Polyolefin Surface Texturing Using Green Solvents
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Solution Overview
Problem
Current methods for increasing hydrophobicity in polyolefin articles, such as polyethylene and polypropylene, often involve toxic solvents like xylene and toluene, which are not suitable for food contact and complicate recycling due to residual solvent issues and additional additive requirements.
Innovation Solution
A process using green solvents like vegetable oils, terpenes, and alkanes with boiling points above the crystallization temperature of polyolefins, devoid of halogenated atoms and aromatic groups, to treat polyolefin surfaces, enhancing hydrophobicity and potentially achieving superhydrophobicity without adding toxic compounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional solvents like xylene and toluene are used to increase hydrophobicity, then the hydrophobicity of polyolefin articles is improved, but the toxicity and recyclability are worsened due to residual solvent issues and additional additive requirements
Solution Approach 1:
The patent changes the chemical composition parameter of the solvent from conventional aromatic solvents (xylene, toluene) to green solvents (vegetable oils, terpenes, alkanes) that are non-toxic and suitable for food contact, while maintaining the solvent's ability to dissolve polyolefins and create the desired surface morphology for hydrophobicity
Solution Approach 2:
The patent converts the previously harmful residual solvent issue into a benefit by using green solvents that leave no toxic residues, thereby improving both hydrophobicity and safety for food contact applications, and simplifying the recycling process by eliminating the need to remove toxic additives
2Reliability
If conventional solvents like xylene and toluene are used to increase hydrophobicity, then the hydrophobicity of polyolefin articles is improved, but the recycling process becomes more complex and costly
Solution Approach 1:
The patent extracts and removes the toxic aromatic components from the solvent system, replacing them with benign green solvents, thereby simplifying the recycling process as no additional steps are needed to remove harmful additives or residues
Solution Approach 2:
The patent changes the chemical parameter of the solvent from toxic to non-toxic, which directly simplifies the recycling complexity by eliminating the need for special handling and removal procedures for hazardous substances
3Reliability
If spray technology or additive deposition is used to achieve superhydrophobicity, then the hydrophobicity is improved, but the device complexity and cost increase
Solution Approach 1:
The patent enables the polyolefin article to self-form the hydrophobic surface morphology through the interaction with green solvents during normal processing, eliminating the need for external spray equipment or complex additive deposition systems
Solution Approach 2:
The patent replaces complex mechanical spray systems with a simpler chemical process where green solvents interact with polyolefins to spontaneously create the desired surface morphology for hydrophobicity
4Reliability
If micron-scale engraving techniques are used to create surface patterns, then the hydrophobicity is improved, but the production speed decreases making it unsuitable for high-speed mass production
Solution Approach 1:
The patent replaces slow mechanical engraving processes with a rapid chemical interaction between green solvents and polyolefins that spontaneously forms the desired surface morphology, enabling high-speed mass production while maintaining hydrophobicity
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 process effectively increases hydrophobicity, including the potential for superhydrophobicity, while being fast, cost-effective, and suitable for industrial scale production, reducing toxicity and facilitating easier recycling by minimizing surface soiling.
Implementation Method 1
dissolving the polymer at the surface of the article in a green solvent to form a solution
Implementation Method 2
crystallizing the polymer to form a textured surface
Implementation Method 3
A surface is said superhydrophobic when, simultaneously, it has: a water contact angle larger than 150°; a hysteresis angle lower than 10°
Data Source
AI summary
The disclosure provides a process for treatment of an article (1) made of a polymer composition; comprising the steps of providing an article (1) with a surface, the article being made of a polymer composition comprising one or more polyolefins; providing one or more texturing solvents (3, 5, 7, 9) selected from one or more vegetable oils, one or more terpenes, one or more alkanes and any combination thereof; wherein the one or more texturing solvents (3, 5, 7, 9) are further selected to have a boiling point which is above the crystallisation temperature Tc of the one or more polyolefins and to be devoid of a halogenated atom and/or an aromatic group; contacting the surface of the article (1) with the one or more texturing solvents (3, 5, 7, 9); and recovering an article with a textured surface with water contact angle following ISO 19403-6:2017 that is increased by comparison to the initial water contact angle.