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1. Primarily used as a wet-strength agent for unsized absorbent papers (such as filter paper, blotting paper, tissue paper, etc.); however, the resulting broke (waste paper) is relatively difficult to process. Furthermore, it accelerates pulp dewatering and facilitates the flocculation of fine fibers within the white water. It exhibits strong binding affinity for acid dyes and can serve as a fixing agent during the acid-dyeing of paper. It can also be used to treat cellophane, thereby reducing deformation caused by wetting. Additionally, polyethyleneimine finds applications in fiber modification, textile printing and dyeing auxiliaries, ion-exchange resins, and flocculation and sedimentation processes (e.g., metal scavenging and wastewater treatment).

2. Used as a wet-strength agent for unsized, breathable papers; it also functions as a retention aid and a beating aid during the papermaking process, helping to reduce pulp freeness (beating degree). It enhances the paper web’s dewatering efficiency, resulting in a 1% to 4% increase in paper dryness and a 5% to 20% increase in production capacity.

3. This product is a non-ionic polymer; however, in acidic media, it acquires cationic properties. It is suitable for various applications, including wastewater treatment and serving as a retention and drainage aid in papermaking.