Stable Anionic Dye Solutions for Industrial Printing
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Solution Overview
Problem
Conventional aqueous dye solutions for industrial dyeing and printing are prone to precipitation during storage and transportation, causing disruptions in metering and pumping systems, and require costly dissolving operations, which affects their stability and usability.
Innovation Solution
Development of concentrated storage-stable aqueous dye solutions comprising anionic disazo dyes with specific radical and bridging phenyl group structures, along with water-soluble organic solubilizers and biocides, which are stable at varying temperatures and remain homogeneous during storage and use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If concentrated aqueous dye solutions are used for industrial dyeing and printing, then dissolution operations are eliminated and dusting is prevented, but precipitation occurs during storage and transportation
Solution Approach 1:
The patent introduces water-soluble organic solubilizers (such as polyethylene glycol, polypropylene glycol, or their esters) as intermediary substances that mediate between the dye and water. These solubilizers form mixed micelles or solvation complexes with the anionic disazo dyes, enhancing the dye's solubility and preventing precipitation during storage and transportation while maintaining the convenience of liquid formulation.
2Reliability
If stable dye solutions are required for metering systems, then precipitation is avoided, but the solutions require specific compositional constraints
Solution Approach 1:
The patent optimizes specific compositional parameters to achieve stability: controlling the dye concentration at 1-50% by weight, the solubilizer content at 1-40% by weight, and adjusting the pH to 2-10. These parameter changes ensure the solution remains stable in metering systems without requiring complex additional components, balancing reliability with compositional simplicity.
3Duration of action of stationary object
If frozen solutions are to be stored, then long-term stability is achieved, but viscosity increases and pumping becomes difficult
Solution Approach 1:
The patent selects solubilizers with specific molecular weight ranges and chemical structures (such as polyethylene glycol with molecular weight 200-10,000 or polypropylene glycol with molecular weight 200-10,000) that modify the freezing behavior of the solution. These parameter changes allow the solution to form a stable frozen state for long-term storage while maintaining sufficient fluidity after thawing to enable easy pumping and processing.
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 solutions exhibit excellent stability, low viscosity, and remain stable after freezing and thawing, ensuring uninterrupted operation of metering systems and enabling efficient dyeing and printing processes without precipitation, even at low temperatures.
Implementation Method 1
concentrated storage-stable aqueous dye solutions comprising anionic disazo dyes
Implementation Method 2
comprising salts and or the free acids of anionic dyes of the formula... and biocides
Data Source
AI summary
The present invention concerns concentrated aqueous solutions of anionic disazo dyes, comprising salts and or the free acids of anionic dyes of the formulaand 2-(2-butoxyethoxy) ethanol wherein the substituents are each as defined in claim 1 and the use of these solutions for dyeing and/or printing hydroxyl-containing substrates and for producing inkjet inks.