JP2019143753A - Silicone-base seal material - Google Patents

Abstract

To provide a silicone-base seal material that can maintain cleanliness at a surface of a seal layer without adversely affecting on setting property.SOLUTION: A silicone-base seal material 1 includes: a seal layer 10 made of a self-adhesive silicone rubber; and a coating layer 11a that is a layer for covering the seal layer 10 and covers the seal layer so that water content in the atmospheric air is permeable toward the seal layer 10. The silicone-base seal material includes the coating layer 11a on at least a surface on an opposite to a surface where the seal layer 10 comes into contact with a seal portion.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a silicone-based sealing material that seals holes, gaps, or dents.

  2. Description of the Related Art Conventionally, a silicone-based adhesive shaped into a self-standing shape in an uncured state is known (see, for example, Patent Document 1). This type of adhesive, unlike a liquid adhesive, has no problem of dripping immediately after the adhesive is used until it is cured, and there is no need to discharge an appropriate amount of adhesive from a container such as a tube. For this reason, the silicone-based adhesive is suitably used for sealing gaps generated during construction of, for example, concrete buildings, or for sealing holes and cracks generated with the aging of the buildings. Yes.

  A typical example of the silicone-based adhesive is a moisture-curing type silicone rubber layer, which is formed into a sheet shape or a string shape having a narrower width. The silicone rubber layer includes a film-like base material on one or both adhesive surfaces. The silicone adhesive provided with a film-like substrate is enclosed in a moisture-proof bag during storage, and is taken out of the moisture-proof bag during use. Each of the base material and the moisture-proof bag has a function of preventing the silicone rubber layer from absorbing moisture and curing.

Japanese Patent Laying-Open No. 2005-187686

  However, the silicone-based adhesive is required to be further improved when used as a seal layer. That is, after the seal layer made of a curable silicone rubber composition is applied to the repair site, the uncured seal layer is exposed to the atmosphere, so that dust in the atmosphere easily adheres to the surface of the seal layer. The surface may become dirty. In order to prevent adhesion of dust and the like, a method of attaching a current film-like substrate until the seal layer is cured is also conceivable. However, if the film-like substrate is attached to the surface of the seal layer, the supply of moisture to the seal layer is also blocked, and it takes a long time for the seal layer to be hardened or hardened.

  The present invention has been made to meet the above demand for improvement, and an object of the present invention is to provide a silicone-based sealing material that can keep the surface of the sealing layer clean without adversely affecting the curing characteristics.

(1) A silicone-based sealing material according to an embodiment for achieving the above object includes a self-adhesive silicone rubber sealing layer and a layer covering the sealing layer, and passes moisture in the atmosphere toward the sealing layer. A covering layer that covers the sealing portion, and the covering layer is provided at least on a surface of the sealing layer that is opposite to the surface that contacts the sealing portion.

(2) In the silicone-based sealing material according to another embodiment, preferably, the coating layer is a film base material that is peeled off after the sealing layer is cured, and the film base material is a porous material provided with a plurality of through-holes leading to the thickness direction. A conductive film substrate.

(3) In the silicone-based sealing material according to another embodiment, preferably, the porous film substrate is a through-hole region having a through-hole in at least a surface in contact with the seal layer, and a region other than the through-hole region. A non-through-hole region not provided with a through-hole.

(4) In the silicone-based sealing material according to another embodiment, preferably, the coating layer is provided only on the surface opposite to the surface in contact with the sealing portion, and the coating layer is a cured silicone rubber layer. .

(5) The silicone-based sealing material according to another embodiment preferably includes a plurality of through-holes penetrating in the thickness direction in a cured silicone rubber layer.

  According to the present invention, in the silicone-based sealing material, the surface of the sealing layer can be kept clean without adversely affecting the curing characteristics.

FIG. 1 is a perspective view (1A) of a silicone-based sealing material according to a first embodiment of the present invention and a cross-sectional view taken along line AA when the sealing material is cut along line AA in (1A) (1B). ) Respectively. FIG. 2 is a perspective view (2A) of a silicone-based sealing material according to a second embodiment of the present invention, and a cross-sectional view taken along line AA when the sealing material is cut along line AA in (2A) (2B). ) Respectively. FIG. 3 is a perspective view of a silicone-based sealing material according to the third embodiment of the present invention. FIG. 4: is a perspective view (4A) of the silicone type sealing material which concerns on 4th Embodiment of this invention, AA sectional view (4B) at the time of cut | disconnecting this sealing material by the AA line in (4A) ) And (4A) are perspective views (4C) of modified examples of the silicone-based sealing material. FIG. 5: shows the perspective view of the silicone type sealing material which concerns on 5th Embodiment, and the enlarged view of the part C. 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.

(First embodiment)

  FIG. 1 is a perspective view (1A) of a silicone-based sealing material according to a first embodiment of the present invention and a cross-sectional view taken along line AA when the sealing material is cut along line AA in (1A) (1B). ) Respectively.

  A silicone-based sealing material (hereinafter also simply referred to as “sealing material”) 1 according to the first embodiment is a self-adhesive silicone rubber sealing layer 10 and a layer covering the sealing layer 10 and facing the sealing layer 10. And a coating layer 11a that coats moisture in the atmosphere so that it can pass through. The covering layer 11a is provided at least on the surface opposite to the surface where the sealing layer 10 is in contact with the sealing portion. In this embodiment, the coating layer 11 a is a film-like base material (hereinafter referred to as “film-like base material”) 11 that peels after the sealing layer 10 is cured. The coating layer 11a which is one of the film base materials 11 is a porous film base material provided with a plurality of through-holes 13 communicating in the thickness direction as shown in the enlarged view of the B part. In this embodiment, the porous film base material is provided with the through-holes 13 distributed substantially uniformly over the entire surface in plan view. Here, a region where the through holes 13 are densely packed is referred to as a “through hole region 15”.

  On the other hand, the surface where the seal layer 10 is in contact with the seal site is covered with the film 11b. The film 11 b is one of the film base materials 11 and does not include the through hole 13. When affixing the seal layer 10 to a repaired part (also referred to as a seal part) of the concrete structure, the user of the sealant 1 peels off the film 11b that does not include the through-hole 13 from the seal layer 10, and The seal layer 10 is affixed to the seal portion, and after the seal layer 10 is cured, the coating layer 11a is peeled off from the cured body of the seal layer 10. By not peeling off the coating layer 11a until the seal layer 10 is cured, it is possible to supply moisture in the atmosphere to the seal layer 10 and suppress adhesion of dust or the like to the surface of the seal layer 10. The elements constituting the sealing material 1 are rectangular in a plan view, but may be any shape such as a triangle, a polygon more than a pentagon, a circle, and an ellipse.

(1) Seal Layer The seal layer 10 is a semi-solid (also referred to as semi-cured) moisture-curing silicone rubber shaped into a sheet shape. Although there is no restriction | limiting in particular about the component, As an example, the material which consists of the following condensation reaction type self-adhesive silicone rubber can be mentioned. The condensation reaction type self-adhesive silicone rubber that preferably constitutes the seal layer 10 is mainly composed of the following components.

(A) Organopolysiloxane A main component of a condensation reaction type self-adhesive silicone rubber, 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, methyl ethyl 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 Although a curing catalyst is not essential, hardening of self-adhesive silicone rubber can be accelerated | stimulated 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.), alkali metal lower fatty acid salts, 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). And a reaction mixture of a mercapto-containing organoalkoxysilane (γ-mercaptopropyltrimethoxysilane and the like), 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.

(2) Film Base Material The film base material 11 can be peeled off from the seal layer 10. Although the film base material 11 is not inseparable from the seal layer 10, it is made of a material that adheres to the seal layer 10 to such an extent that it does not easily peel off. The film substrate 11 includes a coating layer 11a and a film 11b. In use, the coating layer 11a is attached to the seal layer 10 until the seal layer 10 is cured to a desired hardness. The film 11b is peeled off from the seal layer 10 at a stage before the seal layer 10 is applied to the seal site.

  As a constituent material of the film substrate 11, olefin-based, polyester-based, and polycarbonate-based resins are preferable, polypropylene (PP) is particularly preferable, and biaxially stretched polypropylene (OPP) is even more preferable. The film base 11 is preferably of a size suitable for gripping a part of the film base 11 and peeling it from the seal layer 10. For example, the film base 11 is larger than the seal layer 10 over the entire periphery in a plan view of the seal layer 10 or only part of the film base 11 protrudes from the periphery of the seal layer 10 in a plan view from the viewpoint of ease of peeling. It is preferable.

(Second Embodiment)
Next, a silicone-based sealing material according to the second embodiment of the present invention will be described. In 2nd Embodiment, about the component which is common in 1st Embodiment, the same code | symbol is attached | subjected and the overlapping description is abbreviate | omitted.

  FIG. 2 is a perspective view (2A) of a silicone-based sealing material according to a second embodiment of the present invention, and a cross-sectional view taken along line AA when the sealing material is cut along line AA in (2A) (2B). ) Respectively.

  A silicone-based sealing material according to the second embodiment (referred to as a “sealing material” as in the first embodiment) 1a is a self-adhesive silicone rubber sealing layer 10 and a layer covering the sealing layer 10 and sealing. And a coating layer 11 a that covers moisture in the atmosphere so as to pass toward the layer 10. The covering layer 11a is provided at least on the surface opposite to the surface where the sealing layer 10 is in contact with the sealing portion. In this embodiment, as in the first embodiment, the coating layer 11 a is the film substrate 11 that peels after the sealing layer 10 is cured. The coating layer 11a which is one of the film base materials 11 is a porous film base material provided with a plurality of through-holes 13 penetrating in the thickness direction as shown in the enlarged view of part B. In this embodiment, unlike the first embodiment, the porous film substrate has a through-hole region 15 having a through-hole 13 on at least a surface in contact with the seal layer 10 and a region other than the through-hole region 15 and a through-hole. And a non-through-hole region 16 that does not include 13. In this embodiment, the through-hole region 15 is equal to or slightly larger than the area of the seal portion of the seal layer 10. When the through-hole region 15 is brought into contact with at least one region of the seal layer 10, moisture is supplied to the seal layer 10 through the through-holes 13 of the porous film substrate and the seal layer 10 until the seal layer 10 is cured. It is possible to effectively prevent dust and the like from adhering to 10.

(Third embodiment)
Next, a silicone-based sealing material according to a third embodiment of the present invention will be described. In the third embodiment, components that are the same as those in each of the above-described embodiments are given the same reference numerals, and redundant descriptions are omitted.

  FIG. 3 is a perspective view of a silicone-based sealing material according to the third embodiment of the present invention.

  A silicone-based sealing material according to the third embodiment (referred to as a “sealing material” as in the previous embodiments) 1b is a self-adhesive silicone rubber sealing layer 10 and a layer covering the sealing layer 10. Coating layers 11 a and 11 a that cover moisture in the atmosphere so as to be able to pass toward the seal layer 10. The coating layers 11a and 11a are provided on both surfaces of the surface opposite to the surface where the seal layer 10 contacts the seal portion. When using the sealing material 1b configured to sandwich the sealing layer 10 between the coating layers 11a and 11a, the user of the sealing material 1b peels only one coating layer 11a and seals the exposed surface of the sealing layer 10 Affixed to the site and the sealing layer 10 is cured, the remaining coating layer 11a is peeled off from the cured body of the sealing layer 10. The sealing material 1b is superior to the sealing materials 1 and 1a according to the previous embodiments in that there is no problem in use even if the covering layer 11a on either surface of the sealing layer 10 is peeled off.

(Fourth embodiment)
Next, a silicone-based sealing material according to a fourth embodiment of the present invention will be described. In the fourth embodiment, components that are the same as those in each of the above-described embodiments are given the same reference numerals, and redundant descriptions are omitted.

  FIG. 4: is a perspective view (4A) of the silicone type sealing material which concerns on 4th Embodiment of this invention, AA sectional view (4B) at the time of cut | disconnecting this sealing material by the AA line in (4A) ) And (4A) are perspective views (4C) of modified examples of the silicone-based sealing material.

  A silicone-based sealing material according to the fourth embodiment (referred to as a “sealing material” as in the previous embodiments) 1c is a self-adhesive silicone rubber sealing layer 10 and a layer covering the sealing layer 10. And a covering layer 17 that covers moisture in the atmosphere so as to pass toward the sealing layer 10. The covering layer 17 is provided only on the surface opposite to the surface in contact with the sealing portion of the sealing layer 10. In this embodiment, the coating layer 17 is a cured silicone rubber layer. The thickness of the cured silicone rubber layer is preferably 1 to 1000 μm, more preferably 2 to 500 μm. The covering layer 17 is preferably thinner than the sealing layer 10.

  On the other hand, the surface of the sealing layer 10 opposite to the coating layer 17 (the surface in contact with the sealing portion) is covered with a film 11 b that is one of the film bases 11. The user of the sealing material 1c peels off the film 11b, affixes the exposed surface of the sealing layer 10 to the sealing portion, and after the sealing layer 10 is cured, the coating layer 17 is left as it is without being peeled off from the sealing layer 10. it can. Since the coating layer 17 is formed of a cured silicone rubber, the air permeability of the seal layer 10 can be ensured. For this reason, the coating layer 17 does not cause a great hindrance to the curing of the seal layer 10.

  In this embodiment, the covering layer 17 is a cured silicone rubber, that is, a layer of cured silicone rubber. If the coating layer 17 is a silicone rubber layer having a siloxane bond as a main skeleton, it is obtained by using the above-mentioned condensation reaction type self-adhesive silicone rubber (composition containing a curable organopolysiloxane curable by condensation reaction). Or obtained using a composition containing a curable organopolysiloxane curable by addition reaction.

  Further, like the sealing material 1c ′ shown in (4C), a cured silicone rubber layer 17a (= covering layer 17a) having a plurality of through holes 13 communicating in the thickness direction is provided in place of the covering layer 17. Also good.

(Fifth embodiment)
Next, a silicone-based sealing material according to a fifth embodiment of the present invention will be described. In the fifth embodiment, components that are the same as those in each of the above-described embodiments are assigned the same reference numerals, and redundant descriptions are omitted.

  FIG. 5: shows the perspective view of the silicone type sealing material which concerns on 5th Embodiment, and the enlarged view of the part C. FIG.

  The silicone-based sealing material according to the fifth embodiment (referred to as “sealing material” as in the above-described embodiments) 1d has a spirally wound form and does not include a film base material. This is because the sealing surface of the sealing layer 10 is stored in a state where it is in contact with the coating layer 17 of the sealing material 1d itself, so that there is a low possibility that moisture in the atmosphere will come into contact with the sealing layer 10. However, the sealing material 1d is preferably sealed so as not to be exposed to the atmosphere until use.

  The sealing material 1d is longer than the sealing material 1c according to the fourth embodiment, but is common in that it includes a cured silicone rubber layer as the coating layer 17. The sealing material 1d may include a coating layer 11a instead of the coating layer 17.

(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, when the coating layers 11a, 17, and 17a include the through-holes 13 that penetrate in the thickness direction, the through-holes 13 are not limited to the tubular holes arranged along the thickness direction, and are porous. It may be a gap formed by existing holes which are coupled to each other. The through-hole area | region 15 with which the coating layer 11a of the sealing material 1a is equipped may be formed in the film 11b side of the sealing material 1a. In that case, the film 11b becomes a layer of the same form as the coating layer 11a in the sealing material 1a. The film 11b of the sealing material 1a may have the through holes 13 distributed over the entire surface. In that case, the film 11b of the sealing material 1a becomes a layer having the same form as the coating layer 11a of the sealing material 1b.

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

1, 1 a, 1 b, 1 c, 1 c ′, 1 d... Silicone sealing material, 10... Sealing layer, 11... Film base, 11 a. 11b ... film (one of film base materials), 13 ... through-hole, 15 ... through-hole region, 16 ... non-through-hole region, 17, 17a ... coating layer.

Claims (5)

A sealing layer made of self-adhesive silicone rubber;
A coating layer that covers the sealing layer and covers the sealing layer so that moisture in the atmosphere can pass through;
With
A silicone-based sealing material comprising the covering layer at least on a surface opposite to a surface where the sealing layer is in contact with a sealing portion. The coating layer is a film substrate that is peeled after the sealing layer is cured,
The silicone-based sealing material according to claim 1, wherein the film base material is a porous film base material provided with a plurality of through-holes communicating in the thickness direction.   The porous film substrate includes a through-hole region having the through-hole on at least a surface in contact with the seal layer, and a non-through-hole region other than the through-hole region and not having the through-hole. The silicone-type sealing material of Claim 2 provided. The coating layer is provided only on the surface opposite to the surface in contact with the sealing portion of the sealing layer,
The silicone-based sealing material according to claim 1, wherein the coating layer is a cured silicone rubber layer.   The silicone-based sealing material according to claim 4, wherein the cured silicone rubber layer is provided with a plurality of through holes penetrating in the thickness direction.