Biodegradable PCB Substrate Using PLA Fiberglass Composite
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Solution Overview
Problem
The rapid growth in electronic device production leads to significant environmental issues due to the disposal of obsolete printed circuit boards (PCBs) containing toxic materials, which are not biodegradable and pose long-term environmental pollution risks, necessitating the development of biodegradable alternatives that can be efficiently recycled.
Innovation Solution
A biodegradable composite material is created by thermal pressing multiple layers of fiberglass pre-impregnated with polylactic acid (L-PLA) or polyglycolic acid, combined with copper or aluminum foil, allowing for mechanical processing and chemical recycling, achieving properties comparable to commercial PCBs like FR2 and FR4.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional PCB materials (epoxy resins, phenolic resins) are used, then mechanical strength and electrical insulation are achieved, but environmental pollution and toxicity increase
Solution Approach 1:
The patent changes the chemical composition parameters by replacing traditional epoxy and phenolic resins with polylactic acid (PLA), a biodegradable polymer. This parameter change maintains the binder's functional properties while eliminating toxicity, as PLA decomposes into lactic acid which is naturally metabolized by microorganisms.
Solution Approach 2:
The patent creates a composite material combining polylactic acid with fiberglass and other fillers to achieve the mechanical strength of traditional PCBs. The composite structure allows the biodegradable polymer to provide insulation while the fiberglass reinforcement maintains structural integrity, resolving the contradiction between strength and environmental safety.
2Object-generated harmful factors
If biodegradable polymers are used instead of traditional resins, then environmental safety is improved, but manufacturing complexity and production scalability worsen
Solution Approach 1:
The patent optimizes the thermal processing parameters (temperature and time) to match conventional PCB manufacturing processes. By controlling the thermal pressing conditions within standard ranges, the patent enables biodegradable PCB production using existing equipment and workflows, thereby reducing manufacturing complexity.
Solution Approach 2:
The patent applies the biodegradable polymer binder specifically to the layers requiring insulation properties, while maintaining traditional fiberglass reinforcement in structural areas. This localized application strategy allows gradual adoption of eco-friendly materials without requiring complete process redesign, simplifying manufacturing implementation.
3Ease of repair
If biodegradable composite material is produced, then recyclability is improved, but mechanical processing difficulty increases
Solution Approach 1:
The patent adjusts the crystallinity and molecular weight parameters of the polylactic acid to optimize both recyclability and mechanical processing. By selecting specific PLA molecular weights and controlling crystallization during thermal pressing, the material achieves appropriate hardness for mechanical processing while maintaining biodegradability for recycling.
Solution Approach 2:
The patent creates a composite where the biodegradable polymer matrix is reinforced with fiberglass and inorganic fillers. This composite structure provides the mechanical strength needed for easy processing while the polymer matrix remains susceptible to biological degradation, enabling recyclability through composting or anaerobic digestion.
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 biodegradable composite material exhibits comparable mechanical and electrical properties to commercial PCBs, enabling efficient recycling and reuse of components, thus addressing environmental concerns and aligning with 'Green Chemistry' principles.
Implementation Method 1
A biodegradable composite material is created by thermal pressing multiple layers of fiberglass pre-impregnated with polylactic acid (L-PLA) or polyglycolic acid
Data Source
AI summary
The application describes a multilayer biodegradable electrically insulating composite material consisting of compressed layers of glass cloth or fiberglass pre-impregnated with a biodegradable polymer binder or alternately stacked layers of glass fiber and a polymer binder film. The developed material is close in its characteristics to the substrates of commercial printed circuit boards. Biodegradable electrically insulating composite material can be used as a substrate for creating single-sided or double-sided or multilayer printed circuit boards based on them, and can also be used to manufacture various electrical insulating materials and structures.