Milled basalt fibers as reinforcement for polyurea composite spray coatings with improved thermomechanical
stability and mechanical performance (in English)
Polimery 2020, No 3, 184
The novel polyurea-based (PUA) composites modified with milled basalt fibers (BMF), formed with spray coating technology were produced. The addition of 5–30 wt % of BMF into commercial two-component PUA was used as a low-cost modification which allowed to significantly improve the mechanical performance, as well as thermomechanical and thermal stability of the final products. It was found that the incorporation of 30 wt % of BMF resulted in over 30% stiffness improvement and extension using temperature of the coating above 80 °C. Moreover, an increase by 25 °C in thermal stability evaluated by thermogravimetric analysis (TGA) was achieved, without significant changes in the rheological behavior of the compositions, resulting in the presence of structural defects. Finally, an evaluation of crosslink density was conducted in order to ascertain that the applied modification of the thermoset reactive fast-curing system allows to obtain fully cured products which may be used as a spray coating for hydrotechnical objects protection.