JPH0940811A - Thermally penetrable resin composition and heat-insulation sheet for goose asphalt pavement - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a thermally penetrable resin composition having excellent thermal penetrability in a heat-insulation sheet for pavement, high flexibility at low temperature and high adhesivity to asphalt or steel floor plate. SOLUTION: This thermally penetrable resin composition is a compounded composition composed mainly of a thermoplastic synthetic rubber, a tackifier resin and asphalt and has a softening point of 70-120 deg.C and a melt viscosity of 500-3,000mPa.s at 180 deg.C. The heat-insulation sheet for goose asphalt is produced by laminating and integrating a sheet of the thermally penetrable resin composition on one or both surfaces of a heat-resistant nonwoven cloth. The sheet is effective for preventing the thermal strain of a steel floor plate in a paving process using goose asphalt e.g. an iron bridge and an elevated highway constructed by using a steel floor plate.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a heat permeable resin composition and a heat insulating sheet for goose asphalt pavement,
Especially when paving goose asphalt, etc. on a resin composition and steel floor slab that have excellent heat permeability to a heat insulating sheet made of a heat-resistant non-woven fabric for pavement, waterproofing, etc. The present invention relates to a heat insulating sheet which has excellent adhesiveness to goose asphalt and steel floor slabs, low temperature flexibility, etc.

[0002]

2. Description of the Related Art In steel bridges and elevated roads using steel floor slabs,
Along with the increase in traffic volume, a pavement method using goose asphalt, which is more durable and waterproof than general asphalt pavement and can be reduced in maintenance frequency, has been used in recent years. However, goose asphalt is 220-2
Since the steel floor slab is directly subjected to the high heat of the goose asphalt at this time because it is cast at a high temperature of 50 ° C., there is a risk that the steel floor slab will suffer thermal distortion and the like. Therefore, in order to avoid this thermal strain, development of a heat insulating sheet for goose asphalt pavement having excellent heat resistance has been demanded. Moreover, for the permeable resin used in combination with this heat insulating sheet, without impairing the heat insulating performance of the heat insulating sheet,
Excellent heat permeability and adhesion to goose asphalt and steel floor slabs are required.

According to Japanese Patent Laid-Open No. 05-112904, a rubber asphalt layer mixed with a mineral powder is provided on the upper surface of a heat insulating sheet, and 220 ° C. when goose asphalt is cast.
It has been proposed to prevent heat of ~ 250 ° C from directly conducting to the steel deck. The rubber asphalt proposed here has a melting point of about 70 to 80 ° C., and by mixing mineral powder, the melting point is 110 to 16 ° C.
It is excellent in that it can be heated up to 0 ° C and the viscosity becomes high. However, with this method, when the high-temperature goose asphalt is placed unless the mineral powder is uniformly mixed, the rubber asphalt easily softens, flows and flows out from the heat insulation sheet, and sufficient practical strength can be exhibited. Absent. Further, there is a problem that the plane tensile adhesion strength with the steel floor slab is weak.

On the other hand, when general asphalt pavement is applied to concrete floor slabs and the like, construction of a waterproof sheet for road pavement is obligatory in order to prevent deterioration of the floor slab due to permeation of rainwater. This waterproof sheet usually uses a polyester non-woven fabric as a support, and by impregnating this with an asphalt-based resin, it has waterproof performance, and the surface is coated with an adhesive resin in a laminated coating. It is designed to adhere to the floor slab. The tarpaulin for road pavement has a general asphalt casting temperature of 150 ° C.
It is low in degree, and its purpose is to focus on waterproofing and adhesion to floor slabs, etc., so it lacks heat resistance and heat insulation, and cannot be used for goose asphalt pavement that is driven at high temperatures. . Further, the resin used for it also has a low softening point as a physical property of the compounded resin for such purpose,
A resin with a low melt viscosity that does not crack at low temperatures is compounded.

[0005]

With such a resin composition,
When high-temperature goose asphalt is cast, the resin easily softens and flows to flow out from the heat insulating sheet, failing to exhibit sufficient practical strength. Further, since this resin composition is too soft and has high creep properties, practical adhesive strength to a steel floor slab cannot be obtained. In addition, in a compounded composition of a resin that easily softens and flows, there is a problem in that the heat conductivity is so high that the heat insulating performance of the heat insulating sheet is impaired. Therefore, an object of the present invention is to apply or laminate integrally to a heat insulating sheet for pavement or the like required when placing high-temperature asphalt, etc., and thus have excellent heat permeability, low temperature flexibility, and particularly goose. It is intended to provide a heat permeable resin composition for a heat insulating sheet, which exhibits adhesion to asphalt and steel floor slabs, high temperature flow resistance and the like, and a heat insulating sheet for goose asphalt pavement.

[0006]

Means for Solving the Problems The present inventors have completed the present invention as a result of intensive studies to solve the above problems. That is, the present invention is a compounded resin composition containing a thermoplastic synthetic rubber, a tackifying resin, and asphalt as main components, and having a softening point of 70 to 120 ° C and a melt viscosity of 180 ° C.
In the above, the heat permeable resin composition and the heat permeable resin sheet described above are laminated and integrated on one or both sides of the heat permeable resin composition and the heat insulating sheet, wherein the heat permeable resin composition is 500 mPa · s to 3000 mPa · s (m represents millimeter). The present invention relates to a heat insulating sheet for goose asphalt pavement.

Hereinafter, the present invention will be described in detail. The heat insulating sheet of the present invention is made of a heat-resistant non-woven fabric having a thickness of about 1 to 5 mm, which is made of mineral fibers such as rock wool and glass fiber, and organic fibers having heat resistance. The heat permeable resin composition of the present invention is used in combination with such a heat insulating sheet. At this time, the desirable condition of the permeable resin is that the heat of the goose asphalt or the like placed on the upper part of the heat insulating sheet can sufficiently impregnate the sheet, and after the impregnation is finished, the goose asphalt can be used. And also firmly adheres to the steel floor slab, and the adhesive strength at 20 ° C. is 5 kgf / cm ² or more, preferably 6 k.
gf / cm ² or more [Japan Road Association (January 1987):
"Road bridge reinforced concrete floor slab waterproof layer design and construction materials"
P. 13 Refer to the standard of quality standard], and it is required that the heat at the time of pouring goose asphalt is difficult to be directly transmitted to the steel floor slab.

As a heat-penetrating resin for a heat insulating sheet which satisfies the above conditions, the present invention is a compounded resin composition containing a thermoplastic synthetic rubber, a tackifying resin and various asphalts as main components, and particularly a softening point of 70. 500 mPa · s to 3000 mPa · at a melt viscosity of 180 ° C.
s. Here, as the thermoplastic synthetic rubber, styrene-butadiene rubber, butadiene rubber,
Diene rubbers such as isoprene rubbers, butyl rubbers, olefin rubbers such as ethylene-propylene rubbers, and the like, and more preferably high molecular weight styrene thermoplastic elastomers SIS (styrene / isoprene / styrene) and SBS (styrene).・ Butagen ・ styrene),
Examples include SEPS (styrene / ethylene / propylene / styrene) and SEBS (styrene / ethylene / butylene / styrene). In addition to these elastomers,
Rubber asphalt obtained by hot-melt blending asphalt, process oil and the like having appropriate quality can also be preferably used as one kind of thermoplastic synthetic rubber. Such rubber asphalt is more preferable because the compatibility with the tackifying resin and the asphalts when mixed and melted is enhanced.
Rubber asphalt is generally commercially available, and commercially available rubber asphalt can be preferably used. As these thermoplastic synthetic rubbers, a high molecular weight type having a particularly high softening point (180 ° C. or higher) is preferable. The thermoplastic synthetic rubber has flexibility at a low temperature, has less flow at a high temperature, and can impart a basic cohesive force of the permeable resin. However, although the thermoplastic synthetic rubber base is essentially softened and melted by the heat when the goose asphalt or the like is placed, it is difficult to sufficiently melt and impregnate it into the heat insulating sheet.

In order to modify the melt impregnability of these thermoplastic synthetic rubbers, it is necessary to combine a tackifying resin. This makes it possible to impart adhesiveness to the steel floor slab and goose asphalt. Examples of the tackifying resin used in the present invention include natural rosin and rosin ester-modified products which are derivatives thereof, such as a petroleum-based product having a carbon number of C.
Examples include terpene resins and modified terpene resins, terpene copolymer resins, and the like, such as aliphatic hydrocarbon resins which are 5, C9, and C5 / C9 copolymer resins, aromatic hydrocarbon resins, and the like. The softening point of the tackifying resin is preferably 50 ° C to 150 ° C. The tackifying resin used in the present invention may be selected depending on the type of the above-mentioned thermoplastic synthetic rubber, taking into consideration the properties such as compatibility of individual resins and heat stability, and these may be used alone or in combination. Can be used.

As described above, by combining the thermoplastic synthetic rubber and the tackifying resin, it is possible to reduce the melt viscosity and improve the melt impregnation property into the heat insulating sheet. But,
If the blending ratio of the tackifying resin is increased in order to modify the melt impregnability, the penetrating resin is cracked at a low working temperature of 5 ° C. or less, such as in winter, and at the same time tearing of the heat insulating sheet occurs. Therefore, in order to compensate for this drawback, various asphalts are further used as the melt impregnating modifier in the present invention. Examples of the asphalt used here include straight asphalt and blown asphalt. The blending ratio of each composition described above is appropriately determined so as to satisfy the melt viscosity and the softening point described below, but the total is 100
When the amount is parts by weight, the thermoplastic synthetic rubber is 7 to 50 parts by weight as rubber asphalt, and the tackifying resin is 10 to 30 parts by weight.
It is desirable to properly mix 20 parts by weight, 20 to 50 parts by weight of blown asphalt, 0 to 40 parts by weight of straight asphalt, and 0 to 5 parts by weight of process oil.

The melt viscosity of the heat permeable resin composition for a heat insulating sheet of the present invention is 500 mPa · s-3 at 180 ° C.
It is necessary to be included within the range of 000 mPa · s.
When the melt viscosity at 180 ° C is 500 mPa · s or less, the heat-insulating sheet has good impregnation property, but since the resin film has a high embrittlement temperature, the sheet is inflexible and, as a result, cracks at low temperatures. And sufficient adhesive strength cannot be obtained at room temperature. As a result, the heat insulation sheet is -5
It cannot be used at a low temperature of about ℃, and its commercial value is poor and its commercial value is impaired. If the melt viscosity at 180 ° C is 3000 mPa · s or more, 250
When the goose asphalt heated and melted at ℃ is cast, the permeable resin does not sufficiently penetrate into the inside of the nonwoven fabric due to the heat of the goose asphalt, resulting in delamination of the nonwoven fabric, and therefore sufficient adhesive strength cannot be obtained. .

The softening point of the heat permeable resin composition for heat insulating sheets of the present invention must be in the range of 70 ° C to 120 ° C. If the softening point is below 70 ° C,
When the goose asphalt that was heated and melted at 250 ° C was placed, the resin melted and softened too much and flowed between the original adherend, the goose asphalt and the iron plate, resulting in sufficient adhesive strength. Not at the same time,
In actual use, it cannot be used because the adhesive strength decreases due to the temperature rise of goose asphalt or the iron plate in the sunlight in the summer. Also, when the softening point is 120 ° C or higher, the resin on the side of the heat insulating sheet iron plate may not be sufficiently heated depending on the situation when the goose asphalt that has been heated and melted at 250 ° C is placed, resulting in insufficient softening and sufficient resin. Since it does not penetrate into the inside of the nonwoven fabric, delamination of the nonwoven fabric occurs, and as a result, sufficient adhesive strength cannot be obtained.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The heat permeable resin composition for a heat insulating sheet of the present invention can be applied to both sides of a heat insulating sheet in a heat-melted state, sprayed, etc., but preferably molded into a sheet shape. It is used by stacking it on one or both sides of the heat insulating sheet. A heat-insulating sheet laminated on one or both sides is preferably used as it is as a high-heat heat-insulating sheet when paving goose asphalt on a steel floor slab as it is.

[0014]

EXAMPLES Details of the present invention will be described below with reference to examples and comparative examples. Embodiment 1 FIG. As thermoplastic synthetic rubber, 10 parts by weight of commercially available rubber asphalt (Califlex TR1101 manufactured by Shell Japan Co., Ltd.) based on SBS synthetic rubber, 25 parts by weight of straight asphalt, commercially available Bron asphalt (Showa Shell Sekiyu KK )) 40 parts by weight, as a tackifying resin, 20 parts by weight of a commercially available natural rosin ester resin (FGM-21, manufactured by Arakawa Chemical Co., Ltd.), 5 parts by weight of process oil, and the like are melted, mixed and heated. A permeable resin composition was obtained. When the softening point was measured by the ring and ball method (R & B method), it was 91 ° C. The melt viscosity of this permeable resin was measured with a Brookfield RVT viscometer to find that it was 5000 mPa · s at 160 ° C.
It was 1425 mPa · s at 180 ° C. Next, this permeable resin is formed into a sheet having a thickness of 1 mm, and the formed sheet is cut into a width of 30 mm and a length of 250 mm,
After being left at each of the following temperatures for 24 hours or more, it was wrapped around a metal pipe having an outer diameter of 25 mm at the same temperature, and the low temperature flexibility was determined by the presence or absence of cracks in the formed sheet.
No cracking of the sheet was observed at any of -5 ° C, 0 ° C and 20 ° C.

This permeable resin sheet is used as a rock wool type heat insulating sheet nonwoven fabric (Rocktex 116-made by Nippon Steel Chemical Co., Ltd.).
1/2) was laminated on both surfaces and integrated to prepare a heat insulating sheet. Next, this heat insulation sheet is 300 mm x 300 m
It was cut into a size of m, placed on an iron plate having the same size and a thickness of 12 mm, and left at room temperature. A commonly used goose asphalt for road pavement was heated and melted at 250 ° C. and cast to a thickness of 40 mm to prepare a test body having a structure shown in FIG. 1. That is, in FIG.
1 is goose asphalt, 2 is heat permeable resin sheet,
Reference numeral 3 is an iron plate, and 4 is a rock wool heat insulating sheet. This is left for 48 hours at 20 ℃, the backside temperature of the iron plate is 20 ℃
After confirming that it became, it cuts from the upper surface of the goose asphalt with an asphalt core cutter with an outer diameter of 100 mm until it reaches the iron plate surface, and this part is cut with a Kenken-type adhesive strength measuring machine. The planar tensile bond strength at 0 ° C. was measured and found to be 6.0 kg / cm ² . Here, when the test piece after the measurement of the plane tensile adhesive strength was observed, the penetrating resin was sufficiently penetrated and integrated into the inside of the rock wool-based nonwoven fabric. Table 1 shows the results.

Embodiment 2 FIG. The same compositions as those used in Example 1 were used, and only the blending amount was changed as shown in Table 1 and the mixture was heated and melt mixed to obtain a heat permeable resin composition. The physical properties of this resin were measured in the same manner as in Example 1. The softening point: 94 ° C., melt viscosity: 160 ° C. 600
It was 0 mPa · s and 1700 mPa · s at 180 ° C. Next, this permeable resin was molded into a sheet having a thickness of 1 mm, and low-temperature flexibility was determined by the same method as in Example 1. The sheet cracked at any of -5 ° C, 0 ° C, and 20 ° C. Was not recognized at all. A heat insulating sheet was produced in the same manner using the same nonwoven fabric as in Example 1 for this heat permeable resin sheet. Next, using this heat insulating sheet, the same iron plate and goose asphalt for road pavement as in Example 1 were used to fabricate a test body having a structure as shown in FIG. 1 in the same manner. When the planar tensile bond strength at 20 ° C. of this test piece was measured by the same method as in Example 1, it was 7.8 kg / cm ² . Further, when the test piece after the measurement of the plane tensile adhesive strength was observed, the permeable resin was sufficiently penetrated into the inside of the rock wool-based nonwoven fabric and was integrated. Table 1 shows the results.

Example 3 The same compositions as used in Example 1 were used, and only the blending amount was changed as shown in Table 1 to perform heat-melt mixing to obtain a heat-permeable resin composition. The physical properties of this resin were measured in the same manner as in Example 1. The softening point was 79.
° C, melt viscosity: 2500 mPa · s at 160 ° C, 180
It was 600 mPa · s at ° C. Next, this permeable resin was molded into a sheet having a thickness of 1 mm, and low-temperature flexibility was determined by the same method as in Example 1. The results were -5 ° C, 0 ° C, and 2 ° C.
No cracking of the sheet was observed at any of 0 ° C. The same nonwoven fabric as in Example 1 was used for this permeable resin sheet, and a heat insulating sheet was produced in the same manner. Next, using this heat insulating sheet, the same iron plate and goose asphalt for road pavement as in Example 1 were used to fabricate a test body having a structure as shown in FIG. 1 in the same manner. When the planar tensile bond strength at 20 ° C. of this test piece was measured by the same method as in Example 1, it was 5.6 kg / cm ² . Further, when the test piece after the measurement of the plane tensile adhesive strength was observed, the permeable resin was sufficiently penetrated into the inside of the rock wool-based nonwoven fabric and was integrated. Table 1 shows the results. The heat permeable resin compositions shown in Examples 1 to 3 above,
It was confirmed that the heat insulating sheet was well impregnated and the adhesive strength was 5 kg / cm ² or more.

Comparative Example 1 The same compositions as those used in Example 1 were used, and only the blending amount was changed as shown in Table 1 and the mixture was heated and melt mixed to obtain a heat permeable resin composition. The physical properties of this resin were measured in the same manner as in Example 1. The softening point was 67 ° C. and the melt viscosity was 160 ° C.
mPa · s, 180 mPa · s at 180 ° C. Next, this permeable resin is molded into a sheet with a thickness of 1 mm,
When the low temperature flexibility was judged by the same method as in Example 1, the cracking of the sheet was recognized at -5 ° C and 0 ° C, and the cracking of the sheet was not recognized at 20 ° C. A heat insulating sheet was produced in the same manner using the same nonwoven fabric as in Example 1 for this heat permeable resin sheet. Next, using this heat insulating sheet, the same iron plate and goose asphalt for road pavement as in Example 1 were used to fabricate a test body having a structure as shown in FIG. 1 in the same manner. When the planar tensile bond strength at 20 ° C. of this test piece was measured by the same method as in Example 1, it was 2.0 kg / cm ² . Further, when the test piece after the measurement of the plane tensile adhesive strength was observed, the permeable resin was sufficiently penetrated into the inside of the rock wool-based nonwoven fabric and was integrated. Table 1 shows the results.

Comparative Example 2 The same compositions as those used in Example 1 were used, and only the blending amount was changed as shown in Table 1 and the mixture was heated and melt mixed to obtain a heat permeable resin composition. The physical properties of this resin were measured in the same manner as in Example 1. The softening point was 78 ° C. and the melt viscosity was 160 ° C.
The mPa · s was 300 mPa · s at 180 ° C. Next, this permeable resin is molded into a sheet with a thickness of 1 mm,
When the low temperature flexibility was judged by the same method as in Example 1, the cracking of the sheet was recognized at -5 ° C and 0 ° C, and the cracking of the sheet was not recognized at 20 ° C. The same nonwoven fabric as in Example 1 was used for this permeable resin sheet, and a heat insulating sheet was produced in the same manner. Next, using this heat insulating sheet, the same iron plate and goose asphalt for road pavement as in Example 1 were used to fabricate a test body having a structure as shown in FIG. 1 in the same manner. When the plane tensile adhesive strength at 20 ° C. of this test piece was measured by the same method as in Example 1,
It was 3.0 kg / cm ² . Further, when the test piece after the measurement of the plane tensile adhesive strength was observed, the permeable resin was sufficiently penetrated into the inside of the rock wool-based nonwoven fabric and was integrated. Table 1 shows the results.

Comparative Example 3 The same compositions as those used in Example 1 were used, and only the blending amount was changed as shown in Table 1 and the mixture was heated and melt mixed to obtain a heat permeable resin composition. The physical properties of this resin were measured in the same manner as in Example 1. The softening point: 83 ° C., melt viscosity: 160 ° C., 800
It was 0 mPa · s and 3800 mPa · s at 180 ° C. Next, this permeable resin was molded into a sheet having a thickness of 1 mm, and the flexibility at low temperature was evaluated by the same method as in Example 1. As a result, cracking of the sheet was recognized at -5 ° C, 0 ° C, and 20 ° C. There wasn't. The same nonwoven fabric as in Example 1 was used for this permeable resin sheet, and a heat insulating sheet was produced in the same manner. Next, using this heat insulating sheet, the same iron plate and goose asphalt for road pavement as in Example 1 were used to fabricate a test body having a structure as shown in FIG. 1 in the same manner. When the planar tensile bond strength at 20 ° C. of this test piece was measured by the same method as in Example 1, it was 3.3 kg / cm ² . Further, when the test piece after the measurement of the plane tensile adhesive strength was observed, the permeable resin did not penetrate into the inside of the rock wool-based nonwoven fabric, and it was broken at that portion. Table 1 shows the results.

[0021]

[Table 1]

Examples 4 to 6 As the thermoplastic synthetic rubber, commercially available rubber asphalt based on SBS type synthetic rubber (Showa Shell Sekiyu KK)
Commercially available blown asphalt (manufactured by Showa Shell Sekiyu KK) as a melt impregnating modifier, straight asphalt, commercially available natural rosin ester resin as a tackifying resin (Arakawa Chemical Co., Ltd., FGM- 21) was adjusted at the compounding ratio shown in Table 2 and mixed by heating and melting to obtain a heat permeable resin composition. The softening point is measured by the ring and ball method (R & B method), and the melt viscosity of the permeable resin is measured by using a Brookfield RVT viscometer. Next, this permeable resin was molded into a sheet having a thickness of 1 mm, and the molded sheet was judged to have low-temperature flexibility under the same conditions as in Example 1, and at any of -5 ° C, 0 ° C, and 20 ° C. No cracking of the sheet was observed.
Further, this permeable resin sheet was laminated on both sides of the same rock wool-based heat insulating sheet nonwoven fabric as in Example 1 to be integrated, and a heat insulating sheet was produced, and a goose asphalt for road paving was placed under the same conditions as in Example 1. After being made into a test body, the planar tensile bond strength at 20 ° C. was measured with a Kenken-type bond strength measuring machine, and it was 6.0 kg / cm ² . Here, when the test piece after the measurement of the plane tensile adhesive strength was observed, the permeable resin was sufficiently penetrated into the inside of the rock wool-based nonwoven fabric to be integrated. Table 2 shows the results.

Comparative Examples 4 to 6 The same compositions as those used in Examples 4 to 6 were used, only the blending amount was changed as shown in Table 2 and the mixture was heated and melt mixed to obtain a heat permeable resin composition. . This resin was tested under the same conditions and methods as in Example 4, and the measurement results of the physical properties thereof are also shown in Table 2.

[0024]

[Table 2]

[0025]

The heat permeable resin of the present invention is applied, sprayed, or laminated integrally on a heat insulating sheet in a sheet form so that the temperature of 220 ° C. when goose asphalt or the like is cast is increased.
The heat of 250 ° C does not directly transfer to the steel floor slab, but the heat of the cast goose asphalt on the other hand softens and melts the heat permeable resin to fully impregnate the inside of the heat insulating sheet, and then the steel floor slab It adheres firmly and its adhesive strength is 5k at 20 ° C.
It exhibits a practical strength of gf / cm ² or more and is excellent in low temperature flexibility. Therefore, the heat permeable resin composition of the present invention is effective for a heat insulating sheet or the like that does not cause thermal distortion or the like in the steel floor slab in the pavement method using goose asphalt in an iron bridge or an elevated road using the steel floor slab. is there.

[Brief description of drawings]

FIG. 1 is a view showing a test body in which a heat insulating sheet is placed on an iron plate and a goose asphalt for road paving is placed.

[Explanation of symbols]

 1 Goose asphalt 2 Permeable resin sheet 3 Iron plate 4 Rockwool type non-woven sheet

Claims (4)

[Claims] 1. A compounded resin composition comprising a thermoplastic synthetic rubber, a tackifying resin and asphalt as main components,
5 at a softening point of 70 to 120 ° C. and a melt viscosity of 180 ° C.
The heat permeable resin composition is characterized in that it is from 00 mPa · s to 3000 mPa · s. 2. The heat permeable resin composition according to claim 1, wherein the thermoplastic synthetic rubber has a softening point of 180 ° C. or higher and the tackifying resin has a softening point of 50 to 150 ° C. 3. A heat-penetrating material for a heat insulating sheet, which is obtained by molding the heat-penetrating resin composition according to claim 1 or 2 into a sheet shape. 4. A heat insulating sheet for goose asphalt pavement, wherein the heat-penetrating material according to claim 3 is laminated and integrated on one side or both sides of the heat insulating sheet.