JP2005161286A - Color material-containing film peeling system using high pressure water - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a peeling technique system using a "water jet system" having no adverse effect on a peeled base layer when peeling off a color material-containing coating film and a primary coating film from the base layer by high pressure water jet treatment. <P>SOLUTION: This color material-containing film peeling system using the water jet system includes processes for: performing test jetting in advance for evaluating the peeling off of the surface to be treated depending on the jetting conditions; jetting high pressure water from a jetting nozzle against the surface to be treated having at least a film having a color material, a rust-preventing film and/or a primary coating film and peeling off these films from the surface; recovering broken peeled off pieces of the films and water; separating solid containing recovered broken pieces of films from water; and reusing and/or discharging the water obtained by subjecting the separated water to post treatment including at least pH adjustment and solid-water separation. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a processing system using a water jet peeling method using high-pressure jet water, and in particular, an error associated with a peeling operation can be minimized with respect to a state after peeling suitable for repainting. The present invention relates to a treatment system using a water jet peeling method which has little adverse effect on the environment including solid content and water reuse and final treatment and is excellent in cost.

The surface of concrete structures such as buildings and bridge piers needs to be repaired because cracks and deterioration progress to the inside of the concrete due to secular change, salt damage, neutralization, etc. Conventionally, for example, shot materials (hard fine particles) ), The deteriorated portion is peeled off (hanged) with a breaker or the like, and the peeled surface is washed and then applied with mortar or the like. Moreover, since deterioration progresses also in the painted surfaces, such as a building and a bridge pier, it repainted after performing the peeling process of a coating agent by the processing method similar to the above.
When the base layer of the surface to be peeled is a thin metal plate, particularly when the paint film is peeled off and repainted, peeling and repainting using a technique such as a grinder has been performed.

  However, considering the influence on the work environment and surrounding environment such as noise, vibration, or dust due to peeling using a technique such as the above grinder or peeling work with a breaker, etc. In recent years, the use of ultra-high-pressure jet water (so-called “water jet method”) improves the adhesion of repair mortar or paint when an optimum treatment surface is formed by removing the pulverized powder by washing with water. The technology that was used is being used a lot.

Numerous proposals have been made for the peeling technology using these “water jet methods” in concrete buildings and roads. It has also been proposed for bridge piers and painted surfaces of buildings.
However, even in the peeling technology using these “water jet methods” that possess excellent elements, when the base layer of the surface to be peeled is a thin metal plate, particularly when the paint film on the body part is peeled off and repainted In most cases, no consideration was given to the damage to the base metal plate, and the emphasis was placed on the efficiency of peeling, and lack of consideration for damage to the base layer. In fact, a sufficiently satisfactory system has not been established in the treatment of so-called post-peeling wastewater containing water. In the treatment of waste water after peeling, there were problems in preventing the dispersion of treated water to the surroundings, considering the environment of the waste water, and treating the separated solid matter.

Proposals have also been made to solve the problems of the peeling technology using these “water jet methods”. For example, a large-sized bottomed box body that can be held by a person is equipped with a spray nozzle, sprays high-pressure water onto the surface to be treated, and uses a method of sucking and collecting the separated wastewater with an external suction device. Proposals have been made with the aim of improving the workability by preventing the cost from rising due to the equipment. (See Patent Document 1)

    JP 2003-94394 A

Problems to be solved by the invention

  These conventionally proposed technologies are mostly for concrete buildings and roads, so they are peeling technologies using the “water jet method” that have the same purpose in terms of surface peeling. In most cases, the solid material to be peeled and the treated surface remaining after peeling are substantially the same material that is not strictly distinguished from the base layer. Therefore, the wave and damage caused by the high pressure water jet of the base layer were hardly considered. Further, most of the treatments for the surface solids to be peeled are not taken into consideration.

Means for solving the problem

  The inventor of the present application pays attention to such a problem, and when the surface layer having at least a coating material having a colorant and an undercoat coating film is peeled and removed from a base layer made of a metal plate or the like by high-pressure water jetting, It is a peeling technology system that uses the “water jet method” that does not adversely affect the environment by separating at least the paint film with the colorant and the undercoat film from the waste water into a concrete product or plastic recycled product. We came to devise a separation technology system that uses the “water jet method” that does not cause waves or damage caused by high-pressure water injection, and the “water jet method” is suitable for specific objects to be processed, which can reduce overall work costs. The peeling technology system used is provided.

  That is, the present invention includes at least (1A) a step of performing test injection for evaluating peeling removal of the surface to be processed under the injection conditions in advance, (1B) high pressure water from the injection nozzle, and (1) a film having at least a coloring material. (2) A step of peeling and removing the film (1) having at least a coloring material and (2) the rust-preventing film and / or the undercoat film on the surface to be processed, which is sprayed onto the surface to be processed having the rust-preventing film and / or the undercoat film, (2) Step (1) for recovering the peeled and removed (1) film having at least the color material, (2) the peeled debris from the rust-preventing film and / or the undercoat film, and the sprayed water, (3) the recovered (1) (2) A step of separating solids and water containing peeled pieces of rust-preventing film and / or undercoat film and water, and (4) post-treatment including at least pH adjustment and solid-liquid separation. Water A process including recycling and / or draining; (5) a color material-containing film water jet system comprising (1) to (5) of the solid matter treatment process obtained by solid-liquid separation. A separation system, and a spray nozzle provided inside the high-pressure water spray nozzle within a range of 10 to 14 degrees (α in FIG. 4) with respect to the surface to be peeled. The above-described color material-containing film water jet type peeling system to be used, and the above-mentioned color material-containing film water jet type peeling system in which the solid waste treatment process is limited to the same surface to be processed and / or the same color tone. In addition, the color material-containing film water jet separation system, in which the base material on the surface to be processed is a metal material, and the vehicle body in which the base material on the surface to be processed is a metal material It is the said color material containing film | membrane water jet system peeling system which is.

The invention's effect

  A step of performing test injection in advance of the present invention for at least (1A) an evaluation of peeling removal of the surface to be treated under the injection conditions, (1B) a high-pressure water jet peeling removal step, (2) a step of collecting fragments and water, (3) Separation process of debris and water, (4) Reuse or drainage process of water, (5) Color material-containing membrane water jet system using high pressure water including a debris solids treatment process obtained by solid-liquid separation It has been found that the peeling system can suppress damage to the base layer due to peeling and removal of the surface layer, and can reduce pollution to the environment as much as possible. It is industrially useful in a water jet type peeling system for a surface to be processed having a coating film having an undercoat and an undercoat coating film.

The process of the coloring material containing film | membrane water jet system peeling system of this invention was shown in FIG. The present invention includes the following steps.
(1A) A process including performing test injection for evaluating peeling removal of the surface to be processed under the injection conditions in advance (in the figure, referred to as a test injection process, hereinafter abbreviated as “test injection process”) is an injection. This is a process to evaluate the removal and removal of the surface to be processed depending on the conditions, and prior to the entire surface of the removal and removal, using a separate object to be processed in a small area of the implementation surface or in the same state , When changing the injection conditions of the high-pressure water, that is, the type of injection nozzle, the injection pressure, the injection amount, etc., and (1) peeling at least the film having the color material and (2) the rust-preventing film and / or the undercoat film. Peeling state such as the size of the removed debris (1) peeled debris mainly composed of at least a coloring material and 2 antirust film and / or undercoat film, and wavy and painfulness of the base layer after delamination Damaged Evaluates the like and peeling of completeness, it determines the injection conditions that meet the previously requested properties after peeling was, is intended for carrying out the actual entire peeled off. The implementation of this (1A) test injection process is particularly necessary in the removal of the coating when the base layer of a railway vehicle or the like removes the coating film from the vehicle body which is a metal plate and “repaints”, and the base layer is thin. It is necessary to carefully evaluate the conditions under which such a situation does not occur. .

A "pretreatment step such as a cleaning step" may be included before this (1A) test injection step or before the following (1B) high-pressure water injection peeling removal step.
(1B) High-pressure water is sprayed from an injection nozzle onto a surface to be processed having (1) a film having at least a color material and (2) a rust-preventing film and / or an undercoat film, and (1) at least a color material on the surface to be processed (2) Releasing and removing the rust-preventing film and / or the undercoat film (represented as a high-pressure water jet peeling / removing step in the figure, hereinafter abbreviated as “high-pressure water jet peeling / removing step”)
(2) A step of recovering the peeled and removed film (1) having at least a coloring material, and (2) a fragment of the rust-preventing film and / or the undercoat film and sprayed water (in the figure, a step of collecting the fragment and water) (Hereafter, abbreviated as “recovery step of debris and water”)
(3) The step of separating the recovered solids containing the recovered film (1) at least the coloring material and (2) the rust-preventing film and / or the undercoat film and water (in the figure, the process of separating the fragments and water) (Hereinafter abbreviated as “separation process of debris and water”)
(4) Processes that include post-treatment including at least pH adjustment and solid-liquid separation, and recycling and / or draining the water obtained (represented as water reuse or drainage process in the figure, (Abbreviated as “water reuse or drainage process”)
(5) Debris solid treatment process obtained by solid-liquid separation (in the figure, it is represented as debris solid treatment process, hereinafter abbreviated as “debris solid treatment process”)
It is desirable that the separated solid content including (1) a film having at least a color material and (2) a rust-preventing film and / or an undercoat film fragment be treated in accordance with an industrial waste treatment method or the like. Other aggregates and water may be mixed to form a cement solid, or may be used by mixing with a plastic material as a filler or a coloring material. This is limited to the surface to be processed and / or the same color tone, and this makes it possible to obtain a solid solid product having the same color tone, which is advantageous for subsequent reuse.

In the (1A) test spraying step and / or (1B) high-pressure water jet peeling removal step, (1) the surface layer of the surface to be treated having at least a color material film and (2) a rust-preventing film and / or undercoat film, Color materials such as pigments and organic dyes are mixed with a vehicle such as a polymer and other fillers and preservatives added as necessary to form a coating material and form a coating film. (2) Rust-preventive film and / or undercoat film is a rust-preventive film that is coated with a known rust-preventive agent to prevent metal corrosion when forming a paint film on a metal base layer as it is or with a vehicle such as a polymer. The film is formed, and the undercoat film is used for flattening the surface unevenness of the base layer or for improving the adhesion between the base layer and the film having at least the coloring material, etc. A coating material as a coating material by appropriately selecting and mixing a hydrophilicity imparting agent or a hydrophobicity imparting agent for improving adhesiveness with a white colorant or a film having a colorant mainly concealing a filler or a base color Formed.
In the present invention, the surface layer of the surface to be treated is a gloss film, a protective film or a color material formed on a part in addition to (1) the film having at least the color material and (2) the rust preventive film and / or the undercoat film. It may include a pattern such as or a label such as a letter or paper.
The base layer on the surface to be treated of the present invention is not particularly limited and is a metal, wood, concrete, or the like, but is preferably a metal and a metal plate having a thickness of about 10 mm at most. Examples of the metal include iron, iron-based iron alloys, single metals of aluminum, copper, and titanium, or alloys thereof.

The injection nozzle and method used in the present invention are not particularly limited as long as they are used in a conventionally known water jet separation system, and a water supply tank, an ultra-high pressure water generator, etc. are provided for the purpose of separation and removal. In consideration of the type of the surface to be treated, the surrounding environmental conditions, the economy, etc., the surface to be treated, its coating film, and the surface requirement of the base layer after peeling may be appropriately selected and used.
Examples of the injection nozzle and method used in the present invention include a fan-type nozzle method, a rotationally oscillating multi-hole nozzle method, and a rotary nozzle method. The pressure of high-pressure water is appropriately selected from a pressure of about 15 MPa to 250 MPa. Can be used.
Moreover, in these injection methods, there are a nozzle moving type that can be operated while being carried by an operator, or a nozzle moving device type that is a large-sized device in which the injection nozzle can be mechanically operated. it can.
The high-pressure water jet nozzle in the present invention is used, for example, in a rod-like body. In general, the nozzles are used in a number of about 4 to 9 arranged on the same circumference.
In the high-pressure water jet peeling when the base layer is a thin metal plate as a preferred embodiment of the present invention, more than half of the total number of nozzles of the nozzle, more preferably 75% or more of the total number of nozzles, are on the surface to be peeled. On the other hand, it is preferably arranged so as to open outwardly in the range of 10 to 14 degrees from the vertical line (α in FIG. 4), and opens to a horizontal plane parallel to the surface to be peeled (α in FIG. 4). ) Is less than 10 degrees, it tends to cause damage to the metal plate that is the base layer of the surface to be peeled, and when it exceeds 14 degrees, the surface layer of the surface to be peeled is peeled off. It becomes very slow when the high-pressure water pressure and water volume are the same.

(2) In the step of collecting fragments and water, the recovery method is not particularly limited as long as it is used in a known water jet separation system, and the spray water and separation fragments disposed in the vicinity of the high-pressure water injection nozzle. That can be removed and collected continuously by gravity or suction from an external suction part from a suction port or drainage port provided in a box or bowl-shaped body that accepts air and prevents scattering The drainage receiving body that can receive the entire surface may be received and collected only by gravity.
(3) In the separation process of crushed pieces and water, the separation method is not particularly limited as long as it is used in a known water jet separation system, but pH adjustment is essential in this step, and before and after the separation. Alternatively, the pH may be adjusted at the same time. For this pH adjustment, carbon dioxide, dilute sulfuric acid, or dilute alkali is selectively used. In the separation, known individual liquid separation methods such as sedimentation, gravity filtration, centrifugal filtration, and foam separation can be used, and the separated solid fragments can be dried as necessary.

In the step (3), the separated debris is disposed of to meet environmental standards in accordance with the Industrial Waste Disposal Law, etc., or mixed with cement and other aggregates and dried to produce a cement product. It can also be used as a filler or colorant in plastic materials, but it can be used without drying or semi-dry depending on the mixing conditions of this fragment with cement, etc. Efficient use is possible both thermally and productively.
In addition, the separated water is drained after being adjusted to meet environmental standards in (4) “Reuse or drainage process” of water, or used for pre-cleaning water and other irrigation water for non-treated surfaces Or recycled as high-pressure jetted water, or as mixed water in the case of cement solids, and can be used efficiently by circulating and reusing water. Fine solids that are difficult to handle in liquid separation and other processes can also be mixed and used in cement.
The present invention constituted by these series of steps can establish a highly efficient water jet separation system.

  Below, the specific Example of the water jet system peeling system of this invention is described. In the present embodiment, the surface to be treated is described as a vehicle body exterior coating surface of a railway vehicle, but the present invention is not limited to this.

The construction method using the water jet separation system of the embodiment is shown in FIGS.
1 and FIG. Is the repainted body of the Z railway company that is the surface to be treated. Is the green part at the bottom of the car body. Is the brown part at the top of the car body. Is a window part of a vehicle body.
2. Is 4. And 5. 2 shows a portion where a surface layer such as a coating film containing the coloring material has been peeled off by the high-pressure water jet nozzle in FIG.
The high pressure water jet nozzle body is 6. And 7. Is a suction port provided in a rod-shaped body that receives the spray water and exfoliated debris arranged in the vicinity of the nozzle and prevents scattering to the surroundings. A brush is disposed at the tip of the rod-shaped body that receives the spray water and exfoliated debris disposed as an exterior of the high-pressure water spray nozzle and prevents scattering to the surroundings.

When a car body that needs to be repainted with a steel plate as a base layer and a surface layer containing a coating film containing mainly each color material is peeled off by a water jet peeling system, a work scaffold is built around the car body, 5. High-pressure water spray nozzle body equipped in the body While the operator (gun nozzle man) is holding and moving while the open port is in contact with the vehicle body that is the surface to be treated, ultra-high pressure water supplied from the outside through the supply hose is disposed in the rod-shaped body. It is carried out by spraying from the installed spray nozzle onto the vehicle body that is the surface to be processed.
First, as a process, a part which is a surface to be processed (peeled) of the vehicle body 2. And 4. The pre-cleaning was performed on this part.
Thereafter, (1A) a test injection step was performed. In this process, high-pressure water is generated by a high-pressure water generator provided elsewhere, and is provided at the center with six nozzles on the same circumference provided at a 12-degree opening from the vertical line to the surface to be treated through a supply hose. Is supplied to a high-pressure water jet nozzle body having a nozzle of 0 degree open (almost perpendicular to the surface to be treated), the pressure of the high-pressure water is 15 to 250 MPa, and the flow rate of the high-pressure water is 3 l. / M. To 25 l / m. The peel pressure test was performed in a very small range of the surface to be treated (peeled) by varying the range, and the optimum pressure and flow rate at each part were determined by evaluating the degree of peeling of the surface layer and the degree of damage of the base layer.

  Next, (1B) the high pressure water jet peeling removal step is performed for each color. And 5. Separately. In this step, first, 4. Performed at the optimum pressure and flow rate obtained in the step (1A) only at the site, and from the recovery suction body provided elsewhere to the decompression site that led to the suction port provided in the high-pressure water jet nozzle body with the suction hose, The jetted high-pressure water is sucked together with the peeled surface layer and guided to the recovery suction body. Those containing water and debris led to this suction recovery body are first filtered and separated into solids mainly composed of debris and filtered water. The debris obtained here is 4. Only the surface debris forming the part and the color was almost green. The amount until the removal and removal of all the parts is completed is collected, dried as it is or if necessary, mixed with concrete or plastic, or disposed as waste plastic.

The filtered water is once stored in the recovered water storage tank and subjected to post-treatment.
Then 5. Implemented at the optimum pressure and flow rate obtained in step (1A) only at the site, and from the decompression / recovery suction body provided elsewhere to the suction site provided in the high-pressure water jet nozzle body by the suction hose The jetted high-pressure water is sucked together with the peeled surface layer and guided to the recovery suction body. Those containing water and debris led to this suction recovery body are first filtered and separated into solids mainly composed of debris and filtered water. The debris obtained here is 5. Only the surface debris forming the site and the color was almost brown. The amount until the removal and removal of all the parts is completed is collected, dried as it is or if necessary, mixed with concrete or plastic, or disposed as waste plastic.
In this way, even if it is the surface to be processed that is the same car body, it is appropriate depending on the difference in the degree of adhesion between the surface layer and the base layer on the treated surface by separately separating the parts with different hues and separately treating the solid fragments Peeling and removal can be performed, and the obtained fragments are extremely efficient for use as a coloring material. The filtered water is once stored in the recovered water storage tank and subjected to post-treatment.
The surface of the base layer obtained above was free from damage with no peeling residue suitable for repainting.

The treatment of the water stored at one end in the recovered water storage tank is carried out by adding the flocculant and the like while stirring the stirrer provided in the tank, and then using a solid-liquid separation means such as a centrifuge and a filter. It is separated into finely separated solids, pH is adjusted with dilute sulfuric acid or dilute caustic soda, and the treated water is stored in a separate water storage tank.
The water storage tank temporarily stores treated water to be supplied to the high-pressure water generator, and may be a means for mixing the water recovered by the above-described post-treatment and the treated water at a predetermined ratio, and is a new water treatment. A water tank and the water storage tank may be separately provided, and water from each may be mixed and used.

The treated water that has been subjected to pH adjustment, etc., may be reused as high-pressure water by mixing with new water as described above, or may be drained according to the local drainage standards, Moreover, it may be used only for the preliminary cleaning or cleaning of the peeling site by itself.
In the water jet separation system configured as described above, the high-pressure water generator, the vacuum recovery suction body, the recovered water storage tank and the water storage tank in the separation process of debris and water are carried in and removed. In consideration of convenience, it may be installed in one or a plurality of transport vehicles, which increases mobility.

FIG. 1 shows a process outline of the water jet separation system of the present invention.

FIG. 2 shows an outline of an embodiment of the water jet type peeling system of the present invention.

FIG. 3 shows an outline of an embodiment of the water jet separation system of the present invention.

FIG. 4 shows an outline of nozzle opening in the high-pressure water jet nozzle body of the present invention.

Explanation of symbols

1: Train body 2 which is a surface to be processed 2: Part of the surface after the separation process 3: Window portion 4: Specific color part of the train body which is the surface to be processed 5: Other than the train body which is the surface to be processed Specific color part 6: High-pressure water spray nozzle body 7: High-pressure water spray nozzle body Suction port 8 provided in the bowl-shaped body: Vertical line (virtual) to the surface to be processed
9: High pressure water jet nozzle 10: Surface to be treated

Claims (5)

  At least (1A) a step of performing test injection for evaluating peeling removal of the surface to be processed under the injection conditions; (1B) high pressure water from the injection nozzle; (1) a film having at least a color material; and (2) a rust-preventing film And / or (1) peeling removal of the film having at least the color material and (2) the rust-preventing film and / or the undercoat film, which are sprayed onto the surface to be treated having an undercoat film. (1) a step of recovering the peeled debris from the film having at least a color material, and (2) a rust-preventing film and / or an undercoat film and sprayed water, and (3) the recovered (1) having at least a color material. (2) A post-treatment including at least a pH adjustment and a solid-liquid separation, and reusing the obtained water. To do Step (5) a coloring material-containing layer water jet stripping system comprising solid-liquid debris solids treatment process obtained by separation from the (1A) to (5), which comprises Bimatawa drainage.   2. The spray nozzle used in the high-pressure water spray nozzle body within a range of 10 to 14 degrees (a in FIG. 4) is outwardly open from the vertical line with respect to the surface to be peeled. Color material-containing film water jet peeling system.   The color material containing film | membrane water jet system peeling system of Claim 1 or 2 made by restricting a fragment solid substance process process to the same to-be-processed target surface and / or the same color tone.   The coloring material-containing film water jet separation system according to claim 1, wherein the substrate on the surface to be processed is a metal material.   5. The color material-containing film water jet separation system according to claim 1, wherein the substrate to be processed is a vehicle body made of a metal material.

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