CS259119B1 - Mass with high wear resistance - Google Patents

Abstract

The material is intended for the production of highly stressed sliding elements, manufactured at elevated temperatures by pressing, extrusion or injection molding. It is made on the basis of thermoactive binders and mineral fillers. It may contain separators, dyes and/or plasticizers. Per 100 parts by weight of thermoactive binder, e.g. phenolic, polyester, epoxy, diallyl phthalate, polyimide or melamine resin and hardeners and catalysts, it contains from 3 to 50 parts by weight of filler. The filler consists of technical fugitive dust silica with a narrow size distribution of spherical particles of up to 1/um, or their aggregates, in combination with sliding additives, e.g. graphite, molybdenum dioxide, Teflon, etc. in a ratio of 1:1 to 1:10, based on the content of the silica filler.

Description

The present invention relates to a material with high wear resistance, intended in particular for the production of high-stressed sliding elements produced at elevated temperatures by pressing, extrusion or injection molding. plasticizers.

AND

At present, a number of polymer composites consisting mainly of phenolic, polyiraid epoxy and other resins containing fillers increasing sliding properties are used for the production of sliding elements of electric rotating machines, car water pump seals, functional elements of textile machines, bearings etc. · Fillers are graphite , molyka, fluoroplastics, biscuit, slipper, mica, slate, etc. * The resulting physico-mechanical properties, shape stability under heat, wear resistance, water absorption and processing properties of these materials predetermine the second and the amount of fillers, polymeric filler used and its curing system, other ingredients, eg · lubricants, dyes, plasticizers, reinforcements, etc. · including process and processing conditions · Existing materials, however, do not show the required sealing effects or sufficient durability ·

The above-mentioned drawbacks are remedied by a high wear-resistant composition made on the basis of thermoreactive binders and mineral fillers, and optionally containing separators, dyes and / or plasticizers according to the invention, characterized in that it contains from 20 to 20 parts by weight of the thermoreactive binder. 300 parts by weight of filler consisting of technical fumed silica

- 2 and a narrow size distribution of spherical particles of up to 1 µm, respectively. their aggregates. The silica filler is contained in combination with glidants such as graphite, molybdenum trioxide, teflon, coke and the like in a ratio of 10: 1 to 1: 3 based on the silica filler content. The thermoreactive binder is preferably a phenolic, polyester, epoxy, alkyd, diallyl phthalate, polyimide or melamine resin with hardeners and catalysts.

The composition according to the invention exhibits high wear resistance while maintaining excellent sliding properties and substantially longer service life. Tests have shown that this effect has been achieved with a fine silica filler, i.e., a technical flux silica with a narrow particle size distribution of up to 1 µm, respectively. their aggregates. The above-mentioned requirements were fully complied with by the fumed silica produced in the production of pure silicon. The composition of the invention has been successfully tested for automotive water pump seals, where it has shown a significantly longer service life and sealing effect. When used on textile machine parts, in particular fiber guiding elements, it has exhibited significantly less wear compared to existing materials. At the same time, the filler according to the invention also improves the processing properties of the molding compositions, increases the surface smoothness of the moldings and reduces the wear of the mold inlet parts. The overall chemical composition of matter reduces technological shrinkage of matter. At the same time, the shape stability of the moldings increases and the risk of crack formation decreases. For the production of pressing, transfer and injection molding materials, it is possible to use a conventional production equipment, ie discontinuous and continuously operating kneaders, mixing rolls, etc.

The following are exemplary compositions of the composition according to the invention, by which the scope of the invention is not limited.

Example 1

The material for the production of the sealing rings of the electric submersible pumps was made in a laboratory double-cylinder of 200 x 400 mm. 1000 g of a phenolic novolak resin of m.p. 70 ° C, 120 g of powdered hexamethylenetetramine, 300 g of technical flue dust

3 silica with spherical particles having a particle size of up to 1 µm, or agglomerates thereof with a narrow particle size distribution, 300 g finely ground graphite, 500 g micronized slate, 30 g calcium stearate and 10 g magnesium oxide. After treatment for 30 minutes, the mixture was cut, cooled in air and ground to a particle size of up to 3 mm. H _m OTA was then treated at a temperature 170®0 injection and pressure of 100 to 120 MPa.

Example 2

The molding material for the production of the sealing rings for automotive water pumps was made in a 6-liter mixer. 300 g * of molten technical 4,4 diaminodiphenylmethane heated to 95 to 100 ° 0 was added to 1000 g of Dian-type low-molecular-weight epoxy resin heated to 40 to 50 ° C and 20 g of zinc stearate, 700 g of technical flux silica were gradually added. with a narrow particle size distribution of up to 1 µm, respectively. their aggregates, 500 g of finely ground graphite and 1000 g of ground coke of particle size up to 40 µm. After complete kneading at 35-45 ° C for 20 minutes, the mixture was tipped into separate metal trays and after cooling and pelletizing for 20 to 2500/48 hours, grinded to a molding mass of maximum 2 mm grain size. The mass was processed by pressing at 150 ° C at 150 MPa and curing time of 1 min / lmm thickness. High durability and sealing effect have been demonstrated during application.

Example 3

The material for the functional parts for guiding the cotton fibers of the spinning machines was made in a 6 liter mixer. Up to 1000 g of isophthalic-type polyester resin initiated by one mass. dílem tero. 1000 g of technical fused silica with a narrow particle size distribution of up to 1 µm or aggregates thereof, 1400 g of micronized slate, 1200 g of micronized limestone, 200 g of graphite and 30 g of zinc stearate were successively mixed with butyl perbenzolate. After mixing the mixture for about twenty minutes of kneading, the material was tipped and spread out on tin pans. The dough was then pressed and extruded. In functional use, the components showed excellent performance, especially in terms of wear on the sliding edges.

Claims (2)

to the invention 1 · High abrasion resistance mass β, intended for the production of highly stressed sliding elements, made on the basis of thermoreactive binders and mineral fillers, possibly containing separators, dyes and / or plasticizers, characterized in that it contains from 20 parts per 100 parts of thermoreactive binder 300 parts by weight of a filler consisting of a technical fitter with silica dust with a narrow particle size distribution of up to 1 µm in size, in combination with lubricants such as graphite, molybdenum trioxide, teflon, coke, etc. ratio 10sl to 1: 3 based on the silica filler content as the base · 2. A composition according to claim 1, wherein the thermoreactive binder is a phenolic, polyester, epoxy, alkyd, diallyl phthalate, polyimide and melarain resin with hardeners and catalysts.