SU759557A1 - Rubber mixture - Google Patents

Description

The invention relates to the technology of rubber production and can be used in the manufacture of products with high dynamic performance based on a combination of limit and non-5 limit rubbers.

To increase the heat resistance of rubbers, combinations of unsaturated and saturated elastomers are used [1]. However, their use reduces the physical-10 mechanical performance of rubber.

The known rubber mixture based on butadiene nitrile and ethylene-propylene rubbers, including sulfur, sulfenamide, dicumyl peroxide, stea-, 5 rin, zinc white, carbon black [2].

However, the obtained rubbers have low values of conditional stress at elongation, insufficient elongation during repeated deformations and heat resistance. ·

The purpose of the invention is to increase the conditioned stresses, dynamic endurance and heat resistance. 25

This goal is achieved by the fact that the mixture is based on ethylene-propylene and butadiene nitrile rubbers ", including sulfur, sulfenamide, dicumyl peroxide, stearin, white zinc-30

technical carbon, additionally contains α-oxychloroethyl acrylamide or α-oxychloroethyl methacrylamide in the following ratio of components

mass parts:

Ethylpropylene

rubber

Butadiene nitrile

rubber

Sulfur

Sulfenamide Dicumyl Peroxide

'Stearin

White zinc Technical carbon Ν-oxychloroyl acrylaglad or Ν-oxychloroethyl methacrylamide

30.0-40.0

70.0-60.0

1.0-1.5

0.5-1.0

1.5-2.0

1.5-3.0 5.0-7.0 30.0—40.0

1.0-1.5

In the mixture composition, mass SKM-40M 70.0-, SKEPT 30.0; sulfenamide 0.5; dicumyl peroxide 1.5; stearin 1.5; zinc white 5.0; sulfur 1.0; technical carbon 30.0 additionally introduces Ν-oxychloroethyl methacrylamides in the amount of 1.0 wt.h. The latter are introduced together with the vulcanizing group in a rubber mixer or on rollers heated to 353–393 ° K. rubber low degree of unsaturation.

759557

The mode of manufacture of the mixture is given in table. one.

Table 1

Name ingredients The time from the start of mixing, min SKEPT 0 Ν-oxychlormethacrylamide five Sulfenamide 6 Peroxide dicumila 7 Sulfur eight Stearin + zinc white 10 Carbon black 13 SKN-40M _

15

ten

Continued table. 2

..... ' four 2 one * Abrasion cm "® / kWh. 340 330 Heat coefficient aging when 373 K, long-. 72 hours - on the limit to 0.83 1.0 by relative elongation 0.72 0.75

In the rubber mixture composition, wt.h .: SKN-40M 60.0? SEPT 40.0? sulfenamide 1.0? sulfur 1,5? dicumyl peroxide 2.0? stearin 3.0? zinc white 7.0? carbon black 40.0 additionally injected Ν-oxychloroethylacrylamide in the amount of 1.5 wt.h.

Vulcanization of rubber compounds produced in the press at a temperature

20

446 ° K for 20 min.

data characterizing the properties

rubber listed in Table. 2

Table 2

25

Characteristics of the A mixture of os- Mixture, zine mixture new the content composition eating without-οκ- Ν-hydroxy sichloro- chlorine- ethanol ethanol Rilamides krill _h -. (meta rilami- Yes) four 2 3 Conditional voltage ^one at 300% elongation, MPa 12.3 14.9 Tensile strength at break, MPa 25.7 24.9 Resistance tear, kn / m 64 67 Relative yield fading,% 535 532 Elasticity by slope,% 20 20 TM-2 hardness, unit tv 66 67 Destruction ₍ by RFI, thousand cycles 620 8.48 Heat Formation with multiple compression, ° K 347 340

Editor A. Pavlyuk

thirty

35

40

45

The use of these compounds in the mixture on the basis of a combination of rubbers of varying degrees of unsaturation allows a significant increase in the dynamic endurance of rubber while simultaneously increasing the conventional stresses and maintaining the other properties at the same level.

Claims (1)

Claim Rubber, a mixture based on ethylenpropylene and butadiene nitrile rubbers, including sulfur, sulfenamide, dicumyl peroxide, stearin, zinc white, carbon black, characterized in that, Ν-oxychloroethyl methacrylamide in the following ratio of components, wt.h .: Ethylene propylene rubber Nitrile butadiene rubber Sulfur Sulfenamide Peroxide dicumila Stearin 30.0—40.0 70.0-60.0 1.0-1.5 0.5-1.0 1.5-2.0 1.5-3.0 5.0-7.0 White zinc Technical carbon 30.0-40.0 Ν-oxychloroethyl acrylamide or 50 M-oxychloroethyl methacrylamide 1.0-1.5