Development opportunities of Phenalkamine curing agent produced from CNSL

Among today's coating technologies, epoxy paint is still one of the most important industrial protection solutions thanks to its good adhesion, corrosion resistance, high mechanical strength and chemical resistance.

The demand for epoxy paint is especially high in the fields of marine, offshore construction, oil and gas, industrial floors, transportation, tanks, pipelines, wharfs and wastewater treatment plants. According to industry estimates, the global marine and protective coatings market will be worth approximately $20 billion by 2024 and is expected to reach nearly $27 billion by 2031. This growth is driven by new infrastructure investment, as well as the need to maintain and rehabilitate degraded industrial assets worldwide.

Phenalkamine – High-performance hardener for paints epoxy

The effectiveness of an epoxy coating system depends not only on the epoxy resin but is also greatly influenced by the curing agent used in the formulation. Phenalkamine is a specialized epoxy curing agent produced from Cashew Nut Shell Liquid (CNSL), a renewable resource obtained from cashew shell by-products.

Phenalkamine technology combines the reactive properties of the amine group with the hydrophobic structure of cardanol derived from CNSL. This special molecular structure brings many important advantages:

• Quick curing, shortening the time to put the project into use
• Able to cure at low temperatures
• Works well in high humidity conditions
• Good adhesion on steel, concrete and many other surfaces
• Good adaptability to wet surfaces or surfaces that have not been perfectly treated
• Ability High resistance to water, chemicals and corrosion
• Good flexibility and long-term durability

Thanks to these properties, epoxy coating systems using phenalkamine curing agent are especially suitable for marine and protective coating applications in harsh environments. The product can be used for ships, offshore drilling rigs, tanks, industrial equipment, steel structures, pipes, concrete floors, seaports and coastal constructions.

Phenalkamine curing agent also helps paint manufacturers improve operating efficiency. Rapid curing can shorten the time between coats, increase production line speeds, reduce downtime and help the project return to use sooner. In forced curing applications, phenalkamine can also help reduce curing temperatures and save energy.

Sustainability is reshaping the coatings industry

Coating manufacturers around the world are under increasing pressure to reduce volatile organic compound (VOC) emissions, improve material use efficiency, reduce dependence on fossil fuels and increase the content of renewable materials in their products. These requirements are driving the development of high-solids, solvent-free and water-based coating systems.

CNSL-derived phenalkamine technology directly responds to this shifting trend. Cashew shells are a byproduct of the cashew processing industry. Converting CNSL into high-value chemical feedstocks contributes to utilizing by-products, improving resource efficiency and promoting a circular bioeconomy.

However, it should not be claimed that the entire epoxy coating system using phenalkamine is completely of biological origin, because traditional epoxy resins and some other ingredients in the formulation may still be of fossil origin. Nevertheless, partial replacement of petroleum-based curing agents with phenalkamine produced from CNSL could increase the proportion of renewable feedstock and support the development of more sustainable paint formulations.

Recent advances in water-based and solvent-free phenalkamine technology continue to expand the market potential. These product systems can combine the environmental benefits of reduced VOC emissions with the durability needed for applications in concrete, vehicles, marine structures and heavy industries.

Opportunities in regional markets

Asia-Pacific continues to be an important growth region driven by industrialization, shipbuilding, infrastructure construction and expanding manufacturing capacity. Europe and North America are increasingly focusing on technology with low VOC content, long service life, reduced carbon emissions and the use of renewable raw materials. Meanwhile, the Middle East continues to generate large demand from oil and gas, petrochemical, seawater desalination, maritime and infrastructure projects.

This trend creates significant opportunities for cashew producing countries, especially Vietnam, to develop from supplying raw CNSL to deeper participation in the high-value chemical supply chain. With large cashew processing capacity and abundant cashew shell resources, Vietnam has the potential to become an important supplier of CNSL products, cardanol and phenalkamine raw materials for the global coating industry.

Market outlook

Phenalkamine is expected to play an increasingly important role in the next generation of epoxy coatings. The product's market potential comes from the combination of two essential values: reliable technical performance and renewable raw material content.

As paint manufacturers seek solutions that are fast curing, resistant to corrosion, well adapted to surface conditions, energy efficient and enhance sustainability, phenalkamine derived from CNSL offers a strong technical and commercial proposition.

This is more than just a alternative curing agent for traditional epoxy systems but also a strategic bridge between the global cashew processing industry and the sustainable industrial paint market, with high durability and lower environmental impact.