JPH09170306A - Asphalt-based cap sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an exposed asphalt-based cap sheet for waterproofing without sand, which is excellent in weatherability and design, at low cost by laying out one after another a highly weatherable resin layer, a support member, an improved asphalt layer and a reinforcing material and so forth. SOLUTION: A highly weatherable resin layer, a PET film as a support member, a resin layer easily bondable to asphalt, polyester pan bond as a reinforcing material, a modified asphalt layer, an autohesion layer and a release sheet are provided one after another from above, thereby constituting an exposed waterproof asphalt-based sheet cap. A highly weatherable resin layer is provided on the cap sheet as a pigmented layer. More preferably, highly weatherable patterns may be provided thereon. Then, there will be available a product which is designed with beautiful patterns entirely different from the prior art asphalt-based cap sheet.

Description

Detailed Description of the Invention

The present invention relates to an asphalt-based cap sheet for exposure waterproofing.

TECHNICAL FIELD OF THE INVENTION

[0002]

2. Description of the Related Art The waterproof construction method is roughly classified into the following two types according to its finishing mode. That is, one is an exposure waterproofing method and the other is a holding waterproofing method. In the former exposed waterproof construction method, a waterproof sheet having excellent weather resistance is provided on the uppermost layer, and the waterproof sheet is used as it is while being exposed to the atmosphere. On the other hand, the hold down waterproof method is one in which concrete is placed on the waterproof layer or a molded protective plate such as tile is laid, and it can be used for multiple purposes such as a parking lot or a rooftop amusement park.

Due to their performance, sheet waterproofing and urethane coating waterproofing made of rubber or plastic cannot be applied to the presser foot waterproofing and are used only for the exposure waterproofing. However, the asphalt waterproofing is used for both the holding waterproofing and the exposing waterproofing. Is also most applicable because it is also applicable. As the asphalt waterproofing material applied to the exposure waterproofing, the roofing with sand in which blown asphalt or modified asphalt is coated on both sides of the reinforcing material and the surface is provided with mineral sand grains is predominantly used. The material may have an undesired appearance, with partial shedding of sand over prolonged exposure. Degradation of the asphalt layer is promoted at the part where the sand has fallen off, which is not preferable in terms of waterproof performance.

On the other hand, like the outer wall, the roof has begun to be reviewed by the designers and owners as an object of design and design, and the number of cases in which the appearance of sandy roofing is unsatisfactory is increasing. In order to meet the above problems and demands, a high weather resistance non-sanded exposed waterproof asphalt-based cap sheet is required.

As one countermeasure, a cap sheet provided with a metal foil on the surface is put on the market, and although it has excellent weather resistance and appearance, the price is about three times that of the conventional sanded roofing. Therefore, it has not become popular as a substitute for roofing with sand.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a relatively inexpensive, non-sandy, exposed waterproof asphalt-based cap sheet which is excellent in weather resistance and design.

[0007]

The present invention, in order from the top,
High weather resistance resin layer / Support / Resin layer for asphalt easy adhesion / Asphalt or modified asphalt layer / Reinforcement material /
The present invention relates to an asphalt-based cap sheet for exposure and waterproofing, comprising an asphalt or a modified asphalt layer / adhesion-preventing material.

In the present invention, a self-adhesive layer / release sheet may be provided in place of the anti-adhesive material.

Further, in the present invention, the highly weather resistant resin layer may be a colored layer, and a highly weather resistant resin pattern layer may be provided thereon.

The high weather resistance resin may be of a type in which a solvent (solvent or water) is dried to form a film, but a reaction curing type is preferable because a higher performance layer can be obtained. Further, even if it is excellent in weather resistance, if the film is too hard, it tends to be broken or wrinkled when wound in a roll shape, and therefore it is preferable to have appropriate flexibility. The high weather resistance resin can be selected from fluorine-based, acrylic silicon-based, acrylic urethane-based, polyester-based, acrylic-based, urethane-based, polyamide-based, vinyl chloride-based, etc.,
Fluorine-based resin is too expensive, and acrylic-silicone-based film is rigid, so it is difficult to obtain the weather resistance that only a few μ can be coated. Acrylic type and acrylic urethane type. The thickness of the coating film is 5 to 50.
μ, preferably 10 to 20 μ.

In order to form the high weather resistance resin layer, since the high weather resistance resin coating cannot be directly applied on the asphalt layer, an appropriate support is required between the high weather resistance resin layer and the asphalt layer. Is. The aptitude required for the support is
(1) Capable of withstanding heat during reaction curing of the coating film and heat during processing of the cap sheet, (2) not being attacked by the solvent contained in the coating material, (3) winding the cap sheet into a roll. There are no wrinkles when it is in use, (4) it is a reasonable price, and (5) it has the mechanical properties that it will not be damaged during construction, but those that satisfy these aptitudes are: Polyester films such as polyethylene terephthalate and polyolefin films such as polyethylene and polypropylene are preferable. Further, these films are subjected to adhesion improving treatment (anchor treatment) such as corona discharge treatment in order to secure adhesion with a coating film (asphalt in some cases). The thickness of these films is 8 to 100 μ, preferably 12 to 25 μ. By combining the coating film and the film, a reinforcing effect also appears in the coating film itself, and as a result, higher weather resistance and durability can be obtained than in the case of the coating film alone.

It is preferable that the other surface of the support is coated with an easily-adhesive resin for asphalt. Examples thereof include polyurethane (isocyanate reaction-curing type) 100 parts by weight, silica fine powder 20 parts by weight, carbon black 5 parts by weight and the like.

Since the coating film of the high weather resistance resin or its coating material can be easily formed by a coater for packaging printing such as a gravure coater, multicolor printing can be easily carried out if necessary.

When the exposed waterproof asphalt-based cap sheet of the present invention is applied by the asphalt waterproof thermal method, silica is generally used as an adhesion preventive material on the back surface of the cap sheet.
Mineral powder such as silica sand, mica, clay and alumina is sprinkled, but silica and silica sand are particularly preferable.

In order to apply the cap sheet by the self-adhesion method (self-adhesion method), a self-adhesion layer and a release sheet can be provided instead of the mineral powder. The self-adhesion method is more preferable because it does not have a problem of dirt due to hot asphalt and is finished cleanly, so that the aesthetic appearance and design of the cap sheet can be fully utilized. As the asphalt used for the cap sheet, it is more preferable to use the modified asphalt than the blown asphalt because the durability performance and the low temperature and high temperature performance are improved.

The reinforcing material of the cap sheet can be selected from a fibrous sheet made of organic fibers or inorganic fibers, or a plastic film, but if heat resistance and dimensional stability during processing are taken into consideration, a single material such as polyester, vinylon, nylon, polypropylene, etc. Alternatively, a non-woven fabric made of mixed paper is preferable.

[0017]

[Examples] A PET12μ film having corona discharge treated on both sides was coated with a yellow ink A on one side using a gravure coater so that the film thickness after curing would be 10μ. The brown ink B was coated with the pattern shown in FIGS. 1A and 1B so that the film thickness after curing was 7 μm, and both were reactively cured at 100 ° C. for 10 seconds. Ink A mixture Mixture of main agent and curing agent → 15 to 25 wt% [Main agent: Blend of acrylic polyol and vinyl chloride-vinyl acetate copolymer Curing agent: non-yellowing isocyanate polymer (ratio of polyol to isocyanate is 5: 1) ] Inorganic / organic pigment → 5 to 50 wt% Silicon oxide / polyethylene → 0 to 10 wt% Solvent → 15 to 65 wt% Ink B compound Same as other than pigment Next, on the other side of the film Polyurethane (isocyanate reaction curing type) 100 weight 2 parts by weight of silica fine powder 20 parts by weight of carbon black 5 parts by weight of an ink was coated with 2 μm and reaction-cured at 100 ° C. for 2 seconds. The film was laminated to the surface of a self-adhesive modified asphalt roofing. The configuration is shown in FIG. Modified asphalt composition is SBS (TR 1101 manufactured by Shell Chemical) 15 wt% Straight asphalt 180-200 85 wt% Reinforcing material: Polyethylene terephthalate spunbond (100 g / m ² ) Self-adhesive composition is SBS (same as above) 20 wt% Takifire (TU-2101 manufactured by Exxon Chemical Co., Ltd.) 20 wt% Process oil (Machine oil # 30 manufactured by Fuji Kosan) 20 wt% Straight asphalt 180 to 200 40 wt% Cap sheet thickness is 2.5 mm. The weather resistance of the cap sheet is xenon arc type sunshine. Evaluation was performed using a weather meter. 5000h
Even after the elapse of r, no abnormalities such as cracks or remarkable discoloration were observed on the surface. Further, a high weather resistant resin layer alone was formed without using a support and the same evaluation was carried out, but cracks occurred on the surface after 2000 hours.

[0018]

[Effects] According to the present invention, it is possible to provide an asphalt-based cap sheet for non-sanded exposed waterproof, which is excellent in weather resistance and design. In particular, by performing multicolor printing on the high weather resistance resin layer using a high weather resistance resin ink, it is possible to provide a product having an extremely beautiful pattern which is far from the asphalt-based cap sheet used so far.

[Brief description of the drawings]

1A is a cross-sectional view of a support (PET film) having a highly weather resistant resin pattern layer (brown ink A) and a highly weather resistant resin layer (yellow ink B) of Example 1 on the surface. FIG. , B
Is its top view,

FIG. 2 is a cross-sectional view of an exposed waterproof asphalt-based cap sheet of Example 1.

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Takashi Ito 1-3-1, Kodai, Adachi-ku, Tokyo Tajima Roofing Co., Ltd.

Claims (3)

[Claims] 1. High weather resistant resin layer / support /
An asphalt-based cap sheet for exposed waterproofing, comprising an easily-adhesive resin layer / asphalt or modified asphalt layer / reinforcing material / asphalt or modified asphalt layer / adhesion-preventing material. 2. The asphalt-based cap sheet for exposed waterproofing according to claim 1, wherein a self-adhesive layer / release sheet is provided instead of the anti-adhesive material. 3. The exposed and waterproof asphalt-based cap sheet according to claim 1, wherein the highly weather resistant resin layer is a colored layer, and a highly weather resistant resin pattern layer is provided thereon.