The water absorption rate of hydrophobic thermal insulation materials is an important factor that should be considered when selecting thermal insulation materials. The thermal conductivity of water at room temperature is 23.1 times that of air. After the heat insulation material absorbs water, it will not only greatly reduce its heat insulation function, but also accelerate the corrosion of the metal, which is very harmful. The open space structure of thermal insulation materials is divided into connected, closed, and semi-closed types. Except for a few organic foam plastic open spaces, most of them are closed. Regardless of the open space, the material itself absorbs water, plus the open space connected The capillary is soaked and absorbed, so the overall water absorption rate is high. At present, most thermal insulation materials are not water-repellent, which requires waterproof treatment on the outer layer, which intangibly increases the cost. According to related reports, the use of strong chemical affinity between organic silicon compounds and inorganic silicates can effectively modify the appearance of silicate materials to achieve a hydrophobic effect. This method has good stability, low cost, and technology. Concise and other features. Therefore, improving the hydrophobicity of thermal insulation materials and reducing water absorption are one of the primary development directions of various thermal insulation materials.
Foam insulation materials Foam materials have the characteristics of honeycomb structure, high porosity, low density, low thermal conductivity, etc., and are widely used in the field of energy saving and heat insulation. In recent years, the development and use of nuclear energy has attracted the attention of countries all over the world. However, with the onset of the nuclear accident at the Fukushima nuclear power plant in Japan, nuclear safety has become the primary question that countries think about. Therefore, various materials used for nuclear energy generation equipment will be corresponded. The function puts forward higher demand. Because of its outstanding high temperature resistance, corrosion resistance, thermal shock resistance and other advantages, foam ceramics will not affect its function due to nuclear radiation when used as a thermal insulation material in the nuclear industry, and then cause safety hazards. In addition, foam glass is used as a building insulation material, which not only saves a lot of renewable energy, but also reduces environmental pollution to a certain extent, has an environmental protection effect, and has outstanding social and economic benefits.
The thermal power industry of environmentally friendly thermal insulation materials has doubled, and the distance between the discharge of fly ash and the amount of use has been expanding. The baggage of fly ash has become a problem that puzzles the company’s sustainable development. In the near future , Will restrict the development of China’s power industry, so how to use fly ash and deal with its pollution has become a need for social development. At present, some experts are discussing the use of fly ash to prepare thermal insulation materials for thermal kilns, and certain development has been achieved. In addition, light-weight foam insulation materials of organic composition are very difficult to degrade naturally, especially white pollution caused by non-degradability of polystyrene foam and polyurethane foam has become a worldwide environmental protection problem. Therefore, from the perspective of the country’s increasing strengthening and attention to environmental protection, environmentally friendly heat insulation materials will also become one of the important directions for the development of heat insulation materials.
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