Use cases and specific amounts of nanocellulose as additives in anticorrosion coatings

The application of nanocellulose in anticorrosion coatings is increasingly attracting attention, mainly because it can improve the mechanical properties of the coating, increase shielding effect, reduce the permeability of water vapor and oxygen, thereby enhancing anticorrosion properties. Here is some information about the use cases and typical additions of nanocellulose in anticorrosive coatings:

1. Improve mechanical strength and adhesion

Nanocellulose , especially cellulose nanofibers (CNF), can effectively increase the mechanical strength and adhesion of the coating due to its high specific surface area and high strength properties, thereby extending the service life of the coating.

• Case : Adding 0.5% to 2.0% (mass fraction) of cellulose nanofibers to the epoxy resin coating can significantly improve the tensile strength and wear resistance of the coating, making it more suitable for anti-corrosion scenarios.

2. Improve shielding performance and reduce penetration

The aspect ratio and dispersion of nanocellulose can form a 'maze'-like structure in the coating, thereby increasing the path length of water vapor and oxygen through the coating, reducing their permeability and improving corrosion resistance.

• Case : Adding **1.0% to 3.0%** nanocellulose to the polyurethane coating helps significantly reduce water vapor transmittance (WVTR) and oxygen permeability.

3. Improve UV resistance

Nanocellulose can also improve the UV resistance of the coating, reduce the degradation of UV light on the coating material, thereby extending the service life of the anticorrosion coating.

• Case : Adding 0.5% to 1.5%** cellulose nanocrystals (CNCs) to the acrylic resin anti-corrosion coating can improve the UV aging resistance of the coating and make it more suitable for outdoor applications.

4. Environmental protection advantages as green additives

Nanocellulose is derived from renewable resources, is biocompatible and degradable, and meets the current demand for environmentally friendly materials. In addition, the high dispersion and stability of nanocellulose enables it to reduce its dependence on organic solvents and other harmful additives in the coating.

Summary of the addition quantity

The amount of nanocellulose added to the anticorrosion coating is usually between 0.5% and 3.0% (mass fraction), depending on the matrix material of the coating and the desired reinforcement effect:

• Mild enhancement (such as increased mechanical strength): 0.5% to 1.0%。

• Significantly enhanced shielding performance and corrosion resistance : 1.0% to 3.0%。

The types of nanocellulose (such as CNF, CNC) and surface modification will also affect the choice of its added amount. For example, cellulose nanofibers that have been surface carboxylated or TEMPO oxidized may require a lower addition amount to achieve the desired enhancement effect.