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Nano-porous aerogel/fiber composite super thermal insulation material and preparation method thereof

A fiber composite and thermal insulation material technology is applied in the preparation of the composite thermal insulation material and in the field of composite super thermal insulation materials, which can solve the problems of not being able to form nano-scale or micro-scale pore structures, difficult to achieve super thermal insulation effects, and limiting the application range of thermal insulation materials. , to achieve the effects of excellent thermal insulation properties, excellent thermal shock resistance, and improved operating temperature and service life

Active Publication Date: 2013-12-25
JIANGSU ZHONGLEI ENERGY SAVING TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, fibrous thermal insulation materials cannot form nano-scale or micro-scale pore structures, and it is difficult to achieve super thermal insulation effect
[0005] Therefore, whether it is airgel or fibrous insulation materials, there are limitations in use, which limits the expansion of the application range of insulation materials; and the simple mixing of airgel and fibrous insulation materials cannot achieve Uniform and extremely high porosity, as well as relatively high bond strength and overall strength between the two

Method used

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  • Nano-porous aerogel/fiber composite super thermal insulation material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0042] (1) The organic solvent tert-butanol, organic monomer acrylamide, cross-linking agent N,N'-methylene bisacrylamide are fully stirred and mixed for 25 hours to prepare a premixed liquid, in which tert-butanol, acrylamide and N, N'-methylenebisacrylamide, the weight ratio of the three is 180:37:3.5; (2) Add silica aerogel, alumina micropowder, zirconia fiber, and zirconia fiber to the premix in step (1) Sunscreen titanium dioxide, pore-forming agent polyethylene glycol-2000 and suspending agent sodium tripolyphosphate, planetary ball milling mixture for 5 hours, prepare a slurry with a solid content (volume fraction) of 19%, in which silicon oxide vaporizes Glue, alumina powder, zirconia fiber, and sunscreen titanium dioxide, the weight ratio of the four is 0.7:2.3:1.4:0.08, and the addition amount of pore-forming agent polyethylene glycol-2000 is silica aerogel and alumina 2.7% of the total weight of micropowder, zirconia fiber and sunscreen titanium dioxide, the addition...

Embodiment approach 2

[0044] (1) The organic solvent tert-butanol, organic monomer acrylamide, cross-linking agent N,N'-methylene bisacrylamide are fully stirred and mixed for 25 hours to prepare a premixed liquid, in which tert-butanol, acrylamide and N, N'-methylenebisacrylamide, the weight ratio of the three is 175:32:2; (2) Add silica aerogel, alumina micropowder, zirconia fiber, and zirconia fiber to the premix in step (1) Sunscreen titanium dioxide, pore-forming agent polyethylene glycol-2000 and suspending agent sodium tripolyphosphate, mixed with planetary ball milling for 4 hours to prepare a slurry with a solid content (volume fraction) of 21%, in which silicon oxide vaporizes Glue, alumina micropowder, zirconia fiber, sunscreen titanium dioxide, the weight ratio of the four is 1.1~1.3:2.8:3~3.3:0.14, the addition amount of pore-forming agent polyethylene glycol-2000 is silica vapor 1.5~4.5% of the total weight of rubber, alumina micropowder, zirconia fiber and sunscreen titanium dioxide, ...

Embodiment approach 3

[0046] (1) Stir and mix the organic solvent tert-butanol, organic monomer acrylamide, and crosslinking agent N,N'-methylene bisacrylamide for 24 to 48 hours to prepare a premixed solution, in which tert-butanol, acrylamide and N,N'-methylenebisacrylamide, the weight ratio of the three is 174:39~40:6~9; (2) Add silica aerogel and alumina to the premix in step (1) Micropowder, zirconia fiber, sunscreen titanium dioxide, pore-forming agent polyethylene glycol-2000 and suspending agent sodium tripolyphosphate, planetary ball milling mixture for 4.5 hours to prepare a slurry with a solid content (volume fraction) of 35% , Wherein the weight ratio of silica aerogel, alumina micropowder, zirconia fiber, and sunscreen titanium dioxide is 0.7~1.0:2.5~4.0:1.8~3.1:0.12~0.23, the pore former is polyethylene glycol The addition of -2000 is 4.6% of the total weight of silica aerogel, alumina micropowder, zirconia fiber and sunscreen titanium dioxide, and the addition of suspending agent sodi...

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Abstract

The invention discloses a nano-porous aerogel / fiber composite super thermal insulation material and a preparation method thereof. The aerogel / fiber composite super thermal insulation material comprises silicon dioxide aerogel, alumina micro powder, zirconium oxide fibers and opacifying agent of titanium dioxide. The preparation method comprises that organic solvent, cross-linking agents and organic monomers make up pre-mixed solution according to a certain proportion, the silicon dioxide aerogel, the alumina micro powder, the zirconium oxide fibers, pore-forming agents, suspending agents and the titanium dioxide make up slurry through a ball milling process according to a certain proportion, then a certain amount of initiating agents and a certain amount of catalytic agents are dropwise added into the slurry through vacuum bubble removal, composite material in-situ solidification is achieved through a gel injection moulding process, and then demoulding, vacuum drying and degreasing glue discharging are conducted. The nano-porous aerogel / fiber composite super thermal insulation material has a nano-porous / reinforced fiber composite microstructure, the heat conductivity is 0.040-0.046W*m<-1>*K<-1> (298K), and the flexure strength is as high as 12-14MPa. Preparation processes are simple, industrialized application is easily achieved on a large scale, and the nano-porous aerogel / fiber composite super thermal insulation material is suitable for thermal protection of aerospace, military affairs and severe rugged environments.

Description

Technical field [0001] The invention relates to a high-temperature thermal insulation material, in particular to a composite super thermal insulation material containing nanoporous aerogel and fibrous thermal insulation material. The invention also relates to a preparation method of the composite thermal insulation material. Background technique [0002] Super thermal insulation materials refer to thermal insulation materials whose thermal conductivity is lower than the thermal conductivity of "no convection air" (0.026W / m·k, 25°C) under predetermined conditions of use. Aerogel is a typical nanoporous super thermal insulation material, which includes silicon, carbon, sulfur, metal oxide and metal, etc.; aerogel has a very high porosity, very low density, high ratio Surface area, ultra-high pore volume rate. [0003] SiO 2 Aerogel is considered to be the solid material with the best thermal insulation performance at present. It is a lightweight nanoporous material with a spatial n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B30/02
Inventor 徐广平宋扬何江荣何洁刘鹏程宋一华徐溶
Owner JIANGSU ZHONGLEI ENERGY SAVING TECH DEV CO LTD
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