JP2001262090A - Waterproofing tape and waterproofing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a waterproofing tape that can be used to waterproof an opening such as the periphery of a window sash of a house without leaving the problem of leak from corners, can be easily applied even to corners, and can be applied without suffering wrinkles and to provide a method for waterproofing therewith. SOLUTION: Provided are a waterproofing tape 1 prepared by laying a pressure-sensitive adhesive layer 3 on either surface of a base sheet 2 subjected to a release treatment on both surfaces and a method for waterproofing gaps of a building with the tape 1. In the waterproofing method, the base sheet 2 is left laid at the linear part of the tape 1 after the tape 1 is stuck, a waterproofing tape 10 is stuck thereto from one direction, part A where a waterproofing tape 11 from the other direction overlaps the lower tape 10 whereas at each corner, the tape 10 is stuck to the upper tape 11 after the base sheet 20 is peeled therefrom to expose a pressure-sensitive adhesive layer 30.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproofing tape and a waterproofing method, and more particularly to a waterproofing tape and a waterproofing method suitably used for waterproofing openings such as around sashes of houses.

[0002]

2. Description of the Related Art Conventionally, an adhesive tape (waterproof tape) in which an adhesive layer is laminated on a flexible base material has been used for waterproofing an opening such as around a sash of a house. Examples of such waterproof tape include the following. Non-woven fabric, thermoplastic resin, etc., laminated with butyl rubber adhesive, Self-adhesive, rubberized asphalt laminated on one side of non-woven fabric, non-woven fabric surface (JP-A-61-28571),

[0003] In these waterproof tapes, a release paper is laminated on a surface on an adhesive side to form a wound body, or a release treatment is performed on a surface on a substrate side.

In order to perform waterproofing of a sash using these waterproof tapes, for example, the sash is stuck over a brim of the sash and a waterproof sheet covering the outer periphery of the sash. Usually, when the sash is applied to a substantially rectangular sash, the adhesive tape in two directions is overlapped at the four corners of the sash. At this time, the waterproof tapes overlapped with each other are constructed such that the adhesive layer of the upper tape overlaps the base material of the lower tape. Then, there is a problem that a gap is generated between the upper and lower tapes, and a water passage is formed in the lower tape edge, thereby causing water leakage.

[0005] In particular, products having a release treatment applied to the surface of the base material have a problem that the gap becomes large with time.
A product on which release paper is laminated has poor workability, and there is a problem that wrinkling is likely to occur in the tape when the product is applied while peeling the release paper.

[0006]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and when used for waterproofing an opening such as around a sash of a house, does not cause water leakage at the corners, and furthermore, it is possible to prevent water leakage at the corners. An object of the present invention is to provide a waterproof tape and a waterproof method that are easy to perform and do not wrinkle the tape during the work.

[0007]

The waterproof tape of the present invention comprises:
A pressure-sensitive adhesive layer is laminated on one side of a base sheet having both sides subjected to a release treatment.

[0008] The waterproofing method of the present invention is a method for waterproofing a gap in a building using the waterproofing tape of the present invention,
In the straight part, the base sheet is kept laminated even after pasting, while in the corner part, after the waterproof tape is adhered from one direction, the lower waterproof part is overlapped with the waterproof tape from the other direction. The base sheet of the tape is peeled off to expose the pressure-sensitive adhesive layer, and the upper waterproof tape is attached.

The base sheet used for the waterproof tape of the present invention is not particularly limited as long as it has flexibility enough to be easily applied, and examples thereof include a synthetic resin sheet and a nonwoven fabric. It is preferable to use a sheet-like tape which can be easily cut by hand in the longitudinal direction or the width direction of the tape and can be cut by hand in a straight line. Such materials include, for example, synthetic fibers such as polyethylene, polypropylene, polyester, nylon, and vinylon; woven fabric in which cotton and pulp spun yarns are woven vertically and horizontally; Laminated polypropylene; uniaxially stretched films such as polyethylene, polypropylene, polystyrene, and polyvinyl chloride.

When the thickness of the base sheet is small, it may be cut to an unnecessary part because the tear strength is small, and when the base sheet is thick, it may be difficult to cut it by hand or the workability of sticking may be deteriorated. 500 μm is preferred.

In the waterproof tape of the present invention, a release treatment is performed on both sides of the base sheet. For the release treatment, a conventionally known method is used, and usually, the releasability is enhanced by treating the base sheet with a release agent. As the release agent, those of silicone type, fluorine type, long chain alkyl type and the like are used.

In the waterproof tape of the present invention, a pressure-sensitive adhesive layer is laminated on one surface of the substrate sheet subjected to the release treatment. The pressure-sensitive adhesive used for the pressure-sensitive adhesive layer is not particularly limited as long as it can be attached to an adherend such as a sash and a waterproof sheet covering the outer periphery thereof. For example, an acrylic pressure-sensitive adhesive, butyl rubber A self-adhesive material such as a pressure-sensitive adhesive or a rubberized asphalt pressure-sensitive adhesive is suitably used.

The pressure-sensitive adhesive is made of an aluminum plate and JIS
JIS Z02 of the waterproof sheet specified in A6111
The 90 ° peel strength measured according to 37 is 6N / 2
5 mm or more is preferable. If the peel strength is low, the sash and the waterproof sheet that covers the outer periphery of the sash are less likely to be attached to an adherend.

On the other hand, if the thickness of the pressure-sensitive adhesive layer is too small, the adherence of the adherend to irregularities deteriorates. If the thickness is too large, the waterproof tape is superimposed and adhered when actually applied. At times, a gap may be formed in the fore-edge part.
~ 2 mm is preferred.

The waterproof tape of the present invention is usually wound up in a roll and stored. Therefore, it is necessary for the release-treated base sheet to have an adhesive strength to the adhesive on the side in contact with the adhesive greater than the adhesive strength to the adhesive on the opposite side. In this case, the adhesive force (S ₁ ) of the base sheet to the adhesive on the side in contact with the adhesive is 0.5 to 5 N / 25.
mm, the adhesive force (S ₂ ) of the opposite side (the side in contact with the adhesive layer of the outer waterproof tape when wound) with respect to the adhesive is preferably 0.1 to 10 N / 25 mm, and the ratio (S ₁₎ / S
₂ ) is preferably 1.2 or more. In this way, the waterproof tape wound in a roll can be spread between the pressure-sensitive adhesive layer of the outer waterproof tape and the base sheet of the inner waterproof tape.

The waterproofing method of the present invention is a method of attaching the waterproofing tape of the present invention to an adherend. In this case, for example, when the waterproofing tape is installed on a sash of a house, a plurality of waterproofing tapes are usually attached to the sash. Adhere linearly on four sides. At this time, the waterproof tapes overlap each other at the four corners of the sash. Therefore, at these four corners, the release-treated base sheet of the lower waterproof tape is peeled off, and an adhesive layer of the upper waterproof tape is adhered thereon so as to overlap. By doing so, there is no gap between the upper and lower tapes, no water passage in the lower tape edge, and no water leakage or the like.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing an example of the waterproof tape of the present invention. As shown in FIG. 1, the waterproof tape 1 of the present invention has a pressure-sensitive adhesive layer 3 laminated on one surface of a base sheet 2. In the base sheet 2, the surface 2 a on the side where the pressure-sensitive adhesive layer 3 is laminated and the surface 2 b on the opposite side are subjected to a release treatment.

FIG. 2 shows a state in which a waterproof tape is applied to a sash of a house by the waterproofing method of the present invention, (a) is a plan view, (b) is a side view, and FIG. III-III showing the laminated structure of the waterproof tape in part A in an enlarged manner
It is arrow sectional drawing.

In FIG. 2, 10 and 11 are waterproof tapes,
4 is a sash and 5 is a waterproof sheet.

In the waterproofing method of the present invention, first, a waterproof sheet 5 whose central portion is cut out is adhered on a wooden bar 6, and a sash 4 is provided on the cut-out portion. The waterproof tapes 10 and 11 are stuck on the four sides of the sash 4 in a straight line so as to cross the joint between the waterproof sheet 6 and the sash 4 so as to be orthogonal to each other. At the portion A where the waterproof tapes 10 and 11 overlap at the four corners of the sash 4, the base sheet 20 of the lower waterproof tape 10 is peeled off, and the upper waterproof tape 11 is placed on the adhesive layer 30 exposed on the surface. Are adhered so that the pressure-sensitive adhesive layers 31 overlap.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in more detail based on embodiments. (Example 1) 20 parts by weight of butyl acrylate, 80 parts by weight of 2-ethylhexyl acrylate, 6 parts by weight of acrylic acid, and 0.1 part by weight of a photopolymerization initiator (trade name "Irgacure 651" manufactured by Ciba Specialty Chemicals) Was mixed to obtain a pressure-sensitive adhesive composition. Next, the obtained pressure-sensitive adhesive composition was spread on a polyethylene terephthalate film subjected to a release treatment, and was subjected to bulk polymerization using an ultraviolet lamp to form an acrylic pressure-sensitive adhesive sheet having a thickness of 1.0 mm.

On the other hand, as a base sheet, polyethylene flat yarn laminated fabric laminated with polyethylene (trade name "PE Lamicloth" manufactured by Hagiwara Kogyo Co., Ltd.)
And treated with a long-chain alkyl release agent on both sides such that a release layer having a thickness of 1 μm and the other having a thickness of 2 μm was formed to obtain a base sheet having both sides subjected to a release treatment. .

Then, the pressure-sensitive adhesive layer of the pressure-sensitive adhesive sheet is
The substrate sheet was laminated on the surface on which the release layer having a thickness of 1 μm was formed, wound up in a roll shape with the pressure-sensitive adhesive layer side inside, and cut into a width of 75 mm to obtain a waterproof tape.

As shown in FIGS. 2 and 3, the waterproof tape obtained in this manner is applied to a waterproof sheet 6 (manufactured by Asahi DuPont Flash Span Products) so as to be orthogonal to the four sides of the aluminum sash 4 respectively. , And "Tyvek 1060") and the sash 4 in a straight line. And waterproof tape 1 at four corners of sash 4
At the portion A (75 mm square) where 0 and 11 overlap, the base sheet 20 of the lower waterproof tape 10 is peeled off, and the adhesive layer of the upper waterproof tape 11 is placed on the adhesive layer 30 exposed on the surface. 31 were adhered so as to overlap each other.

Example 2 As the pressure-sensitive adhesive composition, butyl rubber (trade name “Escorant 1” manufactured by Tonex Corporation) was used.
0 "), 100 parts by weight of a plasticizer (trade name" EmaWet "manufactured by NOF Corporation) and 1 part by weight of oil (trade name" YS Oil DS "manufactured by Yasuhara Chemical Co., Ltd.) were uniformly mixed. A waterproof tape was obtained in the same manner as in Example 1 except that a butyl rubber-based pressure-sensitive adhesive was used, and was applied in the same manner as in Example 1.

Example 3 As a pressure-sensitive adhesive composition, 100 parts by weight of asphalt, 50 parts by weight of natural rubber, and 10 parts by weight of a tackifying resin (trade name "YS resin" manufactured by Yashara Chemical Co., Ltd.) were uniformly mixed. A waterproofing tape was obtained in the same manner as in Example 1 except that a rubberized asphalt-based pressure-sensitive adhesive was used, and was applied in the same manner as in Example 1.

(Comparative Example 1) Only one side of the base sheet was 2 μm
m, and a waterproofing tape was obtained in the same manner as in Example 1 except that the pressure-sensitive adhesive layer was laminated on the other surface.

(Comparative Example 2) A base sheet having a basis weight of 50
g / m ² nonwoven fabric made of rayon, a rubberized asphalt-based pressure-sensitive adhesive (same as in Example 3) was used as the pressure-sensitive adhesive layer, and a release paper (manufactured by Kite Chemical Co., Ltd., product number “SLK-80C”) was provided on the surface of the pressure-sensitive adhesive layer. )) To obtain a waterproof tape, which was constructed in the same manner as in Example 1.

(Evaluation) The waterproof tapes, substrate sheets obtained in Examples 1 to 3 and Comparative Examples 1 and 2, and panels obtained by applying the waterproof tapes were subjected to the following evaluations.

1. Adhesive strength to adherend The obtained waterproof tape is based on JIS Z0237,
Aluminum plate and waterproof sheet (made by Asahi DuPont Flash Spun Products Co., Ltd., trade name "Divec 106
0 ").

2. Base sheet peel strength The peel strength between the release surface of the base layer and the pressure-sensitive adhesive layer is measured according to JIS Z
It was measured in accordance with 0237. At this time, the measurement was performed while the base material layer was peeled in the direction of 180 degrees with respect to the pressure-sensitive adhesive layer fixed on the flat surface.

3. Water spraying test A jet nozzle is used to spray water at a flow rate of 100 liters / min toward the waterproof tape-attached surface of the panel obtained by applying the waterproof tape, and the panel back surface after 5 minutes and 60 minutes The state of water leakage on the side was visually observed.

The above results are summarized in Table 1.

[0034]

[Table 1]

[0035]

According to the waterproof tape of the present invention, the pressure-sensitive adhesive layer is laminated on one side of the base sheet whose both sides have been release-treated, so that the pressure-sensitive adhesive layer and the base sheet are easily peeled off. In places where the waterproof tape is superimposed and pasted, the base sheet of the waterproof tape on the lower side can be peeled off and pasted, so that the construction is easy and the tape does not wrinkle during construction, Since no gap is generated, no water leakage occurs.

Further, the waterproofing method of the present invention is a method for waterproofing a gap in a building using the waterproofing tape of claim 1, wherein the base material sheet is laminated on the straight portion even after pasting. On the other hand, at the corner, after attaching the waterproof tape from one direction, the base sheet of the lower waterproof tape is peeled off at the portion where the waterproof tape from the other direction overlaps to expose the adhesive layer. Since the upper waterproof tape is attached, it is easy to install, no wrinkles are formed in the tape at the time of installation, and gaps due to overlapping are hard to occur,
Even when used for waterproofing openings such as around sashes of houses, water does not leak at corners.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example of a waterproof tape of the present invention.

FIG. 2 shows a state in which a waterproof tape is applied to a sash of a house by the waterproofing method of the present invention, (a) is a plan view thereof,
(B) is a side view.

FIG. 3 is an enlarged cross-sectional view taken along the line III-III of the laminated structure of the waterproof tape in a portion A of FIG. 2;

[Explanation of symbols]

 1, 10, 11 Waterproof tapes 2, 20, 21 Base sheet 3, 30, 31 Adhesive layer A Part where waterproof tapes 10, 11 overlap

Claims (2)

[Claims] 1. A waterproof tape characterized in that a pressure-sensitive adhesive layer is laminated on one side of a base sheet having both sides released. 2. A method for waterproofing a gap in a building using the waterproof tape according to claim 1, wherein the base material sheet is kept laminated even after the linear portion is adhered, and the corner portion is waterproofed. After attaching the waterproof tape from one direction, the base sheet of the lower waterproof tape is peeled off where the waterproof tape overlaps from the other direction to expose the adhesive layer, and the upper waterproof tape is attached. A waterproofing method characterized by wearing.