SU514864A1 - Rubber mixture based on natural or synthetic rubbers - Google Patents

Description

This invention relates to rubber technology. Rubber compounds based on natural or synthetic rubbers using mineral and carbon soot B are known as fillers. However, black rubber has insufficient resistance to heat aging and aggressive media. Also known is a rubber mixture containing organic part of shale (kerogen-70) as a filler. However, the initial kerogen-70 can be used only for partial replacement of carbon black in rubber (20-40% by weight of carbon black). With an increase in the proportion of the initial kerogen-7O, the strength of the filled rubbers decreases dramatically. The purpose of the invention is to increase the resistance of rubbers to the action of corrosive media and heat aging. This is achieved by the fact that the rubber mixture as a filler contains an isothermal product at 390-40 ° C kerogen-70. The filler modified by heat treatment without air is used in the amount of rubber compounds 45-. 50 weight, parts per 100 weight, parts of rubber. The rubber mixture may also contain ingredients commonly used in rubber technology: sulfur, vulcanization accelerators, activators, plasticizers, etc. Rubber mixtures are prepared on a laboratory roll in one stage, followed by vulcanization at 143 + 0.5 ° С in the Press, Example 1. On 100 weight. including butadiene rubber SKN-40 is introduced on the rolls 1.5 weight. h, stearic acid, 5.0 weight. including zinc oxide, 0.8 weight, h, captax, 45 weight, including modified filler and 15 weight, h, sulfur (vulcanizing agent). In tab. 1 shows the properties of rubber-based rubber SKN-4O, containing the proposed filler.

Rubber properties

Swelling in benzene, wt. %

Tensile strength at break,

2 kgf / cm

Relative elongation,% Residual elongation,%

Thermal aging coefficients (72 hours) Ke

Ke

Table 1

Test results

87

150 650 16 64 28 19

1.02 1.04

For comparison, rubber properties based on SKN-40 rubber filled with PM-15 carbon black and initial kerogen-70 are presented. The composition of the rubber mixtures is similar to example 1,

Rubber properties

Swelling in benzene, wt. %

Tensile strength at break, kgf / cm

Relative lengthening,% Residual lengthening,% Elasticity on rebound,% Hardness on TM-2

Tear resistance, kgf / cm

Heat aging coefficients (72 hours, 1OO ° С) Kbps

In tab. 2 shows the properties of rubber based on rubber SKN-40, filled with soot PM-15 and the initial kerogen-70.

table 2

Test results

Mix with PM-15

Mixture with kerogen 70

40

40 ZOO

50 60

0.82 0.76

Example 2. At 10O weight. h. styrene butadiene rubber SKS-ZOARKM-15 is introduced on a roll of 2 wt. h, stearic acid, 5, About weight. including zinc oxide, 1.5 weight, hours altax, O, 3 weight. including diphenylguanidine

Rubber properties

Tensile strength at break, kgf / cm

Relative lengthening,% Residual lengthening,% Hardness on TM-2 Elasticity on rebound,%

Heat aging coefficients (70 ° С, 72 h)

Swelling in benzene, wt. %

For comparison, table. 4 shows the properties of rubber from a similar composition on

Rubber properties

Tensile strength at break kgs / cm

Relative lengthening,% Residual lengthening,% Hardness on TM-2 Elasticity on rebound,%

Heat aging coefficient (70 ° С, 72 h) KdКе

Swelling in benzene, wt. %

40 wt. including modified filler and 2 weight.h, sulfur.

In tab. 3 shows the properties of rubber based on the SCS-ZOARKM-15 rubber containing the proposed filler.

Table 3

Test results

110 550

sixteen

60

32

0.98 0.99 85

SKS-ZOARKM-15 rubber base filled with carbon black IM 5.

Table 4

Test results

110

480

14

56

37

0.75 0.77

10A

7

Example 3. 100 weight. including natural rubber (NR), 0.5 wt. including stearic acid, 5.0 weight. including zinc oxide, 0.7 wt. h. captax, 40 wt.

Rubber properties

Tensile strength at break, kgf / cm

Rebound elasticity,% TM-2 hardness

Tear resistance, kgf / cm. For comparison, see table. 6 shows the properties of rubber from NK, filled with carbon soot PM-15. From the data table. 1-6, it can be seen that 1 phase of a rubber mixture based on natural or synthetic rubbers allows c.

Rubber properties

Tensile strength at break, kgf / cm

Rebound elasticity,% TM-2 hardness

Tear resistance, kgf / cm

Claims (1)

Invention Formula Rubber mixture based on natural or synthetic rubbers, containing a filler, characterized in that, in order to increase the durability h, a modified filler and 3 wt. h. sulfur. In tab. 5 shows the properties of rubber from NK containing the proposed filler. Table 5. Test results 140 62 60 31 25 Table 6 Test results 150 60 56 27 rubber to heat aging and to the action of solvents, as a filler, it contains 40-45 weight. including isothermal treatment at 39 ° -400 ° C organic part of the shale kerogen 10O weight. rubber h. It is impossible to obtain vulcanizates with physicomechanical properties close to those of black rubber. Vulcanizates are characterized by high resistance to heat aging and solvents.