GB2621902A - Porous sealing plate and preparation method therefor - Google Patents

Abstract

Provided in the present invention are a porous sealing plate and a preparation method therefor, which belong to the technical field of sealing plates. The porous sealing plate comprises an enclosure frame, a core material, a getter and a membrane material, wherein the getter is located in the core material, and the core material has an aperture and is an inorganic powder and/or fiber; the enclosure frame has a continuous outline structure, is made of an engineering plastic, and is located at the periphery of the core material, the aperture of the core material or both the periphery and the inner aperture of the core material; the membrane material is an aluminum-plastic composite membrane, a polyimide composite membrane, a metallized membrane or an inorganic non-metal coated plastic composite membrane; and the membrane material wraps the surface of the core material. By controlling the enclosure frame structure of an engineering plastic, the free design of the appearance and the inner aperture structure of a porous sealing plate having a complex structure is achieved, a breakthrough is made to the single and unchanged structural appearance characteristic caused by vacuum sealing of a traditional porous sealing plate, the porous sealing plate can adapt to the heat preservation and heat insulation of a complex structure, and the application range thereof is widened; moreover, the flatness of the appearance or the inner aperture of the porous sealing plate is improved by the enclosure frame of the engineering plastic, and the porous sealing plate is not prone to deformation.

Description

POROUS SEALING PLATE AND PREPARATION METHOD THEREOF

CROSS REFERENCE TO RELATED APPLICATION

[0001] The present disclosure claims the priority to Chinese Patent Application CN202210396382.9, titled "POROUS SEALING PLATE AND PREPARATION METHOD THEREOF", filed with China National Intellectual Property Administration (CNIPA) on April 15, 2022, which is incorporated herein by reference in its entirety.

TECHNICAL FIELD

[0002] The present disclosure relates to the technical field of sealing plates, in particular to a porous sealing plate and a preparation method thereof

BACKGROUND ART

[0003] A porous sealing plate is prepared from a filling core and a surface-protective barrier membrane through vacuum packaging, and can effectively avoid heat transfer caused by air convection and greatly reduce a thermal conductivity, thereby achieving ideal thermal insulation effects such as heat preservation under energy saving and environmental protection. Therefore, the porous sealing plate can play a huge role in building insulation, cold chain logistics, oil and gas pipelines, and aerospace insulation. In practical uses, due to an inherent vacuum sealing structure, porous sealing plates are generally only processed into regular square and rectangular plate-like structures, such as examples in Chinese patents CN215212018U and CN110762204B. It is difficult to prepare a porous sealing plate with a complex shape, precise size or a porous structure, since the complex shape or the porous structure may easily lead to damages of the membrane and collapse of the core, thus limiting a scope of use. For example, special-shaped pipelines and thermal pipelines for solar water heaters, low-temperature liquefied natural gas, and petroleum gas, or low-temperature pipelines for refrigerated ships and refrigerated containers require the porous sealing plates with a complex structure. Accordingly, it is urgent to develop porous sealing plates with a complex structure to meet thermal insulation requirements of the complex structures and to adapt to thermal insulation in different use environments.

SUMMARY

[0004] In view of this, an objective of the present disclosure is to provide a porous sealing plate and a preparation method thereof In the present disclosure, a shape and an inner pore structure of the porous sealing plate with a complex structure can be freely designed by controlling a structure of the engineering plastic frame, which breaks through a single invariable structural shape caused by vacuum sealing of traditional porous sealing plates. The porous sealing plate is suitable for thermal insulation of complex structures, thereby widening a use range.

[0005] To achieve the above objective, the present disclosure provides the following technical solutions, [0006] The present disclosure provides a porous sealing plate, including a frame 1, a core 4, a getter 3, and a membrane 2, where the getter 3 is arranged inside the core 4, and the core 4 has openings, and is prepared from an inorganic powder and/or a fiber; the frame 1 has a continuous structure, is prepared from an engineering plastic, and is arranged on a periphery of the core 4, or on the openings of the core 4, or on both the periphery of the core 4 and the openings of the core 4; the membrane 2 is an aluminum-plastic composite membrane, a polyimide composite membrane, a metallized membrane, or an inorganic non-metallic coating plastic composite membrane, and wraps a surface of the core 4.

[0007] Preferably, the engineering plastic may be nylon (polyamide, PA), polytetrafluoroethylene, polycarbonate, polyimide, or polyurethane.

[0008] Preferably, an inner surface and/or an outer surface of the frame 1 may further include an infrared reflective coating layer and/or an infrared reflective film layer.

[0009] Preferably, the getter 3 may be a CaO composite powder and/or a CaCE composite powder.

[0010] Preferably, the getter 3 has a particle size of ljtm to 100 pm.

[0011] Preferably, in the CaO composite powder and the CaCE composite powder, a composite powder is independently one or more selected from the group consisting of a zirconium-aluminum 16 getter, a zirconium-graphite getter, a zirconium-nickel getter, and a zirconium-iron-vanadium getter.

[0012] Preferably, a hot-melt adhesive membrane prepared from the membrane or the engineering plastic by hot-melting may be further provided between the frame 1 and the membrane 2.

[0013] Preferably, the hot-melt adhesive membrane may have a membrane thickness of 30 jtm to 100 pm, and may be prepared from a polyethylene (PE) membrane, a polyethylene-polyvinyl acetate copolymer (EVA) adhesive membrane, a polyethylene terephthalate (PET) adhesive membrane, a PA66 adhesive membrane, a polyolefin (PO) adhesive membrane, or a thermoplastic polyurethane (TPU) adhesive membrane [0014] Preferably, the core 4 may have 30% to 80% of the inorganic powder by mass fraction. [0015] Preferably, the inorganic powder may be a silica nano-powder, a mixture of silica and glass fiber, a mixture of fumed silica and microsilica, a mixture of the fumed silica and volcanic ash, a mixture of the fumed silica and a marble powder, or a mixture of the fumed silica and a slag powder.

100161 Preferably, the fiber is selected from the group consisting of flame glass wool and centrifugal glass wool.

[0017] Preferably, the core 4 has 15 wt% to 69 wt?/ of the fiber.

[0018] The present disclosure further provides a preparation method of the porous sealing plate, including the following steps: [0019] processing an engineering plastic plate into the frame 1 by cutting; [0020] embedding the frame 1 and the core 4 to form a composite core structure; [0021] loading the composite core structure into the membrane 2, and conducting encapsulation to obtain a sealing plate semi-finished product; and [0022] heat-sealing a surface of the sealing plate semi-finished product, and removing the engineering plastic inside the core 4 and the membrane that is not heat-sealed on an outer surface of the frame 1 to obtain the porous sealing plate.

[0023] Preferably, the heat-sealing may be conducted at 100°C to 500°C and 0.1 MPa to 0.5 MPa.

[0024] Compared with the existing materials and technologies, the present disclosure has the following beneficial effects: (1) through a vacuum environment inside the porous sealing plate and openings with micro-and nano-pore diameters in the core 4, the heat transfer caused by air convection can be effectively avoided to obtain an ultra-low thermal conductivity, with a thermal conductivity of as low as 1.6 mW/(m IC); (2) a shape and an inner pore structure of the porous sealing plate with a complex structure can be freely designed by controlling a structure of the engineering plastic frame 1, which breaks through a single invariable structural shape caused by vacuum sealing of traditional porous sealing plates. The porous sealing plate is suitable for thermal insulation of complex structures, thereby widening a use range; (3) a flatness of the shape or inner pore structure of the porous sealing plate is significantly improved by the engineering plastic frame, such that the plate has neat edges, precision, and low roughness, which is not easily deformed; (4) an excellent infrared reflective properties of the membrane 2 can significantly reduce infrared thermal radiation, thereby further reducing the thermal conductivity; and (5) an outer surface of the frame 1 further includes an infrared reflective coating to further reduce the thermal conductivity.

100251 The present disclosure further provides a preparation method of the porous sealing plate, with a simple and convenient manufacture process and a low cost. In the present disclosure, the porous sealing plate with a complex structure is prepared by combining the pre-set engineering plastic frame with a heat-sealing process, breaking through a structure limitation of the vacuum packaging, and meeting thermal insulation requirements of different structures in a complex environment.

BRIEF DESCRIPTION OF THE DRAWINGS

[0026] FIG. I shows a schematic diagram of a planar structure of Example I in the present disclosure; 100271 FIG. 2 shows a schematic diagram of a cross-sectional structure of Example 1 in the present disclosure; 100281 FIG. 3 shows a schematic diagram of a planar structure of Example 2 in the present disclosure; and [0029] FIG. 4 shows a schematic diagram of a planar structure of Example 3 in the present disclosure.

[0030] Reference numerals: I. frame; 2. membrane; 3 getter and 4, core.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] The present disclosure provides a porous sealing plate, including a frame 1, a core 4, a getter 3, and a membrane 2, where the getter 3 is arranged inside the core 4, and the core 4 has openings, and is prepared from an inorganic powder and/or a fiber; the frame 1 has a continuous structure, is prepared from an engineering plastic, and is arranged on a periphery of the core 4, or on the openings of the core 4, or on both the periphery and the openings of the core 4; the membrane 2 is an aluminum-plastic composite membrane, a polyimide composite membrane, a metallized membrane, or an inorganic non-metallic coating plastic composite membrane, and wraps a surface of the core 4.

[0032] In the present disclosure, unless otherwise specified, all raw materials used are commercially available products conventional in the art.

[0033] In the present disclosure, the porous sealing plate includes a frame 1; there is no special limitation on a shape of the frame 1, and the frame I can be designed according to needs of those skilled in the art, such as a plum blossom shape.

100341 In the present disclosure, the engineering plastic is preferably nylon (polyamide, PA), polytetrafluoroethylene, polycarbonate, polyimide, or polyurethane.

[0035] In the present disclosure, an outer surface of the frame 1 preferably further includes an infrared reflective coating. There is no special limitation on a specific composition of the infrared reflective coating, and infrared reflective coatings well known to those skilled in the art can be used.

[0036] In the present disclosure, the porous sealing plate further includes a getter 3, and the getter 3 is preferably a CaO composite powder and/or a CaC12 composite powder.

[0037] In the present disclosure, the composite powder includes preferably one or more of a zirconium aluminum 16 getter, a zirconium graphite getter, a zirconium nickel getter, and a zirconium iron vanadium getter.

[0038] In the present disclosure, the getter 3 has a particle size of preferably 1 pm to 100 pm. [0039] In the present disclosure, the core 4 has preferably 1 wt?/ to 5 wt% of the getter 3.

100401 In the present disclosure, the inorganic powder is preferably fumed silica, a mixture of the fumed silica and microsilica, a mixture of the fumed silica and volcanic ash, a mixture of the fumed silica and a marble powder, or a mixture of the fumed silica and a slag powder.

100411 In the present disclosure, the core 4 has preferably 30% to 80% of the inorganic powder by mass fraction.

[0042] In the present disclosure, the fiber is preferably flame glass fiber wool or centrifugal glass fiber wool.

100431 In the present disclosure, the core 4 has preferably 15 wt% to 69 wt% of the fiber.

[0044] In the present disclosure, a hot-melt adhesive membrane preferably prepared from the membrane or the engineering plastic by hot-melting is preferably further provided between the frame 1 and the membrane 2; an innermost layer of the membrane is hot-melted to obtain the hot-melt adhesive membrane, or the engineering plastic is preferably coated with a hot-melt adhesive membrane before use, and the hot-melt adhesive membrane is hot-melted to obtain the hot-melt adhesive membrane.

100451 In the present disclosure, the hot-melt adhesive membrane has a membrane thickness of preferably 30 pm to 100 p.m, more preferably 50 p.m, and is preferably prepared from a polyethylene (PE) membrane, a polyethylene-polyvinyl acetate copolymer (EVA) adhesive membrane, a polyethylene terephthalate (PET) adhesive membrane, a PA66 adhesive membrane, a polyolefin (PO) adhesive membrane, or a thermoplastic polyurethane (TPU) adhesive membrane.

[0046] The present disclosure further provides a preparation method of the porous sealing plate, including the following steps: 100471 processing an engineering plastic plate into the frame 1 by cutting; [0048] embedding the frame 1 and the core 4 to form a composite core structure; [0049] loading the composite core structure into the membrane 2, and conducting encapsulation to obtain a sealing plate semi-finished product; and [0050] heat-sealing a surface of the sealing plate semi-finished product, and removing the engineering plastic inside the core 4 and the membrane that is not heat-sealed on an outer surface of the frame 1 to obtain the porous sealing plate.

100511 In the present disclosure, the engineering plastic plate is processed into the frame 1 by cutting.

[0052] In the present disclosure, when the frame 1 is arranged at the openings of the core 4, the engineering plastic plate is preferably processed into an engineering plastic frame by cutting. [0053] In the present invention, there is no special limitation on a specific method of the processing, and methods well known to those skilled in the art can be used.

[0054] In the present disclosure, when a hot-melt adhesive membrane preferably prepared from the engineering plastic by hot-melting is preferably further provided between the frame I and the membrane 2, the engineering plastic plate is preferably coated with a hot-melt adhesive material before cutting, and the hot-melt adhesive material is hot-melted to form the hot-melt adhesive membrane.

[0055] In the present disclosure, the frame 1 and the core 4 are embedded to form the composite core structure. Preferably, the core 4 is cut, pores are processed in the core 4, and an outer shape of the core 4 is processed into a structure having a specific shape. The core 4 is preferably dried before use.

[0056] In the present disclosure, the frame I is embedded in the cut pores in the core 4, or the core 4 is embedded in the frame I to form the composite core structure, followed by conducting position fixing to prevent displacement [0057] In the present disclosure, the composite core structure is loaded into the membrane 2, and encapsulation is conducted to obtain the sealing plate semi-finished product. The membrane 2 is preferably dried before use [0058] In the present disclosure, the membrane 2 is preferably used in the form of a membrane bag.

[0059] In the present disclosure, the composite core structure is preferably packed into the membrane bag.

[0060] In the present disclosure, preferably a bagged composite core structure is put into a vacuum sealing machine; a plate is pressed on the membrane bag to avoid uneven packaging, upper and lower layers of the heat-sealing membranes are flattened, a vacuum chamber cover is put down, the cover is compacted by vacuumizing, and heat-sealing metal strips are heated; the metal strips conduct heat to the hot-melt adhesive membrane in an inner layer of the membrane bag, such that the upper and lower layers of the hot-melt adhesive membranes are melted and bonded [0061] In the present disclosure, after the encapsulation is completed, the power is preferably cut off to cool down, the air is released into the vacuum chamber, and the cover is lifted to obtain the sealing plate semi-finished product [0062] In the present disclosure, the surface of the sealing plate semi-finished product is heat-sealed, and the engineering plastic inside the core 4 and the membrane that is not heat-sealed on an outer surface of the frame 1 are removed to obtain the porous sealing plate. [0063] In the present disclosure, a position of the engineering plastic is found on a plane of the sealing plate semi-finished product, and heat-sealing is conducted on the membrane above the position of the engineering plastic, to realize dense bonding between the engineering plastic and the membrane by hot-melting.

[0064] In the present disclosure, the heat-sealing is conducted at preferably 100°C to 500°C, more preferably 150°C to 300°C and preferably 0.1 MiPa to 0.5 IVIPa, more preferably 0.2 IVIIPa to 0.3 MPa.

[0065] In the present invention, the position of the engineering plastic is found on the plane of the sealing plate semi-finished product, and the membrane is removed from the engineering plastic.

[0066] In the present disclosure, the non-heat-sealed membrane is preferably removed on an outer surface of the frame of the sealing plate semi-finished product, to obtain the porous sealing plate.

[0067] In the present disclosure, an inner surface and/or an outer surface of the frame 1 further includes preferably an infrared reflective coating layer and/or an infrared reflective film layer. The infrared reflective coating layer is preferably formed by spraying an infrared reflective coating, and the infrared reflective film layer is preferably formed by bonding an infrared reflective film.

[0068] In the present disclosure, the getter 3 is further placed inside the core 4 to obtain the porous sealing plate.

[0069] To further describe the present disclosure, the porous sealing plate and the preparation method thereof provided by the present disclosure are described in detail below with reference to examples. However, these examples should not be construed as limitations to the protection scope of the present disclosure.

[0070] Example 1

[0071] As shown in FIG. 1 and FIG. 2, a porous sealing plate with circular pores and in a plum blossom shape had a thickness of 0.01 m, a maximum distance of 0.5 m from a center to an edge of the plum blossom shape, and a diameter of 1 cm in each circular pore. The porous sealing plate included a frame, a core, a getter, and a membrane, where the frame had a continuous structure and was processed from an engineering plastic, and the engineering plastic was polyurethane; there were 8 frames, including 1 plum blossom-shaped frame arranged on a periphery of the core, and 7 circular frames arranged in an inner opening of the core; a main body of the core was a mixture of a nano-silica powder and centrifugal glass fiber wool, the nano-silica powder had a content of 30 wt%, and the core was wrapped by the frame and the membrane; the getter was a CaO composite powder placed inside the core, with a content of 3wt%; the membrane was a metallized membrane arranged on upper and lower surfaces of a core plane; the engineering plastic was hot-melt-bonded to the membrane through a hot-pressing technology; an outer surface of the frame was provided with an infrared reflective coating layer in a thickness of 0.1 mm.

[0072] A preparation method included the following steps: 100731 (1) an engineering plastic plate was processed into 8 engineering plastic rings by cutting; 100741 (2) the core and a membrane bag were dried; [0075] (3) the core was cut, circular pores were processed in the core and the core was processed into a specific plum blossom-shaped structure; [0076] (4) 7 circular engineering plastic rings were embedded into the cut pores of the core, and the core was embedded into plum blossom-shaped engineering plastic ring to form a composite core structure, followed by conducting position fixing to prevent displacement; [0077] (5) the composite core structure was put into the membrane bag; [0078] (6) a bagged composite core structure was put into a vacuum sealing machine; a plate was pressed on the bag to avoid uneven packaging, upper and lower layers of the heat-sealing membranes were flattened, a vacuum chamber cover was put down, and the cover was compacted by vacuumizing; 100791 (7) heat-sealing metal strips were heated; the metal strips conducted heat to the hot-melt adhesive membrane in an inner layer of the membrane, such that the upper and lower layers of the hot-melt adhesive membranes were melted and bonded; [0080] (8) the power was cut off to cool down, the air was released into the vacuum chamber, and the cover was lifted to obtain a porous sealing plate semi-finished product; [0081] (9) a position of the engineering plastic was found on a plane of the porous sealing plate semi-finished product, and heat-sealing was conducted at 150°C and 0.3 MPa on the membrane above the position of the engineering plastic ring, to realize dense bonding between the engineering plastic ring and the membrane by hot-melting; and [0082] (10) the position of the engineering plastic ring was found on a plane of the porous sealing plate semi-finished product, and the membrane was removed from the engineering plastic ring in the semi-finished product; the non-heat-sealed membrane was removed on an outer side of the engineering plastic ring on a periphery of the semi-finished product, an infrared reflective coating was sprayed on an outer surface of the frame to form an infrared reflective coating layer, to obtain a product of the porous sealing plate with circular pores and in a plum blossom shape shown in FIG. 1. The product was applied to thermal insulation of side parts of a pump body with drive shafts, and the seven drive shafts passed through prefabricated inner pores into the porous sealing plate without damaging a plate structure.

[0083] There was a layer of hot-melt adhesive membrane at a connection position between the engineering plastic frame and the membrane to form a composite laminate, where the hot-melt adhesive membrane was a PET adhesive membrane with a membrane thickness of 50 qm.

10084] A thermal conductivity of the porous sealing plate prepared in this example was tested by a core test, and the thermal conductivity was 3 mW/(m.K).

[0085] Example 2

[0086] As shown in FIG. 3, a porous sealing plate with a complex structure had a thickness of 0.02 m, a maximum height of 0.5 m, and a maximum width of 0.3 m; two square stacks at a lower end each had a side length of 0.05 m; a peanut-shaped hole at an upper end had a maximum height of 0.07 m, a maximum width of 0.03 m, and a minimum width of 0.02 m. The porous sealing plate included a frame, a core, a getter, and a membrane, where the frame had a continuous structure and was processed from an engineering plastic, and the engineering plastic was nylon (PA); there were 3 frames, including 1 frame arranged on a periphery of the core, and 2 frames arranged in an inner opening of the core; a main body of the core was a fumed silica inorganic powder, and the core was wrapped by the frame and the membrane; the getter was a CaO composite powder placed inside the core, with a content of 1 wt%; the membrane was an aluminum-plastic composite membrane arranged on upper and lower surfaces of a core plane; the engineering plastic was hot-melt-bonded to the membrane through a hot-pressing technology. [0087] A preparation method included the following steps: [0088] (1) a surface of an engineering plastic plate was sprayed with a hot-melt adhesive material, cured, and processed into 3 engineering plastic rings by cutting; [0089] (2) the core and a membrane bag were dried; [0090] (3) the core was cut, pores were processed in the core, and the core was processed into a specific-shaped structure; [0091] (4) engineering plastic rings of 2 inner frames were embedded into the cut pores of the core, and the core was embedded in an engineering plastic ring of an outer frame to form a composite core structure, followed by conducting position fixing to prevent displacement; [0092] (5) the composite core structure was put into the rectangular membrane bag with one side opening; [0093] (6) a bagged composite core structure was put into a vacuum sealing machine; a plate was pressed on the bag to avoid uneven packaging, upper and lower layers of the heat-sealing membranes were flattened, a vacuum chamber cover was put down, and the cover was compacted by vacuumizing; 100941 (7) heat-sealing metal strips were heated; the metal strips conducted heat to the hot-melt adhesive membrane of the engineering plastic frame, such that two layers of the hot-melt adhesive membranes were melted and bonded between the membrane and the engineering plastic; [0095] (8) the power was cut off to cool down, the air was released into the vacuum chamber, and the cover was lifted to obtain a porous sealing plate semi-finished product; [0096] (9) a position of the engineering plastic was found on a plane of the porous sealing plate semi-finished product, and heat-sealing was conducted at 150°C and 0.4 NIPa on the membrane above the position of the engineering plastic ring, to realize dense bonding between the engineering plastic ring and the membrane by hot-melting; and [0097] (10) the position of the engineering plastic ring was found on a plane of the porous sealing plate semi-finished product, and the membrane was removed from the engineering plastic ring in the semi-finished product; and the membrane was removed on an outer side of the engineering plastic ring around the semi-finished product, to obtain a product of the porous sealing plate with a complex structure shown in FIG. 3. The product was applied to heat preservation and heat insulation of pipe components in coffee machine instruments, and threading pipes and water flow pipes passed through prefabricated inner pores into the porous sealing plate.

[0098] There was a layer of hot-melt adhesive membrane at a connection position between the engineering plastic frame and the membrane to form a composite laminate, where the hot-melt adhesive membrane was a PE adhesive membrane with a membrane thickness of 50 Rm.

[0099] A thermal conductivity of the porous sealing plate prepared in this example was tested by a core test, and the thermal conductivity was 5 mW/(m*K).

101001 Example 3

[0101] As shown in FIG. 4, a porous sealing plate with a complex structure had a thickness of 0.03 m, a maximum height of 0.7 m, a maximum width of 1 m, and a top circle radius of 0.5 m. The porous sealing plate included a frame, a core, a getter, and a membrane, where the frame had a continuous structure, was processed from an engineering plastic, and was arranged on a periphery of the core, and the engineering plastic was polyimide; a main body of the core was centrifugal glass fiber wool, and the core was wrapped by the frame and the membrane; the getter was a CaCh composite powder placed inside the core, with a content of 5 wt%; the membrane was a polyimide composite membrane arranged on a surface of a core plane; the engineering plastic was hot-melt-bonded to the membrane through a hot-pressing technology; an outer surface of the frame was provided with an infrared reflective film layer in a thickness of 0.1 mm.

101021 A preparation method included the following steps: 101031 (1) an engineering plastic plate was processed into an engineering plastic frame by cutting; [0104] (2) the core and a membrane bag were dried; [0105] (3) the core was cut, and the core was processed into a specific-shaped structure; [0106] (4) the core was embedded into an engineering plastic ring to form a composite core structure, followed by conducting position fixing to prevent displacement; 101071 (5) the composite core structure was put into the membrane bag; 101081 (6) a bagged composite core structure was put into a vacuum sealing machine; a plate was pressed on the bag to avoid uneven packaging, upper and lower layers of the heat-sealing membranes were flattened, a vacuum chamber cover was put down, and the cover was compacted by vacuumizing; 101091 (7) heat-sealing metal strips were heated; the metal strips conducted heat to the hot-melt adhesive membrane in an inner layer of the membrane, such that the upper and lower layers of the hot-melt adhesive membranes were melted and bonded; [0110] (8) the power was cut off to cool down, the air was slowly released into the vacuum chamber, and the cover was slowly lifted to obtain a porous sealing plate semi-finished product; [0111] (9) a position of the engineering plastic was found on a plane of the porous sealing plate semi-finished product, and heat-sealing was conducted at 300°C and 0.2 MPa on the membrane above the position of the engineering plastic ring, to realize dense bonding between the engineering plastic ring and the membrane by hot-melting; and [0112] (10) the position of the engineering plastic ring was found on a plane of the porous sealing plate semi-finished product, the non-heat-sealed membrane was removed on an outer side of the ring, and an infrared reflective film was attached to the outer surface of the engineering plastic ring to form an infrared reflective film layer, to obtain a product of the porous sealing plate with a complex structure as shown in FIG. 4. The product was applied to thermal insulation of an inner area of coffee machine instruments, side thermal insulation of rotary vane vacuum pumps, and thermal insulation packaging of new energy vehicle batteries.

[0113] There was a layer of hot-melt adhesive membrane at a connection position between the engineering plastic frame and the membrane to form a composite laminate, where the hot-melt adhesive membrane was a PE adhesive membrane with a membrane thickness of 50 mn.

[0114] A thermal conductivity of the porous sealing plate prepared in this example was tested by a core test, and the thermal conductivity was 1.6 mW/(m -K).

[0115] The above embodiments are only used to help understand the method and the core idea of the present disclosure. It should be pointed out that for those skilled in the art, without departing from the principle of the present disclosure, several improvements and modifications can also be made to the present disclosure, and these improvements and modifications also fall within the protection scope of the claims of the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Thus, the present disclosure is not intended to be limited to the examples shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein

Claims (14)

1. WHAT IS CLAIMED IS: 1. A porous sealing plate, comprising a frame (1), a core (4), a getter (3), and a membrane (2), wherein the getter (3) is arranged inside the core (4), and the core (4) has openings, and is prepared from an inorganic powder and/or a fiber; the frame (1) has a continuous structure, is prepared from an engineering plastic, and is arranged on a periphery of the core (4), or on the openings of the core (4), or on both the periphery and the openings of the core (4); the membrane (2) is an aluminum-plastic composite membrane, a polyimide composite membrane, a metallized membrane, or an inorganic non-metallic coating plastic composite membrane, and wraps a surface of the core (4).
2. 2 The porous sealing plate according to claim 1, wherein the engineering plastic is nylon (polyamide, PA), polytetrafluoroethylene, polycarbonate, polyimide, or polyurethane
3. 3. The porous sealing plate according to claim 1 or 2, wherein an inner surface and/or an outer surface of the frame (1) further comprises an infrared reflective coating layer and/or an infrared reflective film layer.
4. 4. The porous sealing plate according to claim 1, wherein the getter is a CaO composite powder and/or a CaCk composite powder.
5. 5. The porous sealing plate according to claim 1 or 4, wherein the getter has a particle size of 1 pm to 100 pm.
6. 6. The porous sealing plate according to claim 4, wherein in the CaO composite powder and the CaC12 composite powder, a composite powder is independently one or more selected from the group consisting of a zirconium-aluminum 16 getter, a zirconium-graphite getter, a zirconium-nickel getter, and a zirconium-iron-vanadium getter.
7. 7 The porous sealing plate according to claim 1, wherein a hot-melt adhesive membrane prepared from the membrane or the engineering plastic by hot-melting is further provided between the frame (1) and the membrane (2).
8. 8. The porous sealing plate according to claim 7, wherein the hot-melt adhesive membrane has a membrane thickness of 30 pm to 100 pm, and is prepared from a polyethylene (PE) membrane, a polyethylene-polyvinyl acetate copolymer (EVA) adhesive membrane, a polyethylene terephthalate (PET) adhesive membrane, a PA66 adhesive membrane, a polyolefin (PO) adhesive membrane, or a thermoplastic polyurethane (TPU) adhesive membrane.
9. 9. The porous sealing plate according to claim 1, wherein the core (4) has 30% to 80 of the inorganic powder by mass fraction
10. 10. The porous sealing plate according to claim 1 or 9, wherein the inorganic powder is a silica nano-powder, a mixture of silica and glass fiber, a mixture of fumed silica and microsilica, a mixture of the fumed silica and volcanic ash, a mixture of the fumed silica and a marble powder, or a mixture of the fumed silica and a slag powder.
11. 11. The porous sealing plate according to claim 1, wherein the fiber is selected from the group consisting of flame glass wool and centrifugal glass wool.
12. 12. The porous sealing plate according to claim 1 or 11, wherein the core (4) has 15 wt% to 69 wt% of the fiber.
13. 13. A preparation method of the porous sealing plate according to any one of claims 1 to 12, comprising the following steps: processing an engineering plastic plate into the frame (1) by cutting; embedding the frame (1) and the core (4) to form a composite core structure; loading the composite core structure into the membrane (2), and conducting encapsulation to obtain a sealing plate semi-finished product; and heat-sealing a surface of the sealing plate semi-finished product, and removing the engineering plastic inside the core (4) and the membrane that is not heat-sealed on an outer surface of the frame (1) to obtain the porous sealing plate.
14. 14. The preparation method according to claim 13, wherein the heat-sealing is conducted at 100°C to 500°C and 0.1 1\413a to 0 51\4Pa