White Ink Composition for Crack-Resistant Textile Printing
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Solution Overview
Problem
Conventional ink jet printing methods using water-soluble dyes for textiles face issues with low lightfastness, complex processing, and unevenness in color images due to poor solid filling and cracking when stretched, necessitating a white ink with high whiteness and uniformity.
Innovation Solution
A white ink formulation comprising a white pigment, polycarbonate urethane resin, polyether urethane resin, and water, optionally with a surfactant and water-soluble organic solvent, designed to maintain whiteness and prevent cracking when stretched, and an ink set with color inks having matching surface tension for improved solid filling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a white base is formed using conventional white ink to improve color image quality on dark fibers, then the whiteness degree increases, but cracks occur when the recording material is stretched
Solution Approach 1:
The patent changes the chemical composition parameters of the white ink by specifying precise proportions of titanium oxide (5-15 parts), zinc oxide (2-10 parts), urethane resin (3-15 parts), and water (70-85 parts). This parameter optimization allows the ink to achieve high whiteness while maintaining flexibility and crack resistance when the fabric is stretched.
Solution Approach 2:
The patent creates a composite white ink system combining multiple pigments (titanium oxide and zinc oxide) with urethane resin and water. This composite formulation synergistically provides both high whiteness coverage and elastic properties that prevent cracking during fabric deformation.
2Quantity of substance
If conventional white ink is used to form a white base, then coverage is achieved, but unevenness appears in the base formation
Solution Approach 1:
The patent optimizes the concentration parameters of each component, particularly setting titanium oxide at 5-15 parts and zinc oxide at 2-10 parts relative to urethane resin. This precise parameter control ensures uniform distribution and consistent coverage without unevenness in the white base formation.
Solution Approach 2:
The patent achieves homogeneity by carefully balancing the ratio of hydrophobic pigments (titanium oxide, zinc oxide) with the hydrophilic urethane resin and water mixture. This homogeneous composition ensures uniform spreading and consistent white base formation across the fabric surface without localized unevenness.
3Illumination intensity
If water-soluble dyes are used for coloring, then sharp hue and wide color range are achieved, but lightfastness is low and processing is complicated
Solution Approach 1:
The patent uses white ink containing urethane resin as an intermediary base layer that enables the use of lightfast pigments while achieving good color reproduction. The white base provides a neutral foundation that enhances pigment performance without requiring complex fixing and washing processes needed for water-soluble dyes.
4Ease of manufacture
If color ink is directly printed on deep-colored fiber, then processing is simplified, but color recognition is poor
Solution Approach 1:
The patent applies preliminary action by first forming a white base layer using the optimized white ink before printing color images. This pre-prepared white foundation dramatically improves color recognition and vibrancy on dark fibers, while the overall process remains simpler than traditional dyeing methods as it eliminates fixing and washing steps.
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 white ink achieves high whiteness, prevents cracking, and ensures uniform base formation, while the ink set provides excellent solid filling and image quality on textile fibers.
Implementation Method 1
an ink set including the white ink and at least one color ink, in which a difference in surface tension at 25° C. between the white ink and the color ink is within a range of ±0 to 3 mN/m
Data Source
AI summary
A white ink containing a white pigment, a polycarbonate urethane resin, a polyether urethane resin, and water; and a recording method using the white ink. An ink set provided with the white ink and at least one color ink, the color ink being an aqueous ink containing a coloring agent, the white ink and the color ink differing in surface tension at 25° C. by ±0-3 mN/m; and a recording method using the ink set.