JP2006328879A - Moisture-permeable waterproof sheet for building material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a durable moisture-permeable waterproof sheet for a construction material which has both waterproof and moisture permeable properties, excels in workability by which a gap is not formed between a nail and the sheet when the nail is driven, for example, provides a non-slip surface ensuring safety of work, and excels in strength against scratching, and in heat resistance. <P>SOLUTION: In the moisture-permeable waterproof sheet 1 for a building material, whose two surfaces are protected, nonwoven fabrics 2, 3 are integrated with both surfaces of a porous synthetic resin sheet 4 by the intermediary of an adhesive resin layer 5. In making the waterproof sheet 1, the moisture-permeable adhesive resin layer 5 is prepared by melting and extruding thermoplastic resin in a form of a line in one process by using an extruding machine, whereby an excellent adhesion property being adhesive to the nonwoven fabrics 2, 3 on both faces can be obtained, waterproof property and moisture-permeability are obtained, and comfortable humidity inside a house is secured. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to a moisture permeable waterproof sheet for building materials having waterproofness, moisture permeability and slip resistance used as a roof base material.

Conventionally, as a roof base material of a house, it has waterproofness, good dimensional stability, large physical strength, non-slip, good nail hole sealability around the nail axis when hitting a nail, etc. For reasons, asphalt-impregnated fabrics were often used.

However, since the asphalt-impregnated fabric is impregnated with asphalt, a roll of about 20 m has a weight exceeding 30 kg, and the handleability during construction is very poor. Moreover, since there is almost no moisture permeability, the moisture in the lower part of the roof after construction does not escape and the base plate is easily damaged. In addition, the asphalt-impregnated fabric is deteriorated and stretched due to the temperature difference between the temperature and the temperature after construction, and there is a problem that the nail hole sealability around the nail axis and the tucker portion is lowered.

Further, paper, fiber woven fabric, non-woven fabric, synthetic resin sheet, or a composite material thereof has been used as a roof base material with improved moisture permeability. Nonwoven fabrics have heat retention, moisture permeability, soundproofing and buffering effects, and synthetic resin sheets are excellent in waterproofing effects, so they may be used in combination. Patent Document 1 discloses a roof base material having excellent waterproof properties in which a resin having stretchability and adhesiveness is applied to the surface of a fabric, and an adhesive resin is further applied thereon.

However, the roof base material using a composite material of the above-mentioned nonwoven fabric and synthetic resin sheet has a problem that the synthetic resin sheet is exposed on one side, and the waterproofness, which is the original basic function, is impaired due to scratches or the like. Yes. Moreover, there is still room for improvement in the sealing performance of the nail holes when nails are struck, and there is also a problem that it is difficult to work safely due to the slipperiness of the surface of the synthetic resin sheet. Furthermore, there is a problem that the temperature of the synthetic resin sheet rises due to direct sunlight in summer and the roof is shifted due to softening.

Further, in Patent Document 2, a polymer film containing water-impermeable chlorine having vents on both sides of a water-repellent and moisture-permeable film, and a breathable and buffering structure on the other side. Although the composite waterproof sheet for civil engineering is disclosed, when used as a base material, the film will not be damaged by the state of the surface of the covered ground board, etc., but the manufacturing process is complicated and the resin drying time is twice In other words, a long manufacturing time and an expensive manufacturing cost are required.
JP-A-2-269277 Japanese Patent Laid-Open No. 9-291657

The present invention has been made in view of such background art, has both waterproof and moisture-permeable properties, and has excellent nail hole sealing performance that does not cause a gap between a nail and a sheet, for example, even when hitting a nail, An object of the present invention is to provide a durable moisture permeable waterproof sheet for building materials that has a non-slip surface, can be safely operated, is resistant to damage, and has excellent heat resistance.

As a result of intensive studies to solve such problems, the present inventors have found that a nonwoven fabric is integrated on both sides of a porous synthetic resin sheet via an adhesive resin layer and both sides are protected for building materials. In creating a moisture waterproof sheet, the adhesive resin layer is composed of a moisture permeable thermoplastic resin melt-extruded linearly by an extruder, thereby exhibiting excellent waterproofness and moisture permeability. The present inventors have found that a moisture-permeable waterproof sheet for building materials that can ensure a comfortable humidity can be obtained. It was also found that a moisture-permeable waterproof sheet for building materials that is economically superior can be obtained by laminating a porous synthetic resin sheet and a nonwoven fabric on both sides in a single processing step.

That is, the present invention provides the following means.

[1] A moisture-permeable waterproof sheet for building materials in which a porous polyolefin film having waterproofness and moisture permeability is the center, and a nonwoven fabric for protecting the porous polyolefin film is laminated on both surfaces thereof. The anti-slip layer is provided on the upper surface which is the outermost layer after lamination, and the non-woven fabric on the inner layer side of the other layer is provided with a swelling layer formed of a highly water-absorbing polymer on the upper surface which becomes an adhesive surface with the porous polyolefin film, A moisture-permeable waterproof sheet for building materials, wherein three layers of the porous polyolefin film, the outer nonwoven fabric and the inner nonwoven fabric are laminated via an adhesive resin layer made of a thermoplastic resin.

[2] In the moisture permeable waterproof sheet for building materials in which nonwoven fabrics are laminated on both surfaces of the porous polyolefin film, the moisture permeability after lamination and integration is 800 g / m ² · 24 hr or more and the waterproof property is 2,000 mm or more. The moisture-permeable waterproof sheet for wet building material as described in the above item [1].

[3] The above-mentioned item [1], wherein the porous polyolefin film is composed of a microporous film of at least one thermoplastic elastomer selected from polyethylene and polypropylene having a moisture permeability of 1000 g / m ² · 24 hr or more. ] Or the moisture-permeable waterproof sheet for building materials according to [2].

[4] The previous item, wherein the non-woven fabric laminated on the outer layer surface of the porous polyolefin film is made of a non-woven fabric composed of at least one synthetic resin selected from polyester and polypropylene, and has an anti-slip layer on the upper surface. [1] The moisture-permeable waterproof sheet for building materials according to any one of [3].

[5] The swelling layer in which the nonwoven fabric laminated on the inner layer surface of the porous polyolefin film is made of a nonwoven fabric composed of at least one synthetic resin selected from polyester and polypropylene, and the upper layer is mixed with a superabsorbent polymer and a binder. The moisture-permeable waterproof sheet for building materials according to any one of [1] to [4], wherein 10 to 50 g / m ^{2 is} applied.

[6] The adhesive resin layer is made of at least one thermoplastic olefin resin selected from polyethylene and polypropylene, and has a coating amount of 50 to 300 g / m ² and is melt-extruded linearly by an extruder. The moisture-permeable waterproof sheet for building materials according to any one of [1] to [5] above.

[7] A T-die extruder that puts a thermoplastic resin on the overlapping surface immediately before the nonwoven fabric having the swelling layer that is continuously supplied and the nonwoven fabric having the porous polyolefin film and the anti-slip layer are superimposed. The non-woven fabric having the swollen layer and the non-slip layer having the anti-slip layer are pressure-cooled by melt-extrusion in a single row or a plurality of rows, and the non-woven fabric having the swollen layer is bonded with the thermoplastic resin. In addition, the nonwoven fabric having the anti-slip layer is melted by partially melting the porous polyolefin film by heat at the time of processing the adhesive resin layer to form an adhesive resin layer. A method for producing a moisture-permeable waterproof sheet for building materials, which is bonded and integrated in the process.

According to the invention of [1], the moisture-permeable waterproof sheet for building material of the present invention is formed by laminating a nonwoven fabric on both surfaces of the porous polyolefin film, so that the nonwoven fabric becomes a protective material, and during construction of the moisture-permeable waterproof sheet for building material, After construction, the inner layer side will not be damaged by the state of the ground plate, the outer layer side will not be damaged due to damage etc. The basic waterproof function is not impaired, and the slippery layer on the upper surface will prevent slipping and work safely In addition, the water-absorbing polymer swells and closes the gap when the water infiltrates into the gap formed between the nail nailed at the time of construction and the moisture-permeable waterproof sheet for building material due to the swelling layer formed of the superabsorbent polymer. It becomes a moisture-permeable waterproof sheet for building materials having excellent nail hole sealing performance. Further, the porous polyolefin film, the outer layer-side nonwoven fabric, and the inner layer-side nonwoven fabric are laminated through an adhesive resin layer composed of a single layer of thermoplastic resin, so that sufficient durability and economy can be obtained. It becomes a moisture-permeable waterproof sheet for building materials that can achieve a workability.

According to the invention of [2], the moisture permeable waterproof sheet for building material of the present invention has a moisture permeability of at least 800 g / m ² · 24 hr measured based on the method defined in ASTM E-96 after being laminated and integrated. Moreover, since the waterproofness measured based on JIS L1092 is 2,000 mm or more, moisture inside the house is released outside to prevent condensation, and waterproofness prevents rainwater from entering the roof, It is possible to prevent corrosion of the base plate and the rafters, and to prevent a rainwater leakage accident, and it becomes a moisture-permeable waterproof sheet for building materials that can be suitably used as a roof base material.

According to the invention of [3], the porous polyolefin film located at the center of the moisture permeable waterproof sheet for building materials of the present invention is at least one selected from polyethylene and polypropylene having a moisture permeability of 1000 g / m ² · 24 hr or more. By being composed of a microporous film of thermoplastic elastomer, both moderate waterproof and moisture permeability properties are maintained, and when the nail is struck by the elasticity of polyolefin film, it occurs between the nail and the film The function to fill the gap works, and it becomes a moisture permeable waterproof sheet for building materials that exhibits high nail hole sealing performance.

According to the invention of [4], the nonwoven fabric on the outer layer side constituting the moisture permeable waterproof sheet for building materials of the present invention is centered from the outside impact or the like while maintaining appropriate moisture permeability by the fiber structure having voids. Since the porous polyolefin film located in the region can be protected and is composed of at least one synthetic resin selected from polyester and polypropylene, it becomes a moisture-permeable waterproof sheet for building materials that can be recycled after use.

According to the invention of [5], the inner layer-side nonwoven fabric constituting the moisture-permeable waterproof sheet for building material of the present invention is a porous polyolefin located in the center while maintaining appropriate moisture permeability due to the fiber structure having voids. It is possible to prevent the film from being damaged by the state of the base plate at the time of construction, and since it is composed of at least one synthetic resin selected from polyester and polypropylene, it can be recycled after use, and the swelling formed by a highly water-absorbing polymer Due to the effect of applying 10 to 50 g / m ^{2 of the} layer, a moisture-permeable waterproof sheet for building materials having excellent nail hole sealing properties is obtained.

According to the invention of [6], the adhesive resin layer constituting the moisture-permeable waterproof sheet for building material of the present invention is made of at least one thermoplastic olefin resin selected from polyethylene and polypropylene, and the coating amount is 50 to 300 g. / M ² , which maintains moderate moisture permeability, exhibits good adhesion, and has a durable construction material permeability that prevents the nonwoven fabric serving as a protective material from the porous polyolefin film from shifting over a long period of time. It becomes a moisture waterproof sheet. Also, in addition to the nail hole sealing property of the porous polyolefin film, when the nail is struck by the elastic force of the thermoplastic olefin resin, it functions to fill a gap formed between the nail and the film. It becomes a moisture-permeable waterproof sheet for building materials that exhibits higher nail hole sealing performance.

According to the invention of [7], a thermoplastic resin is melt-extruded into a single row or a plurality of rows in a T-die type extruder, and the nonwoven fabric having the swelling layer on the porous polyolefin film is converted into the thermoplastic resin. The non-woven fabric having the anti-slip layer is partially melted by the heat during processing of the adhesive resin layer to partially melt the porous polyolefin film to form an adhesive resin layer, and is laminated on the porous polyolefin film, leaving moisture permeability. By manufacturing a laminated sheet in which three layers are bonded and integrated in a single step without requiring a plurality of steps, the manufacturing method of a moisture permeable waterproof sheet for building materials is remarkably streamlined.

Hereinafter, an embodiment of a moisture permeable waterproof sheet for building materials according to the present invention will be described with reference to the drawings. The moisture-permeable waterproof sheet for building materials of this embodiment is a moisture-permeable waterproof sheet for building materials used especially as a roof substrate material regarding a building foundation material. Drawing 1 is a typical sectional view expanding and showing a part of moisture-permeable waterproof sheet for building materials of this embodiment.

The non-woven fabric (2) on the outer layer side in the present invention reinforces the porous polyolefin film (4) and absorbs the impact applied to the moisture permeable waterproof sheet for building materials to prevent damage to the moisture permeable waterproof sheet for building materials as much as possible. , Play a role to prevent. About the form of the nonwoven fabric used here, the spun bond and needle punch which consist of synthetic fibers, such as polyester and a polypropylene, are preferable. The nonwoven fabric preferably has a cotton basis weight of 30 to 100 g / m ^2, and the porous polyolefin film (4) is exposed and damaged due to scratches or the like during construction, and the waterproofness, which is the original basic function, is impaired. It becomes a moisture-permeable waterproof sheet for building materials that is lightweight and has excellent heat insulation, soundproofing and cushioning properties.

Further, an anti-slip layer (7) is formed on the upper surface of the non-woven fabric (2) on the outer layer side, and the anti-slip agent is preferably non-slip and non-sticky, such as rubber or resin. . Specific examples include polyamide, polyester, polyolefin, synthetic rubber, acrylic, urethane, epoxy, and asphalt. In order to further increase the anti-slip effect, organic and inorganic foaming agents are added. Further, the entire surface coating of the anti-slip agent maintains moisture permeability, exhibits excellent anti-slip properties, and is a non-slip moisture permeable waterproof sheet for building materials for safe work.

Examples of the method for applying the anti-slip agent include a coating method, a gravure roll method, a relief printing method, and a screen printing method. The application area of the anti-slip agent may be the entire surface or the minimum area where the anti-slip effect is exhibited as long as the air permeability is not impaired.

The non-woven fabric (3) on the inner layer side in the present invention, like the non-woven fabric (2) on the outer layer side, reinforces the porous polyolefin film and absorbs the impact applied to the moisture permeable waterproof sheet for building materials. It plays the role of preventing damage to the moisture permeable waterproof sheet as much as possible. About the form of the nonwoven fabric used here, the spun bond and needle punch which consist of synthetic fibers, such as polyester and a polypropylene, are preferable. Further, the nonwoven fabric has a weight per unit area of preferably 30 to 100 g / m ² , and the porous polyolefin film (4) is not damaged by the state of the base plate during construction, and is lightweight and moisture-permeable for building materials having excellent heat insulation, soundproofing and buffering properties. It becomes a waterproof sheet.

Further, a swollen layer (8) made of a superabsorbent polymer and a binder is formed on the upper surface of the non-woven fabric (3) on the inner layer side which is to be bonded to the porous polyolefin film (4). As the swelling agent for forming the swelling layer, a highly water-absorbing polymer which is a polymer compound having a water-absorbing performance is used, and the kind thereof is not particularly limited. Specific examples of the superabsorbent polymer include polyacrylate cross-linked products, starch-polyacrylate, polyvinyl alcohol-polyacrylate, isobutylene-maleate, and the like. May be used.

The superabsorbent polymer is fixed to the upper surface of the inner nonwoven fabric (3) using a binder. As the binder, vinyl resin, urethane resin, silicon resin, acrylic resin, epoxy resin are used. An ester resin or the like is employed. Among these, acrylic resins are more preferably used from the viewpoint of good handling and cost during processing. In this case, the ratio of the acrylic resin and the superabsorbent polymer is preferably a ratio of 2 to 6 superabsorbent polymer with respect to 1 in the solid weight ratio.

The adhesion amount of the superabsorbent polymer is 10 to 100 g / m ² , more preferably 20 to 80 g / m ² . When the adhesion amount is less than 10 g / m ² , the nail hole sealing property is insufficient, and when it is more than 100 g / m ² , the moisture permeability is impaired.

Examples of the method for applying the non-woven fabric (3) on the inner layer side of the swelling layer include a coating method, a gravure roll method, a relief printing method, and a screen printing method. Among them, the gravure roll method is more preferably employed because it can be applied to the entire surface or applied in a lattice shape, and can be processed according to the material of the fabric so that the air permeability is not impaired.

Examples of the porous polyolefin film (4) in the present invention include at least one thermoplastic elastomer selected from polyethylene and polypropylene, but a microporous polyethylene film having good workability and high moisture permeability is preferably used. .

The waterproof property of the moisture permeable waterproof sheet for building materials depends on the porous polyolefin film, but if the waterproof property of the porous polyolefin film is 2,000 mm or more, the waterproof property of the moisture permeable waterproof sheet for building materials is 2,000 mm or more can be secured. As a result, it becomes a moisture-permeable waterproof sheet for building materials that can prevent intrusion of rainwater even if it is exposed to wind and rain. Further, the moisture permeability of the waterproof sheet for construction depends on the moisture permeable waterproof film, but if the moisture permeability of the porous polyolefin film is 800 g / m ² · 24 hr or more, the moisture permeability of the moisture permeable waterproof sheet for building materials is 800 g. / M ² · 24 hr or more can be ensured, and the moisture permeable waterproof sheet for building materials can maintain a comfortable room without causing condensation in the room.

In addition, the thickness of the porous polyolefin film is 30 μm or more in order to exert an elastic force to fill a gap generated between the nail and the film by the nail struck during construction and to obtain a good nail hole sealing property Are preferred. More preferably one having 1 to 30 kg / mm ² as a Young's modulus of the porous polyolefin film, more preferably has from the point of the nail hole sealability and handling of 20-30 kg / mm ^2.

The adhesive resin layer (5) constituting the moisture permeable waterproof sheet for building materials of the present invention is made of at least one thermoplastic olefin resin selected from polyethylene and polypropylene, and can further improve the adhesive strength and from the viewpoint of recycling. A polyethylene resin is preferably used. The amount of the thermoplastic resin applied to the adhesive resin layer (5) is preferably 50 to 300 g / m ² , and the thermoplastic resin melt-extruded linearly by an extruder becomes an air-permeable adhesive resin layer and is made of a porous polyolefin film. The outer nonwoven fabric (2) and the inner nonwoven fabric (3) are bonded and integrated on both sides. Furthermore, the coating amount is preferably 100 to 200 g / m ² .

Further, when the coating amount is 50 to 300 g / m ² , the elastic force to fill the gap generated between the nail and the film by the struck nail is exhibited, and good nail hole sealing performance is obtained. It is done.

Furthermore, the melt flow rate of the thermoplastic resin of the adhesive resin layer (5) is preferably 1 to 100. If the melt flow rate is less than 1, it is difficult to apply uniformly. If the melt flow rate exceeds 100, the resin is easily impregnated into the nonwoven fabric (3) on the inner layer side and the porous polyolefin film (4), and an adhesive resin layer cannot be formed. Extruded into a linear shape with an extruder to form an air-permeable adhesive resin layer. The thickness and number of linear resins are 0.5 to 7 mm in diameter in order to optimize moisture permeability, The number is preferably 5 to 150/10 cm.

The moisture-permeable waterproof sheet for building materials of the present invention can be manufactured, for example, as follows. As shown in FIG. 2, the nonwoven fabric (11) having the anti-slip layer is formed so that the anti-slip layer is the outermost layer, the porous polyolefin film (4) is in the center, and the non-woven fabric (12) having the swelling layer is further added to the swelling layer. It is supplied to the T-die extruder (9) at a constant speed so as to come to the bonding surface, and three layers are superposed on the nip roll (10). Immediately before the superposition, (9) a thermoplastic resin linearly melt-extruded by a T-die extruder is applied. The extruded linear thermoplastic resin forms a breathable adhesive resin layer (5), and the porous polyolefin film (4) and the nonwoven fabric (12) having a swelling layer are pressed by the nip roll (10). By doing so, the adhesive is integrated. At this time, the non-woven fabric (11) having the anti-slip layer is also partially melted by the heat of the extruded linear thermoplastic resin to partially melt the porous polyolefin film (4) to form an adhesive resin layer, which is added by the nip roll (10). By being pressed, they are bonded and integrated at the same time. Therefore, the manufacturing method which can be bonded and integrated in a single step in a state where the three layers of the nonwoven fabric (11) having the anti-slip layer, the porous polyolefin film (4), and the nonwoven fabric (12) having the swelling layer remain moisture permeable. It becomes.

Examples of the present invention will be described below, but the present invention is not limited to the following examples.

Various characteristics of the moisture permeable waterproof sheet for building materials of the present invention are measured by the following methods. [Waterproofness] It was determined according to JIS L 1092 5.1.1 B method (waterproofness test method for textiles).

[Moisture permeability] The moisture permeability was determined by 4.1 A method of JIS L 1099 (method of moisture permeability test for textiles).

[Anti-slip property] Measured according to JIS A 1454 6.12 (slip property test). As the sliding piece, a polyester spunbonded nonwoven fabric (weight per unit area: 55 g / m ² ) was used.

[Nail hole sealing property] A sample is placed on a 12 mm thick plywood with the surface of the swelling layer on the back side, and a nail for a colonial tile (length 30 mm, maximum diameter 3.3 mm, minimum diameter 2.9 mm, maximum diameter (minimum diameter)) And an interval of 1.3 mm between the maximum diameter (minimum diameter). A PVC pipe with the bottom sealed with a sealing agent is placed on top of this, and the top is sealed with a rubber stopper with a 10 ml measuring pipet in the center. A water head pressure of 150 mm is applied to this, and the amount of water reduction (ml) after 24 hours is measured at n = 10.

(Example 1) The nonwoven fabric on the outer layer side is a polyester nonwoven fabric having a basis weight of 30 g / m ^2, an acrylic resin as an anti-slip agent, and a non-woven fabric having an anti-slip layer provided with a solid content of 40 g / m ² by a whole coating method. Created. The porous polyolefin film was a polyethylene film that can impart moisture permeable waterproof (breathable 7,000g ^/ m 2 ^/ 24hr). The nonwoven fabric on the inner layer side is a polyester nonwoven fabric with a weight per unit area of 30 g / m ² , starch-polyacrylate is used as a superabsorbent polymer, mixed with an acrylic binder resin, and 20 g / m ² is gravure. The nonwoven fabric which apply | coated with the roll and has a swelling layer was formed. The three-layer lamination is carried at a constant speed with the swelling layer surface of the nonwoven fabric having a swelling layer facing upward, and the nonwoven fabric having a non-slip layer supplied from the opposite direction on the nip roll is laminated with the porous polyolefin film. 150 g / m ^{2 of a} linear melt flow rate 40 thermoplastic resin melt-extruded from a T-die extruder equipped with a resin discharge nozzle is applied to the mouth, and then immediately cooled with a nip roll, A moisture-permeable waterproof sheet for building materials was obtained. As shown in Table 1, the moisture permeable waterproof sheet for building materials obtained in the present invention was evaluated as a roof base material, and good results were obtained.

(Example 2) using a polyethylene film of moisture permeability 15,000 g ^/ m 2/24 hr or as porous polyolefin film, was prepared otherwise in the same manner as in Example 1.

(Example 3) 50 g / m ^{2 of a} linear thermoplastic resin melt-extruded from a T-die type extruder was applied, and the others were produced in the same manner as in Example 1.

(Example 4) A linear thermoplastic resin melt-extruded from a T-die type extruder was applied at 300 g / m ² , and the others were produced in the same manner as in Example 1.

Example 5 The swelling layer was applied in the same manner as in Example 1 except that the coating amount was 10 g / m ² .

Example 6 The swelling layer was applied in the same manner as in Example 1 except that the coating amount was 50 g / m ² .

(Comparative Example 1) using a polyethylene film of moisture permeability 800g ^/ m 2 ^/ 24hr as the porous polyolefin film, was prepared otherwise in the same manner as in Example 1.

(Comparative example 2) 30 g / m ^{2 of a} sheet-like sheet of thermoplastic resin melt-extruded from a T-die extruder was applied, and the others were prepared in the same manner as in Example 1.

(Comparative Example 3) 400 g / m ^{2 of a} sheet-sheet thermoplastic resin melt-extruded from a T-die extruder was applied, and the others were produced in the same manner as in Example 1.

(Comparative Example 4) 5 g / m ^{2 of the} superabsorbent polymer of the swelling layer was applied, and the rest was prepared in the same manner as in Example 1.

(Comparative Example 5) 150 g / m ^{2 of the} superabsorbent polymer of the swelling layer was applied, and the rest was prepared in the same manner as in Example 1.

(Table 1)

As is apparent from Table 1, the moisture permeable waterproof sheet for building materials of the present invention shown in Examples 1 to 6 exhibits excellent moisture permeability, waterproof properties, and nail hole sealing properties, and is suitable as a roof material for building materials. It turned out to be a wet waterproof sheet.

On the other hand, although Comparative Examples 1-5 can ensure waterproofness, Comparative Examples 1, 3 and 5 cannot ensure good moisture permeability, and Comparative Examples 2 and 4 can ensure good nail hole sealing performance. There wasn't.

It is a schematic sectional drawing of the moisture-permeable waterproof sheet for building materials concerning one Embodiment of this invention. It is a figure which shows roughly the manufacturing method of the moisture-permeable waterproof sheet for building materials of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Moisture permeable waterproof sheet for building materials 2 ... Non-woven fabric of outer layer side 3 ... Non-woven fabric of inner layer side 4 ... Porous polyolefin film 5 ... Adhesive resin layer 6 ... Porous polyolefin film formed into adhesive resin layer 7 ... Anti-slip layer 8 ... Swelling layer DESCRIPTION OF SYMBOLS 9 ... T-die type extruder 10 ... Nip roll 11 ... Non-woven fabric having anti-slip layer 12 ... Non-woven fabric having swelling layer

Claims (7)

In the moisture permeable waterproof sheet for building materials in which a nonwoven fabric for protecting the porous polyolefin film is laminated on both sides of the porous polyolefin film having waterproofness and moisture permeability, the nonwoven fabric on the outer layer side is laminated after lamination. An anti-slip layer is provided on the upper surface that is the outermost layer, and the nonwoven fabric on the inner layer side is provided with a swelling layer formed of a superabsorbent polymer on the upper surface that is an adhesive surface with the porous polyolefin film, and the porous polyolefin film and the above-mentioned A moisture-permeable waterproof sheet for building materials, wherein three layers of an outer layer-side nonwoven fabric and the inner layer-side nonwoven fabric are laminated via an adhesive resin layer composed of a single layer of thermoplastic resin. In the moisture permeable waterproof sheet for building materials in which nonwoven fabrics are laminated on both surfaces of the porous polyolefin film, the moisture permeability after lamination and integration is 800 g / m ² · 24 hr or more and the waterproof property is 2,000 mm or more. The moisture-permeable waterproof sheet for building materials according to claim 1. The porous polyolefin film is made of a microporous film of at least one thermoplastic elastomer selected from polyethylene and polypropylene having a moisture permeability of 1000 g / m ² · 24 hr or more. The moisture-permeable waterproof sheet for building materials described. The non-woven fabric laminated on the outer layer surface of the porous polyolefin film is made of a non-woven fabric composed of at least one synthetic resin selected from polyester and polypropylene, and has an anti-slip layer on the upper surface. The moisture-permeable waterproof sheet for building materials as described in any one of. The nonwoven fabric laminated on the inner layer surface of the porous polyolefin film is a nonwoven fabric composed of at least one synthetic resin selected from polyester and polypropylene, and 10 to 50 g of a swelling layer in which a superabsorbent polymer and a binder are mixed on the upper surface. The moisture-permeable waterproof sheet for building materials according to any one of claims 1 to 4, wherein / m ^{2 is} applied. The adhesive resin layer is made of at least one thermoplastic olefin resin selected from polyethylene and polypropylene, and has an application amount of 50 to 300 g / m ² and is made of an adhesive resin layer melt-extruded linearly by an extruder. The moisture-permeable waterproof sheet for building materials according to any one of claims 1 to 5, wherein: Immediately before the nonwoven fabric having the swollen layer continuously fed and the nonwoven fabric having the porous polyolefin film and the anti-slip layer are superimposed, a thermoplastic resin is simply applied to the overlapping surface by a T-die extruder. The nonwoven fabric having the swollen layer and the porous polyolefin film are bonded with the thermoplastic resin, and the nonwoven fabric having the anti-slip layer is heat generated during processing of the thermoplastic resin. Then, while the porous polyolefin film is partially melted on the surface to form an adhesive resin layer, the porous polyolefin film is laminated on the porous polyolefin film, cooled under pressure, and the moisture-permeable property of the porous polyolefin film remains. A method for manufacturing a moisture permeable waterproof sheet for building materials, in which bonding is integrated in a single process.