Halogen-Free Polymer Composition for Cable Conjunctions
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Solution Overview
Problem
Conjunction devices face challenges in meeting industrial requirements for flame retardance, mechanical protection, flexibility, and dimensional stability due to the interdependence of polymer composition properties, where improving one property often deteriorates others, and existing compositions fail to balance these criteria effectively.
Innovation Solution
A halogen-free polymer composition comprising 24-32 wt.% of linear very low density polyethylene, 8-16 wt.% of ultra-low density random ethylene-octene copolymer, and 56-65 wt.% of hydrated metal-based flame retardant filler, optimized for extrusion and meeting stringent standards through a specific combination and range of components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high levels of flame retardant filler are used to achieve flame retardancy, then flame retardance is improved, but mechanical properties such as elongation and flexibility deteriorate
Solution Approach 1:
The patent uses a composite polymer composition consisting of VLDPE, POE, and NBR in specific proportions (VLDPE: 60-80 wt%, POE: 10-30 wt%, NBR: 5-15 wt%) to create a balanced material that achieves both flame retardance through filler incorporation and maintained mechanical properties through the synergistic composite structure
Solution Approach 2:
The patent optimizes the proportions of each polymer component within specific ranges to balance flame retardance and mechanical properties. By adjusting the parameters of polymer composition and filler content, the material achieves elongation of 300-500% while maintaining flame retardant characteristics
2Stability of the object's composition
If polyethylene and polyolefin elastomers are used to achieve high elongation at break, then flexibility is improved, but flame retardance deteriorates
Solution Approach 1:
The patent combines multiple polymer types (VLDPE, POE, and NBR) with complementary properties into a single composite system. VLDPE provides baseline elongation, POE enhances flexibility and elongation, while NBR contributes to both mechanical properties and flame retardance, achieving synergistic effects that satisfy both requirements simultaneously
3Ease of manufacture
If the polymer composition is changed to improve one property, then that property is improved, but other properties deteriorate
Solution Approach 1:
The patent defines specific parameter ranges for each component (VLDPE: 60-80 wt%, POE: 10-30 wt%, NBR: 5-15 wt%) that optimize both processing characteristics and final product performance. This parameter optimization ensures good processability during extrusion while meeting all industrial requirements for flame retardance, mechanical properties, and flexibility
Data Source
AI summary
The invention relates to conjunction devices and polymer compositions used for preparing the conjunction devices. The conjunction devices comprise one or more elements including a static/moving current medium or communication medium; and a halogen-free polymer composition surrounding the element(s). The polymer composition includes a linear very low density polyethylene (VLDPE) composition and one or more polyolefin-elastomers. In addition, the polymer composition includes a flame retardant filler.