Latex Dye Sublimation Inks for Natural Fabric Adhesion
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Solution Overview
Problem
Dye sublimation inks are not suitable for printing on natural fibers like cotton, wool, and silk due to poor adhesion and colorfastness issues, leading to bleeding and reduced color density during laundering.
Innovation Solution
Development of dye sublimation inks containing latex that create a polymeric layer for better adhesion to natural fibers, allowing for printing on both natural and synthetic fabrics with improved color density and washability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If dye sublimation inks are used for printing on natural fiber fabrics, then color density and adhesion are improved, but the inks are not suitable for printing on natural fibers because the dyes penetrate and do not adhere to the natural fibers
Solution Approach 1:
The patent introduces a binder polymer as an intermediary substance between the disperse dye and the natural fiber substrate. The binder polymer contains functional groups that can interact with both the dye molecules and the hydroxyl groups on natural fiber surfaces, creating a bridging mechanism that enables adhesion. This resolves the contradiction by providing a mediating layer that facilitates bonding without requiring the dye to directly penetrate and adhere to the fiber, thus improving both adhesion strength and colorfastness reliability
Solution Approach 2:
The patent creates a composite ink formulation combining disperse dye molecules with binder polymer in a specific ratio (0.1-10 wt% binder polymer). This composite material allows the ink to function differently on different substrates: on synthetic fibers, the disperse dye penetrates as usual, while on natural fibers, the binder polymer forms a polymeric layer that enables adhesion. This composite approach resolves the contradiction by allowing the same ink composition to achieve reliable adhesion and colorfastness on natural fibers while maintaining compatibility with synthetic fibers
2Adaptability or versatility
If a single ink composition is used for both natural and synthetic fabrics, then versatility is improved, but previously inks were only suitable for synthetic fabrics due to hydrophobic properties
Solution Approach 1:
The patent designs a universal ink formulation that can function on both hydrophobic synthetic fibers and hydrophilic natural fibers by incorporating binder polymer with dual functionality. The binder polymer contains hydrophobic regions that interact with synthetic fiber surfaces and hydrophilic functional groups that interact with natural fiber hydroxyl groups. This multi-functional binder enables a single ink composition to achieve reliable adhesion across different fiber types, resolving the contradiction between versatility and adhesion strength
Solution Approach 2:
The patent modifies the chemical parameters of the ink formulation by adding binder polymer with specific functional groups (carboxyl, hydroxyl, or amino groups) that can change their interaction mode depending on the substrate. On synthetic fibers, the hydrophobic portions dominate, while on natural fibers, the hydrophilic functional groups form hydrogen bonds with fiber hydroxyl groups. This parameter-based adaptability allows the same ink to achieve strong adhesion on both fiber types, resolving the versatility-adhesion contradiction
3Quantity of substance
If dye sublimation inks penetrate natural fibers completely, then absorption is improved, but adhesion deteriorates because the dyes do not adhere to the natural fibers
Solution Approach 1:
The binder polymer acts as an intermediary that captures dye molecules through absorption while simultaneously providing adhesion sites through its functional groups. The binder polymer forms a polymeric layer that traps dye molecules within its matrix, preventing complete penetration through the fiber, while the functional groups on the binder polymer form hydrogen bonds with hydroxyl groups on the natural fiber surface. This intermediary mechanism resolves the contradiction by enabling absorption without complete penetration, maintaining both quantity of dye retained and adhesion strength
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 use of latex-based dye sublimation inks enables printing on natural fibers with enhanced colorfastness and versatility, allowing for a single ink composition to work on both natural and synthetic fabrics, improving color density and wash resistance.
Implementation Method 1
the dyes penetrate and do not adhere to the natural fibers
Implementation Method 2
a polymeric layer that the dye can absorb into and better adhere to the fabric
Implementation Method 3
dye sublimation printing process
Implementation Method 4
transfer the image to the fabric using a heat press
Data Source
AI summary
Provided are dye sublimation ink compositions, methods of preparing dye sublimation ink compositions, and methods of printing with dye sublimation ink compositions. Methods of printing with dye sublimation ink compositions includes printing on natural fabrics. Dye sublimation ink compositions comprise one or more latexes; a humectant composition; a surfactant composition; a biocide composition; a buffer composition; and a solvent.