Inkjet textile printing ink
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Solution Overview
Problem
Existing inkjet textile printing inks face challenges in achieving both excellent ejection stability and washing fastness, as they often suffer from dye elution during washing due to the exposure of dyes on the surface of pigment particles and instability of polymers with non-ring-opened oxazoline groups.
Innovation Solution
The development of an inkjet textile printing ink with core-shell structured coloring particles, where the core contains a polyester resin and a dye, and the shell layer is formed with a specific resin having a non-ring-opened oxazoline group and an amide ester group, enhancing adhesion and preventing agglomeration, thereby improving ejection stability and washing fastness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If dyes are exposed on the surface of pigment particles, then coloring efficiency is improved, but washing fastness deteriorates due to dye elution
Solution Approach 1:
The pigment particles are designed with heterogeneous surface composition: hydrophobic regions for dye attachment and hydrophilic regions for water repulsion. This local differentiation allows the dye to be firmly anchored on the particle surface while the hydrophilic portions prevent water from penetrating and extracting the dye during washing, thus achieving both coloring efficiency and washing fastness
Solution Approach 2:
The pigment particles are constructed as composite structures combining hydrophobic dye-binding regions and hydrophilic water-resistant regions. This composite material approach enables the particle to simultaneously perform dye fixation and anti-elution functions, resolving the contradiction between coloring efficiency and washing fastness
2Reliability
If polymers with non-ring-opened oxazoline groups are used, then adhesion to textile is improved, but ejection stability deteriorates due to polymer agglomeration
Solution Approach 1:
The polymer structure is designed with local differentiation: non-ring-opened oxazoline groups are positioned at specific sites to provide adhesion functionality, while other portions of the polymer chain maintain hydrophilicity and steric hindrance to prevent agglomeration. This localized functional distribution enables the polymer to adhere to textile without sacrificing ejection stability
Solution Approach 2:
The molecular weight, composition ratio, and structural parameters of the polymer are precisely controlled to balance adhesion and stability. By adjusting these parameters, the polymer achieves sufficient adhesion through non-ring-opened oxazoline groups while maintaining adequate solubility and preventing agglomeration during inkjet ejection
3Reliability
If shell layer is added to cover core, then washing fastness is improved by preventing dye elution, but device complexity increases
Solution Approach 1:
Instead of creating a complete core-shell structure, the invention applies local quality modification by forming a shell layer only at specific regions of the pigment particle surface where dye attachment occurs. This partial shell formation prevents dye elution while avoiding the complexity of fully encapsulating the core particle
Solution Approach 2:
The shell layer is applied partially rather than completely covering the core particle. This partial action approach provides sufficient protection against dye elution to achieve washing fastness while minimizing the added structural complexity and material requirements compared to full shell encapsulation
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 ink exhibits improved ejection stability and forms textile prints with excellent washing fastness, as the core-shell structure prevents dye elution and the non-ring-opened oxazoline group forms covalent bonds with the textile target, ensuring durable adhesion and resistance to washing.
Implementation Method 1
the non-ring-opened oxazoline group forms covalent bonds with the textile target, ensuring durable adhesion
Implementation Method 2
the core-shell structure prevents dye elution
Data Source
AI summary
An inkjet textile printing ink includes coloring particles and an aqueous medium. The coloring particles each include a core and a shell layer covering the core. The core contains a polyester resin and a dye. The shell layer contains a specific resin with a non-ring-opened oxazoline group and an amide ester group. The polyester resin preferably includes a non-crystalline polyester resin.