The Influence of the Method of Rubber Isolation From Latex on the Properties of Elastomeric Materials Based on Butadiene-Nitrile Rubbers

Dulina, O. A.; Tarasenko, A. D.; Bukanov, A. M.; Ilyin, Alexander P.

doi:10.32362/2410-6593-2017-12-4-85-90

Cited by 5 publications

(2 citation statements)

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“…Кривые вулканизации всех приготовленных резиновых смесей, включая модельную смесь, имеют схожий вид: во всех случаях отсутствует реверсия при вулканизации и очень маленький индукционный период при заданных режимах испытаний [13][14][15]. Стоит обратить внимание на смеси 1 и 2 в сравнении с модельной смесью: при добавлении продукта деструкции ПЭТ время Т90% сокращается на 21,6 и 11,6% соответственно.…”

Section: кинетика вулканизации резиновых смесейunclassified

The use of terephthalic acid diamide in rubbers based on NBR-40

Вохмянин

Vesnin

Пятина

et al. 2020

Vestn. Voronež. gos. univ. inž. tehnol.

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In the present work, the kinetics of aminolytic degradation of polyethylene terephthalate with a mixture of amino alcohols (monoethanolamine and triethanolamine) was studied to obtain terephthalic acid diamide (N, N'-bis (2-hydroxyethyl) terephthalamide).The degradation reaction was carried out at atmospheric pressure and periodically stirring the reaction mass, followed by purification of the product by recrystallization.The dependence of the yield of the target product (N, N'-bis (2-hydroxyethyl) terephthalamide) on the reaction time and temperature, as well as on the ratio of the components, was revealed. The possibility of using diamide as one of the components of rubbers to expand the ingredient base in the rubber industry is considered. The effect of the obtained diamide on the kinetics of vulcanization of rubbers based on nitrile butadiene rubber (NBR-40) was studied, and the physicochemical and physicomechanical properties of the obtained vulcanizates were examined. In a similar way, the effect of an oligomer obtained by polycondensation of this terephthalic acid diamide was studied. The choice of SKN-40 rubber as the basis is due to the high polarity of the rubber and its good compatibility with the obtained terephthalic acid diamide and its oligomer.The accelerating effect of terephthalic acid diamide in combination with 2-mercaptobenzothiazole (MBT) on sulfur vulcanization of rubbers based on NBR-40 was revealed. The time to reach the optimum vulcanization is reduced by 4 min. In the case of using only terephthalic acid diamide, without the use of common accelerators, the optimum point of vulcanization shifts toward a longer time.In the case of using only terephthalic acid diamide, without the use of common accelerators, the optimum point of vulcanization shifts toward a longer time. Introduction diamide of terephthalic acid or its oligomer results in a change of physical and mechanical properties of the rubber - strength at break and elongation at break. The kinetics of the swelling of the resulting rubbers in toluene and gasoline was studied for four hundred hours. A decrease in the degree of swelling of vulcanizates in gasoline was observed with the introduction of terephthalic acid diamide instead of the zinc oxide vulcanization activator. Possible options for further application and use of the obtained terephthalic acid amide and its oligomer are considered.

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Section: кинетика вулканизации резиновых смесейunclassified

The use of terephthalic acid diamide in rubbers based on NBR-40

Вохмянин

Vesnin

Пятина

et al. 2020

Vestn. Voronež. gos. univ. inž. tehnol.

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“…Ранее в работах [4,5] авторами затрагивалась тема влияния ПАВ на свойства БНК с содержанием нитрила акриловой кислоты (НАК) 40%, синтезированных с применением различных эмульгаторов. Целью данной работы было изучение и оценка влияния остаточных количеств эмульгаторов и их производных на технологические свойства БНК и технические свойства резин на их основе.…”

Section: Introductionunclassified

The Influence of Residue Emulsifier Amounts on Properties of Nitrile Rubbers and Elastomeric Materials Based on Them

et al. 2018

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The paper considers the properties of a number of commercially available Russian nitrilebutadiene rubbers (NBR) containing approximately the equal acrylonitrile amount (from 26 to 33%) in the macromolecule, but differing in the method of synthesis and isolation. The assessment ofthe influence of residual emulsifier content and also such surfactants as rosin and stearic acid introduced as technological additives on some NBR properties was performed. The technological properties of model compounds based on these NBR, in particular, Mooney viscosity, minimal and maximal torques during curing, and scorching time were determined. It was shown that both residual emulsifier amounts and introduced surfactants decrease the viscosity of the compounds and increase the curing time. It was noted that rosin acts in a different manner in comparison with stearic acid. In particular, stearic acid acting as an interstructural plasticizer affects viscosity decrease in a greater degree. The mechanical performance of vulcanizatesbased on rubber compounds considered in the paper was also determined. It was shown that the surfactants effect on the mechanical properties is negligible and is within the measurement accuracy. Nevertheless, the NBRs obtained with various emulsifiers differ essentially and can’t be replaceable without revising both the rubber compounds recipes and processing parameters. The vulcanizates resistance to some organic solvents and water was also studied. It was shown that the acrylonitrile content in the rubber macromolecule is the key factor affecting the resistance to non-polar solvents. At the same time it was found that the vulcanizates containing residual emulsifier amounts tend to the swelling index increase. In general, the surfactants effect on the swelling index is ambiguous, and it requires deeper research.

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