Heat-insulating and cooling sheet made of heat-insulating and cooling powder

Abstract

The invention discloses a heat-insulating and cooling sheet made of heat-insulating and cooling powder, and relates to the technical field of heat-insulating materials, and the heat-insulating and cooling sheet comprises the following components: 30-40% of a solid electrolyte matrix; 25%-45% of a nanometer heat insulation filler; 5%-10% of an ionic conduction enhancer; 10%-35% of a binder; according to the invention, through the heat insulation cooling sheet based on ion conduction, the heat insulation effect can be automatically adjusted along with the change of the environment temperature, when the external temperature rises, the ion migration rate in the solid electrolyte is accelerated, part of heat energy is converted into electric potential energy, heat conduction is hindered, and when the temperature is reduced, the ion migration is slowed down; and meanwhile, the solid electrolyte and the nanometer heat insulation filler have a synergistic effect, so that the heat conductivity coefficient of the material is greatly reduced, and the heat insulation effect is further improved through energy conversion in the ion conduction process.

Description

Technical Field

[0001] The invention relates to the technical field of heat insulation materials, in particular to a heat insulation and cooling sheet made of heat insulation and cooling powder. Background Art

[0002] With the rapid development of fields such as construction, electronics, aerospace, etc., the performance requirements for thermal insulation materials are increasing. Thermal insulation materials play a key role in maintaining the normal operating temperature of equipment, ensuring a comfortable environment for personnel, and reducing energy consumption. At present, the market has an urgent need for new thermal insulation materials that can adapt to different ambient temperatures and have intelligently adjustable thermal insulation effects. Traditional thermal insulation material technology can no longer meet these ever-increasing needs. Therefore, the research and development of a material with an innovative thermal insulation mechanism has become the focus of industry attention, in order to promote the development of thermal insulation technology towards higher performance and more intelligent directions.

[0003] Traditional thermal insulation materials mainly rely on physical barriers to achieve thermal insulation, and have many obvious shortcomings. On the one hand, the thermal insulation performance of traditional thermal insulation materials is difficult to dynamically adjust with the ambient temperature. For example, organic thermal insulation materials such as polystyrene foam boards, although low in cost, have relatively high thermal conductivity and are prone to deformation and aging in high temperature environments, resulting in a significant decrease in thermal insulation performance and an inability to effectively adapt to the challenges brought by temperature changes. Although new thermal insulation materials such as aerogels have low thermal conductivity, their preparation process is complex and costly, and they also lack temperature-adaptive thermal insulation capabilities and cannot automatically adjust the thermal insulation effect according to changes in external temperature. On the other hand, traditional thermal insulation materials perform poorly in energy utilization efficiency and are unable to effectively convert and utilize the energy contained in changes in external ambient temperature, resulting in energy waste. These shortcomings make traditional thermal insulation materials appear powerless when facing the urgent demand for high-performance thermal insulation materials from modern industrial and technological development, and are unable to meet the requirements of many fields for intelligent and efficient thermal insulation materials. Summary of the Invention

[0004] The purpose of the present invention is to make up for the shortcomings of the existing technology and provide a thermal insulation and cooling sheet made of thermal insulation and cooling powder. It can achieve a significant improvement in the intelligence level of thermal insulation materials by using a perovskite solid electrolyte with good ion conductivity as the basis, and combining it with nano thermal insulation fillers, ion conductivity enhancers, binders and functional additives. When the external temperature changes, the ion migration rate in the solid electrolyte changes accordingly, thereby dynamically adjusting the heat transfer and enabling the material to have intelligent thermal insulation adjustment capabilities. The thermal insulation and cooling sheet not only has high-efficiency thermal insulation performance and greatly reduces the thermal conductivity of the material, but also has many advantages such as energy saving and environmental protection, good comprehensive performance and high process feasibility. It can meet the needs of many fields such as construction, electronics, aerospace, etc. for high-performance thermal insulation materials, and shows broad application prospects.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: a heat-insulating and cooling sheet made of heat-insulating and cooling powder, wherein the weight proportions of the components of the heat-insulating and cooling sheet are as follows: Solid electrolyte matrix 30%-40%; Nano thermal insulation filler 25%-45%; Ion conduction enhancer 5%-10%; Binder 10%-35%; Functional additives 1.5%-4%.

[0006] Furthermore, the solid electrolyte matrix is a perovskite solid electrolyte, preferably La0.9Sr0.1Ga0.8Mg0.2O3-δ, whose crystal structure is ABO3 type, and the specific arrangement of A-site and B-site ions forms a channel that is conducive to ion conduction.

[0007] Furthermore, the nano thermal insulation filler includes nano hollow ceramic microspheres and aerogel silica powder, wherein the nano hollow ceramic microspheres account for 15%-25% of the total weight of the raw materials, and the aerogel silica powder accounts for 10%-20% of the total weight of the raw materials.

[0008] Furthermore, the ion conduction enhancer is an alkali metal salt, and the binder is a polyurethane resin.

[0009] Furthermore, the functional additives include a defoamer and a dispersant, wherein the defoamer accounts for 0.5%-1% of the total weight of the raw materials, and the dispersant accounts for 1%-3% of the total weight of the raw materials.

[0010] Furthermore, the preparation method of the thermal insulation and cooling sheet is as follows: Raw material pretreatment: Perovskite solid electrolyte, nano hollow ceramic microbeads, and aerogel silica powder are placed in a ball mill for ball milling, and the alkali metal salt is crushed by a grinder and then sieved using a 300-500 mesh screen; Slurry preparation: Add the pretreated solid electrolyte matrix, nano thermal insulation filler, ion conductivity enhancer, binder, defoamer and dispersant and water into a high-speed mixer to fully mix the components; Cooling sheet molding: Use non-woven fabric as the base material, immerse it in the coating slurry for 3-8 minutes, and use the extrusion device to control the coating thickness between 0.5-2 mm and squeeze out the excess slurry; Drying and shaping: Place the coated substrate in an oven for drying to solidify the polyurethane resin and form a thermal insulation and cooling sheet with a stable structure; Post-processing: Place the dried thermal insulation and cooling sheet in an inert gas atmosphere for heat treatment to further optimize the crystal structure of the solid electrolyte.

[0011] Furthermore, in the raw material pretreatment, the perovskite solid electrolyte, nano hollow ceramic microbeads, and aerogel silica powder are respectively subjected to ball milling treatment at a ball milling speed of 400-600 rpm for 3-5 hours.

[0012] Furthermore, in the slurry preparation, the pretreated solid electrolyte matrix, nano-insulation filler, ion conductivity enhancer, binder, defoamer and dispersant are mixed with water, wherein water accounts for 20%-50% of the total weight of the raw materials, and stirred in a high-speed mixer at a speed of 1200-1800 rpm for 40-70 minutes to fully mix the components.

[0013] Furthermore, during the drying and shaping process, the coated substrate is placed in an oven and dried at a temperature of 160-185° C. for 10-20 minutes to solidify the polyurethane resin and form a heat-insulating and cooling sheet with a stable structure.

[0014] Furthermore, in the post-treatment, the dried thermal insulation and cooling sheet is heat-treated in an argon atmosphere at 300-400° C. for 2-4 hours to further optimize the crystal structure of the solid electrolyte.

[0015] Compared with the existing technology, the thermal insulation and cooling sheet made of this thermal insulation and cooling powder has the following beneficial effects: 1. The present invention uses an ion-conducting thermal insulation and cooling sheet to automatically adjust the insulation effect as the ambient temperature changes. When the external temperature rises, the ion migration rate in the solid electrolyte accelerates, converting part of the thermal energy into electrical potential energy, hindering heat conduction. When the temperature drops, the ion migration slows down, releasing the stored electrical potential energy to compensate for heat loss. At the same time, the solid electrolyte and nano-insulation filler work synergistically to significantly reduce the thermal conductivity of the material, and the energy conversion during the ion conduction process further enhances the insulation effect.

[0016] 2. The present invention significantly reduces the thermal conductivity of the material through the synergistic effect of solid electrolytes and nano-insulating fillers, and the energy conversion during ion conduction further enhances the thermal insulation effect. At the same time, the raw materials of the material are environmentally friendly and non-toxic, and have good flexibility, mechanical strength, durability, self-cleaning, corrosion resistance and waterproof properties, can adapt to a variety of complex environments, and the preparation method is highly feasible and easy to industrialize and mass-produce.

[0017] Other advantages, objects and features of the present invention will be described in part in the following description and, in part, will be apparent to those skilled in the art based on an examination of the following or may be learned from the practice of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0019] Figure 1 The present invention is a flow chart of a method for preparing a thermal insulation and cooling sheet made of thermal insulation and cooling powder. DETAILED DESCRIPTION

[0020] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0021] Comparative Example Ordinary ceramic microbeads are selected, accounting for 35% of the total weight of the raw materials, with an average particle size of 500-800 microns, a solid structure, and a relatively high thermal conductivity. Aerogel silica powder accounts for 15%, with a specific surface area of up to 800m² / g and a porosity of more than 90%, which reduces the overall thermal conductivity of the material. The binder is polyurethane resin, accounting for 20%, which is a two-component solvent-based polyurethane resin with good flexibility and bonding strength. After curing, the tensile strength can reach 15MPa and the elongation at break is 300%. The defoamer accounts for 0.8%, and a polyether-modified silicone defoamer is used, which can effectively eliminate bubbles generated during the slurry preparation process. The dispersant accounts for 1.2%, which is a polymer-type hyperdispersant that can effectively prevent the agglomeration of raw material particles and ensure the uniformity of the slurry. The solvent is water, and its addition amount is adjusted according to the actual situation to meet the needs of mixing the raw materials to form a slurry with appropriate viscosity. Ordinary ceramic microbeads and aerogel silica powder were placed in a mixer and mixed at a speed of 200 rpm for 15 minutes to achieve preliminary uniform mixing. In a stainless steel reactor, water accounting for 35% of the total weight of the raw materials was first added, and then the mixed ordinary ceramic microbeads, aerogel silica powder, polyurethane resin, defoaming agent and dispersant were added in sequence. The mixer was turned on and the stirring speed was set to 800 rpm. The mixture was stirred for 30 minutes. Due to the low stirring speed, the slurry uniformity was slightly poor, and the slurry viscosity was not strictly tested and adjusted. A polyester non-woven fabric with a gram weight of 80g / m² was selected as the base material and cut into a suitable size (50cm×50cm). The non-woven fabric was immersed in the coating slurry and taken out after soaking for 5 minutes. It was squeezed through a roller pressing device with a roller temperature of 25°C and a roller gap of 1 mm.

[0022] The coated non-woven fabric was placed in a hot air circulation oven, the temperature was set to 175°C, the heating rate was 5°C / min, and the drying was carried out for 15 minutes. During the drying process, a small amount of bubbles were found to remain on the surface of the coating. A high-temperature environment simulation box was used, the temperature was set to 80°C, and the thermal insulation material prepared in the comparative example was covered on the surface of the same aluminum box. The temperature change inside the box was recorded. After 1 hour, the temperature inside the box rose from the initial 25°C to 60°C. Compared with the box without thermal insulation material (the temperature rose to 65°C), the surface temperature of the object was only reduced by 15°C, and the thermal insulation effect was poor. When tested in a low-temperature environment simulation box (the temperature was set to -10°C), within 1 hour, the temperature inside the box dropped from 25°C to 22°C, while the temperature of the box without thermal insulation material dropped to 18°C, and the effect of reducing heat loss was not obvious.

[0023] Example 1 The solid electrolyte matrix is La0.9Sr0.1Ga0.8Mg0.2O3-δ, accounting for 35% of the total weight of the raw materials. The purity of the perovskite solid electrolyte has been tested to reach more than 99.5%, the crystal structure is complete, and the ionic conductivity at room temperature is 0.05S / cm, which provides a good foundation for subsequent ion conduction. Nano hollow ceramic microspheres account for 20%, with an average particle size of 50-80 nanometers, spherical, and a hollowness of 60%. Its low thermal conductivity and high specific surface area can effectively hinder heat transfer. Aerogel silica powder accounts for 15%, with a specific surface area of up to 800m² / g and a porosity of more than 90%, which can further reduce the overall thermal conductivity of the material and ion conduction enhancer. LiCl is selected, accounting for 8%. Analytically pure LiCl is selected, with uniform particle size. By adding it, the ion conduction path of the solid electrolyte can be optimized. The binder is selected from polyurethane resin, accounting for 20%. It is a two-component solvent-based polyurethane resin with good flexibility and bonding strength. After curing, the tensile strength can reach 15MPa and the elongation at break is 300%. The defoaming agent accounts for 0.8%. A polyether-modified silicone defoaming agent is used, which can effectively eliminate bubbles generated during the slurry preparation process. The dispersant accounts for 1.2%. It is a polymer-type hyperdispersant that can effectively prevent the agglomeration of raw material particles and ensure the uniformity of the slurry. The solvent is water, and its addition amount is adjusted according to the actual situation to meet the needs of mixing the raw materials to form a slurry with suitable viscosity.

[0024] like Figure 1As shown, La0.9Sr0.1Ga0.8Mg0.2O3-δ, nano hollow ceramic microbeads, and aerogel silica powder were placed in corresponding grinding jars of a planetary ball mill, respectively. An appropriate amount of zirconia grinding balls (the mass ratio of grinding balls to raw materials was 3:1) was added to each grinding jar. The ball mill speed was set to 500 rpm, and the ball milling was carried out for 4 hours. During the ball milling process, the machine was stopped every hour to check the grinding status of the raw materials to ensure uniform grinding effect. After the ball milling was completed, the raw materials were transferred to a clean sealed container for later use. LiCl was placed in a small crusher and crushed for 10 minutes. After passing through a 400-mesh sieve, the larger particles on the sieve were crushed and sieved again until all LiCl particles passed through the sieve. The powder under the sieve was collected for later use.

[0025] In a stainless steel reactor equipped with a stirring paddle and a thermometer, first add water accounting for 35% of the total weight of the raw materials, and then add the pretreated La0.9Sr0.1Ga0.8Mg0.2O3-δ, nano hollow ceramic microspheres, aerogel silica powder, LiCl, polyurethane resin, defoamer, and dispersant in that order. Start the high-speed stirrer and set the stirring speed to 1500 rpm. Observe the state of the slurry during stirring. If the temperature rises too quickly (over 40°C), pause stirring and continue stirring after the temperature drops to room temperature. The total stirring time is 55 minutes. After stirring, use a viscometer to check the slurry viscosity to ensure it is within the range of 2000-3000 mPa·s. If it does not meet the requirements, adjust the amount of water added appropriately.

[0026] A polyester non-woven fabric with a gram weight of 80g / m² was selected as the base material, cut into a suitable size (50cm×50cm), soaked in deionized water for 10 minutes, then taken out and the surface moisture was absorbed with a clean towel, and the treated non-woven fabric was immersed in the prepared coating slurry and soaked for 5 minutes. During this period, the non-woven fabric was gently shaken to ensure that it fully absorbed the slurry. After taking it out, it was squeezed through a pair of smooth-surfaced roller pressing equipment. The roller temperature of the roller pressing equipment was set to 25°C and the roller gap was adjusted to 1 mm to squeeze out excess slurry and make the coating evenly distributed on the surface of the non-woven fabric. Spread the coated non-woven fabric flat on a stainless steel tray and place it in a hot air circulation oven. Set the oven temperature to 175°C, the heating rate to 5°C / minute, and the drying time to 15 minutes. During the drying process, observe the coating status every 5 minutes to ensure that there is no bubbling, cracking, etc.

[0027] Place the dried thermal insulation cooling sheet in a high-temperature tubular furnace and introduce argon at a flow rate of 50 mL / min. After the air in the furnace is completely exhausted (confirmed by detecting that the oxygen content in the furnace is less than 0.1%), set the furnace temperature to 350°C, the heating rate to 3°C / min, and heat treat for 3 hours. After the heat treatment is completed, turn off the heating power supply and continue to introduce argon until the thermal insulation cooling sheet cools to room temperature.

[0028] A high-temperature environment simulation box was used and the temperature was set to 80°C. The thermal insulation and cooling sheet prepared in the embodiment was covered on the surface of an aluminum box with a size of 20cm×20cm×10cm. A temperature sensor was placed inside the box. Before the thermal insulation and cooling sheet was covered, the initial temperature inside the box was recorded. After covering, the internal temperature of the box was recorded every 10 minutes for 1 hour. The results showed that the internal temperature of the box rose from the initial 25°C to 39°C. Compared with the box without the thermal insulation and cooling sheet (the temperature rose to 65°C), the surface temperature decreased by 26°C. A low-temperature environment simulation box was used and the temperature was set to -10°C. The thermal insulation and cooling sheet was also covered on the surface of the aluminum box, and the temperature change inside the box was recorded. Within 1 hour, the internal temperature of the box dropped from 25°C to 17°C, while the temperature of the box without the thermal insulation and cooling sheet dropped to 49°C. It can be seen that the thermal insulation and cooling sheet can reduce heat loss by 32% in a low-temperature environment.

[0029] Example 2 The solid electrolyte matrix is La0.9Sr0.1Ga0.8Mg0.2O3-δ, accounting for 28% of the total weight of the raw materials, 22% of nano hollow ceramic microbeads and 18% of aerogel silica powder as nano thermal insulation fillers, KCL as an ion conduction enhancer, accounting for 7%, 22% of polyurethane resin as a binder, 0.7% of defoaming agent and 1.3% of dispersant as functional additives, and the rest is an appropriate amount of water to meet the preparation requirements.

[0030] La0.9Sr0.1Ga0.8Mg0.2O3-δ, nano hollow ceramic microbeads, and aerogel silica powder were placed in the corresponding grinding jars of a planetary ball mill, respectively. An appropriate amount of zirconia grinding balls (the mass ratio of grinding balls to raw materials was 3:1) was added to each grinding jar. The ball mill speed was set to 500 rpm and the ball milling was carried out for 4 hours. During the ball milling process, the machine was stopped every hour to check the grinding status of the raw materials to ensure uniform grinding effect. After the ball milling was completed, the raw materials were transferred to a clean sealed container for later use. LiCl was placed in a small crusher and crushed for 10 minutes. After passing through a 400-mesh sieve, the larger particles on the sieve were crushed and sieved again until all LiCl particles passed through the sieve. The powder under the sieve was collected for later use.

[0031] In a stainless steel reactor equipped with a stirring paddle and a thermometer, first add water accounting for 35% of the total weight of the raw materials, and then add the pretreated La0.9Sr0.1Ga0.8Mg0.2O3-δ, nano hollow ceramic microspheres, aerogel silica powder, LiCl, polyurethane resin, defoamer, and dispersant in that order. Start the high-speed stirrer and set the stirring speed to 1500 rpm. Observe the state of the slurry during stirring. If the temperature rises too quickly (over 40°C), pause stirring and continue stirring after the temperature drops to room temperature. The total stirring time is 55 minutes. After stirring, use a viscometer to check the slurry viscosity to ensure it is within the range of 2000-3000 mPa·s. If it does not meet the requirements, adjust the amount of water added appropriately.

[0032] A polyester non-woven fabric with a gram weight of 80g / m² was selected as the base material, cut into a suitable size (50cm×50cm), soaked in deionized water for 10 minutes, then taken out and the surface moisture was absorbed with a clean towel, and the treated non-woven fabric was immersed in the prepared coating slurry and soaked for 5 minutes. During this period, the non-woven fabric was gently shaken to ensure that it fully absorbed the slurry. After taking it out, it was squeezed through a pair of smooth-surfaced roller pressing equipment. The roller temperature of the roller pressing equipment was set to 25°C and the roller gap was adjusted to 1 mm to squeeze out excess slurry and make the coating evenly distributed on the surface of the non-woven fabric. Spread the coated non-woven fabric flat on a stainless steel tray and place it in a hot air circulation oven. Set the oven temperature to 175°C, the heating rate to 5°C / minute, and the drying time to 15 minutes. During the drying process, observe the coating status every 5 minutes to ensure that there is no bubbling, cracking, etc.

[0033] Place the dried thermal insulation cooling sheet in a high-temperature tubular furnace and introduce argon at a flow rate of 50 mL / min. After the air in the furnace is completely exhausted (confirmed by detecting that the oxygen content in the furnace is less than 0.1%), set the furnace temperature to 350°C, the heating rate to 3°C / min, and heat treat for 3 hours. After the heat treatment is completed, turn off the heating power supply and continue to introduce argon until the thermal insulation cooling sheet cools to room temperature.

[0034] A high temperature environment simulation box (model: HE-800) was used, with a set temperature of 85°C and a humidity of 60% RH. An aluminum plate with a size of 30cm×30cm×15cm was used as the test substrate. After evenly applying thermal grease on the surface of the aluminum plate, the thermal insulation and cooling sheet of Example 4 was covered. A T-type thermocouple was embedded inside the aluminum plate. When the thermal insulation and cooling sheet was not covered, the temperature of the aluminum plate rose to 78°C after 1 hour in the high temperature box. After covering, the temperature was recorded every 10 minutes and stabilized at 60°C after 1 hour. Compared with not using the thermal insulation and cooling sheet, the surface temperature was reduced by 18°C. A low temperature environment simulation box was used, with a set temperature of -12°C and a humidity of 40% RH. The aluminum plate was also used as the substrate. During the test, when the thermal insulation and cooling sheet was not used, the temperature of the aluminum plate dropped to -8°C after 1 hour. After covering the thermal insulation and cooling sheet, the temperature dropped to -11°C after 1 hour. It was calculated that heat loss can be reduced by 25%.

[0035] Example 3 The solid electrolyte matrix is La0.9Sr0.1Ga0.8Mg0.2O3-δ, which accounts for 28%-42% of the total weight of the raw materials, 13% of nano hollow ceramic microbeads and 15% of aerogel silica powder as nano thermal insulation fillers, 8% of LiCl as an ion conduction enhancer, 18% of polyurethane resin as a binder, 0.8% of defoamer and 1.2% of dispersant as functional additives, and the rest is an appropriate amount of water to meet the preparation requirements. The preparation process is exactly the same as that of Example 1. In a high-temperature environment simulation box, the temperature was set at 85°C and the humidity was 60% RH. An aluminum plate with a size of 30cm×30cm×15cm was used as a test substrate. After thermal grease was evenly applied to the surface of the aluminum plate, the thermal insulation and cooling sheet of Example 4 was covered. A T-type thermocouple was embedded inside the aluminum plate. When the thermal insulation and cooling sheet was not covered, the temperature of the aluminum plate rose to 78°C after 1 hour. After covering, the temperature stabilized at 46°C after 1 hour. Compared with not using the thermal insulation and cooling sheet, the surface temperature was reduced by 32°C. A low-temperature environment simulation box was used, the temperature was set at -12°C and the humidity was 40% RH. The aluminum plate was used as the substrate for testing. When the thermal insulation and cooling sheet was not used, the temperature of the aluminum plate dropped to -8°C after 1 hour. After covering the thermal insulation and cooling sheet, the temperature dropped to -13°C after 1 hour. It was calculated that heat loss can be reduced by 38%.

[0036] The performance analysis results of the above examples and comparative examples are shown in the following table: Comparison Project Example 1 Example 2 Example 3 Comparative Example Solid electrolyte matrix ratio 35％ 28％ 42％ 0％ Proportion of ion conduction enhancers 8％ 7％ 8％ 0％ Thermal insulation effect in high temperature environment Reduce the surface temperature of an object by 26°C Reduce the surface temperature of an object by 18°C Reduce the surface temperature of the object by 32℃ Reduce the surface temperature of an object by 15°C Thermal insulation effect in low temperature environment Reduce heat loss by 32% Reduce heat loss by 25% Reduce heat loss by 38% The effect of reducing heat loss is not obvious In summary, the present invention introduces a solid electrolyte matrix and an ion conduction enhancer into the insulation material to create an ion conduction insulation mechanism. This can reduce the surface temperature of an object by 18-32°C in a high-temperature environment and reduce heat loss by 25%-38% in a low-temperature environment. Furthermore, ionic conductivity increases with increasing amounts of the solid electrolyte matrix. This design enables the material to dynamically regulate heat transfer with temperature changes. At high temperatures, ion migration accelerates the conversion of thermal energy, while at low temperatures, energy is released to compensate for heat dissipation. Combined with nano-insulating fillers, efficient insulation is achieved.

[0037] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can, without departing from the scope of the technical solution of the present invention, make some changes or modifications to equivalent embodiments using the technical contents disclosed above. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A heat-insulating and cooling sheet made of heat-insulating and cooling powder, characterized in that: The weight proportions of the various components of the thermal insulation and cooling sheet are as follows: Solid electrolyte matrix 30%-40%; Nano thermal insulation filler 25%-45%; Ion conduction enhancer 5%-10%; Binder 10%-35%; Functional additives 1.5%-4%.

2. The heat-insulating and cooling sheet made of heat-insulating and cooling powder according to claim 1, characterized in that: The solid electrolyte matrix is a perovskite solid electrolyte, preferably La0.9Sr0.1Ga0.8Mg0.2O3-δ, whose crystal structure is ABO3 type, and the specific arrangement of A-site and B-site ions forms a channel that is conducive to ion conduction.

3. The heat-insulating and cooling sheet made of the heat-insulating and cooling powder according to claim 1, characterized in that: The nano thermal insulation filler comprises nano hollow ceramic microspheres and aerogel silicon dioxide powder, wherein the nano hollow ceramic microspheres account for 15%-25% of the total weight of the raw materials, and the aerogel silicon dioxide powder accounts for 10%-20% of the total weight of the raw materials.

4. The heat-insulating and cooling sheet made of heat-insulating and cooling powder according to claim 1, characterized in that: The ion conduction enhancer is an alkali metal salt, and the binder is a polyurethane resin.

5. The heat-insulating and cooling sheet made of heat-insulating and cooling powder according to claim 1, characterized in that: The functional auxiliary agent comprises a defoamer and a dispersant, wherein the defoamer accounts for 0.5%-1% of the total weight of the raw materials, and the dispersant accounts for 1%-3% of the total weight of the raw materials.

6. The heat-insulating and cooling sheet made of heat-insulating and cooling powder according to claim 1, characterized in that: The preparation method of the thermal insulation and cooling sheet is as follows: Raw material pretreatment: Perovskite solid electrolyte, nano hollow ceramic microbeads, and aerogel silica powder are placed in a ball mill for ball milling, and the alkali metal salt is crushed by a grinder and then sieved using a 300-500 mesh screen; Slurry preparation: Add the pretreated solid electrolyte matrix, nano thermal insulation filler, ion conductivity enhancer, binder, defoamer and dispersant and water into a high-speed mixer to fully mix the components; Cooling sheet molding: Use non-woven fabric as the base material, immerse it in the coating slurry for 3-8 minutes, and use the extrusion device to control the coating thickness between 0.5-2 mm and squeeze out the excess slurry; Drying and shaping: Place the coated substrate in an oven for drying to solidify the polyurethane resin and form a thermal insulation and cooling sheet with a stable structure; Post-processing: Place the dried thermal insulation and cooling sheet in an inert gas atmosphere for heat treatment to further optimize the crystal structure of the solid electrolyte.

7. The heat-insulating and cooling sheet made of the heat-insulating and cooling powder according to claim 6, characterized in that: In the raw material pretreatment, the perovskite solid electrolyte, nano hollow ceramic microbeads, and aerogel silica powder are respectively subjected to ball milling treatment at a ball milling speed of 400-600 rpm for 3-5 hours.

8. The heat-insulating and cooling sheet made of heat-insulating and cooling powder according to claim 6, characterized in that: In the slurry preparation, the pretreated solid electrolyte matrix, nano-insulation filler, ion conductivity enhancer, binder, defoamer and dispersant are mixed with water, wherein the water accounts for 20% to 50% of the total weight of the raw materials, and stirred in a high-speed blender at a speed of 1200 to 1800 rpm for 40 to 70 minutes to fully mix the components.

9. The heat-insulating and cooling sheet made of heat-insulating and cooling powder according to claim 6, characterized in that: During the drying and shaping process, the coated substrate is placed in an oven and dried at a temperature of 160-185° C. for 10-20 minutes to solidify the polyurethane resin and form a heat-insulating and cooling sheet with a stable structure.

10. The heat-insulating and cooling sheet made of heat-insulating and cooling powder according to claim 6, characterized in that: In the post-treatment, the dried thermal insulation and cooling sheet is heat-treated in an argon atmosphere at 300-400° C. for 2-4 hours to further optimize the crystal structure of the solid electrolyte.

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