Aerogel board is a high-tech material with unique properties. It is made of aerogel core, has ultra-low density, high porosity and excellent thermal insulation performance. Unlike traditional viscous or gel-like materials, the structure of aerogel board is a porous solid network formed by a special synthesis process, which is highly lightweight and functional. Due to its excellent thermal insulation, compression resistance and flame retardant ability, aerogel board is widely used in building energy conservation, aerospace and special environments. This article will deeply explore the performance characteristics, application fields and future development trends of aerogel board to help readers better understand the unique advantages and potential of this innovative material.
Content
1. Basic definition of aerogel materials
2. Comparative analysis of material properties
3. Verification of technical application scenarios
4. Conclusion and standardization recommendations
1. Basic definition of aerogel materials
Aerogel is a porous solid material prepared by a special process with extremely low density and high porosity. According to the definition of the International Materials Society, aerogel is a "porous material that retains a solid skeleton through supercritical drying". Its core characteristic is that its solid skeleton retains a large number of gas pores, which makes aerogel have ultra-low density and excellent thermal insulation performance. Unlike viscous or colloidal materials, aerogel does not have adhesion or fluidity, so there are essential differences in physical state and preparation process. Hydrogel and silica gel are colloidal substances formed by combining water or other solvents with solid substances, which have certain viscosity or elasticity, while aerogel removes liquid components from the material through processes such as sol-gel method and supercritical drying, and retains a dry, solid network structure.
However, in some industries, aerogel is combined with adhesives to develop composite materials, which may lead to public misunderstanding of the essential properties of aerogel. In fact, as a solid porous material, aerogel does not have the viscosity or adhesion function of traditional colloidal materials. Understanding this is crucial for better application and development of aerogel technology.
2. Comparative analysis of material properties
Viscous materials are semi-solid substances that rely on intermolecular forces to maintain fluidity. Common viscous materials include epoxy resins, pressure-sensitive adhesives, etc. These materials usually have high viscosity and thixotropy, and can deform and maintain a certain shape under external forces. Its key indicators include viscosity, which determines fluidity, thixotropy, which affects performance at different shear rates, and bonding strength, which indicates its ability to combine with other materials. These characteristics make viscous materials commonly used in applications such as sealing, coating and bonding.
Aerogel is a highly porous solid material with very low density and excellent thermal insulation properties. For example, the nano-scale open-pore structure of polyurethane-based aerogel effectively limits heat conduction, making it an excellent thermal insulation material. However, unlike viscous materials, aerogels do not have adhesion. Its mechanical properties are manifested as a rigid solid frame, and the compressive strength after drying usually reaches ≥0.5MPa, and the dynamic mechanical behavior is significantly different from that of viscoelastic gels. The surface properties of aerogels can adjust the surface energy through hydrophobic or hydrophilic modification, but they still do not have self-adhesiveness.
Some aerogel composites may use adhesives as the interface layer, which may lead to the public's misunderstanding that aerogels have adhesive properties. In fact, aerogels themselves are not sticky, and their functions are mainly reflected in thermal isolation and structural rigidity. In addition, in the early development of aerogels, the intermediate state of the sol-gel stage may be mistaken for the characteristics of sticky materials, further exacerbating the misunderstanding of the properties of aerogels.
3. Verification of technical application scenarios
Typical non-adhesive application cases
The application of aerogel in many fields has fully verified its advantages as a non-adhesive material. In the field of building insulation, aerogel is often inserted into the wall cavity as a filling insulation layer, which can effectively improve the thermal insulation performance of the building without bonding. Due to its ultra-low density and excellent thermal insulation performance, aerogel can be easily embedded in the building structure to form a strong thermal insulation barrier, reduce energy consumption, and improve the energy-saving effect of the building. In the application of industrial pipelines, aerogel also shows its non-adhesive characteristics. The prefabricated pipe shell is installed by mechanical snap-on method. The aerogel is used as the thermal insulation material of the pipe and is directly embedded in the pipe shell without the use of adhesive. This installation method is not only simple and efficient, but also avoids the aging and performance degradation problems that may be caused by traditional adhesive materials.
Composite application containing adhesive
Although aerogel itself does not have adhesive properties, its combined application with adhesives in composite materials shows unique advantages. For example, in the multi-layer insulation system of spacecraft, aerogel felt and aluminum foil are laminated by silicone bonding to form a strong thermal protection layer. This composite structure can effectively withstand extreme temperature differences while maintaining lightweight and high strength, meeting the application requirements of spacecraft in extreme environments. In addition, aerogels are also widely used in the field of functional coatings. By dispersing aerogel powder in a binder, an efficient thermal insulation coating can be prepared. This coating not only has good thermal insulation properties, but can also adhere to various surfaces to provide long-lasting thermal insulation protection.
4. Conclusion and standardization recommendations
In order to promote the standardized application of aerogel materials and improve the overall technical level of the industry, it is first recommended to strictly distinguish between "pure aerogel" and "aerogel composite materials" in the naming of materials. "Pure aerogel" refers to materials composed only of aerogel substrates, while "aerogel composite materials" are composites formed by the combination of aerogel and other materials. This naming convention can help industry personnel accurately understand the essential characteristics of aerogels and avoid misunderstandings about their functions, especially in applications involving bonding and structural stability. In addition, the adhesion test standards for aerogels need to be improved. It is recommended to improve the existing ASTM C1784 standard and add detailed test requirements for the adhesion between aerogels and external interfaces, including bonding strength, durability, and performance under different environmental conditions. The improvement of these test standards can provide a more accurate technical basis for the industrial application of aerogels and promote their widespread application in the fields of construction, aerospace, electronics, etc.
As a non-sticky porous solid material, aerogel has extremely low density and excellent thermal insulation, but it does not essentially have the adhesion properties of traditional sticky materials. Therefore, in the actual application of aerogels, if bonding function is required, it is usually necessary to use exogenous adhesives to achieve it. Understanding this essential characteristic helps avoid misunderstandings about aerogel performance, allowing for more scientific and rational use of aerogel materials in industrial design and engineering applications. With the continuous development of material technology, interdisciplinary cooperation and the advancement of standardization will contribute to the healthy development of the aerogel industry and promote its application and technological innovation in energy conservation, environmental protection, aerospace, electronic equipment and other fields.