SU899588A1 - Vulcanizing rubber stock - Google Patents

Description

(S) VOLKANIZABLE RUBBER MIXTURE

one

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

A known rubber mixture comprising a semi-active furnace black soot with a specific surface 5057, containing sorbed polycyclic aromatic hydrocarbons 1 on its surface.

However, this rubber mixture does not provide sufficiently high strength properties of vulcanizates and technological properties of the rubber mixture.

Closest to the invention is an antistatic vulcanizable rubber compound based on synthetic rubber containing kiln carbon black as a filler with a content of 0.3-3 wt.% Polycyclic aromatic hydrocarbons I.

However, vulcanizates from a known mixture are also characterized by low strength properties.

The purpose of the invention is to improve the technological properties of the rubber mixture and increase the strength properties of vulcanizates.

 This goal is achieved by the fact that a vulcanizable rubber mixture based on unsaturated rubber, including a filler — black carbon black with a specific surface area of 50–57, containing polycyclic aromatic hydrocarbons, contains as a filler furnace black soot with a content of 0.21-0.23 wt.% polycyclic aromatic hydrocarbons with a ratio of rubber and

15 soot (weight, h) 100: (30-80).

Example 1. Rubber mixtures of the following composition are prepared on laboratory rolls, parts by weight: butadiene-C-methyl styrene rubber

20 SKYS-30 ARKM-15 100; stearic acid 1, zinc oxide 3; santokur 1, sulfur 1.75 and carbon black PM-50 50, having a different content of sorbed polycyclic aromatic hydrocarbons (0.21-0.23% by weight of soot). From the resulting mixtures, volcanoes are sampled for 50 and 80 minutes at and tested.

Example 2 (Comparative.). Carried out analogously to example 1, but carbon black is used with a content on the number of polycyclic hydrocarbons, 0.00 0.21 weight. % Area of visible soot agglomerates, µm 323 291 Content of soot-rubber 3 45 kg gel,% Stress at extension, kgf / cm 121 131

Strength at break kgf / cm

213 227 225 229 203 Relative elongation h QJ 603 593 ni ,, - 6

Residual elongation

18 20

%

Tear resistance,

kgf / cm 43 49

its surface is 0,, 0 of the weight of soot of polycyclic aromatic hydrocarbons (according to 16-hour extraction with benzene). Physico-mechanical properties of black-filled rubber mixtures and their vulcanizates are given in the table.

3.0

3 "9

180

621

21

21 21

nineteen

52 42 40

51 0.22 0.23 0.3 287. 293 334 45 40 129 133 P6 589 590 618

Physicomechanical

Dynamic module kgf / cm

15 13

Internal friction module, kgf / cm

21 18 Fatigue endurance, thousand cycles 3.13; 27

Growth resistance

f

cracks, thous. cycles

 359 Note. vulcanization during vulcanization. As can be seen from the table, rubber mixtures and their vulcanizates, filled with carbon black, which contain on their surface polycyclic aromatic hydrocarbons 0.21 - 0.23% by weight of soot (examples 2-4) differ from the control and known mixtures (examples 1.5 and 6) of a smaller area of undispersed carbon black agglomerates and a high content of carbon black gel. . 6, according to the magnitude and nature of the changes in the dispersity and gel content, the physicomechanical properties of vulcanizates and rubber compounds change. Changes in all physicomechanical properties of mixtures and vulcanizates are insignificant in the range of values of the content of polycyclic hydrocarbons 0.21-0.23 wt.%. As we approach a known composition, it is similar to the nature of changes in dispersion and the geoproduct content of the table.

Soot samples

21

20 17

12

16 23

17

2C

Claims (2)

367373 312 301 3.3 3.30 2.97 2.83 kfc over 50. min; within 80 min. l, their changes become significant. are solid. Thus, if the fatigue endurance index practically does not vary within the range of the content of polycyclic hydrocarbons of 0.210, 23 wt.%, Then with the content of 0.3 weight. its change reaches 8. The invention provides improved technological properties of the rubber mixture and the physicomechanical properties of vulcanizates from it. Vulcanizable rubber compound based on unsaturated rubber, including filler - furnace black with a specific surface 50-57, containing polycyclic aromatic hydrocarbons, characterized in that, in order to improve the technological properties of rubber 7995888 A new mixture and increase the strength- Sources of information properties of vulcanizates from it, taken into account in the examination, it contains as filler furnace soot with a content of 0.21-1. Taubman AB, Tolsta S.N., 0.23% by weight of polycyclic aroma-5 colloid journal. 196 / № 26. p.356. hydrocarbons at relative 2. USSR author's certificate Senei rubber and soot (wt.h) 100: № 562998, class. C L L 9/00, 1975 (30-80). (Prototype).  - - f h, -; .l "-, .i .. - -; .., - -M.