JP2010235734A - Water-stopping polyurethane foam-sealing material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water-stopping polyurethane foam-sealing material having flexibility, considering usage in a bent state or followability to steps, and having high insulating properties. <P>SOLUTION: The water-stopping polyurethane foam-sealing material comprises a polyurethane foam layer having water-stopping properties and an urethane elastomer layer having the insulating properties, wherein the polyurethane foam layer and the urethane elastomer layer adheres to each other through chemical bonds. Further, the water-stopping polyurethane foam-sealing material may comprises an elastomer layer having a different function adhered through chemical bonds to the urethane elastomer layer. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a highly insulating foam sealing material used in electrical and electronic equipment. In particular, the present invention relates to a water-proof polyurethane foam sealing material having high insulation and flexibility used in electric / electronic devices.

  In equipment in the electric / electronic field, high insulation is required for the sealing material. In addition, the insulating property does not vary depending on the part of the sealing material, and must be highly reliable. On the other hand, a member to be sealed is often a box-shaped container made of a thermoplastic resin or a thin metal plate, and is easily deformed under a high load. Therefore, the sealing material is required to have flexibility.

  Furthermore, in an electric device such as an electric refrigerator where water is present and an electric / electronic device used around water, water-stopping is required. In addition, since electrical and electronic devices installed outdoors are exposed to wind and rain and outside air, high water-stopping properties are required. Typical examples of such electrical and electronic equipment installed outdoors include a switchboard box installed outdoors, and a photovoltaic power generation system (solar cell) that has recently been demanding worldwide.

  FIG. 9 shows a conventional solar cell module 900. The solar cell module 900 is configured by inserting and fixing a solar cell panel 910 into a metal frame 921 through a sealing material 931. In the solar battery panel 910, a layer 912 in which the solar battery cell 901 is protected by a sealing material (EVA resin; ethylene-vinyl acetate copolymer resin) 902 includes a transparent substrate 911 typified by glass and a protective film (back sheet). 913.

  In general, the solar battery cell 901 and the EVA resin are easily deteriorated by moisture. For this reason, the sealing material 931 in contact with the side surface not protected by the back sheet 913 is required to have a high water-stopping property. Further, in order to protect the solar battery cell 901 from an electric shock such as a lightning strike, the sealing material 931 is also required to have insulating properties.

  A butyl rubber sealing material is known as a sealing material for such a solar cell module. However, since the solar cell module is exposed to direct sunlight and becomes high temperature, the butyl rubber-based sealing material is softened at 60 to 70 ° C. and is deformed by the weight of the panel to lower the sealing performance.

  As a countermeasure against the fluidity of such a butyl rubber-based sealing material, for example, as in Patent Document 1, a method of suppressing a butyl rubber-based sealing material with an elastic member, or a sheet-like butyl rubber-based sealing material and a sheet-shaped elastic member A sealing method by overlapping is known. Patent Document 2 proposes a sealing material in which a flexible foam and a resin having high insulation performance are combined.

  However, these methods require a bonding process in order to make a flexible foam and an insulating resin into a composite. For this reason, adhesiveness may be inferior depending on the bonding method. Also, depending on the combination of the flexible foam and the insulating resin, the required adhesive strength does not come out, and it is necessary to select a special adhesive and a special adhesion method.

  When a solar cell panel is fitted into a metal frame using a composite of an adhesive foam and insulating resin, the insulating resin peels off when the adhesive foam and insulating resin composite is bent or folded. there is a possibility. In addition, when a composite product processed into a string shape is bent at the corner of the metal frame or bent along the curved portion of the metal frame, wrinkles are generated on the surface of the insulating resin, and the bonded foam and insulating resin It is easy to create a gap at the interface. Furthermore, when there is a level difference or unevenness on the surface of the foam in contact with the insulating resin, a gap is likely to be generated between the sealing material of the composite of the foam and the insulating resin and the solar cell panel.

Japanese Utility Model Publication No. 6-17324 Japanese Unexamined Patent Publication No. 7-32524

  The present invention provides a water-stopping polyurethane foam sealing material having flexibility in consideration of bending use and step following ability and having high insulation.

  According to one embodiment of the present invention, the polyurethane foam layer having water-stopping property and the urethane-based elastomer layer having insulating properties are provided, and the polyurethane foam layer and the urethane-based elastomer layer are chemically treated without using an adhesive. There is provided a water-stopping polyurethane foam sealing material characterized by being in close contact by bonding.

  In the water-repellent polyurethane foam sealant, elastomer layers having different functions may be adhered to the urethane elastomer layer by chemical bonding.

  The water-stopping polyurethane foam sealing material may be a sealing material for electric and electronic equipment.

  The water-stopping polyurethane foam sealing material may be a sealing material for electric and electronic devices having an adhesive tape on one side or both sides.

  The water-stopping polyurethane foam sealing material may be an electric refrigerator sealing material.

  The water-stopping polyurethane foam sealant may be a switchboard box sealant.

  The water-stopping polyurethane foam sealing material may be a solar cell module sealing material.

According to the present invention, there is provided a water-stopping polyurethane foam sealing material having flexibility in consideration of bending use and step following ability and having high insulation.

The water-stop polyurethane foam sealing material which concerns on one Embodiment of this invention. The water-stop polyurethane foam sealing material which concerns on one Embodiment of this invention. The water-stop polyurethane foam sealing material which concerns on one Embodiment of this invention. The water-stop polyurethane foam sealing material which concerns on one Embodiment of this invention. The solar cell module which concerns on one Embodiment of this invention. The switchboard box which concerns on one Embodiment of this invention. Schematic diagram of withstand voltage measurement. The schematic diagram of a U-shaped water stop test. Conventional solar cell module.

Hereinafter, a water-stopping polyurethane foam sealing material according to an embodiment of the present invention will be described with reference to the drawings. The following embodiments are examples of the water-stopping polyurethane foam sealing material of the present invention, and the water-stopping polyurethane foam sealing material of the present invention is not limited to the following embodiments.

  The above-described problems are caused by the fluidity of the butyl rubber sealing material and the adhesion between the sheet-like butyl rubber sealing material and the sheet-like elastic member. The means to solve these problems simultaneously was examined.

  As a result, an insulating resin that does not exhibit fluidity at the temperature of the usage environment is used, and such an insulating resin and a foam having flexibility are not bonded, but are chemically bonded to form an integrated product. It has been found that these problems can be solved simultaneously.

(Embodiment 1)
FIG. 1 is a configuration diagram of a water-stopping polyurethane foam sealing material 100 according to an embodiment of the present invention. The water-stopping polyurethane foam sealing material 100 has a polyurethane foam layer 101 and an insulating elastomer layer 111.

In order to form the water-stopping polyurethane foam sealing material 100, first, the polyurethane foam layer 101 is formed to a predetermined thickness. The polyurethane foam layer 101 includes at least a polyol, an isocyanate, and a foaming agent as materials. For example, water is used as the foaming agent. Moreover, you may form by adding a catalyst, a foam stabilizer, and another component suitably.

  Subsequently, a reactive composition of urethane-based elastomer having a liquid insulating property is applied to the upper surface of the polyurethane foam layer 101, and the reaction is solidified and bonded by a chemical reaction between the insulating elastomer layer 111 and the polyurethane foam layer 101. Form an integral product.

  Examples of the foam having the flexibility and water-stopping property shown in the polyurethane foam layer 101 include Super Seal WB and Super Sheet H manufactured by Nihon Hojo Co., Ltd.

As the polyurethane foam according to Embodiment 1 of the present invention, for example, the apparent density is 30 to 300 kg / m ³ , and the hardness is measured by JIS K 6400-2 (Method D) (second compression 50%, after 20 seconds) 4-20 kPa by measurement), restorability is measured by JIS K 6400-4 (Method B) (measured after 70% compression, 22 hours, 50% compression), 90% or more, and airtightness is JIS K 6400-7. The measurement by (Method B) (Fragile method, thickness 10 mm) is preferably 5 ml / cm ² / sec or less and the hydrophobicity has a contact angle of 90 ° or more. The polyurethane foam which concerns on one Embodiment of this invention is not limited above according to the function requested | required of a product, A characteristic can be selected arbitrarily.

  Moreover, as the insulating resin having flexibility according to the first embodiment of the present invention shown in the insulating elastomer layer 111, a urethane-based elastomer having an insulating property capable of being chemically bonded to the polyurethane foam is applicable.

  Examples of the urethane elastomer having insulation properties according to Embodiment 1 of the present invention include, for example, AC dielectric breakdown strength (JEM1021 “Insulation resistance and withstand voltage of control equipment” 6.3 Pressurization method and pressurization of withstand voltage test) Time) is preferably 20 kV / mm or more, Shore A hardness (23 ° C.) is around 80, and hydrophobicity is preferably 90 ° or more. The urethane-based elastomer having insulating properties according to Embodiment 1 of the present invention is not limited to the above depending on the function required for the product, and the characteristics can be arbitrarily selected.

  Further, like the water-stopping polyurethane foam seal material 200 according to one embodiment of the present invention shown in FIG. Also good.

  The water-stopping polyurethane foam sealing material according to Embodiment 1 of the present invention is a polyurethane foam layer and an insulating urethane-based elastomer layer bonded together by a chemical reaction, and the polyurethane foam layer and the insulating urethane-based elastomer layer have an insulating property. No need for an adhesion processing step, and there is an excellent effect that strong adhesion can be achieved without performing a special primer treatment or the like. Therefore, a product is provided in which the possibility of poor adhesion by the bonding method is eliminated.

(Embodiment 2)
In Embodiment 1, a urethane-based elastomer reactive composition having a liquid insulating property is applied to the polyurethane foam layer, and the urethane-based elastomer layer having an insulating property is formed by chemical bonding. Form 2 is characterized in that a urethane-based elastomer layer having insulating properties is formed first.

  The water-stopping polyurethane foam sealing material according to the second embodiment of the present invention has the same properties as the polyurethane foam layer and the urethane-based elastomer layer having insulating properties according to the required product functions, as in the first embodiment. You can choose.

  First, a sheet-like solid urethane-based elastomer layer having insulating properties is formed, and an unreacted urethane material (mixture of isocyanate, polyol, foaming agent and other components) is applied, reacted and solidified, and insulated. An integrated product is formed by a chemical reaction between a urethane-based elastomer layer having polyurethane and a polyurethane foam layer.

  In addition, two sheet-like solid urethane elastomer layers with insulating properties are formed, and an unreacted urethane material (mixture of isocyanate, polyol, foaming agent, and other components) is applied between them to react. A solid product such as the water-resistant polyurethane foam sealing material 200 according to the embodiment of the present invention shown in FIG. 2 may be formed by a chemical reaction between the urethane-based elastomer layer and the polyurethane foam layer that are solidified and insulated.

  The water-stopping polyurethane foam sealing material according to Embodiment 2 of the present invention is a polyurethane foam layer and an insulating urethane-based elastomer layer bonded together by a chemical reaction, and the polyurethane foam layer and the insulating urethane-based elastomer layer have an insulating property. No need for an adhesion processing step, and there is an excellent effect that strong adhesion can be achieved without performing a special primer treatment or the like. Therefore, a product is provided in which the possibility of poor adhesion by the bonding method is eliminated.

(Embodiment 3)
In Embodiments 1 and 2, one polyurethane-based elastomer layer having insulating properties is formed on one or both surfaces of the polyurethane foam layer by chemical bonding, respectively. However, the water-stopping polyurethane foam sealing material according to Embodiment 3 of the present invention is Two layers of the elastomer layer are formed on one side or both sides.

  In the water-stopping polyurethane foam seal material according to the third embodiment, as in the first embodiment, the characteristics of the polyurethane foam layer and the urethane-based elastomer layer having insulating properties are arbitrarily selected according to the required function of the product. Can do.

  FIG. 3 is a configuration diagram of a water-stopping polyurethane foam sealing material 300 according to Embodiment 3 of the present invention. As described in Embodiment 1, the water-stopping polyurethane foam sealing material 300 forms the polyurethane-based elastomer layer 311 having the first insulating property after the polyurethane foam layer 301 is formed. In the present embodiment, the reaction of a liquid elastomer having a function (for example, adhesiveness) different from that of the first insulating urethane-based elastomer layer 311 on the upper surface of the first insulating urethane-based elastomer layer 311. An adhesive composition is applied and reacted and solidified to form a second elastomer layer 321. In this manner, an integral product in which two elastomer layers having different functions are bonded to the upper surface of the polyurethane foam layer by a chemical reaction can be obtained.

  Further, like the water-stopping polyurethane foam sealant 400 according to the embodiment of the present invention shown in FIG. 4, a urethane-based elastomer layer 411 having a first insulating property is provided on both upper and lower surfaces of the polyurethane foam layer 401. Further, a second elastomer layer 421 having a function different from that of the urethane-based elastomer layer 411 having the first insulating property may be formed.

  The water-stopping polyurethane foam sealing material according to an embodiment of the present invention includes a polyurethane foam layer and a urethane-based elastomer layer having a first insulating property bonded by a chemical reaction, and further a urethane-based elastomer having a first insulating property. A layer and a second elastomer layer having different functions are bonded by a chemical reaction, and an adhesive processing step between the polyurethane foam layer and the first urethane-based elastomer layer having an insulating property, and an elastomer layer having different functions There is an excellent effect that strong bonding can be performed without performing any special primer treatment or the like without requiring any bonding process. Therefore, a product is provided in which the possibility of poor adhesion by the bonding method is eliminated.

  Furthermore, the water-stopping polyurethane foam sealing material according to an embodiment of the present invention includes a first insulating elastomer layer and a second elastomer layer having a function different from that of the first elastomeric urethane layer. It is possible to change the hardness, adhesion (rebound resilience), etc. of each layer, and to give a variety of characteristics compared to a product in which only one insulating urethane-based elastomer layer is formed. be able to. Further, it is obvious that such multilayering of the elastomer layer is not limited to two layers.

(Embodiment 4)
In the third embodiment, the polyurethane foam layer is coated with a liquid insulating urethane-based elastomer reactive composition, and is solidified by reaction to form a urethane-based elastomer layer having a first insulating property by chemical bonding. Further, the second elastomer layer is formed by chemical bonding, but the water-stopping polyurethane foam sealing material according to Embodiment 4 is characterized in that two elastomer layers are formed first.

  In the water-stopping polyurethane foam sealing material according to one embodiment of the present invention, the characteristics of the polyurethane foam layer and the elastomer layer can be arbitrarily selected according to the required function of the product, as in the first embodiment.

  First, a second elastomer layer having a function different from that of insulation is formed into a sheet shape, and subsequently, a urethane-based reactive composition is applied and reacted and solidified to have a first insulating urethane-based elastomer. Form a layer. Any of the two elastomer layers may be formed first. An unreacted urethane material (a mixture of isocyanate, polyol, foaming agent and other components) is further applied to the upper surface of the urethane-based elastomer layer having the first insulating property, and the polyurethane foam layer, An integral product is formed by a chemical reaction between the urethane-based elastomer layer having the first insulating property and the second elastomer layer.

  Also, two insulating elastomer composite layers having first and second elastomer layers having different functions are formed, and an unreacted urethane material (mixture of isocyanate, polyol, foaming agent, and other components) between them. 4 is applied and solidified, and an integrated product such as a water-stopping polyurethane foam sealing material 400 according to an embodiment of the present invention shown in FIG. 4 is obtained by a chemical reaction between an insulating urethane-based elastomer layer and a polyurethane foam layer. It may be formed.

  In the water-stopping polyurethane foam sealing material according to Embodiment 4 of the present invention, the polyurethane foam layer and the urethane-based elastomer layer having the first insulating property are bonded by a chemical reaction, and further the urethane-based material having the first insulating property. An elastomer layer and a second elastomer layer having different functions are bonded by a chemical reaction, and includes an adhesive processing step between a polyurethane foam layer and an insulating urethane-based elastomer layer, and elastomer layers having different functions. There is an excellent effect that a strong adhesion can be achieved without the need for an adhesive processing step and without any special primer treatment. Therefore, a product is provided in which the possibility of poor adhesion by the bonding method is eliminated.

  Furthermore, the water-stopping polyurethane foam sealing material according to Embodiment 4 of the present invention is a first elastomeric urethane-based elastomer layer and a first elastomeric urethane-based elastomer layer having a different function from the second elastomer. By having two layers with the layer, the hardness and adhesion (rebound resilience) of each layer can be changed, and the characteristics are better than products with only one urethane-based elastomer layer having insulating properties. Diversity can be imparted. Further, it is obvious that such multilayering of the elastomer layer is not limited to two layers.

(Embodiment 5)
In the above-described embodiment of the present invention, an example of a water-stopping polyurethane foam sealing material and a manufacturing method thereof has been shown. In this embodiment, the example which applied the water-stopping polyurethane foam sealing material to the solar cell module is shown.

  FIG. 5 is a configuration diagram of a solar cell module 500 according to Embodiment 5 of the present invention. The solar cell module 500 is configured by fitting and fixing a solar cell panel 510 to a metal frame 521 through a water-stopping polyurethane foam sealing material 530 according to Embodiment 5 of the present invention. In the solar battery panel 510, a layer 512 in which a solar battery cell 501 is protected by an encapsulant (EVA; ethylene-vinyl acetate copolymer resin) 502 includes a transparent substrate 511 typified by glass and a protective film (back sheet) 513. It is a structure sandwiched between.

  Here, the water-stopping polyurethane foam sealing material 530 according to Embodiment 5 of the present invention contacts the polyurethane foam layer 533 with the metal frame 521 so that at least the insulating urethane-based elastomer layer 531 contacts the solar cell panel 510. In this manner, the metal frame 521 is fitted. Further, an adhesive tape may be attached to the surface of the water-stopping polyurethane foam sealing material 530 that is in contact with the solar cell panel 510 and the metal frame 521.

  The solar cell module 500 according to Embodiment 5 of the present invention is a flexible polyurethane having excellent air-tightness and water-tightness and having good resilience by using the water-stopping polyurethane foam sealing material 530 according to one embodiment of the present invention. Since the foam layer 533 fixes the solar cell panel 510 with sufficient pressure without damaging it, moisture can be prevented from entering the solar cell panel 510 from the outside. Thus, the solar battery cell 501 and the EVA resin are less susceptible to deterioration due to moisture, and can be used for a longer period.

  In addition, the polyurethane foam layer 533 allows the insulating urethane-based elastomer layer 531 to be in close contact with the solar cell panel 510 at a constant pressure, so that the solar cell panel 510 and the metal frame 521 are kept in an electrically insulated state. The solar battery cell 501 can be protected from an electric shock such as a lightning strike.

  Furthermore, in the case of a composite of bonded foam and insulating resin as in a conventional product, when the solar cell panel is fitted into a metal frame, the bonded foam and insulating resin composite is bent or folded. There is a possibility that the insulating resin is peeled off, but the water-stopping polyurethane foam sealing material according to one embodiment of the present invention uses a chemical bond to bond the polyurethane foam layer and the insulating urethane-based elastomer layer. Therefore, there is no such possibility.

  In addition, in conventional products, when a composite product processed into a string shape is bent at the corner of the metal frame or bent along the curved portion of the metal frame, wrinkles are generated on the surface of the insulating resin, and the bonded foam is insulated. It was easy to create a gap at the interface with the resin. Furthermore, when there are steps or irregularities on the surface of the foam in contact with the insulating resin, a gap is likely to occur between the sealing material of the composite of foam and insulating resin and the solar cell panel. However, since the water-stopping polyurethane foam sealing material according to an embodiment of the present invention uses a chemical bond to bond the polyurethane foam layer and the urethane-based elastomer layer having insulation properties, there is no such possibility.

(Embodiment 6)
By the way, in Embodiment 5, the solar cell module was demonstrated as a representative example of an electric / electronic device. However, it is clear that the water-stopping polyurethane foam sealing material according to the present invention can be applied to other electric / electronic devices that require insulation and airtightness. Moreover, it is also clear that the water-stopping polyurethane foam sealing material according to the present invention can be applied to products in which two or more resin layers having different characteristics including foam are formed by chemical bonding.

  As an example, FIG. 6 shows a usage example of a switchboard box. FIG. 6 shows a partial cross-sectional view of the switchboard box. In the switchboard box 600, a water-stopping polyurethane foam sealant 601 according to the sixth embodiment is disposed between the switchboard box body 611 and the switchboard box door 613. The waterproofing polyurethane foam sealant 601 can be attached to the switchboard box body 611 or the switchboard box door 613 using an adhesive tape. The water-stopping polyurethane foam sealing material 601 includes an insulating urethane-based elastomer layer 603 and a polyurethane foam layer 605.

  In the water-resistant polyurethane foam sealing material 601 according to Embodiment 6 of the present invention, the insulating urethane-based elastomer layer 603 formed on the opposing surface of the polyurethane foam layer 605 is provided on the switchboard box body 611 and the switchboard box door 613. Contact each other. Thereby, the switchboard box main body 611 and the switchboard box door 613 are electrically insulated.

  In addition, the flexible and highly resilient polyurethane foam layer 605 imparted with airtightness and watertightness fixes the switchboard box body 611 and the switchboard box door 613 without damaging the switchboard box with sufficient pressure. Prevent water from entering 600.

  Further, in the conventional product, when a composite product processed into a string shape is bent at a corner portion of the metal frame or bent along a curved portion of the metal frame, wrinkles are easily generated on the surface of the insulating resin. Furthermore, when there are steps or irregularities on the surface of the foam in contact with the insulating resin, a gap is likely to occur between the sealing material of the composite of foam and insulating resin and the solar cell panel. However, since the water-stopping polyurethane foam sealing material according to an embodiment of the present invention uses a chemical bond to bond the polyurethane foam layer and the urethane-based elastomer layer having insulation properties, the foam bonded like a conventional product. There is no possibility that the insulating resin is peeled off or a gap is formed at the interface between the adhered foam and the insulating resin. It is clear that the above-described effects can be expected in other electrical / electronic equipment sealing materials such as electrical refrigerator sealing materials.

Example 1
In the examples, a polyurethane layer A (apparent density 60 kg / m ³ ) and a thickness of 2.5 mm are used as the polyurethane foam, and a urethane insulating layer having a thickness of 0.3 mm is used as the insulating urethane-based elastomer layer C. A sample compressed to 1 mm was prepared for packing specifications.

  Examples of urethane resins for casting electrical parts for urethane-based elastomers having insulating properties include Nisshin Resin Co., Ltd. ADAPT-E series and Hitachi Chemical Co., Ltd. KU-7000 series.

(Comparative Examples 1-4)
In Comparative Examples 1 to 4, as the polyurethane foam, the polyurethane layer A (apparent density 60 kg / m ³ ), the thickness 2.5 mm, the polyurethane layer B (apparent density 48 g / m ³ ), the thickness 2.5 mm, and the EPDM layer (Appearance density 140kg / m ³ ), thickness 2.5mm, urethane insulating layer C as insulation urethane-based elastomer layer C, thickness 0.3mm and insulation film D as butyl tape, thickness 0.5mm Were prepared as shown in Table 1.

(Evaluation by withstand voltage measurement)
With respect to Example 1 and Comparative Examples 1 to 4, withstand voltage measurement was performed to evaluate the product. FIG. 7 is a schematic diagram of withstand voltage measurement. An evaluation material 701 was sandwiched between the upper electrode 751 and the lower electrode 753, and withstand voltage measurement was performed under the following measurement conditions.
Withstand voltage measuring machine: Kikusui Electronics TOS 5101
Sample size: Thickness x 60 square top electrode size: 70 μm Copper foil x φ29
Lower electrode size: Iron 3.2t plate × 80 × 120
Voltage (AC): 1 to 5 kv, 1 kv / 30 sec Step-up cut current value: 2 mA
Measurement atmosphere: 25 ° C, 50% RH

(Evaluation by still water test)
Furthermore, the product was evaluated by conducting a U-shaped water stop test for Example 1 and Comparative Examples 1 to 4. FIG. 8 is a schematic diagram of a U-shaped water stop test. A sample 801 punched into a U-shape was sandwiched between two smooth acrylic plates 803, water 805 was added to the U-shaped sample 801, and a water stop test was performed under the following measurement conditions.
U sample width: 10 mm
Compression rate of foam: 50%
Water level: 50 mm
Measurement time: 24 hours

Table 1 shows the withstand voltage measurement results and evaluations of Example 1 and Comparative Examples 1 to 4.

  As mentioned above, the Example by the combination of the polyurethane-type elastomer layer C which has the polyurethane layer A + insulating property showed the withstand voltage characteristic higher than Comparative Examples 1-4. Moreover, the insulating elastomer layer showed high withstand voltage characteristics despite its thinner thickness than the insulating tape.

DESCRIPTION OF SYMBOLS 100 Water-resistant polyurethane foam sealing material 101 Polyurethane foam layer 111 Urethane-type elastomer layer which has insulation 200 Water-resistant polyurethane foam sealing material 201 Polyurethane foam layer 211 Urethane-type elastomer layer which has insulation 300 Water-resistant polyurethane foam sealing material 301 Polyurethane foam Layer 311 Insulating urethane-based elastomer layer 321 Elastomer layer 400 Water-resistant polyurethane foam sealing material 401 Polyurethane foam layer 411 Insulating urethane-based elastomer layer 421 Elastomer layer 500 Solar cell module 501 Solar cell 502 Sealing material 510 Sun Battery panel 511 Transparent substrate 512 Protected layer 513 Protective film 521 Metal frame 530 Waterstop Urethane elastomer layer 533 Polyurethane foam layer 600 Switchboard box 601 Water-resistant polyurethane foam seal material 603 Urethane elastomer layer 605 polyurethane foam layer 611 Switchboard box body 613 Switchboard box door 701 Evaluation Material 751 Upper electrode 753 Lower electrode 801 U-shaped sample 803 Acrylic plate 805 Water 900 Solar cell module 901 Solar cell 902 Sealant 910 Solar cell panel 911 Transparent substrate 912 Protected layer 913 Protective film 921 Metal frame 931 Seal material

Claims (7)

A polyurethane foam layer having a water-stopping property;
Having a urethane-based elastomer layer having insulating properties,
The water-resistant polyurethane foam sealing material, wherein the polyurethane foam layer and the urethane elastomer layer are in close contact with each other by chemical bonding. The water-stopping polyurethane foam sealing material according to claim 1, wherein an elastomer layer having different functions is in close contact with the urethane elastomer layer by chemical bonding. The water-stopping polyurethane foam sealing material according to claim 1 or 2, wherein the water-stopping polyurethane foam sealing material is a sealing material for electric and electronic equipment. The water-stopping polyurethane foam sealing material according to any one of claims 1 to 3, wherein the water-stopping polyurethane foam sealing material is a sealing material for electric and electronic devices having an adhesive tape on one side or both sides. The water-stopping polyurethane foam sealing material according to any one of claims 1 to 4, wherein the water-stopping polyurethane foam sealing material is a sealing material for an electric refrigerator. The water-stopping polyurethane foam sealing material according to any one of claims 1 to 4, wherein the water-stopping polyurethane foam sealing material is a sealant for a switchboard box. The water-stopping polyurethane foam sealing material according to any one of claims 1 to 4, wherein the water-stopping polyurethane foam sealing material is a sealing material for a solar cell module.

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