Polyethyleneimine (PEI) is one of the most versatile cationic polymers used in multiple industries, including water treatment, coatings, paper, textiles, and biotechnology. As a leading polyethyleneimine manufacturer in China, we focus on providing consistent quality, competitive polyethyleneimine price, and reliable technical support to meet global customers’ evolving needs.

I. What Is Polyethyleneimine (PEI)?

Polyethyleneimine (CAS 9002-98-6) is a branched polymer composed of repeating ethyleneimine units. Known for its strong cationic charge density, it serves as an excellent adhesion promoter, dispersant, and flocculant. The CAS number 9002-98-6 identifies it as a polymer that combines high reactivity and solubility across a wide range of applications.

Depending on molecular weight and structure, polyethyleneimine is available in two main types:

• Linear PEI: Known for its lower viscosity and uniform molecular structure.
• Branched PEI: Offers higher charge density and excellent reactivity, making it ideal for coatings, adhesives, and chemical modification.

II. Key Properties of Polyethyleneimine Solution

Aqueous polyethyleneimine solution provides a convenient form for industrial use. It is highly alkaline, water-soluble, and reactive with anionic compounds. Typical concentrations range from 30% to 50%, depending on specific customer requirements.

Main characteristics include:

• High cationic charge density
• Excellent adhesion to a variety of substrates
• Strong chelating and complexing ability
• Biodegradability and environmental compatibility

For users looking for biodegradable polyethyleneimine, our advanced formulations balance performance with eco-safety, supporting sustainable industrial development.

III. Major Applications of Polyethyleneimine

1. Water Treatment

One of the most common uses of Polyethyleneimine PEI is in water treatment. It functions as a highly efficient flocculant, coagulant, and metal ion chelator.

PEI removes suspended solids and heavy metals from industrial and municipal wastewater. Due to its strong cationic charge, it bridges negatively charged particles, promoting rapid sedimentation and improved water clarity.

Compared with conventional coagulants, PEI performs well even under variable pH and temperature conditions, offering long-term cost efficiency. Many environmental engineers prefer biodegradable polyethyleneimine formulations to meet green wastewater treatment standards.

2. Coatings and Adhesives

In polyethyleneimine coating applications, PEI serves as a powerful adhesion promoter between polar and non-polar surfaces. It enhances the bonding strength in multilayer coatings, inks, and laminates.

PEI improves pigment dispersion and print adhesion in paper coatings, and enhances chemical bonding in epoxy and polyurethane adhesives. Its strong film-forming ability makes it suitable for primer formulations, corrosion-resistant coatings, and flexible packaging materials.

Our polyethyleneimine manufacturer team offers customized grades to achieve optimal performance in coatings that require transparency, flexibility, or conductivity.

3. Paper and Pulp Industry

Polyethyleneimine (CAS 9002-98-6) has a long history of use in the paper and pulp industry. It acts as a wet-strength resin and retention aid, improving fiber bonding, drainage, and filler retention during papermaking.

PEI is also used as a surface sizing agent, improving paper smoothness and ink absorbency. Its strong cationic character neutralizes anionic trash and stabilizes process chemistry in recycled paper production.

Whether for high-speed paper machines or specialty paper grades, Polyethyleneimine PEI helps mills reduce chemical consumption while increasing sheet quality.

4. Oil Production

In the oil and gas industry, PEI plays a vital role as a demulsifier, corrosion inhibitor, and scale control agent. Its strong cationic functionality breaks oil-water emulsions, improving separation efficiency during crude oil processing.

Additionally, PEI can be used to modify surfaces in enhanced oil recovery (EOR) systems and as a stabilizer in drilling fluids. Its compatibility with high-salinity environments and temperature stability make it an excellent additive for upstream oilfield applications.

When you buy polyethyleneimine from a trusted supplier, you gain access to tailored grades designed for both onshore and offshore oilfield systems.

5. Emerging Functional Materials

Polyethyleneimine has become a key component in developing emerging functional materials such as nanoparticles, catalysts, and polymer composites.

In nanotechnology, PEI acts as a surface modifier to improve dispersion and interfacial bonding of nanoparticles. It can also be used as a reducing agent and stabilizer for metal nanoparticle synthesis.

Modified PEI derivatives are used to create biodegradable polyethyleneimine structures for biomedical and environmental applications. These materials show promise in controlled drug release, biosensors, and smart coatings with self-healing or anti-corrosion properties.

6. Semiconductor and Electronic Packaging

In advanced electronics, polyethyleneimine is gaining attention for use in semiconductor surface treatment, photoresist coatings, and electronic packaging materials.

As an adhesion promoter, it enhances the interface bonding between metal layers and dielectric substrates. In printed electronics and flexible circuits, Polyethyleneimine PEI improves film conductivity and mechanical strength.

Furthermore, PEI is used in dielectric modification, electrode passivation, and thin-film encapsulation, supporting high-precision manufacturing in semiconductors and optoelectronics.

IV. Why Choose a Reliable Polyethyleneimine Manufacturer?

When choosing a polyethyleneimine manufacturer, quality consistency, molecular weight control, and technical customization are key factors. As a trusted polyethyleneimine supplier in China, we ensure:

• Strict quality management: Every batch is tested for viscosity, solid content, and pH stability.
• Customization: Available in different molecular weights and concentrations to meet industry-specific needs.
• Competitive polyethyleneimine price: Direct factory supply ensures cost efficiency.
• Global compliance: Products meet REACH and ISO standards for international trade.

We also offer custom polyethyleneimine solutions to suit specific coating formulations, water treatment systems, or biopolymer blends.

V. How to Buy Polyethyleneimine

If you are looking for polyethyleneimine buy options, you can directly contact our sales team for sample testing and quotation. Our experts provide technical guidance on formulation compatibility, storage stability, and dosage recommendations.

Whether you require bulk quantities or specialized polyethyleneimine solution, we ensure timely delivery and consistent product quality for your industrial production.

VI. The Future: Biodegradable Polyethyleneimine and Green Chemistry

With increasing focus on sustainability, research and development are driving innovations in biodegradable polyethyleneimine. By modifying molecular structure and introducing natural components, the next generation of PEI offers both high efficiency and environmental safety — meeting global green chemistry trends.

As a forward-thinking polyethyleneimine manufacturer, we are committed to promoting eco-friendly materials and supporting customers’ sustainability goals.

VII. Conclusion

Choosing the right polyethyleneimine manufacturer means more than just securing a supply — it’s about partnering with a team that prioritizes quality, innovation, and environmental responsibility.

With high-purity Polyethyleneimine PEI (CAS 9002-98-6), flexible polyethyleneimine solutions, and competitive prices, we provide complete support for your industrial needs — from water treatment to coatings and beyond.

If you are searching for a trusted polyethyleneimine supplier in China, contact us today to discuss your requirements and request a quotation.