A highly wear-resistant hydrogenated nitrile rubber for flushing pipe packing

Abstract

The invention relates to the technical field of rubber materials, and proposes a highly wear-resistant hydrogenated nitrile rubber for flushing pipe packing, comprising the following components in parts by weight: 60-100 parts of a first hydrogenated nitrile rubber, 30-60 parts of aramid pulp premix, 10-20 parts of carbon nanotubes, 15-30 parts of carbon black, 3-10 parts of a plasticizer, 5.5-12 parts of an active agent, 1-3 parts of an antioxidant, 3-5 parts of a first vulcanizing agent, and 1.5-3 parts of a cross-linking agent; the aramid pulp premix comprises the following components in parts by weight: 35-45 parts of aramid pulp, 30-50 parts of a second hydrogenated nitrile rubber, and 5-15 parts of phenyl silicone rubber. Through the above technical scheme, the problem of poor wear resistance and tensile strength of hydrogenated nitrile rubber for flushing pipe packing in the related art is solved.

Description

Technical Field

[0001] The invention relates to the technical field of rubber materials, and in particular to a highly wear-resistant hydrogenated nitrile rubber for flushing pipe packing. Background Art

[0002] The flushing packing of the oil pumping unit is an important component that plays a sealing role in the oil pumping process. Its main function is to prevent crude oil leakage and ensure the normal operation and safe production of the oil pumping unit. However, in actual use, the flushing packing of the oil pumping unit often faces serious wear problems. When the flushing packing is severely worn, oil leakage will occur. This will not only cause a waste of crude oil, but also bring great pressure to the environment.

[0003] At present, high-end flushing pipe packings at home and abroad are usually made of aramid fiber braid as the skeleton material, nitrile rubber or hydrogenated nitrile rubber as the elastic material, and aramid fiber and other wear-resistant materials are added to the rubber. Although aramid fiber has many excellent properties such as high strength and high modulus, its high surface inertness will lead to poor bonding ability with rubber. This lack of bonding ability will directly affect the wear resistance and tensile strength of the rubber used for flushing pipe packing, thereby reducing the service life of the flushing pipe packing. Therefore, it is of great significance to develop a highly wear-resistant hydrogenated nitrile rubber for flushing pipe packing. Summary of the invention

[0004] The invention provides a highly wear-resistant hydrogenated nitrile rubber for flushing pipe packing, which solves the problem of poor wear resistance and tensile strength of hydrogenated nitrile rubber for flushing pipe packing in the related art.

[0005] The technical solution of the present invention is as follows:

[0006] The invention provides a highly wear-resistant hydrogenated nitrile rubber for flushing pipe packing, comprising the following components in parts by weight: 60-100 parts of a first hydrogenated nitrile rubber, 30-60 parts of an aramid pulp premix, 10-20 parts of carbon nanotubes, 15-30 parts of carbon black, 3-10 parts of a plasticizer, 5.5-12 parts of an activator, 1-3 parts of an antioxidant, 3-5 parts of a first vulcanizing agent, and 1.5-3 parts of a cross-linking aid;

[0007] The aramid pulp premix comprises the following components in parts by weight: 35-45 parts of aramid pulp, 30-50 parts of second hydrogenated nitrile rubber, and 5-15 parts of phenyl silicone rubber.

[0008] As a further technical solution, the phenyl silicone rubber is a medium-phenyl silicone rubber, and the phenyl content of the medium-phenyl silicone rubber is 15wt%~20wt%.

[0009] In the present invention, the inventors found that the phenyl functional group in the phenyl silicone rubber has an important influence on the combination of the second hydrogenated nitrile rubber and the aramid pulp. When the phenyl silicone rubber is a medium phenyl silicone rubber with a phenyl content of 15wt% to 20wt%, it helps to further improve the wear resistance and tensile strength of the hydrogenated nitrile rubber for flushing pipe packing.

[0010] As a further technical solution, the plasticizer is an ester plasticizer.

[0011] In the present invention, the ester plasticizer includes one or more of TP-95, TOTM, DOA, DOTP, DOP, and DBP, preferably TP-95.

[0012] As a further technical solution, the active agent includes one or both of zinc oxide and stearic acid.

[0013] In the present invention, the active agent is preferably zinc oxide and stearic acid. When the active agent is zinc oxide and stearic acid, the weight ratio of zinc oxide to stearic acid is 2.5 to 20:1. Preferably, the weight ratio of zinc oxide to stearic acid is 10:1.

[0014] As a further technical solution, the first vulcanizing agent is a peroxide vulcanizing agent.

[0015] In the present invention, the first vulcanizing agent is a peroxide vulcanizing agent, and the peroxide vulcanizing agent includes one or more of DTBP, DCP, DBPH, and TMCH, preferably DCP.

[0016] As a further technical solution, the antioxidant includes one or more of antioxidant MB, antioxidant 2246, antioxidant 264, and antioxidant AW.

[0017] In the present invention, the antioxidant is preferably antioxidant MB and antioxidant 2246. When the antioxidant is antioxidant MB and antioxidant 2246, the weight ratio of antioxidant MB to antioxidant 2246 is 0.5~3:1. Preferably, the weight ratio of antioxidant MB to antioxidant 2246 is 1:1.

[0018] As a further technical solution, the auxiliary cross-linking agent includes one or more of TAIC, TMPTMA, A-151, and HVA-2.

[0019] In the present invention, the auxiliary cross-linking agent is preferably TAIC.

[0020] As a further technical solution, the aramid pulp premix further includes 1 to 1.5 parts of tributyl borate.

[0021] In the present invention, the addition of tributyl borate is beneficial to further improve the combination of hydrogenated nitrile rubber and aramid pulp, thereby further improving the wear resistance and tensile strength of hydrogenated nitrile rubber for flushing pipe packing.

[0022] As a further technical solution, the aramid pulp premix further includes 1 to 5.5 parts of an antioxidant, 4 to 8 parts of a lubricant, and 0.5 to 1 part of a second vulcanizing agent.

[0023] As a further technical solution, the antioxidant includes one or more of antioxidant 168, antioxidant 626, antioxidant 1076, antioxidant 1010, and antioxidant 264.

[0024] In the present invention, the antioxidant is preferably antioxidant 168 and antioxidant 1076. When the antioxidant is antioxidant 168 and antioxidant 1076, the weight ratio of antioxidant 168 to antioxidant 1076 is 0.5~3:1. Preferably, the weight ratio of antioxidant 168 to antioxidant 1076 is 1:1.

[0025] As a further technical solution, the lubricant includes one or more of calcium carbonate, clay, mica powder, and talcum powder.

[0026] In the present invention, the lubricant is preferably talc.

[0027] As a further technical solution, the second vulcanizing agent includes one or more of DCP, DTBP, TMTD, and TETD.

[0028] In the present invention, the second vulcanizing agent is preferably DCP.

[0029] As a further technical solution, the preparation method of the aramid pulp premix comprises the following steps: mixing and kneading the components of the aramid pulp premix except the aramid pulp, extruding and granulating to obtain pellets, and extruding and reacting the pellets with aramid pulp to obtain the aramid pulp premix.

[0030] In the present invention, aramid pulp is pre-dispersed in hydrogenated nitrile rubber by co-extrusion, so that the aramid pulp can be evenly dispersed in the subsequent preparation process, thereby further improving the wear resistance and tensile strength of hydrogenated nitrile rubber for flushing pipe packing.

[0031] As a further technical solution, during the extrusion granulation, the temperature is 70-90°C.

[0032] As a further technical solution, during the extrusion reaction, the temperature is 150-170°C.

[0033] The present invention also proposes a preparation method of the highly wear-resistant hydrogenated nitrile rubber for flushing pipe packing, comprising the following steps: plasticizing a first hydrogenated nitrile rubber and an aramid pulp premix, adding an active agent and an antioxidant for mixing, adding carbon black, a plasticizer and carbon nanotubes for mixing, removing the glue, adding a first vulcanizing agent and a cross-linking agent for thinning, and sheeting to obtain the highly wear-resistant hydrogenated nitrile rubber.

[0034] The working principle and beneficial effects of the present invention are:

[0035] In the present invention, the combination ability of hydrogenated nitrile rubber and aramid pulp is enhanced by optimizing the component composition, thereby significantly improving the wear resistance and tensile strength of hydrogenated nitrile rubber for flushing pipe packing, wherein:

[0036] (1) Aramid pulp premix uses phenyl silicone rubber as a bridging agent, which not only improves the bonding ability of aramid pulp and hydrogenated nitrile rubber, but also forms a cross-structure, thereby improving the wear resistance and tensile strength of hydrogenated nitrile rubber for flushing pipe packing;

[0037] (2) Carbon nanotubes as functional fillers can improve the wear resistance and tensile strength of hydrogenated nitrile rubber used in flushing pipe packing. DETAILED DESCRIPTION

[0038] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] In the following examples and comparative examples, unless otherwise specified, the model of hydrogenated nitrile rubber is ARLANXEO 4367; the specific surface area of ​​aramid pulp is 9-15 m 2 / g, length is 0.5~1.5mm; the diameter of the carbon nanotubes is 1~2nm, and the length is 20~30μm; the model of carbon black is Alun carbon black N550; the lubricant is talcum powder, and its average particle size is 50μm.

[0040] Example 1

[0041] A preparation method of highly wear-resistant hydrogenated nitrile rubber for flushing pipe packing comprises the following steps: by weight, 80 parts of hydrogenated nitrile rubber and 50 parts of aramid pulp premix are plasticized for 5 minutes, 10 parts of zinc oxide, 1 part of stearic acid, 1.5 parts of antioxidant MB and 1.5 parts of antioxidant 2246 are added and mixed for 3 minutes, 20 parts of carbon black, 5 parts of TP-95 plasticizer and 15 parts of carbon nanotubes are added and mixed for 5 minutes, a rubber removal open mill is rolled, 4 parts of DCP vulcanizing agent and 2 parts of TAIC cross-linking agent are added and thinly packaged for 5 times, and sheeting is performed to obtain highly wear-resistant hydrogenated nitrile rubber;

[0042] Wherein, based on 100 parts of aramid pulp premix, the aramid pulp premix includes the following components in parts by weight: 40 parts of aramid pulp, 40 parts of hydrogenated nitrile rubber, 10 parts of medium phenyl silicone rubber (phenyl content is 15wt%, weight average molecular weight is 650,000), 2.75 parts of antioxidant 168, 2.75 parts of antioxidant 1076, 4 parts of talc, and 0.5 parts of vulcanizing agent DCP;

[0043] The preparation method of aramid pulp premix comprises the following steps: mixing and kneading the components of the aramid pulp premix except aramid pulp, extruding and granulating at 80°C to obtain pellets, and extruding and reacting the pellets with aramid pulp at 160°C to obtain the aramid pulp premix.

[0044] Example 2

[0045] A preparation method of highly wear-resistant hydrogenated nitrile rubber for flushing pipe packing comprises the following steps: by weight, 60 parts of hydrogenated nitrile rubber and 60 parts of aramid pulp premix are plasticized for 5 minutes, 5 parts of zinc oxide, 0.5 parts of stearic acid, 0.5 parts of antioxidant MB and 0.5 parts of antioxidant 2246 are added and mixed for 3 minutes, 15 parts of carbon black, 3 parts of TP-95 plasticizer and 10 parts of carbon nanotubes are added and mixed for 5 minutes, a rubber removal open mill is rolled, 3 parts of DCP vulcanizing agent and 1.5 parts of TAIC cross-linking agent are added and thinly packaged for 5 times, and sheeting is performed to obtain highly wear-resistant hydrogenated nitrile rubber;

[0046] Wherein, based on 100 parts of aramid pulp premix, the aramid pulp premix includes the following components in parts by weight: 35 parts of aramid pulp, 50 parts of hydrogenated nitrile rubber, 5 parts of medium phenyl silicone rubber (phenyl content is 15wt%, weight average molecular weight is 650,000), 1 part of antioxidant 168, 1 part of antioxidant 1076, 7.5 parts of talc, and 0.5 part of vulcanizing agent DCP;

[0047] The preparation method of aramid pulp premix comprises the following steps: mixing and kneading the components of the aramid pulp premix except aramid pulp, extruding and granulating at 70°C to obtain pellets, and extruding and reacting the pellets with aramid pulp at 150°C to obtain the aramid pulp premix.

[0048] Example 3

[0049] A preparation method of highly wear-resistant hydrogenated nitrile rubber for flushing pipe packing comprises the following steps: by weight, 100 parts of hydrogenated nitrile rubber and 30 parts of aramid pulp premix are plasticized for 5 minutes, 10 parts of zinc oxide, 2 parts of stearic acid, 1.5 parts of antioxidant MB and 1.5 parts of antioxidant 2246 are added and mixed for 3 minutes, 30 parts of carbon black, 10 parts of TP-95 plasticizer and 20 parts of carbon nanotubes are added and mixed for 5 minutes, a rubber removal open mill is rolled, 5 parts of DCP vulcanizing agent and 3 parts of TAIC cross-linking agent are added and thinly packaged for 5 times, and sheeting is performed to obtain highly wear-resistant hydrogenated nitrile rubber;

[0050] Wherein, based on 100 parts of aramid pulp premix, the aramid pulp premix includes the following components in parts by weight: 45 parts of aramid pulp, 30 parts of hydrogenated nitrile rubber, 15 parts of medium phenyl silicone rubber (phenyl content is 15wt%, weight average molecular weight is 650,000), 0.5 parts of antioxidant 168, 0.5 parts of antioxidant 1076, 8 parts of talc, and 1 part of vulcanizing agent DCP;

[0051] The preparation method of aramid pulp premix comprises the following steps: mixing and kneading the components of the aramid pulp premix except aramid pulp, extruding and granulating at 90°C to obtain pellets, and extruding and reacting the pellets with aramid pulp at 170°C to obtain the aramid pulp premix.

[0052] Example 4

[0053] The only difference between this embodiment and Embodiment 1 is that, in this embodiment, based on 100 parts of aramid pulp premix, the aramid pulp premix includes the following components in parts by weight: 40 parts of aramid pulp, 40 parts of hydrogenated nitrile rubber, 10 parts of medium phenyl silicone rubber (phenyl content is 15wt%, weight average molecular weight is 650,000), 1 part of tributyl borate, 2.25 parts of antioxidant 168, 2.25 parts of antioxidant 1076, 4 parts of talc, and 0.5 parts of vulcanizing agent DCP.

[0054] Example 5

[0055] The only difference between this embodiment and Embodiment 1 is that, in this embodiment, based on 100 parts of aramid pulp premix, the aramid pulp premix includes the following components in parts by weight: 40 parts of aramid pulp, 40 parts of hydrogenated nitrile rubber, 10 parts of medium phenyl silicone rubber (phenyl content is 15wt%, weight average molecular weight is 650,000), 1.5 parts of tributyl borate, 2 parts of antioxidant 168, 2 parts of antioxidant 1076, 4 parts of talc, and 0.5 parts of vulcanizing agent DCP.

[0056] Example 6

[0057] The only difference between this embodiment and embodiment 1 is that in this embodiment, the medium phenyl silicone rubber in the aramid pulp premix is ​​replaced by an equal amount of low phenyl silicone rubber (phenyl content of 8wt% and weight average molecular weight of 650,000).

[0058] Example 7

[0059] The only difference between this embodiment and embodiment 1 is that in this embodiment, the medium phenyl silicone rubber in the aramid pulp premix is ​​replaced by an equal amount of high phenyl silicone rubber (phenyl content of 30wt% and weight average molecular weight of 650,000).

[0060] Example 8

[0061] The only difference between this embodiment and embodiment 1 is that in this embodiment, the weight of carbon nanotubes added is 10 parts.

[0062] Example 9

[0063] The only difference between this embodiment and embodiment 1 is that in this embodiment, the weight of carbon nanotubes added is 20 parts.

[0064] Comparative Example 1

[0065] The only difference between this comparative example and Example 1 is that in this comparative example, the aramid pulp premix is ​​replaced with an equal amount of aramid pulp.

[0066] Comparative Example 2

[0067] A method for preparing highly wear-resistant hydrogenated nitrile rubber for flushing pipe packing comprises the following steps: by weight, 80 parts of hydrogenated nitrile rubber, 5 parts of medium phenyl silicone rubber (phenyl content is 15wt%, weight average molecular weight is 650,000), and 45 parts of aramid pulp premix are plasticized for 5 minutes, 10 parts of zinc oxide, 1 part of stearic acid, 1.5 parts of antioxidant MB and 1.5 parts of antioxidant 2246 are added and mixed for 3 minutes, 20 parts of carbon black, 5 parts of TP-95 plasticizer and 15 parts of carbon nanotubes are added and mixed for 5 minutes, a rubber removal open mill is rolled, 4 parts of DCP vulcanizer and 2 parts of TAIC cross-linking agent are added and thinly packaged for 5 times, and sheeting is performed to obtain highly wear-resistant hydrogenated nitrile rubber;

[0068] Wherein, based on 90 parts of aramid pulp premix, the aramid pulp premix includes the following components in parts by weight: 40 parts of aramid pulp, 40 parts of hydrogenated nitrile rubber, 2.75 parts of antioxidant 168, 2.75 parts of antioxidant 1076, 4 parts of talc, and 0.5 parts of vulcanizing agent DCP;

[0069] The preparation method of aramid pulp premix comprises the following steps: mixing and kneading the components of the aramid pulp premix except aramid pulp, extruding and granulating at 80°C to obtain pellets, and extruding and reacting the pellets with aramid pulp at 160°C to obtain the aramid pulp premix.

[0070] Comparative Example 3

[0071] The only difference between this comparative example and Example 1 is that in this comparative example, no carbon nanotubes are added.

[0072] Comparative Example 4

[0073] The only difference between this comparative example and Example 1 is that in this comparative example, based on 90 parts of aramid pulp premix, the aramid pulp premix includes the following components in parts by weight: 40 parts of aramid pulp, 40 parts of hydrogenated nitrile rubber, 2.75 parts of antioxidant 168, 2.75 parts of antioxidant 1076, 4 parts of talc, and 0.5 parts of vulcanizing agent DCP.

[0074] The following performance tests were performed on the highly wear-resistant hydrogenated nitrile rubbers prepared in Examples 1 to 9 and Comparative Examples 1 to 4:

[0075] ①Relative volume wear: refer to GB / T 9867-2008 "Determination of wear resistance of vulcanized rubber or thermoplastic rubber (rotating roller abrader method)" to test the relative volume wear. Among them, method A is used for testing, and the average value of the results of 3 samples is taken as the final result, and the result is rounded to two decimal places;

[0076] ②Tensile strength: refer to GB / T 528-2009 “Determination of tensile stress-strain properties of vulcanized rubber or thermoplastic rubber” to test the tensile strength. The specimen is a type 1 dumbbell specimen, and the median of the results of the three specimens is taken as the final result. The result is rounded to two decimal places.

[0077] The test results are shown in Table 1 below.

[0078] Table 1 Performance test results

[0079]

[0080] Comparison between Example 1 and Comparative Example 1 shows that when aramid pulp is added in the form of aramid pulp premix, the wear resistance and tensile strength of hydrogenated nitrile rubber for flushing pipe packing can be significantly improved. Comparison between Example 1 and Comparative Example 2 shows that compared with directly adding phenyl silicone rubber when preparing highly wear-resistant hydrogenated nitrile rubber, the use of phenyl silicone rubber to prepare aramid pulp premix can significantly improve the wear resistance and tensile strength of hydrogenated nitrile rubber for flushing pipe packing. Comparison between Example 1 and Comparative Example 3 shows that the addition of carbon nanotubes can significantly improve the wear resistance and tensile strength of hydrogenated nitrile rubber for flushing pipe packing. Comparison between Example 1 and Comparative Example 4 shows that the addition of phenyl silicone rubber in aramid pulp premix can significantly improve the wear resistance and tensile strength of hydrogenated nitrile rubber for flushing pipe packing.

[0081] Comparison between Example 1 and Example 4-5 shows that the addition of tributyl borate in the aramid pulp premix helps to further improve the wear resistance and tensile strength of hydrogenated nitrile rubber for flushing pipe packing. Comparison between Example 1 and Example 6-7 shows that when the phenyl silicone rubber is a medium phenyl silicone rubber with a phenyl content of 15wt%-20wt%, it helps to further improve the wear resistance and tensile strength of hydrogenated nitrile rubber for flushing pipe packing.

[0082] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A highly wear-resistant hydrogenated nitrile rubber for flushing pipe packing, characterized in that: The invention comprises the following components in parts by weight: 60-100 parts of the first hydrogenated nitrile rubber, 30-60 parts of aramid pulp premix, 10-20 parts of carbon nanotubes, 15-30 parts of carbon black, 3-10 parts of plasticizer, 5.5-12 parts of activator, 1-3 parts of antioxidant, 3-5 parts of the first vulcanizing agent, and 1.5-3 parts of auxiliary cross-linking agent; The aramid pulp premix comprises the following components in parts by weight: 35-45 parts of aramid pulp, 30-50 parts of second hydrogenated nitrile rubber, and 5-15 parts of phenyl silicone rubber; The phenyl silicone rubber is a medium-phenyl silicone rubber, and the phenyl content of the medium-phenyl silicone rubber is 15wt%-20wt%.

2. The highly wear-resistant hydrogenated nitrile rubber for flushing pipe packing according to claim 1, characterized in that: The plasticizer is an ester plasticizer.

3. The highly wear-resistant hydrogenated nitrile rubber for flushing pipe packing according to claim 1, characterized in that: The active agent includes one or both of zinc oxide and stearic acid.

4. The highly wear-resistant hydrogenated nitrile rubber for flushing pipe packing according to claim 1, characterized in that: The first vulcanizing agent is a peroxide vulcanizing agent.

5. The highly wear-resistant hydrogenated nitrile rubber for flushing pipe packing according to claim 1, characterized in that: The auxiliary cross-linking agent includes one or more of TAIC, TMPTMA, A-151, and HVA-2.

6. A highly wear-resistant hydrogenated nitrile rubber for flushing pipe packing according to any one of claims 1 to 5, characterized in that: The aramid pulp premix further includes 1 to 1.5 parts of tributyl borate.

7. A highly wear-resistant hydrogenated nitrile rubber for flushing pipe packing according to any one of claims 1 to 5, characterized in that: The aramid pulp premix further comprises 1 to 5.5 parts of an antioxidant, 4 to 8 parts of a lubricant, and 0.5 to 1 part of a second vulcanizing agent.

8. The highly wear-resistant hydrogenated nitrile rubber for flushing pipe packing according to claim 7, characterized in that: The preparation method of the aramid pulp premix comprises the following steps: mixing and kneading the components of the aramid pulp premix except the aramid pulp, extruding and granulating to obtain pellets, and extruding and reacting the pellets with aramid pulp to obtain the aramid pulp premix.

9. The highly wear-resistant hydrogenated nitrile rubber for flushing pipe packing according to claim 8, characterized in that: During the extrusion reaction, the temperature is 150-170°C.

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