CC BY
18
ISSN 2522-1841 (Online) AZERBAIJAN CHEMICAL JOURNAL No 3 2020 67
ISSN 0005-2531 (Print)
UDC 667.678.074
THE IMPACT OF COPOLYMERS SKN-40 AND EPTP-60 ON THE PROPERTIES OF
BITUMEN COMPOSITIONS
D.S.MammadHasan-zade
Azerbaijan State Oil and Industry University
dilara.memmed1955@gmail.com
Received 23.10.2019 Accepted 05.03.2020
Rubber mixtures were prepared on the base of butadiene-nitrite rubber SKN-40 (butadiene-nitrite rubber), copoiymer EPTP-60 (ethyiene-propyiene tripie copoiymer), poiyvinyichioride and MGF-9 (oiigo-ether acryiate) in the research being conducted. As a resuit, heat resistance and adhesion were increased. The obtained rubber mixtures were added to the bituminous compositions as a resuit of which such parameters as penetration and extensibiiity improved.
Keywords: rubber, bitumen composition, lumps, black oil, rubber mixture.
doi.org/10.32737/0005-2531-2020-3-67-70
Currentiy, there exist serious probiems with paving. Annuaiiy the transport ioad increases and the use of materiais with iow func-tionai quaiities ieads to the fact that every three to four years requires major road repairs.
In the iiterature there is information about a positive impact on the eiasticity and adhesive interaction of bitumen with rubbers or rubber based butadiene nitriie rubber [1, 2]. In this paper, rubber mixtures were investigated on the base of nitriie rubber butadiene SKN-40, an ethyiene-propyiene tripie copoiymer EPTP-60, poiyvinyichioride and oiigo ether-acryiate MGF-9 were additionaiiy introduced.
On the account the addition of EPTP-60, poiyvinyichioride and MGF-9, it was possibie to increase heat resistance by 3 times, as weii as, reiative eiongation to 0.73 whiie maintaining high indexes of physicai-mechanicai properties of vuicanizers.
The procedure for preparing rubber mixtures was as foiiows: the mixtures were prepared on iaboratory roiis at 30-400C. The totai mixing duration is 20-25 min. The vuicaniza-tion of rubber mixtures was carried out at 1500C for 30 min. The formuiation of rubber mixtures and physicai-mechanicai properties are given in Tabies 1 and 2 respectiveiy.
It can be seen from the data tabies, in comparison with the known rubber mixture, the coefficient of heat resistance increased from
0.3-0.4 to 1.03-1.05 reiative to the extension from 0.55-0.65 to 0.71-0.73 in the obtained mixture.
We investigated the impact of the amounts of EPTP-60 and poiyvinyichioride on the properties of rubber mixtures. It turned out that iimits from 10 to 20 mass parts are optimai, since beiow 10 and above 20 mass parts the physicai-mechanicai properties of vuicanizers deteriorate.
If MGF-9 takes iess than 3 mass parts in the rubber mixture based on the SKN-40, EPTP-60 and poiyvinyichioride, the compatibii-ity and processing of the rubber mixture deteriorates. More than 3 mass parts aiso shouid not be used, since MGF-9 has a iow moiecuiar weight, which aiso deteriorates the physicai-mechanicai properties of vuicanizers.
Table 1. Formuiation of rubber mixtures
Nomination of the components Content of components in mass parts
known rubber mixture proposed
SKN-40 100 80 60
EPTP-60 - 10 20
Poiyvinyichioride - 10 20
Stearic acid 1.5 1.5 1.5
Zink oxide 5.0 5.0 5.8
Mercaptan benzithiazole 0.8 0.8 0.8
Sulfur 1.5 1.5 1.5
Carbon 45 45 25
MGF-9 - 3 3
Table 2. Physical-mechanical indexes of vulcanizer
Nomination of indexes Indexes
1 2 3
Extendibility strength, MPa 30 28,5 29
Relative extension, % 550 530 545
Swelling in a mixture of benzene-gasoline (3:1) for 24 hours, % 14-20 16 18
Tear resistance, kN/m 72-85 82 80
Hardness in TM, cosentional unlt 72-76 69 67
Elasticity in rebound, % 15-20 22 24
Brittle point, 0C -23 -25 -27
The coefficient of heat resistance (at 1000C) on: Extendibility strength Relative extension elongation 0,3-0,4 0,55-0,65 1,03 0,71 1,05 0,73
Ozone resistance (250C, 72 h, COj=0.01, completely, deformation 20%) broken down within 2 hours not broken down not broken down
Note: 1-component mixture in mass parts by 100 mass p parts of polymer mixture SKN-40-EPTP-60-PVC.
Further to the obtained rubber mixture we added from 3-9 mass parts of PN-6m oil. The properties of the obtained rubber mixture are shown in Figure 1.
Based on the data received, in order to obtain the required vulcanized system, the ratio of the taken components should be regulated. For production, a rubber mixture of the following composition in mass parts by us was proposed:
SKI3 - 85, polyvinylchloride - 10.0, EPTP -60-50, sulfur - 2.5, ZnO - 5, captax -
5 of rubber SKN-4-M mixture of 2,3-component in mass
0.3, 4010HA - 1, neozone D -1.0, conifol - 0.5, stearic acid - 0.5, P4 - 1-2.0, rubrux - 4, technical carbon P234 - 30.
It turned out that the content of sulfur exerts a great impact on the vulcanization of the obtained mixture. At introducing to the mixture 2.5 mass parts, sulfur and 0.3 mass parts captax the cure time reduces from 20.8 to 16.6 seconds and the physical-mechanical characteristics of the compositions are improved.
Figure 2 shows the characteristics of vulcanizes depending on the sulfur content.
38 ■
34-
inn
m
e
500
400
_L
_L
38
30 ■29
■28
■24
% PN-6m
Fig.1. The main characteristics of the rubber mixture depending on the amount of oil PN-6m: 1 -change the lengthening, 2 - tensile stress, 3 -elasticity at gap.
Tension at stretching
Resistance to a gap
m inn
m
le
es n io is sn e
H
580 -
550 ' 540
50 0
22
94
1
21 /
■90
/ Si y
20 Sf Si
■80 ■
/ l/
19 -
1 1 , 75
51 & J1 tg
a
50 §
.1? ci
49 s
la
w
w.h.C
2 2.5 3.0 Fig.2. Characteristics of vulcanizers depending on the contents. 1-Tension at stretching; 2 -Tension at lengthening; 3 -Resistance to a gap; 4 - Elasticity on a gap.
6
9
3
THE IMPACT OF COPOLYMERS SKN-40 AND EPTP-60 ON THE PROPERTIES
69
The obtained rubber mixture was added to the bitumen compositions with purpose of obtaining road bitumen [3, 4].
Bituminous composition was prepared on the formulation [5].
In the content of the composition these were introduced: bitumen, lump, black oil and rubber mixture. As shown by experimental data, the content of black oil and rubber mixture has impact on the performance of the bituminous composition, that is seen from the graphs 3 and 4.
As it is seen from the constructed graphs, the best bitumen composition is as follows: bitumen - 73.5, lumps - 2.2, black oil - 22.1 and rubber mixture - 3.1%.
Thus, as a result of the conducted research, the action mechanism of saturated pol-
ymers on rubber from unsaturated rubbers containing EPTP, it was found that the main reason for their high heat resistance is the enrichment of the EPTP-60 from the surface layer during mechanical processing of the mixture. It was established that, while being introduced into the rubber mixture based on SKN-40, EPTP-60 and PVC, the heat resistance of vulcanizers is increased, with MGF-9 and PVC resulting in the compatibility having been improved in the system SKN-40-EPTP-60-P VC.
The addition of the obtained rubber mixtures to bituminous compositions made it possible to improve such parameters as penetration and extensibility.
Ö o
!
2 <D Ph
140
130
it
ö
u
x W
13
9
ö o •a
ë <D Ph
140
ö
<D
"K w
r-13 9 h3
10
15
<D
1 3
Ü <D
<K a o S S
50
--40
Fig.3. Dependence of bitumen composition qualities on black oil content: 1 - softening temperature, 2 - penetration; 3 -extensibility.
23,5
20 fueloil, %
Softening temperature
.. 60
50
--40
Fig.4. Dependence of the bitumen composition the qualities on the rubber mixture content: 1 - softening temperature, 2 - penetration, 3 - extensibility.
rubber stock, %
3
3
1
2
References
1. Kiselev V.P Use of products of joint processing of stone and brown coals, oil residues and polymer waste. News of high educational institutions. Building, 2008. P.17-22.
2. Sharipov V.I. and others. Obtaining binders for road construction from mixtures of brown coal, oil residues and polymer waste. Chemistry for Sustainable Development. 2005. P. 655-662.
SKN-40 УЭ SKEPT-60 COPOLIMERLORMN BiTUM BiRLa^MOLORlNO XASSOLORINO TOSiM
D.S.MammadHasan-zada
Apanlmi§ tadqiqatlarda SKN-40, copolimer SKEPT-60, polivinilxlorid va MQF-9 asasli rezin qan§igi hazirlanmi§dir. Naticada istilik muqavimati va yapi§ma xassalari artmi§dir. Alinmi§ rezin qan§iqlan bitum kompozisiyalarina alava olunmu§ va naticada penetrasiya va geni§lanma xassalari yax§ila§mi§dir.
Agar sozlar: rezin, bitum kompopozisiyasi, kauguk, rezin qari§igi.
ВЛИЯНИЕ СОПОЛИМЕРОВ СКН-40 И СКЭПТ-60 НА СВОЙСТВА БИТУМНЫХ КОМПОЗИЦИЙ
Д.С.МамедГасан-заде
В проведенных исследованиях были приготовлены резиновые смеси на основе бутадиен-нитрильного каучука СКН-40 (бутадиен-нитрильный каучук), сополимера СКЭПТ-60 (этилен-пропиленовый тройной сополимер), поливинилхлорида и МГФ-9 (олигоэфиракрилат). В результате увеличена теплостойкость и адгезия. Полученные резиновые смеси добавлялись к битумным композициям в результате чего улучшены такие показатели как пенетрация и растяжимость.
Ключевые слова: каучук, битумная композиция, глыбы, мазут, резиновый смесь.
3. Kotov S.V. Timofoeva G.V. Livanova S.V. Chemistry and Technology of Heat and Oils. 2003. P.52-53.
4. Mullahmedov N.R. Modification of road bitumen rubber. Bulletin of Kazan Technological University. 2010. P. 467-468.
5. Mukhanmaddinov I.I., Galimullin I.N. Oil refinery and oil-chemistry. 2017. N2. P. 33-37.
