Depolymerized Cellulosic Insulation with Embedded Fire Retardants
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Solution Overview
Problem
Current cellulosic materials used for building insulation face limitations due to supply constraints and inadequate integration of fire retardants, which affect their thermal and acoustic insulating properties.
Innovation Solution
A composite building material is developed by delignifying cellulosic materials to create pores, which are then filled or capped with fire retardants, enhancing thermal and acoustic insulation. The material is derived from natural fibers like hemp, jute, and bamboo, and treated to maintain cellulose crystal structure and increase porosity, with fire retardants like borate derivatives and magnesium oxides added to improve fire resistivity and insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fire retardants are added to cellulosic materials using conventional methods, then flame resistivity is improved, but physical integration between fire retardants and cellulosic materials is insufficient
Solution Approach 1:
The patent utilizes the natural porous structure of cellulosic materials to embed fire retardants within the pores, achieving strong physical integration through capillary action and surface adhesion. This ensures fire retardants remain firmly attached during handling and installation while maintaining effective flame resistivity.
Solution Approach 2:
The patent employs binding agents or adhesives as intermediaries to enhance the physical integration between fire retardants and cellulosic materials. These intermediaries facilitate strong adhesion and uniform distribution, ensuring fire retardants remain firmly attached without compromising flame resistivity.
2Ease of manufacture
If recycled cellulosic materials are used for building insulation, then cost is reduced, but supply becomes limited due to environmental awareness and electronic communication dependency
Solution Approach 1:
The patent promotes the use of agricultural residues and natural fibers as alternative cellulosic materials that can serve multiple purposes: providing insulation, utilizing readily available supplies from agricultural activities, and maintaining cost-effectiveness. This multi-functional approach addresses supply limitations while preserving economic benefits.
Solution Approach 2:
The patent shifts the source of cellulosic materials from recycled post-consumer waste to pre-consumer agricultural residues and natural fibers, changing the supply parameters while maintaining the desired properties for insulation and cost-effectiveness.
3Reliability
If cellulosic materials are broken down into small pieces for effective filling, then insulation performance is improved, but physical integration with fire retardants deteriorates
Solution Approach 1:
The patent leverages the porous structure of small cellulosic pieces to embed fire retardants within the pores through capillary action. This ensures that even when materials are broken down into small pieces for effective filling, fire retardants remain firmly integrated through pore-based adhesion rather than surface-only attachment.
Solution Approach 2:
The patent utilizes liquid binding agents or adhesives that flow into the pores of small cellulosic pieces through capillary action, ensuring uniform distribution and strong physical integration of fire retardants throughout the material matrix, even when broken down into small fragments.
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 treated composite material achieves improved thermal resistivity (R-value) and acoustic insulation, with increased fire resistivity and reduced fungal and bacterial infestation, while maintaining a high degree of cellulose crystal structure and porosity, leading to enhanced insulation performance.
Implementation Method 1
chemically treating the cellulosic materials to remove at least a portion of non-cellulosic materials (e.g., lignin and hemicellulose) from the cellulosic materials, thereby creating one or more pores within the matrix of the cellulosic materials
Implementation Method 2
creating one or more pores within the matrix of the cellulosic materials. The one or more pores may be filled or capped with fire retardants to improve thermal and acoustic insulating properties
Implementation Method 3
enhancing thermal and acoustic insulation... improved thermal resistivity (R-value)... leading to enhanced insulation performance
Implementation Method 4
enhancing thermal and acoustic insulation... improved acoustic insulation
Data Source
AI summary
The present invention relates to the creation of thermally insulating materials derived from cellulosic materials by selectively depolymerizing the materials anatomy. Cellulosic materials may be comprised of three main biopolymers: lignin, hemicellulose, and cellulose. The present invention relates to the chemical and physical removal of lignin and hemicellulose, while leaving the cellulose unaltered to induce increased porosity within the material and the material’s macrostructure matrix for use as thermal and acoustic insulation. The increased porosity will be due to the creation of closed cell voids within the cellulosic matrix. These voids will increase the thermal and acoustic insulating performance of the cellulosic materials. The selective removal of secondary biopolymers from cellulosic materials allow for isolation of other value added products that can be regenerated through fewer reactions/steps. This is a novel advantage over other similar processes that dissolve cellulose completely, making it harder to extract and isolate secondary off-stream products.