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Ink Repellent Coating for Glass Surfaces
In this case study, we present the successful development of a single-component ink-repellent coating for glass surfaces. The coating was designed to create a low surface energy layer that renders the surface oleophobic (oil-repellent) and hydrophobic (water-repellent), thereby preventing ink from adhering to the glass. The coating was developed for a client with specific requirements for easy cleaning and maintenance of glass surfaces in high-traffic areas.
Background
The client sought a solution to prevent ink and other liquids from sticking to their glass surfaces. This was particularly important for products used in environments where graffiti and other forms of vandalism were common. The challenge was to create a coating that could be easily applied, cured quickly, and provide durable, long-lasting protection against ink adhesion.
Environments where vandalism is common present unique challenges for glass maintenance, requiring specialized protective solutions.
Objectives
Easy Application
Develop a single-component coating that can be easily applied to glass surfaces.
Quick Curing
Achieve a curing time of 10 to 15 minutes at low heat.
Surface Properties
Create a low surface energy layer that is both oleophobic and hydrophobic.
Durability
Ensure that the coating is durable and resistant to wear and tear.
Coating Composition

Complete Coating
Low surface energy protective layer
Siloxane
Provides hydrophobic and oleophobic properties
Isocyanate
Cross-linking agent for durability and adhesion
Polyols
Contributes to flexibility and toughness
The coating was formulated using a combination of siloxane, isocyanate, and polyols. These components were chosen for their ability to create a low surface energy surface when cured. Siloxane provides hydrophobic and oleophobic properties due to the presence of Si-O-Si bonds, which reduce the surface energy of the coating. Isocyanate acts as a cross-linking agent, enhancing the durability and adhesion of the coating to the glass surface. Polyols contribute to the flexibility and toughness of the coating, ensuring it can withstand mechanical stress.
Application and Curing Process
Pre-treatment
The glass surface was cleaned to remove any dirt, grease, or contaminants that could interfere with coating adhesion.
Coating Application
The coating was applied using a spray gun, ensuring uniform coverage across the surface.
Curing
The coated glass was cured at a low temperature (40-60°C) for 10 to 15 minutes. The curing process involved the cross-linking of the isocyanate and polyol components, forming a durable, low surface energy layer.
Performance Testing
Contact Angle Measurement
To assess the hydrophobic and oleophobic properties of the coating. Water droplets formed contact angles of over 120 degrees, indicating a superhydrophobic surface. Oil droplets formed contact angles of over 100 degrees, confirming the oleophobic nature.
Adhesion Testing
To ensure the coating remained bonded to the glass surface under various conditions. The coating showed excellent adhesion properties even after exposure to environmental stressors.
Durability Testing
To evaluate the coating's resistance to abrasion, chemicals, and environmental factors. The coating maintained its performance properties after repeated cleaning and exposure to UV light.
Results and Performance
When ink was applied to the coated glass surface, it bead up and rolled off easily, leaving no residue behind. This was a significant improvement over uncoated glass, where ink would adhere strongly and require harsh solvents for removal. The curing time of 10 to 15 minutes at low heat (40-60°C) was achieved, making the coating suitable for industrial-scale production without the need for lengthy curing cycles. The coating showed excellent durability, withstanding repeated cleaning with abrasive materials and exposure to various chemicals without degradation.
Conclusion and Future Prospects
Conclusion
The development of this single-component ink-repellent coating represents a significant advancement in protective coatings for glass surfaces. The coating's ability to create a low surface energy, oleophobic, and hydrophobic layer provides a durable solution for preventing ink adhesion, making it easier to maintain and clean glass products in high-traffic environments.
About Researpa
Researpa is a research and development consultancy specializing in custom formulations, technical and innovation consulting. With expertise in coatings, adhesives, home care, and more, Researpa is dedicated to delivering innovative, sustainable, and high-performance solutions for a variety of industries.
Future Prospects
This coating technology has the potential to be applied in various other industries where low surface energy coatings are desirable, such as in architectural glass, automotive glass, and electronic displays. Future research could focus on optimizing the coating for specific applications, such as improving its resistance to chemical attack or enhancing its self-cleaning properties.
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