JP2022112340A - Anticorrosive tape and anticorrosive structure - Google Patents

Abstract

To provide an anticorrosive tape or the like that enables an anticorrosive structure to exhibit sufficient anticorrosive performance and heat resistance.SOLUTION: An anticorrosive tape according to the present invention comprises a fiber sheet and a compound that is supported on the fiber sheet and contains a silicone compound, wherein the moisture content of the compound is 1000 ppm or less.SELECTED DRAWING: None

Description

TECHNICAL FIELD The present invention relates to an anticorrosion tape and an anticorrosion structure provided with the anticorrosion tape.

2. Description of the Related Art Conventionally, in various plants, metal pipes are used as gas pipes, water pipes, and pipes for transporting liquid raw materials such as oil.
2. Description of the Related Art In a plant or the like built on the seaside, an anti-corrosion structure is formed so as to cover the metal members such as the metal pipes in order to protect the metal members from corrosion.

As a general method for forming an anti-corrosion structure, a method using an anti-corrosion tape in which an anti-corrosion compound is supported on a strip-shaped base sheet is known.
In the method using the anti-corrosion tape, the anti-corrosion tape is wound so as to cover the surface of the metal member, thereby forming an anti-corrosion layer on the surface of the metal member with the anti-corrosion tape, thereby forming an anti-corrosion structure. (for example, Patent Document 1).
Patent Document 1 describes an anticorrosion tape used for forming the anticorrosion layer as described above, in which an anticorrosion compound containing a main component (oil) is supported on a strip-shaped base material (nonwoven fabric, etc.). It is

As the anticorrosive tape as described above, there is also known one in which an anticorrosive compound containing a silicone compound having excellent heat resistance as a main component (oil) is supported on a strip-shaped base material (for example, Patent Document 2).

The anti-corrosion tape containing a silicone compound as an anti-corrosion compound as described in Patent Document 2 is wound so as to cover the surface of the metal member, and then the anti-corrosion compound is cured to remove the surface of the metal member. and the anti-corrosion layer.
This allows the anticorrosion structure provided with the anticorrosion tape to exhibit sufficient anticorrosion properties and heat resistance.

JP-A-10-44320 JP 2019-72856 A

By the way, among the compounds supported on the base material, the compound supported on the surface layer portion of the base material cures faster than the compound supported on the inside of the base material. The curing of the compound carried on the sufficiency may not proceed sufficiently.
In such a case, the gap between the anticorrosion tape and the metal member cannot be made sufficiently small, and the anticorrosion structure provided with the anticorrosion tape cannot exhibit sufficient anticorrosion properties and heat resistance.

However, it is difficult to say that sufficient studies have been made to allow a corrosion-resistant structure provided with an anti-corrosion tape to exhibit sufficient anti-corrosion properties and heat resistance by appropriately controlling the curing of the compound of the anti-corrosion tape. .

Accordingly, an object of the present invention is to provide an anti-corrosion tape that allows the anti-corrosion structure to exhibit sufficient anti-corrosion properties and heat resistance, and an anti-corrosion structure provided with the anti-corrosion tape.

As a result of extensive studies by the present inventors, it was found that in an anticorrosion tape having a fiber sheet and a compound containing a silicone compound supported by the fiber sheet, the water content of the compound is supported on the surface layer portion of the fiber sheet. It was found that this contributed to the acceleration of the curing of the compound.
By setting the water content of the compound to 1000 ppm or less, it is possible to suppress the acceleration of hardening of the compound supported on the surface layer portion of the fiber sheet, thereby appropriately controlling the hardening of the compound of the anticorrosive tape. The inventors have found that an anticorrosion structure provided with the anticorrosion tape can exhibit sufficient anticorrosion properties and heat resistance, and have arrived at the present invention.

That is, the anticorrosion tape according to the present invention is
a fiber sheet;
a compound carried on the fiber sheet and containing a silicone compound;
The water content of the compound is 1000 ppm or less.

According to such a configuration, it is possible to suppress acceleration of hardening of the compound carried on the surface layer portion of the fiber sheet, thereby appropriately controlling hardening of the compound of the anticorrosive tape.
As a result, when the anti-corrosion tape is provided in the anti-corrosion structure, the anti-corrosion structure can exhibit sufficient anti-corrosion properties and heat resistance.

In the anticorrosion tape,
It is preferable that the compound contains a reaction-curable silicone compound as the silicone compound and has a viscosity of 25 Pa·s or more and 250 Pa·s or less at 23°C.

According to such a configuration, it is possible to further suppress the acceleration of hardening of the compound carried on the surface layer portion of the fiber sheet, thereby more appropriately controlling the hardening of the compound of the anticorrosive tape.
As a result, when the anti-corrosion tape is provided in the anti-corrosion structure, the anti-corrosion structure can exhibit sufficient anti-corrosion properties and heat resistance.

In the anticorrosion tape,
It is preferable that the fiber sheet has a mass reduction rate of 10% by mass or less after heat treatment at 300° C. for 24 hours.

According to such a configuration, even when exposed to a high temperature of 300° C. for a long time of 24 hours, the adhesion between the surface of a metal member such as a metal pipe and the anticorrosion tape can be maintained. can be done.
That is, the anti-corrosion structure provided with the anti-corrosion tape having the structure as described above is further excellent in heat resistance, and as a result, is also excellent in anti-corrosion properties.

In the anticorrosion tape,
The fiber sheet preferably has a basis weight of 30 g/m ² or more and 150 g/m ² or less.

According to such a configuration, the fiber sheet can be relatively easily impregnated with the compound. That is, the anticorrosion tape is more sufficiently impregnated with the compound.
Therefore, in a state in which the anticorrosion tape is wrapped around a metal member such as a metal pipe, the anticorrosion tape is sufficiently hardened to further suppress the formation of a gap between the metal member and the anticorrosion tape. can be done.
As a result, the anti-corrosion structure provided with the anti-corrosion tape having the structure described above is even more excellent in anti-corrosion properties and heat resistance.

The anti-corrosion structure according to the present invention is
Equipped with an anti-corrosion layer composed of anti-corrosion tape,
The anticorrosion tape has a fiber sheet and a compound supported by the fiber sheet and containing a silicone compound,
The water content of the compound is 1000 ppm or less.

According to such a configuration, it is possible to suppress acceleration of hardening of the compound carried on the surface layer portion of the fiber sheet, thereby appropriately controlling hardening of the compound of the anticorrosive tape.
As a result, the anti-corrosion structure can exhibit sufficient anti-corrosion properties and heat resistance.

In the anticorrosion structure,
Further comprising a topcoat layer laminated on the anticorrosion layer,
The topcoat layer is formed of a topcoat containing oil,
It is preferable that the oil contains a silicone compound.

According to such a configuration, in the state of being laminated on the anticorrosion layer composed of the anticorrosion tape containing the silicone compound, the anticorrosion layer has a relatively high affinity with the anticorrosion layer, and the oil content is added to the anticorrosion layer. becomes easier to impregnate.
As a result, the anti-corrosion structure has relatively high adhesion between the top coat layer and the anti-corrosion layer.

In the anticorrosion structure,
The top coat preferably has a viscosity of 0.05 Pa·s or more and 100 Pa·s or less at 23°C.

According to such a configuration, the topcoat layer can be easily applied to the anticorrosion layer. can be done.

In the anticorrosion structure,
Preferably, the topcoat further contains a tin-based catalyst.

According to such a configuration, the tin-based catalyst can be moved into the anticorrosion layer from the topcoat layer formed by the topcoat, so that the curing reaction in the anticorrosion layer proceeds more easily.

In the anticorrosion structure,
It further comprises a primer layer interposed between the anticorrosion layer and an object and applied to the object, the primer layer being formed of a primer as an anticorrosion paste for anticorrosion of the object. ,
It is preferable that the primer layer contains a silicone compound.

According to such a configuration, when the anticorrosion layer is brought into contact with the primer layer, the affinity between the anticorrosion layer and the primer layer is relatively high.
As a result, the anti-corrosion structure has relatively high adhesion between the anti-corrosion layer and the primer layer.

In the anticorrosion structure,
further comprising an anti-corrosion mastic layer disposed between the primer layer and the anti-corrosion layer and formed of an anti-corrosion mastic;
Preferably, the anticorrosion mastic layer contains a silicone compound.

According to such a configuration, when the anti-corrosion mastic layer is in contact with the primer layer and the anti-corrosion layer, the anti-corrosion mastic layer has a relatively high affinity with the primer layer and the anti-corrosion layer. becomes.
As a result, the anti-corrosion structure has relatively high adhesion between the anti-corrosion mastic layer, the primer layer and the anti-corrosion layer.

In the anticorrosion structure,
The anticorrosion mastic preferably has a consistency of 40 or more and 150 or less.

According to such a configuration, when the anticorrosion mastic layer is formed by filling the anticorrosion mastic layer between the primer layer and the anticorrosion layer, it is relatively easy to fill the anticorrosion mastic layer. The anti-corrosion mastic layer can have relatively good shape retention.

In the anticorrosion structure,
It is preferable that the anticorrosive mastic has a mass reduction rate of 20% by mass or less after heat treatment at 300° C. for 24 hours.

According to such a configuration, after the anticorrosion mastic layer is formed by filling the space between the primer layer and the anticorrosion layer, the anticorrosion mastic layer can have a relatively high density. .
As a result, the anti-corrosion structure is even more excellent in heat resistance.

ADVANTAGE OF THE INVENTION According to this invention, the anti-corrosion tape which can make an anti-corrosion structure exhibit sufficient anti-corrosion property and heat resistance, and an anti-corrosion structure provided with this anti-corrosion tape can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS Sectional drawing which shows the structure of the anti-corrosion structure which concerns on one Embodiment of this invention.

An embodiment of the present invention will be described below.

[Anti-corrosion tape]
An anticorrosion tape according to one embodiment of the present invention (hereinafter also referred to as an anticorrosion tape according to the present embodiment) includes a fiber sheet and a compound supported by the fiber sheet and containing a silicone compound (main component). have.

Since the fiber sheet is generally porous and has excellent impregnating properties and water permeability, it can be sufficiently impregnated with the compound, and as a result, can sufficiently support the compound.

The fibers constituting the fiber sheet include polyethylene terephthalate fiber (PET fiber), aramid fiber, polyphenylene sulfide fiber (PPS fiber), polyacrylonitrile-based carbon fiber (PAN-based carbon fiber), polyparaphenylene benzobisoxazole fiber (PBO fiber), polytetrafluoroethylene fiber (PTFE fiber), nylon fiber, and the like.
The PAN-based carbon fiber may be a flame-resistant fiber obtained by heat-treating polyacrylonitrile in an oxidizing atmosphere.
As the aramid fibers, meta-aramid fibers (m-aramid fibers) and para-aramid fibers (p-aramid fibers) are preferably used.

A nonwoven fabric is preferably used as the fiber sheet. In addition, in this specification, a nonwoven fabric is a concept including felt.
The nonwoven fabric preferably has a basis weight (mass per unit area) of 30 g/m ² or more and 150 g/m ² or less.
The nonwoven fabric is preferably formed using fibers having a thickness of 1.5 decitex or more and 4 decitex or less.

As the nonwoven fabric, those produced by various known methods such as spunbond, chemical bond, needle punch, and stitch bond can be used.
Among the nonwoven fabrics produced by the above-mentioned various methods, it is preferable to use a spunlaced nonwoven fabric from the viewpoint that the strength in the longitudinal direction of the fiber sheet can be excellent. It is more preferable to use a non-woven fabric.

The fiber sheet preferably has a mass reduction rate of 10% by mass or less after heat treatment at 300° C. for 24 hours.
By using the fiber sheet having the above characteristics, the anticorrosion tape can be made more excellent in heat resistance, and in the anticorrosion structure, the anticorrosion layer formed by the anticorrosion tape can be made more excellent in heat resistance.
The mass reduction rate of the fibrous sheet means the mass reduction ratio of the fibrous sheet after exposure to 300°C to the mass of the fibrous sheet before exposure to 300°C.

The anticorrosion tape according to the present embodiment is used after being wound so as to cover a primer layer formed by applying a primer to the surface of a metal member such as a metal pipe, and then curing the compound.
Therefore, the compound has reaction curability. The compound may have reaction hardenability by including a reaction hardenable silicone compound as the silicone compound.
The compound preferably contains 15% by mass or more, more preferably 25% by mass or more, of the silicone compound.
That is, it is preferable that the compound contains a reaction-curing silicone compound as the silicone compound.
Examples of such silicone compounds include straight silicone oil, reactive modified silicone oil, and non-reactive modified silicone oil.
Examples of straight silicone oils include dimethylsilicone oil, methylphenylsilicone oil, and methylhydrogensilicone oil.
The reactive modified silicone oil has an amine group, an epoxy group, a carbinol group, a mercapto group, a carboxyl group, a methacrylic group, a polyether group, a phenol group, a silanol group, an acrylic groups, acid anhydride groups and the like are added.
Examples of the non-reactive modified silicone oil include those having a polyether group, an aralkyl group, a fluoroalkyl group, a long-chain alkyl group, a fatty acid ester, a fatty acid amide, etc. added to a side chain, one end, or both ends. be done.
Commercially available silicone compounds as described above include YF3800 (manufactured by Momentive Performance Materials Japan), YF3905 (manufactured by Momentive Performance Materials Japan), YF3057 (Momentive Performance Materials)・Manufactured by Momentive Performance Materials Japan), YF3807 (manufactured by Momentive Performance Materials Japan), YF3802 (manufactured by Momentive Performance Materials Japan), YF3897 (manufactured by Momentive Performance Materials Japan) ), KF9701 (manufactured by Shin-Etsu Chemical Co., Ltd.), PAM-E (manufactured by Shin-Etsu Chemical Co., Ltd.), KF-8008 (manufactured by Shin-Etsu Chemical Co., Ltd.), KF-105 (manufactured by Shin-Etsu Chemical Co., Ltd.), KF-2201 (manufactured by Shin-Etsu Chemical Co., Ltd.), WAXKER (registered trademark) SILICONE FLUID AK0.65-10 (manufactured by Asahi Kasei Wacker Silicone Co., Ltd.), WAXKER (registered trademark) SILICONE FLUID AK20-5,000 (manufactured by Asahi Kasei Wacker Silicone Co., Ltd.) WAXKER (registered trademark) SILICONE FLUID AK100-10, 000 (manufactured by Asahi Kasei Wacker Silicone Co., Ltd.), DOWSIL (registered trademark) SF 8427 Fluid (manufactured by Dow Toray Industries), DOWSIL (registered trademark) BY 16-750 Fluid (manufactured by Dow Toray Industries), and the like.

From the viewpoint of allowing the curing reaction to proceed satisfactorily even at room temperature (23±1° C.), the compound preferably cures through a condensation reaction. Therefore, the silicone compound preferably has a silanol group as a reactive group, or an alkoxysilyl group that becomes a silanol group by hydrolysis.
Specifically, the silicone compound is preferably a silicone oil having a chain structure or a branched structure having a plurality of hydroxyl groups in the molecule. A chain silicone having hydroxyl groups at both ends such as polydimethylsiloxane diol Oils are particularly preferred.
The silicone oil preferably has a kinematic viscosity at 25° C. of 1000 mm ² /s or more and 5000 mm ² /s or less as measured by JIS K2283 “Crude oil and petroleum products-Kinematic viscosity test method and viscosity index calculation method”.
Examples of commercially available silicone compounds having reaction curing properties as described above include YF3057 (manufactured by Momentive Performance Materials Japan Co., Ltd.).

The compound may contain a cross-linking agent for cross-linking the silicone compound, an inorganic filler, and the like.

Examples of the cross-linking agent include silicone compounds that condense with the above-described polydimethylsiloxane diol or the like by dealcoholization. As such a silicone compound, one having one or more alkoxy groups is suitable.
A polyalkoxypolysiloxane represented by the following general formula (1) is preferably used as a cross-linking agent for cross-linking the above silicone oil having a chain structure.
Among polyalkoxypolysiloxanes represented by the following general formula (1), it is particularly preferable to use ethyl silicate.

（なお、式（１）中のＲは、同一の又は異なる炭素数のアルキル基であり、ｎは１以上１００以下の整数である）

(R in formula (1) is an alkyl group with the same or different carbon atoms, and n is an integer of 1 or more and 100 or less)

Specific names of the cross-linking agent include, for example, methyltrimethoxysilane, methyltriethoxysilane, ethyltrimethoxysilane, ethyltriethoxysilane, butyltrimethoxysilane, butyltriethoxysilane, vinyltrimethoxysilane, and phenyltrimethoxysilane. trifunctional alkoxysilanes such as; tetrafunctional alkoxysilanes such as tetramethoxysilane, tetraethoxysilane, tetrapropoxysilane; methyltripropenoxysilane, methyltriacetoxysilane, vinyltriacetoxysilane, methyltri(butanoxime)silane, propyl Tri(butanoxime)silane, Phenyltri(butanoxime)silane, Propyltri(butanoxime)silane, Tetra(butanoxime)silane, 3,3,3-Trifluoropropyltri(butanoxime)silane, 3-Chloropropyltri(butanoxime)silane , methyltri(propanoxime)silane, methyltri(pentanoxime)silane, methyltri(isopentanoxime)silane, vinyltri(cyclopentanoxime)silane, methyltri(cyclohexanoxime)silane, and the like.
The crosslinker may be an alkylpolysiloxane such as methylpolysiloxane or ethylpolysiloxane.

A silane coupling agent may be used as the cross-linking agent. As the silane coupling agent, one having an amino group is preferably used.
Examples of the silane coupling agent include N-2-(aminoethyl)-3-aminopropylmethyldimethoxysilane, N-2-(aminoethyl)-3-aminopropyltrimethoxysilane, N-2-(amino ethyl)-3-aminopropyltriethoxysilane, 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, 3-triethoxysilyl-N-(1,3-dimethyl-butylidene)propylamine, N-phenyl -3-aminopropyltrimethoxysilane and the like.

Commercially available products of the cross-linking agent include "Silicate 45" (trade name) manufactured by Tama Chemical Co., Ltd., and the like.
When the compound contains the cross-linking agent, the content thereof is preferably 0.05 parts by mass or more and 10 parts by mass or less, and 0.1 parts by mass or more, relative to 100 parts by mass of the silicone compound. It is more preferably 7 parts by mass or less.

The molar ratio (-OR:-OH) between the alkoxy group (-OR) of the cross-linking agent and the hydroxyl group (-OH) of the silicone oil is usually in the range of 1:100 to 100:10. A ratio of 10 to 10:1 is preferred.

Examples of the inorganic filler include aluminum hydroxide, magnesium hydroxide, talc, silica, clay, calcium carbonate, bentonite, mica, mica-like iron oxide, and metal powder.
The compound preferably contains calcium carbonate and aluminum hydroxide as the inorganic filler.
When the compound contains the inorganic filler, the content thereof is preferably 50 parts by mass or more and 400 parts by mass or less with respect to 100 parts by mass of the silicone compound.
Further, when the compound contains calcium carbonate and calcium hydroxide as the inorganic filler, the ratio of the content of calcium carbonate to the content of aluminum hydroxide (content of calcium carbonate / content of aluminum hydroxide amount) is preferably 1 or more and 5 or less.

Further, the silicone oil and the inorganic filler are preferably contained in the compound at a mass ratio (silicone oil:inorganic filler) of 20:80 to 40:60.
The total mass ratio of the silicone oil and the inorganic filler is preferably 50% by mass or more, more preferably 80% by mass or more, and particularly preferably 90% by mass or more of the compound.

It is important that the compound has a water content of 1000 ppm or less. Since the water content of the compound is 1000 ppm or less, the anticorrosion tape is wound around a primer layer formed by applying a primer to the entire surface of a metal member such as a metal pipe to form an anticorrosion layer. , when curing the compound, it is possible to suppress the acceleration of the curing of the compound carried on the surface layer portion of the fiber sheet, thereby appropriately controlling the curing of the compound of the anticorrosion tape.
As a result, when the anti-corrosion tape is provided in the anti-corrosion structure, the anti-corrosion structure can exhibit sufficient anti-corrosion properties and heat resistance.
The present inventors consider the reason why the curing of the compound of the anticorrosive tape is appropriately controlled when the compound is cured by setting the water content of the compound to 1000 ppm or less as follows.

As a result of intensive studies by the present inventors, when the water content of the compound containing the silicone compound is relatively high (the water content exceeds 1000 ppm), among the compounds supported on the fiber sheet, the fiber sheet The curing of the compound carried on the surface layer portion of the fiber sheet progresses faster than the compound carried on the inside of the fiber sheet, and the curing of the compound carried on the inside of the fiber sheet does not progress sufficiently.
Such a phenomenon is caused by laminating a primer layer containing a catalyst for promoting the curing reaction of the silicone compound on one side of the anticorrosion layer, and the silicone compound on the other side, as in the anticorrosion structure described later. When a topcoat layer containing a catalyst for promoting the curing reaction of is laminated, it becomes more noticeable when these catalysts migrate to the anticorrosion layer. Specifically, the surface layer portion of the anticorrosion layer hardens due to the curing reaction that occurs in the surface layer portion of the anticorrosion layer, so that the catalyst cannot sufficiently move into the interior of the anticorrosion layer, and the surface layer of the anticorrosion layer Parts become selectively hardened.
However, in the anticorrosion tape according to the present embodiment, the water content of the compound is set to a relatively small value of 1000 ppm or less. It is thought that there are
In addition, as described above, even when the catalyst moves from the primer layer and the topcoat layer to the anticorrosion layer, it is possible to suppress acceleration of curing of the compound supported on the surface layer portion of the fiber sheet. It is considered that the catalyst can be sufficiently transferred to the compound supported inside the fiber sheet.
From the above, the present inventors have found that the anticorrosion tape according to the present embodiment appropriately controls the hardening of the compound supported by the fiber sheet, so that the anticorrosion structure provided with the anticorrosion tape has sufficient anticorrosion properties and It is considered that the heat resistance can be exhibited.

The water content of the compound is obtained by kneading a silicone compound such as silicone oil with the cross-linking agent and the inorganic filler while heating the compound. can be adjusted by volatilizing the
The temperature and time for heating the compound obtained by kneading can be appropriately selected according to the amount of water contained in the compound.

The water content of the compound can be measured by Karl Fischer titration. The details of the measuring apparatus and measuring conditions are as follows.

- Measuring device: coulometric titration moisture measuring device (manufactured by Mitsubishi Chemical Analytic Tech, model CA-200), heating and vaporization device (manufactured by Mitsubishi Chemical Analytic Tech, model VA-200)
・Measurement conditions: Heat vaporization method (heated at 150°C)
・Anolyte: Aquamicron AKX (manufactured by Mitsubishi Chemical Corporation)
・ Catholyte: Aquamicron CXU (manufactured by Mitsubishi Chemical Corporation)

The compound preferably has a viscosity of 25 Pa·s or more and 250 Pa·s or less at 23°C.

The measurement of the viscosity at 23°C can be carried out at a temperature of 23±1°C using a BH type viscometer manufactured by Tokimec as a measuring device.
The number of the rotor to be used and the number of rotations of the rotor are selected according to the viscosity value V as follows.

・When V is 100 Pa·s or less (V≦100) Rotor number to be used: No. 6, rotor speed: 10rpm
・When V exceeds 100 Pa·s and is 250 Pa·s or less (100<V≦150) Rotor number to be used: No. 6, rotor speed: 4 rpm
・When V exceeds 250 Pa·s and is 1000 Pa·s or less (250<V≦1000) Rotor number to be used: No. 7, rotor speed: 4 rpm

In addition to the silicone compound, the cross-linking agent, and the inorganic filler, the compound contains various additives such as rust inhibitors, plasticizers, thickeners, antioxidants, colorants, and antifungal agents. may contain.

[Anti-corrosion structure]
Next, an anti-corrosion structure according to one embodiment of the present invention (hereinafter also referred to as an anti-corrosion structure according to this embodiment) will be described.
The anti-corrosion structure according to this embodiment has two or more layers.
Further, as shown in FIG. 1, the anti-corrosion structure 100 according to the present embodiment includes a primer layer 1 formed of a primer as an anti-corrosion paste for contacting the surface of the metal member 10 and preventing corrosion of the object, and an anticorrosion layer 2 formed of the anticorrosion tape according to the present embodiment.
Furthermore, the anti-corrosion structure 100 according to this embodiment further includes a top coat layer 3 formed of a top coat outside the anti-corrosion layer 2 (opposite to the primer layer 1 side).
In addition, the anticorrosion structure 100 according to this embodiment further includes an anticorrosion mastic layer 4 which is arranged between the primer layer 1 and the anticorrosion layer 2 and which is formed of an anticorrosion mastic.

The metal member 10 is used as a pipeline for transporting fluids. The metal member 10 includes a plurality of cylindrical tubes having flanges 11 , and the tubes are connected to each other by the flanges 11 . Flanges 11 of adjacent pipes are fixed with bolts 12 and nuts 13 . That is, the metal member 10 has a cylindrical shape, and its outer surface is uneven due to the flange portion 11, the bolt 12, the nut 13, and the like.

The anti-corrosion structure 100 according to the present embodiment has the primer layer 1, so that the gap between the anti-corrosion layer 2 and the metal member 10 can be filled, and corrosion of the metal member 10 can be suppressed. .
The primer layer 1 is formed by thinly applying a primer to the entire outer surface of the cylindrical metal member 10 . Therefore, the outer surface of the primer layer 1 is uneven due to the unevenness formed on the metal member 10 .

A primer for forming the primer layer 1 includes a main agent and a curing agent.

The main agent contains a silicone compound. Since the main agent contains a silicone compound, the primer has excellent heat resistance.
The silicone compound is preferably contained in the primer as a main component (oil). Examples of the silicone compound as the main component (oil) include straight silicone oil, reactive modified silicone oil, and non-reactive modified silicone oil.
Examples of straight silicone oils include dimethylsilicone oil, methylphenylsilicone oil, and methylhydrogensilicone oil.
The reactive modified silicone oil has an amine group, an epoxy group, a carbinol group, a mercapto group, a carboxyl group, a methacrylic group, a polyether group, a phenol group, a silanol group, an acrylic groups, acid anhydride groups and the like are added.
Examples of the non-reactive modified silicone oil include those having a polyether group, an aralkyl group, a fluoroalkyl group, a long-chain alkyl group, a fatty acid ester, a fatty acid amide, etc. added to a side chain, one end, or both ends. be done.
Commercially available silicone compounds as described above include YF3800 (manufactured by Momentive Performance Materials Japan), YF3905 (manufactured by Momentive Performance Materials Japan), YF3057 (Momentive Performance Materials)・Manufactured by Momentive Performance Materials Japan), YF3807 (manufactured by Momentive Performance Materials Japan), YF3802 (manufactured by Momentive Performance Materials Japan), YF3897 (manufactured by Momentive Performance Materials Japan) ), KF9701 (manufactured by Shin-Etsu Chemical Co., Ltd.), PAM-E (manufactured by Shin-Etsu Chemical Co., Ltd.), KF-8008 (manufactured by Shin-Etsu Chemical Co., Ltd.), KF-105 (manufactured by Shin-Etsu Chemical Co., Ltd.), KF-2201 (manufactured by Shin-Etsu Chemical Co., Ltd.), WAXKER (registered trademark) SILICONE FLUID AK0.65-10 (manufactured by Asahi Kasei Wacker Silicone Co., Ltd.), WAXKER (registered trademark) SILICONE FLUID AK20-5,000 (manufactured by Asahi Kasei Wacker Silicone Co., Ltd.) WAXKER (registered trademark) SILICONE FLUID AK100-10, 000 (manufactured by Asahi Kasei Wacker Silicone Co., Ltd.), DOWSIL (registered trademark) SF 8427 Fluid (manufactured by Dow Toray Industries), DOWSIL (registered trademark) BY 16-750 Fluid (manufactured by Dow Toray Industries), and the like.

It is important that the main agent has a viscosity of 16 Pa·s or more and 150 Pa·s or less at 23°C.
When the viscosity of the main agent is within the above numerical range, the primer containing the main agent is relatively unlikely to drip from the surface of the metal member 10 after being applied to the surface of the metal member 10. , the surface of the metal member 10 can be spread relatively easily.
As a result, the primer can be applied to the surface of the metal member 10 so as to have a relatively uniform thickness, so that the primer layer 1 can be formed on the surface of the metal member 10 with a relatively uniform thickness. .
As a result, when the anticorrosion tape is wound around the primer layer 1 to form the anticorrosion layer 2 to obtain the anticorrosion structure 100, the metal member 10 is not connected to the metal member 10 via the primer layer 1 in the anticorrosion structure 100. Adhesion of the anticorrosion layer 2 can be sufficiently ensured, and the gap between the anticorrosion layer 2 and the metal member 10 can be made sufficiently small.
Thereby, the anticorrosion structure 100 can exhibit sufficient heat resistance.

Examples of the curing agent include organic titanium compounds such as titanium tetraisopropoxide, titanium tetra-normal butoxide, butyl titanate dimer, titanium acetylacetonate, titanium octylene glycolate, and titanium ethylacetoacetate; aluminum tris(acetylacetonate); ), aluminum tris (ethyl acetoacetate) and other organoaluminum compounds; Organic zirconium compounds such as tetra-normal butoxide, zirconium acylate, zirconium tributoxy stearate, zirconium octoate, zirconyl (2-ethylhexanoate), zirconium (2-ethylhexoate); dibutyltin dioctoate, dibutyltin dilaurate , Dibutyl tin di(2-ethylhexanoate) and other organic tin compounds; Tin naphthenate, tin oleate, tin butyrate, dibutyl tin, octyl tin, dioctyl tin, cobalt naphthenate, zinc stearate and other organic carboxylic acids amine compounds such as hexylamine and dodecylamine phosphate, and salts thereof; benzyltriethylammonium acetate; dialkylhydroxylamines such as dimethylhydroxylamine and diethylhydroxylamine; guanidyl group-containing organic silicon compounds;
These may be used individually by 1 type, and may be used in combination of 2 or more type.
Among these curing agents, organic tin compounds, tin naphthenate, tin oleate, and tin butylate are preferred from the viewpoint of facilitating dehydration condensation between the silicone compounds and between the silicone compound and the cross-linking agent. , dibutyltin, octyltin, dioctyltin and the like are particularly preferred.
Commercially available tin-based catalysts include CE621 (manufactured by Momentive Performance Materials Japan), CE611 (manufactured by Momentive Performance Materials Japan), and CE601 (Momentive Performance Materials Japan). joint company), Neostan U-303 (manufactured by Nitto Kasei Co., Ltd.), Neostan U-810 (manufactured by Nitto Kasei Co., Ltd.), and the like.

In the anti-corrosion structure 100 according to this embodiment, the anti-corrosion layer 2 is formed of the above-described anti-corrosion tape according to this embodiment.
That is, the anticorrosion layer 2 is formed of an anticorrosion tape that has a fiber sheet and a compound containing a silicone compound supported on the fiber sheet, and the compound has a moisture content of 1000 ppm or less.

The topcoat layer 3 can be formed by applying a topcoat to the surface of the anticorrosion layer 2 .
The top coat contains a main component (oil), and the main component (oil) contains a silicone compound. It is preferable to use silicone oil as the main component (oil).
Examples of the silicone oil include straight silicone oil and non-reactive modified silicone oil.
Examples of the straight silicone oil include dimethyl silicone oil, methylphenyl silicone oil, and methylhydrogen silicone oil. Examples of the non-reactive modified silicone oil include a side chain, one terminal, or both terminals having a polyether group. , aralkyl groups, fluoroalkyl groups, long-chain alkyl groups, fatty acid esters, and aliphatic amides.
As commercially available products of silicone oil, trade name "KF96-50cp" and trade name "KF96-1000cp" manufactured by Shin-Etsu Chemical Co., Ltd. can be used.

The topcoat preferably contains a catalyst. The catalyst is preferably one that promotes dehydration condensation between silicone compounds.
Since the top coat contains the catalyst as described above, the catalyst is transferred from the top coat layer 3 formed by the top coat to the anticorrosion layer 2, and in the anticorrosion layer 2, the compound contained in the compound It is possible to accelerate the progress of the cross-linking reaction of the silicone compound.

Examples of the catalyst include organic titanium compounds such as titanium tetraisopropoxide, titanium tetra-normal butoxide, butyl titanate dimer, titanium acetylacetonate, titanium octylene glycolate, and titanium ethylacetoacetate; aluminum tris(acetylacetonate); , aluminum tris(ethylacetoacetate) and other organoaluminum compounds; Organic zirconium compounds such as normal butoxide, zirconium acylate, zirconium tributoxy stearate, zirconium octoate, zirconyl (2-ethylhexanoate), zirconium (2-ethylhexoate); dibutyltin dioctoate, dibutyltin dilaurate, Organic tin compounds such as dibutyltin di(2-ethylhexanoate); organic carboxylic acid compounds such as tin naphthenate, tin oleate, tin butyrate, dibutyltin, octyltin, dioctyltin, cobalt naphthenate, and zinc stearate; metal salts; amine compounds such as hexylamine and dodecylamine phosphate, and salts thereof; benzyltriethylammonium acetate; dialkylhydroxylamines such as dimethylhydroxylamine and diethylhydroxylamine;
These may be used individually by 1 type, and may be used in combination of 2 or more type.
Among these catalysts, organic tin compounds, tin naphthenate, tin oleate, tin butyrate, It is particularly preferred to use tin-based catalysts such as dibutyltin, octyltin and dioctyltin.
Commercially available tin-based catalysts include CE621 (manufactured by Momentive Performance Materials Japan), CE611 (manufactured by Momentive Performance Materials Japan), and CE601 (Momentive Performance Materials Japan). joint company), Neostan U-303 (manufactured by Nitto Kasei Co., Ltd.), Neostan U-810 (manufactured by Nitto Kasei Co., Ltd.), and the like.

Since the topcoat contains a catalyst such as a tin-based catalyst, the catalyst such as a tin-based catalyst can be transferred from the topcoat layer 3 formed by the topcoat to the anticorrosion layer 2 .
This makes it easier for the curing reaction of the compound having the reaction curing property in the anticorrosion layer 2 to proceed.

The topcoat may contain colorants, thickeners, and the like. As a commercial product of the colorant, the product name "Alpaste" manufactured by Toyo Aluminum Co., Ltd. can be mentioned, and as a commercial product of the thickener, the product name "Aerosil 130" manufactured by Nippon Aerosil Co., Ltd. can be mentioned. .

The top coat preferably has a viscosity of 0.05 Pa·s or more and 100 Pa·s or less at 23°C.
When the viscosity of the topcoat is within the above numerical range, the topcoat can be easily applied to the anticorrosion layer 2 . It can be formed with a uniform thickness.

The measurement of the viscosity at 23°C can be carried out at a temperature of 23±1°C using a BH type viscometer manufactured by Tokimec as a measuring device.
The number of the rotor to be used and the number of rotations of the rotor are selected according to the viscosity value V as follows.

・When V is 4 Pa·s or less (V≦4) Rotor number to be used: No. 2, rotor speed: 10 rpm
・When V exceeds 4 Pa·s and is 10 Pa·s or less (4<V≦10) Rotor number to be used: No. 3, rotor speed: 10 rpm
・When V exceeds 10 Pa·s and is 50 Pa·s or less (10<V≦50) Number of rotor to be used: No. 6, rotor speed: 20rpm
・When V exceeds 50 Pa·s and is 100 Pa·s or less (50<V≦100) Rotor number to be used: No. 6, rotor speed: 10rpm

The anti-corrosion mastic layer 4 is formed by filling the concave portions of the primer layer 1 with anti-corrosion mastic so as to reduce the unevenness of the primer layer 1 .
In the anti-corrosion structure 100 according to this embodiment, the anti-corrosion mastic layer 4 is formed by filling the gap between the primer layer 1 and the anti-corrosion layer 2 with the anti-corrosion mastic. As a result, corrosion of the metal member 10 is further suppressed in the anti-corrosion structure 100 according to this embodiment.

The anticorrosion mastic contains a main component (oil), and the main component (oil) contains a silicone compound. It is preferable to use silicone oil as the main component (oil).
Examples of the silicone oil include straight silicone oil, reactive modified silicone oil, and non-reactive modified silicone oil.
Examples of straight silicone oils include dimethylsilicone oil, methylphenylsilicone oil, and methylhydrogensilicone oil.
The reactive modified silicone oil has an amine group, an epoxy group, a carbinol group, a mercapto group, a carboxyl group, a methacrylic group, a polyether group, a phenol group, a silanol group, an acrylic groups, acid anhydride groups and the like are added.
Examples of the non-reactive modified silicone oil include those having a polyether group, an aralkyl group, a fluoroalkyl group, a long-chain alkyl group, a fatty acid ester, a fatty acid amide, etc. added to a side chain, one end, or both ends. be done.
Commercially available silicone compounds as described above include YF3800 (manufactured by Momentive Performance Materials Japan), YF3905 (manufactured by Momentive Performance Materials Japan), YF3057 (Momentive Performance Materials)・Manufactured by Momentive Performance Materials Japan), YF3807 (manufactured by Momentive Performance Materials Japan), YF3802 (manufactured by Momentive Performance Materials Japan), YF3897 (manufactured by Momentive Performance Materials Japan) ), KF9701 (manufactured by Shin-Etsu Chemical Co., Ltd.), PAM-E (manufactured by Shin-Etsu Chemical Co., Ltd.), KF-8008 (manufactured by Shin-Etsu Chemical Co., Ltd.), KF-105 (manufactured by Shin-Etsu Chemical Co., Ltd.), KF-2201 (manufactured by Shin-Etsu Chemical Co., Ltd.), WAXKER (registered trademark) SILICONE FLUID AK0.65-10 (manufactured by Asahi Kasei Wacker Silicone Co., Ltd.), WAXKER (registered trademark) SILICONE FLUID AK20-5,000 (manufactured by Asahi Kasei Wacker Silicone Co., Ltd.) WAXKER (registered trademark) SILICONE FLUID AK100-10, 000 (manufactured by Asahi Kasei Wacker Silicone Co., Ltd.), DOWSIL (registered trademark) SF 8427 Fluid (manufactured by Dow Toray Industries), DOWSIL (registered trademark) BY 16-750 Fluid (manufactured by Dow Toray Industries), and the like.

The anticorrosion mastic may contain inorganic fillers. Examples of the inorganic filler include aluminum hydroxide, magnesium hydroxide, talc, silica, clay, calcium carbonate, mica, mica-like iron oxide, and metal powder.
The anti-corrosion mastic may contain lightening agents and flame retardants. Examples of the weighting agent include silica balloons, and examples of the flame retardant include aluminum hydroxide.

The anticorrosive mastic preferably has a consistency of 40 or more and 150 or less.
As a result, the anticorrosion mastic is relatively easy to fill when forming the anticorrosion mastic layer 4 filled between the primer layer 1 and the anticorrosion layer 2, and in addition, the anticorrosion mastic layer 4 can be formed after filling. It can have relatively sufficient shape retention.
The consistency of the anti-corrosion mastic means a value measured at 23° C. based on JIS K2235-1991 “Petroleum wax 5.10 Consistency test method”.

The anti-corrosion mastic preferably has a mass reduction rate of 20% by mass or less after heat treatment at 300° C. for 24 hours.
Since the mass reduction rate is 20% by mass or less, after filling the anticorrosion mastic between the primer layer 1 and the anticorrosion layer 2 to form the anticorrosion mastic layer 4, the anticorrosion mastic layer 4 has a relatively high density. can be
Weight loss of said anti-corrosion mastic means the ratio of weight loss of said anti-corrosion mastic after exposure to 300°C for 24 hours to the weight of said anti-corrosion mastic before exposure to 300°C.

In addition, the anticorrosion tape and anticorrosion structure which concern on this invention are not limited to the said embodiment. Moreover, the anti-corrosion tape and the anti-corrosion structure according to the present invention are not limited by the effects described above. Various modifications can be made to the anticorrosion tape and the anticorrosion structure according to the present invention without departing from the gist of the present invention.

EXAMPLES Next, the present invention will be described more specifically with reference to examples. The following examples are intended to further illustrate the invention and are not intended to limit the scope of the invention.

(Anti-corrosion tape)
<Compound>
Silicone compound A (main component (oil)), cross-linking agent A as a cross-linking agent, and calcium carbonate (inorganic filler 1) and aluminum hydroxide (inorganic filler 2) as inorganic fillers are shown in Table 1 below. Compounds A to K were prepared by kneading at room temperature (23±1° C.) in the indicated weight ratios.
As properties of Compounds A to K, viscosity at 23° C. was measured, and surface drying properties, coating properties, and leveling properties were evaluated.

The viscosities of Compounds A to K at 23° C. were measured at a temperature of 23±1° C. using a BH viscometer manufactured by Tokimec.
The number of the rotor to be used and the number of rotations of the rotor were selected according to the viscosity value V as follows.

・When V is 100 Pa·s or less (V≦100) Rotor number to be used: No. 6, rotor speed: 10rpm
・When V exceeds 100 Pa·s and is 250 Pa·s or less (100<V≦150) Rotor number to be used: No. 6, rotor speed: 4 rpm
・When V exceeds 250 Pa·s and is 1000 Pa·s or less (250<V≦1000) Rotor number to be used: No. 7, rotor speed: 4 rpm

The surface drying properties of Compounds A to K were evaluated by applying Compounds A to K to one surface of the m-aramid fiber base material (base material B described later) and leaving it at room temperature (23 ± 1 ° C.) for 24 hours. Evaluation was made by examining dryness to the touch when one surface was touched with a finger.
The surface drying properties of compounds A to K were evaluated according to the following criteria.

〇: The compound does not adhere to fingers (excellent in touch dryness)
x: The compound adheres to the finger (poor dryness to the touch).

The coatability of compounds A to K was evaluated from the viewpoint of moldability of the anticorrosion tape when the anticorrosion tape was produced using a press. That is, the evaluation was made from the viewpoint of the influence of the coating properties of the compound on the base material on the formability of the anticorrosive tape.
Specifically, after applying compounds A to K on one surface of each m-aramid fiber substrate (substrate B described later, thickness is 0.3 mm to 1.5 mm) with a planar dimension of 15 cm × 15 cm , A laminate obtained by placing a release paper on the side coated with compounds A to K and placing a spacer with a thickness of 1.1 mm on the opposite side (each laminate coated with compounds A to K) was pressed under conditions of a temperature of 40° C. and a pressure of 1.5 MPa using a 30-ton press machine manufactured by Tester Sangyo Co., Ltd., and evaluated from the viewpoint of formability when the anticorrosion tape was formed.
The coatability of compounds A to K was evaluated according to the following criteria.

◯: The compound can be present in the base material in a sufficiently spread state by pressing for a relatively short time, and the compound can be sufficiently retained in the base material after press molding.
Δ: Although part of the compound easily flows out of the base material after press molding, the compound can be present in the base material in a sufficiently spread state by pressing for a relatively short time. Alternatively, the compound can be sufficiently retained in the substrate after press molding, even though it takes a relatively long time for the compound to be present in the substrate in a sufficiently spread state.
x: The base material is torn by the pressure of press molding.

The leveling properties of compounds A to K were evaluated by visually evaluating the smoothness of the base material surface when each anticorrosion tape obtained by applying compounds A to K was wound around a pipe.
Specifically, a 6A steel pipe arranged so that the length direction is parallel to the horizontal direction, and an anti-corrosion tape with a weight of 0.5 kg attached to the other end side (each anti-corrosion tape obtained by applying compounds A to K respectively) ) is prepared, one end of the anticorrosion tape is attached to the upper side of the 6A steel pipe, and with a load applied by a weight, the anticorrosion tape is The smoothness of the substrate surface when the tape was wound around the 6A steel pipe was visually evaluated.
The leveling properties of compounds A to K were evaluated according to the following criteria.

◯: The base material surface is visually smooth enough due to exudation of the compound from the base material.
Δ: The compound exudes from the base material, but the surface of the base material is not sufficiently smooth visually.
x: The compound exuded from the substrate is dripping down, and the surface of the substrate is visually not smooth. Alternatively, the compound does not exude from the base material, and the surface of the base material is not visually smooth.

Table 1 below shows the measurement results of viscosity at 23° C. and the evaluation results of surface drying properties, coating properties, and leveling properties of Compounds A to K.
In Table 1 below, the silicone compound A is the trade name "YF3057" manufactured by Momentive Performance Materials Japan, and the cross-linking agent A is the trade name "Silicate 45" manufactured by Tama Chemical Co., Ltd. .

<Base material>
Substrates A to H shown in Table 2 below were prepared as substrates on which compounds A to H were to be supported.
Next, the mass reduction rate after heat treatment at 300° C. for 24 hours was determined for base materials A to H. The results are shown in Table 2 below.
The mass reduction ratio after heat treatment at 300° C. for 24 hours was determined as follows.

(1) Measure the initial weights of substrates A to H.
(2) After exposing the substrates A to H for 24 hours in an oven whose internal temperature is adjusted to 300° C., the mass of the substrates A to H is measured.
(3) For Substrates A to H, the mass reduction ratio after exposure at 300° C. for 24 hours to the initial mass is calculated.

[Example 1]
By kneading Compound A shown in Table 1 above at 120 ° C. using a planetary mixer, the water content of Compound A is adjusted to 320 ppm, and then it is supported on Base Material B shown in Table 2 above. , an anticorrosion tape according to Example 1 was produced.
The water content of compound A was measured by Karl Fischer titration. The details of the measuring apparatus and measuring conditions are as follows.

- Measuring device: coulometric titration moisture measuring device (manufactured by Mitsubishi Chemical Analytic Tech, model CA-200), heating and vaporization device (manufactured by Mitsubishi Chemical Analytic Tech, model VA-200)
・Measurement conditions: Heat vaporization method (heated at 150°C)
・Anolyte: Aquamicron AKX (manufactured by Mitsubishi Chemical Corporation)
・ Catholyte: Aquamicron CXU (manufactured by Mitsubishi Chemical Corporation)

Further, the anticorrosion tape according to Example 1 was evaluated for tape workability, reworkability after treatment at 200° C., adhesion, and heat and corrosion resistance.

The tape processability was evaluated in the same manner as the compound coatability described above.
The evaluation results of tape processability are shown in Table 3 below.

The reworkability after treatment at 200° C. was evaluated as follows.
Specifically, first, a primer ("YF3807" manufactured by Momentive Performance Materials Japan Co., Ltd. as a main agent of primer) is applied to the entire surface of the blasting plate (planar size 7 cm × 15 cm, thickness: 3.2 mm). A primer containing "CE611" (tin-based catalyst) manufactured by Momentive Performance Materials Japan Co., Ltd. as a curing agent) was applied at 300 g / m ² to form a primer layer on the blast plate. Later, the entire area of the primer layer is covered with the anticorrosive tape so that an overlapping portion is generated (so that a doubled portion is generated), and a top coat is applied on the anticorrosive tape (as the main component (oil)) Shin-Etsu Chemical Co., Ltd. A top coat containing "KF96-50cp" manufactured by Momentive Performance Materials Japan Co., Ltd. as a catalyst and "CE611" (tin-based catalyst) manufactured by Momentive Performance Materials Japan Co., Ltd.) was applied at 200 g / m ² and 23±1° C.) for 24 hours to obtain an anti-corrosion structure on the blast plate.
Next, the test piece in which the anticorrosion structure was formed on the blast plate was placed in a thermostat at 200° C. and heated continuously for one month.
After one month, the state of the anti-corrosion structure on the blast plate was visually confirmed, and reworkability was evaluated by evaluating whether the anti-corrosion tape could be peeled off from the blast plate.
The reworkability was evaluated according to the following criteria.

○: The surface of the anticorrosion structure can maintain the state before heating, and the anticorrosion tape can be peeled off from the blasting plate.
Δ: Although the surface of the anticorrosion structure can maintain the state before heating, the anticorrosion tape cannot be peeled off from the blasting plate (the tape is torn off when peeled off).
x: The surface of the anti-corrosion structure was discolored to dark brown (the state before heating could not be maintained), and the anti-corrosion tape could not be peeled off from the blasting plate.

The reworkability evaluation results are shown in Table 3 below.

Adhesion is measured by placing a test piece in which the anticorrosive structure is formed on the blast plate in a constant temperature chamber at 200 ° C. and continuing to heat for one month, and then measuring the peel force of the anticorrosion tape from the blast plate. Evaluation was made with reference to the results.
The peel strength of the anticorrosion tape from the blast plate was measured as follows.

(1) A test piece having the anticorrosive structure formed on the blast plate is placed in a thermostatic chamber at 200° C. and heated for one month.
(2) The test piece is subjected to a tensile test to measure the peel force of the anticorrosion tape from the blast plate.

The tensile test was carried out using a tensile tester at room temperature (23±1° C.) at a peel rate of 300 mm/min as a 180° peel test.
Adhesion was evaluated according to the following criteria.

○: Measured value of 180 ° C peel test is 5 N / 20 mm or more
×: Measured value of 180 ° C. peel test is 3 N / 20 mm or less

The adhesion evaluation results are shown in Table 3 below.

The heat and corrosion resistance is measured by placing the specimen in which the anticorrosion structure is formed on the blast plate in a thermostat at 200 ° C. and continuing to heat for one month. A compliant 1000-hour salt spray test was performed, and the degree of rust generation on the test piece (more specifically, the blast plate) after the salt spray test was evaluated.
The degree of rust generation was evaluated based on the grades (A to E) shown in Table 11 of JIS K 2246:2018.
The heat and corrosion resistance was evaluated according to the following criteria.

○: Grade A shown in Table 11 of JIS K 2246: 2018
△: Grades B to D shown in Table 11 of JIS K 2246: 2018
×: Grade E shown in Table 11 of JIS K 2246: 2018

Table 3 below shows the evaluation results of the heat and corrosion resistance.

[Example 2]
An anticorrosion tape according to Example 2 was produced in the same manner as in Example 1, except that the moisture content of Compound A shown in Table 1 was adjusted to 290 ppm.
The water content of Compound A was adjusted by kneading Compound A after adjustment as described above at 120° C. using a planetary mixer.
The moisture content of Compound A was measured in the same manner as in Example 1.
The anticorrosion tape according to Example 2 was also evaluated for tape workability, reworkability after treatment at 200° C., adhesion, and heat and corrosion resistance.
These evaluation results are shown in Table 3 below.

[Example 3]
An anticorrosion tape according to Example 3 was produced in the same manner as in Example 1, except that the moisture content of Compound A shown in Table 1 was adjusted to 180 ppm.
The water content of Compound A was adjusted by kneading Compound A after adjustment as described above at 120° C. using a planetary mixer.
The moisture content of Compound A was measured in the same manner as in Example 1.
Also, the anticorrosion tape according to Example 3 was evaluated for tape workability, reworkability after treatment at 200° C., adhesion, and heat resistance and anticorrosion properties.
These evaluation results are shown in Table 3 below.

[Example 4]
An anticorrosion tape according to Example 4 was produced in the same manner as in Example 1, except that the moisture content of Compound A shown in Table 1 was adjusted to 140 ppm.
The water content of Compound A was adjusted by kneading Compound A after adjustment as described above at 120° C. using a planetary mixer.
The moisture content of Compound A was measured in the same manner as in Example 1.
The anticorrosion tape according to Example 4 was also evaluated for tape workability, reworkability after treatment at 200° C., adhesion, and heat and corrosion resistance.
These evaluation results are shown in Table 3 below.

[Example 5]
An anticorrosion tape according to Example 5 was produced in the same manner as in Example 1, except that the moisture content of Compound A shown in Table 1 was adjusted to 85 ppm.
The water content of Compound A was adjusted by kneading Compound A after adjustment as described above at 120° C. using a planetary mixer.
The moisture content of Compound A was measured in the same manner as in Example 1.
The anticorrosion tape according to Example 5 was also evaluated for tape processability, reworkability after treatment at 200° C., adhesion, and heat resistance and anticorrosion properties.
These evaluation results are shown in Table 3 below.

[Example 6]
An anticorrosion tape according to Example 6 was produced in the same manner as in Example 1, except that the moisture content of compound A shown in Table 1 was adjusted to 53 ppm.
The water content of Compound A was adjusted by kneading Compound A after adjustment as described above at 120° C. using a planetary mixer.
The moisture content of Compound A was measured in the same manner as in Example 1.
The anticorrosion tape according to Example 6 was also evaluated for tape workability, reworkability after treatment at 200° C., adhesion, and heat and corrosion resistance.
These evaluation results are shown in Table 3 below.

[Comparative Example 1]
Corrosion protection according to Comparative Example 1 was performed in the same manner as in Example 1 except that a compound with the trade name "Nito Harmac XG" manufactured by Nitto Denko Corporation was used as the compound, and the base material B shown in Table 2 above was used as the base material. A tape was made.
The anticorrosion tape according to Comparative Example 1 was evaluated for tape workability.
The evaluation results are shown in Table 3 below.

[Comparative Example 2]
An anticorrosion tape according to Comparative Example 2 was produced in the same manner as in Example 1, except that the moisture content of Compound A shown in Table 1 was adjusted to 1100 ppm.
The water content of Compound A was adjusted by kneading Compound A after adjustment as described above at 120° C. using a planetary mixer.
The moisture content of Compound A was measured in the same manner as in Example 1.
The anticorrosion tape according to Comparative Example 2 was also evaluated for tape processability, reworkability after treatment at 200° C., adhesion, and heat and corrosion resistance.
These evaluation results are shown in Table 3 below.

From Table 3, it was found that the anti-corrosion tapes according to each example were all rated ◯ in terms of tape processability, reworkability after treatment at 200°C, adhesion, and heat and corrosion resistance.
On the other hand, it was found that the anticorrosive tape according to each comparative example had one or more of the above items.

Next, anti-corrosion tapes produced by changing compound species were evaluated for tape workability, reworkability after treatment at 200° C., adhesion, and heat-resistant and anti-corrosion properties.

[Example 7]
After adjusting the moisture content of Compound B shown in Table 1 above to 100 ppm, it was supported on Base Material B shown in Table 2 above, thereby producing an anti-corrosion tape according to Example 7.
The water content of Compound B was adjusted by kneading Compound B prepared as described above at 120° C. using a planetary mixer.
The anticorrosion tape according to Example 7 was evaluated for tape workability, reworkability after treatment at 200° C., adhesion, and heat and corrosion resistance, and the results are shown in Table 4 below.

[Example 8]
An anticorrosion tape according to Example 8 was produced in the same manner as in Example 7, except that the water content of Compound C shown in Table 1 was adjusted to 100 ppm.
The water content of Compound C was adjusted by kneading Compound C adjusted as described above at 120° C. using a planetary mixer.
The anticorrosion tape according to Example 8 was evaluated for tape processability, reworkability after treatment at 200° C., adhesion, and heat and corrosion resistance, and the results are shown in Table 4 below.

[Example 9]
An anticorrosion tape according to Example 9 was produced in the same manner as in Example 7, except that the moisture content of compound D shown in Table 1 was adjusted to 100 ppm.
The water content of Compound D was adjusted by kneading Compound D adjusted as described above at 120° C. using a planetary mixer.
The anticorrosion tape according to Example 9 was evaluated for tape processability, reworkability after treatment at 200° C., adhesion, and heat resistance and anticorrosion properties, and the results are shown in Table 4 below.

[Example 10]
An anticorrosion tape according to Example 10 was produced in the same manner as in Example 7, except that the moisture content of Compound E shown in Table 1 was adjusted to 100 ppm.
The water content of Compound E was adjusted by kneading Compound E adjusted as described above at 120° C. using a planetary mixer.
The anticorrosion tape according to Example 10 was evaluated for tape workability, reworkability after treatment at 200° C., adhesion, and heat resistance and anticorrosion properties, and the results are shown in Table 4 below.

[Example 11]
An anticorrosion tape according to Example 11 was produced in the same manner as in Example 7, except that the water content of Compound F shown in Table 1 was adjusted to 100 ppm.
The water content of Compound F was adjusted by kneading Compound F adjusted as described above at 120° C. using a planetary mixer.
The anticorrosion tape according to Example 11 was evaluated for tape workability, reworkability after treatment at 200° C., adhesion, and heat and corrosion resistance, and the results are shown in Table 4 below.

[Example 12]
An anticorrosion tape according to Example 12 was produced in the same manner as in Example 7, except that the water content of Compound G shown in Table 1 was adjusted to 100 ppm.
The water content of Compound G was adjusted by kneading Compound G adjusted as described above at 120° C. using a planetary mixer.
The anticorrosion tape according to Example 12 was evaluated for tape processability, reworkability after treatment at 200° C., adhesion, and heat resistance and anticorrosion properties, and the results are shown in Table 4 below.

[Example 13]
An anticorrosion tape according to Example 13 was produced in the same manner as in Example 7, except that the moisture content of compound H shown in Table 1 was adjusted to 100 ppm.
The water content of Compound H was adjusted by kneading Compound H adjusted as described above at 120° C. using a planetary mixer.
The anticorrosion tape according to Example 13 was evaluated for tape processability, reworkability after treatment at 200° C., adhesion, and heat and corrosion resistance, and the results are shown in Table 4 below.

[Example 14]
An anticorrosion tape according to Example 14 was produced in the same manner as in Example 7, except that the water content of compound I shown in Table 1 was adjusted to 100 ppm.
The water content of Compound I was adjusted by kneading Compound I adjusted as described above at 120° C. using a planetary mixer.
The anticorrosion tape according to Example 14 was evaluated for tape workability, reworkability after treatment at 200° C., adhesion, and heat resistance and anticorrosion properties, and the results are shown in Table 4 below.

[Example 15]
An anticorrosion tape according to Example 15 was produced in the same manner as in Example 7, except that the water content of Compound J shown in Table 1 was adjusted to 100 ppm.
The water content of Compound J was adjusted by kneading Compound J adjusted as described above at 120° C. using a planetary mixer.
The anticorrosion tape according to Example 15 was evaluated for tape processability, reworkability after treatment at 200° C., adhesion, and heat resistance and anticorrosion properties, and the results are shown in Table 4 below.

[Example 16]
An anticorrosion tape according to Example 16 was produced in the same manner as in Example 7, except that the water content of compound K shown in Table 1 was adjusted to 100 ppm.
The water content of Compound K was adjusted by kneading Compound K adjusted as described above at 120° C. using a planetary mixer.
The anticorrosion tape according to Example 16 was evaluated for tape workability, reworkability after treatment at 200° C., adhesion, and heat resistance and anticorrosion properties, and the results are shown in Table 4 below.

From Table 4, it was found that the anticorrosion tapes according to each example had at least excellent reworkability after treatment at 200°C.

Next, the anticorrosion tapes produced by changing the type of base material were evaluated for tape workability, reworkability after treatment at 200° C., adhesion, and heat and corrosion resistance.

[Example 17]
An anticorrosion tape according to Example 17 was produced by adjusting the moisture content of compound A shown in Table 1 above to 100 ppm and then supporting it on base material A shown in Table 2 above.
The water content of Compound A was adjusted by kneading Compound A prepared as described above at 120° C. using a planetary mixer.
The anticorrosion tape according to Example 17 was evaluated for tape workability, reworkability after treatment at 200° C., adhesion, and heat resistance and anticorrosion properties, and the results are shown in Table 5 below.

[Example 18]
An anticorrosion tape according to Example 18 was produced in the same manner as in Example 17, except that the base material C shown in Table 2 was used as the base material.
The anticorrosion tape according to Example 18 was evaluated for tape workability, reworkability after treatment at 200° C., adhesion, and heat and corrosion resistance, and the results are shown in Table 5 below.

[Example 19]
An anticorrosion tape according to Example 19 was produced in the same manner as in Example 17, except that the base material D shown in Table 2 was used as the base material.
The anticorrosion tape according to Example 19 was evaluated for tape workability, reworkability after treatment at 200° C., adhesion, and heat and corrosion resistance, and the results are shown in Table 5 below.

[Example 20]
An anticorrosion tape according to Example 20 was produced in the same manner as in Example 17, except that the base material E shown in Table 2 was used as the base material.
The anticorrosion tape according to Example 20 was evaluated for tape workability, reworkability after treatment at 200° C., adhesion, and heat resistance and anticorrosion properties, and the results are shown in Table 5 below.

[Example 21]
An anticorrosion tape according to Example 21 was produced in the same manner as in Example 17, except that the base material F shown in Table 2 was used as the base material.
The anticorrosion tape according to Example 21 was evaluated for tape processability, reworkability after treatment at 200° C., adhesion, and heat and corrosion resistance, and the results are shown in Table 5 below.

[Example 22]
An anticorrosion tape according to Example 22 was produced in the same manner as in Example 17, except that the base material G shown in Table 2 was used as the base material.
The anticorrosion tape according to Example 22 was evaluated for tape workability, reworkability after treatment at 200° C., adhesion, and heat resistance and anticorrosion properties, and the results are shown in Table 5 below.

[Example 23]
An anticorrosion tape according to Example 23 was produced in the same manner as in Example 17, except that the base material H shown in Table 2 was used as the base material.
The anticorrosion tape according to Example 23 was evaluated for tape processability, reworkability after treatment at 200° C., adhesion, and heat and corrosion resistance, and the results are shown in Table 5 below.

From Table 5, it was found that the anticorrosive tapes according to each example were evaluated as Δ or higher in all of the items of tape workability, reworkability after treatment at 200° C., adhesion, and heat and corrosion resistance.

(top coat)
The catalyst, the main component (oil), the colorant, and the thickener were mixed at room temperature in the mass ratios shown in Table 6 below to obtain topcoats according to Examples 24 to 28, and Comparative Examples 3 and A top coat according to No. 4 was produced.
In Example 24, a tin-based catalyst "CE611" (manufactured by Momentive Performance Materials Japan Co., Ltd.) was used as the catalyst, and a silicone oil "KF96-50cp" (Shin-Etsu (manufactured by Kagaku Kogyo Co., Ltd.), and as a coloring agent, "Alpaste" (manufactured by Toyo Aluminum Co., Ltd.) was used.
In Example 25, the same catalyst, main component (oil), and colorant as in Example 24 were used, and "Aerosil 130" (manufactured by Nippon Aerosil Co., Ltd.) was used as the thickener.
In Example 26, the same catalyst, main component (oil), colorant, and thickener as in Example 25 were used.
In Example 27, the same catalyst, colorant, and thickener as in Example 25 were used, and as the main component (oil), silicone oil "KF96-1000cp" (manufactured by Shin-Etsu Chemical Co., Ltd.) was used. Using.
In Example 28, the same catalyst, main component (oil), colorant, and thickener as in Example 27 were used.
In Comparative Example 3, a water-based resin (acrylic emulsion resin) was used as the main component (oil), and carbon (BLACK FLTR CONC manufactured by Dainichiseika Kogyo Co., Ltd.) and titanium white (manufactured by Dainichiseika Kogyo Co., Ltd.) were used as colorants. TB807 Pearl) was used.
In Comparative Example 4, the same catalyst, main component (oil), colorant, and thickener as in Example 27 were used.

The viscosity at 23° C. was measured for the topcoat of each example.
The viscosity of the topcoat of each example at 23°C was measured using a BH viscometer manufactured by Tokimec under conditions of a temperature of 23 ± 1°C.
The number of the rotor to be used and the number of rotations of the rotor were selected according to the viscosity value V as follows.

・When V is 4 Pa·s or less (V≦4) Rotor number to be used: No. 2, rotor speed: 10 rpm
・When V exceeds 4 Pa·s and is 10 Pa·s or less (4<V≦10) Rotor number to be used: No. 3, rotor speed: 10 rpm
・When V exceeds 10 Pa·s and is 50 Pa·s or less (10<V≦50) Number of rotor to be used: No. 6, rotor speed: 20rpm
・When V exceeds 50 Pa·s and is 100 Pa·s or less (50<V≦100) Roller number to be used: No. 6, rotor speed: 10rpm

In addition, the tape curability, leveling properties, running properties, and dripping properties of the top coat according to each example were evaluated.

Regarding the curability of the tape, a primer ("YF3807" manufactured by Momentive Performance Materials Japan Co., Ltd. as the main agent of the primer was applied to the entire surface of the blast plate (planar size 7 cm x 15 cm, thickness: 3.2 mm). After forming a primer layer on the blast plate by applying 300 g / m ² of "CE611" (tin-based catalyst) manufactured by Momentive Performance Materials Japan Co., Ltd. as a curing agent) , The entire area of the primer layer is covered with an anticorrosion tape (anticorrosion tape according to Example 1 described above) so that an overlap occurs (so that a doubled portion occurs), and then, on the anticorrosion tape, each example After forming a top coat layer by applying the top coat of 200 g / m ² and curing for 24 hours at room temperature (23 ± 1 ° C.), it is visually checked whether the tapes are in close contact. evaluated by observation.
The curability of the tape was evaluated according to the following criteria.

◯: The tapes are in close contact with each other.
x: The tapes are not in close contact with each other.

The leveling property was evaluated by visually confirming the unevenness of the surface of the topcoat layer formed by applying the topcoat to the substrate. Evaluation was performed according to the following criteria.

◯: After application, unevenness disappears, the surface is smoothed, and the entire topcoat layer is sufficiently thin.
Δ: After application, unevenness is eliminated and the surface is smoothed, but some parts of the topcoat layer are not thinned.
x: Unevenness does not disappear after application, and the surface does not become smooth.

Regarding the runnability, when the topcoat is applied to the substrate using a brush, the operator visually observes how much resistance the operator feels and whether or not streaks are formed on the surface of the topcoat layer by the brush. It was evaluated by confirming with . Evaluation was performed according to the following criteria.

○: No streaks are formed on the surface of the topcoat layer by the brush, and the operator feels light resistance (i.e., the coatability is extremely good).
Δ: Although no streaks are formed on the surface of the topcoat layer by the brush, the operator feels a little heavy resistance (that is, the coatability is slightly good).
×: Streaks are formed on the surface of the topcoat layer by the brush, and the operator feels extremely heavy resistance (that is, the coating properties are considerably inferior).

The dripping/pooling property was evaluated by visually observing whether dripping or pooling occurred after the top coat was applied to the substrate. Evaluation was performed according to the following criteria.

◯: No dripping or pooling occurs after application.
Δ: No dripping occurs after application, but local pooling occurs.
x: The topcoat drips from the substrate after application.

Table 6 below shows the results of evaluation of tape curability, leveling properties, running properties, and dripping/pooling properties.

From Table 6, none of the top coats according to each example was evaluated as x in the items of tape curability, leveling property, running property, dripping/liquid pooling property, and permeability. .
On the other hand, all the top coats according to the comparative examples were evaluated as x in any item of tape curability, leveling property, running property, and dripping/liquid pooling property. .

(mastic)
The main component (oil), the inorganic filler, the weighting agent, and the flame retardant were mixed at room temperature in the mass ratios shown in Table 7 below, and the mastics according to Examples 29 to 31 and Comparative Example 5 were prepared. A mastic according to ~7 was made.
In Example 29, silicone oil "YF3057" (manufactured by Momentive Performance Materials Japan, hereinafter also referred to as silicone compound B) was used as the main component (oil), and pyrogenic silica was used as the inorganic filler. and calcium carbonate, silica balloon "Glass Bubbles K46" (manufactured by 3M) was used as a lightening agent, and aluminum hydroxide was used as a flame retardant.
In Example 30, Example 31, Comparative Example 6, and Comparative Example 7, the same main component (oil), inorganic filler, weighting agent, and flame retardant as in Example 25 were used.
In Comparative Example 5, isoprene (poly ip manufactured by Idemitsu Kosan Co., Ltd.) was used as the main component (oil), calcium carbonate was used as the inorganic filler, and aluminum hydroxide was used as the flame retardant.

The mass reduction rate and consistency were measured for the mastic according to each example.
In addition, the mastic according to each example was subjected to a slump test and evaluated for changes in apparent density.

The mass reduction rate was measured by determining the mass reduction rate after heat treatment at 300° C. for 24 hours.
The mass reduction rate after heat treatment at 300° C. for 24 hours was determined as follows.

(1) Measure the initial mass of the mastic according to each example.
(2) The mastic according to each example is placed in an oven whose internal temperature has been adjusted to 300° C., exposed for 24 hours, and then the mass of the mastic according to each example is measured.
(3) For the mastic according to each example, the ratio of mass reduction after exposure to 300° C. for 24 hours to the initial mass is calculated.

The results are shown in Table 7 below.

The consistency was measured at 23° C. based on JIS K2235-1991 “Petroleum wax 5.10 Consistency test method”.
The results are shown in Table 7 below.

The slump test was performed according to the following procedures.

(1) A mastic is molded into a rectangular parallelepiped shape (2.5 cm×10 cm in plan view and 2.5 cm in thickness).
(2) Two pieces of L-shaped steel are arranged so that one side faces each other with a gap of 50 mm (one side is arranged in the vertical direction), and two mastics are molded into a rectangular parallelepiped shape. It is placed so as to straddle both of the L-shaped steels.
(3) Measure how much the mastic sag after heating at 80° C. for 24 hours. The degree of sagging of the mastic is measured with reference to the upper edge of one surface of the L-shaped steel.

The results are shown in Table 7 below.

The change in apparent density was evaluated by determining the presence or absence of apparent density.
For the presence or absence of change in apparent density, the mastic placed on the test jig was photographed immediately after being placed and after being heated at 80° C. for 24 hours after being placed. Photographs were compared to visually determine whether or not the volume had changed.
Specifically, if the volume V2 after being heated at 80° C. for 24 hours after being placed is 2/3 or less of the volume V1 immediately after placement, it is determined that there is a change in volume. The volume of V2 was more than 2/3 of V1, and the volume was evaluated as "None" because there was no change in volume.
The results are shown in Table 7 below.

As can be seen from Table 7, the mastics according to each example showed no change in apparent density, and the slump test results were all good at 10 mm or less.
On the other hand, the mastic according to Comparative Example 5 had a good result of 10 mm or less in the slump test, but a change in apparent density was observed.
In addition, although the mastics according to Comparative Examples 6 and 7 did not show any change in apparent density, they could not be molded into specimens (planar dimensions: 2.5 cm x 10 cm, thickness: 2.5 cm) for performing the slump test. , could not even perform a slump test.

REFERENCE SIGNS LIST 1 primer layer 2 anticorrosion layer 3 topcoat layer 4 anticorrosion mastic layer 10 metal member 11 flange 12 bolt 13 nut 100 anticorrosion structure

Claims (12)

a fiber sheet;
a compound carried on the fiber sheet and containing a silicone compound;
The anticorrosion tape, wherein the water content of the compound is 1000 ppm or less. The anticorrosion tape according to claim 1, wherein the compound contains a reaction-curable silicone compound as the silicone compound, and has a viscosity of 25 Pa·s or more and 250 Pa·s or less at 23°C. The anticorrosion tape according to claim 1 or 2, wherein the fiber sheet has a mass reduction rate of 10% by mass or less after being heat-treated at 300°C for 24 hours. The anticorrosion tape according to any one of claims 1 to 3, wherein the fiber sheet has a basis weight of 30 g/ ^m2 or more and 150 g/ ^m2 or less. Equipped with an anti-corrosion layer formed by an anti-corrosion tape,
The anticorrosion tape has a fiber sheet and a compound supported on the fiber sheet and containing a silicone compound,
An anti-corrosion structure, wherein the compound has a moisture content of 1000 ppm or less. Further comprising a topcoat layer laminated on the anticorrosion layer,
The topcoat layer is formed of a topcoat containing oil,
The anticorrosion structure according to claim 5, wherein the oil contains a silicone compound. The anticorrosion structure according to claim 6, wherein the top coat has a viscosity of 0.05 Pa·s or more and 100 Pa·s or less at 23°C. The anticorrosion structure according to claim 6 or 7, wherein the topcoat further comprises a tin-based catalyst. It further comprises a primer layer interposed between the anticorrosion layer and an object and applied to the object, the primer layer being formed of a primer as an anticorrosion paste for anticorrosion of the object. ,
The anticorrosion structure according to any one of claims 5 to 8, wherein the primer layer contains a silicone compound. further comprising an anti-corrosion mastic layer disposed between the primer layer and the anti-corrosion layer and formed of an anti-corrosion mastic;
10. The anticorrosion structure of claim 9, wherein the anticorrosion mastic layer comprises a silicone compound. The anticorrosion structure according to claim 10, wherein the anticorrosion mastic has a consistency of 40 or more and 150 or less. The anti-corrosion structure according to claim 10 or 11, wherein the anti-corrosion mastic has a mass reduction rate of 20% by mass or less after heat treatment at 300°C for 24 hours.

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