Phase-Separated Treatment Liquid for Pressure-Sensitive Tape Recycling
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Solution Overview
Problem
The disposal of pressure-sensitive adhesive tape waste poses a significant environmental burden and resource waste, necessitating a recycling method that minimizes environmental impact and facilitates resource reuse.
Innovation Solution
A pressure-sensitive adhesive treatment liquid comprising water, an organic solvent, and an alkaline compound is used to form a phase-separated state, enabling easy removal of the adhesive and recovery of a recycled base material and polymer composition from pressure-sensitive adhesive tape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If pressure-sensitive adhesive tape waste is subjected to conventional waste treatment (burning or disposal), then waste removal is achieved, but environmental load increases and resources are lost
Solution Approach 1:
The invention changes the chemical parameters of the treatment liquid by using an alkaline compound with specific concentration (0.001-50 wt%) to alter the adhesive's properties, enabling it to be removed and recovered rather than disposed of, thus preventing resource loss and reducing environmental load
Solution Approach 2:
The treatment liquid utilizes phase-separated state between organic solvent and water to selectively interact with and remove the adhesive layer from the base material, allowing the adhesive to be recovered as a reusable resource instead of being wasted or polluting the environment
2Productivity
If a pressure-sensitive adhesive treatment liquid is developed to remove adhesive easily, then adhesive removal efficiency improves, but liquid composition complexity increases
Solution Approach 1:
The treatment liquid is segmented into two distinct phases: an organic solvent phase that selectively dissolves the adhesive and an aqueous phase that can be easily separated and reused. This segmentation allows efficient adhesive removal while maintaining simple, manageable liquid composition
Solution Approach 2:
The alkaline compound acts as an intermediary substance that facilitates the interaction between the organic solvent and the adhesive, enhancing removal efficiency without requiring complex liquid composition. The alkaline compound modifies the adhesive's properties to improve solubility in the organic solvent phase
3Productivity
If phase-separated state is used in treatment liquid, then adhesive removal effectiveness improves, but separation and handling difficulty increases
Solution Approach 1:
The organic solvent phase containing the dissolved adhesive is extracted from the treatment liquid and separated from the aqueous phase. This extraction allows the adhesive to be removed effectively while the separated phases can be easily handled and the aqueous phase reused, offsetting the handling complexity
Solution Approach 2:
The alkaline compound concentration is optimized to achieve complete adhesive removal while maintaining stable phase separation. By controlling the chemical parameters within specific ranges, the treatment liquid achieves both high effectiveness and manageable handling characteristics
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 method effectively recovers a recycled base material and polymer composition with reduced contamination and corrosion, promoting resource recycling and reducing environmental load.
Implementation Method 1
the organic solvent and the water form a phase-separated state
Implementation Method 2
an alkaline compound... effectively recovers a recycled base material and polymer composition with reduced contamination and corrosion
Data Source
AI summary
Provided is a pressure-sensitive adhesive treatment liquid, which can easily remove a pressure-sensitive adhesive and has a small environmental load. Also provided is a method of producing a recycled base material with a pressure-sensitive adhesive treatment liquid, the method including easily recovering a recycled base material suppressed in contamination and corrosion from a pressure-sensitive adhesive tape including a base material and a pressure-sensitive adhesive with such pressure-sensitive adhesive treatment liquid. Also provided is a method of producing a recycled polymer composition that may serve as a raw material for a recycled pressure-sensitive adhesive with such pressure-sensitive adhesive treatment liquid. The pressure-sensitive adhesive treatment liquid according to an embodiment of the present invention is a pressure-sensitive adhesive treatment liquid for treating a pressure-sensitive adhesive, including: water; an organic solvent; and an alkaline compound, wherein the organic solvent and the water form a phase-separated state.