SU1680725A1 - Rubber mixture - Google Patents

Abstract

The invention relates to the field of rubber and tire industry for improving the ductility, cohesive strength of a mixture, conditional stress at elongation, conditional strength at stretching, elasticity, fatigue endurance during repeated stretching and reduction of abrasion of vulcanizates while maintaining relative elongation at break, hardness and resistance tear, the rubber mixture contains a terpenemoleic resin with an acid number of at least 290 mg KOH per 1 g of the product, the softening temperature is not the same 60 ° C, mass fraction of non-combustible substances not more than 4% by weight. Rubber compounding formulation, mass: combination of general purpose synthetic rubbers 100.0; sulfur 0.7-2.0; N-cyclohexylbenzothiazole sulfenamide-2 0.7-1.7; zinc oxide 4.0-6.0; stearic or oleic acid, or a combination thereof, in a mass ratio of 1: 1 1.0-4.0; scorch retarders 0.5-1.5; carbon black 50.0-60.0; emulsions 11.0-14.0; antioxidants 3.0–6.0; protective wax 1.0-2.0; terpenomaleinovym resin 0.5-1.5, 2 scoreboard WITH with

Description

FIELD OF THE INVENTION The invention relates to the rubber and tire industries, in particular, to the development of a rubber compound based on general purpose synthetic rubbers.

The purpose of the invention is to improve the plasticity, cohesive strength of the mixture of conditional stress during elongation, conditional tensile strength, elasticity, fatigue endurance during repeated stretching and reduction of volatility |

while maintaining elongation at break, hardness and

tear resistance „

According to the invention, in a rubber compound based on general purpose synthetic rubbers, a terpenemaleic resin with an acid number of not less than 90 mg KOH per 1 g of product, softening temperature not lower than 60 ° C, mass fraction of unwashed substances not more than 4 is used.

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The rubber mixture is prepared in a laboratory rubber mixer at a temperature of 95-143 ° C for 4 minutes, the ingredients of the vulcanizing group are introduced on the Rolls after the mixture is cooled, the Time of mixture processing on the rolls is 6 minutes at a Temperature of 95 ° C

The curing of the samples is carried out at a temperature of 143 ° C for 30 min.

 The compositions of rubber mixtures are given in Table „1 o

The ductility of rubber compounds, cohesive strength, conditional tensile strength, elasticity, fatigue endurance after repeated stretching, abrasion resistance, are determined.

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The properties of rubber compounds and vulcanizates are given in table “20

Claims (1)

Invention Formula A rubber mixture based on a general-purpose combination of synthetic rubbers, including sulfur, Nr-cyclohexylbenzothiazole sulphenamide-2, zinc oxide, stearic or oleic acid, or a combination of them in a 1: 1 mass ratio, suspension inhibitor, carbon black, anti-oxidants, protective wax and softeners, characterized in that, in order to increase ductility, five five 0 cohesive strength of the mixture; conditional stress at elongation, conditional tensile strength, elasticity, fatigue endurance during repeated stretching and a decrease in the abrasion of vulcanizates while maintaining relative elongation at break, tear resistance and hardness, the rubber mixture additionally contains a terpene-maleic resin with an acid number of not less than 290 mg KOH per 1 g of the product, softening temperature not lower than 60 ° C, mass fraction of unwashed substances not more than 4% by weight in the following ratio of components, wt / h: Combination of synthesis General Purpose Ethical Rubbers 100 Sulfur 0.7-2.0 N-Cyclohexylbenzothiazole sulfenamide-2 0.7-1.7 Zinc oxide 4.0-6.0 Stearic acid or oleic acid, or a combination of these in a weight ratio of 1: 1 1 –4 Substripping retarder 0.5–1.5 Technical carbon 50–60 M emulsifiers 11–14 Antioxidants 3–6 Protective wax 1-2 Terpenomaleic resin 0.5–1.5 Table 1 Cis-1,4-poly-isoprene rubber SKI-3 Butadiene rubber SKD Butadiene-metal-styrene rubber SKMO ZOARKM15 Sulfur N-Cycle to silbeneothiazole sulfenamide-2 Zinc oxide 50.0 50.0 50.0 50.0 50.0 50.0 50.0 50.0 50.0 30.0 50.0 30.0 50.0 30.0 50.0 30.0 1.0 1.0 5.0 20.0 1.0 1.0 5.0 about,; 6.0 20.0 1.0 1.0 5.0 2.0 1.7 4.0 20.0 2.0 1.7 4.0 0.5 0.6 6.5 20.0 2.2 1.8 3.5 2.0 1.7 4.0 20.0 2.0 1.7 4.0 0.5 0.6 6.5 20.0 2.2 1.8 3.5 Continuation of table 1 table 2