SU1043153A1 - Vulcanizable rubber stock based on carbochain rubber - Google Patents

Abstract

VOLCANIZABLE RUBBER MIXTURE ON THE BASIS OF CARNOFECK RUBBER, Including Furnace carbon black in the form of aggregates of spherical particles with a coefficient of porosity t-1.1 and degree of intergrowth of particles in the aggregate of 0.03-0.09, with a target reducing viscosity and increasing the carcass of the rubber mixture, as well as increasing the electrical conductivity of vulcanizates, the rubber mixture additionally contains graphite in a ratio of technical carbon 1: 0.25-9 in the following ratio of components, wt.h. cue carbon 20-90 g Grafit10-80

Description

The invention relates to p-eic industry, in particular to volcanic rubber compounds for antistatic and electrically conductive products.. A known vulcanizable rubber mixture based on carbon chain rubber including graphite and active technical carbon having a surface porosity ratio of 2.4-3 and a macropore surface ratio. and micropores 1: 2-4 1. However, microporous carbon black is an expensive product and has low reinforcing properties, with the result that the resulting rubber has low strength properties. Closest to the proposed technical essence and the achievable positive effect is a vulcanizable rubber mixture based on carbon chain rubber, which includes, as a filler, furnace carbon black in the form of aggregates of spherical particles with a coefficient of porosity of 1-1.1 and the degree of accretion of particles into aggregate 0,030, 09 2, Rubber / obtained from yes | 1th mixture have high strength properties, but have low electrical conductivity. In addition, the rubber mixture has a high viscosity, which makes it difficult to obtain molded and extruded products. The decrease in the viscosity of the rubber mixture by the introduction of plasticizers is accompanied by a sharp decrease in its toughness. The aim of the invention is to reduce the viscosity and increase the carcass of the rubber compound, as well as to increase the electrical conductivity of the vulcanizates. The goal is achieved by the fact that vulcanizable rubber mixture based on chain-chain rubber, including furnace carbon black. In the form, aggregates of matched spherical particles with a porosity coefficient D-1.1 and a degree of intergrowth of particles in the aggregate 0.03-0.09, additionally contains graphite in relation to carbon black 1: 0.25-9 with the following corresponding 1 Wearing components, wt.h .:. Carbon chain rubber 100 Technical carbon 20-90 Graphite 10-80 Example. In a laboratory mixer at 90-100C, a rubber mixture of the composition is prepared, w.h.: SKMS-ZOARK 10 butadiene methylstyrene rubber, stearin 2, zinc oxide 5, altaks 2, sulfur 2, carbon black technical carbon-105 3 10. PM-105 technical carbon has a particle diameter of 203 J, a specific surface area of CTAB 105 MVr, a specific surface area of nitrogen 112 mg / g, dibutyl phthalate adsorption 103 ml / 100 g, an average degree of aggregation of particles in the aggregate 0.09 and a porosity coefficient 1.07. Rubber; mixtures are tested on a Mooney viscometer at 130s in accordance with GOST 10722-76. The skeleton of the composition is determined on a defometer at 80 ° C and the load on the sample is 500 g. The ratio of the height of the sample after 10 min to the height after 30 s of the specified load is taken as the skeleton index. Vulcanization of rubber compounds was carried out in a press for 80 minutes at 143 ° C. The strength properties of rubber are determined in accordance with GOST 270-75, a. specific volumetric resistivity - potentiometric method. The test results of rubber compounds and volcanic efes are given in table 1. And p 2. In accordance with example 1, a rubber mixture with a graphite content of 25 mph is prepared and tested. The test results are given in table 2. Primёrz. Similarly to examples 1 and 2, a rubber mixture with a graphite content of up to 30 mash is prepared and tested. and maintenance of technical coal up to 30 ma.ch. The test results are shown in table 1. EXAMPLE 4 Analogously to Example 3, the rubber mixture was prepared and tested. C. graphite content up to 60 mah. The test results are shown in table 1. Froze Analogously to example 1, a rubber mixture with a carbon black content of 90 wt. The test results are shown in table 1. PRI me R 6. At the laboratory rollers, at a roll temperature of 20-30 ° C, a rubber mixture is prepared, weight: h: nairit CR-50 100 chloroprene rubber, zinc-4; magnetite 7, stearin 1, technical carbon P-226M 20, graphite GE 3 80. Technical carbon P-226M has a particle diameter of 220 A, specific surface area according to CTAB 100, specific surface area for nitrogen 105 MVr, dibutyl phthalate adsorption 102 ml / 100 g the degree of accretion of particles in the aggregate is 0.03 and the porosity coefficient is 1.05. The test results of rubber are given in table 2. Example7. On the laboratory rollers, at a temperature of rolls of 50 ± 5s, a rubber mixture of soetava is prepared, wt.h .: SKMS-30 ARK 100 styrene butadiene styrene, stearin 2, zinc 5 cies, altack 2, sulfur 2,

technical carbon PM-105 75, graphite GE-3 25. The test results of the slaughter are shown in table 3.

As can be seen from the data in Table 1, the rubber mixture from the graph of sml three equal to the contents of the technical

carbon smolder, in comparison with and known for 3-16% lower BHSKOCtb and 4-32% higher skeleton. The vulcanizates with graphite are also superior to the known rubber in electrical conduction by 0.25-10 times,

; T a b l to c. A 1

.Content on: 100 mac. rubber, ma.ch. carbon black. graphite The ratio of graphite and technical coal 1: 5 .1 {2 1: 1 kind of rubber properties

16 17 18 18

/

58 60 42 46

76 82. 56 65

Vulcanizate properties

Breaking strength, MPa27.2 19.8 14/2

Specific volumetric resistivity,

7.40 540 670

Contents on 100 mach. rubber, ma.ch.

carbon black

. graphite

The ratio of graphite and carbon black. The degree of accretion of particles in

carbon black aggregates

Carbon Black Porosity

1B 17

14

.63 72

50 49

108 93

12.4 14.9

28.1 23.6 15.4

410 32

980 4400

96

100 50 30 1: 0.5 1: 9 months

Properties of rubber compounds

Minimum viscosity at 130 ° C, sr. units

Framework,% Rubber properties

Breaking strength, MPa 13.7

Specific volumetric resistivity, CWM9,4

Contents on 100 mach. rubber, ma.ch.

carbon black

graphite

The ratio of graphite and carbon black

The degree of accretion of particles in aggregates of carbon black

The coefficient of porosity of carbon black Properties of rubber compounds

Minimum viscosity at 130 ° C, sr. units

Frame,%

Rubber properties Strength at break, MPa 14.2

Specific volumetric resistivity, OhmM

Continued table. 2

124 99

77 74

8.9 15.6

Table 3

75 25

100

0.15

1.05. 2, 20

Claims (1)

VULCANIZED RUBBER MIXTURE ON THE BASIS OF CARBOCYPE RUBBER, including Furnace carbon black in the form of aggregates of fused Spherical particles with a porosity coefficient of 1-1.1 and a degree of fusion of particles in the aggregate of 0.03-0.09, which is the same as that, in order to reduce the viscosity and increase the carcass of the rubber mixture, as well as increase the electrical conductivity of the vulcanizates, the rubber mixture additionally contains graphite in the ratio of carbon black 1: 0.25-9 in the following ratio of components, parts by weight: Carbose rubber Technical coal Herod Graphite>