Composition for preparing friction material

FIELD: special compositions.

SUBSTANCE: invention relates to a method for preparing composition compounds based on phenolformaldehyde resins, in particular, friction materials for members of breaking device constructions. The composition for preparing friction material comprises the following components, wt.-%: butadiene nitrile rubber, 1-7; phenolformaldehyde resin, 11-25; copper powder, 7-9; barite, 17-19; carbon fiber, 11-13; graphite, 6-10; magnesium oxide, 1-3; diabase powder, 2-4, and basalt fiber, the balance. Invention provides enhancing friction properties of material resulting to optimization of effect the hydrogen wearing an reducing value of the material wear in its working in corrosive hydrogen-containing media.

EFFECT: improved and valuable properties of composition.

2 tbl

 

The invention relates to the field of composite compounds based on phenol-formaldehyde resins, in particular friction materials for structural elements of the brake device.

Known composite connection, for example a friction material according to A.S. 787433 containing phenol-formaldehyde resin, a mixture of fibrous fillers, organic and inorganic modifiers, friction, metal and metallocene supplements.

The disadvantage of this material is increased wear when working in conditions of corrosion, hydrogen-rich environment.

The closest analogues of essential features and the achieved result is "Composition for producing a friction material according to the patent of Russian Federation №2034869 containing on BNR rubber 2-4 wt.%, phenol-formaldehyde resin 12-14 wt.%, the copper powder 9-10 wt.%, barite 16-20 wt.%, alumina 9-11 wt.%, bronze shavings 4-6 wt.% blocked with caprolactam 2,4-toluylenediisocyanate 0.5 to 3 wt.%, graphite 1-2 wt.% and basalt fiber - rest. The song with the proposed combination of components provides a high strength of the material and allows to have a stable frictional characteristics in the range of operating temperatures up to 500-600°in conditions of dry friction.

The disadvantage of this material is Zn is a significant increase in wear when working in corrosive, a hydrogen-containing atmosphere, resulting from the effect of hydrogen wear evident at temperatures above 500°C.

Object of the present invention is to improve the frictional properties of the material, obtaining a technical result in the optimization of the influence of hydrogen wear and reduce the amount of wear material when working in corrosive hydrogen (water, hydrocarbon compounds, etc.).

The problem is solved in that in the known material containing on BNR rubber, phenol-formaldehyde resin, copper powder, barite, graphite and basalt fiber, added carbon fiber, magnesium oxide and powder of diabase, the particle size of which is 0.1-0.7 mm, in the following ratio of components; on BNR rubber 1-7 wt.%, phenol-formaldehyde resin 11-25 wt.%, the copper powder 7-9 wt.%, barite 17-19 wt.%, carbon fiber 11-13 wt.%, magnesium oxide 1-3 wt.%, powder diabase 2-4 wt.%, graphite 6-10 wt.% and basalt fiber - rest.

In existing compositions to obtain material friction destination specified set of essential features have been identified that can be considered an invention that meets the criterion of "novelty".

When working brakes in the braking mode consider is Ino high speed and effort resulting in friction pairs, cause a rapid rise of temperatures in places of contact. Temperature above 500°and the presence of corrosive hydrogen-containing environment create conditions for the emergence of tribotesting, accompanied by the release of free hydrogen, which, engaging in interaction with the material of the brake elements, resulting in a significant enhancement of the effect of hydrogen wear, which consequently leads to increased wear of the friction material.

The proposed technical solution, the introduction of well-known material powder diabase allows you to change the pH balance. Particles diabase actively adsorb released during tribotesting free hydrogen, thereby reducing its concentration in the contact zone, which limits the development of the effect of hydrogen-wear, optimizing its impact on the wear of the friction material, and together achieve the stated technical result. At lower operating temperatures in the contact zone occurs desorption of hydrogen in the atmosphere that allows you to repeatedly use the adsorption capacity of diabase.

The introduction of carbon fiber increases the strength, wear resistance and heat resistance of the composition, and the presence of magnesium oxide is its conductivity.

These significant the signs are interrelated and a change in any of them leads to a decrease of the characteristics of the material. So the content of the diabase in the amount less than 2 wt.% does not provide the amount of working capacity of the adsorbent required for neutralizing the effect of hydrogen wear. The content of the diabase in excess of 4 wt.%, reduces the strength characteristics of the material.

Application of powder diabase with particle size less than 0.1 mm reduces the surface area of the adsorbent in the boundary layer friction material, respectively, reduces the working capacity of the adsorbent. Application of powder with a particle size of more than 0.7 mm contributes to abrasive wear of the counterbody.

Other ingredients provide optimal physico-mechanical characteristics of the composition under conditions of dry friction.

Is used as a binder phenol-formaldehyde resin rezol or Novolac type (in either case, the phenomenon of hydrogen wear manifests itself equally) increase the content of which more than 25 wt.% reduces the friction coefficient, and a decrease of less than 11 wt.% does not provide the necessary heat resistance of the material.

Used as organic modifier on BNR rubber more than 7 wt.% reduces friction, and less than 1 wt.% initiates intensive wear of the counterbody.

The presence of copper powder in quantities of less than 7 wt.% does not provide dostatochno the heat sink and increases wear, more than 9 wt.% deteriorates toughness and strength of the material.

Inorganic modifiers: graphite, barite and magnesium oxide in the aggregate, increase the heat resistance, strength and wear resistance of the material, stabilize the coefficient of friction, but a reduction in the content of each of them beyond the lower values of the declared ratio leads to increased wear and a concentration above the upper values leads to a decrease of the friction coefficient due to the manifestations of the lubricating properties of the ingredients.

The reduction in the content of carbon fiber, has good reinforcing properties below 11 wt.% can not achieve the optimal values of hardness and strength of the material, an increase of more than 13 wt.% leads to rapid wear of the counterbody.

The claimed set of distinctive features in the sources of patent and scientific and technical information is not detected, which suggests this solution meets the criterion of "inventive step".

In table 1 examples of friction of the compositions in table 2 - test results.

During experiments conducted studies of compositions with different brands of material of the components. In particular was used phenol-formaldehyde resin SF 312, SF 342, SF 381, TFP L, TFP V; on BNR rubber SKN 26M, SKN AS and others; barite grades b-1, B-2, B-4, B-6; graphite GLS, GL-1, FPP-3. All the formulations showed similar characteristics when operating in hydrogen service.

As an example, for the preparation of compositions in table 1 were used the following materials: on BNR rubber SKN 26M GOST 7738-A, phenol-formaldehyde resin SF 342 GOST 18694-80, the copper powder PMS 1 GOST 4960, barite type a, grade B-1 GOST 4682-84, carbon fiber brand " 4, graphite brand voice GOST 5420-74, magnesium oxide, basalt fiber on THE 6-11-215-76.

In the process of testing material was carried out laboratory testing of samples on the machine friction And-47-K-54 at a pressure of 2.0 MPa, the temperature in the contact zone 20-700°and sliding velocity of 16 m/s the test Results show (see table 2), while retaining some of the main technical characteristics of the prototype, the proposed friction material reduces the amount of wear when working in corrosive environments 1.5-1.6 times in comparison with the known analogues.

Manufacturer offer the friction material is carried out by dry mixing in a rubber mixer by known technologies.

The result of the test material and the possibility of use in its manufacture are well known technologies confirms the relevance of the proposed invention, the criterion of "industrial applicability".

Table 1
ComponentsThe placeholderComposition, wt%
ControlOffer
12123
On BNR rubber46,51,5147
Phenol-formaldehyde resin121125111825
The copper powder1088987
Barite201818191817
Carbon fiber-1311131211
Graphite2881086
Magnesium oxide-13321
Powder diabase: fraction /td>
0.1 mm-1,5-4--
0,5 mm----32
0.8 mm--4,5-
Basalt fiber333321302724
Alumina11----
Bronze chips5--
Blocked with caprolactam 2,4-toluylenediisocyanate3-----

Table 2
PropertiesThe placeholderComposition, wt%
ControlOffer
12123
The coefficient of friction
- when dry friction0,340,370,370,370,380,37
when the friction in a humid atmosphere0,30,350,350,360,360,36
The wear of the composition, m2/kgf·m
- when dry friction5,764,24,63,43,23,2
when the friction in a humid atmosphere6,244,84,63,43,33,4
Wear iron counterbody, m2/kgf·m
- when dry friction0,240,20,230,20,20,2
when the friction in a humid atmosphere0,240,20,230,20,20,2

Composition to obtain a friction material containing on BNR rubber, phenol-formaldehyde resin, copper powder, barite, graphite and basalt fiber, characterized in that nedoponimanie contains carbon fiber and magnesium oxide, and powder diabase with a particle size of 0.1 to 0.7 mm in the following ratio of components, wt.%

On BNR rubber1-7
Phenol-formaldehyde resin11-25
The copper powder7-9
Barite17-19
Carbon fiber11-13
Graphite6-10
Magnesium oxide1-3
Powder diabase2-4
Basalt fiberRest



 

Same patents:

FIELD: electrical engineering; physical action-to-electric signal converters: strain-gage components, pressure sensors, push-button switches for handling electric signals.

SUBSTANCE: proposed electrically active polymer whose electrical activity depends on impact of external physical fields has molecular fragments possessing high polarizability and/or bistable electron energy structure with respect to excess electron capture process; molecular fragments are linked together through respective intermediate elements of molecular chain. Novelty is that electrically active molecular fragments form single macromolecular structure chemically bonded through molecular chains. Proposed material built around mentioned polymer is produced in the form of films or fibers, or coatings, or bodies of revolution; at least one of geometrical dimensions dictating material form does not exceed double depth of surface charge penetration.

EFFECT: enhanced response of material electric conductivity to external factors within wide film-thickness range; high reproducibility of useful properties.

81 cl, 1 tbl, 1 ex

FIELD: phenoplast production, in particular casting composition for technical applications.

SUBSTANCE: claimed casting composition included (mass %): novolac phenol-formaldehyde resin 47-49.3; wood powder 28.4-29.5; urotropine 7.1-7.4; kaolin 3.2-3.4; burnt magnesia 0.7-0.9; nigrosine 1.4-1.5; talk 3.7-3.9; naphthalene 1.9-2; stearin 0.2-0.4; calcium stearate 0.4-0.6; polyethylene wax 0.5-0.7; phosphoric acid triphenyl ester 1-5. Composition of present invention has increased destructive torque stress and decreased viscosity coefficient at 120°C and shear velocity gradient of 15 l/s.

EFFECT: composition with increased destructive torque stress and decreased viscosity coefficient.

4 ex, 1 tbl

FIELD: carbon materials.

SUBSTANCE: invention concerns production of polymer material, which can be employed to manufacture construction-destination porous carbon articles. Polymer composition is filled with hardened phenol-formaldehyde resin and powder-like vanadium complex VO(C36H49O5N2) formed when vanadium is recovered from exhausted process solutions produced in processing of ferrous-metallurgy charge slags as product of reaction between metavanadate and bis-amino-phenol-formaldehyde oligomer. Composition also includes lubricant. Proportions of constituents are the following, wt %: pulverized bakelite 36-43.8, hardened phenol-formaldehyde resin 36-43.8, vanadium complex 10-25, and lubricant 2.4-3.0.

EFFECT: increased strength of porous carbon articles.

1 tbl, 7 ex

The invention relates to the composition of the oligomeric acid catalyst as component of liquid compositions to obtain fenolformaldegidnyh (FF) foams, does not cause corrosion of metal or having a very weak corrosive effect on their surface

The invention relates to goodnaturedly mixtures for the manufacture of foundry cores and molds

The invention relates to the field of creation of filled polymer compositions with reduced Flammability based on phenol-formaldehyde resins, which can be used as interior materials, coatings and levelling compounds in the structures of polymeric and metallic structural materials in engineering and shipbuilding, aviation industry and construction

The invention relates to the manufacture graphitizing foam blanks, which can then be compacted to obtain a friction material

The invention relates to self-extinguishing polymeric compositions with a filler in the form of hollow microspheres, which are used to fill areas of honeycomb structures used in aeronautical engineering

The invention relates to polymer composite materials on the basis of phenol-formaldehyde resin (CFF) rezol type divinylacetylene carboxyl-containing rubber and an inorganic filler, intended for the manufacture of flashback arrestors according coatings (screens) during high-temperature exposure

Binder // 2216556
The invention relates to binders based navrachna phenol-formaldehyde oligomer (NFFO) to obtain a press-powders designed for operation in conditions of high loads

The invention relates to methods of obtaining compositions based on organic macromolecular compounds, and in particular to methods of manufacturing polymer composite materials, the products of which are used in brake and friction mechanisms

The invention relates to polymeric compositions friction destination and intended for the manufacture of products, working in brake nodes of mechanisms and machines

The invention relates to the production of materials suitable for work in conditions of wear and abrasion and corrosive environments

The invention relates to the field of chemistry and metallurgy, equipment manufacturing abrasive and frictional destination

The invention relates to chemistry and metallurgy, equipment manufacturing abrasive and frictional destination

The invention relates to the field of technological processes, and in particular to means for forming abrasive or friction articles from fibrous materials

The invention relates to chemistry and metallurgy, equipment manufacturing abrasive and frictional destination
The invention relates to mechanical engineering and Metalworking, and can be used on machine-building factories in the processing of metal waste in composite materials
Friction products // 2190788
The invention relates to friction products used in a variety of friction nodes
The invention relates to friction products, designed for operation in different friction mechanisms

FIELD: special compositions.

SUBSTANCE: invention relates to a method for preparing composition compounds based on phenolformaldehyde resins, in particular, friction materials for members of breaking device constructions. The composition for preparing friction material comprises the following components, wt.-%: butadiene nitrile rubber, 1-7; phenolformaldehyde resin, 11-25; copper powder, 7-9; barite, 17-19; carbon fiber, 11-13; graphite, 6-10; magnesium oxide, 1-3; diabase powder, 2-4, and basalt fiber, the balance. Invention provides enhancing friction properties of material resulting to optimization of effect the hydrogen wearing an reducing value of the material wear in its working in corrosive hydrogen-containing media.

EFFECT: improved and valuable properties of composition.

2 tbl

Up!