Deinking Plastic Substrates with Surfactant and Base
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Solution Overview
Problem
Current methods for deinking plastic substrates are expensive and inefficient, making recycling of printed plastic packaging materials economically unviable, as they fail to effectively remove inks without causing physical or health hazards.
Innovation Solution
The use of trialkyl hydroxyalkyl ammonium salt surfactants in an aqueous deinking solution, combined with a base, to effectively remove inks from plastic substrates, allowing for a more economical and efficient recycling process that also addresses additional contaminants like food waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional surfactants, solvents and acid or caustic conditions are used for deinking, then ink removal is achieved, but the process becomes too expensive to make recycling economically viable
Solution Approach 1:
The invention changes the chemical parameters of the deinking solution by using specific concentrations of caustic soda (1-6% w/w), hydrogen peroxide (0.1-2% w/w), and the novel surfactant (0.01-0.5% w/w) to achieve effective ink removal at lower costs compared to conventional methods
Solution Approach 2:
The invention creates a composite deinking solution system combining caustic soda, hydrogen peroxide, and trialkyl hydroxyalkyl ammonium surfactant that work synergistically to remove inks effectively while maintaining economic viability for recycling operations
2Manufacturing precision
If multiple cleaning, washing and deinking steps are used to achieve high-quality recycled plastic, then the quality of recycled plastic is improved, but the process complexity and time requirements increase
Solution Approach 1:
The invention merges cleaning, washing, and deinking functions into a single integrated treatment step using the composite solution, eliminating the need for multiple separate process stages while achieving high-quality deinking results
Solution Approach 2:
The deinking solution exhibits multi-functionality by simultaneously performing cleaning, washing, and ink removal tasks, allowing a single process to achieve what traditionally required multiple specialized steps
3Manufacturing precision
If conventional deinking methods are used, then some ink removal is achieved, but degradation products of the inks cause visible or physical imperfections and health hazards
Solution Approach 1:
The invention employs hydrogen peroxide as a strong oxidant in the deinking solution to completely break down ink molecules and prevent the formation of harmful degradation products, ensuring the recycled plastic is free from visible imperfections and health hazards
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 trialkyl hydroxyalkyl ammonium salt surfactants provide a cost-effective deinking process that results in high-quality recycled plastic, reducing the need for multiple cleaning steps and enabling the reuse of deinked plastic substrates in food-grade applications.
Implementation Method 1
the surfactant being a trialkyl hydroxyalkyl ammonium salt
Implementation Method 2
exposing the plastic substrate to an aqueous deinking solution
Data Source
AI summary
This invention relates to the use of a surfactant for deinking plastic substrates. The invention also relates to a process for deinking plastic substrates with a deinking solution comprising the surfactant and a base.