Precipitating Sol Coatings for Low-Concentration Barrier Packaging
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Solution Overview
Problem
Existing plastic packaging materials pose environmental and health concerns due to their manufacturing process, toxicity, and degradation into microplastics, necessitating a cost-effective, environmentally friendly alternative that imparts similar functional properties.
Innovation Solution
Utilizing sols, particularly those in the process of precipitating, by contacting them with a precipitation initiator to form a coating on products, allowing for reduced concentrations to achieve desired functionalities such as impermeability and antimicrobial properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If plastic materials are used to create impermeable packaging, then fluid retention and barrier properties are improved, but environmental harm and health concerns worsen
Solution Approach 1:
The patent changes the chemical composition parameters by replacing hydrocarbon-based plastics with silane-based sols. The sol contains silicon alkoxides that undergo hydrolysis and condensation to form inorganic barrier coatings, fundamentally altering the material composition from organic to inorganic while maintaining barrier functionality and eliminating plastic-related environmental harm
Solution Approach 2:
The patent employs a cost-effective sol formulation using readily available silicon alkoxides and common solvents like ethanol or water. The coating process is designed to be simple and rapid, allowing for easy replacement and reapplication without complex equipment, making it economically viable as a disposable or temporary barrier solution
2Reliability
If 100% sol concentration is used to form functional coatings, then impermeability and durability are improved, but manufacturing cost increases
Solution Approach 1:
The patent optimizes the concentration parameter of sol in the coating formulation, determining that 0.1-10% silane-based sol in a suitable solvent provides optimal balance between coating performance and cost. This parameter optimization reduces material consumption while maintaining crosslinking network formation and barrier properties through controlled hydrolysis and condensation reactions
Solution Approach 2:
The patent introduces a solvent as an intermediary substance that carries the silane-based sol to the substrate surface. The solvent facilitates uniform distribution and controlled evaporation, allowing the active sol components to form effective coatings at lower concentrations without direct application of pure, expensive sol
3Ease of manufacture
If sol is applied without precipitation initiator, then coating formation is simple, but functional properties and crosslinking network formation are reduced
Solution Approach 1:
The patent employs moisture from the ambient environment or substrate as a self-service reagent that triggers hydrolysis and condensation of silane groups. This eliminates the need for external precipitation initiators or complex processing steps, as the coating system automatically activates and forms crosslinked networks through exposure to atmospheric moisture, maintaining both simplicity and functionality
4Strength
If surface preparation is performed before sol application, then adhesion is improved, but manufacturing time and complexity increase
Solution Approach 1:
The patent modifies the chemical parameters of the sol formulation by incorporating coupling agents or surface-active silane species that can chemically interact with diverse substrate surfaces. This chemical modification allows the sol to adhere effectively to metals, plastics, ceramics, and composites without requiring mechanical surface preparation, achieving strong adhesion through molecular-level bonding rather than physical anchoring
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
Sols with a precipitation initiator can form extensive cross-linking networks at lower concentrations, providing durable, thermally resistant coatings that are environmentally friendly and cost-effective, replacing traditional plastics in manufacturing processes.
Implementation Method 1
contacting the sol with a precipitation initiator to initiate precipitation of the sol
Implementation Method 2
Sols may form impermeable and/or anti-microbial and/or alternatively functional coating compositions when applied to a range of materials
Data Source
AI summary
A method comprising providing a sol comprising a solvent; contacting the sol with a precipitation initiator to initiate precipitation of the sol, wherein the precipitation initiator is different to the solvent; and applying the precipitating sol to a product. The methods of the invention may be used with sols comprising a solvent, a metal alkoxide, and optionally a biopolymer and/or a catalyst, with alkoxides comprising metals, organically modified alkoxides comprising metals, alkoxides comprising metalloids, and organically modified alkoxides comprising metalloids all being encompassed by the term ‘metal alkoxide’. Also disclosed is an apparatus for use in the method comprising a first storage vessel; a second storage vessel; one or more pumps; and one or more delivery means.