Recycled Polycarbonate Housing Composition for Durable Electronics
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Solution Overview
Problem
Polycarbonate waste recycling results in appearance defects, reduced mechanical properties, and compromised waterproof performance due to molecular changes and thermal degradation, leading to inferior electronic device housings.
Innovation Solution
A polymer material comprising virgin polycarbonate, recycled polycarbonate, a phosphite-based additive, and an acrylic copolymer, along with an inorganic filler like glass fibers, is used to enhance durability and appearance, with a paint layer for protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If recycled polycarbonate is used to manufacture polymer products, then polymer waste is reduced and environmental sustainability is improved, but appearance defects occur and mechanical properties deteriorate due to molecular structure changes and thermal decomposition
Solution Approach 1:
The patent creates a composite material system comprising recycled polycarbonate (5-50 wt%), virgin polycarbonate (30-70 wt%), acrylic copolymer (5-20 wt%), and phosphite-based additive (0.1-1 wt%). This composite approach allows the recycled polymer to be combined with virgin polymer and functional additives to compensate for the degradation of recycled material, thereby maintaining appearance quality while achieving waste reduction goals
2Loss of substance
If recycled polycarbonate is used to manufacture polymer products, then polymer waste is reduced and environmental sustainability is improved, but tensile strength and impact strength deteriorate due to shortened polymer chains and increased terminal hydroxyl groups
Solution Approach 1:
The patent changes the compositional parameters by controlling the ratio of recycled to virgin polycarbonate (5:95 to 50:50 wt%), adjusting the acrylic copolymer content (5-20 wt%), and optimizing phosphite-based additive concentration (0.1-1 wt%). These parameter adjustments compensate for the molecular degradation in recycled polymer, maintaining mechanical strength while achieving waste reduction
3Loss of substance
If recycled polycarbonate is used to manufacture polymer products, then polymer waste is reduced and environmental sustainability is improved, but waterproof performance decreases due to cracks formed during painting and welding processes
Solution Approach 1:
The acrylic copolymer acts as an intermediary substance that modifies the interface between recycled polycarbonate and painting/welding processes. It improves adhesion and reduces crack formation during these subsequent processing steps, thereby maintaining waterproof performance while enabling the use of recycled polymer content
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 solution improves strength, impact resistance, surface quality, and chemical resistance, making the polymer suitable for electronic device housings while reducing plastic waste generation.
Implementation Method 1
degradation due to ultraviolet exposure and hydrolysis caused by moisture exposure after manufacturing, and degradation due to ultraviolet exposure
Implementation Method 2
hydrolysis caused by moisture exposure after manufacturing
Implementation Method 3
cracks formed during a painting process or a welding process
Implementation Method 4
an exterior case including a polymer material
Data Source
AI summary
An electronic device according to an embodiment of the present invention includes a display and a housing, where the housing includes: an outer frame which includes a polymer material, which forms at least a part of the outer surface of the housing, and which is positioned to protect at least a part of the outer perimeter of the display; and an inner bracket which includes a metal material, which is coupled to the outer frame, and on which the display and the inner constituent elements of the electronic device are mounted. The polymer material includes a new polycarbonate polymer, a recycled polycarbonate polymer, a phosphite-based additive and an acrylic copolymer.