Efficient thermal insulation cellucotton felt and production method thereof

Abstract

The invention discloses an efficient thermal insulation cellucotton felt and a production method thereof. According to the efficient thermal insulation cellucotton felt, the porosity is larger than 93%, the thickness is 5mm-20mm, the fiber monofilament diameter is smaller than or equal to 3mum, and closed vacuum balls that are smaller than 20nm in diameter are uniformly distributed on fiber monofilaments. According to the efficient thermal insulation cellucotton felt and the production method thereof, the porosity of the cellucotton felt is greatly improved, the thermal conductivity of the cellucotton felt is lowered, any binding agent is not added in the felt, the felt has the advantages that the felt is free of toxicity, resistant to high temperature, flexible in texture, small in volume density and reusable between high temperature and low temperature and the thermal insulating property is not remarkably reduced though the felt is used at the high temperature, the maximum using temperature can reach 1000 DEG C, and the felt can be widely applied to fire prevention and thermal insulation of high temperature devices and especially applied to heat preservation and thermal insulation of devices that are usually required to be switched between high and low temperatures.

Description

technical field [0001] The invention belongs to the field of inorganic materials, and specifically relates to a high-efficiency heat-insulating fiber felt and a preparation method thereof, which can be widely used for fire prevention and heat insulation of various equipment below 1000 °C, especially for equipment that needs to be frequently switched between high and low temperature insulation. Background technique [0002] With the advancement of science and technology and the development of aerospace technology, people's requirements for high-temperature insulation materials are also increasing. Traditional high-temperature insulation materials such as asbestos and rock wool can no longer meet the requirements due to their high thermal conductivity. High-silica glass fiber is a high-temperature-resistant inorganic fiber with a high softening point and a relatively low thermal conductivity. However, for some applications that require lower thermal conductivity, traditional h...

AI Technical Summary

Problems solved by technology

[0002] With the advancement of science and technology and the development of aerospace technology, people's requirements for high-temperature insulation materials are also increasing. Traditional high-temperature insulation materials such as asbestos and rock wool can no longer meet the requirements due to their high thermal conductivity.

High-silica glass fiber is a high-temperature-resistant inorganic fiber with a high softening point and a relatively low thermal conductivity. However, for some applications that require lower thermal conductivity, traditional high-silica cotton felts are already difficult. Meet the requirements

[0003] At present, there are many patents disclosing the use of inorganic fiber-reinforced aerogels for thermal insulation materials, which have high heat resistance and low thermal conductivity. However, due to the high rigidity and poor plasticity of this composite material, it is difficult to Thermal insulation for special-shaped bodies or spaces; at the same time, the preparation process of airgel is very complicated, and the equipment is expensive, so it is not conducive to the wide application and promotion of this technology