Rubber mix

FIELD: rubber industry; production of rubber mixes used for manufacture of collar seals for oil equipment.

SUBSTANCE: proposed rubber mix contains the following constituents, mass-% (per 100 parts by mass of rubber): butadiene-nitrile rubber Grade БНКС-40AM and БНКС-40AMH, 80.0; hydrogenated butadiene-nitrile rubber Grade БНКВ, 40-30; Terban, 20.0; sulfur, 3.5; sulfenamide M, 0.50; altax, 0.50; stearic acid, 1.00; colophony, 2.0; dibutoxyethyl adipate, 11.0; white carbon, 5.0; zinc white, 4.0; diafen, 2.0; commercial carbon П-803, 20.0; commercial carbon П-245; modifying agent РУ-Д, 2.0; aramide or polyamide fibers, 10.00.

EFFECT: enhanced tear resistance of vulcanizing agents; increased service life of collar seal; possibility of using collar seals at low temperatures.

3 tbl

 

The invention relates to rubber industry, in particular, to the manufacture of rubber compounds used for the manufacture of radial shaft seals for oil equipment.

Known rubber mixtures based on different rubbers (A.S. 1073254, publ. 15.02.84), containing in its composition powdered polymer fiber. For example, a rubber mixture based on the combination of chain rubbers, including serosorting vulcanizing group, softening agent, stabilizer, modifier additive and carbon black with a degree of coalescence of particles in the unit 0,03-0,09. The mixture also contains a polymeric fiber length 5-9 mm in the following ratio of components, parts by weight: chain rubber - 100; serosorting vulcanizing group - 6,5-13,0; stabilizer 1,0-3,0; softening agent 14-20; modifying additive - 14-20; carbon black with a degree of coalescence of particles in the unit 0,03-0,09 - 50-70; polymeric fiber - 3-20.

Known (A.S. 1008215, publ. 30.03.83) rubber compound based on unsaturated rubbers, including a 1.5 to 15.0 parts by weight per 100 parts by weight of rubber, fiber, modified in a 1:1 ratio of low molecular weight butadiene-nitrile rubber with the content of Acrylonitrile units 10-18% and carboxyl groups of 2.5-3.5% and molecular weight of 2000-10000.

Known rubber based on butadiene-nitrile rubber (SCN), vkljuchajuwih the fillers, the vulcanization activators, vulcanization accelerators, softeners, dispersing agents and sulfur (possibly the introduction of other special additives) /Fedyukin DL, Majlis FA Technical and technological properties of rubbers. M.: Chemistry, 1985. s/.

Also known (patent RF 2232171, publ. 10.07.2004) rubber mixture based on butadiene-nitrile rubber, which contains in parts by weight (per 100 parts by weight of rubber): rubber butadiene-nitrile brand BNX-AM, AMS - 100,00; thiuram D - 1.5; NN'decimalpoint - 2,00; sulfenamid C - 2.00; naphthas 2 - 1,5; deafen OP - 1,00; zinc white - 5,00; rosin - 5,00; chalk of MOR, MMS-1 - 30,00; carbon black P-701 - 55,00; carbon black P-514 - 20,00; dibutyl - 15,00.

The closest (A.S. 966097, publ. 15.10.82, prototype) to offer the rubber mixture to the technical essence and the achieved technical result is a rubber mixture based on butadiene-nitrile rubber, including peroxide and three(oksietilenom)-£,ω-dimethacrylate. The mixture contains metaphenylenediamine and polyvinyl alcohol fiber with a fiber length of 4-10 mm in the following ratio of components, parts by weight of: rubber - 100; three(oksietilenom)- £,ω-dimethacrylate (oligopyrroles TMG-3) - 5-20; metaphenylenediamine (MFDM) - 0,50-10,0; polyvinyl alcohol fiber - 20-50; peroxide - 2-3.

The disadvantage of these rubber compounds is the low tensile strength tear and increased the tempo is the atur fragility, do not allow the use of the rubber mixture in a wide range of temperatures in oil environments and synthetic oils containing abrasive particles.

The technical result of the invention is to eliminate these drawbacks and increase the resistance of the vulcanizates tear, increasing the efficiency lip seals and the possibility of operating at lower temperatures.

The technical result is achieved by the fact that the rubber mixture contains in parts by weight (per 100 parts by weight of rubber): rubber butadiene-nitrile brand BNKS-40 AM, BNX AMS - 80,00 (TU 38.30313-98); rubber butadiene-nitrile hydrogenated brand BNCW 4030 (TU 40307-89), grade Turban 3446 (Prospect by Bayer AG, Germany) - 20,00; sulfur (GOST 127.4-93) - 3,50; N-oxydiethylene-2-benzothiazolylsulfenamide-sulfenamid M (TU 6-14-756-78) - 0,50; Thiazole 2 MBS-altax (GOST 7087-75) - 0,50; stearic acid (GOST 6484-96) - 1,00; rosin (GOST 19113-84) - 2,00; deburocratisation (TU 2493-127-55778270-2002) - 11,00; white carbon (GOST 18307-78) - 5,00; zinc white (GOST 202-84) - 4,00; N-isopropyl-N'-phenylenediamine-1.4-deafen OP (TU 2492-002-05761637-99) - 2,00; carbon black P-803 (GOST 7885-86) - 20,00; carbon black P-245 (GOST 7885-86) - 50,00; modifier ROO-D (TU 2494-011-00149452-99) - 2,00; aramid (TU 8378-041-05138230-2006) or polyamide (GOST 24221-94) fiber - 10,00.

Declare a set of essential features showing new the properties, to obtain a change in the quantitative outcome measures, namely: improving the tear resistance and resource efficiency in a wider range of temperatures compared to known compounds.

The novelty of the proposed solution is a new combination of known components used in various rubber compounds, and their different proportions.

The production of the rubber mixtures according to the invention is carried out in two-step mode in the rubber mixer 4.5 litres. Modes and boot sequence components are presented in tables 1 and 2.

Table 1
The production of rubber mixtures stage 1
NNThe sequence of operationsTime min
1Download: rubber, stearic acid, zinc oxide, rosin, deafen AF, white carbon, carbon black P-8030
2Download: deburocratisation, carbon black P-245,2
3Type: aramid or nylon fiber4
4To unload the rubber mixture7
Ȋ The temperature of the rubber mixer22±5°
The temperature of the rubber mixture during unloading90±5°
The number of revolutions of the rotor30 rpm

After the rubber mixer a mixture of 1-stage process for 2-3 minutes on rollers. After a rest the mixture for two hours made the 2nd stage.

Table 2
The production of rubber mixtures stage 2
NNThe sequence of operationsTime min
1To download Royal mixture of 1-St stage0
2Download: sulfur, sulfenamid M, altax, modifier RU-D2
3To unload the rubber mixture3
The temperature of the rubber mixer22±5°
The temperature of the mixture at discharge70±5°
The number of revolutions of the rotor30 rpm

Properties of the proposed rubber mixture in comparison with the prototype presented in table 3.

Table 3
Properties of rubber compounds by known and proposed structures
Name of indicatorRubber

the mix

prototype
Rubber compound
according to the invention
With aramid fiberWith polyamide

fiber
1. Conditional tensile strength, MPa13-321922
2. Elongation, %30-405040
3. Shore a hardness, cu89-979293
4. Tear resistance, kN/m61-112155131
5. Low temperature brittleness, °-20-40-40
6. The coefficient of friction, P=1.5 kg/cm2V=1.0 mm/min0,63-0,380,300,34
7. Resource efficiency, km (working pressure of 5.0 MPa working medium : oil AMG-10, a helical movement, the circumferential speed of 0.08 m/min, the friction path for the cycle 1.7 m, the roughness on the surface of the counterface Ra=2.5 ám, t=25°C)310650510

Analysis of the data in table 3 shows that the proposed according to the invention the rubber mixture has a significantly better performance on measures: tear resistance, embrittlement temperature and resource availability.

Proposed according to the invention the rubber mixture can be successfully used in lip seals for oil equipment in a wide temperature range.

The rubber mixture based on butadiene-nitrile rubber, including stearic acid, zinc white, carbon black, fiber, characterized in that as nitrile butadiene rubber it contains butadiene-nitrile rubber stamps BNKS-40 AM, BNKS-40 AMS and butadiene-nitrile hydrogenated rubber stamps BNCW 4030, grade Turban, as a carbon black - carbon black mark P-803 and brand P-245, as fiber - aramid or nylon fiber, and also contains sulfur, sulfenamid M, altax, rosin, deburocratisation, white carbon, deafen modifier FP and PN-D in the following ratio of components, parts by weight:

hydrogenated brand BNCW 4030, Turban
rubber nitrile butadiene brand
BNKS-40 AM, BNKS-40 AMN80,0
rubber nitrile butadiene
20,0
sulfur3,5
sulfenamid M0,5
alltex0,5
stearic acid1,0
rosin2,0
deburocratisation11,0
white black5,0
zinc white4,0
deafen AF2,0
carbon black P-80320,0
carbon black P-24550,0
modifier RU-D2,0
aramid and polyamide fiber10,0



 

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4 tbl

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