SU533609A1 - Anti-friction press composition "thermoanthracitoplast" - Google Patents

Description

heat and electrical conductivity and 1.5–2 times greater mechanical strength than carbon and graphite materials obtained on a pek.voy binder.

A significant disadvantage of antehymitic products is their relatively low wear resistance, i.e., low abrasion resistance. In addition, antegmit is prepared from relatively scarce and expensive material — graphite.

The purpose of the invention is to eliminate the noted deficiencies inherent in both carbon and ante-grits, and to obtain parts with high wear resistance.

To do this, in an antifriction carbon-graphite press composition based on individual or combined synthetic resins (e.g., phenolform aldehyde, epoxy) with additional purpose (hardener, plasticizer, stabilizer, etc.) acting as a binder The filler is thermally treated at 900-1400 ° C with anthracite (thermoanthracite) with the addition of a reinforcing and / or modifying component, for example graphite, carbon or cotton fiber, in the following ratio of components .(weight. %):

Binder

Synthetic resin (phenol-formaldehyde, epoxy, furfurol or their mixture)

Direct additive (hexamine, benzenesulfonic acid, polyethylene polyamine, stearin, oleic acid, dibutyl phthalate, etc.)

Filler

Thermoanthracite

Graphite or graphite and fiber component

The essential difference between the proposed press package and the known one taken as a prototyl, due to which the goal is achieved, is the predominant content of a new component in it, terajuanthracite with a reinforcing and / or modifying additive, which is taken in an amount up to 20% of the largest amount of filler in the press composition or 18 wt. % based on the ratio of ingredients.

Example 1. To obtain a carbon fiber press composition, ingredients are used (wt.,%):

Thermoanthracite

Phenol formaldehyde resin (liquid)

Ground graphite

Oleic acid

Thermoanthracite together with graphite in the specified ratio is crushed to a maximum grain size of not more than 0.4 mm. Next, the carbon-graphite mixture is loaded into the mixer, phenol-formaldehyde resin is added together with oleic acid and stirred for an hour. After the mixer, the mixture is placed in a drying chamber, gdz at a temperature of 60-70 ° C in an air tray, it is dried to a volatile content of 4-5%. Standard samples are prepared from the prepared compression composition by hot pressing. Pressing is carried out at a specific pressure of 300 kg / cm with an exposure under the press for 1 min per 1 mm of the thickness of the product. The temperature of the matrix is maintained at 170 ° C, the punch - 160 ° C. The properties of the tested samples are shown in the table.

Example 2. To obtain a press set, the following ingredients are used (wt.%):

Thermoanthracite58

Phenol formaldehyde resin (liquid) 22

Carbon fiber13

Ground graphite5

Oleic acid2

According to the method of example I, thermoanthracite is first obtained, which, together with graphite, is ground to a grain size of no more than 0.2 mm. Next, the mixture is loaded into the mixer, cut carbon fiber is added in separate portions (with a filament length of no more than 10-15 mm), the resin is introduced together with oleic acid, and the components of the latex composition are carefully transferred during 30 minutes while the mass is heated to 60 70 ° C. The prepared press composition is supplied for hot pressing of the samples at a specific pressure of 200 kg / cm, the matrix temperature of the matrix is 160 ° C and the punch is 150 ° C. The rate of curing of the specimens is the same as in Example 1. Some samples in the “stripped form are additionally treated at temperature of 160 ° C for 4 hours. The test results are shown in the table.

Example 3. Composition

press compositions 65 (wt.%): Thermoanthracite63,5 Epoxy resin brand ED-618.0 Milled graphite 10,0 Dibutyl phthalate 5,0 Polyethylene polyamine. 3.5 Preparation of thermoanthracyte and preparation of a mixture of thermoanthracite with graphite is carried out in the same way as in the previous examples. The binder is prepared by diluting the epoxy resin with dibutyl phthalate followed by adding polyethylene polyamine. The well-mixed binder is introduced into the mixture of thermo-anthracite and graphite in a mixer, and all the components of the press composition are further mixed for 30 minutes. Samples are made from the prepared press composition at ordinary temperature by pressing. The specific pressing pressure is 120 kg / cm. Pressing lead in removable press; forms. After daily curing, the samples are freed from the molds and one part of them is immediately tested for physical and mechanical properties, and the other is additionally kept for 2 days, after which they are also tested. The test results are shown in the table. 4. Composition of press comings Example (wt.%): Thermoanthracite Phenolform aldehyde resin brand VIAM-B Milled graphite Bsnzolsulfonic acid

The process of preparing thermoanthracite l of a mixture of thermoanthracite with graphite is similar to the previous examples. The grain size of the mixture is not higher than 0.4 mm. The resin is heated to 50 ° C, benzosulfonic acid melted at 50-60 ° C is introduced, mixed thoroughly and cooled to room temperature (18-20 ° C). After cooling, the resin is added to the mixture and stirred for 15 minutes. The press composition prepared in this way is loaded into molds smeared with petroleum jelly and samples are formed at pressures up to 100 kg / s. After 60 min, the samples are freed from the molds; m, kept for a day, to and

The carbon-graphite press composition allows to obtain products with greater wear resistance, higher mechanical strength indicators. They are lighter in weight and cheaper than products made

similar recipes, but in which instead of thermoanthracite used graphite. Saving in the production of the claimed carbon-graphite press composition, depending on its composition, will be from 75 to 160 rubles. per 1 t

(at ash content of graphite and thermoanthracite 8.5%; see price list jY 01-06. Wholesale prices for coke and thermoanthracite, from 1-01- 1972. Price list .Nb 06-04. Wholesale prices for

asbestos, graphite and asbestos-cement products. M, Preyokuragg, 1967). One part of the samples is subjected to tests, the other part is tested after heating to 60-80 ° C during the day. The results of the study of the properties of the samples are given in the table. Example 5. The composition of the press composition (in%); Thermoanthracite71,5 Novolac phenol-formaldehyde resin 16.0 Ground graphite 10.0 Urotropin (hexamethylenetetramine) 1.8 Stearin0.6 To obtain a press composition of this composition, take thermoanthracite in grinding 1.2 mm, load together with the rest of the components into a ball mill and crushed to grain size less than 0.2 mm. The resulting mixture is rolled at a temperature of 130-140 ° C in the gap between the rolls of 0.5-0.8 mm. After rolling, the cooled mass is crushed to a particle size less than 0.8 mm .. From the prepared press composition by hot pressing at a specific pressures of 250 kg / cm are obtained samples. The temperature of the matrix is 170 ° C and the punch is 160 ° C. The pressing time is selected on the basis of the curing rate of 20 seconds per 1 mm of the product thickness. After curing, the samples are additionally subjected to heat treatment for 4 hours at 160 ° C. The results of the study are given in the table.