Polypropylene Semi-Homogeneous Phase Composition
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Solution Overview
Problem
Conventional polymer compositions with a rubber-phase filler dispersed in a polypropylene matrix suffer from insufficient flexibility, bendability, and whitening phenomena due to heterogeneous phase morphology, and face limitations in adding inorganic flame retardant agents without compromising mechanical properties.
Innovation Solution
A polymer composition with a semi-homogeneous phase morphology, where a propylene copolymer rubber-phase filler exhibits high miscibility with the polypropylene matrix, achieved by an elution rate of less than 50% in a xylene-based solvent, allowing for enhanced flexibility, bendability, and increased inorganic additive content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a heterogeneous phase structure with propylene copolymer particles dispersed in polypropylene matrix is used to improve flexibility and bendability, then flexibility and bendability are improved, but interfacial separation occurs upon bending causing micro-voids and stress whitening
Solution Approach 1:
The patent changes the phase morphology parameter from heterogeneous to semi-homogeneous by controlling the dispersion state of propylene copolymer in polypropylene matrix. This is achieved by optimizing processing conditions and composition ratios to create a semi-homogeneous phase where the rubber filler is uniformly distributed at a molecular level, preventing interfacial separation while maintaining flexibility and bendability.
2Object-affected harmful factors
If inorganic flame retardant agents are added to polypropylene to improve flame retardancy, then flame retardancy is improved, but mechanical properties deteriorate
Solution Approach 1:
The patent creates a composite material system combining polypropylene matrix, propylene copolymer filler, and inorganic flame retardant agents in a semi-homogeneous phase structure. The propylene copolymer acts as a compatibilizer that binds the flame retardant particles to the matrix, allowing high flame retardant content (50-150 parts per 100 parts polypropylene) while maintaining mechanical properties through the unified semi-homogeneous morphology.
3Temperature
If crosslinked polyethylene is used as insulation layer to achieve high heat resistance, then heat resistance is improved, but recycling becomes impossible requiring incineration which causes environmental problems
Solution Approach 1:
The patent replaces expensive crosslinked polyethylene with a thermoplastic polypropylene-based composition that can be melted and recycled. The semi-homogeneous phase structure with propylene copolymer provides sufficient heat resistance for cable insulation applications, enabling 100% recycling by melting and reprocessing, thus eliminating the need for incineration and associated environmental pollution.
Data Source
AI summary
Disclosed is a polymer composition having a semi-homogeneous phase that exhibits excellent electrical, mechanical and thermal properties while satisfying flexibility, bendability and impact resistance. More specifically, disclosed is a polymer composition having a morphology in which a rubber-phase filler of a propylene copolymer is dispersed in a matrix of polypropylene, wherein an elution rate of the rubber-phase filler in a xylene-based solvent is less than 50%, based on the content of the rubber-phase filler such that the rubber-phase filler forms a semi-homogeneous phase with the matrix.