Dual-Dispersant UV Absorber Dispersion for Uniform Static Dyeing
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Solution Overview
Problem
The static dyeing process experiences differential pressure issues due to the inclusion of UV absorber preparations containing benzotriazoles, benzotriazines, and benzophenones, leading to uneven dye deposition and faulty dyeing, especially with finer fibers and higher substrate densities.
Innovation Solution
A mixture of at least two different dispersants, comprising 75-95% of a specific compound and 5-25% of a formaldehyde condensation product, is combined with UV absorbers to reduce differential pressure, along with an aqueous dispersion containing 5-40% UV absorbers and 5-30% dispersants, which are used in conjunction with stabilizing agents to enhance dyeing uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UV absorber preparations containing benzotriazoles, benzotriazines, and benzophenones are included in the static dyeing process, then textiles are protected from ultraviolet light damage, but differential pressure increases causing uneven dye deposition
Solution Approach 1:
A dispersing agent mixture comprising a polyether carboxylic acid component and a formaldehyde condensation product of aromatic sulfonic acid is introduced as an intermediary substance. This mixture mediates between the UV absorbers and the dyeing system, preventing the harmful interaction that causes differential pressure while maintaining UV protection functionality
Solution Approach 2:
The patent changes the chemical composition parameters of the dispersing system by using a specific mixture of two dispersing agents with defined weight ratios (75-95% component A and 5-25% component B). This parameter change transforms the dyeing system from one that generates differential pressure to one that maintains uniform pressure and even dye deposition
2Manufacturing precision
If the dye bath temperature is elevated to transport dyes into the fiber, then dye exhaustion is achieved, but the pressure differential increases causing uneven circulation
Solution Approach 1:
The dispersing agent mixture acts as a thermal intermediary that stabilizes pressure conditions during temperature elevation. It enables the dye bath to undergo necessary temperature increases for dye exhaustion while maintaining uniform pressure distribution throughout the circulation system
Solution Approach 2:
The patent modifies the chemical environment parameters by introducing the dispersing agent mixture, which changes the physical-chemical properties of the dye bath. This allows the system to tolerate higher temperatures without generating harmful pressure differentials, thus achieving both dye exhaustion and pressure stability
3Ease of operation
If dispersants commonly used for synthetic fibers are applied, then dyeing process is facilitated, but differential pressure problems worsen with certain UV absorbers and dyes
Solution Approach 1:
The patent creates a composite dispersing system by combining two different dispersing agents (polyether carboxylic acid component and formaldehyde condensation product) in specific proportions. This composite approach provides the benefits of facilitation while eliminating the harmful differential pressure effects that occur with conventional single dispersants
Solution Approach 2:
The invention changes the compositional parameters of the dispersing system from conventional single-agent formulations to a dual-component mixture with specific weight ratios. This parameter change transforms the interaction between dispersants, UV absorbers, and dyes, eliminating differential pressure while maintaining process facilitation
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 solution significantly reduces or eliminates differential pressure, ensuring uniform dyeing and improving light and rub fastness on synthetic fibers, particularly polyester, with stable dispersions maintaining effectiveness up to 130°C.
Implementation Method 1
the differential pressure can be substantially reduced or even eliminated when a specific mixture of at least two different dispersants is combined with UV absorbers
Implementation Method 2
preparations, containing benzotriazoles, substituted benzotriazoles, benzotriazines, or benzophenones as the active agents, are used to protect textiles from the damaging effects of ultraviolet light
Data Source
AI summary
The present invention relates to a mixture of at least two different dispersing agents, an aqueous dispersion containing a UV absorber selected from benzotriazoles, benzotriazines and benzophenones and a mixture of at least two different dispersing agents and a method for reducing the differential pressure in the static dyeing process.