Polymer Composition for Antenna Housings With Flow and Cold Impact
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Solution Overview
Problem
Current polymer compositions for antenna housings lack sufficient spiral flow performance and low-temperature falling weight impact resistance, which are crucial for withstanding extreme weather conditions such as gales and hail.
Innovation Solution
A polymer composition comprising polypropylene, an ethylene-based elastomer, grafted polypropylene, and glass fibers, with specific ranges for melt flow index and weight percentages, optimized for injection molding and enhanced mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the polymer composition uses conventional polypropylene with high stiffness, then the structural strength is improved, but the spiral flow performance deteriorates
Solution Approach 1:
The patent applies parameter changes by carefully controlling the melt flow index of polypropylene within a specific range (17-68 dg/min) and optimizing the composition ratios of multiple components including polypropylene (40-70 wt%), ethylene-based elastomer (15.5-28.3 wt%), grafted polypropylene (1.2-2.9 wt%), and glass fiber (20-40 wt%). These parameter optimizations resolve the contradiction by achieving both adequate structural strength and excellent spiral flow performance.
2Strength
If the polymer composition uses conventional polypropylene with high stiffness, then the structural strength is improved, but the falling weight impact resistance at low temperature deteriorates
Solution Approach 1:
The patent employs composite materials by combining polypropylene with ethylene-based elastomer (providing low-temperature impact resistance), grafted polypropylene (improving interfacial adhesion), and glass fiber (enhancing structural strength). This multi-component composite system resolves the contradiction by achieving both structural strength and falling weight impact resistance at low temperature through synergistic effects of different materials.
Data Source
AI summary
The present invention relates to a polymer composition comprising a polypropylene, an ethylene based elastomer, a grafted polypropylene and glass fiber. The polymer composition according to the present invention has improved flowability and falling weight impact resistance at low temperature.