Polyanionic cellulose, PAC HV & LV

Polyanionic cellulose (PAC) is a versatile polymer used in various industries, including oil drilling, pharmaceuticals, construction, and food. PAC is available in different viscosity grades, including high viscosity (HV) and low viscosity (LV), each with specific applications and properties:

1. Polyanionic Cellulose (PAC):
   • PAC is a water-soluble cellulose derivative derived from natural cellulose through chemical modification, typically by introducing carboxymethyl groups onto the cellulose backbone.
   • It is widely used as a rheology modifier, viscosifier, and fluid loss control agent in water-based systems.
   • PAC improves fluid properties such as viscosity, suspension of solids, and fluid loss control in various applications.
2. PAC HV (High Viscosity):
   • PAC HV is a grade of polyanionic cellulose with high viscosity.
   • It is used in drilling fluids for oil and gas exploration to provide high viscosity and excellent fluid loss control.
   • PAC HV is particularly useful in challenging drilling conditions where maintaining wellbore stability and carrying capacity for drilled cuttings is crucial.
3. PAC LV (Low Viscosity):
   • PAC LV is a grade of polyanionic cellulose with low viscosity.
   • It is also used in drilling fluids but is preferred when moderate viscosity and fluid loss control are required.
   • PAC LV offers viscosification and fluid loss control properties while maintaining lower viscosity compared to PAC HV.

Applications:

• Oil and Gas Drilling: PAC HV and LV are both essential additives in water-based drilling fluids, contributing to viscosity control, fluid loss control, and rheology modification.
• Construction: PAC LV may be used as a thickener and water retention agent in cementitious formulations such as grouts, slurries, and mortars used in construction applications.
• Pharmaceuticals: Both PAC HV and LV can serve as binders, disintegrants, and controlled-release agents in tablet and capsule formulations in pharmaceuticals.

In summary, polyanionic cellulose (PAC) in both high viscosity (PAC HV) and low viscosity (PAC LV) grades plays a critical role in various industries, including oil drilling, construction, and pharmaceuticals, providing rheological control, viscosity modification, and fluid loss control properties. The selection of PAC grade depends on specific application requirements and desired performance characteristics.