SU1763455A1 - Rubber mixture on the basis of butadiene-methylstyrene rubber - Google Patents

Abstract

Use: manufacture of rubber-cord mixtures. The essence of the invention: the rubber mixture contains, wt.h .: butadiene-methyl styrene rubber 100, sulfur 1-3.75, di- (2-benzthiazolyl) disulfide 0.5-2.5, zinc oxide 3-5, stearic acid 1-2, N-phenyl-M-isopropyl-p-phenylene diamine 0.5-1.25, technical carbon with a specific geometric surface of 96-105 m2 / g 25-60 and a modifying additive - tetrahydroindene di-poxide 1-1 ,five. The introduction of tetrahydroinden diepoxide into the rubber mixture provides an increase in the bond strength of rubber with a soaked nylon cord and brass-plated metal cord, as well as an increase in rubber fatigue endurance during repeated stretching. Offered as a modifying additive tetrahydroindene dioxide is obtained by epoxidation of tetrahydroindene with an aqueous solution of peracetic acid. 2 tab. (Ls

Description

The invention relates to the rubber industry, in particular, to the development of a rubber compounding for the manufacture of rubber and rubber cord products operating under conditions of elevated temperatures and dynamic loads.

Known polymer composition based on unsaturated rubbers and dicyclopentadiene dioxide modifier in an amount of 0.5-2.0 wt.h. on 100 ma.ch. rubber

(one).

However, the rubbers from this composition have low adhesiveness in rubber cord systems, low strength after aging.

The purpose of the invention is to increase the bonding strength of rubber with a soaked nylon cord and brass-plated metal cord, increasing fatigue endurance of rubber with repeated stretching.

This goal is achieved due to the use in the rubber mixture as a modifying additive of a heterocyclic diepoxide compound — a diepoxide tetrahydroindene of the general formula

vi

ON CJ

4 SP

ate

Offered as a modifying additive tetrahydroindene dioxide is obtained by epoxidation of tetrahydroindene (THI) with an aqueous solution of peracetic acid (NAA) (2).

T)

0+

+

Tetrahydroindene is a byproduct of the diene synthesis of cyclopentadiene with butadiene.

The structure of the compound is confirmed by the data of IR-NMR spectra, as well as by thin-layer and gas-liquid chromatography methods.

Tetrahydroindene dioxide has a molecular weight of 152 and an epoxy number of 55.26%. The compound is liquid, well miscible with rubber on conventional equipment. Rubber compounds have good technological properties.

Rubber mixtures are made in a laboratory rubber mixer with a mixing volume of 2 liters at a temperature of 150 ° C. The modifying additive is introduced at the beginning of the mixing cycle. The mixing time is 6 minutes. Sulfur and accelerators are introduced into the second stage into a rubber mixer at a temperature of 105 ° C. The mixing time is 3 minutes. Rubber mixtures are vulcanized in electric pressure at 143 ± 2 ° C for 30 minutes. Tests are carried out according to standard Methods.

Formulation of rubber mixtures are given in table 1. The properties of rubbers are given in table. 2

The rubber mixture is technologically advanced, does not stick to the equipment and is not prone to scorch. At the same time, the rubber composition is more economical, since it makes it possible to exclude rosin from the recipe. At the same time, the introduction of tetrahydroindene diepoxide into the rubber mixture will make it possible to expand the range of modifying additives for

40

rubber industry. The use of this additive in the recipe for the production of frame mixture will reduce the percentage of failure of reinforced products, as well as tires due to the separation of the frame during vulcanization and during the operation of products.

Claims (1)

The invention of a rubber mixture based on butadiene methyl styrene rubber, comprising sulfur, di (2-benzthiazolyl) disulfide, zinc oxide, stearic acid, 1 1-phenyl-1-isopropyl-p-phenylenediamine, carbon black with geometric specific a surface of 96-105 m2 / g and a modifying additive is a heterocyclic diepoxide compound, characterized in that, in order to increase the bond strength of rubber with impregnated nylon cord and brass-plated metal cord, increase rubber fatigue endurance during repeated stretching and, the mixture contains, as a heterocyclic diepoxide compound, a diepoxide tetrahydroindene of the formula in the following ratio of components ma.ch .: butadiene methyl styrene rubber. 100 sulfur1.0-3.75 di- (2-benzthiazolyl) -disulfide 0.5-2.5 zinc oxide3-5 stearic acid 1-2 M-phenyl-N-isopropyl-p-phenylenediamine 0.5-1.25 technical carbon with a specific geometric surface. Tew 96-105 m2 / g25-60 tetrahydroindene diepoxide modifying agent1, 0-1.5