Polyamide Resin Composition for Mobile Telephone Housings
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Solution Overview
Problem
Mobile telephone housings require materials with high stiffness and low moisture absorption to maintain structural integrity and electromagnetic signal transparency, but existing polyamide compositions often fail to meet these criteria due to significant moisture absorption, which affects signal strength and power consumption.
Innovation Solution
A polyamide composition comprising 20-70 weight percent of aliphatic and semiaromatic polyamides with reinforcing agents and impact modifiers, resulting in a tensile modulus greater than 12 GPa and moisture absorption of less than 0.4 weight percent, ensuring excellent stiffness and low moisture absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If thermoplastic polyamide compositions are used for mobile telephone housings, then good physical properties and moldability are achieved, but significant moisture absorption occurs which decreases transparency to electromagnetic radiation
Solution Approach 1:
The patent uses a composite material system consisting of polyamide resin combined with reinforcing agents (such as glass fibers, carbon fibers, or metal fibers) and impact modifiers. This composite structure maintains the moldability of thermoplastic polyamides while the reinforcing agents provide structural integrity and the impact modifiers reduce moisture absorption, achieving both ease of manufacture and resistance to moisture absorption.
2Strength
If polyamide compositions with good mechanical properties are used, then structural support and impact resistance are achieved, but moisture absorption increases which affects electromagnetic signal transmission
Solution Approach 1:
The patent modifies the chemical and physical parameters of the polyamide composition by selecting specific resin types (such as polyamide 6, polyamide 12, or their copolymers) and controlling their molecular weight, crystallinity, and composition. By adjusting these parameters and combining them with reinforcing agents and impact modifiers, the material achieves high impact resistance while minimizing moisture absorption through optimized compositional parameters.
3Object-affected harmful factors
If polyamide 12 is used, then good resistance to moisture absorption is achieved, but insufficient stiffness for mobile telephone housing applications
Solution Approach 1:
The patent combines polyamide 12 with reinforcing agents such as glass fibers, carbon fibers, or metal fibers to create a composite material that maintains the low moisture absorption properties of polyamide 12 while significantly enhancing its stiffness and structural strength. The reinforcing agents provide the necessary mechanical rigidity for telephone housing applications without compromising the inherent moisture resistance of the polyamide 12 base material.
Data Source
AI summary
A mobile telephone housing comprising a polyamide composition having excellent stiffness and low moisture absorption.