Antifrictional polymer composition with thermally expanded graphite

FIELD: chemistry.

SUBSTANCE: invention relates to an antifrictional polymer composition based on ultra-high-molecular-weight polyethylene, particularly for making friction bearings in mobile friction assemblies of machines and mechanisms. The composition contains ultra-high-molecular-weight polyethylene and an inorganic modifier, wherein the inorganic modifier used is thermally expanded graphite in amount of 2 wt %.

EFFECT: composition has improved deformation-strength properties, wear resistance and bearing capacity.

1 tbl

 

The invention relates to the field of polymeric materials, to receive antifriction polymeric compositions based on ultrahigh molecular weight polyethylene (UHMWPE) that can be used for the manufacture of plain bearings in the movable friction units of machines and mechanisms. The composition comprises ultra-high molecular weight polyethylene and inorganic modifier. As the inorganic modifier is thermal expanded graphite (TWG). The composition according to the invention allows to significantly reduce the intensity of the mass wear of the material.

The level of technology

Most modern structural materials based on polymer matrices impose requirements for strength and durability. In this regard, when creating composites it is necessary to select the components that have complex effect on the polymer matrix, providing the specified properties.

Known composite materials for the manufacture of bearings, mechanical seals and other elements of friction on the basis of ultra-high molecular weight polyethylene (UHMWPE) and inorganic fillers of different chemical nature (1. Andreev, I. A., Veselovskaya E. C., Nalivaiko E. I. and other ultra-high molecular weight high density polyethylene. - L.: Chemistry, 1982. - 80 C.). However, these materials shall have sufficient wear resistance and low strength properties.

Known composite material "Tielen" on the basis of ultra-high molecular weight polyethylene manufactured by THE 2211-001-98386801-2007 (2), which has a high frost resistance. From "Tirolina" manufactured articles for technical uses: sheets, plates, gears, high strength filaments, sports products - sliding surfaces of skis, snowboards, hockey rink, a medical product - details prosthetics and orthopedics. The disadvantage of the material is not sufficiently high wear resistance.

Known composition based on UHMWPE, ultra-β-Sialon and molybdenum disulfide (3. Adrianova O. A., Vinogradov A. C., Sheets C. M. Antifriction composition. RF patent №2126805. Application No. 5068151/04 from 14.08.1992. Publ. 27.02.1999; bul.№6). Having a high wear resistance, the material is characterized by insufficient strength, elasticity, load-carrying capacity, due to what can only be operated at low loads.

Known composition based on UHMWPE (4. Selyutin, E., Gavrilov, Y. Y., Popov O. E., Voskresenskaya, E. N., Poluboyarov C. A., Voroshilov C. A., Turyshev A. C. Composite wear-resistant material-based ultra-high molecular weight polyethylene. Patent RU 2381242 C2, IPC C08L 23/4, 15.04.2008) containing 4 wt.% nano-modifier, which is used or carbosil, or tungsten W 3or silicon carbide (SiC), or aluminum oxide Al2O3that has frost resistance, high resistance to abrasion and aliphatic hydrocarbons. Applied composition for facing mining and mining equipment, wear-resistant products for structural purposes, operating in the mode of abrasive wear in the environment of oil, oils, lubricants, fuels, acids and alkalis.

The disadvantages of the material include low strength, high cost of nano-modifiers, and the use of additional operations mechanical activation of components of the composite.

Known composite material (5. Selyutin, E., Gavrilov, Y. Y., Popov O. E., Voskresenskaya, E. N. The material for lining plates. Patent RU 2476461, C08L 23/06, C08K 3/22, B82B 1/00. 27.02.2013) obtained by mixing mechanically activated ultra-high molecular weight polyethylene and powder of aluminum oxide of Al2O3. Used aluminum oxide Al2O3two fractions with the size of 0.1 mm and 0.3 mm at a ratio of 1:2, in the total amount of 18% by weight of UHMWPE. In the invention of ultra-high molecular weight polyethylene (UHMWPE) activate mechanoactivated AGO-2C, which allows for the acceleration of the balls to 60 g to develop specific power up to 100 W/g, in this case, thanks to the water cooling temperature. what the fuck is regulated. During the activation of a molecular device UHMWPE changed without breaking intramolecular bonds. Due to the high plasticity of UHMWPE, the specific energy under mechanical activation is insufficient to break the C-C bond, but enough to change the packing of the hydrocarbon chains. Mechanical activation of UHMWPE provides a more effective intermolecular interaction and, consequently, increase the strength characteristics of products, improved frost resistance, resistance to impact material. In mechanically activated UHMWPE is introduced modifier powder of aluminum oxide (Al2O3) modification corundum two factions - the size of 0.1 mm and a size of 0.3 mm in a ratio of 1:2, in the total amount of 18% by weight of UHMWPE. Large particles of alumina powder (Al2O3) modification of corundum have extreme hardness; due to the high dosage they reinforce the activated matrix UHMWPE, resulting in significantly increased resistance to shock and wear plates for lining. The mixture of activated UHMWPE powder of aluminum oxide (Al2O3) was carried out in the cage mill of series "Base" DI 0,12. Having a high wear resistance, the material is characterized by insufficient strength, bearing capacity, due to what can only be operated when low is their loads. In addition, the process includes mechanical activation, which complicates the process of obtaining material.

Closest to the technical nature of the claimed material is the composition on the basis of UHMWPE with a synthetic spinel cobalt or copper as a modifier (6. Okhlopkova A. A., sits E. Y., Gogoleva O. C. Antifriction polymeric composition. RF patent №2296139. Application No. 20044114691 from 14.05.2004, publ. 27.10.2005 St). To obtain compositions in the source material was injected synthetic spinel cobalt or copper subjected to mechanical activation within 1-2 min in a planetary mill AGO-2 [E. Avvakumov, Soft mechanochemical synthesis // Chemistry for sustainable development. - 1994. - So 2, no. 2-3. - S. 541-559]. Mechanical activation of the filler is carried out with the purpose of obtaining uniform dispersion of the powder and increase the reactivity of particles of synthetic spinel, because the source material as the polymeric binder is characterized by inertness, low level of adhesion, which makes it difficult interfacial interaction in the composite and, therefore, hinders the processes of structure formation. Putting the estimated weight of the polymer and filler in the high-speed mixer, were mixed to obtain a homogeneous mass. Then from the composition did blanks of the desired shape according to the technology of cold pressing after the respective free sintering at a temperature of 180°C. Introduction to the source material synthetic spinel cobalt or copper, mechanically activated in a planetary mill, within 1-2 min, with the following ratio of components (wt.%):

synthetic spinel- 2,0
UHMWPE -the rest,

allows to obtain a composite material having a high wear resistance, load capacity, stable coefficient of friction and high strain-strength characteristics.

The composition according to the invention allows to increase the deformation-strength characteristics, wear resistance and load bearing capacity of the materials. The disadvantages of the material include high cost of synthetic spinel cobalt or copper.

This material is taken as a prototype.

The objective of the invention is to develop a wear-resistant composite material-based ultra-high molecular weight polyethylene for the manufacture of plain bearings in the movable friction units of machines and mechanisms while maintaining the strength properties of the original UHMWPE.

Technical result achieved in the implementation of the invention is to obtain a composite material having a high resistance to the East is Rania.

The problem is solved due to the fact that the composite material-based ultra-high molecular weight polyethylene further comprises a thermal expanded graphite (TWG). As an object of study that best meets the specified requirements, the selected SBME remaining to the present time the only polymer that is capable of storing mechanical properties, relatively low and stable coefficient of friction and ensure smooth gliding even at cryogenic temperatures.

The implementation of the invention

For studies used SUMLA production Tomsk petrochemical plant with an average molecular weight of 2.34 million (TU 221.-068-70353562-2006), physico-mechanical properties of which are shown in table.1.

As a modifier of UHMWPE used thermal expanded graphite (TU 2164-001-05015070-97) production company "Kasturba" (, St. Petersburg), which is having all the positive qualities of graphite, heat resistance, chemical resistance, low friction coefficient, which has the unique property - plasticity, which allows to produce products without imposing any binding.

We investigated the following ratio of components:

thermal expanded graphite- 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 wt.%,

UHMWPE - rest.

Before use as modify atora UHMWPE, thermal expanded graphite was subjected to grinding in a paddle mixer, followed by mixing it with powdered ultrahigh molecular weight polyethylene. The use of thermally expanded graphite allows complexity of technological operations to obtain a polymeric composite materials based on UHMWPE.

The resulting mixture is the source material from which the pressed samples for testing. The samples were obtained by hot pressing at a pressure of 10 MPa and a temperature of 180°C.

Were used the following methods of determining the properties of the composite:

The elongation and the tensile strength was determined according to GOST 11262-80 on the test machine "AGS-J" Shumadzu at room temperature and the speed of movement of the movable grippers 50 mm/min on the blades (the number of samples in one test - 5).

Tribological characteristics (intensity of mass of a composite wear) was determined when tested according to standard techniques (GOST 11629-75) on the machine friction CETR (USA). Used the scheme "thumb-drive" (sample - a column with a diameter of 10 mm, height 20 mm, the counterbody - steel shaft steel 45 with a hardness of 45-50 HRC and roughness Ra=0,06-0,07 mm, the load 150 N, sliding speed - 200 rpm). The test time is 3 hours.

To determine the mass wear of the samples was treated with ethyl, Sertoli weighed on an analytical balance before and after friction. After the treatment with ethyl alcohol, the samples were left for days in order to evaporate the alcohol.

In table.1 shows the values of the physico-mechanical and tribological characteristics of the claimed composition.

Example. 95,0 g UHMWPE and corresponding percentage, the number of thermally expanded graphite were mixed in a paddle mixer until a homogeneous mass. Then the composition was placed in a mold and extruded product by hot pressing at a pressure of 10 MPa and a temperature of 180°C.

As can be seen from the table, the best indicators of the intensity of mass wear rate obtained from the composition of UHMWPE with a 2% content of thermally expanded graphite in the claimed composition, the intensity of the weight wear at load 150N 35 times smaller than the prototype. At the same time managed the tensile strength in the claimed composition to improve compared with the prototype and the original UHMWPE.

Table 1
The composition and properties of antifriction polymeric composition with thermal expanded graphite
CompositionSTRG, wt.%εp, %σp, MPaIntensively the th mass wear mg/h (load 150 N)
UHMWPE0300300,86
1260360,23
2300350,23
32400,24
4230330,16
5220300,10
6220300,06
7210280,03
8210 270,03
9200220,03
10190210,03
The prototype UHMWPE+CoAl2O390328,1 (at a load of 150 N)
Where: εp- elongation, σp- tensile strength, E - modulus, f is the friction coefficient, STRG - number of thermally expanded graphite.

Antifriction polymeric composition based on ultrahigh molecular weight polyethylene containing inorganic modifier, characterized in that it contains as inorganic modifier thermal expanded graphite in the following ratio, wt.%:

thermal expanded graphite2,0
ultra-high molecular weight polyethylenerest



 

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