Polymeric friction composition

FIELD: polymer materials.

SUBSTANCE: invention relates to vehicles and lifting-and-shifting machines as well as to allied technical fields wherein friction phenomenon is used to achieve a positive effect. Composition according to invention contains, wt %: binder based on rubbers SKI-3 and SKD 11.5-13.0, wollastonite 50.0-54.5, barite 23.5-24.5, graphite 3.0-3.7, carbon black 1.5-1.9, sulfuric curing system: sulfur 3.5-4.5, captax 0.2-0.5, thiuram 1.2-1.7, zinc oxide 0.3-0.7, and, above 100%, modifier selected from group: stearic acid, oleic acid, stearic acid/oleic acid mixture at ratio between 40:60 and 0.02:0.5 or above mixed modifier with terephthalic acid in total amount 3 wt parts or stearic acid in amount 0.02-0.5 wt parts per 100 wt parts rubber mixture.

EFFECT: improved physicochemical properties and reduced rheological characteristics of composition.

2 tbl, 2 ex

 

The invention relates to a motor technique and lifting-transport machines, as well as related areas of technology where we use the phenomenon of friction to achieve a positive effect.

With the development of technology growing medium speed and frequency of braking, all this imposes more stringent requirements for materials working in the friction nodes.

To achieve the required braking of vehicles and other objects long enough to use the friction surfaces. In most cases this is achieved by pressing a specially crafted compositions to the metal surface. Thus the friction compositions have a number of requirements, in particular: high coefficient of friction, durability, good thermal conductivity, a small change in the coefficient of friction in a wide temperature range, low cost, low toxicity components.

For a long time as friction compositions were used preparations with a basis of asbestos, which is characterized carcinogenic properties. In this regard, in most industrialized countries, the use of asbestos is prohibited. This circumstance prompted the search for other microarray fillers. It was found that the mineral wollastonite can be a useful alternative to the SSA the students in some areas of technology.

In relation to the compositions of the friction materials of the wollastonite is a series of compositions that are patented.

Thus, in patent No. 2090578 EN [1] variants of friction polymer composition, which comprises, by wt.%: rezol phenol-formaldehyde resin 13-15; on BNR rubber 3-5; aramid fiber 2,5-3,0; basalt fiber, the surface of which is modified 3-4 wt.% polyorganosiloxane, 8-10; wollastonite, the surface of which is modified 2-10 wt.% carbon modifier, 10-12; alumina 4-8; graphite 1-2; copper powder 10-15; bronze shavings 10-15; barite - the rest is up to 100.

The second option compositions similar to the first, but use of wollastonite, the surface of which is modified 3-4% paliperidonesee. The composition is prepared in a rubber mixer mixing at 90°C for 15-18 minutes. After curing within 1-7 days the material is crushed and molded first in cold and then in hot press at 190°s With a pressure of 30-40 MPa, the finished product thermoablative within 2-3 h at 200°C.

A significant disadvantage of this technical solution is:

- the use of toxic phenol-rubber binder;

the use of wollastonite containing on the surface of hydrocarbon modifier, since the modification of the surface of the wollastonite is selfreliance is positive costly scientific and technical task.

In patent No. 2119511 EN [2] describes friction polymer composition of the following composition: binder from the group of a phenol-formaldehyde resins, fibrous filler, metal-containing compounds, organic, friction and inorganic modifiers. As the fibrous filler, the composition comprises a mixture of glass filaments and mineral wool as metal-containing fillers - brass, bronze flakes, micro-powder, copper powder, lead powder, Ferragosto, iron ore concentrate, or their mixture, as the organic modifier - on BNR rubber, as the friction modifier is a mixture of graphite powder and antimony techservices, as inorganic modifier substances from the group of: barite concentrate, alumina, vermiculite and needle wollastonite or their mixture, and additionally contains as a vulcanization agent is a mixture of sulfur, wollastonite and zinc oxide, and as filler phenolic binder - acicular wollastonite. The mixture of components is done in two stages: the first preparing a mixture of a phenolic binder with needle wollastonite, a second mixture of a fibrous filler, a vulcanization agent, and organic friction modifier, the resulting mixture is mixed with the remaining components.

- use as a binder phenol-formaldehyde resins with high toxicity;

- the use of metal shavings, which during operation of the friction material will provide increased wear of the brake pads.

Patent RU 2275394 [3], the prototype offers friction polymer composition comprising a fibrous non-asbestos filler, inorganic modifier - barite, friction modifier - graphite, vulcanizing the group. The binder contains rubbers from the group of high molecular weight unsaturated rubbers: a mixture of SKI-3 and ACS; plasticizer polymer binder is an industrial oil I - 20; as a vulcanizing group contains sulfur, captax, thiuram, zinc oxide; as a friction modifier is carbon black; a modifier from the group of dibasic organic acids with ortho-phthalic, isophthalic, terephthalic acid (over 100%). The mixture of components is done in two stages: the first preparing a mixture of unsaturated binder with needle wollastonite, the second a mixture of fibrous filler, a vulcanization agent, and organic friction modifier, the resulting mixture is mixed with the remaining components.

The disadvantage of this technical solution is the high viscosity of this composition and Nirav Mirnoe distribution of components by volume of the material.

The proposed solution is aimed at creating friction polymer composition having improved physical and mechanical properties and reduced rheological parameters. In the proposed composition as a binder a mixture of high molecular weight unsaturated hydrocarbon rubber SKI-3 and ACS, plasticized industrial oil I-20. In addition, the composition of the friction composition comprises non-asbestos fibrous filler wollastonite, inorganic modifier barite, frictiony modifier graphite, carbon technical, the sulfur vulcanization system containing sulfur, zinc oxide, captax, thiuram, modifier, a binder, characterized in that as a modifier of the binder composition contains a modifier selected from the group of: stearic acid, oleic acid, a mixture of stearic and oleic acids in the ratio of 40:60 or mixed modifier of terephthalic and stearic acids.

Despite the expected decline in physical-mechanical properties of hardened friction compositions it was found that the introduction of the above-mentioned binder modifier leads not only to reduce the viscosity of the composition 5-7 times, but in some cases to a significant improvement of physical-mechanical characteristics (table 2, part 11). In General, we can say that th is the improvement of physical-mechanical characteristics of such parts, as the friction brakes for cars "Lada", is about to 19.5 times.

The mechanism of action of modifiers is not fully understood, however it can be assumed that it is associated with their properties as substances with surface-active properties, as well as their ability to exert an activating effect on the process of vulcanization (4-9).

Examples of carrying out the invention

Example 1

Taken hinge rubber SKD 85 g, SKI-3 85 g, industrial oil And 20 to 30 grams and is the plasticization of rubber on a laboratory roll mill. When the rolls into the gap between the rollers is placed ACS before the formation of smooth "stocking" and then enter parts of SKI-3 and industrial oil. By increasing the proportion of plasticizer in the rubber mix to increase the clearance between the rollers and the number of revolutions of the rolls. The finish rolling after the introduction of the entire sample industrial oils. Total time rolling rubber mix for 30 minutes.

Received plasticized mixture of rubbers removed from the roll with a knife, pre-reducing the number of revolutions of the rolls.

From the mixture of rubbers selected a portion 26 g, which is placed in the gap between the rollers upstream rollers. After the formation of the smooth "stocking" of a mixture of rubber start to enter the components of the friction composition in the set is hinnon order.

The order of introduction of the components shown in table 1.

The modifier is introduced at the stage of formation of "stocking" of the polymeric binder.

Table 2
The results of physico-mechanical tests
CompositionFeatures
The modulus of elasticity Epanel, MPaThe effective density of knitting υe/υ, mol/cm3The shear modulus, Eadd, MPa
1245
12000,003411,5
2to 108.20,01084,06
354,20,00782,9
42000,003411,5
51280,00862,6
617,80,00621,79
72000,003411,5
81670,00773,37
9920,0078 2,44
102000,003411,5
113130,01035,51
121980,00954,58

Example 2

Taken hinge rubber SKD 85 g 85 SKI g, industrial And oil-20 30 and is the plasticization of rubber in a paddle mixer. After loading the sample rubber mixer pour the softener and put him in a box, which then presses the lid of the mixer. Thus, it is possible for 35-40 minutes to obtain a homogeneous zaplatilova a mixture of rubber, which is injected into the mixer, and then the remaining powdered components (see table 1). The time of mixing the components in the mixer 12 minutes.

After mixing friction mass discharged from the mixer, cooled and placed in a hammer mill for grinding, and then placed in a mold for vulcanization. Curing mode is as follows:

cold-pressing at a pressure up to 4 MPa;

hot pressing at a pressure of 20 MPa, a temperature of 185-200°and the shutter speed for 5 minutes;

- removing the pressure and shutter speed for 5 minutes;

- final pressing at a pressure of 20 MPa and a temperature of 185-200°C for 7 minutes.

Properties of the samples are identical to the images obtained by the PR is a measure of 1.

Presents songs in the future we plan to implement in the production of friction materials on the Barnaul plant of asbestos-technical products in mid-2007

References

1. RF patent 2090578 from 20.09.1997.

2. RF patent 21195511 from 21.02.1996.

3. RF patent 2275394 from 10.01.2006, prototype.

4. Fillers for polymer composites (reference manual). Under. edit Gsize and Dvilansky; Per. s angl. under. edit Pghballetschool. M.: Chemistry, 1981, p.37.

Polymer friction composition, comprising a binder based on a mixture of high molecular weight unsaturated hydrocarbon rubber SKI-3 and ACS, plasticized industrial oil I-20, non-asbestos fibrous filler wollastonite, inorganic modifier barite, friction modifier graphite, carbon technical, the sulfur vulcanization system containing sulfur, zinc oxide, captax, thiuram, modifier, a binder, characterized in that as a modifier of the binder composition contains a modifier selected from the group of: stearic acid, oleic acid, a mixture of stearic and oleic acids in the ratio of 40:60 or mixed modifier of terephthalic and stearic acids at the following ratio of the components of the composition, wt.%:

pointed to by the E. binder 11,5-13
the wollastonite50,0 is 54.5
bariteof 23.5 and 24.5
graphite3,0-3,7
carbon technicalof 1.5-1.9

the sulfur vulcanization system:

sulfur3,5-4,0
captax0,2-0,5
thiuram1,2-1,7
zinc oxide0,3-0,7

and in excess of 100 wt.% the modifier parts by weight based on 100 parts by weight of a mixture of rubber:

modifier selected from the group:
stearic acid, oleic acid,
a mixture of stearic and oleic acids in the ratio of 40:600,02-0,5

or specified spot modifier:

terephthalic acid3
stearic acid0,02-0,5.



 

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