Composite Dispersant for Dyes Resolving Foam and Viscosity
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Solution Overview
Problem
Existing dispersants for disperse dyes and pigments are inefficient in achieving quick dispersion and stability, often requiring high quantities and causing issues like high viscosity and foam formation, with limited effectiveness across different dye and pigment types.
Innovation Solution
A dispersant composition comprising acetylenic surfactants, nonionic aryl phenol compounds, and anionic aryl phenol compounds, which enables efficient dispersion and stability in small additive quantities, improving wettability and defoamability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a nonionic surfactant including an acetylene group is used as a dispersant, then penetrability and anti-foamability of ink are improved, but dispersing performance deteriorates and dispersion time increases
Solution Approach 1:
The patent uses a composite dispersant system combining nonionic surfactant (acetylene glycol or ethoxylated acetylene glycol) with aryl phenol compound and carboxylic acid. This composite approach leverages the foam-control capability of the acetylenic surfactant while the aryl phenol and carboxylic acid components provide rapid dispersion performance, resolving the contradiction between anti-foamability and dispersing speed
2Productivity
If polymeric dispersants are used, then dispersing performance is improved, but dispersion viscosity increases and preparation becomes difficult
Solution Approach 1:
The patent changes the molecular weight parameter of the dispersant components, using low-molecular-weight compounds (aryl phenol with 6-20 carbons, carboxylic acid with 2-10 carbons) instead of high-molecular-weight polymers. This parameter change maintains dispersing performance while significantly reducing dispersion viscosity and simplifying preparation
3Productivity
If polymeric dispersants are used, then dispersing performance is improved, but ink composition dries easily
Solution Approach 1:
The patent changes the molecular weight and functional group parameters of the dispersant, using small-molecule compounds with specific functional groups (aryl phenol and carboxylic acid) instead of large polymers. This provides adequate dispersing performance while maintaining better ink stability and preventing excessive drying
4Productivity
If a large quantity of dispersant is added to achieve good dispersion, then dispersing performance is improved, but foam formation increases
Solution Approach 1:
The patent employs a composite dispersant system where the nonionic acetylenic surfactant component specifically targets foam suppression while the aryl phenol and carboxylic acid components provide dispersion power. This functional division allows achieving good dispersing performance with reduced total dispersant quantity and minimized foam formation
5Object-generated harmful factors
If dispersant quantity is reduced, then foam formation is reduced, but dispersing performance deteriorates
Solution Approach 1:
The composite dispersant system allows each component to contribute its strength: the acetylenic surfactant controls foam at low concentrations while the aryl phenol and carboxylic acid provide efficient dispersion. This synergistic combination breaks the trade-off between foam reduction and dispersing performance
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 dispersant achieves rapid dispersion and excellent stability for various disperse dyes and pigments, maintaining performance over time and reducing viscosity and foam issues.
Implementation Method 1
Nonionic surfactants, anionic surfactants, and polymer surfactants have been proposed as examples of such dispersants. a nonionic surfactant including an acetylene group is useful as a pigment dispersant
Data Source
AI summary
A dispersant, a dispersion and an ink composition including the dispersant, and a method of preparing the dispersion and the ink composition, in which the dispersant includes: (A) 0.5 to 30% by weight of a compound selected from at least one of acetylene glycol represented by the specific formula (1) and an ethoxylated substance of acetylene glycol represented by the specific formula (2); (B) 5 to 98% by weight of a nonionic aryl phenol compound represented by the specific formula (3); and (C) 1 to 70% by weight of an anionic aryl phenol compound represented by the specific formula (4), and wherein the total amount of components (A) to (C) is 100% by weight.