JPH06256975A - Water repellent corrosion preventive layer and corrosion preventive treating material therefor - Google Patents

Abstract

PURPOSE:To enable the easy formation of the tough corrosion preventive layer having excellent water repellency, heat resistance and adhesion property on a work site at a low temp. by coating a metal, etc., with a cold cross-linking type coating material formed by impregnating a porous base material with a prescribed liquid intimate mixture. CONSTITUTION:The metallic surface, etc., are coated with the cold cross-linking type coating material. The water repellent corrosion preventive layer having <=35dyn/cm surface temp. is formed by cross-linking this coating layer with a coating liquid for cross-linking. The cold cross-linking type coating material mentioned above is formed by using uncross-linked liquid silicone rubber as an essential component and impregnating the porous base material with the liquid intimate mixture contg. a hardener, etc. The coating liquid for cross- linking mentioned above contains the uncross-linked liquid silicone rubber and/or silicone oil as essential components and contains either the hardener mentioned above or hardening catalyst.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water-repellent anticorrosive layer which can be easily applied at room temperature with good adhesion and is suitable for the anticorrosion treatment of metals, and its anticorrosion treatment material.

[0002]

2. Description of the Related Art Conventionally, there has been known an anticorrosion layer formed by lining a metal surface with hot-melt polyethylene or an epoxy resin by a heating coating method on a production line. However, the lining requires complicated processing operations and a large amount of heat, and the formed anticorrosion layer is easily damaged by external factors during storage and transportation, and the lining to the connection part of the anticorrosion parts, for example, the connection part of the pipeline There was a problem that it was difficult to process.

On the other hand, as an anticorrosion layer which can be formed by a cooling method which does not require a large amount of heat and is advantageous for on-site construction, a polymerized and cured film formed by coating a urethane resin or an epoxy resin on a metal surface has been known. However, it is difficult to form a uniform anticorrosion layer because the coating thickness varies, and in the case of a two-component type coating solution, the physical properties of the coating become uneven due to the variation of the mixing ratio, making it difficult to form a uniform anticorrosion layer. was there.

On the other hand, as an anticorrosion layer having good thickness and homogeneity, it is known that an anticorrosion tape having a pressure-sensitive adhesive layer provided on an anticorrosion substrate such as a film is wound or adhered on a metal surface. However, there is a problem that the anticorrosion tape is easily deformed due to the outside air temperature and the outside pressure, wrinkles and floats are likely to occur in the anticorrosion layer, and dust and dirt are easily attached and contaminated.

[0005]

DISCLOSURE OF THE INVENTION The present invention can be easily applied at a work site at a low temperature such as room temperature without requiring a complicated processing operation such as a lining processing and a large amount of heat, and can also process a connection portion of an anticorrosion component. Easy to use, the anticorrosive layer has excellent thickness and uniformity of physical properties, and it has a toughness that does not easily cause damage or deformation due to external factors. It is unlikely to cause wrinkles or floating, and is unlikely to be contaminated with dirt or dust. The task is to obtain an anticorrosion layer.

[0006]

DISCLOSURE OF THE INVENTION The present invention is a room temperature cross-linking type coating material obtained by impregnating a porous base material with a liquid mixture containing an uncross-linked liquid silicone rubber as a main component and containing either a curing agent or a curing catalyst. Is applied to the metal surface or the anticorrosion defect portion to form a coating layer, and the coating layer contains an uncrosslinked liquid silicone rubber and / or silicone oil as a main component and the other of the above-mentioned curing agent or curing catalyst. The present invention provides a water-repellent anticorrosive layer characterized by being cross-linked with a cross-linking coating liquid, and a water-repellent anti-corrosion treatment material comprising the above room temperature cross-linking type coating material and a cross-linking coating liquid. .

[0007]

The room-temperature cross-linking type coating material having the above-mentioned structure shows satisfactory wettability and deformability even when it is a rough surface or a curved surface with respect to the coating surface such as a metal surface through the contained liquid mixture. In close contact. In addition, the curing agent and curing catalyst can be separated for stable long-term storage, and the application of the cross-linking coating liquid allows it to penetrate into the coating layer of the room temperature cross-linking type coating material, and the uncross-linked liquid in the liquid mixture. The silicone rubber and the curing agent react under the action of a curing catalyst to crosslink at room temperature or the like, firmly bonding to a metal or the like and forming a tough water-repellent anticorrosion layer together with the porous substrate.

As a result of the above, an anticorrosion layer having excellent thickness and uniformity of physical properties can be easily formed at a work site at a low temperature, and a connecting portion such as a pipeline can be easily treated. In addition, since it is a curing mechanism that uses the crosslinking reaction of liquid silicone rubber, it is possible to avoid the involvement of harmful organic solvents during the formation of the anticorrosion layer, and to cure it in a tack-free state in a short time of about several hours to prevent dust and dirt. In addition to being less likely to be contaminated, the surface tension is also small, and water stains etc. are hard to adhere, and it maintains a glossy and excellent appearance. Furthermore, the formed anticorrosion layer is unlikely to be damaged or deformed due to external factors, and is unlikely to be wrinkled or floated, so that the water-repellent anticorrosion effect is maintained for a long time.

[0009]

EXAMPLES Room temperature crosslinkable coating materials used in the present invention are
A flexible porous substrate is impregnated with a liquid mixture containing an uncrosslinked liquid silicone rubber as a main component and one of a curing agent and a curing catalyst. The cross-linking coating liquid contains an uncross-linked liquid silicone rubber and / or silicone oil as a main component and contains the other of the above-mentioned curing agents or curing catalysts.

The liquid mixture contains an uncrosslinked liquid silicone rubber, that is, liquid polyorganosiloxane as a main component, contains a curing agent or a curing catalyst, and is cured by a condensation reaction type or addition reaction type curing mechanism to give a rubber-like mixture. It is a cured product.

The above-mentioned uncrosslinked liquid silicone rubber has a general unit formula: R _a SiO _{(4-a) / 2} (wherein R is a substituted or unsubstituted monovalent hydrocarbon group or hydroxyl group, and a is 1). ~
It is an integer of 3. A homopolymer, a copolymer, or a mixture thereof composed of the structural unit represented by the formula (1) can be used.

In the above formula, the substituted or unsubstituted monovalent hydrocarbon groups of the group R may be the same or different, for example, a methyl group, an ethyl group, a propyl group,
Alkyl groups such as butyl group, hexyl group, dodecyl group, alkenyl groups such as vinyl group, allyl group, aryl groups such as phenyl group, tolyl group, benzyl group, β-phenylethyl group, β-phenylpropyl group, etc. aralkyl Base, 3,
Examples thereof include monovalent substituted hydrocarbon groups such as 3,3-trifluoropropyl group and chloromethyl group, which are easy to synthesize an uncrosslinked liquid silicone rubber (liquid polyorganosiloxane) and a curing mechanism thereof. It can be appropriately selected depending on the fluidity of the composition and the physical properties of the cured product of the composition such as heat resistance.

The uncrosslinked liquid silicone rubber used is not particularly limited in its molecular structure as long as it is liquid at room temperature, and has a linear, branched, reticulated or slightly three-dimensional reticulated structure, or a mixture thereof. Although there is no problem even if it is in a state, the viscosity at 25 ° C is 100 to 10
50,000 cSt is preferable, and 1,000 to 5
It is more preferably 10,000 cSt.

When the viscosity is less than 100 cSt, it is difficult to impart excellent mechanical properties to the cured product of the composition, and when it exceeds 100,000 cSt, the composition is imparted with appropriate fluidity. I can't.

The liquid mixture can be prepared by mixing the uncrosslinked liquid silicone rubber with one of the curing agent and the curing catalyst. The curing agent reacts with the uncrosslinked liquid silicone rubber or the silicone oil which is the main component of the crosslinking coating liquid at a low temperature such as room temperature in the presence of a curing catalyst to form the uncrosslinked liquid silicone rubber or the silicone oil of the crosslinking coating liquid. It crosslinks.

The uncrosslinked liquid silicone rubber, the curing agent or the curing catalyst can be used in an appropriate combination so as to cure at a low temperature such as room temperature depending on the condensation reaction type or addition reaction type curing mechanism. .

By the way, in the case of a condensation reaction type liquid mixture, (a) a polyorganosiloxane having a molecular chain terminal blocked with a silanol group or an alkoxy group is used as the uncrosslinked liquid silicone rubber, and (b) silicon is used as a curing agent. An organosilicon compound having at least three hydrolyzable groups bonded to atoms in one molecule, or a curing catalyst is added.

Among the substituted or unsubstituted monovalent hydrocarbon groups bonded to the silicon atom in the polyorganosiloxane of the component (a), a methyl group, a vinyl group or a phenyl group is preferable from the viewpoint of easy synthesis. Furthermore, when the hydrocarbon group bonded to the silicon atom is a methyl group, the synthesis of the raw material intermediate is easier than in the case of other hydrocarbon groups, and the degree of polymerization of the resulting polymer is high. Has the lowest viscosity,
Further, it is most preferable because it has a favorable effect on the balance of the physical properties of the elastic body which is a cured product.

Therefore, it is most preferable that substantially all of them are methyl groups, but when the cured product is required to have heat resistance, a part of the hydrocarbon groups bonded to the silicon atom is a phenyl group. Is preferred. Even in the case of containing a hydrocarbon group other than a methyl group, it is preferable that 85% or more of the total number of hydrocarbon groups in the polymer is a methyl group, for the reason described above.

As the organosilicon compound as the component (b),
Any one may be used as long as it has at least three hydrolyzable groups bonded to a silicon atom in one molecule. For example, a silane compound or a partially hydrolyzed condensate thereof, a linear polyorganosiloxane or a cyclic poly Organosiloxanes can be used.

Examples of the hydrolyzable group bonded to the silicon atom in the organosilicon compound include an alkoxy group, an acyloxy group, an N, N-dialkylamino group, an N-alkylamide group, an N, N-dialkylaminoxy group and a ketoxime. Group, alkenoxy group and the like.

In addition to the above-mentioned hydrolyzable groups, the organic silicon compounds may have, in addition to the above-mentioned hydrolyzable groups, alkyl groups such as methyl group, ethyl group, propyl group and butyl group, alkenyl groups such as vinyl group and allyl group, and phenyl group. Or the like, a substituted or unsubstituted monovalent hydrocarbon group such as an aryl group, a 3,3,3-trifluoropropyl group, a haloalkyl group such as a chloromethyl group may be bonded.

The component (b) is preferably blended so that the hydrolyzable group bonded to the silicon atom is equivalent to or more than the silanol group or alkoxy group in the component (a). If the blending amount of the component (b) is too small, the condensation reaction of the component (a) will not proceed sufficiently.

On the other hand, as a curing catalyst for promoting the condensation reaction, a metal salt of an organic carboxylic acid, for example, a carboxylic acid such as acetic acid, octanoic acid, lauric acid, stearic acid, oleic acid, naphthenic acid or benzoic acid, Tin, zinc, lead,
Examples thereof include salts with metals such as iron, antimony, barium, titanium and manganese.

In addition to the above, for example, organic tin compounds such as dibutyltin diacetate, dibutyltin dioctoate, dibutyltin dilaurate, dimethyltin oleate hydroxide, dibutyltin oleate, diphenyltin diacetate, dibutyltin oxide, dibutyltin dimethoxide; Organic titanate esters such as propyl titanate, tetrabutyl titanate, tetraoctyl titanate, diisopropoxy (acetylacetonato) titanium, diisopropylbis (ethylacetoacetato) titanium, 1,3-propylenedioxybis (acetylacetonato) Other examples include organic metal compounds such as titanium chelate compounds such as titanium and 1,3-propylenedioxybis (ethylacetoacetato) titanium.

In the case of such a condensation reaction type liquid mixture, the uncrosslinked liquid silicone rubber is exposed to moisture in the air in the presence of a curing agent and a curing catalyst (which may be unnecessary in some cases). It is hydrolyzed, the crosslinking reaction proceeds, and it is cured into a rubber.

On the other hand, in the case of an addition reaction type liquid mixture,
As the uncrosslinked liquid silicone rubber, (c) a polyorganosiloxane having at least two alkenyl groups bonded to silicon atoms in one molecule is used, and (d) an organohydrogensilane or polyorganohydrogensiloxane as a curing agent, or addition. A curing catalyst for the reaction is added. Further, when it is desired to obtain a gelled product by curing, a polyorganosiloxane having one alkenyl group bonded to a silicon atom in one molecule can be used in combination as the component (c).

Examples of the alkenyl group contained in the component (c) polyorganosiloxane include a vinyl group,
An allyl group, a 1-butenyl group, a 1-hexenyl group and the like can be mentioned, and a vinyl group is preferable from the viewpoint of easy synthesis.

The substituted or unsubstituted monovalent hydrocarbon group which can be bonded to other than the alkenyl group is as described above, but the ease of synthesis, the fluidity of the composition, and the cured product obtained from the composition are The methyl group is most preferred because it can be polymerized to the extent that good physical properties can be maintained.

Examples of the organic machine capable of binding to a silicon atom in the organohydrogensilane or polyorganohydrogensiloxane of the component (d) include those similar to the above-mentioned substituted or unsubstituted monovalent hydrocarbon group. However, a methyl group is preferable in terms of ease of synthesis.

As the component (d), a polyorganohydrogensiloxane having an average of more than 2 hydrogen atoms bonded to silicon atoms in one molecule is preferable. As the polyorganohydrogensiloxane, any of linear, branched, cyclic and the like may be used, and a mixture thereof may be used, but the composition itself after curing has good physical properties. In terms of doing
It is preferable to use the compounds shown by C or a mixture thereof.

B. A branched polyorganohydrogensiloxane composed of (CH ₃ ) ₂ HSiO _1/2 and SiO _1/2 units and having a hydrogen atom content bonded to a silicon atom of 0.3 to 1.2% by weight based on the molecular weight.

B. The following formula: (Where p is an integer of 2 to 100 and q is an integer of 0 to 100), and the content of hydrogen atoms bonded to silicon atoms is 0.5 to 1.6 wt% of the molecular weight. Polyorganohydrogen siloxane.

C. The following formula: (However, p is an integer of 1 to 100 and q is an integer of 0 to 100.), and the content of hydrogen atoms bonded to silicon atoms is 0.5 to 1.6% by weight of the molecular weight. Polyorganohydrogen siloxane.

The amount of the component (d) blended is such that the number of hydrogen atoms bonded to silicon atoms in the component (c) is 0.5 to 4.0 with respect to one alkenyl group in the component (c). The amount is preferably 1.0 to 3.0. If the number of hydrogen atoms is less than 0.5, curing of the composition will not proceed sufficiently, and the hardness of the cured product of the composition will be low, and if it exceeds 4.0, the physical properties of the cured product of the composition will be poor. descend.

On the other hand, as a curing catalyst for addition reaction,
A catalyst that promotes the addition reaction between the alkenyl group of the component (c) and the hydrosilyl group of the component (d) is used, and examples thereof include platinum-based, rhodium-based, and palladium-based catalysts. Above all, a platinum-based catalyst is preferably used,
Examples thereof include simple substance of platinum, chloroplatinic acid, platinum-olefin complex, platinum-alcohol complex, platinum coordination compound and the like.

In the case of such an addition reaction type liquid mixture, the uncrosslinked liquid silicone rubber undergoes a hydrosilylation reaction in the presence of a curing agent and a curing catalyst, and this becomes a crosslinking reaction to cure into a rubber-like state.

On the other hand, the cross-linking coating liquid can be prepared by mixing the uncross-linked liquid silicone rubber and / or silicone oil, and the curing agent and the curing catalyst, which have not been added to the liquid mixture. . As the uncrosslinked liquid silicone rubber for preparing the coating liquid for crosslinking, those based on the liquid mixture can be used.

As the silicone oil, those having a functional group capable of reacting with a curing agent at a low temperature such as room temperature in the presence of a curing catalyst, and liquid polyorganosiloxane having no functional group are used. Examples of the silicone oil composed of a liquid polyorganosiloxane having no functional group include polydimethylsiloxane or polymethylphenylsiloxane end-capped with a trimethylsiloxy group.

Therefore, as the uncrosslinked liquid silicone rubber or silicone oil, the curing agent or the curing catalyst used in the preparation of the coating liquid for crosslinking, a liquid mixture such as a condensation reaction type or an addition reaction type is mixed so that it can be cured at a low temperature such as room temperature. An appropriate combination can be selected according to the curing mechanism of the product.

The amount of the curing agent used is generally 0.01 to 20 parts by weight, especially 0.1 to 10 parts by weight, per 100 parts by weight of the uncrosslinked liquid silicone rubber (and / or silicone oil). The amount of the curing catalyst used is generally 0.01 to 10 parts by weight per 100 parts by weight of the uncrosslinked liquid silicone rubber (and / or silicone oil). The surface tension is 35 dyn / cm from the viewpoint of maintaining the appearance of the anticorrosion layer.
The following anticorrosion layer is preferably formed.

When preparing the liquid mixture and the coating liquid for crosslinking, for example, a filler, a plasticizer, an antiaging agent, a rust preventive, an antimold agent, an antioxidant, an ultraviolet absorber, an ozone deterioration inhibitor,
Thickeners and compounding agents such as thixotropic agents and pigments and colorants can be appropriately added as needed. The compounding amount thereof is generally 1 to 90% by weight of the preparation.

The liquid mixture to be prepared preferably has a viscosity such that it does not drip when impregnated into a porous substrate. The viscosity of the cross-linking coating liquid is preferably about 0.01 to 1000 poise (25 ° C.) from the viewpoints of coating properties and penetration into the room temperature cross-linking type coating material. Further, from the point of forming a uniform anticorrosion layer by making the applied amount of the crosslinking coating liquid as constant as possible, it is possible to determine the applied amount based on the color of the crosslinking coating liquid by blending a pigment or a coloring agent. It is preferable to do so.

The room temperature crosslinkable coating material can be obtained by impregnating a porous base material with a liquid mixture. The porous base material is a holding material for the liquid mixture, an auxiliary material for the work when winding or adhering the room temperature cross-linking coating material, a material for adjusting the thickness of the anticorrosion layer, a leveling material, impact mitigation and damage prevention. It also functions as a protective material for the anticorrosion layer for preventing deterioration due to light blocking. Therefore, as the porous base material, an appropriate material such as woven cloth, non-woven cloth, and felt made of various fibers can be used. The room temperature cross-linking type covering material can be formed into an appropriate form such as a tape, a sheet, or a section.

To form the water-repellent anticorrosion layer of the present invention, a room temperature cross-linking coating material is applied to a metal surface or an anticorrosion defect portion such as a defect portion of the anticorrosion layer by an appropriate method such as a winding method or an attaching method It can be carried out by crosslinking the coating layer with a crosslinking coating liquid. The crosslinking can be carried out at a low temperature such as room temperature by combining the room temperature crosslinkable coating material and the crosslinking coating liquid.

Therefore, the above-mentioned cross-linking is carried out by applying a cross-linking coating solution to a metal surface or the like in advance and then applying a room-temperature cross-linking type coating material thereon. Appropriate methods such as a method of coating on a metal surface, a method of coating a room temperature cross-linking type coating material on a metal surface and the like and applying a cross-linking coating liquid to the coating layer, or a combination thereof. You can From the viewpoints of surface smoothness and freedom of coating application time of the room temperature cross-linking type coating material, it is preferable to coat the room temperature cross-linking type coating material on the metal surface or the like and then apply the cross-linking coating liquid. Upon crosslinking, the crosslinking rate can be increased by heating the coating layer of the room temperature crosslinking type coating material with a burner or the like.

Example 1 100 parts of uncrosslinked liquid silicone rubber (parts by weight, the same applies hereinafter), 100 parts of white carbon (reinforcing agent), and 5 parts of tetraethoxysilane (curing agent) were kneaded in a planetary mixer, and the resulting mixture was blended with polyester. Non-woven fabric (Basis weight 100g /
m ² ), impregnate it into a roll and roll it up to 100 mm
It was cut into widths to obtain a room temperature cross-linking type coating material having a basis weight of 1 kg / m ² .

On the other hand, uncrosslinked liquid silicone rubber 100
Parts, white carbon 30 parts, aluminum powder (colorant) 10 parts, and dibutyltin dilaurate (curing catalyst) 5 parts were kneaded with a planetary mixer to obtain a colored crosslinking coating solution.

Next, the length of the room temperature cross-linking coating material is 1
Cut a sample of 50mm and make it 100mm wide and 1 long
It is adhered to a steel plate surface having a thickness of 50 mm and a thickness of 2 mm, and the coloring type crosslinking coating solution is applied thereon at a rate of 100 g / m ² , 23
It was kept at ℃ for 24 hours and cured at room temperature to form a water-repellent anticorrosion layer. Make a grid-like cut in the water-repellent anticorrosion layer,
When tested in accordance with JIS K 5400, the evaluation score was 10 (out of 10).

On the other hand, the above room temperature cross-linking type covering material is 50 mm wide.
To form a tape, which is wound around a steel pipe having a diameter of 100 mm with a wrap margin of 55%, and then the above-mentioned coloring type crosslinking coating solution is applied at a rate of 100 g / m ² at 23 ° C. It was kept for 24 hours and cured at room temperature to form a water-repellent anticorrosion layer. At that time, 4 hours (23
The surface becomes tack-free at (° C), and the surface tension when tack-free is 27 dyn / cm (JIS K 6768)
Met.

When the water-repellent anticorrosion layer was evaluated for water tightness, good results were obtained, and when the water-repellent anticorrosion layer on the steel pipe was cut and forcibly peeled off, the superposed portion was observed. The stepped portion of the portion was also filled with certainty, and no hole portion to be a water channel was formed.

Example 2 100 parts of uncrosslinked liquid silicone rubber, 100 parts of white carbon, and 5 parts of dibutyltin dilaurate were kneaded with a planetary mixer, and the resulting mixture was made into a polyester non-woven fabric (unit weight 10
0 g / m ² ) and then roll it up to 1
It was cut into a width of 00 mm to obtain a room temperature cross-linking type coating material having a basis weight of 1 kg / m ² .

On the other hand, 100 parts of silicone oil, 30 parts of white carbon, 10 parts of aluminum powder (colorant),
5 parts of tetraethoxysilane was kneaded with a planetary mixer to obtain a colored crosslinking coating liquid.

A water-repellent anticorrosive layer was formed in accordance with Example 1 using the above-mentioned room temperature crosslinkable coating material and the colored crosslinkable coating liquid, and its characteristics were examined. In addition to obtaining 10 points in the cross-cut test, 6 hours (23 ° C) after the application of the colored crosslinking solution
The surface became tack free, and the surface tension when tack free was 26 dyn / cm. Further, the watertightness was also good, and no pores to be water channels were formed.

[0055]

EFFECTS OF THE INVENTION According to the present invention, an anticorrosion layer which is a silicone-based toughness reinforced by a base material without the involvement of an organic solvent and is excellent in water repellency, corrosion resistance, heat resistance, thickness and physical property uniformity, and adhesion. Can be easily and efficiently formed at a work site by low-temperature construction. In addition, the formed anticorrosion layer is unlikely to cause contamination, damage, wrinkles or floating, and has an excellent long-term anticorrosion effect.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI technical display location B32B 25/20 F16L 58/10 (72) Inventor Naoki Miwa 1-1-1 Shimohozumi, Ibaraki-shi, Osaka No. 2 Nitto Denko Corporation (72) Inventor Tetsuo Fujimoto 6-23-1, Roppongi, Minato-ku, Tokyo Toshiba Silicon Corporation (72) Inventor Shuji Chiba 6-2-131, Roppongi, Minato-ku, Tokyo Toshiba Inside Silicone Co., Ltd.

Claims (5)

[Claims] 1. A room temperature crosslinkable coating material obtained by impregnating a porous base material with a liquid mixture containing an uncrosslinked liquid silicone rubber as a main component and containing either a curing agent or a curing catalyst on a metal surface or an anticorrosion defect portion. Coating was applied to form a coating layer, and the coating layer was crosslinked with a crosslinking coating liquid containing an uncrosslinked liquid silicone rubber and / or silicone oil as a main component and the other of the above-mentioned curing agent or curing catalyst. A water-repellent anticorrosion layer characterized by the above. 2. The water-repellent anticorrosion layer according to claim 1, which has a surface tension of 35 dyn / cm or less. 3. The water-repellent anticorrosive layer according to claim 1, which is colored by cross-linking with a cross-linking coating liquid in which a colorant is added onto a coating layer made of a room-temperature cross-linking type coating material. 4. A room-temperature cross-linking type coating material obtained by impregnating a porous base material with a liquid mixture containing an uncrosslinked liquid silicone rubber as a main component and containing either a curing agent or a curing catalyst, an uncrosslinked liquid silicone rubber, and And / or a cross-linking coating liquid containing silicone oil as a main component and the other of the above-mentioned curing agents or curing catalysts. 5. The cross-linking coating liquid contains a colorant.
The water-repellent anticorrosion treatment material according to.