The rubber mixture

 

(57) Abstract:

Use: manufacture of tires and rubber products for various purposes. The inventive rubber mixture contains, including: herbalicious 100, stearic acid 2,5 - 3,5; sulfur 1.8 - to 2.2; tetramethylthiuramdisulphide 1,1 - 1,5; carbon black with a specific geometric surface 90-110 m2/h 40 - 60; sulphide of barium 7 - 15; 2-mercaptoimidazole of 0.5 - 0.8 and natural zeolite 3 - 15. The viscosity of the rubber compound Mooney at 120C 62 - 74 srvc.ed., time podocarpaceae 60 - 90 minutes Feature rubber: conditional tensile strength of 21.7 - 23,7 MPa, elongation 470 - 525%, hardness 58 - 63 units shore a resistance to repeated tension 1150 - 1370 thousand cycles. After aging (125C, 5 days) : tensile strength 83 - 91% of the original elongation 95 - 99% of the original, the onset temperature of decomposition 287 - 303C, the change in mass of the rubber swelling,% glacial acetic acid (20C, 10 days) 0,4 - 2,0, a 10% oxalic acid (100C 30 days.) 4,0 - 6,2, in concentrated hydrochloric acid (20C, 60 d) 0.5 to 1.2. table 2.

The invention relates to the production of rubber mixtures based chlorobutyrate (KBC), the product of which may find wide application of the round rubber mixtures based KBC, used for the manufacture of tyres 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 (wt.h.) 100:3:2:0,65:1,3:50:10.

However, the known compound (prototype) has a high viscosity and poor resistance to podocarpaceae, and rubber from her lack of resistance to repeated tension, heat resistance and chemical resistance.

The purpose of the invention is the viscosity decreases, increasing the resistance of rubber to podocarpaceae, resistance to repeated tension, heat resistance and chemical resistance of rubber from the mixture.

This objective is achieved in that the rubber mixture based chlorobutyrate, including stearic acid, sulfur, tetramethylthiuramdisulphide, carbon black with a specific geometric surface 90-110 m2/g and a sulfide of a metal, as a metal sulfide, contains sulphide of barium and optionally contains 2-mercaptoimidazole and natural zeolite on the next sooto to 1.5 carbon black with a specific geometry of standard surface 90-110 m2/g 40-60 Sulfide barium 7-15 2-Mercaptoimidazole 0,5-0,8 Natural zeolite 3-15

Characteristics of the components of the rubber composition.

Chloroticus (KBC, THE 38-403-54-80): 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. unit ; a 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%; so pl. 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%, so pl. no 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%; so pl. 140-145aboutWith a density of 1290-1400 kg/m3.

Carbon black (354, GOST 7885-86): specific geometric surface 90-110 m2/g, pH of the aqueous suspension of 3,7-4,5,04%, 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%, so pl. 1475aboutWith a density of 4800 kg/m3.

The barium sulfide (TU 6-09-3961-75): the content of the basic substance 98-99%, moisture of 0.1-0.3%; so more than 1200 squareaboutWith a density of 4250 kg/m3.

2-Mercaptoimidazole (2-MI; THE 6-14-261-78): the content of 2-MI 98-99,5%, moisture of 0.1-0.4% ; the remainder sifting sieve N C 0,10-0,15%; so pl. 194-196aboutC; density 1430 kg/m3.

Natural zeolite (TU 113-23-91-05-90): the content of the basic substance is not less than 90%, of water and volatile matter not more than 2.0%; pH of aqueous extract of 6.5 to 8.5; the remainder sifting sieve N 0063 not more than 0.3%; density 2000-2300 kg/m3.

For the manufacture of rubber compounds used digidrirovanny natural zeolite (heated at 400-450aboutC for 1-2 h).

The composition and properties of rubber compounds and rubber from them, obtained under optimal conditions, are given in table. 1 and 2.

As seen from the above table. 2 data, introduction to rubber mixture prototype 1 of sulphide of barium instead used in this known 1 mixture of cadmium sulfide and optionally applying a 2-MI (instead of 2-mercaptobenzthiazole) and natural zeolite reduces the bitterness (10.5-12.5 times), the temperature - increasing the temperature of the beginning of decomposition of experienced rubbers on 12-28aboutC and a decrease of the maximum decomposition rates of 1.2-1.5,- (parameters found experimentally by the method of integral and differential dynamic thermogravimetry in air at 20-800aboutC and heating rate of 10aboutC/min on the device derivatograph for thermal analysis of polymeric and other materials with the temperature measurement accuracy of 0.5aboutAnd speed of weight loss throughout the temperature range 20-800aboutWith, including the stage of decomposition of rubber, 0.1 abs.%), and to improve chemical resistance of rubber from the data experienced rubber mixtures (1.6-15 times) with much smaller (1.5-2.5 times) the optimal time of vulcanization experienced rubber mixes and the best level of physical and mechanical properties of these experienced rubbers 2-6, compared with rubber-prototype 1 (PL. 2, experimental rubber compound and rubber 2-6, in comparison with the rubber mixture of the prototype and rubber-prototype 1). The optimal dosage of sulphide of barium 7-15 wt. o'clock, 2 MI from 0.5 to 0.8 wt.h. and natural zeolite 3-15 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 optimal dose the and chemical resistance of rubber from the experimental rubber compound, greatly reducing the resistance to repeated tension rubbers with the same optimal time of vulcanization experienced mix and level of physical and mechanical properties of rubber (table. 2, experimental control mixture and rubber 8, in comparison with the experimental mixture and rubber 6). Reducing the dosage of all these ingredients experienced rubber mixtures below the minimum optimal dosage does not allow them to achieve the objectives of the invention of this application: all properties of such mixtures and rubber (excl. resistance of the mixture to podocarpaceae) much worse properties experienced a mixture of rubber and 5, and by most measures properties - even worse mixtures and rubber-prototype 1 or identical with it (PL. 2, experimental control mixture and rubber 7, in comparison with the experimental mixture and rubber 5, and mixture and rubber-prototype 1).

The RUBBER MIXTURE based chlorobutyrate, including stearic acid, sulfur, tetramethylthiuramdisulphide, carbon black with a specific geometric surface 90-110 m2/g and a sulfide of a metal, characterized in that, in order to reduce viscosity, increase the resistance of the rubber to podocarpaceae, resistance to repeated tension, heat resistance and chemical resistance of rubbers of this CME is eolit in the following ratio of components, wt.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

Sulphide of barium 7 - 15

2-Mercaptoimidazole 0,5 - 0,8

Natural zeolite 3 - 15

 

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