The rubber mixture

 

(57) Abstract:

Use: manufacture of tires and rubber products for various purposes. The inventive rubber mixture contains, by weight.h.: chloroticus 100, stearic acid 2,5 - 3,5, sulfur 1,8 - 2,2, tetramethylthiuramdisulphide 1,1 - 1,5, carbon black with a specific geometric surface 90 to 110 m2/g 40 - 60, molybdenum disulfide 7 - 20 2-mercaptoimidazole of 0.5 - 0.8. Characteristics of rubber: tensile strength 18,3 - 21,6 MPa, modulus at 100% elongation of 2.4 to 3.5 MPa, elongation 500 - 600%, a residual elongation of 10 to 16%, the hardness of 65 - 70% of the shore And the resistance to repeated tension at =0,4 p 885 - 970 thousand cycles; after aging (125C, 5 days) the tensile strength 79 - 88% of the original elongation 93 - 98% of the original. table 2.

The invention relates to obtain a rubber mixture based chlorobutyrate (KBC), the product of which may find wide application in the manufacture of tyres and General rubber goods (MRG) for various purposes.

Known rubber mixture based KBC, including stearic acid, sulfur, 2-mercaptobenzthiazole, tetramethylthiuramdisulphide, carbon black with a specific geometry is

However, the rubber of the known rubber compounds have insufficient resistance to repeated tension.

As described in the literature rubber mixtures based KBC, used for the manufacture of tires and rubber, the composition of the components closest to the present invention is a rubber mixture based KBC, including stearic acid, sulfur, 2-mercaptobenzthiazole, tetramethylthiuramdisulphide, carbon black with a specific geometric surface 90-110 m2/g and cadmium sulfide, for example in the ratio, by weight.h.: 100:3:2:0,65:1,3:50:10.

However, rubber from a rubber mixture (prototype) have insufficient resistance to repeated tension.

The purpose of the invention is the increased resistance to repeated tension rubbers of this mixture.

This objective is achieved in that the rubber mixture based chlorobutyrate, including stearic acid, sulfur, tetramethylthiuram, carbon black with a specific geometric surface 90-110 m2/g, the sulfide of the metal and the organic compound with mercaptopropyl, as metal sulfide contains molybdenum disulfide and as organic compounds with mercaptopropyl - 2-BR> Tetramethylthiuram - disulfide 1,1-1,5

Carbon black

with a specific geometry-

standard surface 90-110 m2/g 40-60 molybdenum Disulfide 7-20 2-Mercaptoimidazole 0,5-0,8

Characteristic components of rubber compounds.

Chloroticus (KBC, THE 38.403.54-80): a combined chlorine content of 1.2%, antioxidant 0.15 percent volatile at 105aboutWith no more than 0.3%, moisture not more than 0,25% , ash not more than 0.35%; Mooney viscosity at 100aboutWith 55-65 srvc.ed., the density of 920 kg/m3.

Stearic acid (GOST 6484-64): pour point 53-58aboutWith a density of 960 kg/m3.

Sulfur (GOST 127-76): basic substance content not less than 99,5%, water not more than 0.5%, manganese not more than 0.001%, copper not more than 0.001%, ash not more than 0.2%; melting point 114aboutC.

2-Mercaptobenzthiazole (GOST 739-74): the content of the basic substance at least 95%, water not more than 0.5%, ash not more than 0.2%; the remainder sifting sieve N C not more than 0.15%, a melting point of not more than 174aboutWith a density of 1500 kg/m3.

Tetramethylthiuramdisulphide (GOST 740-76): basic substance content not less than 98%, water not more than 0.5%, ash not more than 0.3%; the remainder sifting sieve N C not more than 0.15%, the melting point of 140-145about2/g, pH of the aqueous suspension of 3,7-4,5, weight loss at 105aboutWith not more than 1.5% ash not more than 0.05%, the balance sifting sieve N C not more than 0,004%, the density of 1800 kg/m3.

The cadmium sulfide (TU 6-09-3750-84): the content of the basic substance 98-99%, moisture of 0.1-0.3%; melting point 1475aboutWith a density of 4800 kg/m3.

Molybdenum disulfide (TU 48-19-133-85): the content of the basic substance 98-99% , moisture not more than 0.1%, the balance sifting sieve N C not more than 0.01%, the melting temperature of 1185aboutWith a density of 4800 kg/m3.

2-Mercaptoimidazole (2-MI, TU 6-14-261-78): the content of 2-MI 98-99,5%, moisture of 0.1-0.4%, the remainder sifting sieve N C not more than 0.15%, melting point 194-196aboutWith a density of 1430 kg/m3.

The composition of the rubber compounds and properties of rubbers of them obtained under optimal conditions (vulcanization at 153aboutC for 60 min), are given in table.1 and 2.

As seen from the above table.2 data, introduction to rubber mixture prototype 1 of molybdenum disulfide and 2-MI instead used in this known mixture N 1 cadmium sulfide and 2-mercaptobenzthiazole can significantly improve the resistance to repeated tension rubber from experimental data of rubber compounds (8-8,8 RA is rotation N 1. The optimal dosage of molybdenum disulfide 7-20 wt.h., 2 MI from 0.5 to 0.8 wt.h. on 100 wt.h. the rubber. Further increase in the dosage of these and other ingredients experienced rubber compounds more than the maximum optimum dosages of their much lower (worsens) the resistance to repeated tension rubber from this mixture (table.2, experimental control rubber in the recipe N 8 in comparison with experimental rubber N 6). At the dosage of these ingredients experienced rubber mixtures below the minimum optimal dosage does not allow them to achieve the objectives of the invention: all physico-mechanical properties of such rubber is much worse properties even rubber-prototype No. 1 or the same with them (PL.2, experimental control rubber in the recipe N 7 in comparison with experimental rubber in the recipe N 5 and rubber-prototype # 1).

The RUBBER MIXTURE based chlorobutyrate, including stearic acid, sulfur, tetramethylthiuramdisulphide, carbon black with a specific geometric surface 90 to 110 m2/g, the sulfide of the metal and the organic compound with mercaptopropyl, characterized in that, to increase resistance to repeated tension rubbers of this mixture, it is as metal sulfide contains desloatadine components, wt.h.:

Herbalicious - 100

Stearic acid is 2.5 - 3.5

Sulfur - 1,8 - 2,2

Tetramethylthiuramdisulphide - 1,1 - 1,5

Carbon black with a specific geometric surface 90 to 110 m2/g - 40 - 60

Molybdenum disulfide - 7 - 20

2-Mercaptoimidazole - 0,5 - 0,8

 

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