Protective sheet and protective garment

Abstract

To provide a protective sheet and protective garment that can suppress the effects of radiant heat from sunlight, thereby preventing an increase in the internal temperature of the protective garment.SOLUTION: A protective sheet consists of the inner side and the outer side, comprising a first rubber layer located on the inner side, a second rubber layer located on the outer side, and a reinforcing fabric laminated between the first rubber layer and the second rubber layer. Different types of rubber are used for the first rubber layer and the second rubber layer. An infrared reflective agent is contained in the second rubber layer or both the first and second rubber layers in an amount of 5 wt.% or more and 30 wt.% or less.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a protective sheet and protective clothing that protect the human body from toxic gases, liquids, and the like, and that can suppress an increase in surface temperature even when used under the hot sun, etc. [Background technology]

[0002] Technology relating to protective sheets that protect the human body from toxic gases, liquids, etc. is disclosed, for example, in Japanese Patent No. 5784812 (Patent Document 1). For such protective sheets, good gas permeability resistance and liquid protection resistance are required for the material surface, and technology relating to surface treatment of materials is disclosed, for example, in Japanese Patent Laid-Open No. 2003-2903 (Patent Document 2) and Japanese Patent Laid-Open No. 2010-24279 (Patent Document 3). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5784812 [Patent Document 2] JP 2003-2903 A [Patent Document 3] JP 2010-24279 A Summary of the Invention [Problem to be solved by the invention]

[0004] Since protective clothing using protective sheets covers the whole body, when used outdoors, the inside of the protective clothing becomes hot due to the effect of radiant heat from sunlight. This makes it difficult to wear the protective clothing for long periods of time, and as a result, the work efficiency of the work performed while wearing the protective clothing decreases.

[0005] The present disclosure has an object to solve the above-mentioned problems and to provide a protective sheet and protective clothing that can suppress the rise in internal temperature of the protective clothing by suppressing the effects of radiant heat from solar radiation. [Means for solving the problem]

[0006] [1] The protective sheet of the present disclosure is a protective sheet having an inner side and an outer side, comprising a first rubber layer located on the inner side, a second rubber layer located on the outer side, and a reinforcing cloth laminated between the first rubber layer and the second rubber layer, wherein different types of rubber are used for the first rubber layer and the second rubber layer, and the second rubber layer contains an infrared reflective agent in an amount of 5 wt% or more and 30 wt% or less of the total solid content of the second rubber layer excluding the infrared reflective agent.

[0007] [2]: A protective sheet as described in [1], wherein the first rubber layer contains an infrared reflective agent in an amount of 5 wt% or more and 30 wt% or less of the total solid content of the first rubber layer excluding the infrared reflective agent.

[0008] [3]: The protective sheet according to [1] or [2], wherein one of the first rubber layer and the second rubber layer is made of acrylonitrile butadiene rubber, and the other is made of chlorobutyl rubber. [4]: The protective sheet according to [3], wherein the acrylonitrile butadiene rubber has an acrylonitrile content of 36 wt% or more.

[0009] [5]: The protective sheet according to any one of [1] to [4], wherein the infrared reflective agent is in particulate form, and the average particle size is 600 nm or more and 1500 nm or less.

[0010] [6]: The protective sheet according to any one of [1] to [5], wherein the infrared reflecting agent is a pigment containing one or more of the metallic elements titanium, manganese, calcium, iron, bismuth, chromium, and nickel.

[0011] [7]: The protective sheet according to any one of [1] to [6], wherein the reinforcing fabric is a woven fabric, a knitted fabric, or a nonwoven fabric.

[0012] [6] The protective clothing of the present disclosure uses the protective sheet described in any one of [1] to [7]. Effect of the Invention

[0013] According to the present disclosure, it is possible to provide a protective sheet and protective clothing that have the ability to inhibit the penetration of gaseous and liquid organic chemicals, and that can suppress the rise in internal temperature of the protective clothing by suppressing the effects of radiant heat from solar radiation. [Brief description of the drawings]

[0014] [Figure 1] FIG. 1 is a cross-sectional structural view of protective sheets 1A-1 to 1A-4 according to the first embodiment. [Diagram 2] FIG. 11 is a cross-sectional structural view of a protective sheet 1B according to a second embodiment. [Diagram 3] FIG. 11 is a cross-sectional structural diagram of a protective sheet 1C according to a third embodiment. [Figure 4] FIG. 11 is a cross-sectional structural diagram of a protective sheet 1D according to a fourth embodiment. [Diagram 5] FIG. 2 is a cross-sectional structural view of the protective sheet 2 of Comparative Example 1. [Figure 6] FIG. 2 is a cross-sectional structural view of the protective sheet 3 of Comparative Example 1. [Figure 7] FIG. 2 is a cross-sectional structural view of protective sheet 4 of Comparative Example 1. [Figure 8] FIG. 13 is a diagram showing the evaluation results of each protective sheet. [Figure 9] FIG. 2 is a schematic diagram showing a test vessel used in a gas permeability test. [Figure 10] FIG. 2 is a schematic diagram of a liquid permeability test method. [Figure 11] Schematic diagram of a surface temperature measurement method. [Figure 12] FIG. 13 is a front view showing the configuration of protective clothing according to a fifth embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] The protective sheet and protective clothing of each embodiment based on the present disclosure will be described below with reference to the drawings. In the embodiments described below, when numbers, amounts, etc. are mentioned, the scope of the present invention is not necessarily limited to those numbers, amounts, etc., unless otherwise specified. The same reference numbers are given to the same parts and corresponding parts, and duplicate descriptions may not be repeated. It is originally intended that the configurations in the embodiments be used in appropriate combination. For ease of understanding, the film thicknesses and layer thicknesses shown in the drawings are different from the actual ratios.

[0016] In the specification, "outer side" means the side that is exposed to toxic gases, liquids, etc. when the protective sheet is in use, and "inner side" means the side that is not exposed to toxic gases, liquids, etc. when the protective sheet is in use. Therefore, when this protective sheet is used in protective clothing, the side that comes into contact with the wearer is the "inner side".

[0017] [Embodiment 1: Protective Sheets 1A-1 to 1A-4] Protective sheets 1A-1 to 1A-4 of the present embodiment will be described with reference to Fig. 1. Fig. 1 is a cross-sectional structural view of protective sheets 1A-1 to 1A-4.

[0018] The protective sheets 1A-1 to 1A-4 of the present embodiment each have an inner side and an outer side, and each of the protective sheets 1A-1 to 1A-4 is made up of a first rubber layer 11 located on the inner side and a second rubber layer 13 located on the outer side. 3 and a reinforcing fabric 12 laminated therebetween.

[0019] Different rubbers are used for the first rubber layer 11 and the second rubber layer 13. In this embodiment, acrylonitrile butadiene rubber (NBR) is used for the first rubber layer 11, and chlorobutyl rubber is used for the second rubber layer 13. A nylon woven fabric with a thread thickness of 70 decitex is used for the reinforcing cloth 12. The thread thickness is not limited to this thickness. The material is also not limited to nylon. For example, polyester, cotton, etc. can also be used. In addition to woven fabric, knit, thin fabric, nonwoven fabric, etc. can also be used.

[0020] The first rubber layer 11 has a thickness of about 0.08 mm to 0.2 mm, the second rubber layer 13 has a thickness of about 0.08 mm to 0.2 mm, and the thickness is about 0.1 mm when a woven base fabric is used for the reinforcing fabric 12. When a knit fabric is used for the reinforcing fabric 12, the thickness of the reinforcing fabric 12 is about 0.2 mm to 0.3 mm.

[0021] Acrylonitrile butadiene rubber (NBR) is a synthetic rubber, a copolymer of acrylonitrile and 1,3-butadiene. Depending on the acrylonitrile content, They are classified as 24 wt% or less (low nitrile), 25-30 wt% (medium nitrile), 31-35 wt% (medium-high nitrile), 36-42 wt% (high nitrile), and 43 wt% or more (very high nitrile). The acrylonitrile butadiene rubber (NBR) of this embodiment is preferably high nitrile or higher, and more preferably very high nitrile. The protective sheets 1A-1 to 1A-4 of this embodiment use acrylonitrile butadiene rubber (NBR) classified as very high nitrile.

[0022] The second rubber layer 13 contains an infrared reflector. The infrared reflector means a material capable of reflecting light in the near infrared region (780 nm to 2500 nm) contained in natural light. For example, as the infrared reflector, a pigment containing one or more metal elements such as titanium, manganese, calcium, iron, bismuth, chromium, nickel, etc. can be used. In this embodiment, the content of the infrared reflector contained in the second rubber layer 13 is about 5 wt% to 30 wt% and preferably 15 to 20 wt% with respect to the solid content (100 wt%) excluding the infrared reflector among the total solid content of the second rubber layer 13. When an additive is contained in the first rubber layer 11, the additive is included in the solid content excluding the infrared reflector.

[0023] (Method of manufacturing protective sheets 1A-1 to 1A-4) The manufacturing method of chlorobutyl rubber or acrylonitrile butadiene rubber (NBR) used in the first rubber layer 11 and the second rubber layer 13 will be described. First, additives (vulcanizing agent, accelerator, reinforcing agent, softener, pigment, etc.) and infrared reflector are mixed into the raw rubber to obtain raw rubber mixed with infrared reflector. This raw rubber is kneaded, stretched, and formed into a sheet.

[0024] Next, a chlorobutyl rubber sheet mixed with an infrared reflecting agent is laminated on one side of the fabric (step 1), and then an NBR rubber sheet is laminated on the other side of the fabric (step 2). After that, this laminated sheet is heated and vulcanized (step 3). The order of steps 1 and 2 may be reversed.

[0025] As a result of the above, protective sheets 1A-1 to 1A-4 having a three-layer structure of first rubber layer 11, reinforcing fabric 12, and second rubber layer 13 are obtained.

[0026] The infrared reflecting agent is mixed in an amount of 5 wt% to 30 wt%, preferably 15 to 20 wt%, based on the total solid content of the first rubber layer 11 (raw rubber + additives) (100 wt%) excluding the infrared reflecting agent. A reflector ("SG-101" manufactured by Ishihara Sangyo Kaisha, Ltd.) can be used. In this embodiment, protective sheets 1A-1 to 1A-4 were produced using chlorobutyl rubber sheets containing 5, 15, 20, and 30 wt% of infrared reflector relative to the solid content (raw rubber + additives) (100 wt%) excluding the infrared reflector. [Embodiment 2: Protective sheet 1B] A protective sheet 1B of this embodiment will be described with reference to Fig. 2. Fig. 2 is a cross-sectional view of the protective sheet 1B.

[0027] In the protective sheet 1B of the present embodiment, the process for obtaining a three-layer structure of a first rubber layer 14, a reinforcing cloth 15, and a second rubber layer 16 is the same as that of the protective sheets 1A-1 to 1A-4 of the first embodiment, but the rubber types are reversed. That is, chlorobutyl rubber is used for the first rubber layer 14, and acrylonitrile butadiene rubber (NBR rubber) containing an infrared reflecting agent is used for the second rubber layer 16. The infrared reflecting agent is mixed in an amount of 15 wt% relative to the solid content (100 wt%) of the total solid content of the second rubber layer 16 excluding the infrared reflecting agent.

[0028] The first rubber layer 14 is made of chlorobutyl rubber, and the second rubber layer 16 is made of acrylonitrile butadiene rubber (NBR). The reinforcing cloth 15 is made of nylon woven fabric with a thread thickness of 70 decitex. The thread thickness is not limited to this thickness. The material is also not limited to nylon. For example, polyester, cotton, etc. can also be used. In addition to woven fabric, knits, thin fabrics, nonwoven fabrics, etc. can also be used.

[0029] The thickness of the first rubber layer 14 is about 0.08 mm to 0.2 mm, the thickness of the second rubber layer 16 is about 0.08 mm to 0.2 mm, and the thickness when a woven base fabric is used for the reinforcing cloth 15 is about 0.1 mm. When a knit fabric is used for the reinforcing cloth 15, the thickness of the reinforcing cloth 15 is about 0.2 mm to 0.3 mm. In this embodiment, the thickness of the first rubber layer, the thickness of the second rubber layer, and the material and thickness of the reinforcing cloth are the same as those in the first embodiment.

[0030] (Manufacturing method of protective sheet 1B) The method of manufacturing protective sheet 1B is the same as that of protective sheets 1A-1 to 1A-4 in embodiment 1, in that an NBR rubber sheet mixed with an infrared reflecting agent is laminated on one side of a fabric (step 1), and then a chlorobutyl rubber sheet is laminated on the other side of the fabric (step 2). This laminated sheet is then heated and vulcanized (step 3). The order of steps 1 and 2 may be reversed.

[0031] As a result of the above, a protective sheet 1B having a three-layer structure consisting of the first rubber layer 14, the reinforcing fabric 15, and the second rubber layer 16 is obtained. [Embodiment 2: Protective sheet 1C] A protective sheet 1C of this embodiment will be described with reference to Fig. 3. Fig. 3 is a cross-sectional view of the protective sheet 1C.

[0032] (Protective Sheet 1C) The process for obtaining the three-layer structure of first rubber layer 17, reinforcing cloth 18, and second rubber layer 19 for protective sheet 1C is the same as that for protective sheets 1A-1 to 1A-4 in embodiment 1, but both first rubber layer 17 and second rubber layer 19 contain an infrared reflecting agent in an amount of 15 wt % based on the total solid content of each layer excluding the infrared reflecting agent.

[0033] The first rubber layer 17 is made of chlorobutyl rubber, and the second rubber layer 19 is made of acrylonitrile butadiene rubber (NBR). The reinforcing fabric 18 is made of nylon fabric with a thread thickness of 70 decitex. The thread thickness is not limited to this thickness. The material is also not limited to nylon. For example, polyester, cotton, etc. can also be used. In addition to woven fabrics, knitted fabrics, thin woven fabrics, nonwoven fabrics, etc. can also be used.

[0034] The thickness of the first rubber layer 17 is about 0.08 mm to 0.2 mm, the thickness of the second rubber layer 19 is about 0.08 mm to 0.2 mm, and the thickness when a woven base fabric is used for the reinforcing cloth 18 is about 0.1 mm. When a knit fabric is used for the reinforcing cloth 18, the thickness of the reinforcing cloth 15 is about 0.2 mm to 0.3 mm. In this embodiment, the thickness of the first rubber layer, the thickness of the second rubber layer, and the material and thickness of the reinforcing cloth are the same as those in the first embodiment.

[0035] (Manufacturing method of protective sheet 1C) As with the protective sheet 1A of the first embodiment, an NBR rubber sheet mixed with an infrared reflector is laminated on one side of the reinforcing fabric 18 (step 1), and then a chlorobutyl rubber sheet mixed with an infrared reflector is laminated on the other side of the reinforcing fabric 18 (step 2). This laminated sheet is then heated and vulcanized (step 3). The order of steps 1 and 2 may be reversed.

[0036] As a result of the above, a protective sheet 1C having a three-layer structure consisting of the first rubber layer 17, the reinforcing fabric 18, and the second rubber layer 19 is obtained. [Embodiment 4: Protective sheet 1D] A protective sheet 1D of this embodiment will be described with reference to Fig. 4. Fig. 4 is a cross-sectional view of the protective sheet 1D.

[0037] (Protective Sheet 1D) Protective sheet 1D has the same three-layer structure of first rubber layer 21, reinforcing fabric 22, and second rubber layer 23 as protective sheets 1A-1 to 1A-4 of embodiment 1, but in addition to the three-layer structure, fabric 20 is laminated as the innermost layer.

[0038] The first rubber layer 21 is made of chlorobutyl rubber, and the second rubber layer 23 is made of acrylonitrile butadiene rubber (NBR). The reinforcing cloth 22 is made of nylon woven fabric with a thread thickness of 70 decitex. The thread thickness is not limited to this thickness. The material is also not limited to nylon. For example, polyester, cotton, etc. can also be used. In addition to woven fabric, knits, thin fabrics, nonwoven fabrics, etc. can also be used.

[0039] The thickness of the first rubber layer 21 is about 0.08 mm to 0.2 mm, the thickness of the second rubber layer 23 is about 0.08 mm to 0.2 mm, and the thickness when a woven base fabric is used for the reinforcing cloth 22 is about 0.1 mm. When a knit fabric is used for the reinforcing cloth 22, the thickness of the reinforcing cloth 22 is about 0.2 mm to 0.3 mm. In this embodiment, the thickness of the first rubber layer, the thickness of the second rubber layer, and the material and thickness of the reinforcing cloth are the same as those in the first embodiment.

[0040] (Manufacturing method of protective sheet 1D) A chlorobutyl rubber sheet mixed with an infrared reflector is laminated on one side of the reinforcing fabric 22 (step 1), and then an NBR rubber sheet is laminated on the other side of the reinforcing fabric 22 (step 2). After that, the fabric 20 is laminated on the NBR rubber sheet (step 3). This laminated sheet is then heated and vulcanized (step 4). The order of steps 1 and 2 may be reversed.

[0041] As a result of the above, a protective sheet 1D having a four-layer structure consisting of the fabric 20, the first rubber layer 21, the reinforcing fabric 22, and the second rubber layer 23 is obtained.

[0042] [Comparative Example 1: Protective Sheet 2] The protective sheet 2 of Comparative Example 1 will be described with reference to Fig. 5. Fig. 5 is a cross-sectional view of the protective sheet 2. (Protective Sheet 2) The protective sheet 2 of Comparative Example 1 has a three-layer structure consisting of a first rubber layer 24, a reinforcing cloth 25, and a second rubber layer 26. In the protective sheet 2, the second rubber layer 26 uses chlorobutyl rubber containing an infrared reflecting agent at a ratio of 15 wt% to the total solid content (100 wt%) of the second rubber layer 26 excluding the infrared reflecting agent. The first rubber layer 24 uses chlorobutyl rubber not containing an infrared reflecting agent.

[0043] Chlorobutyl rubber is used for the first rubber layer 24 and the second rubber layer 26. In Comparative Example 1, the thickness of the first rubber layer, the thickness of the second rubber layer, and the material and thickness of the reinforcing fabric were the same as those in the first embodiment.

[0044] (Method of manufacturing protective sheet 2) A chlorobutyl rubber sheet is laminated on one side of the reinforcing fabric 25 (Step 1), and then a chlorobutyl rubber sheet containing an infrared reflecting agent is laminated on the other side of the reinforcing fabric 25 (Step 2). After that, this laminated sheet is heated and vulcanized (Step 3).

[0045] As a result of the above, the protective sheet 2 having a three-layer structure of the first rubber layer 24, the reinforcing fabric 25, and the second rubber layer 26 is obtained.

[0046] [Comparative Example 2: Protective Sheet 3] The protective sheet 3 of Comparative Example 2 will be described with reference to Fig. 6. Fig. 6 is a cross-sectional view of the protective sheet 23. (Protective Sheet 3) The protective sheet 3 of Comparative Example 2 has a three-layer structure of a first rubber layer 27, a reinforcing fabric 28, and a second rubber layer 29. In the protective sheet 3, carbon black was blended into the second rubber layer 29 instead of an infrared reflecting agent at a ratio of 1.5 wt% relative to the total solid content of the second rubber layer 29 excluding the carbon black (100 wt%).

[0047] Chlorobutyl rubber is used for the first rubber layer 27, and acrylonitrile butadiene rubber (NBR) is used for the second rubber layer 29. In Comparative Example 2, the thickness of the first rubber layer, the thickness of the second rubber layer, and the material and thickness of the reinforcing cloth are the same as those in the first embodiment.

[0048] (Method of manufacturing protective sheet 2) A chlorobutyl rubber sheet containing carbon black is laminated on one side of the reinforcing fabric 28 (Step 1), and then an acrylonitrile butadiene (NBR) rubber sheet is laminated on the other side of the reinforcing fabric 28 (Step 2). After that, this laminated sheet is heated and vulcanized (Step 3).

[0049] As a result of the above, the protective sheet 3 having a three-layer structure of the first rubber layer 27, the reinforcing fabric 28, and the second rubber layer 29 is obtained.

[0050] [Comparative Example 3: Protective Sheet 4] The protective sheet 4 of Comparative Example 3 will be described with reference to Fig. 7. Fig. 7 is a cross-sectional view of the protective sheet 4. (Protective Sheet 4) The protective sheet 4 of Comparative Example 3 has a three-layer structure of a first rubber layer 30, a reinforcing fabric 31, and a second rubber layer 32. In the protective sheet 4, an infrared reflecting agent was blended into the second rubber layer 32 in an amount of 1 wt% relative to the total solid content of the second rubber layer 32 excluding the infrared reflecting agent (100 wt%).

[0051] The first rubber layer 30 is made of acrylonitrile butadiene rubber (NBR), and the second rubber layer Chlorobutyl rubber is used for the rubber layer 32. In the third comparative example, the thickness of the first rubber layer, the thickness of the second rubber layer, and the material and thickness of the reinforcing fabric were the same as those in the first embodiment.

[0052] (Method of manufacturing protective sheet 4) A chlorobutyl rubber sheet containing 1 wt% of an infrared reflector is laminated on one side of the reinforcing fabric 31 (Step 1), and then an acrylonitrile butadiene (NBR) rubber sheet is laminated on the other side of the reinforcing fabric 31 (Step 2). After that, this laminated sheet is heated and vulcanized (Step 3).

[0053] As a result of the above, the protective sheet 4 having a three-layer structure of the first rubber layer 30, the reinforcing fabric 31, and the second rubber layer 32 is obtained.

[0054] [Evaluation method] Next, a method for evaluating a protective sheet will be described with reference to Figures 9 to 11. Figure 9 is a schematic diagram showing a test vessel used in a gas permeability test, Figure 10 is a schematic diagram of a liquid permeability test method, and Figure 11 is a schematic diagram of a surface temperature measurement method.

[0055] The gas permeability resistance (6-hr maximum permeation concentration / ppm) was evaluated using a gas permeability test for 2-chloroethyl ethyl sulfide. Referring to FIG. 9, the gas permeability test was performed by sandwiching a test sample 104 of the embodiment between an upper cell (150 cc) 100 and a lower cell (150 cc) 101. A test liquid (2-chloroethyl ethyl sulfide) 103 was dropped onto the upper surface of the test sample 104. The upper cell (150 cc) 100 and the lower cell (150 cc) 101 sandwiching the test sample 104 were sealed with a paraffin seal 105. Thereafter, the gas in the lower cell was sampled from the sampling port 102, and the gas permeability was evaluated by gas chromatography. The evaluation criteria were as follows: ◎ if the 6-hr maximum permeation concentration of the lower cell was 30 ppm or less, ◯ if it was more than 30 ppm and less than 60 ppm, and × if it was 61 ppm or more.

[0056] 10, in the liquid permeability test method, a filter paper 111 is placed on a glass plate 110, and a test sample 112 of the embodiment is placed on top of the filter paper 111. 20 μL of a liquid chemical substance 113 (dipropyl phthalate with red dye dissolved therein) is then dropped on top of the filter paper 111. Then, a sample with a base area of ​​1 cm2 is placed on top of the filter paper 111. 2 The weight is applied with a specified load of 114 (1 kgf / cm 2 The filter paper was placed in a cool, dark place and the presence or absence of penetration of the liquid was judged by the color of the filter paper after 12 hours. The judgment criteria were: ◯ for no penetration, × for penetration.

[0057] For the evaluation of the solar radiation effect (surface temperature), a test device made with reference to JIS L 1951 (heat shielding test of fabric) was used. The fabric surface temperature was determined by reading it with a FLIR thermo camera. In the test device shown in FIG. 11, the environmental temperature was set to 20 degrees to 25 degrees, and a reflector lamp 120 (Iwasaki Electric PRS-500W) was used as the light source. The output of the reflector lamp 120 was 500 W. A spacer 124 having a thickness of 5 mm and a protective sheet sample 121 were placed on a test stand 121, and the distance between the protective sheet sample 121 and the reflector lamp was adjusted to 40 cm. For the fabric surface temperature, the surface temperature was measured for the protective sheet sample 121 15 minutes after the light irradiation at a position where the angle between the test stand 122-center of the protective sheet sample 121-thermal camera 123 was 45 degrees, and the distance between the protective sheet sample 121 and the thermal camera 123 was 60 cm. The evaluation criteria were as follows: if the surface temperature 15 minutes after light irradiation was 50°C or less, it was rated as ⊚; if it was between 50°C and 60°C, it was rated as ◯; and if it was 60°C or more, it was rated as x.

[0058] The solar radiation effect (solar reflectance) was evaluated using a spectrophotometer (Shimadzu Corporation, UV-VIS-NIR spectrophotometer SolidSpec-3700). The spectral reflectance at 300 nm was measured, and judged in the near ultraviolet-visible light range (300-780 nm) and near infrared range (780-2500 nm) based on JIS K 5602:2008 (Solar reflectance of coating film). The judgment criteria were as follows: if the solar reflectance in the near ultraviolet-visible light range was less than 15%, it was marked as ◯, and if it was 15% or more, it was marked as ×. In addition, if the solar reflectance in the near infrared range was 40% or more, it was marked as ◯, and if it was less than 40%, it was marked as ×.

[0059] [Evaluation Results] Next, the evaluation results will be described with reference to Fig. 8. Fig. 8 is a diagram showing the configuration of the protective sheet produced above and the evaluation results.

[0060] In the protective sheets 1A-1 to 1A-4 of embodiment 1, the 6-hr maximum penetration concentration in the lower cell was 60 ppm or less, no penetration was observed in the liquid penetration test, and the solar radiation effect (surface temperature) was less than 60°C. When 15% or more of infrared reflecting agent was blended into the second rubber layer, the temperature was 50°C or less, and excellent results were obtained.

[0061] Thus, it can be seen that protective sheets 1A-1 to 1A-4 of embodiment 1 have better gas permeability resistance and liquid resistance than the comparative examples, and can suppress surface temperature rise by the infrared reflection effect. As a result, it is possible to suppress the penetration of harmful gases, liquids, etc. into the inside of protective materials 1A-1 to 1A-4, suggesting that the effects of solar radiation can be minimized even if harmful gases, liquids, etc. come into contact with the outside of protective sheet 1A.

[0062] In the protective sheet 1B of embodiment 2, the 6-hr maximum permeation concentration in the lower cell was 60 ppm or less, no permeation was observed in the liquid permeability test, and excellent results were obtained with respect to the solar radiation effect (surface temperature) of 60° C. or less.

[0063] Thus, it can be seen that the protective sheet 1B of embodiment 2 can also suppress the rise in surface temperature by reflective infrared rays, similar to the protective sheets 1A-1 to 1A-4 of embodiment 1. As a result, it is suggested that the effect of sunlight on the inside of protective sheet 1B can be minimized.

[0064] In the protective sheet 1C of embodiment 3, the 6-hr maximum permeation concentration in the lower cell was 60 ppm or less, no permeation was observed in the liquid permeability test, and excellent results were obtained with respect to the solar radiation effect (surface temperature) of 60° C. or less.

[0065] Thus, it can be seen that the protective sheet 1C of embodiment 3 can also suppress the rise in surface temperature by reflective infrared rays, similar to the protective sheets 1A-1 to 1A-4 of embodiment 1. As a result, it is suggested that the effect of sunlight on the inside of the protective sheet 1C can be minimized.

[0066] In the protective sheet 1D of embodiment 4, the 6-hr maximum permeation concentration in the lower cell was 60 ppm or less, no permeation was observed in the liquid permeability test, and excellent results were obtained with respect to the solar radiation effect (surface temperature) of 60°C or less.

[0067] Thus, it can be seen that the protective sheet 1D of embodiment 4 can also suppress the rise in surface temperature by reflective infrared rays, similar to the protective sheets 1A-1 to 1A-4 of embodiment 1. As a result, it is suggested that the effect of sunlight on the inside of the protective sheet 1D can be minimized.

[0068] In the protective sheet of Comparative Example 1, the first and second rubber layers are made of the same chlorobutyl rubber, so in the evaluation of protective properties, the maximum 6-hour penetration concentration of the lower cell was 80 ppm. In the liquid permeability test, permeation was observed, and the sheet was found to be unsuitable as a protective sheet.

[0069] The protective sheet of Comparative Example 2 contained 1.5 wt% carbon black, which absorbs light in the near-infrared range, rather than an infrared reflector. As a result, the surface temperature rose to 65°C and the solar reflectance in the near-infrared range was 6.5%, making it unsuitable as a protective sheet.

[0070] In the protective sheet of Comparative Example 3, although the surface temperature was low at 43°C, the amount of infrared reflective agent was only 1 wt%, which affected the natural color of the rubber and resulted in a solar reflectance of over 15% in the near ultraviolet and visible light range, making it unsuitable as a protective sheet.

[0071] [Embodiment 5: Protective clothing 150] The configuration of protective clothing 150 in this embodiment will be described with reference to Fig. 10. Fig. 10 is a front view showing the configuration of protective clothing 150. This protective clothing 150 is manufactured using protective sheets 1A-1 to 1A-4, protective sheet 1B, protective sheet C, or protective sheet 1D described in each of the above embodiments.

[0072] As an example, when using protective sheet 1A-2, a specific method of manufacturing the protective sheet of this protective clothing 150 is to first laminate a chlorobutyl rubber sheet mixed with an infrared reflecting agent on one side of the fabric (step 1). Next, an NBR rubber sheet is laminated on the other side of the fabric (step 2). Next, heat vulcanization is performed (step 3). Note that the order of steps 1 and 2 may be reversed.

[0073] Protective clothing 150 manufactured using protective sheets 1A-1 to 1A-4, 1B, C, or 1D can prevent harmful gases, liquids, etc. from passing through protective clothing 150 even if the surface (outside) comes into contact with harmful gases, liquids, etc., and can reliably protect the wearer. In addition, even when used in a solar radiation environment, the surface temperature rise is small, and this can contribute to measures against heat stress for the wearer. This leads to increased work efficiency for the wearer.

[0074] Although protective clothing 150 has been given as an example of protective clothing having a jacket, pants, and a hood, the protective sheet of the present disclosure can be widely applied to clothing worn when entering or exiting an area contaminated by harmful gases, liquids, etc.

[0075] Although the above shows an example in which the protective sheet is applied to protective clothing, the protective sheet of the present invention can also be applied to other items, such as protective gloves, protective socks, protective hoods, protective covers, filters, protective tents, sleeping bags, and storage bags for storing these items. It can also be used as a sealing material such as packing and gaskets for protective containers and devices.

[0076] The embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present invention is defined by the claims, not the above description, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0077] 1A-1~1A-4,1B,1C,1D,2,3,4 Protective sheet 11,14,17,21,24,27,30 First rubber layer 13,16,19,23,26,29,32 Second rubber layer 12,15,18,22,25,28,31 Reinforcement fabric 20 Fabric

Claims

1. A protective sheet having an inner side and an outer side, a first rubber layer located on an inner side, a second rubber layer located on an outer side, and a reinforcing fabric laminated and disposed between the first rubber layer and the second rubber layer, Different types of rubber are used in the first rubber layer and the second rubber layer, The second rubber layer contains an infrared reflecting agent in an amount of 5 wt % or more and 30 wt % or less based on the total solid content of the second rubber layer excluding the infrared reflecting agent.

2. 2. The protective sheet according to claim 1, wherein the first rubber layer contains an infrared reflective agent in an amount of 5 wt % to 30 wt % based on the total solid content of the first rubber layer excluding the infrared reflective agent.

3. 2. The protective sheet according to claim 1, wherein one of the first rubber layer and the second rubber layer is made of acrylonitrile butadiene rubber, and the other is made of chlorobutyl rubber.

4. 4. The protective sheet according to claim 3, wherein the acrylonitrile butadiene rubber has an acrylonitrile content of 36 wt % or more.

5. 2. The protective sheet according to claim 1, wherein the infrared reflective agent is in particulate form and has a particle diameter of 500 nm or more and 1500 nm or less.

6. 2. The protective sheet according to claim 1, wherein the infrared reflective particles are pigments containing at least one of the metallic elements titanium, manganese, calcium, iron, bismuth, chromium, and nickel.

7. The protective sheet according to claim 1 , wherein the reinforcing fabric is a woven fabric, a knitted fabric, or a nonwoven fabric.

8. A protective garment using the protective sheet according to any one of claims 1 to 7.

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