Fatty acid monoglycerides are a valuable component of the products of various industries. The emulsifying ability of monoglycerides is used in cosmetic, pharmaceutical, and food production. The process of fatty acid monoglycerides obtaining by the reaction of vegetable hydrogenated fat (salomas) with glycerol (glycerolysis method) has been studied. Potassium glycerate is used as a catalyst, which is characterized by high efficiency and safety of production and use. A feature of the work is the study of the dependence of the yield and melting point of monoglycerides on the technological parameters of glycerolysis. As a raw material, hydrogenated refined fat according to DSTU 5040 (CAS Number 68334-28-1) was used: melting point – 48 °C, mass fraction of moisture and volatile substances – 0.08 %, acid value – 0.25 mg KOH/g, peroxide value – 2.8 ½ O mmol/kg. In all experiments, the glycerolysis temperature was 180 °C, the catalyst concentration – 0.5 % in terms of metal. Rational conditions for glycerolysis were determined: duration (90 min.) and glycerol concentration (50 %). Under these conditions, the monoglycerides yield was 32.9 %, melting point – 61.5 °C. The mass fraction of free glycerol in monoglycerides was 1.0 %, acid value – 2.2 mg KOH/g. The efficiency of monoglycerides obtaining using potassium hydroxide and glycerol mixture as a catalyst under certain rational conditions has been studied. The monoglycerides yield of 30.1 %, melting point of 59 °C were obtained. Therefore, the use of potassium glycerate catalyst is more efficient. The results of the study make it possible to improve the technology for the production of fatty acid monoglycerides using a new catalyst and use resources rationally

Technogenic development of society has caused widespread use in the system «man – production environment» and the system «man – household environment» of household electrical equipment, industrial electrical installations. Failure to comply with the regulated rules of electrical safety of electric current leads to electrical injuries. Designs of electrical installations, equipment, electrical protective measures are constantly being improved. But the level of electrical injuries in Ukraine and abroad tends to increase. This leads to social and economic losses as a result of economic costs in accidents, employee deaths, loss of working time and so on. The most objective indicator of injury is fatal. Thus, the level of fatal injuries at work per 1,000 workers in the developed world compared to the same rate in Ukraine in the UK is 10 times less, in Japan 7 times less, in the US 3 times less. This situation requires analysis and development of appropriate measures to reduce the level of electrical injuries. The analysis of statistical data revealed that the highest level of electrical injuries is observed in the following areas: - in agriculture; - service sector; - in public utilities; - in everyday life. At the same time, the tendency of its growth in the non-productive sphere and the household sector is expressed. So, at present in the general list of accidents from action of an electric current household electric injuries make the largest part – more than 46%. This is due to the insufficient level of education of the population on electrical safety, operation of electrical equipment in high-risk areas or in particularly dangerous by the degree of electric shock. At the same time, the level of domestic electrical injuries is higher in rural than in urban areas. It was also found that the greatest danger is posed by mobile and portable electrical installations, power tools and internal wiring. In addition, the housing of such electrical installations is often grounded through one of the cores of the power cable, which is unacceptable. The reasons for the high level of electrical injuries also include non-compliance with regulated organizational measures to ensure occupational safety and the so-called «human» factor. To improve the situation, it is necessary to intensify and increase the level of training of the population and employees on electrical safety, development and application of more modern switching electrical protection.

The aim of the work is to develop an approach for assessing the probabilities of operational activities of civil protection units. The existing approaches to modeling operational activities do not fully meet the requirements for the accuracy of assessing the parameters of activities at a low intensity of emergency events. This fact is due to the limited data available for analysis. The existing regulatory requirements for determining the quantitative composition of subdivisions, taking into account only the number of the population, leads to an unreasonable overestimation of quantitative indicators. It was found that there is a significant unevenness in the level of provision of units with basic equipment, the range of fluctuations for different numbers of the population exceeds 25%. It was found that the approach to modeling the activities of operational units based on the queuing theory has a significant limitation due to insurmountable difficulties in assessing the parameters of activities with a relatively low intensity of the implementation of threats of various nature in the territory, namely, the impossibility of assessing the parameters of the flow of emergencies with the required accuracy. The article considers the case when up to three emergency events may occur with the involvement of up to three subdivisions. This case is characterized by nineteen situation. As a result of the conducted research the calculated ratios which allow to estimate probabilities of finding of divisions of civil protection in the course of liquidation of emergency events are received. The adequacy of the results obtained was verified by comparing the results obtained on the basis of the Markov model and considering the process of responding to emerging emergency events based on queuing. The relative error in the range of low intensity of emergencies does not exceed 2%. The practical significance of the study lies in the possibility of determining quantitative indicators of operational civil protection units in conditions of low intensity of occurrence of emergency events with a higher level of adequacy.

The article presents the results of dynamic mechanical tests of fiberglass specimens under the conditions of the effects of intense heating on them, which corresponded to the development of a slowly developing fire. It is established that with intensive heating at the initial stage of fire, the considered type of fiberglass loses its initial strength, but then, upon cooling, acquires increased rigidity, while maintaining sufficient integrity and relative structural functionality. In our view, this increase is due to the significant increase in the carbon fraction in the polymer binder with the formation of a more densely packed structure due to the formation of sites with associated aromatic fragments. At the same time, the drop in strength occurs due to the formation of a sufficient number of voids (pores and cracks), the occurrence of which is characteristic of materials of organic nature (plastics based on synthetic polymers) in the process of thermal oxidation destruction under intense heating. It is established that the degree of conservation of the load-bearing strength of the fiberglass can be arranged in the following order: bending> stretching> compression. This behavior of the material indicates the use of additional structural measures when using it as the supporting elements of construction and technological structures. The determining factor in the observed modification of the composite is the extent of the passage of the pyrolytic transformations of the polymer bond, which can indirectly be characterized by a change in the dynamic mechanical properties of the material under intense heating. The main role is played by the binder component - the epoxidized naphthalene type oligomer, whose function is reduced to the ability to play a role in the volume of the polymer matrix of coke formation germs. The above composition of components and the method of its production allows to develop polymeric composite materials without the use of additional components - flame retardants (retardants), which complicate the technology of obtaining the composite and in some cases reduce its initial physical and mechanical properties. Keywords: fiberglass, residual strength, fire aftereffect, dynamic mechanical tests, epoxidised dinaftol