Now there is not a single area of industry that can do without adhesive elastomer materials. Composites based on synthetic rubbers comprise 75% of the total volume of adhesive materials produced, which is due to the combination of unique properties typical of the elastomer base of the adhesive. The base of many imported adhesives for the bonding of rubber to metal is chlorinated natural rubber. As an alternative, chlorinated synthetic isoprene rubber has been proposed, developed at the Scientific Research Institute for Synthetic Rubber in St Petersburg. The chlorinated isoprene rubber was compared with imported chlorinated natural rubber in adhesive composites, and the physicomechanical properties of mixes based on a blend of chlorinated rubber and nitrile butadiene rubber were investigated. The investigation was conducted on chlorinated natural rubber of grade Pergut S20, chlorinated isoprene rubber SKI-3, and nitrile butadiene rubbers of grades BNKS-28AMN and SKN-26S. The influence of the ratio of chlorinated rubber to nitrile butadiene rubber and the technological factors of mix preparation on the properties of films produced from them was established. It was shown that, in terms of the level of properties, home-produced chlorinated rubber can be used as the base for adhesives for hot bonding of rubber to metal instead of imported Pergut S20.
Kinetic curves describing the processes of vulcanisation and pore formation of foam rubbers based on nitrile butadiene rubbers were studied. The curves were obtained using a D-MDR 3000 rheometer (MonTech) equipped with MonControl analytical software, which makes it possible, simultaneously with the measurement of the torque and tg δ, to determine the pressure in the chamber. The rubber compounds were noted for different stearic acid contents. The results of quantitative interpretation of the kinetic curves of processes of vulcanisation and pore formation in elastomeric materials are presented. Mathematical models for approximation of the curves of vulcanisation and pore formation, distinguished by high goodness of ft, are proposed. The relationship between the parameters of the models and the vulcanisation characteristics and the parameters of pore formation is established. The influence of the stearic acid content on processes of formation of the porous structure of foam rubbers based on blends of nitrile butadiene rubbers containing 27–30 wt% acrylic acid nitrile and polyvinyl chloride is shown.
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