Thermal insulation - phase change long-lasting temperature control component for protective packaging and method for its production

Abstract

This invention provides a heat-insulating-phase-change long-lasting temperature-controlling component for protective packaging and its preparation method. The component comprises, arranged sequentially from the inside out, an inner radiating layer, a phase-change temperature-controlling layer, a porous insulation layer, and an outer radiating layer. The outer radiating layer is lining the inner wall of the packaging container, and the layers are bonded together with adhesive. The preparation method includes: coating the outer surfaces of the phase-change temperature-controlling layer and the porous insulation layer with films, then vacuuming to form a temperature-controlling layer component of the target thickness; applying an adhesive to the connecting surfaces of the inner radiating layer, the phase-change temperature-controlling layer, the porous insulation layer, and the outer radiating layer; and then curing to obtain the heat-insulating-phase-change long-lasting temperature-controlling component. This invention can significantly extend the long-lasting temperature control effect under high transport ambient temperatures while ensuring the regularity and smoothness of the packaging container's inner cavity. It also prevents vibration of the transported product and ensures the stability of the transported product.

Description

Technical Field

[0001] This invention belongs to the field of novel heat insulation materials under low radiation, specifically relating to a heat insulation-phase change long-lasting temperature control component for protective packaging and its preparation method. Background Technology

[0002] Under all-weather, multi-regional combat conditions, weapons and equipment are susceptible to extreme high-temperature environments during transportation. Excessively high temperatures accelerate the corrosion of metal parts and the deterioration or aging of other components such as plastics, rubber parts, and packaging paper, leading to unreliable weapon and equipment quality. Therefore, temperature control measures must be implemented during weapon and equipment transportation to maintain a relatively stable temperature within the container. Currently, common temperature control methods mainly involve external or internal cladding with insulating materials such as aerogel and porous polymers. Taking a composite material protective packaging as an example, the insulation performance of using such materials as an internal cladding was tested. The best insulation effect was achieved with an internal cladding of 40mm thick EPP material, which maintained the equipment storage environment at 65℃ for only 4.2 hours. Clearly, this does not meet the long-term temperature control requirements for weapons and equipment during specific transportation processes. Therefore, achieving stable and long-term temperature control under relatively high ambient temperatures (not lower than 60℃) has become a current research focus. Summary of the Invention

[0003] At least in order to solve the technical problems mentioned in the background art, the present invention aims to provide a heat-insulating-phase-change long-lasting temperature-controlling component for protective packaging and its preparation method.

[0004] The present invention adopts the following technical solution.

[0005] A heat-insulating and phase-change long-lasting temperature-controlling component for protective packaging includes an inner radiation layer, a phase-change temperature-controlling layer component, a porous heat-insulating layer component, and an outer radiation layer arranged sequentially from the inside to the outside. The outer radiation layer is lining the inner wall of the packaging container, and the layers are bonded together with adhesive. The phase-change temperature point of the phase-change temperature-controlling layer component is not lower than 60°C.

[0006] As a preferred option, both the inner and outer radiation layers are made of aramid fibers with an aluminum-coated surface or impregnated with a reflective heat-insulating coating.

[0007] As a preferred option, the porous insulation layer component adopts one or at least two of the following: fiberglass needled aerogel felt, glass microspheres, carbon foam, and polyurethane foam.

[0008] As a preferred option, the phase change temperature control layer component adopts one or at least two combinations of the following: a sheet of encapsulated paraffin wax, a capsule of encapsulated paraffin wax, and a porous fiber-loaded phase change material; wherein, the porous fiber-loaded phase change material is a flexible layer in which a phase change material is embedded in an aerogel felt.

[0009] As a preferred option, the phase change temperature control layer component is made of a thin-walled silicone sheet filled with paraffin wax, the cavity diameter or thickness of the paraffin wax chamber is no more than 3 mm, and the thickness of the thin-walled silicone sheet is no more than 6 mm; or, the phase change temperature control layer component is made of a capsule filled with paraffin wax, and the wall material of the capsule is made of silicon dioxide.

[0010] A method for preparing the aforementioned heat-insulating-phase-change long-lasting temperature-controlling component for protective packaging includes the following steps:

[0011] Step 1: Coat the outer surface of the phase change temperature control layer with a film, and then evacuate the phase change temperature control layer to form a phase change temperature control layer component of the target thickness.

[0012] Step 2: Apply a film to the outer surface of the porous insulation layer, and then vacuum the porous insulation layer to form a porous insulation layer component of the target thickness.

[0013] Step 3: Apply adhesive to the joint surfaces of the inner radiation layer, phase change temperature control layer, porous heat insulation layer, and outer radiation layer, and then cure and shape to obtain a heat insulation-phase change long-term temperature control component.

[0014] Furthermore, the specific steps of coating the outer surface of the phase change temperature control layer and then evacuating the phase change temperature control layer include:

[0015] Step 11: First, cover the outer surface of the phase change temperature control layer with an inner film, and then cover the inner film with an outer film.

[0016] Step 12: Place the coated phase change temperature control layer into the mold cavity, and then close the mold;

[0017] Step 13: Perform a first vacuuming of the space between the inner and outer membranes to transform the phase change temperature control layer into a curved structure.

[0018] Step 14: First, perform a second vacuuming on the space inside the inner film and the phase change temperature control layer to form a structure that adapts the phase change temperature control layer to the inner wall of the packaging container; then peel off the outer film and demold to obtain the phase change temperature control layer component.

[0019] Furthermore, the specific steps of coating the porous insulation layer with a film and then evacuating the porous insulation layer include:

[0020] Step 21: First, cover the outer surface of the porous insulation layer with an inner film, and then cover the inner film with an outer film.

[0021] Step 22: Place the coated porous insulation layer into the mold cavity, and then close the mold;

[0022] Step 23: Perform a first vacuuming of the space between the inner and outer membranes to transform the porous insulation layer into a curved structure.

[0023] Step 24: First, a second vacuum is applied to the space inside the inner film and the porous insulation layer to form a structure that fits the inner wall of the packaging container; then the outer film is peeled off, and the porous insulation layer component is obtained after demolding.

[0024] As a preferred embodiment of the present invention

[0025] (a) Using 9mm thick fiberglass needled aerogel felt as a porous insulation layer, 2.5kg / m 2 A porous fiber-supported paraffin (65℃) serves as the phase change temperature control layer, with an aluminum-coated film as the radiation layer; 2.5 kg / m 2 Porous fiber-supported paraffin was prepared by a porous matrix adsorption method: paraffin was melted at 80℃, and 3mm aerogel felt was added to the molten paraffin. 2 Aerogel was mixed with 2.5 kg of molten paraffin, vacuumed, and treated under vacuum conditions for 1 hour to obtain a phase change temperature control layer.

[0026] or,

[0027] (b) Using 9mm thick fiberglass needled aerogel felt as a porous insulation layer, 3kg / m 2 Porous fibers loaded with paraffin (65℃) serve as the phase change temperature control layer, with an aluminum-coated film as the radiation layer; 3kg / m 2 Porous fiber-supported paraffin was prepared by a porous matrix adsorption method: paraffin was melted at 80℃, and 3mm aerogel felt was added to the molten paraffin. 2 Aerogel was mixed with 3 kg of molten paraffin, vacuumed, and treated under vacuum conditions for 1 hour to obtain a phase change temperature control layer.

[0028] or,

[0029] (c) Using 9mm thick fiberglass needled aerogel felt as a porous insulation layer, 2.5kg / m 2 A porous fiber-supported paraffin (62℃) serves as the phase change temperature control layer, with an aluminum-coated film as the radiation layer; 2.5 kg / m 2 Porous fiber-supported paraffin was prepared by a porous matrix adsorption method: paraffin was melted at 80℃, and 3mm aerogel felt was added to the molten paraffin. 2 Aerogel was mixed with 2.5 kg of molten paraffin, vacuumed, and treated under vacuum conditions for 1 hour to obtain a phase change temperature control layer.

[0030] or,

[0031] (d) Using 9mm thick fiberglass needled aerogel felt as a porous insulation layer, 2.5kg / m 2 The phase change microcapsules (65℃) serve as the phase change temperature control layer, with an aluminum-coated film as the radiation layer.

[0032] As a preferred embodiment of the present invention

[0033] (e) Using 9mm thick fiberglass needled aerogel felt as a porous insulation layer, 2.5kg / m 2 A porous silicone sheet loaded with paraffin (65℃) serves as the phase change temperature control layer, with an aluminum-coated film as the radiation layer; 2.5 kg / m 2 The porous silicone sheet was prepared using an injection method: paraffin wax was melted at 80°C, and the molten paraffin wax was injected into the micropores of the porous silicone sheet, with a density of 1m per micrometer. 2 A porous silicone sheet mixed with 2.5 kg of molten paraffin is cured to obtain a phase change temperature control layer.

[0034] or,

[0035] (f) A porous insulation layer of 9mm thick fiberglass needled aerogel felt, 2.5kg / m 2 A porous silicone sheet loaded with paraffin (65℃) serves as the phase change temperature control layer, with an aluminum-coated film as the radiation layer; 2.5 kg / m 2 The porous silicone sheet was prepared by an injection method: paraffin wax was melted at 80°C, and the molten paraffin wax was injected into the channels of two porous silicone sheets that could be closed together, with a spacing of 1m. 2 Two porous silicone sheets are mixed with 2.5 kg of molten paraffin. The two porous silicone sheets are then joined together and bonded. After curing, a phase change temperature control layer is obtained.

[0036] Among them, the wall thickness between adjacent holes in the porous silicone sheet is no more than 2mm, and the wall thickness between adjacent channels in the porous silicone sheet is no more than 1mm.

[0037] Beneficial effects: This invention can significantly extend the long-term temperature control effect under high transport ambient temperature conditions while ensuring the regularity and smoothness of the inner cavity of the packaging container. In particular, it can extend the long-term temperature control effect to nearly 24 hours or more under ambient temperature of room temperature to 65°C, and to nearly 50 hours under ambient temperature of 65°C to 70°C. Compared with the long-term temperature control performance of existing conventional materials, this invention improves the long-term temperature control performance by nearly ten times. The temperature control component provided by this invention will not cause any scratch damage to the product inside the packaging container. It is especially suitable for transporting core components of precision equipment, and at the same time, it has the function of preventing the transported product from vibrating and ensuring the stability of the transported product. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the component forming process in the embodiment;

[0039] Figure 2 This is a schematic diagram of the cross-section of the phase change temperature control layer in Example 5;

[0040] Figure 3 This is a schematic diagram of the cross-section of the phase change temperature control layer in Example 6. Detailed Implementation

[0041] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example 1

[0042] A heat-insulating and phase-change long-lasting temperature-controlling component for protective packaging includes, in sequence from the inside out, an inner radiating layer, a phase-change temperature-controlling layer, a porous heat-insulating layer, and an outer radiating layer. The outer radiating layer is lining the inner wall of the packaging container, and the layers are bonded together with adhesive. The phase-change temperature of the phase-change temperature-controlling layer is not lower than 60°C. The preparation process of the temperature-controlling component in this embodiment is as follows:

[0043] First, a porous insulation layer, a radiation layer, and a phase change temperature control layer were selected: a 9mm thick glass fiber needled aerogel felt was used as the porous insulation layer, with a density of 2.5kg / m². 2 A porous fiber-supported paraffin (i.e., phase change temperature 65℃) serves as the phase change temperature control layer, with a 0.12mm thick aluminized film as the radiation layer; among which, 2.5kg / m 2 Porous fiber-supported paraffin was prepared by a porous matrix adsorption method: paraffin was melted at 80℃, and 3mm aerogel felt was added to the molten paraffin. 2 Aerogel was mixed with 2.5 kg of molten paraffin, vacuumed, and treated under vacuum conditions for 1 hour to obtain a phase change temperature control layer.

[0044] Step 1: Coat the outer surface of the phase change temperature control layer with a film, then evacuate the phase change temperature control layer to form a phase change temperature control layer component of the target thickness; specifically, combined with... Figure 1 As shown:

[0045] Step 11: First, cover the outer surface of the phase change temperature control layer with an inner film, and then cover the inner film with an outer film.

[0046] Step 12: Place the coated phase change temperature control layer into the mold cavity, and then close the mold. The mold includes a concave mold 21 and a convex mold 22. The internal structure of the mold is the same as the internal structure of the packaging container. In each embodiment, the inner film is described below. Figure 1 As shown in number 11, the outer membrane is seen Figure 1 As shown in number 12, the phase change temperature control layer is seen Figure 1 As shown in number 13;

[0047] Step 13: Perform a first vacuuming of the space between the inner and outer membranes to transform the phase change temperature control layer into a curved structure.

[0048] Step 14: First, perform a second vacuuming on the space inside the inner film and the phase change temperature control layer to make the phase change temperature control layer form a structure that fits the inner wall of the packaging container; then peel off the outer film and demold to obtain the phase change temperature control layer component.

[0049] Step 2: Apply a film to the outer surface of the porous insulation layer, then vacuum the porous insulation layer to form a porous insulation layer component of the target thickness; specifically:

[0050] Step 21: First, cover the outer surface of the porous insulation layer with an inner film, and then cover the inner film with an outer film.

[0051] Step 22: Place the coated porous insulation layer into the mold cavity, and then close the mold;

[0052] Step 23: Perform a first vacuuming of the space between the inner and outer membranes to transform the porous insulation layer into a curved structure.

[0053] Step 24: First, a second vacuum is applied to the space inside the inner film and the porous insulation layer to form a structure that fits the inner wall of the packaging container; then the outer film is peeled off, and the porous insulation layer component is obtained after demolding.

[0054] Step 3: Apply adhesive to the joint surfaces of the inner radiation layer, phase change temperature control layer, porous heat insulation layer, and outer radiation layer, and then cure and shape to obtain a heat insulation-phase change long-term temperature control component. Example 2

[0055] A heat-insulating and phase-change long-lasting temperature-controlling component for protective packaging includes, in sequence from the inside out, an inner radiating layer, a phase-change temperature-controlling layer, a porous heat-insulating layer, and an outer radiating layer. The outer radiating layer is lining the inner wall of the packaging container, and the layers are bonded together with adhesive. The radiating layer is an aluminized film with a thickness of 0.12 mm, and the phase-change temperature-controlling layer has a phase-change temperature point of not less than 60°C. The fabrication process of the temperature-controlling component in this embodiment is as follows:

[0056] First, a porous insulation layer, a radiation layer, and a phase change temperature control layer are selected: a 9mm thick glass fiber needled aerogel felt is used as the porous insulation layer, with a density of 3kg / m². 2 Porous fibers loaded with paraffin (i.e., phase change temperature 65℃) serve as the phase change temperature control layer, with an aluminum-coated film as the radiation layer; 3kg / m 2 Porous fiber-supported paraffin was prepared by a porous matrix adsorption method: paraffin was melted at 80℃, and 3mm aerogel felt was added to the molten paraffin. 2 Aerogel was mixed with 3 kg of molten paraffin, vacuumed, and treated under vacuum conditions for 1 hour to obtain a phase change temperature control layer.

[0057] Step 1: Coat the outer surface of the phase change temperature control layer with a film, then evacuate the phase change temperature control layer to form a phase change temperature control layer component of the target thickness; specifically:

[0058] Step 11: First, cover the outer surface of the phase change temperature control layer with an inner film, and then cover the inner film with an outer film.

[0059] Step 12: Place the coated phase change temperature control layer into the mold cavity, and then close the mold. The mold includes a concave mold 1 and a convex mold 2. The internal structure of the mold cavity is the same as that of the packaging container cavity.

[0060] Step 13: Perform a first vacuuming of the space between the inner and outer membranes to transform the phase change temperature control layer into a curved structure.

[0061] Step 14: First, perform a second vacuuming on the space inside the inner film and the phase change temperature control layer to make the phase change temperature control layer form a structure that fits the inner wall of the packaging container; then peel off the outer film and demold to obtain the phase change temperature control layer component.

[0062] Step 2: Apply a film to the outer surface of the porous insulation layer, then vacuum the porous insulation layer to form a porous insulation layer component of the target thickness; specifically:

[0063] Step 21: First, cover the outer surface of the porous insulation layer with an inner film, and then cover the inner film with an outer film.

[0064] Step 22: Place the coated porous insulation layer into the mold cavity, and then close the mold;

[0065] Step 23: Perform a first vacuuming of the space between the inner and outer membranes to transform the porous insulation layer into a curved structure.

[0066] Step 24: First, a second vacuum is applied to the space inside the inner film and the porous insulation layer to form a structure that fits the inner wall of the packaging container; then the outer film is peeled off, and the porous insulation layer component is obtained after demolding.

[0067] Step 3: Apply adhesive to the joint surfaces of the inner radiation layer, phase change temperature control layer, porous heat insulation layer, and outer radiation layer, and then cure and shape to obtain a heat insulation-phase change long-term temperature control component. Example 3

[0068] A heat-insulating and phase-change long-lasting temperature-controlling component for protective packaging includes, in sequence from the inside out, an inner radiating layer, a phase-change temperature-controlling layer, a porous heat-insulating layer, and an outer radiating layer. The outer radiating layer is lining the inner wall of the packaging container, and the layers are bonded together with adhesive. The radiating layer is an aluminized film with a thickness of 0.12 mm, and the phase-change temperature-controlling layer has a phase-change temperature point of not less than 60°C. The fabrication process of the temperature-controlling component in this embodiment is as follows:

[0069] First, a porous insulation layer, a radiation layer, and a phase change temperature control layer were selected: a 9mm thick glass fiber needled aerogel felt was used as the porous insulation layer, with a density of 2.5kg / m².2 A porous fiber-supported paraffin (62℃) serves as the phase change temperature control layer, with an aluminum-coated film as the radiation layer; 2.5 kg / m 2 Porous fiber-supported paraffin was prepared by a porous matrix adsorption method: paraffin was melted at 80℃, and 3mm aerogel felt was added to the molten paraffin. 2 Aerogel was mixed with 2.5 kg of molten paraffin, vacuumed, and treated under vacuum conditions for 1 hour to obtain a phase change temperature control layer.

[0070] Step 1: Coat the outer surface of the phase change temperature control layer with a film, then evacuate the phase change temperature control layer to form a phase change temperature control layer component of the target thickness; specifically:

[0071] Step 11: First, cover the outer surface of the phase change temperature control layer with an inner film, and then cover the inner film with an outer film.

[0072] Step 12: Place the coated phase change temperature control layer into the mold cavity, and then close the mold. The mold includes a concave mold 1 and a convex mold 2. The internal structure of the mold cavity is the same as that of the packaging container cavity.

[0073] Step 13: Perform a first vacuuming of the space between the inner and outer membranes to transform the phase change temperature control layer into a curved structure.

[0074] Step 14: First, perform a second vacuuming on the space inside the inner film and the phase change temperature control layer to make the phase change temperature control layer form a structure that fits the inner wall of the packaging container; then peel off the outer film and demold to obtain the phase change temperature control layer component.

[0075] Step 2: Apply a film to the outer surface of the porous insulation layer, then vacuum the porous insulation layer to form a porous insulation layer component of the target thickness; specifically:

[0076] Step 21: First, cover the outer surface of the porous insulation layer with an inner film, and then cover the inner film with an outer film.

[0077] Step 22: Place the coated porous insulation layer into the mold cavity, and then close the mold;

[0078] Step 23: Perform a first vacuuming of the space between the inner and outer membranes to transform the porous insulation layer into a curved structure.

[0079] Step 24: First, a second vacuum is applied to the space inside the inner film and the porous insulation layer to form a structure that fits the inner wall of the packaging container; then the outer film is peeled off, and the porous insulation layer component is obtained after demolding.

[0080] Step 3: Apply adhesive to the joint surfaces of the inner radiation layer, phase change temperature control layer, porous heat insulation layer, and outer radiation layer, and then cure and shape to obtain a heat insulation-phase change long-term temperature control component. Example 4

[0081] A heat-insulating and phase-change long-lasting temperature-controlling component for protective packaging includes, in sequence from the inside out, an inner radiating layer, a phase-change temperature-controlling layer, a porous heat-insulating layer, and an outer radiating layer. The outer radiating layer is lining the inner wall of the packaging container, and the layers are bonded together with adhesive. The radiating layer is an aluminized film with a thickness of 0.12 mm, and the phase-change temperature-controlling layer has a phase-change temperature point of not less than 60°C. The fabrication process of the temperature-controlling component in this embodiment is as follows:

[0082] First, a porous insulation layer, a radiation layer, and a phase change temperature control layer were selected: a 9mm thick glass fiber needled aerogel felt was used as the porous insulation layer, with a density of 2.5kg / m². 2 The phase change microcapsules (65℃) serve as the phase change temperature control layer, with an aluminum-plated film as the radiation layer.

[0083] Step 1: Coat the outer surface of the phase change temperature control layer with a film, then evacuate the phase change temperature control layer to form a phase change temperature control layer component of the target thickness; specifically:

[0084] Step 11: First, cover the outer surface of the phase change temperature control layer with an inner film, and then cover the inner film with an outer film.

[0085] Step 12: Place the coated phase change temperature control layer into the mold cavity, and then close the mold. The mold includes a concave mold 1 and a convex mold 2. The internal structure of the mold cavity is the same as that of the packaging container cavity.

[0086] Step 13: Perform a first vacuuming of the space between the inner and outer membranes to transform the phase change temperature control layer into a curved structure.

[0087] Step 14: First, perform a second vacuuming on the space inside the inner film and the phase change temperature control layer to make the phase change temperature control layer form a structure that fits the inner wall of the packaging container; then peel off the outer film and demold to obtain the phase change temperature control layer component.

[0088] Step 2: Apply a film to the outer surface of the porous insulation layer, then vacuum the porous insulation layer to form a porous insulation layer component of the target thickness; specifically:

[0089] Step 21: First, cover the outer surface of the porous insulation layer with an inner film, and then cover the inner film with an outer film.

[0090] Step 22: Place the coated porous insulation layer into the mold cavity, and then close the mold;

[0091] Step 23: Perform a first vacuuming of the space between the inner and outer membranes to transform the porous insulation layer into a curved structure.

[0092] Step 24: First, a second vacuum is applied to the space inside the inner film and the porous insulation layer to form a structure that fits the inner wall of the packaging container; then the outer film is peeled off, and the porous insulation layer component is obtained after demolding.

[0093] Step 3: Apply adhesive to the joint surfaces of the inner radiation layer, phase change temperature control layer, porous heat insulation layer, and outer radiation layer, and then cure and shape to obtain a heat insulation-phase change long-term temperature control component. Example 5

[0094] A heat-insulating and phase-change long-lasting temperature-controlling component for protective packaging includes, in sequence from the inside out, an inner radiating layer, a phase-change temperature-controlling layer, a porous heat-insulating layer, and an outer radiating layer. The outer radiating layer is lining the inner wall of the packaging container, and the layers are bonded together with adhesive. The radiating layer is an aluminized film with a thickness of 0.12 mm, and the phase-change temperature-controlling layer has a phase-change temperature point of not less than 60°C. The fabrication process of the temperature-controlling component in this embodiment is as follows:

[0095] First, a porous insulation layer, a radiation layer, and a phase change temperature control layer were selected: a 9mm thick glass fiber needled aerogel felt was used as the porous insulation layer, with a density of 2.5kg / m². 2 A porous silicone sheet loaded with paraffin (65℃) serves as the phase change temperature control layer, with an aluminum-coated film as the radiation layer; 2.5 kg / m 2 The porous silicone sheet was prepared using an injection method: paraffin wax was melted at 80°C, and the molten paraffin wax was injected into the micropores of the porous silicone sheet, with a density of 1m per micrometer. 2 A porous silicone sheet mixed with 2.5 kg of molten paraffin is cured to obtain a phase change temperature control layer; the cross-sectional structure of the porous silicone sheet is as follows: Figure 2 As shown, it includes a silicone substrate 1 and holes 2 disposed on the silicone substrate 1, wherein the wall thickness between adjacent holes in the porous silicone sheet is no greater than 2 mm;

[0096] Step 1: Coat the outer surface of the phase change temperature control layer with a film, then evacuate the phase change temperature control layer to form a phase change temperature control layer component of the target thickness; specifically:

[0097] Step 11: First, cover the outer surface of the phase change temperature control layer with an inner film, and then cover the inner film with an outer film.

[0098] Step 12: Place the coated phase change temperature control layer into the mold cavity, and then close the mold. The mold includes a concave mold 1 and a convex mold 2. The internal structure of the mold cavity is the same as that of the packaging container cavity.

[0099] Step 13: Perform a first vacuuming of the space between the inner and outer membranes to transform the phase change temperature control layer into a curved structure.

[0100] Step 14: First, perform a second vacuuming on the space inside the inner film and the phase change temperature control layer to make the phase change temperature control layer form a structure that fits the inner wall of the packaging container; then peel off the outer film and demold to obtain the phase change temperature control layer component.

[0101] Step 2: Apply a film to the outer surface of the porous insulation layer, then vacuum the porous insulation layer to form a porous insulation layer component of the target thickness; specifically:

[0102] Step 21: First, cover the outer surface of the porous insulation layer with an inner film, and then cover the inner film with an outer film.

[0103] Step 22: Place the coated porous insulation layer into the mold cavity, and then close the mold;

[0104] Step 23: Perform a first vacuuming of the space between the inner and outer membranes to transform the porous insulation layer into a curved structure.

[0105] Step 24: First, a second vacuum is applied to the space inside the inner film and the porous insulation layer to form a structure that fits the inner wall of the packaging container; then the outer film is peeled off, and the porous insulation layer component is obtained after demolding.

[0106] Step 3: Apply adhesive to the joint surfaces of the inner radiation layer, phase change temperature control layer, porous heat insulation layer, and outer radiation layer, and then cure and shape to obtain a heat insulation-phase change long-term temperature control component. Example 6

[0107] A heat-insulating and phase-change long-lasting temperature-controlling component for protective packaging includes, in sequence from the inside out, an inner radiating layer, a phase-change temperature-controlling layer, a porous heat-insulating layer, and an outer radiating layer. The outer radiating layer is lining the inner wall of the packaging container, and the layers are bonded together with adhesive. The radiating layer is an aluminized film with a thickness of 0.12 mm, and the phase-change temperature-controlling layer has a phase-change temperature point of not less than 60°C. The fabrication process of the temperature-controlling component in this embodiment is as follows:

[0108] First, a porous insulation layer, a radiation layer, and a phase change temperature control layer were selected: a 9mm thick glass fiber needled aerogel felt was used as the porous insulation layer, with a density of 2.5kg / m². 2 A porous silicone sheet loaded with paraffin (65℃) serves as the phase change temperature control layer, with an aluminum-coated film as the radiation layer; 2.5 kg / m 2 The porous silicone sheet was prepared by an injection method: paraffin wax was melted at 80°C, and the molten paraffin wax was injected into the channels of two porous silicone sheets that could be closed together, with a spacing of 1m. 2 Two porous silicone sheets are mixed with 2.5 kg of molten paraffin wax, then joined and bonded together. After curing, a phase change temperature control layer is obtained. The cross-sectional structure of the porous silicone sheet is as follows: Figure 3As shown, it includes a silicone substrate 1 and holes 2 on the silicone substrate 1 (in essence, semi-circular channels are provided on the joint surfaces of two silicone substrates 1, and then the two silicone substrates 1 are fastened together to form a circular channel). The wall thickness between adjacent channels in the multi-channel silicone sheet is no more than 1 mm.

[0109] Step 1: Coat the outer surface of the phase change temperature control layer with a film, then evacuate the phase change temperature control layer to form a phase change temperature control layer component of the target thickness; specifically:

[0110] Step 11: First, cover the outer surface of the phase change temperature control layer with an inner film, and then cover the inner film with an outer film.

[0111] Step 12: Place the coated phase change temperature control layer into the mold cavity, and then close the mold. The mold includes a concave mold 1 and a convex mold 2. The internal structure of the mold cavity is the same as that of the packaging container cavity.

[0112] Step 13: Perform a first vacuuming of the space between the inner and outer membranes to transform the phase change temperature control layer into a curved structure.

[0113] Step 14: First, perform a second vacuuming on the space inside the inner film and the phase change temperature control layer to make the phase change temperature control layer form a structure that fits the inner wall of the packaging container; then peel off the outer film and demold to obtain the phase change temperature control layer component.

[0114] Step 2: Apply a film to the outer surface of the porous insulation layer, then vacuum the porous insulation layer to form a porous insulation layer component of the target thickness; specifically:

[0115] Step 21: First, cover the outer surface of the porous insulation layer with an inner film, and then cover the inner film with an outer film.

[0116] Step 22: Place the coated porous insulation layer into the mold cavity, and then close the mold;

[0117] Step 23: Perform a first vacuuming of the space between the inner and outer membranes to transform the porous insulation layer into a curved structure.

[0118] Step 24: First, a second vacuum is applied to the space inside the inner film and the porous insulation layer to form a structure that fits the inner wall of the packaging container; then the outer film is peeled off, and the porous insulation layer component is obtained after demolding.

[0119] Step 3: Apply adhesive to the joint surfaces of the inner radiation layer, phase change temperature control layer, porous heat insulation layer, and outer radiation layer, and then cure and shape to obtain a heat insulation-phase change long-term temperature control component.

[0120] The performance of the thermal insulation-phase change long-term temperature control components prepared in each embodiment was tested, and the results are shown in Table 1.

[0121] Table 1 Performance test results of thermal insulation-phase change long-term temperature control components

[0122]

[0123] As can be seen from the embodiments, the heat insulation-phase change long-term temperature control component of the present invention can effectively control the temperature of the equipment storage environment at 65°C for 24.5 hours, and its thickness is about 13 mm; it can also effectively control the temperature of the equipment storage environment at 65°C to 70°C for 49.55 hours. The comparative solutions are shown in Table 2 below.

[0124] Table 2 Temperature control performance of conventional thermal insulation / phase change long-lasting temperature control materials

[0125]

[0126] This invention can significantly extend the long-term temperature control effect under high transport ambient temperature conditions while ensuring the regularity and smoothness of the inner cavity of the packaging container. In particular, it can extend the long-term temperature control effect to nearly 24 hours or more under ambient temperature of room temperature to 65°C, and to nearly 50 hours under ambient temperature of 65°C to 70°C. Compared with the long-term temperature control performance of existing conventional materials, this invention improves the long-term temperature control performance by nearly ten times. The temperature control component provided by this invention will not cause any scratch damage to the product inside the packaging container. It is especially suitable for transporting core components of precision equipment, and at the same time, it has the function of preventing vibration of the transported product and ensuring the stability of the transported product.

Claims

1. A method for preparing a heat-insulating-phase-change long-lasting temperature-controlling component for protective packaging, characterized in that, The heat-insulating-phase-change long-lasting temperature control component for protective packaging includes an inner radiation layer, a phase-change temperature control layer component, a porous heat insulation layer component, and an outer radiation layer arranged sequentially from the inside to the outside. The outer radiation layer is lining the inner wall of the packaging container, and the layers are bonded together with adhesive. The phase change temperature point of the phase change temperature control layer component is not lower than 60℃. The preparation method includes the following steps: Step 1: Coat the outer surface of the phase change temperature control layer with a film, and then evacuate the phase change temperature control layer to form a phase change temperature control layer component of the target thickness. Step 2: Apply a film to the outer surface of the porous insulation layer, and then vacuum the porous insulation layer to form a porous insulation layer component of the target thickness. Step 3: Apply adhesive to the joint surfaces of the inner radiation layer, phase change temperature control layer, porous heat insulation layer, and outer radiation layer, and then cure and shape to obtain a heat insulation-phase change long-term temperature control component.

2. The preparation method according to claim 1, characterized in that: Both the inner and outer radiation layers are made of aramid fibers with an aluminum-coated surface or impregnated with reflective heat-insulating coating.

3. The preparation method according to claim 1, characterized in that: The porous insulation layer component adopts one or at least two of the following: fiberglass needled aerogel felt, glass microspheres, carbon foam, and polyurethane foam.

4. The preparation method according to claim 1, characterized in that: The phase change temperature control layer component adopts one or more of the following: a sheet of encapsulated paraffin wax, a capsule of encapsulated paraffin wax, and a porous fiber-loaded phase change material; wherein, the porous fiber-loaded phase change material is a flexible layer in which the phase change material is embedded in an aerogel felt.

5. The preparation method according to claim 1, characterized in that: The phase change temperature control layer component is made of a thin-walled silicone sheet filled with paraffin wax, the cavity diameter or thickness of which contains the paraffin wax is no greater than 3 mm, and the thickness of the thin-walled silicone sheet is no greater than 6 mm; or, the phase change temperature control layer component is made of a capsule filled with paraffin wax, the wall material of which is made of silicon dioxide.

6. The preparation method according to claim 1, characterized in that, The specific steps for coating the outer surface of the phase change temperature control layer and then evacuating the phase change temperature control layer include: Step 11: First, cover the outer surface of the phase change temperature control layer with an inner film, and then cover the inner film with an outer film. Step 12: Place the coated phase change temperature control layer into the mold cavity, and then close the mold; Step 13: Perform a first vacuuming of the space between the inner and outer membranes to transform the phase change temperature control layer into a curved structure. Step 14: First, perform a second vacuuming on the space inside the inner film and the phase change temperature control layer to form a structure that adapts the phase change temperature control layer to the inner wall of the packaging container; then peel off the outer film and demold to obtain the phase change temperature control layer component.

7. The preparation method according to claim 1, characterized in that, The specific steps for coating the porous insulation layer with a film and then evacuating the porous insulation layer include: Step 21: First, cover the outer surface of the porous insulation layer with an inner film, and then cover the inner film with an outer film. Step 22: Place the coated porous insulation layer into the mold cavity, and then close the mold; Step 23: Perform a first vacuuming of the space between the inner and outer membranes to transform the porous insulation layer into a curved structure. Step 24: First, a second vacuum is applied to the space inside the inner film and the porous insulation layer to form a structure that fits the inner wall of the packaging container; then the outer film is peeled off, and the porous insulation layer component is obtained after demolding.

8. The preparation method according to claim 6 or 7, characterized in that: (a) Using 9mm thick fiberglass needled aerogel felt as a porous insulation layer, 2.5kg / m 2 A porous fiber-supported paraffin layer with a phase change temperature of 65℃ serves as the phase change temperature control layer, with an aluminum-coated film as the radiation layer; 2.5 kg / m 2 Porous fiber-supported paraffin was prepared by a porous matrix adsorption method: paraffin was melted at 80℃, and 3mm aerogel felt was added to the molten paraffin. 2 Aerogel was mixed with 2.5 kg of molten paraffin, vacuumed, and treated under vacuum conditions for 1 hour to obtain a phase change temperature control layer. or, (b) Using 9mm thick fiberglass needled aerogel felt as a porous insulation layer, 3kg / m 2 A porous fiber-supported paraffin with a phase change temperature of 65℃ serves as the phase change temperature control layer, with an aluminum-coated film as the radiation layer; 3kg / m 2 Porous fiber-supported paraffin was prepared by a porous matrix adsorption method: paraffin was melted at 80℃, and 3mm aerogel felt was added to the molten paraffin. 2 Aerogel was mixed with 3 kg of molten paraffin, vacuumed, and treated under vacuum conditions for 1 hour to obtain a phase change temperature control layer. or, (c) Using 9mm thick fiberglass needled aerogel felt as a porous insulation layer, 2.5kg / m 2 A porous fiber-supported paraffin layer with a phase change temperature of 62℃ serves as the phase change temperature control layer, with an aluminum-coated film as the radiation layer; 2.5 kg / m 2 Porous fiber-supported paraffin was prepared by a porous matrix adsorption method: paraffin was melted at 80℃, and 3mm aerogel felt was added to the molten paraffin. 2 Aerogel was mixed with 2.5 kg of molten paraffin, vacuumed, and treated under vacuum conditions for 1 hour to obtain a phase change temperature control layer. or, (d) Using 9mm thick fiberglass needled aerogel felt as a porous insulation layer, 2.5kg / m 2 The phase change microcapsules with a phase change temperature of 65℃ serve as the phase change temperature control layer, and the aluminum-plated film serves as the radiation layer.

9. The preparation method according to claim 6 or 7, characterized in that: (e) Using 9mm thick fiberglass needled aerogel felt as a porous insulation layer, 2.5kg / m 2 A porous silicone sheet with a phase change temperature of 65℃, loaded with paraffin, serves as the phase change temperature control layer, and an aluminum-coated film acts as the radiation layer; 2.5 kg / m 2 The porous silicone sheet was prepared using an injection method: paraffin wax was melted at 80°C, and the molten paraffin wax was injected into the micropores of the porous silicone sheet, with a density of 1m per micrometer. 2 A porous silicone sheet mixed with 3kg of molten paraffin is cured to obtain a phase change temperature control layer. or, (f) A porous insulation layer of 9mm thick fiberglass needled aerogel felt, 2.5kg / m 2 A porous silicone sheet loaded with paraffin, with a phase change temperature of 65℃, serves as the phase change temperature control layer, while an aluminum-coated film acts as the radiation layer; 2.5 kg / m 2 The porous silicone sheet was prepared by an injection method: paraffin wax was melted at 80°C, and the molten paraffin wax was injected into the channels of two porous silicone sheets that could be closed together, with a spacing of 1m. 2 A porous silicone sheet is mixed with 3 kg of molten paraffin. Then, the two porous silicone sheets are joined together and bonded. After curing, a phase change temperature control layer is obtained. Among them, the wall thickness between adjacent holes in the porous silicone sheet is no more than 2mm, and the wall thickness between adjacent channels in the porous silicone sheet is no more than 1mm.

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