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

Abstract

The invention provides a core material for a vacuum insulation panel, the vacuum insulation panel and a preparation method and application of the vacuum insulation panel. The core material for the vacuum insulation panel comprises a fiber non-woven fabric made of aramid fibers, and the aramid fibers comprise at least one of poly (m-phenylene isophthalamide) fibers, poly (p-phenylene terephthalamide) fibers and heterocyclic aramid fibers; the length of the aramid fiber ranges from 25 mm to 250 mm. The vacuum insulation panel comprises a core material for the vacuum insulation panel and a barrier film material, and the barrier film material wraps the core material for the vacuum insulation panel. In the process of preparing the vacuum insulated panel and the process of cutting and producing the core material for the vacuum insulated panel, dust and fine fibers are not generated, and environmental pollution and health risks are avoided.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of functional materials, and particularly relates to a core material for a vacuum insulation panel, a vacuum insulation panel, and a preparation method and application thereof. BACKGROUND

[0002] In household appliances with refrigeration or heating functions (for example, refrigerators), it is generally necessary to use thermal insulation materials. Traditional thermal insulation materials, such as polyurethane rigid foam materials (or rigid polyurethane 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 consumption requirements, the current thermal insulation materials are increasingly difficult to meet the higher design and energy consumption requirements. Vacuum insulation panels (VIPs) have good thermal insulation performance and can replace a portion of polyurethane rigid foam materials, thereby reducing energy consumption and increasing the usable volume.

[0003] A vacuum insulation panel is composed of a general core material, a barrier film material, a getter, and a desiccant. The core material, the getter, and the desiccant are placed in a bag of the barrier film material, vacuumized, and then heat-sealed to obtain a vacuum insulation panel.

[0004] The core material of the 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 the vacuum insulation panel must have a very high porosity, can be well vacuumized, and has a certain structural strength. The barrier film material of the 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, it is generally necessary to add a getter and a desiccant to improve the performance of the vacuum insulation panel and prolong its service life.

[0005] The core material for a vacuum insulation panel prepared using glass fibers (for example, artificial 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 of thermal insulation equipment, and have become the mainstream material in the market.

[0006] However, glass fiber still has some big shortcomings. First, glass fiber is very hard and brittle. Using glass fiber in the production of core material in the process needs to be cut off, which can cause a large amount of glass fiber dust to adhere to the skin and mucous membrane and cause strong irritation. The World Health Organization (WTO) and the International Agency for Research on Cancer (IARC) classify man-made glass fiber (Man-Made Vitreous Fiber) as a possible carcinogen in the carcinogenic risk level. The European Union has also introduced regulations to prohibit glass fiber-containing products from entering the European market. The glass fiber industry is a high-energy consumption and high-pollution industry, and is restricted or even eliminated in the world. The location of its production plant is also strictly limited.

[0007] The vacuum insulation board 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 cell size. Moreover, the foam is a whole, and the contact heat transfer ratio is high, which makes it difficult to achieve a thermal conductivity of less than 6.0 mW / (m·K). The vacuum insulation board with powder such as aerogel as the core material has more contact points between powder particles under low vacuum, and the contact heat transfer is high, with a thermal conductivity of 4 mW / (m·K) to 6 mW / (m·K). They cannot meet the demand for large capacity and low energy consumption of thermal insulation equipment.

[0008] Therefore, it is still necessary to develop a new core material for vacuum insulation board and a vacuum insulation board. SUMMARY

[0009] The present application aims to at least solve one of the above technical problems in the prior art. To this end, the present application provides a core material for a vacuum insulation board, which has better thermal insulation performance than a vacuum insulation board with a glass fiber core material when made into a vacuum insulation board. Moreover, the core material for the vacuum insulation board of the present application does not produce pollution in the production process and can meet the stringent legal and regulatory requirements of the European Union and other regions.

[0010] The present application also provides a vacuum insulation board.

[0011] The present application also provides a method for preparing a core material for a vacuum insulation board, which belongs to a dry process.

[0012] The present application also provides a method for preparing a vacuum insulation board, which belongs to a dry process.

[0013] The present application also provides a thermal insulation device.

[0014] The first aspect of the present application provides a core material for a vacuum insulation panel, the core material for a vacuum insulation panel comprising a fiber non-woven fabric made of aramid fibers, 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 25 mm to 250 mm.

[0015] According to the technical solution of the core material for a vacuum insulation panel of the present application, at least the following beneficial effects are achieved:

[0016] The core material for a vacuum insulation panel of the present application can form gaps between the aramid fibers during the process of the present application, and the core material for a vacuum insulation panel has a high porosity, which can achieve a good heat insulation effect. The aramid fibers have a light texture and a relatively low thermal conductivity, which can meet the requirements of large capacity and low energy consumption of a heat insulation device.

[0017] The core material for a vacuum insulation panel of the present application has a thermal conductivity of only 130 mW / (m·K), which is one-tenth of the thermal conductivity of glass fibers (the thermal conductivity of glass fibers is 800-1500 mW / (m·K)), and has a high heat insulation performance itself.

[0018] The aramid fibers used in the core material for a vacuum insulation panel of the present application have a higher high strength than glass fibers due to the benzene ring structure containing conjugated double bonds in the main chain of the macromolecule. After being made into a core material, the core material has a structure similar to that of a glass fiber core material, the fibers are in point contact with each other, the contact heat transfer is greatly reduced, and the air permeability is as high as 6000 to 7000 L / m 2 / s, has a high porosity, and is easy to be vacuumized to prepare a vacuum insulation panel.

[0019] The aramid fibers used in the core material for a vacuum insulation panel of the present application have flexibility, and no dust and fine fibers are generated during cutting and production of the core material, which does not cause environmental pollution and health risks, and meets the regulatory requirements in the European Union and other regions.

[0020] According to some embodiments of the present application, the aramid fibers comprise poly-m-phenylene isophthalamide fibers.

[0021] According to some embodiments of the present application, the aramid fibers have a fineness of 0.5 dtex to 5 dtex.

[0022] According to some embodiments of the present application, the core material for a vacuum insulation panel has a density of 100 g / cm 3 to 300 g / cm 3 .

[0023] According to some embodiments of the present application, the porosity of the core material of the vacuum insulation panel is 75% to 95%.

[0024] The core material of the vacuum insulation panel of the present application has a high porosity, can be well vacuumed, and has a certain strength, and has good heat insulation performance.

[0025] According to some embodiments of the present application, the basis weight of the fibrous nonwoven fabric is 10 g / m 2 to 150 g / m 2 .

[0026] According to some embodiments of the present application, the fibrous nonwoven fabric is laminated, and the number of laminations is at least 2. Specifically, for example, the number of laminations is 2, 3, 4, 5, 6, or more.

[0027] The second aspect of the present application provides a vacuum insulation panel, which comprises the above-mentioned core material for vacuum insulation panel and a barrier film material, and the barrier film material encloses the core material for vacuum insulation panel.

[0028] The present application has at least the following beneficial effects:

[0029] The vacuum insulation panel of the present application has a low thermal conductivity, and the performance exceeds that of a vacuum insulation panel with a glass fiber core material. Therefore, the vacuum insulation panel of the present application has better heat insulation performance than a vacuum insulation panel based on a glass fiber core material, and the core material does not pollute the production process, and can be widely used in the fields of heat insulation, such as refrigerator insulation, residential insulation, cold storage insulation, heat insulation box insulation, water heater insulation, microwave oven insulation, etc.

[0030] According to 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. As an example, the core material for vacuum insulation panel is cut to form a groove, and the size of the groove is suitable for accommodating the desiccant and / or the getter. The desiccant and / or the getter is placed in the groove, and the core material for vacuum insulation panel, the desiccant and / or the getter are enclosed by the barrier film material, and then vacuumized and sealed.

[0031] According to some embodiments of the present application, the desiccant comprises at least one of calcium carbonate, calcium sulfate, calcium oxide, calcium chloride, magnesium chloride, and barium oxide.

[0032] According to some embodiments of the present application, the getter comprises at least one of a barium-lithium alloy getter, a palladium oxide getter, and an activated carbon getter.

[0033] The present application relates to a kind of implementation of the technical solution of desiccant and / or getter, at least with the following beneficial effects: residual gas, moisture in the core material of vacuum insulation panel is generally not removed completely by vacuumizing, residual gas, moisture in the vacuum insulation panel can be removed using desiccant and / or getter, and the vacuum degree and the gas-free, moisture-free state in the vacuum insulation panel are maintained for a relatively long period of time.

[0034] According to some embodiments of the present application, the thickness of the vacuum insulation panel is at least 8 mm.

[0035] According to some embodiments of the present application, the vacuum degree inside the vacuum insulation panel is 1x10 -4 Pa to 1x10 -3 Pa.

[0036] According to some embodiments of the present application, the thermal conductivity of the vacuum insulation panel is ≤1.50 mW / (m·K).

[0037] The third aspect of the present application provides a method for preparing a core material for a vacuum insulation panel, comprising the following steps:

[0038] (1) aramid fibers are carded by a carding machine to obtain a fiber mat;

[0039] (2) the fiber mat is obtained by needle punching process or hydroentangling 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.

[0040] Alternatively, the present application also provides a method for preparing a core material for a vacuum insulation panel, comprising the following steps:

[0041] (1) aramid fibers and binder fibers are carded by a carding machine to obtain a fiber mat;

[0042] (2) the fiber mat is obtained by 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.

[0043] The present application relates to a kind of implementation of the technical solution of core material for vacuum insulation panel, at least with the following beneficial effects:

[0044] The binder fiber of the present application can make the aramid fiber easy to operate during production and operation, and improve production efficiency.

[0045] In combination with the third aspect, the fiber non-woven fabric is laminated, and the number of laminations is at least 2. Specifically, for example, the number of laminations is 2, 3, 4, 5, 6, or more.

[0046] The present application relates to a technical solution of a method for preparing a core material for a vacuum insulation panel, and at least has the following beneficial effects:

[0047] The present application does not produce dust and fine fibers in the process of preparing the core material for the vacuum insulation panel, and in the process of cutting and processing and producing the core material for the vacuum insulation panel, and has no environmental pollution and health risks, and meets the regulatory requirements of the European Union and other regions.

[0048] The fourth aspect of the present application provides a method for preparing the above-mentioned vacuum insulation panel, comprising the following steps:

[0049] (1) aramid fibers are carded by a carding machine to obtain a fiber felt;

[0050] (2) the fiber felt is obtained by a needle punching process or a hydroentangling process to obtain a fiber non-woven fabric, and the fiber non-woven fabric is stacked to obtain the core material for the vacuum insulation panel;

[0051] (3) the core material for the vacuum insulation panel is heat treated, then wrapped with a barrier film material, and vacuumized to obtain the vacuum insulation panel.

[0052] Alternatively, the present application also provides a method for preparing the above-mentioned vacuum insulation panel, comprising the following steps:

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

[0054] (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 for the vacuum insulation panel;

[0055] (3) the core material for the vacuum insulation panel is heat treated, then wrapped with a barrier film material, and vacuumized to obtain the vacuum insulation panel.

[0056] In combination with the fourth aspect, the fiber non-woven fabric is stacked, and the number of layers is at least 2. Specifically, for example, the number of layers is 2, 3, 4, 5, 6, or more.

[0057] The present application relates to a technical solution of a method for preparing a vacuum insulation panel, and at least has the following beneficial effects:

[0058] The present application does not produce dust and fine fibers in the process of preparing the vacuum insulation panel, and has no environmental pollution and health risks, and meets the regulatory requirements of the European Union and other regions.

[0059] According to 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.

[0060] According to some embodiments of the present application, the mass ratio of the aramid fiber to the binder fiber is ≥ 5:1.

[0061] According to some embodiments of the present application, the temperature of the heat treatment is 90℃ to 300℃, and the time of the heat treatment is 1 hour to 36 hours.

[0062] The present application uses aramid fibers of a specific specification in combination with a dry process to obtain a core material for a vacuum insulation panel and a vacuum insulation panel with a better thermal conductivity, a lighter texture, a good heat insulation effect, safety and no pollution, wherein the length of the aramid fiber is 25mm to 250mm. For the purpose of explanation but not limitation, if the length of the aramid fiber is too short, the bonding force between the fibers will be poor during carding, resulting in poor non-woven fabric strength and uniformity, which cannot be effectively produced and is not suitable for the dry process of the present application. In addition, too long aramid fibers will result in poor thermal conductivity.

[0063] A fifth aspect of the present application provides a heat insulation device, which comprises the above-mentioned core material for a vacuum insulation panel or a vacuum insulation panel; the heat insulation device comprises a refrigerator, an insulation box, a water heater, a microwave oven, a container, and a building wallboard.

[0064] According to one embodiment of the technical scheme of the heat insulation device of the present application, at least the following beneficial effects are achieved:

[0065] The heat insulation device of the present application has very low thermal conductivity and high heat insulation performance. No dust and fine fibers are generated during production, there is no environmental pollution and health risk, and it meets the regulatory requirements of the European Union and other regions. BRIEF DESCRIPTION OF DRAWINGS

[0066] Figure 1 is a structural schematic diagram of the vacuum insulation panel of the present application.

[0067] REFERENCE NUMERALS:

[0068] 1: Core material for a vacuum insulation panel;

[0069] 2: Barrier film material;

[0070] 3: Desiccant and getter. DETAILED DESCRIPTION

[0071] The concept and the technical effects of the present application will be described clearly and completely in combination with the embodiments. It is obvious that 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 protection scope of the present application.

[0072] In the description of the present application, if 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, within, 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.

[0073] 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.

[0074] Unless otherwise indicated herein, or in the context of a particular situation, all methods described herein can be performed in any suitable order to achieve the desired results.

[0075] 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 claimed. No language in the specification should be construed as indicating any non-claimed element as essential to the practice of the application.

[0076] Unless otherwise noted, all experiments provided herein were carried out in accordance with conventional procedures or manufacturer's specifications.

[0077] In a first aspect, some embodiments of the present application provide 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-p-phenylene terephthalamide fibers, heterocyclic aramid fibers; the length of the aramid fibers being 25 mm to 250 mm.

[0078] For the purpose of explanation and not limitation, the term "aramid fiber" as used herein refers to aramid fiber. The term "poly-m-phenylene isophthalamide fiber" as used herein can be used interchangeably with "meta-aramid". The term "poly-para-phenylene terephthalamide fiber" as used herein can be used interchangeably with "para-aramid". The term "heterocyclic aramid" as used herein is co-polymerized from three monomers, p-phenylenediamine, terephthaloyl chloride and a diamine containing a heterocyclic ring, which can be used interchangeably with "Aramid III".

[0079] In some embodiments of the first aspect, the aramid fiber comprises poly-m-phenylene isophthalamide fiber.

[0080] In some embodiments of the first aspect, the aramid fiber consists of poly-m-phenylene isophthalamide fiber.

[0081] Without wishing to be bound by theory, the applicant has surprisingly found that a certain specification of aramid fiber, in particular poly-m-phenylene isophthalamide fiber, produces a core material for a vacuum insulated panel that has good thermal insulation properties. Amongst various different materials for a vacuum insulated panel, the vacuum insulated panel of the present application outperforms a vacuum insulated panel with a core material of glass fiber.

[0082] In some embodiments of the first aspect, the length of the aramid fiber is 25mm to 250mm. Specifically, the length of the aramid fiber is, for example, 25mm, 26mm, 27mm, 28mm, 29mm, 30mm, 31mm, 32mm, 33mm, 34mm, 35mm, 36mm, 37mm, 38mm, 39mm, 40mm, 50mm, 60mm, 61mm, 62mm, 63mm, 64mm, 65mm, 66mm, 67mm, 68mm, 69mm, 70mm, 71mm, 72mm, 73mm, 74mm, 75mm, 76mm, 77mm, 78mm, 79mm, 80mm, 81mm, 82mm, 83mm, 84mm, 85mm, 86mm, 87mm, 88mm, 89mm, 90mm, 91mm, 92mm, 93mm, 94mm, 95mm, 100mm, 110mm, 120mm, 130mm, 140mm, 150mm, 160mm, 170mm, 180mm, 190mm, 200mm, 210mm, 220mm, 230mm, 240mm, 250mm.

[0083] In some embodiments of the first aspect, the length of the aramid fiber is 25mm to 150mm.

[0084] In some embodiments of the first aspect, the aramid fiber has a length of 38 mm to 100 mm.

[0085] In some embodiments of the first aspect, 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.

[0086] In some embodiments of the first aspect, the aramid fiber has a fineness of 1 dtex to 3 dtex.

[0087] In some embodiments of the first aspect, the aramid fiber has a fineness of 1.5 dtex to 2.5 dtex.

[0088] In some embodiments of the first aspect, the core material for the vacuum insulation 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 / cm3 , 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 .

[0089] In some embodiments of the first aspect, the core material for the vacuum insulation panel has a porosity of 75% to 95%. Specifically, the core material for the vacuum insulation panel has a porosity of, for example, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, or 95%.

[0090] In some embodiments of the first aspect, the core material for the vacuum insulation panel has a porosity of 80% to 90%.

[0091] In some embodiments of the first aspect, the core material for the vacuum insulation panel has a porosity of 84% to 90%.

[0092] In some embodiments of the first aspect, the fiber nonwoven fabric has a grammage of 10 g / m 2 to 150 g / m 2 . Specifically, the fiber nonwoven fabric has a grammage of, 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 / m2 , 32 g / m 2 , 33 g / m 2 , 34 g / m 2 , 35 g / m 2 , 36 g / m 2 , 37 g / m 2 , 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 / m2 .

[0093] In some embodiments of the first aspect, the fiber nonwoven fabric has a grammage of 10 g / m 2 to 100 g / m 2 .

[0094] In some embodiments of the first aspect, the fiber nonwoven fabric has a grammage of 10 g / m 2 to 60 g / m 2 .

[0095] In some embodiments of the second aspect, the vacuum insulation panel further comprises a desiccant and / or a getter, and the barrier film material encloses the vacuum insulation panel core material, the desiccant and / or the getter.

[0096] In some embodiments of the second aspect, the vacuum insulation panel further comprises a desiccant and / or a getter, and the barrier film material encloses the vacuum insulation panel core material, the desiccant and / or the getter.

[0097] As an example, the vacuum insulation panel further comprises a desiccant, and the barrier film material encloses the vacuum insulation panel core material and the desiccant. 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, based on each vacuum insulation panel. As an example, the vacuum insulation panel core material is cut to form a recess, and the recess is suitable for accommodating the desiccant. The desiccant is placed in the recess, and the vacuum insulation panel core material and the desiccant are enclosed by the barrier film material, and the vacuum insulation panel is sealed after being vacuumized.

[0098] As an example, the vacuum insulation panel further comprises a getter, and the barrier film material encloses the vacuum insulation panel core material and the getter. 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, based on each vacuum insulation panel. As an example, the vacuum insulation panel core material is cut to form a recess, and the recess is suitable for accommodating the getter. The getter is placed in the recess, and the vacuum insulation panel core material and the getter are enclosed by the barrier film material, and the vacuum insulation panel is sealed after being vacuumized.

[0099] As an example, the vacuum insulation panel further comprises a desiccant and a getter, and the barrier film material encloses the vacuum insulation panel with the core material, the desiccant and the getter. As an example, the mass ratio of the desiccant and 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 barrier film material is used to enclose the vacuum insulation panel with the core material, the desiccant and the getter, and the desiccant and the getter can be placed at the same location. As an example, the core material of the vacuum insulation panel is cut to form a recess, and the recess is suitable for accommodating the desiccant and the getter. The desiccant and the getter are both placed in the recess, and the barrier film material is used to enclose the vacuum insulation panel with the core material, the desiccant and the getter, and the vacuum is extracted and sealed.

[0100] Reference Figure 1 As shown, it can be understood that, in some embodiments of the present application, the barrier film material 2 is used to enclose the core material 1 of the vacuum insulation panel and the desiccant and the getter 3.

[0101] As an example, based on each vacuum insulation panel (weight, for example, about 1 kg to 3 kg, for example 2 kg), 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 and the getter is (2 to 6) : 1, for example 2:1, 3:1, 4:1, 5:1, or 6:1.

[0102] In combination with the second aspect, in some embodiments of the present application, the desiccant comprises at least one of calcium carbonate, calcium sulfate, calcium oxide, calcium chloride, magnesium chloride, and barium oxide. As an example, the desiccant is calcium carbonate.

[0103] In combination with the second aspect, in some embodiments of the present application, the getter comprises at least one of a barium-lithium alloy getter, a palladium oxide getter, and an activated carbon getter. As an example, the getter is a barium-lithium alloy getter.

[0104] In some embodiments of the second aspect, the vacuum insulation panel has a thickness of at least 8 mm, such as 8 mm to 30 mm, 8 mm to 10 mm. In particular, the vacuum insulation panel has a thickness of 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.

[0105] In some embodiments of the second aspect, the vacuum degree inside the vacuum insulation panel is 1 x 10 - 4 Pa to 1 x 10 -3 Pa. In particular, 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.

[0106] In some embodiments of the second aspect, the vacuum insulation panel has a thermal conductivity of < 1.50 mW / (m K). In particular, the vacuum insulation panel has a thermal conductivity of < 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).

[0107] In the third aspect, some embodiments of the present application provide a method for preparing a core material for a vacuum insulation panel, comprising the following steps:

[0108] (1) The aramid fiber is carded by a carding machine to obtain a fiber mat without strength; optionally, according to the desired fiber non-woven fabric grammage, the non-strength fiber mat of different thicknesses can be selected for lamination;

[0109] (2) The fiber mat is obtained by a needle punching process or a 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 to the desired shape and size.

[0110] For the purpose of explanation rather than limitation, in combination with the third aspect, step (1) belongs to the carding method, and the specific specification of aramid fiber used in the present application is further dispersed, mixed uniformly, and separated into interlaced single fibers by 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 laminate for the core material of the vacuum insulation panel.

[0111] For the purpose of explanation rather than limitation, in combination with the third aspect, the needle punching process in step (2) belongs to the needle punching method, and the specific specification of aramid fiber used in the present application is crimped short fiber. After the carding machine is carded to form a uniform fiber network, the fiber network is cross-laminated to the target grammage, and then the needle punching machine is used for needle punching. The needle of the needle punching machine has a hook, which repeatedly pierces the fiber network to hook the fiber and reinforce it, forming 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.

[0112] For the purpose of explanation rather than limitation, in combination with the third aspect, the water jet process in step (2) belongs to the water jet method, and the specific specification of aramid fiber used in the present application is crimped short fiber. After the carding machine is carded to form a uniform fiber network, the fiber network is cross-laminated to the target grammage, and then the water jet machine is used for water jetting. The water jet non-woven process produces a hydraulic effect by continuous jetting of high-pressure water flow, making the arranged fibers surge, displace, and rearrange, and intertangle with each other. The fiber network is reinforced and has certain physical and mechanical properties under this action.

[0113] In combination with the third aspect, the needle punching ratio or water jet ratio in step (2) can be appropriately reduced, and a balance is made between the strength and the needle punching ratio or water jet ratio. The needle punching ratio is 10% to 80%, for example, 15% to 65%, for example, 20% to 50%. The water jet ratio is 10% to 80%, for example, 15% to 65%, for example, 20% to 50%.

[0114] Alternatively, in the third aspect, some embodiments of the present application also provide a method for preparing a core material for a vacuum insulation panel, comprising the following steps:

[0115] (1) The aramid fiber and the binding fiber are carded by a carding machine to obtain a non-strength fiber mat; optionally, according to the desired fiber non-woven fabric grammage, different thicknesses of non-strength fiber mats can be selected for lamination;

[0116] (2) The fiber mat 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.

[0117] For the purpose of explanation rather than limitation, in combination with the third aspect, the hot pressing process in step (2) belongs to the hot pressing method, the specific specification of aramid fiber used in the present application is crimped staple fiber, which is pre-mixed with low-melting-point binding fiber (such as polypropylene fiber or polyester fiber, etc.) in proportion through a coarse opening process, and then further opened and mixed through a fine opening process, and then formed into a uniform fiber web through a carding machine, and then laminated to the target grammage, and then the low-melting-point fiber is melted through hot pressing and hot rolling, and then cooled to form a non-woven fabric with strength.

[0118] In combination with the third aspect, in some embodiments of the present application, the binding 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, 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℃ to 180℃, for example, 130℃ to 170℃, for example, 100℃, 120℃, 150℃ or 180℃; the melting point of the core component is 240℃ to 280℃, for example, 260℃.

[0119] In combination with the third aspect, in some embodiments of the present application, the mass ratio of the aramid fiber to the binding 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.

[0120] In some embodiments of the third aspect, the obtained core material for vacuum insulated panels can be cut into a desired shape and size.

[0121] In some embodiments of the third aspect, the application further provides a core material for vacuum insulated panels prepared according to the method for preparing a core material for vacuum insulated panels.

[0122] In the fourth aspect, the application provides a method for preparing a vacuum insulated panel, comprising the following steps:

[0123] (1) aramid fibers are carded by a carding machine to obtain a non-strength fiber felt; optionally, according to the desired basis weight of the fiber non-woven fabric, non-strength fiber felts of different thicknesses can be selected;

[0124] (2) the fiber felt is obtained by a needle punching process or a hydroentangling 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 be cut into a desired shape and size;

[0125] (3) the core material for vacuum insulated panels is heat treated, then wrapped with a barrier film material, and vacuumized to obtain the vacuum insulated panel. Specifically, the core material for vacuum insulated panels can be placed in a bag of barrier film material, wrapped and vacuumized using a vacuum heat sealing machine, and sealed after the vacuum degree reaches the target vacuum degree.

[0126] For the purpose of explanation rather than limitation, in connection with the fourth aspect, step (1) is a carding method, the specific specification of aramid fibers used in the application is further dispersed, mixed uniformly, and separated into interlaced single fibers by the interaction between the surfaces of the paired rollers, 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 vacuum insulated panels.

[0127] For the purpose of explanation rather than limitation, in connection with the fourth aspect, the needle punching process in step (2) is a needle punching method, the specific specification of aramid fibers used in the application is crimped short fibers, which are uniformly formed into a fiber network after carding by a carding machine, and then are cross-laminated to reach the target basis weight, and are needle punched by a needle punching machine. The needles of the needle punching machine have hooks, repeatedly penetrate the fiber network, hook the fibers, and form a needle punched non-woven fabric. The non-woven fabric has no warp and weft, the fibers are disordered, and the performance of the warp and weft has little difference.

[0128] For the purpose of explanation and not limitation, in connection with the fourth aspect, the hydroentanglement process in step (2) belongs to hydroentanglement, the specific specification of aramid fiber used in this application is crimped staple fiber, after being carded by a carding machine to form a uniform fiber web, the fiber web is cross-laid to reach the target gram weight, and then the fiber web is hydroentangled by a hydroentangling machine. The hydroentanglement nonwoven process produces a hydraulic effect by continuous spraying of high-pressure water flow, causing the arranged fibers to surge, displace, and rearrange, and intertwine with each other. The fiber web is reinforced under this action and has certain physical and mechanical properties.

[0129] In connection with the fourth aspect, the needle punching ratio or the hydroentanglement ratio in step (2) can be appropriately reduced, and a balance is made between the strength and the needle punching ratio or the 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 and not limitation, the needle punching ratio is the number of needles that can be adjusted (the number of needles and the frequency of needle insertion) on the same area of nonwoven 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 nonwoven fabric.

[0130] The needle punching or hydroentanglement is to penetrate a certain fiber in the upper layer through the entire nonwoven fabric or about half the thickness, thereby improving the strength of the nonwoven fabric by intercalation.

[0131] Alternatively, in some embodiments of the fourth aspect, the application also provides a method for preparing a vacuum insulation panel, comprising the following steps:

[0132] (1) aramid fibers and binder fibers are carded by a carding machine to obtain a non-strength fiber mat; optionally, different thicknesses of non-strength fiber mats can be selected according to the desired gram weight of the fiber nonwoven fabric;

[0133] (2) the fiber mat is subjected to a hot pressing process to obtain a fiber nonwoven fabric, and the fiber nonwoven 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;

[0134] (3) the core material for the vacuum insulation panel is subjected to a heat treatment, and then is packaged with a barrier film material and vacuumized to obtain the vacuum insulation panel. Specifically, the core material for the vacuum insulation panel can be placed in a bag of barrier film material, and a vacuum heat sealing machine is used for packaging and vacuumizing. After the vacuum degree reaches the target vacuum degree, the bag is sealed.

[0135] For the purpose of explanation and not limitation, in connection with the fourth aspect, the hot pressing process in step (2) belongs to the hot pressing method, the specific specification of aramid fiber used in the present application is crimped staple fiber, which is pre-mixed with low-melting point binder fiber (such as polypropylene fiber or polyester fiber, etc.) in proportion through a coarse opening process, and then further opened and mixed through a fine opening process, and then combed into a uniform fiber web through a carding machine, and then cross-laid to the target gram weight, and then the low-melting point fiber is melted through hot pressing and hot rolling, and then cooled to form a non-woven fabric with strength.

[0136] In connection with the fourth aspect, in some embodiments of the present application, the binder 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 and 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, so it is called double component. As an example, the double-component polyethylene-polyester fiber, the sheath component is polyethylene, and the core component is polyester fiber. As an example, the double-component polypropylene-polyester fiber, the sheath component is polypropylene, and the core component is 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℃ to 180℃, for example, 130℃ to 170℃, for example, 100℃, 120℃, 150℃ or 180℃; the melting point of the core component is 240℃ to 280℃, for example, 260℃.

[0137] In connection with the fourth aspect, 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.

[0138] In connection with the fourth aspect, 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℃.

[0139] In connection with the fourth aspect, in some embodiments of the present application, the temperature of the heat treatment is 120℃ to 250℃.

[0140] In some embodiments of the fourth aspect, the heat treatment is performed at a temperature of 150°C to 230°C.

[0141] In some embodiments of the fourth aspect, the heat treatment is performed for a time period of 1 hour to 36 hours. Specifically, the heat treatment is performed for a time period of 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, or 36 hours.

[0142] In some embodiments of the fourth aspect, the heat treatment is performed for a time period of 1.5 hours to 12 hours.

[0143] In some embodiments of the fourth aspect, the heat treatment is performed for a time period of 1.5 hours to 8 hours.

[0144] As an example, the heat treatment is performed at a temperature of 90°C to 300°C for a time period of 1 hour to 36 hours. As an example, the heat treatment is performed at a temperature of 120°C to 250°C for a time period of 1.5 hours to 12 hours. As an example, the heat treatment is performed at a temperature of 150°C to 230°C for a time period of 1.5 hours to 8 hours.

[0145] In some embodiments of the fourth aspect, the present application also provides a vacuum insulation panel prepared according to the method for preparing a vacuum insulation panel.

[0146] In the fifth aspect, in some embodiments of the present application, the present application provides an insulation device, which comprises the above-mentioned core material for a vacuum insulation panel or the above-mentioned vacuum insulation panel.

[0147] In some embodiments of the fifth aspect, the 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 insulation part of the refrigerator, thereby achieving the effect of insulation.

[0148] In some embodiments of the fifth aspect, the insulation device is an insulation box. The above-mentioned core material for a vacuum insulation panel or the above-mentioned vacuum insulation panel can be used in the insulation part of the insulation box, thereby achieving the effect of insulation.

[0149] In combination with the fifth aspect, in some embodiments of the present application, the heat insulation device is a water heater. The use of the above-mentioned core material of the vacuum insulation board or the above-mentioned vacuum insulation board in the heat insulation component of the water heater can achieve the heat insulation effect.

[0150] In combination with the fifth aspect, in some embodiments of the present application, the heat insulation device is a microwave oven. The use of the above-mentioned core material of the vacuum insulation board or the above-mentioned vacuum insulation board in the heat insulation component of the microwave oven can achieve the heat insulation effect.

[0151] In combination with the fifth aspect, in some embodiments of the present application, the heat insulation device is a container. The use of the above-mentioned core material of the vacuum insulation board or the above-mentioned vacuum insulation board in the heat insulation component of the container (such as a refrigerated container, a cold chain transport container) can achieve the heat insulation effect.

[0152] In combination with the fifth aspect, in some embodiments of the present application, the heat insulation device is a building wallboard. The use of the above-mentioned core material of the vacuum insulation board or the above-mentioned vacuum insulation board in the heat insulation component of the building wallboard (such as a residential wall, etc.) can achieve the heat insulation effect.

[0153] In combination with the fifth aspect, 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 insulation board or the above-mentioned vacuum insulation board in the heat insulation component of the cold storage can achieve the heat insulation effect.

[0154] It can be understood that the vacuum insulation board of the present application uses a specific specification of aramid fiber, has a higher porosity, a better thermal conductivity, and a lighter texture, and can achieve a good heat insulation effect. The present application does not produce dust and fine fibers in the process of preparing the vacuum insulation board and cutting and producing the core material of the vacuum insulation board, and has no environmental pollution and health risk.

[0155] The technical solutions of the present application will be better understood in combination with the specific embodiments below.

[0156] Embodiment 1

[0157] In this embodiment, a core material of a vacuum insulation board and a vacuum insulation board are prepared.

[0158] The specific preparation method is as follows:

[0159] (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 16 g / m 2 of double-layer fibrous thin layer is obtained, and after three times of thin layer stacking and cross-laying, 45-60 g / m 2The stacking;

[0160] (2) The laminate is then placed on a needle punching machine for pre-needling reinforcement and then further main needling reinforcement, ultimately obtaining a needling ratio of 40% and a gram weight of 49.3 g / m 2 Aramid fiber non-woven fabrics are stacked to obtain the core material for the vacuum insulation panel;

[0161] (3) Cut the core material to the target size and cut grooves for the getter and desiccant. Place the core material in a 210°C oven and bake for 3 hours. Place the getter (1g) and desiccant (4g) in the grooves, then place them in a bag of barrier film. Place the bag in a vacuum sealer for packaging to obtain a 9.1mm thick vacuum insulation panel.

[0162] Example 2

[0163] In this embodiment, a core material for a vacuum insulation panel and a vacuum insulation panel are prepared.

[0164] The specific preparation method is as follows:

[0165] (1) Take the polyisophthalamide (m-phenylene isophthalamide) fiber with a fineness of 2.0 dtex and a length of 38 mm, and comb it through a carding machine. The speed ratio of the carding machine working roller to the cylinder is 1:25. After the fiber carding machine is combed, a uniform 16 g / m 2 The double-layer fibrous thin layer is stacked and cross-stacked three times to obtain 45-60g / m 2 The stacking;

[0166] (2) The laminate is then placed on a needle punching machine for pre-needling reinforcement and then further main needling reinforcement, ultimately obtaining a needling ratio of 40% and a gram weight of 49.8 g / m 2 Aramid fiber non-woven fabrics are stacked to obtain the core material for the vacuum insulation panel;

[0167] (3) Cut the core material to the target size and cut grooves for the getter and desiccant. Place the core material in a 210°C oven and bake for 3 hours. Place the getter (1g) and desiccant (4g) in the grooves, then place them in a bag of barrier film. Place the bag in a vacuum sealer for packaging to obtain a 9.1mm thick vacuum insulation panel.

[0168] Example 3

[0169] In this embodiment, a core material for a vacuum insulation panel and a vacuum insulation panel are prepared.

[0170] The specific preparation method is as follows:

[0171] (1) Take the polyisophthalamide (m-phenylene isophthalamide) fiber with a fineness of 2.0 dtex and a length of 76 mm, and comb it through a carding machine. The speed ratio of the carding machine working roller to the cylinder is 1:25. After the fiber carding machine is combed, a uniform 16 g / m 2 The double-layer fibrous thin layer is stacked and cross-stacked three times to obtain 45-60g / m 2 The stacking;

[0172] (2) The laminate is then placed on a needle punching machine for pre-needling reinforcement and then further main needling reinforcement, ultimately obtaining a needling ratio of 40% and a gram weight of 48.5 g / m 2 Aramid fiber non-woven fabrics are stacked to obtain the core material for the vacuum insulation panel;

[0173] (3) Cut the core material to the target size and cut grooves for the getter and desiccant. Place the core material in a 210°C oven and bake for 3 hours. Place the getter (1g) and desiccant (4g) in the grooves, then place them in a bag of barrier film. Place the bag in a vacuum sealer for packaging to obtain a 9.1mm thick vacuum insulation panel.

[0174] Example 4

[0175] In this embodiment, a core material for a vacuum insulation panel and a vacuum insulation panel are prepared.

[0176] The specific preparation method is as follows:

[0177] (1) Take the polyisophthalamide (m-phenylene isophthalamide) fiber with a fineness of 2.0 dtex and a length of 51 mm, and comb it through a carding machine. The speed ratio of the carding machine working roller to the cylinder is 1:25. After the fiber carding machine is combed, a uniform 16 g / m 2 The double-layer fibrous thin layer is stacked and cross-stacked three times to obtain 45-60g / m 2 The stacking;

[0178] (2) The laminate is then placed on a hydroentanglement machine. The laminate passes through the hydroentanglement machine and passes through 7 hydroentanglement heads in sequence. The hydroentanglement pressure of the 7 hydroentanglement heads is 10-15 kg / cm 2 , 20-30kg / cm 2 、35-40kg / cm 2 , 40-45kg / cm 2 、30-35kg / cm 2 , 70-80kg / cm 2 , 40-45kg / cm 2The wet nonwoven fabric after water jet needs to be dried, which is divided into two steps; the first step is cylinder drying, which is surface drying for the water jet nonwoven fabric, and the drying temperature is gradiently heated from 100-120℃; the second step is box type penetration drying, and the drying temperature is 140-150℃. Finally, the aramid fiber nonwoven fabric with a grammage of 49.5g / m 2 The nonwoven fabric is stacked to obtain the core material for the vacuum heat insulation board;

[0179] (3) The core material is cut to the target size, and the grooves for placing the getter and the desiccant are cut out at the same time. The core material is placed in a 210℃ oven and baked for 3 hours. The getter (1g) and the desiccant (4g) are placed in the grooves, and then placed in a bag of barrier film material and sealed in a vacuum sealing machine to obtain a 9.0mm thick vacuum heat insulation board.

[0180] Example 5

[0181] A core material for a vacuum heat insulation board and a vacuum heat insulation board are prepared in this example.

[0182] The specific preparation method is as follows:

[0183] (1) Take poly-m-phenylene isophthalamide fibers with a fineness of 2.5dtex and a length of 38mm, and pass them through a carding machine with a working roller to tin speed ratio of 1:25. After passing through the fiber carding machine, a uniform double-layer fibrous thin layer of 16g / m 2 is obtained. After three times of thin layer stacking and cross-laying, a 45-60g / m 2 stacking is obtained.

[0184] (2) Then the stacking is placed on a needle punching machine, and pre-needling reinforcement is carried out first, and then main needle punching reinforcement is carried out, so that a aramid fiber nonwoven fabric with a needle punching ratio of 40% and a grammage of 49.3g / m 2 is finally obtained. The nonwoven fabric is stacked to obtain the core material for the vacuum heat insulation board;

[0185] (3) The core material is cut to the target size, and the grooves for placing the getter and the desiccant are cut out at the same time. The core material is placed in a 210℃ oven and baked for 3 hours. The getter (1.5g) and the desiccant (5g) are placed in the grooves, and then placed in a bag of barrier film material and sealed in a vacuum sealing machine to obtain a 9.0mm thick vacuum heat insulation board.

[0186] Example 6

[0187] A core material for a vacuum heat insulation board and a vacuum heat insulation board are prepared in this example.

[0188] The specific preparation method is as follows:

[0189] (1) Take poly-m-phenylene isophthalamide fibers with a fineness of 1.5 dtex and a length of 76 mm, and card them through a carding machine with a ratio of working roller to cylinder speed of 1:25. After carding through the fiber carding machine, a uniform 16 g / m 2 of double-layer fibrous thin layers is obtained. After three times of thin layer cross-lamination and cross-webbing, a 45-60 g / m 2 laminated layer is obtained.

[0190] (2) Then, the laminated layer is placed on a needle punching machine, and pre-needling reinforcement is performed, followed by further main needle punching reinforcement, so that an aramid fiber nonwoven fabric with a needle punching ratio of 40% and a grammage of 49.5 g / m 2 is finally obtained. The nonwoven fabric is stacked to obtain the core material for the vacuum heat insulating panel;

[0191] (3) The core material is cut to the target size, and grooves for placing the getter and the desiccant are cut 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 (6 g) are placed in the grooves, and then placed in a bag of barrier film material and sealed in a vacuum sealing machine to obtain a 9.0 mm thick vacuum heat insulating panel.

[0192] Comparative Example 1

[0193] In this comparative example, a commercially available glass fiber mat is used to make a 9 mm thick glass fiber core material vacuum heat insulating panel.

[0194] Comparative Example 2

[0195] In this comparative example, poly-m-phenylene isophthalamide fibers with a length of 18 mm are used, and the rest of the process is the same as in Example 1.

[0196] Comparative Example 3

[0197] In this comparative example, poly-m-phenylene isophthalamide fibers with a length of 270 mm are used, and the rest of the process is the same as in Example 1.

[0198] The properties of the products prepared in each of the examples and comparative examples are shown in Table 1 below.

[0199] Table 1

[0200]

[0201]

[0202] 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.

[0203] As can be seen from Table 1, the vacuum insulation board prepared by the present application has a better thermal conductivity. Under the same conditions, the thermal conductivity of the vacuum insulation board prepared by the glass fiber of Comparative Example 1 is obviously poorer than that of the present application.

[0204] The poly-m-phenylene isophthalamide fiber used in Comparative Example 2 is too short, and the binding force between fibers is poor during carding, 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.

[0205] The poly-m-phenylene isophthalamide fiber used in Comparative Example 3 is too long, and the thermal conductivity is increased.

[0206] The present application has been described in detail above in combination with the 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 spirit of the present application.

[0207] Industrial applicability

[0208] The vacuum insulation board of the present application has good heat preservation and insulation performance, and can be widely used in the fields of heat preservation and insulation such as refrigerator heat preservation, residential heat preservation, cold storage heat preservation, heat preservation and insulation box heat preservation, water heater heat preservation, microwave oven heat insulation, etc., and has industrial applicability.

Claims

1. A core material for a vacuum insulation panel, characterized by, The core material for the vacuum insulation board comprises a fiber nonwoven fabric made of aramid fibers, the aramid fibers comprising at least one of poly-m-phenylene isophthalamide fibers, poly-p-phenylene terephthalamide fibers, and heterocyclic aramid fibers; the length of the aramid fibers being 25 mm to 250 mm.

2. The core material for a vacuum insulation panel according to claim 1, characterized by The fineness of the aramid fibers is 0.5 dtex to 5 dtex.

3. The core material for a vacuum insulation panel according to claim 1, characterized by The density of the core material for the vacuum insulation panel is 100 g / cm 3 to 300 g / cm 3 .

4. The core material for a vacuum insulation panel according to claim 1, wherein The porosity of the core material for the vacuum insulation board is 75% to 95%.

5. The core material for a vacuum insulation panel according to claim 1, wherein The fiber nonwoven fabric has a grammage of 10 g / m 2 up to 150 g / m 2 .

6. A vacuum insulation panel, characterized in that, The vacuum insulation board comprises the core material for the vacuum insulation board according to any one of claims 1 to 5 and a barrier film material, the barrier film material enclosing the core material for the vacuum insulation board.

7. A vacuum insulation panel according to claim 6, characterised in that, The vacuum insulation board further comprises a desiccant and / or a getter, and the barrier film material encloses the core material for the vacuum insulation board, the desiccant, and / or the getter.

8. A vacuum insulation panel according to claim 7, characterised in that, The desiccant comprises at least one of calcium carbonate, calcium sulfate, calcium oxide, calcium chloride, magnesium chloride, and barium oxide.

9. A vacuum insulation panel according to claim 7, characterised in that, The getter comprises at least one of a barium-lithium alloy getter, a palladium oxide getter, and an activated carbon getter.

10. The vacuum insulation panel of claim 6, wherein, The thickness of the vacuum insulation board is at least 8 mm.

11. A vacuum insulation panel according to claim 6, characterised in that The vacuum degree inside the vacuum insulation board is 1 x 10 -4 Pa to 1 x 10 -3 Pa.

12. A method of producing a core material for a vacuum insulation panel as defined in any one of claims 1 to 5, characterized by, The method comprises the following steps: (1) carding aramid fibers through a carding machine to obtain a fiber felt; (2) obtaining a fiber nonwoven fabric through needle punching or hydroentangling of the fiber felt, and obtaining the core material for the vacuum insulation board by stacking the fiber nonwoven fabric.

13. A method of producing a core material for a vacuum insulation panel as defined in any one of claims 1 to 5, characterized by, The method comprises the following steps: (1) carding aramid fibers and binder fibers through a carding machine to obtain a fiber felt; (2) obtaining a fiber nonwoven fabric through hot pressing of the fiber felt, and obtaining the core material for the vacuum insulation board by stacking the fiber nonwoven fabric.

14. The method of claim 13, wherein, The binder fibers comprise 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, and double-component polypropylene-polyester fibers.

15. The method of claim 13, wherein, The mass ratio of the aramid fibers to the binder fibers is ≥ 5:

1.

16. A method of manufacturing a vacuum insulation panel according to any one of claims 6 to 11, characterised in that, The method comprises the following steps: The core material for the vacuum insulation board is subjected to heat treatment, and then is enclosed by a barrier film material and vacuumized to obtain the vacuum insulation board.

17. The method of claim 16, wherein, The temperature of the heat treatment is 90°C to 300°C, and / or the time of the heat treatment is 1 hour to 36 hours.

18. The method according to claim 16 or 17, characterized in that The core material for the vacuum insulation board is prepared by the method according to any one of claims 12 to 15.

19. A thermal insulation device, characterized in that The thermal insulation device comprises the core material for the vacuum insulation board according to any one of claims 1 to 5 or the vacuum insulation board according to any one of claims 6 to 11; and the thermal insulation device comprises a refrigerator, a thermal insulation box, a water heater, a microwave oven, a container, and a building wallboard.

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