SU583143A1 - Rubber mixture - Google Patents

Description

The invention relates to the rubber industry, in particular to the development of a rubber mixture based on non-precious rubber. A known rubber mixture based on unsaturated rubbers, comprising sulfur and a sulfur-containing accelerator, for example, the class of tiazals or sulfenamides 1. However, the rubber from such a mixture is characterized by poor heat aging resistance. In the case of using as a: a sulfur-containing accelerator in a known mixture of thiuram l, heat-resistant rubber is obtained, but with low efficiency. The purpose of the invention is to increase the resistance to thermal aging of rubber. The goal is achieved by using 1,2-dithiacyclopentene of the general formula (RR) / S C-i as accelerator where I is methyl, phenyl, - SCHj or - SC; jHj with the ratio of components (in weight parts); Rubber 100 Sulfur 0.1-3 Vulcanization accelerator of formula IO, 5-4 Example. Prepare rubber mixtures according to the recipes listed in Table. 1-3. In tab. 1 shows the conditions for the preparation of rubbers (vulcanizates) and their properties, the accelerator in which formula I is used with the following value 1 K -CH, W 2R - J 3 s; (4 p., H5. Rubber indicators based on natural rubber smoked-sheets are investigated. Recipe (in weight parts): rubber 100, zinc oxide 6.5, the amount of sulfur is shown in the table. Rubber indicators based on butadiene rubber (SKD) Composition mixtures (parts by weight): IQO rubber, -sera 2, stearin 2, zinc oxide 5, rubrax 5, carbon black PM 70-50, accelerator, see table 21. Rubber values on the basis of mutated rubber SKN-18) Composition)

mixtures (in weight, parts): rubber 100, sterin 1.5, zinc oxide 5, vulcanized and a group- see table. 3), technical y-lock DG-100-501.

From tab. 1 shows the advantage of the proposed rubber mixture over the well-known {with captax) - greater temperature resistance and better aging resistance. Similar conclusions follow from Table 2, where a mixture with a santochure is taken as a prototype. It is known, however, that the best heat resistance

have mixtures containing thiuram. Therefore, in table. 3 shows the comparative data of rubber containing thiuram. In this case, the advantages of the proposed rubber mixture are also visible: increased heat resistance and a better dynamic rubber drainage from it.

Thus, in terms of the combination of properties, the proposed accelerator provides rubber of better quality compared to the quality of rubber with known accelerators.

Table 1.

133

133

20

20

300

300 220 200 h

160

150

800

800 850 950

65

. 68 72 75

50 45 0.95

133

133

133

20

20

20

300

300 270 270

200

200

180

700

700 800 800

75

75 82

75 82

81

50

50

50

0.95

0.95

0.95

0.95

Tear resistance, kgf / cm

at 20 ° C

at

after aging

at 100s x 72

Relative extension, %;

at 20C

at 100 ° C

after aging

with YOS x72

Residual length

Rar resistance: kgf / cm

at 20 ° C

at 100 ° C

after aging

100 ° C 72 hours

Tear resistance, kgf / cm

Relative lengthening, Residual lengthening,% Elasticity on rebound,

Tear resistance, kgf / cm

TM-2 hardness

The coefficient of temperature resistance at 100 ° C:

by strength

by relative

lengthening

Heat aging resistance coefficient (UOS x72 h):

by strength

by relative

lengthening

Table

180 110

120

500

300

250

ten

40 30

30 3

Table

250

460

eight

42

55 72

0.45 0.6

0.73 0.5

Claims (1)

Indicator Frost resistance at creep overgrowth, thousand cycles Residual deformation after compression by 30%, 72 h,% Claim of the invention resistance to heat aging of rubber from this mixture, the latter contains the qualities of sulfur-containing vulcanization accelerator 1,2-dithiacyclopentene of the formula RK Continued table. 3 Vulcanizing group, parts by weight accelerator 4 3 sulfur 0.2 0.2 400 where B is methyl, phenyl, - SCHj or SCgHs i and the components are taken in the following ratio (in parts by weight}: Unsaturated rubber 10Q Sulfur, 1-3 Vulcanization accelerator of the specified Formula O , 5-4 Sources of information, accepted military expertise during examination: 1. Handbook of rubber man, M., mi, 1971, pp.277-310.