JPH05147173A - Composite sheet for building material - Google Patents

Abstract

PURPOSE:To provide a moisture penetration property, a wafer resistance, and an anti-sliding property, and also provide water-leakage prevention after nailing by hot-press bonding an elastmer film made of a thermoplastic elastmer composite by an air cooling inflation method and a fiberlike base material. CONSTITUTION:An elastmer film is manufactured from a thermoplastic elastmer composite containing 30-70wt.% rubber of ethylene-propylene-diene copolymer and 70-30wt.% thermoplastic elastomer of ethylene-vinyl acetate copolymer by an air inflation method. A composite sheet made by hot-press bonding the film and a fiberlike base material 12 is allowed to be 800g/m<2>.day or more in its moisture penetration degree and 500mm H2O or more in its water preventive degree. Herein, it is preferable that the ethylene-propylene-diene copolymer rubber has a content of 60-70mol.% ethylene, a content of 30-40% propylene, and a content of 1-10mol.% diene compound.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite sheet for building materials, and in particular, it comprises a film made of ethylene-propylene-diene copolymer rubber and a film of ethylene-vinyl acetate copolymer and a fibrous base material, and has a moisture permeability. , A sheet for a building material which is excellent in water resistance and slip resistance and is effective as a wall material or a roof material.

[0002]

2. Description of the Related Art Conventionally, the problems to be solved by the invention
BACKGROUND ART Sheets for various building materials are used for roofs, ceilings, walls, floors, etc. of buildings for the purpose of waterproofing, windproofing, heat retention, heat insulation, and the like.

Examples of the sheet for building materials include asphalt felt, asphalt-impregnated paper, and non-woven fabric made of synthetic resin such as polyethylene and polyester. However, these building material sheets are not sufficiently waterproof if they have excellent moisture permeability and breathability, such as non-woven fabrics made of synthetic resin such as polyethylene and polyester, and also waterproofing such as asphalt felt and asphalt impregnated paper. Those having excellent properties have insufficient moisture permeability and air permeability, and in any case, there is a problem that a hole penetrating the sheet at the time of nailing is opened and water is likely to leak there.

As an improvement of such a building material sheet, Japanese Patent Laid-Open No. 223249/1988 discloses a building material which is composed of a laminate of a stretched film of a polyolefin mixed with a filler and a polyolefin tape woven fabric and has excellent moisture permeability. A sheet for use is disclosed.

However, although the above-mentioned building material sheet has improved moisture permeability, waterproofness, strength and the like as compared with the conventional ones, when it is used as a roofing material or the like, it is poor in slip resistance and is safe in construction work. However, there is a problem in that it has not been sufficiently improved and the prevention of water leakage after nailing has not been sufficiently improved.

[0006] Therefore, an object of the present invention is to provide a composite sheet for building materials which is excellent in moisture permeability, water resistance, and slip resistance, and has the ability to prevent water leakage after nailing.

[0007]

As a result of earnest research in view of the above objects, the present inventors have found that a film made of an elastomer composition comprising an ethylene-propylene-diene copolymer rubber and an ethylene-vinyl acetate copolymer is used. The composite sheet obtained by hot-pressing a fibrous base material has excellent moisture permeability, water resistance, and slip resistance, and also has the ability to prevent water leakage after nailing, making it suitable as a composite sheet for building materials. Therefore, the present invention has been accomplished.

That is, the composite sheet for building materials of the present invention is
(a) Ethylene-propylene-diene copolymer rubber 30 to 70
70% to 30% by weight of ethylene-vinyl acetate copolymer
A composite sheet obtained by hot pressing a (b) fibrous base material and an elastomer film formed by air-cooling inflation method from a thermoplastic elastomer composition containing, and having a moisture permeability of 800 g / m ²・ Water resistance of 50 or above for day
It is characterized in that it is 0 mmH ₂ O or more.

The present invention is described in detail below. First, the elastomer film used in the present invention will be described. The elastomer film was formed by an air-cooled inflation method from a thermoplastic elastomer composition containing 30 to 70% by weight of ethylene-propylene-diene copolymer rubber and 70 to 30% by weight of ethylene-vinyl acetate copolymer. It is a thing.

The ethylene-propylene-diene copolymer rubber (EPDM) used in the present invention is a copolymer containing ethylene, propylene and a diene compound. Examples of the diene compound include ethylidene norbornene and 1,4
-Hexadiene, dicyclopentadiene and the like.

The ethylene-propylene-diene copolymer rubber (EPDM) has an ethylene content of 60 to 70 mol%,
It is preferable that the propylene content is 30 to 40 mol% and the diene compound content is 1 to 10 mol%. A more preferable range is 62 to 66 mol% of ethylene, 33 to 37 mol% of propylene, and 3 to 6 mol% of diene compound. In addition, melt index (MI, 190 ℃, 2.16kg
The load) is preferably within the range of 0.1 to 5.0 g / 10 minutes, more preferably 0.30 to 1.0 g / 10 minutes, and further preferably 0.35 to 0.50 g / 10 minutes.

The ethylene-vinyl acetate copolymer (EVA) used in the present invention is a copolymer having a vinyl acetate content of 7.5% by weight or more. Particularly, those having a vinyl acetate content within the range of 7.5 to 30% by weight are preferable. In addition, the melt index of ethylene-vinyl acetate copolymer (190 ℃, 2.16
(kg load) is usually 0.2 to 25 g / 10 minutes, preferably 15 to 20
It is g / 10 minutes.

The blending ratio of the ethylene-propylene-diene copolymer rubber (EPDM) and the ethylene-vinyl acetate copolymer (EVA) as described above is ethylene-propylene-
30 to 70% by weight of diene copolymer rubber, preferably 50 to 60
Wt%, ethylene-vinyl acetate copolymer 70 ~ 30
% By weight, preferably 60-40% by weight. When the ethylene-propylene-diene copolymer rubber is less than 30% by weight (when the ethylene-vinyl acetate copolymer exceeds 70% by weight),
When the elasticity of the obtained film decreases, and when the ethylene-propylene-diene copolymer rubber exceeds 70% by weight,
(When the ethylene-vinyl acetate copolymer is less than 30% by weight)
The moldability and softness of the obtained film are deteriorated.

In the present invention, the blocking resistance and moldability of the film can be improved by adding a crystalline polyolefin to the above thermoplastic elastomer composition. As the polyolefin, polyethylene such as low density polyethylene, linear low density polyethylene, and medium / high density polyethylene is preferable. When adding polyolefin, the amount added is EP
It is preferably 30 parts by weight or less based on 100 parts by weight of DM + EVA in total.

Further, in the present invention, in addition to the above resin components, an antioxidant, an ultraviolet absorber, an antistatic agent, a coloring agent and the like can be appropriately blended. However, in the present invention, the addition of the inorganic filler makes it difficult to form a thin film, so it is preferable not to add it.

The elastomer film composed of each component as described above can be manufactured by the following method. First, the components such as the above-mentioned ethylene-propylene-diene copolymer rubber (EPDM), ethylene-vinyl acetate copolymer (EVA), polyolefin which is blended as necessary, and various additives are kneaded. The kneading is preferably carried out at a resin temperature of about 150 to 175 ° C.

After kneading, it is formed into a film.
The thickness of the film is preferably 15 to 200 μm. 15
If it is less than μm, the strength of the obtained film is not sufficient,
If it is thicker than 200 μm, it is difficult to form fine through holes for imparting moisture permeability. The film is formed by the inflation molding method (air cooling method) at a resin temperature of 120 to 185 ° C and a blow ratio (bubble diameter / die slit diameter) of 2.0 to 5.0.
It is preferable to carry out the treatment in such a range. The film of the elastomer composition thus obtained is very stretchable.

The fibrous substrate used in the present invention is not particularly limited as long as it has sufficiently large voids (pores) as the supporting substrate for the above-mentioned thermoplastic elastomer film and has sufficient mechanical strength. ..
Examples thereof include woven cloth, non-woven cloth, knitted fabrics, papers, porous sheets and the like. Among these, non-woven fabrics made of synthetic resin by various manufacturing methods such as flash method, melt blow method, spun pond method and the like are preferable, and particularly polyester-based non-woven cloth,
Polyethylene non-woven fabric is preferred. However, it is necessary that the fibrous base material is not substantially melted or thermally shrunk in the hot pressing step described below. Therefore, it is generally necessary that the melting point or second-order transition point of the fibrous base material is at least 20 ° C. higher than that of the film.

The fibrous base material as described above has a thickness of about 100.
˜2,000 μm, preferably 500 to 1,000 μm.

Next, a method of hot-pressing a film made of the above elastomer composition and a fibrous base material will be described.

The hot pressing of the film and the fibrous base material is preferably carried out by a hot pressing apparatus comprising a heating roll and a receiving roll. For example, the heating roll is preferably 100-
180 ° C., more preferably 110-130 ° C., the receiving roll preferably 25-85 ° C., more preferably 60-80 ° C., preferably 2-6 kgf / cm ² , more preferably 4-6.
It is carried out at a pressure of kgf / cm ² and preferably at a velocity of 0.5 to 30 m / min, more preferably 5 to 20 m / min. When it is out of the range of the pressure bonding conditions, the adhesive strength between the film and the fibrous base material becomes insufficient, the heat shrinkage of the film becomes insufficient, and the microporosification of the film of the elastomer composition becomes insufficient, or On the contrary, it is not preferable because the micropores expand and the water resistance decreases.

The above-mentioned hot pressure bonding does not have to be carried out in one step, and it may be carried out in a plurality of steps in order to secure the fixation of the film and the microporosity. Further, the hot melt adhesive may be applied to the surface of the film of the elastomer composition in advance by spraying the whole surface or a spiral shape. In addition, the hot compression bonding of the film and the fibrous base material is performed by using two films of the thermoplastic elastomer composition in addition to the fibrous base material and the film having a ratio of 1: 1. It may be crimped.

The composite sheet for building materials of the present invention thus obtained has a moisture permeability of 800 g / m ² · day or more, preferably 1,000 to 8,000 g / m ² · day, and a water resistance of 500 mm.
H ₂ O or more, preferably 500 to 2,000 mm H ₂ O,
The coefficient of static friction (measured by ASTM D1894) of the elastomeric film is preferably 1.0 to 2.0, more preferably 1.5.
~ 2.0. The thickness is about 115 to 2,000 μm, preferably 520 to 1,1000 μm.

[0024]

In the present invention, a composite sheet obtained by hot compression bonding a film made of a specific elastomer composition and a fibrous base material is used as a building material composite sheet. Such a composite sheet has a moisture permeability of 800 g / m ² · day or more, a water resistance of 500 mmH ₂ O or more, a static friction coefficient of the surface of the elastomer film side of 1.0 or more, a moisture permeability, It has excellent water resistance and slip resistance, as well as the ability to prevent water leakage after nailing.

Although the reason why such an effect is obtained is not always clear, the elastomer film is microporous by hot-press bonding a film of a specific thermoplastic elastomer composition and a fibrous base material. It is considered that the micropores have excellent moisture permeability and water resistance, and moreover, the static friction coefficient of the elastomer film itself is large.

As for the ability to prevent water leakage after nailing, the building material sheet 1 of the present invention comprising a film 11 of a thermoplastic elastomer composition and a fibrous base material 12 as shown in FIG. It is considered that even if the nail 3 is nailed to penetrate the concrete panel 2, the opening 4 formed by the nail 3 is closed due to the shrinkage of the film 11 of the thermoplastic elastomer composition.

[0027]

The present invention will be described in more detail by the following specific examples. Example 1 and Comparative Examples 1 and 2 Ethylene-prompylene-diene copolymer rubber (EPDM,
Vistalon 3708, manufactured by Exxon Chemical Co., Ltd., 60% by weight,
A composition comprising 40% by weight of ethylene-vinyl acetate copolymer (EVA, DQDJ-3269, manufactured by Nippon Unicar Co., Ltd.) is melt-kneaded at 160 to 170 ° C. by an extruder, and blown at a blow ratio of 3 to 3 by an air cooling inflation method. In No. 5, a film of the thermoplastic elastomer composition having a thickness of 25 μm was obtained.

[0028] One piece of this film and polyester non-woven fabric
(Made by Asahi Kasei Corporation, Miracle PB sheet, weight 120
g / m ² ) and the heating roll side as a polyester non-woven fabric, the heating roll temperature is 120 ° C., the receiving roll temperature is 60 ° C., the pressure is 6 kgf / cm ² , and the pressure is 15 m / min. did.

The unit weight, moisture permeability, air permeability, water resistance, burst strength, tensile strength, tear strength, static friction coefficient, and water leakage prevention ability of the obtained composite sheet were measured. The results are shown in Table 1.

For comparison, the physical properties of the asphalt felt (comparative example 1), which is a conventional building material sheet, and the polyester non-woven fabric used in example 1 (comparative example 2) were also measured in the same manner. did. The results are also shown in Table 1.

Example 2 A film of the thermoplastic elastomer composition used in Example 1 and a polyethylene non-woven fabric (Tyvek, manufactured by DuPont Co., Ltd., basis weight 46 g / m ² ) were used as the polyester non-woven fabric on the heating roll side and the heating roll temperature was set. A composite sheet was manufactured by hot pressing at 120 ° C., a receiving roll temperature of 40 ° C., a pressure bonding pressure of 6 kgf / cm ² , and a pressure bonding speed of 15 m / min.

The unit weight, moisture permeability, air permeability, water resistance, burst strength, tensile strength, tensile elongation, tear strength, static friction coefficient, and water leakage prevention ability of the obtained composite sheet were measured in the same manner as in Example 1. went. The results are shown in Table 1.

For comparison, the physical properties of the polyethylene non-woven fabric used in Example 2 alone (Comparative Example 3) were measured in the same manner. The results are also shown in Table 1.

Table 1 Physical properties of the sheet Example 1 Example 2 Comparative Example 1 Comparative example 2 Unit weight (g / m²)⁽¹⁾ 140 66 1050 120 Water vapor transmission rate (g / m²・ Day)⁽²⁾ 2000 2500 94 2437 Air permeability (cm³/cm²・ Sec)⁽³⁾ 3.5 0.20 0.20 5.9 Water resistance (mmH₂O)^(Four) 500 1300 923 304 Bursting strength (kgf / cm²)^(Five) 4.8 9.0 2.9 4.6 Tensile strength (kgf)⁽⁶⁾MD 30.0 28.7 45.1 29.6 TD 20.0 44.5 29.9 18.1 Tensile elongation (%)⁽⁷⁾MD 25 16 3 30 TD 30 26 4 33 Tear strength (kgf)⁽⁸⁾MD 1.0 1.7 0.4 0.7 TD 1.2 2.1 0.4 0.9 Static friction coefficient (-)⁽⁹⁾ 2.0 2.0 0.9 0.4 Leakage prevention capability (cm³/ 120hr)^(Ten) 3.0 2.0 4.0 10

(1) Unit weight: Measured according to JIS Z 8105. (2) Water vapor transmission rate: Measured by the water vapor transmission rate test method (30 ° C, 90% RH) in accordance with JIS Z 0208. (3) Air permeability: Measured by JIS L 1096A method. (4) Water resistance: Measured by JIS L1092 low water pressure method. (5) Bursting strength: Measured by JIS L 1096A method. (6) Tensile strength: Measured according to JIS L1085 on a test piece with a width of 5 mm. (7) Tensile elongation: Measured according to JIS L1085 on a test piece with a width of 5 mm. (8) Tear strength: Measured by JIS L1085A-1 method. (9) Static friction coefficient: measured according to ASTM D1894. (10) Leakage prevention ability: As shown in Fig. 2, a building material sheet 21 is nailed together with a colonial 22 with a 3.2 mmφ nail 23 to a 25 mm thick concrete panel 24, and a 75 mmφ funnel is placed from above.
A 25 and 5 ml measuring pipette 26 joined with a rubber stopper 27 was covered, and the amount of water reduction was measured after keeping the funnel 25 and 5 ml measuring pipette 26 filled with water for 120 hours.

As is apparent from Table 1, the composite sheet of the present invention had large values of moisture permeability and water resistance, and the coefficient of static friction was within the range of 1.0 to 2.0. On the other hand, the conventional example of asphalt felt is inferior in water vapor transmission rate and static friction coefficient, and the non-woven fabric used alone is
It was inferior in water resistance, water leakage prevention ability and static friction coefficient.

[0037]

INDUSTRIAL APPLICABILITY In the present invention, a composite sheet for a building material is a composite sheet obtained by hot pressing a film made of a specific elastomer composition and a fibrous base material.
Such a composite sheet has a moisture permeability of 800 g / m ² · day or more, a water resistance of 500 mmH ₂ O or more, and a moisture permeability,
It has excellent water resistance and slip resistance, as well as the ability to prevent water leakage after nailing.

Such a composite sheet of the present invention is particularly suitable as a composite sheet for building materials as a windproof and moistureproof material for roofs, floors, walls and the like.

[Brief description of drawings]

FIG. 1 is a schematic view showing a water leakage prevention action of a building material composite sheet of the present invention.

FIG. 2 is a schematic view showing a water leakage prevention ability test method in Examples.

[Explanation of symbols]

 1, 21 ... Building material sheet 2, 24 ... Concrete panel 3, 23 ... Nail 4 ... Opening 11 ... Thermoplastic elastomer composition film 12 ... Fibrous substrate 22・ ・ ・ Colonial 25 ・ ・ ・ Funnel 26 ・ ・ ・ Measuring pipette 27 ・ ・ ・ Rubber stopper

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI Technical display area B29K 23:00 B29L 9:00 4F

Claims (1)

[Claims] 1. A thermoplastic elastomer composition containing (a) 30 to 70% by weight of an ethylene-propylene-diene copolymer rubber and 70 to 30% by weight of an ethylene-vinyl acetate copolymer by an air-cooled inflation method. A composite sheet obtained by hot-pressing a formed elastomer film and (b) a fibrous base material, having a moisture permeability of 800 g / m ² · day or more and a water resistance of 500 mmH ₂ O or more. A composite sheet for building materials, which is characterized by