Bimodal Polyethylene Recycled Blend Fatigue Resistance
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Solution Overview
Problem
Current recycling methods for polyethylene often result in materials with inferior thermomechanical properties compared to virgin polymers, limiting their use in high-pressure applications due to degradation, contamination, and mixing issues.
Innovation Solution
A polyolefin composition comprising 20-80 wt% bimodal polyethylene and 80-20 wt% recycled polyethylene-propylene blends, optimized with specific comonomers and additives to maintain or improve fatigue crack growth resistance, suitable for high-pressure pipes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If recycled polyethylene is used to replace virgin polyethylene, then plastic waste is recycled and resource efficiency is improved, but thermomechanical properties deteriorate due to degradation and contamination
Solution Approach 1:
The patent applies parameter changes by carefully controlling the molecular weight distribution and composition of the recycled polyethylene through specific processing conditions and additives, thereby maintaining thermomechanical properties while increasing recycling content
Solution Approach 2:
The patent uses composite materials by combining recycled polyethylene with virgin polyethylene in specific ratios and formulations to create a composite plastic material that achieves both recycling goals and maintained performance requirements
2Productivity
If recycled polyethylene is used for high-pressure pipe applications, then waste utilization is improved, but fatigue crack growth resistance deteriorates due to degradation
Solution Approach 1:
The patent applies preliminary action by performing pre-treatment and stabilization processes on the recycled polyethylene before use in high-pressure pipe applications, including additive incorporation to prevent degradation and maintain fatigue resistance
Solution Approach 2:
The patent uses parameter changes by adjusting molecular weight, composition ratios, and processing conditions to ensure the recycled polyethylene achieves the necessary fatigue crack growth resistance for high-pressure applications
3Object-affected harmful factors
If recycled plastic material is used, then environmental impact is reduced, but material quality deteriorates due to contamination and mixing
Solution Approach 1:
The patent applies the extraction principle by separating and removing contaminants from the recycled plastic material through purification processes, thereby improving material quality while maintaining environmental benefits
Solution Approach 2:
The patent uses parameter changes by controlling purification conditions, temperature, and processing parameters to achieve consistent material quality from recycled sources while minimizing contamination effects
Data Source
AI summary
Provided is a polyolefin composition including a) 20-80 wt % (based on the total weight of the polyolefin composition) of at least one bimodal polyethylene including a polyethylene homopolymer and a polyethylene copolymer formed from ethylene and at least one olefin with at least 6 carbon atoms as comonomer with a melt flow rate MFR5 (190° C., 5 kg, measured according to ISO 1133) of at least 0.1 g/10 min b) 80-20 wt % (based on the total weight of the polyolefin composition) of a polyethylene enriched blend of recycled plastic material including polyethylene and polypropylene with a melt enthalpy ratio of PP:PE in the range of 0:100 to 10:90, which is recovered from a waste plastic material derived from post-consumer and/or post-industrial waste, with a melt flow rate MFR5 (190° C., 5 kg, measured according to ISO 1133) of at least 0.8 g/10 min.