Fluorosilicone Oleophobic Coating for Printhead Thermal Stability
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Solution Overview
Problem
Current anti-wetting coatings for inkjet printheads suffer from mechanical robustness issues and instability under high-temperature, high-pressure conditions, leading to ink drooling, nozzle clogging, and poor image quality due to inadequate thermal and mechanical stability.
Innovation Solution
Development of thermally stable, mechanically robust oleophobic grafted polymers formed by crosslinking fluoroelastomers with perfluorosilicones, which provide high ink contact angles and low sliding angles, enabling self-cleaning and maintaining performance under stringent conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If current anti-wetting coatings are used on printhead front face, then thermal stability is maintained, but mechanical robustness deteriorates
Solution Approach 1:
The patent applies composite materials by combining fluoroelastomer base polymer with silane crosslinking agents and fluorinated surfactants to create a coating that simultaneously achieves thermal stability and mechanical robustness. The composite structure integrates multiple functional components: the fluoroelastomer provides thermal resistance, the silane crosslinks provide mechanical strength, and the fluorinated surfactants provide oleophobic properties.
2Object-affected harmful factors
If conventional coatings are applied to polyimide film, then anti-wetting properties are achieved, but coating stability under manufacturing conditions deteriorates
Solution Approach 1:
The patent applies parameter changes by modifying the chemical composition and crosslinking density of the coating to enhance its stability under high-temperature manufacturing conditions. The silane crosslinking creates a three-dimensional network structure that maintains coating integrity at elevated temperatures during printhead assembly, while the fluorinated components maintain low surface energy for anti-wetting performance.
3Strength
If coating thickness is increased to improve mechanical robustness, then strength improves, but thermal stability deteriorates due to higher mass loss
Solution Approach 1:
The patent applies local quality by creating a crosslinked network structure distributed throughout the coating matrix, where the silane crosslinks are positioned at strategic points to provide mechanical reinforcement without requiring increased overall coating thickness. This localized strengthening maintains thermal stability while achieving the required mechanical robustness.
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 oleophobic grafted polymer coatings exhibit excellent thermal stability, minimal thickness and mass loss at high temperatures, and easy clean properties, ensuring reliable performance and long shelf life, even under extreme conditions, thus addressing the mechanical robustness and stability issues of existing coatings.
Implementation Method 1
oleophobic anti-wetting coatings employed on the front face of a printhead
Implementation Method 2
high ink contact angles and low sliding angles
Implementation Method 3
thermally stable, mechanically robust oleophobic grafted polymers formed by crosslinking fluoroelastomers with perfluorosilicones
Implementation Method 4
crosslinking fluoroelastomers with perfluorosilicones
Implementation Method 5
low adhesion coatings based on oleophobic grafted polymers
Implementation Method 6
anti-wetting properties that are useful to repel wetting by solvent-based, solid inkjet based, and other pigmented and UV curable ink compositions
Data Source
AI summary
An inkjet printhead includes a front face having a polymer coating, the polymer coating including an oleophobic grafted polymer having a crosslinked fluoroelastomer and a perfluorinated fluorosilicone grafted to the crosslinked fluoroelastomer. The polymer coating has an ink contact angle of at least about 45 degrees and an ink slide angle of less than about 35 degrees.