RU1801969C - Rubber mixture - Google Patents

Abstract

Usage: tire and rubber industry, fastening rubber to brass-plated steel cord. SUMMARY OF THE INVENTION: The rubber composition contains May. h.: carbamide unsaturated rubber 100: chamois vulcanizing group 3-6; zinc oxide 4.5-10; filler 50-80; m m 3-10; modifier 0.5-5; the antioxidant is 0.5-3.5 and as a dispersant, undecadienedilone of the formula CH3 — CH — CH — CH (OH) —CH2 — CO — CH2— —CH (OH) —CH2 — CH — CH — CH3 or a 3-hydroxy glycolic acid polyester pier m. 600-1000. The dispersant content is 1-4 hours. The nominal tensile strength of the rubbers at 300% tension is 19-20 MPa, the nominal tensile strength is -22.5-23.3 MPa, the bond strength of the rubber with cord 4 l 22 at 20 ° C 36-40 kN / m, after boiling in a 5% NaC solution for 6 h, 31-32 kN / m, after aging in a vapor-air medium

Description

the resinous unsaturated connection of the linear structure of the following structure

sn3-sn sn-sn-cng- s-sn2 sn he about

he

- SNp CH - CH CHj

The polyester of 3-hydroxyglycolic acid (Temporary TU 8-0752-90) is a solid polyester resin with a molecular weight of 600-1000 and contains mainly low molecular weight fractions of the 3-hydroxyglycolic acid polyester (up to 96% May) mixed with sorbic oligomers acids and their salts, a catalyst for the synthesis of 3-hydroxyglycolic acid polyester and other additives.

The formula of the polyester 3-oxyglycolic acid:

sn5 sn sn-sn-sn2-s

about

I

about

I

I

where n is 4-8.

Rubber compounds, the composition of which is given in table. 1, is prepared in a laboratory rubber mixer in 2 stages at a rotational speed of 60 min-1. At stage I, rubber, a filler, a softener, a modifier, an antioxidant, zinc oxide, a dispersant are introduced into the rubber mixer; in stage II - a mixture of stage I, a vulcanizing group.

The duration of mixing with the upper shutter lowered is 180 s in stage I and 90 s in stage I.

Vulcanization of the samples was carried out in an electric press at 155 ° C for 15 minutes.

The test results of rubber compounds and vulcanizates are shown in table 2.

Rubber compounds and vulcanizates are produced according to the known technology used in the rubber industry.

Tests of rubber compounds and vulcanizates are carried out by standard methods.

The aging of rubbers in a vapor-air medium is carried out according to the method No. IR-14ST-88 NY-IShP - in a medium of saturated water vapor (with a humidity of 100%) at atmospheric pressure, temperature 90 ° C for 4 days.

As follows from the data given in table 2, the introduction into the rubber mixture of polyester-3-hydroxyglycolic acid or un-decadiene diolane leads to an increase

5 conventional stresses at 300% elongation by 15-21%, bond strength of rubber with brass-plated steel cord by 15-26%, its resistance to aging in a vapor-air environment by 1.8-1.9 times and with combined

0 exposure to elevated temperatures, humidity and salt by 60-70%.

Claims (1)

SUMMARY OF THE INVENTION A rubber mixture based on a carbochain unsaturated rubber, including 5 sulfuric vulcanizing group, zinc oxide, filler, emollient, modifier, antioxidant and dispersant, characterized in that, in order to increase the conditional stress at 300% elongation, the bond strength of rubber with brass-coated steel cord and its stability aging in a steam-air medium and under the action of a NaCI solution at elevated temperatures, rubber death as 5 dispersant contains undecadienediolone of the General formula thirty CH3tCH CH-CH-CH2-C-CH2-CH he -si. OH., About i2 -CH CH-CH3 or polyester 3-oxyglycolic acid 35 of the formula  1 sn, sn sn cng c p about about I where n is 4-8, in the following ratio of components of the rubber compound, May. hours: KarbotseMany unsaturated rubber. 100 Chamois vulcanizing group 3-6 Zinc oxide 4.5-10.0 Filler 50-80 M softener 3-10 Modifier 0.5-5.0 Antioxidant 0.5-3.5 Dispersant - undecadienediolone or polyester 3-hydroxyglyc- acid 1-4 Table 1 The composition of the rubber compounds Properties of vulcanizates table 2