Aerogel is a porous material with a nanoscale structure. It is known as the smoke among solids because of its ultra-light and ultra-insulating properties. In recent years, with the development of high-efficiency energy-saving technology, the application of aerogel in aerospace, building insulation, industrial pipelines and other fields has gradually expanded. However, as a new type of high-performance material, aerogel also faces challenges in price and practicality. This article will systematically analyze the main advantages and disadvantages of aerogel materials to help readers fully understand this future material.
Content
1.1 Excellent thermal insulation performance
1.2 Lightweight, efficient, and easy to install
1.3 Excellent waterproof performance
1.4 Flame retardant and strong safety
1.5 Durability and environmental protection
2. Main disadvantages of aerogel
1.1 Excellent thermal insulation performance
Aerogel, due to its unique nanoporous structure, exhibits extremely low thermal conductivity and is one of the solid materials with the best known thermal insulation properties. Taking silica aerogel as an example, its internal porosity is as high as over 90%, and the nanoscale pores effectively inhibit the thermal motion of gas molecules and gas-solid heat conduction, and it can still maintain excellent thermal insulation even in high-temperature environments above 650°C. In contrast, the thermal conductivity of traditional insulation materials increases significantly at high temperatures, and the stability of aerogel makes it the first choice for extreme working conditions such as petrochemicals and aerospace. For example, in pipeline insulation applications, aerogel can significantly reduce heat loss and increase energy-saving efficiency by more than 30%, while avoiding the risk of burns to personnel from high-temperature surfaces.
1.2 Lightweight, efficient, and easy to install
Aerogel is only 1/5 to 1/3 the thickness of traditional materials, but it can provide the same or even better thermal insulation effect, significantly saving installation space, and is especially suitable for places with limited space, such as ship cabins or dense pipelines in chemical plants. Its flexibility allows complex-shaped equipment to be directly wrapped without the need for customized molds. After cutting, it can be fixed by overlapping or binding, which improves construction efficiency by more than 50%. In addition, the light and thin characteristics reduce the support load and reduce the cost of structural reinforcement. Traditional materials are prone to thermal bridge effects due to their large thickness, while the continuous coverage of aerogel can effectively block the heat conduction path. For example, in building exterior wall applications, condensation and energy loss caused by cold and hot bridges can be avoided.
1.3 Excellent waterproof performance
Aerogel has been treated with hydrophobic modification, with a hydrophobic rate of over 98%, a water drop contact angle of over 150°, and almost no moisture absorption. This feature makes it outstanding in humid or open-air environments, avoiding the problem of soaring thermal conductivity of traditional materials after absorbing water. Taking oil pipelines as an example, aerogel can resist erosion by rain and condensation water for a long time, prevent corrosion under the insulation layer, and extend the life of the equipment to more than 20 years. In contrast, the thermal insulation performance of rock wool decreases by 80% after absorbing water, and it is easy to breed mold. The closed-cell structure of aerogel also eliminates frost heave damage caused by water penetration, and is suitable for scenes such as low-temperature storage tanks.
Aerogel is an inorganic non-metallic material with a flame retardant grade of A. It does not release toxic smoke when exposed to fire, and its oxygen index exceeds 60%, which is much higher than organic insulation materials such as polyurethane. In a fire, aerogel can effectively slow the spread of flames and buy time for evacuation and rescue. For example, in high-speed rail carriages or power facilities, the aerogel insulation layer can withstand short-term high temperatures of 1000°C to protect core equipment from damage. In addition, its low smoke characteristics meet strict standards such as EU EN13501, avoiding secondary hazards, and is particularly suitable for places with extremely high fire protection requirements such as tunnels and high-rise buildings.
1.5 Durability and environmental protection
Aerogel is mainly composed of inorganic components such as silicon dioxide, and has strong aging resistance. It has a stable structure in the range of -200℃ to 650℃, a compressive strength of 0.2-0.5 MPa, and a service life of 20-30 years, which is the same as the equipment. Its environmental friendliness is reflected in two aspects: first, it does not contain harmful substances such as asbestos and VOCs, and the production and use processes are pollution-free; second, it can be recycled and reused, and can be crushed and remade into insulation slurry after being discarded. Compared with traditional materials, rock wool is difficult to degrade after being discarded, and the low-carbon properties of aerogel are in line with the global trend of carbon neutrality. For example, in the green building certification (LEED), aerogel can get extra points for its sustainability.
2. Main disadvantages of aerogel
Although aerogel performs well in terms of heat insulation, fire prevention, and moisture resistance, its high cost is still the main obstacle to its widespread application. Due to the complex production process and high cost of raw materials, the current price of aerogel is much higher than that of traditional insulation materials such as glass wool, rock wool or polyurethane foam. This makes it difficult to promote in cost-sensitive projects and is only suitable for high-end or extremely high performance application scenarios, such as aerospace, military industry, petrochemical and other fields.
In addition, aerogel has certain dust drop problems during use. Its material structure is fragile and it is easy to generate fine dust during processing or installation, which is particularly unfavorable in clean rooms or environments requiring high cleanliness. In order to avoid the impact of dust on operators and equipment, aerogel usually needs to be coated, which increases the complexity of construction and additional costs, and also limits its direct use in some fields.
In summary, aerogel, as a cutting-edge high-performance thermal insulation material, is becoming an important choice in the industrial and high-end construction fields due to its excellent thermal insulation, fire resistance, moisture resistance and environmental protection properties. Although its high cost and dust problem are still the main factors limiting its widespread application, with the continuous improvement of production technology and large-scale development, the application prospects of aerogel are still broad. In the future, aerogel is expected to play a more critical role in achieving green energy conservation and material upgrading.