SU1134578A1 - Rubber stock based on isoprene rubber - Google Patents

Abstract

RUBBER MIXTURE BASED ON ISOPRENE RUBBER, including low molecular weight butadiene rubber with nitrosodiphenylamine groups, sulfur, dibenzthiazolyl disulfide, diphenylguanidine, stearic acid. Zinc oxide, carbon black, characterized in that, in order to increase the cohesive strength of the rubber mixture and its stickiness, it additionally contains 2,3,5,6 tetraftorgom terephthalic acid in the following ratio of components, May.4 .: Isoprene rubber 100 Low molecular weight butadiene rubber with nitrosodiphenylamine groups1-2 2,3,5,6-Tetraftorgomoterephthalic acid 0.1-0.5 § Sulfur 0.5-1.5 Dibenzthiazolyl disulfide (L feed 0.4-0.8 Diphenylguanidine 1.0-3, 0 Stearic acid 1.0-2.0 § Zinc oxide 2.0-5.0 Technical carbon 20-80

Description

The invention relates to the rubber industry, specifically to rubber compound compositions used for the manufacture of rubber products. At present, synthetic polyisoprene rubber (SKI-3) is used in most cases instead of natural rubber. Rubber mixtures based on SKI-3 are inferior to mixtures based on natural rubber for cohesive strength, they are relatively quickly degraded on rollers and others. In order to eliminate these disadvantages, oligoether acrylates tO are also known to be used to modify the elastomers of the low molecular weight Divinyl Piperylene Kauch. In addition to the mixture based on SKI-3, sulfur, dibenzthiazolyl disulfide (DBT), diphenylguanidine (DFG stearic acid, zinc oxide, and carbon black 2) are also added. Vulcanizates of these rubbers have relatively low elongation stresses, resistance to tearing and aging. The technical essence of the invention is a rubber mixture based on isoprene rubber, containing on 100 parts by weight of rubber, weight.ch .: Low-molecular weight butadiene rubber with nitrosodiphenylamine groups (SKDN) 1-2 Sulfur0.3-1.5 DBT0, 4-0.8 DFG1.0-4, -O Stearic acid 1.0-2.0 Zinc oxide 4,0-6,0 Technical carbon 20-80 and having a much better complex of properties than the previous rubber mixture. However, these rubber mixtures are all inferior to rubber mixtures based on natural rubber (NC) in such properties as cohesive strength (strength of unvulcanized mixtures) and stickiness according to Beru. The purpose of the invention is to increase the cohesive strength of the rubber mixture and its stickiness. The goal is achieved by the fact that a rubber mixture based on isoprene rubber, including 81 isomerically butadiene ka yk with gruppai nitrosodiphenylamine, sulfur, dibenztiazolildisulfid, ifenilguanidin, stearic kislou, zinc oxide, carbon black, acid 2,3,5,6etraftorgomotereftapevuyu For further comprises the following ratio ri remarkable combination, mae.ch ,: 100 Isoprene rubber. Low molecular weight butadiene rubber with nizrosodiphenylamine groups (SKDN) 1-2 2,3,5,6-Tetraftorgomoterephthalic acid 0.1-0.5 Sulfur 0.5-1.5 Dibenzthiazolyl disulfide0, 4-0.8 Diphenylguanidine 1,0- 3.0 Stearic Acid 1.0-2.0 Zinc Oxide 2.0-5.0 Technical Carbon 20-80 2,3,5,6-Tetratorgorg terephthalic acid (THC) has the formula FF) -t - (C) Si2so SKDN rubber used in the invention has a nitrosodiphenylamine content ranging from 5 to 20%. Example 1, a mixture of composition, MACH.: SKI-3 100; SKDN and THC is variable dosage; low molecular weight divinyl piperylene rubber 2 (only in the base solution); sulfur 1.0; DBT 0.6; FGD 3; zinc oxide 4; stearic acid 1,5; carbon 30, made on rollers and vulcanized in a press at 406 K for 20 minutes. The test results of rubber compounds and vulcanizates of them are given in table. 1. In parallel, they test (control) a mixture based on NK of a similar composition, but do not contain SKDN, THC or divinylpiperylene rubber. The rubber mixture (base solution) containing low molecular weight divinyl-piperylene rubber (SKDVP) has the following composition, wt.: SKI-3 100; SKDVP 10; sulfur 1; DBT 0.6; FGD 3; stearic acid 1; zinc oxide 5; carbon black 30. PRI mme R 2. Rubber mixture composition, mac.ch .: SKI-3 100; SKDN 2;

311345784

THC 0.5 (except for the prototype, where); sultry strength and stickiness better

DBT, DFG, zinc oxide, stearic acid, carbon black - variable dosages, made on rollers and vulcanized in a press. At 406 K for 5 minutes 20 minutes. The test results are summarized in table. 2, which shows the dosage of ingredients used. Listed in tab. 1 and 2, data 1 ((indicate that the rubber mixture of the proposed composition of the co-base solution, the prototype and is not inferior to the control, on NK. Vulcanizates from a mixture of the proposed composition are better than the baseline physico-mechanical parameters and not inferior to the prototype and control vulcanizates. Testing of the proposed rubber in semi-production conditions showed that, as compared with the prototype, the delamination of parts is reduced.

The strength of the mixture, IPA (cohe onnl strength)

Tack on Beru, gs / cm

Yaalr is not at 300Z lengthening, NPA

Strength at rastykekii, NLa

at 293 K

at 473 K

after at 373 K S for 72 h

Otiositelny lengthening, 2 Residual lengthening, Z Resistance to tear, KI / n Shore hardness

0.6

0.6

0.6

0.3 3000 2800 2900

poo

3.0

4.8

4.7

4.9

Indicators of mixtures and volcanic eats

Sulfur 0.5, stearic acid 1.0 DBT 0.4, zinc oxide 2.0, DFG 1.0, carbon black 20

Prototype (SKDN 2)

The strength of the mixture, nMPa (cogeionia)

Beru stickiness, gs / m

Stress at 300% elongation, MPa

Strength, Sha at 293 K

At 373 K

Yield of aging at .373 K for 72 h

Relative elongation Residual elongation,% Tear resistance.

Table 2

Dosage, ma.ch.

Sulfur 1.5, DFG 2.0, DFG 2, o, stearic acid 2.0, zinc oxide 5, O, carbon black 80

THC 0.5

Prototype

with TGC 0.5 (SKDN 2) SKDN 2 SKDN 2

1.0

0.7

8.0

8.0

Claims (1)

RUBBER MIXTURE ON THE BASIS OF ISOPRENE RUBBER, including low molecular weight butadiene rubber with nitrosodiphenylamine groups, sulfur, dibenzothiazolyl disulfide, diphenylguanidine, stearic acid, zinc oxide, carbon black, which is characterized by its cohesive strength, 2 , 3,5,6tetrafluorotomoterephthalic acid in the following ratio of components, wt.h .: Isoprene rubber 100 Low molecular weight buta diene rubber with nitro zodiphenylamine group- mi 1-2 2,3,5,6-Tetraforgom- terephthalic acid 0.1-0.5 Sulfur 0.5-1.5 Dibenzthiazolyl disul- feed 0.4-0.8 Diphenylguanidine 1.0-3.0 Stearic acid 1.0-2.0 Zinc oxide 2.0-5.0 Carbon black 20-80