SU663701A1 - Vulcanizable unsaturated rubber-base compound - Google Patents

Description

properties, as well as heat resistance and resistance to aggressive environments. Nitroso compounds are well distributed in mixtures, without causing technological difficulties in the manufacture of rubber. Rubber samples are vulcanized for 20 min. Testing of rubber after vulcanization (carried out according to GOST 270-64. Table 1. shows the formulation of the composition and physical and mechanical parameters of vulcanizates based on isoprene rubber (SKI-3) with p-NDFA or NMD nitroso compound in various ratios. From this table 1 it can be seen that the use of nitroso compounds with a novolac resin with a hardener gives rubber high strength and elastic properties. Example: A composition is prepared as in Example 1, for 100. lu.ch. of butadiene rubber. resin, 4 lb. of hexamethylenetetra Ina, 0.01-1.0 May. p-NDFA or NMA, I process the mixture at 70-15 ° C for the time necessary to achieve maximum viscosity. Then the remaining ingredients are introduced: softeners, vulcanizing group, decorators. The composition is processed in the usual way. Table 2 shows the formulation of the composition and physico-mechanical parameters of vulcanizates based on butadiene rubber SKD with nitroso compounds of p-NDFA or IA in various ratios. From the data of Table 2 it can be seen that the use of a thermosetting resin in combination with a nitroso compound gives vulcanizates high strength properties. Example 3. A composition was prepared as in Example 1. At 100 mph. SCR-30 styrene butadiene rubber takes 40 ma.h. Novolac resin. 4 ma.ch. hexamethylenetetramine, 0.11, 0 wt.h. p-NDPA or IA. The mixture is treated at 70-150 ° C for the time necessary to achieve maximum viscosity. Then the remaining ingredients are entered: softeners, vulcanizing group, accelerators. The resulting composition is processed in the usual way. From the data of Table 3, it can be seen that the use of a thermosetting resin in combination with a nitroso compound leads to an increase in the strength and electrical resistance of the rubber. PRI me R. four . The composition is prepared as in Example 1. At 100 mash. SKMS-ZORP butadiene-methanol rubber takes 40 ma.h. Novolachova Emetz 4 ma.ch. hemeamethylenetetramine 0.1-1.0 wt.h. p-NDPA or IA. The process is treated at 70-150® for the time required to achieve the maximum viscosity. Then the remaining ingredients are compounded: softeners, a vulcanizing group, accelerators. The resulting composition is processed in the usual way. Table 4 shows the reca ptura and the physicomechanical characteristics of vulcanizates on aaine butadiene methylethyrene rubber based on SKMS-ZORP. From the data of Table 4 it can be seen that the use of a thermosetting resin in combination with the nitroso compound p-NDPA or NMA gives vulcanizates high strength and elastic properties. Example 5. In a composition comprising 100 ma.h. rubber, 40 mach. fillers, 22 mach. vulcanizing agents, 5 mah. Gchiteli, 4 ma.ch. steam generators, 40 ma.ch. Novolachova and 4 ma.ch. Hexamethylenetetramine, administered by the usual drug in the process of mixing p-NDPA or NMA in the amount of 0-1-1, O mac.h. Compositions are prepared on rollers at 80-140 ° C. Nitro compounds are well distributed in mixtures without causing technological difficulties in the manufacture of rubber. Rubber samples with a thickness of 6.0 mm are vulcanized in hydraulic pressure psi at a temperature of 155 + 5 ° C for 12 minutes at a pressure of 50 kg / cm, then the pressure is removed and the sample is allowed to foam. Table 5 shows the recipe, Table 6 shows the physico-mechanical properties of the vulcanizates proposed and obtained in industry. Example 6. In a composition comprising 100 ma.ch. isoprene rubber SKI-3 1,0-50 mach. Emols are administered by conventional medication in the procedure of p-NDPA in quantities of 0.6 wt.h. The mixture is treated at 70-150 ° C. for the time required to achieve maximum viscosity. Then the remaining ingredients are introduced: filler, softener, vulcanizing group, decorators at the same or lower temperature. The resulting composition is processed in the same way as in Example 1. The vulcanized products have high strength and plastic properties, heat resistance and resistance to agri-active treatments. Tables 7 and 8 show the formulations, and the physicomechanical indicators of vulcanizates on the oenove of isoprene rubber SKI-3. From the data of Tables 7 and 8, it can be seen that when containing a large amount of inorganic fillers, it is advisable to use small emol additives (see table 7). In the case of the formulation of inorganic fillers, the content of emol can be increased from 10 to 50 wt.h. From the developed vulcanized rubber, it is possible to produce rubber with increased strength evoyetvami using more modern technology, which allows to exclude the use of up to 5663701g

crescent and scarce resins. With neither expected economic effect

industrial use ieobretaSostavy (mac.) rubber mixtures (compositions), the conditions of their vulcanization and physico-mechanical properties of rubber

will be about 200 rubles. per 1 ton of mixture, Table 1

Compositions (by weight) of rubber compounds (compositions), their vulcanization conditions and physicomechanical

rubber performance

Ingredients and Indicators

Cis-1,4-butadiene rubber (ACS)

Novolacna phenol-formaldehyde resin iditol

Hexamethylenetetramine

Sulfur

table 2

The composition

with a nitrosoadminaa compound without resin

100

100

100

40

40 4 2

4 2

Composition (parts by weight) of rubber compounds (compositions), their vulcanization conditions and physical and mechanical properties of rubber

Ingredients and Indicators

Butadiene styrene rubber (SCS-30)

Novolacna Phenol Formaldehyde Processing Temperature, ° С

Continuation of table 2

T a

faces

The composition

with a nitroso-offered compound without resin

100

100

100

100

140

140

140

140

Processing time, min

The composition (parts by weight) of rubber mixtures (compositions), the conditions of their vulcanization and the physico-mechanical properties of rubber

Butadiene Methylstyrene

rubber (SKMS-ZOPR)

Novolacna phenol-formaldehyde resin iditol

Resolna aniline formaldehyde resin 211

Processing time, min

1010

20

20

20

Table

100

100

100

100

40

40

40

15

15

ten

ten

20

Composition (mach.) Of rubber compounds (compositions), and the conditions for their vulcanization

Processing time

fvWH

Table 5

ten

15

15

10 Physical and mechanical indicators

True strength, kgf / cm

Strength at break, kgf / cm

Relative extension , %

Residual elongation,% Hardness according to TM-2, used

P

Abrasion, cm / kWh Density, g / cm

Tear resistance, kg / cm

Composition (mach.) Of rubber mixtures (compositions), their curing conditions and physicomechanical

Processing temperature, C

- - ---------------- -

Processing time, me

663701

14

Table

Table 7 rubber indicators

140 140

140

15 15

15

Composition (parts by weight) of rubber compounds (compositions), their vulcanization conditions and physical and mechanical properties of rubber

Table 8