Nano silicon thermal insulation material and preparation method thereof

Abstract

The invention provides a nano silicon thermal insulation material. The nano silicon thermal insulation material comprises a high temperature layer and a low temperature layer which is composited onto the high temperature layer; the low temperature layer consists of 60 to 80 parts by weight of nano silicon dioxide, 5 to 15 parts by weight of inorganic fibers and 15 to 35 parts of carbon black; the high temperature layer consists of 60 to 80 parts by weight of nano silicon dioxide, 5 to 15 parts by weight of inorganic fibers and 15 to 35 parts of an infrared shading agent; the infrared shading agent is one or more of titanium dioxide, zirconia, silicon carbide and potassium hexatitanate whisker. According to the nano silicon thermal insulation material, the effective extinction coefficient and the temperature resistance of different infrared shading agents of different types are adequately utilized, and the nano silicon thermal insulation material with ultralow heat conduction coefficient which can be used in a high temperature area can be prepared by utilizing different infrared shading agents of different types in a gradient manner.

Description

technical field [0001] The invention relates to the field of thermal insulation materials, in particular to nano silicon thermal insulation materials and a preparation method thereof. Background technique [0002] Traditional insulating refractory materials such as lightweight bricks, refractory fibers, and ceramic fiber blankets have relatively high thermal conductivity, and cannot meet the energy-saving requirements of industrial equipment with an outer wall temperature of less than 70 °C at a given thickness. Therefore, insulating materials with low thermal conductivity are becoming more and more popular. favored by people. In the early 1990s, A.J. Hunt and others first proposed the concept of super insulation materials, that is, insulation materials whose thermal conductivity is lower than that of "still air" under specific conditions of use. [0003] At present, there are two main types of super insulation materials: one is vacuum insulation materials, and the other is...

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Problems solved by technology

Its anti-radiation layer only contains infrared opacifying agent and does not contain any reinforcing materials. Dry pressing cannot guarantee its strength and affect the use effect.

Moreover, although the addition of the anti-radiation layer can effectively suppress radiation heat transfer, the thermal conductivity of the components that make up the reinforcement layer and the anti-radiation layer are both large, and the thickness of the anti-radiation layer is relatively thin. , especially after the temperature is higher than 600°C, the heat will be quickly transferred to the insulation layer, and the interface temperature between the anti-radiation layer and the insulation layer will also continue to rise. According to Boltzmann's law, the radiation heat transfer effect in the insulation layer Enhanced, manifested as increased thermal conductivity and poor thermal insulation performance

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