Silicone Rubber Polyolefin Blend Compatibilization for Cold Shrink Splices
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Solution Overview
Problem
Current cold shrink products face challenges with low tear resistance and alternating current breakdown (ACBD) strength, which can lead to damage during installation and service life, while maintaining the need for excellent tensile recovery performance.
Innovation Solution
A composition comprising silicone rubber, ethylene/α-olefin interpolymer, a filler, and an α,β-unsaturated carboxylic acid, optionally with additives like plasticizers and peroxide curing agents, enhances interfacial interactions and mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If silicone rubber is used for cold shrink products, then tensile recovery performance is improved, but tear resistance and ACBD strength deteriorate
Solution Approach 1:
The patent uses a composite material system consisting of silicone rubber combined with peroxide, filler, and optionally other additives. This composite approach allows the material to achieve both excellent tensile recovery performance from the silicone rubber and improved tear resistance and ACBD strength from the synergistic combination with peroxide and filler, resolving the contradiction between these properties.
2Strength
If blends of silicone rubber with polyolefin elastomer are used, then tear resistance and dielectric strength are improved, but compatibility deteriorates
Solution Approach 1:
Instead of using expensive pre-functionalized polymers (silane- or maleic anhydride grafted PO elastomers), the patent employs a simple peroxide-based formulation that achieves compatibility and improved properties through in-situ reactions during processing. This approach reduces cost and production time while avoiding the compatibility issues associated with conventional blending methods.
3Stability of the object's composition
If silane- or maleic anhydride grafted PO elastomers are added to improve compatibility, then compatibility between PO elastomers and silicone rubber is improved, but cost and production time increase
Solution Approach 1:
The patent replaces expensive pre-functionalized polymers with a simple peroxide-based formulation that achieves compatibility through in-situ reactions during processing. This eliminates the need for complex pre-synthesis steps and expensive raw materials, significantly reducing both production time and cost while maintaining or improving compatibility.
Solution Approach 2:
The peroxide is incorporated into the formulation to enable in-situ crosslinking and compatibility enhancement during the molding or processing step itself, rather than requiring pre-functionalization of the polymers beforehand. This preliminary preparation of the formulation allows for simplified processing and reduced production time.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides improved tear resistance and ACBD strength while maintaining tensile recovery performance, offering a cost-effective alternative to traditional silicone rubber-based technologies.
Implementation Method 1
peroxide curing agents, enhances interfacial interactions and mechanical properties
Implementation Method 2
an α,β-unsaturated carboxylic acid, enhances interfacial interactions
Implementation Method 3
a filler, enhances interfacial interactions and mechanical properties
Implementation Method 4
a low tensile permanent set is required
Data Source
AI summary
A cold shrink article made from a composition comprising (A) a silicone rubber; (B) an ethylene/α-olefin interpolymer; (C) a filler; and (D) an α,β-unsaturated carboxylic acid.The composition may optionally include additives selected from the group consisting of plasticizer, peroxide curing agent,antioxidant,process additives,flame retardant and combinations thereof.