RU2001055C1 - Friction purpose composition - Google Patents

Abstract

Use, asbofriction composition of DPG. The manufacture of brake linings operating in friction units of trucks asbestos 25–50, the condensation product of sulfonated phenol with formaldehyde in an acidic environment and / or the product of the combined condensation of sulfonated phenol and hydroquinone with formaldehyde 1–5, rests up to 100. The resulting material is characterized by reduced corrosion activity while maintaining high friction and physical and mechanical properties 2 tabl

Description

The invention relates to asbofriction compositions intended primarily for the manufacture of brake linings operating in friction assemblies of trucks.

A protective coating for friction linings is known comprising a cellulosic binder, a neutral and inert pigment, an anti-corrosion agent and a solvent.

A clutch (clutch plate and disc assembly) is also known in which the pads are impregnated with an anti-corrosion substance containing at least one compound that has a greater tendency to ionize than iron.

However, these compositions do not provide sufficient corrosion protection to the brake pads to which the linings are riveted.

Closest to the proposed one is a composition containing, by weight: Polybutadiene rubber 20 Sulfur 3,6 Vulcanization accelerator 0.4 Barite30 Graphite 2.62 Powder titanium 15.38 Copper powder 13.0 Asbestos 15.0 The disadvantage of this composition is that although it provides good friction pair wear resistance, however, its corrosion resistance is insufficient, especially during long-term storage of vehicles.

The aim of the invention is to reduce the corrosion activity of products while maintaining a level of wear resistance.

The goal is achieved in that the friction composition, including butadiene rubber, sulfur, a vulcanization accelerator, barite, graphite and asbestos, further comprises calcium stearate and a condensation product of sulfonated phenol with formaldehyde in an acidic environment and / or a product of the joint condensation of sulfonated phenol and hydroquinone with formaldehyde, in the following ratio of components, wt.%:

Butadiene rubber 15-20 Sulfur 0.2-4.0

Vulcanization accelerator0, 1-1.0 Graphite5-12 Calcium stearate 02-2.0 Condensation product of sulfonated

phenol with formaldehyde in an acidic environment and / or co-condensation product

sulfonated phenol

and hydroquinone with a formaldehyde guide1-5 Asbestos 20-50 Barite Else

as a condensation product of sulfonated phenol with formaldehyde, KU-1 cation exchanger, produced according to GOST 20298-74, is used.

Cation exchange resin has the following structure:

ONON HE

 1 СН2-1 СН2 СНг- S03HСН2S03H

As the product of the joint condensation of sulfonated phenol and hydroquinone with formaldehyde, an EO-7 electric exchanger manufactured in accordance with TU 6-05-1358-75 is used.

The electric exchanger has the following structure:

HE

sn2 sn

SO, H

S03h

The composition is prepared by mixing the components in a rubber mixer at a temperature of no more than 95 ° C, crushed in an OT-118 type disintegrator or other type of grinder, pressed into preform briquettes, which are then molded into products under the influence of temperature of 170-200 ° C and pressure 25- 50 MPa.

Examples of formulations of the proposed and known compositions are presented in table. 1.

Physicomechanical indices were determined on an I-32 friction machine under the following conditions: temperature 100-120 ° C, friction speed 7.0-7.5 m / s, specific load 27 N / cm. counterbody material is SCH-15 gray cast iron. Wear was determined over 2 hours of continuous friction with a constant friction moment of 11.6 N m.

Assessment of the corrosion activity of the brake pads was carried out according to GOST 1786-80 by holding the brake pads with

rivets on them in a climate chamber at a humidity of 100% according to the regime:

(48 + 2) ° С - 8 hours, (20 + 2) ° С - 16 hours. The test results are presented in table. 2.

The proposed composition has the following physical and mechanical properties: Tensile strength, MPa at shear 36.3-40,0

gap 23.0-25.0

compression 99.0-103.1

Specific impact strength.

kg cm / cm 22.97-3.50.

From the test results it follows that the use of the proposed composition makes it possible to significantly reduce the corrosion activity of products and at the same time maintain high friction-wear and physico-mechanical properties.

(56) Application of Germany N 2553142, cl. C 09 D 3/12, 1976.

UK Application No. 2105417. cl.

F 16 D 69/02, 1983.

USSR copyright certificate G 946250. cl. S 09 K 3/14, 1979.

NOTE pttWtyp YUMSTIO AND ..0 ". "T%

PaiyntTarw Tests

 The area of the liturgy of the jurisprudence of the region is according to GOST c. 311-87

Claims (1)

The claims COMPOSITION OF FRICTION PURPOSE, including butadiene rubber, sulfur, a vulcanization accelerator, barite, graphite and asbestos, characterized in that. in order to reduce the corrosion activity of products while maintaining the level of wear resistance, the composition additionally contains calcium stearate and a condensation product of sulfonated phenol with formaldehyde in an acidic environment and / or a product compatible with 61 and c Table fifty 55 continuous condensation of sulfonated phenol and hydroquinone with formaldehyde in the following ratio of components. wt.%: Butadiene rubber 15-20 Sulfur 0.2 - 4.0 Vulcanization accelerator 0.1-1.0 Graphite 5-12 Calcium Stearate 0.2 - 2.0 The condensation product of sulfonated phenol with the form of ice-dehydrate in an acidic medium and / or the product of the combined condensation of sulfonated phenol and hydroquinone with formaldehyde 1 - 5 Asbestos 20 - 50 Barite