Glass Wool Composition for Moisture-Resistant Vacuum Insulation
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Solution Overview
Problem
The thermal insulating properties of glass wool and vacuum insulation materials are adversely affected by moisture absorption, which has been largely ignored in previous studies, with the glass composition significantly influencing these properties rather than filament diameter or binder type.
Innovation Solution
A glass wool composition with specific ranges of SiO2, Al2O3, Na2O, K2O, MgO, CaO, and B2O3 is developed to reduce moisture absorption, including a high B2O3 content and balanced MgO and CaO levels to lower viscosity and prevent devitrification, while maintaining suitable thermal insulation properties and industrial production feasibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If glass wool is produced using conventional glass compositions (high alkaline metal content), then industrial production feasibility is improved, but moisture absorption increases
Solution Approach 1:
The patent applies parameter changes by modifying the glass composition parameters, specifically limiting Na2O to 8-15 wt% and K2O to 3-8 wt%, while adjusting other components like SiO2 (60-70 wt%), Al2O3 (1-5 wt%), and MgO (2-6 wt%) to achieve low moisture absorption while maintaining industrial producibility
Solution Approach 2:
The patent creates a composite glass composition that combines multiple oxide components in specific proportions, forming a new material system that balances moisture resistance with manufacturing feasibility, rather than using conventional single-composition approaches
2Reliability
If B2O3 content is increased to reduce moisture absorption, then thermal insulation performance is improved, but production complexity increases
Solution Approach 1:
The patent uses parameter changes by optimizing B2O3 content within a specific range (3-12 wt%) and coordinating it with other components to achieve the desired balance between moisture absorption, thermal insulation, and production feasibility without excessive complexity
3Stability of the object's composition
If MgO and CaO content is adjusted to prevent devitrification and control viscosity, then material stability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies parameter changes by specifying precise ranges for MgO (2-6 wt%) and CaO (3-8 wt%) content, along with their ratio, to control viscosity and prevent devitrification while maintaining reasonable manufacturing precision requirements
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 optimized glass wool composition achieves reduced moisture absorption, improved thermal insulation, and industrial production capabilities, ensuring effective thermal insulation performance while minimizing moisture-related degradation.
Implementation Method 1
the moisture absorption of glass wool per se has been virtually ignored
Implementation Method 2
the glass composition of glass wool is more significantly affected by moisture absorption than by such factors as filament diameter
Data Source
AI summary
A glass wool which has physical properties required for a heat insulation material, can be produced industrially, can have reduced hygroscopicity, and has a novel compounding composition. The glass wool having the following glass composition: SiO2: 60.0 to 65.0% by mass inclusive, Al2O3: 0.5 to 2.0% by mass inclusive, Na2O and K2O: 13.0 to 17.0% by mass inclusive, MgO and CaO: 8.0 to 12.0% by mass inclusive, B2O3: 5.0 to 12.0% by mass inclusive, and others: a remainder.