High-temperature thermal insulation composite material and preparation method and application thereof

Abstract

The application provides a high-temperature heat-insulating composite material and a preparation method and application thereof. The high-temperature heat-insulating composite material comprises a combined layer structure. The combined layer structure comprises a first glass fiber reinforcing layer, a second glue bonding layer, a third mica layer, a fourth heat-insulating glue bonding layer, a fifth mica layer, a sixth glue bonding layer and a seventh glass fiber reinforcing layer which are sequentially stacked. The high-temperature heat-insulating composite material has the characteristics of thin thickness, good heat-insulating effect, high tensile strength, good electrical insulation and good flexibility.

Description

Technical Field

[0001] This invention belongs to the field of composite material technology, specifically relating to a high-temperature thermal insulation composite material, its preparation method, and its application. Background Technology

[0002] Thermal insulation materials between individual battery cells in new energy vehicles serve as a type of thermal protection material that can effectively delay or block the propagation of thermal runaway from a single cell to the entire battery system. Currently, commonly used thermal insulation materials include foam plastics, glass wool, high-silica cotton, aerogel, mica sheets, or mica rolls. The chemical stability and aging performance of foam plastics are greatly affected by the material and environment, and they cannot withstand temperatures above 800℃ during battery thermal runaway. Super cotton, glass wool, high-silica cotton, and aerogel materials are prone to dust generation if not encapsulated, so plastic films are often used for encapsulation. These encapsulation materials are not heat-resistant, and their electrical insulation performance is significantly reduced at high temperatures. While mica rolls and mica sheets have good electrical insulation and thermal stability, their tensile strength is low, and they are prone to delamination. Therefore, the thermal insulation effect of mica rolls or mica sheets is lower than that of high-silica cotton or aerogel of the same thickness.

[0003] CN114361740A discloses a low thermal conductivity mica composite for thermal runaway protection between battery cells and its preparation method. The low thermal conductivity mica composite includes a porous insulating material layer as the core layer and composite mica sheets laminated on the upper and lower surfaces of the porous insulating material layer; the surface of the composite mica sheets is hot-pressed with a reinforcing mesh fabric. The low thermal conductivity mica composite for thermal runaway protection provided by this technical solution has good thermal insulation and flame retardant properties, but the porous insulating material layer is 8-12mm thick ceramic cotton or foam ceramic, resulting in a large thickness, poor flexibility, and poor mechanical properties of the low thermal conductivity mica composite for thermal runaway protection.

[0004] CN218182394U discloses a battery module, battery pack, and automobile with a fireproof and heat-insulating structure. The battery module includes a battery cell, a first heat-insulating pad, and a second heat-insulating pad. The first heat-insulating pad sequentially includes a first fiberglass cloth layer, a first mica board layer, a first heat-insulating cotton layer, a second heat-insulating cotton layer, a second mica board layer, and a second fiberglass cloth layer. This technical solution uses a relatively thick first and second heat-insulating cotton layer (6.4 mm) to achieve heat insulation, but this thickness results in poor flexibility.

[0005] CN215662262U discloses a high-temperature resistant and flame-impact resistant heat insulation device, comprising a central heat insulation layer and mica isolation layers disposed on the upper and lower surfaces of the heat insulation layer. The mica isolation layers are mica layers composited with a fiberglass mesh substrate, including a mica layer and a fiberglass mesh layer on the surface of the mica layer. The heat insulation layer is an aerogel heat insulation layer, comprising a fibrous cotton felt and aerogel particles dispersed within the cotton felt. While the heat insulation device is resistant to high temperatures and flame impact, the aerogel heat insulation layer, consisting of cotton felt and aerogel particles, is prone to powdering and delamination, and has poor adhesion to the mica isolation layer.

[0006] Therefore, there is a need to develop a high-temperature thermal insulation composite material that is thin, has good thermal insulation effect, high mechanical strength, good electrical insulation and flexibility. Summary of the Invention

[0007] To address the shortcomings of existing technologies, the present invention aims to provide a high-temperature thermal insulation composite material, its preparation method, and its application. The high-temperature thermal insulation composite material has the characteristics of thin thickness, good thermal insulation effect, high tensile strength, good electrical insulation, and good flexibility.

[0008] To achieve this objective, the present invention adopts the following technical solution:

[0009] In a first aspect, the present invention provides a high-temperature thermal insulation composite material, the high-temperature thermal insulation composite material comprising a composite layer structure.

[0010] The composite layer structure includes a first fiberglass reinforcement layer, a second adhesive layer, a third mica layer, a fourth heat-insulating adhesive layer, a fifth mica layer, a sixth adhesive layer, and a seventh fiberglass reinforcement layer, which are stacked sequentially.

[0011] Preferably, the high-temperature thermal insulation composite material has a combined layer structure of one or at least two layers stacked sequentially.

[0012] Preferably, the thickness of the high-temperature thermal insulation composite material is 0.3-10mm, such as 0.3mm, 0.5mm, 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 8mm, 9mm or 10mm.

[0013] Preferably, the thickness of the first glass fiber reinforcement layer and the seventh glass fiber reinforcement layer are each independently 0.04-0.06 mm, such as 0.04 mm, 0.042 mm, 0.045 mm, 0.048 mm, 0.050 mm, 0.052 mm, 0.054 mm, 0.058 mm or 0.060 mm.

[0014] Preferably, the first and seventh fiberglass reinforcement layers are fiberglass cloth.

[0015] In this invention, the fiberglass cloth has high tensile strength and is used as the first and seventh fiberglass reinforcing layers. It is bonded to the third and fifth mica layers through the second and sixth adhesive layers, respectively, thereby improving the tensile strength of the high-temperature thermal insulation composite material.

[0016] Preferably, the thickness of the second adhesive layer and the sixth adhesive layer is independently 0.03-0.30 mm, for example 0.03 mm, 0.05 mm, 0.08 mm, 0.10 mm, 0.12 mm, 0.15 mm, 0.18 mm, 0.20 mm, 0.25 mm, 0.28 mm or 0.30 mm.

[0017] Preferably, the raw materials for preparing the second adhesive layer and the sixth adhesive layer include silicone pressure-sensitive adhesive.

[0018] Preferably, the thickness of the third mica layer and the fifth mica layer is independently 0.05-1.0 mm, for example 0.05 mm, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm or 1.0 mm.

[0019] Preferably, the raw materials for preparing the third and fifth mica layers include mica paper.

[0020] In this invention, mica is a natural insulating material with good thermal stability and a low thermal conductivity of less than 0.35 W / m². -1 K -1 Mica has a short-term temperature resistance of up to 1200℃ and exhibits good electrical insulation properties at both room temperature and high temperatures. Using mica paper as the third and fifth mica layers gives the high-temperature insulation composite material good temperature resistance, thermal insulation, electrical insulation properties, and thermal stability. However, mica paper has low tensile strength. This problem was solved by compounding mica paper with fiberglass cloth.

[0021] Preferably, the thickness of the fourth heat-insulating adhesive layer is 0.06-0.50 mm, such as 0.06 mm, 0.08 mm, 0.10 mm, 0.2 mm, 0.25 mm, 0.3 mm, 0.4 mm or 0.5 mm.

[0022] Preferably, the raw material for preparing the fourth heat-insulating adhesive layer is a heat-insulating adhesive, which includes silicone pressure-sensitive adhesive and heat-insulating particles.

[0023] Preferably, the mass of the heat insulation particles is 1-5% of the total mass of the raw materials used to prepare the fourth heat insulation adhesive layer.

[0024] In this invention, the mass of the heat insulation particles is 1-5% of the total mass of the raw materials used to prepare the fourth heat insulation adhesive layer. If it is greater than 5%, the adhesion of the fourth heat insulation adhesive layer will decrease and delamination will easily occur; if it is less than 1%, the heat insulation effect will decrease.

[0025] Preferably, the heat-insulating particles include aerogel particles and / or hollow microspheres.

[0026] Preferably, the aerogel particles comprise silica aerogel particles.

[0027] Preferably, the hollow microspheres include hollow glass microspheres.

[0028] Preferably, the heat-insulating particles include aerogel particles and hollow microspheres.

[0029] In this invention, if the heat-insulating particles include aerogel particles and hollow microspheres, the aerogel particles and hollow microspheres have a synergistic effect, which can maintain the fourth heat-insulating adhesive layer with good adhesion, and at the same time further improve the heat insulation effect of the high-temperature heat-insulating composite material.

[0030] Preferably, the mesh size of the heat-insulating particles is 800-1250 mesh, such as 800 mesh, 850 mesh, 900 mesh, 950 mesh, 1000 mesh, 1100 mesh, 1150 mesh or 1250 mesh.

[0031] In this invention, if the mesh size of the aerogel particles and / or hollow microspheres is less than 800 mesh or greater than 1250 mesh, the dispersion uniformity of the aerogel particles and / or hollow microspheres in the organosilicon pressure-sensitive adhesive decreases.

[0032] Preferably, the heat insulation adhesive is prepared by the following method: mixing silicone pressure-sensitive adhesive and heat insulation particles at 400-600 r / min (e.g., 400 r / min, 420 r / min, 450 r / min, 480 r / min, 500 r / min, 520 r / min, 550 r / min or 600 r / min, etc.) and stirring for 20-40 min (e.g., 20 min, 22 min, 25 min, 27 min, 30 min, 32 min, 35 min, 38 min or 40 min, etc.) to obtain the heat insulation adhesive.

[0033] Preferably, the silicone pressure-sensitive adhesive includes silicone pressure-sensitive adhesive JSA202 and / or silicone pressure-sensitive adhesive SH9169.

[0034] In a second aspect, the present invention provides a method for preparing a high-temperature heat-insulating composite material as described in the first aspect. The preparation method includes the following steps: sequentially stacking a first glass fiber reinforcing layer, a second adhesive layer, a third mica layer, a fourth heat-insulating adhesive layer, a fifth mica layer, a sixth adhesive layer, and a seventh glass fiber reinforcing layer, followed by rolling and heating to obtain a high-temperature heat-insulating composite material.

[0035] Preferably, the preparation method of sequentially stacked components includes the following steps:

[0036] (1) Coating the surface of the fiberglass cloth with silicone pressure-sensitive adhesive and bonding it with mica paper to form a three-layer structure consisting of a first fiberglass reinforcing layer, a second adhesive layer, and a third mica layer stacked in sequence.

[0037] (2) Apply heat-insulating adhesive to one side of the three-layer mica layer obtained in step (1), and heat it at 85-95℃ (e.g., 85℃, 86℃, 87℃, 88℃, 89℃, 90℃, 91℃, 92℃, 93℃, 94℃ or 95℃, etc.) for 20 minutes to obtain the fourth heat-insulating adhesive layer. Then bond it to one side of the three-layer mica layer obtained in another step (1) to obtain the first glass fiber reinforcement layer, the second adhesive layer, the third mica layer, the fourth heat-insulating adhesive layer, the fifth mica layer, the sixth adhesive layer and the seventh glass fiber reinforcement layer stacked in sequence.

[0038] Preferably, the heating is performed in a drying tunnel at 120-130℃ (e.g., 120℃, 121℃, 122℃, 123℃, 124℃, 125℃, 126℃, 127℃, 128℃, 129℃, or 130℃, etc.) for 15-25 minutes, such as 15 minutes, 16 minutes, 17 minutes, 18 minutes, 19 minutes, 20 minutes, 21 minutes, 22 minutes, 23 minutes, or 25 minutes, etc.

[0039] Thirdly, the present invention provides an application of the high-temperature thermal insulation composite material as described in the first aspect in the thermal insulation material between individual battery cells in new energy vehicles.

[0040] Compared with the prior art, the present invention has the following beneficial effects:

[0041] This invention creates a high-temperature thermal insulation composite material by sequentially layering a first fiberglass reinforcement layer, a second adhesive layer, a third mica layer, a fourth thermal insulation adhesive layer, a fifth mica layer, a sixth adhesive layer, and a seventh fiberglass reinforcement layer. The fourth thermal insulation adhesive layer is made using silicone pressure-sensitive adhesive and thermal insulation particles. This high-temperature thermal insulation composite material is characterized by its thinness, good thermal insulation effect, high tensile strength, good electrical insulation, and good flexibility. It has a simple structure, is easy to use, and has low production costs. It solves the problems of low heat resistance, the need for encapsulation, low tensile strength, and easy delamination of traditional thermal insulation materials, while also improving the thermal insulation effect. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of the high-temperature thermal insulation composite material provided in Example 1;

[0043] Figure 2 This is a schematic diagram of the high-temperature thermal insulation composite material provided in Example 2;

[0044] Among them, 1-first fiberglass reinforcement layer; 2-second adhesive bonding layer; 3-third mica layer; 4-fourth heat insulation adhesive bonding layer; 5-fifth mica layer; 6-sixth adhesive bonding layer; 7-seventh fiberglass reinforcement layer; 8-combination layer structure. Detailed Implementation

[0045] The technical solution of the present invention will be further illustrated below through specific embodiments. Those skilled in the art should understand that the embodiments described are merely illustrative of the present invention and should not be construed as limiting the invention in any way.

[0046] Example 1

[0047] This embodiment provides a high-temperature thermal insulation composite material and its preparation method. The thickness of the high-temperature thermal insulation composite material is 0.6 mm. Figure 1 As shown, the following combined layer structure is arranged in a sequentially stacked manner:

[0048] The first fiberglass reinforcement layer is fiberglass cloth with a thickness of 0.04 mm;

[0049] The second adhesive layer is made of silicone pressure-sensitive adhesive with a thickness of 0.03 mm.

[0050] The third mica layer is mica paper with a thickness of 0.18 mm;

[0051] The fourth heat-insulating adhesive layer is prepared from 97 wt% silicone pressure-sensitive adhesive and 3 wt% heat-insulating particles (the heat-insulating particles are 1000-mesh silica aerogel particles and 1000-mesh hollow glass microspheres with a mass ratio of 3:7), and has a thickness of 0.1 mm.

[0052] The fifth mica layer is mica paper with a thickness of 0.18 mm;

[0053] The sixth adhesive layer is made of silicone pressure-sensitive adhesive and has a thickness of 0.03 mm.

[0054] The seventh fiberglass reinforcement layer is fiberglass cloth with a thickness of 0.04mm;

[0055] The aforementioned silicone pressure-sensitive adhesive is silicone pressure-sensitive adhesive JSA202.

[0056] The preparation method is as follows:

[0057] (1) Mix 97wt% silicone pressure-sensitive adhesive and 3wt% heat insulation particles (the heat insulation particles are 1000 mesh silica aerogel particles and 1000 mesh hollow glass microspheres with a mass ratio of 3:7) at 500r / min for 30min to obtain heat insulation adhesive.

[0058] (2) Coating the surface of the fiberglass cloth with silicone pressure-sensitive adhesive and bonding it with mica paper to form a three-layer structure consisting of a first fiberglass reinforcing layer, a second adhesive layer, and a third mica layer stacked in sequence.

[0059] (3) Coat one side of the mica layer of the three-layer structure obtained in step (2) with the heat insulation adhesive obtained in step (1), heat it at 90°C for 20 minutes, and bond it to one side of the mica layer of the three-layer structure obtained in another step (1) to obtain a combined layer structure of the first glass fiber reinforcing layer, the second adhesive layer, the third mica layer, the fourth heat insulation adhesive layer, the fifth mica layer, the sixth adhesive layer and the seventh glass fiber reinforcing layer stacked in sequence. After rolling and heating in the oven at 125°C for 20 minutes, the high-temperature heat insulation composite material is obtained.

[0060] Example 2

[0061] This embodiment provides a high-temperature thermal insulation composite material and its preparation method. The thickness of the high-temperature thermal insulation composite material is 1 mm. Figure 2 As shown, it includes two combined layer structures arranged in sequence as follows:

[0062] The first fiberglass reinforcement layer is fiberglass cloth with a thickness of 0.04 mm;

[0063] The second adhesive layer is made of silicone pressure-sensitive adhesive with a thickness of 0.03 mm.

[0064] The third mica layer is mica paper with a thickness of 0.15mm;

[0065] The fourth heat-insulating adhesive layer is prepared from 95 wt% silicone pressure-sensitive adhesive and 5 wt% heat-insulating particles (1250 mesh silica aerogel particles), with a thickness of 0.06 mm.

[0066] The fifth mica layer is mica paper with a thickness of 0.15 mm;

[0067] The sixth adhesive layer is made of silicone pressure-sensitive adhesive and has a thickness of 0.03 mm.

[0068] The seventh fiberglass reinforcement layer is fiberglass cloth with a thickness of 0.04mm;

[0069] The aforementioned silicone pressure-sensitive adhesive is silicone pressure-sensitive adhesive JSA202.

[0070] The preparation method is as follows:

[0071] (1) Mix 95wt% silicone pressure-sensitive adhesive and 5wt% heat insulation particles (1250 mesh silica aerogel particles) at 400r / min for 40min to obtain heat insulation adhesive.

[0072] (2) Coating the surface of the fiberglass cloth with silicone pressure-sensitive adhesive and bonding it with mica paper to form a three-layer structure consisting of a first fiberglass reinforcing layer, a second adhesive layer, and a third mica layer stacked in sequence.

[0073] (3) Coat one side of the three-layer mica layer obtained in step (2) with the heat-insulating adhesive obtained in step (1), heat at 95°C for 20 minutes, and bond it to one side of the three-layer mica layer obtained in another step (1) to obtain a combined layer structure consisting of a first fiberglass reinforcement layer, a second adhesive layer, a third mica layer, a fourth heat-insulating adhesive layer, a fifth mica layer, a sixth adhesive layer and a seventh fiberglass reinforcement layer stacked in sequence.

[0074] (4) The combined layer structure prepared in step (3) is stacked, rolled, and heated in a drying tunnel at 130°C for 15 minutes to obtain the high-temperature heat insulation composite material.

[0075] Example 3

[0076] This embodiment provides a high-temperature thermal insulation composite material and its preparation method. The high-temperature thermal insulation composite material has a thickness of 1.5 mm and includes three sequentially stacked composite layers as follows:

[0077] The first fiberglass reinforcement layer is fiberglass cloth with a thickness of 0.04 mm;

[0078] The second adhesive layer is made of silicone pressure-sensitive adhesive with a thickness of 0.03 mm.

[0079] The third mica layer is mica paper with a thickness of 0.15mm;

[0080] The fourth heat-insulating adhesive layer is prepared from 99 wt% silicone pressure-sensitive adhesive and 1 wt% heat-insulating particles (800 mesh hollow glass microspheres), with a thickness of 0.06 mm.

[0081] The fifth mica layer is mica paper with a thickness of 0.15 mm;

[0082] The sixth adhesive layer is made of silicone pressure-sensitive adhesive and has a thickness of 0.03 mm.

[0083] The seventh fiberglass reinforcement layer is fiberglass cloth with a thickness of 0.04mm;

[0084] The aforementioned silicone pressure-sensitive adhesive is silicone pressure-sensitive adhesive SH9169.

[0085] The preparation method is as follows:

[0086] (1) Mix 99wt% silicone pressure-sensitive adhesive and 1wt% heat insulation particles (800 mesh hollow glass microspheres) at 600r / min for 20min to obtain heat insulation adhesive.

[0087] (2) Coating the surface of the fiberglass cloth with silicone pressure-sensitive adhesive and bonding it with mica paper to form a three-layer structure consisting of a first fiberglass reinforcing layer, a second adhesive layer, and a third mica layer stacked in sequence.

[0088] (3) Coat one side of the three-layer mica layer obtained in step (2) with the heat-insulating adhesive obtained in step (1), heat at 95°C for 20 minutes, and bond it to one side of the three-layer mica layer obtained in another step (1) to obtain a combined layer structure consisting of a first fiberglass reinforcement layer, a second adhesive layer, a third mica layer, a fourth heat-insulating adhesive layer, a fifth mica layer, a sixth adhesive layer and a seventh fiberglass reinforcement layer stacked in sequence.

[0089] (4) The combined layer structure prepared in the three steps (3) is stacked, rolled, and heated in a drying tunnel at 120°C for 25 minutes to obtain the high-temperature heat insulation composite material.

[0090] Example 4

[0091] This embodiment provides a high-temperature thermal insulation composite material and its preparation method. The difference between this embodiment and Embodiment 1 is that the high-temperature thermal insulation composite material has a thickness of 5.36 mm and comprises two sequentially stacked composite layers as follows:

[0092] The first fiberglass reinforcement layer is fiberglass cloth with a thickness of 0.06mm;

[0093] The second adhesive layer is made of silicone pressure-sensitive adhesive with a thickness of 0.03 mm.

[0094] The third mica layer is mica paper with a thickness of 1.0 mm;

[0095] The fourth heat-insulating adhesive layer is prepared from 97 wt% silicone pressure-sensitive adhesive and 3 wt% heat-insulating particles (the heat-insulating particles are 1000-mesh silica aerogel particles and 1000-mesh hollow glass microspheres with a mass ratio of 3:7), and has a thickness of 0.5 mm.

[0096] The fifth mica layer is mica paper with a thickness of 1.0 mm;

[0097] The sixth adhesive layer is made of silicone pressure-sensitive adhesive and has a thickness of 0.03 mm.

[0098] The seventh fiberglass reinforcement layer is fiberglass cloth with a thickness of 0.06mm;

[0099] The aforementioned silicone pressure-sensitive adhesive is silicone pressure-sensitive adhesive JSA202.

[0100] The preparation method further includes step (4): stacking the combined layer structure prepared in the two steps (3), rolling it, and heating it in a drying tunnel at 130°C for 15 minutes to obtain the high-temperature heat insulation composite material.

[0101] The other raw materials, dosages, and preparation methods are the same as in Example 1.

[0102] Example 5

[0103] This embodiment provides a high-temperature thermal insulation composite material and its preparation method. The difference between this embodiment and Embodiment 1 is that the high-temperature thermal insulation composite material has a thickness of 0.3 mm and comprises the following combined layer structure stacked sequentially:

[0104] The first fiberglass reinforcement layer is fiberglass cloth with a thickness of 0.04 mm;

[0105] The second adhesive layer is made of silicone pressure-sensitive adhesive with a thickness of 0.03 mm.

[0106] The third mica layer is mica paper with a thickness of 0.05 mm;

[0107] The fourth heat-insulating adhesive layer is prepared from 97 wt% silicone pressure-sensitive adhesive and 3 wt% heat-insulating particles (the heat-insulating particles are 1000-mesh silica aerogel particles and 1000-mesh hollow glass microspheres in a mass ratio of 3:7), and has a thickness of 0.06 mm.

[0108] The fifth mica layer is mica paper with a thickness of 0.05 mm;

[0109] The sixth adhesive layer is made of silicone pressure-sensitive adhesive and has a thickness of 0.03 mm.

[0110] The seventh fiberglass reinforcement layer is made of fiberglass cloth with a thickness of 0.04 mm.

[0111] The aforementioned silicone pressure-sensitive adhesive is silicone pressure-sensitive adhesive JSA202.

[0112] The other raw materials, dosages, and preparation methods are the same as in Example 1.

[0113] Example 6

[0114] This embodiment provides a high-temperature thermal insulation composite material and its preparation method. The difference between this embodiment and Embodiment 1 is that the thermal insulation particles are only 1000-mesh silica aerogel particles, while the other raw materials, dosages, and preparation methods are the same as in Embodiment 1.

[0115] Example 7

[0116] This embodiment provides a high-temperature thermal insulation composite material and its preparation method. The difference between this embodiment and Embodiment 1 is that the thermal insulation particles are only 1000-mesh hollow glass microspheres, while the other raw materials, dosages, and preparation methods are the same as in Embodiment 1.

[0117] Example 8

[0118] This embodiment provides a high-temperature thermal insulation composite material and its preparation method. The difference between this embodiment and Embodiment 1 is that the raw materials for preparing the fourth thermal insulation adhesive layer are 90wt% silicone pressure-sensitive adhesive and 10wt% thermal insulation particles (1000-mesh silica aerogel particles and 1000-mesh hollow glass microspheres with a mass ratio of 3:7). The silicone pressure-sensitive adhesive is silicone pressure-sensitive adhesive JSA202. In the preparation method, step (1) is to mix 75wt% silicone pressure-sensitive adhesive and 25wt% thermal insulation particles (1000-mesh silica aerogel particles and 1000-mesh hollow glass microspheres with a mass ratio of 3:7) at 500r / min for 30min to obtain thermal insulation adhesive. Other raw materials, dosages and preparation methods are the same as in Embodiment 1.

[0119] Example 9

[0120] This embodiment provides a high-temperature thermal insulation composite material and its preparation method. The difference between this embodiment and Embodiment 1 is that the raw materials for preparing the fourth thermal insulation adhesive layer are 99.5 wt% silicone pressure-sensitive adhesive and 0.5 wt% thermal insulation particles (1000-mesh silica aerogel particles and 1000-mesh hollow glass microspheres in a mass ratio of 3:7). The silicone pressure-sensitive adhesive is silicone pressure-sensitive adhesive JSA 202. In the preparation method, step (1) is to mix 99.5 wt% silicone pressure-sensitive adhesive and 0.5 wt% thermal insulation particles (1000-mesh silica aerogel particles and 1000-mesh hollow glass microspheres in a mass ratio of 3:7) at 500 r / min for 30 min to obtain thermal insulation adhesive. Other raw materials, dosages and preparation methods are the same as in Embodiment 1.

[0121] Example 10

[0122] This embodiment provides a high-temperature thermal insulation composite material and its preparation method. The difference between this embodiment and Embodiment 1 is that the thermal insulation particles are only 600-mesh silica aerogel particles, while the other raw materials, dosages, and preparation methods are the same as in Embodiment 1.

[0123] Example 11

[0124] This embodiment provides a high-temperature thermal insulation composite material and its preparation method. The difference between this embodiment and Embodiment 1 is that the thermal insulation particles are only 2000-mesh silica aerogel particles, while the other raw materials, dosages, and preparation methods are the same as in Embodiment 1.

[0125] Comparative Example 1

[0126] This comparative example provides a high-temperature thermal insulation composite material and its preparation method. The difference between this example and Example 1 is that the raw material for preparing the fourth thermal insulation adhesive layer is organosilicon pressure-sensitive adhesive JSA202, while the other raw materials, dosages, and preparation methods are the same as in Example 1.

[0127] Comparative Example 2

[0128] This comparative example provides a high-temperature thermal insulation composite material and its preparation method. The high-temperature thermal insulation composite material has a thickness of 0.6 mm and includes the following combined layer structure stacked sequentially:

[0129] The mica layer is made of mica paper and has a thickness of 0.25 mm.

[0130] The raw materials for preparing the heat-insulating adhesive layer are 97wt% silicone pressure-sensitive adhesive JSA202 and 3wt% heat-insulating particles (the heat-insulating particles are 1000-mesh silica aerogel particles and 1000-mesh hollow glass microspheres with a mass ratio of 3:7), and the thickness is 0.1mm.

[0131] The mica layer is made of mica paper and is 0.25 mm thick.

[0132] The preparation method is as follows:

[0133] (1) 97 wt% of silicone pressure-sensitive adhesive and 3 wt% of heat-insulating particles (the heat-insulating particles are 1000 mesh silica aerogel particles and 1000 mesh hollow glass microspheres with a mass ratio of 3:7) are mixed at 500 r / min for 30 min to obtain heat-insulating adhesive.

[0134] (2) Coat one side of the mica layer with the heat insulation adhesive prepared in step (1), heat it at 90°C for 20 minutes, and bond it to the other side of the mica layer to obtain the mica layer, heat insulation adhesive layer and mica layer stacked in sequence. After rolling, heat it in the oven at 125°C for 20 minutes to obtain the high temperature heat insulation composite material.

[0135] Comparative Example 3

[0136] This comparative example provides a common mica roll with a thickness of 1 mm.

[0137] Comparative Example 4

[0138] This comparative example provides an aerogel felt with a thickness of 1 mm.

[0139] The following performance tests were conducted on the high-temperature thermal insulation composite materials provided in Examples 1-11 and Comparative Examples 1-2, the ordinary mica roll provided in Comparative Example 3, and the aerogel felt provided in Comparative Example 4.

[0140] (1) Thermal insulation performance: Placed on a flame at 1200℃ and burned at high temperature for 120 minutes, the temperature of the cold surface is measured.

[0141] (2) Tensile strength: Tensile strength test shall be conducted in accordance with GB / T 5019-2002.

[0142] The test results are shown in Table 1.

[0143] Table 1

[0144] Thickness (mm) Cold surface temperature (°C) Tensile strength (N / cm) Example 1 0.6 292 324 Example 2 1 274 357 Example 3 1.5 198 389 Example 4 5.4 85 942 Example 5 0.3 339 267 Example 6 0.6 345 282 Example 7 0.6 363 343 Example 8 0.6 290 194 Example 9 0.6 428 287 Example 10 0.6 401 183 Example 11 0.6 392 192 Comparative Example 1 0.6 442 332 Comparative Example 2 0.6 331 106 Comparative Example 3 1 453 235 Comparative Example 4 1 286 198

[0145] According to the test results in Table 1, the high-temperature thermal insulation composite material of the present invention has the characteristics of thin thickness, good thermal insulation effect, high tensile strength and good flexibility. The high-temperature thermal insulation composite materials provided in Examples 1 to 11 were placed in a flame at 1200°C and burned for 120 minutes. The cold surface temperature was 85-428°C, and the tensile strength was 183-942 N / cm.

[0146] Compared with Example 1, if the heat insulation particles are only hollow microspheres (Example 6) or only aerogel particles (Example 7), the cold surface temperature rises and the heat insulation effect decreases, proving that the heat insulation effect of the high-temperature heat insulation composite material prepared by using a combination of aerogel particles and hollow microspheres as heat insulation particles is better.

[0147] Compared with Example 1, if the mass percentage of heat insulation particles is too high (Example 8), the tensile strength decreases significantly; if the mass percentage of heat insulation particles is too low (Example 9), the cold surface temperature rises and the heat insulation effect decreases, proving that adding a specific mass percentage of heat insulation particles results in a better heat insulation effect for the high-temperature heat insulation composite material.

[0148] Compared with Example 6, if the mesh size of the heat insulation particles is too small (Example 10) or too large (Example 11), the cold surface temperature rises, the heat insulation effect decreases, and the tensile strength decreases, proving that adding heat insulation particles with a specific mesh size results in a better heat insulation effect for the high-temperature heat insulation composite material.

[0149] Compared with Example 1, if no heat-insulating particles are added and the raw material for preparing the fourth heat-insulating adhesive layer is only silicone pressure-sensitive adhesive JSA202 (Comparative Example 1), the cold surface temperature will rise and the heat insulation effect will be worse.

[0150] Compared with Example 1, if the composite layer structure of the high-temperature thermal insulation composite material is a mica layer, a thermal insulation adhesive layer and a mica layer stacked in sequence (Comparative Example 2), the tensile strength becomes lower.

[0151] Compared with the high-temperature thermal insulation composite material provided in Example 2, the ordinary mica roll provided in Comparative Example 3 has better thermal insulation effect and higher tensile strength under the same thickness.

[0152] Compared with the high-temperature thermal insulation composite material provided in Example 2, the aerogel felt provided in Comparative Example 4 has similar thermal insulation effects under the same thickness, while the high-temperature thermal insulation composite material provided in Example 2 has higher tensile strength.

[0153] The applicant declares that the present invention is illustrated by the above embodiments, but the present invention is not limited to the above process steps, that is, it does not mean that the present invention must rely on the above process steps to be implemented. Those skilled in the art should understand that any improvements to the present invention, equivalent substitutions of the raw materials used in the present invention, addition of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

Claims

1. A high-temperature thermal insulation composite material, characterized in that, The high-temperature thermal insulation composite material includes a composite layer structure; The composite layer structure includes a first fiberglass reinforcement layer, a second adhesive layer, a third mica layer, a fourth heat-insulating adhesive layer, a fifth mica layer, a sixth adhesive layer, and a seventh fiberglass reinforcement layer stacked sequentially. The raw material for preparing the second and sixth adhesive layers is silicone pressure-sensitive adhesive; The raw material for preparing the fourth heat-insulating adhesive layer is heat-insulating adhesive, which includes silicone pressure-sensitive adhesive and heat-insulating particles. The heat-insulating particles are aerogel particles and hollow microspheres; The mass of the heat insulation particles is 1-5% of the total mass of the raw materials used to prepare the fourth heat insulation adhesive layer; The mesh size of the heat-insulating particles is 800-1250 mesh.

2. The high-temperature thermal insulation composite material according to claim 1, characterized in that, The high-temperature thermal insulation composite material has a combined layer structure of one or at least two layers stacked sequentially.

3. The high-temperature thermal insulation composite material according to claim 1, characterized in that, The thickness of the high-temperature thermal insulation composite material is 0.3-10 mm.

4. The high-temperature thermal insulation composite material according to claim 1, characterized in that, The thickness of the first fiberglass reinforcement layer and the seventh fiberglass reinforcement layer are each independently 0.04-0.06 mm.

5. The high-temperature thermal insulation composite material according to claim 1, characterized in that, The first and seventh fiberglass reinforcement layers are fiberglass cloth.

6. The high-temperature thermal insulation composite material according to claim 1, characterized in that, The thickness of the second adhesive layer and the sixth adhesive layer are each independently 0.03-0.30 mm.

7. The high-temperature thermal insulation composite material according to claim 1, characterized in that, The thickness of the third and fifth mica layers is independently 0.05-1.0 mm.

8. The high-temperature thermal insulation composite material according to claim 1, characterized in that, The raw materials for preparing the third and fifth mica layers include mica paper.

9. The high-temperature thermal insulation composite material according to claim 1, characterized in that, The thickness of the fourth heat-insulating adhesive layer is 0.06-0.50 mm.

10. The high-temperature thermal insulation composite material according to claim 1, characterized in that, The aerogel particles include silica aerogel particles.

11. The high-temperature thermal insulation composite material according to claim 1, characterized in that, The hollow microspheres include hollow glass microspheres.

12. The high-temperature thermal insulation composite material according to claim 1, characterized in that, The heat insulation adhesive is prepared by the following method: mixing silicone pressure-sensitive adhesive and heat insulation particles at 400-600 r / min for 20-40 min to obtain the heat insulation adhesive.

13. The high-temperature thermal insulation composite material according to claim 1, characterized in that, The silicone pressure-sensitive adhesive includes silicone pressure-sensitive adhesive JSA202 and / or silicone pressure-sensitive adhesive SH9169.

14. A method for preparing a high-temperature thermal insulation composite material according to any one of claims 1-13, characterized in that, The preparation method includes the following steps: stacking a first fiberglass reinforcing layer, a second adhesive layer, a third mica layer, a fourth heat-insulating adhesive layer, a fifth mica layer, a sixth adhesive layer, and a seventh fiberglass reinforcing layer in sequence, and then rolling and heating them to obtain a high-temperature heat-insulating composite material.

15. The preparation method according to claim 14, characterized in that, The preparation method of sequentially stacked configurations includes the following steps: (1) Coating the surface of the fiberglass cloth with silicone pressure-sensitive adhesive and bonding it with mica paper to form a three-layer structure consisting of a first fiberglass reinforcing layer, a second adhesive layer, and a third mica layer stacked in sequence. (2) Apply heat-insulating adhesive to one side of the three-layer mica layer obtained in step (1), heat at 85-95℃ for 20 min to obtain the fourth heat-insulating adhesive layer, and then bond it to one side of the three-layer mica layer obtained in another step (1) to obtain the first glass fiber reinforcement layer, the second adhesive layer, the third mica layer, the fourth heat-insulating adhesive layer, the fifth mica layer, the sixth adhesive layer and the seventh glass fiber reinforcement layer stacked in sequence.

16. The preparation method according to claim 14, characterized in that, The heating is performed by passing through a drying tunnel at 120-130°C for 15-25 minutes.

17. The application of the high-temperature thermal insulation composite material according to any one of claims 1-13 in the thermal insulation material between individual battery cells of new energy vehicles.

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