CN102786293A - Production method for magnesium oxide insulating preform for mineral heating cables - Google Patents
Production method for magnesium oxide insulating preform for mineral heating cables Download PDFInfo
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- CN102786293A CN102786293A CN201210262836XA CN201210262836A CN102786293A CN 102786293 A CN102786293 A CN 102786293A CN 201210262836X A CN201210262836X A CN 201210262836XA CN 201210262836 A CN201210262836 A CN 201210262836A CN 102786293 A CN102786293 A CN 102786293A
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Abstract
The invention discloses a production method for a magnesium oxide insulating preform for mineral heating cables. The method includes the following steps: magnesium oxide powder and silica powder are first mixed according to the weight proportion of 100:(0.5 to 2) and then dryly ball-milled, so that mixed powder is obtained; the mixed powder, bonder, plasticizer and lubricant are then mixed according to the weight proportion of 100:(5 to 15):(1 to 3):(1 to 2), added into a vacuum pug mill and mixed with distilled water in the vacuum pug mill, so that uniform plastic pug is obtained, the plastic pug is hermetically aged for 24 hours and then extruded by the extrusion molding process, so that a tubular body is obtained, and after the body is dried and then calcined under 1000 DEG C to 1400 DEG C for 1 to 8 hours, the magnesium oxide insulating preform is obtained. The produced magnesium oxide insulating preform can improve the defects of easy moisture absorption, ununiform filling density and the like in the direct usage of magnesium oxide powder, and effectively improves the electric insulating property of a magnesium oxide insulating layer, and the production efficiency is increased.
Description
Technical field
The invention belongs to mineral heating cables technical field; Be specifically related to the preparation method of a kind of mineral heating cables with Natural manganese dioxide insulation prefabricated pipe rod; Use the Natural manganese dioxide insulation prefabricated pipe rod of this method preparation; Shortcomings such as the easy moisture absorption that exists in the time of can improving direct use can magnesia powder, can density unevenness have been improved the electrical insulation capability of Natural manganese dioxide insulation layer effectively, have improved production efficiency.
Background technology
That Natural manganese dioxide has is high temperature resistant, electrical isolation, high heat conduction, high thermal expansion coefficient, alkali resistance are good, excellent high-temperature stability and anti-radiation performance, good a series of advantages such as photopermeability, often is used as the electrical isolation packing material of electrothermal tube and mineral heating cables.The cable that mineral insulated cable is embedded in copper conductor thorough drying, closely makes in the real seamless copper pipe of magnesium oxide powder as insulating material of matter.Because whole cable all is made up of inorganic materials, it is compared with the cable that uses organic insulation, has outstanding fire-resistant, high temperature resistant, radiotolerant characteristic, and its life-time service temperature can reach 500～600 ℃.Be mainly used in the power transmission and distribution in high temperature or high corrosion place and the signal transmission of loop, like high temperature, irradiation or high corrosion fields such as oil, chemical industry, metallurgy, boats and ships, nuclear power, aerospace.In addition, this cable is because its constructional feature at many large public buildings, has also obtained a large amount of uses in the distribution line like place fire-fighting equipments such as airport, commercial square.
At present, the general preparation process of mineral cable is: conductor (like manganese-copper or nickel chromium triangle material etc.) is put into metal (like stainless steel or copper-nickel alloy etc.) sheath, and powdery Natural manganese dioxide insulating material is inserted in can again; Then through a series of drawing and annealing operation; Can reduce cable size to desired size, in pulling process, powder is further pulverized compacting; Make its final tamped density reach about 75 ~ 80% of actual crystal density, process mineral insulated cable.Directly can fill the magnesia powder insulating material exist below some problems: (1) magnesia powder is exposed in the air, absorbs moisture and carbonic acid gas easily and becomes Marinco H or magnesium basic carbonate gradually, thereby its electrical insulation capability is reduced, even lose; (2) tamped density of can magnesia powder is not high; Usually can only reach about 50%; And the homogeneity of filling is relatively poor, brings bigger difficulty for like this draw technology in later stage, need carry out the annealed cycle production process of drawing-annealing-drawing again-more repeatedly; (3) directly the production efficiency of filling magnesia powder is not high, especially to the long tamped density that can't realize ideal apart from the production of mineral heating cables.
Summary of the invention
The objective of the invention is to overcome the weak point of prior art; The preparation method of a kind of mineral heating cables with Natural manganese dioxide insulation prefabricated pipe rod is provided; Use the Natural manganese dioxide insulation prefabricated pipe rod of this method preparation; The powder that exists in the time of can improving direct can magnesia powder is prone to moisture absorption, can density unevenness, the not high shortcoming of can efficient, has improved the electrical insulation capability of Natural manganese dioxide insulation layer effectively, has improved production efficiency.And preparation technology of the present invention is simple, and cost is low, is convenient to suitability for industrialized production, helps applying.
Technical scheme of the present invention is following:
A kind of mineral heating cables is with the preparation method of Natural manganese dioxide insulation prefabricated pipe rod, and this method comprises the steps:
1, batch mixing:
At first magnesia powder and silicon dioxide powder are mixed back dry ball milling 4-12h according to the part by weight of magnesia powder: silicon dioxide powder=100:0.5～2, obtain mixed powder; Then with mixed powder and sticker, softening agent, lubricant according to mixed powder: sticker: softening agent: lubricant=100: (5 ~ 15): (1 ~ 3): the part by weight of (1～2) mixes and obtains compound; In vacuum deairing machine, compound and zero(ppm) water (zero(ppm) water add-on be compound weight 5～20%) are mixed refining mud; Obtain uniform plastic pug, seal old 24 hours; The relative vacuum degree is not less than 50% in the vacuum deairing machine;
Said magnesia powder purity>=98.0%, ferro element mass content≤0.05%, granularity>=150 orders;
Said silicon dioxide powder purity >=99.5%, granularity >=200 orders;
Said sticker is methylcellulose gum, Z 150PH, CMC 99.5, Vltra tears etc.;
Said softening agent is glycerine, polyoxyethylene glycol, acetate triglycol etc.;
Said lubricant is whiteruss, tung oil etc.
2, moulding:
Adopt extruding-out process, through changing different extruder heads, can extrude the tubulose base substrate (like half hole, single hole, 2 holes, 3 holes, 4 holes, 5 holes, 6 holes, 12 holes etc.) of different hole counts, hole count, aperture and pipe range can be selected as required; Base substrate descended dry 10-24 hour at 50-80 ℃.
3, calcining:
Under air atmosphere,, obtain Natural manganese dioxide insulation prefabricated pipe rod with 1000～1400 ℃ of calcinings of dried base substrate 1 ~ 8 hour.
The present invention has following beneficial effect:
1, the Natural manganese dioxide prefabricated pipe bar structure of the present invention's preparation is even, and specific density is 60 ~ 80%.Use this Natural manganese dioxide insulation tube rod to have good electrical insulation capability, normality insulation resistance>=1000M Ω, withstand voltage>=1800V/0.5mAS; At surface power density 6～15W/cm
2The time Leakage Current≤0.08mA, withstand voltage>=1800V/0.5mAS; Can use 5000～1200 ℃ of TRs.
2, Natural manganese dioxide prefabricated pipe rod of the present invention is used for the heating core of mineral heating cables and the electrical isolation protecting materials between the shell; The powder that has existed when having improved direct can magnesia powder effectively is prone to moisture absorption, can density unevenness, the not high shortcoming of can efficient; Improve the electrical insulation capability of Natural manganese dioxide insulation layer effectively, improved production efficiency.
3, preparation technology of the present invention is simple, and cost is low, is convenient to suitability for industrialized production, helps applying.
Description of drawings
Fig. 1 is the Natural manganese dioxide prefabricated pipe rod outside view of the present invention's preparation; Wherein: (a) be half hole Natural manganese dioxide prefabricated pipe rod outside view of embodiment 1 preparation; (b) be 3 hole Natural manganese dioxide prefabricated pipe rod outside views of embodiment 2 preparations.
Fig. 2 is the microstructure of the Natural manganese dioxide prefabricated pipe rod of the present invention's preparation.
Embodiment:
Below in conjunction with accompanying drawing and embodiment the present invention is detailed.
Embodiment 1:
Ratio dry ball milling mixing 12h according to magnesia powder: silicon dioxide powder=100:0.5 obtains mixed powder; Selecting methylcellulose gum (molecular weight 500000) for use is sticker; Polyoxyethylene glycol is a softening agent; Tung oil is lubricant, and according to mixed powder: the mixed of sticker: softening agent: lubricant=100:10:2:1 gets compound, vacuum deairing machine with compound and suitable quantity of water (for mixture quality 8%) mixes and refines mud; Obtain uniform plastic pug, the relative vacuum degree is not less than 50%; Seal old 24 hours; Adopt extruding-out process, can extrude the tubulose base substrate in half hole, be cut into length and be about 10cm; Base substrate is 80 ℃ of following thorough dryings.Under air atmosphere, 1380 ℃ of calcinings 2 hours, obtain the Natural manganese dioxide insulation prefabricated pipe rod in half hole, its profile is shown in Fig. 1 (a).Microstructure such as Fig. 2 of prepared Natural manganese dioxide prefabricated pipe rod, by finding out uniform microstructure among the figure, density is higher.The specific density of this prefabricated pipe rod is 76%.Its normality insulation resistance is 1070M Ω, withstand voltage>=1800V/0.5mAS; At surface power density is 15W/cm
2The time Leakage Current be 0.068mA, withstand voltage>=1800V/0.5mAS; Can use 500～1200 ℃ of TRs.
Embodiment 2:
Ratio dry ball milling mixing 6h according to magnesia powder: silicon dioxide powder=100:1 obtains mixed powder; Selecting Z 150PH (17-88) for use is sticker; Glycerine is softening agent; Whiteruss is a lubricant, and then according to mixed powder: the mixed of sticker: softening agent: lubricant=100:15:1.5:1.5 gets compound, in vacuum deairing machine, compound and suitable quantity of water (quality of water be mixture quality 12%) is mixed refining mud; Obtain uniform plastic pug, the relative vacuum degree is not less than 50%; Seal old 24 hours; Adopt extruding-out process, can extrude the tubulose base substrate in 4 holes, be cut into length and be about 10cm; Base substrate is 60 ℃ of following thorough dryings.Under air atmosphere,, obtain the Natural manganese dioxide insulation prefabricated pipe rod in 4 holes 1280 ℃ of calcinings 5 hours.The specific density of this prefabricated pipe rod is 72%.Its normality insulation resistance is 1106M Ω, withstand voltage>=1800V/0.5mAS; At surface power density is 10W/cm
2The time Leakage Current be 0.062mA, withstand voltage>=1800V/0.5mAS; Can use 500～1200 ℃ of TRs.
Embodiment 3:
Ratio dry ball milling mixing 12h according to magnesia powder: silicon dioxide powder=100:2 obtains mixed powder; Then according to mixed powder: the mixed of sticker: softening agent: lubricant=100:5:2.5:1 obtains compound; In vacuum deairing machine, compound and suitable quantity of water (quality of water be mixture quality 20%) are mixed refining mud; Obtain uniform plastic pug, the relative vacuum degree is not less than 50%; Seal old 24 hours; Adopt extruding-out process, can extrude the tubulose base substrate in 3 holes, be cut into length and be about 10cm; Base substrate is 50 ℃ of following thorough dryings.Under air atmosphere, 1050 ℃ of calcinings 8 hours, obtain the Natural manganese dioxide insulation prefabricated pipe rod in 3 holes, its profile is shown in Fig. 1 (b).The specific density of this prefabricated pipe rod is 66%.Its normality insulation resistance is 1005M Ω, withstand voltage>=1800V/0.5mAS; At surface power density is 6W/cm
2The time Leakage Current be 0.057mA, withstand voltage>=1800V/0.5mAS; Can use 500～1200 ℃ of TRs.
Claims (9)
1. a mineral heating cables is with the excellent preparation method of Natural manganese dioxide insulation prefabricated pipe, and it is characterized in that: this method comprises the steps:
(1) batch mixing:
With magnesia powder and silicon dioxide powder according to magnesia powder: silicon dioxide powder=100: the part by weight of (0.5～2) mixes back dry ball milling 4-12h, obtains mixed powder; Then with mixed powder and sticker, softening agent, lubricant according to mixed powder: sticker: softening agent: lubricant=100: (5 ~ 15): (1 ~ 3): the part by weight of (1～2) mixes and obtains compound; In vacuum deairing machine, compound is mixed refining mud with zero(ppm) water; Obtain uniform plastic pug, seal old 24 hours;
(2) moulding:
Adopt extruding-out process to extrude the tubulose base substrate, base substrate descended dry 10-24 hour at 50-80 ℃.
(3) calcining:
Through 1000～1400 ℃ of calcinings 1 ~ 8 hour under air atmosphere of the dried base substrate of step (2), obtain Natural manganese dioxide insulation prefabricated pipe rod.
2. the preparation method of Natural manganese dioxide insulation prefabricated pipe rod according to claim 1, it is characterized in that: the add-on of zero(ppm) water is 5～20% of a compound weight described in the step (1).
3. the preparation method of Natural manganese dioxide insulation prefabricated pipe rod according to claim 1 is characterized in that: the relative vacuum degree is not less than 50% in the middle vacuum deairing machine of step (1).
4. the preparation method of Natural manganese dioxide insulation prefabricated pipe rod according to claim 1 is characterized in that: said magnesia powder purity>=98.0%, ferro element mass content≤0.05%, granularity>=150 orders; Said silicon dioxide powder purity>=99.5%, granularity>=200 orders.
5. the preparation method of Natural manganese dioxide insulation prefabricated pipe rod according to claim 1, it is characterized in that: said sticker is methylcellulose gum, Z 150PH, CMC 99.5 or Vltra tears.
6. the preparation method of Natural manganese dioxide insulation prefabricated pipe rod according to claim 1, it is characterized in that: said softening agent is glycerine, polyoxyethylene glycol or acetate triglycol.
7. the preparation method of Natural manganese dioxide insulation prefabricated pipe rod according to claim 1, it is characterized in that: said lubricant is whiteruss or tung oil.
8. the preparation method of Natural manganese dioxide insulation prefabricated pipe rod according to claim 1; It is characterized in that: in step (2) extruding-out process; Through changing different extruder heads, extrude the tubulose base substrate of different hole counts, the hole count of tubulose base substrate, aperture and pipe range are selected as required.
9. the preparation method of Natural manganese dioxide insulation prefabricated pipe rod according to claim 8, it is characterized in that: said tubulose base substrate is half hole, single hole, 2 holes, 3 holes, 4 holes, 5 holes, 6 holes or 12 holes.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105551693A (en) * | 2016-01-29 | 2016-05-04 | 中国电子科技集团公司第二十三研究所 | Fabrication method of extruded mineral insulated radio-frequency cable and radio-frequency cable |
| CN105565787A (en) * | 2015-12-18 | 2016-05-11 | 重庆材料研究院有限公司 | Composite insulating material for armored signal-transmission cable and preparation method of composite insulating material |
| CN108516804A (en) * | 2018-06-25 | 2018-09-11 | 盐城市华康电热绝缘材料厂 | The preparation method of extrusion type magnesia tube |
| CN108726993A (en) * | 2018-06-05 | 2018-11-02 | 博侃电气（合肥）有限公司 | A kind of preparation method of mineral insulated cable ceramics pole |
| CN108793972A (en) * | 2018-06-05 | 2018-11-13 | 博侃电气（合肥）有限公司 | A kind of preparation method of mineral insulated cable Magnesium oxide knob insulator |
| CN109020503A (en) * | 2018-08-20 | 2018-12-18 | 镇江裕太防爆电加热器有限公司 | A kind of triangle magnesium pipe sintering method |
| CN113184615A (en) * | 2021-04-29 | 2021-07-30 | 华远高科电缆有限公司 | Magnesium oxide insulation copper strip welding sheath power cable |
| CN115974537A (en) * | 2022-11-14 | 2023-04-18 | 连云港市隆泰镁业有限公司 | Method for preparing silicon dioxide tube |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105565787A (en) * | 2015-12-18 | 2016-05-11 | 重庆材料研究院有限公司 | Composite insulating material for armored signal-transmission cable and preparation method of composite insulating material |
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| CN108726993A (en) * | 2018-06-05 | 2018-11-02 | 博侃电气（合肥）有限公司 | A kind of preparation method of mineral insulated cable ceramics pole |
| CN108793972A (en) * | 2018-06-05 | 2018-11-13 | 博侃电气（合肥）有限公司 | A kind of preparation method of mineral insulated cable Magnesium oxide knob insulator |
| CN108726993B (en) * | 2018-06-05 | 2021-08-06 | 博侃电气（合肥）有限公司 | Preparation method of mineral insulated cable ceramic column |
| CN108793972B (en) * | 2018-06-05 | 2021-08-06 | 博侃电气（合肥）有限公司 | Preparation method of mineral insulated cable magnesium oxide knob insulator |
| CN108516804A (en) * | 2018-06-25 | 2018-09-11 | 盐城市华康电热绝缘材料厂 | The preparation method of extrusion type magnesia tube |
| CN109020503A (en) * | 2018-08-20 | 2018-12-18 | 镇江裕太防爆电加热器有限公司 | A kind of triangle magnesium pipe sintering method |
| CN113184615A (en) * | 2021-04-29 | 2021-07-30 | 华远高科电缆有限公司 | Magnesium oxide insulation copper strip welding sheath power cable |
| CN115974537A (en) * | 2022-11-14 | 2023-04-18 | 连云港市隆泰镁业有限公司 | Method for preparing silicon dioxide tube |
| CN115974537B (en) * | 2022-11-14 | 2024-03-22 | 连云港市隆泰镁业有限公司 | Method for preparing silicon dioxide tube |
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