Multilayered Resin Recovery Pretreatment Agent for Ink Dispersion
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Solution Overview
Problem
Multi-layered resin films are difficult to recycle due to contamination from printing ink, and existing recovery methods using morpholine or sodium hydroxide solutions are hazardous or ineffective in preventing ink re-adhesion.
Innovation Solution
A pretreatment agent comprising a polar solvent with an SP value of 9 to 13, quaternary ammonium salt, and a surfactant with HLB of 11.0 to 14.0 or C13+ fatty acid group, which dissolves adhesive layers and compatibilizes printing ink, preventing its adhesion to recovered resins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a multi-layered film is immersed in a treatment agent solution to dissolve a specific layer, then the multi-layered film is separated into its constituent resins, but the printing ink component adheres to the recovered resin causing contamination
Solution Approach 1:
A surfactant is introduced as an intermediary substance between the treatment agent solution and the printing ink. The surfactant adsorbs onto the ink particles and emulsifies them in the treatment solution, preventing the ink from adhering to the recovered resin. This mediator resolves the contradiction by enabling effective separation while simultaneously preventing contamination through emulsification and steric hindrance.
Solution Approach 2:
The invention changes the chemical parameters of the treatment agent solution by adding specific surfactants with controlled HLB values (3-18) and concentrations (0.01-10 wt%). This parameter modification transforms the solution's interfacial properties, enabling it to simultaneously dissolve adhesive layers and emulsify printing ink, thus achieving both separation and contamination prevention.
2Manufacturing precision
If morpholine liquid is used for recovery, then the multi-layered film can be separated, but the aqueous solution becomes a deleterious substance requiring special management
Solution Approach 1:
The invention replaces morpholine with alternative treatment agents such as alkaline solutions (pH 10-14), organic solvents, or their mixtures. By changing the chemical composition parameters while maintaining the necessary solubility and separation capabilities, the invention achieves effective layer separation without generating hazardous waste, thus resolving the contradiction between separation performance and environmental safety.
Solution Approach 2:
The invention employs readily available, non-hazardous treatment agents like common alkaline solutions or organic solvents that can be easily disposed of or treated after use. These substitutes replace the persistent hazardous morpholine solution with materials that pose minimal environmental risk, enabling separation functionality without long-term harmful effects.
3Manufacturing precision
If sodium hydroxide aqueous solution is used, then aluminum-containing multi-layered films can be stripped, but the solution cannot prevent ink re-adhesion and has limited applicability
Solution Approach 1:
The invention develops a multi-functional treatment agent system that combines alkaline components (for aluminum stripping), organic solvents (for adhesive dissolution), and surfactants (for ink emulsification). This composite formulation enables a single treatment solution to effectively process various multi-layered film compositions regardless of whether they contain aluminum, thereby achieving both targeted stripping and broad applicability.
Solution Approach 2:
The treatment agent is formulated as a composite system combining multiple chemical components: alkaline substances (NaOH, KOH) for metal layer removal, organic solvents (alcohols, esters) for polymer adhesive dissolution, and surfactants for ink emulsification. This composite formulation allows the solution to simultaneously perform multiple functions on different layers of multi-layered films, expanding its versatility beyond what single-component solutions can achieve.
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 pretreatment agent effectively separates multi-layered resin films into clean components, preventing ink contamination and enabling efficient recycling by dissolving adhesive layers and dispersing ink in the treatment liquid.
Implementation Method 1
a treatment in which a multi-layered film is immersed in a treatment agent solution to dissolve a specific layer such as an adhesive layer, thereby separating the multi-layered film into its constituent resins
Implementation Method 2
a nonionic surfactant having an HLB of 11.0 to 14.0 and/or an anionic surfactant having a C13 or higher fatty acid group
Data Source
AI summary
Provided is a multi-layered resin molded body recovery pretreatment agent, which can prevent the contamination of resin films with a printing ink in a multi-layered resin molded body recovery pretreatment. The multi-layered resin molded body recovery pretreatment agent includes (A) a polar solvent having an SP value of 9 to 13, (B) a quaternary ammonium salt represented by a general formula (1), and (C) a nonionic surfactant having an HLB of 11.0 to 14.0 and/or an anionic surfactant having a C13 or higher fatty acid group.