Exfoliated Graphite PLA Foam Thermal Insulation
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Solution Overview
Problem
Existing expandable polystyrene (EPS) foams struggle to achieve a low thermal conduction coefficient for effective thermal insulation, and current methods require higher amounts of thermal insulation materials, which can affect the foam's color and performance.
Innovation Solution
Incorporating exfoliated graphite with a particle size of 0.1-0.8 µm into polylactic acid (PLA) expandable polymers, which are processed with a blowing agent and additional components, to enhance thermal insulation without discolouring the foam.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If traditional thermal insulation materials (graphite, active carbon) are added to EPS, then thermal insulation value is improved, but foam color is affected and higher amounts are required
Solution Approach 1:
The patent changes the particle size parameter of graphite from conventional larger sizes to a specific range of 0.1-0.8 μm. This parameter change allows achieving superior thermal insulation performance while maintaining foam color and mechanical properties, resolving the contradiction between thermal insulation improvement and manufacturing quality preservation
Solution Approach 2:
The patent creates a composite material system combining polylactic acid (PLA) with specifically sized graphite particles. This composite approach enables optimized thermal insulation performance while maintaining color and mechanical properties that would be compromised by traditional graphite additions
2Temperature
If higher amounts of thermal insulation materials are used, then thermal insulation value improves, but foam mechanical properties and color are compromised
Solution Approach 1:
By optimizing the particle size parameter to 0.1-0.8 μm, the patent achieves enhanced thermal insulation with minimal impact on mechanical properties. The specific particle size range allows for effective thermal blocking while maintaining structural integrity, avoiding the need for excessive material addition
3Ease of manufacture
If conventional graphite particle sizes are used, then manufacturing is simpler, but thermal insulation performance is insufficient
Solution Approach 1:
The patent specifies a precise particle size range of 0.1-0.8 μm for graphite, which balances manufacturing feasibility with superior thermal insulation performance. This parameter specification enables effective thermal blocking while remaining compatible with standard manufacturing processes
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 use of exfoliated graphite in PLA expandable polymers results in a foam with improved thermal insulation properties and meets stringent fire-resistance requirements while maintaining a desirable color and mechanical properties.
Implementation Method 1
aluminium particles, which are mainly in the form of platelets... incorporated as a material that reflects infrared radiation
Implementation Method 2
an amount of steam is passed through a layer of EPS granules in an expansion vessel, as a result of which the blowing agent present in the EPS granules, usually pentane, is evaporated and foaming of the granules takes place
Implementation Method 3
the granules are further expanded under the influence of steam
Data Source
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AI summary
The present invention relates to particulate, expandable polymer which can be processed into a foam having a fine cell structure and a low density and which, in order to improve the thermal insulation value thereof, contains a carbon-based thermal insulation value-increasing material. The present invention further relates to a method for preparing particulate, expandable polymer as well as to a foam material obtained therewith.