JP2016204981A - Outer wall repair method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an outer wall coating method, being high in adhesiveness with a building wall surface, for keeping a fine dressing state over a long period, dispensing with maintenance and capable of long useful life.SOLUTION: When coating a finish coating material (6) by coating primer paint (5) by polishing a coating surface (2) of a building outer wall (1), the finish coating material includes an A liquid and a B liquid, and [A liquid] (1) a fluororesin of including a copolymer of fluoro olefin and alkyl vinyl ether, (2) at least one substance selected from a silane-based compound of including a silanol group by a hydrolysis of an alkoxy group, photocatalytic titanium oxide, alkali silicate-based inorganic coating material and a metallic alkoxide-based inorganic material as a hydrophilicity imparting agent, (3) an ultraviolet ray absorber and (4) a solvent, and [B liquid] (1) a hardening agent and (2) a solvent, and the A liquid and the B liquid are mixed and coated by a roller.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a method for repairing an outer wall having high adhesion to a building wall surface, maintaining a beautiful appearance for a long time, requiring no long-term maintenance, and having high durability.

  Surfaces such as wall surfaces of buildings are constructed by attaching natural stones, thin metal plates, tiles, etc., applying artificial natural stone patterns, spraying, etc. from the viewpoint of aesthetics and protection of the main body. . Conventionally, as a method of applying a pattern or the like to the surface of a wall surface or the like of a building, for example, there is a method of applying a lysine-based (compound containing aggregate) and a paint-based material by a trowel coating method, a roller coating method, or the like. is there. The trowel coating method is a method in which a material is transferred to the surface of a building using a trowel and extended. The roller coating method is a method in which a material is transferred to the surface of a building using a roller or a trowel and extended by the roller. Since these are performed manually, a large pattern can be applied, but they are not suitable for thick coating or large area coating.

  For this reason, the method of coating by using a compressed air and spraying a spraying material from a spray gun etc. is proposed (patent document 1). In this spray coating method, appropriately pulverized natural stones are mixed in a synthetic resin, and multiple types of mixed materials of different colors are prepared in separate tanks in a single spray gun. The mixed material is sprayed simultaneously from separate spray ports of a multi-head spray gun having a plurality of spray ports, and is applied in an unmixed multicolored state. As a non-staining finish on the painted surface, the present inventors have described a coating method that can be used for 40 years or longer by using a topcoat material containing a siloxane-crosslinked acrylic-silicon polymer or a fluororesin. Etc.

Japanese Patent Publication No. 5-9587 JP 2009-264011 A Japanese Patent No. 5478700

  However, even if the conventional technique is applied as it is to repairing an already constructed building outer wall, it has been difficult to obtain an outer wall having a long service life.

  In order to solve the above-described conventional problems, the present invention provides an outer wall coating method that has high adhesion to a building wall surface, maintains a beautiful appearance for a long time, requires no maintenance, and has a long service life.

The outer wall repair method of the present invention is a repair method of an outer wall of a building, wherein the painted surface of the outer wall of the building is polished, a primer paint is applied to the formed polished surface, and a top coat material is applied to the primer paint coated surface. When using the outer coating of the outer wall of the building, the top coating material contains the following liquid A and liquid B,
[Liquid A]
(1) Fluororesin containing a copolymer of fluoroolefin and alkyl vinyl ether (2) As a hydrophilicity-imparting agent, a silane compound containing a silanol group by hydrolysis of an alkoxyl group, a photocatalytic titanium oxide, an alkali silicate inorganic coating material, At least one substance selected from metal alkoxide-based inorganic materials (3) UV absorber (4) Solvent [Liquid B]
(1) Curing agent (2) Solvent The A liquid and the B liquid are mixed to form a top coating material, and roller coating is performed.

  The present invention comprises polishing the painted surface of the outer wall of the building, applying a primer paint to the formed polished surface, and applying the top coat to the primer paint painted surface using an overcoat material. By coating the topcoat material containing the material with a roller, it is possible to provide an outer wall coating method that has high adhesion to a building wall surface, maintains a beautiful appearance for a long time, requires no maintenance, and has a longer service life. More specifically, the outer wall can be used for 50 years or more than 50 years. Further, since the liquid A and the liquid B are mixed immediately before the coating, not only the storage stability is good, but also the room temperature curability after the coating is good, and the film can be formed with a long-term durability.

FIG. 1 is a schematic explanatory view showing a method of polishing a painted surface of a building outer wall using a brush according to an embodiment of the present invention. FIG. 2 is a schematic explanatory view showing a method of applying a primer coating material on a painted surface.

  In the outer wall repair method of the present invention, first, the painted surface of the building outer wall is polished. The outer wall surface of the building to be repaired is not only dirty, but if the outer wall surface is coated with a fluororesin, the fluororesin may remain. If the fluororesin remains, even if the top coat material of the present invention is applied to this surface, it is difficult to perform strong coating. Therefore, the polishing is necessary for removing the remaining top coating material as well as removing the dirt on the outer wall surface of the building. Furthermore, it is necessary for obtaining an anchor effect and strengthening adhesion by roughening by polishing.

  Next, a primer paint is applied to the polished surface. As a result, the adhesion between the building wall surface and the top coating material is increased, and the durability of the top coating material is also increased. Finally, the primer coating is applied to the outer surface of the building using a top coat. The primer paint is preferably transparent. This is because the colors and patterns of the base coating are used as they are.

The primer paint that can be used is, for example, an acrylic silicon resin having a siloxane cross-link in the molecule. Commercially available products include Tope Corp., trade name “Toa GT Silicon”, and Kansai Paint Co., Ltd. having trade name “Cera M Silicon II” having siloxane and urethane crosslinks in the molecule. The use amount is preferably 0.02 to 0.05 kg / m ² by dry weight, more preferably 0.03 to 0.04 kg / m ² .

The topcoat material of the present invention contains the following A liquid and B liquid,
[Liquid A]
(1) Fluororesin containing a copolymer of fluoroolefin and alkyl vinyl ether (2) As a hydrophilicity-imparting agent, a silane compound containing a silanol group by hydrolysis of an alkoxyl group, a photocatalytic titanium oxide, an alkali silicate inorganic coating material, At least one substance selected from metal alkoxide-based inorganic materials (3) UV absorber (4) Solvent [Liquid B]
(1) Curing agent (2) Solvent The A liquid and the B liquid are mixed to form a top coat material, and roller coating is performed. The mixing ratio of the A liquid and the B liquid is preferably A liquid: B liquid = 70 to 95:30 to 5, more preferably A liquid: B liquid = 75 to 90:10 to 25, particularly preferably. Is A liquid: B liquid = 80-85: 20-15.

The fluoroolefin of the fluororesin (A) component is preferably selected from tetrafluoroethylene and chlorotrifluoroethylene, but can also be used in combination. The copolymerization ratio of the fluororesin is preferably 30 to 70 mol%. The alkyl vinyl ether monomer is preferably a hydroxyl group-containing long-chain alkyl vinyl ether represented by CH ₂ = CRO (CH ₂ ) _n OH (R is H or CH ₃ , n is an integer of 7 to 18). The copolymerization ratio of the alkyl vinyl ether monomer is preferably 5 to 50 mol%. In addition to the two components, a copolymerizable vinyl monomer may be copolymerized. Furthermore, it contains a curing agent (D) having a functional group that reacts with a hydroxyl group, and (A) component is 50 to 95% by weight, and (D) component is 5 to 5% with respect to the total of component (A) and component (D). It is preferable to contain in the ratio of 50 weight%.

  The (D) component curing agent is added to keep the strength and durability of the coating film high. This curing agent is preferably a room temperature curing type such as polyvalent isocyanates. As the polyvalent isocyanate, non-yellowing diisocyanates such as hexamethylene diisocyanate and isophorone diisocyanate and adducts thereof are particularly useful. When normal temperature curing is performed using isocyanates, curing can be accelerated by adding a curing catalyst such as dibutyltin dilaurate. (D) It can harden at normal temperature (about 0-40 degreeC) with the hardening | curing agent of component.

  The hydrophilicity-imparting agent of component (B) imparts hydrophilicity to the top coat (topcoat) film, and is washed away with water such as rain to mix the components so as to always maintain a beautiful appearance. This hydrophilicity imparting agent uses at least one substance selected from a silane compound containing a silanol group obtained by hydrolysis of an alkoxyl group, a photocatalytic titanium oxide, an alkali silicate inorganic coating material, and a metal alkoxide inorganic material. Of these, it is more preferable to use a silane compound containing a silanol group obtained by hydrolysis of an alkoxyl group. As the silane compound, a silane compound having a functional group selected from an average of two or more alkoxysilyl groups, silanol groups and acyloxysilyl groups in one molecule is suitably employed. Such silane compounds are commercially available under names such as silane coupling agents, silane curing agents, silicone curing agents, alkoxysilanes, and silane alkoxides. The hydrophilicity-imparting agent is preferably added in an amount of 5 to 50 parts by weight based on 100 parts by weight of the total amount of the component (A) and the component (D).

  Component (C), an ultraviolet absorber, is added to absorb ultraviolet rays and prevent photodegradation of the coating. As an example, there is a benzotriazole-based compound (BASF (formerly Ciba Geigy), trade name “Tinuvin 900”). A light stabilizer (manufactured by the company, trade name “TINUVIN 144”) and / or a surface conditioner (manufactured by BYK Chemie, trade name “BYK300”) can also be used in combination with the ultraviolet absorber. The ultraviolet absorber is preferably added in an amount of 0.1 to 5 parts by weight based on 100 parts by weight of the total amount of the component (A) and the component (D).

  The solvent of component (E) is added to adjust the viscosity of the top coat and facilitate roller coating. Solvents are toluene, xylene, pentane, hexane, heptane, nonane, cyclohexane, Solvesso # 100 (manufactured by Exxon), Solvesso # 150 (manufactured by Exxon), Swazol # 1000 (manufactured by Maruzen Petrochemical Co., Ltd.), Swazol # 1500 (Maruzen) Petrochemical), Swazol # 1800 (Maruzen Petrochemical), methanol, ethanol, propanol, butanol, isobutanol, ethylene glycol, propylene glycol, diethylene glycol, dipropylene glycol, diacetone alcohol, methyl cellosolve, cellosolve, butyl cellosolve , Cellosolve acetate, ethyl acetate, butyl acetate, isobutyl acetate, benzene, methyl ethyl ketone, methyl isobutyl ketone, isophorone, cyclohexanone, Ethylbenzene, 1,3,5-trimethylbenzene, and the like high boiling aromatic naphtha. These solvents may be appropriately mixed and used. The solvent is preferably added in an amount of 30 to 200 parts by weight based on 100 parts by weight of the total amount of the components (A) and (D).

  The top coating material is commercially available from Toupe under the trade name “New Garmet DC # 500”. This paint is used for roller coating. The advantage of roller coating is that even if there are irregularities on the outer wall surface, it can be applied with a uniform film thickness, there is no coating unevenness, no air bubbles are included, and the coating efficiency is high. It is especially effective for the outer wall by spray painting. After coating, it is cured at room temperature (about 0 to 40 ° C).

  The means for polishing the painted surface of the building outer wall is preferably polishing with a brush and / or sand paper. Polishing with a brush and / or sand paper can efficiently remove the dirt on the outer wall surface of the building and remove the damaged top coat from the remaining recesses. As the brush, a metal brush, a synthetic fiber brush, a natural brush used for scouring, or the like can be used. The metal brush is preferably a brush with a thin wire diameter. The brush may be attached to a rotating brush device for brushing. The sand paper is preferably # 300 to # 500, more preferably # 350 to # 450. It is preferable to handle the sand paper. Sandpaper may be applied after brushing.

  The outer wall of the present invention is preferably a natural stone-like wall surface including a base material layer coated with a non-mixed multicolored coating material containing aggregate and synthetic resin, which may include inorganic powder. In general, there are many tile outer walls in buildings, but the tile outer walls have a problem of easy peeling of tiles due to the large difference in thermal expansion between tiles (ceramics) and concrete, every 10 to 15 years Maintenance repair was necessary. In contrast, natural stone-like wall surfaces do not have such problems, and long-term maintenance-free can be achieved if the problem of surface contamination can be solved.

  In this invention, the coating material which contains an aggregate and a synthetic resin and may contain inorganic powder is used. In the above, the aggregate is a natural stone, a baked aggregate obtained by adding a pigment to natural stone, ceramic, bricks, ceramics, steel slag, etc., and sieved to an average particle size of about 0.1 to 5 mm. It refers to arranged particles. Synthetic resins are resins having high light resistance such as acrylic emulsion paints and urethane paints, which become matrix resins when applied to a painted surface. In the present invention, since the synthetic resin is used for the matrix resin, the painted surface is not destroyed even when subjected to vibration such as an earthquake. For this reason, compared with tiles, bricks, natural stones, etc., the risk of falling during an earthquake is extremely low. The inorganic powder is a mineral powder existing in nature such as silica, talc and clay, and is prepared by sieving into finer average particles than the aggregate. Other thickeners, pH adjusters, antifoaming agents, film-forming aids, water and / or solvents may be added to the coating material.

  The coating material that contains aggregate, synthetic resin, water and / or solvent, and may contain inorganic powder, is made into a non-mixed multicolored form on the building wall or the panel that becomes the wall using a multi-head spray gun. Apply. The multi-head spray gun uses, for example, a coating gun disclosed in Patent Document 1 or Japanese Patent Publication No. 6-61494. This multi-head spray gun can apply a multicolor coating material as a bullet with compressed air separately from different tanks, and the painted surface is applied in a non-mixed multicolored form to form a natural stone tone. Since the surface of the painted surface includes an uneven portion, at least a part of the convex portion (projecting portion) is formed into a flat shape by polishing or grinding. The polished or ground surface is preferably 5 to 50% of the whole. If it does in this way, it will become a so-called burner finish surface of natural stone. Burner finish is a surface of natural stone such as marble or granite that is watered and heated with a flame burner, causing the surface of the stone to suddenly expand and crush, resulting in a rough surface with a rough surface. Is the method.

  In the present invention, the top coat material is preferably applied twice. As a result, the top coating material (top coat) can be applied evenly, and maintenance-free can be achieved for a long time. Further, it is preferable that the top coating material is further coated with a solvent to adjust the viscosity to 35 to 55 centipoise (23 ° C., BL type, rotation speed 60 rpm). As a result, coating can be performed with a uniform film thickness, and the coating efficiency is improved.

The coating amount of the top coating material is preferably in the range of 50 to 200 g / m ² and more preferably in the range of 80 to 150 g / m ² in terms of the solid content after drying. Thereby, long-term maintenance-free can be achieved.

  Hereinafter, it demonstrates using drawing. In the drawings, the same symbols indicate the same items. FIG. 1 is a schematic explanatory view showing a method of polishing a painted surface of a building outer wall using a brush according to an embodiment of the present invention. The surface of the repair wall having the coating layer 2 and the joint 3 on the surface of the base material 1 such as concrete or building panel is first polished with the brush 4. You may grind with a sandpaper after brushing. After polishing, air pressure (high pressure air) is blown to remove abrasive powder. As a result, it is possible to remove dirt on the outer wall surface of the building and remove the remaining damaged topcoat material, and roughen the anchor effect. Repair any damage in the paint layer 2 and joint 3. Note that the cleaning by removing the abrasive powder and the like by blowing compressed air (high-pressure air) has the advantage of not requiring a drying time as compared with cleaning using water. In field work that requires scaffolding, shortening work time is important.

  Next, as shown in FIG. 2, the primer coating is applied with a roller and dried to form a primer coating layer 5. Next, the top coat material is applied to form the top coat layer 6. 7 is a roller coating tool.

  Hereinafter, the present invention will be described more specifically with reference to examples. In addition, this invention is not limited to the following Example.

(Measurement test method for each characteristic)
(1) Accelerated weather resistance test with sunshine weather meter
(a) Testing machine: Model number “WE-SUN-HC-DC” manufactured by Suga Test Instruments Co., Ltd.
(b) Light source: 1 lamp type, cerium-filled cored carbon combined with 4 each
(c) Light wavelength: 280-400 nm
(d) Irradiance: 255 ± 45 W / m ² with filter, 285 ± 50 W / m ² without filter
(e) Optical filter: Heat-resistant optical glass plate used. 1 set of 8 cuts short wavelength components of 255 nm or less, 3 (f) 10-50% transmission of components up to 55 nm
(g) Emission power: 50V, 60A (3000W)
(h) Atmospheric temperature: 63 ± 3 ° C
(i) Shower: Driving for 18 minutes during 120 minutes
(j) Spray water amount: 2100 ± 100 ml / min (pH 6.0 to 8.0, water temperature 16 ± 5 ° C.)
(k) Number of samples: 70 × 150 mm, 76
(l) Operation cycle: 60 hours
(2) Gloss was observed visually and evaluated as follows.
A: Gloss similar to natural stone B: Slightly noticeable gloss (3) Presence or absence of cracks The surface of the sample after the accelerated test using a sunshine weather meter was visually observed and evaluated as follows.
A: No crack B: Slightly cracked, repair required C: Large crack, repair required (4) Discoloration The surface of the sample after the accelerated test with a sunshine weather meter was visually observed and evaluated as follows.
A: No discoloration B: Discoloration but inconspicuous to the extent that there is no practical problem, no repair needed C: Some noticeable discoloration, repair required D: Clearly discolored, repair required

Example 1
As a building wall, the following treatment was applied to a natural stone wall (corresponding to 50 years after construction) sprayed and coated with an unmixed multicolor coating material containing aggregate and synthetic resin and containing inorganic powder. .
(1) First, the painted surface of the building outer wall was polished using sandpaper # 400. After polishing, it was cleaned by blowing high-pressure air. As a result, it was possible to remove the dirt on the outer wall surface of the building, and to remove and roughen the remaining top coating material.
(2) Primer paint was applied to the polished surface.
The primer paint is a commercial product of acrylic silicon resin having siloxane crosslinks, manufactured by Tope Co., Ltd., trade name “Toa GT Silicone”, and 0.13 kg / m ² (solution having a solid content of 33.0%) by a roller. Was applied uniformly.
(3) Top coating After the primer coating film was dried, the top coating was performed twice on the surface of the primer coating using a roller coating tool. The first overcoating was cured at room temperature (25 ° C.) for 24 hours. The top coat material is a product name “New Garmet DC # 500” manufactured by Toupe Co., Ltd., and A liquid and B liquid are mixed at a weight ratio of A liquid: B liquid = 83: 17. 15 parts by weight of a mixed solvent of 24 parts by weight of ethylbenzene, 5 parts by weight of 1,3,5-trimethylbenzene, 38 parts by weight of toluene, 24 parts by weight of xylene, and 9 parts by weight of high-boiling aromatic naphtha are added to a total of 50 parts by weight. It was adjusted to centipoise (23 ° C., BL type, rotation speed 60 rpm), and the coating amount of the top coating material was 100 g / m ^{2 in} terms of solid content after drying. The obtained coated product was confirmed to be durable and free from cracking up to 10,000 hours (corresponding to 50 years) in an accelerated test using a sunshine weather meter. The results are summarized in Table 1. Moreover, the ultraviolet-ray transmission test cuts the ultraviolet rays of 320-380 nm 99%, and the transmission part was 1%.

(Example 2)
An experiment was conducted in the same manner as in Example 1 except that the top coating material was applied once. The obtained coated product was confirmed to be durable with no cracks or cracks until 9000 hours (equivalent to 45 years) in an accelerated test using a sunshine weather meter. The results are summarized in Table 1. Moreover, the ultraviolet-ray transmission test cuts 69.8% of 320-380 nm ultraviolet rays, and the transmission part was 30.2%. In addition, a general top coat material cuts 30 to 41% of ultraviolet rays of 320 to 380 nm, and the transmission part is 70 to 59%.

(Comparative Example 1)
The experiment was performed in the same manner as in Example 1 except that the wall surface of the building was polished with sandpaper and washed with water. It was well dried after washing with water. The obtained coated material was cracked in 6000 hours (corresponding to 30 years) in an accelerated test with a sunshine weather meter, and the gloss was also lowered.

(Comparative Example 2)
The experiment was performed in the same manner as in Example 1 except that no primer paint was used. The obtained coated material cracked in 6000 hours (equivalent to 30 years) in an accelerated test using a sunshine weather meter.

  As is apparent from Table 1, it was confirmed that the outer wall surfaces of Examples 1 and 2 of the present invention had high durability, good outer wall gloss, no cracks, and no discoloration. In addition, it had a calm aesthetic of natural stone (white granite). On the other hand, the durability of Comparative Examples 1 and 2 was low.

  The present invention is suitable for outer walls of general buildings, buildings, condominiums, factories, offices, and the like. Particularly, large-scale repair work every 10 to 15 years that is normally performed in an apartment house (apartment) can be greatly extended, and the repair management cost can be greatly reduced.

DESCRIPTION OF SYMBOLS 1 Base material 2 Paint layer 3 Joint 4 Brush 5 Primer paint layer 6 Top coat layer 7 Roller paint

Claims (7)

A method for repairing an outer wall of a building,
When the painted surface of the building outer wall is polished, the primer coating is applied to the formed polished surface, and the top coating material is applied to the primer coating surface using the top coating material, the top coating material is: Liquid and B liquid,
[Liquid A]
(1) Fluororesin containing a copolymer of fluoroolefin and alkyl vinyl ether (2) As a hydrophilicity-imparting agent, a silane compound containing a silanol group by hydrolysis of an alkoxyl group, a photocatalytic titanium oxide, an alkali silicate inorganic coating material, At least one substance selected from metal alkoxide-based inorganic materials (3) UV absorber (4) Solvent [Liquid B]
(1) Curing agent (2) Solvent A method for repairing an outer wall, characterized in that the liquid A and the liquid B are mixed to form a top coating material and roller coating is performed.   The method for repairing an outer wall according to claim 1, wherein the means for polishing the painted surface of the building outer wall is polishing with a brush and / or sandpaper.   The outer wall repair method according to claim 1, wherein the primer paint is transparent.   The outer wall repair method according to claim 1, wherein the top coat material is applied twice.   The outer wall repairing method according to any one of claims 1 to 4, wherein a solvent is further added to the top coating material to adjust the viscosity to 35 to 55 centipoise (23 ° C, BL type, rotation speed: 60 rpm). The method for repairing an outer wall according to any one of claims 1 to 5, wherein a coating amount of the top coating material is in a range of 50 to 200 g / m ² in terms of a solid content after drying.   The outer wall according to any one of claims 1 to 6, wherein the building wall surface is a natural stone-like wall surface that includes an aggregate and a synthetic resin and is spray-coated with a coating material that may include an inorganic powder in an unmixed multicolored manner. Repair method.

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