Preparation method of polyester fiber compounding type silicon dioxide aerogel cold insulation felt

Abstract

The invention discloses a preparation method of polyester fiber compounding type silicon dioxide aerogel cold insulation felt. The method comprises the following steps of (1) preparing a silicon dioxide aerogel solution, wherein the silicon dioxide aerogel solution is prepared from the following raw materials of a silicon source precursor, a solvent, a hydrolysis catalyst and a modifying agent; (2) compounding and shaping polyester fiber felt aerogel; (3) maturing the compounded and shaped polyester fiber felt aerogel; (4) aging the matured polyester fiber felt aerogel; (5) performing secondary maturing on the aged polyester fiber felt aerogel; (6) performing surface modification on the polyester fiber felt aerogel subjected to secondary maturing; (7) drying and detecting the polyester fiber felt aerogel subjected to surface modification. The prepared polyester fiber compounding type silicon dioxide aerogel cold insulation felt disclosed by the invention has the advantages that the heat isolation / cold insulation performance is excellent; the adjustable range is wide; the applicability is high; the biological aging resistance is realized; the anti-condensation and hydrophobic performance are good; the construction is convenient. The preparation method avoids a solvent replacement step; the operation is simple and easy; the process is controllable; the production continuity is realized.

Description

technical field [0001] The invention relates to a preparation method of a polyester fiber composite silica airgel cold-preservation blanket, which belongs to the technical field of chemical materials. Background technique [0002] SiO 2 Airgel is a light nanoporous amorphous solid material with controllable structure, its porosity is as high as 80%-99.8%, the pore size is 1-100nm, and the high specific surface area is 200-1000 m 2 / g, low density change range 3~500kg / m 3 , The thermal conductivity at normal temperature and pressure is less than 0.013 W / mK, which is lower than that of still air (0.026 W / mK), and it is the solid material with the lowest thermal conductivity at present. [0003] At present, the main problems faced by the industrialization of silica airgel include: complex preparation process, long preparation cycle, large solvent consumption, large waste liquid, low airgel strength, high brittleness and other shortcomings, which limit the development of silic...

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a kind of polyester fiber composite SiO 2 The preparation process of airgel cold insulation felt is to solve the technical problems of complex preparation process, long preparation cycle, large solvent consumption, large waste liquid, and high brittleness faced by the industrialization of silica airgel cold insulation materials, and to realize the temperature at Work in an environment between -200°C and +150°C