Epoxy accelerator DBU: “Guardian” of chemical equipment protection

In the chemical industry, the corrosion resistance and durability of equipment are the key factors that determine its service life. Epoxy promoter DBU (1,8-diazabicyclo[5.4.0]undec-7-ene), as a highly efficient catalyst, plays an important role in the curing process of epoxy resin. It can not only significantly improve the curing speed of epoxy resin, but also improve the mechanical properties, heat resistance and chemical stability of the cured substances, thereby effectively extending the working life of chemical equipment.

Basic Characteristics and Mechanism of DBU

What is DBU?

DBU is a colorless or light yellow liquid with a strong irritating odor. It contains two nitrogen atoms in its chemical structure, forming a special bicyclic system. This unique molecular structure imparts DBU strong alkalinity and excellent catalytic capabilities, making it an ideal choice for epoxy resin curing reactions. The melting point of DBU is -6℃, the boiling point is 237℃, the density is about 0.94g/cm³, and it has good solubility and can be intersoluble with a variety of organic solvents.

The mechanism of action of DBU

DBU accelerates its ring-opening polymerization by providing protons to epoxy groups, thereby promoting the curing process of the epoxy resin. Specifically, DBU first reacts with the hydroxyl group in the epoxy resin to form an intermediate, and then the intermediate further initiates the ring-opening polymerization of the epoxy groups, and finally forms a crosslinking network structure. This process not only improves the curing efficiency, but also enhances the various physical and chemical properties of the cured substance.

The application of DBU in chemical equipment protection

Improve the corrosion resistance of the equipment

Chemical equipment is exposed to various corrosive media for a long time, such as acid, alkali, salt solutions, etc., which are prone to corrosion and damage. Using DBU catalyzed epoxy coatings can significantly improve the corrosion resistance of the equipment surface. This is because DBU promotes the sufficient curing of epoxy resin and forms a dense protective layer, effectively blocking the invasion of corrosive substances.

IncreaseStrong equipment mechanical strength

DBU can not only speed up the curing speed, but also optimize the microstructure of the cured substance, thereby enhancing the mechanical strength of the equipment. Studies have shown that the tensile strength, bending strength and impact toughness of epoxy coatings treated with DBU have been significantly improved. This allows chemical equipment to withstand higher working pressures and more complex working conditions.

Improve the thermal stability of the equipment

Under high temperature environments, ordinary epoxy coatings may experience softening, cracking and other problems, affecting the normal operation of the equipment. The presence of DBU can increase the glass transition temperature (Tg) of the epoxy resin and enhance its thermal stability. Experimental data show that the Tg of the epoxy coating after adding DBU can be increased from the original 80℃ to above 120℃, greatly broadening the application range of the equipment.

Status of domestic and foreign research

Domestic research progress

In recent years, domestic scholars have conducted in-depth research on the application of DBU in epoxy resin curing. For example, a research team from the School of Materials Science and Engineering of Tsinghua University found that adding DBU in moderation can not only shorten the curing time, but also significantly improve the overall performance of cured substances. In addition, they also explored the synergistic effects of DBU and other additives, providing a theoretical basis for further optimizing the epoxy coating formulation.

International Research Trends

In foreign countries, DBU research is more systematic and extensive. DuPont has developed a high-performance epoxy coating based on DBU, which has been successfully applied to the field of anti-corrosion in oil pipelines. BASF, Germany, focuses on the application of DBU in electronic packaging materials and has achieved remarkable results. These research results show that DBU has great potential for application in different fields and is worth further exploration.

Conclusion

To sum up, epoxy promoter DBU plays an irreplaceable role in the protection of chemical equipment due to its excellent catalytic performance and multifunctional advantages. By improving the corrosion resistance, mechanical strength and thermal stability of the equipment, DBU effectively extends the working life of the equipment, reduces maintenance costs, and improves production efficiency. In the future, with the continuous advancement of science and technology, I believe DBU will show its unique charm in more fields and make greater contributions to the development of human society.

As a scientist said, “DBU is like a silently dedicated gardener, using its magical power to cultivate flowers of chemical equipment that grows vigorously.” Let us look forward to this “gardener”‘s more exciting performance on the future chemical stage!

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