JP2015223531A - Coating-film removing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coating-film removing method capable of performing a coating-film removing work efficiently.SOLUTION: A coating-film removing method for peeling a coating-film 3 coated on a substrate 2, from the substrate 2 by using water, and for removing the coating-film 3 by collecting the peeled coating film 10, is characterized in that the collection of the coating film 10 peeled from the substrate 2 is performed by using first hydrophilic nonwoven fabric 8A laid on the ground surface 4 in front of the substrate 2.

Description

  The present invention relates to a coating film removing method.

  When peeling a deteriorated coating film from a base material such as an outer wall material of a building or a side wall of a veranda, peeling with water is generally performed.

  At this time, the peeled coating film is scattered and falls toward the ground surface or the floor surface. Here, when the ground surface is a gravel surface or the floor surface is composed of slats, the peeled coating enters the gravel or slats, making it difficult to collect the coating. For this reason, much time is needed for the collection | recovery operation | work of a coating film, and the operation | work from peeling and recovering a coating film, ie, the efficiency of a coating-film removal operation, falls.

  Therefore, for example, as disclosed in Patent Document 1 below, it has been proposed to collect a coating film using a box or a bowl-shaped body.

JP 2005-161286 A

  However, the method of Patent Document 1 has the following problems.

  That is, when recovering a coating film by a box or a bowl-shaped body, the coating film peeled off and scattered cannot be recovered sufficiently, and the coating film falls on the ground or the floor surface. At this time, since it is difficult to recover the coating film that has fallen on the ground or floor surface, it takes a considerable amount of time to recover the coating film, and the removal operation of the coating film becomes considerably inefficient. In particular, when the coating film enters a gravel surface or the like, the removal operation of the coating film becomes even more inefficient.

  This invention is made | formed in view of the said situation, and it aims at providing the coating-film removal method which can perform a coating-film removal operation | work efficiently.

  The present inventors diligently studied to solve the above problems. As a result, it was considered to lay a sheet on the ground or floor surface in front of the substrate. However, when the present inventors laid a hydrophobic water-impermeable sheet as the sheet, the coating film remains on the sheet together with water, and this water hinders work such as sliding the operator's feet. I realized that Here, if it is going to collect | recover the coating films on a sheet | seat, a coating film will flow down from the sheet | seat surface with water, and a coating film cannot be efficiently collect | recovered after all. Therefore, as a result of further earnest studies, the present inventors have found that the above-described problems can be solved by the following invention.

  That is, the present invention provides a coating film removing method for removing the coating film by peeling the coating film coated on the substrate from the substrate using water and collecting the peeled coating film. A method of removing a coating film, wherein the coating film peeled from the substrate is collected using a first hydrophilic nonwoven fabric laid on the ground or floor surface in front of the substrate. .

  According to this invention, if a coating film is peeled from a base material using water, the peeled coating film will scatter to the front of a base material, and will fall toward the ground surface or a floor surface. At that time, since the first hydrophilic nonwoven fabric is laid on the ground or floor surface, the coating film falls on the first hydrophilic nonwoven fabric together with water, and the coating film is sufficiently suppressed from falling directly on the ground surface or floor surface. Is done. Moreover, since the first hydrophilic nonwoven fabric has hydrophilicity, water is likely to pass through the first hydrophilic nonwoven fabric. For this reason, a coating film becomes easy to remain on a 1st hydrophilic nonwoven fabric. As a result, water hardly remains on the first hydrophilic nonwoven fabric, and this water is sufficiently prevented from interfering with the coating film peeling operation. Moreover, when a coating film is isolate | separated from water, it will become easy to get entangled with a 1st hydrophilic nonwoven fabric. For this reason, it becomes possible to collect a coating film firmly with a 1st hydrophilic nonwoven fabric. In other words, since the first hydrophilic nonwoven fabric sufficiently prevents the coating from entering the ground or floor surface, it is possible to save time for collecting the coating that has entered the ground or floor surface. It becomes. From the above, according to the coating film removing method of the present invention, the coating film removing operation can be performed efficiently.

  Moreover, in the said coating-film removal method, the collection of the said coating film peeled from the said base material was laid so that the said base material and the edge part by the side of the said base material might be tied among said 1st hydrophilic nonwoven fabrics. It is preferable to carry out by further using the second hydrophilic nonwoven fabric.

  In this case, even if a foundation made of, for example, a concrete block of a house exists between the base material and the ground or floor surface, the foundation is covered with the second hydrophilic nonwoven fabric, so that the coating film Adherence to the foundation is sufficiently suppressed. For this reason, the work of scraping the foundation with a brush or the like after the paint film peeling work is completed can be omitted, and the efficiency of the paint film removing work is further improved. Further, the second hydrophilic nonwoven fabric is easy to allow water to permeate. For this reason, after a coating film adheres to a 2nd hydrophilic nonwoven fabric, it is fully suppressed that it flows into a 1st hydrophilic nonwoven fabric with water. For this reason, clogging hardly occurs in the first hydrophilic nonwoven fabric, and the first hydrophilic nonwoven fabric can be used for a longer time.

  Furthermore, in the coating film removing method, the third hydrophilic layer is constructed so that the collection of the coating film peeled off from the base material is laid so as to rise from the end portion on the side opposite to the base material in the first hydrophilic nonwoven fabric. It is preferable to carry out by further using a conductive nonwoven fabric.

  When peeling a coating film from a base material, a coating film may be scattered to the position away from the base material. In that respect, if the third hydrophilic nonwoven fabric is laid so as to stand up from the end opposite to the base material of the first hydrophilic nonwoven fabric, the coating film that scatters to such a distance is formed by the third hydrophilic nonwoven fabric. It is possible to collect. In addition, the third hydrophilic nonwoven fabric easily allows water to pass therethrough. For this reason, after a coating film adheres to a 3rd hydrophilic nonwoven fabric, it is fully suppressed that it flows into a 1st hydrophilic nonwoven fabric with water. For this reason, clogging hardly occurs in the first hydrophilic nonwoven fabric, and the first hydrophilic nonwoven fabric can be used for a longer time.

  In the present invention, the “hydrophilic nonwoven fabric” refers to a nonwoven fabric having a water absorption time of 2 seconds or more as measured in accordance with 7.1.1 of JIS L 1907: 2010. Here, the water absorption time refers to the time from when the water droplet reaches the surface of the test piece made of a hydrophilic non-woven fabric until the specular reflection disappears and only wetness remains as the test piece absorbs the water droplet.

  ADVANTAGE OF THE INVENTION According to this invention, the coating-film removal method which can perform a coating-film removal operation | work efficiently is provided.

It is a partial section surface end view showing signs that a hydrophilic nonwoven fabric is laid among the first embodiment of the paint film removal method of the present invention. It is a partial section surface end view which shows a mode that a coating film is peeled from a base material using water among 1st Embodiment of the coating-film removal method of this invention, and is collected. It is a partial cut surface end view which shows 2nd Embodiment of the coating-film removal method of this invention. It is a partial cut surface end view which shows 3rd Embodiment of the coating-film removal method of this invention.

  Hereinafter, embodiments of the coating film removing method of the present invention will be described in detail with reference to FIGS. 1 and 2. FIG. 1 is a partially cut end view showing a state in which a hydrophilic nonwoven fabric is laid out in the first embodiment of the coating film removing method of the present invention, and FIG. 2 is a diagram of the first embodiment of the coating film removing method of the present invention. It is a partial cut surface end view which shows a mode that a coating film is peeled from a base material and collected using water.

  First, the object for removing the coating film of the present invention will be described. As shown in FIG. 1, an object for removing a coating film in this embodiment is an outer wall material 1, and the outer wall material 1 includes a base material 2 and a coating film 3 provided on the base material 2.

  Next, the coating film removal method of the outer wall material 1 mentioned above is demonstrated. First, in FIG. 1, reference numeral 4 is the ground, and a foundation 5 of a house made of concrete or the like is embedded in the ground 4. An outer wall 6 is provided on the foundation 5, and the outer wall material 1 is fixed to the surface of the outer wall 6. In the present embodiment, a fence 7 is embedded in the ground 4. The fence 7 is disposed substantially parallel to the base material 2 at a position facing the base material 2 of the outer wall material 1.

  Next, a method for removing the coating film 3 on the outer wall material 1 will be described.

  First, a hydrophilic nonwoven fabric 8 is prepared. As the hydrophilic nonwoven fabric 8, in this embodiment, the 1st hydrophilic nonwoven fabric 8A, the 2nd hydrophilic nonwoven fabric 8B, and the 3rd hydrophilic nonwoven fabric 8C are prepared separately.

  Then, the first hydrophilic nonwoven fabric 8A is laid in a planar shape on the ground 4 in front of the substrate 2. At this time, the end of the first hydrophilic nonwoven fabric 8A on the base 2 side may be directly under the base 2 or may be not directly under the base 2 but may be directly under the base 2. preferable. In this case, the peeled coating film (hereinafter referred to as “waste coating film”) 10 can be collected more sufficiently.

  The 2nd hydrophilic nonwoven fabric 8B is laid so that the base material 2 and the edge part by the side of the base material 2 among 1st hydrophilic nonwoven fabric 8A may be tied. In the present embodiment, the second hydrophilic nonwoven fabric 8B is laid so as to cover the foundation 5.

  The third hydrophilic nonwoven fabric 8 </ b> C is laid so as to rise from the end of the first hydrophilic nonwoven fabric 8 </ b> A on the side opposite to the base 2 toward the direction away from the ground 4. In the present embodiment, the third hydrophilic nonwoven fabric 8C is laid so as to cover the fence 7. The order of laying the first hydrophilic nonwoven fabric 8A, the second hydrophilic nonwoven fabric 8B, and the third hydrophilic nonwoven fabric 8C is arbitrary. For example, the first hydrophilic nonwoven fabric 8A, the second hydrophilic nonwoven fabric 8B, and the third hydrophilic nonwoven fabric 8C may be laid in this order, or the second hydrophilic nonwoven fabric 8B, the third hydrophilic nonwoven fabric 8C, and the first hydrophilic nonwoven fabric 8A. Alternatively, the third hydrophilic nonwoven fabric 8C, the first hydrophilic nonwoven fabric 8A, and the second hydrophilic nonwoven fabric 8B may be laid in this order.

  After laying the hydrophilic nonwoven fabric 8 in this way, a high-pressure water jetting device having a nozzle 9 is prepared. Then, an operator having a high-pressure water jetting device is placed on the hydrophilic nonwoven fabric 8A. Then, the tip of the nozzle 9 is directed to the coating film 3 of the outer wall material 1, and as shown in FIG. 2, high-pressure water is sprayed from the nozzle 9, and the coating film 3 is peeled off from the substrate 2 by the water pressure of the high-pressure water. The waste coating film 10 is collected by the hydrophilic nonwoven fabric 8.

  At this time, the waste coating film 10 scatters in front of the base material 2 and falls toward the ground 4. At that time, since the first hydrophilic nonwoven fabric 8A is laid on the ground 4, it is sufficient that the waste coating film 10 falls on the first hydrophilic nonwoven fabric 8A together with the water 11, and the waste coating film 10 falls on the ground 4. To be suppressed. Moreover, since the first hydrophilic nonwoven fabric 8A has hydrophilicity, the water 11 is likely to pass through the first hydrophilic nonwoven fabric 8A. For this reason, only the waste coating film 10 tends to remain on the first hydrophilic nonwoven fabric 8A. As a result, since the water 11 hardly remains on the first hydrophilic nonwoven fabric 8A, the water 11 is sufficiently prevented from interfering with the peeling operation of the coating film 3. Moreover, when the waste coating film 10 is separated from the water 11, the first hydrophilic nonwoven fabric 8A is easily entangled. For this reason, it becomes possible to collect the waste coating film 10 with the 1st hydrophilic nonwoven fabric 8A firmly. In other words, since the first hydrophilic nonwoven fabric 8A sufficiently prevents the waste coating film 10 from entering the ground 4, the time for collecting the waste coating film 10 that has entered the ground 4 may be omitted. It becomes possible. Further, the first hydrophilic nonwoven fabric 8A, the second hydrophilic nonwoven fabric 8B, and the third hydrophilic nonwoven fabric 8C are nonwoven fabrics. For this reason, the 1st hydrophilic nonwoven fabric 8A, the 2nd hydrophilic nonwoven fabric 8B, and the 3rd hydrophilic nonwoven fabric 8C are easy to wind up, since they are easy to roll up and not bulky. Therefore, the work of cleaning up the waste coating film 10 becomes easy. From the above, according to the coating film removing method of the present embodiment, the coating film removing work of the outer wall material 1 can be performed efficiently.

  In the present embodiment, the waste coating film 10 is also collected by the second hydrophilic nonwoven fabric 8B laid so as to connect the base material 2 and the end portion on the base material 2 side of the first hydrophilic nonwoven fabric 8A. Done. For this reason, since the foundation 5 existing between the base material 2 of the outer wall material 1 and the ground 4 is covered with the second hydrophilic nonwoven fabric 8B, the waste coating film 10 is sufficiently adhered to the foundation 5. It is suppressed. For this reason, it is possible to omit the work of scraping the foundation 5 with a brush or the like after the paint film peeling work is completed, and the efficiency of the paint film removing work is further improved. Further, the second hydrophilic nonwoven fabric 8B easily allows the water 11 to pass therethrough. For this reason, after the waste coating film 10 adheres to the 2nd hydrophilic nonwoven fabric 8B, it is fully suppressed that it flows into the 1st hydrophilic nonwoven fabric 8A together with the water 11. For this reason, clogging does not easily occur in the first hydrophilic nonwoven fabric 8A, and the first hydrophilic nonwoven fabric 8A can be used for a longer time.

  Furthermore, in the present embodiment, the collection of the waste coating film 10 is also performed by the third hydrophilic nonwoven fabric 8C laid so as to rise from the end of the first hydrophilic nonwoven fabric 8A opposite to the outer wall material 1. In this case, the following advantages are obtained. That is, when the coating film 3 is peeled from the base material 2, the waste coating film 10 may be scattered to a position far from the base material 2. In that regard, if the third hydrophilic nonwoven fabric 8C is laid so as to stand up from the end opposite to the base member 2 in the first hydrophilic nonwoven fabric 8A, the waste coating film 10 that scatters to such a distance can be obtained. It becomes possible to collect by 3 hydrophilic nonwoven fabric 8C. Moreover, since the 3rd hydrophilic nonwoven fabric 8C has hydrophilicity, it is easy to permeate | transmit the water 11. FIG. For this reason, after the waste coating film 10 adheres to the third hydrophilic nonwoven fabric 8C, it is sufficiently suppressed that the waste coating film 10 flows down to the first hydrophilic nonwoven fabric 8A together with the water 11. For this reason, clogging does not easily occur in the first hydrophilic nonwoven fabric 8A, and the first hydrophilic nonwoven fabric 8A can be used for a longer time.

  Furthermore, in the present embodiment, the first hydrophilic nonwoven fabric 8A, the second hydrophilic nonwoven fabric 8B, and the third hydrophilic nonwoven fabric 8C are prepared separately, and these can be easily wound up and are not bulky. Easy to carry. Therefore, the cleaning operation of the first hydrophilic nonwoven fabric 8A, the second hydrophilic nonwoven fabric 8B, and the third hydrophilic nonwoven fabric 8C becomes easier.

  The pressure of the high-pressure water is not particularly limited as long as it does not destroy the base material 2 exposed by the peeling of the coating film 3, and may be, for example, about 10 to 100 MPa. The amount of high-pressure water is not particularly limited, and may be, for example, about 5 to 20 L / min. Furthermore, the injection time of the high-pressure water cannot be generally described, and may be about 1 to 10 seconds, for example.

  Next, the outer wall material 1 and the hydrophilic nonwoven fabric 8 will be described in detail.

(Outer wall material)
As described above, the outer wall material 1 includes the base material 2 and the coating film 3 provided on the base material 2. As the base material 2, for example, ceramic siding material, cement, mortar, steel plate and the like can be used.

(Hydrophilic nonwoven fabric)
In the present embodiment, the hydrophilic nonwoven fabric 8 is composed of a first hydrophilic nonwoven fabric 8A, a second hydrophilic nonwoven fabric 8B, and a third hydrophilic nonwoven fabric 8C. The 1st hydrophilic nonwoven fabric 8A, the 2nd hydrophilic nonwoven fabric 8B, and the 3rd hydrophilic nonwoven fabric 8C may be comprised with the mutually same material, and may be comprised with a different material.

  The hydrophilic nonwoven fabric 8 can be obtained by performing a hydrophilic treatment on the nonwoven fabric material.

  Examples of the non-woven material include PP (polypropylene), PE (polyethylene), nylon, polyester, rayon, vinylon, cellulose, polyurethane, polylactic acid, and blends thereof. Of these, polypropylene, polyethylene, and polyester are preferably used.

  Examples of the hydrophilic treatment include a method of heating a nonwoven material after being immersed in a solution containing a silane coupling agent, a method of treating with a surfactant, and a method of plasma treating a nonwoven material. Here, examples of the plasma treatment include corona discharge treatment. As the hydrophilic treatment, among the above methods, a method of treating a nonwoven fabric material with a surfactant is preferable from the viewpoint of low cost.

The mass per unit area of the hydrophilic nonwoven fabric 8 (hereinafter referred to as “weight per unit area”) is not particularly limited, but is preferably 10 to 100 g / m ² , and is 20 to 60 g / m ² . More preferably. If the basis weight is in the range of 10 to 100 g / ^{m 2,} the hydrophilic nonwoven 8 is less likely to tear as compared with the case of less than 10 g / ^{m 2,} compared to the case of more than 100 g / ^{m 2,} permeability of the hydrophilic nonwoven fabric 8 The property becomes more excellent.

  The maximum pore diameter of the hydrophilic nonwoven fabric 8 is not particularly limited, but is preferably 100 μm or less, and more preferably 50 μm or less.

  Furthermore, the thickness of the hydrophilic nonwoven fabric 8 is not particularly limited, but is preferably in the range of 0.01 to 1.0 mm. When the thickness of the hydrophilic nonwoven fabric 8 is in the range of 0.01 to 1.0 mm, the hydrophilic nonwoven fabric 8 is harder to break than when the thickness is less than 0.01 mm. 5 can be easily deformed along the wall surface 5 or the ground surface 4, or collapsed when discarded after the completion of the coating film removal operation.

  The present invention is not limited to the above embodiment. For example, in the said embodiment, although the coating film 3 is peeled from the base material 2 using the high pressure water injected from a high pressure water injection apparatus, it is not necessary to always use high pressure water. For example, the coating film 3 may be peeled off from the substrate 2 using low pressure water and a brush together. In this case, as the outer wall material 1, an outer wall material using ALC (lightweight cellular concrete) as the base material 2 can be used as an object for removing the coating film of the present invention.

  In the above embodiment, the first hydrophilic nonwoven fabric 8A, the second hydrophilic nonwoven fabric 8B, and the third hydrophilic nonwoven fabric 8C are used as the hydrophilic nonwoven fabric 8, but the second hydrophilic nonwoven fabric 8B and the third hydrophilic nonwoven fabric 8B are used. At least one of the nonwoven fabrics 8C may be composed of a hydrophobic nonwoven fabric or a scattering prevention net.

  Furthermore, in the said embodiment, although the 1st hydrophilic nonwoven fabric 8A, the 2nd hydrophilic nonwoven fabric 8B, and the 3rd hydrophilic nonwoven fabric 8C are used as the hydrophilic nonwoven fabric 8, 2nd hydrophilic nonwoven fabric 8B and 3rd hydrophilic nonwoven fabric are used. At least one of the conductive nonwoven fabric 8C may be omitted. Moreover, as shown in FIG. 3, it is preferable that the 1st hydrophilic nonwoven fabric 8A, the 2nd hydrophilic nonwoven fabric 8B, and the 3rd hydrophilic nonwoven fabric 8C are integrated. In this case, the 1st hydrophilic nonwoven fabric 8A, the 2nd hydrophilic nonwoven fabric 8B, and the 3rd hydrophilic nonwoven fabric 8C will be connected continuously, and the clearance gap between the hydrophilic nonwoven fabrics 8 can be eliminated. Therefore, it becomes possible to collect the waste coating film 10 more firmly.

  Moreover, in the said embodiment, although the fence 7 is embedded in the ground 4, the fence 7 is not necessarily required and can be abbreviate | omitted. Furthermore, instead of the fence 7, as shown in FIG. 4, a scaffold 12 incorporated with a single pipe may be embedded in the ground 4. In this case, the scaffold 12 may be provided with a scattering prevention net 13, and in this case, the third hydrophilic nonwoven fabric 8 </ b> C covers only a portion of the scaffold 12 that is not covered by the scattering prevention net 13. It only has to be laid. However, if the scattering prevention net 13 is not provided on the scaffold 12, the third hydrophilic nonwoven fabric 8 </ b> C is preferably laid so as to cover the entire scaffold 12. Furthermore, in the said embodiment, although an operator is arrange | positioned on 8 A of 1st hydrophilic nonwoven fabrics, the operator should just be arrange | positioned ahead of the base material 2. FIG. Therefore, for example, the worker may be disposed on the ground 4 opposite to the first hydrophilic nonwoven fabric 8 </ b> A with respect to the fence 7.

  Furthermore, in the said embodiment, although the target object of a coating-film removal is the outer wall material 1, the side wall which comprises a veranda may be sufficient as the target object of a coating-film removal. In particular, when the floor of the veranda is made of slats, etc., when the paint film inside the side wall is peeled off with water, the paint film passes through the gap between the slats, so the paint film is recovered. It becomes difficult. Therefore, this invention is useful also when removing the coating film of the side wall of a veranda. In this case, the first hydrophilic coating film 8A may be laid on a floor surface such as a snowboard.

  Hereinafter, the content of the present invention will be described more specifically with reference to examples and comparative examples, but the present invention is not limited to the following examples.

Nonwoven fabrics used in Examples and Comparative Examples are as shown in Table 1. In Table 1, “water absorption time” is a parameter serving as an index of hydrophilicity, and the smaller the value, the higher the hydrophilicity. “Water absorption time” refers to a value measured in accordance with 7.1.1 of JIS L 1907: 2010. Furthermore, in Table 1, the nonwoven fabrics 1-3 are used by an Example, and the nonwoven fabric 4 is used by a comparative example.

Example 1
On the gravel surface, an outer wall material with a height of 1.8 m and a width of 0.9 m, in which an acrylic silicon-based resin coating film with a deteriorated surface is coated on a base material made of a ceramic siding material, is installed vertically. Underneath, a concrete block with a height of 190 mm was placed to prepare a simulated house wall.

  On the other hand, a rectangular nonwoven fabric 1 (hereinafter referred to as “nonwoven fabric 1A” in the examples) having dimensions of long side 0.9 m × short side 0.5 m × thickness 0.3 mm was prepared.

  Next, this non-woven fabric 1A was laid in a flat shape so as to cover the gravel surface up to 0.5 m ahead of the base material as a first hydrophilic non-woven fabric. At this time, 1 A of nonwoven fabrics were laid so that the front-end | tip may be arrange | positioned just under a base material, and a long side is arrange | positioned in parallel with the base-material surface.

  Then, using a high-pressure washer, high-pressure water was sprayed for 30 seconds under the conditions of a water amount of 12 L / min and a water pressure of 10 MPa with respect to the coating film of the outer wall material, and the coating film was peeled off.

  As a result, some waste paint was scattered on the surface of the concrete block where the nonwoven fabric was not laid and the gravel surface 0.5 m or more ahead from the base material where the nonwoven fabric was not laid. However, a lot of peeled waste coating films were caught on the surface of the nonwoven fabric 1A laid on the gravel surface, and the waste coating films could be easily collected.

(Example 2)
A rectangular non-woven fabric 1 (hereinafter referred to as “non-woven fabric 1B” in the present example) having dimensions of a long side of 0.9 m, a short side of 0.19 m and a thickness of 0.3 mm is further prepared. 2 As a hydrophilic non-woven fabric, the coating film was peeled off from the base material in the same manner as in Example 1 except that it was laid so as to cover the portion immediately below the base material to the base of the concrete block, that is, the surface of the concrete block. .

  As a result, some waste coating film was scattered on the gravel surface 0.5 m or more ahead from the base material on which the nonwoven fabric was not laid. However, the waste coating film was caught on the surfaces of the nonwoven fabric 1A laid on the gravel surface and the nonwoven fabric 1B laid so as to cover the surface of the concrete block, and it was easy to collect the waste coating film for each nonwoven fabric.

(Example 3)
The coating film was peeled from the outer wall material in the same manner as in Example 2 except that the nonwoven fabric 1A was replaced with the nonwoven fabric 2 without changing the dimensions.

  As a result, some waste coating film was scattered on the gravel surface of 0.5 m or more ahead from the base material on which the nonwoven fabric 2 was not laid. However, the waste coating film was caught on the surface of the nonwoven fabric 2 laid on the gravel surface and the nonwoven fabric 2 laid so as to cover the surface of the concrete block, and the recovery of the waste coating film for each nonwoven fabric was easy.

Example 4
A simulated house wall was prepared on the gravel surface in the same manner as in Example 1. In addition, a 0.5 m high fence assembled with a single pipe pipe was installed in the front 0.5 m portion of the substrate.

  Meanwhile, two nonwoven fabrics 1A were prepared and one nonwoven fabric 1B was prepared. Then, one of the two nonwoven fabrics 1A is used as a first hydrophilic nonwoven fabric, and the whole is laid flat so as to cover the gravel surface up to 0.5 m ahead of the base material, and the other one is The third hydrophilic nonwoven fabric was laid so as to cover the fence. Furthermore, the non-woven fabric 1B was laid as a second hydrophilic non-woven fabric so as to cover the portion from directly under the base material to the concrete block base, that is, the surface of the concrete block. At this time, both the nonwoven fabric 1A and the nonwoven fabric 1B were arranged so that their long sides were parallel to the substrate surface.

  Thereafter, in the same manner as in Example 1, high-pressure water was sprayed onto the coating film of the outer wall material to peel the coating film from the substrate.

  As a result, the waste paint film was slightly scattered on the gravel surface behind the single pipe. However, the waste coating film is caught on the surface of the nonwoven fabric 1A laid on the gravel surface, the nonwoven fabric 1B laid on the surface of the concrete block, and the nonwoven fabric 1A laid so as to cover the lower end to the upper end of the single-pipe pipe fence. It was easy to recover the waste coating film.

(Example 5)
A simulated house wall was prepared on the gravel surface in the same manner as in Example 1. Furthermore, a scaffold having a height of 3.0 m assembled with a single pipe pipe was installed in a 0.5 m portion in front of the base material. Here, an anti-scattering net was installed above the scaffold. The anti-scattering net was installed so as to cover a range of 2.5 m downward from the upper end of the scaffold.

  On the other hand, two rectangular non-woven fabrics 3 (hereinafter referred to as “non-woven fabric 3A” in the examples) having dimensions of 0.9 m long side × 0.5 m short side × 0.4 mm thickness are prepared. One rectangular nonwoven fabric 3 (hereinafter referred to as “nonwoven fabric 3B” in the examples) having dimensions of 0.9 m × short side 0.5 m × thickness 0.4 mm was prepared. Then, one of the two nonwoven fabrics 3A is used as the first hydrophilic nonwoven fabric, and the whole is laid flat so as to cover the gravel surface up to 0.5 m ahead of the base material, and the other one is As a 3rd hydrophilic nonwoven fabric, it laid so that the part from a gravel surface to the lower end of a scattering prevention net of a scaffold might be covered. Further, the non-woven fabric 3B was laid as a second hydrophilic non-woven fabric so as to cover the portion from directly under the base material to the concrete block base, that is, the surface of the concrete block. At this time, both the nonwoven fabric 3A and the nonwoven fabric 3B were arranged so that their long sides were parallel to the substrate surface.

  Thereafter, in the same manner as in Example 1, high-pressure water was sprayed onto the coating film of the outer wall material to peel the coating film from the substrate.

  As a result, the waste coating film is formed on the surface of the nonwoven fabric 3A laid on the gravel surface, the nonwoven fabric 3B laid on the surface of the concrete block, and the nonwoven fabric 3A laid so as to cover the portion from the gravel surface to the lower end of the anti-scattering net of the scaffold. The waste coating film for each non-woven fabric was easily recovered. In addition, a slight amount of waste coating adhered to the anti-scattering net, but no scattering of the waste coating was observed on the gravel surface and other parts.

(Comparative Example 1)
The coating film was peeled from the substrate in the same manner as in Example 1 except that the nonwoven fabric 1A was not laid on the gravel surface.

  As a result, the waste paint film scattered on the concrete block surface was stuck and cleaned with a brush. In addition, the waste coating film scattered on the gravel surface entered the gravel gap and could not be recovered.

(Comparative Example 2)
The coating film was peeled from the substrate in the same manner as in Example 1 except that the nonwoven fabric 1A was replaced with the nonwoven fabric 4 without changing the dimensions.

  As a result, on the non-woven fabric 4 laid on the gravel surface, the water from which the coating film has been peeled flows along with the waste coating film, and the waste coating film that has flowed into the gravel surface together with water enters the gravel gap and cannot be recovered. Met.

(Comparative Example 3)
The coating film was coated in the same manner as in Example 4 except that the nonwoven fabric 1A and the nonwoven fabric 1B were replaced with the nonwoven fabric 4 (hereinafter referred to as “nonwoven fabric 4A” and “nonwoven fabric 4B”, respectively) without changing the dimensions. It was made to peel more.

  As a result, the water from which the coating film was peeled was collected on the nonwoven fabric 4A together with the waste coating film, which hindered work. Further, the collected water and waste coating film were tried to be collected together with the nonwoven fabric 4A, but the collected water flowed out together with the waste coating film and could not be collected. In addition, the waste coating film that flowed out with water entered the gravel gap and could not be recovered.

  From the above results, it was confirmed that the coating film removing method can efficiently perform the coating film removing operation.

DESCRIPTION OF SYMBOLS 1 ... Outer wall material 2 ... Base material 3 ... Paint film 4 ... Ground 8 ... Hydrophilic nonwoven fabric 8A ... 1st hydrophilic nonwoven fabric 8B ... 2nd hydrophilic nonwoven fabric 8C ... 3rd hydrophilic nonwoven fabric 10 ... Waste coating film 11 ... Water

Claims (3)

In the coating film removing method for removing the coating film by peeling the coating film coated on the substrate from the substrate using water and collecting the peeled coating film,
The method of removing a coating film, comprising collecting the coating film peeled off from the substrate using a first hydrophilic nonwoven fabric laid on the ground or floor surface in front of the substrate.   The second hydrophilic nonwoven fabric laid so as to connect the base material and the end portion on the base material side of the first hydrophilic nonwoven fabric is further used for collecting the coating film peeled from the base material. The coating film removing method according to claim 1, wherein the coating film removing method is performed.   The collection of the coating film peeled from the base material is further performed using a third hydrophilic nonwoven fabric laid so as to rise from the end opposite to the base material in the first hydrophilic nonwoven fabric. The method for removing a coating film according to claim 1 or 2, characterized in that:

Images