Asbestos-free polymer friction composition

FIELD: chemistry.

SUBSTANCE: invention concerns asbestos-free polymer friction compositions and can be applied in production of brake shoes. Composition includes, wt %: linking agent out of high-molecular unsaturated hydrocarbon rubbers 19-24; mineral fillers of concentrated barite 18-25 and alumina 6-8; asbestos-free fibrous filler of kevlar pulp 1.5-3.0, arselon pulp 1.5-3.0, and wollastonite 2-5; carbon fillers of Carbon black 6.95-15.0, and graphite 24-30; curing group of sulphur 1-3, 2-mercaptobenzothiazol 0.5-0.9, and thiuram 0.03-0.15.

EFFECT: enhanced durability, friction rate stability of products manufactured on the basis of claimed composition, reduced product cost and emission of hazardous substances to environment.

1 tbl

 

The invention relates to polymeric compositions friction purposes and may be used in the manufacture of brake pads and linings of the brakes of vehicles and other mechanical objects.

The prior art composition for non-asbestos friction material containing rubber, vulcanizing the group on the basis of sulfur, a fibrous filler, a metallic filler, a friction modifier based on graphite, inorganic modifier is a mixture of barite concentrate and alumina. As the rubber used rubber SKD, as the fibrous filler is a mixture of polyoxadiazole fiber and mineral wool as metal-containing filler - roll iron stabbing, as a friction modifier, a mixture of graphite crystalline and cryptocrystalline graphite and carbon technical, and to the mixture of inorganic modifier added to the zeolite in the following ratio of the components of the composition, wt.%: Rubber SKD 18,00-22,00; Sulfur 1,50-2,50; 2-Mercaptobenzothiazoles 0,35-0,45; thiuram 0,10-0,30; Polyoxadiazole fiber 2,00-4,00; Mineral wool 18,00-22,00; the Fraction of iron split 4,00-6,00; Graphite crystal 2,00-3,00; cryptocrystalline Graphite 2,00-3,00; Carbon technical 6,00-8,00; Barite concentrate 27,00-28,00; Alumina 6,00-8,00; Zeolite 2,50-3,50 (R 2296778, 10.04.2007).

Known friction polymer composition, comprising a binder, a fibrous non-asbestos filler, inorganic modifier - barite, friction modifier - graphite and vulcanizing the group. As a binder taken rubbers from the group of high molecular weight unsaturated hydrocarbon rubbers: a mixture of CDS and SKI-3 with the addition of industrial oils And 20, as the fibrous filler used wollastonite, as a vulcanizing group contains sulfur, captax, thiuram, zinc oxide, further comprises carbon black and a binder modifier from the group of dibasic organic acids, including orthophthalic, isophthalic and terephthalic acid in the following ratio of the components of the composition, wt.%: binder from the group of unsaturated hydrocarbon rubbers: mix CDS, SKI-3, industrial oil And 20 10,0-13,0; non-asbestos Fibrous filler is wollastonite 50,0-55,0; Inorganic modifier-barite 19,0-25,0; Friction modifier - graphite 2,0-4,0; Carbon technical 1,5-1,9; Curing group: sulfur 3,0-4,0, captax of 0.2-0.5, thiuram 1,2-1,7, zinc oxide 0,3-0,7; Modifier binder from the group of the dibasic organic acid, orthophthalic, isophthalic and terephthalic acid is 0.1 to 5.0 (EN 2275394, 27.04.2006).

Closest to the proposed invention is a polymeric compositions the Oia friction destination containing butadiene rubber, vulcanizing group, powdered fillers, including barite concentrate, carbon black, filler based on aluminium oxide, crystalline graphite, cryptocrystalline graphite and fibrous reinforcing filler, which is used as a synthetic fiber, polyaramid threads, and the ratio of the powdery fillers for reinforcing fibrous filler is (12-50):1, in the following ratio of components in the composition, wt.%: Butadiene rubber 23-25; Vulcanizing group (sulfur and accelerators from the group thiazolo and Turnov) 3,05-3,45; Barite concentrate 8-11; carbon 19-21; Graphite crystal 9-11; cryptocrystalline Graphite 19-21; Filler based on aluminium oxide (aluminium oxide, alumina and kaolin) 9-11; Synthetic fibers, polyaramid threads (Arselon, servicecapture fiber (CBM), Kevlar, Twaron) of 1.5-5 (EN 2285704, 20.10.2006).

The disadvantage of these compositions is the fact that made on the basis of their products do not have a sufficiently high and stable coefficient of friction, have high wear resistance and high cost.

The challenge which seeks the proposed invention, is to establish a non-asbestos friction polymeric composition, which would exclude the above is not the leftovers.

Technical result achieved in the implementation of this invention is to improve durability made of her products, the stability of the coefficient of friction is made on the basis of products, reducing production costs and the emission of harmful substances into the environment during their manufacture.

This technical result is achieved in the non-asbestos friction polymeric composition containing as a binder from the group of high molecular weight unsaturated hydrocarbon rubbers, polybutadiene rubber, SKD, mineral fillers, including barite concentrate and alumina, non-asbestos fibrous filler containing Kevlar pulp, Arselon pulp and wollastonite, carbon fillers, including carbon technical and graphite, vulcanizing group containing sulfur, 2-mercaptobenzothiazoles and tioram in the following ratio, wt.%:

Rubber SKD19-24
Barite concentrate18-25
Alumina6-8
Kevlar pulp1,5-3
Arselon pulp 1,5-3
The wollastonite2-5
Carbon technical6,95-15
Graphite24-30
Sulfur1-3
2-Mercaptobenzothiazoles0,5-0,9
Thiuram0,03-0,15

Use as a binder from the group of high molecular weight unsaturated hydrocarbon rubbers butadiene rubber SKD can significantly reduce the release of harmful substances into the atmosphere in the manufacture of products, to ensure the stability of frictional properties and wear resistance.

The use of wollastonite having a needle-like structure, as the fibrous filler, replacing the asbestos increases the durability of products, reduces the hazard in the manufacture of products and their subsequent operation.

The use of Kevlar pulp, Arselon pulp as a fibrous filler produced by the method of raspushenny cut Kevlar, Arselon fiber, replacing asbestos, ensures high thermal durability, stability, coefficient of friction, improve wear resistance.

C the show asbestos-free friction polymer composition is made by mixing all ingredients in mixer with Z-shaped rotors.

Examples of the claimed composition are presented in the table.

Examples of the claimed composition
Name of the componentContent, wt.%
12456
1. Rubber SKD19,022,020,024,0
2. Mineral fillers
- Barite concentrate25,020,025,018,0
- Alumina7,977,158,06,0
3. Non-asbestos fibrous filler
- Kevlar pulp1,52,02,23,0
- Arselon pulp2,02,01,53,0
- Wollastonite4,04,02,05,0
4. Carbon fillers
- Carbon technical15,0to 12.010,06,95
- Graphite24,028,029,030,0
5. Curing group
- Sulphur1,02,01,53,0
- 2-mercaptobenzothiazoles0,50,750,70,9
- Thiuram0,030,10,10,15
Total100100100100

Thus, the use of the claimed composition can significantly improve physical and mechanical characteristics of the finished product, to make products with high strength characteristics, to ensure the stability of the coefficient of friction, improve wear resistance of the finished products, thereby increasing the reliability of friction products, as well as significantly reduce the release of harmful substances into the atmosphere during the production process and their subsequent operation.

Non-asbestos friction polymer composition, characterized in that it contains a binder from the group of high molecular weight unsaturated hydrocarbon rubbers, mineral fillers, including BA is Italy concentrate and alumina, non-asbestos fibrous filler containing Kevlar pulp, Arselon pulp and wollastonite, carbon fillers, including carbon technical and graphite, vulcanizing group containing sulfur, 2-mercaptobenzothiazoles and tioram in the following ratio, wt.%:

binder from the group of high-molecular
unsaturated hydrocarbon rubbers19-24
barite concentrate18-25
alumina6-8
Kevlar pulp1,5-3,0
Arselon pulp1,5-3,0
the wollastonite2-5
carbon technical6,95 to 15.0
graphite24-30
sulfur1-3
2-mercaptobenzothiazoles0,5-0,9
thiuram0,03-0,15



 

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Rubber compound // 2318842

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14 tbl, 13 ex

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