a synthetic resin emulsion-based finishing coating material defined in JIS A6909, and soil for earth wall made of clay and silt, sand, and water.   The water-based coating material composition according to claim 3, wherein the synthetic resin emulsion-based finishing coating material defined in JISA6909 is an acrylic resin-based emulsion.   A wall surface construction method comprising applying the aqueous coating material composition according to any one of claims 1 to 4 after forming a coating film having irregularities with a synthetic resin emulsion type finishing coating material defined in JIS A6909.   A wall structure formed by the wall surface construction method according to claim 5.