Polycarboxylate Ether Dispersants for Stable UV Absorber Suspensions
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Solution Overview
Problem
Existing dispersants for insoluble or sparingly soluble UV absorbers and disperse dyes in the textile industry, particularly for polyester fibers, face challenges in maintaining effective dispersion and stability, which affects their application and performance.
Innovation Solution
The use of polycarboxylate ethers as dispersants for UV absorbers and disperse dyes, which are polymeric compounds based on acrylic or methacrylic acid esterified with polyether glycols, helps in maintaining these substances in a fine state of subdivision, enhancing their dispersion and stability in aqueous solutions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional dispersants are used for UV absorbers and disperse dyes, then the products can be applied to textile materials, but the dispersion stability and fine state of subdivision are insufficient
Solution Approach 1:
The patent changes the chemical structure parameters of the dispersant by using polycarboxylate ethers with specific molecular weights (5,000-50,000) and polyether glycol chain lengths. This structural parameter change enables the dispersant to achieve both fine particle size control (0.2-5 µm) and stable dispersion of UV absorbers and disperse dyes on polyester fibers.
Solution Approach 2:
The invention uses composite chemical structures combining polycarboxylate backbones with polyether glycol side chains. This composite structure provides both the carboxylate groups for binding to dye particles and the polyether chains for steric stabilization, achieving superior dispersion stability and particle size control compared to single-function dispersants.
2Manufacturing precision
If dispersants are added to maintain fine subdivision, then particle size is reduced, but formulation complexity increases
Solution Approach 1:
The polycarboxylate ether dispersant performs multiple functions simultaneously: it disperses both UV absorbers and disperse dyes, controls particle size to 0.2-5 µm, provides storage stability, and facilitates application to polyester fibers. This multi-functionality reduces the need for multiple separate additives, simplifying the overall formulation despite the sophisticated performance requirements.
3Stability of the object's composition
If polycarboxylate ethers are used as dispersants, then dispersion quality improves, but cost of auxiliaries increases
Solution Approach 1:
The patent employs polycarboxylate ethers at relatively low concentrations (0.1-10% of total formulation weight) to achieve effective dispersion. While the dispersant itself may be expensive, the low required dosage and the elimination of need for multiple separate dispersing agents result in overall cost-effective formulations with superior 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
Polycarboxylate ethers effectively disperse UV absorbers and disperse dyes, achieving particle sizes of 0.2 to 5 µm, with preferred weight percentages, and improve the stability and performance of formulations, making them suitable for textile dyeing and finishing applications.
Implementation Method 1
preparations, i.e., storage-stable formulations for the trade for example, and also treatment liquors and baths obtained therefrom, have to contain dispersants which keep these products in a fine state of subdivision
Implementation Method 2
Polycarboxylate ethers (PCEs) are polymeric compounds based essentially on acrylic acid or methacrylic acid and esterified with polyether glycols. These compounds are known and are used as concrete superplasticizers
Implementation Method 3
Polycarboxylate ethers are very useful for dispersing UV absorbers or disperse dyes and UV absorbers
Data Source
AI summary
The present invention relates to the use of polycarboxylate ethers for dispersing disperse dyes and UV absorbers and also to preparations comprising a disperse dye and/or a UV absorber and a polycarboxylate ether as a dispersant.