SU1099593A1 - Polymeric composition for obtaining friction materials - Google Patents

Abstract

POLYMER COMPOSITION FOR OBTAINING FRICTIONAL MATERIALS, including a copolymer of butadiene with divinylbenzene. phenol-formaldehyde resin, sulfur, 2-mercaptobenzthiazole, thiuram, plasticizer-polydiene or aromatic oil, asbestos and filler, in order to increase the mechanical strength while maintaining the high friction properties of rubber published of the composition, the latter contains iron oxide or barite as a filler and additionally calcium oxide hydrate with a ratio of the latter and sulfur of 0.12-0.39: 1, and the components of the composition are taken in the following ratio, wt%: Buffiene copolymer with vinylbenzene15-17 Phenol form aldehyde resin2.5-3.5 2-Mercaptobenzthiazole 0.15-0.16 Thiuram0.07-0.08 Sulfur2.48-2.6. Polydiene or aromatic oil 0.4-1.2 Asbestos45-47 Calcium hydroxide in a ratio with sulfur 0.12-0.39: 10.3-1.0. Barite or iron redEstal

Description

The invention relates to friction products, in particular to friction elements for drum brakes of motor vehicles.

Known polymer composition to obtain friction materials, composition, wt.%:

Butadiene copolymer

sodium benzene 15,6

Phenol formaldehyde

resin2.92

Sulfur 2.48

2-Mercaptobenzthiazole 0.15

Thiuram0.07

Zinc Oxide3.83

Iron Minium27,85

Plasticizer polydien

ABOUT

or aromatic

you you ate

oil (PN-6) 0.47

Asbestos46,63

This polymer composition has insufficient mechanical strength.

The purpose of the invention is to increase the mechanical strength while maintaining the high frictional properties of rubber from this composition.

This goal is achieved in that the polymer composition for the preparation of friction materials, including a copolymer of butadiene with divinylbenzene, phenol formaldehyde smol, sulfur, 2-mercaptobenzthiazole, thiuram, plasticizer-polydiene, or aromatic oil.

asbestos and filler contain iron oxide or barite as a filler and additionally calcium oxide hydrate with a ratio of the latter and sulfur of 0.120, 39: 1, and the components of the composition are taken in the following ratio, May. %: Butadiene copolymer with divinylbenzene 15-1; 7 Phenol-formaldehyde resin2.5-3.5

2-Mercaptobenzthiazole 0, .16 Thiuram 0.07-0.08

Sulfur 2.48-2.6

Polydienes or

aromatic oil .0,4-1,2

Asbestos45-47

Calcium oxide hydrate in a ratio

with sulfur 0.12-0,39: 10,3-1,0

Barite or

iron surika

P r and measures. The polymer composition is prepared in rubber seamer without the use of a solvent. The mixture is crushed on a disintegrator, then briquettes are prepared, followed by molding into hot molds. The coefficient of friction and wear of polymer compositions are determined on a laboratory friction machine 1 / 1-32.

Test conditions:

Unit pressure

for samples, kgf / cm 2,7 ± 0,2

Circle speed

on the middle line

samples, m / s 7,0-7,5

Temperature, ° С100-120

Linear wear (in mm) is determined on samples tested for the coefficient of friction on the friction machine. The tensile strength is determined according to GOST 11262-76, the shear strength at shear is according to GOST 17302-71, and the compressive strength is according to GOST 4651-78.

Compositions; compositions are presented in table. U, test results - in table 2.

The results of testing rubber from the proposed polymer composition showed that in terms of the coefficient of friction, linear wear, they are on the same level as rubber from a known composition, and surpass them in mechanical strength by 20-30%.

The use of calcium oxide hydrate excludes the use of expensive and scarce raw material - zinc oxide.

Table 1

Table 2

Strength at NII, kgf / s

Strength at

kgf / cm

Strength at

kgf / cm

Brinell kgf / im hardness

Friction coefficient

Linear wear, mm

259270

275

290

510585 608 kzk

1150 For

ues

11 (90

22

nineteen

21

21

. 0.111

0,

0, l (t

0, 0.13

0.11

0.10

0.10

Claims (2)

POLYMERIC COMPOSITION FOR PRODUCING FRICTIONAL MATERIALS, including a copolymer of butadiene with a divine or polyamide, phenol formaldehyde resin, sulfur. 2-mercaptobenzthiazole, thiuram, plasticizer-polydiene or aromatic oil, asbestos and filler, which is because of the fact that. in order to increase the mechanical strength while maintaining the high frictional properties of the rubbers of the published composition, the latter contains iron minium or barite as a filler and additionally calcium oxide hydrate with a ratio of the latter and sulfur of 0.12-0.39: 1, and the components of the composition are taken in the following ratio , wt.%: Butadiene copolymer with divinylbenzene 15-17 Phenol formaldehyde resin 2.5-3.5 2-mercaptobenzthiazole 0.15-0.16 Tiuram 0.07-0.08 Sulfur 2.48-2.6. Polydiene or aromatic oil 0.4-1.2 Asbestos 45-47 Calcium oxide hydrate in relation to about with sulfur 0.12-0.39: 1 0.3-1.0 Joint venture Barite or iron minium Rest Cz about