Double-Shell Fire-Extinguishing Microcapsule with Inorganic Nanoparticles
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Solution Overview
Problem
Fire-extinguishing microcapsules with polymer-based outer walls suffer from poor mechanical strength, significant loss of internal substances, and low thermal conductivity, which hinders rapid fire suppression and requires additional support materials, and struggle to operate effectively across varying ignition points and temperatures.
Innovation Solution
A fire-extinguishing microcapsule with a core of non-flammable material, a first shell layer of organic-inorganic composite containing inorganic nanoparticles and a water-soluble polymer, and a second shell layer of polymer-based material, allowing for enhanced mechanical stability and adjustable operating temperature range through the use of inorganic materials with varying thermal conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the outer wall is made of polymer-based materials (e.g., gelatin), then the microcapsule has good flexibility and ease of manufacture, but the mechanical strength is poor and additional support materials are required
Solution Approach 1:
The patent applies composite materials by combining polymer-based materials (gelatin, starch, or cellulose) with inorganic materials (calcium carbonate, calcium phosphate, or silica) to form a hybrid outer wall structure. This composite approach allows the microcapsule to maintain the flexibility and ease of manufacture of polymers while gaining the mechanical strength of inorganic materials, eliminating the need for additional support materials.
2Ease of manufacture
If the outer wall is made of polymer-based materials, then the microcapsule is easy to manufacture, but the thermal conductivity is poor which delays heat transfer during fire
Solution Approach 1:
The patent incorporates inorganic materials (calcium carbonate, calcium phosphate, or silica) into the polymer-based outer wall to create a composite structure with enhanced thermal conductivity. These inorganic components facilitate faster heat transfer during fire conditions while maintaining the ease of manufacture associated with polymer-based systems.
Solution Approach 2:
The patent optimizes the local composition of the outer wall by strategically distributing inorganic materials within the polymer matrix. This local quality enhancement ensures that thermal conductivity is improved in critical areas without compromising the overall ease of manufacture or requiring complete structural redesign.
3Adaptability or versatility
If the outer wall is made of polymer-based materials, then the microcapsule has good flexibility, but the mechanical stability is poor and additional support materials are needed
Solution Approach 1:
The patent creates a composite outer wall combining flexible polymer-based materials (gelatin, starch, or cellulose) with structurally robust inorganic materials (calcium carbonate, calcium phosphate, or silica). This composite structure maintains the flexibility needed for adaptability while providing the mechanical stability required for reliable operation, eliminating the need for additional support materials.
4Ease of manufacture
If traditional microcapsules with constant temperature release are used, then the manufacturing is simple, but the fire prevention effectiveness is reduced in environments with varying ignition points and temperatures
Solution Approach 1:
The patent modifies the local properties of the outer wall by incorporating inorganic materials with specific thermal properties that enable the microcapsule to respond to varying temperature conditions. This localized property adjustment allows the microcapsule to maintain effectiveness across different ignition points and temperature environments while preserving the simplicity of manufacture.
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 microcapsule achieves improved mechanical stability and rapid heat transfer, enabling effective fire suppression across different environments without the need for additional support materials, by utilizing a double-shell structure that enhances thermal conductivity and adjusts the operating temperature range.
Implementation Method 1
the thermal conductivity is poor. Such low thermal conductivity functions as a factor that delays heat transfer occurring in the event of a fire and hinders the rapid fire-extinguishing process
Implementation Method 2
a first shell layer covering the core and containing inorganic nanoparticles and a water-soluble polymer
Implementation Method 3
Microencapsulation is a technology in which liquid or solid substances inside are surrounded by organic or inorganic materials to prepare a type of capsule, which is used to selectively release substances inside or to protect internal substances from external environmental stimuli
Data Source
AI summary
The present invention relates to a fire-extinguishing microcapsule, a method for manufacturing same, and a fire-extinguishing composition comprising same. The microcapsule includes a core containing a non-inflammable material; a first shell layer covering the core and containing inorganic nanoparticles and a water-soluble polymer; and a second shell layer covering the first shell layer and containing a polymer.