SU804660A1 - Unsaturated rubber-based vulcanized rubber mixture - Google Patents

Description

one

The invention relates to the rubber industry, in particular to the development of a vulcanizable rubber compound based on unsaturated rubbers.

A vulcanizable rubber mixture 1 based on unsaturated rubbers is known, which includes target additives and filler - modified carbon black treated with organic compounds from the thiourea group, alkylated phenols, fatty alcohols, fatty acids, etc. with the following content of components, parts: not saturated rubbers 100

Soot 50

Target supplements20

However, rubbers from this mix have lower wear resistance, as well as tear resistance and heat resistance.

The purpose of the invention is to increase the wear resistance as well as the resistance to tearing and heat resistance of rubber from this mixture.

This goal is achieved by the fact that vulcanizable rubber mixture based on unsaturated rubbers, including target additives and filler - modified carbon black, as the latter mixture contains

active carbon black modified from 0.5 to 3% by weight of carbon black with an organic compound selected from the group: urea, maleic anhydride, ethoxylated fatty acid alkylolamide of the formula

R-CONH-R O (CHj-CH,

the product of the interaction of the latter with the urea formula

K-SONN-I O {CH2-SNG-O) (HNg), 7-O,

where R is the hydrocarbon residue of the acid with 10 to 16 carbon atoms; R is a hydrocarbon radical with 1-4

carbon atoms; m is the number of carbon atoms, nitrogen and oxygen in the main chain of fatty acid alkylolamide, n 1-7 at the following ratio of components, parts by weight:

Unsaturated rubbers 100 Specified modified soot 40-70 Target additives 10-35 Example 1. In a laboratory rubber mixer with a load of 1900 g

Butadiene-methylstyrene rubber SKMS-ZOARKM-27 prepares a vulcanizable rubber mixture following its composition, weight, including: rubber 100; stearin 2; zinc oxide 5; altax 2; sulfur 2 and PM-100 carbon black containing 1% urea 40. At the same time, a control mixture of the same composition is prepared with carbon PM-100 modified with 1% of synthetic fatty acids (FFA) fraction C. Modification of carbon black for the control mixture (by a known method) is carried out by dispersing the dust of carbon black in a 0.1% aqueous solution of synthetic fatty acid sodium soap of FFA with the preparation of a 10% dispersion of carbon black, titrating it with a 1% hydrochloric acid solution.

ACIDS with stirring until neutral (pH of the aqueous dispersion is 7-8) g are filtered soot from the aqueous phase, washed with a 10-fold amount of water and dried to a moisture content of not more than 0.5%. In parallel, a second control mixture of the same composition is prepared with PM-100 soot modified with 1% butyl alcohol by mixing dusty soot with a 1% aqueous solution of alcohol in a 1: 1 ratio, followed by drying the wet granules. The test and control mixtures are vulcanized in a hydraulic press with steam heating for 60 minutes.

The properties of the obtained vulcanizates are given in table.1.

Table 1

Stress at 300% elongation, kgf / cm Tear resistance, kGS / cm 242 i 238 Dynamic carrying out 7131 6780 face, thous. Cycle. Abrasion resistance, cm / kWh 145 159 Heat aging coefficients (72 hours at 100 ° C) for resistance

Example 2. A vulcanizable rubber mixture was prepared analogously to Example 1, but using a modified PM-100 carbon black containing 1% maleic anhydride.

The properties of the vulcanizate of the mixture obtained are given in table.1.

Example 3. In a laboratory rubber mixer with a loading of 1900 g of rubber, a vulcanizable rubber mixture of the following composition is prepared, i.e., isoprene rubber (SKI-3) 2i; cis-polchbutadiene (ACS) 40; bu1 Lien-methylstyrene rubber 1GKMS-ZOLRKM-27) 40; oleic KHC.ior.i 2; rosin 1; spetsbigum 2; Mii-chl ((1 15; zinc oxide 5;

sulfenamide W 0.8; antioxidant 4010NA 1; AV / 1 Santoflex; sulfur 1.6 and active furnace Sa-PM-100 modified with 1% ethoxylated alkylolamide synthetic fatty acids (technical name Sintamide 5) 65. Mixtures of the same composition with modified carbon black containing 0.3% are also prepared; 0.5%; 3% and 4% syntamide 5. At the same time, a control mixture of the same composition with modified carbon black containing 1% FFA is prepared. The curing of the test and control mixtures was carried out in a press at 153 ° C for 20 minutes.

The properties of rubber mixtures and vulcanizates are given in table 2.

60 64 65

16 20 19

90 91 92

203 229 238

520 620 600

73 50 43

150 123 116

Dynamic displays

128. 473 594 cycles.

Test after

aging

. (X 72 h):

Resistance d

rupture, kgf / cm

Relative

elongation,%

EXAMPLE 4 Vulcanized rubber mixtures are prepared as described in Example 3, but using a modified PM-100 carbon black containing various amounts (from 0.3 to 4% by weight) of the product of hydroxyethyl interaction. Mooney viscosity MB-1-4 -100, used

Time of the beginning of the volcanic ejection according to Mooney, min

table 2

65 66 62

60

19 18 18

15

92

93 88

86

236,225,208

212

580 560 540

520

438 42 Oiled. 71 96 93 - 158

498

566

424

183,171

145

382 375

278

alkylamide synthetic fatty acids with urea (technical name siptak).

 The properties of rubber mixtures and vulcanizates are given in tab. 3

Table 3.

60

63

64 64

63

15

17

18 17

18

Indicators

Experienced mixtures containing syptak

0.3 I 0.5 l, o 2, o1 3, o 4, Voltage at 300% udane, kgf / cm 88 89 Tear resistance, kgs / cm 229 234 Relative elongation 600 590 ni%, Test for MIR-1, , VKBT-4 cm. Coefficient of slippage. Endurance during repeated stretching, thousand cycles. Test after 72 hours of aging with Gap resistance. Continuation of table. 3

Control of soot, weight.h. the mixture with 1% FFA

O 90 92 226 224 580 570 113 106 121 113 562 486

Claims (1)

SUMMARY OF THE INVENTION Vulcanizable rubber. A mixture based on unsaturated rubbers, including target additives and filler modified carbon black, characterized in that, in order to increase the wear resistance and tear resistance and heat resistance of rubbers and this mixture, the latter contains active carbon black as a filler, modified 55% 0.5-3% by weight of carbon black with an organic compound selected from the group: urea, maleic anhydride, ethoxylated fatty acid alkylolamide of the formula ¢ 0 R-CO NH -? CO (CH ₂ - CH ₂ -О) _M Н is the product of the interaction of the latter with urea of the formula [c-СОМН -R _A O (CH _a “CH ₂ -ov] [cO (NH ₂ ) ₂ 0, 6h), where R is the hydrocarbon residue of a fatty acid with 10-16 carbon atoms; R ^ is a hydrocarbon radical with 1-4 carbon atoms; m is the number of carbon, nitrogen and oxygen atoms in the main chain of fatty acid alkylolamide, η = 1-7 in the following ratio of components, wt.a .: Unsaturated rubbers Specified Modified Soot Target Additives