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With the continuous improvement of Carboxymethyl Cellulose (CMC) production technology, the market demands higher-performance products, especially in oilfield applications and construction additives. As a leading PAC manufacturer, Celotech provides premium PAC in China under the Celopac™ brand, catering to industries such as oil drilling, cement-based materials, and water retention agents.

What is Polyanionic Cellulose (PAC)?

PAC is essentially a uniformly substituted CMC produced under specific liquid-solid ratio conditions and advanced manufacturing processes. It is a high-performance ionic cellulose ether derived from refined cotton and wood pulp through alkalization, carboxymethylation, neutralization, and purification. Due to superior equipment, precise process control, and an optimized substitution pattern, PAC exhibits better solubility, stability, and performance compared to standard CMC suppliers’ products.

The following image is an infrared spectrum (1-CMC, 2-PAC). From this image we can find that the structure of CMC and PAC is very similar.

The following diagram is the PAC/CMC production line flowchart of a company：

Key Production Factors for PAC

There are three critical factors in producing high-quality PAC:

  1. Raw materials – High-purity refined cotton or wood pulp
  2. Advanced equipment – Ensuring uniform molecular structure
  3. Optimized formulation and process control

Properties and Advantages of PAC vs. CMC

  1. Molecular Weight: PAC has a higher molecular weight than CMC under the same degree of substitution (DS), making it more effective in oilfield drilling fluids and cementitious materials.
  2. Solubility: PAC is easily soluble in both cold and hot water. Additionally, surface-treated PAC offers delayed solubility, which is beneficial for controlled release applications in dry mortar, tile adhesives, and gypsum-based compounds.
  3. Biostability: The uniform substituent distribution of PAC improves its biostability, making it a superior choice for long-term water retention in construction additives.
  4. Safety and Compatibility: PAC is non-toxic, safe for human and animal contact, and compatible with conventional water-soluble adhesives, softeners, and resins, making it ideal for environmentally friendly building materials.
  5. Salt and Acid Resistance: PAC exhibits excellent salt resistance (SVR: 0.8 ~ 1.36) and acid resistance, significantly outperforming CMC (SVR: 0.5 ~ 0.8). High-purity PAC is even suitable for food-grade applications, such as yogurt stabilization.
  6. Transparency: Solutions containing PAC exhibit higher transmittance compared to those with CMC, which is crucial for applications requiring clear and stable formulations.
  7. Rheology and Stability: PAC solutions maintain a more stable viscosity over time compared to CMC, ensuring consistent performance in construction materials, grouts, and drilling fluids.
  8. Yield Value: The table below compares the viscosity and yield values of PAC vs. CMC in a 1% solution with 4% NaCl:
SampleViscosity (mPa.s)Yield Value
CMC568043.0
PAC ①2275102
PAC ②4100110
PAC ③1550098

 

Applications of PAC in Construction and Oil Drilling

  1. PAC for Oil Drilling: Celotech’s Celopac™ PAC plays a vital role in drilling fluids, helping to reduce fluid loss, increase viscosity, modify rheology, and form durable mud cakes, ultimately improving flow properties in oilfield applications.
  2. PAC in Construction Additives: PAC is widely used as a water retention agent, thickener, and rheology modifier in dry mix mortars, cement-based plasters, ceramic tile adhesives, wall putties, and gypsum products.

Why Choose Celotech’s Celopac™ PAC?

As a trusted PAC manufacturer in China, Celotech delivers high-quality PAC products, including:

By choosing Celotech, you gain access to premium PAC solutions tailored for oil drilling, cement-based additives, and industrial formulations. Contact us today to learn more about our high-quality PAC and CMC products!

 

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