Polymer friction materials

 

(57) Abstract:

Use: manufacture of brake devices of vehicles. The essence of the invention: composition includes, by weight. %: diphenylpropylamine rezol resin - 12 - 16, on BNR rubber - 3, fibrous fillers - 30 - 50, a mixture of granular friction fillers - the rest. The material is produced by hot pressing. The average value of KTr= 0,35 - 0,4 when worn up 2,810-13m3/J. table 2.

The invention relates to the production of polymeric friction material and can be used for the manufacture of brake devices of vehicles.

Known friction polymer composition containing as a binder phenol-formaldehyde resin, fibrous and granular fillers, of the following composition, wt.

Phenol-formaldehyde resin 12 16

Asbestos 30 50

On BNR rubber 2 4

The mixture friction fillers 29 46

Phthalocyanine copper 0,5 3

The disadvantage of this composition is the low stability of the coefficient of friction in the process of changing temperature on the friction surfaces. The coefficient Tr is about, falls to 0.12, which is caused by the release of phenol and other decomposition products of the binder in the role of lubrication. During operation of the friction materials in brake nodes, this leads to uneven deceleration of the vehicle, increased wear of the material and environmental pollution phenol and other toxic products.

Known friction polymer composition with a reduced content of phenol, in which the last part is substituted for aniline, wt.

Phenomenologicaldoctrina resin 13 15

Nitrile rubber 2 4

Asbestos 30 45

Friction fillers Rest

Use malefemale resins allows to stabilize the friction coefficient whose value in the temperature range of 350 450oWith decreases to 0.15 to 0.18. Thus the wear resistance of the composition deteriorates. In addition to eliminate completely environmentally harmful emissions during operation of the friction material is not possible.

The stability of the friction coefficient, wear resistance of the composite material and the reduction of harmful emissions in the process of its manufacture and operation is achieved by using as thermoeter polimernoi friction composition, wt.

Diphenylpropylamine resin 12 16

Nitrile rubber 3

Fibrous fillers 30 50

The mixture of granular friction fillers Rest.

As fibrous fillers can be used asbestos mineral, polymer, carbon, metal fibers. As the granular filler barite, limestone, graphite, powders of metals and their oxides.

Press composition produced by mixing the above ingredients in a mixer under a pressure of 0.5 to 0.6 MPa for 10 minutes Friction polymeric material from this picscomposition made by hot pressing at 1755oC and a pressure of 100 MPa at a speed in the mold for 1 min per 1 mm thickness of the product. The compositions of several variants of the proposed friction material are given in table. 1.

Tribological characteristics of known and proposed composite materials was evaluated on the machine friction CMT-1 by the method. The technique of simulated operation of the friction material in the disk brake of the vehicle is operated in the range of from 20 to 500oC. It is possible to obtain an objective comparative characteristics of materials of different Planta friction, calculated in the whole area of working temperatures, energetic wear, and a coefficient of stability of the friction coefficient. The coefficient of stability of the friction coefficient was estimated as the ratio of the mean to the maximum value during the test period. These tribological characteristics are presented in table. 2.

The bonding strength of the brake pads with a metal frame made of Art. 20, was estimated by the method presented in THE 38-114-187-86.

The content of the phenol produced during the friction was evaluated during the friction test by selecting gaseous products directly from the zone of friction. Gaseous products were passed through a solution of the reagent reacts with phenol and changing its optical density. The quantitative content of the phenol was evaluated by the change in optical density of the reagent in accordance with the methodology. The results obtained are also presented in table. 2.

Analysis of the obtained data showed that the composition provides an average value of the friction coefficient at the required level 0,35 0,4 meets the compounds 1, 2, 3, and the wear of the material of this composition does not exceed an acceptable level 2,810-13m3/Desnos above an acceptable level, and with more than 16 binder is characterized by the average value of the friction coefficient is below an acceptable level. The stability of the coefficient of friction of compounds 1, 2, 3 higher stability of the friction coefficient on the well-known prototype 1.3 times. The friction coefficient in the temperature range of 350-450oWith reduced no more than to 0.25. The bonding strength of the friction material with a metal frame at the proposed composition is higher than in the known, and the allocation of phenol in the process of testing is not found.

Thus, the proposed composition than the known stability of the friction coefficient, wear resistance. There is no release of toxic phenol. This result was due to replacement of the binder included in the friction material on environmentally friendly thermosetting resin rezol type, with, apparently, more durable and frequent mesh structure. The use of the proposed friction polymer compositions in the manufacture of brake pads car will improve their consumer characteristics, increase life expectancy and reduce harmful environmental impacts of transport on the environment.

Polymermetal, the mixture of granular friction fillers, wherein as thermosetting resin it contains diphenylacetaldehyde rezol resin in the following ratio, wt.

Diphenylpropylamine rezol resin 12 16

On BNR rubber 3

Fibrous fillers 30 50

The mixture of granular friction fillers Ostalnoe

 

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