Core-Shell Polymer Composition for Enhanced Dye Fastness on Cotton
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Solution Overview
Problem
The textile industry faces challenges in providing dye compositions with desirable fastness and strength properties, particularly for cotton substrates, where fluorescent dyes and UV brighteners have limited availability and poor light and wash fastness, leading to higher costs and quality issues with pigments.
Innovation Solution
A polymer composition with a core-shell structure, comprising specific monomers and a shell polymer with active ingredients, is developed, which includes structural units from monomers like styrene, acrylonitrile, and hydroxyethyl methacrylate, and a process for forming this composition that involves heating, cooling, and homogenization steps to create a stable dispersion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If fluorescent dyes and UV brighteners are used for cotton substrates, then color brightness and fluorescence are improved, but light fastness and wash fastness deteriorate
Solution Approach 1:
The patent uses a core-shell polymer structure where the core provides mechanical strength and the shell contains fluorescent and UV-absorbing units. This composite structure combines the brightness benefits of fluorescent materials with the durability of a protective polymer matrix, resolving the contradiction between color brightness and light fastness.
Solution Approach 2:
The patent creates different functional zones within the polymer particles: the core provides structural stability while the shell contains the fluorescent and UV-absorbing chromophores. This local differentiation allows bright colors in the shell while the core maintains fastness properties.
2Illumination intensity
If fluorescent dyes and UV brighteners are used for cotton substrates, then color brightness and fluorescence are improved, but wash fastness deteriorates
Solution Approach 1:
The polymer composite structure embeds fluorescent and UV-absorbing units within a durable polymer matrix (acrylonitrile-styrene-acrylic acid copolymer). This composite approach maintains color brightness while the polymer matrix provides resistance to washing, resolving the wash fastness issue.
Solution Approach 2:
The shell polymer contains the fluorescent and UV-absorbing chromophores in a localized manner within a wash-resistant polymer matrix, allowing bright colors to be maintained while the surrounding polymer structure protects against washing degradation.
3Reliability
If pigments are used instead of fluorescent dyes on cotton, then color palette and fastness are improved, but application cost and process complexity increase
Solution Approach 1:
The polymer particles serve multiple functions simultaneously: they act as color carriers, UV protectors, and binders in one material system. This multi-functionality eliminates the need for separate pigment application and binding processes, reducing process complexity while maintaining fastness.
Solution Approach 2:
The patent combines fluorescent dyes, UV absorbers, and polymer binder into a single integrated polymer particle system. This merging of previously separate components (pigments, binders, UV protectors) into one material simplifies the application process while maintaining color fastness.
4Reliability
If a core-shell polymer structure with specific monomer ratios is used, then wash and light fastness are improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent specifies precise parameter ranges for monomer ratios (e.g., acrylic acid 2-20%, styrene 40-80%, acrylonitrile 10-40%) rather than exact values. This parameter approach provides manufacturing flexibility while ensuring fastness performance, reducing the stringency of precision requirements.
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 polymer composition enhances wash and light fastness properties, offering improved color strength and stability, making it suitable for various substrates including cotton, while being cost-effective and efficient.
Implementation Method 1
UV-absorbing structural units
Implementation Method 2
fluorescent structural units
Data Source
AI summary
A polymer composition is provided. The polymer composition includes (i) a core polymer; and (ii) a shell polymer formed over the core polymer. The core polymer includes structural units derived from monomers having a Formula I, Formula II, Formula V (optional), and Formula VI:and a structural unit derived from a monomer selected from a group consisting of monomers having a Formula III and Formula IV:The shell polymer includes an active ingredient, a polymer comprising structural units derived from a monomer having Formula, I, Formula II, and Formula VI:and a structural unit derived from a monomer selected from a group consisting of monomers having a Formula III and Formula IV.