Thermally Conductive Plastic Using Coarse Island Silicates
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Solution Overview
Problem
Plastics have low thermal conductivity, making them inadequate for applications requiring efficient heat transfer, and existing filler materials often compromise mechanical properties and are costly.
Innovation Solution
A thermally conductive composition comprising 20-80% by weight of island silicates or metallic silicon, preferably aluminosilicates like disthene, mixed with plastics to enhance thermal conductivity while maintaining mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional fillers (e.g., boron nitride) are used to increase thermal conductivity, then thermal conductivity is improved, but mechanical properties deteriorate and cost increases
Solution Approach 1:
The patent changes the key parameter of filler particle size to coarse grains (0.1-5 mm, preferably 0.5-2 mm), which is significantly larger than conventional fillers. This parameter change allows achieving high thermal conductivity (1.5-3.0 W/mK) while maintaining mechanical properties, as the larger particles create fewer interference points for stress distribution compared to fine particles
Solution Approach 2:
The patent creates a composite material system combining plastic matrix with coarse island silicate or metallic silicon particles. This composite structure achieves synergistic effects where the coarse filler particles provide thermal conductivity pathways while the plastic matrix maintains mechanical integrity, resulting in thermal conductivity of 1.5-3.0 W/mK with retained mechanical strength
2Temperature
If filler content is increased to improve thermal conductivity, then thermal conductivity is improved, but processing difficulty increases
Solution Approach 1:
The patent changes the particle size parameter to coarse grains (0.1-5 mm) which flow and distribute more easily in the plastic matrix during processing. This parameter change reduces processing difficulty despite high filler content (30-80 wt%), as larger particles experience less agglomeration and require less intensive mixing compared to fine particles
3Strength
If fine fillers are used to improve mechanical properties, then mechanical strength is improved, but thermal conductivity is reduced
Solution Approach 1:
The patent inverts the conventional particle size approach by using coarse particles (0.1-5 mm) instead of fine particles. This parameter change achieves the counterintuitive result of high thermal conductivity (1.5-3.0 W/mK) while maintaining adequate mechanical properties, as the coarse particles create more efficient thermal pathways with fewer inter-particle boundaries that would impede heat flow
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 composition achieves significantly improved thermal conductivity and retains good mechanical properties, with high filler content and coarser particles providing better performance than comparison materials, and finer fillers enhancing mechanical strength.
Implementation Method 1
Boron nitrides, for example, are used to influence the thermal conductivity and can more than double the thermal conductivity when the plastic is filled... the composition achieves significantly improved thermal conductivity
Data Source
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AI summary
Disclosed is a composition containing a plastic and 20 to 80 wt% of an additive selected from among orthosilicates, metal silicon, and mixtures thereof.