Recycled Polyolefin Composition Balancing Impact Strength and Modulus
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Solution Overview
Problem
The multicomponent nature of recycled polyolefin materials results in low mechanical and optical performances when part of the virgin polymer is replaced by recycled polymer, leading to a deterioration of mechanical properties.
Innovation Solution
A specific formulation of recycled polypropylene composition comprising 50-70 wt% recycled polypropylene, 20-40 wt% polypropylene ethylene copolymer, and 4-18 wt% inorganic filler, such as talc, with defined properties, is blended to achieve a balanced impact strength and tensile modulus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If recycled polyolefin materials are used to replace part of the virgin polymer, then environmental impact is reduced and material cost is decreased, but mechanical and optical performances deteriorate
Solution Approach 1:
The patent applies composite materials by formulating a multi-component polyolefin composition comprising recycled polyolefin (50-70 wt%), compatibilizer (5-15 wt%), and specific polypropylene-ethylene copolymer (20-40 wt%). This composite approach allows the system to maintain mechanical performance while incorporating recycled content, resolving the contradiction between environmental benefit and mechanical strength.
Solution Approach 2:
The patent uses a compatibilizer as an intermediary substance to mediate between the recycled polyolefin and the polypropylene-ethylene copolymer. The compatibilizer (5-15 wt%) acts as a bridge that improves interfacial adhesion and compatibility between the different polymer components, preventing the mechanical performance deterioration that normally occurs when recycled materials are incorporated.
2Quantity of substance
If recycled polyolefin materials are used to replace part of the virgin polymer, then material cost is decreased, but mechanical and optical performances deteriorate
Solution Approach 1:
The patent creates a composite material system that optimizes the proportion of recycled content (50-70 wt%) while maintaining mechanical performance through the addition of compatibilizer (5-15 wt%) and specific polypropylene-ethylene copolymer (20-40 wt%). This composite formulation allows maximum use of recycled material without sacrificing mechanical properties.
Solution Approach 2:
The patent changes the chemical and physical parameters of the polymer system by introducing a compatibilizer that modifies the interfacial properties between different polymer components. This parameter change (adding compatibilizing agents) enables the system to maintain mechanical performance at high recycled content levels.
3Strength
If compatibilizer ingredients are used to mitigate mechanical properties deterioration, then mechanical performance is improved, but formulation complexity increases
Solution Approach 1:
The patent applies parameter changes by selecting a compatibilizer with specific properties (polypropylene-ethylene copolymer with controlled ethylene content and molecular weight parameters). By optimizing these parameters, the patent achieves mechanical performance improvement with a relatively simple formulation approach, rather than using complex multi-component compatibilizer systems.
Data Source
Figure 1
AI summary
A recycled polyolefin composition comprising: A) from 50 wt% to 70 wt%; of a recycled polypropylene composition; B) from 20 wt% to 40 wt%; of a propylene ethylene copolymer comprising: b1) from 29 wt% to 59 wt%; of a propylene homopolymer; b2) from 41 wt% to 71 wt%; of a propylene ethylene copolymer containing from 30.8 wt% to 62.0 wt%; of ethylene derived units; C) from 4 wt% to 18 wt%; of a inorganic filler;