Core material for vacuum insulation panel, and vacuum insulation panel and manufacturing method therefor and use thereof

Abstract

A core material for a vacuum insulation panel, comprising an aramid fiber and a bonding material, wherein the aramid fiber includes at least one of a poly(m-phenylene isophthalamide) fiber, a poly(p-phenylene terephthalamide) fiber, and heterocyclic aramid, and the length of the aramid fiber is 1 mm to 10 mm. A vacuum insulation panel, comprising the core material for a vacuum insulation panel and a barrier film material. A method for preparing the core material for a vacuum insulation panel, comprising: dispersing an aramid fiber and a bonding material into water to obtain a fiber dispersion; and treating the fiber dispersion by means of a wet process and then drying to obtain the core material for a vacuum insulation panel. A core material for a vacuum insulation panel, comprising a fiber non-woven fabric made of the aramid fiber. A vacuum insulation panel, comprising the core material for a vacuum insulation panel and a barrier film material. A method for preparing the core material for a vacuum insulation panel, comprising: dispersing an aramid fiber and a bonding material into water to obtain a fiber dispersion; and treating the fiber dispersion by means of a wet process and then drying to obtain the core material for a vacuum insulation panel. A method for preparing the vacuum insulation panel, comprising: performing heat treatment on the core material for a vacuum insulation panel; and then, encapsulating said core material with the barrier film material, and then vacuumizing to obtain the vacuum insulation panel. A thermal insulation device, comprising the core material for a vacuum insulation panel, or the vacuum insulation panel. By means of the configuration, higher-standard design and energy consumption requirements that are difficult to meet with conventional thermal insulation materials can be achieved.

Description

Core material for vacuum insulation panel, vacuum insulation panel and preparation method and application thereof

[0001] Cross-reference to Related Applications

[0002] This application claims priority to Chinese Patent Application No. 202410454966.6, filed on April 16, 2024, entitled “Core material for vacuum insulation panel, vacuum insulation panel and preparation method and application thereof”, and Chinese Patent Application No. 202410454973.6, filed on April 16, 2024, entitled “Core material for vacuum insulation panel, vacuum insulation panel and preparation method and application thereof”, the contents of which are incorporated herein by reference in their entirety. TECHNICAL FIELD

[0003] The present application belongs to the technical field of functional materials, and specifically relates to a core material for a vacuum insulation panel, a vacuum insulation panel, and a preparation method and application thereof. BACKGROUND

[0004] In household appliances with refrigeration or heating functions (such as refrigerators), it is often necessary to use thermal insulation materials. Traditional thermal insulation materials such as polyurethane rigid foam materials (or rigid polyurethane foam materials) are increasingly difficult to meet higher design and energy consumption requirements.

[0005] Vacuum insulation panels (VIPs) have good thermal insulation performance and can replace a portion of polyurethane rigid foam materials to reduce energy consumption while increasing the usable volume. A vacuum insulation panel is composed of a general core material, a barrier film material, a getter, and a desiccant. The core material of the vacuum insulation panel generally includes one or more of powders (fumed silica or fumed silicon dioxide, etc.), foams (polyurethane foam, polystyrene foam, etc.), inorganic fibers (glass fibers, etc.), and organic fibers (polyester fibers, etc.). The core material of the vacuum insulation panel must have a very high porosity, can be well evacuated, and has a certain structural strength.

[0006] The core material for a vacuum insulation panel prepared using glass fibers (such as artificial glass fibers) has some major drawbacks. First, using glass fibers requires cutting during the production of the core material, which can result in a large amount of glass fiber dust adhering to the skin and mucous membranes, and can cause strong irritation. Second, the glass fiber industry is a high-energy and high-pollution industry, and the location of its production plants is strictly limited.

[0007] A vacuum insulation panel with polyurethane foam as the core material cannot achieve an ideal vacuum state because the polyurethane foam has a low open porosity and the pore size is difficult to control. Moreover, the foam is a whole, and the contact heat transfer proportion is high.

[0008] The vacuum heat insulation board with the powder such as gas silicon as the core material has more contact points of powder particles and higher contact heat conduction under low vacuum degree.

[0009] Therefore, there is still a need to develop a new core material for vacuum heat insulation board and a vacuum heat insulation board. SUMMARY

[0010] The present application aims to at least solve one of the above technical problems in the prior art. To this end, an embodiment of the present application provides a core material for a vacuum heat insulation board.

[0011] An embodiment of the present application also provides a vacuum heat insulation board.

[0012] An embodiment of the present application also provides a method for preparing a core material for a vacuum heat insulation board, which belongs to a wet process.

[0013] An embodiment of the present application also provides a method for preparing a vacuum heat insulation board, which belongs to a wet process.

[0014] An embodiment of the present application also provides a heat insulation and heat preservation device.

[0015] An embodiment of the first aspect of the present application provides a core material for a vacuum heat insulation board, which comprises aramid fibers and a bonding material, the aramid fibers comprise at least one of poly-m-phenylene isophthalamide fibers, poly-p-phenylene terephthalamide fibers, and heterocyclic aramid fibers; and the length of the aramid fibers is 1mm to 10mm.

[0016] According to some embodiments of the present application, the aramid fibers comprise poly-m-phenylene isophthalamide fibers.

[0017] According to some embodiments of the present application, the length of the aramid fibers is 2mm to 6mm.

[0018] According to some embodiments of the present application, the fineness of the aramid fibers is 0.2dtex to 5dtex.

[0019] According to some embodiments of the present application, the fineness of the aramid fibers is 0.5dtex to 3dtex.

[0020] According to some embodiments of the present application, the density of the core material for the vacuum heat insulation board is 100g / cm 3 to 300g / cm 3 .

[0021] According to some embodiments of the present application, the porosity of the core material for the vacuum heat insulation board is 60% to 95%.

[0022] According to some embodiments of the present application, the bonding material comprises at least one of bonding fibers and a bonding agent.

[0023] According to some embodiments of the present application, the binder fibers include at least one of single component polyester fibers, single component polyethylene fibers, single component polyvinyl alcohol fibers, single component polypropylene fibers, double component sheath-core structure polyester fibers, double component sheath-core structure polyethylene fibers, double component polyethylene-polyester fibers, double component polypropylene-polyester fibers.

[0024] According to some embodiments of the present application, the binder includes at least one of polyacrylate, polyurethane, epoxy resin, starch hydrogel.

[0025] According to some embodiments of the present application, the mass fraction of the binder is ≤ 35% based on the mass of the aramid fibers.

[0026] Embodiments of the second aspect of the present application provide a vacuum insulation panel including the above-mentioned core material for vacuum insulation panels and a barrier film material, the barrier film material enclosing the core material for vacuum insulation panels.

[0027] According to some embodiments of the present application, the vacuum insulation panel further includes at least one of a desiccant or a getter, the barrier film material enclosing the core material for vacuum insulation panels and at least one of a desiccant or a getter. As an example, the core material for vacuum insulation panels is cut to form a recess, the recess being sized to accommodate at least one of a desiccant or a getter. At least one of a desiccant or a getter is placed in the recess, and the core material for vacuum insulation panels and at least one of a desiccant or a getter are enclosed using the barrier film material, and the vacuum is sealed after being evacuated.

[0028] According to some embodiments of the present application, the desiccant includes at least one of calcium carbonate, calcium sulfate, calcium oxide, calcium chloride, magnesium chloride, barium oxide.

[0029] According to some embodiments of the present application, the getter includes at least one of a barium-lithium alloy getter, a palladium oxide getter, an activated carbon getter.

[0030] According to some embodiments of the present application, the thickness of the vacuum insulation panel is at least 8 mm.

[0031] According to some embodiments of the present application, the degree of vacuum inside the vacuum insulation panel is 1 x 10 -4 Pa to 1 x 10 -3 Pa.

[0032] According to some embodiments of the present application, the thermal conductivity of the vacuum insulation panel is ≤ 1.30 mW / (m·K).

[0033] Embodiments of the third aspect of the present application provide a method for preparing a core material for a vacuum insulation panel, comprising the following steps:

[0034] (1) dispersing aramid fibers and a bonding material into water to obtain a fiber dispersion; and

[0035] (2) treating by a wet process, and drying to obtain the core material for the vacuum insulation panel.

[0036] In combination with the third aspect, a method for preparing the vacuum insulation panel described above, comprising the following steps:

[0037] (1) dispersing aramid fibers and a bonding material into water to obtain a fiber dispersion;

[0038] (2) treating by a wet process, and drying to obtain the core material for the vacuum insulation panel; and

[0039] (3) heat treating the core material for the vacuum insulation panel, then encapsulating with a barrier film material and vacuumizing to obtain the vacuum insulation panel.

[0040] Embodiments of the fourth aspect of the present application provide another method for preparing a core material for a vacuum insulation panel, comprising the following steps:

[0041] (1) dispersing aramid fibers into water to obtain a fiber dispersion; and

[0042] (2) treating by a wet process, then applying a bonding material, and drying to obtain the core material for the vacuum insulation panel.

[0043] In combination with the fourth aspect, a method for preparing the vacuum insulation panel described above, comprising the following steps:

[0044] (1) dispersing aramid fibers into water to obtain a fiber dispersion;

[0045] (2) treating by a wet process, then applying a bonding material, and drying to obtain the core material for the vacuum insulation panel; and

[0046] (3) heat treating the core material for the vacuum insulation panel, then encapsulating with a barrier film material and vacuumizing to obtain the vacuum insulation panel.

[0047] Embodiments of the fifth aspect of the present application provide a core material for a vacuum insulation panel, comprising a fiber non-woven fabric made of aramid fibers, wherein the aramid fibers comprise at least one of poly-m-phenylene isophthamide fibers, poly-p-phenylene terephthamide fibers, and heterocyclic aramid fibers, and have a length of 25 mm to 250 mm.

[0048] According to some embodiments of the present application, the aramid fibers have a fineness of 0.5 dtex to 5 dtex.

[0049] According to some embodiments of the present application, the core material for vacuum insulation panels has a density of 100 g / cm 3 to 300 g / cm 3 .

[0050] According to some embodiments of the present application, the fiber nonwoven fabric has a grammage of 10 g / m 2 to 150 g / m 2 .

[0051] Embodiments of the sixth aspect of the present application provide a vacuum insulation panel comprising the above-mentioned core material for vacuum insulation panels and a barrier film material, wherein the barrier film material encapsulates the core material for vacuum insulation panels.

[0052] Embodiments of the sixth aspect of the present application provide a method for preparing a core material for vacuum insulation panels, comprising the following steps:

[0053] (1) aramid fibers are carded by a carding machine to obtain a fiber felt; and

[0054] (2) the fiber felt is subjected to a needle punching process or a hydroentangling process to obtain a fiber nonwoven fabric, and the fiber nonwoven fabric is stacked to obtain the core material for vacuum insulation panels.

[0055] Embodiments of the seventh aspect of the present application provide a method for preparing a core material for vacuum insulation panels, comprising the following steps:

[0056] (1) aramid fibers and binder fibers are carded by a carding machine to obtain a fiber felt; and

[0057] (2) the fiber felt is subjected to a hot pressing process to obtain a fiber nonwoven fabric, and the fiber nonwoven fabric is stacked to obtain the core material for vacuum insulation panels.

[0058] According to some embodiments of the present application, the binder fibers comprise at least one of a single-component polyester fiber, a single-component polyethylene fiber, a single-component polyvinyl alcohol fiber, a single-component polypropylene fiber, a double-component sheath-core structure polyester fiber, a double-component sheath-core structure polyethylene fiber, a double-component polyethylene-polyester fiber, and a double-component polypropylene-polyester fiber.

[0059] According to some embodiments of the present application, the mass ratio of the aramid fibers to the binder fibers is ≥ 5:1.

[0060] Embodiments of the seventh aspect of the present application provide a method for preparing the above-mentioned vacuum insulation panel, comprising the following steps:

[0061] The core material for vacuum insulation panels is subjected to heat treatment, and then encapsulated by a barrier film material and vacuumized to obtain the vacuum insulation panel.

[0062] According to some embodiments of the present application, the temperature of the heat treatment is 90°C to 300°C.

[0063] According to some embodiments of the present application, the time of the heat treatment is 1 hour to 36 hours.

[0064] Embodiments of the eighth aspect of the present application provide a thermal insulation device, the thermal insulation device comprising the above-mentioned core material for a vacuum adiabatic panel or vacuum adiabatic panel; the thermal insulation device comprises a refrigerator, an incubator, a water heater, a microwave oven, a container, a building wallboard. BRIEF DESCRIPTION OF DRAWINGS

[0065] FIG. 1 is a schematic view of the structure of a vacuum adiabatic panel according to an embodiment of the present application.

[0066] Reference signs: 1: core material for a vacuum adiabatic panel; 2: barrier film material; 3: desiccant and air adsorber. DETAILED DESCRIPTION

[0067] The concept and the resulting technical effects of the present application will be described below in conjunction with embodiments, so as to fully understand the purpose, features and effects of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments of the present application, other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0068] In the description of the present application, the meaning of several is more than one, the meaning of multiple is more than two, greater than, less than, more than, etc. are understood as not including the number, above, below, etc. are understood as including the number. If it is described that the first, the second is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0069] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0070] Unless otherwise indicated herein, or in the context of a contradiction with the context, all methods described herein can be performed in any suitable order.

[0071] The use of any and all examples, or exemplary language (e.g., "such as") provided herein, is intended merely to better illuminate the application and does not pose a limitation on the scope of the application unless otherwise indicated. No language in the specification should be construed as indicating any element is essential.

[0072] Unless otherwise indicated, conventional conditions or manufacturer's recommended conditions are employed in the examples.

[0073] In household appliances with refrigeration or heating functions, such as refrigerators, it is often necessary to use thermal insulation materials. Traditional thermal insulation materials, such as polyurethane rigid foam materials, have a thermal conductivity of 19 mW / (m·K) to 23 mW / (m·K). However, in the face of increasingly stringent low-energy requirements, current thermal insulation materials are increasingly difficult to meet higher design and energy consumption requirements.

[0074] Vacuum insulation panels (VIPs) have good thermal insulation performance and can replace a portion of polyurethane rigid foam materials, thereby reducing energy consumption while increasing the usable volume.

[0075] A vacuum insulation panel is composed of a general core material, a barrier film material, a getter, and a desiccant. The core material, getter, and desiccant are placed in a bag of barrier film material, vacuumed, and then heat-sealed to obtain a vacuum insulation panel.

[0076] The core material of a vacuum insulation panel generally includes one or more of powders (fumed silica or fumed silica), foams (polyurethane foam, polystyrene foam, etc.), inorganic fibers (glass fibers, etc.), and organic fibers (polyester fibers, etc.). The core material of a vacuum insulation panel must have a very high porosity, can be well vacuumed, and have a certain structural strength. The barrier film material of a vacuum insulation panel mainly includes a polyethylene terephthalate (PET) layer, an aluminum-coated film layer, and a polyethylene (PE) adhesive layer. The barrier film material can well block the penetration of some gases and water vapor, but cannot completely achieve complete isolation. Therefore, a getter and a desiccant are usually added to improve the performance of the vacuum insulation panel and extend its service life.

[0077] The core material of a vacuum insulation panel prepared using glass fibers (e.g., man-made glass fibers) has a very high porosity and a low thermal conductivity. At the same time, glass fibers have the advantages of high temperature resistance, fire resistance, and low cost. Glass fibers can well meet the requirements of low energy consumption and high volume for thermal insulation equipment, and have become the mainstream material in the market.

[0078] However, glass fiber still has some big shortcomings. First, using glass fiber needs to be cut in the process of producing core material, which can cause a large amount of glass fiber dust to adhere to the skin and mucous membrane and produce strong irritation. The glass fiber industry belongs to a high energy consumption and high pollution industry, and the location of its production plant is strictly limited.

[0079] The vacuum insulation panel with polyurethane foam as the core material cannot be vacuumed to the ideal state due to the low open porosity of the polyurethane foam and the difficulty in controlling the pore size. Moreover, the foam is a whole, and the contact heat transfer accounts for a high proportion, so that the thermal conductivity is difficult to reach below 6.0 mW / (m·K). The vacuum insulation panel with powder such as aerogel as the core material has a large number of contact points of powder particles under low vacuum, and the contact heat transfer is high, so that the thermal conductivity is in the range of 4 mW / (m·K) to 6 mW / (m·K). They cannot meet the demand of large capacity and low energy consumption of thermal insulation equipment.

[0080] To at least partially solve one of the above technical problems, some embodiments of the present application provide a core material for a vacuum insulation panel, the core material for the vacuum insulation panel comprising aramid fibers and a bonding material, the aramid fibers comprising at least one of poly-m-phenylene isophthalamide fibers, poly-p-phenylene terephthalamide fibers, and heterocyclic aramid fibers; the aramid fibers having a length of 1 mm to 10 mm.

[0081] For the purpose of explanation but not limitation, the term "aramid fiber" used herein refers to an aromatic polyamide fiber. The term "poly-m-phenylene isophthalamide fiber" used herein can be used alternatively interchangeably with "meta-aramid". The term "poly-p-phenylene terephthalamide fiber" used herein can be used alternatively interchangeably with "para-aramid". The term "heterocyclic aramid" used herein is co-polymerized from three monomers of p-phenylenediamine, terephthaloyl chloride and a diamine containing a heterocycle, which can be used alternatively interchangeably with "aramid III".

[0082] The core material for the vacuum insulation panel according to the embodiments of the present application can form gaps between the aramid fibers during the process of the present application, so that the core material for the vacuum insulation panel has a high porosity and can have a good thermal insulation effect. The aramid fibers with a length of 1 mm to 10 mm according to the present application have a light texture and a good thermal conductivity, which can meet the requirements of large capacity and low energy consumption of thermal insulation devices.

[0083] The core material for the vacuum insulation panel according to the embodiments of the present application uses aramid fibers with an intrinsic thermal conductivity of only 130 mW / (m·K), which is one tenth of the thermal conductivity of glass fiber (the intrinsic thermal conductivity of glass fiber is 800-1500 mW / (m·K)), and the aramid fibers themselves have high thermal insulation performance.

[0084] The core material for vacuum insulation panels according to the embodiments of the present application uses aramid fibers which have higher strength than glass fibers due to the benzene ring structure containing conjugated double bonds on the main chain of macromolecules, and has a structure similar to that of a glass fiber core material after being made into a core material, with point contact between fibers, greatly reducing contact heat transfer, and an air permeability of 6000 to 7000 L / m 2 / s, and has very high porosity, and is easy to be vacuumized to prepare a vacuum insulation panel.

[0085] The core material for vacuum insulation panels according to the embodiments of the present application uses aramid fibers which have higher strength than glass fibers due to the benzene ring structure containing conjugated double bonds on the main chain of macromolecules, and has a structure similar to that of a glass fiber core material after being made into a core material, with point contact between fibers, greatly reducing contact heat transfer, and an air permeability of 6000 to 7000 L / m

[0086] In some embodiments of the present application, the aramid fiber comprises poly-m-phenylene isophthalamide fiber.

[0087] In some embodiments of the present application, the aramid fiber consists of poly-m-phenylene isophthalamide fiber.

[0088] Without wishing to be bound by theory, the applicant has unexpectedly found that a core material for vacuum insulation panels prepared from aramid fiber (especially poly-m-phenylene isophthalamide fiber) of a certain specification has good thermal insulation performance, and the thermal conductivity thereof can reach 1.1 mW / (m·K). Among various vacuum insulation panels of different materials, the performance of the vacuum insulation panel of the present application exceeds that of a vacuum insulation panel with a glass fiber core material.

[0089] In some embodiments of the present application, the length of the aramid fiber is 1 mm to 10 mm. Specifically, the length of the aramid fiber is, for example, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, or 10 mm.

[0090] In some embodiments of the present application, the length of the aramid fiber is 2 mm to 6 mm.

[0091] In some embodiments of the present application, the length of the aramid fiber is 3 mm to 5 mm.

[0092] In some embodiments of the present application, the aramid fiber has a fineness of 0.2 dtex to 5 dtex. Specifically, the aramid fiber has a fineness of, for example, 0.2 dtex, 0.3 dtex, 0.4 dtex, 0.5 dtex, 0.6 dtex, 0.7 dtex, 0.8 dtex, 0.9 dtex, 1 dtex, 1.1 dtex, 1.2 dtex, 1.3 dtex, 1.4 dtex, 1.5 dtex, 1.6 dtex, 1.7 dtex, 1.8 dtex, 1.9 dtex, 2 dtex, 2.1 dtex, 2.2 dtex, 2.3 dtex, 2.4 dtex, 2.5 dtex, 2.6 dtex, 2.7 dtex, 2.8 dtex, 2.9 dtex, 3 dtex, 3.1 dtex, 3.2 dtex, 3.3 dtex, 3.4 dtex, 3.5 dtex, 3.6 dtex, 3.7 dtex, 3.8 dtex, 3.9 dtex, 4 dtex, 4.1 dtex, 4.2 dtex, 4.3 dtex, 4.4 dtex, 4.5 dtex, 4.6 dtex, 4.7 dtex, 4.8 dtex, 4.9 dtex, 5 dtex.

[0093] In some embodiments of the present application, the aramid fiber has a fineness of 0.5 dtex to 3 dtex.

[0094] In some embodiments of the present application, the aramid fiber has a fineness of 1.5 dtex to 2.5 dtex.

[0095] In some embodiments of the present application, the core material for the vacuum adiabatic panel has a density of 100 g / cm 3 to 300 g / cm 3 . Specifically, the aramid fiber has a density of, for example, 100 g / cm 3 , 110 g / cm 3 , 120 g / cm 3 , 130 g / cm 3 , 140 g / cm 3 , 150 g / cm 3 , 160 g / cm 3 , 170 g / cm 3 , 180 g / cm 3 , 190 g / cm 3 , 200 g / cm 3 , 210 g / cm 3 , 220 g / cm 3 , 230 g / cm 3 , 240 g / cm 3 , 250 g / cm 3, 260 g / cm 3 , 270 g / cm 3 , 280 g / cm 3 , 290 g / cm 3 , 300 g / cm 3 .

[0096] In some embodiments of the present application, the core material for the vacuum insulation panel has a porosity of 60% to 95%. Specifically, the core material for the vacuum insulation panel has a porosity of, for example, 60%, 61%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%.

[0097] In some embodiments of the present application, the core material for the vacuum insulation panel has a porosity of 70% to 90%.

[0098] In some embodiments of the present application, the core material for the vacuum insulation panel has a porosity of 80% to 90%.

[0099] The core material of the vacuum insulation panel according to the embodiments of the present application has a high porosity, can be well vacuumed, and has a certain strength, and has good heat insulation performance.

[0100] In some embodiments of the present application, the bonding material includes bonding fibers and / or a bonding agent.

[0101] In some embodiments of the present application, the bonding fibers include at least one of a single-component polyester fiber, a single-component polyethylene fiber, a single-component polyvinyl alcohol fiber, a single-component polypropylene fiber, a double-component sheath-core structure polyester fiber, a double-component sheath-core structure polyethylene fiber, a double-component polyethylene-polyester fiber, and a double-component polypropylene-polyester fiber. For the purpose of explanation but not limitation, the term “double-component” used herein refers to a sheath-core structure, the sheath and the core are different components, for example, both are polyester, and are also different melting point polyester, thus called double-component. As an example, the double-component polyethylene-polyester fiber, the sheath component is polyethylene, and the core component is a polyester fiber. As an example, the double-component polypropylene-polyester fiber, the sheath component is polypropylene, and the core component is a polyester fiber. As an example, the double-component sheath-core structure polyester fiber, the sheath component and the core component are different melting point polyester fibers, for example, the melting point of the sheath component can be 100°C to 180°C, for example, 130°C to 170°C, for example, 100°C, 120°C, 150°C, or 180°C; the melting point of the core component is 240°C to 280°C, for example, 260°C.

[0102] In some embodiments of the application, the binder comprises at least one of a polyacrylate (glue), a polyurethane (glue), an epoxy resin (glue), a starch hydrogel (glue).

[0103] In some embodiments of the application, the mass fraction of the binding material is ≤ 35% based on the mass of the aramid fibers. Specifically, the mass fraction of the binding material is, for example, ≤ 35%, ≤ 34%, ≤ 33%, ≤ 32%, ≤ 31%, ≤ 30%, ≤ 29%, ≤ 28%, ≤ 27%, ≤ 26%, ≤ 25%, ≤ 24%, ≤ 23%, ≤ 22%, ≤ 21%, ≤ 20%, ≤ 19%, ≤ 18%, ≤ 17%, ≤ 16%, ≤ 15%, ≤ 14%, ≤ 13%, ≤ 12%, ≤ 11%, ≤ 10%, ≤ 9%, ≤ 8%, ≤ 7%, ≤ 6%, ≤ 5%, ≤ 4%, ≤ 3%, ≤ 2%, ≤ 1% based on the mass of the aramid fibers.

[0104] As an example, the binding material is a binding fiber. The mass fraction of the binding fiber is, for example, ≤ 35%, ≤ 34%, ≤ 33%, ≤ 32%, ≤ 31%, ≤ 30%, ≤ 29%, ≤ 28%, ≤ 27%, ≤ 26%, ≤ 25%, ≤ 24%, ≤ 23%, ≤ 22%, ≤ 21%, ≤ 20%, ≤ 19%, ≤ 18%, ≤ 17%, ≤ 16%, ≤ 15%, ≤ 14%, ≤ 13%, ≤ 12%, ≤ 11%, ≤ 10%, ≤ 9%, ≤ 8%, ≤ 7%, ≤ 6%, ≤ 5%, ≤ 4%, ≤ 3%, ≤ 2%, ≤ 1% based on the mass of the aramid fibers.

[0105] Alternatively, the binding material is a binder. The mass fraction of the binder is, for example, ≤ 10%, ≤ 9%, ≤ 8%, ≤ 7%, ≤ 6%, ≤ 5%, ≤ 4%, ≤ 3%, ≤ 2%, ≤ 1% based on the mass of the aramid fibers.

[0106] The binding material according to embodiments of the application can make the aramid fibers easy to handle during production and operation, and improve the production efficiency.

[0107] Some embodiments of the application provide a vacuum insulation panel, which comprises the above-mentioned core material for vacuum insulation panels and a barrier film material, the barrier film material enclosing the core material for vacuum insulation panels.

[0108] The vacuum insulation panel according to the embodiments of the present application, for example, can have an ultra-low thermal conductivity of λ = 1.18 mW / (m·K), and has a performance exceeding that of a vacuum insulation panel having a glass fiber as a core material. Thus, the vacuum insulation panel of the present application has a superior heat-insulating performance over a vacuum insulation panel based on a glass fiber core material, while the core material thereof does not cause pollution during production, and can be widely used in the fields of heat insulation, such as refrigerator heat insulation, residential heat insulation, cold storage heat insulation, heat-insulated box heat insulation, water heater heat insulation, microwave oven heat insulation, and the like.

[0109] In some embodiments of the present application, the vacuum insulation panel further includes a desiccant and / or a getter, and the barrier film material encloses the core material, the desiccant, and / or the getter of the vacuum insulation panel.

[0110] As an example, the vacuum insulation panel further includes a desiccant, and the barrier film material encloses the core material and the desiccant of the vacuum insulation panel. As an example, the amount of the desiccant is 1 g to 10 g, for example, 1 g, 2 g, 3 g, 4 g, 5 g, 6 g, 7 g, 8 g, 9 g, or 10 g, per vacuum insulation panel. As an example, the core material of the vacuum insulation panel is cut to form a recess, and the recess is adapted to hold the desiccant. The desiccant is placed in the recess, and the core material and the desiccant of the vacuum insulation panel are enclosed using the barrier film material, and are sealed after being vacuumed.

[0111] As an example, the vacuum insulation panel further includes a getter, and the barrier film material encloses the core material and the getter of the vacuum insulation panel. As an example, the amount of the getter is 1 g to 10 g, for example, 1 g, 2 g, 3 g, 4 g, 5 g, 6 g, 7 g, 8 g, 9 g, or 10 g, per vacuum insulation panel. As an example, the core material of the vacuum insulation panel is cut to form a recess, and the recess is adapted to hold the getter. The getter is placed in the recess, and the core material and the getter of the vacuum insulation panel are enclosed using the barrier film material, and are sealed after being vacuumed.

[0112] As an example, the vacuum insulation panel further includes a desiccant and a getter, and the barrier film material encloses the core material, the desiccant, and the getter of the vacuum insulation panel. As an example, the mass ratio of the desiccant to the getter is (2 to 6) : 1, for example, 2:1, 3:1, 4:1, 5:1, or 6:1. Without wishing to be bound by theory, in some embodiments of the present application, the core material, the desiccant, and the getter of the vacuum insulation panel are enclosed using the barrier film material, and the desiccant and the getter can be placed at the same position. As an example, the core material of the vacuum insulation panel is cut to form a recess, and the recess is adapted to hold the desiccant and the getter. The desiccant and the getter are both placed in the recess, and the core material, the desiccant, and the getter of the vacuum insulation panel are enclosed using the barrier film material, and are sealed after being vacuumed.

[0113] Referring to FIG. 1, it can be understood that in some embodiments of the present application, the barrier film 2 is used to encapsulate the core material 1 and the desiccant and the getter 3 of the vacuum insulation panel.

[0114] For example, based on each vacuum insulation panel (e.g., about 1 kg to 3 kg, such as 2 kg in weight), the amount of the desiccant is 1 g to 10 g, the amount of the getter is 1 g to 10 g, and the mass ratio of the desiccant to the getter is (2 to 6) : 1, such as 2:1, 3:1, 4:1, 5:1, or 6:1.

[0115] In combination with the second aspect, in some embodiments of the present application, the desiccant includes at least one of calcium carbonate, calcium sulfate, calcium oxide, calcium chloride, magnesium chloride, and barium oxide. For example, the desiccant is calcium carbonate.

[0116] In some embodiments of the present application, the getter includes at least one of a barium-lithium alloy getter, a palladium oxide getter, and an activated carbon getter. For example, the getter is a barium-lithium alloy getter.

[0117] Generally, the vacuumization of the core material of the vacuum insulation panel cannot completely remove the residual gas and moisture. The use of the desiccant and / or the getter can remove the residual gas and moisture in the vacuum insulation panel and maintain the vacuum degree and the gas-free and moisture-free state in the vacuum insulation panel for a relatively long period of time.

[0118] In some embodiments of the present application, the thickness of the vacuum insulation panel is at least 8 mm, such as 8 mm to 30 mm, 8 mm to 10 mm. Specifically, the thickness of the vacuum insulation panel is 8 mm, 8.1 mm, 8.2 mm, 8.3 mm, 8.4 mm, 8.5 mm, 8.6 mm, 8.7 mm, 8.8 mm, 8.9 mm, 9 mm, 9.1 mm, 9.2 mm, 9.3 mm, 9.4 mm, 9.5 mm, 9.6 mm, 9.7 mm, 9.8 mm, 9.9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, 21 mm, 22 mm, 23 mm, 24 mm, 25 mm, 26 mm, 27 mm, 28 mm, 29 mm, 30 mm, or even thicker.

[0119] In some embodiments of the present application, the vacuum degree inside the vacuum insulation panel is 1 x 10 -4 Pa to 1 x 10 -3 Pa. Specifically, the vacuum degree inside the vacuum insulation panel is 1 x 10 -4 Pa, 2 x 10 -4 Pa, 3 x 10 -4 Pa, 4 x 10-4 Pa, 5 x 10 -4 Pa, 6 x 10 -4 Pa, 7 x 10 -4 Pa, 8 x 10 -4 Pa, 9 x 10 -4 Pa, 1 x 10 -3 Pa.

[0120] In some embodiments of the present application, the thermal conductivity of the vacuum insulation panel is ≤ 1.30 mW / (m·K). Specifically, the thermal conductivity of the vacuum insulation panel is ≤ 1.30 mW / (m·K), ≤ 1.20 mW / (m·K), ≤ 1.10 mW / (m·K), ≤ 1.00 mW / (m·K), ≤ 0.9 mW / (m·K), ≤ 0.8 mW / (m·K), ≤ 0.7 mW / (m·K), ≤ 0.6 mW / (m·K), ≤ 0.5 mW / (m·K), ≤ 0.4 mW / (m·K), ≤ 0.3 mW / (m·K).

[0121] Some embodiments of the present application provide a method for preparing a core material for a vacuum insulation panel, comprising the following steps:

[0122] (1) dispersing aramid fibers and a bonding material into water to obtain a fiber dispersion; and

[0123] (2) performing sheeting, and obtaining the core material for the vacuum insulation panel after drying. The sheeting can be performed using a sheeting machine. The sheet obtained after sheeting is thin, and multiple layers of the sheet can be stacked to obtain a core material for a vacuum insulation panel with a certain target thickness.

[0124] Alternatively, some embodiments of the present application also provide a method for preparing a core material for a vacuum insulation panel, comprising the following steps:

[0125] (1) dispersing aramid fibers into water to obtain a fiber dispersion; and

[0126] (2) performing sheeting, and then applying a bonding material, and obtaining the core material for the vacuum insulation panel after drying. The sheeting can be performed using a sheeting machine. The sheet obtained after sheeting is thin, and multiple layers of the sheet can be stacked to obtain a core material for a vacuum insulation panel with a certain target thickness.

[0127] In some embodiments of the present application, the sheeting can be performed using a sheeting machine. The sheeting machine has, for example, a 50-mesh 340 mm x 440 mm screen.

[0128] In some embodiments of the present application, the sheet obtained after sheeting or the grammage of the sheeting is 15 g / m 2 to 25 g / m 2Specifically, the gram weight of the sheet material obtained after the sheeting or the sheeting is 15g / m 2 , 16g / m 2 , 17g / m 2 , 18g / m 2 , 19g / m 2 , 20g / m 2 , 21g / m 2 , 22g / m 2 , 23g / m 2 , 24g / m 2 , 25g / m 2 .

[0129] In some embodiments of the present application, the gram weight of the sheet material obtained after the sheeting or the sheeting is 18g / m 2 to 21g / m 2 .

[0130] In some embodiments of the present application, the obtained core material of the vacuum heat insulation plate can also be cut to a desired shape and size.

[0131] The present application also provides a core material of the vacuum heat insulation plate prepared according to the method for preparing the core material of the vacuum heat insulation plate.

[0132] In the process of preparing the core material of the vacuum heat insulation plate, and in the process of cutting and producing the core material of the vacuum heat insulation plate, no dust and fine fibers are generated, there is no environmental pollution and health risk, and the regulations of the European Union and other regions are met.

[0133] Some embodiments of the present application provide a method for preparing a vacuum heat insulation plate, comprising the following steps:

[0134] The core material of the vacuum heat insulation plate is heat treated, then wrapped with a barrier film material, and vacuumized to obtain the vacuum heat insulation plate.

[0135] Specifically, a method for preparing a vacuum heat insulation plate, comprising the following steps:

[0136] (1) dispersing aramid fibers and a bonding material into water to obtain a fiber dispersion.

[0137] (2) sheeting, and drying to obtain the core material of the vacuum heat insulation plate; wherein a sheeting machine can be used for sheeting. The sheet material obtained after sheeting is thin, and multiple sheet materials can be stacked to obtain a core material of the vacuum heat insulation plate with a certain target thickness. In addition, the obtained core material of the vacuum heat insulation plate can also be cut to a desired shape and size.

[0138] (3) heat treating the core material for the vacuum insulation panel, and then vacuumizing after being wrapped with the barrier film material to obtain the vacuum insulation panel. Specifically, the core material for the vacuum insulation panel can be put into a bag of the barrier film material, and then wrapped and vacuumized using a vacuum high-temperature sealing machine, and after the vacuum degree reaches a target vacuum degree, the bag is sealed.

[0139] Alternatively, some embodiments of the present application also provide a method for preparing a vacuum insulation panel, comprising the following steps:

[0140] (1) dispersing aramid fibers into water to obtain a fiber dispersion.

[0141] (2) performing sheeting, and then applying a bonding material, and drying to obtain the core material for the vacuum insulation panel; wherein a sheeting machine can be used to perform the sheeting. The sheeting can be thin, and multiple layers of the sheeting can be stacked to obtain a core material for the vacuum insulation panel with a target thickness. In addition, the core material for the vacuum insulation panel can be cut to a desired shape and size.

[0142] (3) heat treating the core material for the vacuum insulation panel, and then vacuumizing after being wrapped with the barrier film material to obtain the vacuum insulation panel. Specifically, the core material for the vacuum insulation panel can be put into a bag of the barrier film material, and then wrapped and vacuumized using a vacuum high-temperature sealing machine, and after the vacuum degree reaches a target vacuum degree, the bag is sealed.

[0143] The present application does not produce dust and fine fibers during the preparation of the vacuum insulation panel, and does not cause environmental pollution and health risks, and meets the regulatory requirements of the European Union and other regions.

[0144] In some embodiments of the present application, the sheeting can be performed using a sheeting machine. The sheeting machine has, for example, a 50-mesh 340mm x 440mm sheeting screen.

[0145] In some embodiments of the present application, the sheeting or the grammage of the sheeting obtained after the sheeting is 15g / m 2 to 25g / m 2 . Specifically, the sheeting or the grammage of the sheeting obtained after the sheeting is 15g / m 2 , 16g / m 2 , 17g / m 2 , 18g / m 2 , 19g / m 2 , 20g / m 2 , 21g / m 2 , 22g / m 2 , 23g / m 2 , 24g / m 2 , or 25g / m 2 .

[0146] In some embodiments of the present application, the weight of the sheet or the weight of the sheeting obtained after the sheeting is 18 g / m 2 to 21 g / m 2 .

[0147] In some embodiments of the present application, the temperature of the heat treatment is 90℃ to 300℃. Specifically, the temperature of the heat treatment is 90℃, 100℃, 110℃, 120℃, 130℃, 140℃, 150℃, 160℃, 170℃, 180℃, 190℃, 200℃, 210℃, 220℃, 230℃, 240℃, 250℃, 260℃, 270℃, 280℃, 290℃, 300℃.

[0148] In some embodiments of the present application, the temperature of the heat treatment is 120℃ to 250℃.

[0149] In some embodiments of the present application, the temperature of the heat treatment is 150℃ to 230℃.

[0150] In some embodiments of the present application, the time of the heat treatment is 1 hour to 36 hours. Specifically, the time of the heat treatment is 1 hour, 2 hours, 3 hours, 4 hours, 5 hours, 6 hours, 7 hours, 8 hours, 9 hours, 10 hours, 11 hours, 12 hours, 13 hours, 14 hours, 15 hours, 16 hours, 17 hours, 18 hours, 19 hours, 20 hours, 21 hours, 22 hours, 23 hours, 24 hours, 25 hours, 26 hours, 27 hours, 28 hours, 29 hours, 30 hours, 31 hours, 32 hours, 33 hours, 34 hours, 35 hours, 36 hours.

[0151] In some embodiments of the present application, the time of the heat treatment is 1.5 hours to 12 hours.

[0152] In some embodiments of the present application, the time of the heat treatment is 1.5 hours to 8 hours.

[0153] As an example, the heat treatment is at a temperature of 90℃ to 300℃ for 1 hour to 36 hours. As an example, the heat treatment is at a temperature of 120℃ to 250℃ for 1.5 hours to 12 hours. As an example, the heat treatment is at a temperature of 150℃ to 230℃ for 1.5 hours to 8 hours.

[0154] The present application uses aramid fiber of a specific specification in combination with a wet process to obtain a core material for a vacuum insulation panel and a vacuum insulation panel having a relatively optimal thermal conductivity, a relatively light texture, a good heat insulation effect, and safety and no pollution, wherein the aramid fiber has a length of 1 mm to 10 mm. For the purpose of explanation but not limitation, aramid fiber that is too short cannot be screened and is not suitable for the wet process of the present application. In addition, aramid fiber that is too long will result in a poor dispersion state and is not suitable for the wet process of the present application.

[0155] The present application also provides a vacuum insulation panel prepared according to the method for preparing a vacuum insulation panel.

[0156] Some embodiments of the present application provide a heat insulation device comprising the above-mentioned core material for a vacuum insulation panel or the above-mentioned vacuum insulation panel.

[0157] In some embodiments of the present application, the heat insulation device is a refrigerator. The above-mentioned core material for a vacuum insulation panel or the above-mentioned vacuum insulation panel can be used in the heat insulation component of the refrigerator to achieve a heat insulation effect.

[0158] In some embodiments of the present application, the heat insulation device is a heat preservation box. The above-mentioned core material for a vacuum insulation panel or the above-mentioned vacuum insulation panel can be used in the heat insulation component of the heat preservation box to achieve a heat insulation effect.

[0159] In some embodiments of the present application, the heat insulation device is a water heater. The above-mentioned core material for a vacuum insulation panel or the above-mentioned vacuum insulation panel can be used in the heat insulation component of the water heater to achieve a heat insulation effect.

[0160] In some embodiments of the present application, the heat insulation device is a microwave oven. The above-mentioned core material for a vacuum insulation panel or the above-mentioned vacuum insulation panel can be used in the heat insulation component of the microwave oven to achieve a heat insulation effect.

[0161] In some embodiments of the present application, the heat insulation device is a container. The above-mentioned core material for a vacuum insulation panel or the above-mentioned vacuum insulation panel can be used in the heat insulation component of the container (for example, a refrigerated container, a cold chain transport container) to achieve a heat insulation effect.

[0162] In some embodiments of the present application, the heat insulation device is a building wallboard. The above-mentioned core material for a vacuum insulation panel or the above-mentioned vacuum insulation panel can be used in the heat insulation component of the building wallboard (for example, a residential wall, etc.) to achieve a heat insulation effect.

[0163] In some embodiments of the present application, the heat insulation device is a cold storage. The above-mentioned core material for a vacuum insulation panel or the above-mentioned vacuum insulation panel can be used in the heat insulation component of the cold storage to achieve a heat insulation effect.

[0164] The heat conduction coefficient of the heat insulation device according to the embodiments of the present application is very low, and the heat insulation device has very high heat insulation performance. No dust and fine fibers are generated in the production process, and there is no environmental pollution and health risk, which meets the regulatory requirements of the European Union and other regions.

[0165] It can be understood that the vacuum insulation board according to the embodiments of the present application uses aramid fibers of a specific specification, has high porosity, an optimal heat conduction coefficient, and light texture, and can achieve good heat insulation effect. In the process of preparing the vacuum insulation board and the process of cutting and processing the core material for the vacuum insulation board, no dust and fine fibers are generated, and there is no environmental pollution and health risk.

[0166] The technical solutions of the present application will be better understood in combination with specific embodiments.

[0167] Embodiment 1

[0168] In this embodiment, a core material for a vacuum insulation board and a vacuum insulation board are prepared.

[0169] In this embodiment, a core material for a vacuum insulation board is prepared by using poly-m-phenylene isophthalamide fibers through a wet method, and then a vacuum insulation board is prepared by using the core material.

[0170] The specific preparation method is as follows:

[0171] (1) Poly-m-phenylene isophthalamide fibers with a fineness of 2.0 dtex and a length of 6 mm and 2.2 dtex bicomponent sheath-core structure polyester fibers (the sheath component of the bicomponent sheath-core structure polyester fibers has a melting point of 150°C, and the core component has a melting point of 260°C, which are commercially available) are mixed uniformly at a mass ratio of 100:7.5, and then the mixture is dispersed in 300L of water in batches, and after uniform dispersion, a fiber dispersion (slurry concentration of 8 parts per million) is obtained;

[0172] (2) A 340mm×440mm screen with a mesh size of 50 is used to make a sheet, and an appropriate amount of mixed fibers is added every time two sheets are obtained to maintain the concentration of the mixed fibers in the water substantially unchanged. The sheet is filtered to remove water and dried to a water content of 80%. The sheet is manually separated from the screen to obtain a single sheet. A plurality of sheets are stacked to obtain the core material for the vacuum insulation board;

[0173] (3) The core material for the vacuum insulation board is placed in a 160°C oven for 6 hours, and then the temperature is adjusted to 210°C. After drying for 3 hours, the core material is taken out, and then placed in a bag of barrier film material together with a getter (1g) and a desiccant (4g). The bag is sealed in a vacuum sealing machine to obtain a 9mm-thick vacuum insulation board.

[0174] Embodiment 2

[0175] A core material for a vacuum adiabatic panel and a vacuum adiabatic panel were prepared.

[0176] A core material for a vacuum adiabatic panel was prepared using poly-m-phenylene isophthamide fibers by a wet method, and then a vacuum adiabatic panel was manufactured using the core material.

[0177] The specific preparation method is as follows:

[0178] (1) 2.5 dtex poly-m-phenylene isophthamide fibers and 2.2 dtex bicomponent sheath-core polyester fibers (the sheath component of the bicomponent sheath-core polyester fibers has a melting point of 150°C, and the core component has a melting point of 260°C, commercially available) were mixed at a mass ratio of 100:15, and then uniformly dispersed in 300 L of water in batches to obtain a fiber dispersion (pulp concentration of 8 parts per million);

[0179] (2) A 340 mm x 440 mm screen with a mesh size of 50 was used to make a sheet, and an appropriate amount of mixed fibers was added every time two sheets were obtained to maintain the concentration of the mixed fibers in the water. The sheets were filtered to remove water and dried to a moisture content of about 80%. The sheets were manually separated from the screen to obtain single sheets. A plurality of sheets were stacked to obtain the core material for the vacuum adiabatic panel;

[0180] (3) The core material for the vacuum adiabatic panel was placed in a 170°C oven and dried for 2.5 hours, and then the temperature was adjusted to 200°C. After drying for 3.5 hours, the core material was removed and placed in a bag with a getter and a desiccant, and then sealed in a vacuum packaging machine to obtain a 9 mm thick vacuum adiabatic panel.

[0181] Example 3

[0182] A core material for a vacuum adiabatic panel and a vacuum adiabatic panel were prepared.

[0183] A core material for a vacuum adiabatic panel was prepared using poly-m-phenylene isophthamide fibers by a wet method, and then a vacuum adiabatic panel was manufactured using the core material.

[0184] The specific preparation method is as follows:

[0185] (1) 1.5 dtex poly-m-phenylene isophthamide fibers and 2.2 dtex bicomponent sheath-core polyester fibers (the sheath component of the bicomponent sheath-core polyester fibers has a melting point of 150°C, and the core component has a melting point of 260°C, commercially available) were mixed at a mass ratio of 100:20, and then uniformly dispersed in 300 L of water in batches to obtain a fiber dispersion (pulp concentration of 8 parts per million);

[0186] (2) Using a 50-mesh 340 mm x 440 mm wire mesh to make a sheet, and adding an appropriate amount of the mixed fibers every time two sheets are obtained to maintain the concentration of the fibers in water substantially constant. The sheet is filtered to remove water, and dried to a moisture content of about 80%. The sheet is manually separated from the wire mesh to obtain single sheets. A plurality of the sheets are stacked to obtain the core material for the vacuum insulation panel;

[0187] (3) The core material for the vacuum insulation panel is placed in a 150°C oven, dried for 8 hours, and then the temperature is adjusted to 200°C. After drying for 2 hours, the core material is removed, and then placed in a bag of barrier film material together with a getter (1.2 g) and a desiccant (4 g). The bag is sealed in a vacuum sealer to obtain a 9 mm thick vacuum insulation panel.

[0188] Example 4

[0189] In this example, a core material for a vacuum insulation panel and a vacuum insulation panel are prepared.

[0190] A core material for a vacuum insulation panel is prepared using poly-m-phenylene isophthalamide fibers by a wet process, and then the core material is used to make a vacuum insulation panel.

[0191] The specific preparation method is as follows:

[0192] (1) Poly-m-phenylene isophthalamide fibers with a fineness of 4.0 dtex and a length of 9 mm and 2.2 dtex bicomponent sheath-core polyester fibers (the sheath component of the bicomponent sheath-core polyester fibers has a melting point of 150°C, and the core component has a melting point of 260°C, commercially available) are mixed in a mass ratio of 100:7.5 to obtain mixed fibers. The mixed fibers are dispersed in 300 L of water in batches, and after uniform dispersion, a fiber dispersion (slurry concentration of 8 parts per million) is obtained.

[0193] (2) A 50-mesh 340 mm x 440 mm wire mesh is used to make a sheet, and an appropriate amount of the component mixed fibers is added every time two sheets are obtained to maintain the concentration of the fibers in water substantially constant. The sheet is filtered to remove water, and dried to a moisture content of about 80%. The sheet is manually separated from the wire mesh to obtain single sheets. A plurality of the sheets are stacked to obtain the core material for the vacuum insulation panel;

[0194] (3) The core material for the vacuum insulation panel is placed in a 180°C oven, dried for 6 hours, and then removed. The core material is then placed in a bag of barrier film material together with a getter (1.5 g) and a desiccant (5 g). The bag is sealed in a vacuum sealer to obtain a 9 mm thick vacuum insulation panel.

[0195] Example 5

[0196] In this example, a core material for a vacuum insulation panel and a vacuum insulation panel are prepared.

[0197] A core material for a vacuum insulation panel is prepared using poly-m-phenylene isophthamide fibers by a wet method, and then a vacuum insulation panel is produced using the core material.

[0198] The specific preparation method is as follows:

[0199] (1) Poly-m-phenylene isophthamide fibers with a fineness of 2.0 dtex and a length of 6 mm are taken and dispersed in 300 L of water to obtain a fiber dispersion (pulp concentration of 8 parts per million);

[0200] (2) A 340 mm x 440 mm screen with a mesh of 50 is used to make a sheet, and after two sheets are obtained, an appropriate amount of poly-m-phenylene isophthamide fibers is added to maintain the concentration of the fibers in the water substantially unchanged. The sheet is filtered to remove water and dried to a moisture content of 80%, and then 1% of polyacrylate based on the mass of the poly-m-phenylene isophthamide fibers is sprayed thereon. The sheet is manually separated from the screen to obtain a single sheet. The sheets are sequentially stacked to obtain the core material for the vacuum insulation panel;

[0201] (3) The core material for the vacuum insulation panel is placed in a 210°C oven, dried for 2.5 hours, and then taken out. The core material is placed in a bag of barrier material together with a getter (0.8 g) and a drying agent (5 g), and then sealed in a vacuum sealer to obtain a 9 mm thick vacuum insulation panel.

[0202] Example 6

[0203] A core material for a vacuum insulation panel and a vacuum insulation panel are prepared in this example.

[0204] A core material for a vacuum insulation panel is prepared using poly-m-phenylene isophthamide fibers by a wet method, and then a vacuum insulation panel is produced using the core material.

[0205] The specific preparation method is as follows:

[0206] (1) Poly-m-phenylene isophthamide fibers with a fineness of 2.0 dtex and a length of 6 mm are taken and dispersed in 300 L of water to obtain a fiber dispersion (pulp concentration of 8 parts per million);

[0207] (2) A 340 mm x 440 mm screen with a mesh of 50 is used to make a sheet, and after two sheets are obtained, an appropriate amount of poly-m-phenylene isophthamide fibers is added to maintain the concentration of the fibers in the water substantially unchanged. The sheet is filtered to remove water and dried to a moisture content of 80%, and then 1% of polyacrylate based on the mass of the poly-m-phenylene isophthamide fibers is sprayed thereon. The sheet is manually separated from the screen to obtain a single sheet. The sheets are sequentially stacked to obtain the core material for the vacuum insulation panel;

[0208] (3) The core material of the vacuum insulation panel was placed in a 210°C oven, dried for 2.5 hours, and then taken out. The core material was then placed in a bag of barrier film material together with the getter (1 g) and the desiccant (4 g), and the bag was sealed in a vacuum sealer to obtain a 9 mm thick vacuum insulation panel.

[0209] Comparative Example 1

[0210] This comparative example used a commercially available 9 mm thick glass fiber core material for vacuum insulation panels. The preparation method was substantially the same as step (3) of Example 5, and is as follows:

[0211] The 9 mm glass fiber core material was placed in a 210°C oven, dried for 2.5 hours, and then taken out. The core material was then placed in a bag of barrier film material together with the getter (0.8 g) and the desiccant (5 g), and the bag was sealed in a vacuum sealer to obtain a vacuum insulation panel.

[0212] Comparative Example 2

[0213] This comparative example used a poly-m-phenylene isophthalamide fiber: bicomponent sheath-core structure polyester fiber = 100:35 (mass ratio), and the remaining process was the same as Example 1.

[0214] The properties of the products prepared in each example and comparative example are shown in Table 1 below.

[0215] Table 1

[0216] The thermal conductivity was measured according to the national standard GB / T 10294 / 10295 using the steady-state heat flow method.

[0217] As can be seen from Table 1, the vacuum insulation panels prepared in the examples of the present application have a more optimal thermal conductivity. Under the same conditions, the thermal conductivity of the vacuum insulation panel prepared using glass fiber is significantly worse than that of the present application.

[0218] In addition, through experiments, if poly-m-phenylene isophthalamide fibers with a length of 0.5 mm are used, the wire screen cannot be made. In addition, too long aramid fibers will result in a poor dispersion state, which is not suitable for the wet process of the present application.

[0219] In addition, through experiments, if neither bonding fibers nor adhesives are added during the preparation of the vacuum insulation panel, although the thermal conductivity is low, the results are the best, but the operability of the production process is poor and the production efficiency is reduced.

[0220] In some embodiments of the present application, the present application provides a core material for a vacuum insulation panel, the core material for a vacuum insulation panel comprising a fiber nonwoven fabric made of aramid fibers, the aramid fibers comprising at least one of poly-m-phenylene isophthalamide fibers, poly-para-phenylene terephthalamide fibers, and heterocyclic aramid fibers; the aramid fibers having a length of 25 mm to 250 mm.

[0221] In some embodiments of the present application, the aramid fibers comprise poly-m-phenylene isophthalamide fibers.

[0222] In some embodiments of the present application, the aramid fibers consist of poly-m-phenylene isophthalamide fibers.

[0223] Without wishing to be bound by theory, the applicant has surprisingly found that a core material for a vacuum insulation panel made of aramid fibers of certain specifications, in particular poly-m-phenylene isophthalamide fibers, has good thermal insulation performance. Among various vacuum insulation panels of different materials, the vacuum insulation panel of the present application outperforms a vacuum insulation panel having glass fibers as the core material.

[0224] In some embodiments of the present application, the aramid fibers have a length of 25 mm to 250 mm. Specifically, the aramid fibers have a length of, for example, 25 mm, 26 mm, 27 mm, 28 mm, 29 mm, 30 mm, 31 mm, 32 mm, 33 mm, 34 mm, 35 mm, 36 mm, 37 mm, 38 mm, 39 mm, 40 mm, 50 mm, 60 mm, 61 mm, 62 mm, 63 mm, 64 mm, 65 mm, 66 mm, 67 mm, 68 mm, 69 mm, 70 mm, 71 mm, 72 mm, 73 mm, 74 mm, 75 mm, 76 mm, 77 mm, 78 mm, 79 mm, 80 mm, 81 mm, 82 mm, 83 mm, 84 mm, 85 mm, 86 mm, 87 mm, 88 mm, 89 mm, 90 mm, 91 mm, 92 mm, 93 mm, 94 mm, 95 mm, 100 mm, 110 mm, 120 mm, 130 mm, 140 mm, 150 mm, 160 mm, 170 mm, 180 mm, 190 mm, 200 mm, 210 mm, 220 mm, 230 mm, 240 mm, 250 mm.

[0225] In some embodiments of the present application, the aramid fibers have a length of 25 mm to 150 mm.

[0226] In some embodiments of the present application, the aramid fibers have a length of 38 mm to 100 mm.

[0227] In some embodiments of the present application, the aramid fiber has a fineness of 0.5 dtex to 5 dtex. Specifically, the aramid fiber has a fineness of, for example, 0.5 dtex, 0.6 dtex, 0.7 dtex, 0.8 dtex, 0.9 dtex, 1 dtex, 1.1 dtex, 1.2 dtex, 1.3 dtex, 1.4 dtex, 1.5 dtex, 1.6 dtex, 1.7 dtex, 1.8 dtex, 1.9 dtex, 2 dtex, 2.1 dtex, 2.2 dtex, 2.3 dtex, 2.4 dtex, 2.5 dtex, 2.6 dtex, 2.7 dtex, 2.8 dtex, 2.9 dtex, 3 dtex, 3.1 dtex, 3.2 dtex, 3.3 dtex, 3.4 dtex, 3.5 dtex, 3.6 dtex, 3.7 dtex, 3.8 dtex, 3.9 dtex, 4 dtex, 4.1 dtex, 4.2 dtex, 4.3 dtex, 4.4 dtex, 4.5 dtex, 4.6 dtex, 4.7 dtex, 4.8 dtex, 4.9 dtex, 5 dtex.

[0228] In some embodiments of the present application, the aramid fiber has a fineness of 1 dtex to 3 dtex.

[0229] In some embodiments of the present application, the aramid fiber has a fineness of 1.5 dtex to 2.5 dtex.

[0230] In some embodiments of the present application, the vacuum adiabatic panel core material has a density of 100 g / cm 3 to 300 g / cm 3 . Specifically, the aramid fiber has a density of, for example, 100 g / cm 3 , 110 g / cm 3 , 120 g / cm 3 , 130 g / cm 3 , 140 g / cm 3 , 150 g / cm 3 , 160 g / cm 3 , 170 g / cm 3 , 180 g / cm 3 , 190 g / cm 3 , 200 g / cm 3 , 210 g / cm 3 , 220 g / cm 3 , 230 g / cm 3 , 240 g / cm 3 , 250 g / cm 3 , 260 g / cm 3, 270 g / cm 3 , 280 g / cm 3 , 290 g / cm 3 , 300 g / cm 3 .

[0231] In some embodiments of the present application, the porosity of the core material for the vacuum adiabatic panel is 75% to 95%. Specifically, the porosity of the core material for the vacuum adiabatic panel is, for example, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, or 95%.

[0232] In some embodiments of the present application, the porosity of the core material for the vacuum adiabatic panel is 80% to 90%.

[0233] In some embodiments of the present application, the porosity of the core material for the vacuum adiabatic panel is 84% to 90%.

[0234] In some embodiments of the present application, the basis weight of the fiber nonwoven fabric is 10 g / m 2 to 150 g / m 2 . Specifically, the basis weight of the fiber nonwoven fabric is, for example, 10 g / m 2 , 11 g / m 2 , 12 g / m 2 , 13 g / m 2 , 14 g / m 2 , 15 g / m 2 , 16 g / m 2 , 17 g / m 2 , 18 g / m 2 , 19 g / m 2 , 20 g / m 2 , 21 g / m 2 , 22 g / m 2 , 23 g / m 2 , 24 g / m 2 , 25 g / m 2 , 26 g / m 2 , 27 g / m 2 , 28 g / m 2 , 29 g / m 2 , 30 g / m 2 , 31 g / m 2 , 32 g / m 2 , 33 g / m 2 , 34 g / m 2 , 35 g / m 2 , 36 g / m 2 , 37 g / m2 , 38 g / m 2 , 39 g / m 2 , 40 g / m 2 , 50 g / m 2 , 60 g / m 2 , 61 g / m 2 , 62 g / m 2 , 63 g / m 2 , 64 g / m 2 , 65 g / m 2 , 66 g / m 2 , 67 g / m 2 , 68 g / m 2 , 69 g / m 2 , 70 g / m 2 , 71 g / m 2 , 72 g / m 2 , 73 g / m 2 , 74 g / m 2 , 75 g / m 2 , 76 g / m 2 , 77 g / m 2 , 78 g / m 2 , 79 g / m 2 , 80 g / m 2 , 81 g / m 2 , 82 g / m 2 , 83 g / m 2 , 84 g / m 2 , 85 g / m 2 , 86 g / m 2 , 87 g / m 2 , 88 g / m 2 , 89 g / m 2 , 90 g / m 2 , 91 g / m 2 , 92 g / m 2 , 93 g / m 2 , 94 g / m 2 , 95 g / m 2 , 100 g / m 2 , 110 g / m 2 , 120 g / m 2 , 130 g / m 2 , 140 g / m 2 , 150 g / m 2 .

[0235] In some embodiments of the application, the fiber nonwoven fabric has a grammage of 10 g / m 2 to 100 g / m 2 .

[0236] In some embodiments of the present application, the fiber nonwoven fabric has a grammage of 10 g / m 2 to 60 g / m 2 .

[0237] In some embodiments of the present application, the present application provides a vacuum insulation panel, which comprises the above-mentioned core material for vacuum insulation panel and barrier film material, and the barrier film material encloses the core material for vacuum insulation panel.

[0238] In some embodiments of the present application, the vacuum insulation panel further comprises a desiccant and / or a getter, and the barrier film material encloses the core material for vacuum insulation panel, the desiccant and / or the getter. The description of the desiccant and the getter can refer to the previous embodiments, which will not be repeated here.

[0239] In some embodiments of the present application, the thickness of the vacuum insulation panel is at least 8 mm, for example, 8 mm to 30 mm, 8 mm to 10 mm. Specifically, the thickness of the vacuum insulation panel is 8 mm, 8.1 mm, 8.2 mm, 8.3 mm, 8.4 mm, 8.5 mm, 8.6 mm, 8.7 mm, 8.8 mm, 8.9 mm, 9 mm, 9.1 mm, 9.2 mm, 9.3 mm, 9.4 mm, 9.5 mm, 9.6 mm, 9.7 mm, 9.8 mm, 9.9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, 21 mm, 22 mm, 23 mm, 24 mm, 25 mm, 26 mm, 27 mm, 28 mm, 29 mm, 30 mm, or even thicker.

[0240] In some embodiments of the present application, the vacuum degree inside the vacuum insulation panel is 1 x 10 -4 Pa to 1 x 10 -3 Pa. Specifically, the vacuum degree inside the vacuum insulation panel is 1 x 10 -4 Pa, 2 x 10 -4 Pa, 3 x 10 -4 Pa, 4 x 10 -4 Pa, 5 x 10 -4 Pa, 6 x 10 -4 Pa, 7 x 10 -4 Pa, 8 x 10 -4 Pa, 9 x 10 -4 Pa, or 1 x 10 -3 Pa.

[0241] In some embodiments of the present application, the thermal conductivity of the vacuum insulation panel is ≤ 1.50 mW / (m·K). Specifically, the thermal conductivity of the vacuum insulation panel is ≤ 1.50 mW / (m·K), ≤ 1.40 mW / (m·K), ≤ 1.30 mW / (m·K), ≤ 1.20 mW / (m·K), ≤ 1.10 mW / (m·K), ≤ 1.00 mW / (m·K), ≤ 0.9 mW / (m·K), ≤ 0.8 mW / (m·K), ≤ 0.7 mW / (m·K), ≤ 0.6 mW / (m·K), ≤ 0.5 mW / (m·K), ≤ 0.4 mW / (m·K), ≤ 0.3 mW / (m·K).

[0242] In some embodiments of the present application, the present application provides a method for preparing a core material for a vacuum insulation panel, comprising the following steps:

[0243] (1) The aramid fibers are carded by a carding machine to obtain a non-strength fiber felt; optionally, different thicknesses of non-strength fiber felt can be selected according to the desired fiber non-woven fabric basis weight;

[0244] (2) The fiber felt is obtained by needle punching process or water jet process to obtain a fiber non-woven fabric, and the fiber non-woven fabric is laminated to obtain the core material for the vacuum insulation panel. In addition, the obtained core material for the vacuum insulation panel can be cut into the desired shape and size.

[0245] For the purpose of explanation but not limitation, step (1) belongs to carding method, the specific specification of aramid fibers used in the present application is further dispersed, mixed uniformly, and separated into interlaced single fibers by using the interaction between the paired roller surface needle cloth, and a uniform fiber network is formed by using its own curling and friction. The fiber network has low strength and can be used as a laminated core material for a vacuum insulation panel.

[0246] For the purpose of explanation but not limitation, the needle punching process in step (2) belongs to needle punching method, the specific specification of aramid fibers used in the present application is crimped short fibers, which are formed into a uniform fiber network after carding by a carding machine, and then are cross-laminated to reach the target basis weight, and then are needle punched by a needle punching machine. The needles of the needle punching machine have hooks, which repeatedly pierce the fiber network to hook and reinforce the fibers, forming a needle punched non-woven fabric. The non-woven fabric has no warp and weft, and the fibers are randomly arranged, and the performance of the warp and weft has little difference.

[0247] For the purpose of explanation but not limitation, the hydroentanglement process in step (2) belongs to hydroentanglement, the specific specification of aramid fiber used in the present application is crimped staple fiber, after being carded by a carding machine to form a uniform fiber web, the target gram weight is reached by cross-laying, and then the hydroentanglement is carried out by a hydroentanglement machine. The hydroentanglement nonwoven process produces hydraulic action by continuous jetting of high-pressure water flow, so that the arranged fibers begin to surge, displace and rearrange, and entangle with each other. The fiber web is reinforced under this action and has certain physical and mechanical properties.

[0248] The needle punching ratio or the hydroentanglement ratio in step (2) can be appropriately reduced, and the strength and the needle punching ratio or the hydroentanglement ratio are balanced. The needle punching ratio is 10% to 80%, for example, 15% to 65%, for example, 20% to 50%. The hydroentanglement ratio is 10% to 80%, for example, 15% to 65%, for example, 20% to 50%.

[0249] Alternatively, in some embodiments of the present application, the present application also provides a method for preparing a core material for a vacuum insulation panel, comprising the following steps:

[0250] (1) aramid fiber and binder fiber are carded by a carding machine to obtain a non-strength fiber felt; optionally, different thicknesses of non-strength fiber felts can be selected according to the desired gram weight of the fiber non-woven fabric;

[0251] (2) the fiber felt is obtained by a hot pressing process to obtain a fiber non-woven fabric, and the fiber non-woven fabric is laminated to obtain the core material for the vacuum insulation panel. In addition, the obtained core material for the vacuum insulation panel can be cut to a desired shape and size.

[0252] For the purpose of explanation but not limitation, the hot pressing process in step (2) belongs to hot pressing, the specific specification of aramid fiber used in the present application is crimped staple fiber, which is pre-mixed with low-melting binder fibers (such as polypropylene fibers or polyester fibers, etc.) in a proportion by a coarse opening process, and then further opened and mixed by a fine opening process, and then carded by a carding machine to form a uniform fiber web, and then cross-laid to reach the target gram weight, and then the low-melting fibers are melted by hot pressing and hot rolling, and then cooled to form a non-woven fabric with strength.

[0253] In some embodiments of the present application, the binder fiber comprises at least one of a single component polyester fiber, a single component polyethylene fiber, a single component polyvinyl alcohol fiber, a single component polypropylene fiber, a double component sheath-core structure polyester fiber, a double component sheath-core structure polyethylene fiber, a double component polyethylene-polyester fiber, a double component polypropylene-polyester fiber. For the purpose of explanation but not limitation, the term "double component" as used herein refers to a sheath-core structure, the sheath and the core are different components, for example, both are polyester, and also different melting point polyester, thus called double component. As an example, a double component polyethylene-polyester fiber, the sheath component is polyethylene, and the core component is a polyester fiber. As an example, a double component polypropylene-polyester fiber, the sheath component is polypropylene, and the core component is a polyester fiber. As an example, a double component sheath-core structure polyester fiber, the sheath component and the core component are different melting point polyester fibers. For example, the melting point of the sheath component can be 100-180°C, for example, 130-170°C, for example, 100°C, 120°C, 150°C or 180°C; the melting point of the core component is 240-280°C, for example, 260°C.

[0254] In some embodiments of the present application, the mass ratio of the aramid fiber to the binder fiber is ≥5:1, for example, ≥5:1, ≥5.5:1, ≥6:1, ≥6.5:1, ≥7:1, ≥7.5:1, ≥8:1, ≥8.5:1, ≥9:1, ≥9.5:1, ≥10:1, ≥10.5:1, ≥11:1, ≥12:1, ≥13:1, ≥14:1, ≥15:1.

[0255] In some embodiments of the present application, the obtained core material for vacuum insulated panels can also be cut to become the desired shape and size.

[0256] The present application also provides a core material for vacuum insulated panels prepared according to the method for preparing a core material for vacuum insulated panels.

[0257] In some embodiments of the present application, the present application provides a method for preparing a vacuum insulated panel, comprising the following steps:

[0258] (1) The aramid fiber is carded by a carding machine to obtain a non-strength fiber mat; optionally, according to the desired basis weight of the fiber non-woven fabric, different thicknesses of non-strength fiber mats can be selected for lamination;

[0259] (2) The fiber mat is obtained by needle punching process or water jet process to obtain a fiber non-woven fabric, and the fiber non-woven fabric is laminated to obtain the core material for vacuum insulated panels; in addition, the obtained core material for vacuum insulated panels can also be cut to become the desired shape and size;

[0260] (3) The vacuum insulation board is heat treated with a core material, then sealed with a barrier film material, and vacuumized to obtain the vacuum insulation board. Specifically, the vacuum insulation board core material can be placed in a bag of barrier film material, sealed and vacuumized using a vacuum high-temperature sealing machine, and sealed after the vacuum degree reaches the target vacuum degree.

[0261] For the purpose of explanation rather than limitation, step (1) belongs to carding, which further disperses, mixes evenly, and uses the interaction between the paired roller surface needle cloth to separate the specific specification aramid fiber mass used in this application into single fibers that are interlaced with each other, and forms a uniform fiber network using its own curling and friction. The fiber network has low strength and can be used as a laminate of the core material of the vacuum insulation board.

[0262] For the purpose of explanation rather than limitation, in combination with the fourth aspect, the needle punching process in step (2) belongs to needle punching. The specific specification aramid fiber used in this application is a crimped short fiber. After being carded by a carding machine to form a uniform fiber web, the fiber web is cross-laid to reach the target grammage, and then needle punched by a needle punching machine. The needles of the needle punching machine have hooks that repeatedly pierce the fiber web to reinforce the fibers and form a needle-punched non-woven fabric. The non-woven fabric has no warp and weft, and the fibers are randomly arranged, with little difference between the warp and weft performance.

[0263] For the purpose of explanation rather than limitation, the hydroentanglement process in step (2) belongs to hydroentanglement. The specific specification aramid fiber used in this application is a crimped short fiber. After being carded by a carding machine to form a uniform fiber web, the fiber web is cross-laid to reach the target grammage, and then hydroentangled by a hydroentanglement machine. The hydroentanglement non-woven process uses high-pressure water jets to produce a hydraulic effect, causing the arranged fibers to surge, displace, and rearrange, and entangle with each other. The fiber web is reinforced and has certain physical and mechanical properties under this action.

[0264] The needle punching ratio or hydroentanglement ratio in step (2) can be appropriately reduced, and a balance is struck between strength and needle punching ratio or hydroentanglement ratio. The needle punching ratio is 10% to 80%, for example 15% to 65%, for example 20% to 50%. The hydroentanglement ratio is 10% to 80%, for example 15% to 65%, for example 20% to 50%. For the purpose of explanation rather than limitation, the needle punching ratio is the number of needles (number of needles and frequency of needle insertion) that can be adjusted on the same area of non-woven fabric. It can be understood that this machine should have 100 needles in the same area, and only 40 needles are inserted by adjusting the frequency of needle insertion and the forward speed of the non-woven fabric.

[0265] Needle punching or hydroentanglement is to penetrate a certain fiber on the upper layer through the entire non-woven fabric or about half the thickness, thereby improving the strength of the non-woven fabric.

[0266] Alternatively, in some embodiments of the present application, the present application also provides a method for preparing a vacuum insulation panel, comprising the following steps:

[0267] (1) aramid fibers, adhesive fibers are combed by a carding machine to obtain a non-strength fiber felt; optionally, different thicknesses of non-strength fiber felt can be selected according to the desired fiber non-woven fabric grammage;

[0268] (2) The fiber felt is obtained by a hot pressing process to obtain a fiber non-woven fabric, and the fiber non-woven fabric is stacked to obtain the core material of the vacuum insulation panel; in addition, the obtained core material of the vacuum insulation panel can be cut to a desired shape and size;

[0269] (3) The core material of the vacuum insulation panel is heat treated, then wrapped with a barrier film, and then vacuumized to obtain the vacuum insulation panel. Specifically, the core material of the vacuum insulation panel can be placed in a bag of barrier film, wrapped and vacuumized using a vacuum heat sealing machine, and then sealed after the vacuum degree reaches the target vacuum degree.

[0270] For the purpose of explanation rather than limitation, the hot pressing process in step (2) belongs to the hot pressing method, and the specific specification of aramid fiber used in the present application is crimped staple fiber, which is pre-mixed with low-melting adhesive fibers (such as polypropylene fibers or polyester fibers, etc.) in proportion through a coarse opening process, and then further mixed through a fine opening process, then combed by a carding machine to form a uniform fiber web, then cross-laminated to the target grammage, and then hot-rolled to melt the low-melting fibers, and then cooled to form a non-woven fabric with strength.

[0271] In some embodiments of the present application, the adhesive fiber includes at least one of a single-component polyester fiber, a single-component polyethylene fiber, a single-component polyvinyl alcohol fiber, a single-component polypropylene fiber, a double-component sheath-core structure polyester fiber, a double-component sheath-core structure polyethylene fiber, a double-component polyethylene-polyester fiber, and a double-component polypropylene-polyester fiber. For the purpose of explanation rather than limitation, the term "double component" used herein refers to a sheath-core structure, the sheath and the core are different components, for example, both are polyester, and are also different melting point polyesters, so it is called double component. As an example, the double-component polyethylene-polyester fiber has a polyethylene sheath component and a polyester core component. As an example, the double-component polypropylene-polyester fiber has a polypropylene sheath component and a polyester core component. As an example, the double-component sheath-core structure polyester fiber has a sheath component and a core component that are different melting point polyester fibers. For example, the melting point of the sheath component can be 100°C to 180°C, for example, 130°C to 170°C, for example, 100°C, 120°C, 150°C, or 180°C; the melting point of the core component is 240°C to 280°C, for example, 260°C.

[0272] In some embodiments of the present application, the mass ratio of the aramid fiber to the binder fiber is ≥ 5:1, for example, ≥ 5:1, ≥ 5.5:1, ≥ 6:1, ≥ 6.5:1, ≥ 7:1, ≥ 7.5:1, ≥ 8:1, ≥ 8.5:1, ≥ 9:1, ≥ 9.5:1, ≥ 10:1, ≥ 10.5:1, ≥ 11:1, ≥ 12:1, ≥ 13:1, ≥ 14:1, ≥ 15:1.

[0273] The description of the temperature and time of the heat treatment can refer to the description of the previous embodiments, which will not be repeated here.

[0274] The present application also provides a vacuum heat insulating panel prepared according to the method for preparing a vacuum heat insulating panel.

[0275] In some embodiments of the present application, the present application provides an insulation device, which comprises the above-mentioned core material for a vacuum heat insulating panel or the above-mentioned vacuum heat insulating panel.

[0276] In some embodiments of the present application, the insulation device is a refrigerator. The above-mentioned core material for a vacuum heat insulating panel or the above-mentioned vacuum heat insulating panel can be used in the insulation component of the refrigerator, thereby achieving the effect of insulation.

[0277] In some embodiments of the present application, the insulation device is a thermal insulation box. The above-mentioned core material for a vacuum heat insulating panel or the above-mentioned vacuum heat insulating panel can be used in the insulation component of the thermal insulation box, thereby achieving the effect of insulation.

[0278] In some embodiments of the present application, the insulation device is a water heater. The above-mentioned core material for a vacuum heat insulating panel or the above-mentioned vacuum heat insulating panel can be used in the insulation component of the water heater, thereby achieving the effect of insulation.

[0279] In some embodiments of the present application, the insulation device is a microwave oven. The above-mentioned core material for a vacuum heat insulating panel or the above-mentioned vacuum heat insulating panel can be used in the insulation component of the microwave oven, thereby achieving the effect of insulation.

[0280] In some embodiments of the present application, the insulation device is a container. The above-mentioned core material for a vacuum heat insulating panel or the above-mentioned vacuum heat insulating panel can be used in the insulation component of the container (for example, a refrigerated container, a cold chain transport container), thereby achieving the effect of insulation.

[0281] In some embodiments of the present application, the insulation device is a building wallboard. The above-mentioned core material for a vacuum heat insulating panel or the above-mentioned vacuum heat insulating panel can be used in the insulation component of the building wallboard (for example, a residential wall, etc.), thereby achieving the effect of insulation.

[0282] In some embodiments of the present application, the heat insulation device is a cold storage. The use of the above-mentioned core material of the vacuum thermal insulation panel or the above-mentioned vacuum thermal insulation panel in the heat insulation component of the cold storage can achieve the heat insulation effect.

[0283] It can be understood that the vacuum thermal insulation panel of the present application uses a specific specification of aramid fiber, has a high porosity, a better thermal conductivity, and a lighter texture, and can achieve a good heat insulation effect. In the process of preparing the vacuum thermal insulation panel, and in the process of cutting and processing the core material of the vacuum thermal insulation panel, no dust and fine fibers are generated, and there is no environmental pollution and health risk.

[0284] The technical solutions of the present application will be better understood in combination with the specific embodiments below.

[0285] Example 7

[0286] In this embodiment, a core material of a vacuum thermal insulation panel and a vacuum thermal insulation panel are prepared.

[0287] The specific preparation method is as follows:

[0288] (1) Take poly-m-phenylene isophthalamide fibers with a fineness of 2.0 dtex and a length of 51 mm, and pass them through a carding machine at a speed ratio of 1:25 between the working roller and the cylinder. After passing through the fiber carding machine, a uniform double-layer fibrous thin layer of 16 g / m 2 2 is obtained. After three times of thin layer stacking and cross-laying, a 45-60 g / m 2 2 stacked layer is obtained.

[0289] (2) Then, the stacked layer is placed on a needle punching machine, and pre-needling reinforcement is performed, and then further main needle punching reinforcement is performed, so as to finally obtain aramid fiber non-woven fabric with a needle punching ratio of 40% and a grammage of 49.3 g / m 2 2. The non-woven fabric is stacked to obtain the core material of the vacuum thermal insulation panel.

[0290] (3) The core material is cut to the target size, and grooves for placing the getter and the desiccant are cut out. The core material is placed in a 210°C oven and baked for 3 hours. The getter (1 g) and the desiccant (4 g) are placed in the grooves, and then placed in a bag of barrier film material, and then placed in a vacuum sealing machine for packaging, to obtain a vacuum thermal insulation panel with a thickness of 9.1 mm.

[0291] Example 8

[0292] In this embodiment, a core material of a vacuum thermal insulation panel and a vacuum thermal insulation panel are prepared.

[0293] The specific preparation method is as follows:

[0294] (1) Take the poly-m-phenylene isophthalamide fiber with fineness of 2.0 dtex and length of 38 mm, and card it through a carding machine, the speed ratio of the working roller to the cylinder of the carding machine is 1:25, and after the fiber carding machine carding, a uniform 16 g / m 2 of double-layer fibrous thin layer is obtained, and after three times of thin layer stacking and cross lapping, a 45-60 g / m 2 of stack is obtained;

[0295] (2) Then, the stack is placed on a needle punching machine, and pre-needling reinforcement is carried out first, and then main needle punching reinforcement is further carried out, and finally, the aramid fiber non-woven fabric with a needle punching ratio of 40% and a grammage of 49.8 g / m 2 is obtained, the non-woven fabric is stacked, and the core material for the vacuum heat insulation board is obtained;

[0296] (3) The core material is cut to the target size, and a groove for placing the getter and the desiccant is cut out at the same time. The core material is placed in a 210°C oven and baked for 3 hours. The getter (1g) and the desiccant (4g) are placed in the groove, and then placed in a bag of barrier film material, and then placed in a vacuum sealing machine for packaging, and a 9.1mm thick vacuum heat insulation board is obtained.

[0297] Example 9

[0298] A core material for a vacuum heat insulation board and a vacuum heat insulation board are prepared in this example.

[0299] The specific preparation method is as follows:

[0300] (1) Take the poly-m-phenylene isophthalamide fiber with fineness of 2.0 dtex and length of 76 mm, and card it through a carding machine, the speed ratio of the working roller to the cylinder of the carding machine is 1:25, and after the fiber carding machine carding, a uniform 16 g / m 2 of double-layer fibrous thin layer is obtained, and after three times of thin layer stacking and cross lapping, a 45-60 g / m 2 of stack is obtained;

[0301] (2) Then, the stack is placed on a needle punching machine, and pre-needling reinforcement is carried out first, and then main needle punching reinforcement is further carried out, and finally, the aramid fiber non-woven fabric with a needle punching ratio of 40% and a grammage of 49.8 g / m 2 is obtained, the non-woven fabric is stacked, and the core material for the vacuum heat insulation board is obtained;

[0302] (3) The core material is cut to the target size, and a groove for placing the getter and the desiccant is cut out at the same time. The core material is placed in a 210°C oven and baked for 3 hours. The getter (1g) and the desiccant (4g) are placed in the groove, and then placed in a bag of barrier film material, and then placed in a vacuum sealing machine for packaging, and a 9.1mm thick vacuum heat insulation board is obtained.

[0303] Example 10

[0304] A core material for a vacuum adiabatic panel and a vacuum adiabatic panel were prepared.

[0305] The specific preparation method is as follows:

[0306] (1) Take poly-m-phenylene isophthalamide fibers with a fineness of 2.0 dtex and a length of 51 mm, and card them through a carding machine, with a speed ratio of the working roller to the cylinder of 1:25. After carding through the fiber carding machine, a uniform 16 g / m 2 of double-layer fibrous thin layers are obtained, and after three times of thin layer stacking and cross-laying, a 45-60 g / m 2 of stacked layers is obtained.

[0307] (2) Then, the stacked layers are placed on a hydroentangling machine, and the stacked layers pass through the hydroentangling machine in sequence through 7 hydroentangling heads, with the hydroentangling pressures of the 7 hydroentangling heads being 10-15 kg / cm 2 , 20-30 kg / cm 2 , 35-40 kg / cm 2 , 40-45 kg / cm 2 , 30-35 kg / cm 2 , 70-80 kg / cm 2 , and 40-45 kg / cm 2 , respectively. The wet nonwoven fabric after hydroentangling needs to be dried in two steps; the first step is cylinder drying, and the surface of the hydroentangled nonwoven fabric is dried, with the drying temperature being increased in steps from 100-120 °C; the second step is box-type through-drying, with the drying temperature being 140-150 °C. Finally, a para-aramid fiber nonwoven fabric with a grammage of 49.5 g / m 2 is obtained, and the nonwoven fabric is stacked to obtain the core material for the vacuum adiabatic panel;

[0308] (3) The core material is cut to the target size, and grooves for placing the getter and the desiccant are cut out at the same time. The core material is placed in a 210 °C oven, baked for 3 hours, and then taken out. The getter (1 g) and the desiccant (4 g) are placed in the grooves, and then placed in a bag of barrier film material, and placed in a vacuum sealing machine for packaging, to obtain a 9.0 mm thick vacuum adiabatic panel.

[0309] Example 11

[0310] A core material for a vacuum adiabatic panel and a vacuum adiabatic panel were prepared.

[0311] The specific preparation method is as follows:

[0312] (1) Take the poly-m-phenylene isophthalamide fiber with fineness of 2.5 dtex and length of 38 mm, and card it through a carding machine, the speed ratio of the working roller to the cylinder of the carding machine is 1:25, and after the fiber carding machine carding, a uniform 16 g / m 2 of double-layer fibrous thin layer is obtained, and after three times of thin layer stacking and cross lapping, a 45-60 g / m 2 of stack is obtained;

[0313] (2) Then, the stack is placed on a needle punching machine, and pre-needling reinforcement is carried out first, and then further main needle punching reinforcement is carried out, and finally, an aramid fiber non-woven fabric with a needle punching ratio of 40% and a grammage of 49.3 g / m 2 is obtained, and the non-woven fabric is stacked to obtain the core material for the vacuum heat insulation board;

[0314] (3) The core material is cut to the target size, and a groove for placing the getter and the desiccant is cut out at the same time. The core material is placed in a 210°C oven and baked for 3 hours. The getter (1.5 g) and the desiccant (5 g) are placed in the groove, and then placed in a bag of barrier film material, and then placed in a vacuum sealing machine for packaging, to obtain a 9.0 mm thick vacuum heat insulation board.

[0315] Example 12

[0316] A core material for a vacuum heat insulation board and a vacuum heat insulation board are prepared in this example.

[0317] The specific preparation method is as follows:

[0318] (1) Take the poly-m-phenylene isophthalamide fiber with fineness of 1.5 dtex and length of 76 mm, and card it through a carding machine, the speed ratio of the working roller to the cylinder of the carding machine is 1:25, and after the fiber carding machine carding, a uniform 16 g / m 2 of double-layer fibrous thin layer is obtained, and after three times of thin layer stacking and cross lapping, a 45-60 g / m 2 of stack is obtained;

[0319] (2) Then, the stack is placed on a needle punching machine, and pre-needling reinforcement is carried out first, and then further main needle punching reinforcement is carried out, and finally, an aramid fiber non-woven fabric with a needle punching ratio of 40% and a grammage of 49.5 g / m 2 is obtained, and the non-woven fabric is stacked to obtain the core material for the vacuum heat insulation board;

[0320] (3) The core material is cut to the target size, and a groove for placing the getter and desiccant is cut out. The core material is placed in a 210°C oven and baked for 3 hours. The getter (1.5g) and desiccant (6g) are placed in the groove, and then placed in a bag of barrier film material, and placed in a vacuum sealing machine for packaging, to obtain a 9.0mm thick vacuum insulation board.

[0321] Comparative Example 3

[0322] This comparative example uses commercially available glass fiber mat to make a 9mm thick glass fiber core material vacuum insulation board.

[0323] Comparative Example 4

[0324] This comparative example uses poly-m-phenylene isophthalamide fibers with a length of 18mm, and the rest of the process is the same as Example 7.

[0325] Comparative Example 5

[0326] This comparative example uses poly-m-phenylene isophthalamide fibers with a length of 270mm, and the rest of the process is the same as Example 7.

[0327] The properties of the products prepared in each example and comparative example are shown in Table 2 below.

[0328] Table 2

[0329] The thermal conductivity is measured according to the national standard GB / T 10294 / 10295 using the steady-state heat flow method. The strength of the carded fiber mat is judged by the actual use effect.

[0330] As can be seen from Table 2, the vacuum insulation board prepared in the present application has a more optimal thermal conductivity. Under the same conditions, the thermal conductivity of the vacuum insulation board prepared by Comparative Example 3 using glass fiber is significantly worse than the present application.

[0331] The poly-m-phenylene isophthalamide fibers used in Comparative Example 4 are too short, and the bonding force between the fibers during carding is poor, resulting in poor strength and uniformity of the carded fiber mat, which cannot be effectively produced and is not suitable for the dry process of the present application.

[0332] The poly-m-phenylene isophthalamide fibers used in Comparative Example 5 are too long, and the thermal conductivity increases.

[0333] The above describes the present application in detail in combination with examples, but the present application is not limited to the above examples, and various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the purpose of the present application. Industrial applicability

[0334] The vacuum insulation board of the embodiment of the present application has good heat preservation and insulation performance, can be widely applied to the fields of heat preservation and insulation such as refrigerator heat preservation, residence heat preservation, cold storage heat preservation, heat preservation and insulation box heat preservation, water heater heat preservation, microwave oven heat insulation, and has industrial practicability.

Claims

1. A core material for a vacuum insulation panel, comprising aramid fibers and a binder material, wherein the aramid fibers comprise at least one of poly-m-phenylene isophthamide fibers, poly-p-phenylene terephthamide fibers, and heterocyclic aramid fibers; and the aramid fibers have a length of 1 mm to 10 mm.

2. The core material for a vacuum insulation panel according to claim 1, wherein, The aramid fibers have a fineness of 0.2 dtex to 5 dtex.

3. The core material for a vacuum insulation panel according to claim 1 or 2, wherein, The vacuum insulation board core material has a density of 100 g / cm 3 to 300 g / cm 3 .

4. The core material for a vacuum insulation panel according to any one of claims 1 to 3, wherein, The core material for a vacuum insulation panel has a porosity of 60% to 95%.

5. The core material for a vacuum insulation panel according to any one of claims 1 to 4, wherein, The binder material comprises at least one of binder fibers and a binder.

6. The core material for a vacuum insulation panel according to claim 5, wherein, The binder fibers comprise at least one of monocomponent polyester fibers, monocomponent polyethylene fibers, monocomponent polyvinyl alcohol fibers, monocomponent polypropylene fibers, bicomponent sheath-core structure polyester fibers, bicomponent sheath-core structure polyethylene fibers, bicomponent polyethylene-polyester fibers, and bicomponent polypropylene-polyester fibers.

7. The core material for a vacuum insulation panel according to claim 5 or 6, wherein, The binder comprises at least one of polyacrylate, polyurethane, epoxy resin, and starch hydrogel.

8. The core material for a vacuum insulation panel according to any one of claims 1 to 7, wherein, The mass fraction of the binder material is ≤ 35% based on the mass of the aramid fibers. 9.A vacuum insulation panel, comprising the core material for a vacuum insulation panel according to any one of claims 1 to 8 and a barrier film material, wherein the barrier film material encloses the core material for a vacuum insulation panel. 10.The vacuum insulation panel according to claim 9, further comprising at least one of a desiccant and a getter, wherein the barrier film material encloses the core material for a vacuum insulation panel and the at least one of a desiccant and a getter.

11. Vacuum insulation panel according to claim 10, wherein The desiccant comprises at least one of calcium carbonate, calcium sulfate, calcium oxide, calcium chloride, magnesium chloride, and barium oxide.

12. Vacuum thermal panel according to claim 10 or 11, wherein, The getter comprises at least one of barium-lithium alloy getter, palladium oxide getter, and activated carbon getter.

13. Vacuum thermal panel according to any of claims 9 to 12, wherein, The vacuum insulation panel has a thickness of at least 8 mm.

14. Vacuum thermal panel according to any of claims 9 to 13, wherein, The vacuum insulation board has a vacuum degree of 1 x 10 -4 Pa to 1 x 10 -3 Pa. 15.A method for preparing the core material for a vacuum insulation panel according to any one of claims 1 to 8, comprising the following steps: (1) dispersing aramid fibers and a binder material into water to obtain a fiber dispersion; and (2) performing a wet process, and drying to obtain the core material for a vacuum insulation panel. 16.A method for preparing the core material for a vacuum insulation panel according to any one of claims 1 to 8, comprising the following steps: (1) dispersing aramid fibers into water to obtain a fiber dispersion; and (2) performing a wet process, and then applying a binder material, and drying to obtain the core material for a vacuum insulation panel.

17. A core material for a vacuum insulation panel, comprising a fiber nonwoven fabric made of aramid fibers, wherein, The aramid fibers comprise at least one of poly-m-phenylene isophthamide fibers, poly-p-phenylene terephthamide fibers, and heterocyclic aramid fibers, and have a length of 25 mm to 250 mm.

18. The core material for a vacuum insulation panel according to claim 17, wherein, The aramid fibers have a fineness of 0.5 dtex to 5 dtex.

19. The core material for a vacuum insulation panel according to claim 17 or 18, wherein, The vacuum insulation board core material has a density of 100 g / cm 3 to 300 g / cm 3 .

20. The core material for a vacuum insulation panel according to any one of claims 17 to 19, wherein, The fiber nonwoven fabric has a grammage of 10 g / m 2 to 150 g / m 2 . 21.A vacuum insulation panel, comprising the core material for a vacuum insulation panel according to any one of claims 17 to 20 and a barrier film material, wherein the barrier film material encloses the core material for a vacuum insulation panel. 22.A method for preparing the core material for a vacuum insulation panel according to any one of claims 17 to 20, comprising the following steps: (1) carding aramid fibers by a carding machine to obtain a fiber mat; and (2) the fiber mat is subjected to a needle punching process or a hydro-entangling process to obtain a fiber nonwoven fabric, and the fiber nonwoven fabric is subjected to lamination to obtain the core material for the vacuum insulation panel.

23. A method for preparing the core material for the vacuum insulation panel according to any one of claims 17 to 20, comprising the following steps: (1) aramid fibers and binder fibers are subjected to carding by a carding machine to obtain a fiber mat; and (2) the fiber mat is subjected to a hot-pressing process to obtain a fiber nonwoven fabric, and the fiber nonwoven fabric is subjected to lamination to obtain the core material for the vacuum insulation panel.

24. The method of claim 23, wherein, The binder fibers include at least one of a single-component polyester fiber, a single-component polyethylene fiber, a single-component polyvinyl alcohol fiber, a single-component polypropylene fiber, a double-component sheath-core structure polyester fiber, a double-component sheath-core structure polyethylene fiber, a double-component polyethylene-polyester fiber, and a double-component polypropylene-polyester fiber.

25. The method of claim 23 or 24, wherein, The mass ratio of the aramid fibers to the binder fibers is ≥ 5:

1.

26. A method for preparing the vacuum insulation panel according to any one of claims 9 to 14 and 21, comprising the following steps: The core material for the vacuum insulation panel is subjected to heat treatment, and then is wrapped with a barrier film material and is subjected to vacuumization to obtain the vacuum insulation panel.

27. The method of claim 26, wherein, The temperature of the heat treatment is 90°C to 300°C.

28. The method of claim 26 or 27, wherein, The time of the heat treatment is 1 hour to 36 hours.

29. The method of any one of claims 26-28, wherein, The core material for the vacuum insulation panel is prepared by the method according to any one of claims 15, 16, 22, and 23.

30. A thermal insulation device, comprising the core material for the vacuum insulation panel according to any one of claims 1 to 8 or any one of claims 17 to 20 or the vacuum insulation panel according to any one of claims 9 to 14 or claim 21; and the thermal insulation device includes a refrigerator, a thermal insulation box, a water heater, a microwave oven, a container, and a building wallboard.

Images