Pretreatment liquid and image forming method
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Solution Overview
Problem
Existing textile printing methods using disperse dyes struggle to achieve high color developing density and friction fastness on fabrics with hydrophilic fibers due to low affinity between solvents and dyes, leading to inadequate dye penetration and fixation.
Innovation Solution
A pretreatment liquid with a solvent having an I/O value of 1.0 to 3.0 and a surface tension of less than 38 mN/m is used, enhancing dye penetration and carrier properties to improve color developing density and friction fastness by swelling the fibers and facilitating dye entry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a pretreatment liquid with high surface tension is used to swell fabric fibers, then fiber swelling is achieved, but the liquid cannot penetrate the fabric effectively and dye entry is blocked
Solution Approach 1:
The patent applies parameter changes by precisely controlling the surface tension of the pretreatment liquid to be 38 mN/m or less at 25°C, and selecting solvents with specific I/O values (1.0 to 3.0). This parameter optimization enables the liquid to simultaneously achieve fabric penetration and fiber swelling, resolving the contradiction between penetration ability and swelling effect.
2Volume of moving object
If a solvent with low affinity to disperse dye is used in pretreatment liquid, then fabric swelling is achieved, but friction fastness is insufficient
Solution Approach 1:
The patent resolves this contradiction by changing the chemical parameter of the solvent, specifically selecting solvents with I/O values between 1.0 and 3.0. This parameter range ensures both adequate fabric swelling and sufficient affinity with disperse dye, thereby achieving both swelling effect and friction fastness simultaneously.
3Volume of moving object
If a pretreatment liquid with high surface tension is used, then fiber swelling is achieved, but dye penetration into fibers is insufficient resulting in low color developing density
Solution Approach 1:
The patent applies parameter changes by optimizing surface tension to 38 mN/m or less and selecting solvents with I/O values of 1.0 to 3.0. These parameter adjustments enable the pretreatment liquid to penetrate fibers effectively while maintaining fiber swelling, resulting in adequate dye entry and high color developing density.
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 proposed solution effectively increases color developing density and friction fastness on hydrophilic fibers by ensuring better dye penetration and reduced surface dye retention, resulting in enhanced image quality.
Implementation Method 1
a fabric is swollen with a swelling agent
Implementation Method 2
permeation of the disperse dye into the fabric
Implementation Method 3
has a surface tension of less than 38 mN/m at 25° C.
Implementation Method 4
it is difficult for the disperse dye to enter a fiber of the pretreated fabric
Data Source
AI summary
A pretreatment liquid for a fabric used for transfer textile printing, includes a solvent having an organic/inorganic value (I/O value) of 1.0 to 3.0, and has a surface tension of less than 38 mN/m at 25° C.