Abstract
We examined the effect of nanosilver – ionic silver, intercalated into interlaminar spaces of montmorillonite, as a biocidal additive to antibacterial fire-protection coatings for pharmaceutical enterprises. We determined stability of intumescent coatings composed of ammonium polyphosphate/pentaerythritol/melamine/EVA/titanium oxide with additives of montmorillonite, modified with guanidine and quaternary ammonium cations as well as ions of silver in relation to mold and wood-staining fungi. It was shown that the application of a mixture of biocides – montmorillonites, modified with ions of silver and polyhexamethyleneguanidine cation, improves the class of biocidal effectiveness of coating from “not effective” to “effective. It was established that the mixture of Ag-montmorillonite and PHMG-montmorillonite demonstrated the synergistic effect against mold and wood-staining fungi and provided the “highly effective” class of biocidal effectiveness. According to data of microbiological studies, the paint, which contains in its composition the mixture of Ag and PGMG cations, exerts a disinfectant effect in relation to gram-positive and gram-negative bacteria (including tuberculosis), as well as mold fungi. Field fire studies of intumescent paints for wood with the additives of Na-MMT, TSTA-MMT, PHMG-MMT and Ag-MMT were conducted in line with GOST 16363. It was shown that the admixtures of nanoclays into water-based intumescent paints decrease the temperature of flue gases and transfer wood into group I of fire-retardant effectiveness. Results of the study allow us to recommend the introduction of the mixture (PHMG-MMT+Ag-MMT) into formulations of intumescent paints as an effective antibacterial additive. Its properties are predetermined by the suppression of proliferation of gram-positive and gram-negative bacteria, mold and wood-staining fungi.
Highlights
In the course of development of technological processes and equipment, designing, construction, reconstruction and operation of pharmaceutical enterprises, it is necessary to follow the GMP requirements and safety standards
The goal of present research is to study the influence of montmorillonite, modified with ions of silver and quaternary ammonium cations, on the resistance to biodamage of the intumescent composition (IC) of ammonium polyphosphate (APP)/pentaerythrite (PE)/melamine (MA)/copolymer of ethylenevinyl-acetate (EVA)
Dependence of degree of fire protection of intumescent compositions on the admixtures of organoclays after testing for resistance to biodamage was demonstrated by the method of testing of fire-protection efficiency according to GOST 16363-98
Summary
In the course of development of technological processes and equipment, designing, construction, reconstruction and operation of pharmaceutical enterprises, it is necessary to follow the GMP requirements and safety standards. One of the main criteria for manufacturing medicines is the cleanliness of industrial premises This predetermines special requirements for walls and internal building structures and, to finishing – varnish and paint materials (VPM). – chemical and environmental safety in the case of fire – restriction of fire and smoke propagation, minimal toxicological impact of combustion products on human health and environment;. That is why coatings for special purposes, such as antibacterial, fire-retardant and fire-protective, are becoming increasingly popular in the world market of VPM. These coatings have to be applied to meet a whole set of requirements to modern construction and various types of safety. That is why research with a focus on the creation of coatings with a set of antibacterial and fire-retardant qualities is relevant
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