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.

• Develop a single-component coating that can be easily applied to glass surfaces.
• Achieve a curing time of 10 to 15 minutes at low heat.
• Create a low surface energy layer that is both oleophobic and hydrophobic.
• Ensure that the coating is durable and resistant to wear and tear.

1. Coating Composition

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.

2. Application and Curing Process

The coating was designed to be applied as a single component, eliminating the need for mixing multiple components on site. The application process involved the following steps:

• 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.

3. Performance Testing

The performance of the coating was evaluated through a series of tests, including:

• Contact Angle Measurement: To assess the hydrophobic and oleophobic properties of the coating.
• Adhesion Testing: To ensure the coating remained bonded to the glass surface under various conditions.
• Durability Testing: To evaluate the coating’s resistance to abrasion, chemicals, and environmental factors.

1. Surface Energy Reduction

The coating successfully reduced the surface energy of the glass, making it highly resistant to ink adhesion. Contact angle measurements showed that water droplets formed contact angles of over 120 degrees, indicating a superhydrophobic surface. Similarly, oil droplets formed contact angles of over 100 degrees, confirming the oleophobic nature of the coating.

2. Ink Repellency

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.

3. Curing Time

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.

4. Durability

The coating showed excellent durability, withstanding repeated cleaning with abrasive materials and exposure to various chemicals without degradation. The coating also maintained its performance properties after exposure to UV light and temperature cycling.

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.

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.

About Researpa

Researpa is a research and development consultancy specializing in chemistry and chemical engineering solutions. 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. Contact us today or Schedule a Meeting Here: Link