JP7288366B2 - Method for forming projecting object damage prevention structure - Google Patents

Description

The present invention relates to a method for forming a projection damage prevention structure .

Paved driveways or sidewalks are lined with many utility poles and streetlights. Many utility poles are made of metal or concrete and have relatively long-term durability. However, due to the effects of wind and rain, earthquakes, or sea breezes over many years, cracks and corroded parts may occur in the boundary between the utility pole and the paved surface or in the utility pole body near the boundary. Also, street lamps, which are usually made of metal, may corrode after years of use, like metal utility poles.

FIG. 5 schematically shows how a conventional metal streetlight is corroded near the boundary with a paved road.

As shown in this figure, a metal streetlight 20 is erected on a paved road 10, which is an example of a graded surface. The lower portion 21 of the pole that constitutes the streetlight 20 has a corroded portion 30 near the boundary between the paved road 10 and the lower portion 21 (also referred to as the ground portion) 22, as shown in region P. If the corroded portion 30 progresses deeper inward, the lamp 20 will require repair or replacement. However, if the depth of the corroded portion 30 is shallow, there is also the option of continuing to use the street lamp 20 by preventing further corrosion. On the other hand, if the corrosion is left unattended, the corroded portion 30 advances toward the interior of the lower portion 21 . As a result, the street lamp 20 may fall down.

Such a danger is common not only to the street lamp 20 but also to man-made protrusions such as utility poles, fences, and traffic lights that protrude from the leveled surface. For example, when repairing a utility pole, a method is known in which a hole is made in the upper part of the ground and resin concrete is injected into the hollow part of the utility pole using a concrete injection machine and solidified (for example, patent See Reference 1).

JP-A-2002-209316

However, the known repair methods described above are labor-intensive and cost a lot of money in the early stages of damage, as typified by corrosion. Another possible repair method is to excavate the graded surface around a protruding object, such as a utility pole, and repair or reinforce the area under the leveled surface of the overhang. However, such construction also requires much labor and cost. On the other hand, it is also necessary to prevent future damage to undamaged or nearly undamaged protrusions.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to easily and inexpensively prevent damage to a portion near a graded surface.

(1) A projecting object damage prevention structure according to an embodiment of the present invention for achieving the above object prevents damage to a ground portion near the leveled surface of an artificial projecting object erected on the leveled surface. A protrusion damage prevention structure for
a self-bonding silicone rubber that covers the outer periphery of the region above the protrusion from the ground portion;
a silicone rubber sealant that adheres to the damaged portion or the easily damaged portion across the self-adhesive silicone rubber and the leveling surface;
Prepare.
(2) In the projecting object damage prevention structure according to another embodiment, preferably, the projecting object is a metal pole.
(3) A method for forming a projection damage prevention structure according to an embodiment of the present invention for achieving the above object is a method for forming any of the projection damage prevention structures described above, comprising:
A covering step of covering the outer periphery of the region above the protrusion from the ground portion with a self-bonding silicone rubber;
a bonding step of bonding an adhesive silicone rubber composition in a semi-cured state to a damaged or easily damaged portion straddling the self-bonding silicone rubber and the leveling surface;
a curing step of curing the semi-cured adhesive silicone rubber composition to seal the damaged portion or the easily damaged portion;
including.
(4) In the method for forming a projecting object damage prevention structure according to another embodiment, preferably, prior to the bonding step, the surface of the leveling surface located around the damaged portion or the easily damaged portion is subjected to keren treatment. and/or applying a primer to the surface.

Advantageous Effects of Invention According to the present invention, it is possible to easily and inexpensively prevent damage to a portion near a leveled surface.

FIG. 1 schematically shows a situation in which a projecting portion having a projecting object damage prevention structure according to an embodiment of the present invention is erected on a leveled surface. FIG. 2 is a perspective view showing before and after execution from a state in which a portion of the ground portion of the protruding portion is damaged to a state in which damage prevention measures are taken. FIG. 3 shows a flow chart of each step of a method for forming a structure for preventing damage to a projecting object according to an embodiment of the present invention and a diagram for explaining changes in the structure in each step. FIG. 4 shows a flow chart of each step of a method for forming a projecting object damage prevention structure according to a modification of the present invention. FIG. 5 schematically shows how a conventional metal streetlight is corroded near the boundary with a paved road.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be noted that the embodiments described below do not limit the invention according to the scope of claims. Also, not all of the elements and their combinations described in the embodiments are essential to the solution of the present invention. In the embodiments, constituent elements having the same basic configuration and characteristics are denoted by the same reference numerals across the embodiments, and descriptions thereof may be omitted. The figures showing the components of the invention are schematic diagrams and are not necessarily accurate representations of actual dimensions or proportions.

1. Projection Damage Prevention Structure FIG. 1 schematically shows a situation in which a projection having a projection damage prevention structure according to an embodiment of the present invention is erected on a leveled surface. In FIG. 1, a region P is shown enlarged. FIG. 2 is a perspective view showing before and after execution from a state in which a portion of the ground portion of the protruding portion is damaged to a state in which damage prevention measures are taken. In FIG. 2, only a portion of the columnar body is drawn, and the upper part of the columnar part away from the ground plane is omitted.

The projecting object damage prevention structure 1 according to the embodiment of the present invention is a street lamp 20 (an example of an artificial projecting object) erected on a paved road 10 (an example of a leveled surface). It is a structure to prevent damage to the The projecting object damage prevention structure 1 includes a self-bonding silicone rubber 2 that covers the outer periphery of the region above the street lamp 20 from the ground portion 22, and a corroded portion 30 that straddles the self-bonding silicone rubber 2 and the paved road 10. and a silicone rubber sealant 3 adhering to (an example of a damaged portion). In this embodiment, the protrusion damage prevention structure 1 is formed on the lower portion 21 of the street lamp 20 near the pavement 10 . The projection damage prevention structure 1 comprises the self-adhesive silicone rubber 2 and the silicone rubber sealant 3 as minimum constituent elements. may be interpreted to include Also, the projecting object damage prevention structure may be called a projecting object damage prevention structure or a projecting object damage prevention structure.

In the present application, the graded surface is a paved road 10 paved with asphalt or the like (for example, a roadway, a sidewalk, a bicycle lane), a place leveled with concrete, a metal fixing plate placed directly under a streetlight 20, etc. and does not include unpaved dirt roads or unpaved grounds.

In addition, in the present application, an artificial protruding object means a product artificially protruding from a leveled surface such as a utility pole, a street light 20, a traffic light, a road sign, a fence, a steel pipe pole, a fire hydrant, a post box, etc. Does not include vegetation (e.g. street trees, flowers). The projections usually also have a portion embedded below the leveled surface, but may be mounted only above the leveled surface. In the projecting object damage prevention structure 1 , the projecting object is preferably a “metal pole” typified by the street lamp 20 . Metal poles include streetlights 20 as well as traffic lights and road signs. Examples of metals include iron and iron-based alloys including SUS, but are not limited to these.

Furthermore, in the present application, the ground portion means a portion of the projecting object near the leveled surface. In addition, damage means a state of being deteriorated from a normal state. A damaged portion means a portion that has deteriorated from a normal state, such as cracks, defects, corrosion (including rust), erosion, and dissolution. A easily damaged portion means a portion that has not yet deteriorated from a normal state, such as cracks, defects, corrosion (including rust), erosion, and dissolution, but is likely to deteriorate in the future. An example of a vulnerable portion can be a ground portion.

The lower portion 21 of the pole that constitutes the street lamp 20 has a corroded portion 30 at the ground portion 22 as shown in region P. As shown in FIG. In order to prevent further development of the corroded portion 30, it is necessary to prevent the corroded portion 30 from coming into contact with air and/or water. The lower part 21 may have low adhesiveness to the silicone rubber sealant 3 depending on its constituent material. For this reason, by covering the outer periphery of the area above the street lamp 20 from the ground part 22 with the self-bonding silicone rubber 2, a part of the street lamp 20 is siliconized, and the siliconized part and the ground surface A silicone rubber sealant 3 is formed. This prevents the silicone rubber sealant 3 from being easily peeled off from the lower portion 21 . The "sealing agent" may also be referred to as "sealing member" or "water stop material".

Next, the silicone rubber sealant 3 will be explained.

The silicone rubber sealant 3 is a sealing member obtained by vulcanizing a semi-solid curable silicone adhesive (also referred to as an "adhesive silicone rubber composition" or "adhesive silicone composition") and completely curing it. be. The silicone rubber sealant 3 can also be referred to as adhesive silicone rubber or adhesive silicone. Curable silicone adhesives are a type of solvent-free silicone adhesives that have high adhesive strength, as well as thermal stability, weather resistance, good water resistance, and excellent flexibility after curing. A rubber sealing agent 3 is obtained. A semi-solid curable silicone adhesive, also called a semi-cured adhesive silicone rubber composition, is capable of maintaining a self-supporting shape and has plasticity such that it can be deformed according to pressing force. Therefore, the semi-solid curable silicone adhesive can be deformed according to the irregularities and curved surfaces of the place where it is placed, and can be brought into close contact with the place where it is placed.

The curable silicone adhesive preferably has a Williams plasticity within the range of 50 to 500 at 25°C. The Williams plasticity is measured using a parallel plate plasticity meter (Williams plastometer) according to the measurement method specified in JIS K 6249 "Testing methods for uncured and cured silicone rubber". The curable silicone adhesive is a condensation reaction type curable silicone rubber composition, and preferably can be cured by a simple means of allowing it to react with moisture in the air by allowing it to stand at room temperature. The silicone elastomer obtained by curing a curable silicone adhesive (that is, the silicone rubber sealant 3) is preferably a moisture-curable silicone elastomer. The curable silicone-based adhesive may be an addition reaction-type curable silicone rubber composition that is cured by heating. In that case, the curable silicone-based adhesive consists of a heat-curable silicone-based elastomer. The condensation reaction type curable silicone rubber composition and the addition reaction type curable silicone rubber composition that serve as the adhesive sheet will be described in detail below.

(1) Condensation reaction type curable silicone rubber composition The condensation reaction type curable silicone rubber composition can be mainly composed of, for example, the following components.

(1-1) Organopolysiloxane Organopolysiloxane is the main component of the condensation reaction type curable silicone rubber composition, and is preferably diorganopolysiloxane represented by the following chemical formula (1) or chemical formula (2). It is siloxane. A chemical formula may also be referred to as an average composition formula.

In the chemical formulas (1) and (2) above, R is a monovalent hydrocarbon group. R is an alkyl group (methyl group, ethyl group, propyl group, butyl group, 2-ethylbutyl group, octyl group, etc.), cycloalkyl group (cyclohexyl group, cyclopentyl group, etc.), alkenyl group (vinyl group, propenyl group, butenyl group, heptenyl group, hexenyl group, allyl group, etc.), aryl group (phenyl group, tolyl group, xylyl group, naphthyl group, diphenyl group, etc.), aralkyl group (benzyl group, phenylethyl group, etc.), and the above carbonization Selected from those in which at least part of the hydrogen atoms bonded to the carbon atoms of the hydrogen group are substituted with halogens, cyano groups, etc. (chloromethyl group, trifluoropropyl group, 2-cyanoethyl group, 3-cyanopropyl group, etc.) one or more hydrocarbon groups can be mentioned. The number of carbon atoms in R is preferably 1-12, more preferably 1-10. In the above chemical formulas (1) and (2), A is an oxygen atom or a polymethylene group (including a methylene group) represented by -(CH ₂ ) _m - (m is 1 to 8). A is preferably an oxygen atom or an ethylene group.

In the above chemical formulas (1) and (2), n is an arbitrary number that makes the kinematic viscosity of component (1-1) at 25° C. fall within the range of 100 to 1,000,000 cm ² /s. More preferably, the kinematic viscosity is within the range of 500 to 500000 cm ² /s.

In the above chemical formulas (1) and (2), B is a hydrolyzable group. B includes an alkoxy group (methoxy group, ethoxy group, propoxy group, butoxy group, etc.), a ketoxime group (dimethylketoxime group, methylethylketoxime group, etc.), an acyloxy group (acetoxy group, etc.), an alkenyloxy group (isopropenyloxy group, isobutenyloxy group, etc.). Note that x in the above chemical formulas (1) and (2) is 2 or 3.

The above component (1-1) can be produced by a known method (for example, a method by equilibrium reaction using a cyclic siloxane or linear oligomer and an acid or base catalyst).

When introducing a branched structure into the diorganopolysiloxane as the component (1-1), a silane containing at least one of SiO _3/2 units and SiO _4/2 units or A method of adding siloxane to such an extent that the diorganopolysiloxane does not gel can be used. Regarding the component (1-1), it is preferable to use it after removing the low-molecular-weight siloxane by washing or the like in order to reduce contamination.

(1-2) Cross-Linking Agent As a cross-linking agent, a silane having two or more, preferably three or more hydrolyzable groups in one molecule, or a partially hydrolyzed condensate of the silane is used. Examples of hydrolyzable groups include alkoxy groups (methoxy group, ethoxy group, butoxy group, etc.), ketoxime groups (dimethylketoxime group, methylethylketoxime group, etc.), acyloxy groups (acetoxy group, etc.), alkenyloxy groups (iso propenyloxy group, isobutenyloxy group, etc.), amino group (N-butylamino group, N,N-diethylamino group, etc.), amide group (N-methylacetamide group, etc.). Among these, alkoxy groups, ketoxime groups, acyloxy groups and alkenyloxy groups are preferably used. The amount of the cross-linking agent is preferably in the range of 1 to 50 parts by mass, more preferably in the range of 2 to 30 parts by mass, more preferably 5 to 5 parts by mass, per 100 parts by mass of component (1-1). It is even more preferable to be within the range of 20 parts by mass.

(1-3) Curing Catalyst A curing catalyst is not essential, but curing of the curable silicone rubber composition can be accelerated by using a curing catalyst. Examples of curing catalysts include alkyltin ester compounds (dibutyltin diacetate, dibutyltin dilaurate, dibutyltin dioctoate, etc.), titanate esters or titanium chelate compounds (tetraisopropoxytitanium, tetra-n-butoxytitanium, tetrakis(2- ethylhexoxy)titanium, dipropoxybis(acetylacetona)titanium, titanium isopropoxyoctylene glycol, etc.), other suitable organometallic compounds (zinc naphthenate, zinc stearate, zinc-2-ethyloctoate, iron-2 -ethylhexoate, cobalt-2-ethylhexoate, manganese-2-ethylhexoate, cobalt naphthenate, alkoxyaluminum compounds, etc.), aminoalkyl group-substituted alkoxysilanes (3-aminopropyltriethoxysilane, N -β (aminoethyl)γ-aminopropyltrimethoxysilane, etc.), amine compounds or their salts (hexylamine, dodecylamine phosphate, etc.), quaternary ammonium salts (benzyltriethylammonium acetate, etc.), alkali metal lower fatty acids salt (potassium acetate, sodium acetate, lithium oxalate, etc.), alkali metal lower fatty acid salt, dialkylhydroxylamine (dimethylhydroxylamine, diethylhydroxylamine, etc.), silane or siloxane having a guanidyl group (tetramethylguanidylpropyl trimethoxysilane, tetramethylguanidylpropylmethyldimethoxysilane, tetramethylguanidylpropyltris(trimethylsiloxy)silane, etc.). These may be used alone or as a mixture of two or more. The amount of the curing catalyst is preferably in the range of 0 to 20 parts by mass, more preferably in the range of 0.001 to 10 parts by mass, per 100 parts by mass of component (1-1). More preferably, it is in the range of 0.01 to 5 parts by mass.

(1-4) Filler A filler is not essential, but can be suitably used for purposes such as reinforcement. Examples of fillers include reinforcing agents (fumed silica, precipitated silica, silica obtained by hydrophobizing the surface of these silicas with an organic silicon 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, celite, etc.). Among these, it is preferable to use silica, calcium carbonate and zeolite, and it is more preferable to use fumed silica and calcium carbonate whose surface has been hydrophobized. The amount of the filler to be blended can be selected according to the purpose and the type of filler, but it is in the range of 1 to 90% by volume and 5 to 60% by volume with respect to the component (1-1). preferably in

(1-5) Adhesion-imparting component An adhesion-imparting component is not essential, but is preferably used. Examples of adhesion imparting components include amino group-containing organoalkoxysilanes (γ-aminopropyltrimethoxysilane, γ-(2-aminoethyl)aminopropyltrimethoxysilane, etc.), epoxy group-containing organoalkoxysilanes (γ-glycan sidoxypropyltrimethoxysilane, etc.), mercapto-containing organoalkoxysilanes (γ-mercaptopropyltrimethoxysilane, etc.), reaction mixtures of amino group-containing organoalkoxysilanes and epoxy group-containing organoalkoxysilanes. The amount of the adhesiveness-imparting component is preferably in the range of 0.1 to 5 parts by weight per 100 parts by weight of component (1-1).

(2) Addition-curable silicone rubber composition When curing an addition-curable silicone rubber composition, the addition-curable silicone rubber composition is mainly composed of the following components. can.

(2-1) Organopolysiloxane Organopolysiloxane is the main component of addition-curable curable silicone rubber compositions and has an average of two or more alkenyl groups per molecule. Examples of alkenyl groups include vinyl, allyl, butenyl, pentenyl, hexenyl and heptenyl groups. Among these, it is preferable to use a vinyl group. In this component, examples of organic groups bonded to silicon atoms other than alkenyl groups include alkyl groups (methyl group, ethyl group, propyl group, butyl group, pentyl group, hexyl group, etc.), aryl groups (phenyl group , tolyl group, xylyl group, etc.), halogenated alkyl groups (3-chloropropyl group, 3,3,3-trifluoropropyl group, etc.). Among these, it is preferable to use a methyl group. Examples of the molecular structure of this component include a straight chain, a partially branched straight chain, a branched chain, a network, and a dendritic structure. The viscosity of this component at 25° C. is preferably 100000 mPa·s or more, more preferably 1000000 mPa·s or more.

Examples of the organopolysiloxane of this component include polydimethylsiloxane having both molecular chain ends blocked with dimethylvinylsiloxy groups, dimethylsiloxane-methylvinylsiloxane copolymer having both molecular chain ends blocked with dimethylvinylsiloxy groups, and trimethylsiloxy groups at both molecular chain ends. Blocked dimethylsiloxane/methylvinylsiloxane copolymer, a siloxane unit represented by (CH ₃ ) ₃ SiO _1/2 and a siloxane unit represented by (CH ₃ ) ₂ (CH ₂ =CH) SiO _1/2 and SiO _{4/ 2} , at least part of the methyl groups of these organopolysiloxanes are alkyl groups (ethyl group, propyl group, etc.), aryl groups (phenyl group, tolyl group, etc.), halogenated Organopolysiloxanes substituted with substituents selected from alkyl groups (3,3,3-trifluoropropyl groups, etc.), and at least part of the vinyl groups of these organopolysiloxanes are alkenyl groups (allyl groups, propenyl groups, etc.) substituted organopolysiloxanes and mixtures of two or more of these organopolysiloxanes can be used.

(2-2) Hydrogenated Organopolysiloxane Hydrogenated organopolysiloxane acts as a curing agent for addition-curing curable silicone rubber compositions, and has an average of 2 or more silicon-bonded hydrogen atoms per molecule. have Examples of silicon-bonded organic groups in this component include alkyl groups (methyl group, ethyl group, propyl group, butyl group, pentyl group, hexyl group, etc.), aryl groups (phenyl group, tolyl group, xylyl group, etc.). ), halogenated alkyl groups (3-chloropropyl group, 3,3,3-trifluoropropyl group, etc.). Among the above, it is preferable to use a methyl group. Examples of the molecular structure of this component include a straight chain, a partially branched straight chain, a branched chain, a network, and a dendritic structure. Although the viscosity of this component at 25° C. is not limited, it is preferably in the range of 1 to 1000000 mPa·s, more preferably in the range of 1 to 10000 mPa·s.

Examples of the hydrogenated organopolysiloxane of this component include polydimethylsiloxane blocked with dimethylhydrogensiloxy groups at both molecular chain terminals, polymethylhydrogensiloxane blocked with trimethylsiloxy groups at both molecular chain terminals, and dimethylsiloxane blocked with trimethylsiloxy groups at both molecular chain terminals. - A methylhydrogensiloxane copolymer, a cyclic polymethylhydrogensiloxane, an organopolysiloxane consisting of a siloxane unit represented by ( _CH3 )2HSiO1 _{/ 2} and a siloxane unit represented by SiO4 _/2 , and these organo At least part of the methyl groups of polysiloxane are alkyl groups (ethyl group, propyl group, etc.), aryl groups (phenyl group, tolyl group, etc.), halogenated alkyl groups (3,3,3-trifluoropropyl group, etc.) Substituted organopolysiloxanes and mixtures of two or more of these organopolysiloxanes can be used. Among these, since the mechanical properties (especially elongation) of the resulting cured product are improved, organopolysiloxane having silicon-bonded hydrogen atoms only at both ends of the molecular chain and silicon-bonded side chains of the molecular chain Mixtures with organopolysiloxanes are preferably used.

The content of this component in the addition-curing curable silicone rubber composition is such that the molar ratio of silicon-bonded hydrogen atoms in this component to alkenyl groups in component (2-1) is within the range of 0.01 to 20. The amount is preferably in the range of 0.1 to 10, more preferably in the range of 0.1 to 5. The reason for setting the above range is that if the content of this component is at least the lower limit of the above range, the adhesive silicone rubber tends to be sufficiently cured. This is because the cured adhesive sheet tends to have higher mechanical properties. When using a mixture of organopolysiloxane having silicon-bonded hydrogen atoms only at both ends of the molecular chain and organopolysiloxane having silicon-bonded side chains in the molecular chain as this component, the former organopolysiloxane The content of is preferably such that the molar ratio of silicon-bonded hydrogen atoms in component (2-1) to alkenyl groups in component (2-1) is in the range of 0.01 to 10, preferably 0.1 to An amount within the range of 10 is more preferable, and an amount within the range of 0.1 to 5 is even more preferable. The content of the latter organopolysiloxane should be such that the molar ratio of silicon-bonded hydrogen atoms in component (2-1) to alkenyl groups in component (2-1) is within the range of 0.5 to 20. is preferred, the amount in the range of 0.5 to 10 is more preferred, and the amount in the range of 0.5 to 5 is even more preferred.

(2-3) Curing Catalyst A curing catalyst is not essential, but a preferred example is a platinum-based catalyst for hydrosilylation reaction. Examples of platinum-based catalysts for hydrosilylation reactions include fine platinum powder, platinum black, chloroplatinic acid, alcohol-modified chloroplatinic acid, complexes of platinum and diketones, complexes of chloroplatinic acid and olefins, and chloroplatinic acid and alkenylsiloxanes. and complexes thereof, and those supported on carriers (alumina, silica, carbon black, etc.). Among these, it is preferable to use a complex of chloroplatinic acid and alkenylsiloxane because of its high catalytic activity. Further, it is more preferable to use a complex of chloroplatinic acid and divinyltetramethyldisiloxane. The amount of component (2-1) to be blended is preferably in the range of 1 to 1000 parts by mass, more preferably in the range of 1 to 100 parts by mass as platinum metal atoms, per 1,000,000 parts by mass of component (2-1). is more preferred.

(2-4) Fillers Fillers are preferably added in order to improve the mechanical strength of the addition-curing curable silicone rubber composition. compounds can be used. Examples of this component include fumed silica, precipitated silica, calcined silica, crushed quartz, and powder obtained by surface-treating these silica powders with organic silicon compounds (organoalkoxysilanes, organohalosilanes, organosilazanes, etc.). can be mentioned. In particular, in order to sufficiently improve the mechanical strength of the cured adhesive sheet, it is preferable to use silica powder having a BET specific surface area of 50 m ² /g or more as this component.

Addition of this component to the addition-curing curable silicone rubber composition is optional, but in order to improve the mechanical strength of the cured adhesive silicone rubber, the blending amount of this component should be (2-1). It is preferably in the range of 1 to 1,000 parts by mass, more preferably in the range of 1 to 400 parts by mass, based on 100 parts by mass of the component. The addition-curable silicone rubber composition may contain other optional components such as fumed titanium oxide, diatomaceous earth, iron oxide, aluminum oxide, aluminosilicate, calcium carbonate, zinc oxide, and aluminum hydroxide. of inorganic fillers and organic fillers. The addition-curing curable silicone rubber composition may contain fillers obtained by treating the surface of these fillers with the aforementioned organosilicon compounds. The amount of the filler compounded can be selected depending on the purpose and the type of filler, but it is in the range of 1 to 90% by volume and 5 to 60% by volume with respect to the component (2-1). Preferably.

(2-5) Adhesion-imparting component This component is not essential, but it is preferably used to impart and improve the adhesiveness of the addition-curing curable silicone rubber composition so that it functions as an adhesive. is possible. Examples of this component include silane coupling agents and partial hydrolysates thereof (methyltrimethoxysilane, vinyltrimethoxysilane, allyltrimethoxysilane, 3-methacryloxypropyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, silane, 3-aminopropyltrimethoxysilane, N-(2-aminoethyl)-3-aminopropyltrimethoxysilane, bis(trimethoxysilyl)propane, bis(trimethoxysilyl)hexane, etc.), epoxy group, acid An organic compound having an anhydride group and an α-cyanoacryl group, a siloxane compound having an epoxy group, an acid anhydride group and an α-cyanoacryl group, an epoxy group, an acid anhydride group and an α-cyanoacryl group and an alkoxysilyl groups, titanium compounds (tetraethyl titanate, tetrapropyl titanate, tetrabutyl titanate, tetra(2-ethylhexyl) titanate, titanium ethylacetonate, titanium acetylacetonate, etc.), aluminum compounds (ethylacetonate Acetate aluminum diisopropylate, aluminum tris(ethylacetoacetate), alkylacetoacetate aluminum diisopropylate, aluminum tris(acetylacetonate), aluminum monoacetylacetonate bis(ethylacetoacetate), etc.), zirconium compounds (zirconium acetylacetoacetate) zirconium butoxyacetylacetonate, zirconium bisacetylacetonate, zirconium ethylacetoacetate, etc.). As the above siloxane compound, lower aliphatic unsaturated groups such as alkenyl groups, acryloyl groups, and methacryloyl groups, or those having hydrosilyl groups in combination with these groups can be expected to effectively contribute to the improvement of adhesiveness. The content of the adhesion imparting component is not particularly limited, but is preferably in the range of 0.01 to 10 parts by weight per 100 parts by weight of component (2-1).

Furthermore, addition-curing curable silicone rubber compositions contain acetylenic compounds (3-methyl-1-butyn-3-ol, 3,5-dimethyl-1-hexyne- 3-ol, 3-phenyl-1-butyn-3-ol, etc.), enyne compounds (3-methyl-3-penten-1-yne, 3,5-dimethyl-3-hexene-1-yne, etc.), 1 Organosiloxane compounds having 5% by mass or more of vinyl groups in the molecule (1,3,5,7-tetramethyl-1,3,5,7-tetravinylcyclotetrasiloxane, 1,3,5,7-tetramethyl -1,3,5,7-tetrahexenylcyclotetrasiloxane, both molecular chain terminal silanol group-blocked methylvinylsiloxane, molecular chain both terminal silanol group-blocked methylvinylsiloxane/dimethylsiloxane copolymer, etc.), other curing inhibitors (triazoles such as benzotriazole, phosphines, mercaptans, hydrazines, etc.) are preferably contained. Although the content of these components is not limited, it is preferably in the range of 0.001 to 5 parts by mass per 100 parts by mass of component (2-1).

The method of preparing the addition-curing curable silicone rubber composition is not limited, and it can be prepared by mixing other optional components as necessary. 3) It is preferable to add the remaining components to the base compound prepared by heating and mixing the components. When adding other optional components, it may be added when preparing the base compound, and when other optional components are degraded by heating and mixing, the components (2-2) and (2- 4) It may be added when the ingredients are added. Further, when preparing the base compound, the surface of the component (2-3) may be treated in-situ by adding the organosilicon compound.

Next, the self-bonding silicone rubber 2 will be explained.

The self-bonding silicone rubber 2 is a cured product obtained by curing a silicone composition containing a diorganopolysiloxane represented by the following chemical formula (3) and a boric acid compound. The main differences between the self-bonding silicone rubber 2 and the above-described semi-solid curable silicone adhesive are the following two points.
One is that the self-bonding silicone rubber 2 is a cured product, whereas the semi-solid curable silicone adhesive is an unvulcanized product.
Another is that the self-bonding silicone rubber 2 contains a boric acid compound to exhibit self-bonding properties, whereas the semi-solid curable silicone adhesive does not necessarily contain a boric acid compound. is not necessary to include .

（式（３）におけるＲ^１は、炭素数１～１０の炭化水素基である。式（３）中のｎは、１．９８～２．０２である。）

(R ¹ in formula (3) is a hydrocarbon group having 1 to 10 carbon atoms. n in formula (3) is 1.98 to 2.02.)

R ¹ in formula (3) is a hydrocarbon group having 1 to 10 carbon atoms, preferably 1 to 8 carbon atoms. Examples of hydrocarbon groups include alkyl groups, cycloalkyl groups, alkenyl groups, and aryl groups. Examples of alkyl groups include methyl, ethyl, propyl, and butyl groups. Cycloalkyl groups include, for example, a cyclohexyl group and the like. Examples of alkenyl groups include vinyl groups, allyl groups, butenyl groups, and hexenyl groups. Aryl groups include, for example, a phenyl group and a tolyl group. R ¹ may also be a group in which some or all of the hydrogen atoms of the above hydrocarbon group have been substituted with a halogen atom, a cyano group, or the like. When curing the above silicone composition, if the curing is accelerated with an organic peroxide described later, R ¹ is an alkenyl group or some or all of the hydrogen atoms of the alkenyl group are substituted with a halogen atom or a cyano group. group is preferred. n in formula (3) ranges from 1.98 to 2.02. When n is within this range, better self-bonding properties are obtained.

The kinematic viscosity of the diorganopolysiloxane at 25° C. is preferably from 100 to 100,000,000 cSt, more preferably from 100,000 to 10,000,000 cSt. If the kinematic viscosity at 25°C of the diorganopolysiloxane is within the above range, the handling property before curing and the mechanical properties after curing are excellent.

Examples of boric acid compounds include boric acid and boric anhydride derivatives. Examples of boric acid include boric anhydride, pyroboric acid, and orthoboric acid. Derivatives of boric anhydride include, for example, trimethyl borate, triethyl borate, trimethoxyboroxine and the like. As the boric acid compound, a polyorganoborosiloxane obtained by condensing an organoalkoxysilane such as dimethyldimethoxysilane or dimethyldiethoxysilane with boric anhydride can also be used. A boric acid compound may be used individually by 1 type, and may use 2 or more types together.

The content of the boric acid compound in the silicone composition is preferably 0.1 to 50 parts by mass, more preferably 0.5 to 30 parts by mass, based on 100 parts by mass of diorganopolysiloxane. It is more preferably 1 to 5 parts by mass. If the content of the boric acid compound is at least the lower limit, sufficient self-adhesiveness can be ensured, and if it is at most the upper limit, deterioration of mechanical properties can be suppressed.

The silicone composition may contain an organic peroxide to facilitate curing of the silicone composition. Examples of organic peroxides include hydroperoxides, dialkyl peroxides, peroxyesters, diacyl peroxides, peroxydicarbonates and the like. One of these organic peroxides may be used alone, or two or more thereof may be used in combination.

The content of the organic peroxide in the silicone composition is preferably 0.1 to 10 parts by mass, more preferably 0.5 to 3.0 parts by mass, per 100 parts by mass of diorganopolysiloxane. more preferred. When the content of the organic peroxide is at least the above lower limit, curing can be sufficiently accelerated.

The thickness of the center of the self-bonding silicone rubber 2 in the width direction is preferably 0.5 to 1.5 mm, and the thickness of the ends of the self-bonding silicone rubber 2 in the width direction is preferably 0 to 0.5 mm. (In this case, 0 is not included.). The width of the self-bonding silicone rubber 2 is preferably 15-50 mm, more preferably 20-40 mm. If the width of the self-adhesive silicone rubber 2 is equal to or greater than the lower limit, the number of windings to the lower portion 21 can be reduced, making repair easier. Use can be suppressed.

The maximum tensile load of the self-bonding silicone rubber 2 is preferably 70N or more, more preferably 80N or more, and even more preferably 100N or more. The tensile elongation of the self-bonding silicone rubber 2 is preferably 300% or more, more preferably 400% or more, and even more preferably 500% or more. If the maximum tensile load and tensile elongation of the self-bonding silicone rubber 2 are at least the above lower limits, the self-bonding silicone rubber 2 can exhibit sufficiently high self-bonding properties. The above maximum tensile load and tensile elongation are values obtained by measuring the tape-shaped self-bonding silicone rubber 2 using a tensile tester under the conditions of 23° C. and tensile speed of 500 mm/min.

2. 3. Method for Forming Projection Damage Prevention Structure FIG. 3 shows a flow chart of each step of a method for forming a projection damage prevention structure according to an embodiment of the present invention and a diagram for explaining structural changes in each step.

The method of forming the projecting object damage prevention structure according to this embodiment is a method of forming the projecting object damage prevention structure 1 described above, and the outer periphery of the area above the street lamp 20 from the ground part 22 is covered with self-bonding silicone. A step of covering with rubber 2 (S100), and a bonding step of bonding semi-cured adhesive silicone rubber composition 3a to corroded portion 30 across self-bonding silicone rubber 2 and the surface of paved road 10. (S200) and a curing step (S300) of curing the semi-cured adhesive silicone rubber composition 3a to seal the corroded portion 30.

The method for forming the projection damage prevention structure includes a coating step (S100), an adhesion step (S200), and a curing step (S300). Hereinafter, a method for forming a projecting object damage prevention structure will be described with reference to the drawings.

(1) Coating step (S100)
This step is a step of covering the outer periphery of the area above the street lamp 20 from the ground part 22 with the self-bonding silicone rubber 2. It is a process of winding. The tape is preferably wound multiple times between the ground portion 22 and a predetermined position above it. The covering process may also be referred to as a winding process, which is a subordinate concept thereof. This step siliconizes the surface of a portion of the streetlight 20 (which may be referred to as a portion of the lower portion 21).

(2) Adhesion step (S200)
In this step, the semi-cured adhesive silicone rubber composition 3a is adhered to the corroded portion 30 across the self-bonding silicone rubber 2 and the surface of the paved road 10. As shown in FIG. 3 and later-described FIG. 4, the "adhesive silicone rubber composition" is referred to as "adhesive silicone rubber composition 3a". When the adhesive silicone rubber composition 3a is a condensation reaction type curable silicone rubber composition, the adhesive silicone rubber composition 3a is removed from the sealed bag, and the composition 3a is removed as quickly as possible. It is preferable that the surface of the self-bonding silicone rubber 2 and the surface of the paved road 10 are closely adhered so as to cover the corroded portion 30 .

(3) Curing step (S300)
In this step, the semi-cured adhesive silicone rubber composition 3a is cured to seal the corroded portion 30. As shown in FIG. The curing method differs depending on the type of adhesive silicone rubber composition 3a. For example, when the adhesive silicone rubber composition 3a is a condensation reaction type curable silicone rubber composition, it can be cured by being left in the air. When the adhesive silicone rubber composition 3a is an addition reaction type curable silicone rubber composition, it can be cured by heating. Thus, the semi-cured adhesive silicone rubber composition 3a is completely cured to become the silicone rubber sealant 3.

FIG. 4 shows a flow chart of each step of a method for forming a projecting object damage prevention structure according to a modification of the present invention.

The method for forming a projecting object damage prevention structure according to this modification includes a step of shaving the surface of the paved road 10 located around the corroded portion 30 and/or the surface of the paved road 10 located around the corroded portion 30 before the coating step (S100) described above. A step of applying a primer to the surface (S50) is included. In this application, application of the primer is also referred to as priming. Therefore, S50 is also called a keren treatment step and/or a primer treatment step. The term "cleaning treatment" may be replaced with "polishing treatment" or "surface cleaning treatment". The cleaning step and/or the primer treatment step (S50) may be performed after the coating step (S100) as long as it is a step performed prior to the bonding step (S200). S50 may be any of a step of cleaning treatment only, a step of primer treatment only, or a step of applying a primer after cleaning treatment.

3. Other Embodiments The present invention is not limited to the above-described embodiments, and can be modified in various ways. For example, the projecting object damage prevention structure and the method of forming the same can be applied to damaged portions of utility poles, road signs (also called traffic signs), fences, fire hydrants, traffic signals, etc., in addition to the streetlights 20 . Also, the graded surface may be a surface other than the paved road 10, for example, the surface of a foundation made of metal, ceramics, or concrete.

Further, in the previous embodiment, the silicone rubber sealant 3 is formed on the damaged portion of the projection represented by the street lamp 20, but the silicone rubber sealant 3 is formed on the easily damaged portion for the purpose of preventing damage. can be

INDUSTRIAL APPLICABILITY The present invention can be used in industries related to preventing damage to the ground of protrusions on graded surfaces.

1... Projection damage prevention structure, 2... Self-bonding silicone rubber, 3... Silicone rubber sealant, 3a... Adhesive silicone rubber composition, 10... Paved road (graded surface one example), 20... street lamp (an example of a projecting object, an example of a metal pole), 21... lower part (an example of the area above the projecting object from the ground level), 22... the ground level, 30 Corroded portion (an example of damaged portion).

Claims (2)

A protruding object damage prevention structure for preventing damage to a ground portion near the leveled surface in an artificial protruding object erected on the leveled surface,
a self-bonding silicone rubber that covers the outer periphery of the region above the protrusion from the ground portion;
a silicone rubber sealant that adheres to the damaged portion or the easily damaged portion across the self-adhesive silicone rubber and the leveling surface;
A method for forming a protrusion damage prevention structure, characterized by comprising:
A covering step of covering the outer periphery of the region above the protrusion from the ground portion with a self-bonding silicone rubber;
a bonding step of bonding an adhesive silicone rubber composition in a semi-cured state to a damaged or easily damaged portion straddling the self-bonding silicone rubber and the leveling surface;
a curing step of curing the semi-cured adhesive silicone rubber composition to seal the damaged portion or the easily damaged portion;
including
and/or applying a primer to the surface of the leveled surface located around the damaged portion or the easily damaged portion prior to the bonding step. A method for forming a product damage prevention structure. 2. The method of claim 1, wherein the protrusion is a metal pole.

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