Segedin U.,Central R and D of Helios Group |
Malin F.,Central R and D of Helios Group |
Skale S.,Central R and D of Helios Group |
Znoj B.,Central R and D of Helios Group |
And 2 more authors.
Materiali in Tehnologije | Year: 2013
In the present research the synthesis of a high-solids styrene-acrylic copolymer in a high-pressure reactor is described and a comparison of its properties with those of a copolymer synthesized at atmospheric pressure are given. The described procedure enables the synthesis of styrene-acrylic copolymers with a higher solids content under elevated pressure in a significantly shorter time, when compared to the process conducted at atmospheric pressure. The elevated pressure and higher temperature of the synthesis result in a copolymer with a lower average molecular mass and a narrower molecular mass distribution as well as a lower viscosity of the solution with an equal dry weight. Synthesized copolymers were used for the preparation of the twocomponent polyurethane coatings for corrosion protection. Cross-linked films were formed with a hexamethylene diisocianate homopolymer. With electrochemical impedance spectroscopy measurements a higher level of cross-linking and a lower porosity of the two-component polyurethane coating based on styrene-acrylic copolymer synthesized in a high-pressure reactor have been determined. This implies a better anti-corrosion protection of the metal substrates.