Strand-shaped elements and polymer composition for preparing same
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Solution Overview
Problem
Developing strand-shaped elements that balance flame retardancy, mechanical stability, high elongation at break, and flexibility while meeting industrial standards is challenging due to the unpredictable effects of changing polymer compositions, which often result in deterioration of multiple properties simultaneously.
Innovation Solution
A polymer composition comprising 24-32 wt.% of a mixture of two linear very low density polyethylenes, 10-17 wt.% of an ultra-low density random ethylene-octene copolymer, a mineral hydroxide/hydrated metal-based flame retardant filler, 0.1-3.0 wt.% antioxidant, and 0.5-2.5 wt.% coupling agent, optimized for extrusion to achieve specific ranges of elongation at break and strength at break, ensuring compliance with industrial standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If flame retardant filler content is increased to improve flame retardancy, then flame retardant properties are improved, but mechanical properties such as elongation and flexibility deteriorate
Solution Approach 1:
The patent uses a composite polymer system combining polyethylene and polyolefin elastomer to create a material that can accommodate high flame retardant filler content (up to 60 wt.%) while maintaining mechanical integrity. The composite structure allows the filler to be distributed within a polymer matrix that preserves flexibility and strength.
Solution Approach 2:
The patent optimizes the ratio of polyethylene to polyolefin elastomer (within 5:5 to 95:5 by weight) to balance flame retardancy and mechanical properties. By adjusting these parameters, the composition achieves high elongation (≥100%) even with high filler content, resolving the contradiction between flame retardancy and mechanical strength.
2Stability of the object's composition
If polyolefin elastomer content is increased to improve elongation and flexibility, then elongation at break is improved, but processing difficulty and cost increase
Solution Approach 1:
The patent defines a specific range for polyolefin elastomer content (5-50 wt.%) to achieve the desired elongation properties without excessive processing difficulty. This parameter optimization ensures high elongation (≥100%) while maintaining manufacturability and cost-effectiveness.
Solution Approach 2:
The patent applies different polymer components in specific proportions to achieve local optimization of properties. The polyolefin elastomer provides the necessary flexibility and elongation in critical areas, while polyethylene provides structural stability, creating a balanced composition that is both high-performance and easy to process.
3Adaptability or versatility
If multiple polymer materials and additives are combined to improve multiple properties simultaneously, then one or more properties are improved, but the complexity of composition formulation and prediction increases
Solution Approach 1:
The patent creates a universal polymer composition system based on polyethylene and polyolefin elastomer that can simultaneously achieve flame retardancy, high elongation, flexibility, and mechanical strength. This multi-functional system simplifies formulation by using a core duo of polymers that work together to provide multiple desired properties without requiring complex prediction of interactions among many components.
Data Source
AI summary
The invention relates to strand-shaped elements and polymer compositions used for preparing the strand-shaped elements. The strand-shaped elements comprise an inner structure and a halogen-free polymer composition surrounding the inner structure. 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.