Corrosion protection structure and method of manufacturing the same

Abstract

The present invention provides an anticorrosion structure with high anticorrosion effect and a manufacturing method thereof. The present invention relates to an anticorrosion structure (6) and a manufacturing method thereof, the anticorrosion structure (6) having at least one of a metal bolt (2) and a metal nut (3), and an anticorrosion member (1) that covers a portion protruding from a joint surface (50) of a joint portion of at least one of the bolt and the nut, the anticorrosion member (1) being composed of silicone rubber cured from a silicone rubber compound.

Description

[0001] [CROSS-REFERENCE TO RELATED APPLICATIONS]

[0002] This application claims priority based on Japanese Patent Application No. 2020-118259 filed on July 9, 2020, the content of which is incorporated herein by reference. In addition, the content described in the patents, patent applications, and documents cited in this application is incorporated into the present specification. TECHNICAL FIELD

[0003] The present application relates to an anticorrosion structure and a method for manufacturing the same. BACKGROUND

[0004] Conventionally, a method of joining members using a bolt and a nut has been adopted in various structures. Generally, in the case of joining a bolt and a nut, since the threaded portion of the bolt and the nut are in a state of protruding from the joint surface, they are easily exposed to rain and wind, and there is a problem that rusting easily occurs. As a countermeasure against corrosion of the bolt and the nut, a method of applying anticorrosive coating to the bolt and the nut is performed. However, since the bolt and the nut form a complex structure, there is a problem that rainwater that has infiltrated from the gap is difficult to escape and the anticorrosive effect is lost in a short period of time. Therefore, as a countermeasure against corrosion of the bolt and the nut instead of anticorrosive coating, a method of covering the joint portion of the bolt and the nut with a resin-made anticorrosion member (cap) is known (for example, refer to Patent Document 1 and Patent Document 2).

[0005] PRIOR ART DOCUMENTS

[0006] PATENT DOCUMENTS

[0007] Patent Document 1: Japanese Patent Application Laid-Open No. 2-138488

[0008] Patent Document 2: Japanese Patent Application Laid-Open No. 2002-227819 SUMMARY

[0009] (PROBLEMS TO BE SOLVED BY THE INVENTION)

[0010] However, such an anticorrosion member is generally mostly made of a resin such as vinyl chloride or an epoxy resin. Therefore, in an anticorrosion structure provided with the above-described anticorrosion member at the joint portion of at least one of a metal-made bolt and a metal-made nut, the anticorrosion member is likely to develop cracks or cracks due to deterioration over time, or the anticorrosion member is likely to float up, and in the case where it is left in this state, the anticorrosion effect can be reduced. Therefore, an anticorrosion structure with high anticorrosion effect is desired.

[0011] The present application was made in view of the above-described problems, and aims to provide an anticorrosion structure with high anticorrosion effect and a method for manufacturing the same.

[0012] (TECHNICAL SOLUTION TO THE PROBLEMS)

[0013] (1) An anticorrosion structure according to an embodiment for achieving the above object is provided with at least one of a metal bolt and a metal nut, and an anticorrosion member that covers a portion protruding from a joint surface of a joint portion using at least one of the bolt and the nut, the anticorrosion member being composed of silicone rubber cured from a silicone rubber compound.

[0014] (2) In an anticorrosion structure according to another embodiment, the anticorrosion member is preferably a layer composed of silicone rubber, and is provided with a coating layer that covers the joint surface.

[0015] (3) In an anticorrosion structure according to another embodiment, the coating layer is preferably provided with an adhesive layer at least on the side of the joint surface.

[0016] (4) In an anticorrosion structure according to another embodiment, the coating layer is preferably composed of the silicone rubber cured from a silicone rubber compound having a plasticity of 100 to 600.

[0017] (5) In an anticorrosion structure according to another embodiment, the anticorrosion member is preferably composed of the silicone rubber cured from the silicone rubber compound having a plasticity of 100 to 400.

[0018] (6) A method for manufacturing an anticorrosion structure according to an embodiment is a method for manufacturing any of the anticorrosion structures described above, and includes a coating step of covering a portion protruding from a joint surface of a joint portion using at least one of a metal bolt and a metal nut with a silicone rubber compound, and a curing step of curing the silicone rubber compound.

[0019] (7) In a method for manufacturing an anticorrosion structure according to another embodiment, in the coating step, a molding die that covers the portion protruding from the joint surface of the joint portion is put on a state in which the silicone rubber compound is supplied to the portion protruding from the joint surface of the joint portion, and the portion protruding from the joint surface of the joint portion is covered with the silicone rubber compound.

[0020] (8) In a method for manufacturing an anticorrosion structure according to another embodiment, in the coating step, the molding die is composed of an inner die that covers the portion protruding from the joint surface of the joint portion and is separable into two or more, and an outer die that covers the inner die.

[0021] (9) In the method for manufacturing the corrosion protection structure according to the embodiment, the method preferably further includes a coating layer forming step of covering the joint surface with a silicone rubber to form a coating layer.

[0022] (12) In the method for manufacturing the corrosion protection structure according to the embodiment, in the coating layer forming step, the joint surface is preferably covered with a silicone rubber sheet having an adhesive layer so that the adhesive layer is arranged at least on the joint surface side, thereby forming the coating layer.

[0023] (EFFECTS OF INVENTION)

[0024] According to the present application, a corrosion protection structure having high corrosion protection effect and a method for manufacturing the same can be provided. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 FIG. 1 is a longitudinal sectional view showing a corrosion protection structure according to a first embodiment.

[0026] Figure 2 FIG. 2 is a longitudinal sectional view showing a corrosion protection structure according to a second embodiment.

[0027] Figure 3 FIG. 3 is a flowchart showing main steps of a method for manufacturing a corrosion protection structure according to the first and second embodiments.

[0028] Figure 4 FIG. 4 is a view for explaining manufacturing steps of the corrosion protection structure according to the first embodiment.

[0029] Figure 5 FIG. 5 is a view for explaining manufacturing steps of the corrosion protection structure according to the first embodiment.

[0030] Figure 6 FIG. 6 is a view for explaining manufacturing steps of the corrosion protection structure according to the first embodiment.

[0031] Figure 7 FIG. 7 is a view for explaining manufacturing steps of the corrosion protection structure according to the first embodiment.

[0032] Figure 8 FIG. 8 is a view for explaining manufacturing steps of the corrosion protection structure according to the second embodiment.

[0033] Figure 9 FIG. 9 is a view for explaining manufacturing steps of the corrosion protection structure according to the second embodiment.

[0034] Figure 10 FIG. 10 is a view for explaining manufacturing steps of the corrosion protection structure according to the second embodiment.

[0035] Figure 11 FIG. 1 is a view for explaining a manufacturing process of an anticorrosion structure according to the second embodiment.

[0036] Figure 12 FIG. 2 is a flowchart showing main processes of a manufacturing method of an anticorrosion structure according to the third and fourth embodiments.

[0037] Figure 13 FIG. 3 is a view for explaining a manufacturing process of an anticorrosion structure according to the third embodiment.

[0038] Figure 14 FIG. 4 is a view for explaining a manufacturing process of an anticorrosion structure according to the third embodiment.

[0039] Figure 15 FIG. 5 is a view for explaining a manufacturing process of an anticorrosion structure according to the third embodiment.

[0040] Figure 16 FIG. 6 is a view for explaining a manufacturing process of an anticorrosion structure according to the third embodiment.

[0041] Figure 17 FIG. 7 is a view for explaining a manufacturing process of an anticorrosion structure according to the fourth embodiment.

[0042] Figure 18 FIG. 8 is a view for explaining a manufacturing process of an anticorrosion structure according to the fourth embodiment.

[0043] Figure 19 FIG. 9 is a view for explaining a manufacturing process of an anticorrosion structure according to the fourth embodiment.

[0044] Figure 20 FIG. 10 is a view for explaining a manufacturing process of an anticorrosion structure according to the fourth embodiment.

[0045] Symbol explanation

[0046] 1, 1a... anticorrosion member, 2... bolt, 3... nut, 6, 6a... anticorrosion structure, 20, 20a... coating layer, 22... adhesive layer, 50... joint surface, 60... inner mold, 70... outer mold, 80... molding mold, 84... opening, 86... piston. DETAILED DESCRIPTION

[0047] Hereinafter, embodiments of the present application will be described with reference to the accompanying drawings. Note that the embodiments described below do not limit the scope of the invention according to the patent claims. In addition, not all of the elements and combinations thereof described in the embodiments are essential to the solution means of the present application.

[0048] 1. Corrosion protection structure

[0049] (First embodiment)

[0050] Figure 1 A longitudinal sectional view of a corrosion protection structure involved in the first embodiment is shown. Here, the "longitudinal sectional view" means a view obtained by vertically cutting from the leg portion of the bolt toward the nut. The same applies to each of the embodiments hereinafter.

[0051] (1) Outline structure

[0052] The corrosion protection structure 6 involved in this embodiment has at least one of a metal bolt 2 and a metal nut 3, and a corrosion protection member 1 that covers a portion protruding from a joint surface 50 of a joint portion of a combination of at least one of the bolt 2 and the nut 3. Here, the metal means a metal without particular limitation such as iron, iron-based alloy (including SUS), and the like. The corrosion protection member 1 has a main body portion 10 composed of silicone rubber cured from a silicone rubber compound. In addition, the corrosion protection member 1 is preferably a layer composed of silicone rubber, and has a coating layer 20 that covers the joint surface 50. In this embodiment, the corrosion protection member 1 covers a portion protruding from the joint surface 50 of the joint portion of the combination of the bolt 2 and the nut 3 with respect to a structure 5. Hereinafter, elements constituting the corrosion protection member 1 included in the corrosion protection structure 6 will be described in detail.

[0053] (2) Main body portion

[0054] The main body portion 10 is a member that covers a portion protruding from the joint surface 50 of the joint portion of the combination of the bolt 2 and the nut 3. The main body portion 10 has: a recess portion 12 in which the portion protruding from the joint surface 50 of the joint portion is disposed. The main body portion 10 has, for example: a head portion 10a that covers a threaded portion (leg portion) of the bolt 2 protruding from the nut 3; a main body portion 10b that covers a side surface portion of the nut 3; and a flange portion 10c that covers a gasket 4 disposed between the nut 3 and the joint surface 50. In addition, the main body portion 10 is preferably formed in a shape corresponding to a shape of a member (the threaded portion of the bolt 2, the nut 3, the gasket 4, and the like) disposed in the recess portion 12. In addition, the shape of the main body portion 10 and the recess portion 12 is not limited to the shape shown in the drawing, and is preferably appropriately designed in accordance with the shape of the member disposed in the recess portion 12. For example, in a case where the gasket 4 is not used in the joint portion, the flange portion 10c can not be provided. Figure 1

[0055] (2-1) Silicone rubber

[0056] ​The silicone rubber is an elastomer in the form of rubber having siloxane bonds (-Si-O-Si) in a main skeleton. The silicone rubber that can be used in the present embodiment can be a silicone rubber obtained in any curing type such as an addition-curing type, a condensation-reaction type, a UV-curing type, an electron beam-curing type, and the like, and an addition-curing type silicone rubber is particularly preferable. The silicone rubber is an elastomer in the form of rubber obtained by curing a curable organopolysiloxane composition (silicone rubber compound) containing an organopolysiloxane as a main agent. Here, the "main agent" means an agent having the largest mass ratio among the components constituting the curable organopolysiloxane composition. The organopolysiloxane is preferably contained in the curable organopolysiloxane composition at 50% by mass or more, but can be less than 50% by mass if it is the main agent. Hereinafter, as a raw material before curing of the silicone rubber, i.e., a silicone rubber compound, one example of the curable organopolysiloxane composition of the addition-curing type and the condensation-reaction type will be described.

[0057] (addition-curing type)

[0058] The curable organopolysiloxane composition of the addition-curing type can also be referred to as a curable silicone composition of the addition-curing type or a curable silicone rubber composition of the addition-curing type. The curable organopolysiloxane composition of the addition-curing type can be composed mainly of the following components, for example.

[0059] (2-1-1) Organopolysiloxane

[0060] The organopolysiloxane is a main agent of the curable organopolysiloxane composition of the addition-curing type and has an average of two or more alkenyl groups in one molecule. The organopolysiloxane is a base polymer of the curable organopolysiloxane composition of the addition-curing type and is represented by the following average composition formula (I).

[0061] R 3 a SiO (4 -a) / 2...(I)

[0062] In formula (I), R 3 is an unsubstituted or substituted monovalent hydrocarbon group having 1 to 12 carbon atoms, preferably 1 to 10, and more preferably 1 to 8, which can be the same or different from each other, and a is a positive number in the range of 1.5 to 2.8, preferably 1.8 to 2.5, and more preferably 1.95 to 2.05.

[0063] Examples of alkenyl groups include vinyl, allyl, butenyl, pentenyl, hexenyl, and heptenyl. Vinyl is preferred. Additionally, examples of organic groups other than alkenyl groups bonded to silicon atoms in the main component include alkyl groups (methyl, ethyl, propyl, butyl, pentenyl, hexyl, etc.), aryl groups (phenyl, tolyl, xylyl, etc.), and haloalkyl groups (3-chloropropyl, 3,3,3-trifluoropropyl, etc.). Methyl is preferred. Examples of molecular structures for the main component include linear, partially branched linear, branched, network, and dendritic structures.

[0064] As the main component, organopolysiloxanes, for example, can be polydimethylsiloxanes whose molecular chains are capped at both ends by dimethylvinylsiloxy groups, dimethylsiloxane-methylvinylsiloxane copolymers whose molecular chains are capped at both ends by dimethylvinylsiloxy groups, dimethylsiloxane-methylvinylsiloxane copolymers whose molecular chains are capped at both ends by trimethylsiloxy groups, and (CH3)3SiO 1 / 2 The siloxane unit shown and (CH3)2(CH2=CH)SiO 1 / 2 The siloxane unit and SiO shown 4 / 2 Organopolysiloxanes composed of siloxane units as shown, organopolysiloxanes obtained by substituting at least a portion of the methyl groups of these organopolysiloxanes with substituents selected from alkyl (ethyl, propyl, etc.), aryl (phenyl, tolyl, etc.), haloalkyl (3,3,3-trifluoropropyl, etc.), organopolysiloxanes obtained by substituting at least a portion of the vinyl groups of these organopolysiloxanes with alkenyl (allyl, propenyl, etc.), and mixtures of two or more of these organopolysiloxanes.

[0065] (2-1-2) Hydrogenated organopolysiloxane

[0066] Hydrogenated organopolysiloxanes function as curing agents in addition-curing type curable organopolysiloxane compositions, having an average of two or more hydrogen atoms bonded to silicon atoms in one molecule. Hydrogenated organopolysiloxanes are also called organohydrogenated polysiloxanes. Preferably, the hydrogenated organopolysiloxane is represented by the following average compositional formula (II), having at least two, preferably three or more, more preferably three to 100, and even more preferably four to 50 hydrogen atoms bonded to silicon atoms (SiH groups) in one molecule.

[0067] R 4 b H c SiO (4 -bc) / 2...(II)

[0068] In chemical formula (II), R 4which are the same as or different from each other, are unsubstituted or substituted monovalent hydrocarbon groups having a carbon number of 1 to 12, preferably 1 to 10, and more preferably 1 to 8. In addition, b is 0.7 to 2.1, c is 0.001 to 1.0, and b + c is a positive number satisfying 0.8 to 3.0.

[0069] As examples of the organic group combined with silicon in the main component, mention can be made of: alkyl groups (methyl, ethyl, propyl, butyl, pentyl, hexyl, etc.), aryl groups (phenyl, tolyl, xylyl, etc.), haloalkyl groups (3-chloropropyl, 3,3,3-trifluoropropyl, etc.). Of the above examples, use of methyl is preferred. As examples of the molecular structure of the main component, mention can be made of linear, linear with partial branching, branched, network, and dendritic.

[0070] As the hydrogenated organopolysiloxane of the main component, for example, a dimethylhydrogenmethylsiloxane having both ends of the molecular chain capped with dimethylhydrogensiloxy groups, a polymethylhydrogensiloxane having both ends of the molecular chain capped with trimethylsiloxy groups, a dimethylsiloxane-methylhydrogensiloxane copolymer having both ends of the molecular chain capped with trimethylsiloxy groups, a cyclic polymethylhydrogensiloxane, a methylhydrogenpolysiloxane having both ends of the molecular chain capped with trimethylsiloxy groups and having a siloxane unit represented by the formula: 1 / 2 a siloxane unit represented by the formula: 4 / 2 an organopolysiloxane composed of a siloxane unit represented by the formula, an organopolysiloxane obtained by substituting at least a part of the methyl groups of these organopolysiloxanes with an alkyl group (ethyl, propyl, etc.), an aryl group (phenyl, tolyl, etc.), a haloalkyl group (3,3,3-trifluoropropyl, etc.), and a mixture of two or more of these organopolysiloxanes. Of these, from the viewpoint of improving the mechanical properties (particularly, the elongation) of the obtained cured product, a mixture of an organopolysiloxane having a silicon atom-bonded hydrogen atom only at both ends of the molecular chain and an organopolysiloxane having a silicon atom bond in the side chain of the molecular chain is preferably used.

[0071] The content of the main component in the addition-curable curable organopolysiloxane composition is in the range of 0.01 to 20, preferably in the range of 0.1 to 10, and further preferably in the range of 0.1 to 5, in terms of the molar ratio of silicon atom-bonded hydrogen atoms in the main component to alkenyl groups in the (2-1-1) component. The reason for setting the range is that if the content of the main component is above the lower limit of the range, there is a tendency for the silicone rubber to be easily sufficiently cured, whereas if it is below the upper limit of the range, there is a tendency for the mechanical properties of the cured adhesive sheet to be further improved. In the case of using a mixture of an organopolysiloxane having silicon atom-bonded hydrogen atoms only at both molecular chain terminals and an organopolysiloxane having silicon atom bonds at a side chain of a molecular chain as the main component, the content of the former organopolysiloxane is preferably in the range of 0.01 to 10, further preferably in the range of 0.1 to 10, and more further preferably in the range of 0.1 to 5, in terms of the molar ratio of silicon atom-bonded hydrogen atoms in the main component to alkenyl groups in the (2-1-1) component. In addition, the content of the latter organopolysiloxane is preferably in the range of 0.5 to 20, further preferably in the range of 0.5 to 10, and further preferably in the range of 0.5 to 5, in terms of the molar ratio of silicon atom-bonded hydrogen atoms in the main component to alkenyl groups in the (2-1-1) component.

[0072] (2-1-3) Curing catalyst

[0073] The curing catalyst is not essential, and as a preferred example, a platinum-based catalyst for hydrosilylation reaction can be cited. As examples of the platinum-based catalyst for hydrosilylation reaction, platinum ultrafine powder, platinum black, chloroplatinic acid, alcohol-modified chloroplatinic acid, a complex of platinum and diketone, a complex of chloroplatinic acid and olefin, a complex of chloroplatinic acid and alkenylsiloxane, and a catalyst obtained by supporting them on a carrier (alumina, silica, carbon black, etc.) can be cited. Among them, from the viewpoint of the size of catalytic activity, a complex of chloroplatinic acid and alkenylsiloxane is preferably used. In addition, a complex of chloroplatinic acid and divinyltetramethyldisiloxane is further preferably used. The amount of the main component to be compounded is preferably in the range of 1 to 1000 parts by mass, and more preferably in the range of 1 to 100 parts by mass, in terms of platinum metal atoms, per 100,000 parts by mass of the (2-1-1) component.

[0074] (2-1-4) Filler

[0075] The filler is a substance added to improve the mechanical strength of the addition-curable curable organopolysiloxane composition, and generally a known compound used in the formulation of silicone rubber can be used. As the main component, for example, fumed silica, precipitated silica, calcined silica, crushed quartz, and powders obtained by surface treatment of these silica powders with organosilicon compounds (organooxyalkylsilane, organohalosilane, organosilazane, etc.) can be mentioned. In particular, in order to sufficiently improve the mechanical strength of the cured body, as the main component, it is preferable to use a silica powder having a BET specific surface area of 50 m2 / g or more. 2

[0076] In the addition-curable curable organopolysiloxane composition, the addition of the main component is arbitrary, but in order to improve the mechanical strength of the cured silicone rubber, the compounding amount of the main component is preferably in the range of 1 to 1000 parts by mass, and further preferably in the range of 1 to 400 parts by mass, relative to 100 parts by mass of the (2-1-1) component. In addition, the addition-curable curable organopolysiloxane composition can contain, as other arbitrary components, for example, inorganic fillers such as fumed titanium oxide, diatomaceous earth, iron oxide, aluminum oxide, aluminosilicate, calcium carbonate, zinc oxide, and aluminum hydroxide, and organic fillers. The addition-curable curable organopolysiloxane composition can also contain fillers obtained by surface treatment of these fillers with the above-mentioned organosilicon compounds. The compounding amount of the filler can be selected depending on the purpose and the type of the filler, and is in the range of 1 to 90% by volume, and preferably in the range of 5 to 60% by volume, relative to the (2-1-1) component.

[0077] (2-1-5) Other

[0078] Further, in the addition-curable curable organopolysiloxane composition, in order to adjust the curability thereof, it is preferable to contain an acetylene-based compound (3-methyl-1-butyne-3-ol, 3,5-dimethyl-1-hexyne-3-ol, 3-phenyl-1-butyne-3-ol, etc.), an ene-yne compound (3-methyl-3-penten-1-yne, 3,5-dimethyl-3-hexen-1-yne, etc.), an organosiloxane compound having 5% by mass or more of a vinyl group in one molecule (1,3,5,7-tetramethyl-1,3,5,7-tetra vinylcyclotetrasiloxane, 1,3,5,7-tetramethyl-1,3,5,7-tetrahexenylcyclotetrasiloxane, methylvinylsiloxane capped at both ends of the molecular chain with a silanol group, methylvinylsiloxane-dimethylsiloxane copolymer capped at both ends of the molecular chain with a silanol group, etc.), other curing inhibitors (triazoles such as benzotriazole, phosphine compounds, mercaptans, hydrazines, etc.). The content thereof is not limited, and is preferably in the range of 0.001 to 5 parts by mass, relative to 100 parts by mass of the (2-1-1) component.

[0079] ​The method for producing the addition-curable curable organopolysiloxane composition is not limited, and other arbitrary components can be mixed as needed to produce it, preferably, the remaining components are added to a base compound prepared by previously mixing and heating the (2-1-1) component and the (2-1-3) component. Note that, in the case of adding other arbitrary components, they can be added when the base compound is produced, and in the case of denaturing other arbitrary components by mixing and heating, they can be added when the (2-1-2) component and the (2-1-4) component are added. In addition, the aforementioned organosilicon compound can be added to treat the surface of the (2-1-3) component in-situ when the base compound is produced.

[0080] (condensation reaction type)

[0081] The curable silicone rubber composition of the condensation reaction type, for example, can be composed mainly of the following components.

[0082] (2-1-6) organopolysiloxane

[0083] The organopolysiloxane is a main agent component of the curable silicone rubber composition of the condensation reaction type, and is preferably a diorganopolysiloxane represented by the following Chemical Formula (1) or Chemical Formula (2). The chemical formula can also be referred to as an average composition formula.

[0084] Chemical Formula 1

[0085]

[0086] Chemical Formula 2

[0087]

[0088] In the aforementioned Chemical Formula (1), (2), R is a monovalent hydrocarbon group. As R, one or more hydrocarbon groups selected from the group consisting of an alkyl group (methyl, ethyl, propyl, butyl, 2-ethylbutyl, octyl, etc.), a cycloalkyl group (cyclohexyl, cyclopentyl, etc.), an alkenyl group (vinyl, propenyl, butenyl, heptenyl, hexenyl, allyl, etc.), an aryl group (phenyl, tolyl, xylyl, naphthyl, diphenyl, etc.), an aralkyl group (benzyl, phenylethyl, etc.), and a group in which at least a part of the hydrogen atoms bonded to the carbon atoms of the aforementioned hydrocarbon groups is substituted with a halogen, a cyano group, etc. (chloromethyl, trifluoropropyl, 2-cyanoethyl, 3-cyano-propyl, etc.) can be mentioned. The number of carbon atoms of R is preferably 1 to 12, and further preferably 1 to 10. In the aforementioned Chemical Formula (1), (2), A is an oxygen atom or -(CH2) m (m is 1 to 8) represents a polymethylene group (containing methylene groups). A is preferably an oxygen atom or a methylene group.

[0089] In the above Chemical Formulas (1), (2), n is an arbitrary number within the range of 100 to 1,000,000 cm 2 / s in terms of dynamic viscosity of the (2-1-6) component at 25°C. The kinematic viscosity is further preferably set within the range of 500 to 500,000 cm 2 / s.

[0090] In the above Chemical Formulas (1), (2), B is a hydrolyzable group. As B, an alkoxy group (methoxy group, ethoxy group, propoxy group, butoxy group, etc.), a ketoxime group (dimethyl ketoxime group, methylethyl ketoxime group, etc.), an acyloxy group (acetoxy group, etc.), an alkenyloxy group (isopropenyloxy group, isobutenyloxy group, etc.) can be given. Note that x in the above Chemical Formulas (1), (2) is 2 or 3.

[0091] The above (2-1-6) component can be produced by a publicly known method (for example, a method based on an equilibrium reaction using a cyclic siloxane or a linear oligomer and an acid catalyst or a base catalyst).

[0092] Note that in the case where a branched structure is introduced in the diorganopolysiloxane as the (2-1-6) component, as a general method, a silane or siloxane containing at least one of a SiO 3 / 2 unit and a SiO 4 / 2 unit can be used in polymerization to the extent that the diorganopolysiloxane does not become non-gelable. In the case of the (2-1-6) component, in order to reduce dirt, it is preferable to use after removing a low-molecular siloxane by washing or the like.

[0093] (2-1-7) Cross-linking Agent

[0094] As the cross-linking agent, a silane having two or more, preferably three or more, hydrolyzable groups in one molecule, or a partial hydrolysis condensate of the silane is used. As examples of the hydrolyzable group, an alkoxy group (methoxy group, ethoxy group, butoxy group, etc.), a ketoxime group (dimethyl ketoxime group, methylethyl ketoxime group, etc.), an acyloxy group (acetoxy group, etc.), an alkenyloxy group (isopropenyloxy group, isobutenyloxy group, etc.), an amino group (N-butylamino group, N,N-diethylamino group, etc.), an amido group (N-methylacetamido group, etc.) can be given. Among these, an alkoxy group, a ketoxime group, an acyloxy group, an alkenyloxy group is preferably used. The blending amount of the cross-linking agent is preferably within the range of 1 to 50 parts by mass, further preferably within the range of 2 to 30 parts by mass, and more further preferably within the range of 5 to 20 parts by mass, with respect to 100 parts by mass of the (2-1-6) component.

[0095] (2-1-8) Curing Catalyst

[0096] The curing catalyst is not essential, but by using the curing catalyst, the curing of the curable silicone rubber composition can be promoted. As examples of the curing catalyst, there can be mentioned alkyl tin ester compounds (dibutyl tin diacetate, dibutyl tin dilaurate, dibutyl tin dioctate, etc.), titanate or titanium chelate compounds (tetraisopropoxy titanium, tetra-n-butoxy titanium, tetra(2-ethylhexyloxy) titanium, dipropoxy bis(acetylacetone) titanium, isopropoxy octyleneglycol titanium, etc.), other appropriate organometallic compounds (zinc naphthenate, zinc stearate, zinc-2- ethyl octanoate, iron-2-ethyl hexanoate, cobalt-2-ethyl hexanoate, manganese-2-ethyl hexanoate, cobalt naphthenate, alkoxy aluminum compounds, etc.), aminoalkyl-substituted alkoxysilane (3-aminopropyl triethoxysilane, N-β(aminoethyl) γ-aminopropyl trimethoxysilane, etc.), amine compounds or salts thereof (hexyl amine, dodecyl amine phosphate, etc.), quaternary ammonium salts (benzyl triethyl ammonium acetate, etc.), lower aliphatic acid salts of alkali metals (potassium acetate, sodium acetate, lithium oxalate, etc.), dialkyl hydroxylamine (dimethyl hydroxylamine, diethyl hydroxylamine, etc.), silane or siloxane having a guanidino group (tetramethyl guanidino propyl trimethoxysilane, tetramethyl guanidino propyl methyl dimethoxysilane, tetramethyl guanidino propyl tris(trimethylsiloxy) silane, etc.). They can be used only one kind, or a mixture of two or more kinds can be used. The blending amount of the curing catalyst is preferably in the range of 0 to 20 parts by mass, further preferably in the range of 0.001 to 10 parts by mass, and more further preferably in the range of 0.01 to 5 parts by mass, relative to 100 parts by mass of the (2-1-6) component.

[0097] (2-1-9) Filler

[0098] The filler is not essential, but can be appropriately used for the purpose of reinforcement, etc. As examples of the filler, there can be mentioned reinforcing agents (fumed silica, precipitated silica, silica obtained by hydrophobically treating the surface of these silicas with an organosilicon compound, quartz powder, talc, zeolite, bentonite, etc.), fibrous fillers (asbestos, glass fiber, organic fiber, etc.), basic fillers (calcium carbonate, zinc carbonate, zinc oxide, magnesium oxide, diatomite, etc.). Among them, silica, calcium carbonate and zeolite are preferably used, and further fumed silica and calcium carbonate obtained by hydrophobically treating the surface are preferably used. The blending amount of the above-mentioned filler can be selected according to the purpose, the kind of the filler, and is in the range of 1 to 90% by volume, preferably in the range of 5 to 60% by volume, relative to the (2-1-6) component.

[0099] (2-1-10) Adhesion-imparting component

[0100] The adhesion-imparting component is not essential, but can be appropriately used. As examples of the adhesion-imparting component, there can be mentioned an amino group-containing organic alkoxysilane (γ-aminopropyltrimethoxysilane, γ-(2-aminoethyl)aminopropyltrimethoxysilane, etc.), an epoxy group-containing organic alkoxysilane (γ- glycidoxypropyltrimethoxysilane, etc.), a mercapto group-containing organic alkoxysilane (γ-mercaptopropyltrimethoxysilane, etc.), and a reaction mixture of an amino group-containing organic alkoxysilane and an epoxy group-containing organic alkoxysilane. The blending amount of the adhesion-imparting component is preferably in the range of 0.1 to 5 parts by mass per 100 parts by mass of the component (2-1-6).

[0101] The plasticity of the silicone rubber compound as a raw material before curing of the silicone rubber is preferably 100 to 400. By setting the plasticity of the silicone rubber compound in this range, deformation due to the dead weight until curing can be suppressed. Note that, in the present embodiment, the "plasticity" is the Williams plasticity at 25°C. The Williams plasticity is a parameter obtained by measurement using a parallel-plate plastometer (Williams plastometer) according to the measurement method specified in JIS K6249 "Test methods for uncured and cured silicone rubbers". In addition, the adhesion strength to the galvanized steel sheet can be appropriately adjusted depending on the usage of the corrosion protection structure 6. For example, in the case where the corrosion protection member 1 is desired to be easily detached when the bolt 2 and the nut 3 are tightened, in addition to the corrosion protection of the bolt 2 and the nut 3, the adhesion strength is preferably adjusted to at least a degree at which the corrosion protection member 1 can be detached. In addition, in the case where the rotation and the detachment of the bolt 2 are desired to be prevented, in addition to the corrosion protection of the bolt 2 and the nut 3, the adhesion strength is preferably adjusted so that the adhesion of the bolt 2 to the silicone rubber becomes stronger. In addition, the main body portion 10 can be adjusted in the adhesion strength by incorporating a metal soap such as zinc stearate in the silicone rubber.

[0102] (3) Coating layer

[0103] The coating layer 20 is a layer composed of silicone rubber, and is a layer that covers the joint surface 50. The coating layer 20 is preferably formed with a hole 7 into which the joint portion using the bolt 2 and the nut 3 can be inserted. That is, the coating layer 20 is preferably a layer that covers a region of the joint surface 50 other than the joint portion. However, the hole 7 can not be formed. The silicone rubber that constitutes the coating layer 20 is the same as the aforementioned main body portion 10, and is a rubber-like elastic body obtained by curing a curable organopolysiloxane composition (silicone rubber compound) containing an organopolysiloxane as a main agent. The plasticity of the silicone rubber compound, which is a raw material before curing of the silicone rubber, is preferably 100 to 600. The thickness of the coating layer 20 is preferably 0.5 to 3.5 mm, and more preferably 1.0 to 2.0 mm. Note that the silicone rubber compound, which is a raw material before curing of the silicone rubber that constitutes the coating layer 20, is the same as the curable organopolysiloxane composition, which is a raw material before curing of the silicone rubber that constitutes the main body portion 10, except for the plasticity, and thus detailed description is omitted.

[0104] The corrosion protection structure 6 thus configured is provided with the corrosion protection member 1 composed of silicone rubber that is excellent in heat resistance, water resistance, weather resistance, electrical insulation, and the like, and thus can improve durability against corrosion protection effects as compared with a case where the corrosion protection member is composed of vinyl chloride or an epoxy resin. In addition, since the joint surface 50 is covered by the coating layer 20, the corrosion protection structure 6 can, for example, suppress rusting on the joint surface 50 due to rainwater intruding from a gap between the joint surface 50 of the structure 5 and the joint portion. In addition, since the main body portion 10 of the corrosion protection member 1 composed of silicone rubber is mounted on the coating layer 20 composed of silicone rubber, firm adhesion of silicone to silicone can be obtained, and durability can be further improved.

[0105] (Second Embodiment)

[0106] Next, the corrosion protection structure according to the second embodiment will be described. Portions common to the previous embodiment are denoted by the same reference numerals and repeated description is omitted.

[0107] Figure 2 A longitudinal sectional view of the corrosion protection structure according to the second embodiment is shown.

[0108] The corrosion protection structure 6a according to the second embodiment has a similar structure to the corrosion protection structure 6 according to the first embodiment, but differs from the corrosion protection structure 6 according to the first embodiment in that the corrosion protection member 1a is provided instead of the corrosion protection member 1. In addition, the corrosion protection structure 6a is the same as the corrosion protection structure 6 according to the first embodiment except for the corrosion protection member 1a, and thus detailed description is omitted.

[0109] The anticorrosion member 1a differs from the anticorrosion member 1 according to the first embodiment in that the anticorrosion member 1a is provided with a coating layer 20a instead of the coating layer 20. The coating layer 20a preferably has the adhesive layer 22 at least on the side of the joint surface 50. That is, the coating layer 20 is preferably composed of the base material layer 21 composed of silicone rubber and the adhesive layer 22 composed of silicone gel. For example, the coating layer 20 is formed of a silicone adhesive sheet composed of the base material layer 21 and the adhesive layer 22. The base material layer 21 and the adhesive layer 22 are the same as those of the coating layer 20 according to the first embodiment, and preferably, the hole 7a into which the joint portion using the bolt 2 and the nut 3 can be inserted is formed. However, the hole 7a can not be formed. The silicone rubber constituting the base material layer 21 is the same structure as that constituting the silicone rubber of the coating layer 20 according to the first embodiment, and thus detailed description is omitted. The thickness of the base material layer 21 is preferably 0.1 to 1.5 mm, and more preferably 0.5 to 0.8 mm. The thickness of the adhesive layer 22 is preferably 0.5 to 2.0 mm, and more preferably 0.8 to 1.2 mm. In addition, the anticorrosion member 1a is the same as the anticorrosion member 1 according to the first embodiment except for the coating layer 20a, and thus detailed description is omitted.

[0110] The anticorrosion structure 6a thus configured also exhibits the same effects as the anticorrosion structure 6 according to the first embodiment. Since the coating layer 20a has the adhesive layer 22 on the side of the joint surface 50, the adhesion of the coating layer 20a to the joint surface 50 can be made firm, and the durability can be further improved. In addition, the main body portion 10 of the anticorrosion member 1a composed of silicone rubber is mounted on the base material layer 21 composed of silicone rubber, and thus firm adhesion of silicon to silicon can be obtained, and the durability can be further improved.

[0111] 2. Method for manufacturing anticorrosion structure

[0112] Next, each embodiment of the preferred method for manufacturing the anticorrosion structure according to the embodiments of the present application will be described.

[0113] (First embodiment)

[0114] Figure 3 A flowchart showing the main steps of the method for manufacturing the anticorrosion structure according to the first and second embodiments. Figures 4-7 A diagram for explaining the manufacturing steps of the anticorrosion structure according to the first embodiment. It should be noted that Figures 4-7 The same view angle as Figure 1 is used to show the manufacturing steps of the anticorrosion structure.

[0115] The manufacturing method of the corrosion protection structure according to the present embodiment is an example of the method of manufacturing the corrosion protection structure 6 according to the first embodiment described above. The manufacturing method of the corrosion protection structure according to the present embodiment includes a bolt-nut joining step (SI 10), a coating layer forming step (SI 20), a supplying step (SI 30), a mold closing step (SI 40), a mold opening step (SI 50), a curing step (SI 60), and a remaining member removing step (SI 70). Each of the steps will be described below.

[0116] 2.1 Bolt-nut joining step (SI 10)

[0117] The bolt-nut joining step is a step of joining using the bolt 2 and the nut 3 in the joint surface 50 of the structure 5 (see FIG. 2, a) of the first embodiment. The bolt-nut joining step is preferably a step of inserting the bolt 2 and joining using the bolt 2 and the nut 3 in a state where the washer 4 is disposed between the joint surface 50 and the nut 3. Figure 4

[0118] 2.2 Coating layer forming step (SI 20)

[0119] The coating layer forming step is a step of forming the coating layer 20 by covering the joint surface 50 with silicone rubber (see FIG. 2, b) of the first embodiment. The coating layer forming step is preferably a step of covering the joint surface 50 with a silicone rubber sheet composed of silicone rubber cured from a silicone rubber compound having a plasticity of 100 to 600. The silicone rubber sheet preferably has a hole 7 into which the joined portion of the bolt 2 and the nut 3 can be inserted. Figure 4

[0120] 2.3 Supplying step (SI 30)

[0121] The supplying step is a step of supplying a silicone rubber compound 90 for covering a portion protruding from the joint surface 50 at the joined portion of the bolt 2 and the nut 3 (see FIG. 2, c) of the first embodiment. Figure 4 ​​c) of the present application. More specifically, the supplying step preferably supplies the silicon rubber compound 90 having a plasticity of 100 to 400 to the tip end of the leg portion of the bolt 2. In this embodiment, the silicon rubber compound 90 is preferably a composition of a moisture-curing type in a semi-solid state (also referred to as a semi-cured state). The supplying step preferably supplies a block of the silicon rubber compound in a semi-solid state to the tip end of the leg portion of the bolt 2. In this state where the silicon rubber compound 90 in a semi-solid state is supplied, the molding die 80 is closed in the die closing step (S140) described later, thereby covering the portion protruding from the joint surface 50. Note that, in the supplying step, the position where the silicon rubber compound 90 in a semi-solid state is supplied is not limited to the tip end of the leg portion of the bolt 2, and can be a portion other than the tip end of the leg portion of the bolt 2 in the portion protruding from the joint surface 50, or the entire outer periphery of the portion protruding from the joint surface 50. The supplying step (S130) and the die closing step (S140) are examples of the covering step of the present application.

[0122] 2.4 Die closing step (S140)

[0123] The die closing step is a step of providing the molding die 80 so as to cover the portion protruding from the joint surface 50 in the joint portion of the bolt-nut combination, and closing the molding die 80. (Refer to FIG. 2) Figure 5 More specifically, the die closing step closes the molding die 80 so as to cover the silicon rubber compound 90 supplied in the supplying step (S130), and closes the molding die 80. The molding die 80 is a die that covers the portion protruding from the joint surface 50 in the joint portion. The molding die 80 preferably has an opening portion 84 that is open on the tip end side of the leg portion of the bolt (refer to FIG. 2) Figure 5 More specifically, the die closing step closes the molding die 80 so as to cover the silicon rubber compound 90 supplied in the supplying step (S130), and closes the molding die 80. The molding die 80 is a die that covers the portion protruding from the joint surface 50 in the joint portion. The molding die 80 preferably has an opening portion 84 that is open on the tip end side of the leg portion of the bolt (refer to FIG. 2) Figure 6

[0124] The inner side die 60 is a die that can be closed in the left-right direction, and has a left side die 60a and a right side die 60b. However, the direction in which the die is closed is not limited to the paper left-right direction, and can be the up-down direction or the like instead of or together with the left-right direction. Figure 6 The left side die 60a has a left side die main body portion 61a, a left side die recess portion 62a, and a left side die opening portion 64a. The right side die 60b has a right side die main body portion 61b, a right side die recess portion 62b, and a right side die opening portion 64b. The inner side die 60 has an inner side die main body portion 61, an inner side die recess portion 62, and an inner side die opening portion 64 by the joint of the left side die 60a and the right side die 60b (refer to FIG. 2) Figure 5 ​d) of FIG. 1. The inner mold recess 62 is a recess in which the portion protruding from the joint surface 50 of the joint portion is disposed. The inner mold opening portion 64 is a region of the leg portion front end side opening of the bolt 2 formed by joining the left mold opening portion 64a and the right mold opening portion 64b, and has a through-hole 65 that penetrates the inner mold recess 62.

[0125] The outer mold 70 is a mold that covers the inner mold 60, and has an outer mold main body portion 71, an outer mold recess 72, and an outer mold opening portion 74 (refer to Figure 6 f) of FIG. 1. The outer mold recess 72 is a recess in which the inner mold 60 is disposed. The outer mold opening portion 74 is an opening portion that penetrates the outer mold recess 72, and is joined to the through-hole 65 of the inner mold 60 to form the opening portion 84 (refer to Figure 5 d) of FIG. 1.

[0126] In the mold closing process, the molding mold 80 in which the outer mold 70 is disposed so as to cover the inner mold 60 is covered so as to press the silicone rubber compound 90, whereby the molding mold 80 is closed (refer to Figure 5 d and e) of FIG. 1. By the mold closing, a gap surrounded by the inner mold 60, the bolt 2, the nut 3, and the washer 4 is formed. The gap is a gap for forming the corrosion protection member 1, and communicates with the opening portion 84. In this embodiment, the semi-solid silicone rubber compound 90 supplied to the leg portion front end of the bolt 2 in the supplying process (S130) is filled into the gap by the mold closing. In addition, the silicone rubber compound 90 of the remaining portion of the silicone rubber compound 90 supplied in the supplying process (S130) that is not filled into the gap is discharged to the opening portion 84. That is, the opening portion 84 is a site for discharging the silicone rubber compound 90 of the remaining portion that is not filled into the gap. The shape of the opening portion 84 is a substantially cylindrical shape, but can be other shapes as long as the silicone rubber compound 90 of the remaining portion can be discharged. In addition, the molding mold 80 is not particularly limited as long as a gap for forming the corrosion protection member 1 can be formed. In addition, in the mold closing process, the outer mold 70 can be disposed so as to cover the inner mold 60 after the inner mold 60 is covered so as to press the silicone rubber compound 90, whereby the molding mold 80 can be closed.

[0127] 2.5 Mold opening process (S150)

[0128] The mold opening process is a process of opening the molding mold 80 (refer to Figure 6f). More specifically, the mold opening process first detaches the outer mold 70, and then opens the inner mold 60 in the left-right direction. At this time, the silicone rubber compound 90 that covers the outer periphery of the bolt 2 and the nut 3 is in a semi-solid state. In this embodiment, the plasticity of the silicone rubber compound 90 is 100 to 400, and thus even if the molding mold 80 is opened in the semi-solid state before curing, the deformation of the silicone rubber compound 90 due to the weight can be suppressed.

[0129] 2.6 Curing process (S160)

[0130] The curing process is a process of curing the silicone rubber compound (refer to Figure 7 g) of the present application. The curing process preferably cures the silicone rubber compound 90 of the portion that protrudes from the joint surface 50 in the supplying process (S130) and the mold closing process (S140). The curing conditions differ depending on the type of the silicone rubber compound. For example, in the case of using an addition-curing type curable organopolysiloxane composition, the curing process is preferably performed at 80 to 150°C, and more preferably at 90 to 120°C. In the curing process, further as a secondary vulcanization, it can be performed at a higher temperature, preferably at 180 to 250°C, and more preferably at 190 to 220°C. In the case of using a two-liquid addition-reaction type curable organopolysiloxane composition, the curing process can also be performed at room temperature (20 to 30°C). In the case of using a condensation-reaction type curable organopolysiloxane composition, the curing process is usually performed at room temperature (20 to 30°C). In the case of using a UV-curing type or an electron beam-curing type curable organopolysiloxane composition, by irradiating ultraviolet rays or electron beams to the inside of the molding mold 80 into which the above mixture is put, a silicone rubber can be obtained. As a result, the main body portion 10, the coating layer 20, and the remaining portion 11 of the corrosion-resistant member 1 are formed. The remaining portion 11 is a portion formed of the silicone rubber compound 90 that is not filled in the gap surrounded by the inner mold 60, the bolt 2, the nut 3, and the gasket 4, and is a portion that protrudes from the main body portion 10 toward the opening portion 84.

[0131] 2.7 Remaining portion removing process (S170)

[0132] The remaining portion removing process is a process of removing the remaining portion 11 (refer to Figure 7 g and h) of the present application. The method of removing the remaining portion 11 can be, for example, mechanically cutting the remaining portion 11, or removing by polishing the surface of the remaining portion 11.

[0133] The corrosion protection structure 6 manufactured in this way is composed of silicone rubber that is excellent in heat resistance, water resistance, weather resistance, electrical insulation, and the like, and in addition, the joint surface 50 is covered by the coating layer 20, so the durability against the corrosion protection effect can be improved. In addition, since the silicone rubber compound having a plasticity of 100 to 400 is used, the deformation of the silicone rubber compound due to the self weight can be suppressed. Therefore, the molding die 80 can be opened in the semi-solid state before the silicone rubber compound is cured, and the manufacturing of the new corrosion protection structure 6 can be started using the molding die 80, so a large number of molding dies 80 are not required, and the operation time can be shortened.

[0134] (Second Embodiment)

[0135] Next, a second embodiment of the preferred manufacturing method of the corrosion protection structure according to the present application will be described. The same reference numerals are given to the portions common to the previous embodiment, and the repeated description will be omitted.

[0136] Figures 8-11 FIG. 6 is a view for explaining the manufacturing process of the corrosion protection structure according to the second embodiment. It should be noted that Figures 8-11 the same view angle as FIG. 5. Figure 2

[0137] The manufacturing method according to this embodiment is an example of the method of manufacturing the corrosion protection structure 6a according to the second embodiment described above. The manufacturing method of the corrosion protection structure according to this embodiment is different from the manufacturing method according to the first embodiment in that the coating layer 20a is formed instead of the coating layer 20. The structure and each process of the manufacturing method are the same as those of the manufacturing method according to the first embodiment except for this. That is, the manufacturing method of the corrosion protection structure according to this embodiment is the same as that according to the first embodiment, and includes the bolt-nut joining process (S110), the coating layer forming process (S120), the supplying process (S130), the die closing process (S140), the die opening process (S150), the curing process (S160), and the remaining component removing process (S170) (see FIG. 4). Figure 3

[0138] First, the bolt-nut joining process (S110) is performed as in the first embodiment. Next, in the coating layer forming process (S120), the joint surface 50 is covered with the silicone rubber sheet having the adhesive layer 22 to form the coating layer 20a (see FIG. 6). Figure 8 ​​i) of the first embodiment. In the coating layer forming step (S120), the silicone adhesive sheet composed of the base material layer 21 and the adhesive layer 22 is attached to the joint surface 50 in a manner that the adhesive layer 22 is arranged on the joint surface 50 side, thereby forming the coating layer 20a. The silicone adhesive sheet is the same as the silicone rubber sheet material for forming the coating layer 20 of the first embodiment, and preferably forms the hole 7a into which the joint portion of the bolt 2 and the nut 3 can be inserted.

[0139] Then, the same as the first embodiment described above, by implementing the feeding step (S130), the mold closing step (S140), the mold opening step (S150), the curing step (S160), and the remaining member removing step (S170), the corrosion protection structure 6a is manufactured (refer to FIG. 8). Figure 8 Figure 9 Figure 10 Figure 11

[0140] The corrosion protection structure 6a manufactured as such is also the same as the corrosion protection structure 6, and can improve the durability against the corrosion protection effect. In addition, since the silicone rubber compound having a plasticity of 100 to 400 is used, the molding die 80 can be opened in the semi-solid state before the silicone rubber compound is cured, a large number of molding dies 80 are not required, and the operation time can be shortened. In addition, the corrosion protection structure 6a can more easily form the coating layer 20a by attaching the silicone adhesive sheet to the joint surface 50, and the durability can be further improved.

[0141] (Third Embodiment)

[0142] Next, a third embodiment of the preferred manufacturing method of the corrosion protection structure involved in the embodiments of the present application will be described. The same reference numerals are assigned to the portions common to the previous embodiments, and the repeated description will be omitted.

[0143] Figure 12 A flowchart showing the main steps of the manufacturing method of the corrosion protection structure involved in the third and fourth embodiments. Figures 13-16 A diagram for explaining the manufacturing steps of the corrosion protection structure involved in the third embodiment. It should be noted that Figures 13-16 The manufacturing steps of the corrosion protection structure are shown by the same perspective view as Figure 1

[0144] ​​​​​The manufacturing method of the corrosion protection structure according to the present embodiment is an example of the manufacturing method of the corrosion protection structure 6 according to the first embodiment described above. The manufacturing method of the corrosion protection structure according to the present embodiment includes a bolt-nut joining step (S110), a coating layer forming step (S120), a mold closing step (S140), a supplying step (S230), a curing step (S260), a mold opening step (S150), and a remaining member removing step (S170). The manufacturing method of the corrosion protection structure according to the present embodiment is different from the manufacturing method of the first embodiment described above in that the supplying step (S230) is performed instead of the supplying step (S130) after the mold closing step (S140), and the curing step (S260) is performed instead of the curing step (S160) before the mold opening step (S150), and is the same as the manufacturing method of the first embodiment in other respects.

[0145] First, the bolt-nut joining step (S110) and the coating layer forming step (S120) are performed in the same manner as in the first embodiment described above (refer to a and b of FIG. 6). Figure 13 Next, in the mold closing step (S140), the aforementioned molding mold 80 is disposed so as to cover the portion protruding from the joint surface 50 in the bolt-nut joined portion, and the molding mold 80 is closed (refer to p of FIG. 7). Figure 14 In the present embodiment, the mold closing step is performed so as to cover the inner mold 60 with the portion protruding from the joint surface 50 first, and then cover the outer mold 70 with the inner mold 60. Alternatively, the molding mold 80 in which the outer mold 70 is disposed so as to cover the inner mold 60 can be disposed so as to cover the portion protruding from the joint surface 50 and closed in the same manner as in the first embodiment described above. The molding mold 80 preferably has an opening portion 84 that opens on the tip side of the leg portion of the bolt (refer to q of FIG. 7). Figure 15 In the present embodiment, the opening portion 84 is a supply port (gate) for supplying the silicon rubber compound 90 that becomes the main body portion 10 of the corrosion protection member 1 after curing to the inside of the molding mold 80 (the inner mold 60). In the present embodiment, the shape of the opening portion 84 is a substantially cylindrical shape, but can be another shape as long as the silicon rubber compound 90 can be supplied to the inside of the molding mold 80 (the inner mold 60) by the piston 86 described below. By closing the molding mold 80, a gap surrounded by the inner mold 60, the bolt 2, the nut 3, and the washer 4 is formed. This gap communicates with the opening portion 84 and is used to form the corrosion protection member 1.

[0146] Next, a supply process (S230) is implemented. The supply process (S230) is a process of covering the portion protruding from the joint surface 50 of the joint portion using the silicone rubber compound 90 (refer to Figure 15 In this embodiment, the silicone rubber compound 90 is preferably a liquid silicone rubber. The supply process preferably uses a press-in jig provided with the aforementioned molding die 80 and a piston 86 that presses the silicone rubber compound 90 from the opening portion 84 of the molding die 80, and covers the portion protruding from the joint surface 50 with the silicone rubber compound 90. More specifically, the supply process (S230) sets the silicone rubber compound 90 at the leg tip of the bolt 2 (in this embodiment, the opening portion 84), and presses the silicone rubber compound 90 from the opening portion 84 to the joint surface 50 with the end portion of the piston 86 in contact with the silicone rubber compound 90. The gap surrounded by the inner die 60, the bolt 2, the nut 3, and the washer 4 is connected to the opening portion 84, and thus the silicone rubber compound 90 can be supplied to the gap through the opening portion 84. As a result, the silicone rubber compound 90 fills the gap, and the portion protruding from the joint surface 50 of the joint portion is covered with the silicone rubber compound 90. Note that the piston 86 is not particularly limited as long as it is at least capable of pressing the silicone rubber compound into the shape of the gap formed in the molding die 80. The clamping process (S140) and the supply process (S230) are examples of the coating process of the present application.

[0147] Next, a supply process (S230) is implemented. The supply process (S230) is a process of covering the portion protruding from the joint surface 50 of the joint portion using the silicone rubber compound 90 (refer to Figure 16 In this embodiment, the silicone rubber compound 90 is preferably a liquid silicone rubber. The supply process preferably uses a press-in jig provided with the aforementioned molding die 80 and a piston 86 that presses the silicone rubber compound 90 from the opening portion 84 of the molding die 80, and covers the portion protruding from the joint surface 50 with the silicone rubber compound 90. More specifically, the supply process (S230) sets the silicone rubber compound 90 at the leg tip of the bolt 2 (in this embodiment, the opening portion 84), and presses the silicone rubber compound 90 from the opening portion 84 to the joint surface 50 with the end portion of the piston 86 in contact with the silicone rubber compound 90. The gap surrounded by the inner die 60, the bolt 2, the nut 3, and the washer 4 is connected to the opening portion 84, and thus the silicone rubber compound 90 can be supplied to the gap through the opening portion 84. As a result, the silicone rubber compound 90 fills the gap, and the portion protruding from the joint surface 50 of the joint portion is covered with the silicone rubber compound 90. Note that the piston 86 is not particularly limited as long as it is at least capable of pressing the silicone rubber compound into the shape of the gap formed in the molding die 80. The clamping process (S140) and the supply process (S230) are examples of the coating process of the present application. Figure 16

[0148] The corrosion-resistant structure 6 thus manufactured is the same as the corrosion-resistant structures 6, 6a manufactured by the manufacturing methods related to the above-described embodiments, and can improve the durability against the corrosion-resistant effect.

[0149] (Fourth Embodiment)

[0150] Next, a fourth embodiment of the preferred manufacturing method of the corrosion-resistant structure related to the embodiments of the present application will be described. The same reference numerals are assigned to the portions common to the previous embodiments, and the repeated description will be omitted.

[0151] Figures 17-20 ​Fig. 10 is a view for explaining a manufacturing process of the corrosion protection structure according to the fourth embodiment. Note that Figures 17-20 Fig. 11 is a view from the same perspective as Fig. 10, which shows a manufacturing process of the corrosion protection structure. Figure 2 Fig. 12 is a view from the same perspective as Fig. 11, which shows a manufacturing process of the corrosion protection structure.

[0152] The manufacturing method according to the embodiment is an example of a method of manufacturing the corrosion protection structure 6a according to the second embodiment described above. The manufacturing method of the corrosion protection structure according to the embodiment differs from the manufacturing method according to the third embodiment in that the coating layer 20a is formed instead of the coating layer 20, and is otherwise the same as the manufacturing method according to the third embodiment. That is, the manufacturing method of the corrosion protection structure according to the embodiment is the same as the manufacturing method according to the third embodiment, and includes the bolt-nut joining process (S110), the coating layer forming process (S120), the mold closing process (S140), the supplying process (S230), the curing process (S260), the mold opening process (S150), and the remaining member removing process (S170) (see Figure 12 ).

[0153] First, the bolt-nut joining process (S110) is performed (see a of Figure 17 ), and the coating layer 20a is formed in the coating layer forming process (S120) (see i of Figure 17 ). Then, the mold closing process (S140) and the supplying process (S230), and the curing process (S260) are performed as in the third embodiment described above (see w of Figure 18 , Figure 19 and Figure 20 ). Then, the corrosion protection structure 6a is manufactured by performing the mold opening process (S150) and the remaining member removing process (S170) as in the third embodiment described above (see n and o of Figure 20 ).

[0154] The corrosion protection structure 6a manufactured as above can also improve the durability of the corrosion protection effect as in the corrosion protection structures 6, 6a manufactured by the manufacturing methods according to the respective embodiments described above. In addition, the corrosion protection structure 6a can more easily form the coating layer 20a by attaching the silicone adhesive sheet to the joint surface 50, and can further improve the durability.

[0155] 3. Other Embodiments

[0156] As described above, the respective embodiments preferred according to the present application are described, but the present application is not limited to these embodiments, and various modifications can be made and implemented.

[0157] In each of the above-described embodiments, the anticorrosion member 1, 1a has the coating layer 20, 20a in the anticorrosion structure 6, 6a, but can not have the coating layer 20, 20a. That is, the anticorrosion member 1, 1a can be configured only by the main body 10.

[0158] In addition, the anticorrosion member 1, 1a covers the leg of the bolt 2 and the nut 3 protruding from the joint surface 50 of the structure 5, but can cover the head of the bolt 2 in addition to the leg of the bolt 2 and the nut 3.

[0159] In addition, the anticorrosion member 1, 1a covers the joint of the bolt 2 and the nut 3, but can cover the joint of at least one of the bolt 2 and the nut 3. The anticorrosion structure 6, 6a can have the anticorrosion member 1, 1a on the bolt 2 and the nut 3, on only the bolt 2, or on only the nut 3.

[0160] In addition, in each of the above-described manufacturing methods of the anticorrosion structure, the coating layer forming process (S120) is performed after the bolt-nut joint process (S110) is performed, but the bolt-nut joint process (S110) can be performed after the coating layer forming process (S120) is performed. In this case, a hole into which the bolt 2 is inserted can be formed in the joint surface 50, and the coating layer 20, 20a can be formed in a region of the joint surface 50 other than the hole. In addition, in this case, the coating layer 20, 20a can be formed between the gasket 4 and the joint surface 50.

[0161] Industrial Applicability

[0162] The present application can be used, for example, for bolts and nuts used in various structures such as bridges, towers, buildings, factories, houses, construction machines, and processing machines.

Claims

1. An anticorrosion structure characterized by comprising: An anticorrosion structure having a metal bolt and a metal nut, and an anticorrosion member that covers a portion protruding from a joint surface of a joint portion using the bolt and the nut, The anticorrosion member has a main body portion and a coating layer, The main body portion is made of silicone rubber obtained by curing a silicone rubber compound having a plasticity of 100 to 400 and containing an organopolysiloxane as a main agent, The coating layer is a layer that covers the joint surface and has a hole into which the joint portion can be inserted, and has an adhesive layer at least on the joint surface side.

2. The corrosion protection structure of claim 1, wherein, The adhesive layer is made of silicone gel.

3. The corrosion protection structure of claim 1, wherein, The coating layer is made of the silicone rubber obtained by curing a silicone rubber compound having a plasticity of 100 to 600.

4. A method for producing the anticorrosion structure according to any one of claims 1 to 3, comprising the following steps: a coating layer forming step in which the joint surface of the structure is covered with a silicone rubber sheet having an adhesive layer so that the adhesive layer is arranged at least on the joint surface side, thereby forming the coating layer; a coating step in which a portion protruding from a joint surface of a joint portion using a metal bolt and a metal nut is covered with a silicone rubber compound; and a curing step in which the silicone rubber compound is cured.

5. The method for producing an anticorrosion structure according to claim 4, wherein In the coating step, a molding die that covers the portion protruding from the joint surface of the joint portion is closed in a state in which the silicone rubber compound is supplied to the portion protruding from the joint surface of the joint portion, thereby covering the portion protruding from the joint surface of the joint portion with the silicone rubber compound.

6. The method for producing an anticorrosion structure according to claim 5, wherein In the coating step, the molding die is made of an inner die that is a die that covers the portion protruding from the joint surface of the joint portion and is separable into two or more, and an outer die that covers the inner die.

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