JP2018162651A - Coating repair method for building structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To impart durability to an improved coating film and mfake simple and convenience repairs on a caving-like breakage portion, in relating to the coating repair for a jacket material of a building structure.SOLUTION: In a coating repair method, a repair coating film comprises a laminate coating of a multi-layer coating film having a primer treatment layer, a durability treatment layer, and a top coat treatment layer, and fiber reinforcement plastic structure is provided for the primer treatment layer. Resin selected from an unsaturated polyester resin, an epoxy resin or an urethane resin is used as a matrix resin of a fiber reinforcement plastic structure. Glass fiber is used as fiber in the coating repair method.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a coating repair technique for exterior materials for building structures, and more particularly to a method for repairing a building material that has deteriorated to enable long-term use.

  Examples of the exterior material that can be used include roofing materials such as colored iron plates, concrete, cement tiles, fired tiles, and slate. Examples of the outer wall material include ceramics-based, metal-based, wooden-based, mortar, concrete, steel frame, tile, brick, and the like. Examples of the windbreak plate, nasal cover, eave sky, and the like include a color iron plate, a calcium silicate plate, and a flexible board.

  Then, the following patent documents are known as a repair technique of the exterior material by the multilayer coating film of this invention.

Japanese Patent Laid-Open No. 1993-141966 JP 1994-079229 JP 1995-331162 A JP-A-1996-100187 JP 2000-055441 A JP 2000-178758 A JP 2001-191013 A Japanese Patent Application Laid-Open No. 2001-2000641 JP 2001-323212 A JP 2005-036034 A Japanese Patent Laying-Open No. 2005-082681 JP 2005-334759 A JP 2005-350892 A JP 2006-122820 A JP 2008-024823 A JP 2008-223417 A JP 2009-194441 A JP 2010-001492 A JP 2011-094247 A JP 2013-209832 A JP 2014-136199 A JP 2014-140994 A Japanese Patent Application Laid-Open No. 2015-063600 Japanese Patent Laying-Open No. 2015-068096 Japanese Patent Laying-Open No. 2015-124553 JP-A-2015-196726 JP 2006-132742 A Japanese Patent Laid-Open No. 2006-172804 Japanese Patent Laid-Open No. 2006-194045 Japanese Patent Laid-Open No. 2006-199681 JP 2017-2271 A Architectural structural base materials such as painted siding boards and pre-coated steel sheets are provided with functions such as corrosion resistance, weather resistance, contamination resistance and hydrophilicity by laminating a plurality of coating films (Patent Documents 20 and 22). ). As a method of repairing / repairing these building boards, when the damage on the painted surface is minor, it is possible to repair the coating thickness to about 5 to 10 μm by top coating (Patent Document 21).

  On the other hand, as a method for repairing / renovating exterior materials where the coating surface has been damaged, a method of laminating a coating film by applying multiple times such as undercoating, intermediate coating, and top coating is adopted (Patent Document) 13, 16, 20). At the time of such coating repair, the existing coating film is left as long as it is healthy. The paint adhesion with the base material surface such as an existing painted surface becomes important. Therefore, in order to improve the adhesion of the paint and the durability of the base material, an undercoat paint is applied to the surface of the base material, and a base adjustment process is performed.

  When an organic solvent containing toluene or xylene is used as a coating for undercoating, there is a concern about damage to the coating film on the substrate. About this point, the epoxy resin which can be melt | dissolved in a weak solvent is developed also as an object for base-treatment adjustment from the adhesiveness with respect to a base material being favorable (patent document 9).

  About the epoxy resin used as a paint for undercoat, the permeability to the rust layer can be improved and the rust can be fixed by reducing the viscosity of the epoxy resin (Patent Document 29). If the viscosity of the epoxy resin is lowered, paint dripping is likely to occur. A technique for solving this problem by containing an amide amine salt and a silicate is also disclosed (Patent Document 26). Furthermore, the pot life can be extended by employing a solvent having a carbonyl group (Patent Document 23).

  In addition, as an epoxy resin-based primer preparation composition with excellent long-term anticorrosive properties, addition of anticorrosive pigments and corrosive ion-immobilizing materials (Patent Document 29), addition of zinc powder, amide amine salts, and silicates (Patent Documents) 26) and the like. As described above, the use of an epoxy resin is suitable for the base adjustment process.

  In order to improve the durability and fastness of the coating film, it is necessary to further stack the coating layer. Moreover, in order to provide functionality, such as a weather resistance, it overcoats (patent documents 3, 15). Thus, a urethane resin coating containing polycarbonate diol and polyester polyol is also disclosed from the viewpoint of chemical resistance such as wear resistance and ultraviolet absorber (Patent Document 31).

  Moreover, utilization of a polyester resin is also suggested as a primer coating film with an epoxy resin (patent document 6).

  On the other hand, a coating composition having improved adhesion of a urethane resin coating to a metal has also been developed (Patent Document 4). In addition, when urethane resin is used as a surface treatment preparation, it is suggested that weak solvents such as mineral spirit, naphtha, petroleum benzine, etc. can be used as a solvent. (Patent Document 12). In addition, paying attention to the point that the coating thickness can be increased by keeping the amount of isocyanate groups relative to hydroxyl groups within an appropriate range, and pointed out the merit of changing from epoxy resin to urethane resin for repairing concrete base materials. (Patent Documents 17 and 27).

  Next, with regard to exterior materials for building structures, panelized materials such as siding panels are widely used for the purpose of reducing local construction work. Painted paneling with unevenness (Patent Document 7), improvement of press formability of pre-coated steel sheets (Patent Document 2), and the like are also factors in the spread of the panel. Further, a renovation technique for building outer walls using fiber reinforced plastic panels is also disclosed (Patent Document 5).

  In on-site panel construction, when the panel is attached or after attachment, the connecting surfaces are joined with a toned sealing material, etc., and waterproofed. Moreover, the joint structure aiming at coating on a sealing agent is also disclosed (patent document 1).

  Regarding the sealing material, the silicone-based sealing material has a problem in adhesion to the paint. Therefore, when coating the surface of the sealing material, the adhesion of the coating can be improved by using a modified silicone sealing material (Patent Documents 11 and 18). A coating composition having base followability has also been developed as a top coat of a sealing material (Patent Document 28).

  Depending on the plasticizer used to adjust the viscosity of the sealing material, there is a problem that the plasticizer diffuses on the surface of the cured product and further diffuses on the surface of the top coat and contaminates those surfaces. The sealing material itself also loses elasticity. Regarding this point, a method for treating a surface of a sealing material and a protective coating near the surface (Patent Document 4) relates to a top surface coating material of a sealing material using a strong solvent as a plasticizer, and uses neutral silica sol as a coating film for preventing contamination and cracking. A technique is disclosed (Patent Document 14).

  In addition, the sealing part is prone to cracking due to solidification due to aging deterioration of the sealing material, deterioration of adhesion to the base, deformation and distortion of the structure, and relatively large due to intrusion of rainwater from that part. There is a possibility of damage, and the repair method of such a part also becomes a problem. In order to prevent contamination by such a sealing material and improve the service life of the sealing material, a protective coating treatment technique using an unsaturated polyester resin is also disclosed (Patent Document 4).

  Next, the fiber reinforced plastic is manufactured by impregnating the matrix fiber with the reinforced fiber. An example of the reinforcing fiber is a converged glass fiber (Patent Document 10). Examples of the matrix resin include an epoxy resin, a polyurethane resin, and an unsaturated polyester resin (Patent Document 19). It has also been pointed out that the combination of carbon fiber and epoxy resin is excellent in mechanical properties (Patent Document 30).

  As an applied technology, a fiber reinforced resin layer is formed on a polyurea resin putty having high elongation elasticity as a technique for preventing peeling of concrete structures (Patent Document 8) or for repairing and reinforcing steel structures of steel bridges. Repair reinforcement (Patent Document 25) is disclosed. These utilize the high durability of fiber reinforced plastics and are based on the ease of local construction. In addition, regarding repair by these fiber reinforced plastics, it is possible to provide a fiber reinforced plastic layer further by a primer process (patent document 24).

  As described above, the fiber-reinforced plastic technology has been widely used, but no development of use for coating exterior materials of building structures has been attempted.

  Color steel plates and caging boards with excellent processing and construction suitability and strength characteristics are often used as exterior materials for building structures such as houses, buildings, and factories.

  These exterior materials are shipped from the factory and affixed locally. At this time, the coating layer may be damaged by rubbing the uneven surface of the caging material. In addition, the occurrence of cracks and cracks in the coating film due to deterioration over time promotes the penetration of rainwater, etc., and the generation of local corrosion currents accelerates the corrosion of the underlying steel plate, creating corrosion holes, which are connected, As a result, the base material is lost. In addition, joint sealing damage due to expansion and contraction of the base material occurs locally, leading to corrosion damage of the coating layer and the base material.

  If the base steel sheet itself has a wide range of corrosion damage, filling and repair with a sealing agent becomes difficult. In addition, concrete, mortar, calcium silicate plates, etc. are prone to cracks and the like, and the base itself deteriorates at portions where water absorption and drying accompanying rainwater intrusion is repeated, and repair with a sealing material is difficult. In addition, it is necessary to impart strength by painting.

  Therefore, when painting and repairing these exterior wall structures, we provide a painting repair method that improves durability and enables recycling of exterior materials by combining coating technology using multilayer coating and fiber-reinforced plastic technology. The task is to do.

  A repair method of an outer wall material / roof material comprising primer treatment, durability treatment, and top coat treatment, which is partially or entirely a fiber reinforced plastic structure (hereinafter referred to as “FRP structure”). Provide.

  Non-woven fabrics, bundle fibers, powder fibers, or the like can be used as the FRP structure fibers. For extensive repairs, chopped fibers and powdered fibers can be used.

  In the primer treatment, a resin coating selected from a polyester resin, an epoxy resin, and a urethane resin is infiltrated into a rusted or damaged portion into a deteriorated exterior building material to make a resin. It aims at adhesion with the base and adhesion with the top coat, and aims at rust prevention treatment and waterproof treatment of the base material.

  The purpose of coloring and durability treatment is to adjust the color tone and to provide fastness with a predetermined thickness to maintain the rust prevention and waterproofing imparted by the primer treatment, and to reinforce the topcoat layer And The resin is selected from an epoxy resin, a urethane resin, and an acrylic resin.

  The FRP structure can be provided in the primer treatment layer or the durability treatment layer. Preferably, it is provided in the primer treatment layer. This is to improve the adhesion with the base material. When a polyester resin is used as the primer treatment layer, it is preferable to use oil-free, but in other cases, adhesion to the reinforcing colored layer can be achieved by applying a primer treatment to the polyester coating film.

  The top coat is intended to protect the primer treatment layer, the durability treatment layer, the FRP matrix resin, and the sealing material. As the resin, silicon resin, fluororesin, polycarbonate diol and the like can be used as appropriate.

  With the recent progress of painting technology such as ciding panels, the durability of coating films has also improved. Therefore, the occurrence of the overall corrosion of the exterior material is reduced, and when the dirt is removed by high-pressure water washing or the like, the damage is often not enough to require re-covering. However, the exterior material refurbishment and repair method necessitates full rehabilitation in order to achieve the same color tone.

  On the other hand, the service life of base materials such as galvalume steel sheets has been dramatically increased.

  According to the present invention, by combining the laminated coating film and the partial FRP structure, it is possible to repair the corrosion breakage portion and at the same time to match the color tone with the healthy portion of the base material.

As described above, the present invention treats the coating film of the exterior material as a consumable item, and extends the renewal period by simply renewing the coating film and providing the durability of the repair coating film until it is necessary to repair the base material. Is possible.
In addition, it discloses a coating composition that can be used for future technological development of urethane and polyurethane paints, and enables paint repair with urethane and polyurethane from primer treatment to top coat.

Explanatory drawing which showed the repair method by the multilayer coating film of the outer wall panel which uses a color steel plate (Examples 5 and 6).

  As the base material, a color steel plate, various types of scoring boards, flexible boards, calcium silicate boards, precast concrete boards, lightweight cellular concrete boards, cement, mortar, gypsum board boards, aluminum, iron, stainless steel, etc. can be targeted.

  The primer treatment layer is used for the base preparation treatment. An epoxy resin or a urethane resin can be used as the coating resin. When rust has occurred, the viscosity of the epoxy resin can be adjusted with a solvent to improve the permeability to rust.

  As the solvent, an aliphatic hydrocarbon solvent and a high-boiling aromatic hydrocarbon solvent can be used. Specifically, mineral spirit, naphtha, n-butane, n-hexane, n-octane, or the like can be used.

  As a rust preventive pigment that can be added to the epoxy resin and the urethane resin, aluminum phosphate, zinc phosphate, phosphate, molybdate, stearic acid, tannic acid, and the like can be used. In addition, extender pigments, colored pigments, pigment dispersion materials, surface conditioners, anti-sagging, and the like can be added.

  Color pigments such as titanium dioxide, iron oxide, and carbon black, extender pigments such as silica, calcium carbonate, and barium sulfate, zinc phosphate, aluminum phosphate, molybdate, barium metaborate, hydrocalumite, etc. Anti-rust pigments can be used.

  As a sealing material for cracks and breakage points, silicone, modified silicone, polyurethane, and two components can be used as one component, modified silicone, polysulfide, polyurethane, epoxy, urethane, polyurea resin, and silicon. It is necessary to select a sealing material that has low solvent contamination and excellent adhesion to the base material and the sealer and to the FRP matrix resin layer.

  The modified silicone system can be painted and used in the present invention. Polyurethane systems have good paintability, but need to be overcoated due to poor weather resistance. The film thickness of the primer is preferably 1 to 200 μm.

  An epoxy resin, urethane resin, silicon resin, or fluororesin can be used as the coloring / durability treatment layer. The durable layer is provided for the purpose of reinforcing the top coat film such as a primer and a top coat. The film thickness of the durable layer is preferably 1 to 300 μm.

  The top coat layer is intended to impart weather resistance, light resistance, water resistance and stain resistance to the entire coating layer. As the coating resin, acrylic resin, acrylic urethane resin, urethane resin, fluororesin, polyester resin, vinyl ester resin, or the like can be used. About the coating thickness, 0.1 μm to 20 μm is appropriate.

  Examples of the additive for the topcoat paint include an ultraviolet absorber, a light stabilizer, a light-shielding material, a film-forming aid, and a stain-resistant hydrophilic property-imparting material. In addition, a pigment can be mixed with the coating liquid in order to align the color tone of the repaired portion.

  As the light shielding material, calcium carbonate, silica, alumina, magnesium oxide, talc, clay, or the like can be used.

  As a film forming aid, texanol, butyl cellosolve, butyl cellosolve acetate, carbitol, triethylene glycol, or the like can be used.

  Organosilicates, fluorosurfactants, photocatalytic titanium oxides, and the like can be used as hydrophilicity imparting materials for the purpose of contamination resistance.

  As the solvent, aliphatic hydrocarbon compounds such as mineral spirits can be used.

  Next, the FRP structure is provided in the primer-treated layer or the durability-treated layer for the purpose of repairing / reinforcing missing portions that are difficult to treat with a sealing material, and repairing cracks and breakage in cement and mortar exterior materials.

  As the fiber, carbon fiber, nylon short fiber, glass fiber, Zylon fiber, boron fiber, polyethylene fiber, Kepler fiber, and the like can be used. These materials can also be used as a nonwoven fabric.

  As the matrix resin, an unsaturated polyester resin, an epoxy resin, a urethane resin, or the like can be used.

  The method of applying the paint is by brush painting, roller painting, spray painting, dipping or the like.

<Adjustment of test sample>
(Adjustment of base material)
(1) The base material used in the coating adhesion test (cross-cut method, JISK5600-5-6) is a siding panel discarded due to the replacement of the outer wall of a general house, and the degree of coating deterioration is JISK5600. As an evaluation of coating film deterioration specified in -8-5, the part corresponding to the peeling grade 1 in JIS Table 2 was prepared as a base material for testing.
(2) A4 plate clear case (polypropylene sheet) was used as the base material used for the bending resistance test of the coating film.
(Adjustment of primer treatment layer)
Applying 35g / m2 to 45g / m2 of dry weight of unsaturated polyester resin and letting it stand for 4 days, curing at a temperature of 23 ± 2 ° C and a relative humidity of 50 ± 5% for 16-24 hours, primer treatment layer Was adjusted.
(Adjustment of coloring / durability treatment layer)
An epoxy resin added with a color pigment was applied to the primer-treated layer having the above-mentioned adjustment as a resin dry weight of 35 g / m 2 to 45 g / m 2 and left for 4 days, at a temperature of 23 ± 2 ° C. and a relative humidity of 50 ± 5%. The primer treatment layer was adjusted by curing for 16 to 24 hours.
(Adjusting the topcoat treatment layer)
To the colored / durability treated layer having the above-mentioned adjustment, 5 g / m 2 to 45 g / m 2 as a resin dry weight was applied to the fluororesin, and left for 4 days, at a temperature of 23 ± 2 ° C. and a relative humidity of 50 ± 5%, 16 Curing for ˜24 hours was performed to adjust the topcoat treatment layer.

<Coating adhesion test>
The adhesion test of the coating film was evaluated by the cross-cut method defined in JISK5600-5-6: 1999. Regarding the cut interval (JIS 7.1.4), the primer-treated layer was 1 mm apart, and the other coating layers were 2 mm apart. A commercially available cello tape was used as the transparent pressure-sensitive adhesive tape.

Example 1
As glass fiber, 5 g of bundled fiber having a length of 3 mm and a fiber diameter of 9 to 13 μm is blended with 1000 g of unsaturated polyester resin (corresponding to 0.58 mass% with respect to the dry weight of the polyester resin), and the glass fiber is uniformly dispersed. Example 1 was obtained by uniformly mixing 10 g of the curing agent and applying it with a roller. The glass fiber was not compounded as Comparative Example 1.
(Example 2)
Example 2 was the same as Example 1 except that the glass fiber length of Example 1 was 6 mm.
(Example 3)
The test piece of Example 1 was provided with a coloring / durability treatment layer, and Example 3 was obtained. Similarly, a coloring and durability treatment layer was provided on the test piece of Comparative Example 1 to obtain Comparative Example 2.
Example 4
The test piece of Example 2 was provided with a coloring / durability treatment layer, and Example 4 was obtained.
(Example 5)
A top coat layer was provided on the test piece of Example 3 to obtain Example 5. Similarly, a top coat layer was provided on the test piece of Comparative Example 2 to obtain Comparative Example 3.
(Example 6)
A top coat layer was provided on the test piece of Example 4, and Example 6 was obtained.

<Bend resistance test of coating film>
The test piece for the bending resistance test of the coating film was bent and evaluated at an angle at which cracking was observed.
(Example 7)
The same primer treatment as in Example 1 was performed on a test piece for the anti-fading test of the coating film to obtain Example 7. Comparative Example 4 was treated with a primer that did not contain glass fiber as in Comparative Example 1.
(Example 8)
The same primer treatment as in Example 2 was applied to a test piece for the bending resistance test of the coating film to obtain Example 8.

<Evaluation>
(Evaluation method)
(1) About the adhesion test of the coating film, it evaluated by the classification | category of the test result of Table 1 of JISK5600-5-6.
(2) About the bending resistance test, it evaluated by the mandrel diameter of the type 1 prescribed | regulated to JSK5600-5-1.

(Evaluation results)
(1) Coating film adhesion test results (cross-cut method)
About the comparative example 1 which does not mix | blend glass fiber with a primer processing layer, the adhesiveness of a coating film is quantity, and it was classification 0 in the classification | category of JIS5800-5-6 Table 1 test result (the edge of a cut is completely smooth) And there is no peeling in the eyes of any lattice).
Examples 1 and 2 in which glass fibers were blended in the primer-treated layer are also classified as 0, and there is no inhibition of adhesion to the base material due to blending of glass fibers, which is a good result.
(2) Bending resistance test result of coating film (cylindrical mandrel method)

  It can also be used for new construction and recycling. Standardization can be achieved by clarifying the respective characteristics of the multilayer coating film. In addition, the present invention discloses a coating film configuration that can cope with future technological development of urethane and polyurethane paints.

DESCRIPTION OF SYMBOLS 1 Ground steel plate 2 Old coating layer 3 Corrosion-repaired repair layer 4 Primer treatment layer 5 Coloring / durability treatment layer 6 Topcoat layer 7 Fibre-reinforced treatment layer

The present invention relates to a painting repair / repair technique for exterior materials of a building structure, and in particular, to provide a construction method that repairs a building material that has deteriorated and enables long-term use. Is.

Examples of the exterior material that can be used include roofing materials such as colored iron plates, concrete, cement tiles, fired tiles, and slate. Further , examples of the outer wall material include ceramics-based, metal-based, wood-based, mortar, concrete, steel frame, tile, brick, and the like. Further, Hafuban, fascia, for etc. Nokiten can be exemplified a color steel plate, silicate calcium board, and flexible board.

Then, the following patent documents are known about the repair technique of the exterior material by the multilayer coating film which concerns on this invention.

Japanese Patent Laid-Open No. 1993-141966 JP 1994-079229 JP 1995-331162 A JP-A-1996-100187 JP 2000-055441 A JP 2000-178758 A JP 2001-191013 A Japanese Patent Application Laid-Open No. 2001-2000641 JP 2001-323212 A JP 2005-036034 A Japanese Patent Laying-Open No. 2005-082681 JP 2005-334759 A JP 2005-350892 A JP 2006-122820 A JP 2008-024823 A JP 2008-223417 A JP 2009-194441 A JP 2010-001492 A JP 2011-094247 A JP 2013-209832 A JP 2014-136199 A JP 2014-140994 A Japanese Patent Application Laid-Open No. 2015-063600 Japanese Patent Laying-Open No. 2015-068096 Japanese Patent Laying-Open No. 2015-124553 JP-A-2015-196726 JP 2006-132742 A Japanese Patent Laid-Open No. 2006-172804 Japanese Patent Laid-Open No. 2006-194045 Japanese Patent Laid-Open No. 2006-199681 JP 2017-2271 A

Architectural structural base materials such as painted siding boards and pre-coated steel sheets are provided with functions such as corrosion resistance, weather resistance, contamination resistance and hydrophilicity by laminating a plurality of coating films (Patent Documents 20 and 22). ). As a method for repair and renovation painting of building board, if damage to the coated surface is slight, it is also possible repair in 5~10μm about the film thickness by topcoating (Patent Document 21).

On the other hand, as a method for repairing / renovating exterior materials where the coating surface has been damaged, a method of laminating a coating film by applying multiple times such as undercoating, intermediate coating, and top coating is adopted (Patent Document) 13, 16, 20). At the time of such coating repair, the existing coating film is left as long as it is healthy. The paint adhesion with the base material surface such as an existing painted surface becomes important. In order to improve the durability of paint adhesion and substrate, coating a primer coating on the substrate surface, to adjust the processing of the base.

If as a coating material for undercoat using organic solvents including toluene and xylene, damage of the coating of the substrate is concerned. In this regard, an epoxy resin that can be dissolved in a weak solvent has also been developed for use in adjusting the surface treatment since it has good adhesion to a substrate (Patent Document 9).

About the epoxy resin used as a paint for undercoat, the permeability to the rust layer can be improved and the rust can be fixed by reducing the viscosity of the epoxy resin (Patent Document 29). When the viscosity of the epoxy resin is lowered, paint sagging tends to occur. However, a technique for solving this problem by containing an amide amine salt and a silicate is also disclosed (Patent Document 26). Further, by adopting a solvent having a carbonyl group, it is also possible to let extend the pot life (Patent Document 23).

In addition, as an epoxy resin-based primer preparation composition with excellent long-term anticorrosive properties, addition of anticorrosive pigments and corrosive ion-immobilizing materials (Patent Document 29), addition of zinc powder, amide amine salts, and silicates (Patent Documents) 26) and the like. Thus the use of e epoxy resin as a base adjustment process is suitable.

In order to improve the durability and fastness of the coating film, it is necessary to further overlap the coating film layer. Moreover, in order to provide functionality, such as a weather resistance, it overcoats (patent documents 3, 15). Thus, a urethane resin coating containing polycarbonate diol and polyester polyol is also disclosed from the viewpoint of chemical resistance such as wear resistance and ultraviolet absorber (Patent Document 31).

Further, as a primer coating, also the use of port Riesuteru resin epoxy resin together with has been suggested (Patent Document 6).

   On the other hand, a coating composition having improved adhesion of a urethane resin coating to a metal has also been developed (Patent Document 4). In addition, when urethane resin is used as a surface treatment preparation, it is suggested that weak solvents such as mineral spirit, naphtha, petroleum benzine, etc. can be used as a solvent. (Patent Document 12). In addition, paying attention to the point that the coating thickness can be increased by keeping the amount of isocyanate groups relative to hydroxyl groups within an appropriate range, and pointed out the merit of changing from epoxy resin to urethane resin for repairing concrete base materials. (Patent Documents 17 and 27).

   Next, with regard to exterior materials for building structures, panelized materials such as siding panels are widely used for the purpose of reducing local construction work. Painted paneling with unevenness (Patent Document 7), improvement of press formability of pre-coated steel sheets (Patent Document 2), and the like are also factors in the spread of the panel. Further, a renovation technique for building outer walls using fiber reinforced plastic panels is also disclosed (Patent Document 5).

The local panel construction, Saimata of the panel mounting after mounting, were joined by such sealing materials toning the connection surface, it performs waterproofing. Moreover, the joint structure aiming at coating on a sealing agent is also disclosed (patent document 1).

For the sealing material, silicone sealing materials have a problem with adhesion to the paint. Therefore, when coating on the surface of the sealing material , the adhesion of the paint can be improved by using a modified silicone sealing material (Patent Documents 11 and 18). A coating composition having base followability has also been developed as a top coat of a sealing material (Patent Document 28).

Some plasticizer used to adjust the viscosity of the sealing material, the plasticizer diffuses into the surface of the cured product, and further diffuse into the topcoat surface, there is a problem of contaminating their surface, and ceiling material itself The result is a loss of elasticity. In this regard, the processing method of the protective Kotengu sealing material surface and near-surface (Patent Document 4) relates to topcoat surface coating of the sealing material for a strong solvent and a plasticizer, as contamination and cracking inhibition of the coating film, the neutral silica sol Is disclosed (Patent Document 14).

In addition, the sealing part is prone to cracking due to solidification due to aging deterioration of the sealing material, deterioration of adhesion to the base, deformation and distortion of the structure, and relatively large due to intrusion of rainwater from that part. There is a case of damage, and the repair method of such a part also becomes a problem. In order to prevent contamination by such a sealing material and improve the service life of the sealing material, a protective coating treatment technique using an unsaturated polyester resin is also disclosed (Patent Document 4).

On the other hand, fiber reinforced plastics can be produced by impregnating a reinforced fiber with a matrix resin and exemplified by a bundled glass fiber as the reinforced fiber (Patent Document 10). Examples of the matrix resin include an epoxy resin, a polyurethane resin, and an unsaturated polyester resin (Patent Document 19). It has also been pointed out that the combination of carbon fiber and epoxy resin is excellent in mechanical properties (Patent Document 30).

The application technique, spalling prevention of the concrete structure (Patent Document 8), or as a repair reinforcement technology steel structure of the steel bridge, forming a fiber reinforced resin layer on the polyurea resin putty having a high elongation elastic Repair reinforcement (Patent Document 25) is disclosed. These utilize the high durability of fiber reinforced plastics and are based on the ease of local construction . For the repair by fiber reinforced plastic of these, the primer treatment, it is possible to further provide a fiber-reinforced plastic layer (Patent Document 24).

More fiber reinforced plastic technology as is being及Hiroshi, use development to the exterior materials painting of the building structure is not yet is is still attempted.

Residence, building, as the exterior material for building structures such as factories, processing and construction proper, color steel plate and Sai dengue boards have been widely used with excellent strength properties.

These exterior materials are shipped from the factory and affixed locally. At this time, the coating layer may be damaged by rubbing the uneven surface of the caging material. Further, the occurrence of cracks generated in the coating film due to aging promotes the infiltration of rainwater, due the occurrence of localized corrosion current, promotes corrosion of the underlying steel sheet corrosion pitting has occurred, the lower Ri them connected Chizai Results in loss of. Further, joint sealing damage due to expansion and contraction of the base material occurs locally, leading to corrosion damage of the coating layer and the base material.

If the base steel sheet itself has a wide range of corrosion damage, filling and repair with a sealing agent becomes difficult. In addition, concrete, mortar, calcium silicate plates, etc. are prone to cracks and the like, and the base material itself deteriorates at portions where water absorption and drying accompanying rainwater intrusion is repeated, and repair with a sealing material is difficult. In addition, it is necessary to impart strength by painting.

Therefore, when painting repair renovation of the outer wall structure, paint repair method enhances Ri耐 durability due to combining the multi-layer coating film by coating technology and fiber-reinforced plastics technology, and possible recycling of the outer package it is an object to provide a.

The present invention, primer treatment layer 4, the durability treatment layer 5, a method of repairing an outer wall material, roofing material consisting of top coat treatment layer 6, part Tekiwaka properly is entirely fibrous the priming layer 4 The reinforced resin material 7 is blended (hereinafter referred to as “FRP structure”).

The fibrous layer of the FRP structure, nonwoven or the like is used bundled fibers, powdery fibers. In extensive renovation, to use chopped fiber, a powdered fiber.

Primer treatment, degraded exterior building materials in the polyester resin, the resin coating material is selected from epoxy resin or urethane resin, a resin of it to penetrate the rust partial or broken parts. This aims to adhesion between the adhesion and overcoat of a base material, it is an object of the rust-proof treatment and waterproofing of the underlying material.

Coloring and durability treatment, the purpose both when adjusting a color tone, to confer robustness to the coating to maintain the rust-waterproof granted by primer treatment as prescribed thickness, and a reinforcement of the top coat layer It is what. What is used as a resin material is selected from an epoxy resin, a urethane resin material, or an acrylic resin.

FRP structures are preferably kick set the priming layer, which is to enhance the adhesion to the underlying material. When using a polyester resin as a primer-treated layer, it is preferable to use an oil-free, otherwise, reduce the adhesion between the things thus reinforcing the colored layer to the primer treatment on the coating film of the polyester resin It is .

Topcoat, intended to protect priming layer and durability treatment layer or FRP matrix resin, the及beauty shea-ring material. As the resin material, urethane resin, silicon resin, fluororesin, polycarbonate diol, or the like is appropriately used.

Sai dengue panel or the like, along with the recent advances in coating technology, the durability of the coating film is improved, generation of overall corrosion of the outer package is low, the remove the dirt by high pressure water cleaning, often not a damage as to require replacement but, Insect renovation of the outer package in order to align the color tone, it is the overall reconnection is forced.

On the other hand, the service life of the base material such as Galvalume steel plate (registered trademark) has been dramatically increased.

Therefore, according to the present invention, by combining the laminated coating film and the partial FRP structure, it is possible to repair the corrosion breakage portion and at the same time to match the color tone with the healthy portion of the base material.

Thus, the present invention treats the paint film of the exterior material as consumables, to require the renovation of the base material, the extension of the simple simple update and the update period by the durability grant of complement Osamunurimaku of the coating film it is to enable the.

Moreover, the coating film structure which can respond to the technical development of future urethane resin and polyester resin is disclosed, and the paint repair by urethane resin and polyester resin is enabled from primer processing to topcoat.

The expanded sectional view of the multilayer coating film of the outer wall panel in a color steel plate. The expanded sectional view in the multilayer coating film of another outer wall panel.

As the base material, the color steel plate, various rhino dengue boards, flexible boards, calcium silicate board, precast concrete plate, you lightweight concrete plates, cement, mortar, gypsum board plate, the target aluminum, iron steel, stainless steel, etc. .

The priming layer was an object under destination adjusting process, as the paint resin, a polyester resin, using a urethane resin or epoxy resin. If rust is generated, the viscosity of these resins may be adjusted with a solvent to improve the permeability to rust .

As the solvent, an aliphatic hydrocarbon solvent and a high-boiling aromatic hydrocarbon solvent can be used. Specifically, to use mineral spirits, naphtha, n-butane, n- hexane, n- octane and the like.

The anticorrosive pigment you added to the epoxy resin and urethane resin, aluminum phosphate, zinc phosphate, phosphate, molybdate, stearic acid, to use and tannic acid. Other, extender pigments, coloring pigments, pigment dispersing agent, a surface conditioner, added and sagging.

As the pigment to be blended, titanium dioxide emissions, iron oxide, colored pigments such as carbon black, silica, calcium carbonate, extender pigments such as barium sulfate, zinc phosphate, aluminum phosphate, molybdate, barium metaborate, hydrocalumite to use, such as anti-rust pigments such as site.

As a sealing material for cracks and breakage points, silicone, modified silicone, polyurethane, two components, modified silicone, polysulfide, polyurethane, epoxy, urethane, polyurea resin, silicon are used as one component To do . It is necessary to select a sealing material that has low solvent contamination and excellent adhesion to the base material and the sealer and to the FRP matrix resin layer.

Modified silicone is capable of painting, it can be used in the present invention. Urethanes have good paintability, but need to be overcoated due to poor weather resistance. The film thickness of the primer is preferably 1 to 200 μm.

The coloring and durability treatment layer, it is possible to use epoxy resins, urethane resins, silicone resins, fluorine resins. Durable layer is provided for the purpose of reinforcing the top coat such as a primer and topcoat. The film thickness of the durable layer is preferably 1 to 300 μm.

The top coat layer is intended to impart weather resistance, light resistance, water resistance and stain resistance to the entire coating layer. As coating resins, to use acrylic resins, acrylic urethane resins, urethane resins, and etc. fluorine resins. Coating thickness is appropriate 0.1μm~20μm

Examples of the additive for the top coat paint include an ultraviolet absorber, a light stabilizer, a light-shielding material, a film-forming aid, and a stain-resistant hydrophilic property-imparting material. In addition, a pigment can be mixed with the coating liquid in order to align the color tone of the repaired portion.

The light-shielding material, to use calcium carbonate, silica, alumina, magnesium oxide, talc, clay, and the like.

The coalescents, to use texanol, butyl cellosolve, butyl cellosolve acetate, carbitol, triethylene glycol and the like.

The hydrophilicity-imparting material for the purpose of stain, organosilicate, a fluorine-based surfactant, that use such photocatalyst titanium oxide.

The solvent to use an aliphatic hydrocarbon compounds such as mineral spirits.

Next, in the FRP structure, a primer treatment layer or a durability treatment layer is provided for the purpose of repairing / reinforcing missing portions that are difficult to treat with a sealing material, and repairing cracks and breakage of cement and mortar exterior materials.

The fibrous, to use carbon fibers, nylon staple fibers, glass fibers, Zylon fibers, boron fibers, polyethylene fibers, and the like Kepler fiber. These materials can also be used as a nonwoven fabric.

The matrix resin, unsaturated polyester resins, epoxy resins, that use a urethane resin.

   The method of applying the paint is by brush painting, roller painting, spray painting, dipping or the like.

<Adjustment of test sample>
(Adjustment of base material)
(1) The base material used for the coating adhesion test (cross-cut method, JISK5600-5-6) is a siding panel discarded due to the replacement of the outer walls of ordinary houses, and the degree of coating deterioration is JISK5600- As an evaluation of coating film deterioration specified in 8-5, a portion corresponding to the peeling grade 1 in JIS Table 2 was prepared as a base material for testing.
(2) A4 plate clear case (polypropylene sheet) was used as the base material used for the bending resistance test of the coating film.
(Adjustment of primer treatment layer)
The unsaturated polyester resin was allowed to 35g / m2~45g / m2 as the resin dry weight was applied for 4 days, the temperature 23 ± 2 ° C., a relative humidity of 50 ± 5%, performed curing of 16 hours to 24 hours, primed Layer adjustments were made.
(Adjustment of coloring / durability treatment layer)
An epoxy resin added with a color pigment was applied to the primer-treated layer having the above-mentioned adjustment as a resin dry weight of 35 g / m 2 to 45 g / m 2 and left for 4 days, at a temperature of 23 ± 2 ° C. and a relative humidity of 50 ± 5%. Curing for 16 to 24 hours was performed , and the primer treatment layer was adjusted.
(Adjusting the topcoat treatment layer)
To the colored / durability treated layer having the above-mentioned adjustment, 5 g / m 2 to 45 g / m 2 as a resin dry weight was applied to the fluororesin, and left for 4 days, at a temperature of 23 ± 2 ° C. and a relative humidity of 50 ± 5%, 16 It performs a regimen of 24 hours, was carried out to adjust the top coat processing layer.

<Coating adhesion test>
The adhesion test of the coating film was evaluated by the cross-cut method defined in JISK5600-5-6: 1999. Regarding the cut interval (JIS 7.1.4), the primer-treated layer was 1 mm apart, and the other coating layers were 2 mm apart. A commercially available cellophane tape was used as the transparent pressure-sensitive adhesive tape.

The structural aspects of the materials described below as Examples 1 to 7 refer to those described in “Table 1” and are not illustrated in FIGS. 1 and 2.

Example 1
As the glass fiber, length 3 mm, the focusing fiber 5g of fiber diameter 9～13Myuemu, incorporated into the unsaturated polyester resin 1000 g (polyester resin dry weight relative equivalent to 0.58 wt%), and uniformly dispersed glass fiber Then, 10 g of the curing agent was uniformly mixed and applied with a roller to obtain Example 1. Moreover, the thing which does not mix | blend glass fiber was made into the comparative example 1.
(Example 2)
Addition to the glass fiber length of Example 1 and 6 mm is the same as the actual Example 1 was as in Example 2.
(Example 3)
The test piece of Example 1 was provided with a coloring / durability treatment layer, and Example 3 was obtained. Similarly, a coloring and durability treatment layer was provided on the test piece of Comparative Example 1 to obtain Comparative Example 2.
Example 4
The test piece of Example 2 was provided with a coloring / durability treatment layer, and Example 4 was obtained.
(Example 5)
A top coat layer was provided on the test piece of Example 3 to obtain Example 5. Similarly, a top coat layer was provided on the test piece of Comparative Example 2 to obtain Comparative Example 3.
(Example 6)
A top coat layer was provided on the test piece of Example 4, and Example 6 was obtained.

<Bend resistance test of coating film>
The test piece for the bending resistance test of the coating film was bent and evaluated at an angle at which cracking was observed.
(Example 7)
The same primer treatment as in Example 1 was performed on a test piece for the anti-fading test of the coating film to obtain Example 7. Comparative Example 4 was treated with a primer that did not contain glass fiber as in Comparative Example 1.
(Example 8)
A test piece for bending resistance test of the coating film subjected to the same primer treatment as in Example 2 was as in Example 8.

<Evaluation>
(Evaluation method)
(1) About the adhesion test of the coating film, it evaluated by the classification | category of the test result of Table 1 of JISK5600-5-6.
(2) About the bending resistance test, it evaluated by the mandrel diameter of the type 1 prescribed | regulated to JSK5600-5-1.

(Evaluation results)
(1) Coating film adhesion test results (cross-cut method)
About the comparative example 1 which does not mix | blend glass fiber with a primer processing layer, the adhesiveness of a coating film is quantity, and it was classification 0 in the classification | category of JIS5800-5-6 Table 1 test result (the edge of a cut is completely smooth) And there is no peeling in the eyes of any lattice).
Examples 1 and 2 in which glass fibers were blended in the primer-treated layer are also classified as 0, and there is no inhibition of adhesion to the base material due to blending of glass fibers, which is a good result.
(2) Bending resistance test result of coating film (cylindrical mandrel method)

It can also be used for new construction and recycling. Standardization can be achieved by clarifying the respective characteristics of the multilayer coating film. In addition, the present invention discloses a coating film structure that can cope with future technological development of urethane and polyurethane paints.

1 Exterior material (underlying steel material)
2 Old paint layer 3 Corrosion-repaired treatment layer 4 Primer treatment layer 5 Coloring / durability treatment layer 6 Topcoat layer 7 Fibre-reinforced treatment layer

Claims (3)

  This is a repair / repair method for exterior coatings in building structures. The repair coating is composed of a multilayer coating consisting of a primer-treated layer, a durability-treated layer, and a topcoat-treated layer, and the primer-treated layer is reinforced with fibers. A painting repair method characterized by providing a plastic structure.   2. The multilayer coating according to claim 1, wherein a resin selected from unsaturated polyester resin, epoxy resin or urethane resin is used as a matrix resin of a fiber reinforced plastic structure, and glass fiber is used as a fiber. Painting repair method with film.   2. The coating repair method using a multilayer coating film according to claim 1, wherein an unsaturated polyester resin is used as a matrix resin of a fiber reinforced plastic structure, and a glass bundling fiber is used as a fiber.