Recycled Polyamide Composition for Electronic Device Cases

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Solution Overview

Problem

The recycling of polyamide waste, such as marine plastic waste, often results in poor appearance and deteriorated physical properties in manufactured products due to thermal decomposition, hydrolysis, and ultraviolet exposure, leading to issues like gas generation and reduced tensile and impact strength.

Innovation Solution

A polymer composition comprising recycled polyamide, a new polyamide with a polyamide component, a glycidyl group-modified ethylene-octene-based copolymer, and an inorganic filler, which improves the mechanical properties and appearance by acting as a chain extender and stabilizer, reducing gas generation and enhancing thermal stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If recycled polyamide is used to recycle polyamide waste, then environmental impact is reduced, but physical properties such as tensile strength and impact strength deteriorate

Engineering Contradiction:

Improveenvironmental impactVSAvoidtensile strength and impact strength

Core Design Contradiction:

Object-affected harmful factorsVSStrength

Solution Approach 1:

The patent creates a composite material system by combining recycled polyamide with new polyamide and inorganic filler particles. This composite approach allows the recycled polyamide (which provides environmental benefits) to be reinforced by the inorganic filler, compensating for the strength losses from recycling while maintaining the sustainability advantage.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent modifies the physical and chemical parameters of the recycled polyamide by adding inorganic filler particles and new polyamide components. This changes the composite's overall properties, enhancing tensile strength and impact strength while preserving the recycled content's environmental benefits.

Inventive Principle:

Principle #35Parameter changes

2Object-affected harmful factors

If recycled polyamide is used to recycle polyamide waste, then environmental impact is reduced, but appearance quality deteriorates due to gas generation

Engineering Contradiction:

Improveenvironmental impactVSAvoidappearance quality

Core Design Contradiction:

Object-affected harmful factorsVSManufacturing precision

Solution Approach 1:

The inorganic filler acts as an intermediary component that interacts with the recycled polyamide matrix. It helps control gas generation during processing and improves the overall appearance quality of the finished product, while the recycled polyamide continues to provide the environmental benefit of waste reduction.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Loss of substance

If recycled polyamide is used to recycle polyamide waste, then material loss is reduced, but thermal stability deteriorates

Engineering Contradiction:

Improvematerial lossVSAvoidthermal stability

Core Design Contradiction:

Loss of substanceVSTemperature

Solution Approach 1:

The patent forms a composite material where recycled polyamide is combined with inorganic filler particles. This composite structure provides thermal stability that compensates for the thermal degradation experienced during recycling, while still maximizing the use of recycled material to minimize waste.

Inventive Principle:

Principle #40Composite materials

4Quantity of substance

If recycled polyamide is used to recycle polyamide waste, then resource consumption is reduced, but melt viscosity decreases leading to poor appearance

Engineering Contradiction:

Improveresource consumptionVSAvoidappearance quality

Core Design Contradiction:

Quantity of substanceVSManufacturing precision

Solution Approach 1:

The patent adjusts the rheological parameters of the recycled polyamide by incorporating inorganic filler and new polyamide components. This modification optimizes the melt viscosity for injection molding processes, preventing the poor appearance that would result from excessively low viscosity, while still utilizing recycled material to reduce resource consumption.

Inventive Principle:

Principle #35Parameter changes

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 polymer composition achieves improved tensile strength, impact resistance, and thermal stability, effectively recycling polyamide waste while maintaining product quality and reducing environmental impact.

Implementation Method 1

a glycidyl group-modified ethylene-octene-based copolymer, which improves the mechanical properties and appearance by acting as a chain extender and stabilizer

Methodology Applied

Scientific EffectChain extension:

Implementation Method 2

The cause of this deterioration may be that the molecular structure of the recycled polyamide has changed because of thermal decomposition by thermal cycling during product manufacturing

Methodology Applied

Scientific EffectThermal decomposition: Pyrolysis

Implementation Method 3

hydrolysis by moisture exposure after product manufacturing

Methodology Applied

Scientific EffectHydrolysis: Hydrolysis

Data Source

PatentUS20230250280A1Polymer compositions including recycled polyamide and electronic device and protective case for electronic device including the same

Publication Date: 2023.08.10 SAMSUNG ELECTRONICS CO LTD

AI summary

Polymer compositions include a recycled polyamide and an electronic device and a protective case for an electronic device including the same. The polymer composition according to various embodiments of the present disclosure may include a recycled polyamide, a new polyamide including at least one polyamide component, a glycidyl group-modified ethylene-octene-based copolymer, and an inorganic filler. In some embodiments, the recycled polyamide may include a polyamide collected from marine plastic waste.