Polymer composition for extremely severe operating conditions, sealing device for flexible and fixed joints, diaphragm and method of making polymer articles for pneumatic braking systems of railway vehicles

FIELD: chemistry.

SUBSTANCE: invention relates to production of industrial rubber articles which are used in conditions with heavy mechanical loads, friction, aggressive media and severe climatic conditions and can be used to make sealing devices for flexible and fixed joints of the type of rings, cuffs and linings, as well as for making actuating devices for membrane converters of pressure changes into linear displacements and components of braking systems of railway vehicles. The polymer composition contains the following components in pts. wt: paraffin butadiene nitrile rubber 90-100, butadiene methylstyrene rubber 0-10, technical sulphur 0.5-1.5, tetramethylthiuram disulphide 1-2, N,N'-dithiodimorpholine 1.5-2.5, N-cyclohexyl-2-benzthiazolyl-sulphenamide 1.0-2.5; zinc oxide 4-8, phenyl-β-naphthylamine 0.5-2.5, technical carbon 100-150, dibutylphthalate 20-40, dibutyl sebacate 20-40 and stearic acid 0.5-2.5.

EFFECT: invention enables to obtain articles which can work in aggressive media at temperature as low as minus 60°C, are stable under periodic dynamic loads and have high operational reliability and a guaranteed long useful life.

6 cl, 2 tbl, 3 ex

 

The invention relates to the production of rubber technical products, which are operated under high mechanical loads and friction, corrosive environments and harsh climatic conditions and can be used in particular for the manufacture of a variety of sealing devices movable and immovable joints type rings, seals, gaskets, and also for manufacturing of actuators diaphragm transducers pressure changes in linear motion and other products used, for example, in brake systems of railway rolling stock.

Famous oil-resistant rubber (polymer) composition, including on BNR rubber; sulfur; Altex; N-cyclohexylbenzothiazole sulfenamid; stearin; intercommunale resin; zinc white; dibutylsebacate or dibutyl phthalate; carbon black; oligomer; trimethyl-1,2 dihydroquinoline; dianilide (4-phenylaminopropyl)thiophosphorous acid and 2,4,6-tri-(dibutylamino)phenol [description of the invention to the patent of Russian Federation №2166519 from 12.07.1999, IPC7C08L 9/02, C08K 13/02, publ. 2001.05.10]. The composition has high heat resistance and dynamic endurance.

However, the combination of these ingredients does not provide a sufficient degree of frost resistance, which limits the use of these compositions for manufacturing the mould is increasing, for example, the sealing device of the brake system.

Known rubber compound (polymer composition), including rubber, butadiene-nitrile brand BNKS-40 AM, AMN, thiuram "D", N, N'-dithiodimorpholine, sulfenamid "C", naphthas, 2-deafen-OP, zinc, rosin, chalk of MOR, MMS-1, carbon black grades P-701 P-514, and dibutyl phthalate. In addition, the mixture can include factis Agris RO and oil industrial 8A [Descriptions of inventions by patents of the Russian Federation No. 2232171 and No. 2232172 from 2002.12.24, IPC7C08L 9/02, C08K 13/02, publ. 2004.07.10]. Mixtures have improved physical and mechanical properties and is most fully manifest their properties when used as an acoustic coating.

The disadvantage of such mixtures is the low oil and gasoline, which are not required in the design of such specific coverages, like an acoustic.

Known rubber compound (polymer composition), including rubber nitrile butadiene brands BNX-AM, BNX-ANN and hydrogenated brand BNCW 4030, Turban; sulfur; sulfenamid M; Altex; stearic acid; rosin; deburocratisation; white carbon black; zinc white; deafen FP; carbon black P-803; carbon black P-245; modifier RU-D or polyamide and aramid fiber [description of the invention to the patent of Russian Federation №2309962 from 2006.07.19, IPC7C08L 9/02, C08K 3/04, 3/06, 3/22, 3/36, 5/09, 5/17, 5/18, 7/02, 13/02, publ. 200711.10]. Lip seals made from this mixture used on oil equipment in the conditions of aggressive oil environment, the helical motion provoking raster of vulcanizates, and capable of withstanding low temperatures to minus 40°C.

Known rubber compound (polymer composition) to obtain frost, abrasion, oil-resistant rubber for sealing parts moving parts of mechanisms containing butadiene-nitrile rubber; sulfur; N1N1-diphenylguanidine; di-(2-benzothiazolyl)disulfide; zinc oxide; aldol-α-N-(4-hydroxy-phenyl)naphtylamine-2; N-(1,3-dimethylbutyl)-N1-phenylenediamine-1,4; carbon P; stearic acid; dibutyl phthalate; molybdenum disulfide; β-Sialon and fluoroplastic - 4 MB [description of the invention to the patent of Russian Federation №2125068 from 1996.12.24, IPC6C08L 9/02, C08K 13/02, 13/02, publ. 1999.01.20]. Vulcanizer has a friction coefficient of 1.06 and a temperature limit of fragility minus 55°C.

In case of replacement of molybdenum disulfide; β-Sialon and fluoroplastic - 4 MB ultrafine almatadema powder (UDAG) rubber mixture according to the patent of Russian Federation №2125068 improves their upregulations characteristics while maintaining a high frost resistance, hardness and low residual deformation after heat aging [description of the invention to the patent of Russian Federation №2129132 from 1996.12.24, IPC6C08L 9/02, C08K 13/02, published the. 1999.04.20]

Known rubber compound (polymer composition) based on butadiene-nitrile rubber, which contains anti-friction additive powder PTFE f-32LN; sulfur; Altex; zinc white; diphenylguanidine; aldol-α-naphtylamine; Newson D; chimney soot; dibutylsebacate; santoflex IP; and stearic acid [description of the invention to the patent of Russian Federation №2266930 from 2003.12.24, IPC7C08L 9/02, C08L 27/24, C08K 13/02, C08K 3/04, 3/06, 3/22, 5/09, 5/10, K5/18, 5/31, 5/372, publ. 2005.12.27]. The predominant use of mixture - the seal moving parts of equipment requiring increased durability, especially in aggressive environments, a small coefficient of friction and extended life.

The closest to the essential features of the technical solution for the inventive polymer composition is a composition having the following composition, parts by weight: rubber butadiene-nitrile profinity BNX-18A(EN) 60-80; rubber nitrile butadiene profinity BNX-40A(NA) 20-40; sulfur 1,0-2,5; N-N'-dithiodimorpholine 0,5-2,5; N-cyclohexyl-2-benzothiazolylsulfenamide 0,5-2,5; tetramethylthiuramdisulphide 0,5-1,0; zinc oxide 5-10; poly-2,2,4-trimethyl-1,2-dihydroquinoline 1,0-3,5; N-phenyl-N'-isopropyl-p-phenylenediamine 1-3; paraffin oil 0,5-3,0; carbon technical P-803 100-120; carbon technical P-324 6,5-20,0; dibutylsebacate 22,5-28,0; Starinov the Yu acid 0,8-2,0 and N-nitrosodiphenylamine 0,5-1,0 [description of the invention to the patent of Russian Federation №2165440 from 1998.05.05, IPC7C08L 9/02, C08K 13/02, publ. 2001.04.20]. The composition may be used for the manufacture of rubber products such as o-rings to field pipelines that require improved physico-chemical and mechanical properties. In particular, the temperature limit of the fragility of such rubber reaches minus 54°C.

The disadvantages of this composition should include insufficient low temperature limit of fragility and low resistance to periodicals, including cyclic dynamic loads, which makes it impossible to use it in products that are operated in harsh climatic conditions and aggressive environments, and to meet increased demands on operational reliability.

The task of the first invention group of the claimed technical solution, and obtain a technical result is to create polymer compositions used for the manufacture of products, working in aggressive environments at temperatures up to -60°C, stable when exposed to periodic dynamic loadings and high operational reliability and a guaranteed long life that will enable their use, in particular, in the construction of pneumatic brake systems of railway vehicles operated in Slonimsky conditions, due to frequent and large temperature fluctuations.

To solve the problem and achieve the stated technical result in the well-known polymeric composition comprising a butadiene-nitrile profinity rubber, sulfur technical, tetramethyl-turondale, N-cyclohexyl-2-benzothiazolylsulfenamide, N,N'-dithiodimorpholine, zinc oxide, stearic acid, carbon black and dibutylsebacate, the composition uses rubber with low content of Acrylonitrile and optionally includes N-phenyl-β-naphtylamine and dibutyl phthalate, and, in addition, includes optional butadiene-methylstyrene rubber in the following ratio of components, parts by weight:

1,0-2,5
Rubber nitrile butadiene
profinity90,0-100,0
Butadiene-methylstyrene rubber0-10,0
Technical sulfur0.5 to 1.5
Tetramethylthiuramdisulphide1,0-2,0
N,N'-dithiodimorpholine1.5 to 2.5
N-cyclohexyl-2-benzothiazolylsulfenamide
Zinc oxide4,0-8,0
Phenyl-β-naphtylamine0,5-2,5
Carbon technical100,0-150,0
Dibutyl20,0-40,0
Dibutylsebacate20,0-40,0
Stearic acid0,5-2,5

In addition:

a mixture of rubbers shall include a combination of their grades: nitrile butadiene parafango rubber - BNKS-18, and butadiene-methylstyrene rubber - SKS-10 RCP;

as the carbon black composition includes the combination of its brands N-330 and P-803 in the following ratio, parts by weight:

Carbon technical grade N-33050,0-75,0
Carbon technical grade P-80350,0-75,0.

There is a whole class of special devices that serve to prevent or reduce leakage of liquids, vapors or gases through the gaps between the parts of machines and structures, as well as protecting parts of machinery or premises from dust, dirt, moisture. Various who have the seal with a fixed contact strip, cords, plates etc) and seal with a movable contact (glands, cuffs, and others). For the manufacture of seals are used, in particular rubber (rubber compound) and other materials [New Polytechnical dictionary / CH. edit Awesone. - M.: Great Russian encyclopedia, 2000. - S, the term "seal"]. Thus, the seal is a device that prevents leakage of liquids, vapors or gases through the gaps between the parts [Zakharov BV, Kireev B.C. and Yudin DL Explanatory dictionary of mechanical engineering. Basic terms. - M.: Eng. lang., 1987, s]. For example, the annular seal is a device for sealing an annular contact is made in the form of a ring, and so on

A typical design of the sealing device movable and immovable joints are described in detail in a variety of reference literature [Yuriev Century. And. Guide designer-mechanical engineer: 3 so V.3. - M.: Mashinostroenie, 1979. - S-224]. In General, the sealing device includes at least one provideproperty element with a continuous contact surface for engagement with the sealing parts. Depending on the type of equipment used, using the appropriate seal and conditions to the material of sealing devices are subject to certain, often quite strict requirements, in the example, frost, reliability, and other

The task of the second invention group of the claimed technical solution, and obtain a technical result is to create a sealing device movable and immovable joints, working in aggressive environments at temperatures up to -60°C, stable when exposed to periodic dynamic loadings and high operational reliability and a guaranteed long life that will enable their use, in particular, in the construction of pneumatic brake systems of railway rolling stock operating in difficult climatic conditions associated with frequent and large temperature fluctuations.

To solve the problem and achieve the stated technical result in the known sealing device movable and immovable joints, including at least one provideproperty element with a continuous contact surface for engagement with the sealing parts, provideproperty element is made of a polymer composition according to the first invention group.

There is also a class of special devices, diaphragms or membranes), is intended for separating two cavities with different pressures or the Department of zamknutosti of the total volume, to convert pressure changes in linear motion and Vice versa, etc. [New Polytechnical dictionary / CH. edit Awesone. - M.: Great Russian encyclopedia, 2000. - s, the term "aperture", s, the term "membrane"]. In General, the aperture includes a thin providepulmonary plate closed, mostly landing ring portion and a deformable surface. Similarly, the sealing devices of the mobile and fixed connections to the material of the diaphragms are the same stringent requirements, for example, frost, reliability, and other

The task of the third invention of the claimed technical solution, and obtain a technical result is to create diaphragms, working in aggressive environments at temperatures up to -60°C and has high operational reliability and a guaranteed long life that will enable their use, in particular, in the construction of pneumatic brake systems of railway rolling stock operating in difficult climatic conditions associated with frequent and large temperature fluctuations.

To solve the problem and achieve the stated technical result in the diaphragm comprising a thin providepulmonary plate with zamknutym, mainly circular planting area and work surface, provideproperty plate made of a polymeric composition according to the first invention group.

A known method of manufacturing a rubber compound based on butadiene-nitrile rubber to obtain a thin-walled rubber articles such as membranes and other [description of the invention to the patent of Russian Federation №2298566 from 2005.07.13, IPC C08J 3/20, C08L 9/02, C08K 3/04, 3/22, 5/09, 5/11, 5/40, 5/44, publ. 2007.05.10]. How is that on mixing rollers in sequence in a lump sum or in stages introduce the components of the mixture, and mix them several times within a certain time is passed to the thin gap, followed by the slice. The proposed blend mode allows you to prevent agglomeration and to achieve uniform distribution of the components in the rubber mixture improves its technological properties in the production process (method of manufacture) rubber and reduces the rejection thin-walled articles by the presence of inclusions.

The disadvantages of the method include the possibility assumptions of marriage in rubber products. There are sectors of economic activity, where such products cannot be used in principle, for example, in the transport sector, in particular in the brake system of the railway rolling stock - in their actuating mechanisms, various sensors, etc.

The task of the fourth invention group of the claimed technical solution, and obtain a technical result is to create a special method of manufacturing polymer products, working in aggressive environments at temperatures up to -60°C, stable when exposed to periodic dynamic loadings and high operational reliability and a guaranteed long life that will enable their use, in particular, in the construction of pneumatic brake systems of railway rolling stock operating in difficult climatic conditions associated with frequent and large temperature fluctuations.

To solve the problem and achieve the stated technical result in the method of manufacturing polymer products for pneumatic brake systems of railway rolling stock, comprising preparing a polymer composition according to the first invention group and the molding, the polymer composition is subjected to trenirovki and shaping is done by injection molding.

Polymer composition for particularly difficult operating conditions, prepared in accordance with the first invention group, includes butadiene-nitrile paraventrinary, sulfur technical, tetramethylthiuramdisulphide, N-cyclohexyl-2-benzothiazolylsulfenamide, N,N'-dithiodimorpholine, zinc oxide, stearic acid, carbon black, dibutylsebacate, the composition further includes N-phenyl-β-naphtylamine and dibutyl phthalate and, in addition, includes optional butadiene-methylstyrene rubber in the following ratio of components, parts by weight:

Rubber nitrile butadiene
profinity90,0-100,0
Butadiene-methylstyrene rubber0-10,0
Technical sulfur0.5 to 1.5
Tetramethylthiuramdisulphide1,0-2,0
N,N'-dithiodimorpholine1.5 to 2.5
N-cyclohexyl-2-benzothiazolylsulfenamide1,0-2,5
Zinc oxide4,0-8,0
Phenyl-β-naphtylamine0,5-2,5
Carbon technical100,0-150,0
Dibutyl20,0-40,0
Dibutylsebacate20,0-40,0
Stearic acid0,5-2,5

The properties of the composition can be changed, thereby improving its performance. For this purpose a mixture of rubbers shall include a combination of their special marks: for nitrile butadiene parafango rubber - BNKS-18, and butadiene-methylstyrene rubber - SKS-10 RCP, and as carbon black composition includes the combination of its brands N-330 and P-803 in the following ratio, parts by weight:

Carbon technical grade N-33050,0-75,0
Carbon technical grade P-80350,0-75,0.

The sealing device movable and immovable joints made according to the second invention include at least one, made of the aforementioned resin composition provideproperty element with a continuous contact surface for engagement with the sealing parts. Such devices are a variety of pads, including shaped seals, rings, cuffs and other items shown, for example in the Handbook designer-mechanical engineer VI Anureva (see above).

The diaphragm (membrane)made according to the third invention group, include a thin, made of the aforementioned resin composition providepulmonary plate closed, mostly circular planting area and work surface. Diaphragms are widely used in the construction of pressure gauges, pressure sensors, regulators, diaphragm pumps and other products (see related literature on products, manuals and technical dictionaries, such as the New Polytechnic dictionary / CH. edit Awesomse p.142, the term "diaphragm pump" and others).

A method of manufacturing polymer products for pneumatic brake systems of railway rolling stock, implements the fourth invention, includes the preparation of the above-mentioned resin composition and molding, while the polymer composition is subjected to trenirovki - forced-pushing, for example, using worm filter machines, through a special grid with small holes [see, for example, Kornev A.E., three-dimensional A.M., Semerdjiev O.N. Technology elastomeric materials: the Textbook for high schools. - M.: "NPPA "Expired", 2005, s], and shaping is done by injection molding (see ibid., s).

Analyze the essential features of the invention.

As ka is Chuck composition (mixture) include unsaturated profinity butadiene-nitrile rubber. Due to its high resistance to the action of oils and other aggressive agents while maintaining the strength and elastic properties of rubber on its basis are widely used for manufacturing various oil - and petrol-resistant rubber products, gaskets, seals, sleeves, banttari, etc. It is most appropriate rubber for the case of the use of products based on it, in a fixed static conditions, for example, for static seals and driving conditions with overcoming external forces (seal movable joints) and internal (alternating stress on the limits of elastic deformation) of friction.

As the vulcanizing agent used sulfur technical. It is traditionally used as a vulcanizing agent for unsaturated rubbers and attractive for its low cost, relative availability, used technologies for use in obtaining a variety of rubber compounds. In addition, the inclusion in the composition of the mixture of tetramethylthiuramdisuphide, N-cyclohexyl-2-benzothiazolylsulfenamide and N,N'-dithiodimorpholine in combination with sulfur additionally stimulates the vulcanization process. Their effect is manifested in the fact that the first two substances are accelerators of the vulcanization of very high activity. In the processing of rubber with the art, containing accelerators class terrasolid prone to podocarpaceae and application sulfenamide accelerators provides resistance to podocarpaceae even when intensive methods of processing (hereinafter, physico-chemical properties of the ingredients are quoted according to the edition Kornev A.E. and other Technology elastomeric materials - see above).

Using tetramethylthiuramdisuphide, N-cyclohexyl-2-benzothiazolylsulfenamide and N,N'-dithiodimorpholine as additional curing substances, contributes to the improvement of physical-mechanical characteristics of the resulting polymeric composition, such as a conventional tensile strength, elongation at break, the relative deformation of the compression and durability.

In the rubber mixtures of stearic acid is a technological additive multifunctional actions. It activates the vulcanization, and promotes better dispersion of powdered ingredients that is caused dipolnym the nature of their molecules and surface-active properties.

Thus, the use in the composition of tetramethylthiuramdisuphide, N-cyclohexyl-2-benzothiazolylsulfenamide, N,N'-dithiodimorpholine and stearic acid provides such technological properties, such as:

- receipt of vulcanizates with high voltages PR is certain movements, very high strength, elastic, and dynamic properties, good resistance to ageing;

- obtaining a homogeneous structure of products;

- reduction of the duration of the curing process and reduce wear and tear of equipment;

- reduction of energy intensity of the process of preparation of compositions and products on its basis;

- reduce the viscosity and improve the workability of the rubber mixtures.

Zinc oxide, more commonly known as zinc white, in this composition is a vulcanization activator, and a thermally conductive filler. Introduction in the composition of the mixture provides qualitative spatial grid during vulcanization products and increases its resistance.

Phenyl-β-naphtylamine provides in the composition resistance to dynamic stress for a long time.

Carbon black is traditionally acts as a filler that increases the strength characteristics of the mixture. In the composition carbon black may include a combination of such brands as N-330 and P-803. This helps to ensure high strength characteristics and further improve this technology mix, as processability.

Dibutyl phthalate in the composition traditionally provides its frost resistance, as well as dibutylsebacate the NAT, but in combination they give a mixture of supermasochist - products do not lose their operational properties at temperatures down to minus 60°C. At such low temperatures many materials, including metals, lose some of their physical properties.

It should be noted that a further increase in frost resistance of the composition and further reducing the operational temperature outside is minus 60°C is possible, but it is limited to the same opportunities contact environments. For example, the lower temperature limit health sealing devices of mobile connections in pneumatic brake systems national railway rolling stock meets state standards and is limited by the size of minus 60°C and it is connected with a temperature limit health grease GT-L (TU CT), which is also limited by the temperature of -60°C. Beyond this temperature the grease loses its performance and, for example, acquires in relation to the rubber properties of the abrasive.

Additional inclusion in the composition of the mixture of butadiene-methylstyrene rubber improves the elasticity of the vulcanizate at low temperatures. Moreover, butadiene rubbers have a low cost, and adding them to the mixture lowers the cost of the target product.

The mixture is erecycling rubbers includes the combination of their brands: nitrile butadiene parafango rubber BNKS-18, and butadiene-methylstyrene rubber - SKS-10 RCP with a small content of bound styrene. It additionally allows you to increase the frost resistance of finished products, while maintaining sufficient resistance to aggressive environments. In addition to these rubber stamps can be used other brands, such as butadiene-nitrile parafango rubber it is BNX-15, BNC-28, BNKS-40 and others, butadiene-methylstyrene rubber - SMS-27 AMIS, SKMS-30 AMIS and others with established domestic and foreign technological regulations the amount of the corresponding organic acid. Their use should be recalculated percentages of rubber components, for example, when replacing BNKS-18 BNX-28 last you need to take to 1.55 times less when replacing SCMS-10 RCP on SCMS-27 AMIS - 2.7 times less, etc. it should be noted that the use of new brands of nitrile butadiene parafinnic rubbers may lead to partial loss of uprugoopticheskii properties (for BNX-15) or resistant properties (for BNX-28, BNKS-40). Also, to partial loss of cold-resistant properties may result in the use of new brands butadiene-methylstyrene rubbers (for SMS-27 AMIS, SKMS-30 AMIS).

The above-mentioned polymer composition may be used in the manufacture of rubber responsible is pecifications product type sealing devices and diaphragms, used, for example, in pneumatic brake systems of railway rolling stock [see, for example, Osadchenko V.R. Automatic brake rolling stock: textbook for universities W.-D. transport. - M.: the Route, 2006. - 392 S.], where special attention is paid to the reliability of the equipment in difficult climatic conditions, related, in particular, with large temperature differences.

To ensure the highest reliability of brake systems, the sealing device movable and immovable joints and the diaphragm must be made by a special technology, excluding any structure heterogeneity of the mixture and the presence of even the smallest foreign inclusions. This state provide a mixture by mnogostadiinost manufacture and operation of its trenirovki. For most rubber products this operation may be considered excessive, but in the manufacture of products, in particular for pneumatic brake systems of railway rolling stock it is necessary because at the final stage of preparation of compositions only it guarantees the absence of random foreign inclusions and, as a consequence, the required durability of the products. Only after that the mixture is subjected to the introduction of highly active vulcanizing group (sulfur technical and those whom repetitiously) and subsequently, the molding. To further ensure the highest possible quality products from all types of molding applied molding under pressure.

Thus, as essential features songs from the most generalized case to the more specific you can get the maximum manifestation of its required operational characteristics. The same applies to the manufacturing of the target products - implementation of all technical solutions, part of the polymeric composition required composition, its preparation for molding and molding by injection molding, allow to obtain products that are most suitable for use in air brake systems of railway rolling stock.

Polymer composition with desired chemical and physical-mechanical properties is obtained by a combination of different quantitative ratios of ingredients.

The upper limit of the content of the butadiene rubber-nitrile parafango provides high strength characteristics, the lower limit of the content of the specified rubber in combination with an upper limit of the content in the composition of butadiene-methylstyrene rubber ensures a high frost resistance.

Quantitative limits sulfur technical, tetramethyluronium the IDA, N-cyclohexyl-2-benzothiazolylsulfenamide and N,N'-dithiodimorpholine depend on the quality indicators used filler is carbon black.

Using the minimum and maximum number of stearic acid allows you to adjust the composition, ensuring the quality of the mixing process.

The maximum content of zinc oxide provides maximum heat resistance of the products obtained. Minimum - ensures the stability of their quality under conditions more relevant the usual (or normal).

Quantitative limits phenyl-β-naphtylamine provide in the composition is more or less expressed the safety properties of products in a dynamic operating conditions, therefore, for the manufacture of a sealing device fixed connections can be limited to a lesser amount of substance.

Different amounts of carbon black, as well as the combination of certain brands, enables a very good technological properties of the mixture in combination with high or maximum level of strength characteristics of the target products.

The minimum and maximum number of dibutyl phthalate and dibutylsebacate help maintain elasticity at low and very low temperatures to operate the range.

In accordance with the received physical and mechanical properties of rubber compound and features further shaping future products last acquire such properties at optimum cost required to provide specific operating conditions performance characteristics, up to the maximum. For example, in brake systems of railway trains operated in countries with hot and humid climate of the used rubber technical products with specific physical and mechanical properties, where high frost resistance will be redundant function, etc.

The process of manufacture of rubber compounds in General is typical and includes two characteristic stages. At the first stage in a typical mixer PC-71/12 sequentially injected rubber, chemicals, fillers, softeners. The components are mixed in a closed volume at a temperature of 80-100°C for 20-25 minutes. The resulting mixture is discharged and cooled for 5-6 hours. After a specified time made by the standard technology rubber compound without highly active vulcanizing groups are trenirovki. Treated rubber mixture is cooled. The cooled mixture having a temperature no higher than 30-40°C, placed in a typical mixing rollers. Starts vtoro the stage of getting a rubber mixture. At this stage, on rollers, prefabricated injected sulfur technical and tetramethyl-turondale. Thereafter, the composition is fed to the next process operation, injection molding, with its subsequent vulcanization in the form.

The values of the physico-mechanical properties of the polymer composition is summarised in Table 1. In particular, they meet the requirements of the Russian standards for brake systems of railway rolling stock.

Processes for the production of rubber compounds with different physical and mechanical properties consider the following examples.

Example 1.

Standard technology composition is prepared having the composition, parts by weight:

Rubber nitrile butadiene profinity brand BNKS-18 on THE other 38.30313-2006 - 100.

Technical sulfur according to GOST 127.4-93 - 1,05.

Tetramethylthiuramdisulphide according to GOST 740-76 - 1,54.

N,N'-dithiodimorpholine on THE 6-14-321-86 - 2,09.

N-cyclohexyl-2-benzothiazolylsulfenamide on THE 2491-055-05761637-2001 - 1,85.

Zinc oxide according to GOST 202-84 - 6,15.

Phenyl-β-naphtylamine according to GOST 39-79 - 1,54.

Technical carbon, for example, grades P-324 according to GOST 7885-86 - 129,23.

Dibutyl according to GOST 8728-88 - 30,77.

Dibutylsebacate according to GOST 8728-88 - 33,85.

Stearic acid according to GOST 6484-96 - 1,54.

The result is a polymer composition, the unique properties of which are presented in Table 2 - examples is 1.

Example 2.

For the manufacture of rubber compounds take the same components as in Example 1, except rubber, butadiene-nitrile parafango brand BNKS-18 on THE other 38.30313-2006, the number of which should be 90 parts by weight, the mixture is further added 10 parts by weight of butadiene-methylstyrene rubber stamps SCMS-10 CPG on THE 38.40365-97.

The result is a polymer composition, the unique properties of which are presented in Table 2 - example 2.

Example 3.

For the manufacture of rubber compounds take the same components as in Example 1, except carbon black, which are taken as a combination of its brands - N-330 according to ASTM D1765 and P-803 according to GOST 7885-86, - 50, and 75 parts by weight, respectively.

The result is a polymer composition, the unique properties of which are presented in Table 2 - example 3.

As mentioned above, obtained according to any one of examples 1-3 composition at certain stages being trenirovki, then by injection molding, for example, screw-plunger molding obtain the target product - sealing devices (rings, seals, gaskets, and other) and/or aperture, the minimum thickness of the array which may be 0.25 mm or even less.

The production of polymer products for pneumatic brake systems of railway rolling stock met the house screw-plunger molding has advantages, which are as follows:

- product design occurs in zamknutoi the mold,

the pressure created in the mold remains constant during vulcanization, the product obtained monolithic and accurately reproduce the cavity of the mold,

- improving the uniformity of heating of the workpiece and thereby the quality of the vulcanized product.

Examples of configurations of sealing devices, such as pads (including fittings), rings, cuffs, etc. and examples of the design of the diaphragm (or membrane) are widely represented in the reference literature (see prior art) and the catalogues of manufacturers. These products are part of special devices, such as pneumatic brake system of railway rolling stock [see the book of Osadchenko V.R. - Automatic brake rolling stock], running in specific conditions, characterized as severe. The manufacture of these products from the above-mentioned composition allows them to acquire unique properties for working in particularly difficult conditions, as reflected in their legend and/or marking. For sealing devices are, as a rule, the type of sealing device, the size of the sealing surface, the natural size of the group is exactly the group of polymeric compositions and the reference to the normative-technical document, where specifies the special conditions. For diaphragms, as a rule, its own name, standardized designation, dimensions, group of the polymer composition, its brand and the link to the normative-technical document.

During the operation of the above devices operate in accordance with its functional purpose, adjusted for the fact that the temperature range of operability is from -60°C to + 100°C, which corresponds to the rigid requirements of the Russian standards, in particular, to pneumatic brake systems of railway rolling stock.

In justified cases, the sealing device and the diaphragm can be used for similar operating conditions, while maintaining their number of excess properties, for example, listed the sealing device and the diaphragm, being hardy, can successfully operate in ambient conditions.

Thus, as a result of implementation of inventions resulting polymer composition for the manufacture according to the special technology special rubber products, which can be used in the construction of pneumatic brake systems of railway rolling stock operating in difficult climatic conditions associated with frequent and significant changes to those whom erator, working in aggressive environments at temperatures up to -60°C, stable when exposed to periodic dynamic loadings and high operational reliability and guaranteed long life.

Table 1
Physico-mechanical properties of the rubber compound
№ p/pPhysico-mechanical parametersValue
1Conditional tensile strength, MPa (kgf/cm2), not less than8.8
2Elongation at break,%, not less than140
3Shore a hardness, points Shor70-80
4The coefficient frost resistance by the elastic recovery after compression by 20%, not less,
at a temperature of minus 50°C0,50
at a temperature of minus 55°C0,30
at a temperature of minus 60°C0,15
5Relative residual deformation after aging in air at a temperature of (100±1)°C in compression by 20% within 24 h,%, no more50
6Temperature range of healthfrom -60°C to + 60°C
7The change in mass after exposure Nepomnyashchy-3 (TU 38.10195) at a temperature of (70±2)°C for (24-2) hours %withinfrom -1 to +6
8The degree of homogeneity of the polymer compositionsomavamsis ingredients and impurities no
9The minimum wall thickness of the target products, mm0,25

Table 2
Physico-mechanical properties of rubber compounds
№ p/pIndicesValue
example 1example 2example 3
1Conditional tensile strength, MPa (kgf/cm2), not
11.010.512.5
2Elongation :
break,%, not less than150160150
3Shore a hardness, points
Shor is 70-8070-8070-80
4The coefficient frost resistance by the elastic recovery after compression by 20%, not less,
at a temperature of minus 50°C0,610,680,64
at a temperature of minus 55°C0,380,410,39
at a temperature of minus 60°C0,150,180,16
5Relative residual deformation after aging in air at a temperature of (100±1)°C in compression by 20%
for (24-2) h %304025
6the changing mass after impacts Nepomnyashchy-3 (TU 38.10195) at a temperature of (70±2)°C for (24-2) hours, %,
within thefrom -1 to +5from+2 to +6from +1 to +5

1. Polymer composition for particularly difficult operating conditions, including butadiene-nitrile profinity rubber, sulfur technical, tetramethylthiuramdisulphide, N-cyclohexyl-2-benzothiazolylsulfenamide, N,N'-dithiodimorpholine, zinc oxide, stearic acid, carbon black, dibutylsebacate, characterized in that the composition additionally includes N-phenyl-β-naphtylamine and dibutyl phthalate and, in addition, includes optional butadiene-methylstyrene rubber in the following ratio of components, parts by weight:

rubber nitrile butadiene
profinity90-100
butadiene-methylstyrene rubber0-10
technical sulfur0.5 to 1.5
tetramethylthiuramdisulphide1-2
N,N'-dithiodi Holin 1.5 to 2.5
N-cyclohexyl-2-benzothiazolyl-
sulfenamid1,0-2,5
zinc oxide4-8
phenyl-β-naphtylamine0,5-2,5
carbon technical100-150
dibutyl20-40
dibutylsebacate20-40
stearic acid0,5-2,5

2. Polymer composition according to claim 1, characterized in that the mixture of rubbers shall include a combination of their grades: nitrile butadiene parafango rubber - BNKS-18, and butadiene-methylstyrene rubber-SKS-10 RCP.

3. Polymer composition according to claim 1, characterized in that the quality of carbon black composition includes the combination of its brands N-330 and P-803 in the following ratio, parts by weight:

carbon technical grade N-33050-75
carbon technical grade P-80350-75

4. Will condense the aspects of the device, movable and immovable joints, including at least one elastically deformable element with a continuous contact surface for engagement with the sealing parts, characterized in that the elastically deformable element is made of a polymer composition according to one of claims 1 to 3.

5. Aperture, comprising a thin providepulmonary plate closed, mostly circular planting area and work surface, characterized in that provideproperty plate made of a polymeric composition according to one of claims 1 to 3.

6. A method of manufacturing polymer products for pneumatic brake systems of railway rolling stock, comprising preparing a polymer composition according to one of claims 1 to 3 and the molding, while the polymer composition is subjected to trenirovki and shaping is done by injection molding.



 

Same patents:

FIELD: chemistry.

SUBSTANCE: rubber composition contains the following in pts. wt: synthetic nitrile rubber SKN-26 or SKN-26 ASM 100, suphur 0.5-2.5; an acceleration group: thiuram D 0.5-2.5, N,N'-dithiomorpholine 2-4, vulcanisation activator: zinc oxide 1.5-5.0; filler: technical carbon P-514 15-30, technical carbon T 900 55-75, white soot BS-100 5-20, plasticiser: dibutyl sebacate 5-15, polyvinyl chloride EP-6602s 10-25, diaphene FP 1-3, stearic acid 0.5-2.5.

EFFECT: composition prolongs life of the ready article due to high restorability after compression.

2 tbl

FIELD: chemistry.

SUBSTANCE: rubber mix is prepared from butadiene-nitrile rubber BNKS-18 AMN with addition of powdered ultra-high-molecular-weight polyethylene (UHMWPE) in the following ratio of components, wt %: BNKS-18 AMN butadiene-nitrile rubber 40-46.3; SKMS-10 RKP rubber 19.0; stearine 0.54; zinc white BT-M 1.63; sulphur 0.54; diaphene FP 0.54; paraffin 0.54; dibutylphthalate 3.2; technical rubber P-701 25-31.3; UHMWPE 1.63; sulfenamide T 0.54; thiuram 0.54.

EFFECT: high oil and moisture resistance and frost resistance of cushion pads.

1 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to rubber industry and a rubber mixture for tyres working in deflated state. The tyre which works in deflated state is made from a rubber mixture which contains a rubber component containing butadiene-styrene rubber which contains 5-60 wt % syndiotactic crystalline 1, 2-polybutadiene and natural rubber and/or polyisoprene rubber. The rubber mixture contains soot, sulphur or sulphur compounds. The rubber mixture preferably contains petroleum resin based on C5-hydrocarbons, having average molecular weight between 300 and 10000, which is obtained through polymerisation of petroleum hydrocarbons based on C5-hydrocarbons, in amount of 0.5-10 pts. wt per 100 pts. wt of the rubber component.

EFFECT: high wear resistance after perforation, longer distance of travel and speed.

3 cl, 13 ex, 1 tbl, 1 dwg

FIELD: chemistry.

SUBSTANCE: invention relates to a method of obtaining friction polymer materials and can be used in making brake shoes of railway wagons and locomotives, for motor transport, cranes, structural articles in machine building and other articles. The method of producing friction polymer materials involves processing butadiene or butadiene-nitrile rubber on plastification equipment with their subsequent mixture with a vulcanising agent in form of organic peroxides (A) in form of mixtures with powder (B) and solid phenol-formaldehyde resin (C) in ratio A:B:C ranging from 2:96:2 to 8:70:22. Further, a water-soluble epoxy component is added, which is a product of reacting diane resin with glycol and an aliphatic expoxy resin in form of impregnation of an aqueous solution of the resin on fibre filler with subsequent drying at resin content of 4-30% in terms of the dry product. Fine mineral or metal powder is used. The material contains the following in pts. wt: rubber - 100, vulcanising agent - 30-100, saturated fibre material - 20-120.

EFFECT: improved strength characteristics with simultaneous prevention of diffusion penetration of sulphur into the steel surface of touched article, as well as increased labour safety when mixing components on the plastification equipment - rolls, rubber mixers etc.

2 tbl, 1 ex

FIELD: chemistry.

SUBSTANCE: invention can be used in the rubber industry for making vulcanised butadiene-nitrile based rubber with high thermal-oxidative resistance. The polymer anti-ageing paste contains polyvinyl chloride, plasticiser, stearic acid, molten mass of anti-ageing agents containing N-isopropyl-N-phenyl-n-phenylenediamine, polymer of 2,2,4-trimethyl-1,2-dihydroquinoline ε-caprolactam.

EFFECT: reduced viscosity of the paste which simplifies its further processing on rubber mixing equipment, increased thermal-oxidative resistance of the rubber.

3 tbl

FIELD: chemistry.

SUBSTANCE: rubber mixture contains the following components, pts. wt: hydrogenated butadiene-nitrile rubber - 100, quinol ether EK-1 - 3-7, technical carbon - 40-50, plasticiser - 6-10, stearic acid - 1-2, antioxidant - 1-3. Quinol ether EK-1 is the curing agent for the rubber mixture.

EFFECT: faster curing rate, possibility of carrying out the process at lower temperatures, reduced level of accumulation of remnant deformations when tested under static compression conditions.

5 tbl

FIELD: chemistry.

SUBSTANCE: rubber composition consists of, wt %: polypropylene - 3-21, butadiene-nitrile rubber - 22-55, olefin rubber - 2.5 -9.5, modificator, cross-linking agent for rubbers - 1.5-3.5, activator - 0.18-0.3, plasticiser - 3.0-7.5, mineral oil - 8-40. The composition contains polyisocyanate containing not less than two isocyanate groups (0.05-2.3 wt %) as a modificator and polypropylene with 1-6% of grafted maleic anhydride or maleic acid - 6-20 wt %. Plasticiser solubility parametre of is not less than 18 (kJ/m3)1/2.

EFFECT: oil resistance enhancing, decrease of relative residual elongation and melt flow index.

1 tbl, 9 ex

FIELD: chemistry, engineering process.

SUBSTANCE: present invention pertains to rubber industry, to production of elastic and wear resistant rubber based on butadiene-nitrile rubber. The rubber mixture contains the following, in wt.pts: butadiene-nitrile rubber - 18 with content of acrylonitrile - 17-23 wt % - 100, sulphur - 2.45-2.65, captax - 1.45-1.55, zinc oxide - 2.4-2.6, technical carbon "П803" - 1.4-1.6, thermal expanded graphite - 8-12.

EFFECT: improved elasticity and reduced bulk wear during abrasion, with significant reduction of content of technical carbon, which increases sealing ability and operational life of sealing devices, used in mobile friction assemblies.

2 tbl

FIELD: chemistry.

SUBSTANCE: present invention relates to the rubber industry, particularly to oil resistant rubber composition with good operational characteristics. The rubber composition is based on butadiene-nitrile rubber mixed with, wt.pts, 1.8-2.0 tetramethylthiuram disulphide, 1.4-1.6 hexachloro-n-xylol, 0.9-1.1 N-phenyl- N1-isopropyl-n-phenylenediamine and 1.0-2.0 oligomer of 2,2,4tetramethyl-1,2 dihydroquinoline, 0.9-1.1 antifatigue agent and heat stabiliser of dioctylamine(4-phenylaminophenyl) thiophosphonic acid ("Б"-26) with technical carbon, sulphur and target additives.

EFFECT: increased tear resistance and improved physical and mechanical properties of the rubber.

3 tbl

FIELD: chemistry.

SUBSTANCE: invention refers to adhesive polymer composite material, method of production thereof, product keeping its shape, and hermetic or adhesive composition containing mentioned composite material used in automotive engineering, constructional engineering, wood working, printing industry, footwear industry, as well as in sealing materials and insulation substance. The task in view is solved due to application of polymer composite including at least one hydrogenated or nonhydrogenated polymer nitrile rubber with Mooney viscosity (ML 1+4 at 100°C) less than 30 at least one cross-linking agent or vulcanizing system, and if required at least one bulking agent. Hydrogenated or nonhydrogenated polymer nitrile rubber is derived from metathesis reaction of polymer nitrile rubber with one or several compounds of general formulas I, II, III or IV. If required it is followed by hydrogenation.

EFFECT: development of composite material with long adhesive capacity, elasticity and thermal stability.

9 cl, 3 tbl, 3 ex

FIELD: chemistry.

SUBSTANCE: rubber mix is prepared from butadiene-nitrile rubber BNKS-18 AMN with addition of powdered ultra-high-molecular-weight polyethylene (UHMWPE) in the following ratio of components, wt %: BNKS-18 AMN butadiene-nitrile rubber 40-46.3; SKMS-10 RKP rubber 19.0; stearine 0.54; zinc white BT-M 1.63; sulphur 0.54; diaphene FP 0.54; paraffin 0.54; dibutylphthalate 3.2; technical rubber P-701 25-31.3; UHMWPE 1.63; sulfenamide T 0.54; thiuram 0.54.

EFFECT: high oil and moisture resistance and frost resistance of cushion pads.

1 tbl

Polymer composition // 2395542

FIELD: chemistry.

SUBSTANCE: invention relates to polymer compositions, particularly to rubber mixtures for making tyre treads and can be used in the tyre industry. The polymer composition contains the following components, in pts. wt: polybutadiene rubber SKD 20-30, polyisoprene rubber SKI-3 70-80, zinc oxide 4-5, technical carbon N339 50-55, oleic acid 1.5-2.0, sulphur 1.5-2.2, sulfenamide T 1.0-1.5, diaphene PP 1.0-1.5, Pikar hydrocarbon resin 2-3, oil PN-6s 10-15, Omsk-10 wax 1.5-2.0, acetonanyl N 1.5-2.0, santogard PVI 0.1-0.15, 3-15 mm long pieces of waste hybrid saturated cords 1.5-20.0.

EFFECT: increased extension elongation, bouncing elasticity and lower brittleness temperature.

2 cl, 4 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to industrial rubber and particularly to rubber mixtures for making frost resistant cushion blocks for railway line braces. The rubber mixture consists of the following in pts. wt: natural rubber - 100, zinc oxides - 5-10, crumbs made from corks - 10-15, P-514 technical carbon - 20-25, P-701 technical carbon - 15-25, technical sulphur - 1-2, acetonanil P - 1-2, sulfonamide C - 1.5-2.0, diaphene FP - 1-2, stearin - 1-2.

EFFECT: cushion blocks made from the said mixture have low residual deformation, high frost resistance, high noise and vibration damping capacity.

3 tbl

FIELD: polymer chemistry, in particular plant rubber composition.

SUBSTANCE: clamed composition includes (mass parts): plant rubber 100; sulfenamide 1-3; zinc oxide 5-15; stearic acid 0.5-3.5; antiaging agent 1-2; and sulfur 2-3. Composition of present invention makes it possible to avoid heating of working parts and is useful in manufacturing of damping and power component available in contact with water at temperature from -450C to +700C.

EFFECT: composition of high springback elasticity.

1 ex

The rubber mixture // 2232172
The invention relates to the rubber industry, in particular the production of rubber compounds used for the manufacture of products for various purposes, including acoustic coatings

The invention relates to the field of compositions based on petroleum bitumen, rubber, used in construction, waterproofing, repair of concrete and asphalt pavements, Gulf of cracks in them, sealing, corrosion protection, construction of the roof

Rubber composition // 2215756
The invention relates to the rubber industry, in particular to the rubber composition with improved performance characteristics

The invention relates to the production of thermoplastic compositions that can be used in rubber, automotive industry, in particular for the manufacture of gaskets, membranes

The rubber mixture // 2167171
The invention relates to the tire and rubber industry

Polymer composition // 2165440
The invention relates to polymeric compositions that can be used for the manufacture of rubber products such as o-rings to field pipelines

FIELD: chemistry.

SUBSTANCE: invention relates to a polycarbonate resin as substrate material for making transparent moulded articles. The polycarbonate resin is obtained using a continuous method on a phase boundary through phosgenation of bisphenols at temperature between 0 and 40°C with 8-17 mol % excess phosgene. The resin contains carbamate compounds of formula (I) in which R1 and R2 denote hydrogen or C1-C12 alkyl, mainly methyl, ethyl, propyl or butyl, or R1 and R2 together denote C4-C12 alkylidene, R3 and R4 denote, C1-C12 alkyl or phenyl, or R3 and R4, bonded with a carbon atom, together form cyclohexyl or trimethylcyclohexyl.

EFFECT: invention enables to obtain polycarbonate resin with low content of carbamate compound impurities equal to 0,01-150 parts per million.

9 cl, 1 tbl, 6 ex

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