Ink Polymer Cross-Linking for High-Temperature Drying Stability
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Solution Overview
Problem
Inkjet recording methods face challenges with pigment dispersion stability at high temperatures, leading to decreased image density due to pigment aggregation and uneven distribution during high-speed drying processes.
Innovation Solution
An ink formulation containing water, a pigment, and a polymer with a specific structure unit that reduces flowability against heat, preventing pigment aggregation and maintaining stability, comprising a compound with an alkoxysilane portion and a glycidyl group that forms a cross-linked structure with a carboxylic acid, enhancing dispersibility and storage stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the drying temperature is increased to 100 degrees C. or higher for high-speed drying, then the drying efficiency is improved, but the pigment dispersion is destroyed and the pigment is aggregated and unevenly distributed, resulting in a significant decrease in image density
Solution Approach 1:
The patent introduces a polymer with specific structure units (including silane and glycidyl groups) as an intermediary substance between the pigment and the high-temperature drying environment. This polymer acts as a protective mediator that prevents direct contact between heat and pigment particles, thereby preventing aggregation while allowing efficient drying to proceed at high temperatures
Solution Approach 2:
The patent changes the chemical and physical parameters of the ink formulation by incorporating specific polymer structure units with particular molecular weights and compositions. These parameter changes modify the ink's resistance to thermal effects, enabling it to withstand high-temperature drying without pigment aggregation, thus resolving the contradiction between drying efficiency and image quality
2Productivity
If the drying temperature is raised to improve drying speed, then the productivity is improved, but the pigment dispersion stability is destroyed leading to uneven distribution
Solution Approach 1:
The patent creates a composite ink system combining pigment particles with specific polymer molecules that have both hydrophilic and thermally stable characteristics. This composite structure maintains pigment dispersion stability even under high-temperature conditions, allowing fast drying without loss of uniformity
Solution Approach 2:
The polymer serves as a thermal intermediary that absorbs and distributes heat evenly throughout the ink formulation, preventing localized overheating that would cause pigment aggregation. This intermediary mechanism preserves dispersion stability while enabling high-speed drying
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 ink maintains image density and stability during high-temperature drying, preventing pigment aggregation and ensuring consistent print quality even at high speeds.
Implementation Method 1
a polymer having a structure unit represented by the following Chemical structure 1... comprising a compound with an alkoxysilane portion and a glycidyl group that forms a cross-linked structure with a carboxylic acid
Data Source
AI summary
An ink contains water, a pigment, and a polymer having a structure unit represented by the following Chemical structure 1,where R1 represents an organic group having at least carbon and oxygen.