Polymer composition for anti-friction coatings

 

(57) Abstract:

The invention relates to the field of technical chemistry, and more specifically to polymer antifriction materials used in mechanical and instrument engineering as anti-friction coatings. The invention can be used in friction units of parts and machines working in air at 25 - 500oC. the Invention enables the manufacture of anti-friction material coating with a stable coefficient of friction at 25 - 500oC and high wear resistance up to 400oC. the Composition comprises (wt.h): polyaminoamide - 23, graphite - 1-30, N-220, an organic - 1000. table 2.

The invention relates to the technical chemistry, and more specifically to polymer antifriction materials used in mechanical and instrument engineering as anti-friction coatings.

The invention can most effectively be used in machine building and instrument making in the friction of the parts and machines operating at a temperature of 25 500oC.

Known anti-friction composition, selected as a prototype containing polyamide binder and an antifriction filler. As the polyamide resins is used, prepolymer and Kannapolis graphite, molybdenum disulfide and a binder is carried out both in dry form and in solution of the resin, including N-organic. This filler can be entered in the finished prepolymer, and at the stage of its synthesis. Samples of this composition have a stable coefficient of friction up to 200 250oC. However, above this temperature it won't work.

The objective of the invention is to develop a resin composition for anti-friction coatings with stable friction coefficient at 25 - 500oC and high wear resistance up to 400oC.

It was found that the introduction of graphite filler in the composition at the stage of synthesis of the binder (prepolymer PANI) simplifies technology for composition and creates conditions for a more uniform composition due to the stability of the suspension and the stability of the composition during storage that simplifies the technology of coating and has a positive effect on anti-friction properties of the coating.

This effect is implemented in the following ratio, wt. h

MRS. 23

Graphite 1 30

N-Organic 220 1000.

The technology of obtaining the composition is as follows: upon receipt of the polymer PA is about acid in the environment N-methylpyrrolidone in the presence of a catalyst (benzoic acid and benzimidazole) in the reaction mass is injected graphite. In response receive a stable homogeneous suspension of graphite in a solution of the prepolymer MRS General formula

< / BR>
in N-organic.

As a binder was used, the prepolymer, obtained by low-temperature condensation of 3,3', 4,4'-tetraaminodiphenyl and dianhydride 1,4,5,8-naphthalenemethanol acid in the environment N-methylpyrrolidone in the presence of a catalyst.

As antifriction filler was used graphite marks C1 OST 6-68-431-75.

The technology of obtaining simple: the resulting suspension is applied on a metal surface with a spray gun and thermoablative in vacuum at 250 300oC.

The floor felt on the machine end friction at a load of 1 kg/cm2and speed of 0.3 m/s in the air on steel counterbody (steel H).

Below are examples of specific formulations of the inventive compositions and friction properties of the obtained materials (coefficient of friction in the range of a temperature of 25 500oC, weight wear at 25 400oC). Cm. table. 1 and 2.

The proposed composition is simple in manufacturing, technology for fetching coating method lacquer application.

The coating of the inventive high-wear resistance (0,210-80,410-8in the temperature range 25 to 400oC.

Polymer composition for anti-friction coating, consisting of a heat-resistant binder amidnogo type, graphite and N-methylpyrrolidone, characterized in that it as a heat-resistant binder amidnogo type contains polyaminoamide in the following ratio, wt.h.

Polyaminoacid 23

Graphite 1 30

N-220 organic o

 

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