SU1508555A1 - Friction composition - Google Patents

Abstract

The invention relates to the development of a formulation of an asbestosofricon composition intended for the manufacture of brake linings operating in brake nodes of a drum; (Car type of the invention The invention allows to increase the wear resistance of the material of this composition from 0.78-10 to 1.7-10 J / cm.sm.p. To increase the stability of the braking effect at elevated temperature by using the composition in the formulation, including May.%: butadiene branched rubber with a 1,2-unit content of not less than 70 May.% 7-10; sulfur 0.2-1.5; vulcanizing accelerator 0.05-0.2; zinc oxide 0 , 5-5 and asbestos 30-45,3, butadiene nitrile rubber with a content of acrylic acid nitrile 27 - 30 wt.%, 7-10 wt.% Apatite concentrate May 2-10 atm% barite concentrate 11,5-32% by weight, chalk 2 -.. 9 mass% and alumina of 4-10 wt% .; Table 2...

Description

The invention relates to the development of a formulation of an asbestos-friction composition intended for the manufacture of brake linings, exploited in drum-type brake assemblies of passenger cars.

The aim of the invention is to improve the wear resistance of the material of this composition and to increase the stability of the braking efficiency at a higher temperature.

The composite is prepared in a dry or combined manner with the use of gasoline solvent in mixers of various designs. The discharged mixture is crushed in a disintegrator (the mixture with the solvent is dried before grinding), briquetted, vulcanized in a mold at 185–200 s, the specific pressure is not less than 35 t-SchA. „

for 12 minutes, then subjected to additional heat treatment at t80–220 ° C for 4–6 h.

Formulations KONmosH ifi are given in table. one..

Evaluation of wear resistance to brake efficiency was carried out on a full-scale stand in the rear drum brake of the Moskvich-2141 car using the bench test method of brake linings of Moskvich R IS-0091 automobiles under the following conditions, tests:

- braking efficiency in the cold state is determined when braking from the initial speed of 80 km / h to a stop, at the initial temperature and pressure in the drive of 4 MPa;

OVD

one

Q1

- braking efficiency at elevated temperatures is determined in braking mode with an initial speed of 120 km / h before stopping in the process of determining the efficiency loss during heating to temperature and pressure in the drive A MPa;

-wear resistance is determined in a braking mode from an initial speed of 120 km / h to a final speed of 60 km / h, a drive pressure of 3 MPa, an end temperature of not more than, specific work 536.9 J / cm.

The test results are given in Table. 2

The material of this composition is characterized by the coefficient of friction, determined on an I-32 machine for cast iron SCh 15 (GOST 1412-85), from 0.4–0.6 and specific impact work (9.0– 21.3 kJ / m2).

Claims (1)

Invention Formula Composition of friction designation, including butadiene branched rubber with a content of 1.2-stars — not less than 70 vol.%, Sulfur, vulcanization accelerator, zinc oxide and five 0 five 0 asbestos, characterized in that, in order to increase the durability of the material of this composite and the stability of the braking efficiency at a higher temperature, the composite also contains nitrile-butadiene rubber with an acrylic acid nitrile content of 27-30 wt.%, apatite concentrate, barite concentrate, chalk and g; L nozem in the following ratio of components, May. % :, Butadiene branched rubber containing 1,2-star at least 70 May. % 7-10 nitrile butadiene rubber containing acrylic acid nitrile 27-30 May, 7-10% Sulfur0.2-1.5 Vulcanization accelerator .0.05-0.2 Zinc oxide6.5-5.0 Apatite concentrate 2-10 Barite concentrate 11.5-32 Mel2-9 Alumina 4-10 Asbestos Else T a b l and c a G Butadiene rubber1 is branched with a 1,2-link content of less than 70 May. % (SKDSR): / content of 1,2-units 85% 16.2 content G, 2-. links 70% -. Butadiene nitrile rubber; SKO-26N - ekI-26ASMsera2, 5 2-Me1 captobenzthiazole 0,2 Di- (2-benzthiazolyl) - disulfide Tetramethylthiuram-D11 sulfide0,1 Zinc Oxide4.0 Concentrate barite iron minium 29.0 17.12 8.56 8.56 8.56 - ----. 10.0 9,5 8,56 7.0 0.8 .8.56 8.56 8.6 10.0 .i 2.56, 0.8 0.17 0.2 0.8 0.2 8.0 7.0 0.2 0.4 0.085 - 4.3 4.27 4.3 4.3 0.2 0.5 8.56 0.8 0.05 2, 0 5.0 4.3 20.55 20.55 25.95 31.25 11.5 22.0 32.0 20.55 16.27 9, 5 8.56 7.0 8.56 8.6 10.0 .i 0.8 0.2 0.8 0.2 8.0 7.0 0.2 0.4 8.56 0.8 0.2 0.5 0.05 2, 0 5.0 4.3 Apatite chalk concentrate Alumina Asbestos 48.0 5,4 - - 5,42,09,0 10,0 5,4. 5.4 - 5.4 -9.08.0 2.0 5.4 5.4 - 5.4 -10.09.0 4.0 5.0 40.83 in favor, 975 40.83 40.83 45,334,7530, Prevshechapii Compositions 1-4 control; formulations 5-8 proposed ,: eiko-mechanical indicators of sample compositions Indicator liaaecT . L.l2J. ± .I2.J Wear resistance. 10 J / cm ". With" mm 0.78 1.06 0.78 0.8 0.88 1.69 1.63 Efficiency tormozhesh1, m / s, at a temperature pressure of 5 MPa. speed 80 km / h 3.1 3.3 3.1 3.0 3.1 3.4 4.4 4.0 3.8 Average maximum deviation of the effectiveness of the brake. . wife when heated-, wah to 200 C, Z 14.0 17.0 14.0 15.0 16.0 8.0 6.0 7.0  Tg table 2 Composition.