scholarly journals RESEARCH of ELASTOMERS properties BASED ON COMBINATION OF ISOPRENE AND NITRILE BUTADIENE RUBBERS

Author(s):  
А.А. Дьяконов ◽  
С.А. Тапыев ◽  
А.А. Охлопкова ◽  
С.А. Слепцова ◽  
Н.Н. Петрова ◽  
...  

Применение резинотехнических изделий в крайних условиях Севера ставит ряд научно-технических проблем, связанных с их надежностью и безотказностью. Основной причиной выхода из строя техники вовремя эксплуатации при низких отрицательных температурах является потеря работоспособности уплотнительных резин по причине низкой морозостойкости. Одним из способов решения данной проблемы является разработка резиновых смесей на основе двух или более каучуков, обладающих высокимизначениями морозо- и агрессиво- стойкости. В работе приведены результаты исследования эластомеров на основе комбинации изопренового каучука марки СКИ-3 и бутадиен-нитрильного каучука марки БНКС-18. В результате проведённых исследований установлено, что при разных соотношениях каучуков СКИ-3 и БНКС-18 в резиновой смеси происходит изменение упруго-прочностных свойств эластомеров, стойкости к углеводородным средам, модуля упругости, твердости, плотности, остаточной деформации сжатия и износостойкости. При исследовании на дифференциально-сканирующем калориметре были выявлены две температуры стеклования у резин на основе комбинации каучуков. При помощи электронного микроскопа были получены снимки в объеме образцов, на которых наблюдается фазовая морфология резин, которая в зависимости от соотношения каучуков в смеси более характерна для бутадиен-нитрильного или изопренового каучуков. Также отмечено, что поверхность трения резины на основе БНКС-18 обладает наиболее шероховатойструктурой по сравнению с резиной с большим содержанием каучука СКИ-3. The use of rubber products in the extreme conditions of the North creates a number of scientific and technical problems associated with their trustworthiness and reliability. The main reason of equipment failure during operation at low negative temperatures is the performance loss of sealing rubbers due to low frost resistance. One of the ways to solve this problem is the development of rubber compounds based on two or more types of rubber with high values ​​of frost and aggression resistance. This article presents research results of elastomers based on a combination of isoprene rubber IR and nitrile butadiene rubber NBR. As a result, it was discovered that at different ratios of IR and NBR rubbers in a rubber compound, there is a change in the elastic-strength properties of elastomers, resistance to hydrocarbon media, elastic modulus, hardness, density, residual compression deformation and wear resistance. In the research of differential scanning calorimeter, two glass transition temperatures were identified as rubbers based on a combination of rubber. Using electronic microscope, images were obtained in the volume of samples, which is the phase morphology of rubbers is observed, which is depending on ratio of rubber in the mixture is more specific for nitrile butadiene or isoprene rubber. It was also noted that the friction surface of rubber based on NBR has the roughest structure compared to rubber with a high content of IR rubber.

2019 ◽  
Vol 816 ◽  
pp. 192-196
Author(s):  
Alsou D. Nasertdinova ◽  
A.D. Dementev ◽  
A.D. Khusainov ◽  
Svetoslav Isaakovich Volfson

The effect of the type and dosage of sulfur and resin (alkyl phenol formaldehyde resin grade SP - 1045) vulcanizing systems on the oil and petrol resistance and elastic strength properties of thermoplastic vulcanizates (TPV) obtained on the basis of nitrile-butadiene rubber and ABS-plastic, with a ratio of 70/30 respectively has been studied. In the course of studies of vulcanization characteristics, it was found that with an increase in the content of the vulcanizing system, the rate of vulcanization increases both during the vulcanization of rubber compounds and during dynamic vulcanization. The physic-mechanical properties of the TPV obtained indicate that with a fascination for the content of the vulcanizing system, the elastic-strength properties and the oil and petrol resistance of the TPV are also increased.


2013 ◽  
Vol 13 (2) ◽  
pp. 40-43
Author(s):  
Natalia Meissner ◽  
Władysław M. Rzymski

Abstract In this work, composites made from styrene-butadiene rubber and short fibers were prepared by mixing and investigated. The influence on the vulcanization process and tensile strength properties has been studied and compared with compounds filled with carbon black. The presence of fibers gave shorter curing time and led to a slight increase in tensile strength but decreased the elongation at break of the compound.


2021 ◽  
Vol 13 (6) ◽  
pp. 3219
Author(s):  
Hynek Lahuta ◽  
Luis Andrade Pais

This contribution presents results from a series of compression and undrained triaxial tests to study the mechanical behavior of dump clay from the north of Bohemia. The use of these materials as a foundation for construction can’t be achieved without the adoption of some precautions. This comes from embankment, formed by digging the ground (altered claystone), up to the level of coal mining which is in a sub horizontal stratigraphic layer. A potential static liquefaction behavior was observed in undrained tests for high confinement stress. A structural collapse was noticed with the results obtained in the triaxial test. This collapse is characterized by an unexpected large decrease in deviator and mean effective stress. The soils formed have strength properties that are potentially dangerous. These concepts can improve the use of these kinds of soils in geotechnical engineering work. It continues and expands the results obtained in previous research, especially the future problematic use of these materials as the foundation soil for line or building structures.


2020 ◽  
Vol 39 (1) ◽  
pp. 81-90
Author(s):  
An Zhao ◽  
Xuan-Yu Shi ◽  
Shi-Hao Sun ◽  
Hai-Mo Zhang ◽  
Min Zuo ◽  
...  

2021 ◽  
Vol 0 (2) ◽  
pp. 36-43
Author(s):  
N.V. Shadrinov ◽  
◽  
A.A. Khristoforova ◽  

The results of the study of the complex of properties of an elastomeric composite material based on nitrile butadiene rubber BNKS-18 and ultrahigh molecular weight polyethylene are presented. The effect of UHMWPE on the vulcanization characteristics of rubber compounds, the physicomechanical properties of vulcanizates before and after thermal aging in a hydrocarbon environment and air, and also on the dynamic properties before and after curing are investigated.


1977 ◽  
pp. 51-73
Author(s):  
Emil M. Friedman ◽  
Richard G. Bauer ◽  
Diego C. Rubio

2017 ◽  
Vol 44 (5) ◽  
pp. 25-28 ◽  
Author(s):  
A.A. Zuev ◽  
L.R. Lyusova ◽  
N.P. Boreiko

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.


Author(s):  
O. V. Karmanova ◽  
S. G. Tikhomirov ◽  
E. V. Lintsova ◽  
L. V. Popova

Studies of experimental adhesion modifiers based on a mixture of fatty acids from the production of light vegetable oils. The properties of rubber compounds and their vulcanizates obtained using experimental adhesion promoters KK with cobalt content from 7.5 to 16.5% are investigated. The plastic-elastic and vulcanization properties of the properties of breaker rubber compounds based on polyisoprene, the physical and mechanical properties of breaker rubbers and the bond strength in the “rubber-brass-plated steel cord system” were studied. When testing belt rubbers containing experienced adhesion promoters or an imported analog of Manobond 680C, the following features were revealed. The plasticity of the prototypes was in the range of 0.2-0.4. This indicates satisfactory processing properties. The Mooney viscosity of the prototypes was lower than that of the production sample. The use of experienced adhesion promoters instead of the analogue (Manobond 680C) increases the resistance to scorching. On the basis of the analysis of elastic-strength properties, it was found that in terms of the conditional tensile strength, the prototypes were inferior to the serial ones. However, rubbers containing the KK-12, KK-13.5, KK-15 promoters met the control standards. The tensile elongation at break of the experimental rubbers is higher than that of the serial sample. This may indicate the formation of a more uniform cure network in the presence of the test products. When testing rubber-metal-hard composites, it was noted that, under normal conditions, the experienced adhesion promoters have advantages over Manobond 680C. However, at elevated temperatures, under conditions of salt and steam-air aging, they are slightly inferior to Manobond 680C. It has been established that the experimental adhesion promoters provide the required set of technical properties of belt rubbers with a CO2 + content of 12–16.5% wt. Thus, it is possible to recommend the adhesion promoters KK 12, KK-13.5, KK 15 for practical use in the composition of belt rubber compounds. This will allow replacing a foreign-made product and reducing the cost of production.


2008 ◽  
Vol 81 (2) ◽  
pp. 297-317 ◽  
Author(s):  
Saeed Taghvaei-Ganjali ◽  
Fereshteh Motiee ◽  
Farsa Fotoohi

Abstract Thermal analysis provides a successful technique for the characterization and identification of rubber compounds. In this study, TGA (thermogravimetric analysis) and DTG (TGA derivative) profiles are used to predict and define the physico-mechanical properties of natural rubber — butadiene rubber (NR / BR) blends, using their thermal behaviors. DTG curves of vulcanizate showed that the initial degradation temperature of NR is lower than BR. According to TGA-DTG profiles we have demonstrated two useful factors, ΔTmax (Tmax BR100−Tmax BRX) and peak height ratio of NR-BR blends which are correlated with physico-mechanical properties of blends.


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