JP2002294188A - Pressure-sensitive adhesive tape and method for enhancing airtightness of opening - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prepare a pressure-sensitive adhesive tape which exhibits an excellent airtightness when used, e.g. around an opening of a building; and to provide a method for using the same. SOLUTION: The pressure-sensitive adhesive tape is prepared by forming an acrylic pressure-sensitive adhesive layer 4 mainly comprising an acrylic copolymer prepared by the copolymerization of 5-60 wt.% alkyl (meth)acrylate having a 9-18C alkyl group and 40-95 wt.% alkyl (meth)acrylate having a 2-8C alkyl group on a substrate film 3 mainly comprising a metal foil 1. Preferably, the metal foil 1 has a thickness of 20-200 μm. The pressure-sensitive adhesive tape is used around an opening of a building to enhance the airtightness of the opening.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adhesive tape and a method for using an adhesive tape, and more particularly, to an adhesive tape suitably used as an airtight member for an opening of a house or the like, and an opening using the adhesive tape. To improve the airtightness of the part.

[0002]

2. Description of the Related Art In recent years, from the viewpoint of energy saving, high heat insulation and high airtightness are desired in order to increase heating and cooling efficiency from the viewpoint of energy saving. What needs to be airtight is the outer skin of the building. In the case of a two-story house, the floor on the first floor, the outer wall, and the ceiling on the second floor. In particular, airtightness around openings such as windows on the outer wall is important, but it has been difficult to achieve sufficient airtightness conventionally because of the complicated accommodation. The usual method of airtightness was to use a moisture-proof sheet or an adhesive tape. Conventional adhesive tapes are described in "Architectural Knowledge" [March 1999
January 1: Architectural Knowledge Co., Ltd .: Issued March issue, p. 140] is a gum tape or a butyl rubber-based adhesive tape, and a butyl rubber tape is considered to be preferable.

[0003]

However, according to the study of the present inventor, the portion to be hermetically sealed with the adhesive tape is made of a material having a different coefficient of linear expansion such as an aluminum sash, a plastic sash, or wood. Therefore, due to the effects of the respective thermal expansions and contractions, the adhesive tape suffers from repeated fatigue and has a problem that the temperature becomes high in summer. Therefore, the conventional butyl rubber-based pressure-sensitive adhesive has flexibility but insufficient elongation, and peels off when repeatedly subjected to fatigue such as thermal expansion and contraction, and in summer, peels off due to poor heat resistance. There was a problem. Furthermore, since the base material of the adhesive tape is a cloth or a plastic film or cloth, it is difficult to apply the adhesive tape to a complicated shape such as an outside corner or an inside corner, and a gap is formed.
In the end, wrinkles were generated and airtightness could not be sufficiently secured.

An object of the present invention is to solve the above-mentioned problems of the conventional adhesive tape for hermetic sealing, to provide excellent fatigue strength and heat resistance against repetition of thermal expansion and contraction and the like, as well as to improve corners and corners. Adhesive tape that is easy to attach to complex shapes and exhibits excellent airtightness when used around openings in houses and the like, and airtightness in openings in buildings using this adhesive tape The purpose is to provide a way to increase the quality.

[0005]

The adhesive tape according to claim 1 is provided.
The alkyl (meth) acrylate having an alkyl group having 9 to 18 carbon atoms in an amount of 5 to 60% by weight;
(Meth) acrylates having an alkyl group
An acrylic pressure-sensitive adhesive mainly composed of an acrylic copolymer obtained by copolymerizing 0 to 95% by weight is laminated on a base film mainly composed of a metal foil.

The pressure-sensitive adhesive tape according to claim 2 is the pressure-sensitive adhesive tape according to claim 1, wherein the metal foil has a thickness of 20 to 200.
μm. According to a third aspect of the present invention, there is provided a method for improving the airtightness of an opening, wherein the adhesive tape according to the first aspect is used around an opening of a building.

The details of the present invention will be described below. The acrylic pressure-sensitive adhesive used in the present invention comprises 5 to 60% by weight of an alkyl (meth) acrylate having an alkyl group having 9 to 18 carbon atoms and 2 carbon atoms in an acrylic copolymer.
(Meth) acryle having an alkyl group of from 8 to 8
An acrylic pressure-sensitive adhesive mainly composed of an acrylic copolymer obtained by copolymerizing 40 to 95% by weight.

The alkyl (meth) acrylate having an alkyl group having 9 to 18 carbon atoms is out of the range of 5 to 60% by weight, or the alkyl (meth) acrylate having an alkyl group having 2 to 8 carbon atoms is 40% by weight. If the content is out of the range of 95% by weight, problems such as insufficient elongation properties and heat resistance may occur.

More preferred acrylic copolymers are alkyl (meth) acrylates having an alkyl group having 9 to 18 carbon atoms, 5 to 40 parts by weight, and alkyl (meth) acrylates having 2 to 8 carbon atoms. -60 to 95% by weight of the copolymer is copolymerized.

Examples of the alkyl (meth) acrylate having an alkyl group having 9 to 18 carbon atoms include, for example, lauryl (meth) acrylate, myristyl (meth) acrylate, and isomiristyl (meth) acrylate. , Isononyl (meth) acrylate, decyl (meth) acrylate, palmityl (meth) acrylate, stearyl (meth) acrylate, etc., and these can be used alone or in combination of two or more. it can.

The alkyl (meth) acrylate having an alkyl group having 2 to 8 carbon atoms includes, for example, ethyl (meth) acrylate, isopropyl (meth) acrylate, and n-propyl (meth) acrylate. , N-butyl (meth) acrylate, cyclohexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate,
Isooctyl (meth) acrylate, n-octyl (meth) acrylate and the like can be mentioned, and these can be used alone or in combination of two or more.

The acrylic copolymer may be one obtained by copolymerizing another modified vinyl monomer, if necessary. Alternatively, in order to increase the adhesiveness to polyolefin,
An olefin polymer having a polymerizable unsaturated double bond at the terminal may be copolymerized. The acrylic copolymer may be a mixture of a tackifier, a chain transfer agent, and the like, if necessary, or may be a mixture of various additives.

The modified vinyl monomer is not particularly limited. For example, a carboxyl group-containing monomer such as acrylic acid, maleic acid, fumaric acid, and itaconic acid or an anhydride thereof for the purpose of improving cohesion, or Nitrogen-containing monomers such as acrylonitrile, N-vinylpyrrolidone, N-vinylcaprolactam, acrylylmorpholine, (meth) acrylamide, dimethylaminoethyl acrylate, and dimethylaminopropyl acrylamide.
-Hydroxyethyl (meth) acrylate, 2-hydroxybutyl acrylate, modified caprolactone (meth)
Acrylate, polyoxyethylene (meth) acrylate
And monomers having a hydroxyl group such as polyoxypropylene (meth) acrylate.

As the olefin polymer having a polymerizable unsaturated double bond at the terminal, a polymer having a polymer structure comprising a double bond copolymerizable with another vinyl monomer and an olefin skeleton at the terminal is particularly preferable. Without being limited, examples of the olefin skeleton include ethylene-
Examples include a butylene random copolymer and an ethylene-propylene copolymer.

Examples of the tackifying resin include conventionally known rosin resins, modified rosin resins, terpene resins, terpene phenol resins, C5 and C9 petroleum resins, cumarone resins, and hydrogenated products thereof. And, if necessary, used alone or in combination of two or more. Examples of the chain transfer agent include conventionally known n-dodecanethiol, benzene, cyclohexane, toluene, ethylbenzene, isopropylbenzene, carbon tetrachloride and the like, and if necessary, used alone or in combination of two or more.
Other additives are not particularly limited, and include conventionally known plasticizers, softeners, inorganic fillers, organic fillers, pigments, dyes, calcium carbonate, silica, talc, and the like.

The acrylic copolymer may be a solvent type polymerized in a solvent or an emulsion type polymerized in water. The above-mentioned acrylic copolymer is preferably crosslinked, in that it increases fatigue strength and heat resistance, and in terms of preventing the sticking of the pressure-sensitive adhesive on the side of the tape, and the like, and as the crosslinking method, any conventionally known method can be used. Often, isocyanate cross-linking, epoxy cross-linking, aziridine cross-linking and the like can be mentioned. Further, a mixture obtained by irradiating a mixture of acrylic monomers with ultraviolet rays and performing bulk polymerization may be used.

When the acrylic copolymer is obtained by UV bulk polymerization, a monomer having two or more copolymerizable unsaturated double bonds in the molecule is required to form a crosslinked product.
May be blended and copolymerized as a crosslinking agent, for example, hexanediol-di (meth) acrylic acid.
G, (poly) ethylene glycol di (meth) acrylate
, (Poly) propylene glycol di (meth) acrylate, neopentyl glycol di (meth) acrylate
Pentaerythritol di (meth) acrylate, pentaerythritol tri (meth) acrylate, trimethylolpropane trimethacrylate, allyl (meth) acrylate, vinyl (meth) acrylate, Divinylbenzene and other epoxy acrylates, polyester acrylates, urethane acrylates and the like are preferably used.

The acrylic copolymer is usually polymerized by a solution polymerization system, a bulk polymerization system, an emulsion polymerization system, a pearl polymerization system, or the like. However, the bulk polymerization system is advantageous in that a uniform polymer can be easily obtained. In this case, a photopolymerization method using ultraviolet rays is preferable, and in this case, a photoinitiator is used.

As the photopolymerization initiator, for example, 4- (2
-Hydroxyethoxy) phenyl (2-hydroxy-2
-Propyl) ketone [Darocure-2959: manufactured by Merck]; α-hydroxy-α, α'-dimethyl-acetophenone [Darocure 1173: manufactured by Merck]; methoxyacetophenone, 2,2-dimethoxy-2-phenylacetophenone [Irgacure] No. 651: Ciba-Geigy Co., Ltd.], acetophenones such as 2-hydroxy-2-cyclohexylacetophenone [Irgacure 184: Ciba-Geigy Co.], and benzyl dimethyl ketal and other digits.
And halogenated ketones, acylphosphinoxides, acylphosphonates and the like.

In the pressure-sensitive adhesive tape of the present invention, the thickness of the acrylic pressure-sensitive adhesive laminated on the base film is as follows:
Although not particularly limited, in terms of adhesion to wood such as pillars,
It is preferably at least 0.2 mm, more preferably from 0.5 to 2.0 mm.

The substrate film used in the present invention is not particularly limited as long as it is mainly composed of a metal foil.
One using a metal foil as a base film as a base film, or one obtained by laminating a thermoplastic resin film such as polyester, polyethylene, polypropylene, or polycarbonate on one or both sides of a metal foil Is preferably used. Here, “mainly composed of a metal foil” means that the thickness of the metal foil is 50% or more of the thickness of the entire base film.

As the above-mentioned metal foil, conventionally known ones are widely used, for example, aluminum foil, iron foil, stainless steel foil,
Copper foil, tin foil, lead foil and the like are mentioned, and the thickness is usually 2
It is 0 to 200 μm, preferably 30 to 100 μm. As a film to be laminated on the metal foil,
There is no particular limitation, and for example, thermoplastic films such as polyester, polyethylene, polypropylene, and polycarbonate are preferably used. The thickness of the thermoplastic film to be laminated is not particularly limited, but in terms of reducing the rebound when the tape is bent, 10
~ 50 µm is preferred. The thermoplastic film is provided for reinforcement such as prevention of tearing or tearing of the metal foil alone.

The method for laminating the acrylic pressure-sensitive adhesive on the substrate film in the present invention is not particularly limited. For example, a solution-type or emulsion-type acrylic pressure-sensitive adhesive previously polymerized is directly applied on the substrate film. And a method of applying each of the mixed monomers onto the base film and then photopolymerizing with ultraviolet rays. Further, a method of preparing an acrylic pressure-sensitive adhesive in advance on a release paper subjected to a release treatment by using the same method as described above, and then laminating the acrylic pressure-sensitive adhesive with a base film can be used.

The shape of the pressure-sensitive adhesive tape of the present invention can be generally obtained by subjecting a surface of the substrate film on which the acrylic pressure-sensitive adhesive is not laminated to a release treatment and rolling up the film, Rolled or rolled sheets with release paper attached are selected as necessary. The method of increasing the airtightness of the opening of the present invention, as described below, the adhesive tape of the present invention, around the opening of a building such as a house, the gap of the opening, usually from the indoor side, in some cases It is used to close from the outside of the room.

(Advantage) In the pressure-sensitive adhesive tape of the present invention, since the base film is mainly made of metal foil, it follows a complicated shape such as an outside corner or an inside corner of an opening of a house or the like by plastic deformation of the metal foil. In addition to being able to be easily adhered, residual stress such as tension hardly occurs after the adhesion, and the fatigue strength due to thermal expansion and contraction is improved. Further, the acrylic pressure-sensitive adhesive comprises 5 to 60% by weight of an alkyl (meth) acrylate having an alkyl group having 9 to 18 carbon atoms, and 2 to 2 carbon atoms.
(Meth) acryle having an alkyl group of from 8 to 8
Since the main component is an acrylic copolymer obtained by copolymerizing 40 to 95% by weight of the adhesive, the adhesive has excellent elongation characteristics and heat resistance, so that it does not peel off even during repeated fatigue. Excellent adhesive strength can be maintained even at high temperatures.

[0026]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic sectional view showing an example of the configuration of the pressure-sensitive adhesive tape of the present invention. FIG.
It is a schematic cross section which shows an example of the method of improving airtightness using the adhesive tape of this invention around the opening of a house. The adhesive tape 6 of the present invention is, for example, a base film 3 in which a polyethylene terephthalate film (hereinafter referred to as a PET film) 2 is laminated on a metal foil 1 made of aluminum foil or the like.
And an acrylic pressure-sensitive adhesive 4 laminated thereon. A release agent 5 may be applied to the PET film 2 as needed.

As a method for increasing the airtightness of an opening of a house or the like by using the adhesive tape 6 of the present invention, as shown in FIG. 2, for example, the adhesive tape 6 of the present invention is placed in a gap between members that impair airtightness. Is attached. FIG. 2 is an example of a window frame using an aluminum sash, which has a ventilation layer 22 between an outer wall material 20 and a hard urethane board 21,
An aluminum sash 25 is attached to the opening having the bar 24
It is attached through. A waterproof tape 27 is usually applied to the surface of the hard urethane board 21 on the side of the ventilation layer 22, and an airtight sheet 29 is usually applied between the hard urethane board 21 and the structural plywood 28. Here, the adhesive tape 6 of the present invention is
It is used by being attached to the gap between the bar 24, the picture frame 30, and the brim 26, so that the airtightness can be improved. That is, in the method for improving airtightness in the present invention, for example, the adhesive tape of the present invention is used around an opening of a house or the like so as to close a gap between a sash, a picture frame, a crosspiece, etc. from the indoor side.

[0028]

EXAMPLES Hereinafter, the pressure-sensitive adhesive tape of the present invention will be described in more detail with reference to specific examples and comparative examples. The present invention is not limited only to the following examples. Further, “parts” means “parts by weight”. (Example 1) 20 parts of isononyl acrylate, 80 parts of 2-ethylhexyl acrylate, 2 parts of acrylic acid as monomers constituting the acrylic copolymer, and 0.1 part of n-dodecanethiol as a chain transfer agent. 02 parts, 2,2-dimethyl-2-phenylacetophenone (Irgacure 651: Ciba-Geigy) 0.1 as a photopolymerization initiator
Part, hexadiol diacrylate as a crosslinking agent 0.0
5 parts were uniformly mixed, and the thickness at the end of polymerization was 1 ± 0.
It was coated so as to have a thickness of 1 mm, and a release treatment surface of a 38 μm-thick polyester film which had been similarly release-treated was covered so as to be in contact with the coating surface.

After irradiating the cover-polyester film with an irradiation intensity of ² mW / cm ² for 10 minutes using a chemical lamp and copolymerizing the above-mentioned monomer, the cover-polyester film is peeled off to obtain the desired adhesive tape. -Obtained. The base film was formed by laminating 20 μm thick polyethylene on one side of a 30 μm thick aluminum foil,
The polyethylene was subjected to a release treatment on the surface opposite to the surface in contact with the aluminum foil.

(Example 2) A substrate film having a thickness of 20 μm
An adhesive tape was obtained in the same manner as in Example 1 except that a single-layer stainless steel foil product was used. (Example 3) In the same manner as in Example 1 except that 30 parts of isomiristyl acrylate, 70 parts of n-butyl acrylate, and 2 parts of acrylic acid were used as monomers constituting the acrylic copolymer, An adhesive tape was obtained.

Comparative Example 1 2-ethylhexyl acrylate 60 was used as a monomer constituting the acrylic copolymer.
In the same manner as in Example 1, except that 35 parts by weight, 35 parts of n-butyl acrylate and 2 parts of acrylic acid were used. Comparative Example 2 An adhesive tape was obtained in the same manner as in Example 1 except that a polyester film having a thickness of 25 μm was used as a base film. Comparative Example 3 A butyl rubber-based adhesive obtained by mixing 20 parts of butyl rubber, 55 parts of carbon, 15 parts of petroleum resin, and 10 parts of polybutene was applied to a base film similar to that of Example 1 using a calendar roll. Coating was performed so that the thickness became 1 ± 0.1 mm to obtain an adhesive tape on which a butyl rubber-based adhesive was laminated.

The following evaluation was performed on the obtained pressure-sensitive adhesive tape. 1. SP adhesive strength (60 ° C.): Measured at a temperature of 60 ° C. according to JIS Z0237. 2. Repeated tensile test: 20 x 20 mm on stainless steel plate
Adhesive tape is applied in the area of, after 2 kg roller is reciprocated one time and press-bonded, and subjected to 2,000 times tensile fatigue under the condition of 7 mm span, 30 times / min. confirmed. 3. Shape retention: Adhesive tape having a width of 50 mm was stuck in a stepwise manner using a test jig having a stepwise cross section shown in the schematic diagram of FIG. 3, and the state of sticking after standing at room temperature for 24 hours was visually checked. did. 4. Airtightness: Using the apparatus shown in the schematic diagram of FIG. 4, the equivalent gap area was measured for an opening sample having an airtightness increased by using a pressure-sensitive adhesive tape by the method shown in FIG.
The difference from the equivalent gap area when there was no opening was determined. The equivalent gap area was calculated by the following equation. αA = 2.78 ° (γ / 2gQ ₀ ) αA: equivalent clearance area (cm ² ) γ: specific weight of air (kg / m ³ ) g: gravitational acceleration (m / s ² ) Q ₀ : indoor and outdoor pressure Leakage amount (m ³ ) at a difference of 1 mmAq Table 1 shows the evaluation results.

[0033]

[Table 1] As shown in Table 1, those using the pressure-sensitive adhesive tape of the present invention had excellent SP adhesive force, did not peel off even in a repeated fatigue test, and had good shape retention.
Moreover, the airtightness when the adhesive tape of the present invention was used in the opening of the house was good.

[0034]

According to the pressure-sensitive adhesive tape of the present invention, since the base film is mainly made of metal foil, the metal foil is easily plastically deformed when used as an airtight member of a building.
Since it is possible to adhere along the complicated shape of the opening, particularly the corner at the outside or the corner at the inside, it is possible to carry out close contact without generating a gap or wrinkles. In addition, since a specific acrylic pressure-sensitive adhesive having excellent elongation properties and heat resistance is used in combination with the above-described base film, even if the pressure-sensitive adhesive tape is repeatedly fatigued under the influence of thermal expansion and contraction. It does not peel off and can exhibit excellent adhesive strength even when the temperature becomes high in summer. Therefore, by using the pressure-sensitive adhesive tape of the present invention, the airtightness of the opening of the building can be significantly improved. Metal foil thickness is 20-200
In the case of μm, the above effect can be more reliably achieved.

[0035]

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing an example of the configuration of the pressure-sensitive adhesive tape of the present invention.

FIG. 2 is a schematic cross-sectional view showing an example of a method for increasing airtightness by using the pressure-sensitive adhesive tape of the present invention around an opening of a house.

FIG. 3 is a schematic cross-sectional view illustrating a test method of shape retention according to the present invention.

FIG. 4 is a schematic sectional view showing a test method of airtightness in the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Metal foil 2 PET film 3 Base film 4 Acrylic adhesive 5 Release agent 6 Adhesive tape 20 Outer wall material 21 Hard urethane board 22 Vent layer 23 Body edge 24 Bar 25 Aluminum sash 26 Collar 27 Waterproof tape 28 Structural plywood 29 Airtight sheet 30 picture frame

Claims (3)

[Claims] 1. An alkyl (meth) acrylate having an alkyl group having 9 to 18 carbon atoms in an amount of 5 to 60% by weight, and an alkyl (meth) acrylate having an alkyl group having 2 to 8 carbon atoms in an amount of 40 to 95%. A pressure-sensitive adhesive tape characterized in that an acrylic pressure-sensitive adhesive whose main component is an acrylic copolymer whose weight% is copolymerized is laminated on a base film mainly composed of a metal foil. 2. The adhesive tape according to claim 1, wherein the thickness of the metal foil is 20 to 200 μm. 3. A method for improving the airtightness of an opening by using the adhesive tape according to claim 1 around the opening of a building.