PHB-Date Palm Fiber Insulation Composite With Lower Material Cost
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Solution Overview
Problem
Current insulation materials are costly and environmentally harmful due to their reliance on non-renewable resources, and biodegradable alternatives like poly-β-hydroxybutyrate (PHB) are too expensive for widespread commercialization.
Innovation Solution
A method involving the production of silylated date palm fibers by immersing powdered date palm fibers in a silane-grafting solution, followed by melt extrusion with poly(β-hydroxybutyrate) pellets, and hot-pressing to create a biodegradable thermal insulation composite.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pure poly(β-hydroxybutyrate) is used for insulation material, then biodegradability and biocompatibility are improved, but manufacturing cost increases significantly
Solution Approach 1:
The patent creates a composite material combining PHB with silylated natural fibers (date palm, jute, or hemp). The fiber reinforcement allows reduction of PHB content while maintaining structural integrity and biodegradability. The silane treatment on fibers improves interfacial bonding with PHB matrix, ensuring composite performance.
Solution Approach 2:
The patent modifies the chemical parameters of natural fibers through silane grafting treatment. The silane coupling agents (such as γ-aminopropyltriethoxysilane) are grafted onto fiber surfaces, changing their chemical properties to improve compatibility with PHB and reduce overall material cost while preserving biodegradability.
2Ease of manufacture
If natural fibers are used as reinforcement, then material cost is reduced, but interfacial bonding with PHB matrix deteriorates
Solution Approach 1:
The patent introduces silane coupling agents as intermediary substances between the natural fibers and PHB matrix. These silanes form a bridging layer that chemically bonds to both the fiber surface and the PHB polymer, significantly improving interfacial adhesion and stress transfer while allowing use of low-cost natural fibers.
Solution Approach 2:
The patent changes the surface chemical parameters of natural fibers through silane grafting. The treatment modifies fiber surface energy, chemistry, and morphology, creating sites for better PHB adhesion. This parameter modification enables strong bonding between inexpensive natural fibers and the biodegradable polymer matrix.
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 reduces the cost of biodegradable insulation by minimizing PHB usage while maintaining desirable properties, achieving thermal conductivity and tensile strength comparable to conventional materials, with reduced water absorption.
Implementation Method 1
The silane-grafting solution may be produced by hydrolyzing an about 2 wt % solution of 3-aminopropyl triethoxysilane with ethanol solution (as the grafting solution) to produce the silane-grafting solution.
Implementation Method 2
The biodegradable thermal insulation composite may then be hot-pressed in a mold and may be further annealed.
Data Source
AI summary
A method of making a biodegradable thermal insulation composite based on poly(β-hydroxybutyrate) includes immersing powdered date palm fibers in a silane-grafting solution to produce silylated date palm fibers. The silylated date palm fibers are then suction filtered, washed with deionized water, and dried. The silylated date palm fibers are then melt extruded with poly(β-hydroxybutyrate) pellets to produce the biodegradable thermal insulation composite. The biodegradable thermal insulation composite may then be hot-pressed in a mold and may be further annealed. Alternatively, polylactic acid or poly(β-hydroxybutyrate) is dissolved in chloroform to form a solution. The solution is heated and poured on a volume of powdered date palm fibers such that a surface thereof is completely covered with the solution. The covered date palm fibers are then melt extruded with poly(β-hydroxybutyrate) pellets to produce the biodegradable thermal insulation composite, followed by hot-pressing in a mold and annealing.