PAC Low Viscosity

Characteristics of Low-Viscosity Polyanionic Cellulose (PAC-LV):

1. Excellent Rheological Properties: The viscosity range of PAC-LV is typically 50-500 mPa·s, lower than conventional PAC products (1000-3000 mPa·s). This low viscosity characteristic allows it to remain stable under high shear conditions, exhibiting significant shear dilution properties (e.g., viscosity can decrease by more than 60% in drilling fluids), making it suitable for dynamic fluid environments.
 

2. Strong Salt and Temperature Resistance: Experimental data shows that PAC-LV can maintain more than 80% viscosity retention even at salt concentrations up to 20%, and its short-term temperature resistance can reach 120℃, superior to natural colloids (such as guar gum).
 

3. High Environmental Compatibility: Its molecular structure does not contain heavy metal ions, and its biodegradability exceeds 70%, meeting food-grade and pharmaceutical-grade certification requirements.
 

Applications of Low-Viscosity Polyanionic Cellulose

*Food Industry
• Stabilizer and Thickener: Used in low-sugar beverages and dairy products to provide uniform suspension (addition amount 0.1%-0.5%), preventing clumping or stratification.
• Low-Calorie Formulation Carrier: Replaces part of the fat (only 4 kcal per gram), suitable for weight-loss foods, such as meal replacement powders.
 

*Oil Extraction
• Drilling Fluid Additive: As a filtration reducer, it can reduce mud moisture loss (API filtration loss < 15 ml/30 min), improving wellbore stability.
• Fracturing Fluid Thickener: In shale gas extraction, PAC-LV is used in combination with guar gum to enhance sand carrying capacity (sand ratio increased to 30%).
 

*Pharmaceutical Field
• Sustained-Release Formulation Excipient: Utilizing its pH-responsiveness (dissolves in the intestine), it is used in enteric-coated capsule shells.
• Topical Gel Matrix: When used in combination with carbomer, it can shorten transdermal drug delivery time (in vitro experiments show a 40% increase in penetration efficiency).
 

Comparative analysis with medium and high viscosity products

• Cost-effectiveness: PAC-LV requires a lower unit dosage (20%-30% less dosage for equivalent results), but requires higher purity raw materials (cellulose content > 99%).

• Process compatibility: Low viscosity is more suitable for spray drying or high-speed mixing processes, while high viscosity products are mostly used for static thickening (such as coatings).
 

FAQ

1. Q: What is the main function of PAC-LV?
A: It is mainly used as a filtration loss reducer, effectively controlling drilling fluid filtration loss while almost not increasing system viscosity, making it particularly suitable for high-solids-content drilling mud systems.

2. Q: What drilling environments is PAC-LV suitable for?
A: It is suitable for various water-based drilling fluids, including freshwater, seawater, and brine. It can withstand temperatures up to approximately 150℃ and maintains stable performance in complex formations such as high-temperature and high-salinity environments.

3. Q: How to choose between PAC-LV and high-viscosity PAC-HV?
A: PAC-LV focuses on reducing filtration loss with minimal impact on viscosity, making it suitable for systems requiring good fluidity. PAC-HV focuses on thickening and viscosity enhancement, making it suitable for scenarios requiring improved rock-carrying capacity.