SU514865A1 - Rubber mixture based on unsaturated rubbers - Google Patents

Description

BACKGROUND OF THE INVENTION The invention relates to rubber centimeters based on unsaturated rubbers, vulcanizable at both low and elevated temperatures. Known rubber mixtures based on unsaturated rubbers, containing thiuram as a vulcanizing agent, and dithiocarbamate, for example, zinc dithiocarbamate (cymat), as a vulcanization accelerator. However, high-speed modes, for example, on continuous vulcanization units, these accelerators are not effective enough. Known rubber compounds have a low resistance to undercoating, and the rubber produced is not sufficiently heat resistant. In order to increase the resistance of the mixture to scorching and heat resistance, we obtain rubber; the proposed rubber mixture contains the zinc salt of hexamethylene bis bis-dithiocarbamic acid as an accelerator. Rubber mixture includes, weight. h .: Rubber100 Thiuram2,5-4 Zinc salt of hexamethylene bis-dithi-carbamic acid O, 5-1O The mixture contains commonly used ingredients such as fillers, plasticizers, antioxidants. The mixture may also contain micro dosages of sulfur. Rubber compounds are made according to the accepted technology. Example 1. Insulating rubber is made on rollers according to recipes 1 and 2. Test specimens are vulcanized in an electrically heated press at 2 ° C and 143 ° C. Testing for scorching is done according to GOST 423-53, for physical and mechanical properties - as per GOST 270-64, for heat aging - as per GOST 271-67, for electrical characteristics - as per GOST 2068-7О. Example 2. Insulating rubber is made on rollers according to the recipes 3

and 4. The test specimens are vulcanized in a press at 2 ° C, the scorching test and the physical and mechanical properties are carried out according to the procedures indicated in Example 1.

Example 3. Hose rubber is made on rollers according to recipes 5 and 6.

Test specimens are vulcanized in a press at 120 ° C. Scale tests, physical and mechanical properties, and heat aging are carried out according to the procedures given in Example 1,

Recipes rubber compounds are given in table. 1, and indicators of the properties of rubber in the table. 2-5.

Recipes rubber compounds Recipe Ingredients.

Natural rubber SKS-30 ARPD

SKS-ZO (without heat treatment SKBM-5Or

Neozon D

Sulfur

Tiuram D

Tsimat

Captax

Diphenylguanidine

Resin m. 18

Glycerol

Zinc salt hexamethylene bis-dithiocarbamic acid Zinc oxide

Stearic acid2,002,00

RosinParafin3, 003.00

The PPT-Varnish bitumen grinder is bituminous -

Chalk separated 168,95170,95 Soot PGM-33

Table 1

50.00

50.00 50.00 50.00

10,0010,00

9О, ОО9О, 00

1.00

1,001,00

1,330.30 3-, 00 3.00

0.22

1, OO

0,891.00

0.80 1.00

0.75

1, 00 5.00

5,005,00

2.50

3.002, OS 1.50

14.00

11,5011,50

3,003,00

207.08

93, -B94,42 weight. hours per 100 weight. rubber rubber 345b

Tendency of rubber compounds to scorch

table 2

Changes in the physicomechanical parameters of rubbers in the process of thermal aging at 120 ° С

Claims (1)

Table 4 9 As shown in the table. 2-5, the use of the zinc salt of hexamethylene-bis-dithiocarbamic acid as a vulcanization accelerator significantly increases the effectiveness of the vulcanizing group, as well as the heat resistance of the vulcanizate, especially obtained by low-temperature vulcanization. Low-sulfur rubber with zinc salt of hexamethylene-bis-dithiocarbamic acid - 10 plots is less prone to vulcanisation than sulfur sulfide with rubber. Formula of the invention Rubber compound based on unsaturated rubbers. thiuram, dithio5148 65 10 carbamate and other commonly used ingredients, characterized in that, in order to increase the resistance of the mixture to vulcanisation and heat resistance of the obtained rubber, it contains the zinc salt of hexamethylene-bis-dithiocarbamic acid at the next ratio of ingredients. weight. including: Kauchuk1OO Thiuram2,5-4 Zinc salt hexamethylenebis-dithiocarbamic acid 0.5-1.0