JP2015024367A - Coating peeling method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To more efficiently peel coating matter from coated matter that is a component member for a large-sized steel structure such as a bridge, a steel frame, an iron tower and a frame installed outdoors.SOLUTION: A coating peeling method for peeling coating matter 12 from coated matter 10 by applying a release agent 22 to the coated matter 10 includes a damage step of forming physical damage (a scratch 14) on the coating matter 12 formed on a surface of the coated matter 10, and a coating step of applying the release agent 22 to the coated matter 10 following the damage step.

Description

  The present invention relates to a paint peeling method, and more particularly to a coated article (hereinafter referred to as an object to be coated) suitable for use in bridges, steel frames, steel towers, frames and other large steel structures installed outdoors. The present invention relates to a paint peeling method capable of more efficiently peeling a coated material from an object to be coated by applying a coating peeling agent (hereinafter simply referred to as a peeling agent) to the coated material.

  In recent years, it is necessary to peel off old paints containing harmful substances such as lead and chromium on bridges, steel frames, steel towers, frames and other large steel structures that have been installed outdoors, and then reapply them with new paints that do not contain harmful substances. The nature is increasing.

  In such a case, the technology for removing the coated material from the material to be coated includes a technology for removing the painted material by grinding with a grinder, grinding with an abrasive, impact destruction with sandblasting, hammering damage with a hammer, etc. A technique for peeling a coated material from the object to be coated by applying a release agent to the material is known.

  For example, Patent Document 1 describes a method in which an abrasive is pressed against the surface of a coating film by a pressing surface of a pressure body, the coating film is crushed to form a crushed coating film, and then the abrasive and the crushed coating film are removed. ing.

  Patent Document 2 describes a method in which a stripping solution obtained by mixing an abrasive with a solvent is contained in a cloth, paper, or sponge, and the resin film is rubbed off.

  In Patent Document 3, the coating material is peeled off using a coating material release sheet in which a coating material release agent is impregnated into a sheet base material composed of a composite base material composed of a fiber assembly and an organic film base material. How to do is described.

  Further, in Patent Document 4, after applying a release agent to the painted surface and allowing to stand, the coating film swollen and softened by the penetration of the release agent is disturbed, and then left still, and then the penetration of the release agent. A method for removing the entire swollen / softened coating film is described.

  Patent Document 5 describes a method of measuring the elapsed time after applying the release agent and the atmospheric temperature of the coating film, and determining the timing of starting the coating film peeling operation based on an integral value of the elapsed time and the atmospheric temperature. Has been.

JP 2002-177876 A JP-A-6-277618 WO2006 / 013112 A1 (Patent No. 4921171) JP 2011-56333 A JP 2012-166143 A

  However, the paint stripping technology using the above stripping agent does not fully exhibit the intended stripping effect unless the stripper penetrates the coated material in advance, so the time required for stripping the coated material from the coated material. However, there is a problem that the amount of the coated material that can be peeled at a time is reduced. This problem becomes particularly prominent when the coated object is peeled off from an object to be coated in which many layers of the coated object are applied.

  This invention is made | formed in view of said subject, and makes it a subject to provide the technique which can peel a coating thing from a to-be-coated article more efficiently using a peeling agent.

  In order to solve the above-mentioned problem, the coating peeling method according to the first embodiment of the present invention is a coating peeling method for peeling a coated material from a coating object by applying a peeling agent to the coating material. A damage process for forming physical damage on the coated object formed on the surface of the object to be coated, and an application process for applying a release agent to the object to be coated subsequent to the damage process. To do.

  The paint peeling method which concerns on the 2nd form of this invention has the application | coating process which apply | coats a peeling agent to the said to-be-coated article before the said damage process.

  The paint peeling method which concerns on the 3rd form of this invention has the application | coating process which apply | coats a peeling agent to the said to-be-coated article in multiple times after the said damage process.

  The paint peeling method which concerns on the 4th form of this invention has the combination of the said damage process and application | coating process in multiple times.

  The paint peeling method according to the fifth aspect of the present invention is the paint peeling method according to any one of the first to fourth aspects, wherein the object to be coated with the release agent is disposed at a temperature higher than the ambient temperature. It has the heat retention process maintained at high temperature, It is characterized by the above-mentioned.

  A paint peeling method according to a sixth aspect of the present invention is the paint peeling method according to any one of the first to fifth aspects, wherein the physical damage is a scratch flaw.

  A paint peeling method according to a seventh aspect of the present invention is the paint peeling method according to any one of the first to sixth aspects, wherein the object to be coated includes a bridge, a steel frame, a steel tower, and a large frame. It is a structural member of a steel structure.

  According to the first aspect of the present invention, since physical damage is formed on the coated object existing on the surface of the object to be coated, the release agent easily penetrates into the coated object in a short time, and therefore The coated material can be more efficiently peeled from the coated material.

  In the second embodiment of the present invention, the coated material can be softened in advance by the release agent applied before the damage step, and physical damage can be easily caused in the subsequent damage step. Furthermore, it can be carried out efficiently or in a short time.

  According to the fifth aspect of the present invention, even when the ambient temperature is low and it takes a long time for the release agent to permeate the coating, the permeation can be promoted, and the coating to which the present invention is applied. The peeling operation can be performed more efficiently.

  In the sixth embodiment of the present invention, as physical damage, for example, (A) parallel or (B) lattice-shaped scratching ridges 14 are formed on the coated article 12 as illustrated in FIG. Scratches are one of the physical damages that are most easily formed on the object to be coated, and are more easily formed when the object is long or has a flat surface. Therefore, according to the 4th form of this invention, the paint peeling operation | work which applies this invention can be implemented more efficiently.

  In the seventh embodiment of the present invention, the object to be coated is a structural member of a bridge, a steel frame, a steel tower, a frame, or other large steel structure, so that it can reach the surface of the object by physical damage in the damage process. Even if damage occurs, the damage does not adversely affect the appearance and overall aesthetics of the large steel structure, or even very little.

  Some of the conventional paint peeling and removal techniques have a problem of removing a coated object so as not to cause wrinkles on the object to be coated (see Patent Documents 1 and 2). The fifth aspect of the present invention is in contrast to such prior art.

  Thus, according to the seventh aspect of the present invention, it is possible to carry out the paint stripping operation in a shorter time or more efficiently without worrying about the influence on the appearance and overall aesthetics of the object to be coated. In addition, with a large steel structure, when humans look at the entire view, even if physical damage marks such as striking marks and pruritic marks remain on the surface due to physical damage, the adverse effects on the appearance and overall aesthetics cannot be felt. A large steel structure.

The top view which shows the scratch flaw which is an example of the physical damage formed in the coating material in embodiment of this invention The flowchart which shows the process sequence in 1st Embodiment of this invention. The perspective view which similarly shows the example of the application process of a release agent A perspective view showing an example of a physical damage process Similarly, a cross-sectional view showing a state where the release agent has permeated Similarly, a cross-sectional view showing the peeling process of the paint The flowchart which shows the process sequence in 2nd Embodiment of this invention. The flowchart which shows the process sequence in 3rd Embodiment of this invention.

  Hereinafter, modes (hereinafter referred to as embodiments) for suitably carrying out the present invention will be described in detail. In addition, this invention is not limited by the content described in the following embodiment and an Example. In addition, constituent elements in the embodiments and examples described below include those that can be easily conceived by those skilled in the art, those that are substantially the same, and those in a so-called equivalent range. Furthermore, the constituent elements disclosed in the embodiments and examples described below may be appropriately combined or may be appropriately selected and used.

  Hereinafter, the processing procedure of the first embodiment of the present invention will be described with reference to FIG.

  First, in step 100, as illustrated in FIG. 3, the surface of an object to be coated (for example, a structural member of a large steel structure including a bridge, a steel frame, a steel tower, and a frame) 10 is formed with a brush 20, a roller, a spray, and the like. A release agent 22 is applied to the coated object 12. As the release agent 22, for example, one having a higher alcohol as a main component, one having an organic solvent as a main component, or an arbitrary one according to the coated object 12 can be used.

  Next, the process proceeds to step 110, and when the release agent 22 penetrates into the paint 12 to some extent and the paint 12 becomes soft, the paint 12 is physically damaged. As the physical damage, as shown in FIG. 4, a parallel or lattice-shaped scratching rod 14 as illustrated in FIG. 1 can be applied with a scraper 30 or the like. Here, the shape of the scratching bar 14 is not limited to a parallel or lattice shape.

  Next, the routine proceeds to step 120, where the release agent 22 is again applied to the article 12 to which the scratching rod 14 has been added by the same method as in FIG. The release agent 22 applied in step 120 may be the same as or different from the release agent 22 applied in step 100.

  Next, the routine proceeds to step 130, and as shown in FIG. 5, when the release agent 22 has sufficiently penetrated into the article 10 to be coated, the paint article 12 is peeled from the article 10 by the scraper 30 or the like as shown in FIG. To do. At this time, as shown in FIG. 5, even when the coated object 12 is heated / heated by the heater 40 and the atmosphere temperature is low and the penetration of the release agent 22 into the coated object 12 takes a long time, Penetration can be promoted.

  In this manner, by applying physical damage such as scratching flaws, the penetration of the release agent is promoted, and the release operation can be carried out more efficiently than before. In addition, the physical damage formed on the coated material is not limited to the scratched surface.

  In this embodiment, since the release agent is applied in step 100 before applying physical damage in step 110, the coating can be softened in advance, and physical damage is easily caused in the subsequent damage process. The stripping operation can be performed more efficiently or in a short time. Note that step 110 may be omitted depending on the coated object.

  Next, a second embodiment of the present invention will be described with reference to FIG.

  In this embodiment, first, after physically damaging the scratching flaw 14 or the like in step 200, in step 210 and step 220, the release agent 22 is applied and, for example, reapplied at intervals, and in step 230. The coated object 12 is peeled off.

  Depending on the combination of the article 10 and the article 12, the second embodiment may be more suitable than the first embodiment.

  Next, a third embodiment of the present invention will be described with reference to FIG.

  In the present embodiment, first, physical damage such as the scratching scissors 14 is applied in Step 300, then the release agent 22 is applied in Step 310, then physical damage is applied again in Step 320, and then the release agent is applied in Step 330. 22 is re-applied, and the coated object 12 is peeled off in step 340.

  According to the third embodiment, a strong paint can be peeled off.

  The present invention is suitable for application to structural members of large steel structures installed outdoors, such as bridges, steel frames, steel towers, frames, and the like, but the scope of application of the present invention is not limited to this, and indoors An installed object may be used.

DESCRIPTION OF SYMBOLS 10 ... Coated object 12 ... Painted object 14 ... Scratch 20 ... Brush 22 ... Release agent 30 ... Scraper 40 ... Heater

Claims (7)

By applying a release agent to the object to be coated, a paint peeling method for peeling the paint from the object to be coated,
A damage process that forms physical damage to the coating formed on the surface of the workpiece;
Subsequent to the damage step, an application step of applying a release agent to the article to be coated;
A paint peeling method characterized by comprising:   The coating peeling method according to claim 1, further comprising an application step of applying a release agent to the object to be coated before the damaging step.   The coating peeling method according to claim 1, further comprising an application step of applying a release agent to the article to be coated a plurality of times after the damage step.   The paint peeling method according to claim 1, wherein a combination of the damage process and the coating process is performed a plurality of times.   5. The coating peeling method according to claim 1, further comprising a heat-retaining step of maintaining the object to be coated with the release agent at a temperature higher than an atmospheric temperature.   The paint peeling method according to claim 1, wherein the physical damage is a scratch.   The paint peeling method according to any one of claims 1 to 6, wherein the object to be coated is a constituent member of a large steel structure including a bridge, a steel frame, a steel tower, and a frame.

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