RU1781243C - Rubber stock based on butadiene-nitrile rubber - Google Patents

Description

1

(21) 4760738/05 (22) 29.09 89 (46) 12/15/92. Bull. №46

(71) All-Union Research and Design Institute of the Rubber Industry

(72) R.S. Frenkel, A.D. Zalesska ./1. I. Strova, B.R. Mazaeva, L.M. Byddn, ina and N.A. Pominovash

(56) Frenkel R.Sh. et al. Rubber to general use in polar and nonpolar media, M., 1984, TsNIITEneftekhim, p. 7.

USSR copyright certificate No. 265436, cl. S 08/19/02.67

USSR copyright certificate No. 271798, cl. C 08 J 3/24, 67

USSR copyright certificate No. 421700, cl. C 08 L 9/02, 1972. (54) RUBBER MIXTURE BASED ON BUTADIENITRIL RUBBER

(57) Usage: rubber industry. SUMMARY OF THE INVENTION A rubber composition contains, by weight, by weight: butadiene nitrile rubber 100; oligoether acrylate 2-25; copper hydroxycarbonate CuCO3-Si (OH) 2 2-7; filler 30-120; organic peroxide 0.5-2.0; dithiodimorpholine 0.5-2.0. The mixture is prepared by stirring on a laboratory mill according to a conventional technique. Vulcanization is carried out in a standard press mode. Rubber characteristic: tensile strength 10-18.4 MPa, relates, elongation 270-610%, residual elongation 18-20%, abrasion resistance 170-250 cm3 / kWh, hardness according to TM-2 55 VZ elastic rebound 13 -52%, coefficient of thermal aging in air 100 ° C 72 h; by strength 0.89-1.0, relative elongation 0.76-0.85, coefficient of thermal aging in the medium SZHR-1 200 ° С, 48 h: by strength 0.6-0.68, according to the elongation is 0.31-0.38, the number of vulcanization cycles, after which it is necessary to repair the stainless steel mold to remove the corrosion layer for 20 cycles, the thermal aging coefficient in oil medium, 200 ° C, 48 hours: by strength 0 , 60-0.68, as regards, an elongation of 0.32-0.39 the same in water

PH7-10 0.66-0.71 medium at - relativity (strength)

sieve elongation of 0.3-0.35 / 0.3-0.36, the same in glycerol 180 ° C, 48 h, containing 15% hydrogen sulfide: strength 0.43-0.50, relative elongation 0, 40-0.55. 2 tab.

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The invention relates to the rubber industry, in particular to a rubber compound based on nitrile butadiene rubber.

To obtain heat-resistant rubbers from nitrile butadiene rubber, peroxides and compounds of the thiuram class are known to be vulcanizing agents. The vulcanizing group is very common in practice: tetramethylthiuram disulfide (thiuram) - 3 parts by weight, zinc oxide - May 5 parts per 100 parts by weight. rubber.

The resulting rubbers have reduced strength properties; resistance to thermal aging, especially in liquid media, although higher than sulfur, but lower than the required standards.

The best physical and mechanical properties, and especially the higher resistance to thermal aging in liquid,

Polar and non-polar media at 200 ° C and higher are characterized by rubbers containing copper sulfide, copper oxide.

Closest to the technical essence of the proposed rubber mixture is a rubber mixture including butadiene rubber - 100 parts by weight, oligoester acrylate - 10-30 parts by weight, copper sulfate - 3-7 parts by weight, filler - technical carbon - 45-70 parts by weight

However, rubber from a known mixture does not have sufficient resistance to liquid media containing hydrogen sulfide.

The second disadvantage of the rubber of the prototype is that it causes increased corrosion of the metal of the molds in which it is vulcanized. Special titanium coatings of molds must be used to reduce corrosion, which increases their cost.

The aim of the invention is to increase the resistance of rubber to liquid environments containing hydrogen sulfide and to reduce the corrosive effect of rubber on metal molds.

The goal is achieved in that the rubber mixture based on butadiene nitrile rubber, including oligoester acrylate, a copper compound and a filler, contains copper hydroxycarbonate of the formula CuCO3 Cu (OH) a as a copper compound, a mineral filler or carbon black as a filler, and additionally, organic peroxide and dithiodimorpholine with the following ratio of components, parts by weight: butadiene nitrile rubber100

Copper hydroxycarbonate of the formula CuCO3-Si (OH) 2 2-7 Oligoester acrylate 2-25

Filler 30-120

Organic Peroxide 0.5-2.0

Dithiodimorpholine 0.5-2.0

The mixture according to the invention uses nitrile butadiene rubbers according to GOST 7738-79, carbon black according to GOST 7885-77, white carbon black (mineral filler) according to GOST 18307-78, copper carbonate hydroxides - a mixture of copper carbon dioxide with copper hydroxide - CuCO3-Si (OH) 2 according to GOST 8927-79, D-35 compound or triethylene glycol dimethacrylate are used as oligoester acrylates, dicumyl peroxide or peroximon is used as organic peroxide. The mixture also contains dithiodimorpholine and may contain other targeted additives, for example plasticizers (dibutyl sebacinate).

Mixtures are prepared on conventional laboratory rollers according to the generally accepted method, and vulcanization is carried out in the press. Tests of vulcanizate samples are carried out in accordance with existing standards.

The invention is illustrated by the examples presented in table 1. Physico-mechanical properties of rubber from mixtures are presented in table.2.

Claims (1)

SUMMARY OF THE INVENTION A rubber mixture based on nitrile butadiene rubber comprising oligoester acrylate, a copper compound and a filler, characterized in that, in order to increase the resistance of rubber to liquid media containing hydrogen sulfide, and to reduce the corrosive effect on the metal of the mold, as a compound the mixture contains copper hydroxycarbonate of the formula CuCOj Cu (OH) 2, as a filler - a mineral filler or carbon black and optionally - organic peroxide and dithiodimorpholine in the following ratio Components, parts by weight .: Nitrile rubber 100 Hydroxycarbonate copper of the specified formula 2-7 Oligoether acrylate 2-25 Mineral filler or carbon black 30-120 Organic Peroxide 0.5-2.0 Dithiodimorpholine 0.5-2.0 The main components: Nitrile butadiene rubber SKN-26100100100100 ------- The same SKN-18 ------- YuO100100-100 The same SKN-40-100-100100-100100 Thiuram-3 - Copper sulfide or copper sulfate 5 g - --- 2 - Copper hydroxycarbonate --- 535722 --- 2 Compound d-35-25-25-25 ------ Copper hydroxide Carbon dioxide copper Mineral filler, soot white45 5-5 -------- Carbon filler PM-70--70-30700120 -7070120 120 Carbon black PM-40 ..-. 50 ---- 50 Note. Mixtures 1-3, 10 known mixtures 4-0 according to the invention, mixtures 11-13 control. Mix Formulation 01 -4 00 go X OJ table 2 Physico-mechanical properties of rubber a) by strength 0.66 0.43 0.6V U, 6h 0.7 0.7 0.69 0.68 0.71 0.65 0.112 0.46 0.6 O5 TTL 1G $ 7 TiTSR 777 O TG77 M7 TfTtiT T | t7 TSTG MO 7; G O) relative  Јf No. And- “# - W- No. No. WS- hell Ј $ The same is true for glycerol (, iB h) containing 151 sulfur compounds a) by strength 0.33 0.25 0.37 0, i J 0, (3 0.1 (9 0.1) 5 0.1 (7 0.50 0.02.22 0.21 0.26 G) relative elongation 0.37 0.25 0.38 0.4 | 0, s1 0, b0 0, i8 0.55 0, b0.19 0.2) 0.2 Note. The rubber composition is b, but the content of the hydroxycarbonate instead of the unequal molecular weight of the amount of copper hydroxide or copper carbonate, taken separately, is vulcanized 8 three times slower: the optimum vulcanization at 160 C instead of 40 min, respectively 110 and 120 min