Cationizing agent, method for firmly fixing water-insoluble particles, and method for producing dyed material
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Solution Overview
Problem
Existing methods for dyeing fibers and fabrics with water-insoluble pigments face challenges in achieving deep-color processing and washing fastness due to the pigments' inability to penetrate and firmly attach to the fabric, especially with suede-like and aramid fibers.
Innovation Solution
A cationizing agent comprising a polymer with constituent units derived from vinylamine monomers, specifically a hydrolysate of N-vinylamide polymers, is used to cationize the fabric, allowing for efficient fixation of water-insoluble particles like pigments by altering the fabric's surface properties to enhance attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If water-insoluble pigments are used for dyeing, then the pigments hardly fade and characteristic texture is obtained, but the pigments mostly adhere to the surface and do not penetrate into the fibers, making it difficult to firmly attach in a great amount
Solution Approach 1:
The patent introduces a cationic polymer as an intermediary substance that mediates between the negatively charged fabric surface and the water-insoluble pigment particles. The polymer's cationic groups bind to the fabric surface while its structure facilitates pigment attachment, enabling deep penetration and firm fixation of pigments without requiring excessive binder usage
2Reliability
If binders are used to improve washing fastness by firmly fixing pigments, then the fixation efficiency improves, but using binders in abundance inhibits the flexibility of the fibers
Solution Approach 1:
The patent changes the chemical parameter of the polymer from conventional binders to a specific cationic polymer with controlled charge density and molecular structure. This parameter change allows the polymer to provide effective pigment fixation while maintaining fiber flexibility, as the cationic polymer binds to the fabric surface without forming rigid cross-links that would inhibit fiber movement
3Quantity of substance
If conventional cationic polymers are used for cationizing fabric, then some fixation is achieved, but water-insoluble particles such as pigments cannot be efficiently firmly fixed to the fabric
Solution Approach 1:
The patent employs a composite approach by combining the cationic polymer with specific functional groups and optimizing its molecular weight and charge density. This composite material structure enables the polymer to simultaneously achieve deep fabric penetration, strong surface binding, and efficient pigment particle fixation, overcoming the limitations of conventional cationic polymers
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 method enables the firm and efficient fixation of water-insoluble particles to fabrics, improving dyeing affinity and washing fastness, even on challenging materials like suede-like and aramid fibers, while maintaining fabric flexibility.
Implementation Method 1
a cationizing agent comprising: a polymer having a constituent unit (a1) derived from a vinylamine monomer... to cationize the fabric prior to firmly fixing water-insoluble particles to the fabric
Implementation Method 2
the constituent unit (a1) derived from a vinylamine monomer is a hydrolysate of a polymer having a constituent unit derived from an N-vinylamide compound... allowing for efficient fixation of water-insoluble particles like pigments
Data Source
AI summary
A cationizing agent for cationizing a cloth prior to the firm fixing of water-insoluble particles onto the cloth, said cationizing agent comprising a polymer having a constituent unit (a1) derived from a vinylamine monomer represented by formula (1). (In the formula, R1 represents a hydrogen atom or a methyl group.)