Thermal insulation material and preparation method and application thereof

Abstract

The invention provides a thermal insulation material as well as a preparation method and application thereof. The invention belongs to the technical field of functional materials, and discloses a thermal insulation material which is composed of one or more organic fibers. The bonding surface of the organic fiber contains dots. Through a dot bonding mode, the fiber surface is in point contact, the bonding area is small, the heat conductivity coefficient of the heat insulation material can be reduced, and the heat preservation capacity is remarkably improved. The invention also provides a preparation method of the thermal insulation material, and a thermal insulation core material, a thermal insulation plate and a temperature adjusting device which comprise the thermal insulation material.

Description

Technical Field

[0001] The invention belongs to the technical field of functional materials, and in particular relates to a thermal insulation material and a preparation method and application thereof. Background Art

[0002] Vacuum insulation panels are a new type of insulation material that has developed rapidly in recent years. They use the high vacuum inside to reduce air heat convection, the low thermal conductivity core material reduces solid heat conduction, and the high reflective barrier film increases the inhibitory effect on radiation convection. At the same time, it plays the role of water and air isolation to maintain the vacuum degree, so that the internal heat transfer is reduced to a minimum. There are vacuum insulation panels on the market with glass fiber or aerogel as the core material. However, these vacuum insulation panels with inorganic materials as the core material have the problems of relatively high prices, dust pollution during the production process, difficulty in recycling glass fiber after the product is discarded, and irritation to people. Therefore, there are products on the market that use organic fibers to replace glass fibers to solve the problems of existing glass fiber core materials and obtain better thermal insulation effects. However, in order to ensure manufacturability and improve fiber strength, the existing organic fibers will be pressed with plain rollers / polished steel rollers before the fibers are rolled up, resulting in all the fibers being hot-melted together to form more connection points. Although the existence of connection points will increase the mechanical strength of the fibers, it will increase the solid-phase heat transfer between the fibers to a certain extent. Therefore, when making the core material of the vacuum insulation panel, the thermal insulation capacity is poor.

[0003] Therefore, it is necessary to develop an insulating material with low thermal conductivity and high thermal insulation capacity. Summary of the invention

[0004] The present invention aims to solve one of the above technical problems existing in the prior art. To this end, one of the purposes of the present invention is to provide a thermal insulation material, which has the advantages of low thermal conductivity and high heat preservation capacity.

[0005] A second object of the present invention is to provide a method for preparing the above-mentioned thermal insulation material.

[0006] A third object of the present invention is to provide a thermal insulation core material comprising the above-mentioned thermal insulation material.

[0007] A fourth object of the present invention is to provide an insulating board material comprising the above-mentioned insulating core material.

[0008] A fifth object of the present invention is to provide a method for preparing the above-mentioned thermal insulation board.

[0009] A sixth object of the present invention is to provide a temperature regulating device.

[0010] In order to achieve the above object, the technical solution adopted by the present invention is:

[0011] A first aspect of the present invention provides a thermal insulation material, which is composed of a plurality of thermal insulation single layers stacked together, wherein the thermal insulation single layers are composed of one or more organic fibers, and the organic fibers are connected by dot pattern bonding.

[0012] The thermal insulation material according to the first aspect of the present invention has at least the following beneficial effects:

[0013] The organic fibers are connected by dot bonding, and the dot patterns are formed by dot rolling in the hot rolling process. The present invention uses the dot bonding method between the organic fibers to make the connection surfaces between the fibers point contact, and the bonding area is small, which reduces the thermal conductivity of the insulation material and significantly improves the thermal insulation capacity.

[0014] In some embodiments of the thermal insulation material of the present invention, the number of stacked layers is 50 to 1000.

[0015] In some embodiments of the thermal insulation material of the present invention, the organic fiber includes one or more of polyester fiber, polypropylene fiber, polyethylene fiber, polystyrene fiber, butadiene fiber, and styrene fiber.

[0016] In some embodiments of the thermal insulation material of the present invention, the diameter of the organic fiber is 4 to 30 μm.

[0017] In some specific embodiments of the thermal insulation material of the present invention, the diameter of the organic fiber is 5 to 28 μm.

[0018] In some embodiments of the thermal insulation material of the present invention, the weight of the organic fiber is 10 to 40 g / m 2 .

[0019] In some specific embodiments of the thermal insulation material of the present invention, the weight of the organic fiber is 10 to 30 g / m 2 .

[0020] In some embodiments of the thermal insulation material of the present invention, the cross-sectional shape of the organic fiber includes one or more of a circular shape, a triangular shape, a clover shape, an elliptical shape, a T shape, and a Y shape.

[0021] The second aspect of the present invention provides a method for preparing the thermal insulation material described in the first aspect of the present invention, comprising the following steps: point-rolling one or more organic fibers to form a thermal insulation single layer, and stacking the thermal insulation single layers to obtain the thermal insulation material.

[0022] The thermal insulation material according to the second aspect of the present invention has at least the following beneficial effects:

[0023] By adopting the hot rolling process of point rolling, the surface of the organic fiber is in a point-bonded state, which ensures that the fiber has a certain fiber strength when rolled and reduces the solid-phase heat transfer between the fibers, thereby significantly improving the thermal insulation capacity of the insulation material.

[0024] In some embodiments of the thermal insulation material of the present invention, the device for point rolling is a spunbond fiber hot calender roller.

[0025] In some embodiments of the thermal insulation material of the present invention, in the point rolling, the density of the rolling points is 15% to 25%.

[0026] In some embodiments of the thermal insulation material of the present invention, in the point rolling, the spacing between the rolling points is (1 mm to 3 mm)×(1 mm to 3 mm).

[0027] The third aspect of the present invention provides a thermal insulation core material, comprising the thermal insulation material described in the first aspect of the present invention.

[0028] The thermal insulation core material according to the third aspect of the present invention has at least the following beneficial effects:

[0029] The heat insulating core material of the present invention has low thermal conductivity and good heat preservation effect.

[0030] A fourth aspect of the present invention provides a thermal insulation board, comprising:

[0031] The thermal insulation core material described in the third aspect of the present invention comprises a barrier film; the barrier film covers the thermal insulation core material.

[0032] The thermal insulation board according to the fourth aspect of the present invention has at least the following beneficial effects:

[0033] The heat insulating board material of the present invention has low thermal conductivity and high heat preservation effect.

[0034] In some embodiments of the thermal insulation board of the present invention, the barrier film includes one or more of a double-sided aluminum-plated film, a cation-cation film, and a double-sided aluminum-free film.

[0035] The fifth aspect of the present invention provides a method for preparing the thermal insulation board material according to the fourth aspect of the present invention, comprising the following steps: placing the thermal insulation core material into a barrier film, performing vacuum packaging, and obtaining the thermal insulation board material.

[0036] The method for preparing the thermal insulation board according to the fifth aspect of the present invention has at least the following beneficial effects:

[0037] The preparation method of the thermal insulation board of the present invention is simple and easy to operate.

[0038] In some embodiments of the method for preparing the thermal insulation board of the present invention, the vacuum degree of the vacuum packaging is 0.0001-1Pa.

[0039] In some embodiments of the method for preparing the thermal insulation board material of the present invention, the vacuuming time of the vacuum packaging is 10 to 120 minutes.

[0040] The sixth aspect of the present invention provides a temperature regulating device, which comprises one or more of the insulation material described in the first aspect of the present invention, the insulation core material described in the third aspect of the present invention, and the insulation board material described in the fourth aspect of the present invention.

[0041] The temperature regulating device according to the sixth aspect of the present invention has at least the following beneficial effects:

[0042] The temperature regulating device provided by the present invention comprises a heat-insulating material, a heat-insulating core material or a heat-insulating plate material. These materials have a lower thermal conductivity and a better heat-insulating effect, and thus have a good temperature regulating effect.

[0043] In some embodiments of the temperature regulating device of the present invention, the temperature regulating device includes one or more of a refrigeration device, a building insulation device, and a liquefied natural gas transportation device.

[0044] In some embodiments of the temperature regulating device of the present invention, the refrigeration device includes one or more of a refrigerator, a freezer, a cold storage, and an air conditioner. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 This is a SEM image of the thermal insulation material of Example 1 of the present invention.

[0046] Figure 2 It is a SEM picture of the thermal insulation material of comparative example 1 of the present invention. DETAILED DESCRIPTION

[0047] Embodiments of the present invention are described in detail below. The embodiments are exemplary and are only used to explain the present invention, but are not to be construed as limiting the present invention.

[0048] The first aspect of the present invention provides a thermal insulation material, which is composed of a plurality of thermal insulation single layers stacked together, wherein the thermal insulation single layers are composed of one or more organic fibers, and the organic fibers are connected by dot bonding. The organic fibers are connected by dot bonding, and the dot pattern is formed by dot rolling in a hot rolling process. The present invention uses the bonding method of the dot pattern between the organic fibers to make the connection surface between the fibers point contact, and the bonding area is small, thereby reducing the thermal conductivity of the thermal insulation material and significantly improving the thermal insulation capacity.

[0049] In some embodiments of the present invention, the number of stacked layers is 100 to 1000 layers; in some specific embodiments of the present invention, the number of stacked layers is 120 to 600 layers; in some examples of the present invention, the number of stacked layers is 150 to 300 layers. In some specific examples, the number of stacked layers can be selected from 160 layers, 170 layers, 180 layers, 190 layers, 200 layers, 220 layers or 250 layers.

[0050] In some embodiments of the present invention, the organic fiber includes one or more of polyester fiber, polypropylene fiber, polyethylene fiber, polystyrene fiber, butadiene fiber, and styrene fiber.

[0051] Polyester fiber is a synthetic fiber made of polyester polymer materials. It has good strength and wear resistance, and has excellent wrinkle resistance and shrinkage resistance. Polyester fiber also has good chemical and heat resistance, is easy to dye and maintain, and has high durability and wrinkle resistance.

[0052] Polypropylene fiber is a synthetic fiber made of polypropylene polymer material. It has good tensile resistance, abrasion resistance and corrosion resistance. Polypropylene fiber also has low water absorption and good waterproof performance, and is light, soft and easy to dye.

[0053] Polyethylene fiber is a synthetic fiber made of polyethylene polymer material. It has high strength and elasticity, as well as good wear resistance and UV resistance. Polyethylene fiber also has low water absorption and good corrosion resistance, making it suitable for outdoor products and waterproof materials.

[0054] Polystyrene fiber is a synthetic fiber made of polystyrene polymer material. It has high strength and wear resistance, low water absorption and good insulation performance. Polystyrene fiber also has good chemical resistance and flame retardant properties, suitable for making protective clothing and insulation materials.

[0055] Butadiene fiber is a synthetic fiber made from butadiene polymer material. It has good elasticity and abrasion resistance, as well as high tensile strength and chemical resistance. Butadiene fiber also has low water absorption and good high temperature resistance, making it suitable for making elastic fabrics and industrial products.

[0056] Styrene fiber is a synthetic fiber made from styrene polymer material. It has good strength and abrasion resistance, low water absorption and good insulation properties. Styrene fiber also has good chemical resistance and flame retardant properties, suitable for making protective clothing and insulation materials.

[0057] In some specific embodiments of the present invention, the organic fiber includes one or more of polyester, polypropylene, and polyethylene fibers; in some examples of the present invention, the organic fiber is selected from polyester fibers, such as PET fibers.

[0058] In some embodiments of the present invention, the diameter of the organic fiber is 4 to 30 μm; in some specific embodiments of the present invention, the diameter of the organic fiber is 5 to 28 μm; in some examples of the present invention, the diameter of the organic fiber is 10 to 25 μm. In some specific examples, the diameter of the organic fiber can be selected from 11 μm, 12 μm, 13 μm, 15 μm, 18 μm, 20 μm or 22 μm. It is understood that the thermal insulation material of the embodiment of the present invention can be composed of organic fibers of the same diameter or a plurality of organic fibers of different diameters.

[0059] In some embodiments of the present invention, the weight of the organic fiber is 10-40 g / m 2 In some specific embodiments of the present invention, the weight of the organic fiber is 10 to 30 g / m 2 In some examples of the present invention, the weight of the organic fiber is 10 to 20 g / m 2 In some specific examples, the weight of the organic fiber can be selected from 12 g / m 2 , 14g / m 2 , 15g / m 2 , 17g / m 2 or 18g / m 2 It is understandable that the thermal insulation material of the embodiment of the present invention may be composed of one organic fiber of the same gram weight, or may be composed of a plurality of organic fibers of different gram weights.

[0060] In some embodiments of the present invention, the cross-sectional shape of the organic fiber includes one or more of a circle, a triangle, a clover, an ellipse, a T-shape, and a Y-shape; in some specific embodiments of the present invention, the cross-sectional shape of the organic fiber includes one or more of a circle, a triangle, and a clover. It is understood that the thermal insulation material of the embodiment of the present invention can be composed of organic fibers of the same cross-sectional shape, or can be composed of multiple organic fibers of different cross-sectional shapes.

[0061] In some embodiments of the present invention, the stacking method includes cross stacking or parallel stacking.

[0062] In some embodiments of the present invention, the cross-stacked fibers have a cross angle of 35 to 90°. It is understood that the cross angle refers to the angle formed by the projection of one fiber on the plane where another fiber is located and the projection of the fiber on the plane where another fiber is located.

[0063] In some specific embodiments of the present invention, the cross-stacked layers have a cross angle of 40 to 90°; in some examples of the present invention, the cross angle is 60 to 90°; in some specific examples of the present invention, the cross angle is 80 to 90°. When the cross angle is 90°, it is orthogonal stacking.

[0064] The second aspect of the present invention provides a method for preparing an embodiment of a thermal insulation material, comprising the following steps: performing point-shaped rolling on one or more organic fibers to form a thermal insulation single layer, and stacking the thermal insulation single layers to obtain a thermal insulation material. Thus, by adopting a hot rolling process such as point-shaped rolling, the surface of the organic fiber is in a point-bonded state, ensuring that the fiber has a certain fiber strength when rolled, and reducing the solid-phase heat transfer between the fibers, thereby significantly improving the thermal insulation capacity of the thermal insulation material.

[0065] In some embodiments of the present invention, the device for dot rolling is a spunbond fiber hot calender roll.

[0066] In some embodiments of the present invention, in the point rolling, the density of the rolling points is 15% to 25%.

[0067] In some embodiments of the present invention, in the point rolling, the spacing between the rolling points is (1 mm to 3 mm)×(1 mm to 3 mm).

[0068] In some embodiments of the present invention, after the dot rolling, a lamination step is further included.

[0069] In some embodiments of the present invention, after the dot rolling, a drying step is further included.

[0070] In some embodiments of the present invention, the drying temperature is 80-250°C; in some specific embodiments of the present invention, the drying temperature is 90-220°C; in some examples of the present invention, the drying temperature is 100-200°C; in some specific examples of the present invention, the drying temperature is 120-180°C.

[0071] The third aspect of the present invention provides a thermal insulation core material, comprising the thermal insulation material of the embodiment of the present invention. Thus, the thermal insulation core material has the advantages of low thermal conductivity and good thermal insulation effect.

[0072] The fourth aspect of the present invention provides an insulation board, comprising the insulation core material of the embodiment of the present invention and a barrier film, wherein the barrier film is coated on the outside of the insulation core material. Thus, the insulation board has a low thermal conductivity and a high thermal insulation effect.

[0073] In some embodiments of the present invention, the barrier film includes one or more of a double-sided aluminum-plated film, a cation-positive film, and a double-sided aluminum-free film.

[0074] In some embodiments of the present invention, the thickness of the insulation board is 5 to 30 mm; in some specific embodiments of the present invention, the thickness of the insulation board is 6 to 25 mm; in some examples of the present invention, the thickness of the insulation board is 8 to 20 mm; in some specific examples of the present invention, the thickness of the insulation board is 8 to 12 mm.

[0075] The fifth aspect of the present invention provides a method for preparing the thermal insulation board of the embodiment of the present invention, comprising the following steps: placing the thermal insulation core material into a barrier film, performing vacuum packaging, and obtaining the thermal insulation board. Therefore, the method for preparing the thermal insulation board of the present invention is simple and easy to operate.

[0076] In some embodiments of the present invention, the vacuum degree of the vacuum package is 0.0001-1Pa; in some specific embodiments of the present invention, the vacuum degree of the vacuum package is 0.0005-1Pa; in some examples of the present invention, the vacuum degree of the vacuum package is 0.0005-0.1Pa.

[0077] In some embodiments of the present invention, the vacuuming time of vacuum packaging is 10 to 120 minutes; in some specific embodiments of the present invention, the vacuuming time of vacuum packaging is 30 to 80 minutes; in some examples of the present invention, the vacuuming time of vacuum packaging is 40 to 70 minutes.

[0078] The sixth aspect of the present invention provides a temperature regulating device, which includes one or more of the thermal insulation material, thermal insulation core material, and thermal insulation board material of the embodiment of the present invention. Thus, the temperature regulating device includes the thermal insulation material, thermal insulation core material, or thermal insulation board material, which has a lower thermal conductivity and better thermal insulation effect, and thus has a good temperature regulating effect.

[0079] In some embodiments of the present invention, the temperature regulating device includes one or more of a refrigeration device, a building insulation device, and a liquefied natural gas transportation device.

[0080] In some embodiments of the present invention, the refrigeration device includes one or more of a refrigerator, a freezer, a cold storage, and an air conditioner.

[0081] In some embodiments of the present invention, a refrigeration device is a device used to reduce or control the temperature in a specific area. It usually includes components such as a compressor, a condenser, an evaporator, and a control system. The refrigeration device absorbs heat from a specific space, discharges it, and reduces the temperature through the working principle of circulating refrigerant, thereby achieving temperature regulation.

[0082] Building insulation is designed to improve the thermal insulation performance of buildings, reduce energy loss and heat transfer. It includes thermal insulation materials, thermal insulation layers, thermal insulation panels, thermal insulation coatings, etc. The function of building insulation is to reduce the heat exchange between the building and the external environment and improve the energy efficiency of the building. Thermostatic devices are usually used in combination with building insulation to control indoor temperature and provide a comfortable indoor environment by adjusting heating, air conditioning and ventilation systems.

[0083] LNG transport units are equipment used to store and transport liquefied natural gas (LNG). LNG is obtained by cooling natural gas to below its critical temperature and liquefying it for easy storage and transportation. The temperature regulating device in the LNG transport unit is used to keep the LNG at a low temperature to ensure that it remains in a liquid state. This usually involves the use of insulation materials, cryogenic equipment and cooling systems to control the temperature of the LNG.

[0084] The content of the present invention is further described in detail below through specific examples. It should also be understood that the following examples are only used to further illustrate the present invention and cannot be construed as limiting the scope of protection of the present invention. Some non-essential improvements and adjustments made by those skilled in the art based on the principles set forth in the present invention all belong to the scope of protection of the present invention. The specific process parameters and the like in the following examples are also only examples within a suitable range, that is, those skilled in the art can make a selection within a suitable range through the description herein, and are not limited to the specific data exemplified below. The raw materials, reagents or devices used in the following examples and comparative examples, unless otherwise specified, can all be obtained from conventional commercial sources, or can be obtained by existing known methods.

[0085] In a specific embodiment of the present invention, the fibers used can be purchased from Shanghai Jingfa Industrial Co., Ltd., Guangzhou Yihetai Nonwoven Fabric Co., Ltd., Guangzhou Yixian Nonwoven Fabric Co., Ltd. or Wenzhou Chaocheng Nonwoven Fabric Co., Ltd., and relevant samples can be obtained according to the design parameters.

[0086] In a specific embodiment of the present invention, the barrier film used can be purchased from Anhui Kensihui, Shanghai Toppan or Fujian Saite.

[0087] In a specific embodiment of the present invention, the fiber diameter is measured with reference to GB / T 10685-2007 "Test method for wool fiber diameter - Projection microscope method"; the fiber weight is measured with reference to GB / T 24218.1-2009 "Test methods for nonwoven fabrics of textiles - Part 1: Mass per unit area"; the thermal conductivity is measured with reference to GB / T 10295-2008 "Determination of steady-state thermal resistance and related properties of insulating materials - Heat flow meter method" and GB / T39704-2020 "Determination of effective thermal conductivity of vacuum insulation panels".

[0088] In the following examples and comparative examples:

[0089] The equipment for point rolling is a spunbond fiber hot calender roll.

[0090] In the dot rolling, the density of the rolling points was 18.9% and the spacing between the rolling points was 1.15 mm×1.15 mm.

[0091] Thermal insulation material embodiment 1

[0092] This embodiment provides a thermal insulation material, wherein the thermal insulation single layer is composed of fibers with a diameter of 25 μm and a gram weight of 18 g / m 2 The insulation layer is composed of point-rolled polyester clover-shaped fibers. The number of layers of the insulation single layer is 180.

[0093] The specific preparation steps of the thermal insulation material of this embodiment are as follows:

[0094] The fiber diameter is 25μm and the weight is 18g / m 2 The polyester clover-shaped fibers are rolled in a dotted manner to form a heat insulating single layer. The heat insulating single layer is stacked 180 times and dried at 150°C to obtain a heat insulating material.

[0095] Thermal insulation material embodiment 2

[0096] This embodiment provides a thermal insulation material, wherein the thermal insulation single layer is composed of fibers with a diameter of 13 μm and a gram weight of 17 g / m 2 The insulation layer is composed of point-rolled polyester round fibers. The number of layers of the insulation layer is 180.

[0097] The specific preparation steps of the thermal insulation material of this embodiment are as follows:

[0098] The fiber diameter is 13μm and the weight is 17g / m 2 The polyester round fibers are rolled in a dotted manner to form a heat insulating single layer. The heat insulating single layer is orthogonally stacked 180 layers and dried at 130°C to obtain a heat insulating material.

[0099] Insulation Material Comparative Example 1

[0100] This comparative example provides a thermal insulation material, wherein the thermal insulation single layer is composed of a fiber with a diameter of 25 μm and a gram weight of 18 g / m 2 The insulation is composed of 180 layers of plain polyester cloverleaf fibers.

[0101] The specific preparation steps of the thermal insulation material of this comparative example are as follows:

[0102] The fiber diameter is 25μm and the weight is 18g / m 2 The polyester clover-shaped fibers are flat rolled to form a thermal insulation single layer. The thermal insulation single layer is stacked 180 times and dried at 150°C to obtain a thermal insulation material.

[0103] Insulation material comparative example 2

[0104] This comparative example provides a thermal insulation material, wherein the thermal insulation single layer is composed of a fiber with a diameter of 13 μm and a gram weight of 17 g / m 2 The insulation is composed of 180 layers of plain polyester cloverleaf fibers.

[0105] The specific preparation steps of the thermal insulation material of this comparative example are as follows:

[0106] The fiber diameter is 13μm and the weight is 17g / m 2 The polyester clover-shaped fibers are flat rolled to form a thermal insulation single layer. The thermal insulation single layer is orthogonally stacked 180 layers and dried at 150°C to obtain a thermal insulation material.

[0107] Insulation board embodiment 1

[0108] This embodiment provides a thermal insulation board, comprising the thermal insulation material of embodiment 1 and a cation-cation membrane coated on the outside of the thermal insulation material.

[0109] The specific steps for preparing the thermal insulation board of this embodiment are as follows:

[0110] The thermal insulation material of Example 1 was placed in a cation film and vacuum packaged. The vacuuming time was 60 min and the vacuum degree was 0.001 Pa. After vacuum packaging, a thermal insulation board was obtained.

[0111] The thickness of the thermal insulation board prepared in this embodiment is 8.2 mm and the density is 220 kg / m 3 The thermal conductivity of the insulation board was tested using the double plate method (cold plate temperature 5°C, hot plate temperature 35°C, ambient temperature 23°C, humidity 50%), and the thermal conductivity was 2.25mW / (m·K).

[0112] Insulation board embodiment 2

[0113] This embodiment provides a thermal insulation board, comprising the thermal insulation material of embodiment 2 and a cation-cation membrane coated on the outside of the thermal insulation material.

[0114] The specific steps for preparing the thermal insulation board of this embodiment are as follows:

[0115] The thermal insulation material of Example 2 was placed in a cation film and vacuum packaged. The vacuuming time was 60 min and the vacuum degree was 0.0005 Pa. After vacuum packaging, a thermal insulation board was obtained.

[0116] The thickness of the thermal insulation board prepared in this embodiment is 10.5 mm and the density is 210 kg / m 3The thermal conductivity of the insulation board was tested using the double plate method (cold plate temperature 5°C, hot plate temperature 35°C, ambient temperature 23°C, humidity 50%), and the thermal conductivity was 1.95mW / (m·K).

[0117] Insulation board comparative example 1

[0118] This comparative example provides a thermal insulation board, comprising the thermal insulation material of comparative example 1 and a cation-cation membrane coated on the outside of the thermal insulation material.

[0119] The specific preparation steps of the thermal insulation board of this comparative example are as follows:

[0120] The thermal insulation material of comparative example 1 was placed in a cation film and vacuum packaged. The vacuuming time was 60 min and the vacuum degree was 0.001 Pa. After vacuum packaging, a thermal insulation board was obtained.

[0121] The thickness of the thermal insulation board prepared in this embodiment is 9.3 mm and the density is 230 kg / m 3 The thermal conductivity of the insulation board was tested using the double plate method (cold plate temperature 5°C, hot plate temperature 35°C, ambient temperature 23°C, humidity 50%), and the thermal conductivity was 2.40mW / (m·K).

[0122] Insulation board comparative example 2

[0123] This comparative example provides a thermal insulation board, comprising the thermal insulation material of comparative example 2 and a cation-cation membrane coated on the outside of the thermal insulation material.

[0124] The specific preparation steps of the thermal insulation board of this comparative example are as follows:

[0125] The thermal insulation material of comparative example 2 was placed in a cation film and vacuum packaged. The vacuuming time was 60 min and the vacuum degree was 0.001 Pa. After vacuum packaging, a thermal insulation board was obtained.

[0126] The thickness of the thermal insulation board prepared in this embodiment is 9.01 mm and the density is 210 kg / m 3 The thermal conductivity of the insulation board was tested using the double plate method (cold plate temperature 5°C, hot plate temperature 35°C, ambient temperature 23°C, humidity 50%), and the thermal conductivity was 2.06mW / (m·K).

[0127] The experimental results of the thermal insulation board Example 1 and Comparative Example 1 are summarized in Table 1.

[0128] Table 1 Experimental results of thermal insulation board Example 1 and Comparative Example 1

[0129]

[0130] Attached Figure 1 Attached is the SEM image of the thermal insulation material of Example 1. Figure 2This is the SEM image of the thermal insulation material of Comparative Example 1. After the fiber surface of Comparative Example 1 was flattened by a plain roller, Figure 2 It can be seen that there are multiple fibers bonded and in surface contact locally on the fiber surface. The thermal conductivity of the thermal insulation board made of this thermal insulation material is 2.40 mW / (m·K). Figure 1 It can be seen that the fiber surface is in point contact, the bonding area per unit area is smaller than the bonding area of ​​plain rolling, and the thermal conductivity of the insulation board made of this insulation material is reduced to 2.25mW / (m·K). Therefore, by using the hot rolling process of point rolling, the thermal insulation capacity of the insulation material can be significantly improved compared with plain rolling.

[0131] It can be seen from the test results of the above embodiments that the embodiment of the present invention adopts dot rolling to replace the existing plain rolling, which ensures a certain fiber strength when the fiber is rolled and reduces the solid phase heat transfer between the fibers. By adopting the dot rolling method, the surface state of the organic fiber felt of the thermal insulation material can be made into hot-rolled dot patterns, so that the bonding area per unit area is smaller than the bonding area of ​​the plain rolling, which can significantly improve the thermal insulation capacity of the thermal insulation material and solve the problem of low initial thermal conductivity and poor thermal insulation performance of the current thermal insulation material.

[0132] In the embodiment of the present invention, the core material of the vacuum insulation material is made of polyester fiber (PET fiber) with lower gram weight and smaller diameter by using the spunbond method, and the thermal conductivity thereof can be as low as 2 mW / (m·K) or below.

[0133] In some embodiments of the present invention, the heat insulating board of the embodiment of the present invention is applied to a refrigeration device to obtain a refrigeration device with good heat insulation performance and good thermal insulation effect. The refrigeration device includes a refrigerator, a freezer, a cold storage or an air conditioner.

[0134] In some embodiments of the present invention, the thermal insulation board according to the embodiments of the present invention is applied to a building thermal insulation device, thereby obtaining a building thermal insulation device with good thermal insulation performance and good thermal insulation effect.

[0135] In some embodiments of the present invention, the thermal insulation board according to the embodiments of the present invention is applied to a liquefied natural gas transportation device, so as to obtain a liquefied natural gas transportation device with good thermal insulation performance and good heat preservation effect.

[0136] In the description of this specification, the description with reference to the terms "some embodiments", "examples" or "specific embodiments" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

Claims

1. A thermal insulation material, characterized in that: The thermal insulation material is formed by stacking a plurality of thermal insulation single layers, wherein the thermal insulation single layers are composed of one or more organic fibers, and the organic fibers are connected by dot pattern bonding.

2. The thermal insulation material according to claim 1, characterized in that: The number of the stacked layers is 50 to 1000.

3. The thermal insulation material according to claim 1 or 2, characterized in that: The organic fiber includes one or more of polyester fiber, polypropylene fiber, polyethylene fiber, polystyrene fiber, butadiene fiber, and styrene fiber.

4. The thermal insulation material according to claim 1 or 2, characterized in that: The diameter of the organic fiber is 4-30 μm.

5. The thermal insulation material according to claim 1 or 2, characterized in that: The weight of the organic fiber is 10 to 40 g / m 2 .

6. The thermal insulation material according to claim 1 or 2, characterized in that: The cross-sectional shape of the organic fiber includes one or more of a circular shape, a triangular shape, a clover shape, an elliptical shape, a T shape, and a Y shape.

7. The method for preparing the thermal insulation material according to any one of claims 1 to 6, characterized in that: The method comprises the following steps: performing point-shaped rolling on one or more organic fibers to form a heat-insulating single layer, and stacking the heat-insulating single layers to obtain the heat-insulating material.

8. A thermal insulation core material, characterized in that: The thermal insulation material comprises the thermal insulation material according to any one of claims 1 to 6.

9. A thermal insulation board, characterized in that: It comprises the thermal insulation core material and a barrier film as described in claim 8; the barrier film covers the thermal insulation core material.

10. The thermal insulation board according to claim 9, characterized in that: The barrier film includes one or more of a double-sided aluminum-plated film, a cation-cation film, and a double-sided aluminum-free film.

11. The method for preparing the thermal insulation board according to claim 9 or 10, characterized in that: The following steps are involved: The thermal insulation core material is placed in the barrier film and vacuum packaged to obtain the thermal insulation board material.

12. The method for preparing the thermal insulation board according to claim 11, characterized in that: The vacuum degree of the vacuum packaging is 0.0001-1Pa.

13. The method for preparing the thermal insulation board according to claim 11, characterized in that: The vacuum packaging has a vacuum pumping time of 10 to 120 minutes.

14. A temperature regulating device, characterized in that: It comprises one or more of the thermal insulation material according to any one of claims 1 to 6, the thermal insulation core material according to claim 8, and the thermal insulation board material according to claim 9 or 10.

15. The temperature adjustment device according to claim 14, characterized in that: The temperature regulating device includes one or more of a refrigeration device, a building insulation device, and a liquefied natural gas transportation device.

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