PAINTS & COATINGS
OUR PRODUCTS FOR PAINTS & COATINGS
ADDIGUP® AW is an additive based on few-layer graphene GUP® specifically designed to provide superior physical and mechanical properties to water-borne paints and coatings while retaining mechanical properties, minimally impacting the rheological properties of the host material and without a significant increase in viscosity. ADDIGUP® AW is added to the host material to be processed. The recommended loading rate of ADDIGUP® AW is in the range of 3-10 wt% calculated on the weight of the host material. The above-recommended levels can be used for orientation. Optimal levels are determined through a series of laboratory tests.
ADDIGUP® AW is used in all formulations that require superior corrosion protection and thermal dispersion on high-tech applications with extensive warranties. The best results are achieved for systems with DFT > 50 mm. It can be used in a wide variety of resin systems. Combinations with other active anti-corrosive pigments are possible and may be advantageous in specific cases, maximizing the potential of creating a synergistic effect with graphene.
ADDIGUP® AS is an additive based on few-layer graphene GUP® specifically designed to provide superior physical and mechanical properties to solvent-borne paints and coatings, minimally impacting the rheological properties of the host material and without a significant increase in viscosity. ADDIGUP® AS is added to the host material to be processed. The recommended loading rate of ADDIGUP® AS is 3-10 wt% calculated on the weight of the host material. The above-recommended levels can be used for orientation. Optimal levels are determined through a series of laboratory tests.
ADDIGUP® AS is used in all formulations that require high thermal dissipation and superior corrosion protection on high tech applications with extensive warranties. The best results are achieved for systems with DFT > 50 mm. Can be used in a wide variety of resin systems. Combinations with other active anti-corrosive pigments are possible and may be advantageous in specific cases, maximizing the potential to create a synergistic effect with graphene.
Pipelines & Storage Tanks
Facades & Interiors
Synergistic Effect of GUP® with Zinc
Graphene GUP® has a large lateral size ( ~ 40 μm) and a low thickness of around 1.02-1.8 nm; when incorporated in composite coatings creates an extraordinary physical barrier, and it can retard the penetration process by providing a ‘‘tortuous diffusion path” for corrosion agents.
Moreover, sluggish electrolyte penetration and low water uptake in composite coatings can dramatically enhance their corrosion inhibition performance. In terms of the intrinsic structure, graphene with a high aspect ratio and a low amount of defects typically tends to provide better shielding protection. Besides serving as a labyrinth physical barrier, graphene can also reduce the pore defects in the organic coatings.
The chemo-physical interplay between the graphene nanosheets and the polymer molecules may result from chemical bonding, van der Waals forces, p-interactions (i.e., noncovalent interactions), or electrostatic interactions. Additionally, the conformation of graphene within composite coatings, namely, dispersion, alignment, and continuity of the reinforcement phase in the matrix space, is crucial for achieving maximum corrosion resistance. The well-dispersed graphene sheets with vast interfacial areas can affect the behavior of the surrounding polymer resin for several radii of gyration, even at ultra-low volume fractions, leading to the formation of a co-continuous network that significantly alters the polymer chains. Aligning graphene nanosheets in a specific direction within the three-dimensional coating matrix enables to obtaining an anisotropic composite coating.
Zinc-rich primers (ZRPs) are some of the most widely used and effective materials for protecting steels against corrosion. Their anti-corrosion properties mainly depend on cathodic protection by sacrificial anodic dissolution and barrier protection by forming a stable layer of zinc oxidation products. Cathodic protection is only active for a short period due to the loss of the electrical contact between the spherical zinc particles and steel substrates, therefore, high zinc content is necessary to ensure electrical conductivity. Nevertheless, the utilization ratio of the zinc particles is very low due to the isolated effect of the non-conductive binders. In addition, the low utilization of zinc powder results in environmental pollution and is a waste of resources. The electrical conductivity of graphene and its barrier properties improve the anti-corrosion effect not only in terms of cathodic protection performance but also in terms of active barrier.
In the presence of graphene, sacrificial protection is the predominant mechanism, which is due to the increase in the electrical connection between the zinc particles and steel substrate. The increased electrical conductivity of the coating, due to the presence of graphene, facilitates the charge transfer processes between the zinc particles and steel substrate, avoiding the formation of ferrous ions.
Graphene GUP®: innovative filler for antifouling coatings
In a marine environment, both graphene and bacteria have negative charges. When GUP® is incorporated into antifouling coatings, the negative charges of the coating are enhanced. This increases the electrostatic repulsion between the bacteria and the coatings, reducing the adhesion of bacteria.
GUP® nanoparticles have a large lateral size and high surface area, which is beneficial for loading with other nanoparticles. This leads to improved antifouling properties due to the synergistic effect. GUP® is mesoporous and has a unique layered nanostructure and super-large specific surface area, which can fully cover the surface of copper oxide particles. Therefore, on the one hand, the graphene makes the copper particles disperse homogeneously in the antifouling paints; on the other hand, the graphene also restrains the rapid release of Cu2O into seawater under the premise of minimum killing ability, which will undoubtedly prolong the antifouling periods.
Based on the synergy of the two functions above, the marine antifouling coating containing graphene and Cu2O has a preferable antifouling performance than that containing Cu2O.
Foul release coatings (FRCs), such as silicone, have poor mechanical strength, which limits their practical applications. When ADDIGUP® is incorporated into the silicone, it enhances the mechanical properties of FRCs due to the superior strength of graphene.