JP2019035218A - Heat shield moisture permeable waterproof sheet and manufacturing method thereof - Google Patents

Abstract

A heat-insulating and moisture-permeable waterproof sheet having high heat resistance, moisture permeability and waterproof properties and high weather resistance and a method for producing the same are provided. A moisture permeable waterproof laminate having a nonwoven fabric layer and a porous polyolefin film layer, and a heat shield layer formed on one surface of the moisture permeable waterproof laminate, the heat shield layer comprising: , Containing aluminum powder and polyamide resin, formed with an area ratio of 70 to 95% coverage on one surface of the moisture-permeable and waterproof laminate, and an average value of infrared reflectance at a wavelength of 2 to 14 μm Is 40% or more, and the moisture permeability resistance value measured according to JIS A6111 is 0.19 m 2 · s · Pa / μg or less. [Selection] Figure 1

Description

  The present invention relates to a heat-insulating and moisture-permeable waterproof sheet having heat-insulating properties, moisture permeability, and waterproof properties and a method for producing the same.

In buildings such as houses, heat insulation with heat insulation, moisture permeability and waterproofing is required to allow indoor moisture to permeate outdoors while suppressing the penetration of heat rays from the outside and the penetration of rainwater into the indoors. A moisture permeable waterproof sheet may be installed on the roof base and the outer wall base.
As a heat-insulating and moisture-permeable waterproof sheet, for example, a sheet in which a heat-insulating layer containing metal particles is partially provided on one surface of a moisture-permeable and waterproof sheet is known (Patent Document 1).

JP 2011-84970 A

However, the heat-insulating and moisture-permeable waterproof sheet described in Patent Document 1 has low weather resistance, and the heat-insulating layer tends to deteriorate over time.
Then, an object of this invention is to provide the heat insulation moisture permeability waterproof sheet which has heat insulation, moisture permeability, and waterproofness, and also has high weather resistance, and its manufacturing method.

The heat-insulating and moisture-permeable waterproof sheet of the present invention has the following configuration.
A moisture permeable waterproof laminate having a nonwoven fabric layer and a porous polyolefin film layer, and a heat shield layer formed on one surface of the moisture permeable waterproof laminate, wherein the heat shield layer comprises aluminum powder and It contains a polyamide resin and is formed with an area ratio of 70 to 95% coverage on one surface of the moisture-permeable and waterproof laminate, and the average value of infrared reflectance at a wavelength of 2 to 14 μm is 40% or more. The moisture permeability resistance value measured according to JIS A6111 is 0.19 m ² · s · Pa / μg or less.

  According to the heat-insulating and moisture-permeable waterproof sheet of the present invention, instead of an aluminum layer (aluminum thin film) as a conventional heat shield, aluminum powder (heat insulating agent) is replaced with a polyamide resin (binder resin). It exhibits heat shielding properties by the dispersed heat shielding layer. Thereby, for example, the reflectance of infrared rays measured using a reflectance measuring device such as a spectrophotometer can be increased. By obtaining heat shielding properties with a heat shielding layer in which aluminum powder (heat shielding agent) is dispersed in a polyamide resin (binder resin), it is possible to keep the manufacturing cost low.

  According to the heat-insulating and moisture-permeable waterproof sheet of the present invention, the polyamide resin is used as the binder resin, and the aluminum powder is uniformly dispersed in the polyamide resin. It is fixed to. As a result, it is possible to reliably prevent a decrease in heat shielding performance due to aluminum powder falling off due to a change with time.

  In the present invention, the aluminum powder is preferably composed of aluminum particles having an average particle diameter of 1 μm or more and 40 μm or less.

  Moreover, in this invention, it is preferable that content with respect to 100 mass parts of said polyamide resin of the said aluminum powder of the said heat insulation layer is the range of 60 mass parts or more and 140 mass parts or less.

  Moreover, in this invention, it is preferable that the said aluminum powder is uniformly disperse | distributed with respect to the said polyamide resin along the thickness direction of the said heat insulation layer.

  Moreover, in this invention, it is preferable that the said heat insulation layer consists of what dispersed each aluminum particle of the said aluminum powder by resin beforehand to the said polyamide resin.

The manufacturing method of the heat-insulation moisture-permeable waterproof sheet of this invention has the following structures.
A method for producing a heat-permeable and moisture-permeable waterproof sheet according to each of the above items, wherein a moisture-permeable and waterproof laminate is produced by laminating a nonwoven fabric layer and a porous polyolefin film layer to produce the moisture-permeable and waterproof laminate. On one surface of the moisture permeable waterproof laminate, an ink for forming a heat shielding layer containing aluminum powder and polyamide resin is applied to one surface of the moisture permeable waterproof laminate with a coverage of 70 to 95%. And a thermal barrier layer forming step of forming the thermal barrier layer by printing at an area ratio.

The heat-insulating and moisture-permeable waterproof sheet of the present invention has heat-insulating properties, moisture-permeable properties and waterproof properties, and has high weather resistance.
According to the method for producing a heat-insulating and moisture-permeable waterproof sheet of the present invention, it is possible to easily produce a heat-insulating and moisture-permeable waterproof sheet having heat shielding properties, moisture permeability, and waterproof properties and high weather resistance.

It is sectional drawing which shows the heat insulation moisture-permeable waterproof sheet of one Embodiment of this invention.

  Hereinafter, with reference to drawings, the thermal-insulation moisture-permeable waterproof sheet of one embodiment of the present invention and its manufacturing method are explained. Each embodiment described below is specifically described for better understanding of the gist of the invention, and does not limit the present invention unless otherwise specified. In addition, in the drawings used in the following description, in order to make the features of the present invention easier to understand, there is a case where a main part is shown in an enlarged manner for convenience, and the dimensional ratio of each component is the same as the actual one. Not necessarily.

An embodiment of the heat-insulating and moisture-permeable waterproof sheet of the present invention will be described.
As shown in FIG. 1, the heat-permeable and moisture-permeable waterproof sheet 1 of this embodiment includes a moisture-permeable and waterproof laminate 10 having a nonwoven fabric layer 11 and a porous polyolefin film layer 12, and a heat-shielding layer 20. .
In the present embodiment, the heat shielding layer 20 is formed on the exposed surface of the porous polyolefin film layer 12.
When the heat-insulating and moisture-permeable waterproof sheet 1 of this embodiment is attached to a roof or an outer wall, the nonwoven fabric layer 11 is disposed on the indoor side, and the heat-insulating layer 20 is disposed on the outdoor side.

The nonwoven fabric layer 11 constituting the moisture-permeable and waterproof laminate 10 functions as a reinforcing material that reinforces the rigidity and breaking strength of the heat-insulating and moisture-permeable waterproof sheet 1.
There is no restriction | limiting in particular as a kind of nonwoven fabric which comprises the nonwoven fabric layer 11, For example, a spun bond nonwoven fabric, a melt blown nonwoven fabric, a needle punch nonwoven fabric, etc. are mentioned. Among these, a spunbond nonwoven fabric or a melt blown nonwoven fabric is preferable because the waterproofness is further improved.

Although there is no restriction | limiting in particular as the material of the fiber which comprises the nonwoven fabric layer 11, From a point of a price and intensity | strength, a polyethylene terephthalate, polyethylene, a polypropylene, and polyamide are preferable, for example.
Basis weight of the nonwoven fabric layer 11 may, for example, is preferably from 10 to 80 g / ^{m 2,} and more preferably 20 to 50 g / ^{m 2.} If the fabric weight of the nonwoven fabric layer 11 is more than the said lower limit, sufficient reinforcement effect will be acquired, and if it is below the said upper limit, it can be reduced in weight.

The porous polyolefin film layer 12 constituting the moisture-permeable and waterproof laminate 10 is a layer that plays a major role in developing waterproofness and moisture permeability in the heat-insulating and moisture-permeable waterproof sheet 1.
Although it does not specifically limit as the porous polyolefin film layer 12, For example, it is preferable to comprise from a porous polyethylene film or a porous polypropylene film. Furthermore, it is more preferable that the porous polyolefin film layer 12 is composed of a porous polyethylene film in terms of further improving moisture permeability.

  The porosity of the porous polyolefin film layer 12 is imparted, for example, by containing inorganic particles (such as calcium carbonate). That is, for example, when a porous polyolefin film is produced, a film containing inorganic particles (calcium carbonate or the like) that tends to be a break point due to lack of stretchability is stretched, and minute cracks are formed at the positions where the inorganic particles are present. By making it grow, micropores can be formed. By forming such micropores, moisture permeability can be imparted while having waterproofness. It is preferable that the volume average particle of the inorganic particles measured by a laser diffraction / scattering method is 5 μm or less.

  Further, as a method of imparting porosity to the porous polyolefin film layer 12, by making a number of cuts along the stretching direction in the uniaxially stretched polyolefin film, by stretching in a direction perpendicular to the stretching direction, A method of opening the polyolefin film by tearing it to such an extent that it does not break is mentioned.

Basis weight of the porous polyolefin film layer 12 is preferably from 1 to 50 g / ^{m 2,} and more preferably 10 to 30 g / ^{m 2.} If the basis weight of the porous polyolefin film layer 12 is not less than the above lower limit value, a sufficiently high waterproof property can be secured, and if it is not more than the above upper limit value, a sufficiently high moisture permeability can be secured.

The moisture permeability of the porous polyolefin film layer 12 is preferably 3000 g / (m ² · 24 hr) or more. Here, the moisture permeability is a value measured in accordance with JIS L1099, 4.1, Method A (moisture permeability test method for textiles). If the water vapor transmission rate of the porous polyolefin film layer 12 is more than the said lower limit, the water vapor transmission property of the heat-insulation moisture-permeable waterproof sheet 1 can be improved more. However, if the moisture permeability is too high, the waterproof property may be lowered. Therefore, the moisture permeability of the porous polyolefin film layer 12 is preferably 12000 g / (m ² · 24 hr) or less.

The heat shield layer 20 is a layer that reflects infrared rays and shields heat, and contains a heat shield and a binder resin.
Aluminum powder is used as the heat shield. Such aluminum powder has an infrared (wavelength: 2 to 14 μm) reflectance of 20% or more. The content of the aluminum powder is appropriately adjusted so as to obtain the desired heat shielding property (heat shielding property that the average value of infrared reflectance at a wavelength of 2 to 14 μm is 40% or more, preferably 42% or more).

  The aluminum powder is uniformly dispersed with respect to the binder resin in the thickness direction of the heat shield layer 20. The aluminum particles constituting the aluminum powder are preferably granular (non-leafing type) particles having a spherical shape or a polygonal shape. Use of aluminum powder made of scale-like aluminum particles (leafing type) is not preferable because the aluminum particles are unevenly dispersed in the thickness direction of the heat shield layer 20 and are likely to be unevenly distributed on the surface of the heat shield layer 20.

The aluminum particles constituting the aluminum powder preferably have a volume average particle diameter measured by a laser diffraction / scattering method in the range of 1 μm to 40 μm, more preferably in the range of 2 μm to 20 μm, for example, 10 μm. preferable.
Moreover, as aluminum powder mixed with binder resin, in order to improve heat-shielding property, it is preferable to use a thing with a purity of 90 mass% or more, it is more preferable that a purity is 95 mass% or more, and a purity is 99 mass. % Or more is more preferable.

  Moreover, it is also preferable to use what coated the aluminum particle with resin as aluminum powder. Examples of the resin that coats the aluminum particles include an acrylic resin. Thus, by using aluminum powder (resin-coated aluminum powder) in which aluminum particles are coated with a resin, when dispersed in the binder resin, the affinity between the binder resin and the aluminum particles is increased, and the aluminum particles are more uniformly distributed. Can be dispersed in a binder resin.

A polyamide resin is used as the binder resin. As the polyamide resin, those obtained by ring-opening polymerization of cyclic lactam (—CO—NH—) or polycondensation of ω-aminocarboxylic acid include nylon 6 (registered trademark), nylon 11 (registered trademark), nylon 12 (Registered trademark). In addition, as obtained by polycondensation of diamine (H ₂ N—R—NH ₂ ) and dibasic acid (HOOC—R′COOH), nylon 66 (registered trademark), nylon 610 (registered trademark), nylon 612 ( Registered trademark).

As the binder resin, it is preferable to use a polyamide resin having low transparency in terms of further improving the heat shielding property.
The aluminum powder, which is a heat shield contained in the heat shield layer 20, can keep the heat shield property easily and keep the material cost of the heat shield layer 20 low.

  The content of the aluminum powder with respect to 100 parts by mass of the polyamide resin is preferably in the range of 60 parts by mass to 140 parts by mass (when the purity of the aluminum powder is 100%). By making content with respect to the polyamide resin of aluminum powder into the range mentioned above, the adhesive force with respect to the moisture-permeable waterproof laminated body 10 of the heat-shielding layer 20 can be kept high, and omission of the aluminum powder by a time-dependent change can be prevented.

  The heat shielding layer 20 is formed with an area ratio of 70 to 95% when the area of one surface of the moisture permeable waterproof laminate 10 is 100% (that is, the moisture permeable waterproof laminate 10). The thermal barrier layer 20 is not formed on 5% to 30% of the one surface. When the coverage of the heat-insulating layer 20 is less than the lower limit value, heat shielding properties may not be ensured, and when the upper limit value is exceeded, moisture permeability may not be ensured. The coverage is preferably 80 to 90%.

It is preferable that the heat shielding layer 20 is formed uniformly on the surface of the moisture permeable waterproof laminate 10. For example, when the surface of the moisture-permeable and waterproof laminate 10 is divided into 5 cm square regions, the heat shielding layer 20 is preferably formed in an area ratio of 70 to 95% in each region. It is preferable to be formed with an area ratio of 80 to 90%.
Moreover, in the surface of the moisture-permeable waterproof laminated body 10, the heat insulation layer 20 is formed in thickness about 0.5-1.5 micrometers, for example.

The said heat-permeable moisture-permeable waterproof sheet 1 is manufactured by the manufacturing method which has a moisture-permeable waterproof laminated body preparation process and a heat-shielding layer formation process.
The moisture permeable waterproof laminate manufacturing step is a step of manufacturing the moisture permeable waterproof laminate 10 by laminating the nonwoven fabric layer 11 and the porous polyolefin film layer 12.
An adhesive may be used in the lamination with the nonwoven fabric layer 11 and the porous polyolefin film layer 12.
Examples of the adhesive used include olefin resin such as polyethylene resin, ethylene-vinyl acetate copolymer resin, polyurethane resin, polyamide resin hot melt adhesive, acrylic resin, vinyl acetate resin, or polyvinyl alcohol. And emulsion type adhesives.
The adhesive may be applied using a spray or a coater.

  In the heat shielding layer forming step, a heat shielding layer forming ink containing a heat shielding agent (aluminum powder) and a binder resin (polyamide resin) is printed on one surface of the moisture permeable waterproof laminate. 20 is a step of forming 20. In the present embodiment, the heat shield layer 20 is formed on the exposed surface of the porous polyolefin film layer 12.

  As a method for printing the heat shielding layer forming ink, gravure printing, offset printing, flexographic printing, screen printing, etc. can be applied, and gravure printing or offset printing is used in that the heat shielding layer 20 can be easily formed. preferable.

  In the case of applying gravure printing or offset printing, as a method for adjusting the coverage of the thermal barrier layer 20, for example, a method of adjusting the concave area ratio of the gravure printing plate, or adjusting the dot area ratio of the offset printing plate Methods and the like.

The coating amount of the heat shielding layer forming ink may be, for example, about 1.0 to 2.0 g / m ² . Thereby, in the surface of the moisture-permeable waterproof laminated body 10, the heat insulation layer 20 is formed in thickness about 0.5-1.5 micrometers, for example.

  According to the heat-insulating and moisture-permeable waterproof sheet 1 of the present invention described above, instead of an aluminum layer (aluminum thin film) as a conventional heat shield, an aluminum powder (heat insulating agent) is replaced with a polyamide resin ( The heat shielding property is exhibited by the heat shielding layer 20 dispersed in the binder resin. Thereby, for example, the reflectance of infrared rays having a wavelength of 2 to 14 μm measured using a reflectance measuring device such as a spectrophotometer can be made 40% or more. Note that if the reflectance is too high, other performance may be deteriorated, so the upper limit of the average value of the reflectance is preferably 60%.

  In addition, instead of an aluminum layer as a conventional heat shield, instead of a heat shield layer 20 in which aluminum powder (heat shield) is dispersed in a polyamide resin (binder resin), heat insulation is obtained. Manufacturing costs can be kept low.

  And according to the heat-insulating and moisture-permeable waterproof sheet 1 of the present invention, polyamide resin is used as the binder resin, and aluminum powder composed of aluminum particles having a volume average particle diameter in the range of 1 μm to 40 μm is applied to the polyamide resin. By uniformly dispersing in the thickness direction of the layer 20, the aluminum particles are securely fixed by the polyamide resin. As a result, it is possible to reliably prevent a decrease in heat shielding performance due to aluminum powder falling off due to a change with time.

Furthermore, since the heat-insulating and moisture-permeable waterproof sheet 1 according to the present invention includes the porous polyolefin film layer 12, both waterproofness and moisture permeability can be improved. Specifically, the moisture permeability and waterproofness of the moisture permeable waterproof sheet shown in JIS A6111: 2004 can be easily satisfied. For example, the moisture permeability resistance value of the entire heat-insulating and moisture-permeable waterproof sheet 1 in JIS A6111 is easily 0.19 m ² · s · Pa / μg or less. In order to achieve this moisture resistance, the moisture permeability resistance of the portion where the heat shielding layer 20 is provided is preferably 0.26 to 0.30 m ² · s · Pa / μg, It is preferable that the moisture permeability resistance of the portion not provided is 0.05 to 0.12 m ² · s · Pa / μg.

In addition, the heat insulation moisture-permeable waterproof sheet of this invention is not limited to the thing of the said embodiment.
For example, in the above embodiment, the heat shielding layer is formed on the exposed surface of the porous polyolefin film layer, but the heat shielding layer may be formed on the exposed surface of the nonwoven fabric layer.

  As mentioned above, although embodiment of this invention was described, these embodiment is shown as an example and is not intending limiting the range of invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

Hereinafter, the effect was verified about the heat insulation moisture-permeable waterproof sheet of the example of the present invention and the conventional comparative example. The sample used for verification and the verification method are shown below.
(Invention Example 1)
The nonwoven fabric layer and the porous polyethylene film layer were bonded using an adhesive to obtain a moisture-permeable and waterproof laminate. Here, as the nonwoven fabric layer, a polyethylene terephthalate (PET) fiber nonwoven fabric having a basis weight of 45 g / m ² was used. The porous polyolefin film layer has a basis weight of 27 g / m ² and a value measured according to JIS L1099 4.1 method A (moisture permeability test method for textiles) of 10,000 g / (m ² · 24 hr. ) Was used.
On the exposed surface of the porous polyolefin film layer constituting the moisture-permeable and waterproof laminate described above, an ink for forming a heat shield layer containing aluminum powder and polyamide resin (non-leafing type aluminum powder (volume average particle diameter 5 μm, purity 99 mass) %) And a polyamide resin) were subjected to gravure printing so that the coverage was 80% to form a heat shielding layer. The content of the aluminum powder with respect to 100 parts by mass of the polyamide resin in the heat shielding layer was 50 parts by weight. This obtained the heat-insulation moisture-permeable waterproof sheet of the example 1 of the present invention. In such a heat-insulating and moisture-permeable waterproof sheet, the aluminum powder is uniformly dispersed in the polyamide resin along the thickness direction of the heat-insulating layer.

(Invention Example 2)
On the exposed surface of the porous polyolefin film layer constituting the moisture-permeable and waterproof laminate having the same configuration as that of the above-described Example 1 of the present invention, an ink for forming a heat shielding layer containing non-leafing type aluminum powder (non-leafing type aluminum powder ( A volume average particle diameter of 5 μm, a purity of 99% by mass or more) and a polyamide resin were gravure-printed so that the coverage was 95% to form a heat-shielding layer. The content of the aluminum powder with respect to 100 parts by mass of the polyamide resin in the heat shielding layer was 80 parts by weight. Thereby, the heat-insulation moisture-permeable waterproof sheet of Example 2 of the present invention was obtained.

(Invention Example 3)
On the exposed surface of the porous polyolefin film layer constituting the moisture-permeable and waterproof laminate having the same configuration as that of the above-described Example 1 of the present invention, an ink for forming a heat shielding layer containing non-leafing type aluminum powder (non-leafing type aluminum powder ( A volume average particle diameter of 5 μm, a purity of 99% by mass or more) and a polyamide resin were gravure-printed so that the coverage was 70% to form a heat shielding layer. The content of the aluminum powder with respect to 100 parts by mass of the polyamide resin in the heat shielding layer was 80 parts by weight. Thereby, the heat-insulation moisture-permeable waterproof sheet of Example 3 of the present invention was obtained.

(Invention Example 4)
On the exposed surface of the porous polyolefin film layer constituting the moisture-permeable and waterproof laminate having the same configuration as that of the above-described Example 1 of the present invention, an ink for forming a heat shielding layer containing non-leafing type aluminum powder (non-leafing type aluminum powder ( A volume average particle diameter of 5 μm and a purity of 99% by mass or more) and a polyamide resin.) Were subjected to gravure printing to form a heat shielding layer. The content of the aluminum powder with respect to 100 parts by mass of the polyamide resin in the heat shielding layer was 60 parts by weight. This obtained the heat-insulation moisture-permeable waterproof sheet of the example 4 of the present invention.

(Invention Example 5)
On the exposed surface of the porous polyolefin film layer constituting the moisture-permeable and waterproof laminate having the same configuration as that of the above-described Example 1 of the present invention, an ink for forming a heat shielding layer containing non-leafing type aluminum powder (non-leafing type aluminum powder ( A volume average particle diameter of 5 μm and a purity of 99% by mass or more) and a polyamide resin.) Were subjected to gravure printing to form a heat shielding layer. The content of the aluminum powder with respect to 100 parts by mass of the polyamide resin in the heat shielding layer was 140 parts by weight. This obtained the heat-insulation moisture-permeable waterproof sheet of Example 5 of this invention.

(Comparative Example 1)
The nonwoven fabric layer and the porous polyethylene film layer were bonded using an adhesive to obtain a moisture-permeable and waterproof laminate. Here, as the nonwoven fabric layer, a polyethylene terephthalate (PET) fiber nonwoven fabric having a basis weight of 45 g / m ² was used. The porous polyolefin film layer has a basis weight of 27 g / m ² and a value measured according to JIS L1099 4.1 method A (moisture permeability test method for textiles) of 10,000 g / (m ² · 24 hr. ) Was used.
On the exposed surface of the porous polyolefin film layer constituting the moisture-permeable and waterproof laminate described above, an ink for forming a heat shielding layer containing aluminum powder and acrylic resin (leafing type aluminum powder (purity 99% by mass or more) and alkyl acrylate) And an ester copolymer) were subjected to gravure printing so that the coverage was 80% to form a heat shielding layer. The content of the aluminum powder with respect to 100 parts by mass of the acrylic resin of the heat shielding layer was 140 parts by weight. Thereby, the heat-insulation moisture-permeable waterproof sheet of the comparative example 1 was obtained.

(Comparative Example 2)
On the exposed surface of the porous polyolefin film layer constituting the moisture-permeable waterproof laminate having the same structure as that of Comparative Example 1 described above, a heat shielding layer forming ink containing aluminum powder and polyamide resin (non-leafing type aluminum powder (volume) (Including an average particle diameter of 5 μm, a purity of 99% by mass or more) and a polyamide resin.) Was gravure-printed so as to have a coverage of 98%, thereby forming a heat shielding layer. The content of the aluminum powder with respect to 100 parts by mass of the polyamide resin in the heat shielding layer was 80 parts by weight. Thereby, the heat-insulation moisture-permeable waterproof sheet of the comparative example 2 was obtained.

<Evaluation>
[Heat insulation]
About the heat-insulation moisture-permeable waterproof sheet of each example, the reflectance of the light ray with a wavelength of 2-20 micrometers is measured using a reflectance measuring apparatus (Shimadzu Corporation UV-3101PC type self-recording spectrophotometer), The average value Asked. The results are shown in Table 1. The higher the average reflectance, the higher the heat shielding property.
[Moisture permeability resistance]
About the heat-insulation moisture-permeable waterproof sheet of each example, the moisture-permeable resistance value was measured based on the moisture-permeable test method prescribed | regulated to JISA6111: 2004. The results are shown in Table 1. The smaller the value of moisture permeability resistance, the higher the moisture permeability.
[Weatherability]
About the heat-insulation moisture-permeable waterproof sheet of each example, the test based on the salt spray test method of JISZ2371: 1994 was done, and peeling of a heat-shielding layer (appearance of a heat-shielding layer) was evaluated. The evaluation results are shown in Table 1.
○: Stripping rate is less than 10%.
Δ: Stripping rate of 10% or more and less than 40%.
X: Stripping rate of 40% or more.
[durability]
The gross value of the test piece (size 100 mm × 100 mm) before and after the above-described weather resistance test was measured and evaluated by the reduction rate. As a test method, ionic water was added and the above-mentioned test piece was immersed for 30 minutes in a constant temperature water bath maintained at a water temperature of 90 ° C. Measurement was performed using an IG-320 gloss checker.

The heat-insulating and moisture-permeable waterproof sheet of Invention Example 1-5 had an infrared reflectance of 2 to 14 μm and a heat shielding property of 40% or more.
Moreover, the moisture permeability resistance of the heat-insulating moisture-permeable waterproof sheet of Invention Example 1-5 was in the range of 0.19 m ² · s · Pa / μg or less, and had high moisture permeability.
Moreover, the heat-insulation moisture-permeable waterproof sheet of Invention Example 1-4 was excellent in weather resistance. On the other hand, Comparative Example 1 using a leafing type aluminum powder and Comparative Example 2 having a coverage of 98% had low weather resistance.
In addition, the heat-insulating and moisture-permeable waterproof sheet of Invention Example 1-5 has a gloss rate reduction rate of 2.2% (Invention Example 5) at the maximum, with 5% or less as a guideline. It was excellent. On the other hand, in Comparative Example 1 using the leafing type aluminum powder, the reduction rate of the gloss value reaches 7.5%, and there is a problem in durability.

  According to the verification results as described above, the heat-insulating and moisture-permeable waterproof sheet of the present invention exhibits excellent durability in which the reflectance is substantially maintained even over time, and the heat-insulating layer is less peeled off and is good It was confirmed that a good weather resistance was secured.

DESCRIPTION OF SYMBOLS 1 ... Heat-permeable moisture-permeable waterproof sheet 10 ... Moisture-permeable waterproof laminated body 11 ... Nonwoven fabric layer 12 ... Porous polyolefin film layer 20 ... Heat-shielding layer

Claims (6)

A moisture-permeable waterproof laminate having a nonwoven fabric layer and a porous polyolefin film layer, and a heat-insulating layer formed on one surface of the moisture-permeable waterproof laminate,
The heat-shielding layer contains aluminum powder and a polyamide resin, and is formed with an area ratio of 70 to 95% coverage with respect to one surface of the moisture-permeable and waterproof laminate.
A heat-insulating and moisture-permeable waterproof sheet characterized by having an average value of infrared reflectance at a wavelength of 2 to 14 μm of 40% or more and a moisture permeability resistance value measured according to JIS A6111 of 0.19 m ² · s · Pa / μg or less .   The heat-insulating and moisture-permeable waterproof sheet according to claim 1, wherein the aluminum powder is made of aluminum particles having an average particle diameter of 1 µm or more and 40 µm or less.   3. The heat-insulating and moisture-permeable waterproofing according to claim 1, wherein a content of the aluminum powder in the heat-insulating layer with respect to 100 parts by mass of the polyamide resin is in a range of 60 parts by mass or more and 140 parts by mass or less. Sheet.   4. The heat-insulating and moisture-permeable waterproof sheet according to claim 1, wherein the aluminum powder is uniformly dispersed with respect to the polyamide resin along a thickness direction of the heat-insulating layer. 5. .   The heat-insulating layer according to any one of claims 1 to 4, wherein the heat-insulating layer is formed by dispersing individual aluminum particles of the aluminum powder previously coated with a resin in the polyamide resin. Moisture permeable tarpaulin. The method for producing a heat-permeable and moisture-permeable waterproof sheet according to any one of claims 1 to 5, wherein the moisture-permeable and waterproof laminate is produced by laminating a nonwoven fabric layer and a porous polyolefin film layer. A laminate manufacturing process;
On one surface of the moisture permeable waterproof laminate, an ink for forming a heat shielding layer containing aluminum powder and polyamide resin is applied to one surface of the moisture permeable waterproof laminate with a coverage of 70 to 95%. And a thermal barrier layer forming step of forming the thermal barrier layer by printing at an area ratio.

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