JP2866820B2 - Breathable 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 moisture permeable waterproof sheet having nail hole sealing properties used for construction of roofs and walls of buildings.

[0002]

2. Description of the Related Art
Asphalt waterproofing materials have been frequently used as underlay waterproofing materials such as roofs or walls of buildings. However, in recent years, improvement in the livability of houses and the like has been demanded, and cooling and heating facilities have become widespread. With this, the heat insulation structure of buildings has been advanced, and the airtightness of houses has been enhanced. For this reason, when an asphalt-based waterproofing material is used, it has a waterproof property, but has little moisture permeability that allows moisture and water vapor to pass therethrough, so that there is a drawback that dew condensation occurs inside a building and a base material is easily corroded.

[0003] Therefore, as a moisture-permeable waterproof material, for example, a nonwoven fabric made of a polyolefin-based ultrafine fiber layer has been used. However, since it is nailed to a base material such as a pier at the time of construction, it is generated by this. There is a disadvantage that water easily penetrates through the nail hole.

[0004] Japanese Utility Model Application Laid-Open No. 1-80330 discloses a method in which 0.1.
A construction waterproofing material is described in which an ultrafine nonwoven fabric made of a polyolefin of 1 denier or less and a dry nonwoven fabric made of a synthetic fiber of 0.5 denier or more are laminated. According to this description, by placing a denier thick nonwoven fabric having water retention or water permeability on the base material side, a small amount of rainwater flowing from the nail hole is absorbed and diffused into the nonwoven fabric and the rainwater on the base material is It is said that invasion can be reduced.
However, this method cannot prevent rainwater from penetrating into the base material when the amount of rainwater flowing from the nail hole is large, 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, and has waterproof and nail holes formed on one side of a synthetic fiber nonwoven fabric having moisture permeability and waterproofness. A coating layer having a sealing property is partially provided, and the moisture permeability specified in JIS Z 0208 is 300.
Made to be 0g ^/ m 2 · 24h or more, and the waterproof
Coating layer having adhesive properties and nail hole sealing properties
Or scattered at appropriate intervals in the longitudinal and width directions
It is a moisture-permeable waterproof sheet provided in a state .

The synthetic fiber nonwoven fabric having moisture permeability and waterproofness 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. However, it is preferable to use those made of polyethylene or polypropylene from the viewpoint of spinnability and water repellency, particularly a small contact angle with water. Usually, the weight per unit area of the nonwoven fabric made of these ultrafine fibers is 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 be low and the waterproofness tends to be poor.
On the other hand, if the basis weight exceeds 200 g / m ² , the waterproofness is excellent, but the moisture permeability gradually decreases, the weight increases, the workability deteriorates, and the cost tends to be relatively high. .

Examples of the material for forming the coating layer having waterproofness and nail hole sealing properties used in the present invention include asphalt, rubber asphalt, various types of non-vulcanized and vulcanized rubber.

[0008] Asphalt, JIS K22
Blown asphalt and asphalt for waterproofing work specified in No. 07, and those obtained by adding an inorganic filler such as talc or calcium carbonate, a process oil, or a softening agent such as a petroleum resin can also be used. The use of these additives is advantageous because the penetration and softening point of the asphalt composition can be appropriately adjusted.

The rubber asphalt includes mainly straight asphalt, natural rubber and synthetic rubber such as polybutadiene rubber, polyisoprene rubber, chloroprene rubber, styrene-butadiene block copolymer rubber,
Among styrene / isoprene block copolymer rubbers, etc.
Although what mixes any 1 type or multiple types of rubber is mentioned, Usually, it mixes and uses 3-20 weight part with respect to 100 weight part of asphalts. Further, an inorganic filler, a process oil, and the like can be added to these rubber asphalts as needed.

[0010] Examples of the non-vulcanized rubber include butyl rubber, chloroprene rubber, and natural rubber.
It is preferable to use butyl rubber in terms of excellent water resistance, workability, and the like.

Examples of the vulcanizable rubber include chloroprene rubber, ethylene / propylene / non-conjugated diene terpolymer rubber, and terpolymer rubbers such as butyl rubber, polybutadiene rubber, styrene / butadiene rubber, and natural rubber. And the like, which are modified by blending any of them.

As described above, various materials can be used as the coating layer having waterproofness and nail hole sealing property, and it is particularly preferable to use rubber asphalt having excellent nail hole sealing property and workability. Optimal.

The thickness of the coating layer having a waterproof property and a nail hole sealing property is slightly different depending on the material, but is usually 0.4
mm to about 1 mm. The thickness is preferably 0.4 mm or more for rubber asphalt or non-vulcanized butyl rubber, and 0.5 mm or more for vulcanized EPT butyl rubber. If it is smaller than this, the nail hole sealing property tends to be insufficient because it is too thin. On the other hand, even if a coating layer exceeding 1 mm is provided, there is no effect on nail hole sealing properties,
On the contrary, the cost is high, which is uneconomical.

In the present invention, the coating layer having waterproofness and nail hole sealing property is partially provided on one side of a synthetic fiber nonwoven fabric having moisture permeability and waterproofness. Is provided in the longitudinal direction and the width direction of the synthetic fiber non-woven fabric sheet, respectively, to form a coating. By forming a lattice shape, at the time of construction, either a vertical or horizontal band-shaped portion is always located on a base material such as a pier, so that nailing is easy and convenient. In addition, there is a method in which regular coating layers are provided regularly or irregularly at regular intervals in the longitudinal direction and the width direction, and the like.

When the strip-shaped coating layers are provided in a grid pattern, for example, continuous coating layers having a width of 5 cm are formed in parallel with each other in the longitudinal direction and the width direction of the nonwoven fabric sheet with a spacing of 25 cm between the coating layers. Provided. When providing a standard coating layer,
For example, a circular coating layer having a diameter of 5 cm is provided at intervals of 25 cm in the longitudinal direction and the width direction. The shape of the fixed coating layer may be a square, a rectangle, or the like in addition to a circle, and is not particularly limited.

In the present invention, the moisture permeability specified in JIS Z 0208 when a coating layer having a waterproof property and a nail hole sealing property is provided on one side of a synthetic fiber nonwoven fabric having a moisture permeability and a waterproof property is 3000 g /. It is important that the length is at least m ² · 24 h. If the water 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. In producing the moisture-permeable waterproof sheet of the present invention, the area ratio of the coating layer to the nonwoven sheet is calculated in advance, and a nonwoven sheet having a known moisture permeability can be selected.

The coating layer having waterproofness and sealing property for nail holes according to 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. If the adhesiveness is low, inorganic powders such as silica sand and talc may be dispersed and used as it is at the time of construction. Those having adhesiveness have an advantage of being easy to construct.

In order to construct the moisture-permeable waterproof sheet of the present invention, the surface provided with the coating layer of the sheet is laid on the base material such as plywood, pier, stud, etc., facing the base material. Hit the tucker needle near the center of the to fix the sheet. It is preferable that adjacent sheets are overlapped with each other by about 10 cm, and the edge of the overlap is sealed with a gum tape.

[0019]

According to 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 property 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 outside through the nail hole.

The sheet provided with the coating layer partially has a moisture permeability defined by JIS Z 0208 of 3000.
Since in g / m 2 ^· 24h or more, for example, in the wall of the house, a heat insulating material such as glass wool on the outer wall inwardly used,
If the sheet of the present invention is provided on the outdoor side of the heat insulating material and a ventilation space is further provided outside, the moisture inside can freely pass through the sheet, and dew condensation inside the building can be prevented. Absent. Moreover, it has waterproofness and nail hole sealing
Coating layer in a grid or in the longitudinal and width directions.
Since it was provided in a state where it was scattered at appropriate intervals, nailing
Easy to change.

[0021]

[Embodiment] The moisture permeability specified in JIS Z 0208 is 4
147 g / m ² · 24 h, high-density polyethylene ultrafine nonwoven fabric having a thickness of 0.17 mm, a basis weight of 61 g / m ² and a width of 90 cm, and a width of 25 cm in the width direction and a width of 40 cm in the longitudinal direction. A band-like continuous coating layer of rubber asphalt having a thickness of 5 cm and a thickness of 0.5 mm was formed in a lattice shape to obtain a moisture-permeable waterproof sheet. The moisture permeability of the sheet provided with the coating layer is calculated to be 3072 g / m ² · 24
h. When this sheet was used as a wall underlaying material and further provided with a ventilation space outside thereof, it was confirmed that the sheet had a large effect of preventing dew condensation inside the building.

[0022]

As described above, the moisture-permeable waterproof sheet according to the present invention has a waterproof and nail-sealing coating layer on one side of a synthetic fiber nonwoven fabric having moisture-permeable and waterproof properties. Since the sheet is fixed, 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 property at the time of construction, so that the coating layer is formed. The sealing material can be completely sealed around the nail axis, so that rainwater does not penetrate from the outside through the nail hole.

The sheet provided with the coating layer partially has a moisture permeability defined by JIS Z 0208 of 3000.
Since in g / m 2 ^· 24h or more, for example, in the wall of the house, a heat insulating material such as glass wool on the outer wall inwardly used,
If the sheet of the present invention is provided on the outdoor side of the heat insulating material and a ventilation space is appropriately provided outside the sheet, moisture inside can be freely discharged through the sheet and discharged to the outside. No dew condensation occurs. Moreover, waterproof and
Coating layer having nail hole sealing properties, in a grid, or
State scattered at appropriate intervals in the longitudinal and width directions
Since it is provided, nailing is easy and convenient. Therefore, it is extremely effective as a wall underlaying material or a roof underlaying material.

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) E04B 1/66 B32B 5/14 B32B 11/10 E04D 5/10

Claims (3)

(57) [Claims] 1. A coating layer having waterproof and nail hole sealing properties is partially provided on one side of a synthetic fiber nonwoven fabric having moisture permeability and waterproofness, and a moisture permeability specified in JIS Z0208 is 3000 g / m2. made to be ² · 24h or more, and a coating covering layer having the waterproof property and nail hole sealability
In a grid or in the longitudinal and width directions as appropriate
A moisture-permeable waterproof sheet , which is provided in a state of being scattered . 2. The moisture-permeable waterproof sheet according to claim 1, wherein the coating layer having waterproofness and 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 a waterproof property and a nail hole sealing property has an adhesive property, and the surface of the adhesive coating layer is subjected to an anti-adhesion treatment. The moisture-permeable waterproof sheet according to claim 1 or 2.