Abstract
As a result of the study, the effect of curing accelerators (heterocyclic amine and zinc-containing accelerator) on the structure, physico-mechanical and protective properties of coatings based on powder epoxy-polyester compositions was established. The introduction of accelerators into the compositions affects the depth and speed of the curing process of film formers and provides the possibility to reduce the curing temperature. It has been established that the use of heterocyclic amine accelerator is more effective than a zinc-containing catalyst. For compositions containing heterocyclic amine, a decrease in gel time and an increase in the complex of physico-mechanical and protective characteristics of the coatings are observed, which were evaluated for the resistance of the coatings to the static action of a 3 % solution of sodium chloride. It is shown that changes in the protective properties of coatings, depending on the composition, correlate with the structural parameters of the polymer film and are due to the formation of the spatial structure of the polymer with different cross-link density. The use of mixtures of the investigated curing accelerators leads to an increase in the density of the polymer spatial network. This provides high protective properties of coatings to the action of aggressive electrolytes by reducing the permeability of corrosive media into the coating material. For 5000 hours of testing there are no pockets of corrosion under a film and no significant disruption of the continuity of the coatings (bubbles, peeling, wrinkling and cracking) in comparison with the basic compositions that do not contain accelerators.
Highlights
On the structure, physico-mechanical and protective properties of coatings based on powder epoxy-polyester compositions was established
It has been established that the use of heterocyclic amine accelerator is more effective than a zinc-containing catalyst
For compositions containing heterocyclic amine, a decrease in gel time and an increase in the complex of physico-mechanical and protective characteristics of the coatings are observed, which were evaluated for the resistance of the coatings to the static action of a 3 % solution of sodium chloride
Summary
В результате исследования установлен характер влияния ускорителей отверждения (гетероциклический амин и цинксодержащий ускоритель) на структуру, физико-механические и защитные свойства покрытий на основе порошковых эпокси-полиэфирных композиций. Содержащих гетероциклический амин, наблюдается снижение времени гелеобразования и повышение комплекса физико-механических и защитных характеристик покрытий, которые оценивались по стойкости покрытий к статическому воздействию 3 %-ного раствора хлорида натрия. Что изменения защитных свойств покрытий в зависимости от состава коррелируют со структурными параметрами полимерной пленки и обусловлены формированием пространственной структуры полимера с различной плотностью поперечных связей. Применение смесей исследованных ускорителей отверждения приводит к росту плотности пространственной сетки полимера, что обеспечивает высокие защитные свойства покрытий к действию агрессивных электролитов за счет снижения проницаемости агрессивных сред в материал покрытий. Ключевые слова: эпокси-полиэфирные порошковые краски, ускорители отверждения, время гелеобразования, тангенс угла диэлектрических потерь, структура, защитные свойства. В. Защитные покрытия на основе порошковых эпокси-полиэфирных красок, содержащих ускорители отверждения / В.
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