Composite powder filler manufacturing process

FIELD: composite materials.

SUBSTANCE: invention relates to a process of manufacturing composite powder filler for elastomer compositions designed for fabrication of articles operated under increased wear and dry friction conditions. Process resides in that titanium carbide particles are activated in a mechanochemical activator with mechanical energy supply intensity 1 to 5 kW/kg and dose 100 to 1000 kJ/kg in a medium selected from a series: air, nitrogen, argon, and vacuum at pressure from 10-2 to 1 atm until particles with average size not larger than 15 μm are obtained, after which high-pressure polyethylene is added to activator and titanium carbide particles are modified at mechanical energy supply intensity 0,05 to 0.5 kW/kg and dose 3 to 100 kJ/kg in a medium selected from a series: air, nitrogen, argon, and vacuum at pressure from 10-2 to 1 atm.

EFFECT: lowered coefficient of friction under dry friction conditions and reduced summary rate of wear of friction pair under hydroabrasive wear conditions.

1 tbl

 

The present invention relates to methods for the filler to the elastomer compositions intended for the manufacture of products, working in conditions of increased wear or dry friction.

Known fillers Vistamer Ti 911x, Vistamer Ti 9113, Vistamer Ti 9115, which are used to create durable products. These fillers include particles of titanium carbide-coated high-pressure polyethylene (US 6523835, AS 1/00, 2003, US 6642297, 08J 5/10, 2003), but the method of obtaining these fillers are not described in literature.

As a prototype of the chosen method of production of composite powder filler, which contains a single particle one core of inorganic material, for example of ceramic material coated with a layer of silicone elastomer. (GB 2244489, SC 9/06, 1991) is a Method of obtaining the specified filler includes obtaining reactive liquid, which is the product of the reaction of monofunctional siloxane and secondary multifunctional silane, bringing in the interaction of the inorganic material of ceramics and the resulting reactive liquid by stirring in a stirrer-mixer drum with the addition of solvent.

This method provides for producing composite powder filler in the shell from the liquid phase and use is the only siloxane coating and allows you to get the filler in the shell of the solid phase.

The present invention is a method of obtaining a composite powder filler in the form of titanium carbide in the shell of a solid phase, such as high-pressure polyethylene.

The method of obtaining the proposed composite powder filler is in the interaction of the particles of ceramic material and a polymer in which the particles of ceramic material in the form of titanium carbide activate in mechanochemical activator with the intensity of the supply of mechanical energy from 1 to 5 kW/kg and a dose of from 100 to 1000 kJ/kg in an environment selected from a number of: air, nitrogen, argon, vacuum pressure of 10-2to 1 ATM, to obtain particles with an average size of not more than 15 μm. Then the activator is injected polymer in the form of high-pressure polyethylene and modify particles of titanium carbide with the intensity of the supply of mechanical energy from 0.05 to 0.5 kW/kg and a dose of from 3 to 100 kJ/kg in an environment selected from a number of: air, nitrogen, argon, vacuum pressure of 10-2to 1 ATM.

The invention allows to obtain a composite powder filler containing a single particle of one or more cores, coated polyethylene under high pressure. The volume fraction of the cores on a single particle of the filler is 0.1-10%. The particle size of the filler is not more than 50 μm.

A method of obtaining a composite parashkevov the filler implemented as follows.

Particles of titanium carbide is placed in the working chamber of mechanochemical activator together with grinding bodies. Volume chamber, the volume of the grinding bodies, the dynamic characteristics of mechanochemical activator selected so as to ensure that the intensity of the supply of mechanical energy to the processed material. The activation process was performed at room temperature with the intensity of the supply of mechanical energy from 1 to 5 kW/kg in an environment selected from a number of: air, nitrogen, argon, vacuum pressure of 10-2to 1 ATM. The required dose summed mechanical energy in the range from 100 to 1000 kJ/kg is achieved by processing at a given intensity; as a result, activation receive particles of titanium carbide with an average size of not more than 15 μm.

Then after a boot device in the working chamber of the mechanical activator is injected pellets of high-pressure polyethylene with an average particle size up to 100 microns. The amount of polyethylene of high pressure should correspond to the volume fraction of polymer in the final product. Dynamic parameters of mechanochemical activator (frequency and amplitude) change in such a way as to ensure the intensity of the supply of mechanical energy to the processed material in the range of 0.05 to 0.5 kW/kg Required dose summed up fur the technical energy in the range from 3 to 100 kJ/kg is achieved by a sufficient duration of processing at a given intensity. The environment in which the processing of titanium carbide is selected from the series: air, nitrogen, argon, vacuum pressure of 10-2to 1 ATM.

As a result of processing particles of titanium carbide receive composite powder filler in the form of particles of titanium carbide in the coating of high-pressure polyethylene. In a single particle filler can be one or multiple cores.

As a matrix, use of a composition based on BNR, ethylene-propylene rubber, butyl rubber, fluorinated rubber.

The invention is illustrated by the following examples.

Globular powder of titanium carbide with a particle size of from 10 to 80 μm and an average particle size of 50 microns is placed in the working chamber of mechanochemical activator together with grinding bodies - a set of metal and/or agate balls ranging in size from 3 to 15 mm in diameter and activate the modes (the intensity of the supply of mechanical energy, the composition of the processing environment), which are listed in the table. As a result of activation to produce a powder of titanium carbide with an average particle size of which is given in the table. Through a boot device in the working chamber of mechanochemical activator impose additional granules of high-pressure polyethylene with an average particle size up to 100 microns. Characteristics of the process of modification of titanium carbide (intensity, to whom and for supplying mechanical energy to the processed material), as well as the processing environment shown in the table.

The obtained composite material was inserted in the rubber mixture based on butadiene-nitrile rubber SKN-26, full of technical carbon (120 parts by weight), it was molded workpiece and vulcanizable products. Samples obtained from the specified rubber mixtures containing composite powder filler and without it (control sample), were investigated on the machine end friction MTT-2 without lubrication (dry friction) and on the plant, simulating friction axial bearing stage submersible pump ESP.

Tests have shown that the introduction of composite powder filler in the rubber mixture leads to a decrease of the coefficient of friction under conditions of dry friction and to reduce the total wear rate of the friction pair in terms of hydroabrasive wear.

Proposed by the present invention a method of obtaining a composite powder filler allows you to get the filler in the form of titanium carbide in the coating of high-pressure polyethylene, in which the shell is deposited on the core of the solid phase.

Characteristics of the method of production of composite powder filler
# exampleThe intensity of the supply of mechanical energy, kW/K is Dose of mechanical energy, kJ/kgPressure, ATMThe average particle size, micronsThe resulting structure filler
When activatedWhen modificationsWhen activatedWhen modificationsWednesdayWhen activatedWhen modificationsAfter activationAfter modification
1234567891011
110,051003The air11530Powder filler in the sheath of HDPE
230,2550050Nitrogen111030Powder filler in the sheath of HDPE
350,5100010The vacuum 10-210-21550Powder filler in the sheath of HDPE
440,3750100Argon111015Powder filler in the sheath of HDPE

A method of obtaining a composite powder filler, which consists in the interaction of the particles of ceramic material and a polymer, characterized in that the particles of ceramic material in the form of titanium carbide activate in mechanochemical activator with the intensity of the supply of mechanical energy from 1 to 5 kW/kg and a dose of from 100 to 1000 kJ/kg in an environment selected from a number of: air, nitrogen, argon, vacuum pressure of 10-2to 1 ATM, to obtain particles with an average size of not more than 15 μm, after which the mechanical activator is injected polymer in the form of high-pressure polyethylene and modify particles of titanium carbide with the intensity of the supply of mechanical energy from 0.05 to 0.5 kW/kg and a dose of from 3 to 100 kJ/kg in an environment selected from a number of: air, nitrogen, argon, vacuum pressure of 10-2to 1 ATM.



 

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