CN117050400A - Wear-resistant pressure-resistant rubber compound for oil well sealing ring and preparation method thereof - Google Patents
Wear-resistant pressure-resistant rubber compound for oil well sealing ring and preparation method thereof Download PDFInfo
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- CN117050400A CN117050400A CN202311073960.6A CN202311073960A CN117050400A CN 117050400 A CN117050400 A CN 117050400A CN 202311073960 A CN202311073960 A CN 202311073960A CN 117050400 A CN117050400 A CN 117050400A
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- rubber
- oil well
- pressure
- wear
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- 229920001971 elastomer Polymers 0.000 title claims abstract description 48
- 150000001875 compounds Chemical class 0.000 title claims abstract description 23
- 239000003129 oil well Substances 0.000 title claims abstract description 23
- 238000007789 sealing Methods 0.000 title claims abstract description 22
- 238000002360 preparation method Methods 0.000 title claims description 8
- 238000004073 vulcanization Methods 0.000 claims abstract description 12
- 238000013329 compounding Methods 0.000 claims abstract description 8
- 239000004014 plasticizer Substances 0.000 claims abstract description 7
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 6
- 239000012744 reinforcing agent Substances 0.000 claims abstract description 6
- 238000002156 mixing Methods 0.000 claims description 23
- 229920000459 Nitrile rubber Polymers 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 11
- 238000004140 cleaning Methods 0.000 claims description 9
- 238000005299 abrasion Methods 0.000 claims description 8
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 6
- HLBZWYXLQJQBKU-UHFFFAOYSA-N 4-(morpholin-4-yldisulfanyl)morpholine Chemical compound C1COCCN1SSN1CCOCC1 HLBZWYXLQJQBKU-UHFFFAOYSA-N 0.000 claims description 5
- UAUDZVJPLUQNMU-KTKRTIGZSA-N erucamide Chemical compound CCCCCCCC\C=C/CCCCCCCCCCCC(N)=O UAUDZVJPLUQNMU-KTKRTIGZSA-N 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- KUAZQDVKQLNFPE-UHFFFAOYSA-N thiram Chemical compound CN(C)C(=S)SSC(=S)N(C)C KUAZQDVKQLNFPE-UHFFFAOYSA-N 0.000 claims description 4
- UAUDZVJPLUQNMU-UHFFFAOYSA-N Erucasaeureamid Natural products CCCCCCCCC=CCCCCCCCCCCCC(N)=O UAUDZVJPLUQNMU-UHFFFAOYSA-N 0.000 claims description 3
- 235000021355 Stearic acid Nutrition 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 150000002825 nitriles Chemical class 0.000 claims description 3
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims description 3
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 239000008117 stearic acid Substances 0.000 claims description 3
- 239000011787 zinc oxide Substances 0.000 claims description 3
- 230000003014 reinforcing effect Effects 0.000 claims description 2
- QAZLUNIWYYOJPC-UHFFFAOYSA-M sulfenamide Chemical compound [Cl-].COC1=C(C)C=[N+]2C3=NC4=CC=C(OC)C=C4N3SCC2=C1C QAZLUNIWYYOJPC-UHFFFAOYSA-M 0.000 claims description 2
- 229960002447 thiram Drugs 0.000 claims description 2
- 239000006229 carbon black Substances 0.000 description 9
- 230000008569 process Effects 0.000 description 7
- 239000003921 oil Substances 0.000 description 6
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- KVNRLNFWIYMESJ-UHFFFAOYSA-N butyronitrile Chemical compound CCCC#N KVNRLNFWIYMESJ-UHFFFAOYSA-N 0.000 description 3
- 150000008363 butyronitriles Chemical class 0.000 description 3
- 238000012856 packing Methods 0.000 description 3
- 238000004513 sizing Methods 0.000 description 3
- 229910052717 sulfur Inorganic materials 0.000 description 3
- 239000011593 sulfur Substances 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 230000020169 heat generation Effects 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 241000872198 Serjania polyphylla Species 0.000 description 1
- 239000003849 aromatic solvent Substances 0.000 description 1
- 239000011203 carbon fibre reinforced carbon Substances 0.000 description 1
- 239000008139 complexing agent Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000005984 hydrogenation reaction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/04—Carbon
-
- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
-
- 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
- C08K5/09—Carboxylic acids; Metal salts thereof; Anhydrides thereof
-
- 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
- C08K5/16—Nitrogen-containing compounds
- C08K5/20—Carboxylic acid amides
-
- 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
- C08K5/36—Sulfur-, selenium-, or tellurium-containing compounds
- C08K5/39—Thiocarbamic acids; Derivatives thereof, e.g. dithiocarbamates
- C08K5/40—Thiurams, i.e. compounds containing groups
-
- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2296—Oxides; Hydroxides of metals of zinc
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
Abstract
The invention discloses a wear-resistant pressure-resistant rubber compound for a variable oil well sealing ring, which comprises the following components in percentage by weight: 45-50% of raw rubber, 40-45% of reinforcing agent, 0.4-3% of plasticizer, 4-8% of compounding agent and 2-4% of vulcanization accelerator. The product of the invention has excellent mechanical properties, better wear resistance and pressure resistance, and longer service life of the manufactured sealing ring.
Description
Technical Field
The invention belongs to the field of rubber, and particularly relates to a rubber compound for a wear-resistant pressure-resistant variable oil well sealing ring and a preparation method thereof.
Background
The sealing ring for oil well is commonly called packing, which is a sealing component for sealing the annular space between the polish rod and the packing box of the oil pumping well to prevent oil gas leakage, and in the working process of the oil well, the polish rod rubs with the packing for a long time, so that the sealing ring is required to have good pressure change performance and wear resistance to prevent the oil gas leakage after the abrasion of the sealing ring, and common products are made of hydrogenated butyronitrile, and have good performance but high price.
Hydrogenated nitrile rubber is a product obtained by hydrogenation saturation of carbon-carbon double bonds on molecular chains in nitrile rubber, has good oil resistance (good resistance to fuel oil, lubricating oil and aromatic solvents), and has the advantages of high price, poor processing performance, long vulcanization time, two-stage vulcanization and very strict production process requirements even though the hydrogenated nitrile rubber oil has such a large number of advantages.
If the common butyronitrile is used for replacing hydrogenated butyronitrile, the cost can be greatly reduced, but the common butyronitrile has poorer wear resistance and high temperature resistance and can not completely meet the requirement of the sealing ring product for the oil well on the use condition.
Disclosure of Invention
The invention provides the rubber compound for the wear-resistant pressure-resistant variable oil well sealing ring and the manufacturing method thereof, which are aimed at the problems.
In order to achieve the above purpose, the present invention provides the following technical solutions: the rubber compound for the wear-resistant pressure-resistant variable oil well sealing ring comprises the following components in parts by weight:
preferably, the composition of the rubber compound for the wear-resistant pressure-resistant oil well seal ring is as follows:
the raw rubber is nitrile rubber, the selected grades are Japanese JSON 220S and N215S, the wear resistance of the nitrile rubber is improved along with the improvement of the acrylonitrile content, but the low temperature resistance is poor, and the wear resistance of the nitrile rubber is improved by the mixed use of the raw rubber with high acrylonitrile content and extremely high acrylonitrile content.
The reinforcing agent is carbon black N326. Compared with the carbon black with the fine particle size of N330 and the like, N326 is special carbon black produced by using a new process, has good wear resistance and good tear resistance, and can prevent the product from falling off due to abrasion when the product is used. And because the Mooney viscosity of raw rubber is relatively good, the common high wear-resistant carbon black can cause poor dispersion of rubber materials due to rapid heat generation, and the specific surface area of the novel process carbon black is controlled by a series of technical means during production, so that a large amount of heat generation can not be generated during mixing, the mixing of the rubber compound is more sufficient, and the wear resistance of the rubber materials is improved to a certain extent.
The plasticizer is TP-95, the high and low temperature resistance of the plasticizer is very excellent, and the proper addition can improve the plasticity of the sizing material and the high and low temperature resistance of the sizing material.
The complexing agent is a mixture of zinc oxide, stearic acid, KY-405, WB212 and erucamide. Zinc oxide, stearic acid, KY-405 and WB212 are all compounding agents commonly used in conventional formulas, and can improve the ageing resistance of the rubber, the vulcanization speed and the dispersity. The invention particularly adds a large amount of erucic acid amide, and the erucic acid amide can form a layer of oil film on the surface of the product, so that the surface of the product is smooth, the friction coefficient between the product and a contact surface is reduced, the damage caused by friction is also reduced to a certain extent, and the service life of the product is prolonged.
The vulcanization accelerator is a mixture of S, thiuram accelerator (TMTD), sulfenamide accelerator (NS, CBS) and dithiodimorpholine (DTDM). By the combination of low sulfur and high promotion and the use of DTDM, a large amount of short monosulfur bonds are produced, and the pressure change performance and the wear resistance of the product can be greatly improved.
The invention also provides a preparation method of the rubber compound for the wear-resistant pressure-resistant variable oil well sealing ring, which comprises the following preparation steps according to the characteristics of the performance requirement of the formula.
(1) The preparation method comprises the following steps:
nitrile rubber- & gt reinforcing agent- & gt plasticizer- & gt compounding agent- & gt vulcanization accelerator;
(2) Firstly, mixing nitrile rubber and a compounding agent in an internal mixer for about 60s; adding a reinforcing agent, and mixing for about 90s; after cleaning the upper top bolt, continuously pressing the upper top bolt for banburying, and after the temperature reaches 135 ℃, cleaning the upper top bolt, and adding a plasticizer; finally, the rotation speed of the internal mixer is reduced, and then the internal mixer is mixed for about 60 seconds, and rubber is discharged after the rubber material reaches 145 ℃ to prepare A rubber compound for standby;
(3) And (3) mixing for the second time, adding the vulcanization accelerator into the mixed rubber A, mixing for 60-90 seconds, cleaning, mixing again for 30-60 seconds, and discharging the mixed rubber A for standby after full mixing and dispersing.
The invention adopts the nitrile rubber with good wear resistance, and is matched with N326 new process carbon black for reinforcement filling, and adopts various methods to improve the dispersibility of the rubber material, improve the smoothness of the rubber material and the like to improve the wear resistance of the nitrile rubber. The product of the invention has excellent wear resistance, has relatively low pressure change and ageing resistance, and can effectively prolong the service life of the sealing ring.
The invention solves the problems of poor wear resistance and high temperature difference resistance of the common nitrile rubber through the formula design, component matching and mixing process, so that the manufactured sealing ring can meet the use working conditions of a pumping well with lower requirements and better working environment to replace the use of partially hydrogenated nitrile. The invention uses common butyronitrile to replace hydrogenated butyronitrile, thereby greatly reducing the use cost.
Detailed Description
The following description of the technical solutions in the embodiments of the present invention will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Examples 1 to 4
The rubber compound for the abrasion-resistant pressure-resistant variable oil well sealing ring according to the present invention was produced according to the following procedure.
And (3) glue preparation, namely weighing raw materials accurately according to actual operation multiples of the internal mixer in sequence according to the proportion of the table 1, and placing the raw materials for later use.
Firstly, mixing nitrile rubber and a compounding agent in an internal mixer for about 60s; adding a reinforcing agent, and mixing for about 90s; after cleaning the upper top bolt, continuously pressing the upper top bolt for banburying, and after the temperature reaches 135 ℃, cleaning the upper top bolt, and adding a plasticizer; finally, the rotation speed of the internal mixer is reduced, and then the internal mixer is mixed for about 60 seconds, and rubber is discharged after the rubber material reaches 145 ℃ to prepare A rubber compound for standby;
and (3) mixing for the second time, adding the vulcanization accelerator into the mixed rubber A, mixing for 60-90 seconds, cleaning, mixing again for 30-60 seconds, and discharging the mixed rubber A for standby after full mixing and dispersing.
Table 1 shows the proportions of the components in examples 1 to 4 in terms of mass fraction thereof.
TABLE 1
Table 2 shows the mixing times for examples 1-4
TABLE 2
Table 3 shows the performance parameters of the rubber compounds for the seal rings of the abrasion-resistant and pressure-resistant oil wells prepared in examples 1 to 4.
TABLE 3 Table 3
As can be seen from Table 3, the rubber compound for the abrasion-resistant and pressure-resistant oil well sealing ring has the following characteristics:
firstly, the nitrile rubber with high acrylonitrile content is used as main rubber, the nitrile rubber has excellent mechanical properties, and the tensile strength obtained in the four embodiments is above 20 MPa. Meanwhile, the abrasion resistance of all four examples passed the test. The invention adopts an effective vulcanization system, controls the sulfur dosage to be not more than 0.3 part by mass, and can meet the heat-resistant requirement of 120 ℃ under special cooperation. Meanwhile, N326 new process carbon black is adopted, the corresponding mixing process is optimized and matched, and through the change of the feeding sequence, the dispersion of the carbon black is improved, and the wear resistance of the sizing material is greatly improved by using the combination of erucamide and low sulfur and high promotion. In actual production, reference should be made to the kneading method provided by the invention. The hardness requirements of the four embodiments provided by the invention are 80+/-5 ℃, and for the rubber materials with lower hardness requirements, experiments can be carried out by reducing the carbon black dosage, so that the lower wear resistance than the embodiment can be theoretically obtained.
The rubber compound prepared by the invention has excellent mechanical properties, excellent wear resistance and pressure resistance, can meet the use condition of an oil well sealing ring, has longer service life, and is suitable for being used as the wear-resistant pressure-resistant oil well sealing ring.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. A rubber compound for a wear-resistant pressure-resistant variable oil well sealing ring is characterized in that according to mass fraction,
the components are as follows:
2. the rubber compound for the abrasion-resistant pressure-resistant variable oil well sealing ring according to claim 1, wherein the raw rubber is nitrile rubber, and the selected grades are JSR N220S and N215S.
3. The rubber compound for a wear-resistant and pressure-resistant oil well seal ring according to claim 1, wherein the reinforcing agent is N326.
4. The rubber compound for a wear-resistant and pressure-resistant oil well seal ring according to claim 1, wherein the plasticizer is TP-95.
5. The rubber compound for a wear-resistant and pressure-resistant oil well seal ring according to claim 1, wherein the compounding agent is a mixture of zinc oxide, stearic acid, KY405, WB212 and erucamide.
6. The rubber compound for a wear-resistant and pressure-resistant oil well seal ring according to claim 1, wherein the vulcanization accelerator is a mixture of S, thiuram accelerator (TMTD), sulfenamide accelerator (NS, CBS) and dithiodimorpholine (DTDM).
7. The method for preparing the rubber compound for the abrasion-resistant and pressure-resistant oil well seal ring according to any one of claims 1 to 6, which is characterized in that: the method sequentially comprises the following steps of:
(1) The preparation method comprises the following steps:
nitrile rubber- & gt reinforcing agent- & gt plasticizer- & gt compounding agent- & gt vulcanization accelerator;
(2) Firstly, mixing nitrile rubber and a compounding agent in an internal mixer for about 60s; adding a reinforcing agent, and mixing for about 90s; after cleaning the upper top bolt, continuously pressing the upper top bolt for banburying, and after the temperature reaches 135 ℃, cleaning the upper top bolt, and adding a plasticizer; finally, the rotation speed of the internal mixer is reduced, and then the internal mixer is mixed for about 60 seconds, and rubber is discharged after the rubber material reaches 145 ℃ to prepare A rubber compound for standby;
(3) And (3) mixing for the second time, adding the vulcanization accelerator into the mixed rubber A, mixing for 60-90 seconds, cleaning, mixing again for 30-60 seconds, and discharging the mixed rubber A for standby after full mixing and dispersing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311073960.6A CN117050400A (en) | 2023-08-24 | 2023-08-24 | Wear-resistant pressure-resistant rubber compound for oil well sealing ring and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311073960.6A CN117050400A (en) | 2023-08-24 | 2023-08-24 | Wear-resistant pressure-resistant rubber compound for oil well sealing ring and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117050400A true CN117050400A (en) | 2023-11-14 |
Family
ID=88662412
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311073960.6A Pending CN117050400A (en) | 2023-08-24 | 2023-08-24 | Wear-resistant pressure-resistant rubber compound for oil well sealing ring and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117050400A (en) |
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2023
- 2023-08-24 CN CN202311073960.6A patent/CN117050400A/en active Pending
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