JPH094075A - Moisture-permeable waterproof sheet - Google Patents

Abstract

PURPOSE: To prevent dewing in the inside of a building and prevent penetration of water through nail holes due to nailing on erecting it. CONSTITUTION: A coating layer having a waterproof property and a sealing property against nail holes like asphalt or rubber asphalt is provided on one side face of a synthetic resin non-woven cloth having a moisture-permeable waterproof property so as to form a lattice or to be dotted at every appropriate distance in both lengthwise and breadthwise directions. The moisture- permeability stipulated in JIS Z 0208 is made 3000g/m<2> .24h or higher. A preventive processing against adhesion like lamination of a release paper is applied on the surface of adhesive coating layer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a moisture permeable waterproof sheet having a nail hole sealing property used for the construction of roofs, walls, etc. of buildings.

[0002]

2. Description of the Related Art
Asphalt-based waterproofing materials have been widely used as underwater waterproofing materials for roofs and walls of buildings. However, in recent years, improvement of habitability of houses and the like has been demanded, air-conditioning and heating equipment has spread, and along with this, heat insulation structure of buildings has been advanced, and airtightness of houses has been enhanced. For this reason, when an asphalt-based waterproof material is used, it has a waterproof property, but since it has almost no moisture permeability for allowing moisture and water vapor to pass through, it has a drawback that dew condensation occurs inside the building and the base material is easily corroded.

Therefore, as a waterproof material having moisture permeability, for example, a non-woven fabric made of a polyolefin-based ultrafine fiber layer has come to be used. However, since it is nailed to a base material such as a pier at the time of construction, this is caused. There is a drawback that water easily enters through the nail holes.

In addition, in Japanese Utility Model Publication No. 1-80330, 0.
A construction waterproofing material is described in which an ultrafine fiber non-woven fabric made of a polyolefin of 1 denier or less and a dry non-woven fabric made of a synthetic fiber of 0.5 denier or more are laminated. According to this description, by positioning a thick denier non-woven fabric having water retention or water permeability on the base material side, a small amount of rainwater flowing in from the nail holes is absorbed and diffused into the non-woven fabric and rainwater to the base material is absorbed. It is said that infiltration can be reduced.
However, this method cannot prevent the infiltration of rainwater into the base material when a large amount of rainwater flows in from the nail holes, and is not a preferable method.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art. One side surface of a synthetic fiber nonwoven fabric having moisture permeability and waterproofness is waterproof and nail holes are provided. A coating layer having a sealing property is partially provided, and the moisture permeability specified in JIS Z 0208 is 300.
It is a moisture-permeable waterproof sheet with a weight of 0 g / m ² · 24 h or more.

The synthetic fiber nonwoven fabric having moisture permeability and waterproof property used in the present invention is a sheet (or film) made of ultrafine fibers such as polyethylene, polypropylene, polyethylene terephthalate, polyamide, polyvinyl chloride, polytetrafluoroethylene and polyurethane. Examples thereof include those made of polyethylene or polypropylene, from the viewpoints of spinnability and water repellency, and particularly a small contact angle with water. The unit weight of the non-woven fabric made of these ultrafine fibers is usually preferably about 40 to 200 g / m ² . When the basis weight is less than 40 g / m ² , the moisture permeability is excellent, but the water resistance tends to decrease and the waterproofness tends to deteriorate.
On the other hand, when the weight per unit area exceeds 200 g / m ² , the waterproof property is excellent, but the moisture permeability gradually decreases, and the weight increases to deteriorate the workability, and the cost tends to be more expensive. .

Examples of the material for forming the coating layer having the waterproof property and the nail hole sealing property used in the present invention include various rubbers such as asphalt, rubber asphalt, non-vulcanized type and vulcanized type.

Asphalt is JIS K 22
The blown asphalt and the asphalt for waterproofing work specified in No. 07 can be used, and those obtained by adding an inorganic filler such as talc or calcium carbonate, a process oil, a softening agent such as petroleum resin can also be used. It is convenient to use these additives because the penetration and softening point of the asphalt composition can be adjusted appropriately.

As the rubber asphalt, mainly straight asphalt, natural rubber and synthetic rubber such as polybutadiene rubber, polyisoprene rubber, chloroprene rubber, styrene / butadiene block copolymer rubber,
Of styrene / isoprene block copolymer rubber, etc.,
One type or a plurality of types of rubbers are mixed, and usually 3 to 20 parts by weight of 100 parts by weight of asphalt are mixed and used. Furthermore, inorganic fillers, process oils and the like can be added to these rubber asphalts, if necessary.

Examples of the non-vulcanizable rubber include butyl rubber, chloroprene rubber and natural rubber.
Butyl rubber is preferably used because of its excellent water resistance and processability.

As the vulcanizable rubber, chloroprene rubber, ethylene / propylene / non-conjugated diene terpolymer rubber, and the terpolymer rubber may be butyl rubber, polybutadiene rubber, styrene / butadiene rubber, natural rubber. Examples thereof include those modified by blending any of the above.

As described above, various materials can be used as the coating layer having waterproof property and nail hole sealing property, but rubber asphalt, which is particularly excellent in nail hole sealing property and workability, is used. Optimal.

The thickness of the coating layer having a waterproof property and a nail hole sealing property is slightly different depending on its material, but is usually 0.4.
mm to about 1 mm. For rubber asphalt and non-vulcanized butyl rubber, 0.4 mm or more, and for vulcanized EPT butyl rubber, 0.5 mm or more. If it is smaller than this, it is too thin and the nail hole sealing property tends to be insufficient. On the other hand, even if a coating layer of more than 1 mm is provided, it does not affect the nail hole sealability,
On the contrary, it becomes expensive and uneconomical.

In the present invention, the coating layer having waterproofness and nail hole sealing property is partially provided on one side surface of the synthetic fiber nonwoven fabric having moisture permeability and waterproofing property. There is a method in which the coating layer of (1) is provided in the longitudinal direction and the width direction of the synthetic fiber non-woven sheet to form a lattice. When the construction is carried out, either the vertical or horizontal strips will always be positioned on the base material such as the pier during the construction, which makes nailing easy and convenient. Further, there is a method of providing regular coating layers which are regularly or irregularly scattered at appropriate intervals in the longitudinal direction and the width direction.

When the strip-shaped coating layers are provided in a grid pattern, for example, continuous coating layers having a width of 5 cm are arranged in parallel in the longitudinal direction and the width direction of the non-woven sheet at intervals of 25 cm between the coating layers. Set up. When providing a regular coating layer,
For example, circular coating layers having a diameter of 5 cm are provided at intervals of 25 cm in the longitudinal direction and the width direction. The shape of the regular coating layer may be square, rectangular or the like other than circular, and is not particularly limited.

According to the present invention, when a coating layer having waterproofness and nail hole sealing property is provided on one side of a synthetic fiber nonwoven fabric having moisture permeability and waterproofness, the moisture permeability specified in JIS Z 0208 is 3000 g / It is essential that m ² · 24h or more. If the moisture vapor transmission rate is less than 3000 g / m ² · 24 h, it cannot be expected to completely prevent dew condensation inside the building after construction, especially in cold regions. When manufacturing the moisture-permeable waterproof sheet of the present invention, the area ratio of the coating layer to the nonwoven sheet can be calculated in advance and a nonwoven sheet having a known moisture permeability can be selected.

The coating layer having waterproofness and nail hole sealing property of the present invention has adhesiveness or non-adhesiveness, and the surface of the adhesive coating layer should be subjected to anti-adhesion treatment. is there. When the adhesiveness of the coating layer is remarkable, a release paper may be temporarily attached and the release paper may be removed at the time of construction. In addition, when the adhesiveness is low, inorganic powder particles such as silica sand and talc may be adhered and used as they are at the time of construction. Those having tackiness have an advantage that they can be easily constructed.

In order to apply the moisture-permeable waterproof sheet of the present invention, the base material such as plywood, stakes, studs, etc. is laid with the surface of the sheet provided with the coating layer facing the base material, and preferably the coating layer. Secure the seat by driving a tucker needle near the center of the. In addition, it is preferable that the sheets to be adjacent to each other be overlapped by about 10 cm, and the edge portions of the overlap be sealed with gum tape.

[0019]

In the present invention, the sheet is fixed to the base material by driving a tucker needle near the center of the coating layer having waterproofness and nail hole sealing properties during construction, so that the material forming the coating layer is formed. This completely seals around the nail axis and prevents rainwater from entering from the outside through the nail hole.

The sheet partially provided with a coating layer has a moisture permeability of 3000 according to JIS Z 0208.
Since it is g / m ² · 24h or more, for example, in a wall of a house, a heat insulating material such as glass wool is used inside the outer wall,
By providing the sheet of the present invention on the outdoor side of the heat insulating material and further providing a ventilation space on the outside thereof, moisture inside can freely pass through the sheet, and dew condensation does not occur inside the building. Absent.

[0021]

Example: The water vapor transmission rate specified in JIS Z 0208 is 4
147 g / m ² · 24 h, thickness 0.17 mm, basis weight 61 g / m ² , width 90 cm, high-density polyethylene ultrafine fiber nonwoven fabric, width 25 cm apart, width 40 cm apart in the longitudinal direction A band-shaped continuous coating layer made of rubber asphalt having a thickness of 5 cm and a thickness of 0.5 mm was formed in a grid pattern to obtain a moisture-permeable waterproof sheet. Calculating the water vapor transmission rate of the sheet after providing the coating layer is 3072 g / m ² · 24
h. When this sheet was used as an underwall material and a ventilation space was provided outside it, it was confirmed that the effect of preventing dew condensation inside the building was great.

[0022]

As described above, the moisture-permeable waterproof sheet according to the present invention has a coating layer having waterproofness and nail hole sealing property on one side of a synthetic fiber nonwoven fabric having moisture-permeable and waterproof properties. Since the sheet is fixedly installed, the sheet is fixed to the base material by driving a tucker needle near the center of the coating layer having waterproofness and nail hole sealing properties during construction, so a coating layer is formed. The material can completely seal around the nail shaft, and rainwater does not intrude through the nail hole from the outside.

The sheet partially provided with a coating layer has a moisture permeability of 3000 according to JIS Z 0208.
Since it is g / m ² · 24h or more, for example, in a wall of a house, a heat insulating material such as glass wool is used inside the outer wall,
If the sheet of the present invention is provided on the outdoor side of the heat insulating material, and if a ventilation space is appropriately provided on the outside thereof, moisture inside can freely pass through the sheet and be released to the outside. No condensation will occur on the. Therefore, it is extremely effective as a wall underlaying material or a roof underlaying material.

Claims (4)

[Claims] 1. A synthetic fiber nonwoven fabric having moisture permeability and waterproof property is partially provided with a coating layer having waterproof property and nail hole sealing property, and the moisture permeability specified in JIS Z 0208 is 3000 g / A moisture permeable waterproof sheet designed to be m ² · 24h or longer. 2. The moisture-permeable waterproof sheet according to claim 1, wherein the coating layer having the waterproof property and the nail hole sealing property is made of asphalt or rubber asphalt having a thickness of 0.4 mm or more. 3. The coating layer having waterproofness and nail hole sealing property has tackiness, and the surface of the coating layer having tackiness is subjected to anti-sticking treatment. The moisture-permeable waterproof sheet according to claim 1 or 2. 4. The coating layer having the waterproof property and the nail hole sealing property is provided in a grid pattern or in a state of being scattered at appropriate intervals in the longitudinal direction and the width direction. The moisture-permeable waterproof sheet according to claim 1, 2, or 3.