CS276646B6 - Sliding material for linear and rotational guiding of working mechanisms - Google Patents

Abstract

The sliding compound showing improved technological and technical properties, i.e. faster curing, higher hardness and therefore less wear, is processed on the basis of low-molecular unmodified epoxy resin with an epoxy mass equivalent of 188 to 200 g/mol, to which 34 to 48 parts by weight is optionally added - to improve spreadability - up to 12 parts by weight of medium-molecular softened epoxy resin with an epoxy mass equivalent of 280 to 350 g/mol containing dibutyl phthalate. The sliding property is enhanced by 0.5 to 3 parts by weight of molybdenum disulfide and 6 to 10 parts by weight of powdered graphite, while the strength of the compound is provided by mechanical iron powder with a grain size of up to 0.1 mm, in the amount of amount of 16 to 40 parts, whereby thickening, and thus the necessary thixotropic properties of the material are achieved by adding 15 to 34 parts by weight of powdered talc with a grain size also up to 0.1 mm. Before application, 3.4 to 4.8 parts by weight of diethylenetriamine are added to harden the material

Description

The invention relates to a lubricant for straight and rotational guidance of working mechanisms, processed on the basis of synthetic resin and additives influencing its sliding, strength and thixotropic properties.

The basic substance of these lubricants has hitherto been an epoxy resin prepared by the reaction of diane (4,4-dihydroxydiphenylpropane) and epichlorohydrin, to the curing of which diethylenetriamine was added. Amorphous, colloidal or lamellar graphite and especially molybdenum disulfide are always suitable as additives for influencing the sliding properties. The load-bearing capacity, ie the strength of these materials, is usually enhanced by the addition of metal powders, especially iron powder, mechanical with a grain size of up to 0.1 mm, and thixotropy is affected by the addition of mineral flours such as ground asbestos, kaolin, slate and talc. Even with these additional fillers or thickeners influencing the thixotropic properties, i.e. the conditions of application of these; of sliding materials on the components of working mechanisms, a grain size of up to 0.1 mm is required. Recently, lubricants without molybdenum disulfide have also appeared on the market as import components, while the sliding properties of the compound were then strengthened exclusively by graphite. There has also been a decline in the use of ground asbestos as a carcinogen.

However, all the lubricants thus folded have the disadvantage that they cure for a relatively long time; especially at lower temperatures, which results in increased work-in-progress and difficulties associated with machine parts, where these lubricants are applied to machine parts, especially in the cold and winter periods. For example, I cure these materials at 20 ° C in 24 hours until the workability phase and about 48 hours until the workability phase of the sliding surface. At a temperature of around 15 ° C, which is often common in workshop workplaces in the winter, both times are practically doubled. The second disadvantage of the existing lubricants is their hardness, which with its values of HB = 8 after curing and HB »18 after a year is quite low. It is necessary to consider that the harder such a sliding mass, the smaller its abrasion and the longer the service life of the sliding surfaces. Naturally, there are problems with the declining accuracy of the sliding guides 1, more frequent renovation of the sliding surfaces, as well as costs, including more frequent downtimes and thus losses in the production of working machines and equipment in whose mechanisms these sliding materials have been used.

The object of the invention is therefore to provide a lubricant with better performance, i.e. a composition having higher hardness and faster hardenability, which improved properties would substantially improve its quality and reduce the disadvantages and difficulties associated with the use of conventional lubricants.

According to the invention, this is achieved by a lubricant based on synthetic resin and additives affecting its sliding, strength and technological properties, which consists of 34 to 48 masses, parts of unmodified low molecular weight epoxy resin with epoxy mass equivalent to 188 to 200 g / mol with optional by adding up to 12 parts by weight of medium molecular weight softened epoxy resin with an epoxy weight equivalent of 280 to 350 g / mol containing dibutyl phthalate, 0.5 to 3 parts by weight of molybdenum disulfide, 6 to 10 parts by weight of graphite powder, 16 to 40 parts by weight mechanical iron powder with a grain size of up to 0.1 mm, 15 to 34 wt., parts of talc powder also of a grain size of up to 0.1 mm and 3.4 to 4.8 wt.%, parts of diethylenetriamine.

The sliding mass of this composition shows an progress in comparison with hitherto produced masses of this kind. First, it is based on unmodified low-molecular-weight epoxy resin, which cures diethylenetriamines faster per se, but to improve technological applications, especially in the extreme composition of a high thixotropy lubricant, where the spreadability deteriorates due to higher thickeners. by the addition of a medium molecular weight softened epoxy resin containing, dibutyl phthalate. The sliding properties of this material are ensured by its relatively low content with a relatively low availability of molybdenum disulfide, and its effect is supplemented by two to twenty times the amount of graphite powder. Although graphite reduces the hardness of the lubricant, the molybdenum disulfide content is so effective that together with the iron powder it is mechanically effective. gives the lubricant according to the invention a hardness of HB-14 after curing and HB = 26 after one year. >

CS 276 646 B6 2

Compared to values achieved in existing sliding weight is an improvement of 75% after cure and 44% after one year of operation- to this is naturally associated as well as higher wear resistance and therefore greater durability mass which of course přináéí substantial mitigation of technical and economic drawbacks, ^J which have been mentioned here in connection with existing sliding masses. In addition, the application of the composition according to the invention in its sparse consistency to the rotary casting of sliding bushes of machine parts reduces the technological consumption of time by a third to a quarter compared to existing compositions of this type, and this new sliding composition is also shortened in terms of curing time. time consumption to less than a quarter, as can also be seen from the technical data given at the end of the description of the present invention.

The practical solution of the composition of the lubricant according to the invention is given in three examples, one demonstrating a lubricant of thin consistency, one for the most commonly used consistency and one for non-drip consistency necessary for application on vertical, ceiling and considerably inclined sliding surfaces.

Example 1: '

Sliding material of thin consistency, usable, for example, for rotational casting of sliding bushes and repairs of straight sliding guides.

low molecular weight unmodified epoxy resin with wt.

epoxy equivalent 188 to 200 g / mpl (ChS epoxy 15) ......... 480g molybdenum disulfide ......................... ..... 10g graphite powder ........... 70g mechanical iron powder (MC 30 according to ČSN 41 8004) with grain size up to 0, T mm ............ .... 220g talc powder (type II / A) with a grain size of up to 0.1 mm .................... 220g

000 g

Example 2:

Sliding material of medium consistency with slight run-off for application on horizontal and slightly inclined sliding guides, possibly also * sliding breast and guide bushes.

low molecular weight unmodified epoxy resin with mass, epoxy equivalent 188 to 220 g / mol (ChS epoxy 15) ...... 340g medium molecular weight softened epoxy resin with mass, epoxy equivalent 280 to 350 g / mol with dibutyl phthalate content (ChS epoxi 1200) ....... 80g molybdenum disulfide .................... 10g graphite powder ................. .......................................... 70g mechanical iron powder (MC 30 according to ČSN 41 8004) with a grain size of up to 0.1 mm ............. 250g talc powder (type II / A) with a grain size of up to 0.1 mm .......... .................. 250q

000 g

Example 3:

- Sliding mass of thick consistency, non-draining on vertical and ceiling sliding surfaces.

unmodified low molecular weight epoxy resin with a mass, epoxy equivalent of 188 to 200 g / mol (ChS epoxy 15) ..................... 340g

CS 276 646 B6 medium molecular weight softened epoxy resin with a mass, epoxy equivalent of 280 to 350 g / mol containing dibutyl phthalate (ChS epoxy 1200) ....................... ............. 50g molybdenum disulfide ............... 10g graphite powder ................ ........................................... 70g mechanical iron powder ( MC 30 according to ČSN 41 8004) with grain size up to O _f l mm ............... 380g talc powder (type II / A) with grain size up to 0,1 mm ..... ....................... 150g

000 g

For curing, 34 to 48 g of diethylenetriamine (per total mass) are added to all three of these masses before application, then the mass is properly homogenized. Doses of molybdenum disulfide are below the limit here.

Technical data of the materials according to the invention:

mass ................................................. ... 1.5 to 1.9 g / cm workability ........... up to 70 min. after reconstitution with the curing agent.

curing time: at 20 ° C ................... 5 h until workability phase h until functional usability at 15 ° C ........... ........ 10 h to workability phase h to functional applicability strength vs shear under tensile load .................. min. 10 MPa compressive strength at a thickness of 1.5 mm ......................... min. 230 MPa temperature resistance ............................. -80 ° C to +80 ° C permanently, for a short time up to + 100 ° C resistance ...................................... water, oils, weak acids and alkalis, alcohol and similarly they do not ... resist acetone, perchlorstylene, chlorinated hydrocarbons and shelf life (without hardener). .......... 18 months

The preparation of the lubricant according to the invention does not differ from the preparation of previously produced masses of the same type. The conditions of its application are also similar to the materials known so far: it is a necessary mechanical treatment (roughening) of the surface of the metal part on which the material is applied; and its perfect degreasing. In particular, the sparse consistency of the composition according to the invention - due to its resistance to certain aggressive chemicals - can also be used as protection for metal tanks and large-diameter pipes.

Claims (1)

PATENT CLAIMS Glidant for straight and rotary guides of working mechanisms, based on synthetic epoxy resin and additives influencing its sliding, strength and thixotropic properties, for example molybdenum disulfide and graphite, metal powders, especially iron powder, mechanical and mineral thickeners, characterized in that consists of 34 to 48 wt., parts of unmodified low molecular weight epoxy resin with epoxy mass, equivalent to 188 to 200 g / mol with possible addition of up to 12 wt. CS 276 646 B6 softened epoxy resins with an epoxy mass, equivalent to 280 to 350 g / mol, containing dibutyl phthalate, 0.5 to 3 parts by weight, of molybdenum disulfide; 6 to 10 wt., Parts of graphite powder, 16 to 40 wt., Parts of mechanical iron powder with a grain size of up to 0.1 mm and 15 to 34 wt.%, Parts of talc powder also of a grain size of up to 0.1 mm and 3.4 to 4.8 mass, diethylenetriamine.