SU1449567A1 - Rubber mix vulcanization process - Google Patents

Abstract

The invention relates to the rubber industry, in particular to a method for vulcanizing a rubber compound, and can be used in the manufacture of heat-resistant rubber seals. The invention makes it possible to increase the heat resistance of rubber from the mixture and to simplify the method due to the fact that branched butadiene rubber with a content of 1.4 units from 5.5 to 45% by weight in an amount of 5-20 wt.h is introduced into the rubber mixture. on 100 ma.ch. rubber and vulcanization in the press is carried out at 140-170 0 with subsequent post-curing in hot air at 100-175 s for 1-24 hours. Table 7.

Description

 "

ABOUT)

The invention relates to the rubber industry, in particular to the method of vulcanizing the rubber compound, and can be used in the manufacture of heat-resistant rubber seals.

The purpose of the invention is to increase the heat resistance in the stressed state of Lezin from the mixture and to simplify the process. I EXAMPLE 1 1.4 to 45 wt.%. ; The composition of the mixture is given in table. 1, I The vulcanization mode for rubber of | SKEPT-40:

I 1, temperature, time | 15 min (known); I 2. temperature, time | 15 min, followed by thermostating at 175 s for 2 h (izveshiy);

3. temperature, time 30 minutes, followed by dovulkayizatsiya in a thermostat in one of the modes: 150 ° C for 6 h, 175 ° C for 1 h, for 3 h (proposed).

The vulcanization mode for rubber SKY-40:

1. Temperature 150 ° С, time 30 min (known);

2.temperature, time

30 minutes followed by thermostating at 150 ° C for 6 hours (known);

3. Temperature 140 ° С, time

30 min followed by pre-vulcanization in a thermostat in one of the modes: 100 ° C for 24 h, for 6 h (suggested).

On samples vulcanized in the specified modes, the heat resistance index is determined by the time of accumulation of the critical value of relative residual deformation under compression (80%) and the physicomechanical properties of rubber. Temperature test for heat resistance 150 and 175 C.

Scientific research institute

The properties of rubber are given in table. 2

50

0

0

five

0

five

five

PRI me R 2, similar to example 1, but the butadiene rubber SKDLR contains 5.5, 23 and 95 (counter.) Wt.% Links 1,4.

The properties of rubber obtained by the known and proposed method are given in table. 3

PRI me R 3. Similar to Example 1, but the SKDLR rubber contains 5.5% of 1.4 units and is introduced into the mixture in the amount of 5 and 20 wt.h.

The properties of rubber obtained by the known and proposed method are given in table. four.

PRI me R 4. Similar to example 1, but has a different vulcanization mode.

Modes and properties of rubber are presented in table. five.

PRI me R 5. Make a mixture on the basis of butadiene-nitrile rubber SKN-18 is similar to 1, but use. Butadiene rubber brands SKDShTR with content of links of 1.4 to 5.5 wt.% And SKD-RSM-Yu with the content of links. 1.4 25-35 wt.% And in the amount of 5 and 20 wt.h. inject it into the mixture.

Properties of rubber are presented in table. 6

Example 6 is similar to Example 5, but the mixture is prepared on the basis of SKN-26 grade butadiene-nitrile rubber.

The rubber properties are presented in Table 7.

Claims (1)

Invention Formula The method of vulcanization of a rubber mixture based on ethylene-propylene-diene or butadiene-nitrile rubber with an epoxy vulcanizing agent, including: vulcanization in a press with subsequent curing in air, characterized in that, in order to increase the heat resistance in a stressed state of rubber from it and simplification of the method, branched butadiene rubber with a content of 1.4 to 5.5-45 wt.% in an amount of 5 to 20 wt.h. is introduced into the rubber mixture. on 100 ma.ch. rubber and vulcanization in the press is carried out at 140-170 0 followed by pre-vulcanization in the environment of hot air at 100-175 0 for 1-24 hours. SKEPT-40 100.0 100.0 - - SKN-40 - - 100.0 100.0 Peroxymon F 40 SKDLR Zinc oxide Technical carbon H-803 60.0 60.0 60.0 60.0 6.0 6.0 5.0 5.0 10 - 10 5.0 5.0 5.0 5.0 1449567 8 Continuation of table 4 45 (SKD-RSM- -fO) 1.0 5.0 20.0 1.0 3.0 20.0 IEvest ny (counter.) Proposed Known (counter.) Proposed Known (counter.) Proposed Known Scont.) Proposed Known (counter.) Proposed Known (counter.) Proposed 15040 1 "030 150ad 14030 150W 140-30 15040 14030 15040 t “030 15040 14030 10.4 380 2.3. -112 1SO. 3 11.1 300 2.7. -to4  10.4 320 2.5-K10 H 11.1 310 2.5-817 15G S50 150 150 10.5 270 3.5 -8 3 12.0 250 3.6 -3 12.5 250 4.6 - 17 9.8 280 3.7 -4 7 3 10.0 275 3.7 -2.5 12.3 240 4.8 -4 R ,about 150 12.3,200 5.1. -; 3 12.9 200 5.0 -2; .22 .Table 610, 5 270 3.5 -8 3 12.0 250 3.6 -3 17 9.8 280 3.7 -4 7 3 10.0 275 3.7 -2.5 12.3 240 4.8 -4 12.5 250 4.6 - R ,about 12.3,200 5.1. -; 3 12.9 200 5.0 -2; .22 t, 0 vmvtyvny 5.0 HsBeet tl honf.) T30 40 TsiopaTable 7 15.2 MO 14.3 -3,815  50 314.3 120 12.5 -2.024