Insulator shed

Abstract

The application provides an insulator shed sheath, which comprises an insulator shed sheath layer and an insulator shed sheath anti-aging layer wrapped outside the insulator shed sheath layer; the shed sheath layer is made of silicon rubber mixed with pressure-sensitive ceramic; the pressure-sensitive ceramic is MnO2-ZnO-SnO2-based ceramic; the molar fraction of each component of the MnO2-ZnO-SnO2-based ceramic is (0.05-1%) MnO2:(90-99.5%) ZnO:(1-10%) SnO2; the insulator shed sheath anti-aging layer comprises a crosslinking agent, a catalyst, a plasticizer, a flame retardant and a reinforcing aid. By coating an insulator shed sheath anti-aging layer outside the insulator shed sheath layer, the anti-aging performance of the insulator shed sheath is improved and the service life is prolonged through the synergistic effect between the material layers.

Description

TECHNICAL FIELD

[0001] The present application relates to an insulator shed sheath. BACKGROUND

[0002] Insulators are devices installed between conductors of different potentials or between conductors and ground potential components, capable of withstanding voltage and mechanical stress. Therefore, the insulator is a special insulation control, which plays an important role in overhead transmission lines. Due to the importance of the insulator, the insulator should have high stability, and cannot fail due to changes in environmental and load conditions, otherwise the insulator will threaten the safety of the entire line.

[0003] Therefore, in order to further improve the safety of the insulator in use, the insulator used on the power facility at the present stage is generally a composite insulator. The so-called composite insulator is structurally composed of an insulator body, a hardware accessory glued to both ends of the insulator body, and an external insulating shed sheath sleeved outside the porcelain rod insulator body and lapped with the hardware accessory. The insulating shed sheath is generally made of silicone rubber mixed with other additives.

[0004] The minimum molecular main chain of silicone rubber is Si-O, and the side chain is mostly an organic group. The entire molecular structure of silicone rubber is stable, which is a special material containing both inorganic structure and organic groups, and has a long service life. The shed sheath is formed by mixing silicone rubber material with various additives and then heating and pressurizing vulcanization pouring. The high bond energy main chain is wrapped and covered with additive molecules, so that the overall service life of the silicone rubber material is higher than that of ordinary organic materials. However, there is still a problem of easy aging in actual use. SUMMARY

[0005] In order to solve the problem of easy aging of the insulator shed sheath in the prior art, the present application provides an insulator shed sheath and a preparation process thereof, and the specific scheme is as follows:

[0006] The influencing factors of the easy aging of the insulator shed sheath include internal factors, i.e. the composition of the raw materials used for manufacturing the insulator shed sheath, the process, the types of additives and the addition ratio, and external factors including the natural environment where the shed sheath is located and the extreme environment that the shed sheath will face in the use process. On the one hand, long-term exposure to the natural environment will cause the shed sheath to harden, and on the other hand, the scene where the insulator shed sheath is used is an electric field. In the special environment of the electric field, corona discharge and local high temperature may occur. Local discharge will reduce the hydrophobicity of the silicone rubber shed sheath, and local high temperature will cause thermal decomposition of the silicone rubber. As the corona time continues, the surface structure of the silicone rubber is severely damaged, causing surface oxidation reaction, molecular chain crosslinking, discharge breakdown of air to produce strong oxidizing gas, which will cause a very obvious decrease in the mechanical properties.

[0007] Based on the above influencing factors, the technical scheme improves the insulator shed and its preparation process, specifically as follows:

[0008] An insulator shed sheath, the insulator shed sheath comprises an insulator shed sheath layer and an anti-aging layer wrapped outside the insulator shed sheath layer;

[0009] The shed sheath layer is made of silicone rubber mixed with pressure-sensitive ceramic;

[0010] The pressure-sensitive ceramic is MnO2-ZnO-SnO2-based ceramic; the molar fraction of each component of the MnO2-ZnO-SnO2-based ceramic is (0.05-1%) MnO2:(90-99.5%) ZnO:(1-10%) SnO2;

[0011] The anti-aging layer of the insulator shed sheath comprises 30-50 parts of crosslinking agent, 20-60 parts of catalyst, 30-50 parts of plasticizer, 10-20 parts of flame retardant, and 10-30 parts of reinforcing aid.

[0012] Further, the preparation method of the shed sheath layer comprises the following steps:

[0013] S1: Dissolve silicone rubber and bis-dipentasulfide with tetrahydrofuran;

[0014] S2: Mix the silicone rubber solution with MnO2-ZnO-SnO2-based ceramic and stir;

[0015] S3: Use water bath for heating during mixing;

[0016] S4: After heating, put it into an oven for drying;

[0017] S5: After drying, the raw materials are formed by a tablet press mold and then heated and vulcanized.

[0018] Further, the preparation method of the MnO2-ZnO-SnO2-based ceramic comprises the following steps:

[0019] S1: According to the molar ratio of MnO2-ZnO-SnO2, prepare the raw materials;

[0020] S2: Dilute the adhesive with deionized water, and add the adhesive to the raw materials prepared in S1;

[0021] S3: Continue to add a dispersant in S2, mix and stir, and then put it into a planetary ball mill for processing;

[0022] S4: Dry the material after S3 processing is completed, crush the dried material, and sieve;

[0023] S5: Put the sieved particles of S4 into a muffle furnace for temperature rising sintering and then decrease to room temperature to obtain the finished product.

[0024] Further, the sintering temperature in S5 is 1000-1500℃, and the sintering time is 1-5h.

[0025] Further, the cross-linking agent is a ketoxime type cross-linking agent.

[0026] Further, the catalyst is a zirconium type catalyst.

[0027] Further, the reinforcing aid is fumed white carbon black.

[0028] Further, the plasticizer is diethyl silicone oil.

[0029] Further, the flame retardant is a mixture of Al(OH)3 and Mg(OH)2.

[0030] The plasticizer plays a decisive role in the elastic strength of the anti-aging layer of the insulator shed sheath, and therefore the selection of the plasticizer needs to be matched with the cross-linking agent.

[0031] Beneficial effects:

[0032] (1) The application provides an insulator shed sheath, which comprises an insulator shed sheath layer and an insulator shed sheath anti-aging layer coated on the outside of the insulator shed sheath layer, wherein the shed sheath layer is composed of silicone rubber and MnO2-ZnO-SnO2-based ceramic, and the addition of the MnO2-ZnO-SnO2-based ceramic improves the non-polarity of the prepared shed sheath layer, thereby improving the anti-aging property and safety of the shed sheath layer in the use process of an extreme electric field.

[0033] (2) The application provides an insulator shed sheath, and the non-polarity of the shed sheath layer is further improved by optimizing the proportion of each component in the MnO2-ZnO-SnO2-based ceramic.

[0034] (3) By coating an insulator shed sheath anti-aging layer on the outside of the insulator shed sheath layer, the anti-aging property of the insulator shed sheath is improved through the synergistic effect between the material layers, thereby prolonging the service life.

[0035] (4) The insulator shed sheath anti-aging layer comprises a cross-linking agent, a catalyst, a plasticizer, a flame retardant and a reinforcing aid; the cross-linking agent is preferably a ketoxime type cross-linking agent, and the plasticizer is preferably diethyl silicone oil; the elastic strength of the finally prepared insulator shed sheath is improved through the matching of the cross-linking agent and the plasticizer. DETAILED DESCRIPTION

[0036] In order to deepen the understanding of the present application, the present application will be further described below in conjunction with examples, which are only used to explain the present application and do not constitute a limitation to the protection scope of the present application.

[0037] Example one:

[0038] A preparation method of an insulator umbrella skirt sheath comprises the following steps:

[0039] (1) Preparation of the insulator umbrella skirt sheath layer

[0040] First, MnO2-ZnO-SnO2-based ceramics are prepared, and the preparation method of the MnO2-ZnO-SnO2-based ceramics comprises the following steps:

[0041] S1: ingredients are prepared according to the molar ratio of MnO2-ZnO-SnO2, and the molar ratio of MnO2-ZnO-SnO2 is 0.05% MnO2: 95.5% ZnO: 4.45% SnO2;

[0042] S2: the adhesive is diluted with deionized water, and the adhesive is added to the raw materials prepared in S1;

[0043] S3: a dispersing agent is continuously added in S2, and after mixing and stirring, it is put into a planetary ball mill for processing;

[0044] S4: the material after the processing in S3 is dried, and the dried material is crushed and sieved;

[0045] S5: the particles sieved in S4 are put into a muffle furnace to be heated to 1300℃ for sintering for 3h and then to room temperature to obtain the finished product;

[0046] S6: the silicone rubber is dissolved with tetrahydrofuran, and the bis-dipentasulfurized agent is used;

[0047] S7: the silicone rubber solution is mixed with the MnO2-ZnO-SnO2-based ceramics and stirred;

[0048] S8: water bath is used for heating during the mixing process;

[0049] S9: after heating, it is put into an oven for drying;

[0050] S10: the dried raw material is formed by a tablet pressing mold and then heated and vulcanized to obtain the insulator umbrella skirt sheath layer.

[0051] (2) Preparation of the anti-aging layer of the insulator umbrella skirt sheath

[0052] The anti-aging layer of the insulator umbrella skirt sheath comprises 30 parts of ketoxime type cross-linking agent, 20 parts of zirconium catalyst, 30 parts of diethyl silicone oil, 10 parts of mixture of Al(OH) 3 and Mg(OH) 2, and 10 parts of fumed white carbon black.

[0053] The anti-aging layer of the insulator umbrella skirt sheath prepared in the step (2) of coating a layer on the outside of the prepared insulator umbrella skirt sheath layer is the finished product.

[0054] Example 2

[0055] A preparation method of an insulator umbrella skirt sheath comprises the following steps:

[0056] (1) Preparation of the insulator umbrella skirt sheath layer

[0057] First, MnO 2-ZnO-SnO 2-based ceramic is prepared, and the preparation method of the MnO 2-ZnO-SnO 2-based ceramic comprises the following steps:

[0058] S1: ingredients are prepared according to the molar ratio of MnO 2-ZnO-SnO 2, and the molar ratio of MnO 2-ZnO-SnO 2 is 1% MnO 2: 98% ZnO: 1% SnO 2;

[0059] S2: the binder is diluted with deionized water, and then the binder is added to the raw materials prepared in S1;

[0060] S3: a dispersing agent is continuously added in S2, and after mixing and stirring, the mixture is put into a planetary ball mill for processing;

[0061] S4: the material after the processing in S3 is dried, and then the dried material is crushed and sieved;

[0062] S5: the particles sieved in S4 are put into a muffle furnace for heating to 1300℃ for 2h, and then the temperature is lowered to room temperature to obtain the finished product;

[0063] S6: the silicone rubber is dissolved in tetrahydrofuran, and the bis-dipentyl vulcanizing agent is used;

[0064] S7: the silicone rubber solution and the MnO 2-ZnO-SnO 2-based ceramic are mixed and stirred;

[0065] S8: water bath is used for heating during the mixing process;

[0066] S9: after the heating is completed, the mixture is put into an oven for drying;

[0067] S10: the dried raw material is formed by a tablet pressing die, and then heated and vulcanized to obtain the insulator umbrella skirt sheath layer.

[0068] (2) Preparation of the anti-aging layer of the insulator umbrella skirt sheath

[0069] The anti-aging layer of the insulator umbrella skirt sheath comprises 50 parts of ketoxime type cross-linking agent, 60 parts of zirconium catalyst, 50 parts of diethyl silicone oil, 20 parts of a mixture of Al(OH)3 and Mg(OH)2, and 30 parts of fumed white carbon black.

[0070] The anti-aging layer of the insulator umbrella skirt sheath prepared in the step (2) of coating the outer part of the prepared insulator umbrella skirt sheath layer is the finished product.

[0071] Example Three:

[0072] A method for preparing an insulator umbrella skirt sheath comprises the following steps:

[0073] (1) Preparation of the insulator umbrella skirt sheath layer

[0074] First, MnO2-ZnO-SnO2-based ceramic is prepared, and the preparation method of the MnO2-ZnO-SnO2-based ceramic comprises the following steps:

[0075] S1: ingredients are prepared according to the molar ratio of MnO2-ZnO-SnO2, and the molar ratio of MnO2-ZnO-SnO2 is 0.5% MnO2: 96% ZnO: 3.5% SnO2;

[0076] S2: the binder is diluted with deionized water, and then added to the raw materials prepared in S1;

[0077] S3: a dispersing agent is continuously added in S2, and then mixed and stirred and put into a planetary ball mill for processing;

[0078] S4: the material after the processing in S3 is dried, and then crushed and sieved;

[0079] S5: the particles sieved in S4 are put into a muffle furnace for sintering at 1300℃ for 3h, and then cooled to room temperature to obtain the finished product;

[0080] S6: the silicone rubber is dissolved in tetrahydrofuran, and the bis-dipentyl vulcanizing agent is used;

[0081] S7: the silicone rubber solution and the MnO2-ZnO-SnO2-based ceramic are mixed and stirred;

[0082] S8: water bath is used for heating during the mixing process;

[0083] S9: after the heating is completed, the material is put into an oven for drying;

[0084] S10: the dried raw material is formed by a tablet pressing die, and then heated and vulcanized to obtain the insulator umbrella skirt sheath layer.

[0085] (2) Preparation of the anti-aging layer of the insulator umbrella skirt sheath

[0086] The anti-aging layer of the insulator umbrella skirt sheath comprises 45 parts of ketoxime type cross-linking agent, 50 parts of zirconium catalyst, 40 parts of diethyl silicone oil, 15 parts of mixture of Al(OH)3 and Mg(OH)2, and 20 parts of fumed white carbon black.

[0087] The anti-aging layer of the insulator umbrella skirt sheath is obtained after the outer coating of the prepared insulator umbrella skirt sheath layer is completed.

[0088] As a further improvement, the above-described embodiments are merely desirable embodiments of the present application but are not intended to limit the present application and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An insulator skirt sheath, characterized in that, The insulator skirt sheath includes an insulator skirt sheath layer and an insulator skirt sheath anti-aging layer coated on the outside of the insulator skirt sheath layer; The umbrella skirt sheath layer is made of a mixture of silicone rubber and pressure-sensitive ceramic; The pressure-sensitive ceramic is a MnO2-ZnO-SnO2-based ceramic; the molar fraction of each component of the MnO2-ZnO-SnO2-based ceramic is (0.05-1%) MnO2: (90-99.5%) ZnO: (1-10%) SnO2; The anti-aging layer of the insulator skirt sheath comprises 30-50 parts of crosslinking agent, 20-60 parts of catalyst, 30-50 parts of plasticizer, 10-20 parts of flame retardant, and 10-30 parts of reinforcing agent; The crosslinking agent is a ketoxime type crosslinking agent, the catalyst is a zirconium catalyst, the reinforcing agent is fumed silica, the plasticizer is diethyl silicone oil, and the flame retardant is a mixture of Al(OH)3 and Mg(OH)2.

2. The insulator skirt sheath according to claim 1, characterized in that, The method for preparing the umbrella skirt sheath layer includes the following steps: S1: Use tetrahydrofuran to dissolve silicone rubber and di(2,5) vulcanizing agent; S2: Mix the silicone rubber solution with the MnO2-ZnO-SnO2-based ceramic and then stir to mix the materials; S3: A water bath is used for heating during the mixing process; S4: After heating, place in an oven to dry; S5: The dried raw material is formed by pressing it into a tablet and then heated and vulcanized.

3. An insulator skirt sheath according to claim 1, characterized in that, The preparation method of the MnO2-ZnO-SnO2-based ceramic includes the following steps: S1: Prepare the ingredients according to the molar ratio of MnO2-ZnO-SnO2; S2: Dilute the adhesive with deionized water and add the adhesive to the raw materials prepared in S1; S3: Continue to add dispersant to S2, mix and stir, and then process in a planetary ball mill; S4: Dry the material after the S3 process, then crush and sieve the dried material. S5: The particles sieved from S4 are placed in a fluoropolymer furnace for heating and sintering, and then cooled to room temperature to obtain the finished product.

4. An insulator skirt sheath according to claim 3, characterized in that, The sintering temperature in S5 is 1000–1500℃, and the sintering time is 1–5 hours.

5. An insulator skirt sheath according to claim 2, characterized in that, The water bath heating temperature is 40–60°C.