Reactive Dye Composition for Digital Printing Light Fastness
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Solution Overview
Problem
Current light color printed products with high sunlight characteristics have low light fastness, typically grade 2 or 1, and rely on metal complex dyes, which is not environmentally friendly, necessitating a solution for high light fastness without metal complexes.
Innovation Solution
A reactive dye composition combining a red reactive dye with blue and/or orange reactive dyes, along with an organic buffer, achieving light fastness of 4 to 5 or above on the AATCC gray scale when formulated into ink or printing paste for digital printing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal complex dyes are used to achieve high light fastness in light color printed products, then light fastness is improved, but environmental friendliness deteriorates
Solution Approach 1:
The patent extracts and eliminates metal complex components from the dye formulation by using a combination of reactive red dye, reactive blue dye, and reactive orange dye. This removes the harmful metal elements (cobalt, chromium, copper) while maintaining the light fastness performance through the synergistic effect of the organic dye combination.
Solution Approach 2:
The patent creates a composite dye system by combining multiple reactive dyes (red, blue, and orange) in specific ratios. This composite approach achieves the light fastness previously only available from metal complex dyes, while using environmentally friendly organic dye components throughout the composition.
2Ease of manufacture
If conventional reactive dyes are used for light color printing, then ease of manufacture is improved, but light fastness deteriorates
Solution Approach 1:
The patent develops a composite reactive dye composition combining red, blue, and orange reactive dyes with an organic buffer. This composite formulation maintains the ease of use and application of conventional reactive dyes while achieving superior light fastness (grade 4-5) that conventional single dyes cannot provide.
Solution Approach 2:
The patent optimizes the concentration ratios of the three reactive dyes and incorporates an organic buffer to control pH parameters. This parameter optimization enables the dye composition to achieve high light fastness while maintaining the simple application process characteristic of conventional reactive dyes.
3Reliability
If dark products with high dye concentration are used, then light fastness is improved, but adaptability to light color applications deteriorates
Solution Approach 1:
The patent creates a dye composition specifically optimized for light color applications by formulating with reactive dyes at concentrations and ratios suitable for light shades. The composition achieves grade 4-5 light fastness specifically in the light color range, rather than relying on high concentration dark dyeing.
Solution Approach 2:
The patent formulates a composite dye system where the combination of red, blue, and orange reactive dyes creates a synergistic effect that provides exceptional light fastness in light color applications. This composite approach enables adaptability to light color markets while maintaining high reliability in light fastness performance.
Data Source
AI summary
A reactive dye composition is provided, which comprises: a red reactive dye represented by the following formula (I), and at least one reactive dye selected from the group consisting of a blue reactive dye represented by the following formula (II) and an orange reactive dye represented by the following formula (III); and an organic buffer. In addition, the aforesaid reactive dye composition can be used to prepare an ink for digital printing. Herein, R1, R2, R3, R4 and n are defined in the specification.