Degradable organic fiber core material VIP board and preparation method and application thereof

Abstract

The application belongs to the field of vacuum thermal insulation materials, and specifically discloses a degradable organic fiber core material VIP plate and a preparation method and application thereof. The thermal insulation core material is prepared from raw materials including degradable composite organic fibers. The raw materials of the degradable composite organic fibers include a base polymer and a degradable polymer material. The base polymer includes at least one of polyacrylonitrile, polyamide, polyester, polypropylene or polyethylene. The thermal insulation core material has excellent degradability, a very low thermal conductivity, excellent thermal insulation performance, and a low density, and has a good market application prospect. The application also provides a preparation method of the thermal insulation core material and a vacuum thermal insulation plate.

Description

Technical Field

[0001] This invention relates to the field of vacuum insulation materials technology, and in particular to a biodegradable organic fiber core material VIP board, its preparation method and application. Background Technology

[0002] Vacuum insulation panels (VIP panels) have excellent thermal insulation properties and are increasingly advantageous in the application of thermal insulation equipment such as refrigeration or freezing systems. The structure of a VIP panel generally includes: a main core material, a getter / desiccant, and an outer packaging film. Among these, the core material is the core material of the vacuum insulation panel, and its material, structure, and composition have a crucial impact on the thermal conductivity of the vacuum insulation panel.

[0003] Currently, the most widely used VIP core material in the market is glass fiber (such as synthetic glass fiber), which has high porosity and low thermal conductivity. Glass fiber also offers advantages such as high temperature resistance, fire resistance, and low cost. Glass fiber can effectively meet the requirements of low energy consumption and high volume in thermal insulation equipment. However, glass fiber as a VIP core material still has some significant drawbacks. First, the production process of glass fiber core material requires cutting, resulting in a large amount of glass fiber dust. This dust easily adheres to human skin and mucous membranes, causing strong irritation and harming health. Second, glass fiber is difficult to degrade, easily causing environmental problems. The glass fiber industry is a high-energy-consuming and high-polluting industry, and the location of its production plants is strictly restricted. Furthermore, the thermal conductivity of glass fiber is difficult to further reduce.

[0004] Therefore, it is necessary to improve the materials used in VIP core materials to prepare VIP boards with better thermal insulation performance and environmental friendliness. Summary of the Invention

[0005] This invention aims to address at least one of the technical problems existing in the prior art. To this end, this invention provides an insulating core material and a vacuum insulation panel (VIP panel), aiming to solve the problems of commonly used materials for vacuum insulation panels, such as glass fiber, being harmful to human health and the environment, and failing to meet higher design and energy consumption requirements. Through optimization of material selection, structural design, and manufacturing processes, this invention overcomes the difficulties of cost, environmental harm, and the inability to achieve ultra-low thermal conductivity, resulting in a biodegradable insulating core material with low density and a vacuum insulation panel with extremely low thermal conductivity.

[0006] An embodiment of the first aspect of the present invention provides a thermal insulation core material, wherein the raw materials for preparing the thermal insulation core material include biodegradable composite organic fibers;

[0007] The raw materials for preparing the biodegradable composite organic fiber include a matrix polymer and biodegradable polymer materials;

[0008] The matrix polymer includes at least one of polyacrylonitrile (PAN), polyamide (PA), polyester (PET), polypropylene (PP), or polyethylene (PE).

[0009] The thermal insulation core material of the first aspect of the present invention has at least the following beneficial effects:

[0010] The thermal insulation core material of this invention is used as a vacuum thermal insulation core material. It is prepared by combining a matrix polymer with a biodegradable polymer material to create biodegradable composite organic fibers. This gives the thermal insulation core material good biodegradability, and the high rigidity of the organic fiber material provides support for the three-dimensional network structure of the VIP core material. Heat transfer takes place in the three-dimensional network structure of the fiber, which can make full use of the low intrinsic thermal conductivity of the organic fibers, reduce the thermal conductivity of the thermal insulation core material and the prepared vacuum insulation board, and improve the thermal insulation performance.

[0011] The VIP core material of this invention also has a lower density, which allows the VIP board to maintain excellent thermal insulation performance while having a lighter weight, significantly reducing the overall weight of the product, facilitating transportation and installation, and further enhancing the application flexibility and market competitiveness of the product.

[0012] Furthermore, the raw materials used in the preparation of the VIP core material of this invention are all environmentally friendly and meet strict environmental standards. These materials do not cause pollution to the environment during production, use, or disposal, and pose no harm to human health. More importantly, the use of these environmentally friendly materials does not increase production costs; on the contrary, it effectively controls the production costs of the VIP core material and VIP board of this invention, resulting in a high cost-performance ratio and providing strong support for the widespread application of the product.

[0013] In some embodiments of the present invention, the biodegradable polymeric material includes at least one of polylactic acid (PLA), polybutylene adipate terephthalate (PBAT), cellulose (CE), chitosan (CS), polycaprolactone (PCL), polyvinyl alcohol (PVA), polyhydroxyalkanoates (PHA), and polybutylene succinate (PBS).

[0014] The biodegradable composite organic fiber used in the preparation of the VIP core material of this invention can be selected from widely available organic polymers. Both the matrix polymer and the biodegradable polymer material are mature products produced using existing mature processes. Compared with the glass fiber commonly used in traditional VIP panels, the organic fiber used in this invention avoids the potential health hazards of glass fiber dust during production, processing, and use, thus improving the safety of the product during production and use. The use of the biodegradable composite organic fiber of this invention not only further enhances the thermal insulation performance of the VIP core material but also provides a more environmentally friendly and sustainable raw material option for the preparation of the VIP core material, further expanding the application scope and market prospects of VIP panels.

[0015] In some embodiments of the present invention, the raw materials for preparing the biodegradable composite organic fiber further include compatibilizers and / or antioxidants.

[0016] This invention also uses compatibilizers and antioxidants in the raw materials for preparing biodegradable composite organic fibers to improve the preparation efficiency. The use of compatibilizers improves the compatibility between the components of the biodegradable composite organic fibers and also helps to enhance their biodegradability in the natural environment. The use of antioxidants can improve the antioxidant properties and stability of the biodegradable composite organic fibers during use, preventing aging during their normal service life.

[0017] In some embodiments of the present invention, the matrix polymer accounts for 30% to 70% of the mass fraction of the biodegradable composite organic fiber; and / or, the biodegradable polymer material accounts for 25% to 75% of the mass fraction of the biodegradable composite organic fiber.

[0018] In some embodiments of the present invention, the compatibilizer accounts for 1% to 5% of the mass fraction of the biodegradable composite organic fiber; and / or, the antioxidant accounts for 1% to 5% of the mass fraction of the biodegradable composite organic fiber.

[0019] The present invention optimizes the proportions of raw materials used in the preparation of VIP core materials. By precisely adjusting the proportions of each raw material component, not only is the internal structure of the material optimized, further reducing its thermal conductivity, but the production efficiency of VIP core materials is also improved, raw material waste is reduced, and production costs are effectively lowered. This optimized proportioning scheme makes the preparation process of VIP core materials more efficient and economical, while ensuring the high performance and stability of the product.

[0020] In some embodiments of the present invention, the biodegradable composite organic fiber has a diameter of 0.5 to 50 μm and a length of 1 to 100 mm.

[0021] This invention discovers that significant performance advantages can be achieved when the biodegradable composite organic fibers used in the VIP core material are within the aforementioned length and diameter range. Specifically, organic fibers within this size range not only enable the VIP core material to maintain a low density, but also allow the three-dimensional network architecture formed by the organic fibers and the void structure introduced by the porous material to work synergistically, further reducing the overall thermal conductivity of the VIP core material, thereby significantly improving the thermal insulation performance of the VIP panel.

[0022] A second aspect of the present invention provides a method for preparing the above-mentioned VIP core material, comprising the following steps:

[0023] The raw materials for preparing the biodegradable composite organic fiber are mixed and melt-spun to prepare the biodegradable composite organic fiber.

[0024] The biodegradable composite organic fibers are dispersed in a liquid to obtain a fiber suspension, which is then wet-laid and dried to obtain a fiber cloth.

[0025] The fiber cloth is stacked and heat-treated to obtain the heat-insulating core material.

[0026] The VIP core material preparation method provided by this invention can produce the VIP core material described in the first aspect of this invention, and therefore this preparation method also includes the aforementioned advantages of the VIP core material of this invention. Furthermore, this preparation method of this invention features simple process, mild reaction conditions, ease of operation, and high production efficiency, making it suitable for large-scale production applications.

[0027] The preparation method of this invention achieves uniformity in the biodegradable composite organic fibers. Furthermore, by employing a wet web-forming process, the biodegradable composite organic fibers can achieve efficient suspension during dispersion, thereby ensuring uniform fiber distribution in the mixed system. This efficient dispersion method provides favorable conditions for low basis weight of the fiber cloth in the wet web-forming process, resulting in a VIP core material with low density and extremely low thermal conductivity, significantly improving the thermal insulation performance of the VIP core material.

[0028] In some embodiments of the present invention, the process parameters for melt spinning are: melt temperature of 200-290°C, spinning temperature of 130-180°C, and spinning speed of 200-500 m / min.

[0029] This invention discovers that by using the above-mentioned melt spinning process parameters, biodegradable composite organic fibers can be prepared efficiently while improving the dispersion effect of each raw material.

[0030] In some embodiments of the present invention, the concentration (pulp concentration) of the biodegradable composite organic fiber in the fiber suspension is 0.005 wt% to 1 wt%.

[0031] In some embodiments of the present invention, the areal density of the fiber cloth is 2 to 150 g / m². 2 .

[0032] In some embodiments of the present invention, the drying temperature is 100–240°C.

[0033] The present invention also optimizes the above-mentioned process parameters in the preparation method. Research has shown that when the concentration of porous organic fibers on the surface of the fiber suspension, the areal density of the fiber cloth, and the drying temperature are all within the aforementioned ranges, a high-performance VIP core material can be prepared. Simultaneously, the optimized process parameters significantly improve the success rate and production efficiency of the product preparation, reduce raw material waste, and further enhance economic efficiency.

[0034] A third aspect of the present invention provides a vacuum insulation panel comprising the aforementioned insulation core material.

[0035] The VIP panel of the present invention has all the advantages of the aforementioned VIP core material, and has better heat insulation and lighter weight compared to traditional VIP panels.

[0036] A fourth aspect of the present invention provides a method for preparing a vacuum insulation panel, comprising the following steps:

[0037] The insulating core material is bagged, vacuum-sealed, and then the bag is sealed to obtain the vacuum insulation board.

[0038] The preparation method of the present invention is characterized by simple process, easy operation and high production efficiency, and is suitable for large-scale production application.

[0039] In some embodiments of the present invention, a getter and / or a desiccant are also added to the vacuum insulation panel.

[0040] According to a fifth aspect of the present invention, a heat preservation and / or heat insulation device is provided, including the above-described vacuum insulation panel.

[0041] In some embodiments of the present invention, the heat preservation and / or heat insulation equipment includes refrigerators, freezers, refrigerated containers, refrigerated transport vehicles, cold storage facilities, or insulated boxes.

[0042] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the description and claims. Detailed Implementation

[0043] The following will describe the concept and technical effects of the present invention clearly and completely with reference to embodiments, so as to fully understand the purpose, features and effects of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are all within the scope of protection of the present invention.

[0044] In the description of this invention, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0045] In the description of this invention, unless otherwise stated, the numerical range "a to b" represents a shortened representation of any combination of real numbers between a and b, where a and b are both real numbers. Unless otherwise stated, the various reaction or operation steps may be performed sequentially or not sequentially. In some embodiments, the reaction methods in this invention are performed sequentially.

[0046] Unless otherwise specified in the following examples, the techniques or conditions described in the literature in this field or in accordance with the product instructions shall apply. All reagents or instruments without a specified manufacturer are commercially available conventional products.

[0047] A first aspect of the present invention provides a thermal insulation core material, wherein the raw materials for preparing the thermal insulation core material include biodegradable composite organic fibers;

[0048] The raw materials for preparing the biodegradable composite organic fiber include a matrix polymer and biodegradable polymer materials;

[0049] The matrix polymer includes at least one of polyacrylonitrile (PAN), polyamide (PA), polyester (PET), polypropylene (PP), or polyethylene (PE).

[0050] The thermal insulation core material of the first aspect of the present invention has at least the following beneficial effects:

[0051] The thermal insulation core material of this invention is used as a vacuum thermal insulation core material. By combining the matrix polymer with biodegradable polymer materials to prepare biodegradable composite organic fibers, the thermal insulation core material has good biodegradability. Furthermore, the high rigidity of the organic fiber material provides support for the three-dimensional network structure of the VIP core material. Heat transfer takes place in the three-dimensional network architecture of the fiber, which can make full use of the low intrinsic thermal conductivity of the organic fiber, reduce the thermal conductivity of the thermal insulation core material and the prepared vacuum insulation board, and improve the thermal insulation performance.

[0052] The VIP core material of this invention also has a lower density, which makes the prepared VIP board lighter while maintaining excellent thermal insulation performance, significantly reducing the overall weight of the product, facilitating transportation and installation, and further improving the application flexibility and market competitiveness of the product.

[0053] Furthermore, the raw materials used in the preparation of the VIP core material in this invention are all environmentally friendly and meet strict environmental standards. These materials do not pollute the environment during production, use, or disposal, and pose no harm to human health. More importantly, the use of these environmentally friendly materials does not increase production costs; on the contrary, it effectively controls the production costs of the VIP core material and VIP board of this invention, resulting in a high cost-performance ratio and providing strong support for the widespread application of the product.

[0054] In some embodiments of the present invention, the matrix polymer is selected from at least one of polyacrylonitrile (PAN), polyamide (PA), or polyester (PET).

[0055] In some embodiments of the present invention, the biodegradable polymeric material includes at least one of polylactic acid (PLA), polybutylene adipate terephthalate (PBAT), cellulose (CE), chitosan (CS), polycaprolactone (PCL), polyvinyl alcohol (PVA), polyhydroxyalkanoates (PHA), and polybutylene succinate (PBS).

[0056] The biodegradable composite organic fiber used in the preparation of the VIP core material in this invention can be selected from widely available organic polymers. Both the matrix polymer and the biodegradable polymer material are mature products produced using existing mature processes. Compared with the glass fiber commonly used in traditional VIP panels, the organic fiber used in this invention avoids the potential health hazards of glass fiber dust during production, processing, and use, thus improving the safety of the product during production and use. The use of biodegradable composite organic fiber in this invention not only further enhances the thermal insulation performance of the VIP core material but also provides a more environmentally friendly and sustainable raw material option for the preparation of the VIP core material, further expanding the application scope and market prospects of VIP panels.

[0057] In some embodiments of the present invention, the raw materials for preparing the biodegradable composite organic fiber further include compatibilizers and / or antioxidants.

[0058] This invention also uses compatibilizers and antioxidants in the raw materials for preparing biodegradable composite organic fibers to improve the preparation efficiency. The use of compatibilizers enhances the biocompatibility of the biodegradable composite organic fibers, thereby improving their biodegradability in the natural environment. The use of antioxidants improves the stability of the biodegradable composite organic fibers during use, preventing aging during their normal service life.

[0059] In some embodiments of the present invention, the compatibilizer includes at least one of glycidyl methacrylate (ADR), ethylene copolymer (EMA) with a methyl acrylate content of 8% to 40%, and ethylene-butyl acrylate (EBA); the antioxidant includes at least one of IANOX 1010, RIANOX 1790, and AO-330.

[0060] In some embodiments of the present invention, the matrix polymer accounts for 30% to 70% of the mass fraction of the biodegradable composite organic fiber; and / or, the biodegradable polymer material accounts for 25% to 75% of the mass fraction of the biodegradable composite organic fiber.

[0061] In some embodiments of the present invention, the matrix polymer accounts for 35% to 65% of the mass fraction of the biodegradable composite organic fiber; and / or, the biodegradable polymer material accounts for 30% to 60% of the mass fraction of the biodegradable composite organic fiber.

[0062] In some embodiments of the present invention, the compatibilizer accounts for 1% to 5% of the mass fraction of the biodegradable composite organic fiber; and / or, the antioxidant accounts for 1% to 5% of the mass fraction of the biodegradable composite organic fiber.

[0063] In some embodiments of the present invention, the compatibilizer accounts for 2% to 3% of the mass fraction of the biodegradable composite organic fiber; and / or, the antioxidant accounts for 3% to 3% of the mass fraction of the biodegradable composite organic fiber.

[0064] This invention optimizes the proportions of raw materials used in the preparation of VIP core materials. By precisely adjusting the ratios of each raw material component, not only is the internal structure of the material optimized, further reducing its thermal conductivity, but the production efficiency of VIP core materials is also improved, reducing raw material waste and effectively lowering production costs. This optimized proportioning scheme makes the preparation process of VIP core materials more efficient and economical, while ensuring the high performance and stability of the product.

[0065] In some embodiments of the present invention, the raw materials for the biodegradable composite organic fiber also include chitosan and / or lubricants.

[0066] In some embodiments of the present invention, the biodegradable composite organic fiber has a diameter of 0.5 to 50 μm and a length of 1 to 100 mm.

[0067] In some embodiments of the present invention, the biodegradable composite organic fiber has a diameter of 1-20 μm and a length of 1-20 mm.

[0068] In some embodiments of the present invention, the biodegradable composite organic fiber has a diameter of 5-15 μm and a length of 2-10 mm.

[0069] This invention discovers that significant performance advantages can be achieved when the biodegradable composite organic fibers used in the VIP core material are within the aforementioned length and diameter range. Specifically, organic fibers within this size range not only enable the VIP core material to maintain a low density, but also allow the three-dimensional network architecture formed by the organic fibers and the void structure introduced by the porous material to work synergistically, further reducing the overall thermal conductivity of the VIP core material, thereby significantly improving the thermal insulation performance of the VIP panel.

[0070] A second aspect of the present invention provides a method for preparing the above-mentioned VIP core material, comprising the following steps:

[0071] S1. Mix the raw materials for preparing the biodegradable composite organic fiber and perform melt spinning to prepare the biodegradable composite organic fiber;

[0072] S2. Disperse the biodegradable composite organic fiber into a liquid to obtain a fiber suspension, wet-laid and dried to obtain a fiber cloth;

[0073] S3. Stack the fiber cloth and heat treat it to obtain the heat insulation core material.

[0074] The VIP core material preparation method provided in this embodiment of the invention can prepare the VIP core material described in the first aspect of the invention, and therefore this preparation method also includes the aforementioned advantages of the VIP core material of the invention. Furthermore, this preparation method of the invention features simple process, mild reaction conditions, ease of operation, and high production efficiency, making it suitable for large-scale production applications.

[0075] The preparation method of this invention can achieve uniformity of biodegradable composite organic fibers. Furthermore, by employing a wet web-forming process, the biodegradable composite organic fibers can achieve efficient suspension during dispersion, thereby ensuring uniform fiber distribution in the mixed system. This efficient dispersion method provides favorable conditions for low basis weight of the fiber cloth in the wet web-forming process, resulting in a VIP core material with low density and extremely low thermal conductivity, significantly improving the thermal insulation performance of the VIP core material.

[0076] In some embodiments of the present invention, the preparation of the biodegradable composite organic fiber is specifically achieved by: melting and mixing the matrix polymer and the biodegradable polymer material separately, then adding the compatibilizer and the antioxidant, mixing in a blender, granulating, and then performing solution spinning.

[0077] In some embodiments of the present invention, the process parameters for melt direct spinning in step S1 are: melt temperature of 200-290°C, spinning temperature of 130-180°C, and spinning speed of 200-500 m / min.

[0078] In some embodiments of the present invention, the process parameters for melt direct spinning in step S1 are: melt temperature of 260-290°C, spinning temperature of 140-160°C, and spinning speed of 250-400 m / min.

[0079] The present invention also found that when using the above-mentioned melt spinning process parameters, biodegradable composite organic fibers can be prepared efficiently while improving the dispersion effect of each raw material.

[0080] In some embodiments of the present invention, the concentration (pulp concentration) of the biodegradable composite organic fiber in the fiber suspension of step S2 is 0.005 wt% to 1 wt%.

[0081] In some embodiments of the present invention, the concentration (slurry concentration) of the biodegradable composite organic fiber in the fiber suspension of step S2 is 0.01 wt% to 0.1 wt%. This includes any value therein and all ranges and subranges. For example, it includes 0.02 wt%, 0.05 wt%, and 0.08 wt%.

[0082] In some embodiments of the present invention, the areal density of the fiber cloth in step S2 is 2 to 150 g / m². 2 .

[0083] In some embodiments of the present invention, the areal density of the fiber cloth described in step S2 is 5–20 g / m². 2 .

[0084] In some embodiments of the present invention, the areal density of the fiber cloth in step S2 is 10-14 g / m².2 .

[0085] In some embodiments of the present invention, the drying temperature in step S2 is 100–240°C.

[0086] In some embodiments of the present invention, the drying temperature in step S2 is 140–200°C. This includes any value therein, all ranges, and any subranges. For example, it includes 150°C, 160°C, and 180°C.

[0087] The present invention also optimizes the above-mentioned process parameters in the preparation method. Research has shown that when the concentration of porous organic fibers on the surface of the fiber suspension, the areal density of the fiber cloth, and the drying temperature are all within the aforementioned ranges, a high-performance VIP core material can be prepared. Simultaneously, the optimized process parameters significantly improve the success rate and production efficiency of the product preparation, reduce raw material waste, and further enhance economic efficiency.

[0088] In some embodiments of the present invention, the liquid in step S2 includes water.

[0089] In some embodiments of the present invention, in order to achieve a better monofilament suspension dispersion effect, mechanical stirring or microwave heating is used to disperse the fiber suspension prepared in step S2.

[0090] In some embodiments of the present invention, the thickness of the fiber cloth after stacking in step S3 is 0.5 to 5 cm.

[0091] In some embodiments of the present invention, the thickness of the fiber cloth after stacking in step S3 is 0.6 to 3 cm.

[0092] In some embodiments of the present invention, the heat treatment temperature in step S3 is 150-200°C and the time is 0.5-3 hours.

[0093] A third aspect of the present invention provides a vacuum insulation panel comprising the aforementioned insulation core material.

[0094] The VIP panel of this invention has all the advantages of the VIP core material described above, and has better heat insulation and lighter weight compared to traditional VIP panels.

[0095] A fourth aspect of the present invention provides a method for preparing a vacuum insulation panel, comprising the following steps:

[0096] The insulating core material is bagged, vacuum-sealed, and then the bag is sealed to obtain the vacuum insulation board.

[0097] The preparation method of this invention has the characteristics of simple process, easy operation and high production efficiency, and is suitable for large-scale production application.

[0098] In some embodiments of the present invention, a getter and / or a desiccant are also added to the vacuum insulation panel.

[0099] According to a fifth aspect of the present invention, a heat preservation and / or heat insulation device is provided, including the above-described vacuum insulation panel.

[0100] In some embodiments of the present invention, the heat preservation and / or heat insulation equipment includes refrigerators, freezers, refrigerated containers, refrigerated transport vehicles, cold storage facilities, or insulated boxes.

[0101] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the description and claims.

[0102] Example 1

[0103] This embodiment provides a biodegradable composite organic fiber VIP core material.

[0104] The biodegradable composite organic fiber VIP core material of this embodiment is prepared from 65 wt% polyester (PET), 30 wt% polylactic acid (PLA), 2.5 wt% biocompatibility agent and 2.5 wt% antioxidant.

[0105] The biocompatibility agent is 2,3-glycidyl methacrylate (ADR), and the antioxidant is IANOX 1010.

[0106] The preparation steps of the biodegradable composite organic fiber VIP core material in this embodiment are as follows:

[0107] (1) Take 1300g of polyester and 600g of polylactic acid, melt them separately and mix them evenly. Then add 50g of biocompatibility agent and 50g of antioxidant agent, mix them in a blender, and after mixing, granulate them out. Prepare slices and then melt spin them directly. Control the melt temperature to 280℃, the spinning temperature to 150℃, and the spinning speed to 300m / min. Obtain a biodegradable composite organic fiber with a diameter of 10μm and a length of 5mm through one or more steps of stretching.

[0108] (2) Disperse the biodegradable composite organic fiber obtained in step (1) into water, and disperse it evenly by mechanical stirring to prepare a fiber suspension with a biodegradable composite organic fiber mass content of 0.05%.

[0109] (3) The fiber suspension obtained in step (2) is wet-laid and water-controlled for 5 minutes, then placed in an oven at 180℃ for 2 hours and baked. After demolding, a surface density of 13 g / m³ is obtained. 2 Fiber cloth;

[0110] (4) Stack the fiber cloth obtained in step (3) and bake it again in a drying tunnel at a temperature of 200℃ for 2 hours to obtain VIP core material;

[0111] The fiber cloth is cut to a size of 1000mm×650mm, and the number of fiber cloth layers is controlled to a final board thickness of 1cm when stacked.

[0112] This embodiment also provides a method for preparing a VIP board using the VIP core material prepared above, with the specific steps as follows:

[0113] (1) The VIP core material prepared above is bagged, and one getter (self-made, 3.5g / bag) and one desiccant packet (self-made, 15g / packet) are added. Then, the bag is placed in a vacuum sealing machine for vacuuming. When the vacuum degree reaches 3.5×10 -3 When Pa is reached, a heat sealing process is performed, with the heat sealing time set to 15s and the heat sealing voltage set to 13V, to obtain a sealed VIP board;

[0114] (2) Press the VIP board to puncture the getter shell and further reduce the internal pressure of the VIP board. After placing it at room temperature for 12 hours, test the thermal conductivity.

[0115] The VIP core material is packaged in a high-barrier composite membrane commonly used in this field, the getter material is a non-evaporative getter (NEG), and the desiccant is calcium oxide.

[0116] Example 2

[0117] This embodiment provides a biodegradable composite organic fiber VIP core material.

[0118] The biodegradable composite organic fiber VIP core material of this embodiment is prepared from 35 wt% polyester (PET), 60 wt% polylactic acid (PLA), 2.5 wt% biocompatibility agent and 2.5 wt% antioxidant.

[0119] The biocompatibility agent is 2,3-glycidyl methacrylate (ADR), and the antioxidant is IANOX 1010.

[0120] The preparation steps of the biodegradable composite organic fiber VIP core material in this embodiment are as follows:

[0121] (1) Take 700g of polyester and 1200g of polylactic acid, melt them separately and mix them evenly. Then add 50g of biocompatibility agent and 50g of antioxidant agent, mix them in a blender, and after mixing, granulate them out. Prepare slices and then melt spin them directly. Control the melt temperature to 280℃, the spinning temperature to 150℃, and the spinning speed to 300m / min. Obtain biodegradable composite organic fiber with a diameter of 10μm and a length of 5mm through one or more steps of stretching.

[0122] (2) Disperse the biodegradable composite organic fiber obtained in step (1) into water, and disperse it evenly by mechanical stirring to prepare a fiber suspension with a biodegradable composite organic fiber mass content of 0.05%.

[0123] (3) The fiber suspension obtained in step (2) is wet-laid and water-controlled for 5 minutes, then placed in an oven at 180℃ for 2 hours and baked. After demolding, a surface density of 13 g / m³ is obtained. 2 Fiber cloth;

[0124] (4) Stack the fiber cloth obtained in step (3) and bake it again in a drying tunnel at a temperature of 200℃ for 2 hours to obtain VIP core material;

[0125] The fiber cloth is cut to a size of 1000mm×650mm, and the number of fiber cloth layers is controlled to a final board thickness of 1cm when stacked.

[0126] This embodiment also provides a method for preparing a VIP board using the VIP core material prepared above, with the specific steps as follows:

[0127] (1) The VIP core material prepared above is bagged, and one getter (self-made, 3.5g / bag) and one desiccant packet (self-made, 15g / packet) are added. Then, the bag is placed in a vacuum sealing machine for vacuuming. When the vacuum degree reaches 3.5×10 -3 When Pa is reached, a heat sealing process is performed, with the heat sealing time set to 15s and the heat sealing voltage set to 13V, to obtain a sealed VIP board;

[0128] (2) Press the VIP board to puncture the getter shell and further reduce the internal pressure of the VIP board. After placing it at room temperature for 12 hours, test the thermal conductivity.

[0129] The VIP core material is packaged in a high-barrier composite membrane commonly used in this field, the getter material is a non-evaporative getter (NEG), and the desiccant is calcium oxide.

[0130] Comparative Example 1

[0131] This comparative example provides a VIP core material.

[0132] The raw material for preparing the VIP core material in this comparative example is glass fiber.

[0133] The preparation steps of the VIP core material in this comparative example are as follows:

[0134] (1) Take 2000g of circular glass fibers with a diameter of 10μm and a length of 5mm and disperse them in water. After mechanical stirring, the dispersion is uniform, and a glass fiber suspension with a glass fiber mass content of 0.05% is prepared.

[0135] (2) The glass fiber suspension obtained in step (1) is wet-laid and water-controlled for 5 minutes, then placed in an oven at 180℃ for 2 hours and baked. After demolding, a surface density of 25 g / m³ is obtained. 2 Fiberglass mat;

[0136] (3) Stack the fiberglass mats obtained in step (2) and bake them again in an oven at 200°C for 2 hours to obtain VIP core material;

[0137] The fiberglass mat is cut to a size of 1000mm×650mm, and the number of fiberglass mat layers is controlled to ensure that the final board thickness is 1cm when stacked.

[0138] This comparative example also provides the preparation of a VIP board using the VIP core material prepared above, with the specific steps as follows:

[0139] (1) The VIP core material prepared above is bagged, and one getter (self-made, 3.5g / bag) and one desiccant packet (self-made, 15g / packet) are added. Then, the bag is placed in a vacuum sealing machine for vacuuming. When the vacuum degree reaches 3.5×10 -3 When Pa is reached, a heat sealing process is performed, with the heat sealing time set to 15s and the heat sealing voltage set to 13V, to obtain a sealed VIP board;

[0140] (2) Press the VIP board to puncture the getter shell and further reduce the internal pressure of the VIP board. After placing it at room temperature for 12 hours, test the thermal conductivity.

[0141] The VIP core material is packaged in a high-barrier composite membrane commonly used in this field, the getter material is a non-evaporative getter (NEG), and the desiccant is calcium oxide.

[0142] Comparative Example 2

[0143] This comparative example provides a VIP core material.

[0144] The raw material for preparing the VIP core material in this comparative example is PET fiber.

[0145] The preparation steps of the VIP core material in this comparative example are as follows:

[0146] (1) Take 2000g of round PET fibers with a diameter of 10μm and a length of 5mm and disperse them in water. After mechanical stirring, the fibers are dispersed evenly to prepare a fiber suspension with a PET fiber mass content of 0.05%.

[0147] (2) The fiber suspension obtained in step (1) is wet-laid and water-controlled for 5 minutes, then placed in an oven at 180℃ for 2 hours and baked. After demolding, a surface density of 15 g / m³ is obtained. 2 Fiber cloth;

[0148] (3) Stack the fiber cloth obtained in step (2) and bake it again in a drying tunnel at a temperature of 200℃ for 2 hours to obtain VIP core material;

[0149] The fiber cloth is cut to a size of 1000mm×650mm, and the number of fiber cloth layers is controlled to a final board thickness of 1cm when stacked.

[0150] This comparative example also provides the preparation of a VIP board using the VIP core material prepared above, with the specific steps as follows:

[0151] (1) The VIP core material prepared above is bagged, and one getter (self-made, 3.5g / bag) and one desiccant packet (self-made, 15g / packet) are added. Then, the bag is placed in a vacuum sealing machine for vacuuming. When the vacuum degree reaches 3.5×10 -3 When Pa is reached, a heat sealing process is performed, with the heat sealing time set to 15s and the heat sealing voltage set to 13V, to obtain a sealed VIP board;

[0152] (2) Press the VIP board to puncture the getter shell and further reduce the internal pressure of the VIP board. After placing it at room temperature for 12 hours, test the thermal conductivity.

[0153] The VIP core material is packaged in a high-barrier composite membrane commonly used in this field, the getter material is a non-evaporative getter (NEG), and the desiccant is calcium oxide.

[0154] Comparative Example 3

[0155] This comparative example provides a VIP core material.

[0156] The raw material for preparing the VIP core material in this comparative example is polyimide (PAN) fiber.

[0157] The preparation steps of the VIP core material in this comparative example are as follows:

[0158] (1) Take 2000g of PAN fibers with a diameter of 10μm and a length of 5mm and disperse them in water. After mechanical stirring, the fibers are dispersed evenly to prepare a fiber suspension with a PAN fiber mass content of 0.05%.

[0159] (2) The fiber suspension obtained in step (1) is wet-laid and water-controlled for 5 minutes, then placed in an oven at 180℃ for 2 hours and baked. After demolding, a surface density of 15 g / m³ is obtained. 2 Fiber cloth;

[0160] (3) Stack the fiber cloth obtained in step (2) and bake it again in a drying tunnel at a temperature of 200℃ for 2 hours to obtain VIP core material;

[0161] The fiber cloth is cut to a size of 1000mm×650mm, and the number of fiber cloth layers is controlled to a final board thickness of 1cm when stacked.

[0162] This comparative example also provides the preparation of a VIP board using the VIP core material prepared above, with the specific steps as follows:

[0163] (1) The VIP core material prepared above is bagged, and one getter (self-made, 3.5g / bag) and one desiccant packet (self-made, 15g / packet) are added. Then, the bag is placed in a vacuum sealing machine for vacuuming. When the vacuum degree reaches 3.5×10 -3 When Pa is reached, a heat sealing process is performed, with the heat sealing time set to 15s and the heat sealing voltage set to 13V, to obtain a sealed VIP board;

[0164] (2) Press the VIP board to puncture the getter shell and further reduce the internal pressure of the VIP board. After placing it at room temperature for 12 hours, test the thermal conductivity.

[0165] The VIP core material is packaged in a high-barrier composite membrane commonly used in this field, the getter material is a non-evaporative getter (NEG), and the desiccant is calcium oxide.

[0166] Performance testing:

[0167] The thermal conductivity of the VIP plates in each embodiment and comparative example was tested (refer to GB / T 39704-2020). The test results and some parameters in the preparation steps are summarized and compared in Table 1.

[0168] Table 1

[0169]

[0170] The degradation performance of the VIP core materials prepared in each example and comparative example was then tested (refer to GB / T 19275-2003). The test results showed that the VIP core materials of Example 1 and Example 2 degraded by 80% and 85% respectively in the natural environment after 13 months, while the VIP core materials of Comparative Examples 1 to 3 hardly degraded.

[0171] The test results above show that the VIP core materials prepared using Examples 1 and 2 of the present invention not only possess good biodegradability but also result in VIP boards with extremely low thermal conductivity, reaching as low as 1.25 mW / m·K. Furthermore, the fiber cloth in the VIP core material prepared by the present invention has a low areal density, thus exhibiting superior lightweight properties.

[0172] Therefore, the vacuum insulation panel (VIP panel) of the present invention exhibits significant advantages in terms of thermal insulation and biodegradability. Specifically, through optimization of raw material selection, structural design, and manufacturing process, the VIP panel achieves extremely low thermal conductivity, thereby possessing excellent thermal insulation performance. Simultaneously, the use and proportioning of biodegradable materials, as well as the application of biocompatibility and antioxidants, enhances the VIP panel's biodegradability in the natural environment, meeting environmental protection and low-carbon requirements and satisfying the needs of sustainable development. With these characteristics, the VIP panel of the present invention has broad application prospects in equipment requiring efficient thermal insulation. For example, in the field of household appliances, the VIP panel can be used in refrigeration or freezing equipment, effectively reducing energy consumption and improving the equipment's thermal insulation performance; in industrial equipment, it can be used in insulation systems requiring strict temperature control, such as cold storage, significantly improving the equipment's thermal insulation efficiency and reducing its weight. Therefore, the VIP panel of the present invention not only meets existing market demands but also provides a more efficient and environmentally friendly solution for related fields, demonstrating significant economic and social benefits.

[0173] Comparative Example 1 uses a similar preparation method to the embodiments of the present invention, but it only uses traditional glass fiber as raw material. Besides known drawbacks such as generating large amounts of glass fiber dust which can harm human health, the VIP core material prepared using the process of the present invention has a high thermal conductivity of 1.813 mW / m·K, making it difficult to achieve superior thermal insulation performance. Furthermore, the fiber surface density in the prepared VIP core material is also high, resulting in poor lightweight properties of the VIP board and reduced application flexibility.

[0174] Comparative Examples 2 and 3 used PET fiber and PAN fiber to prepare VIP core materials, respectively. The thermal conductivity of their VIP core materials was also relatively high, making it difficult to further reduce the thermal conductivity of the prepared VIP boards. Furthermore, the areal density of the fiber cloth in their VIP core materials was also high, and their biodegradability was poor. This indicates that the VIP core material prepared using the raw material combination of this invention can achieve better thermal insulation, better lightweight properties, and better biodegradability.

[0175] In summary, this invention utilizes the efficient suspension and dispersion of organic fibers to create conditions for low basis weight of the fiber cloth after wet web forming, while simultaneously leveraging the high rigidity of organic fiber materials to provide support for the three-dimensional network structure of the VIP core material. Heat transfer in the VIP board of this invention takes place within the three-dimensional fiber network architecture, fully utilizing the low intrinsic thermal conductivity of organic fibers. The core material of the VIP board uses biodegradable organic materials as one of the main materials. In the preparation process, fibers are dissolved in water to form a suspension, which is then processed into a fiber cloth using a wet web forming process. The fiber cloths are stacked to form the VIP core material, and after drying, vacuuming, and encapsulation, an ultra-low thermal conductivity VIP board with an initial thermal conductivity of less than 1.4 mW / m·K is finally prepared.

[0176] The embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.

Claims

1. A thermal insulation core material, characterized in that, The raw materials for preparing the thermal insulation core material include biodegradable composite organic fibers; The raw materials for preparing the biodegradable composite organic fiber include a matrix polymer and biodegradable polymer materials; The matrix polymer includes at least one of polyacrylonitrile, polyamide, polyester, polypropylene, or polyethylene.

2. The thermal insulation core material according to claim 1, characterized in that, The biodegradable polymeric material includes at least one of polylactic acid, polybutylene adipate terephthalate, cellulose, chitosan, polycaprolactone, polyvinyl alcohol, polyhydroxyalkanoates, and polybutylene succinate.

3. The thermal insulation core material according to claim 1, characterized in that, The raw materials for preparing the biodegradable composite organic fiber also include compatibilizers and / or antioxidants.

4. The thermal insulation core material according to any one of claims 1-3, characterized in that, The matrix polymer accounts for 30% to 70% of the mass fraction of the biodegradable composite organic fiber; And / or, the biodegradable polymer material accounts for 25% to 75% of the mass fraction of the biodegradable composite organic fiber.

5. The thermal insulation core material according to any one of claims 3, characterized in that, The compatibilizer accounts for 1% to 5% of the mass fraction of the biodegradable composite organic fiber; And / or, the antioxidant accounts for 1% to 5% of the mass fraction of the biodegradable composite organic fiber.

6. The thermal insulation core material according to any one of claims 1-3, characterized in that, The biodegradable composite organic fiber has a diameter of 0.5–50 μm and a length of 1–100 mm.

7. A method for preparing an insulating core material as described in any one of claims 1 to 6, characterized in that, Includes the following steps: The raw materials for preparing the biodegradable composite organic fiber are mixed and melt-spun to prepare the biodegradable composite organic fiber. The biodegradable composite organic fibers are dispersed in a liquid to obtain a fiber suspension, which is then wet-laid and dried to obtain a fiber cloth. The fiber cloth is stacked and heat-treated to obtain the heat-insulating core material.

8. The preparation method according to claim 7, characterized in that, The process parameters for melt spinning are: melt temperature of 200-290℃, spinning temperature of 130-180℃, and spinning speed of 200-500m / min.

9. The preparation method according to claim 7, characterized in that, The concentration of the biodegradable composite organic fiber in the fiber suspension is 0.005 wt% to 1 wt%.

10. The preparation method according to claim 7, characterized in that, The areal density of the fiber cloth is 2-150 g / m². 2 .

11. The preparation method according to claim 7, characterized in that, The drying temperature is 100–240°C.

12. A vacuum insulation panel, characterized in that, Includes the thermal insulation core material as described in any one of claims 1 to 6.

13. A method for preparing a vacuum insulation panel as described in claim 12, characterized in that, Includes the following steps: The insulating core material is bagged, vacuum-sealed, and then the bag is sealed to obtain the vacuum insulation board.

14. The method for preparing a vacuum insulation panel according to claim 13, characterized in that, The vacuum insulation panel also contains a getter and / or a desiccant.

15. A heat preservation and / or heat insulation device, characterized in that, Includes the vacuum insulation panel as described in claim 12.

16. The heat preservation and / or heat insulation device according to claim 15, characterized in that, The insulation and / or heat insulation equipment includes refrigerators, freezers, refrigerated containers, refrigerated transport vehicles, cold storage facilities, or insulated boxes.

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