JPH07268971A - Moisture permeable and waterproof composite sheet for building material - Google Patents

Abstract

PURPOSE:To provide a moisture permeable and waterproof composite sheet for building material which has both moisture permeability and waterproof property, and particularly having excellent nailing leak preventing property capable of preventing the leak from the nailed part after the sheet is mounted by nailing by use of a nail. CONSTITUTION:A synthetic resin sheet 3 having 15% or more of the impact resilience measured by JISK 6301 are partially laminated on both outer surfaces of a bonded sheet 2 obtained by locally bonding two porous sheets 1, 1 having fine pore parts to each other. Opening parts 4 to which the surface of the porous sheet 1 is exposed are formed in such a manner as to be never mutually superposed, seen from the thickness direction of the bonded sheet 2. Thus, the resulting sheet has excellent moisture permeability and waterproof property, and particularly, excellent nailing leak preventing property capable of preventing the leak from the nailed part after the sheet is mounted by nailing by use of a nail, and since the performance can be kept regardless of the nailing position, it is highly usable as a building material for top facing of wall member or roof bed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a moisture-permeable and waterproof composite sheet for building materials, and in particular, it is capable of preventing leakage of water from a nail sheet after installation by nailing with a nail. The present invention relates to a moisture-permeable / waterproof composite sheet for building materials, which has properties and can be suitably used as a building material such as an outermost wall material or a roof substrate.

[0002]

2. Description of the Related Art (a) A sheet in which a non-woven fabric is impregnated with asphalt, and (b) an olefin resin added with a filler as a building material used for the outermost of the above-mentioned wall materials or for the roof substrate. There are known porous sheets having fine pores obtained by stretching a sheet made of, for example, and (c) non-woven fabric. However, although the sheet (a) has excellent waterproofness and water leakage prevention after nailing, it does not have moisture permeability, and therefore has a problem that moisture from the inside is blocked by the sheet and the base plate material is rotted. there were. Also, (b)
The sheet and the non-woven fabric of (c) can satisfy the waterproof property and the moisture permeability by controlling the pore size of the sheet or the non-woven fabric, but there is a problem in that the nailing water leakage prevention property is poor.

[0003]

DISCLOSURE OF THE INVENTION The present invention has found a moisture-permeable / water-proof composite sheet for building materials which can solve the above problems, and its gist is to provide two sheets having fine pores. The porous sheet 1, 1 is locally joined to both outer surfaces of the joining sheet 2 and the synthetic resin sheet 3 having a repulsion elastic modulus of 15% or more measured by JISK 6301 is partially laminated to form a porous sheet. Opening 4 with exposed surface 1
Is formed so as not to overlap each other when viewed in the thickness direction of the bonding sheet 2, and a composite sheet for moisture-permeable / waterproof building material.

The present invention will be described in detail below with reference to the drawings. 1 is a schematic sectional view showing an example of a composite sheet for building materials of the present invention, FIG. 2 is a schematic plan view of the composite sheet shown in FIG. 1,
FIG. 3 is a schematic cross-sectional view showing a usage state of the composite sheet shown in FIGS. 1 and 2.

The porous sheet 1 used in the present invention has fine pores, and the diameter of the pores is usually about 1 to 100 μm, which is excellent in waterproofness and moisture permeability. preferable. Various methods are known as a method for producing such a porous sheet 1, and for example, a method for obtaining a sheet made of an olefin resin or the like to which a filler is added by stretching, or a hot needle for a synthetic resin sheet is used. Mechanically perforating, a method of irradiating a synthetic resin sheet with a laser / ion beam, or the like. The thickness of the porous sheet 1 is not particularly limited, but normally, a thickness of 30 to 200 μm can be preferably used due to manufacturing problems.

Two porous sheets 1 are used and locally joined to obtain a joined sheet 2. As a method for locally joining, a method such as a method using heat fusion or a method using an adhesive may be used to join in a dot shape, a line or the like, and the pattern and area of the joining portion can be set arbitrarily. It is preferable to reduce the area of the bonded portion as much as possible within the range where the sheets are not separated.

Synthetic resin sheets 3 are partially laminated on both outer surfaces of the above-mentioned joining sheet 2 in order to impart waterproofness. The synthetic resin sheet 3 to be used is JIS K6.
It is necessary to use a synthetic resin sheet whose impact resilience measured by 301 is 15% or more. By using such a synthetic resin sheet, when nailing with the nail 5 as shown in the schematic cross-sectional view of FIG. 3, the synthetic resin tightens the nail from all directions by the repulsive elasticity of the synthetic resin sheet 3. Water leakage from the gap between the nail and the sheet can be prevented.
Even if a synthetic resin sheet having a rebound resilience of less than 15% is used, the above-mentioned nail nail leakage prevention property cannot be improved.

Examples of the synthetic resin sheet 3 having a rebound resilience of 15% or more include olefin elastomers such as ethylene-propylene-diene copolymers and ethylene-propylene copolymers, polyurethane elastomers, polystyrene elastomers, polyesters. -Based elastomers, polyvinyl chloride-based elastomers, chlorinated polyethylene, ethylene-vinyl acetate copolymer, polyethylene ethyl acrylate, and mixtures of these resins can be preferably used, and those which satisfy the above-mentioned impact resilience are selected. Good. The thickness of the synthetic resin sheet 3 varies depending on the impact resilience of the synthetic resin sheet used, but is 0.2 to 3
The thing of about mm can be used conveniently.

Here, as shown in FIGS. 1 and 2, the synthetic resin sheet 3 is partially laminated on both outer surfaces of the joining sheet 2 to form an opening 4 in which the surface of the porous sheet 1 is exposed. To be done. Moisture can freely enter and pass through the composite sheet 2 through the openings 4. Further, the openings 4 need to be formed so as not to overlap each other when viewed in the thickness direction of the joining sheet 2, and it is possible to penetrate one of the synthetic resin sheets 3 at any position no matter where the nail is struck. It is possible to improve the nail leakage prevention property.

Here, as shown in the schematic plan view of FIG. 2, the size of the portions d where the boundary portions of the openings 4 do not overlap each other when viewed in the thickness direction of the joining sheet 2 is such that the width is at least the diameter of the nail. The thickness may be set to a degree (usually 5 to 20 mm) or more, and the synthetic resin sheet 3 can be penetrated regardless of the nailing position.

The shape and area of the opening 4 can be appropriately determined in consideration of the required moisture permeability and waterproofness, and the shape may be a band shape or another shape as shown in FIG. Normally, it is preferable to provide the total area of the openings 4 on one side within a range of about 40 to 50% of the total area on one side of the composite sheet.

As a method of laminating the synthetic resin sheet 3 on the joining sheet 2, a method of partially dissolving a synthetic resin by dissolving it in a solvent, or laminating a synthetic resin sheet 3 formed in advance by a heating method or an adhesive agent is used. Lamination can be carried out by a usual method such as a method and an extrusion laminating method. Furthermore, it is also possible to laminate the porous sheet 1 and the synthetic resin sheet 3 in advance and then locally bond the two laminated sheets on the surface of the porous sheet 1. Hereinafter, the present invention will be described with reference to examples.

[0013]

【Example】

Example 1: High density polyethylene (density: 0.96 g / c
m ³ ) 100 parts by weight of calcium carbonate (average particle size 1.8
100 μ parts by weight of the composition, and then extruded into a sheet at a die temperature of 220 ° C., and then stretched at a stretching temperature of 110 ° C. by 2.5 times in each of the longitudinal and transverse directions to form a porous sheet having a thickness of 50 μm. Obtained. Then, this porous sheet was locally bonded at 180 ° C. by a heat fusion method to obtain a bonded sheet 2. Further, an ethylene-propylene-diene copolymer (rebound resilience rate according to JIS K6301 = 40%) was extruded and laminated partially on the both sides of the joining sheet 2 at an extrusion temperature of 180 ° C. so that the sheet thickness was 200 μm, A composite sheet as shown in FIGS. 1 and 2 was obtained. In this case, the area ratio of the formed openings was 40%.

Using the obtained composite sheet, "moisture permeability",
"Waterproofness" and "nail driving water leakage prevention" were evaluated. The “moisture permeability” was measured at a measurement temperature of 25 ° C. according to JIS Z-0208. The “waterproofness” was measured according to the Kenken-type waterproof test method (Ministry of Construction, Institute of Architecture). Regarding the "nail driving water leakage prevention property", the sheet with nails having a diameter of 3 mm was judged based on the presence or absence of water leakage in accordance with the Kenken waterproof test method. Results measured by the above method ... Moisture vapor transmission rate = 2,500
g / m ² × 24 hours Water resistance = 0.10 ml or less (24 hours) Nail driving water leakage prevention = No water leakage All evaluation items were good.

Comparative Example 1: The thickness used in Example 1 is 50μ
m porous sheet. Results of performing the same evaluation as in Example 1 ... Moisture vapor transmission rate = 4,021 g / m ² × 24
Time Water resistance = 0.10 ml or less (24 hours) Nailing water leakage prevention property = Water leakage It is understood that although moisture permeability is extremely excellent, nailing water leakage prevention property is inferior.

Comparative Example 2: Ethylene used in Example 1
A sheet having a thickness of 400 μm formed by extrusion-molding a propylene-diene copolymer (repulsion elastic modulus according to JIS K 6301 = 40%) at 180 ° C. The result of performing the same evaluation as in Example 1 ... Moisture vapor transmission rate = 15 g / m ² × 2
4 hours Water resistance = 0.10 ml or less (24 hours) Nailing water leakage prevention property = No water leakage Although water resistance and nailing water leakage prevention property are excellent, it is found that the moisture permeability is poor.

Examples 2 to 6 and Comparative Examples 3 to 6: Composite sheets having the same contents as in Example 1 except that the ethylene-propylene-diene copolymer was changed to a resin having a repulsion elastic modulus shown in Table 1. The same evaluation as in Example 1 was performed and the results are shown in Table 1.

[0018]

[Table 1] It can be seen from Table 1 that the rebound resilience of 15% or more is excellent in waterproofness and the effect of preventing water leakage after nailing.

[0019]

As described above, according to the composite sheet for building material of the present invention, it is excellent in moisture permeability and waterproof property, and in particular, it is an excellent nail which can prevent water leakage from the part after mounting by nailing with a nail. Since it has a water spalling prevention property and can maintain its performance regardless of the position of nail driving, it can be suitably used as a building material such as the outermost wall material or the roof substrate.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing an example of a building material composite sheet of the present invention.

FIG. 2 is a schematic plan view of the composite sheet shown in FIG.

FIG. 3 is a schematic cross-sectional view showing a usage state of the composite sheet for building materials shown in FIGS.

[Explanation of symbols]

 1 Porous Sheet 2 Joining Sheet 3 Synthetic Resin Sheet 4 Opening

Claims (1)

[Claims] 1. A repulsion elastic modulus measured by JISK 6301 on both outer surfaces of a joining sheet (2) formed by locally joining two porous sheets (1), (1) having fine pores. Of 15% or more of the synthetic resin sheet (3) are partially laminated so that the openings (4) where the surface of the porous sheet (1) is exposed do not overlap each other when viewed in the thickness direction of the bonding sheet (2). Moisture permeability characterized by being formed in
Composite sheet for waterproof building materials.