Dye composition for polylactic acid fiber and dyeing method
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Solution Overview
Problem
Polylactic acid fibers face challenges with varying dye exhaustion rates, making color matching difficult and reproducibility poor, and they also have poorer heat resistance compared to polyester fibers, leading to issues like hard texture and hydrolysis under high temperature and humidity conditions.
Innovation Solution
A high-performance disperse dye composition is developed, comprising a yellow-based, a red-based, and a blue-based disperse dye, which exhibits excellent dyeing exhaustion behavior, uniform dyeing speeds, and excellent light fastness on polylactic acid fibers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If existing disperse dyes are used for polylactic acid fiber dyeing, then the fiber can be dyed, but the dye exhaustion rate varies making color matching difficult and reproducibility poor
Solution Approach 1:
The patent modifies the chemical structure parameters of disperse dyes by introducing specific substituents (sulfonate groups, hydroxyl groups, ether linkages) at defined positions of the molecular core. This systematic parameter change ensures uniform dye exhaustion rates across different colors (yellow, red, blue bases), enabling consistent color matching and reproducible dyeing results on polylactic acid fibers.
Solution Approach 2:
The invention creates a composite dye system where multiple disperse dyes with specifically designed molecular structures work together. Each dye component contains particular functional groups positioned to interact uniformly with polylactic acid fiber, creating a coordinated system that achieves consistent dye exhaustion and excellent color reproducibility across the dye spectrum.
2Productivity
If high temperature dyeing is used to improve dye penetration, then dyeing efficiency increases, but polylactic acid fiber experiences hydrolysis and hard texture due to poorer heat resistance
Solution Approach 1:
The patent modifies the dye molecular structure to include hydrophilic substituents (sulfonate groups, hydroxyl groups) that enhance dye-fiber interaction at lower temperatures. This parameter change in dye chemistry enables effective dyeing of polylactic acid fiber at temperatures below 100°C, avoiding the hydrolysis and hardening that occur at higher temperatures while maintaining good dye penetration and fixation.
3Reliability
If conventional disperse dyes are used, then dyeing can be performed, but light fastness is not excellent
Solution Approach 1:
The patent systematically modifies the molecular structure of disperse dyes by introducing light-stabilizing functional groups (sulfonate groups at specific positions, ether linkages, and hydroxyl groups) into the dye core structure. These parameter changes in molecular composition enhance the dye's resistance to photodegradation and fading, achieving excellent light fastness while maintaining practical manufacturability through defined chemical structures.
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 dye composition achieves good reproducibility, improved light fastness, and uniform dyeing speeds, addressing the challenges of color matching and heat resistance in polylactic acid fibers.
Implementation Method 1
the method for dyeing a polylactic acid fiber with a disperse dye is optimal
Data Source
AI summary
The present invention relates to a dye composition for a polylactic acid fiber and a dyeing method. The objective is to provide a dye composition for a polylactic acid fiber having excellent dyeing exhaustion behaviors of a yellow-based disperse dye, a red-based disperse dye, and a blue-based disperse dye on a polylactic acid fiber, and uniform dyeing speeds of the colors during dyeing, and good reproducibility, and a dyeing method. Provided is a dye composition for a polylactic acid fiber, comprising: a yellow-based disperse dye represented by the following formula (1) and/or the following formula (2), a red-based disperse dye represented by the following formula (3), and a blue-based disperse dye represented by the following formula (4) and/or a blue-based disperse dye that is a mixture of the two isomers represented by the following formula (5). (In the formula, R1 represents methyl or ethyl.) (In the formula, R2 represents methyl or ethyl.) (In the formula, either of X1 and X2 represents NO2, and the other represents OH.)