SU1004419A1 - Vulcanizable rubber stock - Google Patents

Description

(5) VOLKANIZABLE RUBBER MIXTURE

one

The invention relates to the rubber industry and is developing a rubber compounding formulation based on synthetic rubber, in particular, non-SRI triple or ethylene propylene diene rubber.

A vulcanizable rubber compound based on synthetic rubber is known, in which phthalic anhydride is used as a retardant in dosages of 0.2-0.7 May. hours at 100 May. including rubber C 1.

However, rubber from a known rubber compound does not differ in high heat resistance.

A known vulcanizable. Rubber mixture based on synthetic rubber, filled with white soot, where diethylene glycol is used as a vulcanization activator, which is also a plasticizer and a modifier of the surface of the filler. At the same time, vulcanizates have high hardness, 2.

However, these aulcanizates do not possess satisfactory heat resistance.

A rubber compound based on butadiene nitrile and natural rubber is known, vulcanizable in the presence of 2-methylcaprolactam LZ.

The use of this mixture does not allow for the preparation of vulcanizates with increased heat resistance, which limits their use in a number of industries and mechanical engineering, for example, as covering rubber for shafts operated at elevated temperatures.

The aim of the invention is to increase the heat resistance of rubber.

The goal is achieved by the fact that a rubber mixture based on a diene rubber, vulcanizable, containing a modifying additive, coflepmvir as a modifying β-caprolactam, phthalic dihydride and

3lO

diethylene glycol in the following ratio of components, wt.ch .: I Diene rubber 100

6-caprolactam 2-15

Phthalic anhydride 2-10

Diethylene glycol 2-10

Examples -8. Rubber compounds based on butadiene nitrile. rubber vulcanized in electric pressure for 60 minutes at.

Examples S-l. Rubber mixtures based on ethylene-propylene-diene rubber are vulcanized in an electric press for 60 minutes at.

Table 1 shows the composition of rubber compounds based on butadiene nitrile rubber.

The data presented in table 2 and k indicate that the coefficient Butadiene nitrile 100

100 rubber SKN-TsO

resin

Technical carbon PM-75

Aerosil 175 Dibutils alat Caprolactam Phthalic anhydri Diethylene glycol

194

The heat resistance coefficient of rubbers from the proposed mixture is 1.5 times or more higher than that of known rubbers.

The use of the proposed rubber compounding allows to increase the service life of rubber products operated at elevated temperatures.

Table 2 presents the properties of the vulcanizates based on butadiene nitrile rubber.

Table 3 shows the composition of rubber mixtures based on ethylene-propylene-diene rubber. Table 4 presents the properties of vulcanizates based on ethylene-propylene and New Rubber.

Table 1

100

100

100 100

100

“+5

kS

A5

 S

18.0 13.2 17.6 17, 18.5

Conventional strength at stretching, MPa

580 580 590 ff90. 560

Relative 570 elongation at break

6.9 7.2 7, 9.810.3

Proven prospective- 7.3

Aging nocjje aging 150 С X 72 h MPa OjtO ratio

0.38 0.39 0, it2 0.56 0.56 heat aging strength

table 2

18.3 480

11.5

0.73 0.63

Claims (3)

Table 3 Conventional strength 9.2 when stretched, MPa Relative 590 elongation at break,% Heat aging coefficient С х X 72 h 0.4 0.8 strength by strength 0.5 0.1 O, it by relative- 0.2 Formula of Invention A vulcanized rubber compound based on a diene rubber containing a modifying agent, so that, in order to increase the heat resistance of rubber, it contains a mixture as a modifying agent. -caprolactam, ft of left anhydride and diethylene glycol in the following ratio of components, May. h: Table C 10.2 11.1 0.7 0.4 Diene rubber 100 -Caprolactam 2-15 Phthalic anhydride 2-10 Diethylene glycol 2-10 Sources of information taken into account during the examination 1. Rezinchik handbook. M., Hii, 1E71, p.319. 2. In the same place, p.312. 3. Author's certificate of the USSR N410033, cl. C 08 L 9/00, 1971 (prototype).