The application of branched polyethylenimine(EPOMIN) in the papermaking

EPOMIN P-1050 is a high-molecular-weight polyethylenimine solution. PEI is a highly cationic polymer that is fully water-soluble and used as a papermaking additive and for white water purification.

It has previously been used as a temporary wet strength agent, drainage aid and retention aid (cationic polymer), etc.

1. Introduction to P-1050

EPOMIN is a water-soluble polyamine polymer with high cationic density and high polarity, featuring strong reactivity.

Trade Name: EPOMIN P-1050

Appearance: Transparent viscous liquid

Molecular Weight: Approx. 70,000

Solid Content: 50% aqueous solution

Viscosity (mPa·s, 25°C): 10,000~20,000

pH (5% aqueous solution): 10~12

2. Performance Benefits

Owing to the high cationicity of PEI, a small dosage added to pulp can agglomerate fine fibers to improve drainage and pulp retention. ① Improve papermaking runnability, raise production efficiency and cut costs ② Increase retention of fine fibers and fillers ③ Enhance drainage performance and reduce water and steam consumption ④ Improve paper strength ⑤ Boost fixation of fillers and strength agents ⑥ Reduce water consumption for white water purification ⑦ Alleviate the load on wastewater treatment facilities

3. Drainage Performance

1. Drainage performance of various pulp types at different dosages The data below shows results at a dosage of 0.05%, with values above 100 cc. The standard dosage is 0.05~0.08%. This effect varies with pulp type, especially for NUKP.
2. PEI Dosing Method and Addition Points
   The effectiveness varies greatly depending on whether the PEI addition point is appropriate. This requires careful attention.
   ① Dilute with water at least 100 times before dosing.
   Dilution procedure:
   ② Add PEI while the pulp is being thoroughly agitated.
3. Toxicity Data The acute oral toxicity of EPOMIN P-1050 is 8 g/kg (rat). From a toxicological perspective, it falls in the category of slightly toxic to practically non-toxic.
4. FDA Compliance FDA permits the use of EPOMIN at pH 4.5 or above, with a maximum dosage not exceeding 5 wt%. §176.170 (Components of paper and paperboard in contact with aqueous and fatty foods) §176.180 (Components of paper and paperboard in contact with dry food)

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