Pretreatment composition, print set, and textile printing method
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Solution Overview
Problem
Inkjet textile printing faces issues with 'traces' and 'strike-through' on fibers, leading to reduced appearance quality and commercial value, especially when using dark-colored fibers or white substrates, and there is a need for a pretreatment composition that prevents these issues while maintaining high color development and whiteness.
Innovation Solution
A pretreatment composition containing a cationic polymer with specific structural units and a crosslinking agent is applied to form a wet precoat layer, which is then used in conjunction with a water-based ink composition to prevent 'traces' and 'strike-through' and enhance image quality on various fabrics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a high-concentration pretreatment liquid or a large amount of pretreatment liquid is applied to prevent strike-through, then strike-through is prevented, but traces remain on the fiber surface impairing appearance quality
Solution Approach 1:
The patent changes the chemical parameters of the pretreatment composition by incorporating specific cationic polymers with controlled molecular weights (10,000-1,000,000) and specific functional groups (carboxyl, hydroxyl, or amine groups with specific content ranges). These parameter changes allow the pretreatment liquid to form an effective barrier against strike-through while maintaining appropriate drying characteristics that prevent trace formation on the fiber surface.
Solution Approach 2:
The patent uses composite material strategy by combining cationic polymers with specific molecular weight ranges and functional group compositions. This composite approach creates a pretreatment composition that simultaneously provides strike-through prevention and maintains surface appearance quality, resolving the contradiction between these two requirements.
2Illumination intensity
If water-soluble dyes are used for inkjet textile printing, then vivid hues and wide color gamut are achieved, but light resistance is low and processing becomes complicated
Solution Approach 1:
The cationic polymer pretreatment composition acts as an intermediary layer between the water-soluble dye and the fiber. This intermediary layer enables the use of water-soluble dyes (which provide vivid hues and wide color gamut) while preventing their water solubility issues and improving light resistance, thus resolving the contradiction between color quality and durability.
3Illumination intensity
If whiteness and hiding property are increased for dark-colored fibers, then color development is improved, but strike-through may occur depending on fiber type
Solution Approach 1:
The patent applies local quality by creating a localized pretreatment layer on the fiber surface with specific cationic polymer composition. This localized treatment provides both the whiteness needed for color development and the strike-through prevention, allowing the substrate to serve dual functions without compromising either property.
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 solution effectively suppresses 'traces' and 'strike-through' while achieving high color development and whiteness, improving the overall quality and commercial value of printed textiles.
Implementation Method 1
a cationic polymer that contains a specific structural unit
Implementation Method 2
a crosslinking agent
Data Source
AI summary
A pretreatment composition is used to form a wet precoat layer for forming an image on a fabric by an inkjet method, wherein [1] the water-based ink composition contains water, a pigment, a resin emulsion, a water-soluble organic solvent, and a surfactant, [2] the pretreatment composition is used to form the wet precoat layer in which an amount of the pretreatment composition applied per unit area is more than 0.035 g/cm2 and less than 0.070 g/cm2, [3] the pretreatment composition contains water, more than 1.4 mass % and less than 10.5 mass % of a cationic polymer, and 0.1 mass % or more and less than 2.7 mass % of a crosslinking agent with respect to the total mass of the pretreatment composition, and [4] the cationic polymer contains at least one selected from an allylamine structural unit, a diallylamine structural unit, a diallylammonium structural unit, and an epihalohydrin structural unit.