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

The technology of polyester fiber and silica is applied in the field of preparation of polyester fiber composite silica aerogel cold insulation felt. The effect of less consumption, simple process and short preparation cycle

Inactive Publication Date: 2019-03-08
GUIZHOU AEROSPACE WUJIANG MACHINERY & ELECTRICITYEQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 prepar...

Method used

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preparation example Construction

[0031] A kind of preparation method of polyester fiber composite type silica airgel cold insulation blanket of the present invention, the method comprises the following steps:

[0032] 1) Preparation of silica airgel glue, the raw materials of the silica airgel glue include silicon source precursors, solvents, hydrolysis catalysts and modifiers; the silicon source precursors include orthosilicic acid One or more mixtures of ethyl ester, methyl orthosilicate, trimethylchlorosilane; the hydrolysis catalyst includes pure water, oxalic acid, hydrochloric acid, nitric acid, sulfuric acid, acetic acid, ammonia water, ammonium fluoride, carbonic acid Ammonium, ammonium bicarbonate, or a mixture of two or more; the modifier includes hexamethyldisilazane, silazane, ethyl cellulose, N,N-dimethylformamide, N , a mixture of one or more of N-dimethylacetamide, formamide, acetamide and alkylating reagents; the solvents include methanol, ethanol, butanol, etc., with a mass fraction of more t...

Embodiment 1

[0040] The preparation process of the polyester fiber composite silica airgel cold insulation felt includes the following steps: preparation of silica gel liquid → molding of polyester fiber felt airgel → aging → aging → drying → testing. Prepare the silica airgel glue in the following volume ratio: ethyl orthosilicate: denatured alcohol (99%): hydrolysis catalyst: modifier = 10:80:1.2:1. The water catalysts are 0.02mol / L hydrochloric acid solution and 0.01mol / L ammonia solution respectively, and the reaction time is 5h. Inject the reaction glue into the pavement with a thickness of 3mm and a density of 35kg / m 3 The gel tank of the polyester fiber felt is used to saturate the polyester fiber felt to absorb the glue. The polyester fiber felt has no bubbles or depressions, and the upper and lower surfaces are even and flat. After standing for 30 minutes, the polyester fiber felt airgel is formed. wet material. Soak the polyester fiber airgel wet material in methanol solution a...

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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...

Claims

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Application Information

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IPC IPC(8): C04B30/02
CPCC04B30/02C04B2111/27C04B2111/28C04B2111/76C04B2201/20C04B2201/32C04B16/0675C04B14/064
Inventor 曾宇婷田冠宇邓林曹勇
Owner GUIZHOU AEROSPACE WUJIANG MACHINERY & ELECTRICITYEQUIP
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