Anti-aging rubber sealing ring for power grid oil filling equipment and preparation method thereof

Abstract

The application discloses an anti-aging rubber sealing ring for power grid oil filling equipment and a preparation method thereof. The rubber sealing ring comprises, from inside to outside, an inner wear-resistant layer, an inner sealing layer, a reinforcing layer, an outer sealing layer, an anti-aging layer and an outer wear-resistant layer. The inner sealing layer and the outer sealing layer are both basic anti-aging rubber, which comprises the following raw materials: styrene-butadiene rubber, acrylate rubber, chloroprene rubber, a composite anti-aging agent, nano titanium dioxide, diatomite powder, a plasticizer, a vulcanizing agent and an accelerator. The inner wear-resistant layer and the outer wear-resistant layer are both composed of the basic anti-aging rubber and a toughening filler. The reinforcing layer is composed of the basic anti-aging rubber and a reinforcing filler. The anti-aging layer is composed of the basic anti-aging rubber and N-acetyl-L-cysteine. Various mixed rubbers are prepared first, then multi-layer co-extrusion is carried out, and post-processing is performed. The anti-aging performance of the rubber sealing ring is significantly improved, and the occurrence of sealing failures caused by the quality of the sealing ring is effectively avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sealing rings, in particular to an anti-aging rubber sealing ring for oil-filled equipment of a power grid and a preparation method thereof. BACKGROUND

[0002] There are many electrical equipment using oil-filled medium in the power system, such as main transformers, oil circuit breakers, operating mechanisms, shunt reactors, current transformers, voltage transformers, arc suppression coils and high-voltage capacitors, etc. They play a core role in power generation, power transformation and power supply systems, and it is of great significance to ensure the safe and stable operation of the power grid to do a good job in the analysis and processing of abnormal conditions of the operation monitoring of the electrical equipment. The oil-filled medium electrical equipment has very strict requirements for oil level, and when the oil level is abnormal, it needs to be handled in time.

[0003] In the prior art, oil level abnormalities caused by sealing failures are very common, and the most common one is sealing failure caused by the quality of the sealing ring, especially the failure caused by the aging of the sealing ring. Therefore, the anti-aging research of the sealing ring has always been the research focus in the technical field of sealing rings. The O-shaped rubber sealing ring with a circular cross section is most commonly used, and it is easy to age after long-term use, resulting in stickiness, cracking and hardening. The aging of the rubber sealing ring is caused by both the raw materials and the structure. Therefore, in order to effectively solve the aging problem, it is necessary to improve both the raw materials and the structure, and the existing technology often focuses on one aspect, and the improvement effect is limited. Therefore, the present application is proposed. SUMMARY

[0004] To solve the above problems in the prior art, the present application provides an anti-aging rubber sealing ring for oil-filled equipment of a power grid and a preparation method thereof.

[0005] To achieve the purpose of the present application, the technical solutions provided by the present application are as follows:

[0006] The present application provides an anti-aging rubber sealing ring for oil-filled equipment of a power grid, which comprises, from inside to outside, an inner wear-resistant layer, an inner sealing layer, a reinforcing layer, an outer sealing layer, an anti-aging layer and an outer wear-resistant layer.

[0007] The inner sealing layer and the outer sealing layer are made of the same material, which is basic anti-aging rubber. The basic anti-aging rubber comprises the following raw materials in parts by weight: 20-30 parts of styrene-butadiene rubber, 20-25 parts of acrylate rubber, 15-20 parts of chlorobutyl rubber, 4-5 parts of composite anti-aging agent, 5-8 parts of nano titanium dioxide, 4-7 parts of diatomite powder, 4-6 parts of plasticizer, 4-7 parts of vulcanizing agent and 2-3 parts of accelerator. The composite anti-aging agent is obtained by mixing anti-aging agent 4010NA, anti-aging agent 350, anti-aging agent BLE and anti-aging agent RD in a mass ratio of 1:1:1:2.

[0008] The inner wear-resistant layer and the outer wear-resistant layer are made of the same material, which is composed of basic anti-aging rubber and 10%-15% toughening filler by volume percentage, and the toughening filler is composed of polyvinyl alcohol fiber, quartz fiber and steel fiber in a volume ratio of (1-5):(1-5):1, the three kinds of fibers are combined according to the above-mentioned ratio, mainly play the role of strengthening and toughening, so as to effectively improve the wear resistance of the inner wear-resistant layer and the outer wear-resistant layer, avoid the cracks of the rubber sealing ring due to wear, and affect the sealing effect.

[0009] The reinforcing layer is composed of basic anti-aging rubber and 5%-8% reinforcing filler by weight percentage, and the reinforcing filler is composed of nano-silicon dioxide and carbon black in a weight ratio of (1-4):1, the addition of nano-silicon dioxide and carbon black helps to enhance the pressure resistance and anti-aging corrosion performance of the basic anti-aging rubber, prolonging the service life of the sealing ring.

[0010] The anti-aging layer is composed of basic anti-aging rubber and 3%-5% N-acetyl-L-cysteine by weight percentage.

[0011] The present application is composed of six layers of inner wear-resistant layer, inner sealing layer, reinforcing layer, outer sealing layer, anti-aging layer and outer wear-resistant layer, each layer has anti-aging function, and the inner and outer layers in direct contact with the parts and the outside are respectively provided with inner wear-resistant layer and outer wear-resistant layer, which can avoid the damage of the rubber sealing ring caused by external friction and sealing failure; the inner and outer sealing layers are provided, and the double-layer sealing helps to significantly improve the sealing effect; the reinforcing layer is arranged between the inner and outer sealing layers, which can improve the pressure resistance of the sealing ring; the outer wear-resistant layer is adjacent to the anti-aging layer with stronger anti-aging effect, which further ensures the anti-aging effect and effectively prevents the occurrence of leakage due to aging. The raw materials and structure are improved together, the six functional layers interact and synergize, effectively solving the aging problem of the rubber sealing ring.

[0012] It should be noted that the thickness of each layer can be flexibly controlled according to specific needs, and the present application does not make any requirements.

[0013] Preferably, the single fiber length of various fibers in the toughening filler is 5-10mm, the single fiber diameter is 50-80μm, and the tensile strength is 700-1000MPa, too long fiber is easy to clump and difficult to disperse, too short fiber has unsatisfactory strengthening and toughening effect, the fiber in the above-mentioned length, diameter and tensile strength range is a relatively optimal choice, which can play a good strengthening and toughening effect.

[0014] Further preferably, the plasticizer is any one of low molecular weight polyisobutylene and low molecular weight polybutadiene.

[0015] More preferably, the vulcanizing agent is N,N'-m-phenylene bismaleimide, 1,4-dihydroxyanthraquinone, 1,1-cyclohexyl diethyl acid monoamide, and the weight ratio is 2:1:1. The addition of the vulcanizing agent can improve the high temperature resistance of the rubber sealing ring, promote crosslinking, increase the viscosity between rubbers, reduce the aging speed, and prolong the service life.

[0016] Most preferably, the accelerator is 2-mercaptobenzothiazole.

[0017] The application also provides a preparation method of the anti-aging rubber sealing ring for power grid oil filling equipment, which is used for preparing the anti-aging rubber sealing ring for power grid oil filling equipment and comprises the following operation steps:

[0018] Step one: preparing various mixed rubbers respectively

[0019] First, the weights of the raw materials of the base anti-aging rubber are determined, then the styrene butadiene rubber, the acrylic ester rubber, the chloroprene rubber, and the plasticizer are added to the internal mixer for plasticizing at 100-110°C, and the plasticizing time is not less than 30 min; then the nano titanium dioxide and the diatomite are added for further mixing at 110-120°C for 15-20 min; finally, the composite anti-aging agent, the vulcanizing agent, and the accelerator are added for further mixing for 30 s-1 min, so as to obtain the mixed rubber of the base anti-aging rubber for preparing the inner sealing layer and the outer sealing layer;

[0020] First, the weights of the raw materials of the base anti-aging rubber are determined, then the weights of the toughening fillers are determined, then the styrene butadiene rubber, the acrylic ester rubber, the chloroprene rubber, and the plasticizer are added to the internal mixer for plasticizing at 100-110°C, and the plasticizing time is not less than 30 min; then the nano titanium dioxide, the diatomite, and the toughening fillers are added for further mixing at 110-120°C for 15-20 min; finally, the composite anti-aging agent, the vulcanizing agent, and the accelerator are added for further mixing for 30 s-1 min, so as to obtain the mixed rubber for preparing the inner wear-resistant layer and the outer wear-resistant layer;

[0021] First, the weights of the raw materials of the base anti-aging rubber are determined, then the weights of the reinforcing fillers are determined, then the styrene butadiene rubber, the acrylic ester rubber, the chloroprene rubber, and the plasticizer are added to the internal mixer for plasticizing at 100-110°C, and the plasticizing time is not less than 30 min; then the nano titanium dioxide, the diatomite, and the reinforcing fillers are added for further mixing at 110-120°C for 15-20 min; finally, the composite anti-aging agent, the vulcanizing agent, and the accelerator are added for further mixing for 30 s-1 min, so as to obtain the mixed rubber for preparing the reinforcing layer;

[0022] First, weigh out each raw material of the base anti-aging rubber according to the weight proportions, then weigh out N-acetyl-L-cysteine. Next, add styrene-butadiene rubber, acrylic rubber, chloroprene rubber, and plasticizer into a mixer and plasticize at 100-110℃ for no less than 30 minutes. Then, add nano titanium dioxide and diatomaceous earth and continue mixing at 110-120℃ for 15-20 minutes. Finally, add the composite anti-aging agent, N-acetyl-L-cysteine, vulcanizing agent, and accelerator and mix for 30 seconds to 1 minute to obtain the compound rubber used to prepare the anti-aging layer.

[0023] Step 2: Prepare rubber sealing rings by multi-layer co-extrusion of various rubber compounds;

[0024] Step 3: Trimming, finishing, quality inspection, and packaging.

[0025] Compared with the prior art, the present invention simultaneously improves the structure and raw materials of the rubber sealing ring, significantly improving its anti-aging performance and effectively avoiding sealing failures caused by the quality of the sealing ring. The final rubber sealing ring has good anti-aging, high temperature resistance, wear resistance and strong mechanical properties. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of an anti-aging rubber sealing ring for an oil-filled power grid device provided in an embodiment of this application.

[0027] In the diagram, 1 is the inner wear-resistant layer; 2 is the inner sealing layer; 3 is the reinforcing layer; 4 is the outer sealing layer; 5 is the anti-aging layer; and 6 is the outer wear-resistant layer. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0029] Example 1

[0030] like Figure 1 As shown, the anti-aging rubber sealing ring for an oil-filled power grid device provided in this embodiment includes, in sequence from the inside to the outside: an inner wear-resistant layer 1, an inner sealing layer 2, a reinforcing layer 3, an outer sealing layer 4, an anti-aging layer 5, and an outer wear-resistant layer 6.

[0031] The inner sealing layer 2 and the outer sealing layer 4 are made of the same material, both being basic anti-aging rubber. The basic anti-aging rubber includes the following raw materials in parts by weight: 30 parts styrene-butadiene rubber, 22 parts acrylic rubber, 15 parts chloroprene rubber, 5 parts composite anti-aging agent, 7 parts nano titanium dioxide, 4 parts diatomaceous earth powder, 6 parts plasticizer, 6 parts vulcanizing agent, and 2 parts accelerator. The composite anti-aging agent is composed of antioxidant 4010NA, antioxidant 350, antioxidant BLE, and antioxidant RD mixed in a mass ratio of 1:1:1:2. The plasticizer is low molecular weight polyisobutylene. The vulcanizing agent is composed of N,N'-m-phenylenebismaleimide, 1,4-dihydroxyanthraquinone, and 1,1-cyclohexyldiacetic acid monoamide in a weight ratio of 2:1:1. The accelerator is 2-mercaptobenzothiazole.

[0032] The inner wear-resistant layer 1 and the outer wear-resistant layer 6 are made of the same material, both consisting of a base anti-aging rubber and 15% toughening filler by volume. The toughening filler is composed of polyvinyl alcohol fiber, quartz fiber and steel fiber in a volume ratio of 3:1:1. The single fiber length of each fiber in the toughening filler is 5-10mm, the single fiber diameter is 50-80μm, and the tensile strength is 700-1000MPa.

[0033] The reinforcing layer 3 consists of a base anti-aging rubber and 8% by weight of reinforcing filler, which is composed of nano-silica and carbon black in a weight ratio of 3:1.

[0034] The anti-aging layer 5 consists of a base anti-aging rubber and 3% by weight of N-acetyl-L-cysteine.

[0035] The preparation method of the anti-aging rubber sealing ring for the above-mentioned oil-filled power grid equipment includes the following steps:

[0036] Step 1: Prepare various rubber compounds separately:

[0037] First, weigh each raw material of the basic anti-aging rubber according to the weight proportions. Then, add styrene-butadiene rubber, acrylic rubber, chloroprene rubber, and plasticizer into a mixer and plasticize at 110°C for no less than 30 minutes. After that, add nano titanium dioxide and diatomaceous earth and continue mixing at 115°C for 15 minutes. Finally, add composite anti-aging agent, vulcanizing agent, and accelerator and mix for another 1 minute to obtain the compound of the basic anti-aging rubber used to prepare the inner sealing layer 2 and the outer sealing layer 4.

[0038] The weight parts of each raw material of the base anti-aging rubber are weighed first, then the toughening filler is weighed, then the styrene-butadiene rubber, the acrylate rubber, the chloroprene rubber, and the plasticizer are added into the internal mixer for plasticizing at 105℃, and the plasticizing time is not less than 30 minutes; then the nano-titanium dioxide, the diatomite, and the toughening filler are continuously mixed at 110℃ for 20 minutes; finally, the composite anti-aging agent, the vulcanizing agent, and the accelerator are mixed for 45 seconds to obtain the rubber compound for preparing the inner wear-resistant layer 1 and the outer wear-resistant layer 6;

[0039] The weight parts of each raw material of the base anti-aging rubber are weighed first, then the reinforcing filler is weighed, then the styrene-butadiene rubber, the acrylate rubber, the chloroprene rubber, and the plasticizer are added into the internal mixer for plasticizing at 100℃, and the plasticizing time is not less than 30 minutes; then the nano-titanium dioxide, the diatomite, and the reinforcing filler are continuously mixed at 120℃ for 18 minutes; finally, the composite anti-aging agent, the vulcanizing agent, and the accelerator are mixed for 30 minutes to obtain the rubber compound for preparing the reinforcing layer 3;

[0040] The weight parts of each raw material of the base anti-aging rubber are weighed first, then the N-acetyl-L-cysteine is weighed, then the styrene-butadiene rubber, the acrylate rubber, the chloroprene rubber, and the plasticizer are added into the internal mixer for plasticizing at 110℃, and the plasticizing time is not less than 30 minutes; then the nano-titanium dioxide and the diatomite are continuously mixed at 115℃ for 15 minutes; finally, the composite anti-aging agent, the N-acetyl-L-cysteine, the vulcanizing agent, and the accelerator are mixed for 1 minute to obtain the rubber compound for preparing the anti-aging layer 5;

[0041] Step two: multi-layer co-extrusion of various rubber compounds to prepare the rubber sealing ring;

[0042] Step three: edge cutting, edge trimming, quality inspection, and packaging.

[0043] Example 2

[0044] The example provides an anti-aging rubber sealing ring for power grid oil charging equipment, which comprises, from inside to outside, an inner wear-resistant layer 1, an inner sealing layer 2, a reinforcing layer 3, an outer sealing layer 4, an anti-aging layer 5, and an outer wear-resistant layer 6.

[0045] The inner sealing layer 2 and the outer sealing layer 4 are made of the same material, which is the basic anti-aging rubber, and the basic anti-aging rubber comprises the following raw materials in parts by weight: 20 parts of styrene-butadiene rubber, 25 parts of acrylate rubber, 18 parts of chlorobutyl rubber, 4 parts of a composite anti-aging agent, 8 parts of nano-titanium dioxide, 5 parts of diatomite powder, 4 parts of a plasticizer, 7 parts of a vulcanizing agent, and 2.5 parts of an accelerator; the composite anti-aging agent is composed of antioxidant 4010NA, antioxidant 350, antioxidant BLE, and antioxidant RD in a mass ratio of 1:1:1:2; the plasticizer is low-molecular-weight polybutadiene; the vulcanizing agent is composed of N,N'-m-phenylene bismaleimide, 1,4-dihydroxyanthraquinone, and 1,1-cyclohexyl diacetate monoamide in a weight ratio of 2:1:1; and the accelerator is 2-mercaptobenzothiazole;

[0046] The inner wear-resistant layer 1 and the outer wear-resistant layer 6 are made of the same material, which is the basic anti-aging rubber and 10% of toughening fillers by volume percentage; the toughening fillers are composed of polyvinyl alcohol fibers, quartz fibers, and steel fibers in a volume ratio of 5:3:1; the single fibers of the various fibers in the toughening fillers have a length of 5-10 mm and a diameter of 50-80 μm, and the tensile strength is 700-1000 MPa;

[0047] The reinforcing layer 3 is composed of the basic anti-aging rubber and 5% of reinforcing fillers by weight percentage; the reinforcing fillers are composed of nano-silicon dioxide and carbon black in a weight ratio of 4:1;

[0048] The anti-aging layer 5 is composed of the basic anti-aging rubber and 4% of N-acetyl-L-cysteine by weight percentage.

[0049] The preparation method of the anti-aging rubber sealing ring for the power grid oil charging equipment comprises the following operation steps:

[0050] Step one: prepare various mixed rubbers respectively:

[0051] First, the raw materials of the basic anti-aging rubber are weighed, and then the styrene-butadiene rubber, the acrylate rubber, the chlorobutyl rubber, and the plasticizer are added to a plasticator at 100°C for plasticizing, and the plasticizing time is not less than 30 min; then the nano-titanium dioxide and the diatomite are continuously mixed at 120°C for 18 min; finally, the composite anti-aging agent, the vulcanizing agent, and the accelerator are added and mixed for 30 s, to obtain the mixed rubber of the basic anti-aging rubber for preparing the inner sealing layer 2 and the outer sealing layer 4;

[0052] The base anti-aging rubber is prepared by mixing the raw materials in the following steps: first, the raw materials are weighed according to the weight ratio, then the toughening filler is weighed, then the styrene-butadiene rubber, the acrylate rubber, the chloroprene rubber, and the plasticizer are added to the internal mixer for plasticizing at 110°C, and the plasticizing time is not less than 30 minutes; then the nano-titanium dioxide, the diatomite, and the toughening filler are added for further mixing at 115°C for 15 minutes; finally, the composite anti-aging agent, the vulcanizing agent, and the accelerator are added for further mixing for 1 minute, thereby obtaining the rubber mixture for preparing the inner wear-resistant layer 1 and the outer wear-resistant layer 6.

[0053] The base anti-aging rubber is prepared by mixing the raw materials in the following steps: first, the raw materials are weighed according to the weight ratio, then the reinforcing filler is weighed, then the styrene-butadiene rubber, the acrylate rubber, the chloroprene rubber, and the plasticizer are added to the internal mixer for plasticizing at 100°C, and the plasticizing time is not less than 30 minutes; then the nano-titanium dioxide, the diatomite, and the reinforcing filler are added for further mixing at 120°C for 18 minutes; finally, the composite anti-aging agent, the vulcanizing agent, and the accelerator are added for further mixing for 30 seconds, thereby obtaining the rubber mixture for preparing the reinforcing layer 3.

[0054] The base anti-aging rubber is prepared by mixing the raw materials in the following steps: first, the raw materials are weighed according to the weight ratio, then the N-acetyl-L-cysteine is weighed, then the styrene-butadiene rubber, the acrylate rubber, the chloroprene rubber, and the plasticizer are added to the internal mixer for plasticizing at 110°C, and the plasticizing time is not less than 30 minutes; then the nano-titanium dioxide and the diatomite are added for further mixing at 115°C for 15 minutes; finally, the composite anti-aging agent, the N-acetyl-L-cysteine, the vulcanizing agent, and the accelerator are added for further mixing for 1 minute, thereby obtaining the rubber mixture for preparing the anti-aging layer 5.

[0055] Step two: the rubber sealing ring is prepared by multi-layer co-extrusion of the rubber mixtures.

[0056] Step three: edge cutting, edge trimming, quality inspection, and packaging.

[0057] Example 3

[0058] The anti-aging rubber sealing ring for power grid oil charging equipment provided in the embodiment includes, from inside to outside, an inner wear-resistant layer 1, an inner sealing layer 2, a reinforcing layer 3, an outer sealing layer 4, an anti-aging layer 5, and an outer wear-resistant layer 6.

[0059] The inner sealing layer 2 and the outer sealing layer 4 are made of the same material, which is the basic anti-aging rubber, and the basic anti-aging rubber comprises the following raw materials in parts by weight: 25 parts of styrene-butadiene rubber, 20 parts of acrylate rubber, 20 parts of chlorobutyl rubber, 4.5 parts of a composite anti-aging agent, 5 parts of nano-titanium dioxide, 7 parts of diatomite powder, 5 parts of a plasticizer, 4 parts of a vulcanizing agent, and 3 parts of an accelerator; the composite anti-aging agent is composed of antioxidant 4010NA, antioxidant 350, antioxidant BLE, and antioxidant RD in a mass ratio of 1:1:1:2; the plasticizer is low-molecular-weight polyisobutylene; the vulcanizing agent is composed of N,N'-m-phenylene bismaleimide, 1,4-dihydroxyanthraquinone, and 1,1-cyclohexyl diethyl acid monoamide in a weight ratio of 2:1:1; and the accelerator is 2-mercaptobenzothiazole;

[0060] The inner wear-resistant layer 1 and the outer wear-resistant layer 6 are made of the same material, which is the basic anti-aging rubber and 10%-15% of toughening fillers by volume percentage; the toughening fillers are composed of polyvinyl alcohol fibers, quartz fibers, and steel fibers in a volume ratio of 3:1:1; the single fibers of the various fibers in the toughening fillers have a length of 5-10 mm and a diameter of 50-80 μm, and the tensile strength is 700-1000 MPa;

[0061] The reinforcing layer 3 is composed of the basic anti-aging rubber and 8% of reinforcing fillers by weight percentage; the reinforcing fillers are composed of nano-silicon dioxide and carbon black in a weight ratio of 3:1;

[0062] The anti-aging layer 5 is composed of the basic anti-aging rubber and 3% of N-acetyl-L-cysteine by weight percentage.

[0063] The preparation method of the anti-aging rubber sealing ring for the power grid oil-filled equipment described above comprises the following operation steps:

[0064] Step one: prepare various mixed rubbers respectively:

[0065] First, the raw materials of the basic anti-aging rubber are weighed, and then the styrene-butadiene rubber, the acrylate rubber, the chlorobutyl rubber, and the plasticizer are added to a plasticator at 110°C for plasticizing, and the plasticizing time is not less than 30 min; then the nano-titanium dioxide and the diatomite are continuously mixed at 115°C for 15 min; finally, the composite anti-aging agent, the vulcanizing agent, and the accelerator are added and mixed for 1 min, to obtain the mixed rubber of the basic anti-aging rubber for preparing the inner sealing layer 2 and the outer sealing layer 4;

[0066] The weight parts of each raw material of the base anti-aging rubber are weighed first, then the toughening filler is weighed, then the styrene butadiene rubber, the acrylate rubber, the chloroprene rubber, and the plasticizer are added into the internal mixer for plasticizing at 105℃, and the plasticizing time is not less than 30 minutes; then the nano-titanium dioxide, the diatomite, and the toughening filler are continuously mixed at 110℃ for 20 minutes; finally, the composite anti-aging agent, the vulcanizing agent, and the accelerator are added and mixed for 50 seconds to obtain the rubber compound for preparing the inner wear-resistant layer 1 and the outer wear-resistant layer 6;

[0067] The weight parts of each raw material of the base anti-aging rubber are weighed first, then the reinforcing filler is weighed, then the styrene butadiene rubber, the acrylate rubber, the chloroprene rubber, and the plasticizer are added into the internal mixer for plasticizing at 100℃, and the plasticizing time is not less than 30 minutes; then the nano-titanium dioxide, the diatomite, and the reinforcing filler are continuously mixed at 120℃ for 18 minutes; finally, the composite anti-aging agent, the vulcanizing agent, and the accelerator are added and mixed for 30 seconds to obtain the rubber compound for preparing the reinforcing layer 3;

[0068] The weight parts of each raw material of the base anti-aging rubber are weighed first, then the N-acetyl-L-cysteine is weighed, then the styrene butadiene rubber, the acrylate rubber, the chloroprene rubber, and the plasticizer are added into the internal mixer for plasticizing at 110℃, and the plasticizing time is not less than 30 minutes; then the nano-titanium dioxide and the diatomite are continuously mixed at 115℃ for 15 minutes; finally, the composite anti-aging agent, the N-acetyl-L-cysteine, the vulcanizing agent, and the accelerator are added and mixed for 1 minute to obtain the rubber compound for preparing the anti-aging layer 5;

[0069] Step two: multi-layer co-extrusion of various rubber compounds to prepare the rubber sealing ring;

[0070] Step three: edge cutting, edge trimming, quality inspection, and packaging.

[0071] Performance test:

[0072] According to GB / T3512, the samples obtained in Examples 1-3 are made into dumbbell-shaped test pieces as specified in GB / T528, and the dumbbell-shaped test pieces are divided into two groups, one group is tested for mechanical properties according to GB / T1040-92 at a temperature of 25±1℃ and a tensile speed of 500mm / min; the other group is placed in an aging oven at 175℃, and after aging for 96h, it is cooled and tested for mechanical properties according to GB / T1040-92 at a temperature of 25±1℃ and a tensile speed of 500mm / min. The samples obtained in Examples 1-3 are made into dumbbell-shaped test pieces as specified in GB / T528, and the test pieces are preheated in an oven at 175℃ for 10-15min, and then stretched according to HGT3868-2008 at a tensile speed of 500mm / min±20mm / min until they are broken. The test results are shown in the following table.

[0073] Tensile strength / MPa (before aging) Tensile strength / MPa (after aging) Tensile strength / MPa (high temperature) Example 1 21.3 20.6 7.9 Example 2 21.6 21.2 8.5 Example 3 22.1 21.8 5.3

[0074] Obviously, the rubber sealing rings prepared by the embodiments 1-3 of the present application have excellent anti-aging, high temperature resistance and mechanical properties.

[0075] Finally, it should be noted that: the above examples are only for the examples and description of the present application, and are not intended to limit the present application to the scope of the described embodiments. In addition, those skilled in the art can understand that the present application is not limited to the above embodiments, and more variants and modifications can be made according to the teaching of the present application, which all fall within the scope of the present application.

Claims

1. An anti-aging rubber sealing ring for an oil-filled power grid device, characterized in that: It includes the following layers arranged in sequence from the inside out: inner wear-resistant layer (1), inner sealing layer (2), reinforcing layer (3), outer sealing layer (4), anti-aging layer (5), and outer wear-resistant layer (6); The inner sealing layer (2) and the outer sealing layer (4) are made of the same material, both of which are basic anti-aging rubber. The basic anti-aging rubber includes the following raw materials in parts by weight: 20-30 parts of styrene-butadiene rubber, 20-25 parts of acrylic rubber, 15-20 parts of chloroprene rubber, 4-5 parts of composite anti-aging agent, 5-8 parts of nano titanium dioxide, 4-7 parts of diatomaceous earth powder, 4-6 parts of plasticizer, 4-7 parts of vulcanizing agent, and 2-3 parts of accelerator. The composite anti-aging agent is made by mixing antioxidant 4010NA, antioxidant 350, antioxidant BLE, and antioxidant RD in a mass ratio of 1:1:1:

2. The inner wear-resistant layer (1) and the outer wear-resistant layer (6) are made of the same material, both consisting of the base anti-aging rubber and toughening fillers of 10%-15% by volume. The toughening fillers are composed of polyvinyl alcohol fiber, quartz fiber and steel fiber in a volume ratio of (1-5):(1-5):

1. The reinforcing layer (3) is composed of the base anti-aging rubber and 5%-8% by weight of reinforcing filler, wherein the reinforcing filler is composed of nano silica and carbon black in a weight ratio of (1-4):1; The anti-aging layer (5) consists of the base anti-aging rubber and 3%-5% by weight of N-acetyl-L-cysteine.

2. The anti-aging rubber sealing ring for power grid oil filling equipment according to claim 1, characterized in that: The toughening filler contains various fibers with a single fiber length of 5-10 mm, a single fiber diameter of 50-80 μm, and a tensile strength of 700-1000 MPa.

3. The anti-aging rubber sealing ring for power grid oil filling equipment according to claim 1, characterized in that: The plasticizer is either low molecular weight polyisobutylene or low molecular weight polybutadiene.

4. The anti-aging rubber sealing ring for power grid oil filling equipment according to claim 1, characterized in that: The vulcanizing agent is composed of N,N'-m-phenylenebismaleimide, 1,4-dihydroxyanthraquinone, and 1,1-cyclohexyldiacetic acid monoamide in a weight ratio of 2:1:

1.

5. The anti-aging rubber sealing ring for power grid oil filling equipment according to claim 1, characterized in that: The accelerator is 2-mercaptobenzothiazole.

6. A method for preparing an anti-aging rubber sealing ring for an oil-filled power grid device, characterized in that: The method is used to prepare an anti-aging rubber sealing ring for an oil-filled power grid device as described in any one of claims 1-5, and includes the following steps: Step 1: Prepare various rubber compounds separately: First, weigh each of the raw materials of the basic anti-aging rubber according to the weight proportions. Then, add styrene-butadiene rubber, acrylic rubber, chloroprene rubber, and plasticizer into a mixer and plasticize at 100-110°C for no less than 30 minutes. After that, add nano titanium dioxide and diatomaceous earth and continue mixing at 110-120°C for 15-20 minutes. Finally, add composite anti-aging agent, vulcanizing agent, and accelerator and mix for 30 seconds to 1 minute to obtain the compound of the basic anti-aging rubber used to prepare the inner sealing layer (2) and the outer sealing layer (4). First, weigh each raw material of the base anti-aging rubber according to the weight proportions, then weigh the toughening filler, and then add styrene-butadiene rubber, acrylic rubber, chloroprene rubber and plasticizer into a mixer and plasticize at 100-110℃ for no less than 30 minutes; then add nano titanium dioxide, diatomaceous earth and toughening filler and continue mixing at 110-120℃ for 15-20 minutes; finally add composite anti-aging agent, vulcanizing agent and accelerator and mix for 30 seconds to 1 minute to obtain the compound rubber used to prepare the inner wear-resistant layer (1) and the outer wear-resistant layer (6); First, weigh each of the raw materials of the base anti-aging rubber according to the weight parts, then weigh the reinforcing filler, and then add styrene-butadiene rubber, acrylic rubber, chloroprene rubber and plasticizer into a mixer and plasticize at 100-110℃ for no less than 30 minutes; then add nano titanium dioxide, diatomaceous earth and reinforcing filler and continue mixing at 110-120℃ for 15-20 minutes; finally add composite anti-aging agent, vulcanizing agent and accelerator and mix for 30 seconds to 1 minute to obtain the compound rubber used to prepare the reinforcing layer (3); First, weigh each of the raw materials of the basic anti-aging rubber according to the weight parts, then weigh N-acetyl-L-cysteine, then add styrene-butadiene rubber, acrylate rubber, chloroprene rubber and plasticizer into a mixer and plasticize at 100-110℃ for no less than 30min; then add nano titanium dioxide and diatomaceous earth and continue mixing at 110-120℃ for 15-20min; finally add composite anti-aging agent, N-acetyl-L-cysteine, vulcanizing agent and accelerator and mix again for 30s-1min to obtain the compound rubber used to prepare the anti-aging layer (5); Step 2: Prepare rubber sealing rings by multi-layer co-extrusion of various rubber compounds; Step 3: Trimming, finishing, quality inspection, and packaging.

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