SU857179A1 - Rubber mixture - Google Patents

Description

one

FIELD OF THE INVENTION The invention relates to rubber industry and concerns the development of a rubber compound based on butyl rubber and ethylene-propylene rubber.

Famous rubber mixture based on a mixture of butyl rubber and ethylene-propylene rubber, including a vulcanizing group, a vulcanization activator, a dispersing agent, an agent for improving the stickiness and cohesive strength of raw mixtures, a filler and a plasticizer - hydrocracking base oil | .

Also known is a rubber mixture based on a mixture of butyl rubber and ethylene-propylene rubber, comprising a vulcanizing group, a vulcanization activator, a dispersant, an agent for improving the tackiness and cohesive strength of the raw mixtures, a filler and a plasticizer, for example, stabiloyl-18 with a ratio

respectively, wt.%: 43.76: 7.72: 4.60: 2.57: 0.52: 1.29: 30.88: 11.32 2.

However, this rubber mixture does not improve the physico-mechanical properties of the mixture and rubber from it.

The purpose of the invention is the improvement of the physicomechanical parameters of the mixture and the rubbers thereof.

The goal is achieved by the fact that a rubber mixture based on butyl rubber and ethylene-propylene rubber, including a vulcanizing group, a vulcanization activator, a dispersant, an agent for improving the stickiness and cohesive strength of raw mixtures, an extender and a plasticizer, as the last mixture contains oil oil selected from the group: isoparaffin, hydrocracking oil, hydrocracked oil, hydrogenated, in the following ratio of components aec.Z;

Ethylene propylene butyl rubber 7, 72–19.18 new rubber Vulcanizing group 1, 48-1.60 pa

Volcanic activator2, 40- 2.57 zation 0.48- 0.52

Dispersant Agent for improving stickiness and cohesive strength1, 20-1,29 nosti raw mixtures 28,76-30,88 Filler Specified

11,32-17,74 plasticizer From the opars of its athens its oil (IS) is the product of hydroisomerization of petroleum paraffins, and the base oils of hydrocracking (BMH) and hydrocracking are hydrogenated (VMG) and the products of hydrocracking and subsequent hydrogenation of heavy oil raw material.

The properties of the proposed plasticizers and the properties of the known plasticizer - stabiloil-18 are summarized in table 1.

Examples 1-8. In the proposed rubber mixtures, the ingredients are taken in the following proportions, wt.%:

28.76-43.76 Ethylene propylene butyl rubber7, 72-19.18 new rubber 0.86-0.93 Sulfur 0.24- 0.26 Altax 0.38- 0.41 Thiuram 2.40- 2.57

Zinc white Stearin (dispers 0, 48 - 0,52 gator)

571794

Octaphor resin (tackifier)

1,20-1,29 28,76-30,88 Filler 5 M dammer 11,32-17,74

Make and test eight

mixtures of ingredients in the laboratory

rubber mixer (table 2.

Table 3 shows the mixing mode

proposed mixtures.

Optimum vulcanization is determined using the Metallist plant volcanometer. -Mixtures Vulcanize in electric frame presses. Volcanization regime 170 ° С, T Yu min.

Properties of mixtures and rubbers of them are presented in table. four.,

Tests have shown that the introduction of isoparaffinic oil, hydrocracking base oil and hydrogenated hydrocracking base oil to the mixture instead of stabilization-18 leads to a decrease in the residual elongation of vulkatzates, an increase in rebound elasticity, a decrease in hardness, a decrease in brittleness temperature, an increase in elasticity at low temperatures, improved ozone resistance, lowered brittleness, improved elasticity at low temperatures, improved elasticity. and performance and heat aging. The introduction of the proposed plasticizers also leads to an increase in the plasticity of the mixtures, a decrease in I SKOCTH according to Mymi and an increase in the time of the vulcanisation, which is favorable even under the conditions for the processing of chamber mixtures. The remaining indicators are about the same level.

Table 1

Kinematic viscosity, St,

Density, g / cm

Molecular Weight

Zastgeani temperature, С

7.6 0.86

280

290

-57

Color Dark

Group chemical composition:

paraffin-naphthenic

light aromatics

medium aromatics

I want automatics

Ingredients Butyl rubber 1675

new

7,727,727,72

512) 7.72

0,930,930,93

0.93

0.410.410.41 0.41

0,260,260,26 0,26

2,572,572,57 2,57

0.52.0,520,52

0.52

1,291,291,29 1,29

11.32

, Continuing tesbly. I

Pro-Ech Light-Whimshed

98.5-99.5

90.0

96-98

table 2

Mixture, N

19,1819,1819,18

0.86.0,860,86

0,380,380,38

0,240,240,24

2,402,402.40

0,480,480,48

1,201,201,20

1 23 I 4 5 6 Г 7 8,. -.... JL.-. - -. J. .- | - | fc. i-A -.--. J (i-a 43.76 43.76 FH, 76 43.76 28.76 28.7628.76 28.76 Ingredients —.-.. i..J ... J. Ioparaffin oil-11.32 Base hydrocracking oil - p ". Hydro-base hydrocracking oil - carbon black PM-50 30.88 30.88 Loading order of material 1G) min Rubber + + resin + + stearin + 1/2 oil 1/2 carbon black + 1/2 oil Unloading Mixture of stage 1 Sulfur + thiuram + a ltax Unloading General cycle Indicators Carrera plasticity, used unit 0.52 0.54 Mooney Viscosity, -t-ioO C 52 48 Tendency to basement; canization, s 600 660 Continued table. 2 A mixture of lit -..--- "-" .----- „". "" .. ..... 7..J.8 - - - 17.74 11.32 - - -17, 74 -11.32 - - -17.74 30.88 30.88 28.76 28.76 28.76 28.76 Table 3 ov Stage Mix temperature. Oc O T n / n 160 2 3,5 0 0,5P100-110 1,5 5,0 Table 4 Mixture, N ..J ..-. Lf- .. 0,53 0,60 0,58 52 46 41 37 31 36 640 660 660 720 720 720 Elasticity at -60 ° C,% 21 28 Endurance during repeated stretches, 1120510024 6885 cycles Heat aging coefficient 100 ° C 72 h: 0.890.88 in relative strength 0.710.64 0.60 lengthening for residual 0,450,63 0,45 lengthening Coefficient of temperature resistance 0,470,600,67 for strength in relative 0,860,740,71 lengthening for residual elongation 0,68 0,38 0,40

0.70 0.98 0.76 0.73 0.77 0.78

0.72 0.93 1.00 0.99 0.99 0.70 0.90 0.99 0.98 0.99 27 24 28 31 29 5378 5063 5016 4989 4805 0.80 t 0.959.971.00 1.0.7 0.57 0.660.570 , 51 0.50 0.46 0.510.860.74 0.87, 53 0.480.490.47 0.47, 74 0.600.510.50 0.53, 4 0.31 0.57 0.59 0.58 Form / ta of the Invention Rubber mixture based on mixtures of butyl rubber and ethylene-propylene rubber, including a vulcanizing group, a vulcanization activator, a dispersant, an agent for improving the tackiness and cohesive strength of raw mixtures, a filler and a plasticizer that differs in as a plasticizer oil selected from the group: isoparaffin oil, hydrocracking oil, hydrogenated hydrocracking oil, in the following ratio of components, wt.%: Vutyl rubber 28,76-AZ, 76 Ethylene-propylene rubber 7,72-19,18 12 Vulcanizing group 1,48 Vulcanization activator2, 40- 2.57 J icnepraTop 0.48-. 0.52 Agent for improving Stickiness and cohesive strength of raw materials 1.20-1.29 28.76-30.88 Filler Specified plate 11, 32-17.74 typifier Information sources taken into account during the examination 1. USSR author's certificate 64976, cl. From 08 K 5/01, 1976. 2. Technological regulations for the manufacture of autocameras based on il-rubber - 5RK-759 С5К-76-382), Ovsky Vshnny Plant.

Claims (1)

A rubber mixture based on a mixture of butyl rubber and ethylene-propylene rubber, including a vulcanizing group, a vulcanization activator, a dispersant, an agent for improving the tack and cohesive strength of crude mixtures, a filler and a plasticizer ₍ characterized in that, in order to improve the physical and mechanical properties of the mixture and rubbers from it, the mixture contains, as a plasticizer, petroleum oil selected from the group: isoparaffin oil, hydrocracking oil, hydrogenated hydrocracking oil, in the following ratio, wt.% : Butyl rubber 28.76-43.76 Ethylene propylene rubber 7.72-19.18 Vulcanizing group 1.48-1.60 Vulcanization activator 2.40 - 2.57 5 JfcicnepraTop 0.48-0.52 Agent for improving the stickiness and cohesive strength of raw syes Filler Specified Plasticizer 1.20-1.29 28.76-30.88 11.32-17.74 fifteen.