JP7562452B2 - Aluminum glass cloth tape and duct - Google Patents

Description

The present invention relates to aluminum glass cloth tape and ducts.

Aluminum glass cloth tape, obtained by laminating an adhesive layer on an aluminum glass cloth substrate made by bonding aluminum foil and glass cloth, is widely used for bundling insulation materials, duct repair, etc. However, glass cloth generally has high strength but low or no hand tearability. Therefore, when using aluminum glass cloth tape, scissors or the like must be used to cut it, resulting in low workability.

Patent Documents 1 and 2 disclose a tape obtained by laminating an adhesive layer onto a substrate made of aluminum foil and polyester film or cotton cloth that is easily torn by hand, with the aim of improving hand-tearability.

JP 2010-53208 A JP 2010-53206 A

However, although the tapes disclosed in Patent Documents 1 and 2 have good hand-tearability, the heat resistance of the substrate is low at around 200°C. In addition, polyester film and cotton cloth have lower tensile strength than glass cloth, so the substrate may break when binding heavy objects. For this reason, it is desirable to impart good hand-tearability to aluminum glass cloth tapes that contain an aluminum glass cloth substrate.

The present invention aims to provide an aluminum glass cloth tape that is easy to cut by hand, and a duct wrapped with the aluminum glass cloth tape.

The present invention includes the following embodiments:

[1] An aluminum glass cloth substrate including an aluminum foil and a glass cloth;
An adhesive layer;
An aluminum glass cloth tape comprising:
The aluminum glass cloth tape has a tensile strength of 50 to 160 N/cm in the longitudinal direction of the aluminum glass cloth tape and 300 to 400 N/cm in the width direction of the aluminum glass cloth tape at a temperature of 23°C and a relative humidity of 50%.

[2] The aluminum glass cloth tape described in [1], in which the aluminum foil and the glass cloth are bonded with a urethane adhesive.

[3] The aluminum glass cloth tape according to [2], wherein the amount of the urethane adhesive applied is 5 to 15 g/ ^m2 .

[4] An aluminum glass cloth tape according to any one of [1] to [3], in which the glass cloth is formed by weaving together a first glass fiber bundle arranged along the longitudinal direction of the aluminum glass cloth tape and a second glass fiber bundle arranged along the width direction of the aluminum glass cloth tape.

[5] An aluminum glass cloth tape according to [4], in which the diameter of the first glass filaments constituting the first glass fiber bundle is 4 to 7 μm, and the diameter of the second glass filaments constituting the second glass fiber bundle is 7 to 10 μm.

[6] An aluminum glass cloth tape according to any one of [1] to [5], which is an aluminum glass cloth tape for duct sealing.

[7] A duct wrapped with the aluminum glass cloth tape described in [6].

The present invention provides an aluminum glass cloth tape that is easy to cut by hand, and a duct wrapped with the aluminum glass cloth tape.

[Aluminum glass cloth tape]
The aluminum glass cloth tape according to this embodiment includes an aluminum glass cloth substrate including aluminum foil and glass cloth, and an adhesive layer, wherein the tensile strength of the aluminum glass cloth tape at a temperature of 23° C. and a relative humidity of 50% is 50 to 160 N/cm in the longitudinal direction of the aluminum glass cloth tape and 300 to 400 N/cm in the width direction of the aluminum glass cloth tape.

The aluminum glass cloth tape according to this embodiment has a tensile strength in the longitudinal direction (MD direction) of the aluminum glass cloth tape within the above range, and a tensile strength in the width direction (TD direction) within the above range, so that it can be imparted with good hand-cuttability. Indicators of hand-cuttability include "ease of cutting", which indicates the degree of force required for cutting, and "cross-sectional shape", which indicates how nearly parallel the aluminum glass cloth tape can be cut when cut and whether glass fiber threads are exposed from the cut surface. In the aluminum glass cloth tape according to this embodiment, since the tensile strength in the longitudinal direction of the aluminum glass cloth tape is within the above range, it breaks well when force is applied by hand perpendicular to the glass fibers in the longitudinal direction, so it is presumed that the "ease of cutting" is good. In addition, in the aluminum glass cloth tape according to this embodiment, the tensile strength in the longitudinal direction and the width direction of the aluminum glass cloth tape are each within the above range, so that the strength of the glass fibers in the width direction is higher than that of the glass fibers in the longitudinal direction, and when a load is applied by hand, the glass fibers in the width direction do not break, and the glass fibers in the longitudinal direction break preferentially. Therefore, it is presumed that the "cross-sectional shape" is good. Also, if the strength of the glass fibers in the width direction is too high, stress in the direction perpendicular to the width direction is concentrated and the tape is easily broken, and when a load is applied by hand, the glass fibers in the longitudinal direction are broken simultaneously in multiple rows, and the cross-sectional shape is deteriorated. Therefore, it is presumed that the aluminum glass cloth tape according to this embodiment has good "ease of cutting" and "cross-sectional shape", and as a result, good hand-cuttability can be achieved.

(Aluminum foil)
The aluminum foil according to this embodiment is not particularly limited, but the thickness of the aluminum foil is preferably 5 to 50 μm, more preferably 15 to 25 μm, from the viewpoint of curved surface conformability.

(Glass cloth)
The glass cloth according to this embodiment can be a sheet-like glass fiber woven fabric. For example, the glass cloth can be formed by weaving together a first glass fiber bundle arranged along the longitudinal direction of the aluminum glass cloth tape and a second glass fiber bundle arranged along the width direction of the aluminum glass cloth tape. That is, the first glass fiber bundle and the second glass fiber bundle can be woven in a direction perpendicular to each other on a plane. These glass fiber bundles can also be called glass yarns. The glass fibers constituting each glass fiber bundle are called glass filaments.

The type of glass filament is not particularly limited. For example, glass filaments composed of glass with an alkali content of 2.0 mass% or less, alkali-resistant glass, acid-resistant alkali-lime-containing glass, high-strength, high-elasticity glass, E glass composed of SiO ₂ (53 mass%), Al ₂ O ₃ (15 mass%), CaO (21 mass%), MgO (2 mass%), B ₂ O ₃ (8 mass%), and Na ₂ O + K ₂ O (0.3 mass%), and S glass composed of SiO ₂ (64 mass%), Al ₂ O ₃ (25 mass%), MgO (10 mass%), and Na ₂ O + K ₂ O (0.3 mass%), etc. may be used. These glass filaments may be used alone or in combination of two or more.

The diameter of the glass filaments is preferably 3 to 10 μm, more preferably 5 to 9 μm, from the viewpoint of forming an aluminum glass cloth substrate that is difficult to break and is flexible. The number of glass filaments constituting the glass fiber bundle is preferably 50 to 1500, more preferably 100 to 1200. The weaving density of the first glass fiber bundle in the longitudinal direction and the second glass fiber bundle in the width direction constituting the glass cloth is preferably 10 to 100 fibers/inch, more preferably 20 to 70 fibers/inch. By having the weaving density of 10 fibers/inch or more, the spacing between the glass fibers can be narrowed, and the flexibility of the aluminum glass cloth substrate can be maintained. In addition, by having the weaving density of 100 fibers/inch or less, further breakage of adjacent glass fibers when a glass fiber breaks can be suppressed. The weaving method of the glass cloth is not particularly limited, but for example, a plain weave, a tanabae weave, a satin weave, a twill weave, etc. can be used. The thickness of the glass cloth can be, for example, 0.12 to 0.17 mm.

In this embodiment, for example, the diameter and/or number of the glass filaments constituting the first glass fiber bundle and the second glass fiber bundle can be changed to adjust the longitudinal and widthwise tensile strengths of the aluminum glass cloth tape according to this embodiment within the range of this embodiment. From the viewpoint of easily adjusting the longitudinal and widthwise tensile strengths within the range of this embodiment, it is preferable that the diameter (d1) of the first glass filament constituting the first glass fiber bundle is 4 to 7 μm, and the diameter (d2) of the second glass filament constituting the second glass fiber bundle is 7 to 10 μm. In addition, the ratio (d1/d2) of the diameter (d1) of the first glass filament to the diameter (d2) of the second glass filament is preferably 0.2 to 0.9, more preferably 0.5 to 0.8. In addition, it is preferable that the number (n1) of the first glass filaments constituting the first glass fiber bundle is 100 to 300, and the number (n2) of the second glass filaments constituting the second glass fiber bundle is 500 to 1000. In addition, the ratio (n1/n2) of the number of first glass filaments (n1) to the number of second glass filaments (n2) is preferably 0.05 to 0.6, and more preferably 0.1 to 0.3.

The glass cloth according to this embodiment may be surface-treated with a surface treatment agent from the viewpoint of wettability of the adhesive. The surface treatment agent is not particularly limited, but a silane coupling agent can be preferably used. Examples of the silane coupling agent include aminopropyltrimethoxysilane, vinyltrimethoxysilane, methacryloxypropyltrimethoxysilane, and acryloxypropyltrimethoxysilane. These may be used alone or in combination of two or more.

(Aluminum glass cloth substrate)
The aluminum glass cloth substrate according to the present embodiment includes the aluminum foil and the glass cloth. The aluminum glass cloth substrate may include at least the aluminum foil and the glass cloth, and may further include other layers, such as an anchor layer for improving the adhesion between the pressure-sensitive adhesive layer and the aluminum glass cloth substrate.

The aluminum glass cloth substrate can be formed, for example, by bonding aluminum foil and glass cloth with an adhesive. Examples of adhesives include acrylic adhesives, polyester adhesives, ethylene-vinyl acetate copolymer adhesives, vinyl chloride-vinyl acetate copolymer adhesives, urethane adhesives, and the like. One of these adhesives may be used, or two or more may be used in combination. Of these, urethane adhesives are preferred as the adhesive, from the viewpoint of improving the hand tearability of the aluminum glass cloth tape.

The aluminum glass cloth substrate can be formed, for example, by applying the adhesive to one side of an aluminum foil using a bar coater or the like, and then bonding it to one side of a glass cloth. When the adhesive is a urethane adhesive, the amount of the urethane adhesive applied is preferably 5 to 15 g/ ^m2 , and more preferably 7 to 12 g/ ^m2 , from the viewpoint of improving the hand tearability of the aluminum glass cloth tape. The thickness of the aluminum glass cloth substrate is not particularly limited, but can be, for example, 0.12 to 0.17 mm.

(Adhesive Layer)
The adhesive layer according to the present embodiment can be provided on the glass cloth surface of the aluminum glass cloth substrate. The adhesive constituting the adhesive layer is not particularly limited, and examples thereof include natural rubber adhesives, synthetic rubber adhesives, acrylic adhesives, and silicone adhesives. These adhesives may be used alone or in combination of two or more. Among these, aluminum glass cloth tapes are often used for heat-resistant applications, and silicone adhesives are preferred as adhesives from the viewpoint of high heat resistance. The adhesive formulation is not particularly limited, and examples thereof include solvent type, emulsion type, solventless type, and hot melt type.

The adhesive layer can be formed, for example, by applying an adhesive to the glass cloth surface of the aluminum glass cloth substrate. The amount of adhesive applied is not particularly limited, but is preferably 30 to 120 g/ ^m2 , and more preferably 40 to 100 g/ ^m2 . By applying an amount of 30 g/m2 ^or more, sufficient tackiness can be obtained. Furthermore, by applying an amount of 120 g/m2 or ^less , stickiness on the side of the aluminum glass cloth tape can be suppressed.

(Physical properties of aluminum glass cloth tape)
The tensile strength of the aluminum glass cloth tape according to this embodiment at a temperature of 23°C and a relative humidity of 50% is 50 to 160 N/cm in the longitudinal direction of the aluminum glass cloth tape, and 300 to 400 N/cm in the width direction of the aluminum glass cloth tape. When the tensile strength in the longitudinal direction is within the above range, the "ease of cutting" is particularly good. Furthermore, when the tensile strengths in the longitudinal direction and the width direction are each within the above range, the "cross-sectional shape" is particularly good. The tensile strength in the longitudinal direction is preferably 60 to 155 N/cm, more preferably 70 to 150 N/cm, and even more preferably 80 to 140 N/cm. The tensile strength in the width direction is preferably 310 to 390 N/cm, more preferably 320 to 380 N/cm, and even more preferably 330 to 370 N/cm. The ratio (t1/t2) of the tensile strength in the longitudinal direction (t1) to the tensile strength in the transverse direction (t2) is preferably 0.15 to 0.60, more preferably 0.17 to 0.50, and even more preferably 0.20 to 0.45.

The tensile strength of the aluminum glass cloth tape is measured by the following method. The aluminum glass cloth tape is punched into the shape of a No. 3 dumbbell as specified in JIS K 6251, and the tensile strength in the longitudinal and transverse directions is measured using a Tensilon universal testing machine RTF-1350 at a temperature of 23°C and a relative humidity of 50%. The initial chuck distance during measurement is 40 mm, and the test speed is 5 mm/min.

The thickness of the aluminum glass cloth tape is not particularly limited, but can be, for example, 0.12 to 0.17 mm.

(Application)
The aluminum glass cloth tape according to the present embodiment has good hand tearability and high workability, and is therefore suitable as an aluminum glass cloth tape for duct sealing. It can also be used as an aluminum glass cloth tape for bundling heat insulating members, bundling wire harnesses, protecting heater parts, etc.

[duct]
The duct according to the present embodiment is wrapped with the aluminum glass cloth tape according to the present embodiment. For example, the aluminum glass cloth tape according to the present embodiment is wrapped around the joints of duct piping. The aluminum glass cloth tape has high strength and heat resistance, and is easy to tear by hand when wrapping, so workability is high. The duct according to the present embodiment is installed, for example, in a smoke exhaust duct, etc.

The following examples are provided to more specifically explain the embodiments of the present invention, but the present invention is not limited to these examples. The tensile strength, adhesive strength, holding strength, probe tack, and hand tearability (ease of tearing, cross-sectional shape) of the aluminum glass cloth tape were evaluated using the following methods.

[Tensile strength]
The prepared aluminum glass cloth tape was punched out into the shape of a No. 3 dumbbell as specified in JIS K 6251, and the tensile strength in the longitudinal direction and width direction was measured using a Tensilon universal testing machine RTF-1350 under conditions of a temperature of 23°C and a relative humidity of 50%. The initial chuck distance during measurement was 40 mm, and the test speed was 5 mm/min.

[Adhesive strength]
The adhesive strength of the prepared aluminum glass cloth tape was measured in accordance with JIS Z 0237 at a temperature of 23° C. and a relative humidity of 50% using a Tensilon universal testing machine RTF-1350.

[Holding power]
The aluminum glass cloth tape thus prepared was cut to a width of 25 mm and a length of 100 mm, and then bonded to a 25 mm long, 1 kg stainless steel plate (SUS304). The bonded aluminum glass cloth tape was hung vertically in an oven at 40° C., and the time until the stainless steel plate fell was measured, which was taken as the holding strength.

[Probe Tack]
The probe tack of the prepared aluminum glass cloth tape was measured in accordance with ASTM D 2979 under conditions of a temperature of 23° C. and a relative humidity of 50% using a TE-6001 probe tack tester manufactured by Tester Sangyo Co., Ltd.

[Easy to cut by hand]
The prepared aluminum glass cloth tape was processed to a width of 19 mm and a length of 100 mm. Next, the processed aluminum glass cloth tape (test piece) was placed on a horizontal table, the center of the aluminum glass cloth tape was pressed with the thumb of one hand, and the aluminum glass cloth tape of the part pressed with the other hand was twisted in the width direction with the fingers, and the ease of cutting and the cross-sectional shape were evaluated. The evaluation was performed on five test pieces and evaluated according to the following indexes.
(Easy to cut)
A: All test pieces could be cut easily.
B: All test pieces required force to cut.
C: None of the test pieces could be cut.
(Cross-sectional shape)
A: All test pieces were cut in the width direction of the aluminum glass cloth tape.
B: Some test pieces were not cut in the width direction of the aluminum glass cloth tape.
C: None of the test pieces were cut in the width direction of the aluminum glass cloth tape, and glass fiber threads were exposed from the cut surface.

[Example 1]
(Preparation of aluminum glass cloth substrate)
Glass fiber bundles A1 to A3, B1 to B5, C1 to C2, and D1 shown in Table 1 were prepared. In Table 1, for example, glass fiber bundle A1 is made of E glass and is a glass fiber bundle in which 100 glass filaments having a diameter of 5 μm are bundled. In this example, glass fiber bundle A1 was used as the first glass fiber bundle arranged in the longitudinal direction, and glass fiber bundle B3 was used as the second glass fiber bundle arranged in the width direction. The glass fiber bundle A1 as the first glass fiber bundle was arranged at equal intervals so that the fiber density was 60 fibers/inch, and the glass fiber bundle B3 as the second glass fiber bundle was arranged at equal intervals so that the fiber density was 25 fibers/inch, and these were plain woven to produce a glass cloth. Next, a urethane-based adhesive (product name: "Evergrip 1330", manufactured by Toa Gosei Co., Ltd.) was applied to an aluminum foil having a thickness of 20 μm with a bar coater to an application amount of 9 g/m ² , and this was bonded to the glass cloth to produce an aluminum glass cloth substrate.

(Preparation of aluminum glass cloth tape)
To 180 parts by mass of a silicone adhesive (trade name: "XR37-B6722", manufactured by Momentive Japan Co., Ltd.), 5 parts by mass of an organic peroxide (trade name: "Niper BMT-K40", manufactured by Nippon Oil & Fats Co., Ltd.) was added as a curing agent, and the mixture was stirred at room temperature for 5 minutes to prepare an adhesive. The obtained adhesive was applied to a fluorine-based release paper (trade name: "SS4A", manufactured by Nippa Co., Ltd.) using a comma coater so that the coating amount after drying was 60 g/m ² , and dried at 90 ° C. for 2 minutes. The dried adhesive was transferred to the surface of the glass cloth side of the aluminum glass cloth substrate. After further aging at 100 ° C. for 3 hours, the release paper was peeled off and slit to a width of 50 mm to prepare a 30 m roll of aluminum glass cloth tape.

The resulting aluminum glass cloth tape was evaluated for tensile strength, adhesive strength, holding power, probe tack, and hand tearability (ease of tearing, cross-sectional shape) using the methods described above. The results are shown in Table 2.

[Examples 2 to 6, Comparative Examples 1 to 6]
Aluminum glass cloth tapes were produced and evaluated in the same manner as in Example 1, except that the adhesives shown in Tables 2 and 3 were used as the first glass fiber bundle, the second glass fiber bundle, and the adhesive between the aluminum foil and the glass cloth. The results are shown in Tables 2 and 3. As the acrylic adhesive, EA-G34/CAT-EP8 manufactured by Toyochem Co., Ltd. was used.

As shown in Tables 2 and 3, the aluminum glass cloth tapes of Examples 1 to 6, which are the aluminum glass cloth tapes according to this embodiment, were both good in terms of ease of cutting and cross-sectional shape, and had good hand-tearability. Furthermore, a comparison between Examples 2 and 3 revealed that the use of a urethane adhesive as the adhesive between the aluminum foil and the glass cloth improved hand-tearability (cross-sectional shape). On the other hand, the aluminum glass cloth tapes of Comparative Examples 1 to 6, whose longitudinal or transverse tensile strengths were outside the range of this embodiment, had poor ease of cutting and/or cross-sectional shape, and had poor hand-tearability. Note that the adhesive performance (adhesive strength, holding strength, and probe tack) was good in all cases, regardless of the type of aluminum glass cloth substrate.

Claims (7)

An aluminum glass cloth substrate including an aluminum foil and a glass cloth;
An adhesive layer;
An aluminum glass cloth tape comprising:
The aluminum glass cloth tape has a tensile strength of 50 to 160 N/cm in the longitudinal direction of the aluminum glass cloth tape and 300 to 400 N/cm in the width direction of the aluminum glass cloth tape at a temperature of 23°C and a relative humidity of 50%. The aluminum glass cloth tape according to claim 1, wherein the aluminum foil and the glass cloth are bonded with a urethane adhesive. The aluminum glass cloth tape according to claim 2, wherein the amount of the urethane adhesive applied is 5 to 15 g/ ^m2 . The aluminum glass cloth tape according to any one of claims 1 to 3, wherein the glass cloth is formed by weaving together a first glass fiber bundle arranged along the longitudinal direction of the aluminum glass cloth tape and a second glass fiber bundle arranged along the width direction of the aluminum glass cloth tape. The aluminum glass cloth tape according to claim 4, wherein the diameter of the first glass filaments constituting the first glass fiber bundle is 4 to 7 μm, and the diameter of the second glass filaments constituting the second glass fiber bundle is 7 to 10 μm. The aluminum glass cloth tape according to any one of claims 1 to 5, which is an aluminum glass cloth tape for duct sealing. A duct wrapped with the aluminum glass cloth tape described in claim 6.