Solvent-borne, Speciality Additive, Wetting & Levelling Agent

VP 7331 Wetting Levelling agent

7331 is a high-performance, polyether-modified polydimethylsiloxane copolymer designed to optimize the surface properties of liquid coatings, inks, and adhesive systems. As a non-reactive silicone surfactant, it significantly reduces the static and dynamic surface tension of solvent-borne, solvent-free, and water-based formulations. This specialized additive excels in promoting substrate wetting, effectively preventing surface defects such as craters, pinholes, and orange peel. Its unique molecular architecture balances compatibility and surface activity, ensuring a smooth, high-gloss finish without adversely affecting inter-coat adhesion or foam stability. By migrating to the air-liquid interface, 7331 provides exceptional slip and mar resistance, enhancing the overall durability and aesthetic quality of the cured film. It is particularly effective in high-speed coating processes where rapid wetting and leveling are critical for production efficiency. This versatile agent is an essential component for formulators seeking to achieve defect-free applications on low-energy substrates, ensuring consistent performance across diverse industrial and decorative coating sectors.

Attributes

Key Features and Benefits

Superior Substrate Wetting: Drastically lowers surface tension to allow application on contaminated or low-energy substrates like plastics and metals.
Advanced Surface Leveling: Promotes exceptional flow characteristics, eliminating “orange peel” and brush marks for a mirror-like finish.
Enhanced Slip and Mar Resistance: Increases surface lubricity, providing significant protection against mechanical scratches, scuffing, and abrasion.
Anti-Crater Performance: Effectively prevents surface defects caused by external contaminants such as dust, oil, or silicone droplets.
Broad Compatibility: Exhibits excellent miscibility in water-borne, solvent-borne, and UV-curable systems without causing haze or turbidity.

Specifications

Technical Highlights

Chemical Composition: Organo-modified polysiloxane (polyether-modified polydimethylsiloxane) designed for optimal migration rates during the drying and curing phase.
Non-Reactive Nature: Chemically inert structure ensures long-term stability in various resin systems, including hydroxyl-functional or acidic formulations.
High Active Content: Typically supplied as 100% active matter, ensuring maximum cost-efficiency and minimal VOC contribution to the final product.
Dynamic Surface Tension Reduction: Rapidly equilibrates at new interfaces, making it ideal for high-speed printing and industrial spray applications.
Processing Efficiency: Low dosage requirements (0.1–1.0% total weight) significantly optimize cost-to-performance ratios for large-scale industrial manufacturing environments.

Download Technical Data Sheet (TDS)

Practical industry uses

Applications

Automotive Coatings: Utilized in basecoats and clearcoats to achieve high-image clarity (DOI) and superior resistance to environmental etching.
Industrial Wood Finishes: Improves wetting on porous wood surfaces and ensures uniform leveling in high-solids polyurethane and acid-cured lacquers.
Graphic Arts and Inks: Enhances substrate wetting in water-based and UV-offset inks, preventing “crawling” on non-polar plastic films and foils.
Architectural Coatings: Provides smooth application and minimizes roller marks in high-quality decorative paints and interior/exterior emulsion systems.
Protective Coatings: Used in heavy-duty anti-corrosion primers to ensure complete coverage on grit-blasted steel and irregular metallic surfaces.