Polyurethane Foam Oil Absorbent Element with Open Cells
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Solution Overview
Problem
Current oil spill cleanup methods are inefficient due to materials that lack buoyancy, high oil retention, and ease of transport, and existing solutions disperse in rough seas, leading to difficulty in recovery and rapid oil leakage.
Innovation Solution
A polyurethane foam-based absorbent element with a high percentage of open cells, treated with polypyrrole, graphene, and calcium carbonate, and contained in a non-woven fabric or netting, providing excellent buoyancy, high absorption capacity, and resistance to oil desorption, along with a modular design for easy handling and reuse.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If polyurethane foam blocks are used to absorb spilled oil, then oil absorption capacity is improved, but buoyancy is lost after impregnation with oil
Solution Approach 1:
The patent employs a highly porous polyurethane foam structure with controlled cell morphology to enable rapid oil penetration while maintaining buoyancy. The porous architecture provides high surface area for oil absorption without excessive weight gain, resolving the contradiction between absorption capacity and buoyancy retention.
Solution Approach 2:
The invention uses composite polyurethane foam formulations combining different polyol types (polyether and polyester) with specific isocyanates to achieve optimal balance between oil absorption, water repellency, and buoyancy. The composite material structure allows simultaneous achievement of high oil capacity and sustained floating capability.
2Strength
If high density polyurethane foam blocks are used, then structural strength is improved, but transport logistics become disadvantageous
Solution Approach 1:
The patent optimizes foam density parameters and cell structure characteristics to achieve the minimum density required for buoyancy while maintaining adequate mechanical strength. By controlling cell size distribution and wall thickness, the material attains sufficient structural integrity for rough sea conditions without excessive weight that would hinder transport.
3Quantity of substance
If mechanical stress is applied to recover oil from absorbent material, then oil extraction is improved, but rapid leakage of previously absorbed oil occurs
Solution Approach 1:
The controlled porous structure with specific cell morphology allows selective permeability that facilitates oil release during recovery while preventing water ingress. The pore architecture enables mechanical extraction of absorbed oil without causing rapid leakage, maintaining retention during normal operation but allowing controlled discharge during recovery operations.
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
The absorbent element effectively absorbs and retains oil, maintains buoyancy, and is easily transportable, allowing for efficient oil spill cleanup with reduced environmental impact and multiple reuse cycles, while minimizing oil mixing with water and facilitating easy separation and recovery.
Implementation Method 1
the above-mentioned presence of open cells allows obtaining a rapid penetration of the oil into the oil-absorbent material
Implementation Method 2
adsorbed at the surface of the open cells, the oil-absorbent material comprises polypyrrole, graphene, calcium carbonate or mixtures thereof in order to improve the oleophilia of said material
Implementation Method 3
a material suitable for absorbing oil spills must be able to combine, purely by way of example, good buoyancy even after impregnation with the oil
Data Source
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AI summary
Absorbent element for spilled petroleum or its derivatives comprising an oil-absorbent, hydrophobic and oleophilic material, essentially based on polyurethane foam, having a specific weight in the range of 15-30 g/l and delimiting open cells and closed cells, the latter being in a percentage equal to or lower than 10% of the total cells. The invention further relates to an assembly comprising a plurality of such elements and a method for fabricating an oil-absorbent material.