Fireproof coating anti-corrosion and anti-mold agents extend the shelf life
The anti-corrosion and anti-mold agents in fireproof coatings are key additives that ensure the performance of the coatings and extend their service life. Their mechanism of action, component characteristics and practical application scenarios can be summarized as follows:
I. Core Mechanism of Action
Anti-corrosion principle
Inhibiting microbial metabolism: By interfering with the enzyme systems or genetic mechanisms of molds and bacteria, destroying their cell membrane structures, blocking nutrient absorption and energy metabolism, and ultimately leading to the death of microorganisms. For instance, fungicides can denature proteins, inhibit transaminase activity, and prevent mold from surviving through other pathways.
Block nutrient sources: Remove residual organic substances such as sugar, protein and fat in the coating to reduce the basis for microbial reproduction. For instance, during the leather-making process, the residue of nutrients inside the leather is reduced through technological control.
Forming a physical barrier: The special structure of fireproof coatings (such as the honeycomb-like carbonized layer of intumescent coatings) can prevent the penetration of external chemicals and moisture, indirectly protecting the substrate from corrosion.
The synergistic effect of anti-mold and anti-corrosion
Preservatives mainly target the wet environment inside the tank (such as during the storage stage of coatings) to inhibit bacterial growth. Fungicides act on the dry film state to prevent mold from growing on the coating surface. The combination of the two can achieve full life-cycle protection.
For instance, the anti-mold agent added to water-based fireproof coatings should reach equilibrium within 24 hours after mixing the paint to prevent problems such as "fish eyes" and "loss of gloss" caused by foam, while ensuring long-term anti-mold effect.
Ii. Main Components and Characteristics
Traditional fungicides
Heavy metal compounds, such as organommercury and organotin, have strong antibacterial capabilities but high toxicity and have gradually been phased out.
Replacing aromatic hydrocarbons and heterocyclic compounds: Currently the mainstream choice, it features high efficiency, low toxicity or non-toxicity, and meets environmental protection standards.
New type of compound fungicide
Compound formula: Use two or more fungicides in combination to expand the antibacterial spectrum and enhance the effect. For instance, the combination of carbendazim (benzimidazole, methyl carbamate) and chlorothalonil (tetramethylbenzonitrile) can simultaneously inhibit both molds and yeasts.
Nanotechnology: Enhance the stability of fungicides in coatings through nanoscale dispersion and extend their action time. For instance, the application of nano-silver antibacterial agents in plastics and coatings.
Compatibility with fire-resistant components
Fungicides should be compatible with the film-forming agents of fireproof coatings (such as organic resins, inorganic adhesives), flame retardants (such as expanded vermiculite, aluminosilicate fibers), and other components to avoid affecting the fire resistance performance. For instance, in water-based fireproof coatings, fungicides, thickeners, dispersants and other additives work together to ensure workability and stability.
