JP2000136576A - Sealant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealant of a fixed form excellent in the property of being installed in a gap while varying little in its installed condition to keep its installed condition stable, and requiring no solidifying process so that the efficiency of construction is excellent and the period of construction work can be reduced, thus maintaining high sealing performance with excellent reliability over a long period. SOLUTION: A sealant has pressure-sensitive adhesive layers 2, 3 on the outside of a supporting base 1 curved in the form of a wedge and has a compression restorable foam layer 4 inside the supporting base, the foam layer 4 having a cross-sectional shape matching the wedge shape of the supporting base. Thus, the sealant can easily be installed even in a small gap by compressing the foam layer 4 and using the end of the wedge shape as a guide. After installation, the foam layer is restored from its compressed condition and the sealant adheres well to the gap via the pressure- sensitive adhesive layers on the outside of the base and keeps its installed condition stable by following even the deformation of the gap after installation. The use of the non-tacking pressure-sensitive adhesive layers enables a good sliding property to be achieved, and the assembly and connection of a cover and a sealing process can be achieved at the same time by mounting the sealant at the end of a cover material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a racking cover such as a water seal for various gaps and an exhaust duct, which can be easily compression-mounted in a gap or the like, maintains the mounted state stably, and maintains a high sealing performance for a long period of time. The present invention relates to a fixed-shaped sealing material suitable for a sealing process which also serves as a connection between both side ends in the above.

[0002]

2. Description of the Related Art Conventionally, as a sealing material for waterproofing and windproofing of various gaps such as a gap between an outer wall and an interior part / inner wall, a putty-like material filled with a caulking gun or a spatula is used. Shaped fluids were known. Such a fluid sealing material such as a caulking agent is generally solidified by drying and curing after filling. Therefore, for example, in the work of mounting a racking cover such as an exhaust duct, after assembling and connecting both ends of the cover wound around the duct, a caulking agent is flow-loaded into the connection portion to fill the gap, and a water seal or the like is used. Has been done to achieve

[0003] However, in the case of a fluid sealing material, the filling operation is apt to vary, the sagging is apt to occur before solidification due to drying and curing after the filling, and the reliability of the sealing process is poor, and it takes time to solidify. There was a problem that the construction period was lengthened. On the other hand, a fixed-type sealing material such as a string for fixing a net such as a screen door to a door frame is also known, but the pressing force tends to vary due to press-fitting into a gap due to elasticity and the like, so that the sealing is difficult. There is a problem that the defective portion is easily generated and the reliability of the sealing process is poor.

[0004]

The present invention has excellent workability in mounting to a gap, has little variation in the working state, maintains the mounting state stably, does not require solidification treatment, is excellent in working efficiency, and has a short construction period. The task is to develop a fixed-type sealing material that can be shortened and maintain high sealing performance with excellent reliability over a long period of time.

[0005]

According to the present invention, there is provided a compression base having a pressure-sensitive adhesive layer outside a support substrate bent into a wedge shape, and a cross-sectional shape corresponding to the wedge shape of the support substrate inside the support substrate. An object of the present invention is to provide a sealing material having a resilience foam layer.

[0006]

According to the present invention, the foamed layer can be easily compressed into the narrow gap by guiding the wedge-shaped tip portion without flow or expansion and contraction, and the compression of the foamed layer is restored after loading. As a result, it is possible to obtain a fixed-type sealing material which adheres well between the gaps via the pressure-sensitive adhesive layer outside the base material, and follows the deformation of the gap after mounting to stably maintain the mounted state.
Therefore, it has excellent workability in mounting to gaps, and achieves high reliability sealing process that maintains high sealing performance for a long period of time through close contact through the pressure-sensitive adhesive layer inside and outside of the base material in a short period of time. It can be easily applied to wide gaps.

[0007] In particular, in the above, in the pressure-sensitive adhesive layer using the polymer having the above-mentioned polycarbonate structure, it exhibits good slip properties due to non-tack properties, and can be particularly easily loaded into the gap. Good adhesion due to pressure-sensitive adhesiveness via restoring force, and exhibits high sealing force.

[0008] On the other hand, upon application, it can be used by being previously bonded to a sheet or the like via a pressure-sensitive adhesive layer provided on a sealing material. According to this, for example, at the time of attaching a racking cover such as an exhaust duct, a sealing material is bonded to the end of the cover material in advance and wound around the duct, and at the time of winding, the cover end is assembled via the attached sealing material. It is also possible to connect and achieve connection and sealing at the same time. Therefore, in this case, it is possible to omit a sealing process using a caulking agent or the like after the cover end is assembled and connected.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A sealing material according to the present invention has a pressure-sensitive adhesive layer outside a support substrate bent into a wedge shape, and a cross-sectional shape corresponding to the wedge shape of the support substrate inside the support substrate. The foamed layer has a compression-recoverable foamed layer having the following. If necessary, the foamed layer is in close contact with the support substrate through an adhesive layer. An example is shown in FIG. 1 is a supporting substrate, 2 and 3 are pressure-sensitive adhesive layers, 4 is a foamed layer,
6 is an adhesive layer as required.

The supporting base material supports the attached pressure-sensitive adhesive layer or foam layer, and forms a seal wall in close contact with the gap through the pressure-sensitive adhesive layer, thereby facilitating loading into the gap. For this purpose, a wedge-shaped one is used. Therefore, as the supporting base material, an appropriate material that allows the restoration of the compressed foamed layer, can be bent as necessary, and can withstand the intended sealing treatment such as waterproofing, windproofing, chemical-proofing liquid, insect-proofing, or the like can be used.

In general, for example, a metal thin plate, a plastic sheet, or a composite thin plate such as a laminate using the same is used. Among them, for example, a corrosion-resistant metal sheet such as stainless steel, an ester polymer such as PET or a styrene polymer such as polystyrene, an acrylic polymer such as polyacrylic acid, a sulfone polymer such as polysulfone, and a polyvinyl chloride such as polyvinyl chloride A plastic sheet or the like that does not easily break even in a thin layer of a vinyl polymer or the like is preferably used.

The bent form of the wedge-shaped support substrate is represented by a Λ-shape due to an acute bend as shown in the figure, but the present invention is not limited to such a 形 -shape. Any form that can be used as a unit may be used. Therefore, an appropriate shape such as a shape having a rounded end portion such as an Ω-shape may be used, and the lengths of the right and left sides via the bent portion may be different. This can be preferably used when there is a step on the left and right sides of the gap.

[0013] The thickness of the supporting base material is set to about 1/2 or less of the gap width for the purpose of mounting in order to enable the mounting in the gap and the pressure contact through the elasticity of the foam layer. 1 /
5 or less, especially 1/10 or less, especially 1/20 or less. The typical thickness of the supporting base material in consideration of the sealing performance and the resistance such as strength is 10 μm to 3 mm, particularly 20 μm to 1 mm.
Particularly, it is 50 to 500 μm, but is not limited to this.

The formation of the wedge-shaped support substrate can be performed by an appropriate method such as a method of forming into a predetermined wedge shape by bending or extrusion. Even for a supporting base material that is liable to generate cracks, breaks, and the like in the bending process, generation of cracks, breaks, and the like can be prevented by bending the substrate under heating.

Pressure-sensitive adhesive layers 2 and 3 are provided outside the right and left sides of the supporting base material via the bent portions, as shown in FIG. To form the pressure-sensitive adhesive layer,
For example, a suitable pressure-sensitive adhesive such as rubber, acrylic, vinyl alkyl ether, silicone, or polyamide can be used. Particularly, a material having a weak tackiness, particularly a non-tackiness material showing no tackiness, can be preferably used from the viewpoint of preventing adhesion of the sealing material to the gap wall due to tacking when the sealing material is loaded into the gap.

Incidentally, the non-tack pressure-sensitive adhesive layer is represented by, for example, -OROC (O)-(where R is a linear or branched hydrocarbon group having 2 to 20 carbon atoms). It can be formed of a pressure-sensitive adhesive composition containing a polymer having a polycarbonate structure having a repeating unit. That is, such a pressure-sensitive adhesive composition exhibits non-tackiness by containing a polymer having a polycarbonate structure having the repeating unit, and does not exhibit tackiness due to tack, but exhibits adhesive force when left in a pressed state, and exhibits a sense of adhesion. It shows pressure bonding.

From the viewpoint of non-tackiness and pressure-sensitive adhesiveness, the preferred polymers have a weight average molecular weight of 10,000 or more, more preferably 30,000 or more, and especially 50,000 to 300,000. The number of repetitions n of the unit is not particularly limited. Therefore, n is 1, that is, a unit having a repeating unit represented by -OROC (O)-separated from the unit, or n is 2 or more, and the repeating unit is continuously or partially continuous. Or a polymer having an appropriate repeating structure such as a compound having a repeating structure thereof.

Incidentally, specific examples of the polymer include:
Polyesters comprising a polycarbonate diol or a derivative thereof and a dicarboxylic acid; polyesters comprising a polycarbonate dicarboxylic acid and a diol; polyurethanes comprising a polycarbonate diol or a derivative thereof and a diisocyanate; and one or more of these may be used. .

In the above, a polyester comprising a polycarbonate diol and a dicarboxylic acid can be particularly preferably used from the viewpoint of non-tackiness and pressure-sensitive adhesiveness. Such a polyester can be prepared, for example, by a method in which a polycarbonate diol and another diol component as necessary are subjected to an esterification reaction with a dicarboxylic acid in the absence of a catalyst or in the presence of a catalyst.

The above polycarbonate diol is represented by the following formula: (However, R is a linear or branched hydrocarbon group having 2 to 20 carbon atoms.) A diol having a repeating unit represented by the following formula, in particular, a number average molecular weight of 400 or more, particularly 600 or more, particularly One or more of 900 to 10,000 can be preferably used from the viewpoint of the above-described characteristics and the like. Specific examples thereof include polyhexamethylene carbonate diol, poly (3-methylpentene carbonate) diol, polypropylene carbonate diol, a mixture and a copolymer thereof, and the like.
CD208PL, CD210PL, CD220P
L, CD205HL, CD208HL, CD21
There are also commercially available products such as 0HL and CD220HL (all manufactured by Daicel Chemical Industries, Ltd.).

On the other hand, other diol components used as required include linear or branched diols such as ethylene glycol, propylene glycol, butanediol, hexanediol, octanediol, decanediol and octadecanediol. One or more kinds may be mentioned. The use amount of the diol component other than the polycarbonate diol is preferably 50% by weight or less, more preferably 40% by weight or less, and particularly preferably 30% by weight or less of the total diol component. In preparing the polymer, a small amount of a polyol having three or more functional groups can be added for the purpose of increasing the molecular weight.

On the other hand, as the above-mentioned dicarboxylic acids, one or two or more kinds of aliphatic or alicyclic compounds having a molecular skeleton of a linear or branched hydrocarbon group having 2 to 20 carbon atoms are used. sell. Specific examples thereof include succinic acid and methylsuccinic acid, adipic acid and pimelic acid, azelaic acid and sebacic acid, 1,12-dodecanoic acid and 1,14-tetradecanoic acid, tetrahydrophthalic acid and endmethylenetetrahydrophthalic acid, and the like. Examples include acid anhydrides and lower alkyl esters.

The pressure-sensitive adhesive composition is usually used because it is preferable to form a pressure-sensitive adhesive layer obtained by crosslinking a polymer having a polycarbonate structure contained therein from the viewpoint of durability such as heat resistance and non-tack property. It is prepared so that the polymer can be crosslinked. The crosslinking method is not particularly limited, and an appropriate method according to the conventional pressure-sensitive adhesive crosslinking method can be employed.

In general, a method of adding a crosslinking agent and performing a crosslinking treatment via a functional group such as a hydroxyl group or a carboxyl group contained in the polymer is employed. Examples of the crosslinking agent include a conventional pressure-sensitive adhesive having a functional group capable of reacting with a functional group contained in the polymer, such as a polyisocyanate type, an epoxy type, an aziridine type, a metal chelate type, and a metal alkoxide type. An appropriate compound according to the crosslinking agent can be used. Above all, a polyisocyanate-based compound can be preferably used from the viewpoint of crosslinkability.

Incidentally, specific examples of the above-mentioned polyisocyanate compounds include lower aliphatic polyisocyanates such as ethylene diisocyanate, butylene diisocyanate and hexamethylene diisocyanate, and alicyclic rings such as cyclopentylene diisocyanate, cyclohexylene diisocyanate and isophorone diisocyanate. Formula type polyisocyanates, 2,4-tolylene diisocyanate and 4,4′-diphenylmethane diisocyanate,
Examples include aromatic polyisocyanates such as xylylene diisocyanate, tolylene diisocyanate adduct of trimethylolpropane, and hexamethylene diisocyanate adduct.

One or more cross-linking agents can be used in the same manner as the other components. The amount of the cross-linking agent to be used is appropriately determined according to the pressure-sensitive adhesive properties such as the non-tack property and the purpose of use of the sealing material. be able to. In general, 10 parts by weight or less, preferably 0.1 to 8 parts by weight, especially 0.5 to 5 parts by weight, per 100 parts by weight of the polymer having a polycarbonate structure, from the viewpoint of non-tackiness and adhesiveness after mounting. And the amount used.

The pressure-sensitive adhesive composition can be prepared, for example, by a method in which the components are mixed by a suitable method via a solvent or a dispersion medium as required. Upon its preparation, if necessary, for example, a tackifier, an antioxidant, an inorganic or organic filler or pigment, a powder such as metal powder, and a pressure-sensitive adhesive such as a granule or a foil-like material are added. One or more suitable additives that may be present may be blended.
In particular, the combination of a tackifier and an antioxidant may be effective in adjusting the balance between adhesion and durability and improving durability.

As described above, it is preferable to provide a pressure-sensitive adhesive layer such as a non-tack property on the outside of the support substrate, that is, on the side that comes into contact with the gap wall. The pressure-sensitive adhesive layers (2, 3) do not need to be the same on the left and right sides, and different layers may be provided. The combination of the pressure-sensitive adhesive layers in different cases can be determined as appropriate, such as a combination of different types of non-tack pressure-sensitive adhesive layers, a combination of one non-tack pressure-sensitive adhesive layer and the other a tack-sensitive pressure-sensitive adhesive layer. it can.

The attachment of the pressure-sensitive adhesive layer to the support substrate may be performed, for example, by applying a pressure-sensitive adhesive in the form of a solution or the like on the support substrate, or by applying a pressure-sensitive adhesive on a separator in the same manner as described above. It can be carried out by an appropriate method such as a method of transferring onto a supporting substrate. The thickness of the pressure-sensitive adhesive layer can be appropriately determined according to the adhesive force and the like, and is generally 1 to 500 μm, preferably 5 to 30 μm.
The thickness is set to 0 μm, particularly 10 to 100 μm, but is not limited thereto, and may be 1 mm or more. When the pressure-sensitive adhesive layer is exposed on the supporting base material, it is preferable to temporarily protect the surface with a separator or the like to prevent contamination or the like until the sealing material is put to practical use.

As shown in the figure, a compression-restorable foam layer 4 having a cross-sectional shape corresponding to the wedge is provided inside the wedge-shaped support substrate 1. This foamed layer compresses it, loads the sealant into the gap, restores the compressed state, expands the wedge-shaped support base with the restoring force, and provides the support base on the outside with the pressing force. The pressure-sensitive adhesive layers 2 and 3 are used to press against the gap wall via the pressure-sensitive adhesive layers 2 and 3, and a high-level sealing process is achieved by the action of the foam layer.

Therefore, in forming the foamed layer, an appropriate foam having compression restoring property can be used. In particular, an easily compressible foam is preferable from the viewpoint of workability of loading into the gap. Incidentally, examples of the foam include ethylene-propylene copolymer and ethylene-propylene-diene copolymer (EPD).
M), rubber-based foams such as polyethylene, polyolefin-based foams, urethane-based foams, silicone-based foams, polyvinyl chloride-based foams, acrylic foams, natural rubbers and butyl rubbers, and various rubbers such as SBR, NR, NBR, and chloroprene rubber. Foams, foams made of blends of these polymers, and the like are included.

For such a foam, for example, a polymer is mixed with a necessary component such as a foaming agent, a filler, a crosslinking agent or a vulcanizing agent by a Banbury mixer or a pressure kneader, and the mixture is calendered or extruded. Formed into an appropriate cross-sectional form such as a sheet or rod shape by a conveyor belt casting method, etc., and heat-treated to obtain a foam. Can be formed by an appropriate method such as a method of obtaining

The foaming state of the foam can be appropriately determined depending on the workability of compression loading, the compression restoring property, the restoring force, the ability to maintain the function with respect to the external environment, and the like. 0.01 to 0.5, especially 0.
02 to 0.3, particularly 0.05 to 0.2. The foam used may be either a closed-cell structure or an open-cell structure. It preferably has a mixed structure.

The foam layer is arranged in a cross-sectional shape corresponding to the wedge shape of the supporting substrate. This is intended to prevent the difficulty in loading the sealing material into the gap by compressing the foamed layer due to the wedge-shaped collapse or deformation of the supporting base material. Therefore,
The cross-sectional shape of the foam layer in which the wedge shape of the supporting base material is deformed to such an extent that the gap can be charged is acceptable. The cross-sectional shape of the foam layer can be determined by an appropriate method such as a method of giving a predetermined shape at the time of manufacturing the foam, or a method of cutting and laminating the foam to form the foam.

The thickness of the foamed layer can be appropriately determined according to the gap, compressibility, resilience, etc. of the object to be applied. In general, the thickness of the foamed layer is twice the thickness of the supporting substrate and the pressure-sensitive adhesive layer outside the substrate. Of the total thickness of the foamed layer and the maximum thickness of the foamed layer, the thickness is 1.05 times or more, preferably 1.1 times or more, particularly 1.5 times or more of the gap to be applied.

The foamed layer may be provided continuously inside the support substrate, or may be provided partially at regular intervals. The foam layer is preferably provided in close contact with the support substrate 1 via the adhesive layers 5 and 6 as shown in the figure, from the viewpoint of the workability of compressing and loading the sealing material and the long-term stable holding of the foam layer. The adhesive layer can be formed with an appropriate adhesive, but a pressure-sensitive adhesive having the above-mentioned tack can be preferably used from the viewpoint of adhesion workability and the like.

The sealing material according to the present invention may have various dimensions such as a gap between an outer wall of a building and a gap between an interior part such as a vanity table and an inner wall with an appropriate size such as a fixed size body or a long body. It can be preferably used for the purpose of various sealing treatments such as waterproofing, windproofing, soundproofing, and insectproofing in the gap. Further, for example, it can be preferably used for sealing processing of a connection portion of a racking cover such as an exhaust duct.

In the case of assembling the cover as described above, for example, as shown in FIG. 2, it is previously bonded to a cover sheet 8 or the like via a pressure-sensitive adhesive layer provided on the sealing material 7, and the sheet is wound around a duct or the like. The connection process and the sealing process can be achieved at the same time by using a method of connecting to the assembling section 81 via a sealing material attached to the sheet.

[0039]

Example 1 A polyester-based pressure-sensitive adhesive containing a polymer having the above-mentioned polycarbonate structure was coated on one side of a PET film having a thickness of 100 μm, and a non-tack pressure-sensitive adhesive layer having a thickness of 30 μm was provided. The pressure-sensitive adhesive layer is bent into a wedge shape so that it is on the outside, and E5 having a specific gravity of 0.15 is formed inside.
A foam layer (maximum thickness 8 mm) having a trapezoidal cross section corresponding to the wedge shape and having a mixed structure of closed cells and open cells made of a PDM foam is bonded and fixed via an acrylic pressure-sensitive adhesive layer having a thickness of 20 μm, A sealing material was obtained.

Example 2 A sealing material was obtained in the same manner as in Example 1 except that the foam layer was replaced with a closed cell structure.

Example 3 A sealing material was obtained in the same manner as in Example 1 except that the pressure-sensitive adhesive layer on one side on the right and left sides through the bent portion was replaced with an acrylic pressure-sensitive adhesive layer.

Comparative Example A commercially available putty-like caulking agent was used as a sealing material.

Evaluation Test Workability, Variation, Water Sealability The sealing material obtained in each of Examples and Comparative Examples was applied to a width 5 mm between outer wall panels.
The foam layer was mounted on the joint of mm by compression loading, and the workability (workability, variation) at that time was examined. Further, a wall was provided in a water-tight manner with respect to the seal portion, water was poured, and the water sealability at a hydrostatic pressure of 100 mm was examined. The above-mentioned variation means variation in the construction state by different workers.

A connection material is attached to the other end of the metal cover having a mounting receiving portion formed at one end, and the sealing material is mounted on the mounting receiving portion to perform the mounting work and the sealing process. The sex was examined.

The results are shown in the following table. * 1: It took a long time to dry

From the table, it can be seen that the sealing material of the embodiment can stably and efficiently perform sealing with a small work period and little variation by the operator, and can simultaneously achieve the assembling connection and the sealing process by bonding to the sheet edge or the like.

[Brief description of the drawings]

FIG. 1 is an explanatory sectional view of an embodiment.

FIG. 2 is an explanatory sectional view of an application example.

[Explanation of symbols]

 1: Support substrate 2, 3: Pressure-sensitive adhesive layer 4: Foam layer 5, 6: Adhesive layer

Claims (3)

[Claims] 1. A compression-recoverable foam layer having a pressure-sensitive adhesive layer outside a support base bent into a wedge shape, and a cross-sectional shape corresponding to the wedge shape of the support base inside the support base. A sealing material comprising: 2. The method according to claim 1, wherein one or both of the pressure-sensitive adhesive layers outside the support base on the left and right sides through the bent portion of the support base are -OROC (O)-(where R is carbon. It is a linear or branched hydrocarbon group having 2 to 20 numbers.)
A sealing material comprising a pressure-sensitive adhesive composition containing a polymer having a polycarbonate structure having a repeating unit represented by the following formula: 3. The sealing material according to claim 1, wherein the foamed layer has a closed cell structure or a mixed structure of closed cells and open cells, and is in close contact with the supporting substrate via an adhesive layer.