CN116694086A - High-temperature-resistant high-strength torsion-resistant high-flame-retardant cable insulating sheath material and manufacturing method thereof - Google Patents
High-temperature-resistant high-strength torsion-resistant high-flame-retardant cable insulating sheath material and manufacturing method thereof Download PDFInfo
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- 239000000463 material Substances 0.000 title claims abstract description 37
- 239000003063 flame retardant Substances 0.000 title claims abstract description 23
- 238000004519 manufacturing process Methods 0.000 title abstract description 5
- 229920002379 silicone rubber Polymers 0.000 claims abstract description 80
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 61
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 40
- 239000000843 powder Substances 0.000 claims abstract description 36
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000010453 quartz Substances 0.000 claims abstract description 21
- HIHIPCDUFKZOSL-UHFFFAOYSA-N ethenyl(methyl)silicon Chemical compound C[Si]C=C HIHIPCDUFKZOSL-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000004408 titanium dioxide Substances 0.000 claims abstract description 20
- 229910021485 fumed silica Inorganic materials 0.000 claims abstract description 19
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 16
- 239000010445 mica Substances 0.000 claims abstract description 15
- 229910052618 mica group Inorganic materials 0.000 claims abstract description 15
- CFOAUMXQOCBWNJ-UHFFFAOYSA-N [B].[Si] Chemical compound [B].[Si] CFOAUMXQOCBWNJ-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910000420 cerium oxide Inorganic materials 0.000 claims abstract description 12
- BPYFPNZHLXDIGA-UHFFFAOYSA-N diphenylsilicon Chemical compound C=1C=CC=CC=1[Si]C1=CC=CC=C1 BPYFPNZHLXDIGA-UHFFFAOYSA-N 0.000 claims abstract description 12
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims abstract description 12
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 claims abstract description 12
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims abstract description 12
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 claims abstract description 12
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229920002545 silicone oil Polymers 0.000 claims abstract description 12
- 238000009413 insulation Methods 0.000 claims abstract description 11
- BKGYVGAGCKBQTL-UHFFFAOYSA-N phenoxybenzene;silicon Chemical compound [Si].C=1C=CC=CC=1OC1=CC=CC=C1 BKGYVGAGCKBQTL-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229920001971 elastomer Polymers 0.000 claims description 24
- 238000002156 mixing Methods 0.000 claims description 21
- 239000004945 silicone rubber Substances 0.000 claims description 21
- 238000004513 sizing Methods 0.000 claims description 12
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 claims description 10
- 230000032683 aging Effects 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 claims description 8
- 238000005303 weighing Methods 0.000 claims description 7
- 238000007599 discharging Methods 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- 229920002554 vinyl polymer Polymers 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 4
- 229920001296 polysiloxane Polymers 0.000 claims description 4
- -1 polysiloxane Polymers 0.000 claims description 4
- 239000000654 additive Substances 0.000 claims description 3
- 230000000996 additive effect Effects 0.000 claims description 3
- 239000000498 cooling water Substances 0.000 claims description 3
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims description 2
- 239000006229 carbon black Substances 0.000 claims description 2
- 239000002994 raw material Substances 0.000 claims description 2
- 239000003292 glue Substances 0.000 claims 1
- 230000005855 radiation Effects 0.000 abstract description 4
- 239000000126 substance Substances 0.000 abstract description 4
- 239000002253 acid Substances 0.000 abstract description 2
- 239000002904 solvent Substances 0.000 abstract description 2
- 238000003763 carbonization Methods 0.000 abstract 1
- 230000007774 longterm Effects 0.000 description 5
- 239000004020 conductor Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- XIDMEZQKWGZOGJ-UHFFFAOYSA-N [Si].C=12C(=CC=CC1)O2 Chemical compound [Si].C=12C(=CC=CC1)O2 XIDMEZQKWGZOGJ-UHFFFAOYSA-N 0.000 description 3
- 239000004709 Chlorinated polyethylene Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000010070 extrusion (rubber) Methods 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 229920001084 poly(chloroprene) Polymers 0.000 description 2
- 238000004073 vulcanization Methods 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- HQQADJVZYDDRJT-UHFFFAOYSA-N ethene;prop-1-ene Chemical group C=C.CC=C HQQADJVZYDDRJT-UHFFFAOYSA-N 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000001038 titanium pigment Substances 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/14—Extreme weather resilient electric power supply systems, e.g. strengthening power lines or underground power cables
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- Organic Insulating Materials (AREA)
Abstract
The invention discloses a high-temperature-resistant high-strength torsion-resistant high-flame-retardant cable insulating sheath material and a manufacturing method thereof, wherein the sheath material comprises the following components: boron silicon rubber, low-phenyl silicon rubber, methyl vinyl silicon rubber, phenyl ether silicon rubber, fumed silica, titanium dioxide, quartz powder, diatomite, diphenyl silicon glycol, hydroxyl silicone oil, ferric oxide, nano mica powder, cerium oxide and bis-dipentaerythritol vulcanizing agent. The cable has the advantages of high temperature resistance, high strength, torsion resistance, excellent acid resistance, chemical solvent resistance, radiation resistance and high flame retardance, and is applicable to cables in the metallurgical industry to solve the carbonization problem of the sheath in the high temperature environment, and is also applicable to cable insulation and sheath in extremely severe environments such as aviation, chemical industry, atomic energy industry and the like.
Description
Technical Field
The invention relates to a high-temperature-resistant high-strength torsion-resistant high-flame-retardant cable insulating sheath material and a manufacturing method thereof.
Background
At present, a neoprene sheath or a chlorinated polyethylene sheath is generally adopted as a dynamic cable sheath for power supply of a furnace stamping vehicle, a ladle vehicle and a slag ladle vehicle in the domestic metallurgical industry, and the working temperature of the neoprene sheath or the chlorinated polyethylene sheath is 90 ℃ according to the conventional formula. Because the cable is in the high-temperature radiation cable for a long time and the radiation temperature near the smelting furnace section reaches 300 ℃, and is frequently dragged and frequently curled and rotated, the phenomenon that the sheath is carbonized and cracked and must be replaced when the sheath is short near the high-temperature furnace after 15 days to 3 months of use can occur. The temperature resistance of the cable insulation sheath used in the current atomic energy industry is also low. Therefore, the problem of poor temperature resistance of cables in the metallurgical industry and the atomic energy industry is a problem to be solved urgently at present.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a high-temperature-resistant high-strength torsion-resistant high-flame-retardant cable insulating sheath material and a manufacturing method thereof, and the material can enable the cable to have the characteristics of high-temperature resistance, high-strength torsion resistance and high flame retardance so as to meet the requirements of cable use in metallurgical industry and atomic energy industry.
The invention relates to a high-temperature-resistant high-strength torsion-resistant high-flame-retardant cable insulating sheath material which comprises the following raw materials in parts by weight: 50-90 parts of borosilicate rubber, 5-25 parts of low-phenyl silicone rubber, 5-25 parts of methyl vinyl silicone rubber, 2-10 parts of phenyl ether silicon rubber, 30-45 parts of fumed silica, 10-20 parts of titanium dioxide, 5-20 parts of quartz powder, 5-20 parts of kieselguhr, 2-5 parts of diphenyl silicon glycol, 2-5 parts of hydroxyl silicone oil, 2-5 parts of ferric oxide, 5-10 parts of nano mica powder, 1-4 parts of cerium oxide and 0.5-2 parts of bis-penta vulcanizing agent.
The low-phenyl silicone rubber preferably has a phenyl content of 6-9%, wherein the phenyl content refers to the molar percentage of phenyl units contained in the silicone rubber molecule to the total number of all units, and is expressed as the ratio Ph (%) of the number of units containing phenyl groups to the total number of units of the polysiloxane molecule.
The methyl vinyl silicone rubber preferably has a molecular weight of 57-63 ten thousand, a vinyl content of 0.13-0.17%, and the vinyl content refers to the molar percentage of vinyl units contained in the silicone rubber molecule to the total number of all units, and is expressed by the ratio Vi (%) of the number of units containing vinyl to the total number of polysiloxane molecule units.
In order to improve the tensile strength of the insulating sheath material and the heat resistance, 40-45 parts of fumed silica, 10-15 parts of titanium dioxide, 10-20 parts of quartz powder, 10-15 parts of diatomite and 5-8 parts of nano mica powder.
The preparation method of the high-temperature-resistant high-strength torsion-resistant high-flame-retardant cable insulating sheath material comprises the following steps:
1) Weighing one half of raw rubber in the formula, putting the raw rubber into an internal mixer, wherein the raw rubber is boron silicon rubber, low-phenyl silicon rubber and methyl vinyl silicon rubber, and simultaneously putting one third of fumed silica, titanium dioxide, quartz powder and diatomite in the formula into the internal mixer, and closing the internal mixer to carry out internal mixing for 120-150 seconds;
2) And opening the internal mixer, and putting one half of raw rubber (boron silicon rubber, low-phenyl silicon rubber and methyl vinyl silicon rubber) in the formula into the internal mixer again. Simultaneously adding one third of the formula weight parts of fumed silica, titanium dioxide and quartz powder into an internal mixer, and carrying out internal mixing for 120-150 seconds;
3) Adding one third of the weight parts of the fumed silica, titanium dioxide and quartz powder into the formula again, adding diatomite into an internal mixer, and carrying out internal mixing for 120-150 seconds at 70+/-2 ℃;
4) Adding the diphenyl silicon glycol of which the weight part is equal to that of the formula after the step 3) is finished, heating to 70+/-2 ℃ and mixing and banburying for 60-75 seconds;
5) Step 4), adding hydroxyl silicone oil in the formula weight part after the step 4) is completed, mixing and banburying for 60-75 seconds;
6) Step 5), adding the phenyl ether silicon rubber in the weight part of the formula after the step is completed, and mixing and banburying for 60-75 seconds;
7) Step 6), adding the heat-resistant additive nano mica powder, cerium oxide and ferric oxide according to the weight parts of the formula after the step 6) is completed, and mixing and banburying for 120-150 seconds to obtain a mixed sizing material;
8) Filtering the mixed sizing material, and putting the mixed sizing material into a sizing filter for sizing;
9) Discharging sheets by an open mill, and discharging sheets by the open mill by using the filter gum obtained in the step 8);
10 Aging the film obtained in the step 9) at normal temperature,
11 Introducing cooling water into the aged film obtained in the step 10) on an open mill to carry out roller wrapping;
12 Weighing the bibiwulfurizing agent according to the formula, adding the biwulfurizing agent into the film obtained in the step 11), and continuously wrapping the film.
Preferably, the aging time in step 10) is 24 hours or longer.
Preferably, in the step 11), the roll gap is adjusted to 8-10mm and gradually reduced to 2-3mm, and the roll is wrapped on an open mill for 8-10 times. Step 12) continues wrapping the roll 10 times.
Preferably, after step 12), the roll gap is gradually adjusted to 0.5-1mm for thinning through until the film is smooth and bubble-free.
Preferably, the step 8) of the adhesive filtering adopts three layers of metal filter screens, the mesh numbers of the metal filter screens are respectively 60, 80 and 100, and the temperature of the double rollers is 45-50 ℃ when the rollers are wrapped.
The invention has the beneficial effects that:
1. the high-temperature-resistant high-strength torsion-resistant high-flame-retardant cable insulating sheath material disclosed by the invention takes boron silicone rubber as a main rubber, takes low-phenyl silicone rubber and methyl vinyl silicone rubber as the 2 nd and 3 rd auxiliary rubber, takes phenyl ether silicon rubber as the 4 th reinforcing modified rubber, combines the advantages of the 4 kinds of rubber, so that the whole formula is resistant to heat at about 300-370 ℃ and has excellent insulating property, flame retardant property and tensile strength.
2. The high-temperature-resistant high-strength torsion-resistant high-flame-retardant cable insulating sheath material disclosed by the invention is prepared by adding 5-10 parts of nano mica powder, 1-4 parts of cerium oxide, 2-5 parts of ferric oxide, and lifting the silicon rubber insulating sheath material from the normal working temperature of 180 ℃ to 300-370 ℃ in cooperation with a boron silicon rubber, low-phenyl silicon rubber and methyl vinyl silicon rubber raw rubber system.
3. When the high-temperature-resistant high-strength torsion-resistant high-flame-retardant cable insulation sheath material is used for cable insulation, the long-term allowable working temperature of the conductor can reach 300 ℃ which is far higher than the long-term allowable working temperature of a conventional silicone rubber sheet conductor for wires and cables by 180 ℃, and the long-term allowable working temperature of the ethylene-propylene insulation sheet is 90 ℃, so that the current-carrying capacity of cables with the same section is greatly improved, the required cable section is smaller under the condition of the same current-carrying capacity, the cost is effectively reduced, the weight of the cable is reduced, and the cable is more convenient to install.
4. The high-temperature-resistant high-strength torsion-resistant high-flame-retardant cable insulating sheath material adopts the double-penta vulcanizing agent to have high decomposition temperature, is not easy to pre-crosslink in a screw rod when being extruded by adopting continuous vulcanization rubber extrusion equipment (length-diameter ratio: 12-16), so that cable enterprises can produce the cable without purchasing a special extruder for silicone rubber by adopting the conventional continuous vulcanization rubber extrusion equipment (length-diameter ratio: 12-16), and the investment of fixed assets is reduced.
In a word, the high-temperature-resistant high-strength torsion-resistant high-flame-retardant cable insulation sheath material has excellent acid resistance, chemical solvent resistance, radiation resistance and high flame retardance while having high-temperature-resistant high-strength torsion resistance, and is applicable to cable insulation and sheaths in extremely harsh environments such as aviation, chemical industry, atomic energy industry and the like besides being used for cable insulation and sheaths in metallurgical industry.
Detailed Description
Embodiment case 1: 90 parts of boron silicon rubber, 5 parts of low-phenyl silicon rubber, 5 parts of methyl vinyl silicon rubber, 10 parts of phenylene oxide silicon rubber, 40 parts of fumed silica, 10 parts of titanium dioxide, 10 parts of quartz powder, 10 parts of diatomite, 2 parts of diphenyl silicon glycol, 2 parts of hydroxyl silicone oil, 5 parts of ferric oxide, 8 parts of nano mica powder, 4 parts of cerium oxide and 1-1.5 parts of bis-penta vulcanizing agent
Embodiment case 2: 80 parts of boron silicon rubber, 10 parts of low-phenyl silicon rubber, 10 parts of methyl vinyl silicon rubber, 10 parts of phenylene oxide silicon rubber, 40 parts of fumed silica, 10 parts of titanium dioxide, 10 parts of quartz powder, 10 parts of diatomite, 2 parts of diphenyl silicon glycol, 2 parts of hydroxyl silicone oil, 5 parts of ferric oxide, 7 parts of nano mica powder, 3 parts of cerium oxide and 1-1.5 parts of bis-penta-vulcanizing agent
Embodiment 3:
70 parts of boron silicon rubber, 15 parts of low-phenyl silicon rubber, 15 parts of methyl vinyl silicon rubber, 8 parts of phenyl ether silicon rubber, 45 parts of fumed silica, 10 parts of titanium dioxide, 20 parts of quartz powder, 10 parts of diatomite, 2 parts of diphenyl silicon glycol, 2 parts of hydroxyl silicone oil, 5 parts of ferric oxide, 8 parts of nano mica powder, 3 parts of cerium oxide and 1-1.5 parts of bis-penta vulcanizing agent.
Embodiment 4: 60 parts of boron silicon rubber, 20 parts of low-phenyl silicon rubber, 20 parts of methyl vinyl silicon rubber, 7 parts of phenylene oxide silicon rubber, 40 parts of fumed silica, 10 parts of titanium dioxide, 15 parts of quartz powder, 10 parts of diatomite, 2 parts of diphenyl silicon glycol, 2 parts of hydroxyl silicone oil, 5 parts of ferric oxide, 5 parts of nano mica powder, 4 parts of cerium oxide and 1-1.5 parts of bis-penta vulcanizing agent
Embodiment case 5: 50 parts of boron silicon rubber, 25 parts of low-phenyl silicon rubber, 25 parts of methyl vinyl silicon rubber, 5 parts of phenyl ether silicon rubber, 35 parts of fumed silica, 10 parts of titanium dioxide, 15 parts of quartz powder, 10 parts of diatomite, 2 parts of diphenyl silicon glycol, 2 parts of hydroxyl silicone oil, 5 parts of ferric oxide, 7 parts of nano mica powder, 4 parts of cerium oxide and 1-1.5 parts of bis-penta vulcanizing agent.
Embodiment 6: 50 parts of boron silicon rubber, 25 parts of low-phenyl silicon rubber, 25 parts of methyl vinyl silicon rubber, 5 parts of phenyl ether silicon rubber, 35 parts of fumed silica, 10 parts of titanium dioxide, 15 parts of quartz powder, 10 parts of diatomite, 2 parts of diphenyl silicon glycol, 2 parts of hydroxyl silicone oil, 5 parts of ferric oxide, 3 parts of nano mica powder, 2 parts of cerium oxide and 1-1.5 parts of bis-penta vulcanizing agent.
For the formulation of the 6 specific examples above, the inventors manufactured the following procedure:
weighing one half of raw rubber (boron silicon rubber, low-phenyl silicon rubber and methyl vinyl silicon rubber) by weight of the formula, and putting the raw rubber into an internal mixer. Simultaneously adding one third of the formula weight parts of fumed silica, titanium dioxide, quartz powder and diatomite into an internal mixer.
And closing the charging door to mix the boron silicon rubber, the low-phenyl silicon rubber and the methyl vinyl silicon rubber, and mixing the white carbon black, the titanium pigment and the quartz powder by a gas phase method, and banburying the diatomite in a banburying mixer for 120-150 seconds.
The internal mixer was turned on and one half of the raw rubber (borosilicate rubber + low phenyl silicone rubber + methyl vinyl silicone rubber) by weight of the formulation was added again into the internal mixer. Simultaneously, adding one third of the formula weight parts of fumed silica, titanium dioxide, quartz powder and diatomite into an internal mixer, and carrying out internal mixing for 120-150 seconds.
Adding one third of the weight parts of the formula of the fumed silica, titanium dioxide and quartz powder again, adding diatomite into an internal mixer, and heating to 70+/-2 ℃ for internal mixing for 120-150 seconds.
Adding the diphenyl silicon glycol with the weight portion of the formula, heating to 70+/-2 ℃ and mixing and banburying for 60-75 seconds.
Adding the hydroxyl silicone oil in the weight part of the formula, mixing and banburying for 60-75 seconds.
Adding the weight portions of the phenylate silicon rubber into the mixture, mixing and banburying for 60-75 seconds.
Adding the heat-resistant additive nano mica powder in the formula in parts by weight, mixing and banburying the mixture for 120 to 150 seconds.
And (3) filtering the rubber, namely putting the mixed rubber into a rubber filter to start rubber filtering, wherein a machine head filter screen adopts three layers of metal filter screens, and the meshes of the three layers of metal filter screens are respectively 60, 80 and 100. Every 300 kg of filter screen should be changed once, when the filter screen is suddenly damaged, the change should be stopped immediately, the sizing material filtered out by the broken filter screen should be strained, and when the filter screen is changed, the sizing material at the position 3mm away from the filter screen should be cut off for straining the rubber again.
And (3) discharging the sheet by an open mill, weighing 10kg (each sheet) of the sheet, wrapping the sheet by a roll on the open mill, placing the sheet on a material rack, and standing for more than 24 hours to ensure that each compounding agent is uniformly dispersed.
11 open mill vulcanizing
11.1 take out step 10 the film is parked for more than 24 hours. Starting an open mill, opening a cooling water valve, adjusting the roll gap to 8-10mm, gradually reducing the roll gap to 2-3mm, and wrapping the roll on the open mill for 8-10 times.
11.2, accurately adding the double-di-penta vulcanizing agent according to the formula weighing, and continuously wrapping the roller for 10 times.
And 11.3, gradually adjusting the roll spacing to 0.5-1mm for carrying out thin pass for 5 times, (the film has smooth surface and no bubbles, and the thin pass number is increased if the film is not smooth), and then adjusting the roll spacing to 6-8mm for discharging the film and placing the film on a material frame.
11.4 during operation, the twin-roll temperature was 45-50 ℃.
The inventor records experimental data and compares the experimental data with the prior art, and particularly see table 1, and the data in table 1 shows that the invention has the following advantages compared with the current silicone rubber compound in the cable industry:
the tensile strength is obviously improved by 40% -100% before aging.
The heat resistance is obviously improved, so that the silicon rubber film is improved from the conductor long-term allowable working temperature of 180 ℃ to the conductor long-term allowable working temperature of 300-370 ℃. The tensile strength and elongation at break measured after aging at 370.+ -. 2 ℃ for 10 days in example 1 after increasing the aging test temperature from 200 ℃ to 370 ℃ are similar to the data measured after aging at 200.+ -. 2 ℃ for 10 days in the existing silicone rubber compound.
The breakdown field strength is increased from 19-20kv/mm to 21-25kv/mm.
Table 1: comparison of the performance of the current silicon rubber insulating material, silicon rubber sheath material and implementation cases in the cable industry
Claims (10)
1. The high-temperature-resistant high-strength torsion-resistant high-flame-retardant cable insulating sheath material comprises the following raw materials in parts by weight: 50-90 parts of borosilicate rubber, 5-25 parts of low-phenyl silicone rubber, 5-25 parts of methyl vinyl silicone rubber, 2-10 parts of phenyl ether silicon rubber, 30-45 parts of fumed silica, 10-20 parts of titanium dioxide, 5-20 parts of quartz powder, 5-20 parts of kieselguhr, 2-5 parts of diphenyl silicon glycol, 2-5 parts of hydroxyl silicone oil, 2-5 parts of ferric oxide, 5-10 parts of nano mica powder, 1-4 parts of cerium oxide and 0.5-2 parts of bis-penta vulcanizing agent.
2. The high-temperature-resistant high-strength torsion-resistant high-flame-retardant cable insulating sheath material according to claim 1, wherein the low-phenyl silicone rubber is preferably 6% -9% in phenyl content, the phenyl content refers to the molar percentage of phenyl chain units contained in silicone rubber molecules to the total number of all chain units, and the phenyl content is expressed by the ratio Ph (%) of the number of the chain units containing phenyl groups to the total number of polysiloxane molecule chain units.
3. The high-temperature-resistant high-strength torsion-resistant high-flame-retardant cable insulating sheath material according to claim 1, wherein the methyl vinyl silicone rubber is preferably 57-63 ten thousand in molecular weight, 0.13-0.17% in vinyl content, wherein the vinyl content refers to the mole percentage content of vinyl chain units in the total chain units in the silicone rubber molecule, and the mole percentage content is expressed by the ratio Vi (%) of the number of the vinyl chain units to the total number of polysiloxane molecule chain units.
4. The high-temperature-resistant high-strength torsion-resistant high-flame-retardant cable insulating sheath material according to claim 1, wherein the gas-phase white carbon black is 40-45 parts, titanium dioxide is 10-15 parts, quartz powder is 10-20 parts, diatomite is 10-15 parts and nano mica powder is 5-8 parts.
5. A method for preparing the high temperature resistant, high strength, torsion resistant and high flame retardant cable insulation sheath material according to any one of claims 1-4, comprising the steps of:
1) Weighing one half of raw rubber in the formula, putting the raw rubber into an internal mixer, wherein the raw rubber is boron silicon rubber, low-phenyl silicon rubber and methyl vinyl silicon rubber, and simultaneously putting one third of fumed silica, titanium dioxide, quartz powder and diatomite in the formula into the internal mixer, and closing the internal mixer to carry out internal mixing for 120-150 seconds;
2) And opening the internal mixer, and putting one half of raw rubber (boron silicon rubber, low-phenyl silicon rubber and methyl vinyl silicon rubber) in the formula into the internal mixer again. Simultaneously adding one third of the formula weight parts of fumed silica, titanium dioxide and quartz powder into an internal mixer, and carrying out internal mixing for 120-150 seconds;
3) Adding one third of the weight parts of the fumed silica, titanium dioxide and quartz powder into the formula again, adding diatomite into an internal mixer, and carrying out internal mixing for 120-150 seconds at 70+/-2 ℃;
4) Adding the diphenyl silicon glycol of which the weight part is equal to that of the formula after the step 3) is finished, heating to 70+/-2 ℃ and mixing and banburying for 60-75 seconds;
5) Step 4), adding hydroxyl silicone oil in the formula weight part after the step 4) is completed, mixing and banburying for 60-75 seconds;
6) Step 5), adding the phenyl ether silicon rubber in the weight part of the formula after the step is completed, and mixing and banburying for 60-75 seconds;
7) Step 6), adding the heat-resistant additive nano mica powder, cerium oxide and ferric oxide according to the weight parts of the formula after the step 6) is completed, and mixing and banburying for 120-150 seconds to obtain a mixed sizing material;
8) Filtering the mixed sizing material, and putting the mixed sizing material into a sizing filter for sizing;
9) Discharging sheets by an open mill, and discharging sheets by the open mill by using the filter gum obtained in the step 8);
10 Aging the film obtained in the step 9) at normal temperature,
11 Introducing cooling water into the aged film obtained in the step 10) on an open mill to carry out roller wrapping;
12 Weighing the bibiwulfurizing agent according to the formula, adding the biwulfurizing agent into the film obtained in the step 11), and continuously wrapping the film.
6. The method for preparing the high-temperature-resistant high-strength torsion-resistant high-flame-retardant cable insulation sheath material according to claim 5, wherein the aging time in the step 10) is more than 24 hours.
7. The method for preparing the high-temperature-resistant high-strength torsion-resistant high-flame-retardant cable insulating sheath material according to claim 5, wherein in the step 11), the roll gap is adjusted to 8-10mm and gradually reduced to 2-3mm, and the roll is wrapped on an open mill for 8-10 times.
8. The method for preparing the high-temperature-resistant high-strength torsion-resistant high-flame-retardant cable insulation sheath material according to claim 5, wherein the step 12) is carried out for 10 times.
9. The method for preparing the high-temperature-resistant high-strength torsion-resistant high-flame-retardant cable insulating sheath material, which is characterized in that the roller spacing is gradually adjusted to 0.5-1mm after the step 12) for carrying out thin pass until the film is smooth on the surface and has no bubbles.
10. The method for preparing the high-temperature-resistant high-strength torsion-resistant high-flame-retardant cable insulating sheath material according to claim 5, wherein in the step 8), the filtering glue adopts three layers of metal filter screens, the mesh numbers of the metal filter screens are respectively 60, 80 and 100, and the double-roller temperature is 45-50 ℃ during roller wrapping.
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