Technical Control Blocked Isocyanate Crosslinker for Durable Textile Coatings

In water-based coatings, the resin acts as the backbone of the film, determining the coating’s base performance. However, when water resistance, wet-rub color fastness, and chemical resistance are required, linear resin molecules alone often cannot deliver the desired level of performance.

This is where a crosslinker comes into play. By forming chemical bonds between polymer chains, it creates a densely crosslinked three-dimensional network, transforming the coating from a simple film-forming layer into a durable, high-performance finish.

Why Choose a Blocked Isocyanate Crosslinker?

Various types of crosslinkers are available to meet different application needs. Technical Control offers a plenty of crosslinking solutions, including the carbodiimide series (Carbolinker®) and blocked isocyanate crosslinkers, designed to accommodate different curing conditions and performance requirements. Among them, blocked isocyanate crosslinkers are particularly favored in textile applications for their excellent balance of environmental performance, ease of processing, and final performance.

Resistant to premature reaction: Unlike conventional isocyanates, which readily react with water and therefore must be mixed immediately before use, blocked isocyanates contain temporarily blocked –NCO groups that remain stable at room temperature. This enables pre-formulation into one-component systems with extended shelf life and greater formulation flexibility.

Safer and more environmentally friendly: Formaldehyde-free, contains no free isocyanates, and features a low-odor formulation, making it safer for operators and more environmentally friendly.

Dense crosslinking for superior performance: After thermal curing (typically above 120°C), the blocked –NCO groups are deblocked, releasing reactive isocyanate groups that readily react with hydroxyl, amino, and other functional groups in the resin or fibers to form a high-density crosslinked network. This significantly improves water resistance, wet-rub color fastness, and anti-yellowing performance.

If your process requires high-temperature curing and demands both washing resistance and strong environmental performance, a blocked isocyanate crosslinker is a reliable and effective choice.

Technical Control Blocked Isocyanate Crosslinker: Built for Water-Based Textile Systems

Technical Control Isolink PCI is an HDI-based aliphatic blocked isocyanate crosslinker that employs DMP blocking technology. It remains stable and unreactive at room temperature, and it can be premixed with resins such as waterborne polyurethane and hydroxyl-functional acrylic emulsions, to formulate one-component systems with extended shelf life and excellent processing flexibility—eliminating the need for immediate on-site mixing before use.

 Well suited for textile coating applications, this product combines excellent environmental performance with outstanding coating performance.

Product Features & Advantages

Formaldehyde-free

No formaldehyde is involved or released throughout production and application. The product is low in odor and is safer for both users and the environment.

Enhanced yellowing resistance

The aliphatic HDI structure helps the crosslinked coating resist yellowing or chalking under long-term exposure to light, heat, or humid conditions.

Suitable as a color-fixing agent for textile coating printing

In textile printing paste formulations, Isolink PCI serves as a highly effective color-fixing agent, helping reduce color fading and bleeding while enhancing print clarity and durability.

Enhances Wet-Rub Color Fastness and Water Resistance

After crosslinking, the coating forms a dense protective network that firmly locks in pigments while strengthening the bond between the coating and the fibers. Whether during everyday washing or friction under wet conditions, the colors remain vibrant and firmly fixed, with minimal fading or color transfer.

Applications

Technical Control Isolink PCI is primarily used as a crosslinker for waterborne resins, water-based coatings, and water-based inks. Combining safety, one-component convenience, and high crosslink density, it provides a reliable solution for textile coating applications that require enhanced durability after heat curing.

Recommended dosage: 5–10% crosslinker based on the total formulation

Product Parameters