Blocked isocyanate – 2-isocyanate-phenylcarbamidemethylbenzene was synthesized and identified using IR-spectroscopy and elemental analysis researching methods. Research showed that adding 2-isocyanate-phenylcarbamidemethylbenzene in rubber compositions based on cis-isoprene synthetic rubber provides increased thermal stability and increasing adhesion comparing them to Manobond-680c.

Recycling of polymers is an important environmental task. However, during the recycling of polymers many technological problems arise because usually not only one polymer, but also mixtures of polymers are recycled. To improve technological properties, such as increasing fluidity, improving processability and quality, reducing the melt pressure in the spinneret head, addressing surface defects caused by viscosity anomaly and excessive shear stresses, preventing the formation of deposits and residue on the forming tool, increasing productivity, reducing the amount gelic, etc., use processing and technological additives. In the research, the effect of technological additives manufactured by Weihai CY Dendrimer Technology Co., Ltd (China) on the technological and thermal properties of recycled polyolefins was studied. It was shown that the technological additives improved the technological properties of recycled polymers: the mixing energy decreased when receiving compositions, the melt flow index values increased, the thermal properties did not deteriorate. The results show the possibility of using of the technological additives in production to increase the productivity of processing equipment and reducing its energy consumption.

The effect of new adhesion promoters on the bond strength of rubber compounds with rubber cord based on synthetic isoprene rubber SKI-3, as well as on the structure of their vulcanizates, is investigated. The synthesized additives were taken as adhesion promoters: 2,4-diphenylcarbamidotoluene (DPKT); 2-isocyanatophenylcarbamidotoluene (IPCT) and the industrial promoter is Manobond 680C. Tests were conducted to determine the adhesion strength to the metal cord and the density of the cross-linking of the obtained rubber compounds by the dosage of additives. It is determined that the maximum value of adhesion had mixture containing 1.2 parts by weight of 2-isocyanato-phenylcarbamidotoluene and Manobond 680C. It was found that the introduction of additives DPCT and IPCT leads to the formation of additional cross-links in the vulcanizates. Rubbers containing additives in an amount of 0.4-1.2 parts by weight have the highest density of crosslinking. The studies made it possible to hypothesize the relationship between the particle size and the electrokinetic potential of blocked urea-based isocyanates with the strength of brass-metal cord-rubber bonding. The results obtained indicate that the greater the electrokinetic potential of the synthesized additives and the lower the average particle size, the better the additive is distributed in the rubber compound and affects the formation of the adhesive layer at the brass-metal cord-rubber interface.

The influence of means and modes of sanitary-hygienic treatments on the surface condition of medical rubber stoppers based on butyl and halobutyl rubbers used for sealing injection and infusion drugs was investigated using the method of determining the contact wetting angle on a DCAT 21 tensiometer. It has been established that the methods used for sanitary-hygienic processing have a destructive effect on the state of the surface, accompanied by a decrease in the edge angle of wetting (an increase in the hydrophilicity of the surface of the stoppers), which significantly increases the possibility of interaction with the dissolved pharmaceutical substances of drugs.

The effect of blocked diisocyanates on the elastic-strength properties of elastomeric compositions based on SKI-3 isoprene rubber has been investigated. The synthesized additives are 2-isocyanato-4-phenylcarbamidotoluene (IPCT) and 2,4-diphenylcarbamidotoluene (DPCT). Tests were carried out to determine the physical and mechanical (conditional tensile strength, elongation at break, hardness) properties depending on the type and dosage of additives. It was found that samples with synthesized additives have strength and elongation at break higher than those of a sample without additives by 30 % and 200 %, respectively. There was also an increase in the tear resistance of all samples compared to the control (from 49.9 to 81.9 kN/m). An assumption is made about the formation of a network of physical connections, which provides an increase in these indicators. TMA analysis results showed a wider temperature range for reversible deformations (up to 180 °С).