A heat insulation and heat conduction integrated thermal control composite film

Abstract

The present invention relates to the field of composite materials, and particularly to a heat control composite film integrating heat insulation and heat conduction. The film comprises a first heat conduction layer, a heat insulation layer, and a second heat conduction layer which are sequentially stacked; both the first heat conduction layer and the second heat conduction layer are formed by stacking a plurality of composite heat conduction layers, and each composite heat conduction layer comprises a first metal layer, a second metal layer, and a composite graphene layer which are sequentially stacked; the composite graphene layer is composed of the following raw materials in parts by weight: 90 to 100 parts of graphene, 1 to 5 parts of diamond nanoparticles with a diameter of 5 to 20 nm, 1 to 5 parts of zinc oxide nanoparticles with a diameter of 5 to 30 nm, and 1 to 5 parts of titanium dioxide nanoparticles with a diameter of 10 to 30 nm; the heat insulation layer is a grid layer made of a metal nanomaterial composite polyester mesh or a metal nanomaterial composite nylon mesh. The present invention has a wide range of applications.

Description

Technical Field

[0001] The present invention relates to the field of thermal control materials, and particularly to a thermal control composite film integrating heat insulation and heat conduction. Background Art

[0002] With the continuous improvement of people's living standards, when facing high-temperature weather, people will take various measures for refrigeration to achieve the purpose of cooling. However, traditional refrigeration methods (such as air conditioners and electric fans) consume a large amount of energy. According to the estimation of the International Energy Agency, the current electricity consumption for refrigeration has accounted for more than 10% of the total global electricity consumption, and it is even as high as 50% during the peak refrigeration period in summer. Moreover, this data shows an increasing trend year by year. The relevant prediction of future energy consumption in the construction industry indicates that after 2050, refrigeration will become the main energy usage method, and the energy consumption generated by refrigeration demand will far exceed the energy consumption generated by heating demand. This will bring two serious problems: First, the national power system needs to bear a serious pressure. The extremely high energy consumption forces the government to build more power plants to meet the total energy demand. In addition, due to the extremely large peak consumption during peak air-conditioning usage periods such as at night, the government is forced to invest more funds to upgrade the power grid system and build standby generators, etc. Second, environmental pollution is aggravated. Most developing countries mainly rely on thermal power generation, and thermal power generation will inevitably produce various emissions. Moreover, the fluorine-containing refrigerants commonly used in air conditioners will also damage the ozone layer.

[0003] To improve the problems brought by the above situation, people have been researching new refrigeration approaches, which can be divided into active refrigeration and passive refrigeration. Currently, with the development of materials science, researchers are also deeply researching active refrigeration functional materials to achieve "green refrigeration". Active refrigeration materials are one of the new refrigeration approaches with zero pollution and zero emissions. These materials usually have special photothermal, electrothermal, magnetothermal and other properties, and will absorb and release heat when stimulated by the outside world, without any energy input, and have the potential to replace traditional high-energy consumption refrigeration technologies.

[0004] However, in order to meet different application requirements, active refrigeration materials usually need to use a variety of thermal control thin film materials to meet the requirements of thermal design. Currently, companies such as Sheldahl and OCLI in the United States have achieved serialization of thermal control thin film materials and can be applied in some different occasions. However, the performance of such thermal control thin film materials usually strongly depends on the type of substrate material. Therefore, such thermal control thin film materials cannot be directly deposited on the surface of workpieces and can only be pasted or wrapped on the surface of spacecraft for use. And because the performance of existing thermal control thin film materials depends on the type of substrate material, the adjustable range of the solar absorptance (αs) and infrared emissivity (ε) of existing thermal control thin film materials is small, and the applicable occasions are few. Summary of the Invention

[0005] In view of the problems existing in the above-mentioned prior art, the purpose of the present invention is to provide a heat insulation and heat conduction integrated thermal control composite film with a wide application range.

[0006] The technical solution adopted by the present invention is as follows: Provide a heat insulation and heat conduction integrated thermal control composite film, which includes a first heat conduction layer, a heat insulation layer, and a second heat conduction layer stacked in sequence;

[0007] Both the first heat conduction layer and the second heat conduction layer are composed of several composite heat conduction layers stacked and symmetrically arranged. The composite heat conduction layer includes a first metal layer, a second metal layer, and a composite graphene layer stacked in sequence;

[0008] The composite graphene layer is composed of the following raw materials by weight: 90-100 parts of graphene, 1-5 parts of diamond nanoparticles with a diameter of 5-20 nm, 1-5 parts of zinc oxide nanoparticles with a diameter of 5-30 nm, and 1-5 parts of titanium dioxide nanoparticles with a diameter of 10-30 nm;

[0009] The heat insulation layer is a grid layer made of a metal nanomaterial composite polyester mesh or a metal nanomaterial composite nylon mesh.

[0010] Further, both the first heat conduction layer and the second heat conduction layer are composed of 1-50 layers of composite heat conduction layers stacked.

[0011] Further, the first metal layer is a silver layer or an aluminum layer with a thickness of 50-200 nm; the second metal layer is a nickel layer or a cadmium layer with a thickness of 5-100 nm.

[0012] Further, the metal nanomaterial in the metal nanomaterial composite polyester mesh or the metal nanomaterial composite nylon mesh is composed of the following raw materials by weight: 1-5 parts of modified zinc oxide nanoparticles with a diameter of 5-30 nm and 1-5 parts of modified titanium dioxide nanoparticles with a diameter of 10-30 nm.

[0013] Further, the thickness of the composite graphene layer is 5-300 μm, and the surface thermal conductivity is 2500-15000 W / K·m.

[0014] The beneficial effects of the present invention are:

[0015] (1) The applicable scope of the present invention is wide. The present invention includes a first heat-conducting layer, a heat-insulating layer, and a second heat-conducting layer that are sequentially stacked. Both the first heat-conducting layer and the second heat-conducting layer are formed by stacking several composite heat-conducting layers. The composite heat-conducting layer includes a first metal layer, a second metal layer, and a composite graphene layer that are sequentially stacked. The composite graphene layer is composed of the following raw materials in parts by weight: 90-100 parts of graphene, 1-5 parts of diamond nanoparticles with a diameter of 5-20 nm, 1-5 parts of zinc oxide nanoparticles with a diameter of 5-30 nm, and 1-5 parts of titanium dioxide nanoparticles with a diameter of 10-30 nm. The heat-insulating layer is a grid layer made of a metal nano-material composite polyester mesh or a metal nano-material composite nylon mesh. By adjusting the amount of the metal nano-material in the first heat-conducting layer, the second heat-conducting layer, and the heat-insulating layer, the solar absorptance (αs) and the infrared emissivity (ε) can be changed. Therefore, the thermal control parameters of the present invention can be designed according to different requirements, and the adjustable range is large. Moreover, the present invention does not require a substrate, and its performance will not be limited by the substrate material. Therefore, the adaptability and pertinence of the present invention are relatively strong, and the applicable scope is relatively wide.

[0016] (2) The present invention has a high heat conductivity and a large heat-conducting area, and can quickly and accurately perform thermal control adjustment within a wide temperature range. Both the first heat-conducting layer and the second heat-conducting layer of the present invention are formed by stacking several composite heat-conducting layers. Therefore, they have a high heat conductivity and a large heat-conducting area, so that heat conduction adjustment can be performed at a higher temperature or a lower temperature, and heat is conducted through the first heat-conducting layer and the second heat-conducting layer to complete the thermal control adjustment.

[0017] (4) The first heat-conducting layer and the second heat-conducting layer of the present invention can conduct heat at different heat conduction rates, that is, different thermal controls can be performed. The present invention includes a first heat-conducting layer, a heat-insulating layer, and a second heat-conducting layer that are sequentially stacked. Both the first heat-conducting layer and the second heat-conducting layer are formed by stacking several composite heat-conducting layers. Therefore, by changing the number of layers of the composite heat-conducting layer, the heat conduction rate of the heat-conducting layer can be adjusted. Moreover, a heat-insulating layer is provided between the first heat-conducting layer and the second heat-conducting layer, so that the two heat-conducting layers can independently conduct heat and perform different thermal controls. Description of the Drawings

[0018] Figure 1 is a schematic structural diagram of the present invention;

[0019] Figure 2 is a graph of the tensile strength and tensile yield stress of Examples 1-7 of the present invention.

[0020] The corresponding names of the icons in the drawings are: 1 - first heat-conducting layer, 2 - heat-insulating layer, 3 - second heat-conducting layer, 4 - composite heat-conducting layer. Specific Embodiments

[0021] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0022] As Figure 1 shown, a heat insulation and heat conduction integrated thermal control composite film provided by the present invention includes a first heat conduction layer 1, a heat insulation layer 2, and a second heat conduction layer 3 which are sequentially stacked. Both the first heat conduction layer 1 and the second heat conduction layer 3 are formed by stacking a plurality of composite heat conduction layers 4, and are symmetrically arranged. The composite heat conduction layer includes a first metal layer, a second metal layer, and a composite graphene layer which are sequentially stacked. The in-plane thermal conductivity of the composite graphene layer ranges from 2500 to 15000 W / K·m.

[0023] The specific preparation steps of a heat insulation and heat conduction integrated thermal control composite film provided by the present invention are as follows:

[0024] (1) Prepare the first heat conduction layer and the second heat conduction layer

[0025] ① Prepare the composite graphene layer: Prepare 90 - 100 parts by weight of graphene, mix 1 - 5 parts of diamond nanoparticles with a diameter of 5 - 20 nm, 1 - 5 parts of zinc oxide nanoparticles with a diameter of 5 - 30 nm, and 1 - 5 parts of titanium dioxide nanoparticles with a diameter of 10 - 30 nm, and then sputter them on the graphene to form a composite graphene layer. When sputtering, the magnetron sputtering method is used, and the specific parameters are: the protective atmosphere is argon, and the argon flow rate is 30 - 40 mL / min; the reaction gas is nitrogen, and the nitrogen flow rate is 1 - 2 mL / min, the working pressure is 0.5 - 1.0 Pa, the titanium target sputtering power is 100 - 200 W, the sputtering temperature is 400 - 500 °C, and a composite graphene layer with a thickness of 5 - 300 μm is formed.

[0026] ② Prepare the composite heat conduction layer: Subsequently, use the magnetron sputtering method to deposit a silver layer or an aluminum layer with a thickness of 50 - 200 nm on the above composite graphene layer with parameters of a radio frequency power of 300 W, a substrate temperature of 200 °C, an Ar pressure of 0.4 pa, and a deposition time of 120 min, and deposit a cadmium layer or a nickel layer with a thickness of 5 - 100 nm on the silver layer or the aluminum layer.

[0027] ③ Prepare the first heat conduction layer: The first heat conduction layer is obtained by depositing 1 - 50 layers of the composite heat conduction layer layer by layer using steps ① - ②;

[0028] ④ Prepare the second heat conduction layer: The second heat conduction layer is obtained by depositing 1 - 50 layers of the composite heat conduction layer layer by layer using steps ① - ②.

[0029] (2) Prepare the heat insulation layer

[0030] Take 1 to 5 parts of chemically modified zinc oxide nanoparticles with a diameter of 5 to 30 nm and 1 to 5 parts of chemically modified titanium dioxide nanoparticles with a diameter of 10 to 30 nm. Using the method of magnetron sputtering with parameters of radio frequency power of 500 W, substrate temperature of 200 °C, Ar pressure of 0.8 Pa, and deposition time of 200 min, deposit the nanoparticles onto a nylon mesh or a polyester mesh to obtain a heat insulation layer.

[0031] (3) Prepare a heat control composite film with integrated heat insulation and heat conduction

[0032] Place the above-mentioned second heat conduction layer, heat insulation layer, and first heat conduction layer into a film pressing machine in sequence. The second heat conduction layer and the first heat conduction layer are symmetrically arranged. Adjust the distance between the rollers to 500 microns, set the rotation speed to 1 r / min, the temperature to 25 °C, and the output pressure to 0.8 tons. After pressing, obtain a heat control composite film.

[0033] The comprehensive performance of a heat control composite film with integrated heat insulation and heat conduction provided by the present invention can be jointly determined by its own solar absorptance (αs) and infrared emittance (ε). Usually, the absorptance ratio (αs / ε) is introduced to evaluate the heating and cooling degrees of the coating on the substrate material. The relationship between the solar absorptance (αs) and the infrared emittance (ε) is shown in the following formula:

[0034]

[0035] In the formula:

[0036] T is the equilibrium temperature of the material surface, with the unit of K;

[0037] S0 is the solar constant, S0 = 1367 W / m 2 ;

[0038] σ is the Stefan-Boltzmann constant, σ = 5.67×10 -8 W / (m 2 ·K 4 );

[0039] A P is the projected area of the film perpendicular to the plane of sunlight, with the unit of m 2 ;

[0040] A is the outer surface area of the film, with the unit of m 2 ;

[0041] αS is the solar absorptance; ε is the infrared emittance.

[0042]

Example 1

[0043] (1) Prepare the first heat conduction layer and the second heat conduction layer

[0044] ① Preparation of composite graphene layer: Prepare 90 parts by weight of graphene. Mix 1 part of diamond nanoparticles with a diameter of 10 nm, 2 parts of zinc oxide nanoparticles with a diameter of 5 nm, and 2 parts of titanium dioxide nanoparticles with a diameter of 15 nm, and then sputter them into the graphene to form a composite graphene layer. The magnetron sputtering method is used during sputtering, and the specific parameters are as follows: The protective atmosphere is argon, and the argon flow rate is 30 mL / min; the reaction gas is nitrogen, and the nitrogen flow rate is 1 mL / min. The working pressure is 0.5 Pa, the sputtering power of the titanium target is 100 W, and the sputtering temperature is 400 °C, to form a composite graphene layer with a thickness of 5 μm.

[0045] ② Preparation of composite heat-conducting layer: Subsequently, use the magnetron sputtering method to deposit a silver layer with a thickness of 50 on the above-mentioned composite graphene layer with parameters of radio frequency power of 300 W, substrate temperature of 200 °C, Ar pressure of 0.4 pa, and deposition time of 120 min, and deposit a cadmium layer with a thickness of 5 nm on the silver layer.

[0046] ③ Preparation of the first heat-conducting layer: The first heat-conducting layer is obtained by layer-by-layer depositing 5 layers of composite heat-conducting layers using steps ① to ②;

[0047] ④ Preparation of the second heat-conducting layer: The second heat-conducting layer is obtained by layer-by-layer depositing 5 layers of composite heat-conducting layers using steps ① to ②.

[0048] (2) Preparation of heat-insulating layer

[0049] Take 1 part of chemically modified zinc oxide nanoparticles with a diameter of 5 nm and 1 part of chemically modified titanium dioxide nanoparticles with a diameter of 10 nm, and use the magnetron sputtering method with parameters of radio frequency power of 500 W, substrate temperature of 200 °C, Ar pressure of 0.8 pa, and deposition time of 200 min to deposit the nanoparticles onto a nylon mesh to obtain a heat-insulating layer.

[0050] (3) Preparation of heat-insulating and heat-conducting integrated thermal control composite film

[0051] Place the above-mentioned second heat-conducting layer, heat-insulating layer, and first heat-conducting layer into a laminating machine in sequence. The second heat-conducting layer and the first heat-conducting layer are symmetrically arranged. Adjust the distance between the rollers to 500 microns, set the rotation speed to 1 r / min, the temperature to 25 °C, and the output pressure to 0.8 tons. After pressing, a thermal control composite film is obtained.

[0052]

Example 2

[0053] (1) Preparation of the first heat-conducting layer and the second heat-conducting layer

[0054] ① Preparation of composite graphene layer: Prepare 90 parts by weight of graphene. Mix 1 part of diamond nanoparticles with a diameter of 10 nm, 2 parts of zinc oxide nanoparticles with a diameter of 10 nm, and 2 parts of titanium dioxide nanoparticles with a diameter of 15 nm, and then sputter them onto the graphene to form a composite graphene layer. The magnetron sputtering method is used during sputtering, and the specific parameters are as follows: The protective atmosphere is argon, and the argon flow rate is 40 mL / min; the reaction gas is nitrogen, and the nitrogen flow rate is 2 mL / min. The working pressure is 1.0 Pa, the sputtering power of the titanium target is 200 W, and the sputtering temperature is 500 °C, to form a composite graphene layer with a thickness of 300 μm.

[0055] ② Preparation of composite heat-conducting layer: Subsequently, use the magnetron sputtering method to deposit an aluminum layer with a thickness of 50 nm on the above composite graphene layer with parameters of radio frequency power of 300 W, substrate temperature of 200 °C, Ar pressure of 0.4 pa, and deposition time of 120 min, and then deposit a nickel layer with a thickness of 5 nm on the aluminum layer.

[0056] ③ Preparation of the first heat-conducting layer: The first heat-conducting layer is obtained by layer-by-layer depositing 50 layers of the composite heat-conducting layer using steps ① to ②;

[0057] ④ Preparation of the second heat-conducting layer: The second heat-conducting layer is obtained by layer-by-layer depositing 50 layers of the composite heat-conducting layer using steps ① to ②.

[0058] (2) Preparation of the heat-insulating layer

[0059] Take 1 part of chemically modified zinc oxide nanoparticles with a diameter of 5 nm and 1 part of chemically modified titanium dioxide nanoparticles with a diameter of 10 nm, and use the magnetron sputtering method with parameters of radio frequency power of 500 W, substrate temperature of 200 °C, Ar pressure of 0.8 pa, and deposition time of 200 min to deposit the nanoparticles onto the polyester mesh to obtain the heat-insulating layer.

[0060] (3) Preparation of the heat-insulating and heat-conducting integrated thermal control composite film

[0061] Place the above second heat-conducting layer, heat-insulating layer, and first heat-conducting layer into a film pressing machine in sequence. The second heat-conducting layer and the first heat-conducting layer are symmetrically arranged. Adjust the distance between the rollers to 500 microns, set the rotation speed to 1 r / min, the temperature to 25 °C, and the output pressure to 0.8 tons. After pressing, the thermal control composite film is obtained.

[0062]

Example 3

[0063] (1) Preparation of the first heat-conducting layer and the second heat-conducting layer

[0064] ① Preparation of composite graphene layer: Prepare 100 parts of graphene by weight. Mix 5 parts of diamond nanoparticles with a diameter of 10 nm, 5 parts of zinc oxide nanoparticles with a diameter of 10 nm, and 5 parts of titanium dioxide nanoparticles with a diameter of 15 nm, and then sputter them into the graphene to form a composite graphene layer. The magnetron sputtering method is used during sputtering, and the specific parameters are as follows: The protective atmosphere is argon, and the argon flow rate is 35 mL / min; the reaction gas is nitrogen, and the nitrogen flow rate is 1.5 mL / min. The working pressure is 0.7 Pa, the sputtering power of the titanium target is 150 W, and the sputtering temperature is 450 °C, to form a composite graphene layer with a thickness of 5 μm.

[0065] ② Preparation of composite heat-conducting layer: Subsequently, use the magnetron sputtering method with parameters of a radio frequency power of 300 W, a substrate temperature of 200 °C, an Ar pressure of 0.4 pa, and a deposition time of 120 min to deposit a silver layer with a thickness of 50 m on the above composite graphene layer, and then deposit a cadmium layer with a thickness of 5 nm on the silver layer.

[0066] ③ Preparation of the first heat-conducting layer: The first heat-conducting layer is obtained by depositing 50 layers of the composite heat-conducting layer layer by layer using steps ① - ②;

[0067] ④ Preparation of the second heat-conducting layer: The second heat-conducting layer is obtained by depositing 50 layers of the composite heat-conducting layer layer by layer using steps ① - ②.

[0068] (2) Preparation of the heat-insulating layer

[0069] Take 1 part of chemically modified zinc oxide nanoparticles with a diameter of 5 nm and 1 part of chemically modified titanium dioxide nanoparticles with a diameter of 10 nm, and use the magnetron sputtering method with parameters of a radio frequency power of 500 W, a substrate temperature of 200 °C, an Ar pressure of 0.8 pa, and a deposition time of 200 min to deposit the nanoparticles onto a nylon mesh or a polyester mesh to obtain the heat-insulating layer.

[0070] (3) Preparation of the heat-insulating and heat-conducting integrated thermal control composite film

[0071] Place the above second heat-conducting layer, heat-insulating layer, and first heat-conducting layer into a laminating machine in sequence. The second heat-conducting layer and the first heat-conducting layer are symmetrically arranged. Adjust the distance between the rollers to 500 microns, set the rotation speed to 1 r / min, the temperature to 25 °C, and the output pressure to 0.8 tons. After pressing, the thermal control composite film is obtained.

[0072]

Example 4

[0073] (1) Preparation of the first heat-conducting layer and the second heat-conducting layer

[0074] ① Preparation of composite graphene layer: Prepare 95 parts by weight of graphene. Mix 2 parts of diamond nanoparticles with a diameter of 5 nm, 1 part of zinc oxide nanoparticles with a diameter of 17 nm, and 1 part of titanium dioxide nanoparticles with a diameter of 10 nm, and then sputter them into the graphene to form a composite graphene layer. The magnetron sputtering method is used during sputtering, and the specific parameters are as follows: The protective atmosphere is argon, and the argon flow rate is 35 mL / min; the reaction gas is nitrogen, and the nitrogen flow rate is 1.5 mL / min. The working pressure is 0.8 Pa, the sputtering power of the titanium target is 150 W, and the sputtering temperature is 450 °C, to form a composite graphene layer with a thickness of 152 μm.

[0075] ② Preparation of composite heat-conducting layer: Subsequently, use the magnetron sputtering method with parameters of a radio frequency power of 300 W, a substrate temperature of 200 °C, an Ar pressure of 0.4 pa, and a deposition time of 120 min to deposit a silver layer with a thickness of 200 nm on the above composite graphene layer, and then deposit a cadmium layer with a thickness of 100 nm on the silver layer.

[0076] ③ Preparation of the first heat-conducting layer: The first heat-conducting layer is obtained by depositing 1 layer of the composite heat-conducting layer layer by layer using steps ① to ②.

[0077] ④ Preparation of the second heat-conducting layer: The second heat-conducting layer is obtained by depositing 1 layer of the composite heat-conducting layer layer by layer using steps ① to ②.

[0078] (2) Preparation of heat-insulating layer

[0079] Take 25 parts of chemically modified zinc oxide nanoparticles with a diameter of 17 nm and 2 parts of chemically modified titanium dioxide nanoparticles with a diameter of 20 nm, and use the magnetron sputtering method with parameters of a radio frequency power of 500 W, a substrate temperature of 200 °C, an Ar pressure of 0.8 pa, and a deposition time of 200 min to deposit the nanoparticles onto a nylon mesh to obtain a heat-insulating layer.

[0080] (3) Preparation of heat-insulating and heat-conducting integrated thermal control composite film

[0081] Place the above second heat-conducting layer, heat-insulating layer, and first heat-conducting layer into a laminating machine in sequence. The second heat-conducting layer and the first heat-conducting layer are symmetrically arranged. Adjust the distance between the rollers to 500 microns, set the rotation speed to 1 r / min, the temperature to 25 °C, and the output pressure to 0.8 tons. After pressing, a thermal control composite film is obtained.

[0082]

Example 5

[0083] (1) Preparation of the first heat-conducting layer and the second heat-conducting layer

[0084] ① Preparation of composite graphene layer: Prepare 100 parts of graphene by weight. Mix 3 parts of diamond nanoparticles with a diameter of 20 nm, 35 parts of zinc oxide nanoparticles with a diameter of 30 nm, and 3 parts of titanium dioxide nanoparticles with a diameter of 30 nm, and then sputter them onto the graphene to form a composite graphene layer. The magnetron sputtering method is used during sputtering. The specific parameters are as follows: The protective atmosphere is argon, and the argon flow rate is 30 mL / min; the reaction gas is nitrogen, and the nitrogen flow rate is 1 mL / min. The working pressure is 0.5 Pa, the sputtering power of the titanium target is 100 W, and the sputtering temperature is 400 °C. A composite graphene layer with a thickness of 153 μm is formed.

[0085] ② Preparation of composite heat-conducting layer: Subsequently, using the magnetron sputtering method with parameters of a radio frequency power of 300 W, a substrate temperature of 200 °C, an Ar pressure of 0.4 pa, and a deposition time of 120 min, deposit an aluminum layer with a thickness of 125 nm on the above composite graphene layer, and then deposit a cadmium layer with a thickness of 100 nm on the aluminum layer.

[0086] ③ Preparation of the first heat-conducting layer: The first heat-conducting layer is obtained by layer-by-layer depositing 25 layers of the composite heat-conducting layer using steps ① to ②.

[0087] ④ Preparation of the second heat-conducting layer: The second heat-conducting layer is obtained by layer-by-layer depositing 25 layers of the composite heat-conducting layer using steps ① to ②.

[0088] (2) Preparation of the heat-insulating layer

[0089] Take 3 parts of chemically modified zinc oxide nanoparticles with a diameter of 30 nm and 3 parts of chemically modified titanium dioxide nanoparticles with a diameter of 30 nm, and use the magnetron sputtering method with parameters of a radio frequency power of 500 W, a substrate temperature of 200 °C, an Ar pressure of 0.8 pa, and a deposition time of 200 min to deposit the nanoparticles onto a polyester mesh to obtain the heat-insulating layer.

[0090] (3) Preparation of the heat-insulating and heat-conducting integrated thermal control composite film

[0091] Place the above second heat-conducting layer, heat-insulating layer, and first heat-conducting layer into a film press in sequence. The second heat-conducting layer and the first heat-conducting layer are symmetrically arranged. Adjust the distance between the rollers to 500 microns, set the rotation speed to 1 r / min, the temperature to 25 °C, and the output pressure to 0.8 tons. After pressing, the thermal control composite film is obtained.

[0092]

Example 6

[0093] (1) Preparation of the first heat-conducting layer and the second heat-conducting layer

[0094] ① Preparation of composite graphene layer: Prepare 95 parts by weight of graphene. Mix 3 parts of diamond nanoparticles with a diameter of 12 nm, 3 parts of zinc oxide nanoparticles with a diameter of 18 nm, and 5 parts of titanium dioxide nanoparticles with a diameter of 20 m, and then sputter them onto the graphene to form a composite graphene layer. The magnetron sputtering method is used during sputtering, and the specific parameters are as follows: the protective atmosphere is argon, and the argon flow rate is 40 mL / min; the reaction gas is nitrogen, and the nitrogen flow rate is 1 mL / min, the working pressure is 1.0 Pa, the sputtering power of the titanium target is 100 W, the sputtering temperature is 500 °C, and a composite graphene layer with a thickness of 10 μm is formed.

[0095] ② Preparation of composite heat-conducting layer: Subsequently, use the magnetron sputtering method to deposit an aluminum layer with a thickness of 125 nm on the above composite graphene layer with parameters of a radio frequency power of 300 W, a substrate temperature of 200 °C, an Ar pressure of 0.4 pa, and a deposition time of 120 min, and then deposit a cadmium layer with a thickness of 102 nm on the aluminum layer.

[0096] ③ Preparation of the first heat-conducting layer: The first heat-conducting layer is obtained by depositing 26 layers of the composite heat-conducting layer layer by layer using steps ① to ②.

[0097] ④ Preparation of the second heat-conducting layer: The second heat-conducting layer is obtained by depositing 26 layers of the composite heat-conducting layer layer by layer using steps ① to ②.

[0098] (2) Preparation of heat-insulating layer

[0099] Take 5 parts of chemically modified zinc oxide nanoparticles with a diameter of 18 nm and 5 parts of chemically modified titanium dioxide nanoparticles with a diameter of 25 nm, and use the magnetron sputtering method with parameters of a radio frequency power of 500 W, a substrate temperature of 200 °C, an Ar pressure of 0.8 pa, and a deposition time of 200 min to deposit the nanoparticles onto a nylon mesh or a polyester mesh to obtain a heat-insulating layer.

[0100] (3) Preparation of heat-insulating and heat-conducting integrated thermal control composite film

[0101] Place the above second heat-conducting layer, heat-insulating layer, and first heat-conducting layer into a film pressing machine in sequence. The second heat-conducting layer and the first heat-conducting layer are symmetrically arranged. Adjust the distance between the rollers to 500 microns, set the rotation speed to 1 r / min, the temperature to 25 °C, and the output pressure to 0.8 tons. After pressing, a thermal control composite film is obtained.

[0102]

Example 7

[0103] (1) Preparation of the first heat-conducting layer and the second heat-conducting layer

[0104] ① Preparation of composite graphene layer: Prepare 100 parts by weight of graphene. Mix 4 parts of diamond nanoparticles with a diameter of 13 nm, 3 parts of zinc oxide nanoparticles with a diameter of 20 nm, and 4 parts of titanium dioxide nanoparticles with a diameter of 15 nm, and then sputter them onto the graphene to form a composite graphene layer. The magnetron sputtering method is used during sputtering, and the specific parameters are as follows: The protective atmosphere is argon, and the argon flow rate is 40 mL / min; the reaction gas is nitrogen, and the nitrogen flow rate is 2 mL / min. The working pressure is 0.5 Pa, the sputtering power of the titanium target is 100 W, and the sputtering temperature is 500 °C to form a composite graphene layer with a thickness of 200 μm.

[0105] ② Preparation of composite heat-conducting layer: Subsequently, use the magnetron sputtering method with parameters of a radio frequency power of 300 W, a substrate temperature of 200 °C, an Ar pressure of 0.4 pa, and a deposition time of 120 min to deposit a silver layer with a thickness of 100 nm on the above composite graphene layer, and then deposit a cadmium layer with a thickness of 50 nm on the silver layer.

[0106] ③ Preparation of the first heat-conducting layer: The first heat-conducting layer is prepared by layer-by-layer depositing 30 layers of the composite heat-conducting layer using steps ① to ②;

[0107] ④ Preparation of the second heat-conducting layer: The second heat-conducting layer is prepared by layer-by-layer depositing 30 layers of the composite heat-conducting layer using steps ① to ②.

[0108] (2) Preparation of heat-insulating layer

[0109] Take 4 parts of chemically modified zinc oxide nanoparticles with a diameter of 20 nm and 5 parts of chemically modified titanium dioxide nanoparticles with a diameter of 15 nm, and use the magnetron sputtering method with parameters of a radio frequency power of 500 W, a substrate temperature of 200 °C, an Ar pressure of 0.8 pa, and a deposition time of 200 min to deposit the nanoparticles onto a nylon mesh or a polyester mesh to obtain a heat-insulating layer.

[0110] (3) Preparation of heat-insulating and heat-conducting integrated thermal control composite film

[0111] Place the above second heat-conducting layer, heat-insulating layer, and first heat-conducting layer into a film pressing machine in sequence. The second heat-conducting layer and the first heat-conducting layer are symmetrically arranged. Adjust the distance between the rollers to 500 microns, set the rotation speed to 1 r / min, the temperature to 25 °C, and the output pressure to 0.8 tons. After pressing, a thermal control composite film is obtained.

[0112] Take the above Examples 1 to 3, and use a dynamic thermomechanical analyzer to test the thermal conductivity and the heat insulation rate of the intermediate heat-insulating layer; obtain the solar absorptance and the infrared emissivity of the examples according to the film material and structure through Equation 1, and calculate the absorption-radiation ratio; use a mechanical tester to test the tensile strength and surface tension; use an extinction technology tester to test the absorption extinction coefficient, record and summarize to obtain Table 1 and Figure 2 .

[0113]

[0114] Table 1 Test results of Examples 1 to 7

[0115] It can be seen from Table 1 and Figure 2 analysis that as the number of graphene layers increases and the proportion of metal nanomaterials in the first heat-conducting layer, heat-insulating layer and second heat-conducting layer increases, the thermal conductivity, solar absorptance ratio, tensile strength and surface tension of the examples increase, and the absorption extinction coefficient increases. Among them, the equilibrium temperature on the surface of the thermal control film is positively correlated with the solar absorptance ratio (αs / ε); the tensile strength and surface tension represent the physical and mechanical properties of the film and will affect the service life of the film; the higher the absorption extinction coefficient, the better the thermal control effect of the film. The heat insulation rate affects the ability of the upper and lower layers of the film for independent thermal control. The heat insulation rate of the intermediate heat-insulating layer in Examples 1 to 3 is 70%, and the value is good. Generally speaking, the heat-insulating and heat-conducting integrated thermal control composite film prepared by the present invention has good comprehensive performance.

Claims

1. An integrated thermal control composite film with heat insulation and heat conduction, characterized in that It includes a first heat-conducting layer (1), a heat-insulating layer (2), and a second heat-conducting layer (3) which are stacked in sequence; both the first heat-conducting layer (1) and the second heat-conducting layer (3) are formed by stacking a plurality of composite heat-conducting layers (4), and are symmetrically arranged. The composite heat-conducting layer includes a first metal layer, a second metal layer, and a composite graphene layer which are stacked in sequence. The composite graphene layer is composed of the following raw materials by weight: 90-100 parts of graphene, 1-5 parts of diamond nanoparticles with a diameter of 5-20 nm, 1-5 parts of zinc oxide nanoparticles with a diameter of 5-30 nm, and 1-5 parts of titanium dioxide nanoparticles with a diameter of 10-30 nm. The heat-insulating layer (2) is a grid layer made of a metal nanomaterial composite polyester mesh or a metal nanomaterial composite nylon mesh.

2. The integrated thermal control composite film for heat insulation and heat conduction according to claim 1, characterized in that, Both the first heat-conducting layer (1) and the second heat-conducting layer (3) are formed by stacking 1-50 composite heat-conducting layers (4).

3. The integrated thermal control composite film with heat insulation and heat conduction according to claim 1 or 2, characterized in that The first metal layer is a silver layer or an aluminum layer with a thickness of 50-200 nm; the second metal layer is a nickel layer or a cadmium layer with a thickness of 5-100 nm.

4. The integrated thermal control composite film with heat insulation and heat conduction according to claim 1 or 2, characterized in that The metal nanomaterials in the metal nanomaterial composite polyester mesh or the metal nanomaterial composite nylon mesh are composed of the following raw materials in parts by weight: 1 to 5 parts of zinc oxide nanoparticles with a diameter of 5 to 30 nm modified and 1 to 5 parts of titanium dioxide nanoparticles with a diameter of 10 to 30 nm modified.

5. The integrated thermal control composite film with heat insulation and heat conduction according to claim 1 or 2, characterized in that, The thickness of the composite graphene layer is 5-300 μm, and the surface heat conductivity is 2500-15000 W / K·m.

Images