CN103524120B - A kind of Magnesium oxide knob insulator and preparation method thereof - Google Patents
A kind of Magnesium oxide knob insulator and preparation method thereof Download PDFInfo
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- CN103524120B CN103524120B CN201310347825.6A CN201310347825A CN103524120B CN 103524120 B CN103524120 B CN 103524120B CN 201310347825 A CN201310347825 A CN 201310347825A CN 103524120 B CN103524120 B CN 103524120B
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Abstract
The invention discloses a kind of Magnesium oxide knob insulator and preparation method thereof, is add Mierocrystalline cellulose, paraffin and silicone oil in the magnesia powder more than 300 orders, by granulation, shaping and sintering; Magnesium oxide knob insulator is made up of the component of following weight percent: magnesia powders 80 ~ 96% more than 300 orders; Mierocrystalline cellulose 0.1 ~ 5%; Paraffin 1 ~ 8%; Silicone oil 1.7 ~ 8%.Magnesium oxide knob insulator provided by the invention and preparation method thereof: sintering temperature reduces, be only about 500 DEG C, also shorten the heating-up time simultaneously, reduce energy consumption, improve production efficiency, utilize the Magnesium oxide knob insulator cut cable head moisture absorption length of present method manufacture to be only and foreshorten to 20cm.
Description
Technical field
The present invention relates to a kind of fireproof cable insulation layer and preparation method thereof, particularly relate to a kind of Magnesium oxide knob insulator and the shaping preparation method of low-temperature sintering thereof.
Background technology
Along with the increase year by year of electrical fire incidence in fire generation, therefore increasingly urgent to electric wire fire protection requirement.In the production technique of current mineral fireproof cable, the Magnesium oxide knob insulator manufacture method in the fireproof cable that domestic all manufacturing enterprises adopt, although quality product is relatively stable, the production cycle is long, and sintering temperature high (1200 DEG C), causes production cost high.Under the overall background of energy-saving and emission-reduction, enterprise more and more payes attention to reducing energy consumption, improving manufacture efficiency.
The prefabricated Magnesium oxide knob insulator that current domestic mineral insulated cable magnesium oxide adopts is by high temperature sintering methods, and whole process length consuming time, energy consumption are high, is difficult to the manufacturing cost significantly reducing fireproof cable, improves and manufacture efficiency.
Summary of the invention
For above-mentioned traditional Magnesium oxide knob insulator manufacture craft, Magnesium oxide knob insulator provided by the invention and the shaping preparation method of low-temperature sintering thereof, reduce the energy consumption of Magnesium oxide knob insulator production process to a great extent, also reduce cost simultaneously, shorten the production cycle, improve manufacture efficiency.
A kind of Magnesium oxide knob insulator, is made up of the component of following weight percent:
Preferably, the weight percent of each component is:
The preparation method of Magnesium oxide knob insulator of the present invention, comprises the steps:
A) add Mierocrystalline cellulose, paraffin, silicone oil in the magnesium oxide powder more than 300 orders, carry out granulation, obtain magnesium oxide particle;
B) by step a) in the magnesium oxide particle that obtains be pressed into column type, obtain base substrate;
C) by step b) in the base substrate that obtains sinter at 500 ~ 900 DEG C, obtain Magnesium oxide knob insulator.
Preferably, step concrete operations a) are: drop in tablets press by Mierocrystalline cellulose, paraffin, silicone oil together with magnesium oxide powders more than 300 orders, at 100 ~ 200 DEG C, granulation 1 ~ 2h, obtains magnesium oxide particle.
Preferably, step b) concrete operations be: described magnesium oxide particle is dropped in forming machine, is 10/m 10 ~ 12 atmospheric pressure restrictions, obtains Magnesium oxide knob insulator.
Preferably, described step c) in, the time of sintering is 1 ~ 3h.
Beneficial effect of the present invention is: sintering temperature reduces, and is only about 500 DEG C, also shortens the heating-up time simultaneously, reduces energy consumption, improve production efficiency, utilize the Magnesium oxide knob insulator cut cable head moisture absorption length of present method manufacture to be only and foreshorten to 20cm.
Accompanying drawing explanation
Fig. 1 is Magnesium oxide knob insulator preparation flow schematic diagram of the present invention;
Fig. 2 is each embodiment and sintering temperature of the prior art schematic diagram over time in the present invention.
Embodiment
Below in conjunction with embodiment, the invention will be further described, but protection scope of the present invention is not only confined to embodiment.Magnesia powder used in the present invention is all greater than 300 orders, and preparation flow as shown in Figure 1.
Proportioning raw materials (weight percent) in each embodiment of table 1
| Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Embodiment 5 | |
| Magnesia powder | 80～84 | 82～87 | 85～89 | 90～92 | 92～96 |
| Mierocrystalline cellulose | 2～5 | 2～3 | 1～5 | 2～3 | 0.1～0.3 |
| Paraffin | 2～8 | 4～8 | 2～5 | 1～3 | 2～3.5 |
| Silicone oil | 2～7 | 6～8 | 5～8 | 4～5 | 1.7～4.4 |
Embodiment 1:
A) by the proportioning of embodiment in table 11, add Mierocrystalline cellulose, paraffin, silicone oil in the magnesium oxide powder more than 300 orders, after mixing, drop in tablets press, at 100 DEG C, granulation 2h, obtains magnesium oxide particle, for subsequent use;
B) by step a) in the magnesium oxide particle that obtains drop in the hopper in extrusion machine, be 15/m 10 atmospheric pressure restrictions, obtain column type base substrate;
C) by step b) in the base substrate that obtains at 650 DEG C, sinter 2h, obtain Magnesium oxide knob insulator.
Embodiment 2:
A) by the proportioning of embodiment in table 12, add Mierocrystalline cellulose, paraffin, silicone oil in the magnesium oxide powder more than 300 orders, after mixing, drop in tablets press, at 150 DEG C, granulation 1.5h, obtains magnesium oxide particle, for subsequent use;
B) by step a) in the magnesium oxide particle that obtains drop in the hopper in extrusion machine, be 15/m 12 atmospheric pressure restrictions, obtain column type base substrate;
C) by step b) in the base substrate that obtains at 900 DEG C, sinter 1h, obtain Magnesium oxide knob insulator.
Embodiment 3:
A) by the proportioning of embodiment in table 13, add Mierocrystalline cellulose, paraffin, silicone oil in the magnesium oxide powder more than 300 orders, after mixing, drop in tablets press, at 200 DEG C, granulation 1h, obtains magnesium oxide particle, for subsequent use;
B) by step a) in the magnesium oxide particle that obtains drop in the hopper in extrusion machine, be 15/m 10 atmospheric pressure restrictions, obtain column type base substrate;
C) by step b) in the base substrate that obtains at 800 DEG C, sinter 1.2h, obtain Magnesium oxide knob insulator.
Embodiment 4:
A) by the proportioning of embodiment in table 14, add Mierocrystalline cellulose, paraffin, silicone oil in the magnesium oxide powder more than 300 orders, after mixing, drop in tablets press, at 100 DEG C, granulation 2h, obtains magnesium oxide particle, for subsequent use;
B) by step a) in the magnesium oxide particle that obtains drop in the hopper in extrusion machine, be 15/m 11 atmospheric pressure restrictions, obtain column type base substrate;
C) by step b) in the base substrate that obtains at 600 DEG C, sinter 2.5h, obtain Magnesium oxide knob insulator.
Embodiment 5:
A) by the proportioning of embodiment in table 15, add Mierocrystalline cellulose, paraffin, silicone oil in the magnesium oxide powder more than 300 orders, after mixing, drop in tablets press, at 200 DEG C, granulation 1.5h, obtains magnesium oxide particle, for subsequent use;
B) by step a) in the magnesium oxide particle that obtains drop in the hopper in extrusion machine, be 15/m 12 atmospheric pressure restrictions, obtain column type base substrate;
C) by step b) in the base substrate that obtains at 500 DEG C, sinter 3h, obtain Magnesium oxide knob insulator.
Comparative example 1
To the temperature lower calcination 3h of material oxidation magnesium at 1200 DEG C, obtain the light calcined magnesia that purity is greater than 90%, be respectively particle diameter and be greater than 150 orders and 80 ~ 150 object light calcined magnesias, particle diameter is greater than 150 orders and the mixing of 80 ~ 150 object light calcined magnesias, obtain mineral insulated cable porcelain knob magnesium oxide, by binding agent according to mineral insulated cable porcelain knob with 2.5% of magnesian quality ratio be dissolved in specific conductivity not higher than in the water of 20, and mix with described mineral insulated cable porcelain knob magnesium oxide, obtain magnesium oxide particle, the humid control of magnesium oxide particle is 13%, magnesium oxide particle is suppressed under the pressure of 9 atmospheric pressures, obtains porcelain knob, cool after described Magnesium oxide knob insulator is calcined 3h at 750 DEG C, obtain Magnesium oxide knob insulator, sintering temperature is illustrated as shown in Figure 2 over time.
Last it is noted that above embodiment only in order to illustrate the present invention and and unrestricted technical scheme described in the invention; Therefore, although this specification sheets with reference to each above-mentioned embodiment to present invention has been detailed description, those of ordinary skill in the art should be appreciated that and still can modify to the present invention or equivalent to replace; And all do not depart from technical scheme and the improvement thereof of the spirit and scope of the present invention, it all should be encompassed in right of the present invention.
Claims (2)
1. a preparation method for Magnesium oxide knob insulator, is characterized in that, described Magnesium oxide knob insulator is made up of the component of following weight percent: magnesia powders 80 ~ 96% more than 300 orders; Mierocrystalline cellulose 0.1 ~ 5%; Paraffin 1 ~ 8%; Silicone oil 1.7 ~ 8%, described preparation method comprises the steps:
A) add Mierocrystalline cellulose, paraffin, silicone oil in the magnesium oxide powder more than 300 orders, carry out granulation, obtain magnesium oxide particle;
B) by step a) in the magnesium oxide particle that obtains be pressed into column type, obtain base substrate;
C) by step b) in the base substrate that obtains at 500 ~ 900 DEG C, carry out sintering 1 ~ 3h, obtain Magnesium oxide knob insulator;
Step concrete operations a) are: drop in tablets press by Mierocrystalline cellulose, paraffin, silicone oil together with magnesium oxide powders more than 300 orders, at 100 ~ 200 DEG C, granulation 1 ~ 2h, obtains magnesium oxide particle;
Step b) concrete operations be: described magnesium oxide particle is dropped in forming machine, is made as 15/m at 10 ~ 12 atmospheric pressure, obtains Magnesium oxide knob insulator.
2. the preparation method of Magnesium oxide knob insulator according to claim 1, is characterized in that, the weight percent of each component is:
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Inventor after: Dai Weiguo Inventor after: Wang Jianzhong Inventor after: Zhu Lvou Inventor after: Wang Baoliang Inventor after: Chen Xiangxiang Inventor after: Zhang Xiaobing Inventor before: Dai Weiguo Inventor before: Wang Jianzhong Inventor before: Zhu Lvou Inventor before: Wang Baoliang |
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