JPH04350245A - Waterproof sheet and autohesion waterproof construction method using the same - Google Patents

Abstract

PURPOSE:To facilitate construction and reduce the quantity of the separating paper by using a waterproof sheet having a self-adhesive layer and the separat ing paper only on the lower side of a backing layer, and sticking the second- layer waterproof layer on the first-layer waterproof layer. CONSTITUTION:An asphalt layer 3, a plastic film layer 2 and a nonslippery paint film layer 1 are laminated on the upper face of a backing layer 4, and the asphalt layer 3, a self-adhesive layer 5 and the separating paper 6 are laminated on the lower face to constitute the first-layer waterproof sheet. The waterproof sheets are overlapped in sequence and continuously integrated to form the first-layer waterproof layer while the separating paper is removed and the self-adhesive layer 5 is stuck to the backing. The second-layer waterproof sheets with the same structure as the first-layer waterproof sheet are overlapped in sequence and continuously integrated to form the second-layer waterproof layer while the separating paper 6 is removed and the self-adhesive layer 5 is stuck to the first-layer waterproof layer.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-adhesive waterproofing method using a waterproof sheet made of asphalt or modified asphalt in waterproofing work for buildings.

0002

[Prior Art] In waterproofing work for buildings, high-temperature asphalt melted at the construction site is used as an adhesive.
BACKGROUND ART The so-called asphalt waterproofing thermal construction method, in which a plurality of asphalt waterproof sheets, so-called asphalt roofing, are laminated to form a waterproof layer has been widely used as the mainstream of waterproofing work.

[0003] This construction method has extremely high waterproof reliability;
Even today, it accounts for the majority of all waterproofing work. However, this method has the disadvantage that when melting the asphalt, a large amount of smoke and odor from the molten asphalt is generated, which significantly pollutes the surrounding environment, so it is avoided in densely populated areas and urban centers, and is not adopted. Areas tend to be limited. Moreover, in order to handle high-temperature asphalt during work,
This is especially disliked by young people because it poses a risk of burns to workers and stains their clothes, and as a result, there is a chronic shortage of workers.

On the other hand, so-called sheet waterproofing, in which rubber or plastic sheets are pasted with adhesive without using molten asphalt at all, is widely used at construction sites, but in most cases waterproofing is achieved with just one sheet. Since it is a one-layer waterproofing system that forms layers, it is far behind the asphalt waterproofing thermal method in terms of waterproofing reliability.

Against this background, users have strongly desired the emergence of an asphalt-based waterproofing method that does not use molten asphalt at all during construction and has high reliability. One solution that has been put on the market as a countermeasure is the so-called self-adhesive waterproofing method in which a waterproof layer is formed using a waterproof sheet made of asphalt or modified asphalt provided with a self-adhesive layer. This construction method appeared on the market about 20 years ago, and has become increasingly popular especially in recent years, and is gradually establishing its presence as a construction method among various waterproof construction methods. To explain this construction method in detail, in order to improve its waterproof reliability, two waterproof sheets are usually stacked to form a two-layer waterproof layer.

[0006] As the first layer, a self-adhesive layer 5 is provided on both sides.
Next, a waterproof sheet with a double-sided self-adhesive layer (see Fig. 4) in which a release paper 6 is laminated, and the second layer is a single-sided self-adhesive layer in which a self-adhesive layer 5 and a release paper 6 are laminated on one side. Use a waterproof sheet (see Figure 5). All waterproof sheets have a self-adhesive layer and a laminated layer of release paper, and there are various types of waterproof sheets with different laminated structures and compositions. As for the installation method, first, remove the release paper from the first layer of waterproof sheet and attach it to the base.

[0007] The waterproof sheets are joined by laminating the self-adhesive layers together while splicing them. Next, the second
Place the release paper surface of the waterproof sheet used as the second layer to face the first waterproof layer, and remove both the release paper left on the surface of the first waterproof layer and the release paper of the second layer waterproof sheet. A second waterproof sheet is attached to the first waterproof layer using the self-adhesive layer to form a laminated waterproof layer.

[0008] Particularly problematic points in this case will be explained in detail below. 1. The following work is extremely complicated and time-consuming. ■Joining the first layer of waterproof sheets: As mentioned above, since the self-adhesive layers are joined together while overlapping each other, the release paper must be removed from each corresponding part. Moreover, unfortunately, there are many cases where the release paper is partially left at the joint and the joints are overlapped, resulting in a water leakage accident.

[0009] Processing work at the end of the tarpaulin sheet when the first layer waterproofing construction is interrupted: If the work has to be interrupted due to rain or some other circumstances during the first layer waterproofing construction, the work from the end part of the tarpaulin sheet Treatment to prevent rainwater from entering, so-called rain curing treatment, is required. Normally, sealing is done by sealing with a sealant or melting the waterproof sheet by heating it with a burner, but the release paper must be removed from the surface of the waterproof layer in advance to the extent that it does not interfere with these operations. .

■Work of attaching the first waterproof layer and the second waterproof sheet to each other with their self-adhesive layers while removing each other's release paper: In this case, the first waterproof layer and the second waterproof sheet are pasted together with their self-adhesive layers. If the surface release paper is removed first, workers will not be able to walk on it, and furthermore, when installing the second layer waterproof sheet, the release paper of the second layer waterproof sheet will overlap the first layer waterproof layer. It sticks to the self-adhesive layer on the surface. Therefore, it is necessary to remove the first layer and the second layer of release paper together while pasting them together, resulting in a significant decrease in work efficiency.

2. The amount of release paper generated as waste material is extremely large. Release paper is generated as waste material at a ratio of 3 parts for every 1 part building area to be waterproofed, and construction companies are currently having a hard time disposing of it.At the same time, it is also a big problem from the perspective of saving earth's resources. It becomes.

[0012] To summarize the above problems, the first layer and the second layer
The point is that the layers are adhered to each other using self-adhesive layers. Nevertheless, as mentioned above, the fact that this construction method is becoming popular is that the biggest advantage of this construction method, which is that it is a non-polluting construction method, is well suited to the current social environment and needs and is highly evaluated. This is thought to be due to the presence of Therefore, it is very useful and urgent to broadly solve the problems of this construction method.

[0013]

[Objective] The object of the present invention is to provide a new waterproof sheet or roofing material that contains an asphalt layer but uses a self-adhesive layer and release paper only on one side, and The purpose of this invention is to provide a self-adhesive waterproofing method in which the first layer of waterproofing layer is formed by using a self-adhesive waterproofing method, thereby broadly solving the problems of the prior art due to the fact that the prior art has release paper on both sides. It is something.

[0014]

[Means for Solving the Problems] The first aspect of the present invention is to provide an asphalt layer, a plastic film layer, and a non-slip thin layer on the upper surface of a base material, and an asphalt layer, a self-adhesive layer (hereinafter referred to as The present invention relates to a waterproof sheet or roofing material characterized by laminating a self-adhesive layer) and a release layer, respectively.

The second aspect of the present invention is (a) removing the release layer of the waterproof sheet, attaching the self-adhesive layer to the base, and successively integrating the waterproof sheet by overlapping and splicing to form the first waterproof layer. After forming, (b) a second layer waterproof sheet having a self-adhesive layer and a release layer on the back side, and affixing the self-adhesive layer on the first waterproof layer while removing the release layer, The present invention relates to a self-adhesive waterproofing method characterized in that a second waterproof layer is formed by sequentially overlapping and joining together to form a second waterproof layer.

[0016] As the plastic film that is the layer forming material for the first layer of waterproof sheet, general-purpose plastic films such as polyolefin, acrylic resin, and polyester can be used, but if cost is taken into account, stretched or unstretched polyolefin can be used. Film is preferred. Further, the thickness is preferably about 8 to 30 microns, since appropriate mechanical properties are required to avoid damage during construction.

Furthermore, if the plastic film contains a large amount of plasticizer or softener, such as soft polyvinyl chloride, these will bleed out later, resulting in poor adhesion to the asphalt composition on the back of the plastic film, and problems with the surface of the plastic film. It is best to avoid this as it may dramatically reduce the adhesion with the non-slip coating layer.

Next, the non-slip thin film to be laminated on the surface of the plastic film is usually formed by painting, and will be hereinafter referred to as a non-slip coating layer, and will be described in detail. The reason for providing this coating layer is that if the surface to be waterproofed is almost horizontal or has a very gentle slope, there is no problem, but if the slope is large (especially in recent buildings, the roof is also actively considered as part of the design). Sloped roofs are becoming more common in order to expose workers to public view), creating a risk for workers to slip and fall.

From this point of view, the waterproof sheet of the present invention is also extremely effective for use as roof underlaying material. In this case, the roof is completed by layering roof surface finishing materials (tiles, slate, metal plates, asphalt shingles, etc.) on top of the roof underlayment.

[0020] If the plastic film is exposed as it is on the surface, it will be extremely slippery and very dangerous. In order to obtain a non-slip coating layer, it is effective to mix fine powder into a general-purpose rigid resin paint to impart non-slip properties. As the fine particles, fine mineral powder or plastic beads can be used. As the synthetic resin paint, polyurethane, polyester, polyamide, acrylic resin, copolymer of ethylene and vinyl acetate, etc. can be used. Silica, silica sand, mica, clay, alumina, etc. are used as the fine mineral powder. As the plastic beads, any plastic beads such as polystyrene can be used.

Among these fine mineral powders, silica is particularly preferred in view of non-slip hardening, dispersibility into synthetic resin paints, and cost. If the particle size is too small, it will be difficult to obtain anti-slip properties, and if it is too coarse, it will be difficult to coat the plastic film, so generally, the particle size is 0.1~
Preferably, the particle size is about 10 μm. In the case of plastic beads, those with a spherical diameter of 5 to 30 μm are preferable. The composition of a suitable synthetic resin paint is 50 to 80 parts by weight, preferably 70 to 75 parts by weight of a solvent per 100 parts by weight of synthetic resin.
Parts by weight, 3 to 25 parts by weight of fine particles, preferably 5 to 10 parts by weight
parts by weight, dark colorant, e.g. carbon black 3-20
Parts by weight, preferably 5 to 10 parts by weight.

[0022] Furthermore, the non-slip coating layer must be resistant to the effects of rainwater or sunlight even if it is exposed outdoors for a while, and must be able to firmly adhere to the plastic film surface and not easily peel off. Therefore, for synthetic resin paints, it is more preferable to use a reaction curing type using a main agent and a curing agent than to form a film by drying with a solvent, as this type adheres firmly to the plastic film surface and provides a film with excellent durability.

Considering these, among the synthetic resin paints mentioned above, one of polyurethane, polyester, and polyamide paints is suitable.
Liquid or two-liquid reaction curing types are economical and easy to use.

Next, regarding the adhesion between the non-slip coating layer made of these synthetic resin paints and fine particles and the self-adhesive layer, the self-adhesive layer generally adheres to the adherend with its tackiness. Since it is a material, its adhesion is not so affected by the material of the adherend, and it adheres well to and integrates with the synthetic resin paints shown as examples.

[0025] Particularly in this case, since the fine particles are added, the surface of the non-slip coating layer is in a considerably rough state from a microscopic point of view, and furthermore, the contact area with the self-adhesive layer surface is very rough. The anchor effect is easily expressed, and it shows good "wetting" to the self-adhesive layer surface. As for the thickness of the non-slip coating layer, applying the coating in an amount of about 3 to 10 g per square meter will provide sufficient performance.

Next, as mentioned above, the first layer waterproof sheet is often left exposed with its surface exposed for several days to a month in some cases. In that case, the plastic film will very easily peel off at the bonding interface with the asphalt composition layer on the back surface within a few days after being exposed. Of course, before exposure, the bonded interface was firmly adhered.

[0027] This is because sunlight passes through the non-slip coating layer and the plastic film and deteriorates the interface of the asphalt layer, resulting in a significant decrease in the adhesive force between the plastic film surface and the asphalt layer surface. to cause. In order to avoid this phenomenon, the inventors tried actively adding ultraviolet absorbers to plastic films and non-slip coating layers, but no significant improvement effect was observed.

However, it has been found that this problem can be solved by blocking sunlight, and in the present invention, a dark coloring agent is used for the purpose of blocking sunlight. Therefore, the addition of a deep coloring agent, especially a black coloring agent such as carbon black, to the non-slip coating layer and/or the plastic film has a great effect. The amount of the dark colorant such as carbon black added is preferably about 5 to 20 parts by weight per 100 parts by weight of the non-slip coating layer or plastic film.

There are no particular restrictions on the laminated structure, composition, etc. of the main body waterproof sheet as long as the second layer waterproof sheet has a self-adhesive layer and a release layer on its back surface.

An example of the laminated structure of the second layer waterproof sheet is as follows: (a) an asphalt layer having mineral fine powder on the surface, a synthetic fiber nonwoven fabric layer as a base material, an asphalt layer,
A waterproof sheet consisting of a rubber-modified asphalt layer (self-adhesive layer) and a release paper layer,

(b) Waterproof sheets include an asphalt layer having sand grains on the surface, a synthetic fiber nonwoven fabric layer as a base material, an asphalt layer, a rubber-modified asphalt layer (self-adhesive layer), and a release paper layer.

However, in order to use the roof for various purposes after the waterproofing work is completed, a method of pouring concrete on top of the waterproof layer is widely used. In that case, a plastic film for curing is usually laid on top of the waterproof layer to prevent damage to the waterproof layer during concrete pouring, but in the present invention, a waterproof sheet with the same structure as the first layer is When used as a layer, a curing film becomes unnecessary, which is preferable in terms of cost and work efficiency. The plastic film used for the second layer waterproof sheet is preferably thicker than that used for the first layer, and preferably has better alkaline water resistance. In particular, a polypropylene or polyethylene film with a thickness of about 30 to 100 μm is good.

[0033] As the asphalt layer, asphalt or various modified asphalts can be used.

[0034] The base material layer may be any base material such as cloth, nonwoven fabric, or film, and examples thereof include woven fabrics or nonwoven fabrics made of natural fibers or synthetic fibers, or plastic films. The release layer is usually made of release paper, but any material that has no affinity with the self-adhesive layer can be used.

The layer structure of the first layer waterproof sheet is shown in FIG. In the figure, 1 is a non-slip coating layer, 2 is a plastic film layer, 3 is an asphalt layer, 4 is a base layer, 5 is an asphalt layer, and 6 is a release layer.

[0036]

【Example】

Non-slip coating layer: Application amount per square meter
3g
Composition Polyurethane 100
Weight part
(Isocyanate reaction curing type)
Silica fine powder powder 20 parts by weight
Carbon black
5 parts by weight

Plastic film: oriented polypropylene
12μ Asphalt composition layer component: SBS*1
15 parts by weight
asphalt
65 parts by weight
Tackifier *2
10 parts by weight
Process oil 10 parts by weight*1; SBS is a styrene-butadiene block copolymer. *2; The tackifier is a polymer or copolymer of C5 and/or C9 unsaturated fractions.

FIG. 2 shows the layer structure of the second layer waterproof sheet used in this example. 7 is mineral powder, and layers 3, 4, 5, and 6 are the same as the first layer of the waterproof sheet. As the plastic film layer of Tazushi 2, stretched polypropylene (
80μ) was used.

1 regarding the non-slip coating layer in this example
．． Friction coefficient 2. Adhesion with self-adhesive layer 3. The measurement results for ultraviolet transmittance are shown below.

1. Friction coefficient (wet)
This example
Polypropylene film surface
Static friction coefficient 1.2
0.4 Generally, it is said that if the coefficient of friction is 0.8 or more, it is quite difficult to slip. In the case of this example, this value is greatly exceeded, and it can be said that it is extremely non-slip.

2. Adhesion test method with self-adhesive layer: T
Mold peel test speed 100mm/min Test temperature
0℃ Non-slip coating layer surface/self-adhesive layer: Cohesive failure of self-adhesive layer at 2.0Kg/inch Plastic film surface/self-adhesive layer: 0.8K
Interfacial peeling between the self-adhesive layer and the film surface at g/inch Self-adhesive layer/self-adhesive layer: Adhesion between the self-adhesive layer and the non-slip coating layer surface as more than cohesive failure of the self-adhesive layer at 2.1 kg/inch The quality is good.

3. UV transmittance (%)
This example: Transparent plastic film 3
50nm 0
90 400nm
0 89 In the case of this example, it can be seen that almost 100% of sunlight is blocked.

[0043]

[Effects] The present invention achieves the following effects by using the waterproof sheet having the above-mentioned specific structure as the first layer in the self-adhesive waterproofing method. Construction is now easy and convenient, work efficiency is significantly improved, and 2. The waterproof sheet joints can now be easily and reliably integrated. 3.
Furthermore, the amount of release paper generated as waste material is reduced by approximately 30% compared to conventional methods.
% reduction, making the process easier. As mentioned above, it has become possible to broadly resolve the problems of conventional self-adhesive construction methods,
Economically, it has become possible to do this at a lower cost. Also,
The roofing material according to the invention does not slip at all even on steep slopes, making it extremely safe to work with.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a first layer waterproof sheet used in the present invention.

FIG. 2 is a sectional view of an example of a second layer waterproof sheet.

FIG. 3 is a sectional view showing an example of a waterproof layer formed by the self-adhesive method of the present invention.

FIG. 4 is a sectional view of a conventional first layer waterproof sheet.

FIG. 5 is a sectional view of a conventional second-layer waterproof sheet.

[Explanation of symbols]

1 Non-slip coating layer 2 Plastic film layer 3 Asphalt layer 4 Base material layer 5 Self-adhesive layer 6 Release paper 7 Mineral powder 8 First layer waterproof layer 9 Second layer waterproof layer

Claims (4)

[Claims] Claim 1: An asphalt layer, a plastic film layer, and a non-slip thin layer are provided on the upper surface of the base material, and an asphalt layer and a self-adhesive layer (hereinafter abbreviated as self-adhesive layer) are provided on the lower surface of the base material.
A waterproof sheet or roof underlaying material characterized by laminating a peeling layer and a peeling layer. 2. The waterproof sheet or roofing material according to claim 1, wherein the non-slip thin layer and/or the plastic film layer contains a dark coloring agent or a dark coloring agent and fine particles. [Claim 3] (a) The waterproof sheet (first layer waterproof sheet) according to claim 1 or 2 is adhered to a self-adhesive layer on a base while removing the peeling layer, and is successively spliced by layering. After integrating to form the first waterproof layer, (b) the second layer waterproof sheet having a self-adhesive layer and a release layer on the back side, and while removing the release layer, add the self-adhesive layer to the first layer. A self-adhesive waterproofing method that is characterized by pasting on top of the waterproof layer and sequentially overlapping and joining to form a second waterproof layer. Claim 4: The second layer waterproof sheet comprises claim 1.
The self-adhesive waterproofing method according to claim 3, wherein the waterproof sheet according to claim 2 is used.