JPS61126261A - Finishing of outer wall of building - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for finishing the outer surface of an outer wall of a building, and more specifically, a method for finishing the outer surface of an outer wall of a building, which is waterproof and has good moisture permeability. The present invention relates to a method using a coating composition.

BACKGROUND ART Conventionally, porcelain tiles, light metals such as aluminum, metals such as colored folded plates and steel plates, various architectural paints, etc. have been used to finish the outer surface of the outer walls of buildings.

However, the finishing materials for the exterior walls of these buildings are materials that have a waterproof function but have almost no water vapor permeability.
Or, it is a material with almost no waterproofing or vapor permeability.

If the exterior finishing material for the exterior wall of a building does not have a waterproof function, rainwater and the like will infiltrate the exterior wall frame of the building, causing problems such as water leakage, rotting of the frame material, and reduced strength. In addition, if the exterior finishing material for the exterior wall of a building does not have vapor permeability, water vapor generated inside the building cannot be discharged from the exterior wall, causing condensation within the building frame.
This causes problems such as rotting, generation of stress, reduction in strength, and reduction in insulation performance, and when the outer surface finishing material is paint, it causes blistering and peeling of the paint film itself.

The present invention aims to provide the exterior wall of a building with waterproofness and water vapor permeability, which have not functioned satisfactorily with the conventional building exterior wall finishing methods as described above. As 2. Qn? A method of using a coating composition having an hmHg/g or less on the outer surface of an outer wall of a building,
It eliminates various harmful effects caused by internal dew condensation on the outer wall of a building, and at the same time improves the durability of the coating composition itself.

As a composition, a thermoplastic or thermosetting resin film, or a film made of the above resin mixed with various fillers, pigments, etc., is formed by mechanical or chemical methods into a film that is smaller than a water molecule and larger than a water vapor molecule. Holes have been formed, thermoplastic or thermosetting resins mixed with various fillers that are non-water absorbing and have good water vapor permeability, and chemical methods that have low water vapor diffusion resistance and are water-plastic. A plastic or thermosetting resin film, or a paint that has similar properties to the above resin film after coating, with a water permeation rate of Q, 5n+N or less per 24 hours, and a moisture permeation resistance of 2.0rrrha+Hg. /g or less, and methods for applying such a coating composition to the outer surface of a building's outer wall include a partial adhesion method using an adhesive or real-melt resin, and a method for applying a coating composition to the outer surface of a building's exterior wall using a mesh-like or porous plate material. There are methods of adhering to the outer surface of the exterior wall, methods of painting with a roller, spraying, etc., and methods of adhering or fixing a plate-shaped material coated or laminated with the above film composition to the outer surface of the exterior wall of the building. .

By using the method according to the present invention as a finishing method for the outer surface of a building's outer wall, it is possible to prevent rainwater from entering from the outer surface of the building's outer wall and prevent internal dew condensation within the building frame. ′ Generally, the water vapor pressure inside a building is higher than that of the outside air, and this pressure difference causes water vapor to move within the building frame from the indoor side to the outside air side. The presence of certain materials will prevent water vapor movement on the indoor side of materials with high moisture permeation resistance, resulting in internal condensation due to condensation of water vapor, mold growth due to internal condensation, and a decline in the insulation performance of the insulation material. This may cause the structure to deteriorate or deteriorate in strength. In addition, if the exterior wall surface finishing material with high moisture permeability resistance is a coating composition such as paint, blistering and peeling of the coating composition may occur, and in cold regions, freezing damage may occur. By using this, it is possible to prevent the above-mentioned problems caused by internal condensation and problems caused by the coating itself.

As mentioned above, internal condensation on the exterior wall of a building will flow into the interface from the indoor side when the moisture permeability resistance of the outside air side material is greater than the moisture permeability resistance of the indoor side material in the joining frame materials. The amount of water vapor that flows out to the outside air from the interface is smaller than the amount of water vapor that flows out to the outside air from the interface, so if the amount of water vapor transferred throughout the entire structure is large, the water vapor condenses at the interface, so the finish of the outer surface of the building's outer wall The moisture permeation resistance of the coating composition used for this must be lower than the moisture permeation resistance of the underlying material, that is, the material that will become the exterior wall surface material before the coating composition is applied to the outer surface of the building's exterior wall.

Table 1 shows the moisture permeability resistance values of base materials that can be used in the finishing method for the exterior walls of buildings according to the present invention. Must be less than 0rrfhwHg/g. Note that this moisture permeation resistance value is also proven by Examples described later.

Table 1 Water permeability shall be Q, 5 mIt or less by a test method according to JIS A 6910. Originally, there is no water permeability. However, if the amount of water permeation exceeds 0.5 mj2, the intruding water moves inside the structure and accumulates, so it cannot be said that the structure has waterproof properties. Therefore, the coating composition used for finishing the outer surface of a building exterior wall according to the present invention has a water permeation rate of 0.5 ml or less per 24 hours and a moisture permeation resistance of 2.
h Must be less than Hg/g.

Next, comparative experimental methods and results conducted based on the present invention will be shown as examples.

Comparative experimental method〉 As shown in Figure 1, the specimen 5 prepared by the test specimen preparation method described later was installed on the boundary wall of the constant temperature and humidity chambers of room A and room B, whose temperature and humidity can be adjusted. The temperature and humidity of room B were changed and the wind speed on the surface of the specimen was adjusted using the fan 6, and the moisture content distribution and temperature distribution of the specimen were measured. Further, the amount of water permeation was measured by a water permeation funnel test according to JISA 6910, and the moisture permeation resistance was measured according to ASTM-E96 Sea 1 Moisture Permeability Test Method for Fire Materials.

The test coating compositions and their physical properties are shown in Table 2.
Table 3 shows the room setting conditions.

Table 2 Table 3 0 Sample Preparation Method As shown in Figure 2, 3 out of 5 fi
00 cm x height 300 Make a mortar board 1 of chu, stack 10 of them, superimpose polystyrene foam 2 of the same size as the mortar board on one side, and make the surrounding area with a thickness of 200
Adhesively seal with μ aluminum tape 3. On this occasion,
A T-type treatment couple is embedded between the mortars and at the contact interface between the mortar and the polystyrene foam so that no gaps are created.

The mortar side surface 4 of the substrate prepared as described above was spray-painted with test materials (al acrylic rubber elastic paint, (b) sand wall-like sprayed wood, test materials (C) polyethylene sheet and (dll). A sample (Boretex fabric manufactured by Boa, Inc., USA) was dot-bonded to obtain a specimen 5.

0 Results of Comparison Experiments As shown in Figure 1, each specimen was installed on the boundary wall between chambers A and B with the test material facing chamber B.
The temperature, humidity and wind speed were set as in step 3, the temperature change between each layer was measured, and 24 hours after reaching a steady state, the specimen was removed, the aluminum chip 13 was peeled off, and the mortar plate MN was measured. The weight water content was measured by comparing the weight before the start of the test and the bone dry weight. The coating and film surface conditions were also observed. The moisture content, temperature distribution, etc. under each condition are shown in FIGS. 3 and 4. Number in the diagram
(a-d) respectively indicate the material numbers in Table 2, and although the temperature distribution during steady state shows almost the same change, the moisture content obviously differs depending on the moisture permeation resistance of the material. Sand wall-shaped sprayed materials (b) and Goretesox fd), which have a moisture permeability resistance of 2.0 mhmHg/g or less, have a high moisture content on the A room side (high temperature side) even if the B room temperature is 0°C or 5°C. The B room side shows a low moisture content, indicating that water vapor from the A room side is being discharged to the B room side.

According to the above experiment, the moisture permeability resistance was 2. QmhmmHg/g
or less, and the water permeability is 0.5mj? It has been found that if the following coating composition is applied to the outer surface of the outer wall of a building, adverse effects such as internal dew condensation can be prevented.

4. Brief explanation of the figures Figure 1 is a cross-sectional view of the main parts of an experimental apparatus for testing the superiority of the finishing method for the outer surface of a building exterior wall based on the present invention, and Figure 2 is a cross-sectional view of the main part of the experimental equipment used for the experiment. FIGS. 3 and 4 are graphs showing the experimental results of moisture content and temperature for each distance from the interface of chambers A and B.

1----Mortar board, 2-...-Polystyrene foam.

3--aluminum tape, 4-mortar plate surface.

5...Specimen, 6-...Fan.

No. IIl￥1 No. 2 Fig. 31m Bt&I U1 Mi, ', bQjo Toy I No. 4 Bi 　+D, bU''”fo @ ) (Procedural amendment (voluntary) April F date, 1985 1. Indication of the incident 1982 Patent Application No. 92679 2
, Title of the invention Finishing method for the outer surface of a building's outer wall 3, Relationship with the case of the person making the amendment Patent applicant address 3-5 Meieki, Nakamura-ku, Nagoya-shi, Aichi Prefecture, "Name of the invention" in the specification to be amended column, "Detailed Description of the Invention" column 6, contents of the amendment as shown in the attached sheet (other than the matters stated in the column subject to amendment, the contents are Specification 1, name of the invention, method of finishing the outer surface of a building's outer wall 2, Claims: As a finishing method for the outer surface of the outer wall of buildings such as reinforced concrete construction, steel frame concrete construction, reinforced steel frame concrete construction, PC board construction, ALC board construction, cotton cement board construction, wooden construction, block construction, inorganic siding board construction, etc. , water permeability is 0.51111 or less per 24 hours, and moisture permeation resistance is 2.0 m”t.
1. A method for finishing the outer surface of an outer wall of a building, characterized by using a coating composition having vaHg/g or less.

3. Detailed Description of the Invention The present invention relates to a finishing method for the outer surface of a building's outer wall. More specifically, the present invention relates to a finishing method for the outer surface of a building's outer wall. The present invention relates to methods of using certain coating compositions.

BACKGROUND ART Conventionally, porcelain tiles, light metal layers such as aluminum, metals such as colored folded plates and steel plates, various architectural paints, etc. have been used as finishing methods for the outer surfaces of building exterior walls.

However, the finishing materials for the exterior walls of these buildings are materials that have a waterproof function but have almost no water vapor permeability.
Or, it is a material that has almost no waterproof function or vapor permeability.

If the finishing material for the outer surface of a building's outer wall does not have a waterproof function, rainwater and the like will infiltrate the building's outer wall frame, causing problems such as water leakage, rotting of the frame material, and reduced strength. In addition, if the finishing material for the outer surface of a building's exterior wall does not have vapor permeability, water vapor generated inside the building cannot be discharged from the exterior wall, causing condensation within the building frame.
This may cause problems such as rot, mold growth, reduced strength, and reduced insulation performance, and if the finishing material on the outer surface is paint, it may cause blistering or peeling of the paint film itself.

The present invention aims to provide the exterior wall of a building with waterproofness and water vapor permeability, which have not functioned satisfactorily with the conventional finishing methods for exterior walls of buildings as described above. This is a method in which a coating composition with a moisture permeability resistance of 2.0 m" hssHg/g or less is used on the outer surface of a building's outer wall, and it eliminates various adverse effects caused by internal condensation of the building's outer wall frame. , which improves the durability of the coating composition itself.

In order to achieve the above objects, the coating composition used in the method of finishing the outer surface of a building exterior wall according to the present invention is a thermoplastic or thermosetting resin film, or the above resin is combined with various fillers, pigments, etc. A thermoplastic or thermosetting resin that is non-water-absorbent and has good water vapor permeability. Thermoplastic or thermosetting resin films that have been mixed with various fillers, have low water vapor diffusion resistance and are hydrophobic by chemical methods, or have properties similar to the above resin films after forming a coating film. This kind of paint has a water permeation rate of 0.5+nJ per 24 hours! The moisture permeability resistance is 2.0 m'hffisHg/g or less, and methods for applying such a coating composition to the outer surface of a building's outer wall include a partial adhesion method using an adhesive or hot melt resin, and a mesh-like method. Alternatively, a porous plate material may be brought into close contact with the outer surface of a building's outer wall, a coating method such as brushing, roller, spraying, etc., or a plate material coated or laminated with the above coating composition may be applied to the outer surface of a building's outer wall. There are methods such as adhesion or fixation.

By using the method according to the present invention as a finishing method for the outer surface of a building's outer wall, it is possible to prevent rainwater from entering from the outer surface of the building's outer wall and prevent internal dew condensation within the building frame.

Generally, the water vapor pressure inside a building is higher than the outside air, and this pressure difference causes water vapor to move within the building's framework from the indoor side to the outside air, but there is a large resistance to moisture permeation on the outer surface of the exterior wall. The presence of such materials prevents water vapor movement on the indoor side of materials with high moisture permeation resistance, resulting in internal condensation due to condensation of water vapor, mold growth due to internal condensation, and the insulation performance of the insulation material. This results in deterioration, rotting of the structure, and loss of strength. Furthermore, if the exterior wall surface finishing material with high moisture permeation resistance is a coating composition such as paint, the coating composition may blister or peel, and in cold regions, the coating may deteriorate or flake due to frost damage. By the way, by using the method for finishing the outer surface of a building exterior wall according to the present invention, it is possible to prevent the above-mentioned problems caused by internal dew condensation and problems with the coating itself.

As mentioned in Moe's article, internal condensation on the exterior wall of a building will flow into the interface from the indoor side when the moisture permeability resistance of the outside air side material is greater than the moisture permeability resistance of the indoor side material in the joining frame materials. The amount of water vapor that flows out to the outside air from the interface is smaller than the amount of water vapor that flows out to the outside air from the interface, so if the amount of water vapor transferred throughout the entire structure is large, the water vapor condenses at the interface, so the finish of the outer surface of the building's outer wall The moisture permeability resistance of the coating composition used for this must be lower than that of the underlying material, that is, the material that will serve as the exterior wall surface material upon which the coating composition is applied to the outer surface of the building's exterior wall.

Table 1 shows the moisture permeability resistance value of the base material that can be used for the finishing method of the exterior wall of a building based on the present invention.The moisture permeable resistance of the material used in the finishing method based on the present invention is 2.0 m ``It must be thrown below hmmHg/g.

Note that this moisture permeation resistance value is also proven by Examples described later.

'Table-1 Water permeability shall be 0.5+nJj or less by a test method based on JIS A 6910. Originally, water permeability is 0
However, the coating composition used according to the present invention has good water vapor permeability, and even if some rainwater enters the interior, it will be discharged as water vapor again. It is not necessary that the water permeability is Oli. However, if the amount of water permeation exceeds 0.5 ni, the intruding water moves inside the structure and accumulates, so it cannot be said that the structure has waterproof properties.

Therefore, the coating composition used for finishing the outer surface of the outer wall of a building according to the present invention has a water permeability of 0.5 m per 24 hours.
The moisture permeability resistance must be 2.0m2mmHg/g or less.

Next, comparative experimental methods and results conducted based on the present invention will be shown as examples.

Comparative experimental method〉 As shown in Figure 1, the specimen 5 prepared by the test specimen preparation method described later was installed on the boundary wall of the constant temperature and humidity chambers of room A and room B, whose temperature and humidity can be adjusted. The temperature and humidity of room B were changed and the wind speed on the surface of the specimen was adjusted using the fan 6, and the moisture content distribution and temperature distribution of the specimen were measured. The amount of water permeation was measured by a water permeation funnel test according to JtSA 6910, and the moisture permeation resistance was measured according to the ASTM-E96 moisture permeability test method for sheet materials.

The test coating compositions and their physical properties are shown in Table 2.
Table 3 shows the room setting conditions.

Table-2 Table-3 0 Sample Preparation Method As shown in Figure 2, 10 mortar plates with good surface precision, 5 mm thick x 300 mm wide x 300 m + e, were prepared, and 10 of them were stacked one on top of the other. A polystyrene foam 2 having the same dimensions as the mortar plate is placed on top of the other, and the periphery is adhesively sealed with an aluminum tape 3 having a thickness of 200 μm.

At this time, T-type electrocouples are embedded in the contact interfaces between the mortars and between the mortar and the polystyrene foam so that no gaps are created.

The mortar side surface 4 of the base body prepared as above was spray-coated with test material (a) acrylic rubber elastic paint, (b) sand wall-like spray material, test material (c) polyethylene sheet, and (d) test material. Boretex (fabric manufactured by Boa, Inc., USA) was dot-bonded to provide specimen 5.

OResults of Comparison ExperimentsAs shown in Figure 1, each specimen was installed on the boundary wall between chambers A and B with the test material facing chamber B.
Set the temperature, humidity, and wind speed as in 3, measure the temperature change between each layer, and remove the specimen 24 hours after reaching a steady state.
Yay 7. The weight was measured, and the weight moisture content was determined by comparing it with the weight before the start of the test and the bone dry weight.The coating and film surface conditions were also observed.The moisture content, temperature distribution, etc. under each condition were It is shown in Fig. 4.

The numbers (a-d) in the figure indicate the material numbers in Table 2, and the temperature distribution during steady state shows almost the same changes, but the moisture content clearly differs depending on the moisture permeability resistance of the material. . The sand wall-like sprayed material (b) and Boretex (d), which have a moisture permeability resistance of 2.0 s" hsmHg/g or less, have a low moisture content on the A room side (high temperature side) even if the B room temperature is 0°C or 5°C. is high, but the moisture content on the B room side is low, indicating that water vapor from the A room side is discharged to the B room side.

According to the above experiment, the moisture permeability resistance was 2.0m"hm+nHg
/g or less and the amount of water permeation is 0.511+R or less, it is found that if a coating composition is applied to the outer surface of the outer wall of a building, adverse effects such as internal dew condensation can be prevented.

4. Brief explanation of the figures Figure 1 is a cross-sectional view of the main parts of an experimental apparatus for testing the superiority of the finishing method for the outer surface of a building exterior wall based on the present invention, and Figure 2 is a cross-sectional view of the main part of the experimental equipment used for the experiment. FIGS. 3 and 4 are graphs showing the experimental results of moisture content and temperature for each distance from the interface between chambers A and B.

l・・・・・・Mortar board.

2・・・・・・・・・Polystyrene foam.

3・・・・・・・・・Aluminum tape.

4. Mortar board surface.

5......Specimen.

6...Fan.

Patent Applicant Kikusui Chemical Co., Ltd. Dingzoku II Seisho 2 () 7 Type) Showa 6 (2012) 127] / Soup day ""nVcM 'f"R Road 5' ゛Mushi 1, g display Showa 59 Patent Application No. 92679 2, Title of the Invention Method for Finishing the External Surface of Building External Walls 3, Relationship with the Amendment Person Case Patent Applicant No. 14-16 Toyo Building (Delivery Date December 10, 1985) 5 , Target of amendment Column 6 of "Person making the amendment" of the procedural amendment submitted dated April 27, 1985, Contents of the amendment Procedural amendment (voluntary) April 27, 1985

Claims (1)

[Claims] As a finishing method for the exterior walls of buildings such as reinforced concrete, steel frame concrete, reinforced steel concrete, PC board, ALC board, asbestos cement board, wooden, block, and inorganic siding board, water permeation rate is 24 hours. Less than 0.5ml per bottle, and moisture permeability resistance is 2.0m^2hm
A method for an exterior wall of a building, characterized by using a coating composition that has a concentration of mHg/g or less.