CN113251243A - Film material for vacuum insulation panel, vacuum insulation panel and preparation method of vacuum insulation panel - Google Patents
Film material for vacuum insulation panel, vacuum insulation panel and preparation method of vacuum insulation panel Download PDFInfo
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- CN113251243A CN113251243A CN202110482732.9A CN202110482732A CN113251243A CN 113251243 A CN113251243 A CN 113251243A CN 202110482732 A CN202110482732 A CN 202110482732A CN 113251243 A CN113251243 A CN 113251243A
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Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L59/00—Thermal insulation in general
- F16L59/02—Shape or form of insulating materials, with or without coverings integral with the insulating materials
- F16L59/029—Shape or form of insulating materials, with or without coverings integral with the insulating materials layered
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B31/00—Packaging articles or materials under special atmospheric or gaseous conditions; Adding propellants to aerosol containers
- B65B31/04—Evacuating, pressurising or gasifying filled containers or wrappers by means of nozzles through which air or other gas, e.g. an inert gas, is withdrawn or supplied
- B65B31/06—Evacuating, pressurising or gasifying filled containers or wrappers by means of nozzles through which air or other gas, e.g. an inert gas, is withdrawn or supplied the nozzle being arranged for insertion into, and withdrawal from, the mouth of a filled container and operating in conjunction with means for sealing the container mouth
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B51/00—Devices for, or methods of, sealing or securing package folds or closures; Devices for gathering or twisting wrappers, or necks of bags
- B65B51/10—Applying or generating heat or pressure or combinations thereof
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L59/00—Thermal insulation in general
- F16L59/02—Shape or form of insulating materials, with or without coverings integral with the insulating materials
- F16L59/028—Composition or method of fixing a thermally insulating material
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L59/00—Thermal insulation in general
- F16L59/06—Arrangements using an air layer or vacuum
- F16L59/065—Arrangements using an air layer or vacuum using vacuum
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L59/00—Thermal insulation in general
- F16L59/08—Means for preventing radiation, e.g. with metal foil
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B51/00—Devices for, or methods of, sealing or securing package folds or closures; Devices for gathering or twisting wrappers, or necks of bags
- B65B51/10—Applying or generating heat or pressure or combinations thereof
- B65B2051/105—Heat seal temperature control
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Laminated Bodies (AREA)
Abstract
The invention relates to the field of vacuum insulation, and particularly discloses a membrane material for a vacuum insulation panel, the vacuum insulation panel and a preparation method thereof, wherein the preparation method comprises the following steps: a heat-seal layer and a gas barrier layer formed on the heat-seal layer; the material of the heat sealing layer is selected from any one or a combination of two of modified polyamide, polyimide, polyphenylene sulfide, polyether ether ketone, polyamide imide, polyphenylene sulfone, polyether sulfone and polysulfone; the material of the gas barrier layer is selected from any one of metal aluminum foil, copper foil and silver foil. The material with the melting point of more than 200 ℃ is selected as the material of the heat sealing layer and the metal foil is selected as the material of the gas barrier layer, so that the high-temperature resistance of the film material is greatly improved, the vacuum heat-insulating plate has excellent heat-insulating performance in a high-temperature environment, and the application limit of the traditional vacuum heat-insulating plate only in a low-temperature scene is broken.
Description
Technical Field
The invention relates to the field of vacuum insulation, and particularly discloses a membrane material for a vacuum insulation panel, the vacuum insulation panel and a preparation method of the vacuum insulation panel.
Background
In the field of heat preservation and insulation materials, at present, a Vacuum Insulation Panel (VIP) has an extremely low heat conductivity coefficient which is less than 4mW/mK at normal temperature, and is the most excellent material with heat preservation and insulation performance in wide application at present.
Current vacuum insulation panels mainly comprise: the vacuum heat-insulation plate generally adopts a heat-sealing process, heat sealing is realized in the vacuumizing process, the heat-sealing layer of the traditional film material generally adopts PE, PP, EVA, PVC and other plastic films, so that the existing VIP film material cannot resist high temperature (suitable for the environment with the temperature less than 75 ℃), the VIP product can only be applied to heat preservation and heat insulation in low-temperature environments such as a refrigerator, a freezer and the like, and cannot be used in a high-temperature environment (more than 100 ℃), the sealing property of the film material is easily damaged in the high-temperature environment, the original heat preservation and heat insulation effect can be lost instantly, and the application range of the VIP product is greatly limited.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, the above-mentioned technical problems in the related art. Therefore, the invention provides a film material for a vacuum insulation panel, the vacuum insulation panel and a preparation method thereof, and solves at least one technical problem.
In order to achieve the above object, a first aspect of the present invention provides a film material for a vacuum insulation panel, comprising: a heat-seal layer and a gas barrier layer formed on the heat-seal layer; the material of the heat sealing layer is selected from any one or a combination of two of modified polyamide, polyimide, polyphenylene sulfide, polyether ether ketone, polyamide imide, polyphenylene sulfone, polyether sulfone and polysulfone; the material of the gas barrier layer is selected from any one of metal aluminum foil, copper foil and silver foil.
The invention provides a vacuum insulation panel, which comprises a getter, a composite core material and the film material, wherein the film material is bag-shaped, and the getter and the composite core material are vacuum-packaged in the film material.
The third aspect of the invention provides a preparation method of a vacuum insulation panel, which comprises the following steps:
making a film material into a film material bag, wherein the heat sealing layer is used as the inner surface of the film material bag;
and filling the composite core material into the film material bag, vacuumizing, and then sealing the composite core material in the film material bag in a vacuum manner through a hot pressing process.
In addition, the film material for the vacuum insulation panel of the present invention may further have the following additional technical features:
according to an embodiment of the present invention, further comprising a heat blocking layer formed on the gas blocking layer.
According to an embodiment of the present invention, the material of the thermal barrier layer is selected from any one or a combination of two of polyimide, polyetheretherketone, polyphenylene sulfide, polytetrafluoroethylene, liquid crystal polymer, polyamide, polyimide, polyamide imide, polyphenylene sulfone, polyethersulfone and polysulfone. The heat-resistant layer is preferably a thermosetting Polyimide (PI) film, and is characterized by high temperature resistance, long-term use temperature of more than 380 ℃ and extremely low thermal expansion coefficient (less than 0.1%), so that when the PI is used as the heat-resistant layer in a film material, the PI is heated and pressed and is not easy to deform, the film material at a sealing position is not easy to wrinkle, and the sealing quality is ensured.
According to one embodiment of the invention, the heat-seal layer, the gas barrier layer and the heat-resistant layer are 1-2000um thick, glue layers are arranged between the heat-seal layer and the gas barrier layer and between the gas barrier layer and the heat-resistant layer, and the thickness of each glue layer is 1-2000 um.
According to an embodiment of the present invention, the material of the heat-sealing layer is selected from any one of polyetherimide, polyphenylene sulfone, polyimide and polyamide-imide, and the thickness of the heat-sealing layer is 20-200 um.
According to one embodiment of the invention, the thickness of the heat-seal layer is 30-80 um.
According to one embodiment of the invention, the heat-seal layer has a thickness of 50 um.
According to one embodiment of the invention, the membrane material is provided with a seal folding edge surrounding the core material, and the distance between the inner periphery of the seal folding edge and the outer periphery of the core material is more than or equal to 10 mm.
According to one embodiment of the invention, the material of the heat sealing layer is selected from Polyamide (PA), the hot pressing temperature is 200-250 ℃, the hot pressing pressure is 0.2-1MPa, and the hot pressing time is 15-25 s.
According to one embodiment of the invention, the material of the heat sealing layer is selected from polyetherimide, the temperature of the hot pressing is 215-255 ℃, the pressure of the hot pressing is 0.2-1MPa, and the time of the hot pressing is 15-25 s.
According to one embodiment of the present invention, the material of the heat sealing layer is selected from polyphenylene sulfone, the temperature of the hot pressing is 220-260 ℃, the pressure of the hot pressing is 0.2-1MPa, and the time of the hot pressing is 15-25 s.
According to an embodiment of the invention, the material of the heat sealing layer is selected from polyamide-imide, the hot pressing temperature is 255-295 ℃, the hot pressing pressure is 0.2-1MPa, and the hot pressing time is 15-25 s.
According to an embodiment of the invention, the material of the heat sealing layer is selected from polyimide, the hot pressing temperature is 300-360 ℃, the hot pressing pressure is 0.2-1MPa, and the hot pressing time is 15-25 s.
Compared with the prior art, the invention has the following beneficial effects:
the material with the melting point of more than or equal to 200 ℃ is selected as the material of the heat sealing layer and the metal foil is used as the material of the gas barrier layer, so that the high-temperature resistance of the film material is greatly improved, the vacuum heat-insulating plate has excellent heat-insulating performance in a high-temperature environment, and the application limit of the traditional vacuum heat-insulating plate only in a low-temperature scene is broken.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic view of a vacuum insulation panel attached to a top plate of a cooking chamber according to an embodiment of the present invention;
FIG. 2 is a schematic view of a vacuum insulation panel secured to an enclosure according to an embodiment of the present invention;
FIG. 3 is a schematic view of a vacuum insulation panel according to an embodiment of the present invention;
FIG. 4 is a schematic structural view of the film of FIG. 3;
FIG. 5 is a cross-sectional view of FIG. 3;
FIG. 6 is a schematic view of a folded vacuum insulation panel seal edge according to an embodiment of the present invention;
fig. 7 is a schematic structural view of a composite core in one embodiment of the present invention.
The reference numbers are as follows:
the heating device comprises a cooking appliance 100, a cooking cavity 1, a furnace door 2, a heating tube 3, a transition structure 4, an outer cover 5, a vacuum insulation board 6, a film material 60, a composite core material 61, inorganic fiber cotton 611, an infrared opacifier 612, a getter 62, a heat sealing layer 63, a gas barrier layer 64, a heat barrier layer 65, a glue layer 66, a seal folding edge 67 and a connecting piece 68.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprising," "including," and "having" are inclusive and therefore specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof.
In the description of the present invention, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be construed broadly, e.g., as meaning a fixed connection, a detachable connection, or an integral connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first", "second", may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
For convenience of description, spatially relative terms, such as "bottom," "front," "upper," "oblique," "lower," "top," "inner," "horizontal," "outer," and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. This spatially relative relationship is intended to encompass different orientations of the mechanism in use or operation in addition to the orientation depicted in the figures. For example, if the mechanism in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the example term "below … …" can include both an orientation of above and below.
The Vacuum Insulated Panel (VIP) is one of vacuum heat-insulating materials, is formed by compounding a filling core material and a vacuum protection surface layer, and effectively avoids heat transfer caused by air convection, so that the heat conductivity coefficient can be greatly reduced to 0.002-0.004w/m.k, which is 1/10 of the heat conductivity coefficient of the traditional heat-insulating material, and the vacuum insulated panel is a solid material with the lowest heat conductivity coefficient at present, has excellent heat-insulating effect, and has a great amount of applications in the cold-insulating and building industries.
The existing vacuum insulation panel is generally used in the low-temperature cold insulation industry, and is usually used in a refrigerator, and the long-term use temperature is not more than 75 ℃, but when the use temperature exceeds 100 ℃, for example, when the vacuum insulation panel is applied in an electric oven, low-density polyethylene (PE-LD) used as a heat sealing layer in a film material and polyethylene terephthalate (PET) used as a supporting and heat-blocking material are not resistant to heat, so that the sealing property at the sealing position of the film material is damaged, the vacuum degree of the vacuum insulation panel is damaged, the heat conductivity coefficient is increased, and the heat insulation performance of a product is rapidly reduced, so that a vacuum insulation panel which maintains excellent heat insulation performance in a high-temperature environment (more than 100 ℃) is urgently needed to be provided.
Referring to fig. 1-2, some embodiments of the present invention provide a cooking appliance 100, specifically, the cooking appliance 100 in the embodiment may be an electric oven, and of course, the cooking appliance 100 in the embodiment may also be a microwave oven, a steam oven, and the like, which is not limited herein.
The cooking appliance 100 includes: cooking cavity 1, furnace gate 2 and heating tube 3 etc.. Wherein the cooking cavity 1 has a top plate, a bottom plate, left and right side plates, and a back plate made of a heat conductive material such as cast aluminum. Which is opposite the oven door 2 in the closed position. The cooking cavity 1 including the back plate is an integrated structure formed by die casting cast aluminum, so that the cooking cavity has high rigidity and good heat conduction performance. Particularly, the structure is integrated, so that dead corners caused by the connection part can be avoided, the full cleaning is convenient, and the cooking sanitation is ensured.
The cooking cavity 1 is provided with an opening for taking and placing food, typically on the side facing the user. The oven door 2 is movable between an open position and a closed position to close or open the opening. Wherein, in the closed position, the oven door 2 defines with the cooking cavity 1 a cooking chamber; in the open position, a user may place food in the cooking chamber through the opening.
In the illustrated preferred embodiment, the left and right side plates are respectively formed with heat pipe slots recessed toward the cooking chamber, and the heat pipes 3 are disposed in the heat pipe slots and can transfer heat to the cooking chamber and the food therein through the cooking cavity 1 (i.e., the top plate, the bottom plate, the left and right side plates, etc. thereof).
In the present embodiment, the heating pipes 3 on the left side plate and the right side plate are used as heat sources to heat the electric oven, but the present embodiment is not limited thereto, and the electric oven may be heated by blowing hot air from the back, and the heating method of the electric oven is not particularly limited in the present embodiment.
Can learn, the heat radiation that heating tube 3 produced is to culinary art cavity 1, and then has the temperature that basically the same everywhere at whole culinary art cavity 1 to food in the even heating culinary art cavity avoids being heated the roast burnt or carbonization problem that the inequality leads to. In addition, the heating tube 3 is arranged outside the cooking cavity, so that the heating tube is not influenced by water vapor and oil smoke in the baking process, and the heating tube has the advantages of safety, reliability and the like. Especially, through forming the heating pipe groove that holds heating tube 3, can avoid heating tube 3 to occupy the too much space in culinary art cavity 1 outside, be convenient for like the arrangement of control element, thermal-insulated component etc. avoid from leading to the too big scheduling problem of volume because of heating tube 3 is external to can improve heating tube 3 to the heat conduction efficiency of culinary art cavity 1.
In the present invention, since the heat generated from the heat generating pipe 3 is not directly radiated to the food, but is uniformly heated after passing through the cooking cavity 1, the food can be uniformly baked. For this purpose, the heating tubes may be arranged on the top plate, the bottom plate or on the top plate, the bottom plate, the left side plate and the right side plate, for example, heat-emitting tube slots are formed on the top plate, the bottom plate or on the top plate, the bottom plate, the left side plate and the right side plate, and the number of the heating tubes 3 may be set to match according to the required oven power and the power of the single heating tube 3.
The heating tube adopted by the embodiment can be a stainless steel heating tube or a quartz heating tube and is properly arranged according to the requirement. The heat generating tube 3 is generally in the shape of a bar having a cylindrical cross section so as to be connected to a power source at an end portion. Wherein, in order to fully utilize the heat generated by the heating tube 3, the heating tube 3 can be arranged in parallel with the wall surface of the corresponding cooking cavity 1. For example, the heating tubes 3 in the heating tube slots are arranged in a vertical direction corresponding to the vertically arranged left and right side plates, so that the heat generated by the tube sections of the heating tubes 3 can be transferred to the left and right side plates to a greater extent, thereby improving the cooking efficiency.
As other embodiments of the present invention, the portions of the top plate, the bottom plate, the left side plate, the right side plate and the back plate, which meet each other, may be formed as the arc-shaped transition structures 4. For example, an arc-shaped transition structure 4 is formed at a position where the left side plate meets the top and bottom plates, thereby having better die-casting manufacturability and enabling easy cleaning.
It should be noted that the electric oven in this embodiment may also be provided with other auxiliary functional components or structures. Referring to fig. 2, the electric oven is provided with an outer cover 5 covering the outside of the cooking cavity 1, and the outer cover 5 can isolate the cooking cavity 1 to prevent scalding caused by accidental contact.
A control panel can be arranged corresponding to one side of the oven door 2, and the control panel is provided with a knob, a button, a display screen and the like so as to control or display parameters and states of the electric oven such as start-stop, heating temperature and the like.
It should be noted that the electric oven of the present invention may further have a temperature controller (not shown) for controlling the power-on state or heating power of the heating tube 3 according to the temperature in the cooking chamber, so as to bake the food in the cooking chamber at a proper temperature.
In an embodiment of the present invention, with continued reference to fig. 1-2, the electric oven further comprises a vacuum insulation panel 6 disposed between the cooking cavity and the housing 5, wherein the vacuum insulation panel 6 may be bonded on an outer top surface of a top plate of the cooking cavity or bonded on an inner top surface of the housing 5, and the vacuum insulation panel 6 may be bonded and fixed by a high temperature resistant glue, specifically, the high temperature resistant glue may be a high temperature epoxy structural adhesive, a silicone pressure sensitive adhesive, or the like.
Note that, in the present embodiment, as shown in fig. 3, the vacuum insulation panel 6 includes: a bag-shaped film 60, a composite core 61 vacuum-sealed in the film 60, and a getter 62; the getter 62 is sealed inside the film material 60 together with the composite core material 61, and the getter 62 absorbs residual oxygen released from the film material 60 and the composite core material 61 during use, thereby ensuring the degree of vacuum in the vacuum insulation panel 6.
In this embodiment, as shown in fig. 4, the film 60 may include: the composite core material comprises a heat sealing layer 63, a gas barrier layer 64 and a heat barrier layer 65 which are arranged in a stacked mode, wherein the heat sealing layer 63 is arranged close to the surface of the composite core material 61, an adhesive layer 66 is arranged between the heat sealing layer 63 and the gas barrier layer 64, the adhesive layer 66 is arranged between the heat barrier layer 65 and the gas barrier layer 64, the melting point of the heat sealing layer 63 is larger than 200 ℃, and the material of the gas barrier layer 64 is metal foil to improve the radiation protection and barrier capability of the membrane material 60.
Specifically, the heat-seal layer 63, the gas barrier layer 64, and the heat-barrier layer 65 may have a thickness of 1 to 2000um, and each of the adhesive layers 66 may have a thickness of 1 to 2000 um. Wherein, the thickness of the heat-sealing layer 63 is preferably 50um, the thickness of the gas barrier layer 64 is preferably 7um, the thickness of the heat-resistant layer 65 is preferably 25um, and the thickness of the glue layer 66 is preferably 2 um.
Further, in some embodiments of the present invention, the heat sealing layer 63 may be a thermoplastic film that can resist high temperature of 200 ℃ or higher, for example, the material of the heat sealing layer 63 may be selected from any one or a combination of two of modified Polyamide (PA), thermoplastic Polyimide (PEI), thermoplastic Polyimide (PI), thermoplastic polyphenylene sulfide (PPS), thermoplastic polyether ether ketone (PEEK), thermoplastic polyamide imide (PAI), thermoplastic polyphenylene sulfone (PPSU), thermoplastic polyether sulfone (PES), thermoplastic Polysulfone (PSU), and other high temperature resistant thermoplastic materials; the material of the gas barrier layer 64 may be any one selected from a metal aluminum foil, a copper foil, and a silver foil, the heat barrier layer 65 may be an engineering plastic film with a high temperature resistance of 200 ℃ or higher, and for example, the material of the heat barrier layer 65 may be any one or a combination of any two selected from a high temperature resistant thermoplastic material such as Polyimide (PI), Polyetheretherketone (PEEK), polyphenylene sulfide (PPS), Polytetrafluoroethylene (PTFE), Liquid Crystal Polymer (LCP), Polyamide (PA), Polyimide (PEI), polyamide imide (PAI), polyphenylsulfone (PPSU), Polyethersulfone (PES), and thermoplastic Polysulfone (PSU).
Specifically, the vacuum insulation panel 6 can be manufactured by the following process, firstly, a bagged film material is manufactured, a film covering mode of a food packaging bag is adopted, a heat sealing layer 63, a gas barrier layer 64 and a heat barrier layer 65 are sequentially bonded by glue, the bonded heat sealing layer 63 is pressurized and heated to form a sealing edge through heat sealing equipment, finally, the film material 60 with at least one opening is manufactured, then, a getter 62 and a composite core material 61 subjected to high-temperature drying and dehumidifying treatment are filled into the film material 60, the moisture content of inorganic fiber cotton is ensured to be lower than 0.5%, vacuumizing is performed, and finally, the opening of the film material 60 is subjected to heat sealing treatment.
In one embodiment of the present invention, the heat-sealing layer 63 may be selected from Polyamide (PA), and conventional nylon films have a high degree of orientation of polymer molecules due to longitudinal and transverse stretching, and thus have poor heat-sealing performance, so that the present invention can obtain a heat-sealing layer with good heat-sealing performance by using a nylon film with low crystallinity and high transparency as the heat-sealing layer.
Specifically, the melting point of PA is more than 230 ℃, and a good heat sealing effect is achieved by controlling the thickness of the film and selecting reasonable heat sealing time, heat sealing pressure and heat sealing temperature. The thickness of the heat sealing layer 63 is between 20 and 200um, when the thickness of the heat sealing layer 63 is between 30 and 80um, the heat sealing effect is optimal, and the thickness of the heat sealing layer 63 influences the heat sealing time; the heat sealing temperature of the heat sealing layer 63 is more than 200 ℃, different temperatures can influence the heat sealing strength of the film, and the typical value of the heat sealing temperature is 200-250 ℃; the heat sealing pressure of the heat sealing layer 63 is between 0.2 and 1MPa, the sealing is not firm due to insufficient pressure, the edge melting is easy to occur due to too large pressure, the sealing strength is also influenced, and the typical value of the heat sealing pressure is 0.5 MPa; the heat-sealing time of the heat-sealing layer 63 is 0.5-30s, and the heat-sealing strength of the film material is affected by too long or too short heat-sealing time, and the typical value of the heat-sealing time is 15-25 s.
When the thicknesses of the films are different, the heat-sealing temperature, the heat-sealing time and the heat-sealing pressure need to be properly adjusted to achieve the optimal heat-sealing strength, and when the thickness of the heat-sealing layer 63 is 50um, the relationship between the heat-sealing temperature, the heat-sealing time, the heat-sealing pressure and the heat-sealing strength is shown in the following table 1:
table 1: relationship between heat-seal temperature, heat-seal time, heat-seal pressure and heat-seal strength of the heat-seal layer 63
As can be seen from Table 1, when the heat-seal layer 63 had a thickness of 50 μm, the highest heat-seal strength of 48N/15m could be achieved by selecting a heat-seal temperature of 225 deg.C, a heat-seal pressure of 0.5PMa and a heat-seal time of 25 s.
In one embodiment of the present invention, the heat sealing layer 63 may be selected from Polyetherimide (PEI), which has excellent temperature resistance and is widely used in the fields of aerospace, electronic appliances, automobile home, and the like. PEI is a high-temperature amorphous thermoplastic material and has good heat sealing performance.
Specifically, the glass transition temperature of PEI is more than or equal to 215 ℃, and a good heat sealing effect is achieved by controlling the thickness of the film and selecting reasonable heat sealing time, heat sealing pressure and heat sealing temperature. The thickness of the heat sealing layer 63 is between 20 and 200um, when the thickness of the heat sealing layer 63 is between 30 and 80um, the heat sealing effect is optimal, and the thickness of the heat sealing layer 63 influences the heat sealing time; the heat sealing temperature of the heat sealing layer 63 is higher than 210 ℃, different temperatures can influence the heat sealing strength of the film, and the typical value of the heat sealing temperature is 215-255 ℃; the heat sealing pressure of the heat sealing layer 63 is between 0.2 and 1MPa, the sealing is not firm due to insufficient pressure, the edge melting is easy to occur due to too large pressure, the sealing strength is also influenced, and the typical value of the heat sealing pressure is 0.5 MPa; the heat-sealing time of the heat-sealing layer 63 is 0.5-30s, and the heat-sealing strength of the film material is affected by too long or too short heat-sealing time, and the typical value of the heat-sealing time is 15-25 s.
When the thicknesses of the films are different, the heat-sealing temperature, the heat-sealing time and the heat-sealing pressure need to be properly adjusted to achieve the optimal heat-sealing strength, and when the thickness of the heat-sealing layer 63 is 50um, the relationship between the heat-sealing temperature, the heat-sealing time, the heat-sealing pressure and the heat-sealing strength is shown in the following table 2:
table 2: relationship between heat-seal temperature, heat-seal time, heat-seal pressure and heat-seal strength of the heat-seal layer 63
As can be seen from Table 2, when the heat-seal layer 63 had a thickness of 50 μm, the highest heat-seal strength of 55N/15m could be achieved by selecting a heat-seal temperature of 255 deg.C, a heat-seal pressure of 0.5PMa and a heat-seal time of 25 s.
In another embodiment of the present invention, the heat sealing layer 63 may be made of polyphenylene sulfone (PPSU), which has excellent temperature resistance and is widely used in the fields of medical treatment, electronic appliances, and food appliances. The PPSU is amorphous thermoplast, is high in transparency and has good heat sealing performance.
The glass transition temperature of the heat sealing layer 63 is more than or equal to 200 ℃, and a good heat sealing effect is achieved by controlling the thickness of the film and selecting reasonable heat sealing time, heat sealing pressure and heat sealing temperature. Specifically, the thickness of the heat-sealing layer 63 is between 20 and 200um, when the film thickness is between 30 and 80um, the heat-sealing effect is optimal, and the thickness of the heat-sealing layer 63 influences the heat-sealing time; the heat sealing temperature of the heat sealing layer 63 is higher than 220 ℃, different temperatures can influence the heat sealing strength of the film, and the typical value of the heat sealing temperature is 220-260 ℃; the heat sealing pressure of the heat sealing layer 63 is between 0.1 and 0.5MPa, the sealing is not firm due to insufficient pressure, the edge melting is easy to occur due to too large pressure, the sealing strength is also influenced, and the typical value of the heat sealing pressure is between 0.2 and 1 MPa; the heat-sealing time of the heat-sealing layer 63 is 0.5-30s, and the heat-sealing strength of the film material is affected by too long or too short heat-sealing time, and the typical value of the heat-sealing time is 15-25 s.
When the thicknesses of the films are different, the heat-sealing temperature, the heat-sealing time and the heat-sealing pressure need to be properly adjusted to achieve the optimal heat-sealing strength, and when the thickness of the heat-sealing layer 63 is 50um, the relationship between the heat-sealing temperature, the heat-sealing time, the heat-sealing pressure and the heat-sealing strength is shown in the following table 3:
table 3: relationship between heat-seal temperature, heat-seal time, heat-seal pressure and heat-seal strength of the heat-seal layer 63
As can be seen from Table 3, when the heat-seal layer 63 had a thickness of 50 μm, the highest heat-seal strength of 65N/m could be achieved by selecting a heat-seal temperature of 240 deg.C, a heat-seal pressure of 0.5PMa and a heat-seal time of 15 s.
In another embodiment of the present invention, the heat-sealing layer 63 may be polyamide imide (PAI), which has excellent high temperature resistance and is widely used in aerospace, microelectronics, and precision mechanical packaging. PAI is an amorphous thermoplastic film that exhibits heat sealability under certain temperature and pressure conditions.
Specifically, the glass transition temperature of the heat-sealing layer 63 is higher than 220 ℃, and a good heat-sealing effect is achieved by controlling the thickness of the film and selecting reasonable heat-sealing time, heat-sealing pressure and heat-sealing temperature. The thickness of the heat sealing layer 63 is between 20 and 200 microns, when the thickness of the film is between 30 and 80 microns, the heat sealing effect is optimal, and the thickness of the heat sealing layer 63 influences the heat sealing time; the heat sealing temperature of the heat sealing layer 63 is higher than 255 ℃, different temperatures can influence the heat sealing strength of the film material, and the typical value of the heat sealing temperature is 255-295 ℃; the heat sealing pressure of the heat sealing layer 63 is between 0.1 and 0.5MPa, the sealing is not firm due to insufficient pressure, the edge melting is easy to occur due to too large pressure, the sealing strength is also influenced, and the typical value of the heat sealing pressure is between 0.2 and 1 MPa; the heat-sealing time of the heat-sealing layer 63 is 0.5-30s, and the heat-sealing strength of the film material is affected by too long or too short heat-sealing time, and the typical value of the heat-sealing time is 15-25 s.
When the thicknesses of the films are different, the heat-sealing temperature, the heat-sealing time and the heat-sealing pressure need to be properly adjusted to achieve the optimal heat-sealing strength, and when the thickness of the heat-sealing layer 63 is 50um, the relationship between the heat-sealing temperature, the heat-sealing time, the heat-sealing pressure and the heat-sealing strength is shown in the following table 4:
table 4: relationship between heat-seal temperature, heat-seal time, heat-seal pressure and heat-seal strength of the heat-seal layer 63
As can be seen from Table 4, when the heat-seal layer 63 had a thickness of 50 μm, the heat-seal temperature of 275 ℃ and the heat-seal pressure of 0.5PMa and the heat-seal time of 25s were selected to achieve the highest heat-seal strength of 65N/15 mm.
In another embodiment of the present invention, the heat sealing layer 63 may be selected from Polyimide (PI), which has excellent high temperature resistance and is widely used in aerospace, microelectronics, and precision mechanical packaging. The traditional PI film belongs to thermosetting materials, the melting temperature of the PI film is higher than the decomposition temperature, and heat sealing can not be realized. The embodiment of the invention selects the amorphous thermoplastic PI film, and the flexible molecular chain is obtained through isomerization structure modification, so that the film has heat sealing property.
Specifically, the glass transition temperature of the Polyimide (PI) is more than 230 ℃, and a good heat sealing effect is achieved by controlling the thickness of the film and selecting reasonable heat sealing time, heat sealing pressure and heat sealing temperature. The thickness of the heat sealing layer 63 is 20-200um, when the film thickness is 30-80um, the heat sealing effect is optimal, and the PI film thickness influences the heat sealing time; the heat sealing temperature of the heat sealing layer 63 is more than 300 ℃, different temperatures can influence the heat sealing strength of the film material, and the typical value of the heat sealing temperature is 300-360 ℃; the heat sealing pressure of the heat sealing layer 63 is 0.1-0.5MPa, the sealing is not firm due to insufficient pressure, the edge melting is easy to occur due to too large pressure, the sealing strength is also influenced, and the typical value of the heat sealing pressure is 0.2-0.5 MPa; the heat sealing time of the heat sealing layer 63 is 0.5-30s, the heat sealing strength of the film material can be affected by too long or too short heat sealing time, and the typical value of the heat sealing time is 15-25 s.
When the thicknesses of the films are different, the heat-sealing temperature, the heat-sealing time and the heat-sealing pressure need to be properly adjusted to achieve the optimal heat-sealing strength, and when the thickness of the heat-sealing layer 63 is 50um, the relationship between the heat-sealing temperature, the heat-sealing time, the heat-sealing pressure and the heat-sealing strength is shown in the following table 5:
table 5: relationship between heat-seal temperature, heat-seal time, heat-seal pressure and heat-seal strength of the heat-seal layer 63
As can be seen from Table 5, when the heat-seal layer 63 had a thickness of 50 μm, the highest heat-seal strength of 63N/15mm could be achieved by selecting a heat-seal temperature of 330 ℃ and a heat-seal pressure of 0.5PMa and a heat-seal time of 25 s.
It should be noted that the above application examples are only for explaining and explaining that five materials are applied to the heat-seal layer 63, but the present embodiment is not limited thereto, and those skilled in the art can flexibly select the materials for the heat-seal layer 63, the gas barrier layer 64, and the heat barrier layer 65 according to the needs.
In this embodiment, as shown in fig. 5, the composite core 61 may be a square block structure, and accordingly, the film 60 may be a square, the composite core 61 is located at the middle of the film 60, the getter 62 is located at the corner of the composite core 61, the film 60 includes a sealing flange 67 formed around the outer periphery of the composite core 61, and the sealing flange 67 is a sealing portion formed on the film 60 by performing a hot pressing process on the film 60.
It is worth mentioning that in the process of selecting the material of the heat-sealing layer 63, the material of the heat-sealing layer 63 generally selected must be resistant to temperature higher than the use temperature, so that the vacuum heat-insulating plate can be assembled on the cooking appliance according to a conventional assembly mode. However, if the material selected for the heat-sealing layer 63 is resistant to temperatures lower than the use temperature, a certain distance d needs to be kept between the inner periphery of the seal flange 67 and the outer periphery of the composite core 61, where d is greater than or equal to 10 mm.
Further, as shown in fig. 6, the sealing flange 67 can be folded toward the same face of the vacuum insulation panel, and the sealing flanges 67 are connected to each other by a connector 68 to fix the sealing flange 67 to the same face of the vacuum insulation panel 6. Specifically, the vacuum insulation panel 6 has an adhesive surface and a non-adhesive surface, wherein the adhesive surface is used for being adhered and fixed to the outer top surface of the top plate or to the inner top surface of the outer cover 5, that is, the adhesive surface is the surface of the vacuum insulation panel 6 close to the heating tube 3 of the cooking appliance 100, and the non-adhesive surface is the surface far away from the heating tube of the cooking appliance 100, it should be noted that the sealing folded edge 67 is folded and fixed to the non-adhesive surface, specifically, the temperature of the non-adhesive surface is higher than that of the non-adhesive surface, so that the sealing folded edge 67 can be kept in a relatively low temperature environment, and thus the working temperature of the vacuum insulation panel mainly depends on the temperature resistance degree of the heat resistance layer 65, for example, the material of the heat resistance layer 65 is selected from Polyimide (PI), and heat insulation can be performed in a high temperature environment of not higher than 380 ℃ for a long time.
In addition, in order to ensure that the seal flap 67 remains flat on the non-adhesive surface after being folded over, a high-temperature adhesive tape may be used as the connecting member 68 to wind the seal flap 67 flat on the non-adhesive surface.
Further, the getter 62 can employ conventional metals and alloys thereof, such as group IIA metals (barium, strontium, magnesium, calcium) and alloys thereof, group IVB metals (titanium, zirconium, hafnium), thorium, rare earth metals and alloys thereof.
It is worth mentioning that in the vacuum environment of the vacuum insulation panel, the thermal conductivity coefficient of the material of the composite core material mainly comprises two aspects of material thermal conductivity and thermal radiation because of no thermal convection. Under the high temperature condition, radiation heat transfer replaces material heat conduction to become the main influence factor of thermal conductivity, so the heat preservation and heat insulation capability of the core material under the high temperature environment is improved, and the heat contribution of radiation heat transfer is required to be reduced. The composite core material 61 of the conventional vacuum insulation panel is mainly made of glass fiber cotton, polyurethane foam, XPS extruded sheet, aerogel felt, etc., and although these materials have a low thermal conductivity coefficient at normal temperature, the thermal conductivity coefficient of the composite core material 61 rises rapidly at a high temperature, for example, at a temperature higher than 200 ℃, and the thermal insulation performance is reduced, so that the vacuum insulation panel cannot be applied to the high-temperature environment of an electric oven. Based on the problems of the conventional composite core material 61, as shown in fig. 7, the composite core material 61 proposed in this embodiment includes a reticular inorganic fiber cotton 611, a binder, and an infrared opacifier 612, wherein the reticular inorganic fiber cotton 611 is composed of a plurality of inorganic fiber filaments, and the infrared opacifier is attached to the inorganic fiber filaments through the binder. Namely, the infrared opacifier 612 is attached to the inorganic fiber cotton 611 framework through the adhesive. Specifically, the infrared opacifier 612 can play a role in heat scattering, and the high-temperature heat insulation performance of the vacuum insulation panel is improved through the core material formed by compounding the infrared opacifier 612 and the inorganic fiber cotton 611.
In this embodiment, the inorganic fiber wool 611 is selected from any one of glass fiber wool, ceramic fiber wool and aerogel felt, and the thickness range thereof is 0.1 to 100 mm; at high temperature, the thermal radiation is mainly transmitted in the form of infrared spectrum, and the infrared opacifier 612 increases the scattering effect of infrared in the material by utilizing the high infrared refractive index thereof, continuously reflects or refracts the infrared radiation, increases the heat conduction path, and effectively inhibits the heat transmission effect of the high-temperature radiation. In particular, the infrared opacifier may be selected from the group consisting of TiO2SiC, potassium titanate whisker, carbon black, ceramic fiber BN and other materials, the particle size range of the materials is 10 nm-1000 um, and infrared opacifiers 612 with different particle sizes can effectively inhibit high-temperature radiation heat transfer at different use temperatures. In addition, the mass percentage of the infrared opacifier 612 ranges from 0.5% to 30%, the mass percentage of the binder ranges from 1% to 5%, the rest is the inorganic fiber cotton 611, the mass percentage of the infrared opacifier 612 in the inorganic fiber cotton 611 has an important influence on the inhibition of radiation heat transfer, and the effect is the best at 2.5% by weight.
It is worth mentioning that the diameter of each inorganic fiber filament is 0.5-20um, and the length of each inorganic fiber filament is 5-200 mm.
In some embodiments of the present invention, when the inorganic fiber wool 611 is selected from aerogel blankets, the composite core 61 can be made by the following steps: dispersing the infrared opacifier 612 in a solvent, after the infrared opacifier 612 is uniformly dispersed, impregnating the aerogel felt in a vacuumizing impregnation mode, and finally filling the infrared opacifier 612 in gaps of the aerogel felt, wherein the vacuumizing vacuum degree is less than 0.1 pa.
Considering that the above process has the problems that the infrared opacifier is unevenly attached to the inorganic fiber cotton skeleton, the powder is easy to agglomerate or fall off, and the process is not suitable for mass production, other embodiments of the present invention provide other preparation processes, when the inorganic fiber cotton 611 is selected from glass fiber cotton and ceramic fiber cotton, the composite core material 61 can be manufactured by the following steps: carrying out melting treatment on the preparation raw material of the inorganic fiber cotton; carrying out melt spinning forming treatment on the solution after the melting treatment to form inorganic fiber cotton filaments, wherein in the process of melt spinning forming, an infrared opacifier and a binder are sprayed on the inorganic fiber filaments so that the infrared opacifier is attached to the inorganic fiber filaments; and carrying out cotton collecting, rolling, cotton paving, hot pressing and slitting treatment on the inorganic fiber cotton filaments. By controlling the spinning speed, the binder and the spraying speed of the infrared opacifier 612, the infrared opacifier 612 is uniformly attached to the inorganic cellucotton framework, secondary processing is not needed, and the method is suitable for mass production.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (15)
1. A film material for a vacuum insulation panel, comprising: a heat-seal layer and a gas barrier layer formed on the heat-seal layer; wherein the content of the first and second substances,
the heat sealing layer is made of one or a combination of two of modified polyamide, polyimide, polyphenylene sulfide, polyether ether ketone, polyamide imide, polyphenylene sulfone, polyether sulfone and polysulfone; the material of the gas barrier layer is selected from any one of metal aluminum foil, copper foil and silver foil.
2. The film for a vacuum insulation panel according to claim 1, further comprising a heat-resistant layer formed on the gas barrier layer.
3. The film material for vacuum insulation panels according to claim 2, wherein the material of the thermal barrier layer is selected from one or a combination of two of polyimide, polyetheretherketone, polyphenylene sulfide, polytetrafluoroethylene, liquid crystal polymer, polyamide, polyimide, polyamideimide, polyphenylsulfone, polyethersulfone and polysulfone.
4. The film material for vacuum insulation panels according to claim 2, wherein the heat seal layer, the gas barrier layer and the heat resistance layer have a thickness of 1 to 2000um, and adhesive layers are disposed between the heat seal layer and the gas barrier layer and between the gas barrier layer and the heat resistance layer, and each adhesive layer has a thickness of 1 to 2000 um.
5. The film material for vacuum insulation panels according to claim 2, wherein the heat seal layer is made of one selected from the group consisting of polyetherimide, polyphenylsulfone, polyimide and polyamideimide, and the thickness of the heat seal layer is 20 to 200 μm.
6. The film for vacuum insulation panels according to claim 5, wherein the heat seal layer has a thickness of 30 to 80 um.
7. The film for vacuum insulation panels according to claim 6, wherein the heat seal layer has a thickness of 50 um.
8. A vacuum insulation panel comprising a getter, a composite core material and the film according to any one of claims 1 to 7, wherein the film is in the form of a bag, and the getter and the composite core material are vacuum-sealed in the film.
9. Vacuum insulation panel according to claim 8 wherein said film has a seal flange surrounding said core material, the inner periphery of said seal flange being spaced from the outer periphery of said core material
≥10mm。
10. A method of making a vacuum insulation panel according to claim 8 or 9 comprising the steps of:
making a film material into a film material bag, wherein the heat sealing layer is used as the inner surface of the film material bag;
and filling the composite core material into the film material bag, vacuumizing, and then sealing the composite core material in the film material bag in a vacuum manner through a hot pressing process.
11. The method for preparing a vacuum insulation panel according to claim 10, wherein the heat-sealing layer is made of polyamide, the hot-pressing temperature is 200-250 ℃, the hot-pressing pressure is 0.2-1MPa, and the hot-pressing time is 15-25 s.
12. The method for preparing a vacuum insulation panel according to claim 10, wherein the heat seal layer is made of polyetherimide, the hot pressing temperature is 215-255 ℃, the hot pressing pressure is 0.2-1MPa, and the hot pressing time is 15-25 s.
13. The method for preparing a vacuum insulation panel according to claim 10, wherein the heat sealing layer is made of polyphenylene sulfone, the hot pressing temperature is 220-260 ℃, the hot pressing pressure is 0.2-1MPa, and the hot pressing time is 15-25 s.
14. The method for preparing a vacuum insulation panel according to claim 10, wherein the heat seal layer is made of polyamide-imide, the hot pressing temperature is 255-295 ℃, the hot pressing pressure is 0.2-1MPa, and the hot pressing time is 15-25 s.
15. The method for preparing a vacuum insulation panel according to claim 10, wherein the heat seal layer is made of polyimide, the hot pressing temperature is 300-360 ℃, the hot pressing pressure is 0.2-1MPa, and the hot pressing time is 15-25 s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN114352848A (en) * | 2021-12-10 | 2022-04-15 | 广东美的厨房电器制造有限公司 | Film material for vacuum insulation panel, vacuum insulation panel and preparation method of vacuum insulation panel |
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