JP2019173465A - Sticking method of sealant - Google Patents

Abstract

To provide a sticking method of a sealant capable of improving strength and reducing exfoliation without giving adverse effect on hardening performance and adhesive performance.SOLUTION: A sticking method of a sealant comprises: a seal layer sticking step (step S200) of sticking a moisture curable type seal layer 1 on a surface 11 of an adherend 10; a coating layer sticking step (step S300) of sticking a coating layer 2 having moisture permeability and higher strength than a hardening body of the seal layer 1 on a surface of the seal layer 1 after sticking the seal layer 1 and before hardening; and a seal layer hardening step (step S400) of curing the seal layer 1.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a method for applying a sealing material to an adherend.

  If the concrete, mortar surface, joints or joints are chipped, peeled or cracked, conventionally, a condensation reaction type adhesive or sealant is applied to the necessary places to improve waterproofness, waterstop or earthquake resistance. There has been a way to do it. Since the adhesive and the sealant are liquid at room temperature, they are suitable for filling a missing part or a cracked part. However, when covering over a wide area or covering relatively large cracks, joints or seams, the adhesive or sealant will result in reduced strength, uneven thickness, or open pinholes. Has the disadvantage of being difficult to understand.

  In order to overcome the above-mentioned drawbacks of liquid adhesives and sealants, silicone-based adhesives that are shaped into a self-supporting state in an uncured state are known (see, for example, Patent Document 1). The above-mentioned adhesive is very easy to use without the disadvantages of using a liquid adhesive or sealant when covering a relatively wide area or covering relatively large cracks, joints or joints. In addition, this type of adhesive, unlike liquid adhesives, has no problem of dripping immediately after the use of the adhesive until it is cured, and there is no need to expel an appropriate amount of adhesive from a container such as a tube. No.

Japanese Patent Laying-Open No. 2005-187686

  However, the adhesives as described above are required to be further improved when used as a sealing material. That is to further improve the strength as a sealing material and further reduce peeling. The area covered with the adhesive is easily recessed, perforated, or scratched when stones or construction materials come into contact with it. For this reason, there is a possibility that the quality of the repair work may be reduced. Further, in a place where the seam is peeled off or has a lot of unevenness on the old concrete surface, there is a possibility of peeling off with the strength of the adhesive alone.

  On the other hand, since the adhesive requires moisture at the time of curing, if a resin layer or a metal layer that does not transmit moisture is attached to the surface, the supply of moisture to the adhesive is not sufficiently performed. Cause poor curing.

  The present invention has been made in order to meet the above demands for improvement, and provides a sealing material sticking method capable of improving strength and reducing peeling without adversely affecting curing characteristics and adhesive performance. For the purpose.

(1) A sealing material sticking method according to an embodiment for achieving the above object includes a seal layer sticking step of sticking a moisture curing type seal layer to the surface of an adherend, and after sticking the seal layer. Before curing, a coating layer application process for applying a coating layer having moisture permeability and higher strength than the cured material of the sealing layer to the front side surface of the sealing layer, and sealing layer curing for curing the sealing layer And a process.

(2) In the sealing material sticking method according to another embodiment, preferably, the coating layer includes a mesh sheet, a fine porous sheet, or a fine foam sheet.

(3) In the method for attaching a sealing material according to another embodiment, preferably, the coating layer is made of glass cloth; carbon fiber cloth; aramid fiber, vinylon, polyester, urethane, polyamide, olefin, rayon, cotton or bamboo. A knitted cloth-like sheet; and a rubber / resin-impregnated layer that exposes rubber or resin on a contact surface with the seal layer.

(4) In the sealing material sticking method according to another embodiment, the rubber / resin-impregnated layer is preferably a silicone rubber-impregnated layer.

  ADVANTAGE OF THE INVENTION According to this invention, the sticking method of the sealing material which can improve an intensity | strength and can reduce peeling without having a bad influence on a hardening characteristic and adhesive performance can be provided.

FIG. 1 is a sectional view showing a flow of a sealing material sticking method according to an embodiment of the present invention. FIG. 2 shows a flowchart of the main steps of the sealing material sticking method according to the embodiment of the present invention. FIG. 3 shows a cross-sectional view (3A, 3B) of a situation in which various forms of coating layers are applied to the front side surface of the seal layer in the step (c) of FIG. FIG. 4 shows a cross-sectional view of a situation where a coating layer according to a modification of the coating layer of FIG.

  Embodiments of the present invention will be described below with reference to the drawings. In addition, each embodiment described below does not limit the invention which concerns on a claim. In addition, all of the elements and combinations described in the embodiments are not necessarily essential to the solving means of the present invention.

  FIG. 1 is a sectional view showing a flow of a sealing material sticking method according to an embodiment of the present invention. FIG. 2 shows a flowchart of the main steps of the sealing material sticking method according to the embodiment of the present invention. In the present application, the upper direction in FIG. 1 is referred to as the front and the lower direction is referred to as the back.

1. Sealing Material Affixing Method As shown in FIG. 2, the sealing material affixing method according to this embodiment includes a surface cleaning step (step S100), a seal layer affixing step (step S200), and a coating layer affixing step (step S300). ) And a seal layer curing step (step S400). The sealing material includes a seal layer and a coating layer. Hereinafter, each step will be described with reference to FIG.

(1) Surface cleaning process (step S100)
First, the surface 11 of the adherend 10 shown in FIG. 2A is cleaned by wiping with ethyl alcohol or the like. The adherend 10 is an object to which a seal layer (simply referred to as “seal layer”) 1 made of a semi-cured silicone composition or a modified silicone composition, which is an example of a sealing material, is attached. Examples of the adherend 10 include concrete, stone, and mortar buildings, walls, roads, bridges, and the like, but are not limited thereto. The surface 11 to which the seal layer 1 is affixed is, for example, a smooth surface, a concave surface having cracks or the like, or a rough repair surface that requires repair, but is not limited thereto, and may be a surface of another form. The surface cleaning process is an optional process, and in order to firmly adhere the seal layer 1 to the surface 11 of the adherend 10, dust, dust, oil, moisture, or various organic or inorganic substances that inhibit adhesion And the like. However, if the surface 11 is extremely clean, the surface cleaning process may not be performed.

(2) Seal layer application process (step S200)
This step is a step of sticking the seal layer 1 to the surface 11 of the adherend 10 as shown in FIG. In the step of applying the seal layer 1, it is preferable that the seal layer 1 and the surface 11 of the adherend 10 are closely adhered so that there is no air or less. In addition, Preferably, the primer application process of apply | coating the primer for making the seal layer 1 adhere easily to the surface 11 of the to-be-adhered body 10 can also be performed between a surface cleaning process and a seal layer sticking process.

(3) Covering layer pasting step (step S300)
As shown in FIG. 1 (c), this step has moisture permeability (also referred to as moisture permeability) on the front side surface of the seal layer 1 after the seal layer 1 is pasted and before its curing. In this step, the coating layer 2 having a higher strength than the cured body of the seal layer 1 is applied. The detailed structure and variations of the coating layer 2 will be described later.

  The covering layer 2 may have the same shape as the sealing layer 1 in plan view, but may be slightly smaller or larger than the sealing layer 1. The area ratio (C / S) of the area (C) of the coating layer 2 to the area (S) of the seal layer 1 is preferably 0.8 to 1.2, more preferably 0.9 to 1.1. The ratio (Tc / Ts) of the thickness (Tc) of the coating layer 2 to the thickness (Ts) of the cured body 1a of the sealing layer is preferably 0.1 to 1.0, more preferably 0.2 to 0.7. As Tc / Ts increases, it contributes to improving the strength, while decreasing moisture permeability from the outside to the sealing layer 1 and may be disadvantageous for curing the sealing layer 1. From the viewpoint of achieving both strength improvement and the effect of curing on the seal layer 1, Tc / Ts is preferably set in the above range.

(4) Seal layer curing step (step S400)
This step is a step of curing the seal layer 1 as shown in FIG. By allowing the sealing layer 1 to be ventilated from the outside through the coating layer 2 so that moisture in the air can be supplied to the sealing layer 1, the sealing layer 1 is cured and becomes a cured body 1a.

2. Seal Layer The seal layer 10 is, in a broad sense, a semi-solid (also referred to as semi-cured) moisture curable composition layer. Although there is no restriction | limiting in particular about the component, As an example, the material which consists of the following condensation reaction type silicone type or modified silicone type compositions can be mentioned. However, the sealing layer 1 may be a semi-solid layer using a curable composition other than a silicone-based or modified silicone-based material such as a moisture curable urethane rubber composition. As an example, the modified silicone-based composition refers to a composition obtained by modifying the molecular terminal of a polyether-based oligomer with silicone. The modified silicone-based sealing material causes a curing reaction due to moisture, like the silicone-based sealing material. The condensation reaction type silicone-based or modified silicone-based composition may be referred to as a one-component condensation-curable silicone sealant or a one-component condensation-type modified silicone sealant. The seal layer 10 absorbs moisture and is cured through a deoxime reaction, a dealcoholization reaction, a deacetic acid reaction, or the like.

  Suitable examples of the condensation reaction type composition constituting the sealing layer 10 are mainly composed of the following components.

(A) Organopolysiloxane A main component of the condensation reaction type composition, which is a diorganopolysiloxane represented by the following chemical formula (1) or (2).

In the above chemical formulas (1) and (2), R is a monovalent hydrocarbon group. R includes 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 a part of the hydrogen atoms bonded to the carbon atoms of the hydrogen group are substituted with halogen or cyano group (chloromethyl group, trifluoropropyl group, 2-cyanoethyl group, 3-cyanopropyl group, etc.) One or more hydrocarbon groups may be mentioned. The carbon number of R is preferably 1-12, and 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 said chemical formula (1), (2), n is arbitrary numbers which make the kinematic viscosity in 25 degreeC of the (a) component in the range of 100-1 million cm < ² > / s. The kinematic viscosity is more preferably in the range of 500 to 500,000 cm ² / s.

  In the above chemical formulas (1) and (2), B is a hydrolyzable group. Examples of B include alkoxy groups (methoxy group, ethoxy group, propoxy group, butoxy group, etc.), ketoxime groups (dimethyl ketoxime group, methylethyl ketoxime group, etc.), acyloxy groups (acetoxy group, etc.), alkenyloxy groups (isopropenyloxy). Group, isobutenyloxy group, etc.). In the above chemical formulas (1) and (2), x is 2 or 3.

The component (a) can be produced by a 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). In addition, when a branched structure is introduced into the diorganopolysiloxane which is the component (a), a silane or siloxane containing at least one of SiO _3/2 units and SiO _4/2 units is _{usually used} during polymerization. A method of adding diorganopolysiloxane to such an extent that it does not gel can be used. The component (a) is preferably used after removing low-molecular siloxane by washing or the like in order to reduce dirt.

(B) Crosslinking agent As a crosslinking agent, the silane which has 2 or more, preferably 3 or more hydrolyzable groups in 1 molecule, or the partial hydrolysis-condensation product of the said silane is used. Examples of hydrolyzable groups include alkoxy groups (methoxy group, ethoxy group, butoxy group, etc.), ketoxime groups (dimethyl ketoxime group, methylethyl ketoxime group, etc.), acyloxy groups (acetoxy group, etc.), alkenyloxy groups (iso A propenyloxy group, an isobutenyloxy group, etc.), an amino group (N-butylamino group, N, N-diethylamino group, etc.), and an amide group (N-methylacetamide group, etc.). In these, it is preferable to use an alkoxy group, a ketoxime group, an acyloxy group, and an alkenyloxy group. The blending amount of the crosslinking agent is preferably in the range of 1 to 50 parts by weight, more preferably in the range of 2 to 30 parts by weight, with respect to 100 parts by weight of component (a), and 5 to 20 parts by weight. Even more preferably within the range of parts.

(C) Curing catalyst A curing catalyst is not essential, but curing can be promoted by using a curing catalyst. Examples of curing catalysts include alkyl tin ester compounds (dibutyl tin diacetate, dibutyl tin dilaurate, dibutyl tin dioctoate, etc.), titanate esters or titanium chelate compounds (tetraisopropoxy titanium, tetra n-butoxy titanium, tetrakis (2- Ethylhexoxy) titanium, dipropoxybis (acetylacetona) titanium, titanium isopropoxyoctylene glycol, etc.) and other suitable organometallic compounds (zinc naphthenate, zinc stearate, zinc-2-ethyl octoate, iron-2) -Ethylhexoate, cobalt-2-ethylhexoate, manganese-2-ethylhexoate, cobalt naphthenate, alkoxyaluminum compound, etc.), aminoalkyl group-substituted alkoxysilane (3-aminopropyltrie) Xysilane, N-β (aminoethyl) γ-aminopropyltrimethoxysilane, etc.), amine compounds or salts thereof (hexylamine, dodecylamine phosphate, etc.), quaternary ammonium salts (benzyltriethylammonium acetate, etc.), alkali metals Lower fatty acid salts (potassium acetate, sodium acetate, lithium oxalate, etc.), lower fatty acid salts of alkali metals, dialkylhydroxylamine (dimethylhydroxylamine, diethylhydroxylamine, etc.), silane or siloxane having a guanidyl group (tetramethyl group) Anidylpropyltrimethoxysilane, tetramethylguanidylpropylmethyldimethoxysilane, tetramethylguanidylpropyltris (trimethylsiloxy) silane, and the like. These may be used alone or as a mixture of two or more. The blending 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 with respect to 100 parts by mass of the component (a). It is still more preferable that it exists in the range of 01-5 mass parts.

(D) Filler The filler is not essential, but can be suitably used for the purpose of reinforcement or the like. Examples of fillers include reinforcing agents (fumed silica, precipitated silica, silica whose surface is hydrophobized with an organosilicon compound, quartz powder, talc, zeolite, bentonite, etc.), fibrous filler ( Asbestos, glass fiber, organic fiber, etc.) and basic fillers (calcium carbonate, zinc carbonate, zinc oxide, magnesium oxide, celite, etc.). Of these, silica, calcium carbonate and zeolite are preferably used, and fumed silica and calcium carbonate having a hydrophobic surface are more preferably used. Although the compounding quantity of the said filler can be selected with the objective and the kind of filler, it exists in the range of 1-90 volume% with respect to (a) component, and exists in the range of 5-60 volume%. It is preferable.

(E) Adhesiveness imparting component The adhesiveness imparting component is not essential, but is preferably used. Examples of the adhesion-imparting component include amino group-containing organoalkoxysilanes (γ-aminopropyltrimethoxysilane, γ- (2-aminoethyl) aminopropyltrimethoxysilane, etc.), epoxy group-containing organoalkoxysilanes (γ-glycol). Sidoxypropyltrimethoxysilane and the like), mercapto-containing organoalkoxysilane (γ-mercaptopropyltrimethoxysilane and the like), and a reaction mixture of an amino group-containing organoalkoxysilane and an epoxy group-containing organoalkoxysilane. It is preferable that the compounding quantity of an adhesive provision component exists in the range of 0.1-5 mass parts with respect to 100 mass parts of (a) component.

3. Coating Layer The coating layer 2 is preferably a layer that improves the strength of the cured body 1a of the seal layer 1 and can reduce the peeling off from the adherend 10, and can be adhered to the seal layer 1 and It is a layer which can realize hardening of seal layer 1 after covering. The coating layer 2 is required to be able to permeate moisture necessary for curing the seal layer 1 and to allow reaction products (oxime, alcohol, acetic acid, etc.) generated by the condensation reaction of the seal layer 1 to permeate and be discharged to the outside. . The covering layer 2 may be a layer formed of any material and with any thickness as long as the above function can be exhibited. More preferably, the covering layer 2 includes a mesh sheet, a fine porous sheet, or a fine foamed sheet, and has a silicone rubber sheet or a silane coupling agent layer on the contact surface with the sealing layer 1. In addition to silicone rubber, other rubbers such as urethane rubber and acrylic rubber, or various resins may be brought into contact with the mesh sheet, the fine porous sheet, or the fine foam sheet.

  A fine perforated sheet (also simply referred to as a perforated sheet) is a sheet having a lower aperture ratio than a mesh sheet. A fine foam sheet (also simply referred to as a foam sheet) is a sheet in which holes are three-dimensionally dispersed in a sheet and a tunnel-shaped through path is formed by at least partial connection between holes. The above sheet such as a reticulated sheet has a water permeability measured by JIS Z 8806 of 2 ng / (m · s · Pa) or more, preferably 5 ng / (m) so as not to hinder the hardening of the seal layer 1. It is preferable that it is s · Pa) or more. The mesh-like sheet, finely perforated sheet, or finely foamed sheet is preferably excellent in flexibility, stretchability, and followability to the unevenness of the surface 11 of the adherend 10. This is because the repaired portion often has a complicated surface state having a seam, a joint missing, a large step, or a depression.

  The silicone rubber sheet is mainly composed of a cured silicone rubber, that is, a cured silicone rubber. As long as the silicone rubber sheet is a silicone rubber layer having a siloxane bond as a main skeleton, the silicone rubber sheet is obtained using a composition containing a curable organopolysiloxane that can be cured by a condensation reaction, or can be cured by an addition reaction. It is not ask | required whether it was obtained using the composition containing various curable organopolysiloxane. The coating layer 2 may include the silicone rubber sheet, and the silicone rubber sheet may include a heat insulating material having higher heat insulating properties. The covering layer 2 is a layer containing at least one of glass cloth; carbon fiber cloth; aramid fiber, vinylon, polyamide, polyester, urethane, olefin, rayon, cotton or bamboo woven cloth sheet; A silicone rubber-impregnated layer that exposes the silicone rubber may be provided on the contact surface with the seal layer 1. The coating layer 2 may be one in which the cloth is impregnated or coated with a resin. The covering layer 2 may be a layer made of a metal mesh, a wire mesh, a plurality of wires or a belt, instead of the mesh sheet or the foamed sheet. The mesh sheet and the fine perforated sheet are preferably made of resin, rubber or metal. In addition to the reticulated sheet and fine perforated sheet, if the sheet to be coated or impregnated is made of a relatively soft and flexible material, the laminate of the seal layer 1 and the cover layer 2 is stuck to the concrete and sealed. After the layer 1 is cured, the constituent elements of the covering layer 2 flexibly expand and contract even if concrete vibration occurs. Therefore, there is little risk of causing a crack in the cured body 1a of the seal layer 1. Hereinafter, the coating layer 2 will be exemplified with reference to the drawings.

  FIG. 3 shows a cross-sectional view (3A, 3B) of a situation in which various forms of coating layers are applied to the front side surface of the seal layer in the step (c) of FIG.

  The coating layer 2 shown in (3A) is a layer in which a silicone rubber sheet 21, a glass cloth 22, and a silicone rubber sheet 23 are laminated in this order from the back side surface in contact with the seal layer 1 to the front side surface. The covering layer 2 is stuck so that the silicone rubber sheet 21 is brought into contact with the surface on the front side of the seal layer 1 before curing. For this reason, even after the sealing layer 1 is cured, the possibility that the coating layer 2 is peeled off from the cured body 1a of the sealing layer 1 is low. Moreover, since the coating layer 2 is a layer having a glass cloth 22 that is an example of a mesh-like sheet, the coating layer 2 is superior in strength and moisture permeability to the cured body 1a of the sealing layer 1. For this reason, there is no hindrance to hardening of the sealing layer 1, and the laminated body of the coating layer 2 and the hardening body 1a is excellent in both the effect of increasing the strength and reducing the peeling than the hardening body 1a alone.

  The covering layer 2 may have a two-layer structure of the silicone rubber sheet 21 and the glass cloth 22, a two-layer structure of the glass cloth 22 and the silicone rubber sheet 23, or a single-layer structure of the glass cloth 22. The covering layer 2 may be a multilayer structure having more than three layers. However, as will be described later, when the coating layer 2 has a form in which the silicone rubber sheet 21 is not brought into contact with the seal layer 1, the silane coupling agent is easily represented between the coating layer 2 and the seal layer 1. The covering layer 2 and the sealing layer 1 are preferably pasted so as to interpose the adhesive layer.

  The coating layer 2 shown in (3B) is an aramid fiber layer 24, which is a silicone rubber-impregnated layer (an example of a rubber / resin-impregnated layer) that exposes silicone rubber on the contact surface with the seal layer 1, and a silicone rubber sheet 21 has an aramid fiber layer 24 embedded therein. The covering layer 2 includes an aramid fiber layer 24 which is an example of a mesh sheet, and is superior in strength and moisture permeability to the cured body 1a of the sealing layer 1. The covering layer 2 may include at least one of a carbon fiber cloth; a cloth sheet knitted with vinylon, polyester, urethane, olefin, rayon, cotton, or bamboo, instead of the aramid fiber layer 24. The coating layer 2 of (3B) has a silicone rubber sheet 21 on the surface in contact with the sealing layer 1. For this reason, even after the sealing layer 1 is cured, the possibility that the coating layer 2 is peeled off from the cured body 1a of the sealing layer 1 is low.

  However, the coating layer 2 may be provided with a rubber / resin impregnated layer that exposes rubber or resin other than silicone rubber on the contact surface with the seal layer 1 without providing the silicone rubber sheet 21. Thus, by sticking the coating layer 2 in a form in which a fibrous sheet such as an aramid fiber layer 24 is embedded in a rubber or resin other than the silicone rubber sheet 21 or silicone rubber on the seal layer 1, The following effects can be obtained. First, since the rubber / resin-impregnated layer is rich in stretchability, it is easy to attach the coating layer 2 to the sealing layer 1 even if the bonding surface of the coating layer 2 to the sealing layer 1 is uneven. Further, since the rubber / resin impregnated layer (particularly, the silicone rubber sheet 21) has higher moisture permeability than metal or the like, it is difficult to prevent the sealing layer 1 from being cured. Further, since the covering layer 2 is provided with a fibrous sheet such as an aramid fiber layer 24, a glass cloth, a carbon fiber cloth or the like, the strength of the sealing material, particularly the tensile strength and tear strength can be increased. it can.

  FIG. 4 shows a cross-sectional view of a situation where a coating layer according to a modification of the coating layer of FIG.

  Unlike the coating layer 2 of FIG. 3 (3B), the coating layer 2 of FIG. 4 contains the heat insulating material 25 with higher heat insulation than the silicone rubber sheet 21 in the silicone rubber sheet 21. FIG. Instead of the heat insulating material 25, fillers of the electromagnetic wave shielding material 25, the ultraviolet absorbing material 25, and the ultraviolet reflecting material 25 can be used. Further, the ultraviolet absorbing material 25 or the ultraviolet reflecting material 25 may be coated on the surface of the silicone rubber sheet 21. The shape of the filler may be any of granular, acicular, fibrous, plate-like and the like. In order to improve the adhesion between the sealing layer 1 and the coating layer 2, the filler may be contained only in the front side surface of the aramid fiber layer 24, and may not be contained in the back side surface of the layer 24. good. Furthermore, also in the example of FIG. 4, the coating layer 2 is provided with a rubber / resin impregnated layer that exposes rubber or resin other than silicone rubber on the contact surface with the seal layer 1 without the silicone rubber sheet 21. Also good.

(Other embodiments)
The preferred embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments and can be implemented with various modifications.

  For example, you may affix on the sealing layer 1 what laminated | stacked the 2 or more coating layers 2 disclosed by FIG. The heat insulating material (or electromagnetic wave shielding material) 25 in FIG. 4 may be dispersed in at least one of the sheets 21 and 23 constituting the coating layer 2 in FIG. 3 (3A).

  The present invention can be used, for example, for repair using a sealing material.

DESCRIPTION OF SYMBOLS 1 ... Seal layer (a part of sealing material), 1a ... Hardened body (hardened body of sealing layer), 2 ... Covering layer (a part of sealing material), 10 ... Adhesion Body, 11 ... surface, 21 ... silicone rubber sheet, 22 ... glass cloth (an example of mesh sheet), 23 ... silicone rubber sheet, 24 ... layer of aramid fibers (network sheet) ), 25... Heat insulating material (or ultraviolet absorbing material or ultraviolet reflecting material).

Claims (4)

A seal layer sticking step of sticking a moisture curing type seal layer on the surface of the adherend;
After applying the seal layer and before curing, a coating layer application step for attaching a coating layer having moisture permeability and higher strength than the cured body of the seal layer to the surface on the front side of the seal layer;
A seal layer curing step for curing the seal layer;
A method of applying a sealing material including:   The sealing material sticking method according to claim 1, wherein the coating layer includes a mesh sheet, a fine porous sheet, or a fine foam sheet.   The coating layer is a layer comprising at least one of: glass cloth; carbon fiber cloth; aramid fiber, vinylon, polyamide, polyester, urethane, olefin, rayon, cotton or bamboo woven cloth sheet; The sealing material sticking method according to claim 1, further comprising a rubber / resin-impregnated layer that exposes rubber or resin on a contact surface with the seal layer.   4. The sealing material sticking method according to claim 3, wherein the rubber / resin impregnated layer is a silicone rubber impregnated layer.