Investigation of Biostability and Fungus Resistance of Polymer Composite Materials
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stigation of Biostability and Fungus Resistance of Polymer Composite Materials M. Yu. Stepanovaa and N. I. Baurovaa, * a
Moscow Automobile and Road Construction State Technical University, Moscow, 125319 Russia *e-mail: [email protected] Received November 6, 2019; revised November 28, 2019; accepted December 19, 2019
Abstract—The results of tests of the biostability and fungus resistance of composites based on basalt material and epoxy binder with different types of curing agents under conditions of increased moisture and greenhouse effect are given. It is shown that the composite’s resistance to the action of microorganisms under conditions of increased moisture of air is substantially affected by the type of curing agent used and curing mode. The samples cured at elevated temperatures have the best bio- and fungus deterioration. Keywords: basalt-reinforced plastic, biostability, fungus resistance, polymer composite materials, curing modes DOI: 10.1134/S199542122004019X
During preparation of tanks for different products, wide recognition has been received by polymer composite materials based on fabric fillers and epoxy binder [1–3]. The main factors affecting the selection of materials for production of tanks are their safety and resistance to transported compounds, as well as biostability and fungus resistance under conditions of increased air moisture and the greenhouse effect (operating conditions for the tank inner surface). By “biostability and fungus resistance” is meant the preservation of structural and functional characteristics of an object under action of biological factors or bacteria over the whole service life [4, 5]. The mechanism of bio- and fungus deterioration is very complex: microorganisms can directly decompose the material construction, but they can also often stimulate the processes of biodeterioration [5, 6]. Based on a literature review [1, 4–10], it is supposed that the biostability and fungus resistance of composites will be mainly defined by the type of the curing agent used and the curing modes. The aim of the present work was to determine the influence of the type of the curing agent and curing modes of the composites of their biostability and fungus resistance under conditions of increased air moisture and greenhouse effect. Two sets of samples consisting of ten layers of basalt material and epoxy binder based on ED-20 resin were produced for the experimental tests. In the case of the first set of samples (set no. 1) treiethylenetetraamine (TETA) was used as a curing agent, with curing lasting for 1.5 h at 80°C. For the second set of samples (set no. 2), polyethylenepolyamine (PEPA) was used as a
curing agent, with curing being for 24 h at room temperature. These compositions were used as model ones to determine the influence of the curing mode. All samples were produced by a vacuum infusion technique. The biostability of the basalt-reinforced plastics was investigated via exposure of the samples for 90 days under conditions promoting accelerated growth of microorganisms (increased
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