Thermally Conductive Polyamide with Laser Direct Structuring Additives
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Solution Overview
Problem
There is a need for a thermally conductive polyamide compound that can undergo laser direct structuring to produce integrated circuit traces via direct metallization on the surfaces of polymer articles, while also maintaining thermal conductivity and avoiding the degradation of manufacturing equipment due to abrasive additives.
Innovation Solution
A thermally conductive polymer compound comprising 40-50% polyamide 6, 20-30% hexagonal boron nitride, 20-30% talc, 2-10% laser direct structuring additive, 10-20% glass fiber reinforcing agent, 0.2-2% calcium stearate lubricant, 0.1-0.4% phenolic anti-oxidant, and 0.1-0.4% tri-aryl phosphite processing stabilizer, which achieves in-plane thermal conductivity of more than 2.5 W/mK and supports laser direct structuring with a plating index greater than 0.7 and adhesion strength greater than 0.7 N/mm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If alumina is used as an additive to a thermoplastic polymer matrix to serve as the vehicle for dissipation of heat, then thermal conductivity is improved, but the internal surfaces of manufacturing equipment such as compounding extruders are degraded due to abrasion
Solution Approach 1:
The patent changes the material parameter from alumina to hexagonal boron nitride, which has superior thermal conductivity (2.0-5.0 W/mK vs. alumina's lower conductivity) and non-abrasive properties. This parameter substitution resolves the contradiction by maintaining thermal management functionality while eliminating equipment degradation.
Solution Approach 2:
The patent uses a composite material system combining hexagonal boron nitride with polyamide 6 matrix, creating a thermally conductive polymer composite that achieves both thermal conductivity enhancement and mechanical compatibility with manufacturing equipment, avoiding the abrasion issues of pure alumina fillers.
2Temperature
If a thermally conductive polymer compound is designed for heat dissipation, then thermal conductivity is improved, but the ability to undergo laser direct structuring for integrated circuit traces is lost
Solution Approach 1:
The patent applies local quality by incorporating laser direct structuring additives (metal powders or metal-containing compounds) as discrete phases within the thermally conductive polymer matrix. These additives are distributed throughout the material, enabling localized metallization and circuit trace formation through laser activation while the bulk material maintains its thermal conductivity properties.
Solution Approach 2:
The patent creates a multi-functional material that simultaneously provides thermal conductivity (via hexagonal boron nitride), structural integrity (via polyamide 6), and laser direct structuring capability (via metal-containing additives). This universal material serves multiple functions: heat dissipation, structural support, and electronic circuit integration, resolving the contradiction between thermal performance and manufacturing versatility.
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 compound effectively dissipates heat, supports efficient laser direct structuring for electronic circuitry, and enhances thermal conductivity by 17-36% compared to previous formulations, making it suitable for applications in electronic devices such as LED housings and personal computers.
Implementation Method 1
Thermally conductive polymer compounds also exist to dissipate heat by conduction. These compounds are formed into parts to serve as heat sinks, radiators, etc.
Implementation Method 2
integrated circuit traces via direct metallization can be made in the surfaces of the polymeric article of any shape, using a process called 'laser direct structuring'
Data Source
AI summary
A thermally conductive polyamide compound is disclosed. The compound comprises a polyamide matrix, boron nitride, and a laser direct structuring additive dispersed in the matrix. The compound can be extruded, molded, calendered, thermoformed, or 3D-printed into a heat dissipating and laser direct structured article.