Polyanionic Cellulose supplier

The Structural Mystery of PAC

Polyanionic cellulose is a water-soluble polymer compound with negatively charged groups on its molecular chains. Its molecular weight typically ranges from 100,000 to 1,000,000 Daltons. This unique structure endows it with the following properties:
* Highly rigid molecular chains
* Extended state in water
* Negatively charged groups provide electrostatic repulsion

Comparison of Molecular Weight Determination Methods

There are three main methods for determining the molecular weight of polyanionic cellulose:
* Viscosity method: Simple to operate, suitable for routine testing
* Light scattering method: High precision, can obtain absolute molecular weight
* Gel permeation chromatography: Can simultaneously determine molecular weight distribution
 

The Influence of Molecular Weight on Applications

Polyanionic cellulose powders of different molecular weights exhibit significant differences in applications:
- Low molecular weight: Good flowability, suitable as a dispersant
- Medium molecular weight: Significant thickening effect, commonly used in the food industry
- High molecular weight: Strong film-forming properties, often used in special coating materials
 

Application Differences in Different Scenarios

* Direct Addition: When added directly to food as a formulation ingredient, it is usually classified as a food additive.
* Processing Aid: When used only during the production process and does not remain in the final product, it may not be considered an additive.
* Functional Fortification: When used in specific nutritionally fortified foods, it must meet the corresponding regulatory requirements.
 

Safety and Regulatory Consensus

Food-grade PAC, after purification, has good safety under limited dosage, and is permitted for use in designated food categories by major global food regulatory systems. However, industrial-grade PAC, due to impurities, must never be used in the food sector. Users should purchase from legitimate channels and strictly distinguish between intended and intended uses.
 

Petroleum-grade PAC plays two main roles in oil drilling:

1. Application of High-purity PAC in oil drilling fluids: Strong cuttings carrying capacity, inhibits clay dispersion, reduces slurry production rate, and stabilizes the wellbore; good suspension ability, containing a large amount of solids, greatly increasing particle stability; good calcium resistance; low sensitivity to salts and potassium, and strong resistance to salts, calcium, and magnesium, making it suitable as a rheology modifier.
2. Application of PAC polymer in completion fluids: Improves cementing fluid fluidity; adjusts fluid fluidity, thixotropy, and suspended solids; rapidly increases the viscosity of fracturing fluids, and can replace guar gum.