A new method for assembling silica rubber by using aerogel material

Abstract

The present application relates to a new type of aerogel material silicone rubber bonding assembly method, which solves the problems of infiltration and bubbles in the traditional coating process. The specific method includes: 1) material and equipment: KH-RTV-400 adhesive, the ratio of base glue and curing agent is 100:4; glue scraping plate, stirring equipment, coating tool; 2) operation steps: mix the base glue and curing agent according to the proportion, stir evenly; use the glue scraping plate to thinly scrape a layer of glue solution on the surface of aerogel, ensure uniform coverage; after waiting for the first layer of glue to solidify, prepare the glue solution containing 20% diluent again for the second coating. The present application not only improves the quality of the protective layer, but also enhances the performance of the overall structure, providing a more reliable guarantee for the application of aerogel materials in the fields of construction, aerospace and other fields. In addition, the present application has the advantages of simple process, low cost, high efficiency and energy saving, and has broad market prospect and popularization value.

Description

Technical Field

[0001] This invention belongs to the field of materials science, and specifically relates to a process method for surface treatment of porous materials. More specifically, this invention is used to improve the adhesion between alumina-silica aerogel and other substrates to meet the needs of high-performance thermal insulation applications (such as external thermal protection systems). Background Technology

[0002] Alumina-silica aerogel is a high-performance porous material with low density, high specific surface area, and excellent thermal insulation properties. This material is widely used in the aerospace field, especially in external thermal insulation systems, as it can effectively reduce the thermal impact of the external environment on aircraft.

[0003] However, alumina-silica aerogels face a key challenge in practical applications: due to their highly porous structure, when directly bonded to other materials using traditional adhesives, the adhesive seeps into the aerogel's pores. This phenomenon leads to several serious problems: 1. Degraded adhesive performance: After the adhesive penetrates into the aerogel, a uniform bonding layer cannot be formed on the surface, thus reducing bond strength. 2. Damaged aerogel structure: The adhesive filling the pores may damage the aerogel's porous structure, affecting its thermal properties and mechanical strength. 3. Reliability issues: Uncontrollable adhesive penetration results in defects at the final bonding interface, affecting the overall durability and reliability of the structure.

[0004] Currently, surface treatment methods for aerogel materials mainly include the following: 1. Chemical etching: Treating the aerogel surface with acid or alkali solutions to increase surface roughness. However, this method may damage the porous structure of the aerogel, affecting its thermal properties. 2. Coating a protective layer: Coating the aerogel surface with a sealing material, but this not only increases the complexity of the process but may also reduce the insulation properties of the aerogel.

[0005] Furthermore, traditional adhesives are difficult to control the penetration depth during the bonding process, resulting in the inability to form an ideal bonding interface. This method is particularly unsuitable for high-precision fields such as aerospace, where extremely high material performance requirements are necessary. Summary of the Invention

[0006] This invention provides a novel aerogel material silicone rubber bonding assembly method, which solves the problems of seepage and air bubbles that occur in the traditional coating process.

[0007] This invention is achieved through the following technical solutions: A novel silicone rubber bonding assembly method for aerogel materials employs a step-by-step thin-coating process. First, a high-viscosity adhesive is used to seal the pores, forming a dense surface layer. Then, a low-viscosity adhesive is used for assembly, ensuring the bonding strength and durability between the aerogel and other substrates while maintaining its excellent porous structure and thermal properties.

[0008] Specific methods include: 1) Materials and equipment: KH-RTV-400 adhesive, with a base adhesive to curing agent ratio of 100:4; trowel, mixing equipment, and coating tools; 2) Operating steps: Mix the base adhesive and curing agent in proportion and stir evenly; use a scraper to apply a thin layer of adhesive to the aerogel surface to ensure even coverage; after the first layer of adhesive has cured, prepare another layer of adhesive containing 20% ​​thinner and apply it for the second coat.

[0009] This invention not only improves the quality of the protective layer but also enhances the overall structural performance, providing a more reliable guarantee for the application of aerogel materials in fields such as construction and aerospace. Furthermore, this invention has advantages such as simple process, low cost, and high energy efficiency, and has broad market prospects and promotional value. Detailed Implementation

[0010] This invention proposes a method for forming a dense protective layer on the surface of aerogel by optimizing the formulation of KH-RTV-400 silicone rubber adhesive, thereby effectively solving the problems of seepage and air bubbles that occur in traditional coating processes. Through a step-by-step process, a high-viscosity adhesive is first used to seal the pores, forming a dense surface layer, and then a low-viscosity adhesive is used for assembly. This ensures the bonding strength and durability between the aerogel and other substrates, while maintaining its excellent porous structure and thermal properties. This invention not only preserves the porous structure and thermal properties of aerogel but also significantly improves its reliability in applications such as aerospace.

[0011] Example 1: Traditional assembly method Materials and equipment: KH-RTV-400 adhesive (base adhesive to curing agent ratio of 100:4); thinner: 10% cyclohexane; mixing equipment and coating tools; Operating steps: Mix the base adhesive and curing agent in the specified ratio and stir until homogeneous; add the thinner and continue stirring until fully dissolved; use a suitable coating tool to evenly coat the mixed adhesive onto the aerogel surface; Results: Obvious seepage of the adhesive was observed, which damaged the internal structure of the aerogel; many air bubbles appeared on the surface of the adhesive layer, affecting the bonding performance and appearance.

[0012] Example 2: No diluent added Materials and equipment: KH-RTV-400 adhesive (base adhesive to curing agent ratio of 100:4); mixing equipment and coating tools.

[0013] Operating steps: Mix the base adhesive and hardener in the specified ratio and stir well; apply the undiluted adhesive directly. Results: Compared with Example 1, bubbling was significantly reduced, but the reduced fluidity led to uneven coating; slight seepage still occurred on the surface of the aerogel in some areas, affecting the overall performance.

[0014] Example 3: Step-by-step thin coating method Materials and equipment: KH-RTV-400 adhesive (base adhesive to hardener ratio of 100:4); squeegee, mixing equipment, coating tools; Operating steps: Mix the base adhesive and curing agent in the specified ratio and stir evenly; use a scraper to apply a thin layer of adhesive to the aerogel surface, ensuring even coverage; after the first layer of adhesive has cured, prepare another layer of adhesive containing 20% ​​thinner and apply it for the second coat.

[0015] Results: Almost no bubbles were generated, and a dense adhesive layer was formed on the aerogel surface; during the second coating, there was no significant seepage of the adhesive, and the adhesion and durability were significantly improved.

[0016] This invention, through the stepwise thin-coating method described in Example 3, successfully solves the problems of air bubbles and seepage in traditional methods. This process not only improves the protective effect of the aerogel but also enhances the stability of the overall structure, possessing significant practical value.

[0017] The step-by-step thin-coating method of this invention not only solves the problem of excessive adhesive penetration in traditional processes, but also preserves the porous structure and thermal properties of aerogel, significantly improving its reliability and service life in high-performance thermal insulation applications. Its core innovation lies in its step-by-step processing method: 1. High-viscosity adhesive as a sealing layer: By utilizing the low flowability of high-viscosity adhesive, damage to the internal structure of the aerogel is effectively reduced, while forming a dense protective barrier.

[0018] 2. Low-viscosity adhesives are used in the assembly stage: Using low-viscosity adhesives after the sealing process not only improves the filling effect of the gaps between the contact surfaces, but also ensures a strong bond between the aerogel and the substrate.

Claims

1. A novel aerogel material silicone rubber bonding assembly method, characterized in that: A step-by-step thin-coating method is adopted. First, a high-viscosity adhesive is used to seal the pores and form a dense surface layer. Then, a low-viscosity adhesive is used for assembly to ensure the bonding strength and durability between the aerogel and other substrates, while maintaining its excellent porous structure and thermal properties.

2. The novel aerogel material silicone rubber bonding assembly method according to claim 1, characterized in that: specifically... include: 1) Materials and equipment: KH-RTV-400 adhesive, with a base adhesive to curing agent ratio of 100:4; trowel, mixing equipment, and coating tools; 2) Operating steps: Mix the base adhesive and curing agent in proportion and stir evenly; use a scraper to apply a thin layer of adhesive to the aerogel surface to ensure even coverage; after the first layer of adhesive has cured, prepare another layer of adhesive containing 20% ​​thinner and apply it for the second coat.