Manufacturing and Characterization of Coatings from Polyamide Powders Functionalized with Nanosilica

Abstract

Polyamide coatings are thermoplastics with great advantages such as a good corrosion protection of the base metal and wear resistance. Their application as powder coatings is an environmentally friendly option that is currently attracting growing interest. However, during their life service, they can sometimes be exposed to conditions that they are unable to stand. In this work, a polyamide 11 (PA11) powder was reinforced with different percentages of silica nanoparticles (1–3 wt. %). Powder mixtures were prepared through extrusion followed by compression molding processes to manufacture coatings. For the coatings under study, the effect of 500 h xenon exposure was studied in order to know their ultraviolet (UV) resistance. Attenuated total reflection-Fourier transform infrared spectroscopy (FTIR-ATR) and differential scanning calorimetry (DSC) tests were performed to study changes in polymer structure and if they are affected by nanoparticles. The effect of nanoadditions and xenon exposure on hardness and stiffness were also evaluated. Furthermore, reciprocal wear tests were performed before and after irradiation, and the wear tracks were analyzed using optoelectronic microscopy and scanning electron microscopy (SEM). Finally, the aesthetic properties were measured. The results reveal improvements in mechanical and wear properties when 1% nanosilica is added to the PA11, which then become more relevant after xenon radiation exposure.

Corrosion Protection in Chloride Environments of Nanosilica Containing Epoxy Powder Coatings with Defects

“…Several studies have shown that the nanoadditions of SiO 2 allow some of the properties (such as corrosion and wear resistance) of conventional liquid epoxy coatings to be improved. An increase in the mechanical properties has sometimes been reported [22][23][24] . Other studies have focused on improvement in corrosion resistance when silica mesoporous nanoparticles have been used as nanocontainers for corrosion inhibitors 25 .…”

Low-Cost Biobased Coatings for AM60 Magnesium Alloys for Food Contact and Harsh Environment Applications

“…The samples were treated with three classes of coatings. Biobased commercial Polyamide (PA11) coatings called Rilsan ® [ 16 ], produced by Arkema (Rho, Milano, Italy) was deposited as powder coating, after heating the metallic samples at 200 °C. Four samples were prepared: 2 in a transparent version and 2 in the white one.…”

“…e.g., from castor oil, thus exploiting poor and semi-arid soils not suitable for food cultivars. It is very versatile, due to the possibilities for its functionalization with silanes [ 16 ] or for blending with poly(butadiene succinate) (PBS) to obtain a partially biodegradable matrix [ 17 ]. In addition, PA11 exhibit antibacterial properties as recently demonstrated [ 18 ].…”

Effect of additions of anticorrosive pigments on the cathodic delamination and wear resistance of an epoxy powder coating

“…This is of great interest due to current restrictions limiting volatile organic compounds (VOCs) in both waterbased and solvent-based products [2]. Some other advantages of these coatings are, for instance, the possibility of recovering 99 % of the powder lost during the coating process and the superior finish that this type of coating [3,4] has. In fact, it is considered to comply with the "4E principle" (environment, efficiency, ecology and economy) in the coating industry, making its development of special interest [5].…”