Peroxide-Free Polymer Composition for Heat-Stable Cable Insulation
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Solution Overview
Problem
Existing polymer compositions used in cable applications, particularly for high voltage and extra high voltage cables, face challenges with dimensional stability under heat due to the absence of crosslinks, and the use of peroxides leads to undesirable volatile by-products that affect electrical properties and increase production costs.
Innovation Solution
A polymer composition comprising 20 to 84 wt% low density polyethylene (LDPE), 15 to 75 wt% polypropylene, and 0.5 to 20 wt% styrene block copolymer, which eliminates the need for peroxides and crosslinking, enhancing thermomechanical properties and dimensional stability without the need for a degassing step.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If peroxides are used for crosslinking to improve heat and deformation resistance, then dimensional stability at elevated temperatures is improved, but volatile decomposition products are formed which negatively influence electrical properties and require additional degassing steps
Solution Approach 1:
The invention extracts and eliminates the harmful peroxide crosslinking step while retaining the beneficial dimensional stability through a peroxide-free composition of LDPE, polypropylene, and styrene block copolymer
Solution Approach 2:
The invention uses a thermoplastic composition that can be processed and discarded without the need for complex degassing equipment required for peroxide-crosslinked materials, simplifying the production process
2Strength
If peroxide crosslinking is used to improve mechanical strength and heat resistance, then the polymer composition gains better thermomechanical properties, but the production process becomes more complex and time-consuming due to additional crosslinking and degassing steps
Solution Approach 1:
The invention removes the crosslinking and degassing steps from the production process, achieving the desired mechanical strength and heat resistance through the optimized thermoplastic composition of LDPE, polypropylene, and styrene block copolymer
Solution Approach 2:
The invention enables continuous production without interruption for crosslinking and degassing steps, as the peroxide-free composition can be directly extruded and processed immediately after compounding
3Reliability
If peroxides are used for crosslinking to improve electrical properties through reduced leakage current, then the cable insulation performance is enhanced, but the volatile by-products formed during crosslinking require energy-consuming removal steps
Solution Approach 1:
The invention extracts and eliminates the energy-consuming degassing step by using a peroxide-free composition that does not generate volatile decomposition products, while maintaining good electrical properties through the optimized polymer blend
Solution Approach 2:
The composition self-regulates to prevent formation of harmful volatile products during processing, eliminating the need for external degassing equipment and energy input
Data Source
AI summary
The invention provides a polymer composition comprising (i) 20 to 84 wt % LDPE; (ii) 15 to 75 wt % of a polypropylene; and (iii) 0.5 to 20 wt % of a styrene block copolymer.