JPH0372149A - Insulation sheet for film waterproofing and film waterproofing work using the same sheet - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an insulating sheet used in a roof waterproofing method for buildings such as concrete buildings. Specifically, the present invention relates to an insulating sheet used in a waterproofing method using a waterproofing film, that is, an insulating sheet related to a waterproofing method that combines sheet waterproofing and waterproofing a coating.

(Prior Art and Issues) Various waterproofing methods are applied to the rooftops of buildings such as concrete buildings in order to prevent water leakage, such as rainwater.

This waterproofing method is roughly classified according to the type of waterproof layer and is carried out by the following methods.

1) Asphalt waterproofing method 2) Sheet waterproofing method 3) Paint film waterproofing method Among these, the construction method in which the insulating sheet of the present invention is involved is the paint film waterproofing method. 5) Apply or spray a liquid material based on polymeric material, rubber, asphalt, etc. with a brush, trowel, etc. to form a waterproof layer of the required thickness to make it waterproof. It is a construction method.

In general, the waterproof layer needs to be adhered to the waterproof base in some way to prevent it from peeling off due to the effects of wind, etc., but in the past, the method of adhesion was to adhere the waterproof layer completely to the waterproof base. Close contact method was used exclusively. This method has the advantage of being easy to tighten and finish during construction, but on the other hand, water in the waterproofing base evaporates and accumulates between the waterproofing layer and the waterproofing layer, resulting in bulges in some parts of the waterproofing layer. Or,
In addition, there have been drawbacks such as low resistance to breakage due to cracks in the waterproof base and movement. In order to overcome this drawback,
In recent years, ``insulation method'' has been introduced that does not completely bond the waterproof layer to the waterproof base.
(also called partial contact construction method) has come to be practiced.

In this insulation construction method, the waterproof layer and the waterproof base are not integrated, but are separate layers, and the two layers are partially glued together, allowing water vapor to move freely in the non-bonded areas. Because the force generated between the layer and the base can be dispersed over a large area, it has the characteristic of reducing blisters and cracks in the waterproof layer. A sheet installed between a waterproof base and a waterproof layer for this purpose is called an "insulating sheet." Among these insulating sheets, the sheet of the present invention is particularly suitable for the coating film waterproofing method.

A long-established insulation construction method is exclusively used for asphalt waterproofing, in which a perforated roofing is laid on a waterproof base, melted asphalt is poured over the roofing, and waterproofing is carried out in the openings of the roofing. This is a method of bonding the base and asphalt. In this case, the roofing is completely ligated. Furthermore, a method has been proposed (Japanese Unexamined Patent Publication No. 55-165858) in which a hexagonal-shaped communication groove is formed on the back side of a polyethylene foam sheet, and a waterproof sheet reinforced with a chemical fiber mesh is applied with a primer and then fixed. As a similar method, a waterproof sheet (Japanese Patent Publication No. 61-41738, Japanese Patent Publication No. 59-129
122) has also been proposed. These serve as both a waterproof sheet and an insulating sheet.

Furthermore, the inventors of the present application heated the surface of an asphalt sheet with a perforated sheet laminated on the back side using a torch (flame).
They have proposed a construction method (Japanese Patent Application No. 120002/1983) in which the material is melted and bonded to the waterproof sheet on the top surface, and then to the waterproof base at the openings in the perforated sheet on the back surface. Separately, the inventor of the present invention has applied for a self-adhesive insulating sheet and construction method in which a perforated sheet is laminated on oil-containing rubber/asphalt (pending application).

All of these are construction methods or sheets for insulating a waterproof layer from a waterproof base, and no consideration has been given to further applying a waterproof coating on top of these sheets. The insulating sheet is originally a link between the waterproof base and the waterproof layer, so it is necessary to devise ways to integrate it with the upper waterproof layer.

That is, for example, even if an attempt is made to form a urethane coating on an asphalt surface, it is impossible to do so as it is. This is because asphalt and urethane do not bond together unless some kind of adhesive is used.

(Means for Solving the Problems) In view of the above situation, the insulating sheet proposed by the present inventor is an asphalt-based insulating sheet, which itself also serves as a waterproof sheet, and furthermore, a coating film waterproofing method is applied on the sheet. This is a sheet for which special considerations have been made to further apply a waterproof layer, and it is also characterized by being easy to manufacture.

The insulating sheet of the present invention is an insulating sheet for coating waterproofing, which is formed by laminating a thermoplastic resin sheet or film and a fibrous sheet in this order on the upper surface of an insulating asphalt sheet.

A perforated sheet or film can be laminated on the back side of the insulating sheet for insulation from the waterproof base. the result,
The insulating sheet is bonded to the waterproof base only at the perforated portions of the perforated sheet or film, and the other portions are insulated from the waterproof base, thereby functioning as an insulating sheet. Moreover, since the asphalt sheet used in the present invention is waterproof itself, it also functions as a waterproof sheet.

As the asphalt for this asphalt sheet, straight asphalt, blown asphalt, or a mixture thereof can be used.

Preferably, it is a so-called rubber asphalt containing rubber to improve adhesion and low-temperature properties. More preferably, 10-10 parts by weight of rubber per 100 parts by weight of asphalt.
0 parts by weight and 10-100 parts by weight of tackifier.

Rubber is natural rubber, 5BR (styrene butadiene rubber),
Synthetic rubbers such as butyl rubber, SBS (styrene-butadiene-styrene block copolymer) or recycled rubber thereof, crosslinked or vulcanized rubber powder, ethylene copolymer, and atactic polypropylene can be used alone or in combination. Rubber is blended to improve the adhesion of asphalt and its plasticity at low temperatures, and its blending ratio is 10-1 to 100 parts by weight of asphalt.
00 parts by weight is appropriate. When the amount is less than this, the adhesion and adhesion retention are poor, and when it is more than this, the performance is sufficient but it becomes expensive and uneconomical.

Any tackifier may be used as long as it can impart tackiness to asphalt when blended with the asphalt. For example, rosin resins, petroleum resins, and non-volatile oils such as polybutene, rubber compounding oils, high boiling hydrocarbon oils, etc. can generally be used. The appropriate mixing ratio is 10-100 parts by weight per 100 parts by weight of asphalt. If the amount is less than 10 parts by weight, the development of tackiness will be insufficient, and if it exceeds 100 parts by weight, the sheet will be too flexible and its moldability will deteriorate.

The layer consisting of a thermoplastic resin sheet or film and a fibrous sheet laminated on top of the asphalt sheet is a specially devised part for the waterproof layer applied on the insulating sheet. It is particularly important to laminate the fibrous layer through the fibrous layer.

The waterproof layer applied for these two layers firmly adheres to the insulating sheet, and the black color of the asphalt does not bleed onto the surface of the waterproof layer, making it easy to manufacture the insulating sheet. .

The thermoplastic resin sheet or film laminated between the fibrous layer and the asphalt layer has the effect of preventing low molecular weight components in the asphalt sheet from bleeding onto the surface of the fibrous layer. The thermoplastic resin sheet or film is a sheet or film made of thermoplastic resin such as polyethylene or polypropylene, and its thickness can be freely selected within a range that exhibits the effect. Usually, the thickness is about 5 to 100 microns because the effect can be sufficiently exhibited even if it is relatively thin.

When the low molecular weight components in the asphalt bleed onto the surface of the fibrous sheet, firstly the adhesion with the upper waterproof layer is impaired, and secondly,
There is a danger that it will melt into the resin of the upper waterproof layer, turning the waterproof layer black and impairing its aesthetic appearance, and furthermore, changing the physical properties of the upper waterproof layer. This is not the only effect of this thermoplastic resin layer. During the production of an insulating sheet, when the insulating sheet is shaped using a rotating roll, if low molecular weight components ooze out, the rotating roll becomes dirty, which increases manufacturing costs. By laminating a thermoplastic resin sheet or film between a fibrous sheet and asphalt, the drawbacks of these asphalt-based sheets are compensated for.

The top layer fibrous sheet is a sheet formed by fine fibers intertwined vertically. Specifically, both woven fabrics and non-woven fabrics can be used, but non-woven fabrics are preferred from the viewpoint of cost. In particular, nonwoven fabrics such as polyester and polypropylene are preferred, and among them, polyester nonwoven fabrics are particularly preferred from the viewpoint of weather resistance and heat resistance. In the case of a non-woven fabric, its thickness can be selected as appropriate from the range of 0.1-5 mm5 and a basis weight of 10-500 g/m.

This fibrous layer intertwines with the resin of the coating film waterproof layer applied on top, and has the effect of strengthening the adhesion of the waterproof layer. Most of the resins used in the waterproof coating method are urethane-based resins, and these resins have the disadvantage of easily peeling off when applied directly to a thermoplastic resin layer such as asphalt or polyethylene. This drawback can be compensated for by laminating fibrous layers.

In addition, since it is fibrous, when it is laminated with a thermoplastic resin in the lower layer by a thermocompression method, it is preferable because it will bond well with the thermoplastic phase resin.

Furthermore, as mentioned above, since the insulating sheet of the present invention has a waterproof effect, it enhances the waterproof property together with the upper surface coating resin, and has the effect that at least the upper waterproof coating can be made thinner due to the lower waterproofing properties of the present invention. This not only reduces the amount of expensive paint film waterproofing resin used, but also reduces the number of painting steps.

That is, with waterproof coating, it is difficult to form a necessary film thickness in one coating, and usually multiple coatings are applied. In particular, with the urethane coating waterproofing method, it is not possible to apply thick coatings because the urethane foams when it hardens.For this reason, with conventional waterproofing using only a urethane coating, it is necessary to apply thin coats in multiple coats. Since the work was carried out at the construction site itself, the labor involved could not be ignored. Therefore, reducing the film thickness means reducing the number of times of coating, which has an extremely large economic effect.

The perforated sheet or film laminated on the back side of the asphalt sheet may be a thermoplastic resin film such as polyethylene film or polyester film, or a nonwoven fabric such as a nonwoven fabric made of polyester fiber, or a nonwoven fabric lined with a thermoplastic resin film, or synthetic paper. etc. are suitable, and those with circular holes of 20 mm to 100 mm in diameter are used.

In the embodiment of the present invention, the hole is not limited to a circular shape, but in view of the fact that the die shape that can be most easily processed with a cut die of a drilling machine is a circular die, the hole is generally circular. Even if the hole is square, pentagonal, or hexagonal with the above-mentioned dimensions, there is no problem and it does not depart from the scope of the present invention.

The insulating sheet of the present invention is an insulating sheet for waterproofing paint films as described above, but it can also be used as an insulating sheet for waterproofing urethane paint films because it exhibits particularly excellent effects on waterproofing urethane paint films. Urethane resin usually does not adhere strongly to asphalt sheets,
It was difficult to apply waterproof coating on asphalt sheets, but
Since the asphalt-based insulating sheet of the present invention is easily adhered, it has become possible to apply urethane waterproof coating. Furthermore, due to the nature of the resin, urethane waterproofing has a thin coating film and requires a large number of coating steps to achieve the desired film thickness.However, since the insulating sheet of the present invention also has a waterproofing function, the urethane waterproofing coating is thin. It is especially effective for urethane waterproofing methods, as it can reduce the number of times of painting.

The present invention is also characterized in that an insulating asphalt sheet formed by laminating a thermoplastic resin sheet and a fibrous sheet in this order on the upper surface is adhered to a waterproof base, and the upper surface of the insulating asphalt sheet is waterproofed with a coating film. It is also a coating film waterproofing method. The coating film waterproofing method of the present invention is particularly effective in the urethane coating waterproofing method.

The insulating asphalt sheet used here is exactly the same as the insulating sheet for coating waterproofing that has been explained so far.

The waterproofing method using the sheet of the present invention involves cleaning the waterproof base such as the roof of a building, drying the moisture, and then applying a thin and uniform primer such as asphalt emulsion by brushing or spraying. After the primer has dried, apply more adhesive if necessary and lay out the insulating sheet with the perforated sheet side down. After applying light pressure with a roller to fully adhere the insulating sheet, mix a urethane resin for painting, etc., and apply the resin for painting evenly directly onto the top of the fibrous sheet using methods such as a trowel, brush, or spraying. do. The coating thickness varies depending on the type of coating resin, the purpose of coating, etc., and is applied once or in several coats as appropriate depending on each waterproof coating process.

(Example) The present invention will be explained in further detail by the following examples.

(Example of asphalt mixture) Straight asphalt 100 weight ff1ffi, SBS
Copolymer (Califlex TR1102 manufactured by Shell Chemical)
2C1fi parts, 50 parts by weight of atactic polypropylene and aromatic hydrocarbon oil (Colamo Rexfu 00)
(manufactured by Nippon Oil Co., Ltd.) was blended to prepare asphalt for insulation sheets. The properties of this asphalt were as shown in Table 1.

Table 1 Test items Test conditions Measured values Test method Softening point Ring and ball method 132 CJISK-2207 needle strength 1/l
O■■ 78 Same as above 5G Penetration index -l007 Same as above Sagging length mm O Same as above Actual 1-LL Polyester non-woven fabric with thickness 0.3 mm (Weight 80 g/
A laminate sheet was prepared by heat-sealing a polyethylene film with a thickness of 30 μm to a 30 μm thick polyethylene film (manufactured by Toyobo Co., Ltd.).

Separately, make a 100mm hole with a thickness of 0.1mm and a hole diameter of 30mmφ.
A polyethylene sheet with holes arranged in a houndstooth pattern was prepared, and a release paper was layered on top of this. As shown in FIG. 2, the perforated polyethylene sheet (including release paper) 3, polyester nonwoven fabric and polyethylene laminated sheet 4 are sandwiched between rotating rolls 1 and 2, with the polyethylene side facing inward, and between the two sheets. Step 5: Melt the asphalt shown in the above asphalt preparation example and pour it into the film while adjusting the distance between rolls 1 and 2 to a thickness of 1 to 4 mm.The rolls are rotated to coat both sides of the asphalt with polyester nonwoven fabric and polyethylene. A 4-layer laminate sheet consisting of a laminate sheet and a perforated polyethylene sheet (57I x 6 including the 1mm pattern) was cooled and rolled up to obtain an insulating sheet as shown in Figure 1.The roll surface was covered with asphalt. No contamination was observed.

1 piece [and the insulation sheet of Example 1 400mm x 400mm x 80mm]
The perforated sheet was glued onto the bottom side of a slate board with a thickness of 1.0 mm using a plane asphalt primer, and urethane waterproofing paint (Cosmoflex R sold by Sumitomo Chemical (a-) and manufactured by Saito Co., Ltd.) was brushed on the surface. The average film thickness is 1m.
It was applied so that the thickness was m. After 30 minutes, I cut a 25mm wide groove on the coated surface using a cutter knife, attached a handle to the edge with adhesive, and lifted it in the 900 direction. As a result, the urethane coating layer did not come off at all, and I lifted it even harder. The situation was such that there was separation between the waterproof base and the insulation sheet.

That is, at least the adhesive strength of the urethane coating layer was greater than the adhesive strength between the waterproof base layer and the insulating sheet.

Hiki 30 - The test of Example 2 was repeated using the same insulating sheet as Example 1 except that the nonwoven fabric was not laminated. The urethane coating layer was peeled off without applying any force.

The test of Example 2 was repeated using the insulating sheet of Example 1 whose upper surface was made of asphalt without laminating the nonwoven fabric or polyethylene film. As in Comparative Example 1, the film was easily peeled off.

An insulating sheet was produced in the same manner as in Example 1, except that the 30 μm polyethylene film was not used. As a result, black stains began to appear on the surface of the rotating roll when the laminated sheet was rolled for about 7 m, and by the time the laminate sheet was rolled for about 18 m, the smudges from the rotating roll were transferred to the surface of the nonwoven fabric, and the asphalt that had oozed from the bottom surface appeared on the surface. The whole thing turned black and dirty.

(Effects of the Invention) The insulating sheet of the present invention is based on an inexpensive asphalt-based sheet, which itself also serves as a waterproof sheet. As a result of this consideration, the waterproof coating film can be firmly bonded, and furthermore, it is easy to manufacture.

As mentioned above, the insulating sheet of the present invention is an insulating sheet for coating waterproofing, which is made by laminating a thermoplastic resin sheet or film and a fibrous sheet in this order on the top surface of an asphalt sheet, and the waterproofing coating is a urethane coating waterproofing. The effect is particularly great in some cases.

A perforated sheet or film can be laminated on the back side of the insulating sheet. As a result, the asphalt sheet adheres to the waterproof base only in the perforated sheet on the back side or in the apertures of the IT film, and the other parts are insulated from the waterproof base, thereby functioning as an insulating sheet. By laminating a fibrous layer on the top surface of the asphalt sheet via a thermoplastic resin layer, the waterproof layer applied to the top surface firmly adheres to the insulation sheet, and the black color of the asphalt is similar to that of the top waterproof layer. It does not bleed onto the surface and impair its appearance, the oozed asphalt does not impair the adhesion of the cloth surface, and there is no need to worry about changing the physical properties of the upper waterproof layer. Furthermore, there is no chance of staining the roll surface or staining the cloth surface during manufacturing.

Furthermore, since the insulating sheet of the present invention has a waterproofing effect by itself, it has the effect of increasing the waterproofness together with the top coating resin and making it possible to thin the top waterproof coating. This not only reduces the amount of expensive paint film waterproofing resin used, but also reduces the number of painting steps in the waterproofing method. That is, with waterproof coating, it is difficult to form a necessary film thickness in one coating, and usually multiple coatings are applied. therefore,
Being able to reduce the film thickness leads to a reduction in the number of times of painting, which has an extremely large economic effect.

[Brief explanation of drawings]

FIG. 1 is a plan view of the insulating sheet of the present invention. A is a lower perforated sheet with a portion of the upper JiIB cut out. FIG. 2 shows a method for manufacturing an insulating sheet according to the present invention.

Claims (1)

[Claims] 1) An insulating sheet for coating waterproofing, which is formed by laminating a thermoplastic resin sheet or film and a fibrous sheet in this order on the upper surface of an insulating asphalt sheet. 2) The insulating sheet for waterproofing a coating according to claim 1, wherein the waterproofing coating is a urethane coating. 3) The insulating sheet for coating waterproofing according to claim 1, wherein a perforated sheet or film is laminated on the back surface. 4) An insulating asphalt sheet formed by laminating a thermoplastic resin sheet or film and a fibrous sheet in this order on the upper surface is adhered to a waterproof base, and then the upper surface of the insulating asphalt sheet is waterproofed with a coating film. Paint film waterproofing method. 5) The coating film waterproofing method according to claim 4, wherein the coating film waterproofing is a urethane coating waterproofing. 6) The coating film waterproofing method according to claim 4, wherein the insulating asphalt sheet is an insulating sheet further laminated with a perforated sheet or film on the back surface in contact with the waterproof base.