Aqueous Dye Solution Formulation for Odorless Low-Viscosity Paper Dyeing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Concentrated aqueous solutions of dyes for paper dyeing require stability during storage and pumping, but existing solutions with benzyl alcohol suffer from odor issues and suboptimal flow properties, while alternatives like urea and glycols result in high viscosities.
Innovation Solution
The use of 1-phenoxy-2-propanol as a formulating aid in concentrations of 0.1 to 10% by weight, combined with anionic or cationic direct dyes, inorganic or organic acids, and optional additives, creates odorless, stable, and superior-flow dye solutions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If benzyl alcohol is used as a formulating aid, then storage stability is improved, but odor becomes problematic
Solution Approach 1:
The patent substitutes benzyl alcohol with 1-phenoxy-2-propanol, changing the chemical parameter of the formulating aid while maintaining the required storage stability function. This parameter change eliminates the odor problem while preserving the stability benefit.
Solution Approach 2:
The patent replaces the problematic benzyl alcohol with an alternative substance (1-phenoxy-2-propanol) that achieves the same functional purpose without the harmful odor characteristic, effectively discarding the harmful aspect while retaining the useful function.
2Reliability
If urea or glycols are used as formulating aids, then storage stability is improved, but viscosity increases
Solution Approach 1:
The patent changes the chemical parameter of the formulating aid from urea or glycols to 1-phenoxy-2-propanol, which maintains storage stability while avoiding the high viscosity problem associated with the alternative substances.
Solution Approach 2:
The patent introduces 1-phenoxy-2-propanol as an intermediary substance that mediates between the requirement for storage stability and the need for low viscosity, achieving a balance that the other substances cannot provide.
3Productivity
If concentrated aqueous solutions are used, then productivity is improved, but pumpability at low temperatures deteriorates
Solution Approach 1:
The patent uses 1-phenoxy-2-propanol to modify the physical parameters of the concentrated aqueous dye solution, specifically lowering its freezing point and maintaining fluidity at low temperatures, thereby preserving pumpability while keeping the solution concentrated for high productivity.
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 are stable over long periods, exhibit improved flow properties, and are free from the odor issues associated with benzyl alcohol, maintaining stability and pumpability even at low temperatures.
Implementation Method 1
concentrated aqueous solutions of direct dyes... by addition of up to 4% of benzyl alcohol... use of 1-phenoxy-2-propanol as a formulating aid provides odorless formulations... which are stable to storage
Implementation Method 2
superior in their flow properties to those formulations disclosed in the prior art... readily pumpable, even at relatively low temperatures
Data Source
AI summary
The invention relates to an aqueous dye solution comprising a) 5 to 30% by weight of an anionic or cationic direct dye, b) 0.1 to 10% by weight of 1-phenoxy-2-propanol, c) 0 to 20% by weight of an inorganic or an organic acid, d) 0 to 20% by weight of further additives and e) water to complete to 100%, a process for the preparation of the solution and the use thereof for dyeing paper.