pH-Sensitive 3-Oxindole Dyes for Reversible Textile Color Change
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Solution Overview
Problem
There is a need for color changeable textile materials, particularly denim, that can be easily customized by end-users through pH-sensitive dyes, which can change color in response to pH conditions, allowing for reversible color modifications.
Innovation Solution
Development of novel 3-oxindole derivatives that can be used as pH-sensitive dyes, synthesized by reacting t-Boc-protected indigo with sodium amide, allowing for reversible color changes from yellow/red to blue upon alkali washing and back to yellow/red with acidic treatments, suitable for use in textile dyeing processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional dyes are used for textile materials, then the textiles have stable color, but they cannot change color in response to pH conditions or external stimuli
Solution Approach 1:
The patent applies the dynamics principle by incorporating pH-sensitive 3-oxindole derivative dyes that can dynamically change color in response to pH conditions. These dyes transition from yellow/red form at low pH to blue form at high pH, enabling the textile to adapt its color state based on environmental conditions rather than maintaining a fixed color
Solution Approach 2:
The patent applies parameter changes by utilizing dyes whose color properties change in response to pH parameter variations. The 3-oxindole derivatives exhibit different molecular structures and colors at different pH levels, allowing the textile to respond to chemical environment changes through controlled parameter shifts
2Adaptability or versatility
If irreversible color changeable dyes are used, then the color can change under specific conditions, but the color change cannot be reversed or repeated
Solution Approach 1:
The patent applies periodic action by using pH-sensitive dyes that can undergo repeated cycles of color change. The textile can be washed alternately with acidic and basic solutions, causing the dye to reversibly switch between yellow/red and blue colors multiple times, enabling repeatable customization rather than single-use color change
3Adaptability or versatility
If pH-sensitive dyes are developed for reversible color change, then the textiles can be customized by users, but new compounds and synthesis processes must be created
Solution Approach 1:
The patent applies preliminary action by pre-synthesizing the pH-sensitive 3-oxindole derivative dyes with specific molecular structures before applying them to textiles. The dyes are prepared in advance through controlled chemical synthesis reactions, allowing them to be incorporated into conventional textile dyeing processes without requiring complex on-demand synthesis equipment
Solution Approach 2:
The patent applies intermediary by using 3-oxindole derivatives as intermediary compounds that bridge conventional textile dyeing processes and pH-sensitive color change functionality. These derivative compounds serve as mediators that can be integrated into existing textile manufacturing workflows while providing the desired reversible color change properties
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
Enables the creation of pH-sensitive textiles that can change color reversibly in response to pH levels, allowing for customizable and repeatable color modifications, providing users with the ability to alter the color of textiles by washing with acidic or basic solutions.
Implementation Method 1
novel 3-oxindole derivatives that can be used as pH-sensitive dyes, synthesized by reacting t-Boc-protected indigo with sodium amide, allowing for reversible color changes from yellow/red to blue upon alkali washing and back to yellow/red with acidic treatments
Data Source
AI summary
The present invention relates to novel 3-oxindole derivatives, to a process for their preparation and to the use of said derivatives as dyes for manufacturing pH sensitive textiles and as indicators in titration methods. The invention also relates to a method to manufacture pH sensitive textiles and to textiles so obtained.