Recycled Metallized Polyolefin Foam via Crosslinking and Foaming
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Solution Overview
Problem
Metallized polyolefin waste materials, commonly used in packaging and electronic components, are difficult to recycle and often end up in landfills due to the lack of effective recycling methods, leading to increased costs and environmental concerns.
Innovation Solution
The development of crosslinked, closed cell continuous foam structures made from recycled metallized polyolefin materials, which involves extruding a mixture of recycled metallized polyolefin, polypropylene, polyethylene, and a crosslinking agent, followed by irradiation and foaming to create a foam structure that can be used in various applications, reducing waste and creating a new market for recycled materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If metallized polyolefin waste is sent to landfills, then disposal is achieved, but environmental harm and costs increase
Solution Approach 1:
The patent transforms the physical and chemical parameters of metallized polyolefin waste through crosslinking (changing molecular structure) and foaming (changing density and volume). This converts non-recyclable waste into a usable foam material with new properties, resolving the contradiction between disposal and material utilization
Solution Approach 2:
The invention creates a composite foam structure incorporating metallized polyolefin particles within a polymer matrix. This composite approach allows the waste material to be integrated into a new product form, simultaneously achieving disposal and creating valuable material with enhanced properties
2Loss of substance
If metallized polyolefin is recycled into foam structures, then waste utilization improves, but manufacturing complexity increases
Solution Approach 1:
The patent extracts the metallized polyolefin from waste streams and separates it into a distinct component to be incorporated into the foam matrix. This extraction approach simplifies the recycling process by focusing on integrating one specific waste material rather than processing complex mixed waste
Solution Approach 2:
The polymer matrix acts as an intermediary that binds the metallized polyolefin particles together and provides structural continuity. This mediator enables the integration of waste particles into a cohesive foam structure without requiring direct bonding between particles themselves
3Strength
If crosslinking and foaming processes are applied, then foam structure properties improve, but energy consumption increases
Solution Approach 1:
The crosslinking process is performed before the foaming step, creating a pre-crosslinked polymer network that provides structural framework. This preliminary action allows the subsequent foaming to occur within a stabilized matrix, potentially reducing the total energy required compared to simultaneous or reverse sequencing
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
This solution provides a viable outlet for metallized polyolefin waste, reduces manufacturing costs by avoiding landfill expenditures, and lowers the carbon footprint by utilizing recycled materials in the production of foam structures suitable for diverse applications.
Implementation Method 1
extruding 5-75 wt. % recycled metallized polyolefin material; 25-95 wt. % polypropylene, polyethylene, or combinations thereof; a crosslinking agent; and a chemical blowing agent in an extruder
Implementation Method 2
The extruded structure may be irradiated with ionizing radiation. The ionizing radiation may alpha rays, beta rays, gamma rays, or electron beams. The irradiation can crosslink the extruded structure to a crosslinking degree of 20-75%
Implementation Method 3
a chemical blowing agent in an extruder... The chemical blowing agent may be azodicarbonamide in the extruder feed
Data Source
AI summary
A physically crosslinked, closed cell continuous foam structure derived from recycled metallized polyolefin material; polypropylene, polyethylene, or combinations thereof, a crosslinking agent, and a chemical blowing agent is obtained. The foam structure is obtained by extruding a structure comprising a foam composition, irradiating the extruded structure with ionizing radiation, and continuously foaming the irradiated structure.