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DOI: http://dx.doi.org/10.20534/ESR-17-5.6-93-95
Americans Fariz Ali,
Azerbaydzhansky State University of Oil and Industry of the department chair "Orgonicheskiye of substances and technology high-molecular connection",
d. m.H, professor Movlayev Ibrahim Gumbat, associate professor "Organic substances and Vms.Azerbaydzhansky
State University of Oil and Industry Ibragimova of Sim Mamed, starshy teacher of chair" Organic substances and technology of Naval Forces" Shykhaliyev Ker Seyfi-professor of chair "Organic substances and technology of Naval Forces"
Azerbaydzhansky State University of Oil and Industry
Shykhaliyev Kerem Seyfi, Professor of the department "Organic matters and technology of the Navy" Azerbaijan State University of Oil and Industry Kazyeva Gyultakin Rasim, Doktarant of chair "Organic substances and Naval Forces" Azerbaydzhansky State University of Oil and Industry E-mail: kerem-shixaliyev@mail.ru
MODIFICATION OF RUBBER MIXTURE BASED ON BUTADIENE -NITRILE RUBBER CKN-40 M BY MODIFIED THIOURED PHENOL-FORMALDEHYDE OLIGOMER
Abstract: Rubber mixtures based on butadiene-nitrile rubber CKN-40M and polyvinylchloride (PVC) containing modified thiourea phenol-formaldehyde oligomer (TPFO) as modifying additive have been developed and complex properties of their vulcanizates have been investigated.
It has been determined that obtained rubbers keeping indices of physico-mechanical and exploitational properties at standard level have significantly improved stability indices of adjacement of rubber to metal, petrol resistance, and stability to tension.
Keywords: rubber mixture, butadiene-nitril rubber, polyvinylchloride, modified thioured phenol-formaldehyde oligomer, modification, compatibility.
At modern stage in creating of the most important types composition materials and items the problem of the increase of their quality and service life has a great significance. Solving of this problem is equal to additional manufacturing of the product without expanding volume of production and provides a significant economy of raw materials resources.
Rubber of various designated purposes is related to widely spread composition material.
Modern rubber industry produces various items to which different requirements are presented depending on the use of the items and conditions of their exploitation. It brings to necessity of the development and research ofvarious rubber receipts distinguished on technological and exploitation properties.
At present reserves of rubber assortment have been exhausted. That's why tendency in the production of rubber-technical items doesn't only consist of synthesis of new rubbers, but the search of rational ways of the use of industrial big weight rubbers. It is achieved by combining various elastomers and their modification in the con-
ditions of traditional processing with additives containing functional groups.
It is known -that chlorine containing polymers find wide use for producing of composition materials having chemical and thermal stability, adheous durability to various substates.
Rubber mixture is used for production of oil field equipment packers of oil extracting industry and other rubber technical items based on butadiene-nitrile rubber CKN-40M, triple ethylene-propylene rubber (SREPT-60) and polyvinylchloride (PVC) CKN-40M-SREPT-60+PVC=70+20+10 [1].
Disadvantage of this known rubber mixture is the low indices of durability in tension, petrol resistance and attachment of rubber to metal.
It is connected with that the initial hardness of polyvinylchloride (PVC) doesn't allow to achieve high level of dispersing and interaction between system phases, as a result compatibility in interphase zone worsens and indices of physico-mechanical properties of compositions containing PVC reduce [2].
Section 10. Chemistry
That's why at present researches on the development of new compositions are carried out to improve physico-mechanical and exploitation properties of rubber mixture based on butadiene-nitrile rubber.
One of the ways ofregulating technological properties ofrubber mixtures is introduction into their composition of small quantities of special ingredients-technological additives which promote to improvement and stabilization of technological properties of rubber mixtures not influencing negatively on main complex of physico-mechanical properties of rubber.
Modificators-various reaction capable, functional group containing oligomers have been used for improvement of physico-me-chanical properties ofvulcanizates of rubber mixtures.
In accordance with it we have developed rubber mixture on the basis of butadiene-nitril rubber CKH-40M and polyvinylchloride (PVC) contaening modified theoured phenol-formaldehyde oligomer (TPFO), amine as a modifying additive with and hydroxyl groups in matrix (molecular mass-764, density-1290 kg/m 3, viscosity on VZ-1-54 sec.) [3]. Distinguishing technological properties of this class combinations and presence of functional groups, good compatibility with rubbers and fillers, good rheological characteristics condition their successful application for modification of rubber mixtures were prepared on laboratory shafts at 25-300 ° C.
Total durability of combining of components was 20-25 minutes. Vulcanization of rubber mixtures was carred out at 1500 C temperature within 15 minutes. Elastic-durable properties of vulcani-zates were determined on GOST 270-75, durability to thermal aging on GOST 9.024-74, petrol resistance on GOST 9030-74, stability
Table 1. - Composition of rubber mixtures
of adjacement of the rubber to metalon GOST 209-75.
Contents of rubber mixtures have been presented in table 1, and physico-mechanical indices of vulcanizates have been given in table 2.
Components contents, mass.p
Components known developed
1 2 3 4
CKH-40 M 70 90 90 90
PVC 10 10 10 10
SREPT-6 20 - -
Modified thiourea of phenol-formaldehyde oligomer (TPFO) - 2,5 5,0 7,5
DUEK-4 (bis-dehydrocycle opentadienyl capromat) 6 6 6 6
Sulfur 2 2 2 2
Kaptax 1 1 1 1
Altax 1 1 1 1
ZnO 4 4 4 4
Neozon 2 2 2 2
Technical stearine 1 1 1 1
Kanifol 2 2 2 2
Technical hydrocarbon P-803 20 20 20 20
P-234 50 50 50 50
Note: 1 - components have been taken in mass.p on 100 mas/h of the mixture CKH-40M+PVC+SREPT-60PV2,3, 4 - components have been taken in mass/units on 100 mass.p of the mixture CKH-40M+PVC
Table 2. - Physico-mechanical indices of rubber mixtures vulcanizates
Indices
№ Name of the indices known developed
1 2 3 4
1 2 3 4 5 6
1 Conditional stability in tension 16,6 18,1 18,9 18,8
2 Retative extension,% 335 360 380 375
1 2 3 4 5 6
3 Relative residual deformation% 12 12 12,2 12,5
4 Abrasion, sm 3/kvt-h 68 68,3 69,6 69,2
5 Resistance to tear kH/m 56 60 59 58,5
6 Stability of attachment of rubber to metal, MPa 5.5 3.6 8 5,1 9,2 6,2 9.8 6.9
7 Temperature of fragility 245 247 248 249
8 Hardness on TM cond.unit 78 82 82,1 81,6
9 Swelling degree at 296 K temperature within 24 hours in mixture of isooctane-toluene in the mixture of gasoline benzol (3;1) 14,5 23,5 10,1 14,7 10,2 14,1 10,6 13,9
10 Coefficients of heat aging at 379 K wilhin 48 hours: On durability On the relative extension 1,03 0,88 0,92 0,83 0,94 0,86 0,95 0,90
11 Elasticity on rebound 14 13,7 14 13,9
12 Stability to ozone at 298 K temperature, within 27 hours (deformation 20%, ozone concentration 0,015%) Does not destroy Does not destroy Does not destroy Does not destroy
Comparison of physico-mechanical and explotation properties ofvulcanzates of the developed rubber mixture has been carried out.
As it is seen from the data presented in table 2 indices of stability of adjacement of rubber to metal, petrol resistance, and stability to tension are improved when using developed rubber mixture based on butadiene-nitrile rubber CKH-40 M and polyvinylchloride (PVC) as modifier of the modified thiourea phenol-formaldehyde oligomer (TPFO) containing amine and hydroxyl groups, keeping indices of physico-mechanical and exploitation properties of vulcanizates of the obtained rubber.
Improvement of indices ofphysico-mechnical and exploitation properties of rubber mixture vulcanizates obtained on the basis of developed receipts is explained as a result of interaction of modified thiourea phenolformaldehyde oligomer (TPFO) containing amine and hydroxyl groups with polymers of the mixture of bu-tadiene-nitrile rubber CKH-4 M and polyvinylchloride (PVC) in CKH-40M+PVC system.
References:
1. Ibrahimov A. D., Bilalov Y. M., Movlayev I. G. and et al. Research of properties of oil-petrol resistant rubbers on the basis of CKH-40M, SREPT-60, nairit, PVC for oil machine-building equipment. Scientific notes ofASOA - No. 2, - 1995, - P. 127-135.
2. Movlayev I. G., Bilalov Y. M., Ibrahimov A. D. and et al. Properties of vulcanizates based on SREPT-60 PVC composition. Cauchuk and Rubber, - 1982, - No. 4, - P. 14-15.
3. AR patent i20090137, 20.07.2009 Vulcanizated rubber mixture. Agakishiyeva M. A., Bilalov Y. M., Movlayev I. H., Ibrahimova S. M., Amirov F.A.
