JP2001050477A - Material and method for manufacturing separable protection film in sheath shape - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a separable protection film in a sheath shape by forming the sheath shaped protection film in a flocculated substance shape, and covering a protection surface like a cocoon. SOLUTION: In an end of a pipe line joining part 10 of a first pipe 12 and a second pipe 14, the first pipe 12 is provided with a flange 13, and a second pipe 14 is provided with a flange 15 on its joining end. Two flanges 13, 15 are tightly adhered by a screw bolt 16 and a nut 18. A surface for protecting is outer walls of the pipe 12 and 14, an outer annular part or cylinder jacket shaped flange surface 13 and 15, and outer surfaces of the bolt nut 16 and 18. The protection surface 20 is sealed in a sheath 22, the whole of the pipe line joining part 10 is tightly protected, some kinds of a cocoon is formed, and the projection and recessed parts of the surface 20 are covered by it. It is thus possible to prevent rust since water and air do not reach the surface 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a material for producing a sheath-like peelable (removable) protective coating according to the preamble of claim 1 and a sheath-like removable protection as described in the preamble of claim 4 The present invention relates to a method for producing a coating.

[0002]

2. Description of the Related Art In structural engineering and material processing engineering,
It is not possible to form a piece of equipment from a material that is highly resistant to damage. This is based on the fact that such materials cannot be used for manufacturing reasons or for processing or rigidity reasons or for price reasons. The damaging effects to which parts of the device are exposed are created by the environment as well as the materials processed in the device or used in conjunction with the function of the device.
Therefore, it is often necessary to provide adequate durable surface protection for surfaces exposed to such damaged environments. For this purpose, the following two methods are considered.

The first of these methods is to provide the surface to be protected with an adhesive coating in the form of an impregnated or lacquered coating. The application of the adhesive coating is performed by applying a suitable agent, generally a liquid or paste, to the surface to be protected,
For example, the drug is applied by brushing or spraying or dipping. This method is relatively quick and simple, and can protect not only relatively simple surfaces, for example, flat surfaces, but also relatively complicated surfaces. However, this method has very significant disadvantages. For example, it is almost impossible to remove the protective coating from the surface to be protected, especially from three-dimensional shaped surfaces,
It is either possible with very great expense. However, removal of the protective coating is often necessary. This is necessary, for example, if the coating is mechanically or chemically damaged, worn, or the protective parts are changed or repaired. In this case, it is generally not possible to apply another protective liquid locally by another coating method. This is because such coatings do not adhere to already existing or remaining coatings. Thus, it is necessary to remove the remaining protective coating before repainting, but it is generally costly. In many cases, the protective coating cannot be removed mechanically. Solvents must be used, but are expensive and have environmental problems. In addition, the peeled protective film becomes unnecessary and cannot be reused.

[0004] As a second method for forming a protective coating on a surface, a coating of a solid material is applied to the protective surface. If the protective surface has a simple three-dimensional shape, a panel-like object can be mounted by a mechanical fixing element or an adhesive. Flexible tapes are wrapped around complex surfaces, such as pipelines and especially in the case of flanges and teeth they use for screw connections. These tapes, e.g. cloth, are dipped in an impregnating agent obtained, for example, from crude petroleum products. For surfaces that are protected in this way, it is not very difficult to remove them or add on them as needed. However, a disadvantage of this method is that the application of the protective coating, ie winding around the pipeline, is very time consuming and cannot be performed mechanically. This problem is particularly difficult if the surface to be protected is irregular, for example having depressions or protrusions. Furthermore, the removed tape cannot be used again.

[0005] It is therefore an object of the present invention to provide a substance of the type mentioned at the outset, which avoids the above-mentioned disadvantages, whereby the complete protective coating obtained is not only applicable to any surface, but also a problem. It also provides a method for producing a sheath-like peelable protective coating that can be removed from its surface without any need and obtained from a novel material as needed.

According to the present invention, the above object is achieved by a novel substance according to the features of claim 1 and based on a novel method according to the features of claim 4.

[0007] The higher advantages of the substances according to the invention and according to the method according to the invention are described in the dependent claims 2-3 or 4-7.

According to the invention, the protective coating is formed by applying a suitable substance in liquid form to the surface to be protected. For this purpose, the substance is solid at room temperature, becomes liquid, is applied to the protective surface and then solidifies. Application in liquid form is easy and is particularly suitable for protective surfaces having complex three-dimensional shapes. However, the applied substance does not bond with the protective surface, and once cured, forms a sheath-like protective film (hereinafter referred to as "sheath" for short) in the form of an agglomerated substance, which protects the protective surface like mayu. cover. After curing, the sheathed material aggregates without cracking to form a sealing body, which has a high toughness. The sheath covers and conforms to the protective surface, but does not fuse with, so to speak, or burn on, even if there are dents and protrusions, and even if it responds to sudden changes. In many cases, the tear resistance of the sheath or aggregates of the material should be greater than the adhesion of the sheath on the surface to be protected. Thus, if necessary, the sheath can be easily removed from the protective surface, in whole or in large parts. In this method, no abrasive mechanical method (eg, polishing) or chemical method (eg, use of a solvent) is required. This avoids unnecessary damage to the surface when removing the sheath. Furthermore, the sheath is resilient and can move a little in relation to the protective surface, so that it is notable that the sheath does not break in the event of thermal or mechanical deformation. This results in a very long sheath life. This new method can be applied not only to flat surfaces, but also to any two-dimensional or three-dimensional surface with simple and repetitive aspects, as well as outer or inner surfaces. For example, in the case of pipelines, the outer sheath is used for damage to the outer pipe surface due to environmental attacks,
A pipe inner sheath protects the interior against damage by the particulates, liquids or gases carried thereby.

[0009] The application of the substance used to form the sheath is advantageously effected by spraying.

Generally, substances, ie, individual materials, are turned into a liquid state by heating and are supplied to form a sheath, and the use of a solvent is unnecessary.

Reusing a sheath that has been removed from a protective surface is extremely useful from both an economic and an ecological perspective. This can be done simply by reheating and reapplying the material making up the sheath. The material constituting the sheath is changed to a solid state and / or
Or it may be necessary to wash, ie wash or filter in the liquid state. It has the advantage that no new material is required, except for a small amount of material to be replenished, and that the sheath can be recycled, so there is no waste and no additional costs for disposal .

Depending on the nature of the material from which the sheath is made,
It depends on the particular purpose. In principle, the strength of the substance is greater than its adhesion to the protective surface. The protective surface, the surrounding environment or the chemical or mechanical influences applied to the sheath therefrom and the temperature at which the sheath is used must be considered in the selection of a suitable material. This material is particularly useful in that it withstands long-term use, especially in that it reversibly changes to a liquid state by heating and to a solid state by removing heat.

According to the invention, a sheath of this kind is particularly useful for pipelines and the connections of pipelines, for example those which are often present on oil drilling platforms. Such pipeline connections are at extreme risk of corrosion. Because even if you are out of seawater, the surrounding salty air and water are blown,
Even in seawater, it is exposed to the corrosive environment caused by the seawater itself. The screw connection area is particularly bimetallic rust.
corrosion). Because the threaded portion and the flange connected thereby have different electrochemical values, they are exposed to bipolar metal rust and the salty seawater constitutes its electrolyte. Bipolar metal rust is worse at higher salinity and temperature in seawater, but can be completely and permanently controlled by the method of the present invention.

It should be noted that the present invention can be used in all areas where surfaces must be protected from external influences, not just for use with pipeline sheaths and oil drilling platforms. Of course, the material forming the sheath must be selected to suit each environment.

The details and features of the present invention will be described in more detail with reference to the following embodiments and drawings.

FIG. 1 shows an example of a sheath obtained by the method of the present invention for protecting a pipe joint.

FIG. 2 is an enlarged view of a part of FIG.

FIG. 3 is a schematic view showing a typical example of the manufacture of a sheath.

FIG. 4 is a schematic view showing an example of a method for removing a sheath.

FIG. 1 shows a first pipe 12 and a second pipe 1
4 shows the pipeline junction 10 of FIG. At the end to be joined, the first pipe 12 has a flange 13 and the second pipe 12
Has a flange 15 at its connection end.
The two flanges 13 and 15 are hermetically bonded by screw bolts 16 and nuts 18. Thus, one surface to be protected is the outer wall of the pipes 12 and 14, the outer annular parts or flange surfaces 13 and 15 of the respective cylinder jacket and the outer surfaces of the bolt nuts 16 and 18. The protective surface 20 is enclosed in a sheath 22 to hermetically protect the entire pipeline joint 10 and form a kind of eyebrows, which conforms to the irregularities of the surface 20. As a result, water and air reaching the surface 20 do not reach, and rust can be prevented.

The element 11 of the pipeline joint 10 shown in FIG. 2 shows that the material constituting the sheath 22 fills the smallest cavity 19 in the surface 20 and any rust that has already formed is blocked. Have been. Further, the corrosion inhibitor deposited on surface 20 along with the material forming sheath 22 reaches pipeline joint 10.

Depending on the condition of the surface 20, it may be preferable to remove the sheath 22 before application, for example with a wire brush, or optionally provide a primer.

FIG. 3 schematically illustrates the application of a sheath 22 on the surface 20. For this purpose, the substance 21 is heated and liquefied in a heating container 30 and passes in a liquid state through a hose 32 to the spray gun 24, which moves relative to the surface 20 and Sprayed on. This deposits in the form of the sheath 22 to be formed,
In this way, the shape of the surface is precisely and closely adhered. The material 21, ie, each sheath 22, solidifies by cooling the surface, forming an agglomerate, for example, a shell or skin, without fusing or adhering to the surface 20 and baking. The sheath has a resilient structure and conforms without being destroyed by heat or pressure.

The sheath 22 needs to be replaced after some time. For example, this is the case where the sheath is rubbed or the pipeline joint 10 is plugged or replaced.
FIG. 4 shows the removal of the sheath 22. In this case, the sheath 22 will need to be drilled or cut a portion of its length unless such holes already exist and are the reason for replacing the sheath. . Then sheath 2
All or a large part of 2 is removed from surface 20.

The material of the sheath 22 removed from the surface is reused. For this purpose, after washing and filtration as required, it is reinserted into the heating container 30 where it is liquefied by heating and becomes sprayable.

As mentioned above, different materials can be used to form the protective coating. The following describes the properties of the material available as E170, which material is particularly suitable for pipelines, flanges, storage machines and machine parts as well as other atmospheric or galvanic corrosion. this is,
High-molecular-weight, solvent-free coating material. It can be stripped and reused.

This material has the following standard values: ASTM B117-97 3000 hours salt mist durability ASTM G62-87 Pinhole / Holiday test ASTM G62-87 dielectric value ASMG 53-96 Accelerated This material has a honey-like color, is translucent, but can be colored. The flash point is above 200 ° C.

As mentioned above, the substance has no solvent and does not contain volatile organic components or other harmful additives. Thus, 100% of the sprayable material forms a solid sheath coating.

The substance contains a suitable rust inhibitor and, after being applied, deposits between the protective surface and the sheath-like protective material.

[0030] The material may further comprise additives which allow it to be peeled off without reducing adhesion.

Furthermore, the additives have, for example, thermal stability properties.

The dielectric properties of the material prevent bipolar metal rust from forming between the sheath-like protective coating and the protective surface.

An appropriate film thickness is usually rust, and is 1.0 to 1.5.
mm / 40 mil, and 2.0 ~ 2.5mm / 80 with severe rust
~ 100 mils.

When spraying, the film thickness is 750-1000 μm.
m / 80-100 mils is possible with a single application.

The protective coating is dried in 1-2 minutes until touched,
The top coat can be sprayed in 5 to 10 minutes, dried sufficiently in 10 minutes, and handled normally.

If an appropriate primer is used, 30 to
After 60 minutes, a top coat can be spray painted.

The substance was released during the first packing in 36 months.
Can be kept at 0 ° C for 36 months. The holding temperature is as follows: Temperature 140 ° C / 284F ° Application (coating) temperature 170-175 ° C / 338-344F
° Maximum temperature 180 ° C / 212F ° Maximum substrate temperature 100 ° C / 212F ° or less is more preferable: treatment for removing at least a wire brush or paint particles. Generally, water or a primer coat is applied. If necessary, the metal itself is polished and primer-coated.

The above-mentioned substances have the following protective effects. By the individualization, the substance forms a sheath-like protective film, and the protective surface can be protected completely and without holes in a cocoon shape.

For other reasons, especially when the film is broken due to damage or intentional handling, a rust preventive prevents the progress of rust and provides temporary protection.

When the protective film is completely removed, the rust preventive is effective until the protective film is formed.

[Brief description of the drawings]

FIG. 1 shows an example of a sheath obtained by the method of the present invention for protecting a pipe joint.

FIG. 2 is an enlarged view of a part of FIG.

FIG. 3 is a schematic view showing a typical example of manufacturing a sheath.

FIG. 4 is a schematic view showing an example of a method for removing a sheath.

[Explanation of symbols]

 20: protective surface, 22: sheath-like protective film

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Arthur Heycox Malaysia 40,000 Selangor, Shah Alam, Hicom-Glenmary Industrial Park, Jalan Magistret You 1/26, No. 1, Sexien 1, inside the environment

Claims (7)

[Claims] 1. The surface (20) can be spray-coated and returns to a solid state after the spray-coating, when the solid state is reached, the substance forms a high-strength agglomerate without through-holes, Forming a sheath-like protective coating (22) that can change from a solid state to a liquid state, where the force is greater than the adhesion to the surface and the sheath-like protective coating can be removed as a whole or at least a large part from the surface (20). Among the possible substances, the substance liquefies upon application of heat and solidifies reversibly upon removal of heat, and the sheath-like protective coating (22) formed from such a substance has an outer surface, in particular a pipeline connection ( 11) and a material which forms a sheath-like protective coating, characterized in that it can protect the oil drilling platform, in particular by forming a cocoon containing the outer surface. 2. The substance according to claim 1, wherein said substance contains an additive, for example a rust inhibitor which deposits during solidification. 3. The substance according to claim 1, wherein said substance consists essentially of E170. 4. The material according to claim 1, wherein said material is brought into a liquid state by heating, applied in a liquid state to a surface to be protected and cooled to form an agglomerated sheath-like body. And, if necessary, the whole or at least a part of the protective film (22) is coated on the surface (20).
Forming a removable protective film (22) on the surface to be protected, characterized in that it is removed from the surface, returned to a liquid state by further heating and reapplied to the surface (20). 5. The method according to claim 4, wherein the material forming the sheath-like protective coating (22) is spray-coated on the surface (20). 6. washing the material before or after reheating;
The method according to claim 4 or 5, wherein the method is for example washed with water and / or filtered. 7. The material forming the sheath-like protective coating (22) is a rust inhibitor (24), which deposits on the surface after the material has been applied and remains on the surface (2) even after the material has been removed.
0) The method according to any one of claims 4 to 6, comprising a substance remaining thereon.