Insulation

Abstract

To provide a heat insulating material that suppresses uneven coating of an anti-slip agent and has excellent anti-slip properties and heat shielding properties.SOLUTION: In a heat insulating material consisting of a core material made of synthetic resin foam and a face material laminated on at least one side, the face material is a laminated face material having at least a radiant heat reflective layer and an anti-slip layer. The anti-slip layer is provided so as to be located outside the radiant heat reflective layer and on the outermost surface of the heat insulating material. The anti-slip layer includes an anti-slip agent and a synthetic resin with an average particle size of 1 mm or less. The coefficient of static friction between the anti-slip layer of the face material and ordinary plywood is 0.49 or more, and the dispersion V is 0.002 or less. The coefficient of dynamic friction between the anti-slip layer of the face material and the ordinary plywood is 0.49 or more, and the dispersion V is 0.001 or less.SELECTED DRAWING: Figure 1

Description

Technical Field

[0004]

[0001] The present invention relates to a heat insulating material used for wall surfaces, floor surfaces, roofs, etc. of detached houses and the like.

Background Art

[0002] A heat insulating material in which facing materials are laminated on both sides of a core material made of a synthetic resin foam is used as a heat insulating material for wall surfaces, floor surfaces, and roofs of detached houses and the like. For example, a heat insulating material is known in which a metal layer is laminated on the surface of the facing material to reflect sunlight and impart heat shielding properties (Patent Document 1). By the way, among heat insulating materials, the heat insulating material used for roofs is often such that a worker rides on the heat insulating material during construction work. At that time, if the worker's feet are likely to slip, there is a risk of serious injuries such as falls and drops from heights. Therefore, conventionally, a countermeasure has been proposed in which an anti-slip agent such as sand is applied to the facing material of the heat insulating material to perform an anti-slip treatment (Patent Documents 2 to 4).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

[0005] The present invention has been made in view of the above, and aims to provide a thermal insulation material that suppresses unevenness in the coating of anti-slip agents and has excellent anti-slip properties and heat-shielding properties. [Means for solving the problem]

[0006] The present inventors, after diligently studying with the aim of solving the above problems, have found that a thermal insulation material having a core material made of synthetic resin foam with a surface material laminated on at least one side thereof, wherein the surface material is a laminated surface material having at least a radiant heat reflective layer and an anti-slip layer, wherein the anti-slip layer is provided outside the radiant heat reflective layer and located on the outermost surface of the thermal insulation material, wherein the anti-slip layer has an anti-slip agent with an average particle diameter of 1 mm or less and a synthetic resin, wherein the static friction coefficient between the anti-slip layer of the surface material and ordinary plywood is 0.49 or more and the dispersion V is 0.002 or less, and the dynamic friction coefficient between the anti-slip layer of the surface material and ordinary plywood is 0.49 or more and the dispersion V is 0.001 or less, can suppress unevenness in the coating of the anti-slip agent, has excellent anti-slip properties and excellent heat shielding properties, and has completed the present invention.

[0007] In other words, the present invention is (1) A thermal insulation material comprising a core material made of synthetic resin foam with a facing material laminated on at least one side thereof, The aforementioned surface material is a laminated surface material having at least a radiant heat reflective layer and an anti-slip layer. The anti-slip layer is provided outside the radiant heat reflective layer and located on the outermost surface of the heat insulating material. The anti-slip layer comprises an anti-slip agent with an average particle diameter of 1 mm or less and a synthetic resin. The static friction coefficient between the anti-slip layer of the aforementioned surface material and the ordinary plywood is 0.49 or higher, and the dispersion V is 0.002 or lower. The coefficient of dynamic friction between the anti-slip layer of the aforementioned surface material and the ordinary plywood is 0.49 or higher, and the dispersion V is 0.001 or lower. An insulating material characterized by the following: (2) The thermal insulation material according to (1), characterized in that the surface material is laminated on both sides of the core material, and one of the surface materials does not include the anti-slip layer. (3) The thermal insulation material according to (1), characterized in that the synthetic resin foam is at least one selected from the group consisting of polyurethane foam, polyphenol foam, and polystyrene foam. (4) The heat insulating material according to (1), characterized in that the radiant heat reflective layer is at least one selected from the group consisting of metal foil alone, a composite of paper or plastic film and metal foil, and a composite of paper or plastic film and metal vapor deposition. That is the case. [Effects of the Invention]

[0008] The thermal insulation material of the present invention has a small dispersion V value calculated by measuring the coefficient of friction at multiple locations on a surface material having an anti-slip layer. Therefore, the anti-slip agent is uniformly dispersed throughout the surface material, resulting in less unevenness in the anti-slip agent coating, excellent anti-slip properties, and excellent heat shielding properties. Thus, it can be suitably used as thermal insulation material for roofs and the like. [Brief explanation of the drawing]

[0009] [Figure 1] This is a perspective view showing a thermal insulation material 1 according to Embodiment 1 of the present invention. [Figure 2] This is a perspective view of a roof insulation structure including an insulation material 1 according to Embodiment 1 of the present invention. [Figure 3] This figure shows the insulation material 1 according to Embodiment 1 of the present invention being actually laid by a contractor. [Figure 4] (a) is a photograph of the surface of the thermal insulation material 1 according to Example 1. (b) is a photograph of the surface of the thermal insulation material according to Comparative Example 1. [Figure 5] (a) is a photograph of the surface of the thermal insulation material 1 according to Example 1, magnified 10 times. (b) is a photograph of the surface of the thermal insulation material according to Comparative Example 1, magnified 10 times. [Modes for carrying out the invention]

[0010] [Insulation material] As shown in FIG. 1, the heat insulating material 1 of Embodiment 1 of the present invention has facing materials 4 and 4' laminated on both sides of a core material 2. One of the facing materials 4 is a laminated facing material of a radiant heat reflecting layer 41 and an anti-slip layer 42, and the other facing material 4' is only a radiant heat reflecting layer 41. The anti-slip layer 42 is kneaded with an anti-slip agent 6 and a synthetic resin 8, and is provided outside the radiant heat reflecting layer 41 and located on the outermost surface of the heat insulating material.

[0011] The heat insulating material 1 of Embodiment 1 is applied to, for example, the heat insulating structure of a roof as shown in FIG. 2. FIG. 2 shows that after passing the lower purlin 92 over the eaves 91, laying the heat insulating material 1 thereon, passing the upper purlin 94 corresponding to the lower purlin 92 over the heat insulating material 1, further attaching the sheathing board 95 over the upper purlin 94, laying the waterproof paper 96 from above the sheathing board 95, and further performing a water stop treatment with a waterproof tape 97 at the joint portion of the heat insulating material 1. Then, as shown in FIG. 3, the constructor rides on the already laid heat insulating material 1 and lays other heat insulating materials. Also, when passing the upper purlin 94 over the heat insulating material 1 or attaching the sheathing board 95 over the upper purlin 94, the constructor rides on the already installed heat insulating material 1 and attaches the sheathing board 95.

[0012] <Core material> The heat insulating material 1 of Embodiment 1 has a core material 2 made of a synthetic resin foam. Examples of such synthetic resin foams include plastic-based heat insulating materials such as polyurethane foam, polyphenol foam, polystyrene foam, and polyethylene foam, as well as glass wool, rock wool, and cellulose fiber. Among these synthetic resin foams, polyurethane foam, polyphenol foam, and polystyrene foam, which are easy to airtight for preventing dew condensation and condensation, are preferable, and polyurethane foam with high strength is more preferable.

[0013] As the polyurethane foam, for example, those having a thermal conductivity of 0.024 W / (m·K) or less are preferable. The polyurethane foam having a thermal conductivity in this range has excellent heat insulating performance, and an improvement in the heat insulating effect of the heat insulating material 1 can be expected.

[0014] <Face material> The face material 4 is laminated on at least one side of the core material 2 and is a laminated face material having at least a radiant heat reflecting layer 41 and an anti-slip layer 42. As the face material 4, those that can be expected to have the effects of heat insulation and / or dew condensation prevention are used. The face material 4 may be laminated alone or in combination of a plurality. In the present invention, heat insulation means reflecting radiant heat (in summer, reflecting the radiant heat emitted from sunlight to the outdoor side, and in winter, reflecting the radiant heat emitted from heating equipment used indoors to the indoor side), and dew condensation prevention means blocking the moisture permeability of water vapor flowing in the building body in the temperature difference and humidity environment between the outside and inside. Since the temperature and humidity inside and outside the building are reversed in summer and winter, it is preferable that the face materials 4 exist on both sides like the heat insulation material 1 in Embodiment 1 of the present invention because the effect is greater. Also, it is preferable that the face materials 4 exist on both sides because it eliminates the possibility that the constructor may lay the heat insulation material on the roof side and the indoor side incorrectly when laying the heat insulation material. However, since the effect of the radiant heat reflecting layer 41 described later is significantly greater on the outdoor side, for the face material 4' on the indoor side, for example, it is also possible to omit the anti-slip layer or change the material from an economic point of view.

[0015] <Radiant heat reflecting layer> As the radiant heat reflecting layer 41, any material can be used as long as its emissivity is lower than that of the surface of general building members and the effects of radiant heat shielding and / or dew condensation prevention can be expected. Here, the emissivity is a value indicating the degree of thermal radiation (radiant heat) emitted by a substance, and the lower the emissivity value, the better the heat insulation property. Metals are materials with low emissivity due to heat reflection. Therefore, examples of the radiant heat reflecting layer 41 include a single metal foil, a composite of paper or a plastic film and a metal foil, and a composite of paper or a plastic film and a metal vapor deposition product. The metal foil only needs to be rust-resistant and is not particularly limited. For example, aluminum foil, copper foil, iron foil, lead foil, nickel foil, chromium foil, and alloy foils thereof can be mentioned. Aluminum foil is preferable because it is lightweight. Examples of paper include kraft paper, liner paper, calcium carbonate paper, glass paper, and paper-like nonwoven fabrics. Examples of plastic films include polyethylene film, polypropylene film, polyester film such as polyethylene terephthalate film, and polyvinyl chloride film.

[0016] <Anti-slip layer> The anti-slip layer 42 contains an anti-slip agent 6 and a synthetic resin 8, and is formed by kneading the anti-slip agent 6 and the synthetic resin 8 together. The anti-slip layer 42 can be used without any problems as long as it can be laminated without hindering the radiant heat shielding effect and / or condensation prevention effect of the radiant heat reflective layer 41, and can provide anti-slip properties. In order not to hinder the radiant heat shielding effect and / or condensation prevention effect, it is preferable to use a synthetic resin 8 made of a material with high light transmittance, and it is preferable that the emissivity is 0.6 or less when the anti-slip layer 42 is laminated on the radiant heat reflective layer 41.

[0017] <Anti-slip agent> The anti-slip agent 6 contained in the anti-slip layer 42 can be made of various materials and shapes, as long as it can exhibit anti-slip performance. Examples of such anti-slip agents 6 include inorganic particles such as sand, silica sand, silicon dioxide particles, silicon carbide particles, ceramic particles, glass particles, aluminum oxide particles, and metal particles. Examples of organic particles include hard synthetic resin chips, wood chips, and cork chips.

[0018] The average particle size of the anti-slip agent 6 is 1 mm or less, preferably 0.3 mm or less. Among the above particles, silica sand grades 5 to 9 (average particle size 1 mm or less) is preferred. Note that only one type of anti-slip agent 6 may be used, or two or more types may be used in combination (mixed).

[0019] <Synthetic resin> The heat insulating material 1 of Embodiment 1 uses a synthetic resin adhesive material (a synthetic resin 8 dissolved in a solvent) to fix the anti-slip agent 6. The anti-slip agent 6 is kneaded into the synthetic resin adhesive material and applied to the surface of the radiant heat reflective layer 41 to fix the anti-slip agent 8 to the surface of the radiant heat reflective layer 41. Various application methods such as roll coating, gravure coating, flexo coating, and spray coating can be used as the application method. The composition of the synthetic resin adhesive material is selected considering adhesion to the surface of the radiant heat reflective layer 41, and the mixing ratio with the solvent is determined so that a part of the outline of the anti-slip agent 6 appears on the surface of the radiant heat reflective layer 41 after the solvent evaporates. Examples of synthetic resins 8 used in the synthetic resin adhesive material include, but are not limited to, vinyl acetate resin, acrylic resin, polyurethane resin, epoxy resin, phenolic resin, and urea resin. Furthermore, in order to improve the adhesion of the synthetic resin adhesive material to the surface of the radiant heat reflective layer 41, various treatments (for example, corona discharge treatment, electron beam irradiation treatment, ultraviolet irradiation treatment, chemical reaction treatment, primer treatment, etc.) can be applied to the surface of the radiant heat reflective layer 41 as needed.

[0020] The anti-slip layer 42 contains wood powder in addition to the anti-slip agent 6 and synthetic resin 8, to the extent that it does not impair the effects of the present invention. The product may contain, as needed, organic materials such as clay and layered silicates, inorganic materials such as hydrolysis inhibitors, antibacterial agents, antifungal agents, viscosity modifiers, plasticizers, colorants such as titanium dioxide, fillers, and antistatic agents.

[0021] <Static friction coefficient and kinetic friction coefficient> In the first embodiment, the thermal insulation material 1 has facing materials 4 and 4' laminated on both sides of a core material 2, the static friction coefficient between the anti-slip layer 42 of the facing material 4 and the ordinary plywood is 0.49 or more and the dispersion V is 0.002 or less, and the dynamic friction coefficient between the anti-slip layer 42 of the facing material 4 and the ordinary plywood is 0.49 or more and the dispersion V is 0.001 or less.

[0022] In this invention, the static and dynamic friction coefficients of the heat insulating material 1 are determined by measuring the friction coefficient of the anti-slip layer 42, which is the outermost layer of the surface material 4, in accordance with JIS K 7125. Specifically, a standard plywood is fixed as a mating material on a standard test plate (table), and a surface material 4 of a predetermined size is placed on the standard plywood with the anti-slip layer 42 facing downwards. With a sliding piece placed on the surface material 4, the surface material 4 is pulled while applying a normal force (uniform pressure distribution), and the maximum load and the average load from the start of relative shear motion between the contact surfaces up to 60 mm are measured, and the static and dynamic friction coefficients are determined using the following calculation formulas (1) and (2).

[0023]

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[0024]

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[0025] The static friction coefficient of the surface material 4 is 0.49 or higher, preferably 0.60 or higher, and more preferably 0.63 or higher. The coefficient of dynamic friction of the surface material 4 is 0.49 or higher, preferably 0.54 or higher, and more preferably 0.59 or higher.

[0026] <Dispersion V> The variation in the friction coefficient of the anti-slip layer 42 is represented by the variance V. The variance V can be calculated using the following formulas (3) and (4). The difference between the measured values ​​of n friction coefficients and the mean value of the friction coefficients is calculated, and this difference is squared. Then, the sum of the values ​​obtained by squaring is divided by (n-1), and the resulting value (unbiased variance) is taken as the variance V.

[0027]

number

[0028]

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[0029] A smaller value of dispersion V indicates less variation. Therefore, by measuring the coefficient of friction at multiple points on the surface material 4 and calculating the dispersion V, it is possible to indicate whether the unevenness of the coating is suppressed.

[0030] The dispersion V of the static friction coefficient is 0.002 or less, for example, 0.0015 or less, for example, 0.001 or less. The variance V of the coefficient of kinetic friction is 0.001 or less, for example, 0.00075 or less, for example, 0.0005 or less.

[0031] Since the dispersion V of the static friction coefficient is 0.002 or less and the dispersion V of the dynamic friction coefficient is 0.001 or less, the anti-slip agent 6 is evenly distributed across the entire surface material 4 of the thermal insulation material 1. Therefore, the thermal insulation material equipped with this surface material 4 can be suitably used, for example, in areas with slopes. [Examples]

[0032] The following describes embodiments of the present invention in more detail, but the present invention is not limited to these, and various applications are possible without departing from the technical spirit of the present invention. The thermal insulation material 1 of Example 1 and the thermal insulation material of Comparative Example 1 have the shape shown in Figure 1, with a length of 1820 mm, a width of 910 mm, and a thickness of 45 mm.

[0033] [Example 1] The thermal insulation material 1 of Example 1 has a core material 2 made of polyurethane foam, and facing materials 4 and 4' are laminated on both sides of the core material 2. The facing material 4 is a laminated facing material consisting of a radiant heat reflective layer 41 and an anti-slip layer 42, and the radiant heat reflective layer 41 is laminated in the order of polyethylene film / aluminum foil / polyethylene film / kraft paper / polyethylene film / aluminum foil / polyethylene film from the core material 2 side. The facing material 4' consists of the radiant heat reflective layer 41, and the anti-slip layer 42 is omitted from the facing material 4. The anti-slip layer 42 is provided outside the radiant heat reflective layer 41 and is located on the outermost surface of the thermal insulation material 1. The anti-slip layer 42 is formed by kneading an anti-slip agent 6 into a synthetic resin adhesive material and applying this to the surface of the radiant heat reflective layer 41. The anti-slip agent 6 consists of silica sand with an average particle size of 1 mm or less, and the synthetic resin adhesive material (anti-slip varnish) consists of a synthetic resin 8 made of a mixed resin of urethane resin and isocyanate resin (30% by mass) and a mixed solvent of dimethylformamide, toluene and methyl ethyl ketone (70% by mass). Figure 4(a) shows a photograph of the surface condition of the heat insulating material 1 of Example 1. Furthermore, Figure 5(a) shows a photograph taken at 10 times magnification.

[0034] [Comparative Example 1] The thermal insulation material of Comparative Example 1 has a core material 2 made of polyurethane foam, and facing materials 4 and 4' are laminated on both sides of the core material 2. The facing material 4 is a laminated facing material consisting of a radiant heat reflective layer 41 and an anti-slip layer 42, and the radiant heat reflective layer 41 is laminated in the order of polyethylene film / aluminum foil / polyethylene film / kraft paper / polyethylene film / aluminum foil / polyethylene film from the core material 2 side. The facing material 4' consists of the radiant heat reflective layer 41, and the anti-slip layer 42 is omitted from the facing material 4. The anti-slip layer 42 is provided outside the radiant heat reflective layer 41 and is located on the outermost surface of the thermal insulation material. The anti-slip layer 42 is formed by kneading an anti-slip agent 6 into a synthetic resin adhesive material and applying this to the surface of the radiant heat reflective layer 41. The aforementioned anti-slip agent 6 consists of silica sand with an average particle size greater than 1.0 mm and less than or equal to 1.5 mm, and the synthetic resin adhesive material (anti-slip varnish) consists of a synthetic resin 8 made of a mixed resin (30% by mass) of urethane resin and isocyanate resin, dimethylformamide and toluene. It consists of a mixed solvent (70% by mass) of methyl ethyl ketone. Figure 4(b) shows a photograph of the surface condition of the thermal insulation material of Comparative Example 1. Furthermore, Figure 5(b) shows a photograph taken at 10 times magnification.

[0035] (Slip resistance evaluation: shoe sole) Based on the "Technical Guidelines for Safety Shoes and Work Shoes TIIS-ST-0603" published by the Japan Industrial Safety Technology Association, the static and dynamic friction coefficients of the shoe soles were measured. Specifically, a vertical load (260N) was applied to tabi shoes (26cm) and light work shoes (26cm), which are assumed to be worn by workers during wooden house construction, from above the insulation material 1 of Example 1 and the insulation material of Comparative Example 1. The static and dynamic friction coefficients were measured when the insulation material, which served as the road surface, was slid horizontally at a speed of 12m / min. Six measurements were taken, and the average of the second to sixth measurements, excluding the first measurement, was calculated. The results are shown in Table 1.

[0036] (Slip resistance and coating unevenness evaluation: Standard plywood) (1) Measurement of static friction coefficient and kinetic friction coefficient The insulation material 1 from Example 1 and the facing material 4 from Comparative Example 1 were each cut into 10 pieces measuring 80 mm in width and 100 mm in length. These facing materials 4 were placed on a 6 mm thick ordinary plywood (equivalent to the Japanese Agricultural Standard for Plywood: JAS Class 2, Grade 1) with the anti-slip layer 42 facing downwards. A sliding piece was placed on the facing material 4, and the static and dynamic friction coefficients of the anti-slip layer 42, which is the outermost layer, were measured in accordance with JIS K 7125. The contact area of ​​the sliding piece was 63 mm x 63 mm, the total mass of the sliding piece was 200 g (1.96 N), felt was attached to the contact surface of the sliding piece with the facing material, and the facing material 4 was pulled at a sliding speed of 100 mm / min for the measurement. At this time, the grain direction of the ordinary plywood and the pulling direction were aligned. The static and dynamic friction coefficients were calculated using the following formulas (1) and (2), and the average values ​​of each result are shown in Table 1.

[0037]

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[0038]

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[0039] (2) Calculation of Variance V The dispersion V was calculated using the static and kinetic friction coefficients obtained from the above results, using the following formulas (3) and (4). The results are shown in Table 1.

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[0040]

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[0041] (Heat shielding performance evaluation) The facing material 4 of the insulation material 1 of Example 1 and the facing material 4 of the insulation material of Comparative Example 1 were placed on a mold temperature controller and heated while in close contact with a weight (mold setting temperature: 50°C). The temperature near the measurement area was then measured using a contact thermometer. The emissivity setting of a radiation thermometer (Horiba Ltd., IT-540S; measurement of φ30mm at a distance of 100mm) was adjusted so that it was approximately the same as the obtained measured temperature, and the emissivity was measured when the values ​​of both thermometers were the same. The distance between the surface of the facing material and the lens of the radiation thermometer was fixed at 100mm. The results are shown in Table 1.

[0042] [Table 1]

[0043] As shown in Table 1, the static and dynamic friction coefficients of insulation material 1 of Example 1 and insulation material 1 of Comparative Example 1 against the soles of tabi socks and light work shoes commonly worn by construction workers were found to be of similar value. However, the results showed that the static friction coefficient and the kinetic friction coefficient dispersion V of the surface material 4 of the thermal insulation material 1 of Example 1 were approximately 1 / 6 and 1 / 7 smaller, respectively, than those of the surface material 4 of the thermal insulation material 1 of Comparative Example 1. Therefore, it can be seen that the unevenness of the anti-slip agent 6 coating is more suppressed. This is also shown by the surface appearance in Figures 4(a) and 4(b). From Figure 4(a), it can be seen that the white anti-slip agent 6 in the thermal insulation material 1 of Example 1 is uniformly dispersed throughout the surface material 4, whereas in Figure 4(b), there are dense areas where the white anti-slip agent 6 is densely distributed and sparse areas that appear black because the anti-slip agent 6 is absent, indicating that the unevenness of the anti-slip agent 6 coating is present throughout the surface material 4. Furthermore, the thermal insulation material 1 of Example 1 and the comparative example When the areas coated with the anti-slip agent 6 in Comparative Example 1's insulation material are magnified 10 times, it can be seen that the anti-slip agent 6 is uniformly dispersed even locally in the insulation material 1 of Example 1 in Figure 5(a), whereas in the insulation material of Comparative Example 1 in Figure 5(b), it was found that the unevenness of the coating of the anti-slip agent 6 is also localized. Furthermore, regarding heat shielding properties, the emissivity of typical building materials is around 0.8 to 0.95. Although both Example 1 and Comparative Example 1 showed low emissivity values, the insulation material 1 of Example 1 had a lower emissivity value than the insulation material of Comparative Example 1, indicating superiority from the perspective of heat shielding properties. Therefore, the results showed that insulation material 1 of Example 1 had less unevenness in the anti-slip coating, exhibiting superior anti-slip properties as well as superior heat shielding properties. Thus, it was found that it can be suitably used as insulation material for roofs and the like. [Explanation of Symbols]

[0044] 1. Insulation 2 Core material 4-sided material 4' Surface material (indoor side) 41 Radiant heat reflective layer 42 Anti-slip layer 6. Anti-slip agent 8 Synthetic resin 91 kenka 92 Lower rafter 94 Upper rafter 95 Field board 96 Waterproof paper 97 Waterproof Tape

Claims

1. An insulating material comprising a core material made of synthetic resin foam with a facing material laminated on at least one side thereof, wherein the facing material is a laminated facing material having at least a radiant heat reflective layer and an anti-slip layer. The anti-slip layer is provided outside the radiant heat reflective layer and located on the outermost surface of the heat insulating material. The anti-slip layer comprises an anti-slip agent with an average particle diameter of 1 mm or less and a synthetic resin. The static friction coefficient between the anti-slip layer of the aforementioned surface material and the ordinary plywood is 0.49 or higher, and the dispersion V is 0.002 or lower. The coefficient of dynamic friction between the anti-slip layer of the aforementioned surface material and the ordinary plywood is 0.49 or higher, and the dispersion V is 0.001 or lower. The thermal insulation material is characterized in that the radiant heat reflective layer is at least one selected from the group consisting of a metal foil alone, a composite product of paper or plastic film and metal foil, and a composite product of paper or plastic film and metal vapor deposition.

2. A thermal insulation material comprising a core material made of synthetic resin foam and a surface material laminated on both sides thereof, The aforementioned surface material is a laminated surface material in which one surface material has at least a radiant heat reflective layer and an anti-slip layer, and the other surface material has at least a radiant heat reflective layer but does not have an anti-slip layer. The anti-slip layer is provided outside the radiant heat reflective layer and located on the outermost surface of the heat insulating material. The anti-slip layer comprises an anti-slip agent with an average particle diameter of 1 mm or less and a synthetic resin. The static friction coefficient between the anti-slip layer of the aforementioned surface material and the ordinary plywood is 0.49 or higher, and the dispersion V is 0.002 or lower. The coefficient of dynamic friction between the anti-slip layer of the aforementioned surface material and the ordinary plywood is 0.49 or higher, and the dispersion V is 0.001 or lower. The thermal insulation material is characterized in that the radiant heat reflective layer is at least one selected from the group consisting of a metal foil alone, a composite product of paper or plastic film and metal foil, and a composite product of paper or plastic film and metal vapor deposition.

3. The synthetic resin foam is characterized in that it is at least one selected from the group consisting of polyurethane foam, polyphenol foam, and polystyrene foam, or The insulating material described in item 2.

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