Ink set and inkjet recording method
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Solution Overview
Problem
Existing inkjet recording methods on inkjet recording fabrics suffer from inadequate wet friction fastness, chromogenic property, and texture.
Innovation Solution
An ink set comprising a first treatment liquid with a water-soluble cationic resin and a second treatment liquid with a pigment and an anionic resin having a glass transition temperature of 0°C or lower, is used in conjunction with an inkjet recording method that involves ejecting these liquids onto a fabric in a continuous wet-on-wet manner.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If existing inkjet recording methods are used on inkjet recording fabric, then production efficiency is improved, but wet friction fastness deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the cation valence of the water-soluble cationic resin within 1.2-6.2 mmol/g and molecular weight within 500-4000, along with using an anionic resin with Tg ≤ 0°C. These parameter optimizations resolve the contradiction by achieving both high production efficiency through inkjet method and satisfactory wet friction fastness through optimized resin specifications
Solution Approach 2:
The patent uses composite materials by combining water-soluble cationic resin with anionic resin containing pigment in a two-liquid system. The cationic resin provides adhesion and fastness while the anionic resin with Tg ≤ 0°C ensures chromogenic property and texture, achieving both productivity and reliability requirements
2Productivity
If existing inkjet recording methods are used on inkjet recording fabric, then production efficiency is improved, but chromogenic property deteriorates
Solution Approach 1:
The patent optimizes chromogenic property through parameter changes by using an anionic resin with glass transition temperature Tg ≤ 0°C and controlling the cation valence of water-soluble cationic resin within 1.2-6.2 mmol/g. These parameter specifications ensure excellent chromogenic property while maintaining inkjet method productivity
Solution Approach 2:
The composite material system combines water-soluble cationic resin with anionic resin containing pigment, where the anionic resin's low Tg (≤ 0°C) specifically addresses chromogenic property requirements while the cationic resin maintains adhesion, achieving both productivity and manufacturing precision
3Productivity
If existing inkjet recording methods are used on inkjet recording fabric, then production efficiency is improved, but texture deteriorates
Solution Approach 1:
The patent improves texture through parameter changes by using an anionic resin with Tg ≤ 0°C and controlling water-soluble cationic resin properties (cation valence 1.2-6.2 mmol/g, molecular weight 500-4000). These parameter optimizations ensure good texture is maintained while achieving high production efficiency
Solution Approach 2:
The composite material system of water-soluble cationic resin and anionic resin with pigment provides synergistic effects where the anionic resin's low Tg ensures good texture and the cationic resin provides adhesion, achieving both productivity and compositional stability
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 proposed ink set and method achieve satisfactory wet friction fastness, chromogenic property, and texture, improving the overall image formation on fabrics.
Implementation Method 1
a water-soluble cationic resin and a first solvent; and a second treatment liquid containing a pigment, an anionic resin having a Tg of 0°C or lower
Data Source
AI summary
Provided is an ink set having satisfactory wet friction fastness, chromogenic property, and texture. The ink set includes: a first treatment liquid containing a water-soluble cationic resin and a first organic solvent; and a second treatment liquid containing a pigment, an anionic resin having a Tg of 0°C or lower, and a second organic solvent. The water-soluble cationic resin has a cation valence of 1.2 mmol/g or more and 6.2 mmol/g or less. The water-soluble polymer has a molecular weight of 500 or more and 4000 or less