1. Coatings Industry: Used as a gloss enhancer and modifier in automotive topcoats and exterior architectural coatings. Improves coating gloss, adhesion, hardness, and water resistance.

2. Water Treatment: Used to prepare high-molecular-weight cationic flocculants for wastewater treatment.
Adsorbs and aggregates negatively charged suspended particles and pollutants in water through positive charge interaction.

3. Household Chemicals: Copolymerized with vinylpyrrolidone as a styling resin in hairsprays.
Provides styling functionality.

4. Pulp and Paper Industry: Used as a retention and drainage aid.
Enhances paper production efficiency and quality.

5. Rubber Industry: Serves as a reinforcing agent in styrene-butadiene rubber.
Improves rubber material properties.

6. Textiles and Adhesives: Serves as a modifier to enhance product properties.
Improves adhesion and other characteristics.

7. Biomedicine and Drug Delivery: Used in preparing smart hydrogels, gene delivery systems, and tissue engineering scaffolds.
Leverages its pH/temperature responsiveness for controlled drug release; its cationic nature enables binding and delivery of DNA/RNA.

8. Agricultural Chemistry: As a component in pesticide deposition enhancers, it helps pesticides adhere more effectively to crop leaves.
Improves pesticide utilization efficiency.

9. Advanced Materials Preparation: Used in preparing antimicrobial materials, sensor platforms, and stimulus-responsive nanocarriers.
Leverages its antimicrobial properties after quaternization, ability to bind with nanoparticles, and environmental responsiveness.