Aerogel Heat-Insulating Sheet With Fiber Substrate
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Solution Overview
Problem
Existing aerogel composites are fragile, thick, and difficult to produce in thin, uniform sheets due to issues like rupture and incomplete sol infiltration, limiting their application in confined spaces.
Innovation Solution
A method involving stacking fiber sheets in a sol, gelling, aging, and supercritical drying to create thin aerogel sheets with a thickness of 0.3-5 mm and 30-40% aerogel content, using a fixture to maintain structural integrity and grids for uniform thickness, preventing rupture and ensuring complete sol absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fiber substrates are used for aerogel compositing, then thermal insulation performance is improved, but structural strength deteriorates causing rupture and incomplete infiltration
Solution Approach 1:
The patent uses composite materials by combining fiber substrates with aerogel particles to create an aerogel composite material that maintains the thermal insulation benefits of aerogel while the fiber substrate provides structural support. This composite structure resolves the contradiction between achieving high thermal insulation performance and maintaining structural strength during processing.
2Strength
If aerogel composites are produced with sufficient thickness for strength, then structural integrity is improved, but thickness increases making them unsuitable for confined spaces
Solution Approach 1:
The patent employs thin film technology by creating a thin fiber substrate that can be fully infiltrated with aerogel sol. The fiber substrate acts as a flexible thin film structure that provides sufficient structural integrity even at reduced thickness, enabling the aerogel composite to be suitable for confined spaces while maintaining structural strength.
3Length of stationary object
If thin fiber substrates are used to reduce thickness, then portability is improved, but manufacturing precision deteriorates due to rupture and inconsistent gel amount
Solution Approach 1:
The patent applies self-service principle through the porous structure of the fiber substrate that automatically absorbs and retains aerogel sol through capillary action during immersion. This self-absorption mechanism ensures consistent gel amount distribution throughout the thin substrate without requiring complex external control systems, thereby improving manufacturing precision while maintaining thin dimensions.
4Weight of moving object
If thin fiber substrates are used to enhance portability, then weight is reduced, but reliability deteriorates due to rupture during production
Solution Approach 1:
The patent uses flexible thin film structures where the fiber substrate is designed with appropriate flexibility to withstand processing operations without rupture. The thin fiber substrate maintains sufficient mechanical reliability during production while achieving reduced weight for enhanced portability of the final aerogel composite product.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method produces thin, high-strength aerogel sheets with reduced thermal conductivity, enhancing portability and applicability in confined spaces by increasing sol absorption and preventing product damage during production.
Implementation Method 1
the fiber substrates often experience issues such as rupture, incomplete infiltration
Implementation Method 2
performing hydrolysis and polycondensation reactions at 20 °C to 80°C
Implementation Method 3
performing hydrolysis and polycondensation reactions at 20 °C to 80°C
Implementation Method 4
subjecting the wet gel fiber sheets to supercritical drying to obtain aerogel sheets
Data Source
Figure 1
Figure 2~3
AI summary
The present application belongs to the technical field of functional materials, and discloses an aerogel heat-insulating sheet, a preparation method and use thereof. The aerogel heat-insulating sheet is prepared by: completely immersing a plurality of fiber sheets stacked to a total thickness of 20 mm to 30 mm in a sol, and subjecting the soaked fiber sheets to a gelling treatment at a temperature of 20 °C to 80 °C; stacking a plurality of groups of the gelled fiber sheets separated by grids to a total thickness of 400 mm to 600 mm, where each group has a thickness of 20 nm to 30 nm, fixing the stack in a mold, and placing the mold in a mold barrel containing an ethanol solution and aging at a temperature of 25 °C to 40 °C to obtain wet gel fiber sheets; subjecting the wet gel fiber sheets to supercritical drying to obtain aerogel sheets, and performing post-treatments including gel scraping and dust removal. The thickness of the aerogel heat-insulating sheet is in a range from 0.3 mm to 5 mm, and the aerogel content of the aerogel heat-insulating is in a range from 30% to 40%, thereby reducing the thermal conductivity of the product. The aerogel heat-insulating sheet can be used in a field of new energy power batteries, energy storage batteries, household appliances, or electronic devices.