Application of Cationic Polyacrylamide in the Paper Industry

Cationic polyacrylamide (CPAM) is a high-molecular-weight polymer with abundant cationic groups in its molecular chains. It can tightly adsorb negatively charged substances, achieving efficient flocculation and sedimentation. In the paper industry, CPAM is widely used to treat pulp, promoting the rapid sedimentation of suspended particles and fibers through adsorption and bridging effects.

CPAM as Paper Dry Strength Agent

As a paper dry strength agent, CPAM significantly improves paper dry strength. It forms hydrogen bonds with fibers during papermaking, enhancing fiber bonding force, stabilizing paper formation and reducing breakage.

CPAM as Papermaking Dispersant

CPAM acts as an effective papermaking dispersant, promoting uniform dispersion of fibers and suspended particles in pulp. This improves paper uniformity and reduces production costs.

CPAM as Retention Aid

As a retention aid, CPAM accelerates fiber sedimentation and impurity separation via adsorption and bridging, improving paper purity and production efficiency.

CPAM as Filter Aid

As a filter aid, CPAM speeds up water separation from pulp, increasing paper drying speed and saving energy.

CPAM Usage Notes

  • Dilute CPAM to 0.1%–0.3% aqueous solution before use, then add via a screw pump. Adjust dosage according to actual working conditions.
  • Avoid contact between the prepared solution and iron or other metal containers to prevent CPAM degradation.

CPAM Dosage Reference

  • For sludge dewatering: 0.2% concentration, stir for 50 minutes before dosing.
  • For laboratory tests: Take 100ml wastewater, add 0.5ml CPAM solution dropwise each time, and determine the optimal dosage by floc size, compactness, supernatant clarity and sedimentation rate.
  • Suitable for pharmaceutical factories, tanneries, printing and dyeing, chemical industry, paper mills and sewage treatment plants. Dosage: 10–20g dry powder per ton of wastewater.

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