Method of producing frictional polymer materials

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing frictional polymer materials and can be used in making brake shoes of railway wagons and locomotives, for motor transport, cranes, clutch plates and other articles. The method is realised by processing butadiene or butadiene-nitrile rubber on plastification equipment and mixing the rubber with curing agents, with fibre and powdered filling materials. Aromatic polyamine is simultaneously added with curing additives. The aromatic polyamine is an aniline-formaldehyde condensate consisting of 75% isomers of diaminodiphenylmethane and 3-4 benzene-nuclear primary amines bound by methylene bridges. The fibre filler is pre-saturated for 15 minutes with aqueous solution of epoxy resin which is a product of reacting a mixture of diane and aliphatic epoxy resins with glycols or derivatives thereof, in ratio A:B between 95:5 and 60:40, and then dried to moisture not higher than 1%. The composition of the material contains the following in pts. wt: rubber 100, aromatic polyamine 2-20, sulphur 1-15, thiuram 0.04-2.0, 2-mercaptobenzothiazole 0.3-4.0, fibre filler 15-100, powdered filler 10-100.

EFFECT: invention improves strength characteristics of frictional polymer materials and increases labour safety.

2 tbl, 7 ex

 

The invention relates to a method for producing a friction polymeric materials and can be used in the manufacture of brake shoes for railway cars and locomotives, vehicles, cranes, clutch plates and other products.

Known friction polymeric materials and methods for their production on the basis of butadiene rubber containing vulcanizing-type additives sulfur, turama and other sulfur-containing substances, including mineral powders, inorganic fibers and metal shavings (see encyclopedia of polymer. V.3 M.: Izd. "Soviet encyclopedia", 1977, str-788).

The disadvantages of this method and material are the low strength properties of the material due to poor adhesion of the polymer to the fibers, fiber failure in the process of mixing the components, the formation of fibrous dust hazardous to health personnel, and insufficient high-friction properties.

One way to eliminate the above disadvantages described in the patent RU 2.114.338 C1, namely, that applied polymer fibers subjected to local destructive effects (similar to 2).

Application of organic fibers when mixed with rubber and vulcanizing additives after destructive processing of fibers can improve the adhesion at the boundary of the rubber-fiber, but does not allow the us to increase the strength characteristics of the friction material and, moreover, their resistance to heat.

The closest prototype of the proposed solution is the way to obtain friction polymer material by processing plastification equipment (rollers) butadiene or butadiene-nitrile rubbers with alloy epoxy resins with 4,4-dioxideemissions and phenol-formaldehyde resin, followed by mixing with vulcanizing additives and fillers, fibrous and powder (see EN 2.175.335, C2 from 27.04.1999,)

The above method can improve the strength characteristics and durability of the brake coupling. However, modern rail transport requires a higher strength characteristics of the friction materials and improvement of technologies of their production, excluding, in particular, the allocation of fibrous dust, especially asbestos and fiberglass, with the use of fibers in all known ways, including in the prototype.

The purpose of the claimed invention is a significant improvement in strength characteristics of the friction polymeric materials, as well as increased safety in the process of mixing the components on plastification equipment - rollers, rubber and other

This goal is achieved by the fact that simultaneously with the vulcanizing additives injected aromatic polyamine, representatives of the Commissioner, an aniline-formaldehyde condensate, consisting of 75% of the isomers of diaminodiphenylmethane and 3-4 Benalmadena primary amines, corresponding methylene bridges, and the fibrous filler (A) pre-soaked for 15 min in an aqueous solution of epoxy resin (B), representing the product of the interaction of the mixture Dianov and aliphatic epoxy resins with glycols or their derivatives in the ratio a:B is from 95:5 to 60:40, and then is dried to a moisture content of not more than 1%, while the material contains, in parts by weight:

Rubber100
Aromatic polyamine2÷20
Sulfur1÷15
Thiuram0,04÷2
2-Mercaptobenzthiazole0,3÷4
Fibrous filler
impregnated water-soluble epoxy15÷100
Powder filler10÷100

Example 1

Preparation of pre-impregnated fibrous filler.

In a paddle mixer is loaded 60 parts by weight of the ruble is on the fiber diameter of the fibers 13 microns (A) simultaneously with a 50% aqueous solution waterborne epoxy ETAL AK-732 (TU 2241-824-18826195-06), representing a product of the interaction of the mixture Dianov and aliphatic epoxy resins with polyethylene glycol (B), when the ratio a:B=78:22 when calculated on the dry component B. After stirring for 15 min impregnated fiber goes into the dryer to remove water at 100°C. the Dry impregnated fiber is elastic fibrous mass odorless, non-dusting, non toxic, easily breaking up with minor discontinuous effort. Since the resin does not contain a hardener, retention, soaked with it, fiber is practically unlimited (tested over 2 years) and therefore it can be prepared in advance.

Obtaining friction material

In the rubber mixer type RSVD 140-20 loaded 100 parts by weight of butadiene rubber stamps SKD-2 (GOST 14924), 8 parts by weight of sulfur, technical ground natural varieties 9995, 1 parts by weight of teorama (GOST 740), 2 parts by weight of 2-mercaptobenzthiazole (GOST 739), 45 parts by weight of the powder filler consisting of a mixture of the alumina (GOST 30558), crystalline graphite (GOST 5279), barite concentrate (GOST 4682) in equal proportion. Simultaneously loaded 10 parts by weight of aromatic polyamine (TU 2473-342-05763441-2001), representing aniline-formaldehyde condensate, consisting of isomers of diaminodiphenylmethane (75%) and 3÷4 nuclear (benzene nuclei) primary amines, corresponding methylene bridges. the romantic polyamine is known as a classic hardener of epoxy resins (hot curing), and its amino able to join double bonds to the rubber. Later in the rubber mixer is loaded 60 parts by weight of glass fiber impregnated with epoxy resin. Mixing is carried out at 80°C for 25 minutes. After making the mixture opens the lower stopper rubber mixer, the weight is unloaded and then is directed to the manufacture of products by hot pressing at 180°C for 25 min under a pressure of 31 MPa followed by heat treatment in a thermostat at the same temperature for 25 minutes

Examples 2÷7 are carried out analogously to example 1, but with the change of the composition in accordance with table 1.

Properties of the obtained friction material are shown in table 2.

The inventive method allows to significantly improve the strength characteristics of the resulting friction material (see table 2) and, possibly, in-depth studies of absolute advantages. Fibers impregnated with an aqueous solution of epoxy resin, in contrast to covered much better preserved in the process of mixing with the rubber. For example, glass fiber on rollers or rubber mixer collapses to the size of 0.5 mm in length and impregnated practically retains its original size, which is a major factor in increasing the reinforcing effect.

No less important is trannie dust when using an aqueous solution of epoxy resin.

Introduction to the composition of the material of epoxy resin significantly improves the adhesion of rubber to fiber, since the curing agent is an aromatic amine interacts with resin and rubber, and the material promotes adhesion to the metallic frame brake pads.

Table 1
The parameters of the proposed method in examples 2-7
No.The name of the parameterParameter examples
234567
1Type and brand of rubberButadiene SKD-2Butadiene SKD-1Nitrile butadiene SKN-18Nitrile butadiene SKN-26Nitrile butadiene SKN-18Nitrile butadiene SKN-18
2The amount of vulcanizing components, parts by weight of Aromatic
polyamine121222022
Sulfur1158888
Thiuram110,0420,040,04
2-Mercaptobenzthiazole0,324244
3Type of fibrous filler and the amount, parts by weightAsbestos 15Basalt fiber 100 Fiber Arselon 60Polyamide fiber 60Fiber Arselon 60Fiber Arselon 60
4The ratio of components a:B60:4095:572:2872:2872:2872:28
5The type and amount of powder filler, parts by weightOxide 10A mixture of barite concentrate and graphite 1:1Iron powder 40Brass shavings 50A mixture of barite concentrate of graphite and borax 49:49:2A mixture of barite concentrate of graphite and molybdenum oxide 49:49:2
90100100
6Type of glycol in the water-soluble compositionThreateningly-ColDiethyl what ngli-Col Polietilen-likely with 400 mmPolietilen-likely with 400 mmPolietilen-likely with 300 mmPolietilen-likely with 600 mm

Table 2
The properties of the products obtained from the friction of polymeric materials according to examples 1-7 in comparison with analogue and prototype
No.Name of indicatorValue
1234567Similar 1 encyclopedia of polymersThe prototype EN 2.175.335
1Flexural strength, MPa90859593881565
2The tensile strength, MPa70758278763537
3The coefficient of friction according to GOST 107910,580,560,540,530,560,520,490,380,56
4Wear GOST 107910,080,070,070,080,080,080,070,110,05

The way to obtain friction polymeric materials, including the processing of butadiene or butadiene-nitrile rubbers on plastification equipment and their subsequent mixing with vulcanizing additives sulfur, turama, 2-mercaptobenzthiazole and fibrous order the holder in combination with a powder filler - fine mineral or metal powder, characterized in that simultaneously with the vulcanizing additives injected aromatic polyamine, which was an aniline-formaldehyde condensate, consisting of 75% of the isomers of diaminodiphenylmethane and 3-4-Benalmadena primary amines, corresponding methylene bridges, and the fibrous filler (A) pre-soaked for 15 min in an aqueous solution of epoxy resin (B), representing the product of the interaction of the mixture Dianov and aliphatic epoxy resins with glycols or their derivatives, in the ratio a:B is from 95:5 to 60:40, and then is dried to a moisture content of not more than 1%, while the material contains, in parts by weight:

rubber100
aromatic polyamine2-20
sulfur1-15
thiuram0,04-2,0
2-mercaptobenzthiazole0,3-4,0
fibrous filler
impregnated water-soluble epoxy15-100
powder filler10-100



 

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1 tbl, 10 ex

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