Cold Transfer Printing Paste for Stable Viscosity Retention
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Solution Overview
Problem
Existing printing pastes for cold transfer printing suffer from poor rheological properties, instability in the presence of metal ions, high cost, and chromatic aberration due to the use of starch and sodium alginate, and are not suitable for high-speed transfer printing processes.
Innovation Solution
A novel paste and colorant formulation using polysaccharide, sodium L-pyrrolidonecarboxylate, and low-viscosity etherified starch, which provides good rheological properties, stability, low cost, and high color fastness, suitable for cold transfer printing processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If starch or modified starch is used as the principal component of printing paste, then the paste has good stability, but the rheological properties are poor
Solution Approach 1:
The patent uses a composite system combining starch or modified starch with sodium alginate and other additives to achieve both good stability and improved rheological properties. The combination allows the paste to maintain compositional stability while gaining better flow and printing characteristics through the synergistic effects of multiple components.
2Ease of manufacture
If sodium alginate is used in printing paste, then the paste can be formulated, but calcium alginate precipitates in hard water causing colorant performance damage and chromatic aberration
Solution Approach 1:
The patent adds sequestrants or chelating agents to the printing paste formulation that preemptively bind calcium ions and other metal ions before they can react with sodium alginate to form precipitates. This preliminary anti-action prevents the harmful precipitation reaction from occurring, maintaining colorant performance and preventing chromatic aberration.
Solution Approach 2:
The patent introduces sequestrants as intermediary substances that mediate between the sodium alginate and calcium ions. These intermediaries preferentially bind metal ions, preventing them from interacting with the alginate and causing precipitation, thus protecting the colorant system from degradation.
3Ease of operation
If modified paste synthesized by polymerization of starch, vinyl acetate and acrylic acid is used for cold transfer printing, then the paste can be applied, but the colorant viscosity is lost during high-speed printing due to poor rheological properties
Solution Approach 1:
The patent formulates the printing paste with dynamic rheological properties that allow it to maintain viscosity under varying shear conditions. The paste exhibits shear-thinning behavior that provides stability during storage and application, then flows appropriately during high-speed printing, and rapidly recovers viscosity after printing to prevent smearing and maintain pattern definition.
Data Source
AI summary
The present invention relates to a cold transfer printing paste, a printing colorant and preparation methods thereof. Specifically, the present invention relates to: a cold transfer printing past, which contains polysaccharide, sodium L-pyrrolidonecarboxylate, an etherified starch and water; a printing colorant, which contains the paste of the present invention, an active dye, a defoamer, a flatting agent, a pH stabilizing agent and water; and preparation methods of the paste and the printing colorant. The cold transfer printing paste of the present invention and a printing colorant containing the paste are applicable in a cold transfer printing process, and have stable physical properties, thereby preventing decrease of the viscosity in use.