Method for preparing fiber base material and silicon dioxide aerogel composite heat insulating sleeve

A technology of fiber base material and silica, applied in the field of materials, can solve the problems of not much use, difficulty in making molding, insufficient mechanical strength of airgel, etc., and achieve the effect of reasonable design and simple operation

Active Publication Date: 2010-06-09
浙江鹏辰造纸研究所有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Silica nanoporous airgel has a high specific surface area and porosity, and is a light-weight and efficient thermal insulation material, but it is not used much in practice, mainly because the mechanical strength of the airgel is not enough, and it is difficult to form. Therefore, it hinders the widespread use of large areas or large areas
In order to solve this problem, someone tries to compound airgel with other materials (Chines

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Set the density to 90kg / m 3 1. A glass fiber mat with a thickness of 10mm is wound into a cylindrical shape of the required size. The glass fiber mat can be a single layer or multiple layers, and the seams are sewn with glass fiber threads to form a glass fiber mat reinforced substrate; The glass fiber mat reinforced base material is laid in the mold made of polytetrafluoroethylene by the cylindrical form of the outer mold and the inner mold; the volume ratio of methyl orthosilicate and water, ethanol, hydrochloric acid is 1: 10:1:0.1 mixing reaction, stirring for 1.5 hours to obtain wet gel; pour the wet gel into the sleeve mold that has evenly laid the glass fiber mat substrate in advance, so that the wet gel completely fills the entire mold and fully penetrates into the pores of the fiber mat base material, then sealed and aged for 3 days, demoulded, and then placed in an autoclave for drying and heat treatment. The autoclave was pre-filled with nitrogen to 1.0MPa, a...

Embodiment 2

[0027] Set the density to 85kg / m 3 , The polypropylene felt with a thickness of 20mm is wound into a cylindrical shape of the required size, and the seams are sewn with glass fiber threads to make the polypropylene felt reinforced substrate; E-40 is mixed with water, ethanol, and hydrofluoric acid at room temperature The mixing ratio is 1:15:0.8:0.05, and the wet gel is obtained after 1 hour; the wet gel is poured into the sleeve mold on which the polypropylene felt substrate has been uniformly laid in advance, and the mold is released after sealing and aging for 2 days. Carry out dry heat treatment in the autoclave, pre-fill nitrogen into the autoclave to 1.0MPa, program control temperature rise, after 1.5 hours to reach ethanol (critical point is 243.1 ℃, 6.296MPa, 0.276g / cm 3 ) after the critical point, keep it for 0.5 hours, then heat up and increase the pressure to 8Mpa, keep it for 1 hour and then slowly deflate, cool down and release the pressure to get a density of 175...

Embodiment 3

[0029]Roll the aluminum silicate fiber paper with a thickness of 0.2mm into a flute with a height of 3mm and a flute spacing of 5mm. Single layer can also be multi-layer), and the joint is bonded with water glass to make aluminum silicate paper honeycomb reinforced substrate; E-32 is mixed with water, ethanol, and sulfuric acid at a volume ratio of 1:3:0.5:0.02 at room temperature. The wet gel is obtained after 1 hour; pour the wet gel into the sleeve mold that has evenly laid the aluminum silicate paper honeycomb substrate in advance, so that the wet gel completely fills the entire mold and fills the holes of the paper honeycomb substrate, and then seals After aging for 2.5 days, demould, put into an autoclave for dry heat treatment, pre-fill nitrogen to 1.0MPa, program control temperature rise, reach ethanol after 1 hour (critical point is 243.1°C, 6.296MPa, 0.276g / cm 3 ) after the critical point, keep it for 0.5 hours, then heat up and increase the pressure to 9Mpa, keep it...

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Abstract

The invention discloses a method for preparing a fiber base material and silicon dioxide aerogel composite heat insulating sleeve, and belongs to the technical field of materials. The method comprises the following steps: preparing wet gel from polyethoxydisiloxanes, water, a solvent and a catalysts serving as raw materials; and pouring the wet gel into a sleeve die in which a fiber base materialis laid evenly in advance, ageing, putting into an autoclave for drying heat treatment, and reducing temperature and releasing pressure to obtain the fiber base material and silicon dioxide aerogel composite heat insulating sleeve. The method has the advantages of reasonable design and simple operation; the obtained composite heat insulating sleeve has the advantages that: 1, the minimum thickness of the wall of the sleeve is only 0.5mm, the pressive strength can reach over 1MPa, and special dimensions or other special products can be manufactured by a similar process; 2, the minimum density can reach 100kg/m3, and the minimum heat conductivity is only 0.015w/m.k; and 3, the sleeve can resist maximum temperature of 800 DEG C. The sleeve is particularly suitable for the field of aviation with special requirements on heat insulating properties.

Description

technical field [0001] The invention belongs to the field of material technology, and in particular relates to a preparation method of a fiber base material and silica airgel composite thermal insulation sleeve. Background technique [0002] Silica airgel is a porous material with high specific surface area and low density. Due to the existence of the nano-network structure, this material itself has special properties, and has broad application prospects in many fields such as optics, electricity, acoustics, environmental protection, metallurgy, etc. Hot science and technology. In view of the excellent material properties and broad application prospects of airgel, many people have carried out research on the preparation of this material. The preparation of silica aerogels generally uses organosilicon as a raw material, and is prepared by a sol-gel process combined with supercritical drying. Under the supercritical conditions of high temperature and high pressure, the liqu...

Claims

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Application Information

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IPC IPC(8): B29C39/10B29C39/44B29C71/02
Inventor 王虹倪星元汤人望张志华李荣年沈军周斌吴广明
Owner 浙江鹏辰造纸研究所有限公司
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