Reversible Disulfide Adhesive for Apparel Component Separation
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Solution Overview
Problem
The apparel industry faces challenges in recycling clothing due to the mix of materials used in various components, which are often joined by permanent methods like sewing, making disassembly difficult and costly, and manual separation is inefficient for high volumes.
Innovation Solution
The use of a reversible adhesive with disulfide bonds, formed from thiol-containing monomers and oxidizing agents, allows for easy assembly and disassembly of apparel components, enabling efficient separation and recycling by breaking bonds with specific conditions such as temperature or pH changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If sewing or permanent methods are used to join components, then strength and durability are improved, but ease of disassembly deteriorates
Solution Approach 1:
The patent employs adhesives with reversible bonds that change their bonding properties in response to environmental parameters such as pH, temperature, or moisture. The adhesive maintains strong bonding under normal wear conditions but weakens or dissolves when exposed to specific triggers (e.g., alkaline solutions, heat), enabling easy disassembly and component separation for recycling while preserving bond strength during use.
2Manufacturing precision
If manual separation is used to separate components, then material integrity is improved, but productivity deteriorates
Solution Approach 1:
The patent replaces manual mechanical separation with a chemical process. Components joined by reversible adhesive bonds are separated by exposing them to triggering conditions (such as pH changes, heat, or moisture) that cause the adhesive to weaken or dissolve. This chemical mechanism enables rapid, automated separation of components while maintaining material integrity, significantly increasing recycling productivity compared to manual methods.
3Reliability
If permanent joining methods are used, then reliability of assembly is improved, but ease of repair and recycling deteriorates
Solution Approach 1:
The patent uses adhesives with dynamic, reversible bonding characteristics. The adhesive provides reliable, permanent-looking bonds during normal use and washing, ensuring assembly reliability. However, when exposed to specific triggers (heat, pH changes, moisture), the bonds reversibly weaken or break, enabling easy disassembly for repair and recycling. This dynamic behavior allows the same adhesive to provide both permanent and temporary bonding properties.
4Loss of substance
If high volume recycling is pursued, then environmental benefit is improved, but cost and complexity deteriorates
Solution Approach 1:
The patent employs adhesives that respond to simple environmental parameter changes (pH, temperature, moisture) to enable component separation. These triggers can be applied through straightforward processes such as washing with alkaline solutions or applying heat, avoiding complex disassembly equipment. The reversible bonding mechanism allows high-volume recycling to proceed efficiently with minimal additional infrastructure, reducing both cost and complexity while improving recycling rates.
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
This method enables the efficient disassembly of apparel products, allowing for the separation and recycling of components, reducing costs and increasing the scalability of the recycling process.
Implementation Method 1
combining the thiol-containing monomer with an oxidizing agent to form a composition. The composition is applied to a major component of the apparel product or a minor component of the apparel product. The portion of the minor component is coupled with the portion of the major component via the composition. The composition is converted to the adhesive having a disulfide bond
Implementation Method 2
The adhesive including a material having a disulfide bond. The minor component forms a secondary portion configured to be coupled to the major component with an adhesive comprising a disulfide bond.
Data Source
AI summary
Embodiments provide methods of assembling apparel products. The methods include applying a composition to a portion of a major component of the apparel product or a portion of a minor component of the apparel product. The methods include coupling the portion of the minor component with the portion of the major component via the composition. The major component forms a base portion of the apparel product and is configured to be supported and worn at least partially over a portion of a wearer. The minor component forms a secondary portion configured to be coupled to the major component with an adhesive. The methods include converting the composition to the adhesive. The adhesive including a material having a disulfide bond.