1. Properties of nano aerogel insulation felt

1.1 .Thermal conductivity of nano aerogel insulation felt

Aerogel is a kind of nano-pore network structure formed by the mutual aggregation of colloidal particles or polymer molecules. the common nano-aerogel insulation felt is a highly dispersed solid material composed of SiO _ 2 network skeleton and gas filled in nano - pores. Has more than 80 percent of porosity, and the pore diameters of the nano aerogel thermal insulation felts are mesopores between 2 and 50 nm formed by interconnecting nano network frameworks, the density is only 30 to 100 kg / m3, and the thermal conductivity of the nano aerogel thermal insulation felts is only 0102 w / ( m k ) at normal temperature. Therefore, nano aerogel insulation felt is a typical lightweight and excellent thermal insulation material.

1.2 Transmission characteristics of nano aerogel insulation felt

Transmission characteristics of nano aerogel insulation felt
At high temperature, the thermal radiation energy of infrared ray with wavelength less than 8 μ m will almost pass through aerogel, which leads to the sharp rise of thermal conductivity of nano aerogel insulation felt. in order to reduce the thermal conductivity of radiation, it is necessary to compound the opacifier which can absorb or scatter infrared light in nano aerogel insulation felt. common infrared opacifiers are carbon black, TiO 2 and so on.

2 .Preparation of nano aerogel insulation felt

The unique network structure and high porosity and low density of nano aerogel insulation felt lead to the brittleness of aerogel itself. in the high temperature environment, translucent aerogel material is difficult to resist the influence of radiation thermal conductivity. therefore, in many fields, aerogel is difficult to be used as insulation material alone, and it needs to be combined with other materials to achieve the actual use effect. A new type of nano aerogel thermal insulation felt was developed by scientific and technical personnel of Shandong Jinshi high temperature co., ltd after years of repeated experimental research.

The main raw materials for preparing nano aerogel thermal insulation felt are SiO _ 2 aerogel, fiber, carbon black, TiO _ 2 and zirconia.
2.2 development method
Mixing 50 - 60 % ( by mass fraction, the same below ) of SiO 2 aerogel; 3 - 5 % fiber; 10 to 20 percent of carbon black; 5 - 10 % TiO 2; Adding 10 to 15 percent of zirconia into a special mixing device to be evenly stirred, and performing hydraulic compression molding to prepare a 200 * 300 * 20 nano aerogel thermal insulation felt.
2.3 performance and characteristics
The nano aerogel thermal insulation felt is a novel thermal insulation material molded by compression molding, has low thermal conductivity, is tested by an authoritative mechanism at 800 deg c, has a thermal conductivity of 0.037 w / ( m k ), and has a heating wire change rate of 1.7 percent; Secondly, the high temperature resistance is good, and the high temperature resistance is over 1000 deg c; Long-term use without deformation, pulverization, performance degradation, in the conventional use environment has a very long life, no need of replacement and maintenance; Low density bulk density can be designed as required between 200 kg / m3 and 600 kg / m3; The environment-friendly non-toxic doe not release any gas or organic matter at high temperature.