RU1815269C - Rubber compound - Google Patents

Abstract

Usage: manufacturing of rubber products for various purposes. The inventive rubber mixture contains parts by weight of: a copolymer of zpichlorohydrin, ethylene oxide and 1,2 epoxyoctene-7,100; stearic acid v 0.8-1.2; sulfur 6.9-1.1, mercaptobenzthiazole 0.7-0.9; tetramethylthiuram disulfide 1.4-1.6; magnesium oxide 1.9-2.1; carbon black with a specific geometric surface of 75-82 m2 / g 45-55 and molybdenum disulfide 7-15. Mooney scorch time of rubber compounds at 120 ° C for 30-36 minutes. Rubber properties: conditional tensile strength 16.6-20.1 MPa, elongation at break 190-230%, relative residual deformation (compression 20%, air 100 ° C, 24 hours) 13-21%. after st. rhenium at 125 ° C for 5 days:% retention of strength from the original 92-100, relative elongation 86-95, at 150 ° C for 6 hours; % retention of strength 77-84, relative elongation of 75-86, decomposition onset temperature 241-262 ° C, resistance to liquid media at 20 ° C for 60 days: in oleic acid -% retention 81-95 , elongation 93-97, weight change 1.1-7.0%; in glacial acetic acid for 10 days -% retention of strength 65-87, relative elongation of 37-54, mass change 1.2-9%, in concentrated hydrochloric acid -% retention of strength 70-90, relative elongation of 28 -45, mass change of 1-7%, in water-% retention of strength 91-100, elongation 90-99, mass change of 6-10%. 2 tab. AND

Description

The invention relates to the production of a rubber mixture based on a copolymer of epichlorgiDrin, ethylene oxide and 1,2-epoxyoctene-7 (SKEHG-ST), the products of which can be widely used in the manufacture of rubber products (RTI) for various purposes.

The purpose of the invention is to increase the resistance of the rubber compound to vulcanization, strength, heat resistance, heat resistance, chemical resistance and reduce

relative residual deformation of rubbers from this mixture.

The goal is achieved in that the rubber mixture based on a copolymer of zpichlorohydrin, ethylene oxide and 1,2-epoxyoctene-7, including stearic acid, sulfur, 2-mercaptobenzthiazole, tetramethylthiuramdisulfide, magnesium oxide and carbon black with a specific geometric surface 75-82 m2 / g, additionally contains molybdenum disulfide at barely 00

with

N3 O H

the corresponding ratio of components, parts by weight: Copolymer of epichlorohydrin.Ethylene oxide and 1,2-epoxyoctene-7100 Stearic acid 0.8-1.2 Sulfur 0.9-1.1 2-Merkptobenzthiazole 0.7-0.9 Tetramethylthiuramdi - sulfide 1.4-1.6 Magnesium oxide 1.9-2.1 Carbon black with a specific geometric surface of 75-82 m2 / g - 45-55 Molybdenum disulfide 7-15. Characteristics of the components of rubber compounds.

A copolymer of epichlorohydrin, ethylene oxide and 1,2-epoxyoctene-7 (SKEHG-ST. TU 8.403.635 90): mass fraction of chlorine 20-5%, ash no more than 1.0%, unsaturation, 0-2.5%; weight loss at 105 ° C is not more than 1.0%, the Mooney viscosity at 100 ° C is 70-80 units, the flow rate is 1270 kg / m3.

Stearic acid (GOST 6484-64): solidification temperature 53-58 ° C, density 960 kg / m3.

Sulfur (GOST 127-76): the content of the main substance is 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 114 ° C.

2-Mercaptobenzthiazole (GOST 739-74): basic content of at least 95%, water not more than 0.5%, ash not more than 0.2%; the residue after sieving on sieve No. 014 K is not more than 0.15%, the melting temperature is not more than 174 ° C, the density is 1500 kg / m3,

Tetramethylthiuramdisulfide (GOST 740-76): the content of the main substance is not less than 98%, water not more than 0.5%, ash not more than 0.3%; the residue after sieving on sieve No. 014 K is not more than 0.15%, melting point 140-145 ° C, density 1290-1400 kg / m3.

Magnesium oxide (GOST 844-79): the content of the basic substance is not less than 90%, calcium oxide is not more than 2.5%, iron oxide is not more than 0.1%, weight loss during calcination is not more than 7.5%, the residue after sieving on a sieve No. 014K not more than 0.1%, melting point 2800 ° C, density 3130-3650 kg / m3.

Carbon black P 324 (GOST 7885-86): specific geometric surface 75-82 m2 / g, pH of the aqueous suspension 7-9, weight loss at 105 ° C not more than 0.5%, ash content not more than 0.3%, residue after sifting on sieve No. 014 K no more than 0.02%, density 1860 kg / m3.

Zinc oxide (GOST 202-84): the content of the basic substance is not less than 99.7%, lead oxide not more than 0.01%; weight loss during calcination not more than 0.2%, residue after

sifting on sieve No. 014 K 0%, melting point 1800 ° C, density 5470-5660 kg / m3.

Molybdenum disulfide (GU 4819-133-85): content of the main substance 98-99%,

0 moisture no more than 0.1%; the residue after sieving on sieve No. 014 K is not more than 0.01%, density 4800 kg / m3, melting point 1185 ° C. Rubber mixtures were prepared on laboratory rollers at a roll temperature of 205-30 ° C for 18-20 minutes. The vulcanization of the mixtures was carried out in an electric press at 150 ° C for 30 min (the first stage of vulcanization), followed by thermostating of the rubbers in a thermostat in air

0 at 150 ° C for 4 hours (second stage

vulcanization).,

The composition and properties of rubber compounds and

rubbers of them obtained in optimal

conditions (as indicated above) are given in

5 Tab. 1 and 2.

As can be seen from the table. 2 data, the introduction into the rubber mixture - prototype 1 of additional molybdenum disulfide instead of zinc oxide allows to increase the resistance of the rubber mixture to vulcanization by 5-6 times, strength by 20-44%, heat resistance by 1.5-1.9 times, heat resistance (increase in the temperature of the beginning of decomposition of experimental rubbers by 11-32 ° С and

5 reduction of the maximum decomposition rate by 2–3 times — the indices were found experimentally by the method of integral and differential dynamic thermogravimetry in air at 20–800 ° C

0 and a heating rate of 10 ° C / min on a derivatograph for thermal analysis of polymer and other materials with an accuracy of temperature measurement of ± 0.5 ° C and the rate of mass loss over the entire range

5 temperatures of 20-800 ° C, including the decomposition of rubber, 0.1 abs.%), Chemical resistance (by a change in weight - 1.4-50 times) and reduce the relative residual deformation (1.2-2.0 times) experienced rubbers from

0 of this mixture (table. 2, experimental rubber compounds and rubber 2-6 in comparison with the rubber mixture of the prototype and rubber prototype 1). The optimal dosage of molybdenum disulfide is 7-15 parts by weight. per 100 parts by weight rubber.

55 Experienced composition and properties are experienced rubber mixture and rubber 4. Experienced rubber 7 with a molybdenum disulfide content of less than 7 wt.h. (3 parts by weight) and the lower prohibitive dosage of all other ingredients (Table 1, mixture 7 in

Claims (1)

compared with the test mixture 5) does not yet have any advantages over the purpose of the invention over the rubber prototype 1: the properties of the experimental rubber 7 are even worse or equal to the same properties of the rubber prototype 1 (table. 2, experimental rubber 7 in comparison with rubber prototype 1 ) The experimental rubber composition and rubber 8 with a molybdenum disulfide content of more than 15 parts by weight (20 parts by weight) and the upper prohibitive dosage of all other ingredients (table. 1, mixture 8 in comparison with experimental mixture 6), the properties for the purpose of the invention are deteriorating or (relative residual deformation) no longer improving, remaining at the achieved level (table . 2, the experimental mixture and rubber 8 in comparison with the experimental mixture and rubber 6). The formula of the invention A rubber mixture based on a copolymer of epichlorohydrin, ethylene oxide and 1,2-epoxyeoctene-7, including stearic acid, sulfur, 2-mercaptobenzthiazole, tetramethylthiuram disulfide, magnesium oxide and carbon black with a specific geometric surface of 75-82 m2 / g, about t l and h a- In addition, in order to increase the resistance of the rubber compound to scorch, strength, heat resistance, heat resistance, chemical resistance and to reduce the relative residual deformation of the rubber from this mixture, it additionally contains molybdenum disulfide in the following ratio, wt.h. .: copolymer of epichlorohydrin, ethylene oxide and 1,2-epoxy-octene-7 stearic acid sulfur 2-mercaptobenzthiazole tetramethylthiuram disulfide magnesium oxide carbon black with a specific geometric surface of 75-82 m2 / g molybdenum disulfide jdf M0 (Ј 0.8-1.2 0.9-1.1 0.7-0.9 1.4-1.6 1.9-2.1 45-55 7-15 The composition of the rubber compounds Table 1 Puni podulcanization belt of rubber see cm at 12 ° C, Nin Systza rubber like tensile strength, Pa word stress at elongation, 100, NPa elongation at break, os,%. Hardness, unit Shore L Relative residual deformation (“. 2Gi, air, 100 ° С,. | H),% After aging: at 125 ° С, $ days tensile strength, J from the initial elongation,% of initial at 150 ° C, 6 h tensile strength,% of initial elongation,% of initial Decomposition start temperature, 0 С Maximum decomposition rate, from the original nass / min Resistance to liquid media at 20 ° C for 60 days; Oleic acid: Tensile strength,% of initial Elongation,% of the initial Mass changes, 3; Ice on acetic acid (10 days) Tensile strength,% of initial Elongation,% of the initial Change in MSSA,% Concentrated hydrochloric acid. Tensile strength,% RT of initial. . The relative elongation, t about - source Mass change,% Water Tensile strength,% of initial Elongation,% of the initial Changing the reaches, 5; Table Properties of rubber compounds and rubbers in optimum vulcanization 35 32 30 36 31 32 20