JP2010043496A - Thermal-insulating moisture-permeable waterproof sheet for construction - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a waterproof sheet for a construction having an excellent thermal insulating property, having even superior non-slip property, moisture-permeable waterproofness and cut-off property and having even surpassing workability and safety on an operation. <P>SOLUTION: In the thermal-insulating moisture-permeable waterproof sheet for a construction, a nonwoven fabric is arranged on the top face of a moisture-permeable waterproof film, resin layers are further arranged on the nonwoven fabric, a swelling layer is disposed on the underside of the moisture-permeable waterproof film and the nonwoven fabric is further disposed under the swelling layer. In the thermal-insulating moisture-permeable waterproof sheet for the construction, the resin layers are composed of a foamed resin containing powder having the thermal insulating property. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a heat-permeable moisture-permeable waterproof sheet for construction, and more specifically, it has excellent heat-shielding properties, slip-proof properties, moisture-permeable waterproof properties and water-stopping properties, and also has excellent workability and work safety. The present invention relates to a heat-permeable moisture permeable waterproof sheet.

  Conventionally, a waterproof sheet for construction has been used for the purpose of preventing moisture such as rainwater from entering a house. Examples of the waterproof sheet for building include a roof waterproof sheet disposed between a roof tile and an attic board, and a house wrap waterproof sheet attached between an exterior material and an interior material.

As a concrete example of the architectural waterproof sheet that has been used conventionally, there is asphalt felt. Asphalt felt is a waterproof sheet for construction made by impregnating non-woven fabric with asphalt, and is excellent in waterproofness and water leakage prevention from a portion where nails are driven.
However, asphalt felt is heavy and has a problem in terms of work safety, such as being easily out of balance when transported. Moreover, since it is hard and difficult to cut with a cutter or the like, there is also a problem that workability is poor.
Therefore, development of a waterproof sheet for architecture having a conventional waterproof property, lighter in weight and excellent in workability has been demanded.

In addition, these sheets are required not only to have a function of preventing rainwater from entering, but also to have a function of preventing moisture from escaping indoor water vapor.
For example, asphalt felt that has been conventionally used as a waterproof sheet for roofs is not permeable to moisture, so that it is not possible to dissipate indoor water vapor to the outside. .
Therefore, the development of materials that are waterproof and yet have moisture permeability has been promoted.

On the other hand, the waterproof sheet for construction causes artificial breakage such as hitting a nail or a tucker when it is fixed to an attic or a wall material. Moreover, holes and cracks may occur spontaneously due to disasters. The conventional architectural waterproof sheet has a drawback that rainwater enters from gaps (nail holes) and cracks around the nails.
Therefore, in addition to waterproofness, the waterproof sheet for construction is required to have a function of blocking the entry of moisture by blocking such nail holes and cracks by itself, that is, waterproofing.

In recent years, the number of cases in which a thermal barrier coating is applied to the roof of a building has been increasing from the viewpoint of enhancing the cooling effect in summer and saving energy. However, when the thermal barrier paint is applied directly to the roof or the like, it takes a lot of man-hours and there is a risk that the quality may vary depending on the skill of the craftsman. Moreover, the thing which applied the thermal-insulation coating directly on the roof etc. has the problem that the thermal-insulation effect falls by becoming dirty with rain etc., and it had to be periodically maintained.
Therefore, development of a building sheet having heat shielding properties is being promoted in terms of maintaining the simplicity of construction and the uniformity of quality.

In order to solve these problems, for example, Patent Document 1 discloses a sheet in which a low-melting point resin is coated on a back surface of an aluminum simple substance or an aluminum vapor-deposited film and a micro hole is formed, and a single piece of nonwoven cloth or a resin split cloth. A composite sheet for building materials having a heat shielding property, a heat insulating property, a moisture permeable waterproof property, and a water stopping property, which is laminated with a laminated sheet, is disclosed.
This sheet has a heat shielding property by a layer (heat shielding layer) made of aluminum alone or an aluminum deposited film on the sheet surface, and water vapor can be discharged to the outside by providing micro holes in the heat shielding layer.
However, a sheet surface made of an aluminum simple substance or an aluminum vapor deposited film is slippery due to low frictional resistance, and there is a possibility that the field of view may be blocked during the operation by reflecting visible light. For this reason, in particular, a roof waterproof sheet that needs to be ridden on the sheet is very dangerous because the safety during the operation is lowered.
In addition, there is a problem that the layer made of aluminum is easily peeled off by an external force and is inferior in durability.

JP-A-8-193390

  The present invention has been made in view of the current situation as described above, and the object of the present invention is excellent in heat shielding properties, and also has excellent slip resistance, moisture permeability and waterproof properties, and waterproof properties. It is providing the waterproof sheet | seat for construction excellent in property and work safety.

  As a result of earnest research to solve the above-mentioned problems, the present inventor has found that by providing a specific resin layer on the surface, it is possible to obtain both heat shielding properties and anti-slip properties at the same time. It came to complete a heat-permeable moisture-permeable waterproof sheet.

  That is, according to the present invention, a nonwoven fabric is disposed on the upper surface of the moisture-permeable waterproof film, a resin layer is further disposed thereon, and a swelling layer is disposed on the lower surface of the moisture-permeable waterproof film, and further the nonwoven fabric is disposed thereunder. Is a heat-insulating moisture-permeable waterproof sheet for buildings, wherein the resin layer is made of a foamable resin containing a heat-insulating powder.

  The heat-shielding powder contained in the resin layer is preferably a ceramic powder, and more preferably a titanium oxide powder having a particle size of 0.5 to 5 μm.

  Furthermore, it is preferable that the heat-insulating moisture-permeable waterproof sheet for construction of the present invention has a water repellent on the surface of the resin layer.

  According to the present invention, it is possible to provide a waterproof sheet for construction which has excellent heat shielding properties, has excellent slip resistance, moisture permeability and waterproofness, and water resistance, and also has excellent workability and work safety. it can.

Hereinafter, the present invention will be described in detail with reference to the drawings.
In this specification, the waterproof sheet for construction itself, the moisture permeable waterproof film constituting the waterproof sheet, the nonwoven fabric, etc. are placed on the horizontal surface in a state where the architectural waterproof sheet is normally used. The facing surface is referred to as the “upper surface”, and the downward facing surface is referred to as the “lower surface”.

FIG. 1 is a schematic diagram showing a cross section of a heat-insulating moisture-permeable waterproof sheet for construction in a preferred embodiment of the present invention.
The architectural heat-insulating moisture-permeable waterproof sheet 1 of the present invention basically has a triple structure of a moisture-permeable waterproof film 2, a nonwoven fabric 3 bonded to the upper surface thereof, and a nonwoven fabric 4 bonded to the lower surface of the moisture-permeable waterproof film 2. Further, a resin layer 5 is formed on the upper surface of the nonwoven fabric 3, and a swelling layer 7 is interposed between the moisture permeable waterproof film 2 and the nonwoven fabric 4.

The architectural heat-insulating moisture-permeable waterproof sheet 1 of the present invention is provided with a heat-shielding property by containing the resin layer 5 with a powder 6 having a heat-shielding property.
Here, the heat shielding property in the present invention is determined by the temperature difference between the surface temperature of the tile installed on the upper surface side of the sheet and the surface temperature on the lower surface side of the sheet in the implementation assumption test, and specifically, the tile surface temperature is 65. When it is ℃ (generally assuming the tile surface temperature in summer), when the surface temperature on the lower surface side of the sheet is 45 ° C. or less (temperature difference of 20 ° C. or more), it is determined that there is heat shielding.
Moreover, when exhibiting heat-shielding property, it is preferable that the heat-insulating moisture-permeable waterproof sheet for construction of the present invention has an infrared reflectance of 70% or more. If the infrared reflectance is less than 70%, the intended heat shielding property may not be sufficiently obtained.

Furthermore, the heat-insulating moisture-permeable waterproof sheet for construction of the present invention also has waterproofness, moisture permeability, and slip resistance, which are generally required for roof waterproof sheets and house wrap waterproof sheets.
That is, as waterproofness, it is preferable that the water pressure resistance is 30 kPa or more.
Further, as the anti-slip property, it is preferable that the resin layer 5 formed on the upper surface of the nonwoven fabric 3 also has anti-slip property, and the slip angle measured by the static friction coefficient with respect to the anti-slip surface is preferably 40 ° or more.
In addition, the moisture permeability depends on the moisture permeable waterproof film, but preferably has a moisture permeability of at least 1500 g / m ² · 24 hr.

  Next, the film, each layer, and each nonwoven fabric which comprise the heat-insulating moisture-permeable waterproof sheet | seat for construction of this invention are demonstrated.

  The moisture permeable waterproof film 2 is a film having waterproofness and moisture permeability, and guarantees waterproofness and moisture permeability as a heat insulating moisture permeable waterproof sheet for buildings.

Examples of the material of the moisture permeable waterproof film include polyethylene, polypropylene, polyurethane, polyvinyl alcohol, urethane-based thermoplastic elastomer, and the like. Among them, a microporous polyethylene film that is easy to process and particularly excellent in moisture permeability is preferably used.
At this time, the pore diameter of the microporous polyethylene film is preferably 0.5 to 5.0 μm. If the pore diameter is less than 0.5 μm, there is a risk that sufficient moisture permeability will not be obtained. If it is greater than 5.0 μm, moisture permeability will be high but water will be easily passed, and sufficient waterproofness will not be obtained. There is a fear.

  Here, the thickness of the film is preferably 40 to 100 μm. If the thickness is less than 40 μm, the strength of the film may not always be sufficient even if a nonwoven fabric is pasted on the upper and lower surfaces, and if it is thicker than 100 μm, the flexibility becomes poor as a whole. May be inferior.

  Next, the nonwoven fabric 3 adhered to the upper surface of the moisture permeable waterproof film reinforces the moisture permeable waterproof film 2 and absorbs the impact applied to the heat insulating moisture permeable waterproof sheet 1 for building to absorb heat permeable moisture for building. It plays a role of preventing damage to the waterproof sheet 1 as much as possible.

Here, the nonwoven fabric (nonwoven fabric 3 and nonwoven fabric 4) used in the present invention is preferably a nonwoven fabric having a basis weight of 10 to 100 g / m ² from the viewpoint of handleability.
Moreover, as a raw material, the synthetic fiber of a polyethylene type, a polypropylene type, a polyamide type, a polyester type, a polyvinyl chloride type, and a polyurethane type is preferable, and these can be used individually or in plurality. In addition to the synthetic fibers, cellulose-based, protein-based, other semi-synthetic fibers, regenerated fibers, and the like may be mixed.
Among these, non-woven fabrics made of polyester-based and / or polypropylene-based synthetic fibers are preferable in terms of moldability, dimensional stability, strength, durability, and the like.

  Examples of the method for producing the nonwoven fabric include a spunbond method, a chemical bond method, a thermal bond method, a needle punch method, a stitch bond method, and the like. preferable.

  Furthermore, these non-woven fabrics may be subjected to a calendar process. By applying the calendar treatment, the tensile strength, waterproofness, and heat shielding properties can be improved.

  Moreover, the resin layer 5 is formed in the upper surface of the nonwoven fabric 3, and since this resin layer 5 has heat insulation and slipperiness, the heat insulation and slipperiness of the heat insulation moisture-permeable waterproof sheet 1 for construction are ensured. Has been.

As the resin constituting the resin layer 5, a foamable resin is used, and among them, a polyamide, polyester, polyolefin, acrylic, urethane, polystyrene, or other thermally foamable resin is preferably used. By using a foamable resin, irregularities are formed on the surface of the resin layer, and the irregularities on the surface exhibit anti-slip properties. As a result, it is possible to prevent the operator from slipping not only in fine weather but also in rainy weather and work safely.
Among the heat-foamable resins, acrylic heat-foamable resins are particularly preferable from the viewpoint of processability.

Further, the resin layer 5 is required to contain a heat-shielding powder 6.
Examples of the heat-shielding powder include metal powders such as aluminum and zinc, and ceramic powders such as titanium oxide and zinc oxide. In the present invention, ceramic powders are particularly preferably used.
Unlike metal powder, which makes it difficult to exhibit a heat-shielding effect when mixed with a resin, ceramic-based powder can maintain heat-shielding properties even when mixed with a resin. In addition, the heat shielding layer using the ceramic powder does not reflect like the heat shielding layer using the metal powder, and is excellent in work safety.
Among ceramic powders, titanium oxide powder is particularly preferable from the viewpoints of high heat shielding properties, workability, low cost, and safety.

Here, the titanium oxide powder preferably has a particle size of 0.5 to 5 μm, more preferably 1 to 3 μm. When the particle size is less than 0.5 μm, the heat shielding property of the titanium oxide powder itself is lowered, and there is a possibility that sufficient heat shielding property cannot be obtained when it is contained in the resin. If the particle size is larger than 5 μm, the titanium oxide itself easily absorbs infrared rays, and the temperature of the sheet itself is likely to rise due to the heat of the titanium oxide, so that the heat shielding effect may not be obtained. .
In addition, the particle size of the titanium oxide powder in the present invention is measured by a screening test.

  The heat-shielding powder is preferably contained in a proportion of 5 to 30% by weight, more preferably 10 to 15% by weight, based on the foamable resin. When the content ratio is less than 5% by weight, there is a possibility that the desired heat shielding property cannot be obtained sufficiently when the resin layer is formed. On the other hand, if it exceeds 30% by weight, the powder mixed in the resin is difficult to uniformly disperse in the resin, which is not preferable.

As a method of mixing the heat-insulating powder with the foamable resin, a method in which the heat-shielding powder is dispersed in an aqueous solution containing a dispersant and then mixed with the resin is preferably used. By dispersing the heat-shielding powder in an aqueous solution containing a dispersant in advance, it is possible to prevent the powder from aggregating when mixed with the resin and to uniformly disperse the resin in the resin.
As the dispersant to be used, a polycarboxylic acid type is preferably used.

  The resin layer 5 is formed by applying the foamable resin containing the heat-shielding powder on the nonwoven fabric 3 in this way.

Here, the coating amount of the foamable resin containing a powder having a heat-shielding property is preferably 4~16g / ^{m 2} by dry weight, and more preferably 4~12g / ^{m 2.} If the coating amount is less than 4 g / m ² , the intended anti-slip property and heat shielding property may not be sufficiently obtained. If the coating amount is more than 16 g / m ² , the moisture permeability of the sheet is lowered and sufficient permeability is not obtained. There is a risk that wettability may not be obtained.

Examples of the application method include a coating method, a gravure roll method, a relief printing method, a screen printing method, and the like. Of these, the gravure roll method is preferably used in terms of workability.
At this time, the resin layer may be formed on the entire upper surface of the nonwoven fabric 3 as long as it does not interfere with the moisture permeability of the moisture permeable waterproof film and can exhibit heat shielding properties and slip resistance. You may form in dot shape etc. Further, the resin layer may be formed so as to provide an overlap margin at the end.

The resin layer 5 may further impart a water repellent to the surface thereof. By applying the water repellent, water drainage on the surface of the resin layer is improved, and water can be prevented from entering the building heat-permeable moisture-permeable waterproof sheet. Furthermore, since the water drainage on the surface of the resin layer is improved, the anti-slip property is further improved, and the work safety can be further improved such that it is difficult to slip even in the work after raining.
Moreover, by providing a water repellent, the resin layer is less likely to become dirty, and the antifouling property of the surface of the heat-insulating moisture-permeable waterproof sheet for building can be improved.

  Examples of the water repellent used include fluorine-based, silicone-based, wax-based, and water-based water repellents. Among these, water-based water repellents are preferably used from the viewpoint of environmental considerations.

The application amount of the water repellent is preferably ² to 7 g / m ² in terms of dry weight. Coating amount may not be able to obtain a water-repellent and therewith due to the effect the intended less than 2 g / m ^2. Moreover, when more than 7 g / m < ² >, there exists a possibility of inhibiting the moisture permeability of a moisture-permeable waterproof film.

The method for applying the water repellent is not particularly limited as long as a conventional water repellent processing method is used, but the gravure roll method is preferably used in that it has good workability and does not impede moisture permeability. .
The water repellent is applied to the resin layer 5 after laminating the nonwoven fabric 3 on which the resin layer 5 is formed, the moisture-permeable waterproof film 2 and the nonwoven fabric 4 on which the swelling layer 7 is formed. Is preferred.

  The nonwoven fabric 3 and the moisture permeable waterproof film 2 can be bonded by a conventional method such as a dry laminating method, a wet laminating method, a hot melt laminating method, or a thermal laminating method. Of these, the dry laminating method and the hot melt laminating method are preferable in terms of processability.

  The adhesive used for bonding is not particularly limited, such as a solvent-based or emulsion-based adhesive. Even in this case, as long as the adhesive does not interfere with the moisture permeability of the moisture permeable waterproof film, the adhesive may be applied to the entire bonding surface, or may be applied in a lattice shape, a dot shape, a stripe shape, or the like.

  Moreover, the swelling layer 7 is formed in the nonwoven fabric 4 adhere | attached on the lower surface of the moisture-permeable waterproof film 2, and exhibits a water stop function.

  Here, a state where the heat-insulating moisture-permeable waterproof sheet 1 for buildings of the present invention exhibits water-stopping property will be specifically described.

  The heat-insulating moisture-permeable waterproof sheet 1 for building according to the present invention allows water to pass through the sheet by the moisture-permeable waterproof film 2 having waterproofness when water is applied from above (for example, when exposed to rainwater). To prevent.

However, when the architectural waterproof sheet is actually used, it is necessary to fix it with a nail or the like. At that time, since a slight gap is generated around the nail, water enters through that portion.
By the way, even if the amount of water entering by a single rainfall is small, if the infiltration of water is repeated over a long period of time, the attic will eventually be corroded.

However, in the heat-insulating moisture-permeable waterproof sheet 1 for building of the present invention, the swelling layer 7 (more precisely, the swelling agent in the swelling layer) around the nail absorbs the invading water and swells, and the Fill the gap to prevent water from entering.
In particular, since there is a moisture permeable waterproof film on the upper surface of the swelling layer 7 and does not allow water to pass therethrough, the swelling agent in the swelling layer 7 does not inadvertently swell due to water from the upper surface, and enters from the gap around the nail. Only the swelling agent around the nail rapidly swells by absorbing the water that has been absorbed.

This function also works in the same way when the sheet is cracked, and water that has penetrated from the crack is absorbed by the swelling layer, and the swelling layer swells and closes the space inside the crack.
Thus, in the heat-insulating moisture-permeable waterproof sheet for building of the present invention, the swelling layer absorbs water and swells, and fills and closes spaces (for example, nail holes and cracks) to ensure water stoppage. .

Specifically, this water-stopping property is shown in the water permeation test (JIS A5430 5.6), after leaving for 24 hours, it does not cause water penetration (also referred to as back leakage).
That is, the heat-insulating moisture-permeable waterproof sheet for building of the present invention has a swelling layer provided under the moisture-permeable waterproof film, thereby preventing water from entering from a nail hole or the like. Does not cause.

In order to form the swelling layer 7 between the moisture permeable waterproof film 2 and the nonwoven fabric 4, it is necessary to perform the bonding before the nonwoven fabric 4 is bonded to the moisture permeable waterproof film 2.
That is, after the swelling layer 7 is formed on the upper surface of the nonwoven fabric 4, the swelling layer 7 is interposed between the moisture permeable waterproof film 2 and the nonwoven fabric 4 by being adhered to the moisture permeable waterproof film 2 via the swelling layer 7. be able to.

Here, for reference, assuming that the swelling layer is formed on the upper surface of the moisture-permeable waterproof film, that is, between the moisture-permeable waterproof film 2 and the nonwoven fabric 3, the water-stop function of the swelling layer is not necessarily effective. Does not work.
In other words, since the entire swelling layer absorbs rainwater and swells, that is, the water absorption capacity becomes saturated, contributing to the absorption of water that enters through gaps and cracks around the nail. Can not do it.

As the swelling agent used in the swelling layer, a commonly used superabsorbent polymer is used, and the kind thereof is not particularly limited.
Specific examples of the superabsorbent polymer include crosslinked polyacrylate, crosslinked polyvinyl alcohol, starch-polyacrylate, polyvinyl alcohol-polyacrylate, isobutylene-maleate, and combinations thereof. Can be adopted.

In addition, the superabsorbent polymer is fixed to the nonwoven fabric 4 using a binder. For this reason, the binder contained in the superabsorbent polymer is vinyl resin, urethane resin, silicone resin, acrylic resin, epoxy. Resin, ester resin and the like are employed. Of these, acrylic resins are preferably used from the viewpoints of ease of handling during processing and cost.
At this time, it is preferable that the mixing ratio of the acrylic resin and the superabsorbent polymer is 2 to 6 for the superabsorbent polymer with respect to 1 for the acrylic resin in a solid weight ratio.

Examples of the method for applying the superabsorbent polymer to the nonwoven fabric 4 include a coating method, a gravure roll method, a relief printing method, and a screen printing method.
Among these, the gravure roll method is more preferably employed because it can be applied to the entire surface or in a lattice shape, and can be processed according to the material of the nonwoven fabric 4 so as not to impair moisture permeability. The

  The swelling layer 7 is moisture permeable and waterproof on the lower surface of the moisture permeable waterproof film in the same manner as the nonwoven fabric 4 and the moisture permeable waterproof film 2 are bonded to the nonwoven fabric 4 having the swelling layer formed on the upper surface in this way. It is made to adhere so that it may intervene between film 2 and nonwoven fabric 4.

  Here, as with the nonwoven fabric 3, the nonwoven fabric 4 naturally plays a role of reinforcing the moisture-permeable waterproof film, preventing damage to the heat-insulating moisture-permeable waterproof sheet 1 for construction by absorbing shock, and the like.

In addition, the swelling layer absorbs moisture and swells to form a gel, resulting in slime. However, since the swelling layer itself is interposed between the moisture permeable waterproof film 2 and the nonwoven fabric 4, the gelled swelling layer is provided on the attic board. There is no direct contact with the wall material.
As described above, the nonwoven fabric 4 also has an effect of preventing the architectural heat-shielding moisture-permeable waterproof sheet itself from slipping due to the gelled swelling layer with respect to the attic board and wall material.

  The heat-insulating moisture-permeable waterproof sheet for building of the present invention may further form a slip-proof layer on the lower surface of the nonwoven fabric 4. Thereby, the slip prevention effect of the heat insulation moisture-permeable waterproof sheet | seat for construction with respect to an attic board, a wall material, etc. can be heightened more.

The anti-slip agent used for forming the anti-slip layer is not particularly limited as long as it has an anti-slip effect, and a rubber-like one or a resin is preferably used.
Specific examples include polyamide-based, polyester-based, polyolefin-based, synthetic rubber-based, acrylic-based, urethane-based, epoxy-based, and anti-slip agents such as asphalts.

For the application of the anti-slip agent to the nonwoven fabric 4, a coating method, a gravure roll method, a relief printing method, a screen printing method, or the like is employed.
The anti-slip agent may be formed on the entire lower surface of the nonwoven fabric 4 as long as it does not interfere with the moisture permeability of the moisture-permeable and waterproof film and can also exhibit anti-slip properties, and may be formed in a lattice shape or a dot shape. May be.

As described above, the heat-permeable moisture-permeable waterproof sheet for buildings according to the present invention has excellent heat-shielding properties, and is excellent in slip resistance, waterproof properties, and water-stopping properties, and also in workability and work stability. It will be.
In addition, it cannot be overemphasized that the heat-insulating moisture-permeable waterproof sheet | seat for construction concerning this invention has intensity | strength (tensile strength, tearing strength, spelling needle strength, etc.) enough to endure use as a building material.

EXAMPLES Hereinafter, although an Example is given and the heat-insulating moisture-permeable waterproof sheet | seat for construction of this invention is demonstrated in more detail, this invention is not necessarily limited to these Examples.
Moreover, the various characteristics of the heat-insulating moisture-permeable waterproof sheet for construction of the present invention were measured by the following methods.

[Heat insulation (infrared reflectance measurement)]
Using a spectrophotometer (manufactured by Shimadzu Corporation, UVPC-3100), the infrared reflectance with respect to the wavelength region of 2500 to 3000 nm on the upper surface of the test cloth was determined.
In addition, the said infrared reflectance measured the infrared reflectance for every 2 nm in the wavelength range of 2500-3000 nm, and calculated | required by the average (simple average) of each of the measurement results.

[Heat insulation (implementation test)]
A test cloth cut to 30 cm × 30 cm was placed on one side of a wooden formwork so as to sandwich the formwork, and a tile was placed on the other side. At this time, it arrange | positioned so that the upper surface side of a test piece might face a roof tile.
Next, in a thermostatic chamber set at 35 ° C., the surface of the roof tile was irradiated with a halogen lamp and the roof surface temperature was set to 65 ° C. (assuming summertime) for 1 hour. The surface temperature on the lower surface side was measured with a radiation thermometer (manufactured by Keyence Corporation, IT2-80).

[Moisture permeability]
It measured according to JIS A6111.

[Waterproof]
It measured according to JIS A6111.

[Non-slip]
Using a static friction coefficient measuring machine (Tribogear TYPE: 10 manufactured by Shinto Kagaku Co., Ltd.), the slip angle of the test cloth was measured by the following measurement method.
First, the test cloth was attached to a 100 g flat indenter so that the upper surface side of the test cloth was outside.
Next, a flat indenter with a test cloth attached was placed on the rising plate. At this time, it was installed so that the upper surface side of the test cloth and the rising plate were in contact.
The ascending plate before the measurement is in a horizontal state and tilts at the same time as the measurement is started, and the sensor attached to the planar indenter reacts at the moment when the planar indenter starts to slide, and the ascending plate stops.
The slip angle was measured by reading the tilt angle when the flat indenter began to slip.

[Waterproof]
Measured according to JIS A 5430 5.6 and the Building Research Institute Act.
First, a test cloth was placed on a plywood and a tucker or a scribing nail was driven, and an acrylic cylinder having an inner diameter of 4 cm and a height of 200 mm was placed thereon to seal the edge portion in contact with the test cloth.
Next, water was put into a cylinder up to a height of 150 mm, and after standing for 24 hours, the reduced water height was measured.

[Anti-fouling property (water repellency)]
The water repellency was measured according to JIS L 1092.

Moreover, the following intensity | strength was measured as evaluation as a construction material.
[Tensile strength]
It measured according to JIS A6111.

[Tear strength]
It measured according to JIS A6111.

[Spelling needle strength]
It measured according to JIS A6111.

[Example 1]
Titanium oxide powder (manufactured by Teika Co., Ltd., JR-1000, particle size 1 μm (error 0.1 μm or less)) is mixed with polycarboxylic acid sodium salt dispersant (San Nopco Co., Ltd., Nop Cosperth 44-C) and water, A resin liquid A was prepared by mixing with an acrylic foamable resin (manufactured by Nikka Chemical Co., Ltd., Neo Sticker-NSCL-03).

<Preparation conditions of resin liquid A>
Titanium oxide powder (Taika Co., Ltd., JR-1000) 10% by weight
Polycarboxylic acid sodium salt dispersant (manufactured by San Nopco, Nop Cosperth 44-C)
0.1% by weight
Acrylic foamable resin (manufactured by Nikka Chemical Co., Ltd., Neo Sticker-NSCL-03)
87% by weight
2.9% by weight of water

Next, the resin liquid A is applied to the upper surface of the nonwoven fabric 3 made of a polyester spunbond nonwoven fabric (Toyobo Co., Ltd., 3701B) with a basis weight of 70 g / m ^{2 so as to have} a dry weight of 8 g / m ² with a gravure roll. And dried to form a resin layer.

Next, on the upper surface of the nonwoven fabric 4 made of a polypropylene spunbonded nonwoven fabric having a basis weight of 50 g / m ² (SD0504 manufactured by Toray Industries, Inc.), an acrylic resin (manufactured by Nikka Chemical Co., Ltd., Neo Sticker WP-01) that is a superabsorbent polymer. Was applied with a gravure roll to form a swelling layer.

Moreover, the 42-micrometer polyethylene film (Yamatogawa Polymer Co., Ltd. product, YP-4400SER-1, moisture permeability 6000g / m < ² > * 24h) was used for the moisture-permeable waterproof film.

The nonwoven fabric 3 is bonded to the moisture permeable waterproof film by a dry lamination method so that the resin layer is on the upper surface, and the nonwoven fabric 4 is hot melt laminated so that the swelling layer is interposed between the moisture permeable waterproof film. Bonding was performed by the method, and the heat-insulating moisture-permeable waterproof sheet for construction of Example 1 was obtained.
Table 1 shows the evaluation results for the sheet of Example 1.

[Example 2]
In the sheet of Example 1, the construction of Example 2 was carried out in the same manner as in Example 1 except that the resin layer surface was coated with a water repellent having the following formulation so that the dry weight was 3 g / m ^2. A heat-permeable moisture-permeable waterproof sheet was obtained.

<Water repellent formulation>
Water repellent (Nikka Chemical Co., Ltd., NK Guard NDN7E) 9% by weight
Water repellent (TH-44, manufactured by Nikka Chemical Co., Ltd.) 3% by weight
Cross-linking agent (manufactured by Nikka Chemical Co., Ltd., NK guard) 1% by weight
Water remaining

Table 1 shows each evaluation result for the sheet of Example 2.

[Comparative Example 1]
Acrylic foamable resin (manufactured by Nicca Chemical Co., Neo sticker NSBK-01) only, basis weight 90 g / ^{m 2} polyester spun bond nonwoven fabric (manufactured by Toray Industries, Inc., Axtar G2055-1S) on the upper surface of the nonwoven fabric 3 made of The sheet of Comparative Example 1 was obtained in the same manner as in Example 1 except that the resin layer was formed by applying a gravure roll to a dry weight of 8 g / m ² and drying.
Table 1 shows each evaluation result for the sheet of Comparative Example 1.

[Comparative Example 2]
Asphalt roofing (asphalt roofing 940 defined in JIS A 6005), which is a conventional waterproof sheet for roofs, was used.
Table 1 shows each evaluation result for the sheet of Comparative Example 2.

[Evaluation]
The sheets obtained in Examples 1 and 2 were lightweight, had high infrared reflectivity, and exhibited excellent heat shielding properties even in an assumed construction test. Furthermore, it was excellent also in moisture permeability, waterproofness, slip resistance, and water stoppage.
Regarding water-stopping, in the above experiment, water reduction of 1.2 mm was observed with the tucker and 8 mm with the scribing nail in Example 1, but the bottom surface of the test cloth, particularly around the portion where the tucker or nail was driven, was confirmed. In both cases, it was confirmed that no water breakthrough occurred. In addition, it was confirmed that no breakthrough of water occurred in Example 2 as well.
Furthermore, the sheets of Examples 1 and 2 had a strength (tensile strength, tear strength, spelling needle strength) that could sufficiently withstand use as a building material.
In addition, Example 2 also had high water repellency, and therefore excellent antifouling properties.

On the other hand, Comparative Example 1 did not have the intended heat shielding properties.
Moreover, the target heat-shielding property was not acquired also about the comparative example 2, and it was inferior to moisture permeability.

The schematic diagram which shows the cross section of the heat-insulating moisture-permeable waterproof sheet | seat for construction in suitable embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Heat-shielding moisture-permeable waterproof sheet for construction 2 Moisture-permeable waterproof film 3 Non-woven fabric 4 Non-woven fabric 5 Resin layer 6 Heat-insulating powder 7 Swelling layer

Claims (4)

  A non-woven fabric is arranged on the upper surface of the moisture-permeable waterproof film, a resin layer made of a foamable resin containing a heat-insulating powder is further arranged thereon, and a swelling layer is arranged on the lower surface of the moisture-permeable waterproof film A heat-permeable moisture-permeable waterproof sheet for construction, in which a non-woven fabric is further disposed below.   The architectural heat-insulating moisture-permeable waterproof sheet according to claim 1, wherein the heat-insulating powder is a ceramic powder.   The heat-insulating moisture-permeable waterproof sheet for buildings according to claim 2, wherein the ceramic powder is made of titanium oxide and has a particle size of 0.5 to 5 µm.   The heat-insulating moisture-permeable waterproof sheet for buildings according to any one of claims 1 to 3, further comprising a water repellent on the surface of the resin layer.