High Melt Flow Polypropylene Composition for Automotive Parts
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Solution Overview
Problem
The recycling of post-consumer polyolefin materials is hindered by contamination and limited mechanical properties, making it difficult to utilize them in high-quality applications like fiber-reinforced composites, especially in the automotive industry, due to challenges in separating pure polymers from household trash and the presence of contaminants.
Innovation Solution
A composition comprising a mixed-plastics polypropylene blend, blended with specific propylene homopolymers, which balances mechanical and impact properties, allowing for the creation of high melt flow rate materials suitable for automotive applications, by carefully selecting the propylene homopolymer components from post-consumer recycled streams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If post-consumer recycled polyolefin materials are used, then environmental sustainability is improved, but mechanical properties and purity deteriorate due to contamination and polymer blending
Solution Approach 1:
The patent applies parameter changes by carefully selecting propylene homopolymer components with specific melt flow rates (one with MFR ≥ 500 g/10min and another with MFR ≥ 80 g/10min) and controlling the mixed-plastics blend to contain 20-60 wt% polyethylene. This precise parameter control transforms the mechanical properties of recycled materials, achieving tensile strength ≥ 30 MPa and elongation at break ≥ 5% while maintaining high sustainability through post-consumer recyclate usage.
Solution Approach 2:
The patent creates a composite material system by blending post-consumer recycled polyolefin mixed-plastics (containing both polypropylene and polyethylene) with virgin propylene homopolymers. This composite approach allows the heterogeneous recycled blend to be combined with pure virgin polymers, achieving synergistic effects that improve overall mechanical properties while maintaining environmental benefits.
2Productivity
If post-consumer recycled polyolefin materials are used, then resource efficiency is improved, but material purity deteriorates due to contamination with non-polyolefin materials
Solution Approach 1:
The patent specifies precise compositional parameters for the mixed-plastics polypropylene blend, requiring it to contain 20-60 wt% polyethylene and be free from polyamide, polyester, and polystyrene contaminants. By controlling these parameters, the patent achieves acceptable material purity suitable for automotive applications while maximizing resource efficiency through the use of post-consumer recyclates.
3Ease of manufacture
If high melt flow rate is achieved for fiber reinforced applications, then processability is improved, but mechanical strength may deteriorate
Solution Approach 1:
The patent achieves optimal processability by incorporating a propylene homopolymer with very high melt flow rate (MFR ≥ 500 g/10min) into the composition. This high MFR component enables excellent flow characteristics for fiber reinforcement and complex molding applications while the overall composition maintains tensile strength ≥ 30 MPa through the balanced blend design.
Solution Approach 2:
The patent creates a composite polymer system combining three different propylene homopolymers with varying melt flow rates. This composite material approach allows the high-MFR component to provide processability while the other components (including one with MFR ≥ 80 g/10min and another with MFR ≥ 10 g/10min) contribute to mechanical strength, achieving both ease of manufacture and adequate strength.
4Adaptability or versatility
If balanced mechanical properties are achieved in recycled polypropylene compositions, then application range is improved, but formulation complexity increases
Solution Approach 1:
The patent achieves balanced mechanical properties by controlling specific parameters: the mixed-plastics blend contains 20-60 wt% polyethylene, the first propylene homopolymer has MFR ≥ 500 g/10min, the second has MFR ≥ 80 g/10min, and the final composition achieves tensile strength ≥ 30 MPa, elongation at break ≥ 5%, and impact strength ≥ 2 kJ/m². These controlled parameters enable wide application range including automotive parts and fiber-reinforced composites.
Data Source
AI summary
The present invention relates to a composition obtainable by blending at least components (A), (B) and (C) (A) 25 wt.-% to 75 wt.-%, preferably 35 to 65 wt.-%, more preferably 40 to 60 wt.-% of a mixed-plastics polypropylene blend; (B) 17 wt.-% to 65 wt.-%, preferably 20 to 55 wt.-%, more preferably 25 to 50 wt.-% of a first propylene homopolymer; and (C) 3 wt.-% to 30 wt.-%, preferably 5 to 27 wt.-%, more preferably 7 to 25 wt.-% of a second propylene homopolymer.