CN114188109B - Preparation method and application of magnesium oxide for high-impedance high-voltage breakdown prevention mineral insulated cable - Google Patents
Preparation method and application of magnesium oxide for high-impedance high-voltage breakdown prevention mineral insulated cable Download PDFInfo
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- CN114188109B CN114188109B CN202111513566.0A CN202111513566A CN114188109B CN 114188109 B CN114188109 B CN 114188109B CN 202111513566 A CN202111513566 A CN 202111513566A CN 114188109 B CN114188109 B CN 114188109B
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- mineral insulated
- magnesium oxide
- insulated cable
- voltage breakdown
- impedance
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- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 title claims abstract description 140
- 239000000395 magnesium oxide Substances 0.000 title claims abstract description 94
- 229910052500 inorganic mineral Inorganic materials 0.000 title claims abstract description 62
- 239000011707 mineral Substances 0.000 title claims abstract description 62
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 title claims abstract description 48
- 230000015556 catabolic process Effects 0.000 title claims abstract description 26
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 230000002265 prevention Effects 0.000 title description 8
- 239000000843 powder Substances 0.000 claims abstract description 31
- 229920002545 silicone oil Polymers 0.000 claims abstract description 22
- 230000002209 hydrophobic effect Effects 0.000 claims abstract description 19
- 239000013078 crystal Substances 0.000 claims abstract description 18
- 238000002156 mixing Methods 0.000 claims abstract description 18
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000003085 diluting agent Substances 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract 6
- 238000003756 stirring Methods 0.000 claims description 20
- 238000009413 insulation Methods 0.000 claims description 18
- 238000001035 drying Methods 0.000 claims description 10
- 125000000118 dimethyl group Chemical group [H]C([H])([H])* 0.000 claims description 9
- 238000012216 screening Methods 0.000 claims description 8
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 claims description 4
- 238000010790 dilution Methods 0.000 claims description 2
- 239000012895 dilution Substances 0.000 claims description 2
- 229910052739 hydrogen Inorganic materials 0.000 claims description 2
- 239000001257 hydrogen Substances 0.000 claims description 2
- -1 methyl hydrogen Chemical class 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- 229920002050 silicone resin Polymers 0.000 claims description 2
- 239000002904 solvent Substances 0.000 claims description 2
- 238000003723 Smelting Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 3
- 239000000945 filler Substances 0.000 abstract description 3
- 238000005485 electric heating Methods 0.000 abstract description 2
- 238000012546 transfer Methods 0.000 abstract description 2
- 239000000203 mixture Substances 0.000 abstract 1
- 239000000463 material Substances 0.000 description 7
- 238000007873 sieving Methods 0.000 description 7
- 238000002844 melting Methods 0.000 description 6
- 230000008018 melting Effects 0.000 description 6
- 238000004806 packaging method and process Methods 0.000 description 6
- 239000002131 composite material Substances 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 2
- 239000012752 auxiliary agent Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000010292 electrical insulation Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/02—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances
- H01B3/10—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances metallic oxides
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B19/00—Apparatus or processes specially adapted for manufacturing insulators or insulating bodies
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Inorganic Chemistry (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The invention discloses a preparation method and application of magnesium oxide for a high-impedance high-voltage breakdown-preventing mineral insulated cable, wherein the preparation method of the magnesium oxide for the high-impedance high-voltage breakdown-preventing mineral insulated cable is characterized in that fused magnesia blocks are crushed, screened, magnetically separated and dried to obtain crystal fused magnesia powder; mixing the crystal fused magnesia powder with organic silicone oil diluent according to the weight ratio of 100:0.3-0.6 to prepare magnesia for the hydrophobic mineral insulated cable; and then the mixture is uniformly stirred with the electrofused alumina according to the weight ratio of 100:5-20, and the magnesia for the high-impedance high-voltage breakdown-preventing mineral insulated cable is obtained. The method disclosed by the invention is prepared by uniformly mixing the electric smelting alumina and the magnesium oxide for the mineral insulated cable according to a certain weight ratio by utilizing the characteristic of high resistance and high voltage breakdown resistance of the electric smelting alumina on the basis of the magnesium oxide for the mineral insulated cable, and the heat transfer effect is obviously improved when the electric smelting alumina is used as the filler of the insulating layer of the electric heating tube.
Description
Technical Field
The invention relates to the field of magnesium oxide for mineral insulated cables, in particular to a preparation method and application of magnesium oxide for a high-impedance high-voltage breakdown-preventing mineral insulated cable.
Background
Magnesium oxide for mineral insulated cables is an important insulating high temperature resistant filler material having excellent high-resistance insulating properties and high thermal conductivity, and is widely used in various mineral insulated cables. When the traditional mineral insulated cable is made of magnesium oxide, calcined silicate is doped in an original stirring mode to be added into oxide to serve as an auxiliary agent, so that the electrical insulation performance is improved, and the auxiliary agent has poor electrical impedance capability and is affected by high temperature to form a severe low-resistance effect in the MI cable, so that the electrical breakdown resistance of the cable is seriously reduced in a heating process, and great potential safety hazard and energy waste loss are caused.
Disclosure of Invention
The invention provides a preparation method and application of magnesium oxide for a high-impedance high-voltage breakdown-resistant mineral insulated cable, and aims to solve the problem of poor electrical impedance insulation capability of magnesium oxide powder for a mineral insulated cable for an MI cable.
In order to achieve the above object, the technical scheme of the present invention is as follows:
a preparation method of magnesium oxide for a high-impedance high-voltage breakdown-resistant mineral insulated cable comprises the following steps:
S1: crushing, screening, magnetically separating and drying the fused magnesia to obtain crystal fused magnesia powder;
S2: mixing the crystalline fused magnesia powder obtained in the step S1 with organic silicone oil diluent according to the weight ratio of 100:0.3-0.6 to prepare magnesia for the hydrophobic mineral insulated cable;
S3: and (2) uniformly stirring the magnesium oxide for the hydrophobic mineral insulated cable obtained in the step (S2) and the electric smelting aluminum oxide according to the weight ratio of 100:5-20 to obtain the magnesium oxide for the high-impedance high-voltage breakdown prevention mineral insulated cable.
Further, in the step S1, the particle size of the crystalline fused magnesia powder is 40-325 days.
Further, in the step S1, the drying temperature is 300-500 ℃ and the time is 60-120min.
Further, in the step S2, the silicone oil in the silicone oil diluent is one or more selected from methyl hydrogen silicone oil, dimethyl silicone oil and silicone resin; the diluent in the organic silicone oil diluent is one or more selected from dimethylbenzene, solvent oil and gasoline.
Further, in the step S2, the dilution ratio of the organic silicone oil diluent is 100:0.3-0.9.
Further, in the step S3, the density of the fused alumina is not less than 4.2g/cm 3, and the electrical insulation strength is not less than 3500V/mm.s.
Further, in the step S3, the stirring rotation speed is 50-100r/min, and the stirring time is 15-30min.
The magnesium oxide for the high-impedance high-voltage breakdown prevention mineral insulated cable is prepared by the preparation method of the magnesium oxide for the high-impedance high-voltage breakdown prevention mineral insulated cable.
The application of magnesium oxide for high-impedance high-voltage breakdown-preventing mineral insulated cable in MI cable.
The invention discloses a preparation method and application of magnesium oxide for a high-impedance high-voltage breakdown-resistant mineral insulated cable, which are prepared by uniformly mixing electric smelting aluminum oxide and magnesium oxide for a mineral insulated cable according to a certain weight ratio by utilizing the characteristic of high-impedance high-voltage breakdown resistance of electric smelting aluminum oxide on the basis of magnesium oxide for a mineral insulated cable, and obviously improve the heat transfer effect when the magnesium oxide is used as an electric heating tube insulating layer filler. When the composite electrical impedance insulation capacity is applied to the preparation of the MI cable for testing, the composite electrical impedance insulation capacity is improved by more than 20%, the compressive strength is improved by more than 10%, the high temperature resistance of the MI cable is ensured, the electrical impedance insulation capacity and the service life of the MI cable are improved, and the composite electrical impedance insulation capacity has a wide application prospect.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention are clearly and completely described, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1:
(1) Crushing, screening and magnetically separating the fused magnesia lump materials, and drying at 300 ℃ for 60 minutes to obtain 60-mesh crystal fused magnesia powder;
(2) The obtained crystal fused magnesia powder and dimethyl organic silicone oil are mixed according to the weight ratio of 100:0.5, mixing and stirring for 15 minutes to prepare magnesium oxide for the hydrophobic mineral insulated cable;
(3) The magnesia powder for the hydrophobic mineral insulated cable is mixed with electric melting alumina with the density of 4.2g/cm 3 and the electric insulation strength of more than 3500V/mm.s according to the weight ratio of 100:5, uniformly mixing, stirring for 15 minutes at 50r/min, sieving, and packaging to obtain the magnesium oxide for the high-impedance high-voltage breakdown-preventing mineral insulated cable.
Example 2:
(1) Crushing, screening and magnetically separating the fused magnesia lump materials, and drying at 300 ℃ for 90 minutes to obtain 60-mesh crystal fused magnesia powder;
(2) Mixing and stirring the obtained crystal fused magnesia powder and dimethyl organic silicone oil for 16 minutes according to the weight ratio of 100:0.6 to prepare the magnesia for the hydrophobic mineral insulated cable;
(3) The obtained magnesia powder for hydrophobic mineral insulated cable and electric melting alumina with the density of 4.25g/cm 3 and the electric insulation strength of more 3600V/mm.s are mixed according to the weight ratio of 100:8, uniformly mixing, stirring for 18 minutes at 60r/min, sieving, and packaging to obtain the magnesium oxide for the high-impedance high-voltage breakdown-preventing mineral insulated cable.
Example 3:
(1) Crushing, screening and magnetically separating the fused magnesia lump materials, and drying at 360 ℃ for 100 minutes to obtain 60-mesh crystal fused magnesia powder;
(2) The obtained crystal fused magnesia powder and dimethyl organic silicone oil are mixed according to the weight ratio of 100:0.6, mixing and stirring for 15 minutes to prepare magnesium oxide for the hydrophobic mineral insulated cable;
(3) Uniformly mixing the obtained magnesia powder for the hydrophobic mineral insulated cable with electric melting alumina with the density of 4.3g/cm 3 and the electric insulation strength of 3800V/mm.s according to the weight ratio of 100:12, stirring for 16 minutes at 70r/min, sieving and packaging to obtain the magnesia for the high-impedance high-voltage breakdown prevention mineral insulated cable.
Example 4
(1) Crushing, screening and magnetically separating the fused magnesia lump materials, and drying at 380 ℃ for 85 minutes to obtain 60-mesh crystal fused magnesia powder;
(2) Mixing and stirring the obtained crystal fused magnesia powder and dimethyl organic silicone oil for 15 minutes according to the weight ratio of 100:0.6 to prepare the magnesia for the hydrophobic mineral insulated cable;
(3) Uniformly mixing the obtained magnesia powder for the hydrophobic mineral insulated cable with electric melting alumina with the density of 4.35g/cm 3 and the electric insulation strength of 4000V/mm.s more according to the weight ratio of 100:20, stirring for 16 minutes at 75r/min, sieving and packaging to obtain the magnesia for the high-impedance high-voltage breakdown prevention mineral insulated cable.
Example 5:
(1) Crushing, screening and magnetically separating the fused magnesia lump materials, and drying at 350 ℃ for 120 minutes to prepare 60-mesh crystal fused magnesia powder;
(2) The obtained crystal fused magnesia powder and dimethyl organic silicone oil are mixed according to the weight ratio of 100:0.6, mixing and stirring for 15 minutes to prepare magnesium oxide for the hydrophobic mineral insulated cable;
(3) The magnesia powder for the hydrophobic mineral insulated cable is mixed with electric melting alumina with the density of 4.2g/cm 3 and the electric insulation strength of 3600V/mm.s according to the weight ratio of 100:5, uniformly mixing, stirring for 18 minutes at 60r/min, sieving, and packaging to obtain the magnesium oxide for the high-impedance high-voltage breakdown-preventing mineral insulated cable.
Example 6:
(1) Crushing, screening and magnetically separating the fused magnesia blocks, and drying at 320 ℃ for 60 minutes to obtain 60-mesh crystal fused magnesia powder;
(2) The obtained crystal fused magnesia powder and dimethyl organic silicone oil are mixed according to the weight ratio of 100:0.6, mixing and stirring for 15 minutes to prepare magnesium oxide for the hydrophobic mineral insulated cable;
(3) The magnesia powder for the hydrophobic mineral insulated cable is mixed with electric melting alumina with the density of 4.2g/cm 3 and the electric insulation strength of 3600V/mm.s according to the weight ratio of 100:16 are evenly mixed, stirred for 20 minutes at 60r/min, sieved and packaged, and the magnesium oxide for the high-impedance high-voltage breakdown-resistant mineral insulated cable is prepared.
Control example:
(1) Crushing, sieving and magnetically separating the fused magnesia lump materials to obtain 60-mesh crystal fused magnesia powder;
(2) Mixing and stirring the obtained crystal fused magnesia powder and dimethyl organic silicone oil for 15 minutes according to the weight ratio of 100:0.6 to prepare the magnesia for the hydrophobic mineral insulated cable;
(3) Uniformly mixing the obtained magnesium oxide powder for the hydrophobic mineral insulated cable and silicate additive according to the weight ratio of 100:5, stirring for 20 minutes by 75r/min, heating the dispersing agent, uniformly stirring, sieving and packaging to obtain the magnesium oxide for the common mineral insulated cable.
The physical properties and insulation properties, high voltage breakdown resistance, volume surface resistivity of the 6 high-resistance high-voltage breakdown-preventing magnesium oxide powders for mineral insulated cables in examples 1 to 6 were tested, wherein the flow rate was a model 2# ford cup; the density adopts a tap density meter according to the standard [ JB/T8508-1996 ]; the high voltage breakdown resistance adopts the pressure resistance instrument model: an ET2670A withstand voltage tester; volume surface resistivity measurement adopts model: LST-121 volume surface resistivity meter, specific test results are shown in tables 1-3 below:
TABLE 1 physical Property test
| Numbering device | Flow rate/100 g | Density/cc |
| Comparative example | 38 Seconds | 2.25 G |
| Example 1 | 30 Seconds | 2.32 G |
| Example 2 | 28 Seconds | 2.30 G |
| Example 3 | 29 Seconds | 2.32 G |
| Example 4 | 31 Seconds | 2.31 G |
| Example 5 | 29 Seconds | 2.33 G |
| Example 6 | 30 Seconds | 2.34 G |
Table 2 resistive insulation high voltage breakdown test
| Numbering device | Actual measurement V/30 min |
| Comparative example | 2500 |
| Example 1 | 3100 |
| Example 2 | 3200 |
| Example 3 | 3300 |
| Example 4 | 3500 |
| Example 5 | 3400 |
| Example 6 | 3350 |
TABLE 3 volume surface resistivity
As can be seen from tables 1-3, the flow rate and density of the prepared magnesium oxide for the high-impedance high-voltage breakdown prevention mineral insulated cable are both superior to those of the magnesium oxide for the common mineral insulated cable, and the resistance insulation high-voltage breakdown resistance and the volume surface resistivity are both superior to those of the magnesium oxide for the common mineral insulated cable; when the composite electrical impedance insulation capacity is applied to the preparation of the MI cable for testing, the composite electrical impedance insulation capacity is improved by more than 20%, the compressive strength is improved by more than 10%, the high temperature resistance of the MI cable is ensured, and the electrical impedance insulation capacity and the service life of the MI cable are improved.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (8)
1. The preparation method of the magnesium oxide for the high-impedance high-voltage breakdown-resistant mineral insulated cable is characterized by comprising the following steps of:
S1: crushing, screening, magnetically separating and drying the fused magnesia to obtain crystal fused magnesia powder;
S2: and (2) mixing the crystalline fused magnesia powder obtained in the step (S1) with organic silicone oil diluent according to the weight ratio of 100:0.3 to 0.6 to prepare magnesium oxide for the hydrophobic mineral insulated cable;
S3: the magnesium oxide for the hydrophobic mineral insulated cable obtained in the step S2 and the electrofused alumina are mixed according to the weight ratio of 100:5-20, stirring uniformly to obtain the magnesium oxide for the high-impedance high-voltage breakdown-preventing mineral insulated cable;
In the step S3, the density of the fused alumina is more than or equal to 4.2g/cm 3, and the electric insulation strength is more than or equal to 3500V/mm.s.
2. The method for preparing magnesium oxide for high-resistance high-voltage breakdown-preventing mineral insulated cable according to claim 1, wherein in the step S1, the particle size of the crystalline fused magnesia powder is 40-325 mesh.
3. The method for preparing the magnesium oxide for the high-impedance high-voltage breakdown preventing mineral insulated cable according to claim 1, wherein in the step S1, the drying temperature is 300-500 ℃ and the time is 60-120min.
4. The method for preparing the magnesium oxide for the high-impedance high-voltage breakdown-preventing mineral insulated cable according to claim 1, wherein in the step S2, the organic silicone oil in the organic silicone oil diluent is one or more selected from methyl hydrogen silicone oil, dimethyl organic silicone oil and silicone resin; the diluent in the organic silicone oil diluent is one or more selected from dimethylbenzene, solvent oil and gasoline.
5. The method for preparing the magnesium oxide for the high-impedance high-voltage breakdown preventing mineral insulated cable according to claim 1, wherein in the step S2, the dilution ratio of the organic silicone oil diluent is 100:0.3-0.9.
6. The method for preparing the magnesium oxide for the high-impedance high-voltage breakdown preventing mineral insulated cable according to claim 1, wherein in the step S3, the stirring speed is 50-100r/min, and the time is 15-30min.
7. A magnesium oxide for a high-resistance high-voltage breakdown preventing mineral insulated cable, characterized by being prepared by a preparation method of the magnesium oxide for a high-resistance high-voltage breakdown preventing mineral insulated cable according to any one of claims 1 to 6.
8. Use of a magnesium oxide for high-impedance high-voltage breakdown preventing mineral insulated cables according to claim 7 in MI cables.
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