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Structural brittleness and pulverization failure problems: Pure silica aerogels are highly brittle, prone to powder loss and cracking during cutting, bending, and on-site construction, which not only causes material loss and pollution of the construction environment, but also directly leads to the collapse of the nano-porous skeleton. The irreversible failure of thermal insulation performance is the primary obstacle restricting their on-site large-scale application.
The surface of pure silica aerogel is rich in hydroxyl groups and is intrinsically hydrophilic; while the thermal conductivity of water (0.6W/(m · K)) is 24 times that of static air. Once the material absorbs water, the thermal conductivity increases exponentially, and the thermal insulation function is completely lost. The later surface spraying hydrophobic process commonly used in the industry is prone to internal hydrophobic failure due to surface wear and cutting damage, and cannot adapt to long-term harsh working conditions such as high humidity, coastal areas, underground pipe corridors, and chemical condensation.
The irreversible attenuation of thermal performance in long-term service is impressive in the detection data of most new aerogel products on the market, but in long-term hot and cold cycling, high temperature aging, and corrosive environments, the nano-porous structure will slowly collapse, and the infrared sunscreen will appear agglomerated and migrated. Generally, the thermal conductivity will double within 3-5 years, and the thermal insulation effect will decline sharply, which cannot meet the long-life design requirements of industrial and construction projects for more than 10 years.
The construction adaptability of complex working conditions is seriously insufficient. Traditional aerogel products are mostly semi-rigid materials such as felts and plates. For complex structures such as special-shaped equipment, variable diameter pipelines, valve flanges, and building corners, they cannot be fully attached, and it is easy to form a thermal bridge, causing local heat loss to exceed the standard. At the same time, the integrated requirements of heat preservation, anti-corrosion, and waterproofing cannot be taken into account. Multi-layer composite construction is prone to interlayer separation and hollow drum falling off, which greatly increases construction and maintenance costs.
Qingdao Ruida Intelligent Coating Technology Materials Co., Ltd. has been deeply involved in the field of waterproof, anti-corrosion and thermal insulation engineering. In response to the common pain points of the above industries, it has carried out full-chain modification and optimization of silica aerogel materials with engineering landing requirements as the core, forming a high-performance aerogel product system suitable for multiple scenarios.
The dual-phase composite reinforcement system completely solves the problem of brittle pulverization. The dual-phase composite reinforcement technology of inorganic fiber skeleton + organic flexible modifier is used to greatly improve the mechanical properties of the material without destroying the aerogel nano-porous structure and without losing the heat insulation performance. The compressive strength of the product is ≥0.25 MPa and the flexural strength is ≥0.18 MPa, which can be bent and cut arbitrarily, and there is no powder loss or fragmentation during the construction process. After 100 cycles of cold and heat at -40 ° C to 650 ° C, the pore structure does not collapse, and the thermal conductivity decay rate is ≤5%, ensuring the stability of the performance throughout the life cycle of the project.
In-situ overall hydrophobic modification technology eliminates the hidden dangers of water absorption failure. Abandons the late-stage surface spraying hydrophobic process commonly used in the industry, and adopts in-situ molecular grafting hydrophobic modification technology. In the sol-gel reaction stage, the hydrophobic groups are directly grafted onto the molecular chain of the silica skeleton to realize the global overall hydrophobic of the material from the surface to the interior. The hydrophobic rate of the product is stable ≥99%, and the water absorption rate is ≤1% after soaking at room temperature for 72h. Even after cutting and wear, the interior still maintains stable hydrophobic performance, which is perfectly suitable for marine engineering, coastal buildings, underground pipe galleries, petrochemical storage tanks and other high-humidity, high-salt fog, strong corrosion and harsh working conditions.
Precise infrared shading technology to achieve stable performance in the whole temperature area. Aiming at the pain point of high radiation heat transfer in medium and high temperature industrial scenarios, based on the infrared radiation characteristics of different service temperatures, accurate multi-scale nano-scale infrared shading agents are combined to optimize the particle size, crystal form and addition ratio of the shading agent. While ensuring high porosity of the material, the reflection and absorption efficiency of the infrared band are greatly improved. The thermal conductivity is stably controlled within 0.04W/(m · K) at high temperatures at 200 ° C, which solves the industry problem of sharp performance degradation of traditional aerogels at high temperatures. It is suitable for medium and high temperature insulation scenarios such as petrochemical pipelines, reactors, and industrial kilns.
In addition to conventional aerogel insulation felt and insulation board, for complex special-shaped structures, existing engineering transformation, and integrated construction needs, customized products such as aerogel insulation coatings and aerogel anti-corrosion insulation integrated coatings have been developed. They can be constructed by brushing, spraying, and scraping, and are perfectly adapted to complex structures such as special-shaped equipment, variable diameter pipelines, valve flanges, and building exterior walls. There are no construction dead ends, and the hidden dangers of thermal bridges are completely eliminated. At the same time, the integration of thermal insulation, anti-corrosion, and waterproof functions is realized, without the need for multi-layer composite construction, which greatly reduces construction costs and shortens the construction period, and solves the core pain points of separation between layers and single function of traditional thermal insulation materials.
