Composite material low-thermal-conductivity warm-edge spacer bar and preparation process thereof

Abstract

The application discloses a composite material low-thermal-conductivity warm-edge spacer and a preparation process thereof, and relates to the technical field of hollow glass materials. The composite material low-thermal-conductivity warm-edge spacer and the preparation process thereof comprise a spacer main body, the spacer main body is an integrated four-layer heterogeneous composite structure, and sequentially comprises an inner support framework layer, a low-thermal-conductivity barrier core layer, a gas-phase barrier coating layer and a sealing adhesive layer from inside to outside. The inner support framework layer is a continuous basalt fiber reinforced polyether ether ketone composite material, and at least two independent closed partition cavities are arranged in the inner support framework layer. The core pain points of the prior art are completely solved, the overall thermal conductivity of the product is less than or equal to 0.15 W / (m*K), which is far lower than the thermal conductivity requirement of the warm-edge spacer in the national standard, meanwhile, the tensile strength is greater than or equal to 80 MPa, and the heat distortion temperature is greater than or equal to 180 DEG C, so that the long-term support demand of the large-size hollow glass can be met, the interlayer separation and cracking do not occur after 1000 times of high-low temperature cycles, the water vapor permeability is less than or equal to 0.1 g / (m 2 *24h), and the service life of the hollow glass is greatly prolonged.

Description

Technical Field

[0001] This invention relates to the field of insulating glass materials technology, and in particular to a composite material low thermal conductivity warm edge spacer and its preparation process. Background Technology

[0002] With the deepening of the dual carbon target, ultra-low energy buildings have put forward higher requirements for the thermal insulation performance of insulated glass. As the core component of edge thermal insulation of insulated glass, the performance of the warm edge spacer directly determines the overall energy-saving effect and service life of insulated glass. Existing warm edge spacers for insulated glass cannot simultaneously achieve a synergistic balance of ultra-low thermal conductivity, high structural support strength, and long-term weather-resistant sealing stability, resulting in a mismatch between the thermal insulation life and structural safety of insulated glass for ultra-low energy consumption buildings. Specifically, although existing metal composite warm edge spacers have high structural strength, the metal material has continuous thermal bridges, and the thermal conductivity is difficult to reduce to below 0.2W / (m・K), which cannot meet the extreme thermal insulation requirements of ultra-low energy consumption buildings. Although all-organic non-metallic warm edge spacers have low thermal conductivity, their structural strength is insufficient. They are prone to deformation and bending after long-term use and cannot meet the support requirements of large-size insulated glass. Meanwhile, existing composite warm edge spacers generally have the problem of large differences in the coefficient of thermal expansion between layers. Under long-term hot and cold cycling conditions, they are prone to interlayer separation and interface cracking, which leads to water vapor penetration into the insulating glass cavity, causing thermal insulation performance failure, glass fogging and condensation, and a significantly shortened service life. They cannot meet the requirements for long-term weather resistance of warm edge spacers in the GB / T29755-2023 standard. Summary of the Invention

[0003] The purpose of this invention is to at least solve one of the technical problems existing in the prior art, and to provide a composite material low thermal conductivity warm edge spacer and its preparation process, which can solve the above-mentioned background technical problems.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a composite material low thermal conductivity warm edge spacer, comprising a spacer body, the spacer body being an integrally formed four-layer heterogeneous composite structure, comprising, from the inside out, an inner support skeleton layer, a low thermal conductivity barrier core layer, a vapor phase barrier coating, and a sealing adhesive layer. The inner support skeleton layer is made of continuous basalt fiber reinforced polyetheretherketone composite material, and has at least two independent closed partition cavities. The low thermal conductivity barrier core layer is made of fumed silica aerogel modified polytetrafluoroethylene propylene composite material. The vapor barrier coating is a nano-alumina modified polyvinylidene chloride composite coating; The sealing adhesive layer is made of butyl rubber modified polyisobutylene hot melt adhesive.

[0005] Preferably, in the inner support skeleton layer, the mass percentage of continuous basalt fiber is 20%~35%, the mass percentage of polyetheretherketone resin is 63%~78%, and the remainder is silane coupling agent. The monofilament diameter of the continuous basalt fiber is 9~13μm and the length is 5~8mm.

[0006] Preferably, in the low thermal conductivity barrier core layer, the mass percentage of fumed silica aerogel is 8%~18%, the mass percentage of polytetrafluoroethylene propylene resin is 80%~91%, and the remainder is a dispersant. The particle size of the fumed silica aerogel is 20~50nm, and the thermal conductivity is ≤0.02W / (m・K).

[0007] Preferably, the dry film thickness of the vapor barrier coating is 8~15μm, wherein the mass percentage of nano-alumina is 5%~12%, the mass percentage of polyvinylidene chloride resin is 85%~94%, and the remainder is film-forming aids.

[0008] Preferably, the adjacent cavities of the enclosed partition are separated by supporting ribs with a wall thickness of 0.3~0.8mm, and the cross-sectional area of ​​a single cavity is 2~5mm². 2 .

[0009] Preferably, the thickness of the sealing adhesive layer is 0.2~0.5mm, its Shore hardness is 35~45HA, and its air permeability is ≤0.05g / m³. 2 The outer surface of the sealing adhesive layer is provided with a continuous sawtooth microstructure, and the tooth height of the microstructure is 0.05~0.1mm.

[0010] A manufacturing process for a composite material low thermal conductivity warm edge spacer, characterized by the following steps: S1. Raw material pretreatment: The raw materials of the inner support skeleton layer and the low thermal conductivity barrier core layer are dried respectively, mixed according to the ratio, and granulated by twin screw extruder to obtain the corresponding composite masterbatch. S2, Multi-layer co-extrusion molding: Two composite masterbatches are added to a twin-screw co-extrusion equipment and extruded in one piece through a layered co-extrusion die to obtain a double-layer composite substrate with a multi-cavity structure. During the extrusion process, inert gas is introduced into the inner cavity of the die to maintain positive pressure inside the cavity. S3. Surface modification and coating: The outer surface of the extruded double-layer composite substrate is subjected to low-temperature plasma treatment, followed by online coating of a vapor barrier coating, and the coating is cured through an infrared drying tunnel. S4. Sealing layer coating and shaping: A sealing adhesive layer is applied online to the outer surface of the cured substrate, and then the size is shaped by a vacuum shaping table. After cooling, traction and cutting, the low thermal conductivity warm edge spacer of the composite material is obtained.

[0011] Preferably, in step S2, the extrusion temperature range of the inner support skeleton layer is 360~390℃, the extrusion temperature range of the low thermal conductivity barrier core layer is 320~350℃, the temperature of the layered co-extrusion die is 350~370℃, and the inert gas pressure is 0.02~0.05MPa.

[0012] Preferably, in step S3, the power of the low-temperature plasma treatment is 800~1200W, and the treatment time is 3~8s; The infrared drying tunnel is divided into three temperature control sections, with temperatures of 60℃, 90℃, and 120℃ respectively, and the total curing time of the coating is 15~25s.

[0013] Preferably, in step S4, the vacuum degree of the vacuum shaping stage is -0.06 to -0.08 MPa, the shaping temperature is 20 to 30°C, the cooling adopts a gradient water cooling method, the cooling water temperature is 40°C, 25°C, and 15°C respectively, and the traction speed is 2 to 5 m / min.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention relates to a low thermal conductivity warm-edge spacer made of composite material and its manufacturing process. Through the synergistic design of a four-layer heterogeneous composite structure, it achieves a unified balance of three core properties: ultra-low thermal conductivity, high strength, and long-lasting weather resistance. This completely solves the core pain points of existing technologies. The overall thermal conductivity of the product is ≤0.15W / (m・K), far below the thermal conductivity requirements for warm-edge spacers in national standards. Simultaneously, its tensile strength is ≥80MPa, and its heat distortion temperature is ≥180℃, meeting the long-term support requirements of large-size insulated glass. It withstands 1000 high and low temperature cycles without delamination or cracking, and its water vapor transmission rate is ≤0.1g / (m·K). 2 • 24h), which greatly extends the service life of insulated glass.

[0015] 2. The composite material low thermal conductivity warm edge spacer and its preparation process: The material system of this invention has outstanding creativity. It uses continuous basalt fiber reinforced polyetheretherketone as the inner support skeleton layer. Compared with traditional glass fiber reinforced polypropylene and nylon materials, it has higher strength, lower thermal conductivity, and better weather resistance and creep resistance. At the same time, its coefficient of thermal expansion is closer to that of glass, which greatly reduces the interfacial stress under thermal cycling. It uses aerogel modified polytetrafluoroethylene propylene as the low thermal conductivity barrier core layer. While maintaining extremely low thermal conductivity, it has excellent chemical corrosion resistance and water vapor barrier performance, good compatibility with the skeleton layer, and strong interlayer adhesion.

[0016] 3. This invention relates to a low thermal conductivity warm-edge spacer made of composite material and its preparation process. Through the combination of a multi-cavity partition structure and a vapor-phase barrier coating, the thermal insulation and sealing performance are further enhanced. The multi-cavity structure blocks convective heat transfer channels, further reducing the product's thermal conductivity. The nano-alumina-modified polyvinylidene chloride vapor-phase barrier coating significantly improves the product's water vapor and gas barrier performance. Simultaneously, low-temperature plasma pretreatment solves the problem of insufficient adhesion between the organic substrate and the coating, avoiding the risk of coating peeling during long-term use.

[0017] 4. The low thermal conductivity warm edge spacer of the composite material and its preparation process: The invention adopts an integrated multi-layer co-extrusion, online modification coating and vacuum shaping continuous production method. Compared with the traditional step-by-step composite process, the production efficiency is increased by more than 40%, the product has high dimensional accuracy, strong interlayer bonding force, good batch stability, no complicated post-processing process, easy to industrialize and mass-produce, and has extremely high economic value and application prospects. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a schematic diagram of a composite material low thermal conductivity warm edge spacer according to the present invention; Figure 2 This is a schematic diagram of a composite material low thermal conductivity warm edge spacer according to the present invention; Figure 3 This is a planar schematic diagram of the internal support skeleton layer of the present invention.

[0019] Reference numerals: 1. Spacer bar body; 11. Sealing adhesive layer; 12. Vapor phase barrier coating; 13. Low thermal conductivity barrier core layer; 14. Inner support skeleton layer; 15. Partition cavity; 16. Support rib. Detailed Implementation

[0020] This section will describe in detail specific embodiments of the present invention. Preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.

[0021] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0022] In the description of this invention, terms such as greater than, less than, and exceeding are understood to exclude the stated number, while terms such as above, below, and within are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0023] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0024] Please see Figure 1-3 The present invention provides a technical solution: a composite material low thermal conductivity warm edge spacer, including a spacer body 1, the spacer body 1 is an integrally formed four-layer heterogeneous composite structure, which includes an inner support skeleton layer 14, a low thermal conductivity barrier core layer 13, a vapor phase barrier coating 12, and a sealing adhesive layer 11 from the inside to the outside. The inner support skeleton layer 14 is made of continuous basalt fiber reinforced polyether ether ketone composite material, and has at least two independent closed partition cavities 15 inside. The low thermal conductivity barrier core layer 13 is made of fumed silica aerogel modified polytetrafluoroethylene propylene composite material; The vapor barrier coating 12 is a nano-alumina modified polyvinylidene chloride composite coating; The sealing adhesive layer 11 is made of butyl rubber modified polyisobutylene hot melt adhesive; Furthermore, in the inner support skeleton layer 14, the mass percentage of continuous basalt fiber is 20%~35%, the mass percentage of polyetheretherketone resin is 63%~78%, and the remainder is silane coupling agent. The diameter of the single filament of the continuous basalt fiber is 9~13μm and the length is 5~8mm. Furthermore, in the low thermal conductivity barrier core layer 13, the mass percentage of fumed silica aerogel is 8%~18%, the mass percentage of polytetrafluoroethylene propylene resin is 80%~91%, and the remainder is a dispersant. The particle size of the fumed silica aerogel is 20~50nm, and the thermal conductivity is ≤0.02W / (m・K).

[0025] Furthermore, the dry film thickness of the vapor barrier coating 12 is 8~15μm, wherein the mass percentage of nano-alumina is 5%~12%, the mass percentage of polyvinylidene chloride resin is 85%~94%, and the remainder is film-forming aids. Furthermore, the inner support frame layer 14 contains 3 to 5 parallel closed partition cavities 15, with adjacent cavities separated by support ribs 16 with a wall thickness of 0.3 to 0.8 mm. The cross-sectional area of ​​a single cavity is 2 to 5 mm². 2 ; Furthermore, the thickness of the sealing adhesive layer 11 is 0.2~0.5mm, its Shore hardness is 35~45HA, and its air permeability is ≤0.05g / m². 2 The outer surface of the sealing adhesive layer 11 is provided with a continuous sawtooth microstructure, and the tooth height of the microstructure is 0.05~0.1mm; A manufacturing process for a composite material low thermal conductivity warm edge spacer includes the following steps: S1. Raw material pretreatment: The raw materials of the inner support skeleton layer 14 and the low thermal conductivity barrier core layer 13 are dried respectively, mixed according to the ratio, and granulated by twin-screw extruder to obtain the corresponding composite masterbatch. S2, Multi-layer co-extrusion molding: Two composite masterbatches are added to a twin-screw co-extrusion equipment and extruded in one piece through a layered co-extrusion die to obtain a double-layer composite substrate with a multi-cavity structure. During the extrusion process, inert gas is introduced into the inner cavity of the die to maintain positive pressure inside the cavity. S3. Surface modification and coating: The outer surface of the extruded double-layer composite substrate is subjected to low-temperature plasma treatment, followed by online coating of vapor barrier coating 12, and the coating is cured by infrared drying tunnel. S4. Sealing layer coating and shaping: A sealing adhesive layer 11 is coated online on the outer surface of the cured substrate. Then, the size is shaped by a vacuum shaping table. After cooling, traction and cutting, the low thermal conductivity warm edge spacer strip of the composite material is obtained. In step S2, the extrusion temperature range of the inner support skeleton layer 14 is 360~390℃, the extrusion temperature range of the low thermal conductivity barrier core layer is 320~350℃, the temperature of the layered co-extrusion die is 350~370℃, and the inert gas pressure is 0.02~0.05MPa. In step S3, the power of the low-temperature plasma treatment is 800~1200W, and the treatment time is 3~8s; the infrared drying tunnel is divided into three temperature control sections, with temperatures of 60℃, 90℃, and 120℃ respectively, and the total curing time of the coating is 15~25s.

[0026] In step S4, the vacuum degree of the vacuum stenting stage is -0.06~-0.08MPa, the stenting temperature is 20~30℃, the cooling adopts gradient water cooling method, the cooling water temperature is 40℃, 25℃ and 15℃ respectively, and the traction speed is 2~5m / min.

[0027] Example 1: A composite material low thermal conductivity warm edge spacer includes a spacer body 1, which is an integrally formed four-layer heterogeneous composite structure, including an inner support skeleton layer 14, a low thermal conductivity barrier core layer 13, a vapor phase barrier coating 12, and a sealing adhesive layer 11 from the inside to the outside. The inner support frame layer 14 contains three parallel closed partition cavities 15, and adjacent cavities are separated by support ribs 16. The raw material ratio of the inner support skeleton layer 14 is as follows: continuous basalt fiber accounts for 25% of the mass, polyetheretherketone resin accounts for 73% of the mass, and silane coupling agent KH550 accounts for 2% of the mass. The continuous basalt fiber has a single filament diameter of 10μm and a length of 6mm; The raw material ratio of the low thermal conductivity barrier core layer 13 is as follows: Fumed silica aerogel accounts for 12% of the mass, polytetrafluoroethylene propylene resin accounts for 86% of the mass, and polyethylene wax dispersant accounts for 2% of the mass. The particle size of the fumed silica aerogel is 30 nm, and the thermal conductivity is 0.018 W / (m·K). The dry film thickness of the vapor barrier coating 12 is 10 μm, and the raw material ratio is: 8% by mass of nano alumina, 90% by mass of polyvinylidene chloride resin, and 2% by mass of film-forming aid alcohol ester twelve. The sealing adhesive layer 11 has a thickness of 0.3 mm, a Shore hardness of 40 HA, and an air permeability of 0.03 g / m². 2 The outer surface is provided with a continuous serrated microstructure with a tooth height of 0.08 mm; The overall wall thickness of the inner support frame layer 14 is 0.6 mm, the wall thickness of the support ribs 16 is 0.5 mm, and the cross-sectional area of ​​a single enclosed partition cavity is 3.2 mm². 2 ; The preparation process of the composite material low thermal conductivity warm edge spacer in this embodiment includes the following steps: S1. Raw material pretreatment: Vacuum dry polyether ether ketone resin at 150℃ for 6 hours and perfluoroethylene propylene resin at 120℃ for 4 hours. According to the above proportions, the raw materials of the inner support skeleton layer 14 and the low thermal conductivity barrier core layer 13 are weighed out respectively, and after being mixed evenly at high speed, they are melt-blended, extruded, water-cooled and pelletized by a twin-screw extruder to obtain the corresponding composite masterbatch. S2. Multi-layer co-extrusion molding: Two composite masterbatches are added to the two extruders of the twin-screw co-extrusion equipment respectively. The extrusion temperature range of the inner support skeleton layer 14 is 370~380℃, the extrusion temperature range of the low thermal conductivity core layer 13 is 330~340℃, and the temperature of the layered co-extrusion die is 360℃. The two-layer composite substrate with a multi-cavity structure is obtained by integral extrusion through the layered co-extrusion die. Nitrogen gas is introduced into the mold cavity during the extrusion process to maintain a positive pressure of 0.03 MPa inside the cavity, ensuring the integrity of the cavity molding. S3. Surface modification and coating: The outer surface of the extruded double-layer composite substrate is subjected to low-temperature plasma treatment with a power of 1000W and a treatment time of 5s. Subsequently, the prepared vapor phase barrier coating 12 was applied online and cured through a three-stage infrared drying tunnel. The temperatures of the three stages were 60℃, 90℃, and 120℃, and the total curing time was 20 seconds. S4. Sealing layer coating and shaping: Molten sealing adhesive material is coated on the outer surface of the cured substrate online, and then the dimensions are shaped by a vacuum shaping table with a vacuum degree of -0.07MPa and a shaping temperature of 25℃. The product is then cooled in a gradient water cooling tank with cooling water temperatures of 40℃, 25℃, and 15℃ respectively. It is then pulled by a traction machine at a speed of 3m / min, and finally cut to the set size by a cutting machine to obtain the finished product.

[0028] Example 2: The composite material low thermal conductivity warm edge spacer provided in this embodiment has a structure that is basically the same as that in Embodiment 1, with the only difference being: The raw material ratio of the inner support skeleton layer 14 is as follows: continuous basalt fiber accounts for 30% by mass, polyetheretherketone resin accounts for 68% by mass, and silane coupling agent KH560 accounts for 2% by mass. The continuous basalt fiber has a single filament diameter of 12μm and a length of 7mm; The raw material ratio of the low thermal conductivity barrier core layer 13 is as follows: 15% by mass of fumed silica aerogel, 83% by mass of poly(fluoroethylene propylene resin), and 2% by mass of dispersant polyethylene wax; The particle size of the fumed silica aerogel is 40 nm, and the thermal conductivity is 0.015 W / (m·K). The dry film thickness of the vapor barrier coating 12 is 12 μm, and the raw material ratio is as follows: 10% by mass of nano alumina, 88% by mass of polyvinylidene chloride resin, and 2% by mass of film-forming aid alcohol ester twelve. The thickness of the sealing adhesive layer 11 is 0.4 mm, the Shore hardness is 38 HA, and the tooth height is 0.07 mm. The internal support frame layer 14 contains four enclosed partition cavities 15, and the supporting ribs 16 have a wall thickness of 0.4 mm and a cross-sectional area of ​​2.8 mm² for each cavity. 2 ; The preparation process in this embodiment differs from that in Example 1 only in that: In step S2, the extrusion temperature range of the inner support skeleton layer 14 is 375~385℃, the extrusion temperature range of the low thermal conductivity barrier core layer 13 is 335~345℃, the mold temperature is 365℃, and the nitrogen gas pressure is 0.04MPa. In step S3, the plasma treatment power is 1100W, the treatment time is 6s, and the total curing time is 22s. In step S4, the vacuum level is -0.075 MPa and the traction speed is 2.5 m / min.

[0029] Comparative example: This comparative example uses commercially available conventional stainless steel-polypropylene composite warm edge spacers as a control group. Performance testing Performance tests were conducted on the products of Example 1, Example 2, and the comparative example. The test results are shown in the table below:

[0030] The test results show that the product of this invention is significantly superior to commercially available conventional composite warm edge spacers in terms of thermal conductivity, structural strength, weather resistance, and water vapor barrier performance. It perfectly achieves the synergistic unity of ultra-low thermal conductivity, high strength, and long-lasting weather-resistant sealing, solves the core pain points of existing technologies, has outstanding substantive features and significant progress, and meets the inventiveness requirements of invention patents.

[0031] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A composite material low thermal conductivity warm edge spacer, characterized in that: It includes a spacer body (1), which is an integrally formed four-layer heterogeneous composite structure, including an inner support skeleton layer (14), a low thermal conductivity barrier core layer (13), a vapor phase barrier coating (12), and a sealing adhesive layer (11) from the inside to the outside. The inner support skeleton layer (14) is made of continuous basalt fiber reinforced polyether ether ketone composite material, and has at least two independent closed partition cavities (15). The low thermal conductivity barrier core layer (13) is a fumed silica aerogel modified polytetrafluoroethylene propylene composite material; The vapor barrier coating (12) is a nano-alumina modified polyvinylidene chloride composite coating; The sealing adhesive layer (11) is made of butyl rubber modified polyisobutylene hot melt adhesive.

2. The composite material low thermal conductivity warm edge spacer strip according to claim 1, characterized in that: In the inner support skeleton layer (14), the mass percentage of continuous basalt fiber is 20%~35%, the mass percentage of polyether ether ketone resin is 63%~78%, and the remainder is silane coupling agent. The monofilament diameter of the continuous basalt fiber is 9~13μm and the length is 5~8mm.

3. The composite material low thermal conductivity warm edge spacer strip according to claim 2, characterized in that: In the low thermal conductivity barrier core layer (13), the mass percentage of fumed silica aerogel is 8%~18%, the mass percentage of polytetrafluoroethylene propylene resin is 80%~91%, and the remainder is a dispersant. The particle size of the fumed silica aerogel is 20~50nm, and the thermal conductivity is ≤0.02W / m・K.

4. The composite material low thermal conductivity warm edge spacer strip according to claim 3, characterized in that: The dry film thickness of the vapor barrier coating (12) is 8~15μm, wherein the mass percentage of nano-alumina is 5%~12%, the mass percentage of polyvinylidene chloride resin is 85%~94%, and the remainder is film-forming aids.

5. The composite material low thermal conductivity warm edge spacer according to claim 4, characterized in that: The enclosed partition cavity (15) is separated from adjacent cavities by supporting ribs (16) with a wall thickness of 0.3~0.8mm, and the cross-sectional area of ​​a single cavity is 2~5mm². 2 .

6. The composite material low thermal conductivity warm edge spacer strip according to claim 5, characterized in that: The thickness of the sealing adhesive layer (11) is 0.2~0.5mm, its Shore hardness is 35~45HA, and its air permeability is ≤0.05g / m². 2 The outer surface of the sealing adhesive layer (11) is provided with a continuous sawtooth microstructure, and the tooth height of the microstructure is 0.05~0.1mm.

7. A preparation process for a composite material low thermal conductivity warm edge spacer as described in any one of claims 1-6, characterized in that: Includes the following steps: S1. Raw material pretreatment: The raw materials of the inner support skeleton layer (14) and the low thermal conductivity barrier core layer (13) are dried respectively, mixed according to the ratio, and granulated by twin screw extruder to obtain the corresponding composite masterbatch. S2, Multi-layer co-extrusion molding: Two composite masterbatches are added to a twin-screw co-extrusion equipment and extruded in one piece through a layered co-extrusion die to obtain a double-layer composite substrate with a multi-cavity structure. During the extrusion process, inert gas is introduced into the inner cavity of the die to maintain positive pressure inside the cavity. S3, Surface modification and coating: The outer surface of the extruded double-layer composite substrate is subjected to low-temperature plasma treatment, followed by online coating of vapor barrier coating (12), and the coating is cured by infrared drying tunnel; S4. Sealing layer coating and shaping: A sealing adhesive layer (11) is applied online to the outer surface of the cured substrate. Then, the size is shaped by a vacuum shaping table. After cooling, traction and cutting, the low thermal conductivity warm edge spacer of the composite material is obtained.

8. The preparation process of a composite material low thermal conductivity warm edge spacer according to claim 7, characterized in that: In step S2, the extrusion temperature range of the inner support skeleton layer (14) is 360~390℃, the extrusion temperature range of the low thermal conductivity barrier core layer (13) is 320~350℃, the temperature of the layered co-extrusion die is 350~370℃, and the inert gas pressure is 0.02~0.05MPa.

9. The preparation process of a composite material low thermal conductivity warm edge spacer according to claim 8, characterized in that: In step S3, the power of the low-temperature plasma treatment is 800~1200W, and the treatment time is 3~8s; The infrared drying tunnel is divided into three temperature control sections, with temperatures of 60℃, 90℃, and 120℃ respectively, and the total curing time of the coating is 15~25s.

10. The preparation process of a composite material low thermal conductivity warm edge spacer according to claim 9, characterized in that: In step S4, the vacuum degree of the vacuum shaping stage is -0.06 to -0.08 MPa, the shaping temperature is 20 to 30°C, the cooling adopts a gradient water cooling method, the cooling water temperature is 40°C, 25°C and 15°C respectively, and the traction speed is 2 to 5 m / min.

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