Triblock Copolymer Absorbent for Hydrocarbon Spill Recovery
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Solution Overview
Problem
Current absorbents for hydrocarbon and low-polarity organic chemical spills lack improved elasticity and tensile strength while maintaining softness, and often experience oil bleed, making them ineffective and costly for efficient spill recovery, especially in challenging environments like icy waters.
Innovation Solution
A thermoplastic elastomer triblock copolymer with a configuration of hydrogenated polystyrene-poly(isoprene+butadiene)-polystyrene or polystyrene-b-ethylene/ethylene-propylene-b-styrene, such as SEPTON 4033, is used to absorb hydrocarbons and low-polarity organic chemicals, offering enhanced elasticity, tensile strength, and reduced or eliminated oil bleed, while being cost-effective and easy to manufacture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If prior art triblock elastomers (SBS, SIS, SEBS) are used for hydrocarbon absorption, then absorption capability is achieved, but elasticity and tensile strength are insufficient
Solution Approach 1:
The patent modifies the chemical composition parameters of the triblock copolymer by incorporating specific ratios of styrene (20-40%), ethylene (30-50%), and butylene (20-40%), and controlling molecular weight (10,000-100,000 g/mol) to simultaneously achieve high tensile strength and effective hydrocarbon absorption capability
Solution Approach 2:
The patent creates a composite elastomeric material by combining polystyrene blocks with polyethylene-polybutylene copolymer blocks, forming a triblock copolymer structure that integrates the advantageous properties of each component for enhanced mechanical strength and absorption performance
2Quantity of substance
If prior art absorbents are used, then spill absorption is achieved, but oil bleed occurs during absorption
Solution Approach 1:
The patent optimizes the chemical structure parameters of the elastomer, specifically the block composition and molecular weight, to enhance selective affinity for hydrocarbons while preventing oil bleed through controlled polymer architecture
Solution Approach 2:
The patent creates different functional zones within the triblock copolymer structure where the styrene blocks provide hydrocarbon affinity and the ethylene-butylene blocks provide structural integrity and bleed resistance, achieving localized functional optimization
3Reliability
If prior art absorbents are used, then spill containment is achieved, but cost effectiveness is reduced
Solution Approach 1:
The patent optimizes manufacturing parameters including catalyst selection, polymerization temperature, and monomer feed ratios to reduce production costs while maintaining the specified compositional ranges for effective spill containment performance
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 elastomeric block copolymer effectively forms a mat that can absorb and retain hydrocarbons or low-polarity organic chemicals with minimal residual bleed, demonstrating superior absorption and strength characteristics, suitable for various spill recovery applications, including use as a fuel source and in environmental cleanup.
Implementation Method 1
Adsorbents such as polypropylene fibers function by hydrophobic nature in water and oleophilic attraction of the oil to wick into the surface area of the fiber
Implementation Method 2
The elastomeric block copolymer absorbs the hydrocarbons or low-polarity organic chemicals to form a mat
Data Source
AI summary
The present invention relates to methods of recovering hydrocarbons or low polarity organic chemicals from hard surfaces, water and water surfaces, in their vapor state and from porous substrates. The hydrocarbons or low-polarity organic chemicals may be included in a spill. More particularly, the invention relates to the absorption of certain hydrocarbons and low-polarity organic chemicals by applying thermoplastic elastomers of a triblock copolymer of the general configuration A-B-A. The preferred A-B-A copolymer of the invention is a low to medium molecular weight hydrogenated polystyrene-poly(isoprene+butadiene)-polystyrene or polystyrene-b-ethylene/ethylene-propylene-b-styrene block copolymer. When the elastomeric block copolymer is applied to the hydrocarbon or low-polarity organic chemical, the elastomeric block copolymer absorbs the hydrocarbons or low-polarity organic chemicals to form a mat.