Fiber-reinforced flexible SiO2 aerogel heat-insulation material and preparation method thereof

A fiber-reinforced and thermally insulating material technology is applied in the field of preparation of fiber-reinforced flexible SiO2 aerogel thermal insulating materials. The effect of poor strength, expanding the application range and shortening the preparation cycle

Active Publication Date: 2015-03-11
四川睿光科技有限责任公司
View PDF12 Cites 34 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently, SiO 2 The main problems faced by the industrialization of airgel include: low airgel strength, complicated preparation process, low preparation efficiency, large solvent consumption and high cost caused by supercritical drying, etc.
[0004] At present, in the prior art, SiO is mainly prepared through a composite process. 2 Composite airgel to solve the problems of low airgel strength and brittleness
For example: Chinese patent CN102701700A uses SiO 2 Composite preparation of airgel and fiber mat to prepare SiO 2 Composite airgel, but the physical properties of the product made by this method are poor. Although the mechanical strength has been improved, the flexibility of the composite airgel cannot be improved, and it is easy to cause the airgel substrate and reinforcing material to separate and fall off under bending The phenomenon; Chinese patent CN101973752A SiO 2 Combination of airgel and fiber to prepare fiber-reinforced SiO 2 Airgel, the composite airgel prepared by this method has a certain integrity, but the mechanical strength is low and the brittleness is large

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Add 90mL tetraethyl orthosilicate, 200mL ethanol, and 17mL water into the reaction vessel, then add 1.5mL of 0.5mol / L hydrochloric acid solution while stirring, the pH value of the solution is 4, stir and react at room temperature for 2h; then add while stirring 13.5mL of 1mol / L ammonia water and 120mL of absolute ethanol, the pH of the solution was 8, stirred vigorously for 3min, then poured the sol into the fiber felt pad, and kept it sealed for 2 days at 25°C to obtain fiber-reinforced SiO 2 Composite wet gel; fiber reinforced SiO 2The composite wet gel was soaked in a container containing a mixed solution of trimethylchlorosilane and absolute ethanol with a volume ratio of 1:10, sealed and soaked for 2 days at 25°C, and then soaked with ethanol to remove the residual fiber reinforcement. SiO 2 solution on the surface of the composite wet gel; fiber reinforced SiO 2 The composite wet gel is placed in absolute ethanol, and then dried by a rapid high-temperature grad...

Embodiment 2

[0026] Add 80mL of methyl orthosilicate, 200mL of ethanol, and 12mL of water into the reaction vessel, then add 1.8mL of 0.3mol / L hydrochloric acid solution while stirring, the pH value of the solution is 4, stir and react at room temperature for 2h; then add 18mL of 1.5mol / L ammonia water and 120mL of absolute ethanol, the pH value of the solution is 9, vigorously stirred for 3min, then the sol is poured into the fiber felt pad, at 25°C, kept in a closed place for 2 days to obtain fiber-reinforced SiO 2 Composite wet gel; fiber reinforced SiO 2 The composite wet gel was soaked in a container containing a mixed solution of trimethylchlorosilane and absolute ethanol with a volume ratio of 1:5, sealed and soaked at 25°C for 2 days, and then soaked with ethanol to remove the residual fiber reinforcement. SiO 2 solution on the surface of the composite wet gel; fiber reinforced SiO 2 The composite wet gel is placed in absolute ethanol, and then dried by a rapid high-temperature g...

Embodiment 3

[0028] Add 90mL tetraethyl orthosilicate, 100mL ethanol, and 30mL water into the reaction vessel, then add 2.5mL of 0.5mol / L hydrochloric acid solution while stirring, the pH value of the solution is 4, stir and react at room temperature for 2h; then add while stirring 7.2mL of 2mol / L ammonia water and 60mL of absolute ethanol, the pH value of the solution was 8, stirred vigorously for 3min, then poured the sol into the fiber felt pad, and kept it sealed for 2 days at 25°C to obtain fiber-reinforced SiO 2 Composite wet gel; fiber reinforced SiO 2 The composite wet gel was soaked in a container containing a mixed solution of trimethylchlorosilane and absolute ethanol with a volume ratio of 1:8, sealed and soaked at 25°C for 2 days, and then soaked with ethanol to remove the residual fiber reinforcement. SiO 2 solution on the surface of the composite wet gel; fiber reinforced SiO 2 The composite wet gel is placed in absolute ethanol, and then dried by a rapid high-temperature ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
densityaaaaaaaaaa
tensile strengthaaaaaaaaaa
diameteraaaaaaaaaa
Login to view more

Abstract

The invention discloses a fiber-reinforced flexible SiO2 aerogel heat-insulation material and a preparation method thereof. Silicon-containing substances such as tetraethyl orthosilicate, tetramethoxysilane, sodium silicate and the like are used as precursors, a fiber felt pad is used as a reinforcing body, fiber/SiO2 composite wet gel is prepared with a sol-gel technology, and the fiber-reinforced flexible SiO2 aerogel heat-insulation material is finally prepared through aging and supercritical drying. The synthesis process is simplified, the preparation cycle is shortened, the cost for synthesis of the SiO2 aerogel composite material is effectively reduced, defects of poor mechanical strength, large brittleness and the like of pure aerogel are overcome, the prepared composite aerogel keeps the excellent performance of the aerogel, the flexibility of the material is obviously improved, the material is better in integrity, capable of being bent at will and very good in heat-insulation effect, the heat conductivity of the material can be decreased to 19 mW/mK, the application range of the aerogel is enlarged, and the material can be applied to actual engineering as an independent bulk composite material.

Description

technical field [0001] The present invention relates to an airgel composite material, in particular to a fiber-reinforced flexible SiO 2 A method for preparing an airgel thermal insulation material. Background technique [0002] SiO 2 Airgel is a new type of lightweight nanoporous amorphous thermal insulation material. Its porosity is as high as 99%, the pore size is less than 100nm, the size of network colloid particles is 3-20nm, and the thermal conductivity can be as low as 13mW / mK. Due to SiO 2 Airgel has the characteristics of nano-network structure, large porosity, low thermal conductivity, strong moisture resistance and non-combustibility. SiO 2 Airgel thermal insulation materials are likely to become a new development direction of thermal insulation materials in the future, and may even completely replace various thermal insulation materials produced by existing high energy consumption. Currently, SiO 2 The main problems faced by the industrialization of airgel...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): C04B30/02
Inventor 张林任洪波罗炫毕玉铁
Owner 四川睿光科技有限责任公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap