JP3132789B2 - Roof tarpaulin - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproof sheet for a roof. In more detail, when building a house, it is easy to apply a roof tarpaulin on the roof shingle, prevent water from entering through the gaps in the tiles after building, and allow the moisture inside the roof to escape to the outside The present invention relates to a waterproof sheet for a roof suitable for preventing corrosion of an attic.

[0002]

2. Description of the Related Art When building a tiled roof, a waterproof sheet such as oil-impregnated paper (asphalt felt) or waterproof paper is usually attached to the roof to prevent corrosion of the roof shingle due to intrusion of moisture from the outside or inside. The construction method of sandwiching between plates is adopted.

[0003] However, when a roof tile is used, particularly when a roof tile is used, a waterproof sheet is pierced by the nail, and a nail is punched into the roof tile and fixed to the roof shingle. There was a problem that moisture could enter the interior of the roof through the gap between the torn parts. In addition, the waterproof sheet itself does not have water vapor permeability, and moisture entering from the outside or moisture from the inside of the roof can not escape through the waterproof sheet, so that even if a waterproof sheet is used, the roof shingle corrodes. There was a problem.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a waterproofing sheet for a roof which can prevent moisture from entering from outside and allow moisture inside the roof to escape to the outside.

[0005]

Means for Solving the Problems As a result of intensive studies, the present inventor has found that a water vapor permeable polyolefin resin film or a laminate of a water vapor permeable polyolefin resin film and a fabric having specific characteristics is selected. It has been found that the above object can be achieved by using the sheet as a roof waterproof sheet, and the present invention has been accomplished.

That is, the first invention of the present invention is a waterproofing sheet for a roof in which a cloth is laminated on the surface of a water vapor permeable polyolefin resin film, wherein the waterproofing sheet has a watertightness of less than 15 mm and a moisture permeability of less than 15 mm. 500g / m ² · 24h
r or more, slip property is 0.4 or more, breaking strength is 10 kg
/ 25 mm or more and a basis weight of 150 g / m ² or more.

A second invention of the present invention is a waterproofing sheet for a roof comprising a water vapor permeable polyolefin resin film, wherein the waterproofing sheet has a watertightness of less than 15 mm and a moisture permeability of 500 g / m ² · 24 hr or more. And a roof waterproof sheet characterized by having a slip property of 0.4 or more, a breaking strength of 10 kg / 25 mm or more, and a basis weight of 150 g / m ² or more.

In the present invention, the watertightness, the moisture permeability, the slip property, the breaking strength and the basis weight of the roof waterproof sheet are characteristic values measured by the methods described later.

The roof waterproof sheet of the present invention is formed into a film by a T-die extrusion molding method, an inflation molding method, or the like, if necessary, further adding an additive to a resin composition containing a polyolefin resin and an inorganic filler. After that, the porous film is stretched at least uniaxially to obtain a porous film having water vapor permeability, and is manufactured by laminating a fabric on the porous film single layer or the surface of the porous film.

Hereinafter, the present invention will be described in detail. Examples of the polyolefin resin used in the present invention include polypropylene, low-density polyethylene (hereinafter, referred to as LDPE), medium-density polyethylene (hereinafter, referred to as MDPE), high-density polyethylene (hereinafter, referred to as HDPE),
Linear low density polyethylene (hereinafter referred to as LLDPE),
Examples thereof include polybutene, an ethylene-propylene copolymer, and an ethylene-vinyl acetate copolymer. These are used alone or in combination of two or more. Preferably LDPE
And particularly preferably LLDPE.

As the inorganic filler, for example, barium sulfate, calcium sulfate, barium carbonate, calcium carbonate,
Magnesium hydroxide, aluminum hydroxide, zinc oxide,
Examples thereof include magnesium oxide, titanium oxide, silica, and talc, and particularly, barium sulfate, calcium carbonate, and magnesium hydroxide are preferably used. These inorganic fillers are used alone or in a mixture of two or more. The amount of the inorganic filler to be used is generally 20 to 200 parts by weight based on 100 parts by weight of the polyolefin resin.

Further, stabilizers, antioxidants, coloring agents, ultraviolet absorbers, dispersants, lubricants and the like may be added as long as the effects of the present invention are not impaired.

A preferred method for producing the water vapor permeable polyolefin resin film used in the present invention is to use the above-mentioned polyolefin resin, inorganic filler, and other additives as necessary, such as a Henschel mixer, a super mixer, a tumbler type mixer and the like. And then kneaded with a conventional single-screw or twin-screw extruder to form pellets.

Next, after adding another pelletized polyolefin resin to the obtained pellets, if necessary, the temperature is higher than the melting point of the base resin, preferably higher than the melting point + 20 ° C.
Melt film formation is performed at a temperature lower than the decomposition temperature of the base resin using an inflation molding machine, a T-die molding machine, or the like. In some cases, the resin composition can be directly formed into a film without being pelletized.

By stretching the formed film at least uniaxially by a known method such as a roll method or a tenter method, a porous water vapor permeable polyolefin resin film can be obtained. Stretching may be performed in multiple stages, or may be performed in two or more directions.

The stretching temperature is preferably in a range from a temperature near room temperature to a temperature lower than the melting point of the base resin. The stretching ratio is preferably in the range of about 1.1 to 10 times. If it is less than 1.1 times, a film having good water vapor permeability cannot be obtained. On the other hand, when the ratio is more than 10 times, the film is broken at the time of stretching and the productivity and workability are lowered, which is not preferable.

The polyolefin-based resin film stretched under the above conditions is 2000 to 15000 g / m ² · 24 h
It is a porous film having a water vapor permeability (moisture permeability) of about r, and can be suitably used as a roof waterproof sheet.

The thickness of the water vapor permeable polyolefin resin film is about 10 to 1000 μm. If the thickness is less than 10 μm, breakage is likely to occur during production, which causes problems in productivity and workability. Although there is no particular upper limit for the thickness, 1000 μ
m is preferable.

When the polyolefin resin film produced by the above method is used as a single-layer roof waterproof sheet, it is preferable to use a film having a thickness of 150 to 1000 μm. When the thickness is less than 150 μm, the breaking strength, the basis weight, and the like of the waterproof sheet for roof are reduced, which is not preferable.

Another roof waterproof sheet of the present invention can be obtained by laminating a cloth on the polyolefin resin film produced by the above method.

As the cloth, for example, a nonwoven fabric made of synthetic resin, a net-like sheet made of synthetic resin, a cloth made of synthetic resin fiber such as nylon and tetron, and a cloth made of natural fiber such as cotton and hemp, etc. And the like. Among these, a nonwoven fabric made of synthetic resin and a net-like sheet made of synthetic resin are preferably used because of their low water retention. A preferable surface state of the fabric is that the surface has good smoothness,
Those having high tensile breaking strength are desirable.

The basis weight of the fabric is not particularly limited, but usually is 10 g / m ² or more. When the moisture permeation of the water-permeable polyolefin resin film and the fabric is small, the water vapor-permeable polyolefin resin film and the fabric are alternately laminated in a plurality of layers so that the roof waterproof sheet has a basis weight of 150 g / m ² or more. What is necessary is just to make it a laminated body.

The lamination of the water vapor permeable polyolefin resin film and the fabric is performed by a known method such as adhesion by heat fusion or adhesion by an adhesive. By lamination, the pores of the water vapor permeable polyolefin resin film are closed, and as a result, the moisture permeability of the waterproof sheet is reduced. Therefore, in order to suppress this decrease, the fused or bonded portion has a lattice shape, a dot shape, a linear shape, or the like. It is preferred to fuse or adhere so that

The laminate sheet thus obtained is excellent in workability, water tightness, slip property, breaking strength and has excellent water vapor permeability, so that it is most suitable as a waterproof sheet for roof. Things.

The waterproofness of the waterproofing sheet for roof of the present invention is 15
mm. When the thickness is 15 mm or more, the amount of water intrusion from the outside becomes too large, and it becomes difficult to function as a roof waterproof sheet.

The moisture permeability of the waterproof sheet is 500 g / m ² ·
24 hours or more. If the water resistance is less than 500 g / m ² · 24 hr, the water vapor permeation of the waterproof sheet is insufficient, so that the moisture inside the roof hardly escapes to the outside.

The slip property of the waterproof sheet is 0.4 or more. If it is less than 0.4, the waterproof sheet slips on the roof shingle during the operation, or the practitioner walks on the sheet and works, which is not preferable because the practitioner slips.

The breaking strength of the waterproof sheet is 10 kg / 25.
mm or more. It is preferably at least 20 kg / 25 mm. If the thickness is less than 10 kg / 25 mm, the rigidity is insufficient, so that the film tends to be stretched or torn, making it difficult to carry out the film.

Further, the weight of the waterproof sheet is 150 g / m.
² or more. If it is less than 150 g / m ² , the sheet flaps due to wind or the like at the time of construction on the roof shingle, which causes a problem that construction is difficult, which is not preferable.

The waterproof sheet for roof of the present invention is preferably coated or printed with an anti-slip agent on one side or both sides to improve the slip property.

The characteristic values of the roof waterproof sheet of the present invention are measured by the following methods.

1. Watertightness Place a waterproof sheet on a 12 mm thick waterproof plywood, and hit one colonial nail from the top of the waterproof sheet until the head of the nail rises about 10 mm from the surface of the plywood. The inner diameter of the nail is 35 mm. Set up a transparent pipe and seal it to prevent water leakage. 250mm in advance for the pipe
Scale every 1 mm up to the height of. After the seal has dried, pour water up to a height of 250 mm of the pipe,
The amount of water loss after 24 hours at room temperature was measured. In order to subtract the evaporation due to air temperature from this measurement value, a similar pipe was set up while the bottom was closed as a blank at the same time, and the value obtained by subtracting the measurement value obtained by measuring the water reduction was defined as the watertightness (unit: mm). I do.

2. Moisture permeability Measured according to the method of condition B specified in JIS-Z0208 (unit: g / m ² · 24 hr).

3. Slip property A sample in which a waterproof sheet is attached to a weight of 1 kg (6 cm × 10 cm × 2 cm) load is placed on a rubber sheet (SBR) and a wooden plywood (plywood) in a grain direction, and a friction coefficient measuring device (Toyo Seiki Co., Ltd. Tan) (tan θ) of the inclination angle θ when the sample starts to slide using the model AN-S)
Indicated by A is the slip property for the rubber sheet, and B is the slip property for the wooden plywood.

4. Breaking strength Using a tensile tester (trade name: Tensilon, manufactured by Toyo Baldwin Co., Ltd.), a sample sheet having a length of 100 mm and a width of 25 mm is pulled in the length direction of the water-permeable polyolefin resin film, and the sample sheet is broken. The stress at the time of the measurement is measured (unit: kg / 25 mm).

5. The weight of a sample sheet having a length of 100 mm and a width of 100 mm is measured and converted into a weight per 1 m ² (unit: g / m ² ).

[0037]

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to the examples. In addition, the performance evaluation of the waterproof sheet shown in the Example of this invention was performed by the following method.

(1) Workability In order to simulate the roof of a house, a wooden stand (width 10 m, depth 2 m) having an inclined surface of tan θ = 0.3 was installed outdoors, and the wooden stand was mounted on the inclined surface. The state of the waterproof sheet having a length of 8 m and a width of 1 m when the sheet is spread and placed thereon is observed and evaluated as follows. ：: The sheet does not flutter and does not slip off the table. Δ: The sheet does not flutter, but slips from the table. ×: The sheet does not slip from the table, but flutters.

(2) Walkability After the performance evaluation of (1) is completed, an evaluator wearing rubber soles is allowed to walk on a waterproof sheet and evaluated as follows. ：: No problem in walking. ×: The evaluator slips on the waterproof sheet, or slips between the waterproof sheet and the wooden table.

(3) Deformation of the waterproof sheet after walking The state of the waterproof sheet after the performance evaluation of (2) is completed is evaluated as follows. ：: No deformation of the waterproof sheet was observed. ×: The waterproof sheet is deformed or broken.

Example 1 A polyolefin resin (A1) having a melt index (hereinafter referred to as MI) and a density shown in Table 1 was prepared.
An inorganic filler (B1) and an additive (C1) having an average particle diameter shown in [Table 1] were used in a mixing ratio shown in [Table 2].
They were mixed using a tumbler mixer to obtain a resin composition. The obtained resin composition was processed into pellets using a vent-type twin-screw extruder. The pellets were melt-formed at 230 ° C. using a T-die molding machine, and then uniaxially stretched at a draw ratio of 2.3 times between a preheating roll heated to 80 ° C. and a stretching roll [Table 2]. A water vapor permeable polyolefin resin film (F
1) was obtained.

A water-permeable fabric having the same dimensions as that of the above-mentioned heat laminating method using a warif (a net-like cloth made of polyethylene, trade name: EX-24, manufactured by Nisseki Plastics Co., Ltd.) having a basis weight of 50 g / m ² was used. A polyolefin-based resin film (F1) and a warif are heat-sealed to form a F1, a warif, and a F1.
, A roof waterproof sheet 1 having a three-layer structure was obtained. The heat-sealed portion was not formed on the entire surface of the sheet, but was heat-sealed in a lattice. The properties and performance of the roof waterproof sheet 1 were measured by the above methods, and the obtained results are shown in [Table 2] and [Table 5]. The roof waterproofing sheet 1 had good workability, water tightness, water vapor permeability, slip properties, and breaking strength.

Example 2 A roof waterproof sheet 2 was obtained in the same manner as in Example 1, except that a roof waterproof sheet having a five-layer structure of F1, warif, F1, warif and F1 was prepared. The characteristics and performance of the obtained five-layer roof waterproof sheet 2 were measured in the same manner as in Example 1, and the obtained results are shown in [Table 2] and [Table 5]. The roof waterproof sheet 2 had good workability, water tightness, water vapor permeability, slip properties, and breaking strength.

Example 3 A roof waterproof sheet 3 was obtained in the same manner as in Example 1 except that a roof waterproof sheet having a five-layer structure of Warif, F1, Warif, F1, and Warif was prepared. The characteristics and performance of the obtained five-layer roof waterproofing sheet 3 were measured in the same manner as in Example 1, and the obtained results are shown in [Table 2] and [Table 5]. The roof waterproofing sheet 3 had good workability, water tightness, water vapor permeability, slip property, and breaking strength.

Example 4 Meltac having a basis weight of 15 g / m ² (manufactured by Hagiwara Kogyo Co., Ltd., polyethylene net fabric, trade name: E3)
A waterproof sheet 4 for a five-layer structure was obtained in the same manner as in Example 2 except that 0H (6 × 6)) was used. Example 1 shows the characteristics and performance of the obtained five-layer roof waterproof sheet 4.
The results are shown in Tables 2 and 5. The roof waterproof sheet 4 had good workability, water tightness, water vapor permeability, slip properties, and breaking strength.

Example 5 A water vapor permeable polyolefin resin film (F2) having a basis weight shown in Table 2 was obtained in the same manner as in Example 1, except that a two-layer structure of F2 and warif was used. In the same manner as in Example 1, a roof waterproof sheet 5 was obtained. Example 1 shows the characteristics and performance of the obtained two-layer roof waterproof sheet 5.
The results are shown in Tables 2 and 5. The roof waterproof sheet 5 had good workability, water tightness, water vapor permeability, slip properties, and breaking strength.

Example 6 A water vapor permeable polyolefin resin film (F3) having a basis weight shown in [Table 3] was obtained in the same manner as in Example 1, and was used for a roof comprising a single layer of F3 without using a fabric. Waterproof sheet 6 was obtained. The characteristics and performance of the roof waterproof sheet 6 were measured in the same manner as in Example 1, and the obtained results are shown in [Table 3] and [Table 5]. The roof waterproofing sheet 6 had good workability, water tightness, water vapor permeability, slip properties, and breaking strength.

Example 7 The inorganic filler (B2) and the additive (C) shown in Table 1 were used.
2) except that each was used at the compounding ratio shown in [Table 3].
In the same manner as in Example 1, a water vapor permeable polyolefin resin film (F4) having a basis weight and a moisture permeability shown in [Table 3] was obtained. Using the obtained F4, a roof waterproof sheet 7 having a three-layer structure of F4, warif and F4 was obtained in the same manner as in Example 1. The properties and performance of the obtained three-layer roof waterproof sheet 7 were measured in the same manner as in Example 1, and the obtained results are shown in [Table 3] and [Table 5]. The roof waterproof sheet 7 was excellent in all of the workability, water tightness, water vapor permeability, slip property, and breaking strength.

Example 8 The polyolefin-based resin (A2), the inorganic filler (B1) and the additive (C1) shown in Table 1 were used at the compounding ratio shown in Table 3, respectively, and were used in a tumbler mixer. And mixed to obtain a resin composition. The obtained resin composition was processed into a pellet using a vent-type twin-screw extruder. The pellets were melt-formed at 210 ° C. using a T-die molding machine, and then uniaxially stretched at a draw ratio of 2.3 times between a preheating roll and a stretching roll heated to 70 ° C. to obtain Table 3 A water vapor permeable polyolefin resin film (F5) having the indicated basis weight and moisture permeability was obtained. Except that the obtained F5 was used, F5, warif and F5 were obtained in the same manner as in Example 1.
A roof waterproof sheet 8 having a layer structure was obtained. The properties and performance of the obtained three-layer roof waterproof sheet 8 were measured in the same manner as in Example 1, and the obtained results are shown in [Table 3] and [Table 5]. Roof waterproofing sheet 8 is easy to install, watertight,
Water vapor permeability, slip property, and breaking strength were all good.

Example 9 The polyolefin-based resin (A3), the inorganic filler (B2) and the additive (C2) shown in Table 1 were used at the compounding ratio shown in Table 3, respectively, and were used in a tumbler mixer. And mixed to obtain a resin composition. The obtained resin composition was processed into a pellet using a vent-type twin-screw extruder. The pellets are melt-formed at 220 ° C. using a T-die molding machine, and then stretched at a draw ratio of 7.0 times between a preheating roll and a stretch roll heated to 80 ° C. in the machine direction (MD) of the film.
And then biaxially stretched at 90 ° C. in a direction perpendicular to the machine direction of the film (TD) at a stretch ratio of 2.0 times, and steam having a basis weight and a moisture permeability shown in [Table 3]. A transparent polyolefin-based resin film (F6) was obtained. Except for using the obtained F6, a roof waterproof sheet 9 having a three-layer structure of F6, warif, and F6 is formed in the same manner as in Example 1.
I got The properties and performance of the obtained three-layer roof waterproof sheet 9 were measured in the same manner as in Example 1, and the obtained results are shown in [Table 3] and [Table 5]. The roof waterproofing sheet 9 had good workability, water tightness, water vapor permeability, slip properties, and breaking strength.

Example 10 A polyolefin resin (A4), an inorganic filler (B2) and an additive (C2) shown in [Table 1] were used in the mixing ratio shown in [Table 3], respectively, and these were used using a tumbler mixer. And mixed to obtain a resin composition. The obtained resin composition was processed into a pellet using a vent-type twin-screw extruder. The pellets were melt-formed at 220 ° C. using a T-die molding machine, and then uniaxially stretched at a stretch ratio of 7.0 between a preheating roll and a stretch roll heated to 90 ° C.
2.0 ° C perpendicular to the machine direction of the film at ℃
The film was successively biaxially stretched at twice the draw ratio to obtain a water vapor permeable polyolefin resin film (F7) having a basis weight and a moisture permeability shown in [Table 3]. A roof waterproof sheet 10 having a three-layer structure of F7, warif and F7 was obtained in the same manner as in Example 1 except that the obtained F7 was used. The characteristics and performance of the obtained three-layer roof waterproof sheet 10 were measured in the same manner as in Example 1, and the obtained results are shown in [Table 3] and [Table 5]. The roof waterproof sheet 10 was excellent in workability, water tightness, water vapor permeability, slip property, and breaking strength.

Example 11 The same procedure as in Example 1 was carried out except that a porous film having a basis weight shown in Table 4 (porous film manufactured by Tokuyama Soda Co., Ltd .; hereinafter, referred to as F8) was used as a water vapor permeable polyolefin resin film. A laminate having a three-layer structure of F8, warif, and F8 was obtained by the method, and then an anti-slip agent (trade name: PSA-K, manufactured by Dainichi Seika Kogyo Co., Ltd.) was applied to both surfaces (F8 surface) of the obtained laminate.
OM medium) to perform anti-slip printing (stripe shape) to obtain a roof waterproof sheet 11. The properties and performance of the obtained three-layer roof waterproof sheet 11 were measured in the same manner as in Example 1, and the obtained results are shown in [Table 4] and [Table 5]. The roof waterproof sheet 11 was excellent in all of the workability, water tightness, water vapor permeability, slip property, and breaking strength.

Comparative Example 1 A commercially available waterproof sheet (trade name: asphalt felt, manufactured by Tajima Roofing Co., Ltd.) was used as the waterproof sheet 12 for roof. The characteristics and performance of the waterproof sheet 12 are shown in Example 1.
The measurement was carried out in the same manner as described above and shown in [Table 4] and [Table 5].
Although the roof waterproof sheet 12 is excellent in breaking strength and slip property, it has poor water tightness and almost no water vapor permeability, so that it did not have the ability to escape moisture entering the inside of the roof to the outside. .

Comparative Example 2 F1 was used as a water vapor permeable polyolefin resin film.
Was used without using a fabric to obtain a roof waterproof sheet 13 composed of an F1 single layer. The characteristics and performance of the waterproof sheet 13 were measured in the same manner as in Example 1, and are shown in [Table 4] and [Table 5]. The roof tarpaulin 13 has water vapor permeability,
Although it is excellent in water tightness and slipping property, it has low weight per unit area and rupture strength, so that the sheet flaps at the time of execution, and the sheet is deformed or broken during walking on the sheet, resulting in poor workability.

Comparative Example 3 A roof tarpaulin 1 was produced in the same manner as in Example 1 except that the structure of the roof tarpaulin was a two-layer structure of F1 and warif.
4 was obtained. The characteristics and performance of the roof waterproof sheet 14 were measured in the same manner as in Example 1, and are shown in [Table 4] and [Table 5]. The roof tarpaulin 14 has water vapor permeability,
Excellent in water tightness, slip property and strength, but easy to flutter due to small basis weight and poor workability.

Comparative Example 4 A waterproofing sheet 15 for roof having a three-layer structure of F8, warif and F8 was obtained in the same manner as in Example 1 except that commercially available F8 was used as a water vapor permeable polyolefin resin film.
Example 1 shows the characteristics and performance of the roof waterproof sheet 15.
The measurement was carried out in the same manner as described above and shown in [Table 4] and [Table 5].
The roof waterproof sheet 15 is excellent in workability, water tightness, water vapor permeability and strength, but has a small slip property with respect to veneer, so that a problem such as slipping of the sheet on a roof shingle during construction occurs.

[0057]

[Table 1]

[0058]

[Table 2]

[0059]

[Table 3]

[0060]

[Table 4]

[0061]

[Table 5]

[0062]

The waterproofing sheet for roofs of the present invention has excellent watertightness, so that intrusion of moisture from the outside can be prevented, and even if a little moisture enters, it is released to the outside as water vapor. As a result, the roof shingle and the like can be made to last longer without being corroded. In addition, it is excellent in workability, slip property, and breaking strength, and is optimal as a roof waterproof sheet.

──────────────────────────────────────────────────続 き Continued on the front page Examiner Satoshi Aoyama (58) Field surveyed (Int. Cl. ⁷ , DB name) E04D 5/06 E04D 5/10 E04D 12/00 D06N 5/00

Claims (2)

(57) [Claims] 1. A waterproof sheet for roofs formed by laminating the fabric to the surface of the water vapor permeable polyolefin resin film, watertight less than 15mm of waterproof sheet, the moisture permeability is 500g / m ² · 24hr or more, Slip property is 0.4 or more, breaking strength is 10 kg / 25 mm or more, and basis weight is 1
A roof tarpaulin having a weight of 50 g / m ² or more. 2. A waterproof sheet for roofs made of water vapor permeable polyolefin resin film, watertight less than 15mm of waterproof sheet, the moisture permeability is 500 g / m ² · 2
4 hr or more, slip property of 0.4 or more, breaking strength of 10
A waterproofing sheet for a roof, wherein the waterproofing sheet has a weight of at least 150 kg / m ² and a weight of 150 g / m ² or more.