CN113736153B - Sealing gasket and preparation method and application thereof - Google Patents
Sealing gasket and preparation method and application thereof Download PDFInfo
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- CN113736153B CN113736153B CN202111158921.7A CN202111158921A CN113736153B CN 113736153 B CN113736153 B CN 113736153B CN 202111158921 A CN202111158921 A CN 202111158921A CN 113736153 B CN113736153 B CN 113736153B
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/14—Peroxides
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F11/00—Arrangements for sealing leaky tubes and conduits
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Abstract
The invention discloses a sealing gasket and a preparation method and application thereof, and belongs to the technical field of rubber sealing gaskets. The sealing gasket is prepared from the following raw materials, by weight, 100 parts of hydrogenated nitrile rubber, 3-4 parts of a vulcanizing agent and 60-100 parts of carbon black; the grade of the hydrogenated nitrile-butadiene rubber is AT3904, the grade of the vulcanizing agent is KNOX-14-40B-PD-S, and the carbon black is medium-particle thermal cracking carbon black. The sealing gasket prepared from the raw materials has the advantages of high elasticity, high crosslinking density and proper shrinkage rate, can be free from secondary vulcanization in the preparation process, can be put into use after primary vulcanization, shortens the processing flow and greatly improves the economic benefit. The sealing gasket can be used in a heat exchanger, and the sealing effect of the heat exchanger is improved.
Description
Technical Field
The invention relates to the technical field of rubber sealing gaskets, in particular to a sealing gasket and a preparation method and application thereof.
Background
Hydrogenated nitrile rubber (abbreviated to HNBR or HSN) is a product obtained by hydrogenating and saturating carbon-carbon double bonds in molecular chains in nitrile rubber, and is also called highly saturated nitrile rubber.
The hydrogenated nitrile rubber has good oil resistance (good resistance to fuel oil, lubricating oil and aromatic solvents); moreover, due to the highly saturated structure, the high-performance epoxy resin has good heat resistance, excellent chemical corrosion resistance (good resistance to Freon, acid and alkali), excellent ozone resistance and higher compression permanent deformation resistance; meanwhile, the hydrogenated nitrile rubber has the characteristics of high strength, high tearing performance, excellent wear resistance and the like, and is one of rubbers with extremely excellent comprehensive performance.
However, at present, the hydrogenated nitrile rubber needs to be subjected to secondary vulcanization for 4 to 6 hours in an oven at the temperature of 150 ℃ after primary vulcanization treatment in the processing process of the hydrogenated nitrile rubber so as to obtain a rubber product with use value. The available low-pressure-change hydrogenated nitrile rubber products can be obtained only by adopting a one-stage vulcanization process.
In view of this, the invention is particularly proposed.
Disclosure of Invention
The invention aims to provide a sealing gasket, which can obtain good finished product performance by only performing a vulcanization process in the subsequent processing process according to the raw material formula of the sealing gasket.
The second purpose of the invention is to provide a preparation method of the sealing gasket.
It is a further object of the present invention to provide a use of the above-described gasket, for example, in a heat exchanger.
The fourth purpose of the invention is to provide a heat exchanger with the sealing gasket.
The application can be realized as follows:
according to the first aspect, the application provides a sealing gasket, which comprises the following raw materials, by weight, 100 parts of hydrogenated nitrile rubber, 3-4 parts of a vulcanizing agent and 60-100 parts of carbon black;
the grade of the hydrogenated nitrile-butadiene rubber is AT3904, the grade of the vulcanizing agent is KAOX14-40B-PD-S, and the carbon black is medium-particle thermal cracking carbon black.
In alternative embodiments, the carbon black is under the designation JX109 or N990.
In a preferred embodiment, the carbon black is under the designation JX109.
In an alternative embodiment, the preparation raw materials also comprise 5-10 parts of nano inorganic filler, 1-8 parts of auxiliary crosslinking agent and 1-3 parts of anti-aging agent by weight.
In a preferred embodiment, the preparation raw material comprises 95 parts of hydrogenated nitrile rubber, 3.5 parts of vulcanizing agent, 80 parts of carbon black, 7.5 parts of nano inorganic filler, 4.5 parts of auxiliary crosslinking agent and 2 parts of anti-aging agent.
In an alternative embodiment, the anti-aging agent is sold under the brand number 445.
In an alternative embodiment, the nano-inorganic filler is nano-zinc oxide.
In an alternative embodiment, the raw materials are prepared without plasticizers.
In an alternative embodiment, the gasket has a shrinkage of 1.8 to 2.3%, a tensile strength at break of 18 to 22MPa, an elongation at break of not less than 200%, a hardness of 75 to 85SHA, a tear strength of 38 to 55KN/m, and a compression set at 150 ℃ of not more than 26%.
In a second aspect, the present application provides a method of making a gasket as in any of the preceding embodiments, comprising the steps of: and (3) sequentially carrying out calendering, semi-finished product extrusion molding and one-step vulcanization molding on the prepared raw materials mixed according to the proportion.
In an alternative embodiment, the one-step vulcanization molding process is only carried out for one-step vulcanization, and the one-step vulcanization is carried out at 180-190 ℃ for 5-10min.
In a preferred embodiment, the one-stage vulcanization is carried out at 185 ℃ for 5 to 10min.
In a third aspect, the present application provides the use of a gasket according to any of the preceding embodiments, for example for use in a heat exchanger.
In an alternative embodiment, the gasket is used in an oilfield mixed oil heat exchanger.
In a fourth aspect, the present application provides a heat exchanger having the gasket of any of the preceding embodiments.
In an alternative embodiment, the heat exchanger is an oilfield mixed oil heat exchanger.
The beneficial effect of this application includes:
according to the rubber product, the hydrogenated nitrile rubber with a specific brand, the peroxide vulcanizing agent and the medium-particle thermal cracking carbon black are matched according to specific using amounts, so that the volume increase of the obtained rubber product can be maximized under the condition of only one-stage vulcanization treatment, the crosslinking density and elasticity of the rubber product are effectively improved, and the shrinkage rate of the rubber product can be effectively reduced while the carbon black filling amount is maximum.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are conventional products which are not indicated by manufacturers and are commercially available.
The following provides specific descriptions of the gasket, its preparation method and its application.
The application provides a sealing gasket, which comprises the following raw materials, by weight, 100 parts of hydrogenated nitrile rubber, 3-4 parts of a vulcanizing agent and 60-100 parts of carbon black.
The vulcanizing agent compounded with 100 parts of hydrogenated nitrile rubber may be used, by reference, in an amount of 3 parts, 3.2 parts, 3.5 parts, 3.8 parts, 4 parts, etc., and may be any other value within the range of 3 to 4.
The carbon black compounded with 100 parts of hydrogenated nitrile rubber may be used in an amount of 60 parts, 65 parts, 70 parts, 75 parts, 80 parts, 85 parts, 90 parts, 95 parts, 100 parts, or the like, or may be any other value within the range of 60 to 100.
Wherein the grade of the hydrogenated nitrile-butadiene rubber is AT3904, the grade of the vulcanizing agent is KNOX14-40B-PD-S, and the carbon black is medium-particle thermal cracking carbon black.
The acrylonitrile content of the hydrogenated nitrile rubber with the trade name of AT3904 is about 39 percent, the Mooney viscosity AT 100 ℃ is 39, and the residual double bond content is less than 0.9.
The hydrogenated nitrile rubber with the mark of AT3904 can simultaneously have higher acrylonitrile content and lower Mooney viscosity, so that the sealing gasket has higher oil resistance and better processing performance.
It is to be noted that the same hydrogenated nitrile rubbers of grade 3607 and 3907 having a residual double bond content of < 0.9 do not achieve the effect of AT3904 as far as possible, for example, the hydrogenated nitrile rubber of grade 3607 has poor oil resistance and the hydrogenated nitrile rubber of grade 3907 has poor processability.
In the application, the vulcanizing agent is a peroxide vulcanizing agent, and the specific mark is KNOX14-40B-PD-S. The vulcanizing agent has the characteristics of small high-temperature compression permanent deformation and small smell (almost no smell). The vulcanizing agent has a tensile strength of about 20MPa, an elongation of about 280%, a hardness of about 80SHA, a tear strength of about 50KN/mm, and a high-temperature pressure change of about 15%.
It is worth to say that under the condition that the hardness is 80SHA, the vulcanizing agents with the grades of DCP and 101, which are both peroxides, can cause the high-temperature compression permanent deformation of the rubber material to be large, and a product meeting the requirements cannot be obtained through one-time vulcanization.
In the present application, thermal carbon blacks have a larger particle size and a lower specific surface area in carbon blacks.
In alternative embodiments, the carbon black may be of a grade JX109 or N990, which corresponds to a high loading of carbon black in the product, resulting in a corresponding product with good elasticity and low shrinkage. JX109 is preferred in view of economic efficiency and the like.
It is worth to say that under the condition that the hardness of the final product is kept at about 80SHA, the carbon black with the mark of JX109 or N990 has obviously smaller influence on the shrinkage rate of the product than the carbon black with the mark of N330 and N550, and the product meeting the requirements can be obtained through one-time vulcanization.
Through the dosage cooperation that provides according to this application with above-mentioned brand hydrogenated nitrile rubber, peroxide vulcanizing agent and medium particle thermal cracking carbon black, can make the volume increase of the rubber product of obtaining reach the maximize to effectively improve the crosslink density and the elasticity of rubber product, can also effectively reduce the shrinkage factor of rubber product when carbon black filling volume is the biggest.
Furthermore, the preparation raw materials of the application can also comprise auxiliary agents, such as inorganic filler, an auxiliary crosslinking agent, an anti-aging agent and the like, so that the acid-base resistance, the aging resistance and other properties of the product are improved, and the service life of the product is prolonged.
The raw materials for preparation can comprise 5-10 parts of nano inorganic filler, 1-8 parts of assistant crosslinking agent and 1-3 parts of anti-aging agent according to the same weight part.
The nano inorganic filler may be used in an amount of, for example, 5 parts, 5.5 parts, 6 parts, 6.5 parts, 7 parts, 7.5 parts, 8 parts, 8.5 parts, 9 parts, 9.5 parts, or 10 parts, and may be used in an amount of any other value within a range of 5 to 10.
The amount of the crosslinking agent may be 1 part, 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts or 8 parts, or may be any other value within the range of 1 to 8.
The amount of the antioxidant to be used may be 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts, etc., or may be any other value within the range of 1 to 3.
In a preferred embodiment, the preparation raw material comprises 95 parts of hydrogenated nitrile rubber, 3.5 parts of vulcanizing agent, 80 parts of carbon black, 7.5 parts of nano inorganic filler, 4.5 parts of auxiliary crosslinking agent and 2 parts of anti-aging agent. The performance of the sealing gasket obtained under the preferable proportioning condition is better.
In an alternative embodiment, the anti-aging agent may be designated 445, which has the advantage of being resistant to high temperatures. The nano inorganic filler is nano zinc oxide. The auxiliary crosslinking agent can be any one commonly used in the rubber field, such as trimethylolpropane triacrylate, N' -p-phenylene bismaleimide, 1, 2-polybutadiene, and the like.
In the present application, the raw materials for preparation do not contain a plasticizer.
In the case of current hydrogenated nitrile rubber products, the raw materials for their preparation usually contain plasticizers to improve the plasticity and strength of the polymer. However, the raw materials for preparing the hydrogenated nitrile rubber are not added with the plasticizer, so that the product still has better plasticity and strength. Moreover, the toxic effect caused by improper use of the plasticizer can be avoided by not using the plasticizer, and the safety and the environmental protection are improved.
In an alternative embodiment, the gasket provided herein has a shrinkage of 1.8 to 2.3%, a tensile strength at break of 18 to 22MPa, an elongation at break of not less than 200%, a hardness of 75 to 85SHA, a tear strength of 38 to 55KN/m, and a compression set at 150 ℃ of not more than 26%. And the compression ratio corresponding to the compression set rate is 25%, namely the compression ratio refers to that the sample is compressed by 25% in a pressure transformer when the compression set is carried out, the sample is placed in a drying oven at 150 ℃ for 24h, the sample is taken out of the pressure transformer after the compression set is finished, the sample is placed at normal temperature for 30min, and the measured height reduction of the test block is high-temperature compression set.
Correspondingly, the application also provides a preparation method of the sealing gasket, which comprises the following steps: and (3) sequentially carrying out calendering, semi-finished product extrusion molding and one-step vulcanization molding on the prepared raw materials mixed according to the proportion.
The calendering and the semi-finished product extrusion molding processes in the above processes can both refer to the prior art, and are not described in detail herein.
It is emphasized that in the current process of hydrogenated nitrile rubber, after a first vulcanization treatment, a second vulcanization is carried out in an oven at about 150 ℃ for 4-6h to obtain a rubber product with use value (i.e. two vulcanization steps are required). In the one-step vulcanization molding process, two-stage vulcanization is not needed, and only one-stage vulcanization is needed.
In an alternative embodiment, the first stage vulcanization may be carried out at 180 to 190 ℃ (e.g., 180 ℃, 185 ℃, 190 ℃, etc.) for 5 to 10min (e.g., 5min, 8min, 10min, etc.), preferably at 185 ℃ for 5 to 10min.
By carrying out the first-stage vulcanization under the conditions, the shrinkage rate of the obtained rubber material product is about 1.8-2%, the whole processing flow is effectively shortened by only carrying out the first-stage vulcanization, and the economic benefit is greatly improved.
In addition, the shrinkage rate of the rubber material product is more in line with that of an ethylene propylene diene monomer mold and a nitrile butadiene rubber mold, in the actual production, the vulcanization is directly carried out by using the existing ethylene propylene diene monomer mold or nitrile butadiene rubber mold, the three rubber materials share one set of mold, a new mold in line with the shrinkage rate of hydrogenated nitrile butadiene rubber does not need to be separately opened, and a large amount of mold opening cost can be saved for rubber enterprises.
In addition, the application also provides the application of the sealing gasket, for example, the sealing gasket can be used in a heat exchanger, especially an oil field mixed oil heat exchanger, the sealing performance and the oil resistance of the heat exchanger can be improved, and the service life of the heat exchanger can be prolonged.
Correspondingly, the application also provides a heat exchanger (such as an oilfield mixed oil heat exchanger) which is provided with the sealing gasket.
The features and properties of the present invention are described in further detail below with reference to examples.
Example 1
The embodiment provides a sealing gasket, which is prepared from the following raw materials, by weight, 100 parts of hydrogenated nitrile rubber, 3.5 parts of a vulcanizing agent, 80 parts of carbon black, 7.5 parts of a nano inorganic filler, 4.5 parts of an auxiliary crosslinking agent and 2 parts of an anti-aging agent, and does not contain a plasticizer.
The grade of the hydrogenated nitrile-butadiene rubber is AT3904, the grade of the vulcanizing agent is KNOX14-40B-PD-S, the grade of the carbon black is JX109, the grade of the anti-aging agent is 445, the nano inorganic filler is nano zinc oxide, and the co-crosslinking agent is trimethylolpropane triacrylate.
The preparation process of the sealing gasket comprises the following steps:
mixing the prepared raw materials according to a ratio, then calendering, extruding and molding a semi-finished product, and vulcanizing for 10min at 185 ℃ for one section to obtain the sealing gasket suitable for the oilfield mixed oil heat exchanger.
The gasket was subjected to a performance test in which the shrinkage was measured with reference to "GJB 5873-2006", the elongation at break was measured with reference to "GB/T528-2009", the tensile strength at break was measured with reference to "GB/T528-2009", the strength at break was measured with reference to "GB/T529", the tear strength was measured with reference to "GB/T529-2008", the hardness was measured with reference to "GB/T531.1-2008", and the compression set at 150 ℃ was measured with reference to "GB/T7759.1-2915".
The results show that: the dimensional shrinkage of the gasket was 1.8%, the elongation at break was 280%, the tensile strength at break was 22MPa, the tear strength was 55KN/m, the hardness was 80SHA, and the compression set at 150 ℃ was 13%.
Example 2
This example provides a gasket which differs from example 1 only in the formulation of the raw materials used for the preparation.
Specifically, the method comprises the following steps: the preparation raw materials comprise, by weight, 100 parts of hydrogenated nitrile rubber, 3 parts of a vulcanizing agent, 60 parts of carbon black, 5 parts of nano inorganic filler, 1 part of an auxiliary crosslinking agent and 1 part of an anti-aging agent, and the preparation raw materials do not contain a plasticizer.
The hydrogenated nitrile rubber is AT3904, the vulcanizing agent is KNOX14-40B-PD-S, the carbon black is JX109, the anti-aging agent is 445, the nano inorganic filler is nano zinc oxide, and the co-crosslinking agent is trimethylolpropane triacrylate.
The preparation process of the sealing gasket comprises the following steps:
mixing the prepared raw materials according to a ratio, then calendaring, extruding and molding a semi-finished product, and vulcanizing for 10min at 185 ℃ for one time to obtain the sealing gasket suitable for the oil field mixed oil heat exchanger.
The performance test of the gasket of this example was carried out under the same test conditions and method as in example 1, and the results show that: the gasket had a shrinkage of 2.2%, an elongation at break of 320%, a tensile strength at break of 20MPa, a tear strength of 52KN/m, a hardness of 76SHA, and a compression set at 150 ℃ of 20%.
Example 3
This example provides a gasket which differs from example 1 only in the formulation of the raw materials used for the preparation.
Specifically, the method comprises the following steps: the preparation raw materials comprise, by weight, 100 parts of hydrogenated nitrile rubber, 4 parts of a vulcanizing agent, 100 parts of carbon black, 10 parts of nano inorganic filler, 8 parts of an auxiliary crosslinking agent and 3 parts of an anti-aging agent, and the preparation raw materials do not contain a plasticizer.
The hydrogenated nitrile rubber is AT3904, the vulcanizing agent is KNOX14-40B-PD-S, the carbon black is JX109, the anti-aging agent is 445, the nano inorganic filler is nano zinc oxide, and the co-crosslinking agent is trimethylolpropane triacrylate.
The preparation process of the sealing gasket comprises the following steps:
mixing the prepared raw materials according to a ratio, calendering, extruding and molding a semi-finished product, and vulcanizing for 10min at 185 ℃ for one section to obtain the sealing gasket suitable for the oilfield mixed oil heat exchanger.
The gasket of this example was subjected to the performance test under the same test conditions and method as in example 1, and the results thereof showed that: the gasket had a shrinkage of 2.0%, an elongation at break of 269%, a tensile strength at break of 19MPa, a tear strength of 45KN/m, a hardness of 83SHA, and a compression set at 150 ℃ of 17%.
Example 4
This example provides a gasket which differs from example 1 only in the formulation of the raw materials for preparation.
Specifically, the method comprises the following steps: the preparation raw materials comprise, by weight, 100 parts of hydrogenated nitrile rubber, 3.8 parts of a vulcanizing agent, 70 parts of carbon black, 8 parts of a nano inorganic filler, 3 parts of an auxiliary crosslinking agent and 2.5 parts of an anti-aging agent, and the preparation raw materials do not contain a plasticizer.
The hydrogenated nitrile rubber is AT3904, the vulcanizing agent is KNOX14-40B-PD-S, the carbon black is JX109, the anti-aging agent is 445, the nano inorganic filler is nano zinc oxide, and the co-crosslinking agent is trimethylolpropane triacrylate.
The preparation process of the sealing gasket comprises the following steps:
mixing the prepared raw materials according to a ratio, calendering, extruding and molding a semi-finished product, and vulcanizing for 10min at 185 ℃ for one section to obtain the sealing gasket suitable for the oilfield mixed oil heat exchanger.
The performance test of the gasket of this example was carried out under the same test conditions and method as in example 1, and the results show that: the gasket had a shrinkage of 2.3%, an elongation at break of 240%, a tensile strength at break of 21MPa, a tear strength of 43KN/m, a hardness of 77SHA, and a compression set at 150 ℃ of 16%.
Example 5
This example provides a gasket which differs from example 1 only in the formulation of the raw materials used for the preparation.
Specifically, the method comprises the following steps: the preparation raw materials comprise, by weight, 100 parts of hydrogenated nitrile rubber, 3.2 parts of a vulcanizing agent, 80 parts of carbon black, 6 parts of nano inorganic filler, 6 parts of an auxiliary crosslinking agent and 1.5 parts of an anti-aging agent, and the preparation raw materials do not contain a plasticizer.
The hydrogenated nitrile rubber is AT3904, the vulcanizing agent is KNOX14-40B-PD-S, the carbon black is JX109, the anti-aging agent is 445, the nano inorganic filler is nano zinc oxide, and the co-crosslinking agent is trimethylolpropane triacrylate.
The preparation process of the sealing gasket comprises the following steps:
mixing the above prepared raw materials according to a ratio, calendaring, extruding and molding a semi-finished product, and vulcanizing for 10min at 185 ℃ for one section to obtain the sealing gasket suitable for the oilfield mixed oil heat exchanger.
The gasket of this example was subjected to the performance test under the same test conditions and method as in example 1, and the results thereof showed that: the gasket had a shrinkage of 2.1%, a tensile elongation at break of 210%, a tensile strength at break of 18MPa, a tear strength of 48KN/m, a hardness of 77SHA, and a compression set at 150 ℃ of 22%.
Example 6
This example provides a gasket that differs from example 1 only in the preparation of the carbon black in the feedstock having the designation N990.
The performance test of the gasket of this example was carried out under the same test conditions and method as in example 1, and the results show that: the gasket had a shrinkage of 2.0%, an elongation at break of 210%, a tensile strength at break of 20MPa, a tear strength of 45KN/m, a hardness of 78SHA, and a compression set at 150 ℃ of 16%.
Example 7
This example provides a gasket which differs from example 1 only in that the co-crosslinking agent in the starting materials for the preparation is N, N' -p-phenylene bismaleimide.
The gasket of this example was subjected to the performance test under the same test conditions and method as in example 1, and the results thereof showed that: the gasket had a shrinkage of 2.3%, an elongation at break of 240%, a tensile strength at break of 18MPa, a tear strength of 49KN/m, a hardness of 83SHA, and a compression set at 150 ℃ of 19%.
Example 8
This example provides a gasket which differs from example 1 only in that the co-crosslinking agent in the starting materials for the preparation is 1, 2-polybutadiene.
The gasket of this example was subjected to the performance test under the same test conditions and method as in example 1, and the results thereof showed that: the gasket had a shrinkage of 2.2%, an elongation at break of 260%, a tensile strength at break of 19MPa, a tear strength of 46KN/m, a hardness of 75SHA, and a compression set at 150 ℃ of 26%.
Example 9
This example provides a gasket which differs from example 1 only in that one-stage vulcanization is carried out at 180 ℃ for 10min during the production process.
The gasket of this example was subjected to the performance test under the same test conditions and method as in example 1, and the results thereof showed that: the gasket had a shrinkage of 2.1%, an elongation at break of 255%, a tensile strength at break of 21MPa, a tear strength of 45KN/m, a hardness of 78SHA, and a compression set at 150 ℃ of 20%.
Example 10
This example provides a gasket which differs from example 1 only in that one-stage vulcanization is carried out at 190 ℃ for 5min during the production process.
The gasket of this example was subjected to the performance test under the same test conditions and method as in example 1, and the results thereof showed that: the gasket had a shrinkage of 1.9%, an elongation at break of 200%, a tensile strength at break of 22MPa, a tear strength of 38KN/m, a hardness of 86SHA, and a compression set at 150 ℃ of 17%.
Comparative example 1
Taking example 1 as an example, the comparative example is different from example 1 mainly in the fact that the grade of hydrogenated nitrile rubber is different (specifically 3607 complete hydrogenation type and 3907 complete hydrogenation type shown in Table 1), and the rest conditions are the same as in example 1.
TABLE 1 hydrogenated nitrile rubbers of different grades
The gasket of this comparative example was subjected to a performance test under the same test conditions and method as in example 1, and the results thereof showed that:
the gasket manufactured by the hydrogenated nitrile rubber with the mark of 3607 has the shrinkage of 2.5 percent, the elongation at break of 270 percent, the tensile strength at break of 21MPa, the tearing strength of 52KN/m, the hardness of 78SHA and the compression set rate of 24 percent at 150 ℃.
The shrinkage of the gasket prepared by using the hydrogenated nitrile rubber with the mark 3907 is 2.8 percent, the elongation at break is 230 percent, the tensile strength at break is 21MPa, the tear strength is 47KN/m, the hardness is 78SHA, and the compression set at 150 ℃ is 24 percent.
It can thus be seen that not any hydrogenated nitrile rubber is suitable for the process of the present application in which only one stage of vulcanization is carried out and which results in gasket products of excellent properties.
Comparative example 2
Taking example 1 as an example, the comparative example is different from example 1 mainly in the selection of the grade of carbon black and the amount of carbon black (specifically, N330 carbon black and N550 carbon black shown in table 2), and the other conditions are the same as example 1.
TABLE 2 different brands of carbon blacks
| Various carbon blacks | N330 | N550 | JX109 |
| Dosage of | 50 portions of | 55 portions of | 80 portions |
The gasket of this comparative example was subjected to a performance test under the same test conditions and method as in example 1, and the results thereof showed that:
the shrinkage of the gasket made with the carbon black designation N330 was 2.5% and the hardness was 80SHA.
The shrinkage of the gasket made corresponding to the carbon black brand of N550 was 2.4%, and the hardness was 80SHA.
It can be seen that the carbon black used in example 1 of the present application has a higher loading in the product and the corresponding gasket has a lower shrinkage rate for equal hardness of the product.
Comparative example 3
Taking example 1 as an example, the comparative example is different from example 1 mainly in that the marks of peroxide vulcanizing agents are different (specifically, DCP vulcanizing agent and 101 vulcanizing agent), and the rest conditions are the same as example 1.
The gasket of this comparative example was subjected to a performance test under the same test conditions and method as in example 1, and the results thereof showed that:
the gasket prepared correspondingly with the vulcanizing agent DCP has the tensile elongation at break of 270%, the tensile strength at break of 19MPa, the tearing strength of 52KN/m, the hardness of 80SHA and the compression permanent deformation rate of 20% at 150 ℃.
The gasket manufactured by the vulcanizing agent with the 101 corresponding mark has the elongation at break of 255 percent, the tensile strength at break of 21MPa, the tearing strength of 51KN/m, the hardness of 80SHA and the compression set at 150 ℃ of 23 percent.
It can be seen from this that the vulcanizing agent used in example 1 of the present application enables the gasket to have a small high-temperature (150 ℃ C.) compression set.
Comparative example 4
Taking example 1 as an example, the comparative example differs from example 1 mainly in that the plasticizer (TOTM and TP759, respectively) is used in the raw material, and the other conditions are the same as example 1.
The gasket of this comparative example was subjected to a performance test under the same test conditions and method as in example 1, and the results thereof showed that:
the elongation of the gasket obtained using the TOTM-brand plasticizer was 260%, the tensile strength at break was 20MPa, the tear strength was 47KN/m, the hardness was 80SHA, and the compression set at 150 ℃ was 28%.
The gasket produced using the plasticizer having a brand number of TP759 had a tensile elongation at break of 230%, a tensile strength at break of 20MPa, a tear strength of 44KN/m, a hardness of 80SHA, and a compression set at 150 ℃ of 20%.
Therefore, the sealing gasket has smaller high-temperature (150 ℃) compression permanent deformation without adopting the plasticizer in the embodiment 1 of the application, can avoid the possible toxic problem of the plasticizer, and is safe and environment-friendly.
Comparative example 5
Taking example 1 as an example, the comparative example is different from example 1 mainly in the vulcanization process conditions, and the rest conditions are the same as example 1, and the specific processes refer to table 3.
TABLE 3 vulcanization Process
| a | b | c | |
| One stage vulcanization | 160-170℃，10min | 180-185℃，10min | 180-185℃，10min |
| Two stage vulcanization | 150℃，4-6h | 150℃，4-6h | Free of two stages |
The gasket of this comparative example was subjected to a performance test under the same test conditions and method as in example 1, and the results thereof showed that:
and in the vulcanization process, the shrinkage rate of the gasket prepared correspondingly to the step a is 2.8%.
And b is the shrinkage of the sealing gasket correspondingly prepared by the vulcanization process of 2.3%.
The vulcanization process c (example 1) corresponds to a gasket having a shrinkage of 1.8%.
Therefore, in the embodiment 1 of the application, through a one-stage vulcanization process without a two-stage vulcanization process, the sealing gasket obtained through the one-stage vulcanization process with the treatment temperature of 185 ℃ for 10min can have small high-temperature pressure change, and the sealing performance is favorably improved.
In conclusion, the sealing gasket prepared from the raw materials and the proportion provided by the application has the advantages of high elasticity, high crosslinking density and proper shrinkage rate, can be free from secondary vulcanization in the preparation process, can be put into use after primary vulcanization, shortens the processing flow and greatly improves the economic benefit. The sealing gasket can be used in a heat exchanger (especially an oil field mixed oil heat exchanger) to improve the sealing effect of the heat exchanger.
The present invention has been described in terms of the preferred embodiment, and it is not intended to be limited to the embodiment. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (11)
1. The gasket is characterized in that the gasket is prepared from the following raw materials, by weight, 100 parts of hydrogenated nitrile rubber, 3-4 parts of a vulcanizing agent, 60-100 parts of carbon black, 5-10 parts of a nano inorganic filler, 1-8 parts of an auxiliary crosslinking agent and 1-3 parts of an anti-aging agent; the preparation raw materials do not contain a plasticizer;
the hydrogenated nitrile rubber is AT3904, the vulcanizing agent is PERKADOX-14-40B-PD-S, and the carbon black is medium-particle thermal cracking carbon black; the carbon black is JX109 or N990;
the preparation method of the sealing gasket comprises the following steps: sequentially carrying out calendering, semi-finished product extrusion molding and one-step vulcanization molding on the prepared raw materials mixed according to the proportion;
the one-step vulcanization molding process is only carried out for one-step vulcanization, and the one-step vulcanization is carried out for 5-10min at the temperature of 180-190 ℃.
2. The gasket of claim 1 wherein said carbon black is designated JX109.
3. The gasket according to claim 1 or 2, wherein the raw materials for preparation include 100 parts of the hydrogenated nitrile rubber, 3.5 parts of the vulcanizing agent, 80 parts of the carbon black, 7.5 parts of the nano inorganic filler, 4.5 parts of the co-crosslinking agent, and 2 parts of the anti-aging agent.
4. A gasket according to claim 3, wherein the antioxidant is provided under the brand number 445; the nano inorganic filler is nano zinc oxide.
5. The gasket of claim 3, wherein the gasket has a shrinkage of 1.8 to 2.3%, a tensile strength at break of 18 to 22MPa, an elongation at break of not less than 200%, a hardness of 75 to 85SHA, a tear strength of 38 to 55KN/m, and a compression set at 150 ℃ of not more than 26%.
6. The method for producing a gasket according to any one of claims 1 to 5, comprising the steps of: sequentially carrying out calendering, semi-finished product extrusion molding and one-step vulcanization molding on the prepared raw materials mixed according to the proportion;
the one-step vulcanization molding process is only carried out for one-step vulcanization, and the one-step vulcanization is carried out for 5-10min at the temperature of 180-190 ℃.
7. The method of claim 6, wherein the primary vulcanization is carried out at 185 ℃ for 5 to 10min.
8. Use of a gasket according to any of claims 1-5, wherein the gasket is used in a heat exchanger.
9. Use according to claim 8, wherein the gasket is used in an oilfield mixed oil heat exchanger.
10. A heat exchanger characterized in that it has a gasket according to any one of claims 1 to 5.
11. The heat exchanger of claim 10, wherein the heat exchanger is an oilfield mixed oil heat exchanger.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103396591A (en) * | 2013-06-14 | 2013-11-20 | 中国船舶重工集团公司第七二五研究所 | Oilfield ultrahigh-pressure acid-resistant rubber seal material and preparation method thereof |
| CN103804738A (en) * | 2014-03-05 | 2014-05-21 | 南京金三力橡塑有限公司 | High-temperature stator rubber material and preparation method thereof |
| CN109824954A (en) * | 2017-11-23 | 2019-05-31 | 山东高洁环保科技有限公司 | A kind of hydrogenated nitrile-butadiene rubber preparation that intensity is reinforced |
| CN110591191A (en) * | 2019-10-17 | 2019-12-20 | 宁波市北仑优联特橡塑制品有限公司 | Hydrogenated nitrile rubber for automobile sealing ring and preparation method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102005062075A1 (en) * | 2005-12-22 | 2007-06-28 | Lanxess Deutschland Gmbh | Multicomponent system containing a thermoplastic and a rubber component, e.g. for use in cylinder head seals or rollers, contains at least two peroxide cross-linkers with different 1-hour decomposition temperatures |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103396591A (en) * | 2013-06-14 | 2013-11-20 | 中国船舶重工集团公司第七二五研究所 | Oilfield ultrahigh-pressure acid-resistant rubber seal material and preparation method thereof |
| CN103804738A (en) * | 2014-03-05 | 2014-05-21 | 南京金三力橡塑有限公司 | High-temperature stator rubber material and preparation method thereof |
| CN109824954A (en) * | 2017-11-23 | 2019-05-31 | 山东高洁环保科技有限公司 | A kind of hydrogenated nitrile-butadiene rubber preparation that intensity is reinforced |
| CN110591191A (en) * | 2019-10-17 | 2019-12-20 | 宁波市北仑优联特橡塑制品有限公司 | Hydrogenated nitrile rubber for automobile sealing ring and preparation method thereof |
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