Polyurethane Thickener Low VOC

Polyurethane Thickener

Here’s a brief overview:

1. Chemical Structure: Polyurethane thickeners are typically composed of hydrophilic (water-loving) and hydrophobic (water-repelling) segments. The hydrophilic parts interact with water, while the hydrophobic parts associate with each other or with other components in the formulation, creating a network that increases viscosity.

2. Mechanism of Action: These thickeners work through an associative mechanism. When added to a solution, the hydrophobic groups form temporary bonds with each other and with other particles in the formulation. This network structure increases the overall viscosity and provides excellent shear-thinning behavior, meaning the viscosity decreases under shear stress (e.g., during application) and recovers once the stress is removed.

3. Advantages:

  - Improved Application Properties: They provide better flow and leveling, reducing brush or roller marks.

  - Enhanced Stability: They help prevent sagging or settling of pigments and fillers.

  - Versatility: Suitable for both water-based and solvent-based systems.

  - Low VOC: Many polyurethane thickeners are low in volatile organic compounds, making them environmentally friendly.

4. Applications:

  - Coatings and Paints: Used in architectural paints, industrial coatings, and wood finishes.

  - Adhesives: Improve the viscosity and application properties of adhesives.

  - Personal Care Products: Found in lotions, creams, and gels to provide the desired texture and stability.

5. Types: There are different types of polyurethane thickeners, including:

  - HEUR (Hydrophobically Modified Ethoxylated Urethane): Commonly used in water-based systems.

  - HEUR-A: A variant with improved performance in high pH environments.

In summary, polyurethane thickeners are essential additives that enhance the performance and application properties of various formulations, making them a valuable tool in many industries.