JP7312564B2 - How to recycle exterior materials - Google Patents

Description

The present invention relates to a method for recycling an exterior material.

Conventionally, as a technique for regenerating soiled and deteriorated tiles, which are tiles attached via mortar to an outer wall body that constitutes the outer wall of an existing building, a technique has been proposed in which the surfaces and joints of the tiles are repaired while the tiles are attached to the outer wall body, and then the joints and surfaces of the tiles are subjected to surface treatment (see, for example, Patent Document 1).

JP-A-02-183051

Here, in recent years, there is an increasing need to reuse tiles removed from an outer wall for other outer walls. However, as described above, the above-described prior art merely performs repair treatment and surface treatment on tiles. For example, if mortar adheres to the back surface of a tile, it may not be possible to attach the tile to an exterior wall main body that constitutes another exterior wall.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for recycling an exterior material, which makes it possible to improve the reusability of the exterior material.

In order to solve the above-described problems and achieve the object, the exterior material regeneration method according to claim 1 is a regeneration method for regenerating an exterior material attached via mortar to a skeleton main body that constitutes a skeleton of a building, comprising: a removal step of removing the exterior material from the skeleton main body; a discoloration prevention step of performing a discoloration prevention treatment for preventing discoloration of the exterior material; a removing step of removing the mortar adhering to the exterior material by immersing the exterior material removed from the building body in an acidic immersion liquid;The discoloration prevention treatment includes mixing a discoloration prevention agent into the immersion liquid to prevent discoloration of the exterior material, and the discoloration prevention agent includes aluminum chloride or magnesium chloride.

The method for regenerating an exterior material according to claim 2 is the method for regenerating an exterior material according to claim 1, wherein in the discoloration prevention step, when the aluminum chloride is dissolved in the immersion liquid, the solute amount of the aluminum chloride is set to an amount equivalent to 90% to 100% of the saturated solution amount, or when the magnesium chloride is dissolved in the immersion liquid, the solute amount of the magnesium chloride is set to an amount equivalent to 25% to 100% of the saturated solution amount.

A recycling method for an exterior material according to claim 3 is a regeneration method for regenerating an exterior material that is attached via mortar to a frame body that constitutes a skeleton of a building, comprising a removal step of removing the exterior material from the frame body, a discoloration prevention step of performing a discoloration prevention treatment to prevent discoloration of the exterior material, and simultaneously or after the discoloration prevention step, acidifying the exterior material removed from the skeleton body in the removal step. a removal step of removing the mortar adhering to the exterior material by immersing the exterior material in an immersion liquid of No., wherein the discoloration prevention treatment includes a treatment of covering a surface of the exterior material opposite to the surface to which the mortar adheres with a cover material, and simultaneously or after the removal process, a peeling step of peeling the cover material from the exterior material, wherein the cover material isrubber sprayis.

According to the method for regenerating the exterior material according to claim 1, the exterior material is removed from the building frame main body, the discoloration prevention process is performed, and simultaneously with or after the discoloration prevention process, the exterior material removed from the building body in the removal process is immersed in an acidic immersion liquid to remove the mortar adhering to the exterior material. When used for a skeleton, the exterior material can be reliably attached to the skeleton main body of the skeleton. In addition, the discoloration prevention step can prevent discoloration of the exterior material that occurs when the exterior material is immersed in the immersion liquid, and the design of the exterior material can be maintained. As described above, the reusability of the exterior material can be enhanced.
In addition, since the discoloration prevention treatment includes a treatment of mixing a discoloration prevention agent into the immersion liquid to prevent discoloration of the exterior material, discoloration of the exterior material can be prevented simply by mixing the discoloration prevention agent into the immersion liquid, and the discoloration prevention treatment can be easily performed.
Further, since the anti-tarnishing agent contains aluminum chloride or magnesium chloride, it is possible to prevent discoloration of the exterior material compared to other materials, and to effectively perform anti-tarnishing treatment.

According to the method for regenerating the exterior material according to claim 2, in the discoloration prevention step, when aluminum chloride is dissolved in the immersion liquid, the amount of dissolved aluminum chloride is set to an amount corresponding to 90% to 100% of the amount of the saturated solution, or when magnesium chloride is dissolved in the immersion liquid, the amount of dissolved magnesium chloride is set to an amount equivalent to 25% to 100% of the amount of the saturated solution. becomes.

According to the method for regenerating the exterior material according to claim 3, the exterior material is removed from the building body, the discoloration prevention process is performed, and the exterior material removed from the building body in the removal process is immersed in an acidic immersion liquid at the same time as or after the discoloration prevention process, thereby removing the mortar adhering to the exterior material. When used for a skeleton, the exterior material can be reliably attached to the skeleton main body of the skeleton. In addition, the discoloration prevention step can prevent discoloration of the exterior material that occurs when the exterior material is immersed in the immersion liquid, and the design of the exterior material can be maintained. As described above, the reusability of the exterior material can be enhanced.
In addition, the discoloration prevention treatment includes the treatment of covering the surface of the exterior material opposite to the surface to which the mortar adheres with the cover material. Therefore, the discoloration of the exterior material can be prevented simply by covering the opposite surface of the exterior material with the cover material, making it possible to perform the discoloration prevention treatment easily.
In addition, since a peeling step of peeling the cover material from the exterior material is included at the same time as or after the removal process, the cover material can be peeled from the exterior material, and unnecessary cover material can be removed when the exterior material is reused.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram conceptually showing a skeleton according to Embodiment 1, where (a) is a front view and (b) is a cross-sectional view taken along the line AA of (a). FIG. 2B is a diagram showing a removing step of the reproducing method according to Embodiment 1, and a diagram showing a region corresponding to FIG. 2B. FIG. 4 shows a removal step of the regeneration method; It is a figure which shows the test result of a 1st discoloration confirmation test. FIG. 10 is a diagram showing a removal step of the regeneration method according to Embodiment 2; It is a figure which shows the test result of a 2nd discoloration confirmation test. It is a figure which shows the test result of a 1st usability confirmation test. It is a figure which shows the test result of a 2nd usability confirmation test.

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a method for recycling an exterior material according to the present invention will be described in detail below with reference to the accompanying drawings. First, [I] the basic concept of the embodiment will be explained, then [II] the specific contents of the embodiment will be explained, and finally [III] modifications of the embodiment will be explained. However, the present invention is not limited by the embodiment.

[I] Basic concept of the embodiment First, the basic concept of the embodiment will be described. Embodiments generally relate to a regenerating method for regenerating an exterior material attached via mortar to a frame main body that constitutes a frame of a building. Here, the specific structure and type of "building" is arbitrary, and for example, the concept includes detached houses, collective housing such as apartments and condominiums, office buildings, commercial facilities, etc. However, in the embodiment, an office building that is being demolished will be described. Further, the "framework of a building" is, for example, the basic structure of a building, and is a concept including walls, ceilings, floors, pillars, beams, etc., but will be explained as walls in the embodiments. In addition, "exterior material" is a member for decorating the outside of a building, and for example, it is a concept including tile-based exterior materials, brick-based exterior materials, etc., but in the embodiment, it will be described as a tile-based exterior material. Also, "regenerate" means returning the exterior materials removed from the building frame to a state in which they can be used as exterior materials to be attached to the building body of another building.

[II] Specific contents of the embodiment Next, specific contents of the embodiment will be described.

[Embodiment 1]
First, a method for recycling an exterior material according to Embodiment 1 will be described. Embodiment 1 is a form in which the discoloration prevention treatment described later is a treatment of mixing a discoloration prevention agent described later into the immersion liquid described later.

(composition)
First, the structure of the skeleton including the exterior material to which the recycling method according to Embodiment 1 is applied will be described. 1A and 1B are diagrams conceptually showing a frame according to Embodiment 1, in which FIG. 1A is a front view and FIG. In the following description, the X direction in FIG. 1 is the left-right direction of the skeleton (-X direction is the left direction of the skeleton, +X direction is the right direction of the skeleton), the Y direction in FIG. A skeleton 1 is a wall (for example, an outer wall, etc.) that constitutes a building (for example, an office building, etc.), and includes a skeleton main body 10, an exterior material 20, and a base material 30, as shown in FIG.

(Construction - frame body)
The skeleton body 10 is the basic structure of the skeleton 1 . The frame main body 10 is formed of a long rectangular plate-like body made of concrete (for example, made of reinforced concrete or prestressed concrete), and as shown in FIG.

(Construction - Exterior material)
The exterior material 20 is configured using, for example, a known tile-based exterior material or the like, and as shown in FIG.

(Configuration - Exterior material - Exterior material main body)
The exterior material main body 21 is the basic structure of the exterior material 20 . This exterior material main body 21 is configured using, for example, a known tile material (for example, a rectangular tile material having a tile portion and a joint portion) or the like, and as shown in FIG.

As for the specific configuration of the exterior material body 21, in Embodiment 1, as shown in FIG. 1, the entire outer surface of the exterior material body 21 (in FIG. 1B, the entire front surface) is flat. However, it is not limited to this, and may be formed in a non-flat shape, for example. In addition, the entire inner surface of the exterior material main body 21 (in FIG. 1B, the entire rear surface) is formed in a non-flat shape, and specifically, it is formed to have a plurality of convex portions projecting rearward.

(Construction - exterior material - surface film)
The surface film 22 is a film coated with glaze. Here, the term “glaze” means a chemical used to enhance the decorativeness and strength of the exterior material 20 and to prevent staining of the exterior material 20. Specifically, it includes an RO ₂ component (e.g., SiO ₂ component, etc.) that forms the skeleton of the glaze, an R ₂ O ₃ component (e.g., Al ₂ O ₃ component, etc.) that forms a part of the glaze skeleton and connects with the exterior material body 21, and an RO that partially breaks the glaze skeleton and lowers the melting temperature. It is a chemical consisting of components (CaO component, MgO component) and R ₂ O components (Na ₂ O component, K ₂ O component, etc.). In addition, the specific type of "glaze" is arbitrary, but for example, "transparent glaze" that is amorphous, "matte glaze / devitrified glaze" that contains fine crystals that are not incorporated into amorphous, "crystalline glaze" that contains large crystals, and "milky white glaze" that has multiple amorphous phases.

As shown in FIG. 1B, the surface film 22 is provided on the entire outer surface of the exterior material body 21. Specifically, for example, it is formed by applying glaze for exterior tile material to the entire outer surface of the exterior material body 21 and baking it. Here, the amount of glaze to be applied is arbitrary, but for example, it is desirable to set it as small as possible from the viewpoint of forming a uniform surface film 22, but since it may differ depending on the type of glaze and the type of the exterior material main body 21, as an example, it may be set based on experimental results, analysis results, etc.

(Composition - base material)
The base material 30 is for attaching the exterior material 20 to the building body 10 . This base material 30 is configured using, for example, a known mortar base material, and as shown in FIG. The "backing material 30" corresponds to "mortar" in the claims.

(Reproduction method)
Next, a method for recycling the exterior material 20 according to Embodiment 1 will be described. FIG. 2 is a diagram showing the removing process of the reproducing method according to Embodiment 1, and is a diagram showing a region corresponding to FIG. 2(b). FIG. 3 is a diagram showing the removal step of the regeneration method. As shown in FIGS. 2 and 3, the method for recycling the exterior material 20 according to Embodiment 1 includes a removal process, a discoloration prevention process, and a removal process.

(Reproduction method - removal process)
First, the removal process will be described. The removal step is a step of removing the exterior material 20 from the skeleton body 10 .

Specifically, first, a part of the exterior material 20 is cut together with the base material 30 using a known cutting tool (not shown). In this case, the method of cutting the exterior material 20 is arbitrary, but for example, in order to improve the reusability of the exterior material 20, it is desirable to cut the exterior material 20 so that at least one tile portion of the exterior material main body 21 is included in the cutting area of the exterior material 20, and to cut the joint portion of the exterior material main body 21 without cutting the tile portion of the exterior material main body 21. Next, as shown in FIG. 2, the cut exterior material 20 and base material 30 are peeled off from the skeleton body 10 using a known peeling tool (not shown). By repeating these operation cycles a plurality of times, the entire exterior material 20 is removed from the skeleton body 10 .

(Reproduction method - Discoloration prevention step)
Next, the discoloration prevention step will be described. The discoloration prevention process is a process of performing a treatment for preventing discoloration of the exterior material 20 (hereinafter referred to as "discoloration prevention treatment") after the removal process (or before the removal process). Here, “discoloration of the exterior material 20” means that the surface film 22 of the exterior material 20 is discolored when the exterior material 20 is immersed in the immersion liquid used in the removal process described later (specifically, the surface film 22 is discolored to white).

Further, the following is presumed to be the cause of the discoloration of the exterior material 20 . That is, the surface film 22 of the exterior material 20 has acid resistance when various components (RO ₂ component, R ₂ O ₃ component, and RO and R ₂ O components) forming the framework of the glaze are blended in a well-balanced manner and fired. However, with regard to the surface film formed using pre-modern formulation and firing techniques (hereinafter referred to as "old surface film"), some components of the glaze (e.g., Al component, Ca component, etc.) may remain unreacted during baking. As a result, when the exterior material 20 including the old surface film is immersed in the immersion liquid described later, the remaining components are eluted from the old surface film, and a part of the old surface film (specifically, the surface layer of the old surface film) is made porous. Therefore, when the immersed old surface film is exposed to light, the porous part of the old surface film diffusely reflects light, causing the old surface film to appear white (that is, discoloration of the exterior material 20 occurs. ).

Further, although the specific content of the discoloration prevention treatment is arbitrary, in Embodiment 1, a treatment is performed in which a discoloration prevention agent is mixed into an acidic immersion liquid (hereinafter referred to as "immersion liquid"). Specifically, first, the container 50 in FIG. 3 (for example, the container 50 having acid resistance, the exterior material 20 and the base material 30 removed in the removal step, and the container 50 that can accommodate the immersion liquid) is immersed. 1 mol / L of hydrochloric acid is introduced. Next, a predetermined amount of a discoloration inhibitor is added to the container 50 to dissolve the discoloration inhibitor in the immersion liquid (the immersion liquid 40 in FIG. 3 in which the discoloration inhibitor is dissolved is hereinafter referred to as "the immersion liquid 40 containing the discoloration inhibitor"). Here, the "anti-discoloration agent" is for preventing discoloration of the exterior material 20. Specifically, according to the results of the first test described later, aluminum chloride, calcium chloride, magnesium chloride, or the like corresponds. Such discoloration prevention treatment can prevent discoloration of the exterior material 20 simply by mixing the discoloration prevention agent into the immersion liquid, and the discoloration prevention treatment can be easily performed. In particular, since the anti-discoloration agent contains any one of aluminum chloride, calcium chloride, and magnesium chloride, discoloration of the exterior material 20 can be prevented compared to other materials, and discoloration prevention treatment can be effectively performed.

The solute amount of the anti-discoloration agent is arbitrary, but in Embodiment 1, it is set for each type of anti-discoloration agent based on the results of the first test described later. Specifically, the solute amount of aluminum chloride is set to an amount corresponding to 90% to 100% of the saturated solution amount (the solute amount when the discoloration inhibitor is dissolved in the immersion liquid up to the solubility). Also, the solute amount of calcium chloride is set to an amount corresponding to 25% to 90% of the saturated solution amount. Also, the solute amount of magnesium chloride is set to an amount corresponding to 25% to 100% of the amount of the saturated solution. With such a setting, discoloration of the exterior material 20 can be prevented more effectively than other solute amounts, and discoloration prevention treatment can be performed effectively.

(Regeneration method-removal step)
Next, the removing process will be described. The removing step is a step of removing the base material 30 (mortar) adhering to the exterior material 20 by immersing the exterior material 20 removed from the skeleton body 10 in the removal process in the immersion liquid 40 containing the anti-tarnishing agent at the same time as or after the discoloration prevention process.

Specifically, as shown in FIG. 3, first, the exterior material 20 and the base material 30 removed in the removal process are put into the container 50 containing the immersion liquid 40 containing the anti-discoloration agent in the discoloration prevention process. Next, the charged exterior material 20 and base material 30 are immersed in the immersion liquid 40 containing the anti-tarnishing agent for a predetermined time (for example, several hours). Subsequently, after the immersed exterior material 20 and the base material 30 are removed from the container 50, the base material 30 is sprayed with washing water, or the base material 30 is peeled off with an instrument such as a brush or by hand. The base material 30 is removed.

With the above regeneration method, the mortar adhering to the exterior material 20 can be removed by the removal process, and when the exterior material 20 is used for the skeleton 1 of another building, the exterior material 20 can be reliably attached to the skeleton main body 10 of the skeleton 1. In addition, the discoloration prevention step can prevent discoloration of the exterior material 20 that occurs when the exterior material 20 is immersed in the immersion liquid, and the design of the exterior material 20 can be maintained. As described above, the reusability of the exterior material 20 can be enhanced.

(First test result)
Next, the results of the first test conducted by the applicant will be described. Here, the first discoloration confirmation test for various anti-discoloration agents will be described.

(Results of the first test-Overview of the test)
First, an outline of the first discoloration confirmation test will be described. Here, the "first discoloration confirmation test" is a test for various anti-discoloration agents, when the specimen is immersed in an immersion liquid containing various anti-discoloration agents.

Although the test method of this first discoloration confirmation test is arbitrary, it is as follows. That is, first, using a known color difference meter, color measurements are performed on specimens corresponding to various immersion liquids. Next, the corresponding specimens are placed in respective containers containing various immersion liquids and immersed for 14 days (however, the specimen corresponding to the first immersion liquid C is immersed for 6 days). After that, the specimens corresponding to various immersion liquids are visually observed whether or not discoloration has occurred (hereinafter referred to as "visual observation"). Furthermore, after performing the above-described color measurement again on the specimens corresponding to various immersion liquids, the color difference ΔE is calculated based on the color measurement before and after immersion using a known method.

Here, the specimen used in the first discoloration confirmation test was a tile material removed from a dismantled wall and having a surface film made of glaze. Specifically, tile materials attached at different positions on the dismantled wall are used as specimens for each type of immersion liquid.

Further, the immersion liquids used in the first discoloration confirmation test are classified into the first immersion liquid to the fifth immersion liquid. Among them, the first immersion liquid is prepared by dissolving aluminum chloride, which is a discoloration inhibitor, in 1 mol/L of hydrochloric acid. Specifically, the first immersion liquid A is an immersion liquid set to an amount corresponding to the solute amount of aluminum chloride=0% of the saturated solution amount. The first immersion liquid B is an immersion liquid whose amount is set to correspond to the solute amount of aluminum chloride=25% of the saturated solution amount. The first immersion liquid C is an immersion liquid set to an amount corresponding to the solute amount of aluminum chloride=50% of the saturated solution amount. The first immersion liquid D is an immersion liquid set in an amount corresponding to 90% of the solute amount of aluminum chloride=the amount of the saturated solution. The first immersion liquid E is an immersion liquid set in an amount corresponding to 100% of the solute amount of aluminum chloride=100% of the saturated solution amount. The second immersion liquid is obtained by dissolving calcium chloride, which is a discoloration inhibitor, in 1 mol/L of hydrochloric acid. Specifically, the second immersion liquid A is an immersion liquid set to an amount corresponding to the solute amount of calcium chloride=25% of the saturated solution amount. The second immersion liquid B is an immersion liquid whose amount is set to correspond to the solute amount of calcium chloride=50% of the saturated solution amount. The second immersion liquid C is an immersion liquid set to an amount corresponding to 100% of the solute amount of calcium chloride=the amount of the saturated solution. The third immersion liquid is obtained by dissolving magnesium chloride, which is a discoloration inhibitor, in 1 mol/L of hydrochloric acid. Specifically, the third immersion liquid A is an immersion liquid set to an amount corresponding to the solute amount of magnesium chloride=25% of the saturated solution amount. The third immersion liquid B is an immersion liquid set to an amount corresponding to the solute amount of magnesium chloride=50% of the saturated solution amount. The third immersion liquid C is an immersion liquid set to an amount corresponding to 100% of the solute amount of magnesium chloride=100% of the saturated solution amount. The fourth immersion liquid is obtained by dissolving sodium chloride, which is a discoloration inhibitor, in 1 mol/L of hydrochloric acid. Specifically, the fourth immersion liquid A is an immersion liquid set to an amount corresponding to the solute amount of sodium chloride=25% of the saturated solution amount. The fourth immersion liquid B is an immersion liquid set to an amount corresponding to 50% of the solute amount of sodium chloride=the amount of the saturated solution. The fourth immersion liquid C is an immersion liquid set to an amount corresponding to 100% of the solute amount of sodium chloride=100% of the saturated solution amount. The fifth immersion liquid is obtained by dissolving potassium chloride, which is a discoloration inhibitor, in 1 mol/L of hydrochloric acid. Specifically, the fifth immersion liquid A is an immersion liquid set to an amount corresponding to the solute amount of potassium chloride=25% of the saturated solution amount. The fifth immersion liquid B is an immersion liquid whose amount is set to correspond to the solute amount of potassium chloride=50% of the saturated solution amount. The fifth immersion liquid C is an immersion liquid set to an amount corresponding to 100% of the solute amount of potassium chloride=the amount of the saturated solution.

(First test result-details of test result)
Next, the details of the test results of the first discoloration confirmation test will be described. FIG. 4 is a diagram showing test results of the first discoloration confirmation test. Here, "○" in visual observation in FIG. 4 indicates that discoloration of the exterior material 20 did not occur, "×" in visual observation in FIG.

As shown in FIG. 4, regarding the test results of the first immersion liquid, in the first immersion liquids A to C, it was confirmed that the exterior material 20 was discolored by visual observation, and the color difference ΔE was 10 or more. On the other hand, with the first immersion liquids D and E, it was confirmed by visual observation that the exterior material 20 did not change color, and that the color difference ΔE was less than 10. As for the test results of the second immersion liquids, it was confirmed that the second immersion liquids A and B did not discolor the exterior material 20 by visual observation, and that the color difference ΔE was less than 10. As for the test results of the third immersion liquid, it was confirmed by visual observation that the exterior material 20 did not change color, and that the color difference ΔE was less than 10. Further, as for the test results of the fourth immersion liquid and the fifth immersion liquid, it was confirmed by visual observation that the exterior material 20 was discolored, and that the color difference ΔE was 10 or more.

From the above, the effectiveness of using aluminum chloride, calcium chloride, and magnesium chloride as anti-discoloration agents was confirmed. Furthermore, the effectiveness of setting the solute amount of aluminum chloride to an amount equivalent to 90% to 100% of the saturated solution amount, setting the solute amount of calcium chloride to an amount equivalent to 25% to 90% of the saturated solution amount, and setting the solute amount of magnesium chloride to an amount equivalent to 25% to 100% of the saturated solution amount was also confirmed.

(Effect of Embodiment)
As described above, according to Embodiment 1, the removal step of removing the exterior material 20 from the skeleton body 10, the discoloration prevention step of performing the discoloration prevention process, and the removal step of removing the mortar adhering to the exterior material 20 by immersing the exterior material 20 removed from the skeleton main body 10 in the removal step in an acidic immersion liquid at the same time or after the discoloration prevention step. When the material 20 is used for the skeleton 1 of another building, the exterior material 20 can be securely attached to the skeleton main body 10 of the skeleton 1 . In addition, the discoloration prevention step can prevent discoloration of the exterior material 20 that occurs when the exterior material 20 is immersed in the immersion liquid, and the design of the exterior material 20 can be maintained. As described above, the reusability of the exterior material 20 can be enhanced.

Further, since the discoloration prevention treatment includes a treatment of mixing an anti-discoloration agent into the immersion liquid to prevent discoloration of the exterior material 20, the discoloration of the exterior material 20 can be prevented simply by mixing the anti-discoloration agent into the immersion liquid, and the discoloration prevention treatment can be easily performed.

In addition, since the anti-discoloration agent contains aluminum chloride, calcium chloride, or magnesium chloride, it is possible to prevent discoloration of the exterior material 20 compared to other materials, and to effectively perform discoloration prevention treatment.

When aluminum chloride is dissolved in the immersion liquid, the solute amount of aluminum chloride is set to an amount equivalent to 90% to 100% of the saturated solution amount, when calcium chloride is dissolved in the immersion liquid, the dissolved amount of calcium chloride is set to an amount equivalent to 25% to 90% of the saturated solution amount, or when magnesium chloride is dissolved in the immersion liquid, the dissolved amount of magnesium chloride is set to an amount equivalent to 25% to 100% of the saturated solution amount. It is possible to prevent discoloration and to perform the discoloration prevention treatment more effectively.

[Embodiment 2]
Next, a method for recycling an exterior material according to Embodiment 2 will be described. This Embodiment 2 is a mode in which the discoloration prevention treatment is a treatment of covering the exterior material with a cover material, which will be described later. However, unless otherwise specified, the configuration of the second embodiment is substantially the same as the configuration of the first embodiment, and the configurations that are substantially the same as the configuration of the first embodiment are given the same reference numerals and/or names as those used in the first embodiment as necessary, and the description thereof is omitted.

(composition)
First, the configuration of the frame according to Embodiment 2 will be described. Since the skeleton 1 according to Embodiment 2 is configured in substantially the same manner as the skeleton 1 according to Embodiment 1, the description thereof will be omitted.

(Reproduction method)
Next, a method for recycling an exterior material according to Embodiment 2 will be described. FIG. 5 is a diagram showing a removal step of the regeneration method according to Embodiment 2. FIG. The method for recycling the exterior material 20 according to Embodiment 2 includes a removal process, a discoloration prevention process, a removal process, and a peeling process. Note that the removing process of this reproducing method is the same as the removing process of the reproducing method according to Embodiment 1, so the description thereof will be omitted.

(Reproduction method - discoloration prevention step)
First, the discoloration prevention step will be described. In the discoloration prevention step, discoloration prevention treatment is performed after the removal step.

The specific content of this discoloration prevention treatment is arbitrary, but in the second embodiment, the surface of the exterior material 20 opposite to the surface to which the mortar is attached (in FIG. 5, the lower surface of the exterior material 20; hereinafter referred to as the "opposite surface") is covered with the cover material 60. Specifically, as shown in FIG. 5, in addition to the entire opposite surface of the exterior material 20 removed in the removal step, the cover material 60 is attached so that the front surface, the rear surface, the left surface, and the right surface of the exterior material 20 are covered with the cover material 60 (however, this is not a limitation, and only the entire opposite surface of the exterior material 20 may be covered).

Here, the "cover material 60" is for preventing discoloration of the exterior material 20 (specifically, the surface film 22). In the second embodiment, the cover material 60 is made of a resin material having water resistance, acid resistance, and adhesion properties. Specifically, according to the results of a second test described later, a resin putty material made of the resin material (for example, air conditioner piping putty, etc.), a resin adhesive (for example, hot melt, etc.), a resin tape material (for example, Nitoflon adhesive tape, cloth tape that is a resin adhesive layer, gum tape, vinyl tape, duct tape, etc.), or Resin paints (e.g., water-based strippable paints, oil-based paints (one example is rubber spray (liquid rubber)), etc. Also, the type of the resin material is arbitrary, but for example, polyolefin resin, epoxy resin, synthetic resin ethylene, vinyl acetate resin copolymer, polytetrafluoroethylene, silicone resin, toluene, methyl ethyl ketone, styrenic block copolymer, etc.).

With such a discoloration prevention treatment, discoloration of the exterior material 20 can be prevented simply by covering the opposite surface of the exterior material 20 with the cover material 60, and discoloration prevention treatment can be easily performed. In addition, since the cover material 60 is made of a resin material having water resistance, acid resistance, and adhesion properties, the cover material 60 can have water resistance, acid resistance, and adhesion properties, and usability of the cover material 60 can be enhanced. In addition, since the cover material 60 includes a resin putty material, a resin adhesive, a resin tape material, or a resin paint, a type of the cover material 60 can be used according to the situation, and usability of the cover material 60 can be improved.

(Regeneration method-removal step)
Next, the removing process will be described. The removal step is a step of removing the base material 30 adhering to the exterior material 20 by immersing the exterior material 20 removed from the building body 10 in the removal process in the immersion liquid 70 after the discoloration prevention process.

Specifically, as shown in FIG. 5, first, the exterior material 20 and the base material 30 to which the cover material 60 is attached by discoloration prevention treatment are put into a container 50 containing 1 mol/L hydrochloric acid as the immersion liquid 70. Next, the charged exterior material 20 and base material 30 are immersed in the immersion liquid 70 for a predetermined time. Subsequently, after the immersed exterior material 20 and base material 30 are taken out from the container 50, the base material 30 is removed by spraying washing water on the taken out base material 30 or the like.

(Recycling method - peeling process)
Next, the peeling process will be described. The peeling process is a process of peeling the cover material 60 from the exterior material 20 at the same time as or after the removing process.

Specifically, the cover material 60 is peeled off from the exterior material 20 by spraying washing water on the cover material 60 attached to the exterior material 20, or by peeling off the cover material 60 with an instrument such as a brush or by hand.

According to the above-described regeneration method, mortar adhering to the exterior material 20 can be removed by the removal process in the same manner as the regeneration method according to Embodiment 1, and when the exterior material 20 is used for the skeleton 1 of another building, the exterior material 20 can be reliably attached to the skeleton main body 10 of the skeleton 1. In addition, discoloration of the exterior material 20 caused when the exterior material 20 is immersed in the immersion liquid 70 can be prevented by the discoloration prevention step, and the design of the exterior material 20 can be maintained. Moreover, since the peeling process is performed, the cover material 60 can be peeled off from the exterior material 20, and unnecessary cover material 60 can be removed when the exterior material 20 is reused.

(Second test result)
Next, the results of the second test conducted by the applicant will be described. Here, a second discoloration confirmation test, a first usability confirmation test, and a second usability confirmation test for various cover materials will be described.

(Second test result-outline of the second discoloration confirmation test)
First, an outline of the second discoloration confirmation test will be described. Here, the “second discoloration confirmation test” is a test for confirming whether or not the test body (specifically, the surface film 22) changes color when the test body to which the various cover materials are attached is immersed in an acidic immersion liquid.

Although the test method for this second discoloration confirmation test is arbitrary, it is as follows. That is, first, using a known color difference meter, color measurements are performed on specimens corresponding to various cover materials. Next, after attaching various cover materials to the corresponding test bodies, the test bodies are placed in containers corresponding to the various cover materials and containing an immersion liquid (1 mol / L hydrochloric acid) and immersed for 14 days. After 144 hours have passed since the immersion, the specimens corresponding to the various cover materials are visually observed. Furthermore, after performing the above-described color measurement again on specimens corresponding to various cover materials, a known method is used to calculate the color difference ΔE based on the color measurements before and after immersion.

Here, the specimen used in the second discoloration confirmation test is the same tile material as the specimen used in the first discoloration confirmation test. Specifically, the tile materials attached at different positions on the demolished wall are used as specimens for each of the various cover materials.

The cover materials used in the second discoloration confirmation test are classified into the first to thirteenth cover materials. Among these, the first cover material is oil clay, and specifically, it is composed of calcium carbonate, lubricating oil, vegetable oil, and the like. Further, the second cover material is an air conditioner pipe putty, and specifically, it is composed of a polyolefin resin, a filler, a pigment, and the like. Further, the third cover material is an underwater bond, and specifically, it is configured to contain epoxy resin, polyamidoamine, and the like. Further, the fourth cover material is water-based strippable, and specifically, it is composed of DME, a synthetic resin, a pigment, and the like. Further, the fifth cover material is Quick Mender, and specifically, it is composed of epoxy resin, polythiol, tertiary amine, and the like. Further, the sixth cover material is a hot-melt material, and specifically, includes synthetic resin ethylene, vinyl acetate resin copolymer, plastic, and the like. Further, the seventh cover material is a Nitoflon adhesive tape, and specifically, it is configured to contain polytetrafluoroethylene, silicone-based resin, and the like. Further, the eighth cover material is a rubber spray, and specifically includes toluene, methyl ethyl ketone, styrenic block copolymer, and the like. Moreover, the ninth cover material is a packing tape, and specifically, it is configured to contain polypropylene or the like. Moreover, the tenth cover material is a vinyl tape, and specifically, it is configured to contain polyvinyl chloride or the like. Further, the eleventh cover material is a duct tape, and specifically, it is configured to contain polyethylene po or the like. The twelfth cover material has a hot-melt lower layer and a saran wrap (registered trademark) upper layer, and specifically includes polyvinylidene chloride, a fatty acid derivative, and an epoxidized vegetable oil. The thirteenth cover material has a hot-melt lower layer and a curing film for metal surfaces as an upper layer, and specifically includes a polyethylene film, an acrylic pressure-sensitive adhesive, and the like.

(Second test result-details of the test result of the second discoloration confirmation test)
Next, the details of the test results of the second discoloration confirmation test will be described. FIG. 6 is a diagram showing test results of the second discoloration confirmation test.

As shown in FIG. 6, for the test results of the first cover material, the second cover material, and the fourth cover material to the thirteenth cover material, visual observation = it was confirmed that the exterior material 20 did not discolor, and it was confirmed that the color difference ΔE was less than 10. On the other hand, as for the test results of the third cover material, it was confirmed by visual observation that the exterior material 20 was discolored and that the color difference ΔE was 10 or more.

From the above, the effectiveness of using a resin putty material, a resin adhesive, a resin tape material, and a resin paint as the cover material has been confirmed.

(Second test result-Outline of the first usability confirmation test)
Next, an outline of the first usability confirmation test will be described. Here, the "first usability confirmation test" is a test for confirming the usability when various cover materials are used in a recycling method, and specifically includes a water stoppage test, an acid resistance test, an adhesion test, and a workability test.

Although the test method for this first usability confirmation test is arbitrary, it is as follows. That is, for the water stoppage test, first, a test piece with various cover materials attached is placed in a container containing an immersion liquid (1 mol/L hydrochloric acid) and immersed for 14 days. Next, after removing the various cover materials from each specimen, litmus paper is attached to the cover material side surface of each specimen. Then, based on the color change of the litmus paper, it is confirmed whether or not the cover material is waterproof. As for the acid resistance test, a test piece with various cover materials attached is placed in a container containing the immersion liquid and immersed for 14 days. Then, after removing the cover material from each test body, it is confirmed whether or not the surface of the cover material side of each test body has changed color. In addition, for the adhesion test, a test body attached with various cover materials is placed in a container containing the immersion liquid and immersed for 14 days (the capacity of the immersion liquid in the container is set to an amount that applies a hydraulic head pressure of 5 kPa to the test body). After that, it is checked whether or not the various cover materials are peeled off from the specimen. In addition, regarding the workability test, the degree of workability of various cover materials is confirmed based on the effort (e.g., the number of work steps, work time, etc.) when attaching various cover materials in the water stop test and the effort when removing various cover materials from the test body after immersion.

Here, the test piece used in the first usability confirmation test was the same tile material as the test piece used in the second discoloration confirmation test. Specifically, the tile material attached at different positions on the dismantled wall for each type of cover material was used as the test piece.

Further, the cover materials used in the first usability confirmation test are divided into the first to thirteenth cover materials in the same manner as in the second discoloration confirmation test.

(Second test result-details of test result of the first usability confirmation test)
Next, the details of the test results of the first usability confirmation test will be described. FIG. 7 is a diagram showing test results of the first usability confirmation test. Here, “◎” in FIG. 7 indicates that it is very good, “◯” in FIG. 7 indicates that it is good, “△” in FIG. 7 indicates that it is neither good nor bad, and “×” in FIG.

As shown in FIG. 7, first, regarding the results of the water stoppage test, it was confirmed that the first to thirteenth cover members had substantially good water stoppage performance. As for the results of the acid resistance test, it was confirmed that the first to thirteenth cover materials had substantially good acid resistance. In addition, regarding the results of the adhesion test, it was confirmed that although the adhesion of the second cover material and the fourth to thirteenth cover materials was good, the adhesion of the first cover material and the third cover material was not good. In addition, regarding the results of the workability test, it was confirmed that the workability of the first cover material, the second cover material, the fourth cover material to the 13th cover material was almost good, but the workability of the third cover material was not good. Based on these facts, the overall evaluation of the 2nd cover material and the 5th to 11th cover materials was good, but the overall evaluation of the 4th cover material, the 12th cover material, and the 13th cover material was neither good nor bad, and it was confirmed that the overall evaluation of the 1st cover material and the 3rd cover material was not good.

From the above, it was confirmed that the resin putty material, the resin adhesive, the resin tape material, and the resin paint are effective as the cover material.

(Second Test Results - Summary of Second Usability Confirmation Test)
Next, an outline of the second usability confirmation test will be described. Here, the "second usability confirmation test" is a test in which the first usability confirmation test is performed on various types of cover materials for each type of specimen.

Although the test method for the second usability confirmation test is arbitrary, it is the same as the test method for the first usability confirmation test.

In addition, although the specimen used in the second usability confirmation test was the same tile material as the specimen used in the first discoloration confirmation test, the shape of the surface of the specimen on the surface film side was characteristic. Specifically, the first test piece has a flat surface on the surface film side, the second test piece has a porous surface (a shape with fine holes) on the surface film side, and the third test piece has an uneven surface on the surface film side.

Further, the cover materials used in the second usability confirmation test are divided into the first to thirteenth cover materials in the same manner as in the first usability confirmation test.

(Second Test Results-Details of Second Usability Confirmation Test Results)
Next, the details of the test results of the second usability confirmation test will be described. FIG. 8 is a diagram showing test results of the second usability confirmation test.

As shown in FIG. 8, regarding the results of the first specimen (specifically, the comprehensive evaluation of the first usability confirmation test for the first specimen), the results of the second specimen (specifically, the comprehensive evaluation of the first usability confirmation test of the second specimen), and the results of the third specimen (specifically, the comprehensive evaluation of the first usability confirmation test of the third specimen), the results of the first cover material, the second cover material, and the fourth to thirteenth cover materials were almost good, but the results of the third cover material were good. It was confirmed that the results were not good. Based on this, it was confirmed that the overall evaluation of the 2nd cover material, the 4th cover material, the 7th cover material to the 11th cover material was good, but the overall evaluation of the 1st cover material, the 5th cover material, the 6th cover material, the 12th cover material, and the 13th cover material was neither good nor bad, and the overall evaluation of the 3rd cover material was not good.

From the above, it was confirmed that the resin putty material, the resin adhesive, the resin tape material, and the resin paint are effective as the cover material.

(Effect of Embodiment)
As described above, according to the second embodiment, the discoloration prevention treatment includes the treatment of covering the surface of the exterior material 20 opposite to the surface to which the mortar adheres with the cover material 60. Therefore, the discoloration of the exterior material 20 can be prevented simply by covering the opposite surface of the exterior material 20 with the cover material 60, and the discoloration prevention treatment can be easily performed.

In addition, since a peeling process for peeling the cover material 60 from the exterior material 20 is included at the same time as or after the removal process, the cover material 60 can be peeled from the exterior material 20, and the unnecessary cover material 60 can be removed when the exterior material 20 is reused.

In addition, since the cover material 60 is made of a resin material having water resistance, acid resistance, and adhesion properties, the cover material 60 can have water resistance, acid resistance, and adhesion properties, and usability of the cover material 60 can be enhanced.

In addition, since the cover material 60 includes a resin putty material, a resin adhesive, a resin tape material, or a resin paint, a type of the cover material 60 can be used according to the situation, and usability of the cover material 60 can be improved.

[III] Modifications to the Embodiments Although the embodiments of the present invention have been described above, the specific configuration and means of the present invention can be arbitrarily modified and improved within the scope of the technical ideas of each invention described in the claims. Such modifications will be described below.

(Problem to be solved and effect of invention)
First, the problems to be solved by the invention and the effects of the invention are not limited to the above-described contents, and the present invention can solve problems not described above, achieve effects not described above, solve only a part of the problems described above, or achieve only a part of the effects described above.

(Regarding shapes, numbers, structures, and time series)
Regarding the constituent elements illustrated in the embodiments and drawings, the shape, numerical value, structure of multiple constituent elements or interrelationships in chronological order can be arbitrarily modified and improved within the scope of the technical idea of the present invention.

(Combination of each embodiment)
The configurations shown in the first and second embodiments can be combined with each other. For example, a part of the exterior materials 20 in the skeleton 1 may be regenerated using the regeneration method according to the first embodiment, and another part of the exterior materials 20 in the skeleton 1 may be regenerated using the regeneration method according to the second embodiment.

(About immersion liquid)
In Embodiments 1 and 2 above, the immersion liquid 70 is described to be 1 mol/L hydrochloric acid, but the present invention is not limited to this. For example, an acid other than hydrochloric acid (eg, sulfuric acid, etc.) may be used. Alternatively, it may be hydrochloric acid with a molar concentration of more than 1 mol/L, or it may be hydrochloric acid with a molar concentration of less than 1 mol/L.

(About anti-tarnishing agent)
In Embodiment 1 above, the anti-discoloration agent is described as containing any one of aluminum chloride, calcium chloride, and magnesium chloride, but is not limited to this, and may contain two or more of aluminum chloride, calcium chloride, or magnesium chloride, for example.

(About cover material)
In the above-described second embodiment, the cover material 60 is made of a resin material having waterproof, acid-resistant, and adhesive properties, but the present invention is not limited to this. For example, it may be formed of a resin material having only one or both of water stopping properties, acid resistance, and adhesion properties as long as discoloration of the exterior material 20 can be prevented.

(Regarding playback method)
In the second embodiment, the regeneration method includes the peeling step, but the present invention is not limited to this. For example, if the cover material 60 does not need to be peeled off from the exterior material 20 (for example, if the cover material 60 is a resin paint), the peeling process may be omitted.

(Appendix)
The exterior material recycling method of appendix 1 is a regeneration method for regenerating exterior materials attached via mortar to a building frame that constitutes a frame of a building, comprising: a removal step of removing the exterior materials from the frame body; a discoloration prevention step of performing a discoloration prevention treatment to prevent discoloration of the exterior materials; and a removing step of removing the mortar adhering to the exterior material by immersing it in an immersion liquid.

The exterior material recycling method of appendix 2 is the exterior material regeneration method of appendix 1, wherein the discoloration prevention treatment includes mixing a discoloration prevention agent for preventing discoloration of the exterior material into the immersion liquid.

The method for regenerating an exterior material according to Appendix 3 is the method for regenerating an exterior material according to Appendix 2, wherein the anti-discoloration agent contains aluminum chloride, calcium chloride, or magnesium chloride.

The exterior material regeneration method of Appendix 4 is the exterior material regeneration method of Appendix 3, wherein in the discoloration prevention step, when the aluminum chloride is dissolved in the immersion liquid, the solute amount of the aluminum chloride is set to an amount equivalent to 90% to 100% of the saturated solution amount, when the calcium chloride is dissolved in the immersion liquid, the dissolved amount of the calcium chloride is set to an amount equivalent to 25% to 90% of the saturated solution amount, or when the magnesium chloride is dissolved in the immersion liquid. , the solute amount of the magnesium chloride is set to an amount corresponding to 25% to 100% of the amount of the saturated solution.

The exterior material recycling method of Appendix 5 is the exterior material regeneration method according to any one of Appendixes 1 to 4, wherein the discoloration prevention treatment includes covering the surface of the exterior material opposite to the surface to which the mortar was attached with a cover material.

The method for recycling an exterior material according to appendix 6 is the method for recycling an exterior material according to appendix 5, including a peeling step of peeling the cover material from the exterior material simultaneously with or after the removing step.

The method for recycling an exterior material of Appendix 7 is the method for recycling an exterior material according to Appendix 5 or 6, wherein the cover material is made of a resin material having water resistance, acid resistance, and adhesiveness.

The exterior material recycling method of Appendix 8 is the exterior material recycling method according to any one of Appendixes 5 to 7, wherein the cover material includes a resin putty material, a resin adhesive, a resin tape material, or a resin paint.

(Effect of Supplementary Note)
According to the exterior material recycling method described in appendix 1, since it includes a removal step of removing the exterior material from the building body, a discoloration prevention process of performing discoloration prevention treatment, and a removal process of removing mortar adhering to the exterior material by immersing the exterior material removed from the building body in the removal process in an acidic immersion liquid at the same time or after the discoloration prevention process, the mortar adhering to the exterior material can be removed by the removal process, and the exterior material can be removed from the exterior material in another building. When used for a skeleton, the exterior material can be reliably attached to the skeleton main body of the skeleton. In addition, the discoloration prevention step can prevent discoloration of the exterior material that occurs when the exterior material is immersed in the immersion liquid, and the design of the exterior material can be maintained. As described above, the reusability of the exterior material can be enhanced.

According to the exterior material recycling method described in appendix 2, the discoloration prevention treatment includes a process of mixing a discoloration inhibitor into the immersion liquid to prevent discoloration of the exterior material. Therefore, the discoloration of the exterior material can be prevented simply by mixing the discoloration inhibitor into the immersion liquid, and the discoloration prevention treatment can be easily performed.

According to the exterior material regeneration method described in Appendix 3, since the discoloration inhibitor contains aluminum chloride, calcium chloride, or magnesium chloride, the exterior material can be prevented from being discolored compared to other materials, and discoloration prevention treatment can be effectively performed.

According to the exterior material regeneration method described in appendix 4, in the discoloration prevention step, when aluminum chloride is dissolved in the immersion liquid, the solute amount of aluminum chloride is set to an amount equivalent to 90% to 100% of the saturated solution amount, when calcium chloride is dissolved in the immersion liquid, the solute amount of calcium chloride is set to an amount equivalent to 25% to 90% of the saturated solution amount, or when magnesium chloride is dissolved in the immersion liquid, the solute amount of magnesium chloride is set to 25% to 100% of the saturated solution amount. , it is possible to prevent discoloration of the exterior material compared to other solute amounts, and it is possible to perform the discoloration prevention treatment more effectively.

According to the exterior material recycling method described in appendix 5, the discoloration prevention treatment includes the treatment of covering the surface of the exterior material opposite to the surface to which the mortar is attached with the cover material. Therefore, the discoloration of the exterior material can be prevented simply by covering the opposite surface of the exterior material with the cover material, and the discoloration prevention treatment can be easily performed.

According to the exterior material recycling method described in appendix 6, since the peeling step of peeling the cover material from the exterior material is included at the same time as or after the removal process, the cover material can be peeled from the exterior material, and unnecessary cover material can be removed when the exterior material is reused.

According to the method for recycling an exterior material described in appendix 7, since the cover material is made of a resin material having water resistance, acid resistance, and adhesion properties, the cover material can have water resistance, acid resistance, and adhesion properties, and the usability of the cover material can be enhanced.

According to the exterior material recycling method described in appendix 8, the cover material includes a resin putty material, a resin adhesive, a resin tape material, or a resin paint.

REFERENCE SIGNS LIST 1 framework 10 framework body 20 exterior material 21 exterior material body 22 surface film 30 base material 40 immersion liquid containing anti-tarnishing agent 50 container 60 cover material 70 immersion liquid

Claims (3)

A regeneration method for regenerating an exterior material attached via mortar to a frame body constituting a frame of a building, comprising:
a removing step of removing the exterior material from the skeleton main body;
a discoloration prevention step of performing discoloration prevention treatment for preventing discoloration of the exterior material;
Simultaneously with or after the discoloration preventing step, the mortar adhering to the exterior material is removed by immersing the exterior material removed from the skeleton body in the removal process in an acidic immersion liquid,
The discoloration prevention treatment includes a treatment of mixing a discoloration prevention agent for preventing discoloration of the exterior material into the immersion liquid,
The discoloration inhibitor comprises aluminum chloride or magnesium chloride,
A method of recycling exterior materials. In the discoloration prevention step,
When the aluminum chloride is dissolved in the immersion liquid, the solute amount of the aluminum chloride is set to an amount corresponding to 90% to 100% of the saturated solution amount,
Alternatively, when the magnesium chloride is dissolved in the immersion liquid, the solute amount of the magnesium chloride is an amount equivalent to 25% to 100% of the saturated solution amount,
The method for recycling the exterior material according to claim 1 . A regeneration method for regenerating an exterior material attached via mortar to a frame body constituting a frame of a building, comprising:
a removing step of removing the exterior material from the skeleton main body;
a discoloration prevention step of performing discoloration prevention treatment for preventing discoloration of the exterior material;
Simultaneously with or after the discoloration preventing step, the mortar adhering to the exterior material is removed by immersing the exterior material removed from the skeleton body in the removal process in an acidic immersion liquid,
The discoloration prevention treatment includes a treatment of covering the surface of the exterior material opposite to the surface to which the mortar is attached with a cover material,
Simultaneously with or after the removing step, a peeling step of peeling the cover material from the exterior material,
The covering material is a rubber spray ,
A method of recycling exterior materials.

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