The types of petroleum resins used in heavy-duty anti-corrosion coatings mainly include C5 petroleum resin and C9 petroleum resin. Below are the characteristics of these two petroleum resins:

C5 Petroleum Resin

Raw Material Source: Produced by polymerizing isoprene, cyclopentadiene, 1,3-pentadiene, and 1-pentene—obtained from the separation of cracked oil during the production of olefins from petroleum cracking—in the presence of an acidic catalyst.

Compatibility: Exhibits good compatibility with phenolic resins, terpene resins, coumarone resins, natural rubber, and synthetic rubber, particularly with styrene-butadiene rubber (SBR).

Performance Characteristics:

Thermal Stability: Maintains stability at high temperatures and is resistant to decomposition.

Chemical Stability: Demonstrates excellent chemical stability, reacting with various chemicals without deterioration.

Weather Resistance: Possesses a certain level of resistance to cold, UV radiation, and oxidation.

Film-Forming Ability: Forms a uniform and robust film upon drying, aiding in substrate protection.

C9 Petroleum Resin

Raw Material Source: Produced by polymerizing residual fractions (C8–C11) left after separating benzene, toluene, and xylene from heavy byproduct cracked oil in the presence of an acidic catalyst.

Application Characteristics:

Tackifying Properties: Can be used as a tackifying resin to enhance the adhesion and cohesion of coatings.

Chemical Resistance: Exhibits good stability against various chemicals, improving the coating’s chemical resistance.

Weather Resistance: Similar to C5 petroleum resin, it also possesses certain weather-resistant properties.

Film Formation and Anti-Corrosion: When emulsified, C9 petroleum resin emulsion can be mixed with chloroprene rubber emulsion to produce exterior wall coatings and anti-rust coatings with strong adhesion and weather resistance, demonstrating its potential in anti-corrosion coatings.

Comprehensive Features

Enhanced Coating Performance: Both C5 and C9 petroleum resins significantly improve the adhesion, chemical resistance, weather resistance, and mechanical properties of heavy-duty anti-corrosion coatings.

Environmental Friendliness: As raw materials, petroleum resins contribute to the production of environmentally friendly heavy-duty anti-corrosion coatings, aligning with modern industrial environmental requirements.

Wide Application: Due to these advantages, petroleum resins have broad application prospects in the field of heavy-duty anti-corrosion coatings, such as in shipbuilding, offshore platforms, and coastal industrial areas for the coating of steel structures exposed to highly corrosive environments.

In summary, C5 and C9 petroleum resins play a crucial role in heavy-duty anti-corrosion coatings. Their characteristics enable coatings to exhibit superior performance, meeting anti-corrosion demands in various harsh environments.