Vulcanized stator rubber material and preparation method thereof

Abstract

The invention discloses a vulcanized stator rubber material and a preparation method thereof. The vulcanized stator rubber material is mainly prepared from the following raw materials in parts by weight: 100 parts of carboxy nitrile rubber; 1-6 parts of graphite phase carbon nitride nanosheets; 1 to 6 parts of an amidation accelerant; and 1-5 parts of an amidation dehydrating agent. Amino groups on the surfaces of the graphite-phase carbon nitride nanosheets and carboxyl groups of the carboxy nitrile rubber are subjected to cross-linking reaction under the action of the amidation accelerant, so that the internal friction and hysteresis effect of the vulcanized stator rubber material are reduced, the friction coefficient and the wear rate of the vulcanized stator rubber material are reduced, the wear resistance of the vulcanized stator rubber material is effectively improved, and the service life of the vulcanized stator rubber material is prolonged.

Description

Technical Field

[0001] The invention relates to a vulcanized stator rubber material and a preparation method thereof. Background Art

[0002] The adaptability of screw pump oil production is very wide. It can continuously optimize the steps of oil production and improve the operating efficiency of oil companies. In recent years, with the rapid development of new drilling technology such as high-pressure jet drilling, large-displacement horizontal wells, deep wells / ultra-deep wells, and offshore platform drilling, higher requirements have been placed on the sealing performance of screw pump seals. The medium conveyed by the oil production screw pump is generally untreated crude oil and oil-water mixture. This liquid has the following characteristics: it contains a lot of mud and impurities. At present, stator rubber is mostly made of nitrile rubber, carboxyl nitrile rubber, hydrogenated nitrile rubber and other materials. It is a crucial sealing component of the screw pump and also the weakest component. During the transportation process, the stator is cut by hard particles, which causes great wear on the stator and greatly shortens the service life of the stator rubber. Therefore, it is extremely urgent to study stator rubber materials with excellent wear resistance. Summary of the invention

[0003] The present invention is made in order to improve the problem of stator rubber seal failure caused by surface wear and tear of the stator rubber material, to achieve the ability to adapt to harsh oil production conditions in the use environment, and to have a longer service life.

[0004] As a first aspect of the present invention, it relates to a vulcanized stator rubber material, which is mainly prepared from the following raw materials in parts by weight:

[0005] 100 parts of carboxyl nitrile rubber; 1-6 parts of graphite phase carbon nitride nanosheets; 1-6 parts of amidation accelerator; 1-5 parts of amidation dehydrating agent.

[0006] In one or some preferred embodiments, the number of layers of the graphite phase carbon nitride nanosheets is 1-5.

[0007] In one or some preferred embodiments, the graphite phase carbon nitride nanosheets are prepared by the following method:

[0008] The blocky graphite carbon nitride, ammonium chloride and water are stirred and mixed evenly, poured into a reaction kettle and reacted at 150-200°C. After the reaction is completed, they are calcined at 300-400°C in a N2 atmosphere to obtain graphite carbon nitride nanosheets.

[0009] In one or some optional embodiments, the amidation promoter is ZnCl2, W(SO4)3, tetraisopropoxytitanium or 2-furanboric acid.

[0010] In one or some preferred embodiments, the amidation promoter is tetraisopropoxytitanium.

[0011] In one or some optional embodiments, the amidation dehydrating agent is N,N'-dicyclohexylcarbodiimide (ie DCC), N,N'-diisopropylcarbodiimide (ie DIC), 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (ie EDC) or carbodiimide (ie EDCI).

[0012] In one or some preferred embodiments, the amidation dehydrating agent is carbodiimide (ie EDCI).

[0013] In one or some optional embodiments, the vulcanized stator rubber material further includes the following raw materials in parts by weight:

[0014] 3-6 parts of zinc oxide; 1-3 parts of stearic acid; 2-5 parts of vulcanization accelerator; 0.5-3 parts of antioxidant; 1-2 parts of sulfur; 40-80 parts of carbon black.

[0015] In one or some preferred embodiments, the weight proportion of the graphite phase carbon nitride nanosheets is 2.5-5.5 parts.

[0016] In one or some preferred embodiments, the weight proportion of the amidation accelerator is 2.5-5.5 parts.

[0017] In one or some preferred embodiments, the weight proportion of the amidation dehydrating agent is 2.5-4.5 parts.

[0018] In one or some preferred embodiments, the weight proportion of the vulcanization accelerator is 2-4 parts.

[0019] In one or some preferred embodiments, the antioxidant is present in an amount of 2-3 parts by weight.

[0020] In one or some preferred embodiments, the weight proportion of the carbon black is 55-70 parts.

[0021] As a second aspect of the present invention, it relates to a method for preparing the above-mentioned vulcanized stator rubber material, the method comprising:

[0022] The raw materials are fully mixed in an open mill according to their weight proportions. The mixing temperature is controlled at 45±5°C. The mixture is mixed until uniform and placed at room temperature for 8-16 hours. Finally, the mixed rubber is vulcanized using a flat vulcanizer at a vulcanization temperature of 130-170°C and a vulcanization time of 15-45 minutes.

[0023] In one or some preferred embodiments, the vulcanization temperature is 145-165° C., and the vulcanization time is 20-40 minutes.

[0024] The vulcanized stator rubber material provided by the present invention utilizes the amino groups on the surface of the graphite phase carbon nitride nanosheets to cause a cross-linking reaction with the carboxyl groups of the carboxyl nitrile rubber under the action of an amidation accelerator to form an amide bond, thereby enhancing the dispersibility and interaction of the graphite phase carbon nitride in the rubber material, and improving the cross-linking degree and physical and mechanical properties of the rubber material. Under the action of shear force, the graphite phase carbon nitride sheet slips and forms a transfer film inside, reducing the internal friction and hysteresis effect of the vulcanized stator rubber material, thereby reducing the friction coefficient and wear rate of the vulcanized stator rubber material, and effectively improving the wear resistance of the vulcanized stator rubber material.

[0025] The present invention mixes and heats bulk graphite phase carbon nitride and ammonium chloride, so that the bulk graphite phase carbon nitride expands, and ammonia molecules generated by the heated ammonium chloride are inserted into the interlayers of the graphite phase carbon nitride, thereby increasing the amino content in the graphite phase carbon nitride and weakening the van der Waals force between the graphite phase carbon nitride layers, thereby achieving effective exfoliation of the graphite phase carbon nitride and obtaining graphite phase carbon nitride nanosheets containing amino groups on the surface. DETAILED DESCRIPTION

[0026] The following is a detailed description of the embodiments of the present invention: The embodiments of the present invention are implemented on the premise of the technical solution of the present invention, and detailed implementation methods and processes are given, but the protection scope of the present invention is not limited to the following embodiments. The process parameters for which specific conditions are not specified in the following embodiments are generally based on conventional conditions.

[0027] The endpoints and any values ​​of the ranges disclosed in the present invention are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be regarded as specifically disclosed in the present invention.

[0028] The inventors implemented the relevant technical solutions with reference to patent CN114000147A and found that the preparation process of this technology needs to be placed in the vacuum chamber of the vacuum pulse arc coating equipment, the preparation operation is complicated, and the equipment requirements are high. The inventors implemented the relevant technical solutions with reference to patent CN110724321A and found that although the modification of graphene by grafting with silane coupling agent improves the dispersibility of graphene in rubber, it is impossible to achieve delamination of graphene sheets, resulting in more stacked graphene layers and larger microscopic sizes, which increases the intermolecular forces of graphene and reduces the sliding ability of sheets. The inventors implemented the relevant technical solutions with reference to patent CN201610767358.6 and found that this technology uses carbon black, white carbon black, carbon nanotubes, etc. as reinforcement and enhancers, and the stator rubber has higher tear strength and hardness, but it does not mention the improvement of the wear resistance and anti-wear properties of the stator rubber. The inventor implemented the relevant technical scheme with reference to patent CN200910072635.1, and found that the cost of using hydrogenated nitrile as the base rubber is higher than that of carboxyl nitrile rubber. At the same time, a large amount of carbon black is added in the technology, of which the proportion of carbon black is as high as about 30wt%, the friction between carbon black and the molecular chain increases, the heat generation increases rapidly, and the stability of use is difficult to guarantee. The inventor implemented the relevant technical scheme with reference to patent CN104262728A, and found that the cost of using hydrogenated nitrile as the base rubber is high, and no mention is made of the improvement of the wear resistance and anti-wear performance of the stator rubber. The inventor implemented the relevant technical scheme with reference to patent CN202210920231, and found that the technology disperses the graphite phase carbon nitride into the rubber through coordination bonds under the action of metal elements, thereby achieving efficient reinforcement of the continuous rubber phase, thereby avoiding the loss of rigidity of the PLA composite material caused by the soft and tough rubber, and no cross-linking reaction occurs with the rubber, and the degree of reinforcement is weak. The inventor implemented the relevant technical solution with reference to patent CN202010854539 and found that this technology mainly uses natural rubber as the stator matrix of the screw pump, and does not involve carboxyl nitrile rubber.

[0029] Based on the fact that none of the above can meet the inventor's expectations, after further research and development, the inventor found that two-dimensional (2D) nanomaterials have excellent mechanical properties, friction reduction and anti-wear properties due to their special layered structure, and are ideal lubricating materials to replace traditional extreme pressure and wear-resistant additives. Among them, graphite phase carbon nitride has a layered stacking result very similar to graphite, the interlayer bonding force is very weak, and the interlayer slip is very easy. It is a very excellent and commonly used lubricating additive; compared to traditional wear-resistant carbon black, graphene, hexagonal boron nitride, etc., the surface of graphite phase carbon nitride contains amino groups, which can react with carboxyl-containing nitrile rubber, improve the dispersibility of graphite phase carbon nitride in rubber, and further enhance the physical and mechanical properties and anti-wear properties of rubber. Therefore, the present invention is made.

[0030] It should be noted that the vulcanization accelerator used in the embodiment of the present invention is a commercially available product, such as vulcanization accelerator TMTD, vulcanization accelerator TBBS or vulcanization accelerator CZ. The antioxidant used in the embodiment of the present invention is a commercially available product, such as antioxidant MB, antioxidant RD or antioxidant 2246. The carbon black used in the embodiment of the present invention is a commercially available product, such as N660, N550 or N330.

[0031] It should be noted that the raw material information used in the embodiments of the present invention is shown in Table 1 below, the equipment information used is shown in Table 2 below, and the analysis items and methods used are shown in Table 3 below.

[0032] Table 1 Raw material information

[0033] Raw material name Specification Manufacturer Carboxylated nitrile rubber Commercially available Rayon Carbon Black Commercially available Tianjin Baochi Chemical Technology Co., Ltd. Melamine Analytical grade Shanghai MacLean Biochemical Technology Co., Ltd. Ammonium chloride Analytical grade Shanghai MacLean Biochemical Technology Co., Ltd. Zinc Oxide 99.7％ Dalian Zinc Oxide Co., Ltd. Stearic acid 99％ Guangzhou Tongjie Chemical Co., Ltd. Vulcanization accelerator Commercially available Lihe Chemical Co., Ltd. sulfur Analytical grade National Synthetic Rubber Quality Inspection and Testing Center Antioxidant Commercially available Baiyun Chemical Co., Ltd. Titanium Tetraisopropoxide Industrial Grade Jinan Mingyu Chemical Co., Ltd. Carbodiimide Industrial Grade Runfeng Chemical Co., Ltd.

[0034] Table 2 Equipment information table

[0035]

[0036] Table 3 Analysis items and methods

[0037]

[0038]

[0039] Example 1

[0040] Preparation of graphite phase carbon nitride nanosheets: melamine is placed in a porcelain boat and put into a tubular furnace, and the temperature is increased to 500-550°C at a heating rate of 5-10°C / min in a N2 atmosphere, and then calcined for 2 hours. After naturally cooling to room temperature, block graphite phase carbon nitride is obtained; block graphite phase carbon nitride, ammonium chloride, and water are stirred and mixed in a mass ratio of 1:3:500, poured into a reactor, reacted at 150-200°C for 12 hours, and after the reaction is completed, calcined at 300-400°C for 2 hours in a N2 atmosphere to obtain graphite phase carbon nitride nanosheets.

[0041] Preparation of vulcanized stator rubber material: 100 parts of carboxylated nitrile rubber, 1 part of graphite phase carbon nitride nanosheets, 4.5 parts of zinc oxide, 2 parts of stearic acid, 2.5 parts of vulcanization accelerator TMTD, 1 part of antioxidant MB, 50 parts of N660 carbon black, 2 parts of tetraisopropoxy titanium, and 2 parts of EDCI were mixed in an open mill for 20 minutes until uniform, and the temperature was controlled at 40±5°C during the mixing process. The obtained mixed rubber was placed at room temperature for 8 hours, and then vulcanized using a flat vulcanizer at a vulcanization temperature of 150°C and a vulcanization time of 20 minutes to obtain a vulcanized stator rubber material, the properties of which are shown in Table 4.

[0042] Example 2

[0043] Preparation of graphite phase carbon nitride nanosheets: Same as Example 1.

[0044] Preparation of vulcanized stator rubber material: 100 parts of carboxylated nitrile rubber, 3 parts of graphite phase carbon nitride nanosheets, 4 parts of zinc oxide, 2.5 parts of stearic acid, 3 parts of vulcanization accelerator TMTD, 2.5 parts of antioxidant MB, 70 parts of N660 carbon black, 3 parts of tetraisopropoxy titanium, and 5 parts of EDCI were mixed in an open mill for 20 minutes until uniform, and the temperature was controlled at 40±5°C during the mixing process. The obtained mixed rubber was placed at room temperature for 10 hours, and then vulcanized using a flat vulcanizer at a vulcanization temperature of 140°C and a vulcanization time of 45 minutes to obtain a vulcanized stator rubber material, the properties of which are shown in Table 4.

[0045] Example 3

[0046] Preparation of graphite phase carbon nitride nanosheets: Same as Example 1.

[0047] Preparation of vulcanized stator rubber material: 100 parts of carboxylated nitrile rubber, 2 parts of graphite phase carbon nitride nanosheets, 6 parts of zinc oxide, 3 parts of stearic acid, 3.5 parts of vulcanization accelerator TBBS, 0.5 parts of antioxidant RD, 40 parts of N550 carbon black, 1 part of tetraisopropoxy titanium, and 2 parts of EDCI were mixed in an open mill for 20 minutes until uniform, and the temperature was controlled at 40±5°C during the mixing process. The obtained mixed rubber was placed at room temperature for 9 hours, and then vulcanized using a flat vulcanizer at a vulcanization temperature of 170°C and a vulcanization time of 20 minutes to obtain a vulcanized stator rubber material, the properties of which are shown in Table 4.

[0048] Example 4

[0049] Preparation of graphite phase carbon nitride nanosheets: Same as Example 1.

[0050] Preparation of vulcanized stator rubber material: 100 parts of carboxylated nitrile rubber, 5.5 parts of graphite phase carbon nitride nanosheets, 5.5 parts of zinc oxide, 1.5 parts of stearic acid, 3 parts of vulcanization accelerator TBBS, 2 parts of antioxidant RD, 60 parts of N550 carbon black, 4.5 parts of tetraisopropoxy titanium, and 3 parts of EDCI were mixed in an open mill for 20 minutes until uniform, and the temperature was controlled at 40±5°C during the mixing process. The obtained mixed rubber was placed at room temperature for 12 hours, and then vulcanized using a flat vulcanizer at a vulcanization temperature of 155°C and a vulcanization time of 25 minutes to obtain a vulcanized stator rubber material, the properties of which are shown in Table 4.

[0051] Example 5

[0052] Preparation of graphite phase carbon nitride nanosheets: Same as Example 1.

[0053] Preparation of vulcanized stator rubber material: 100 parts of carboxylated nitrile rubber, 6 parts of graphite phase carbon nitride nanosheets, 4 parts of zinc oxide, 2.5 parts of stearic acid, 4 parts of vulcanization accelerator CZ, 1.5 parts of antioxidant 2246, 55 parts of N330 carbon black, 6 parts of tetraisopropoxy titanium, and 3.5 parts of EDCI were mixed in an open mill for 20 minutes until uniform, and the temperature was controlled at 40±5°C during the mixing process. The obtained mixed rubber was placed at room temperature for 16 hours, and then vulcanized using a flat vulcanizer at a vulcanization temperature of 165°C and a vulcanization time of 15 minutes to obtain a vulcanized stator rubber material, the properties of which are shown in Table 4.

[0054] Example 6

[0055] Preparation of graphite phase carbon nitride nanosheets: Same as Example 1.

[0056] Preparation of vulcanized stator rubber material: 100 parts of carboxylated nitrile rubber, 5 parts of graphite phase carbon nitride nanosheets, 3 parts of zinc oxide, 1.5 parts of stearic acid, 2 parts of vulcanization accelerator CZ, 2 parts of antioxidant 2246, 65 parts of N330 carbon black, 5 parts of tetraisopropoxy titanium, and 4 parts of EDCI were mixed in an open mill for 20 minutes until uniform, and the temperature was controlled at 40±5°C during the mixing process. The obtained mixed rubber was placed at room temperature for 14 hours, and then vulcanized using a flat vulcanizer at a vulcanization temperature of 160°C and a vulcanization time of 20 minutes to obtain a vulcanized stator rubber material, the properties of which are shown in Table 4.

[0057] Example 7

[0058] Preparation of graphite phase carbon nitride nanosheets: Same as Example 1.

[0059] Preparation of vulcanized stator rubber material: 100 parts of carboxylated nitrile rubber, 3 parts of graphite phase carbon nitride nanosheets, 4 parts of zinc oxide, 2.5 parts of stearic acid, 3 parts of vulcanization accelerator TBBS, 2.5 parts of antioxidant RD, 80 parts of N550 carbon black, 3 parts of tetraisopropoxy titanium, and 1 part of EDCI were mixed in an open mill for 20 minutes until uniform, and the temperature was controlled at 40±5°C during the mixing process. The obtained mixed rubber was placed at room temperature for 10 hours, and then vulcanized using a flat vulcanizer at a vulcanization temperature of 145°C and a vulcanization time of 30 minutes to obtain a vulcanized stator rubber material, the properties of which are shown in Table 4.

[0060] Example 8

[0061] Preparation of graphite phase carbon nitride nanosheets: Same as Example 1.

[0062] Preparation of vulcanized stator rubber material: 100 parts of carboxylated nitrile rubber, 4.5 parts of graphite phase carbon nitride nanosheets, 5.5 parts of zinc oxide, 1 part of stearic acid, 3 parts of vulcanization accelerator TMTD, 2 parts of antioxidant MB, 65 parts of N660 carbon black, 4 parts of tetraisopropoxy titanium, and 4.5 parts of EDCI

[0063] The mixture was mixed in an open mill for 20 minutes until uniform, and the temperature was controlled at 40±5°C during the mixing process. The obtained mixed rubber was placed at room temperature for 9 hours, and then vulcanized using a flat vulcanizer at a vulcanization temperature of 160°C and a vulcanization time of 40 minutes to obtain a vulcanized stator rubber material, the properties of which are shown in Table 4.

[0064] Example 9

[0065] Preparation of graphite phase carbon nitride nanosheets: Same as Example 1.

[0066] Preparation of vulcanized stator rubber material: 100 parts of carboxylated nitrile rubber, 4 parts of graphite phase carbon nitride nanosheets, 5 parts of zinc oxide, 2.5 parts of stearic acid, 3 parts of vulcanization accelerator TBBS, 2.5 parts of antioxidant MB, 60 parts of N660 carbon black, 3 parts of ZnCl2, and 3 parts of DCC were mixed in an open mill for 20 minutes until uniform, and the temperature was controlled at 40±5°C during the mixing process. The obtained mixed rubber was placed at room temperature for 12 hours, and then vulcanized using a flat vulcanizer at a vulcanization temperature of 170°C and a vulcanization time of 20 minutes to obtain a vulcanized stator rubber material, the properties of which are shown in Table 4.

[0067] Example 10

[0068] Preparation of graphite phase carbon nitride nanosheets: Same as Example 1.

[0069] Preparation of vulcanized stator rubber material: 100 parts of carboxylated nitrile rubber, 3 parts of graphite phase carbon nitride nanosheets, 3.5 parts of zinc oxide, 1.5 parts of stearic acid, 3.5 parts of vulcanization accelerator CZ, 1.5 parts of antioxidant 2246, 40 parts of N550 carbon black, 5 parts of W(SO4)3, and 3.5 parts of DIC were mixed in an open mill for 20 minutes until uniform, and the temperature was controlled at 40±5°C during the mixing process. The obtained mixed rubber was placed at room temperature for 16 hours, and then vulcanized using a flat vulcanizer at a vulcanization temperature of 150°C and a vulcanization time of 40 minutes to obtain a vulcanized stator rubber material, the properties of which are shown in Table 4.

[0070] Embodiment 11

[0071] Preparation of graphite phase carbon nitride nanosheets: Same as Example 1.

[0072] Preparation of vulcanized stator rubber material: 100 parts of carboxylated nitrile rubber, 4.5 parts of graphite phase carbon nitride nanosheets, 4.5 parts of zinc oxide, 3 parts of stearic acid, 2.5 parts of vulcanization accelerator CZ, 2 parts of antioxidant RD, 55 parts of N330 carbon black, 4.5 parts of ZnCl2, and 4.5 parts of DCC were mixed in an open mill for 20 minutes until uniform, and the temperature was controlled at 40±5°C during the mixing process. The obtained mixed rubber was placed at room temperature for 14 hours, and then vulcanized using a flat vulcanizer at a vulcanization temperature of 165°C and a vulcanization time of 20 minutes to obtain a vulcanized stator rubber material, the properties of which are shown in Table 4.

[0073] Example 12

[0074] Preparation of graphite phase carbon nitride nanosheets: Same as Example 1.

[0075] Preparation of vulcanized stator rubber material: 100 parts of carboxylated nitrile rubber, 3 parts of graphite phase carbon nitride nanosheets, 3 parts of zinc oxide, 2 parts of stearic acid, 3.5 parts of vulcanization accelerator TMTD, 2 parts of antioxidant MB, 65 parts of N330 carbon black, 2.5 parts of 2-furan boric acid, and 4 parts of EDC were mixed in an open mill for 20 minutes until uniform, and the temperature was controlled at 40±5°C during the mixing process. The obtained mixed rubber was placed at room temperature for 10 hours, and then vulcanized using a flat vulcanizer at a vulcanization temperature of 160°C and a vulcanization time of 30 minutes to obtain a vulcanized stator rubber material, the properties of which are shown in Table 4.

[0076] Example 13

[0077] Preparation of graphite phase carbon nitride nanosheets: Same as Example 1.

[0078] Preparation of vulcanized stator rubber material: 100 parts of carboxylated nitrile rubber, 5 parts of graphite phase carbon nitride nanosheets, 3.5 parts of zinc oxide, 1.5 parts of stearic acid, 3 parts of vulcanization accelerator TBBS, 2.5 parts of antioxidant 2246, 65 parts of N660 carbon black, 3.5 parts of 2-furan boric acid, and 2.5 parts of EDC were mixed in an open mill for 20 minutes until uniform, and the temperature was controlled at 40±5°C during the mixing process. The obtained mixed rubber was placed at room temperature for 15 hours, and then vulcanized using a flat vulcanizer at a vulcanization temperature of 155°C and a vulcanization time of 45 minutes to obtain a vulcanized stator rubber material, the properties of which are shown in Table 4.

[0079] Comparative Example 1

[0080] This comparative example is a comparative example of Example 4.

[0081] Preparation of vulcanized stator rubber material: 100 parts of carboxylated nitrile rubber, 5.5 parts of graphene, 5.5 parts of zinc oxide, 1.5 parts of stearic acid, 3 parts of vulcanization accelerator TBBS, 2 parts of antioxidant RD, and 60 parts of N550 carbon black were mixed in an open mill for 20 minutes until uniform, and the temperature was controlled at 40±5°C during the mixing process. The obtained mixed rubber was placed at room temperature for 12 hours, and then vulcanized using a flat vulcanizer at a vulcanization temperature of 155°C and a vulcanization time of 25 minutes to obtain a vulcanized stator rubber material, the properties of which are shown in Table 4.

[0082] Comparative Example 2

[0083] This comparative example is a comparative example of Example 6.

[0084] Preparation of vulcanized stator rubber material: 100 parts of carboxylated nitrile rubber, 5 parts of graphene, 3 parts of zinc oxide, 1.5 parts of stearic acid, 2 parts of vulcanization accelerator CZ, 2 parts of antioxidant 2246, and 65 parts of N330 carbon black were mixed in an open mill for 20 minutes until uniform, and the temperature was controlled at 40±5°C during the mixing process. The obtained mixed rubber was placed at room temperature for 14 hours, and then vulcanized using a flat vulcanizer at a vulcanization temperature of 160°C and a vulcanization time of 20 minutes to obtain a vulcanized stator rubber material, the properties of which are shown in Table 4.

[0085] Comparative Example 3

[0086] This comparative example is a comparative example of Example 6.

[0087] Preparation of graphite phase carbon nitride nanosheets: Same as Example 1.

[0088] Preparation of vulcanized stator rubber material: 100 parts of carboxylated nitrile rubber, 5 parts of graphite phase carbon nitride nanosheets, 3 parts of zinc oxide, 1.5 parts of stearic acid, 2 parts of vulcanization accelerator CZ, 2 parts of antioxidant 2246, and 65 parts of N330 carbon black were mixed in an open mill for 20 minutes until uniform, and the temperature was controlled at 40±5°C during the mixing process. The obtained mixed rubber was placed at room temperature for 14 hours, and then vulcanized using a flat vulcanizer at a vulcanization temperature of 160°C and a vulcanization time of 20 minutes to obtain a vulcanized stator rubber material, the properties of which are shown in Table 4.

[0089] The vulcanized stator rubber materials prepared in Examples 1-13 and Comparative Examples 1-3 were tested for performance, and the results are shown in Table 4 below.

[0090] Table 4 Properties of the vulcanized stator rubber materials obtained in Examples 1-8 and Comparative Examples 1-3

[0091]

[0092] It can be seen from the data in Table 4 that, when the raw materials and their weight proportions for preparing the vulcanized stator rubber material are the same, the graphite phase carbon nitride nanosheets are used in the embodiment of the present invention. Compared with the comparative example using graphene, the vulcanized stator rubber material provided by the present invention has better tensile strength, tear strength and wear resistance, and its dynamic friction coefficient is lower; at the same time, under the same conditions, the embodiment of the present invention uses an amidation accelerator to undergo an amidation reaction with the graphite phase carbon nitride nanosheets, while the comparative example not using the amidation accelerator has a lower comprehensive performance than the comprehensive performance of the vulcanized stator rubber material provided by the present invention.

[0093] Although the specific embodiments of the present invention have been described in detail, it will be understood by those skilled in the art. According to all the teachings disclosed, various modifications and replacements can be made to those details, and these changes are all within the protection scope of the present invention. The full scope of the present invention is given by the attached claims and any equivalents thereof.

Claims

1. Vulcanized stator rubber material, characterized in that: The vulcanized stator rubber material is mainly prepared from the following raw materials in parts by weight: 100 parts of carboxylated nitrile rubber; 1-6 parts of graphite phase carbon nitride nanosheets; 1-6 parts of amidation accelerator; 1-5 parts of amidation dehydrating agent.

2. The vulcanized stator rubber material according to claim 1, characterized in that: The number of layers of the graphite phase carbon nitride nanosheets is 1-5.

3. The vulcanized stator rubber material according to claim 1, characterized in that: The graphite phase carbon nitride nanosheets are prepared by the following method: The blocky graphite carbon nitride, ammonium chloride and water are stirred and mixed evenly, poured into a reaction kettle and reacted at 150-200°C. After the reaction is completed, they are calcined at 300-400°C in a N2 atmosphere to obtain graphite carbon nitride nanosheets.

4. The vulcanized stator rubber material according to claim 1, characterized in that: The amidation accelerator is ZnCl2, W(SO4)3, tetraisopropoxytitanium or 2-furanboric acid.

5. The vulcanized stator rubber material according to claim 4, characterized in that: The amidation accelerator is tetraisopropoxytitanium.

6. The vulcanized stator rubber material according to claim 1, characterized in that: The amidation dehydrating agent is N,N'-dicyclohexylcarbodiimide, N,N'-diisopropylcarbodiimide, 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride or carbodiimide.

7. The vulcanized stator rubber material according to claim 6, characterized in that: The amidation dehydrating agent is carbodiimide.

8. The vulcanized stator rubber material according to claim 1, characterized in that: The vulcanized stator rubber material also includes the following raw materials in parts by weight: 3-6 parts of zinc oxide; 1-3 parts of stearic acid; 2-5 parts of vulcanization accelerator; Anti-aging agent 0.5-3 parts; 1-2 parts of sulfur; Carbon black 40-80 parts.

9. The vulcanized stator rubber material according to claim 1, characterized in that: The weight proportion of the graphite phase carbon nitride nanosheets is 2.5-5.5 parts.

10. The vulcanized stator rubber material according to claim 1, characterized in that: The weight proportion of the amidation accelerator is 2.5-5.5 parts.

11. The vulcanized stator rubber material according to claim 1, characterized in that: The weight proportion of the amidation dehydrating agent is 2.5-4.5 parts.

12. The vulcanized stator rubber material according to claim 8, characterized in that: The weight proportion of the vulcanization accelerator is 2-4 parts.

13. The vulcanized stator rubber material according to claim 8, characterized in that: The weight proportion of the antioxidant is 2-3 parts.

14. The vulcanized stator rubber material according to claim 8, characterized in that: The weight proportion of the carbon black is 55-70 parts.

15. A method for preparing the vulcanized stator rubber material according to any one of claims 1 to 14, characterized in that: The method comprises: The raw materials are fully mixed in an open mill according to their weight proportions. The mixing temperature is controlled at 45±5°C. The mixture is mixed until uniform and placed at room temperature for 8-16 hours. Finally, the mixed rubber is vulcanized using a flat vulcanizer at a vulcanization temperature of 130-170°C and a vulcanization time of 15-45 minutes.

16. The method according to claim 15, characterized in that The vulcanization temperature is 145-165° C., and the vulcanization time is 20-40 minutes.

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