JP5354870B2 - Anticorrosion coating and anticorrosion coating with protective cover having the same - Google Patents

Description

  The present invention relates to an anticorrosion coating material capable of ensuring excellent workability even when used for a flat anticorrosion object such as a steel sheet pile, and an anticorrosion coating material with a protective cover having the same.

  In recent years, various anticorrosion techniques for structural materials such as steel pipe piles, steel sheet piles, and marine platforms that constitute marine structures have been studied. As an anticorrosion method for offshore structures, electrocorrosion protection is generally applied in an environment in seawater and undersea sludge, and a covering material is generally applied in an environment above the tidal zone. A petrolatum lining method widely used as a coating method with a coating material is an anticorrosion system in which an anticorrosion tape or an anticorrosion sheet and an FRP (fiber reinforced resin) cover for protecting the anticorrosion tape or the anticorrosion sheet are combined.

  In Patent Document 1, as a method of applying a petrolatum lining method to a steel pipe pile that is a cylindrical structural material, a steel pipe pile and an anticorrosive material are protected by FRP after winding a tape-shaped anticorrosive material around the surface of the steel pipe pile. There has been proposed a method for adhering to each other. On the other hand, for example, when a petrolatum lining method is applied to a steel sheet pile that is a flat plate-like structural material, a tape-like anti-corrosive material cannot be wound around the flat plate-like structural material, so a sheet-like anti-corrosive material is pasted in advance. Generally, FRP is used. However, since petrolatum has very poor adhesion to FRP, the method of attaching the anticorrosive material and FRP tends to cause separation between the anticorrosive material and FRP, and is good for flat structural materials such as steel sheet piles. There was a problem that it was difficult to obtain a good workability.

  In Patent Document 2, in a joint portion of a steel sheet pile that is anticorrosive-coated with a resin coating, an anticorrosion sheet in which a soft resin sheet and a fiber sheet impregnated with a rust inhibitor are laminated so as to cover the outer surface of the joint portion. The steel is characterized by applying a pressing material of a specific shape from above the anticorrosion sheet, and striking the anticorrosion sheet so as to penetrate into the steel sheet pile from above the pressing material. A method of reinforcing the anticorrosion coating on the sheet pile joint has been proposed.

  In Patent Document 3, for the purpose of providing a method for coating and corrosion prevention of steel that can stably maintain the anticorrosion performance of the oil-based anticorrosion material for a long period of time, an anticorrosion layer made of an oil-based anticorrosion material is provided on the surface of the steel material, A method of coating and preventing corrosion of steel comprising protecting a layer with a plastic layer or a metal cover, wherein the outer surface of the plastic or metal cover is coated with a heat-shielding layer. Proposed.

  In the anticorrosion method using an oil-based anticorrosive material using petrolatum, etc., especially when installing in a high temperature environment in summer, fixing to prevent peeling unless the surface of the anticorrosive material and the cover provided outside it are good. Etc. are necessary, and workability deteriorates. However, the techniques of Patent Documents 2 and 3 do not improve the adhesion between the surface of the anticorrosive material itself and the cover, etc., and the anticorrosion coating material according to the prior art is used for a flat structural material such as a steel sheet pile. It is difficult to ensure good workability.

In order to improve the adhesion between the surface of the anticorrosive material and the FRP cover, a film layer made of a synthetic resin such as polyethylene or polypropylene is provided on the surface of the anticorrosive material, and an attempt is made to adhere this film layer and the cover via an adhesive. Has been made. In this case, although the adhesiveness between the film layer and the cover can be obtained, the petrolatum contained in the anticorrosive material also has a poor adhesiveness with the synthetic resin, so that the anticorrosive material surface and the film layer are peeled off. There is. For this problem, the present inventor uses a method of bonding the anticorrosive material surface and the film layer using an adhesive, or a synthetic resin film subjected to corona discharge treatment on the bonding surface side with the anticorrosive material. Although the method etc. were tried, all were not able to acquire sufficient adhesive force between the anticorrosive material surface and a film layer. As described above, it has been very difficult to attach the anticorrosive material and the FRP cover with sufficient adhesive force by the conventional technique.
Japanese Utility Model Publication No. 56-9703 JP 2000-1870 A JP 2004-137520 A

  The present invention solves the above-mentioned problems and ensures excellent workability even when the anticorrosion coating material and the cover do not peel at the time of construction and are used for a flat anticorrosion object such as a steel sheet pile, for example. An object of the present invention is to provide an anticorrosion coating material that can be used, and an anticorrosion coating material with a protective cover having the same.

  The present invention has at least an anticorrosion sheet layer and a film layer bonded to the anticorrosion sheet layer, the anticorrosion sheet layer is formed by impregnating a base material with at least petroleum wax, and the film layer is at least anticorrosion Provided is an anticorrosion coating material that is porous on a bonding surface with a sheet layer.

  In the anticorrosion coating material of the present invention, the film layer is a multilayer film having a base layer and a porous surface layer formed on one side or both sides of the base layer, and the base layer is non-porous or porous having independent pores. The porous surface layer is preferably made of a porous material having independent pores and / or continuous pores, and the film layer is preferably bonded to the anticorrosion sheet layer in the porous surface layer.

  In the anticorrosion coating material of the present invention, the petroleum wax is preferably composed mainly of petrolatum.

In the anticorrosion coating material of this invention, it is preferable that a base material consists of a nonwoven fabric.
The present invention also includes an anticorrosion coating material with a protective cover, which has at least the anticorrosion coating material according to any one of the above and a protective cover, and is formed by attaching the film layer side surface of the anticorrosion coating material to the protective cover. I will provide a.

  According to the present invention, the anticorrosion sheet layer and the film layer have good adhesion, and the film layer can be adhered to, for example, a cover via an adhesive, so that the anticorrosion sheet layer and the cover are excellent. Can be pasted on. For this reason, the anticorrosion coating | covering material which can ensure the outstanding workability also when using with respect to a flat anticorrosion target object like a steel sheet pile, for example, and an anticorrosion coating | covering material with a protective cover which has this are provided. It becomes possible.

  Hereinafter, exemplary embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited thereto. In addition, the location which attached | subjected the same referential mark in the figure means the site | part which has the same function, and description is not repeated.

  The anticorrosion coating material of the present invention has at least an anticorrosion sheet layer and a film layer bonded to the anticorrosion sheet layer. FIG. 1 is a cross-sectional view showing an example of the configuration of the anticorrosion coating material according to the present invention. In the anticorrosion coating material 100 shown in FIG. 1, a film layer 12 is bonded to one surface of the anticorrosion sheet layer 11. A release film 15 is provided on the other surface of the anticorrosion sheet layer 11. The release film 15 is a film such as polyethylene or polypropylene, and is peeled off when the anticorrosion coating material 100 is applied to a structural material such as a steel sheet pile.

[Anti-corrosion sheet layer]
The anticorrosion sheet layer used in the present invention is formed by impregnating a base material with at least petroleum wax. The petroleum wax used in the present invention typically means a hydrocarbon that exists in petroleum at room temperature and is solid. For detailed classification of petroleum wax, for example, JIS K-2235 can be referred to. The anticorrosion sheet layer impregnated with petroleum wax imparts excellent anticorrosion performance to the object to be coated that is coated with the anticorrosion coating material of the present invention.

  Typical petroleum waxes are petrolatum, paraffin wax, and microcrystalline wax. Here, petrolatum typically means a semi-solid wax separated and purified from vacuum distillation residue oil at room temperature, and paraffin wax typically represents a room temperature separated and purified from vacuum distillation distillate oil. The term “solid crystalline wax” means a wax that is solid at room temperature, which is typically separated and purified from vacuum distillation residue oil or heavy distillate oil.

  In the present invention, the petroleum wax is preferably composed mainly of petrolatum. Here, the main component means a component contained in an amount exceeding 50% by mass of the whole. Petrolatum is also referred to as amorphous wax, and is chemically inert, has a viscosity near room temperature, has good adhesion to the steel surface, has almost no moisture permeability, and has a characteristic of blocking oxygen. Therefore, when the petroleum wax used in the present invention is mainly composed of petrolatum, particularly excellent anticorrosion performance is imparted to the object to be coated.

  As the anticorrosion sheet layer, one in which the content of the petroleum wax with respect to 1 part by mass of the substrate is in the range of 1 to 10 parts by mass is preferable. When the content of the petroleum wax is set within this range, the anticorrosion performance is particularly good, and the adhesion between the anticorrosion sheet layer and the film layer is particularly good. When the content of petroleum wax with respect to 1 part by mass of the substrate is less than 1 part by mass, the anticorrosion performance and the tackiness may be inferior. On the other hand, when the content of petroleum wax with respect to 1 part by mass of the base material is more than 10 parts by mass, the anticorrosion performance and the tackiness are hardly improved, but the cost tends to increase.

  As the base material, for example, natural fibers such as cotton and hemp, non-woven fabrics and woven fabrics made of chemical fibers such as polyester and nylon can be preferably used, and components such as petroleum wax can be satisfactorily impregnated. And nonwoven fabrics are particularly preferred.

  In addition, petroleum wax can be made into the composition which mix | blended conventionally well-known rust preventives, a filler, an adhesive, etc. suitably as another component in the range which does not impair the effect of this invention. Further, the anticorrosion sheet layer formed in the present invention may be composed of an anticorrosion tape containing an adhesive.

[Film layer]
The film layer formed in the anticorrosion coating material of the present invention may be porous at least on the bonding surface with the anticorrosion sheet layer, and may be a single layer film or a multilayer film. In the present invention, being porous means having a plurality of independent holes and / or continuous holes. Since the film layer is porous at least on the bonding surface with the anticorrosion sheet layer, the voids formed by the porous independent holes and / or continuous holes are impregnated with the petroleum wax in the anticorrosion sheet layer, thereby preventing corrosion. The adhesiveness between the sheet layer and the film layer becomes extremely good. Thereby, especially in the summer when the temperature is high, peeling between the anticorrosion sheet layer and the film layer is satisfactorily prevented. Moreover, the other surface of the film layer can be easily attached to the protective cover using an adhesive or the like. For this reason, when applying the anticorrosion coating material to the object to be coated, peeling does not occur between the anticorrosion sheet layer and the protective cover, and the workability can be remarkably improved.

  The film layer is a multilayer film having a base layer and a porous surface layer formed on one or both sides of the base layer, and the base layer is made of a porous material having non-porous or independent pores. It is preferably made of a porous material having independent pores and / or continuous pores, and the film layer is preferably bonded to the anticorrosive sheet layer in the porous surface layer.

  In this case, the voids in the porous surface layer are impregnated with petroleum wax in the anticorrosion sheet layer, and the adhesiveness between the anticorrosion sheet layer and the film layer is improved and peeling is prevented. On the other hand, since the petroleum wax does not permeate the base layer because the base layer does not have continuous holes, the workability of the film layer caused by the seepage of petroleum wax on the surface opposite to the bonding surface of the film layer to the anticorrosion sheet layer is improved. Deterioration can be prevented better. The porous surface layer and the base layer may each have a single layer structure or a multilayer structure.

  Even if the porous surface layer is formed only on the bonding surface side with the anticorrosion sheet layer, the effect of improving the workability is obtained satisfactorily, but when the porous surface layer is formed on both surfaces of the base layer, for example, a film layer and When the protective cover is bonded using an adhesive, the adhesive is impregnated into the porous surface layer formed on the protective cover side of the film layer, so that the adhesion between the film layer and the protective cover can be improved. There is also an advantage that it can

  FIG. 2 is a cross-sectional view showing an example of the configuration of the film layer used in the present invention. FIG. 2 shows a case where the porous surface layers 122 and 123 are formed on both surfaces of the base layer 121. In the film layer having the configuration as shown in FIG. 2, any of the porous surface layers 122 and 123 may be a bonding surface with the anticorrosion sheet layer. The material and form of the porous surface layer 122 and the porous surface layer 123 may be the same or different.

  Examples of the base layer include a stretched film or an unstretched film made of a resin such as polyethylene terephthalate (PET), polyethylene (PE), polypropylene (PP), and polystyrene (PS). When the base layer has independent pores, the independent pores can be microvoids formed by stretching a film containing an inorganic filler or the like, for example.

  The thickness of the base layer is preferably in the range of 10 to 500 μm. When the thickness of the base layer is 10 μm or more, the strength of the film can be ensured, and the oil wax oozes out to the surface of the film layer opposite to the surface to be bonded to the anticorrosive sheet layer, that is, the surface to be bonded to the protective cover. When the thickness is 500 μm or less, it is advantageous in that the film has flexibility and the followability to the anticorrosion sheet layer is improved.

  Examples of the porous surface layer include a layer made of polyethylene terephthalate (PET), polyethylene (PE), polypropylene (PP), polystyrene (PS), polyvinyl chloride (PVC), and the like. The porous surface layer can be formed, for example, as a porous film having independent pores and / or continuous pores. The independent holes can be microvoids formed by stretching a film containing an inorganic filler or the like, for example.

  The thickness of the porous surface layer is preferably in the range of 2 to 100 μm. When the thickness of the porous surface layer is 2 μm or more, the adhesion between the anticorrosion sheet layer and the film layer is particularly good. When the thickness is 100 μm or less, the film has flexibility and good followability to the anticorrosion sheet layer. This is advantageous.

  In addition, the multilayer film mentioned above should just have at least said base layer and porous surface layer, and may consist only of a base layer and a porous surface layer, but in another range in which the effect of this invention is not impaired. You may have a layer.

[Anti-corrosion coating with protective cover]
The present invention also provides an anticorrosion coating material with a protective cover, which has at least the above-mentioned anticorrosion coating material and a protective cover, and is formed by attaching the film layer side surface of the anticorrosion coating material to the protective cover. FIG. 3 is a cross-sectional view showing an example of the configuration of the anticorrosion coating material with a protective cover obtained by attaching a protective cover to the anticorrosion coating material shown in FIG. 1 using an adhesive. In the anticorrosion coating material 200 with the protective cover shown in FIG. 3, the film layer 12, the pressure-sensitive adhesive layer 13, and the protective cover 14 are formed in this order on one surface of the anticorrosion sheet layer 11, and the other anticorrosion sheet layer 11 has the other side. A release film 15 is formed on the surface. The anticorrosion coating material of the present invention is typically applied to an anticorrosive structure such as a steel sheet pile after being previously bonded to a protective cover 14 as shown in FIG.

  As a preferable aspect of bonding of the anticorrosion coating material and the protective cover in the anticorrosion coating material with a protective cover of the present invention, bonding using an adhesive layer 13 as shown in FIG. 3 can be exemplified. As the adhesive layer 13, for example, acrylic, urethane, natural rubber, styrene butadiene, isobutylene, styrene isoprene, and the like can be preferably used.

As the protective cover 14, for example, FRP (fiber reinforced resin) can be preferably used.
When the anticorrosion coating material 200 with a protective cover is applied to an anticorrosive structure such as a steel sheet pile, the release film 15 is peeled off, and the surface of the anticorrosion sheet layer 11 is bonded to the anticorrosive structure. The

[Construction of anti-corrosion coating]
FIG. 4 is a view showing an example of a steel sheet pile on which the anticorrosion coating material according to the present invention is constructed. In the anticorrosion construction steel sheet pile 300 shown in FIG. 4, the substrate adjustment surface 32 is formed by cleaning the surface by removing attached organisms, floating rust, etc. on the surface of the steel sheet pile 31, and the substrate adjustment surface. 3 is bonded to the anticorrosion coating material 200 with a protective cover shown in FIG. 3 via an anticorrosive paste 33 containing, for example, petrolatum, a corrosion inhibitor, a filler, etc. Further, an anticorrosion coating material with a protective cover comprising an adhesive layer 13 and a protective cover 14 is bonded. If the steel sheet pile 31 to the protective cover 14 are fixed with the bolt nut 34, the tie rod 35, etc., the anti-corrosion construction steel sheet pile 300 in which the anti-corrosion coating material was constructed to the steel sheet pile 31 will be formed. Since the anticorrosion coating material of the present invention does not peel off between the anticorrosion sheet layer 11 and the protective cover 14 at the time of construction, it exhibits good workability even for a plate-like structural material such as a steel sheet pile. To do.

  EXAMPLES Hereinafter, although an Example is given and this invention is demonstrated in detail, this invention is not limited to these.

[Examples 1 and 2 and Comparative Example 1]
<Anti-corrosion sheet layer>
The following compounding ingredients were mixed to prepare an impregnation material.
Petrolatum (manufactured by Yamabun Oil Chemical Co., Ltd., trade name “PH05”): 65.4 parts by mass Clay (product made by Shiroishi Calcium, trade name “Hard Top Clay S”): 34.5 parts by mass Tannic acid: 0.1 parts by mass The base material made of polyester nonwoven fabric was impregnated with the impregnated material obtained in step 100 to 120 ° C. to obtain an anticorrosion sheet layer. The content of petrolatum in the obtained anticorrosion sheet layer was 6 parts by mass with respect to 1 part by mass of the nonwoven fabric.

<Film layer>
The film layers used in each Example and Comparative Example 1 are as follows.
Example 1: “YUPO FPG-60” (thickness: 60 μm) manufactured by YUPO Corporation, having a porous surface layer on both sides of the base layer, and micropores exist as independent pores in the base layer and the porous surface layer. The base layer and the porous surface layer are mainly composed of polypropylene and contain an inorganic filler and a small amount of additives.
Example 2: “Peach Coat SPB-80” (thickness 80 μm) manufactured by Nisshinbo Industries, Inc., having a porous surface layer (thickness 30 μm) having continuous pores on one side of a base layer (thickness 50 μm) made of a polypropylene film.
Comparative Example 1: A non-porous linear low density polyethylene film (thickness 25 μm) having a corona discharge treatment on one side.

<Preparation of specimen>
FIG. 5 is a perspective view for explaining a method for performing a deviation test in each example and comparative example 1, and FIG. 6 is a plan view for explaining a method for conducting a deviation test in each example and comparative example 1. First, as shown in FIG. 6, a film layer 53 and an anticorrosion sheet layer 52 were bonded to the surface of an FRP plate 51 made of glass fiber reinforced polyester via a double-sided tape 54. In Example 2, the surface on the porous surface layer side of the film layer and the surface on the corona discharge treatment side of the film layer in Comparative Example 1 were respectively bonded to the anticorrosion sheet layer.

  Bonding in each Example and Comparative Example 1 was performed under the condition of pressure bonding for 5 seconds with a load of 2 kg. Moreover, the anticorrosion sheet layer 52, the film layer 53, and the double-sided tape 54 were each 50 mm x 50 mm, and the adjacent layers were bonded together on the whole surface.

  Next, a 100 g weight 56 was connected to the anticorrosion sheet layer 52 to prepare a test specimen. Three test specimens were prepared for each Example and Comparative Example 1 in order to be used for the test under the following three conditions.

<Displacement test>
With the weight 56 lowered, the test specimen is left to stand under three conditions of 23 ° C. for 73 hours, 40 ° C. for 43 hours, and 50 ° C. for 24 hours. Visually evaluated. The results are shown in Table 1.

  In Comparative Example 1 using a polyethylene film having a non-porous surface as the film layer, peeling occurred between the anticorrosion sheet layer and the film layer. This is probably because the adhesion between the anticorrosion sheet layer and the film layer was poor because the surface of the film layer was not porous.

  On the other hand, in Examples 1 and 2 using a film having a porous surface layer as a film layer, no peeling occurred between the anticorrosion sheet layer and the film layer and between the film layer and the double-sided tape. . This is presumably because the adhesion between the anticorrosion sheet layer and the film layer was good, and the petrolatum in the anticorrosion sheet layer did not exude to the double-sided tape side.

  From the above results, it can be seen that in the anticorrosion coating material of the present invention, the adhesion between the anticorrosion sheet layer and the film layer is good and the permeation of the petroleum wax film layer in the anticorrosion sheet layer can be prevented.

  It should be understood that the embodiments and examples disclosed herein are illustrative and non-restrictive in every respect. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  The anticorrosion coating material of the present invention and the anticorrosion coating material with a protective cover having the same can be applied particularly preferably to a plate-like structural material such as a steel sheet pile.

It is sectional drawing which shows the example of a structure of the anti-corrosion coating material which concerns on this invention. It is sectional drawing which shows the example of a structure of the film layer used in this invention. It is sectional drawing which shows the example of a structure of the anti-corrosion coating material with a protective cover formed by affixing a protective cover on the anti-corrosion coating material shown in FIG. It is a figure which shows the example of the steel sheet pile with which the anti-corrosion coating material which concerns on this invention was constructed. It is a perspective view explaining the implementation method of the shift | offset | difference test in each Example and the comparative example 1. FIG. It is a top view explaining the implementation method of the shift | offset | difference test in each Example and Comparative Example 1.

Explanation of symbols

  100 anticorrosion coating material, 200 anticorrosion coating material with protective cover, 300 anticorrosion construction steel sheet pile, 11,52 anticorrosion sheet layer, 12,53 film layer, 13 adhesive layer, 14 protective cover, 15 release film, 121 base layer, 122 , 123 Porous surface layer, 31 Steel sheet pile, 32 Base adjustment surface, 33 Anticorrosion paste, 34 Bolt nut, 35 Tie rod, 51 FRP plate, 54 Double-sided tape, 56 Weight.

Claims (4)

It has an anticorrosion sheet layer and a film layer bonded to the anticorrosion sheet layer,
The anticorrosion sheet layer is formed by impregnating a base material with petroleum wax,
The film layer, a base layer of 10 to 500 [mu] m thickness, one or thickness formed on both surfaces of the base layer is a multilayer film having a porous surface layer of 2 to 100 m,
The base layer is made of a resin, a stretched film or an unstretched film,
The porous surface layer is made of a porous material having independent pores and / or continuous pores,
The film layer is an anticorrosion coating material that is bonded to the anticorrosion sheet layer in the porous surface layer.   The anticorrosion coating material according to claim 1, wherein the petroleum wax is mainly composed of petrolatum.   The anticorrosion coating material according to claim 1, wherein the base material is a nonwoven fabric. The anticorrosion coating material according to any one of claims 1 to 3 and a protective cover made of a fiber reinforced resin,
An anticorrosion coating material with a protective cover, which is formed by attaching the film layer side surface of the anticorrosion coating material to the protective cover.

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