CN111704395A - Magnesium oxide for moisture-proof fireproof cable and preparation method thereof - Google Patents
Magnesium oxide for moisture-proof fireproof cable and preparation method thereof Download PDFInfo
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- CN111704395A CN111704395A CN202010417944.4A CN202010417944A CN111704395A CN 111704395 A CN111704395 A CN 111704395A CN 202010417944 A CN202010417944 A CN 202010417944A CN 111704395 A CN111704395 A CN 111704395A
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- magnesium oxide
- moisture
- fireproof cable
- proof fireproof
- talc
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/30—Compounds having one or more carbon-to-metal or carbon-to-silicon linkages ; Other silicon-containing organic compounds; Boron-organic compounds
- C04B26/32—Compounds having one or more carbon-to-metal or carbon-to-silicon linkages ; Other silicon-containing organic compounds; Boron-organic compounds containing silicon
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F5/00—Compounds of magnesium
- C01F5/02—Magnesia
-
- 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
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/28—Protection against damage caused by moisture, corrosion, chemical attack or weather
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/29—Protection against damage caused by extremes of temperature or by flame
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/28—Fire resistance, i.e. materials resistant to accidental fires or high temperatures
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/90—Electrical properties
- C04B2111/92—Electrically insulating materials
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
- Fireproofing Substances (AREA)
Abstract
The invention provides magnesium oxide for a moisture-proof fireproof cable and a preparation method thereof. The preparation method of the magnesium oxide for the moisture-proof fireproof cable comprises the following steps: mixing magnesium oxide, kaolin talc, aluminum hydroxide and zirconium silicate; preparing high hydrogen-containing organic silicon resin, high hydrogen-containing organic silicon oil, an aluminate coupling agent and solvent oil into a solution; and mixing the materials and the solution, and then baking in a low-temperature rotary furnace to obtain the magnesium oxide for the moisture-proof fireproof cable. The invention also discloses the magnesium oxide for the moisture-proof fireproof cable prepared by the method. The preparation method of the magnesium oxide for the moisture-proof fireproof cable is simple and easy to implement, and the prepared magnesium oxide for the moisture-proof fireproof cable has excellent moisture-proof insulating property, and the insulation is still more than or equal to 1000 MOmega under the conditions that the humidity is 80% RH and the time is 5 hours.
Description
Technical Field
The invention relates to a material technology, in particular to magnesium oxide for a moisture-proof fireproof cable and a preparation method thereof.
Background
The safety of the electrical lines is of critical importance, whether in a factory or in a building. According to the statistics of relevant departments of the country, the fire caused by an electric line accounts for more than 50% of the causes of the fire. The cable is a main body in the circuit and is a link difficult to protect. Therefore, the cable should not only have the capability of resisting the damage of external flame, but also have the characteristic of not generating fire source by itself. Because the mineral insulated cable is made of inorganic materials, the magnesium oxide insulator can not generate open fire when in overload or short circuit. Therefore, the line formed by the mineral insulated cable can never cause fire. If a fire is caused by other reasons, the cable is not only tested by the big fire of the bear but also continuously impacted by other falling objects in the process of burning. At the moment, whether the cable can ensure the normal starting of fire-fighting equipment, the extinguishing of fire and the evacuation of personnel while generating no smoke and toxic gas is the key for evaluating the fire resistance of the line.
At present, under the conditions that the temperature is 25 ℃, the humidity is 80 percent RH and the temperature is 3 hours, the insulation of the insulated cable made of magnesium oxide is reduced from 500M omega to 0.5M omega. And before the cable is manufactured, the raw materials need to be baked at high temperature, so that moisture in the raw materials is removed, and the process difficulty is increased. The maximum normal working high temperature of the cable can reach 250 ℃, and the working time is short when the temperature is more than or equal to 700 ℃.
Disclosure of Invention
The invention aims to provide a moisture-proof magnesium oxide for a fireproof cable, aiming at the problems that the moisture resistance of the cable insulated by the magnesium oxide is poor and the insulation performance is obviously reduced after the cable is wetted, wherein the material has excellent moisture-proof insulation performance, and the insulation is still more than or equal to 1000 MOmega under the conditions that the humidity is 80% RH and the time is 5 hours.
In order to achieve the purpose, the invention adopts the technical scheme that: a preparation method of magnesium oxide for a moisture-proof fireproof cable comprises the following steps:
step 1), removing magnetic substances in the fused magnesia by high-strength electromagnetic separation of the fused magnesia particles;
step 2), treating the fused magnesia particles by a high-temperature rotary furnace at 1100-1200 ℃ for 60-120 minutes, preferably 60-90 minutes, and removing magnetic substances in the magnesia by the obtained fused magnesia particles through high-strength electromagnetic separation;
step 3) placing kaolin into a muffle type rotary kiln, and calcining for 2-4 hours at 700-800 ℃;
step 4), carrying out surface modification treatment on the kaolin subjected to fine classification (adopting an LHB type turbine type airflow classifier for fine classification) calcination by using a surface modifier; obtaining superfine calcined kaolin with d less than or equal to 0.05mm and the content of 90% +/-3%;
step 5) placing the talc in a vertical drier to dry for 1-3 hours at 500-600 ℃; carrying out ultrafine grinding on the talc to 500-1000 meshes;
step 6) baking the aluminum hydroxide powder at 250-350 ℃ for 1-2 hours;
step 7) baking zirconium silicate powder at 750-850 ℃ for 1-3 hours;
step 8), mixing the magnesium oxide, kaolin talc, aluminum hydroxide and zirconium silicate obtained in the step according to the weight ratio of 100: 3-6:2-5:1-3: 10-20;
step 9), mixing the high hydrogen-containing organic silicon resin, the high hydrogen-containing organic silicon oil, the aluminate coupling agent and the solvent oil according to the volume ratio of 3-5: 4-6: preparing the solution according to the ratio of 20-30: 60-80;
step 10) mixing the materials obtained in the step 8) and the solution obtained in the step 9) according to the weight ratio of 80-110: 2-6 to obtain a mixed wet material;
and step 11) drying the mixed wet material in a low-temperature rotary furnace at the temperature of 150-300 ℃ for 1-2 hours to obtain the magnesium oxide for the moisture-proof fireproof cable.
Further, the particle size of the fused magnesia particles in the step 1 is 60-400 meshes, and the fused magnesia particles are prepared by crushing fused magnesia raw materials through a crusher.
Further, the magnetic field intensity of the high-intensity electromagnetic separation in the step 1) is 10000 Gauss-15000 Gauss.
Further, the kaolin d in the step 2) is less than or equal to 20mm, and the kaolin is prepared by crushing and finely grading a kaolin raw material through a jaw crusher. The fine classification is mainly to obtain d less than or equal to 20mm, and an LHB turbine type air flow classifier is adopted for fine classification.
Further, the surface modifier in the step 4) comprises 0.05% of organic silicon resin and 0.1% of solvent oil, and the modification method is a chemical coating method.
Further, the d of the talc in the step 5) is less than or equal to 10mm, and the talc is formed by crushing talc raw materials through a hammer crusher.
Further, the content of acid-insoluble substances in the talc in the step 5) is more than or equal to 93.0 percent, and the acid-soluble iron (Fe)2O3) Less than or equal to 0.20 percent, the ignition loss (1200 ℃) less than or equal to 3.00 percent, the magnet absorption less than or equal to 0.03 percent and the water less than or equal to 0.3 percent.
The invention also discloses magnesium oxide for the moisture-proof fireproof cable, which is prepared by adopting the method.
The invention relates to a magnesium oxide for a moisture-proof fireproof cable, which comprises the following components in parts by weight:
compared with the prior art, the magnesium oxide for the moisture-proof fireproof cable has the following advantages:
1) the magnesium oxide for the moisture-proof fireproof cable can be applied to the field of cables, and the insulation of the cable manufactured by the magnesium oxide for the moisture-proof fireproof cable can still be more than or equal to 1000 MOmega under the conditions of 25 ℃ of temperature, 80% RH of humidity and 5 hours.
2) Before the magnesium oxide for the moisture-proof fireproof cable is used for manufacturing the cable, magnesium powder does not need to be baked, the production process is simplified, and the productivity and the working efficiency are improved.
3) The maximum normal working temperature of the cable manufactured by the magnesium oxide for the moisture-proof fireproof cable can reach 280 ℃, and the cable can continue to operate at the temperature close to the melting point of copper and 1083 ℃ in a short period of time. Maintaining circuit integrity provides valuable time for safe evacuation of personnel.
Detailed Description
The invention is further illustrated by the following examples:
example 1
The embodiment discloses a preparation method of magnesium oxide for a moisture-proof fireproof cable, which comprises the following steps:
1. crushing the fused magnesium oxide to 60-400 meshes by a crusher; the granularity of the electric melting magnesia is in an interval range, the electric melting magnesia cannot be single in mesh number, and the single filling effect is poor.
2. Carrying out high-strength electromagnetic separation on the electrofused magnesium oxide particles to remove magnetic substances in the electrofused magnesium oxide;
3. treating the fused magnesia particles in a high-temperature rotary furnace at 1100-1200 ℃ for 60 minutes, removing magnetic substances in the magnesia from the obtained fused magnesia through high-strength electromagnetic separation, and cooling for later use;
4. crushing a kaolin raw material by a jaw crusher until d is less than or equal to 20 mm; then fine grading is carried out;
5. directly feeding kaolin into a muffle type rotary kiln to be calcined for 2 hours at 700-800 ℃;
6. carrying out surface modification treatment on the kaolin subjected to fine grading calcination by using a surface modification machine; obtaining superfine calcined kaolin with d less than or equal to 0.05mm and the content of 90% +/-3%;
7. crushing the talc raw material by a hammer crusher until d is less than or equal to 10mm, and drying the talc raw material in a vertical dryer at 500-600 ℃;
8. ultrafine grinding pulvis Talci to obtain 500-1000 mesh powder, acid insoluble substance not less than 93.0%, and acid soluble iron (Fe)2O3) Less than or equal to 0.20 percent, the ignition loss (1200 ℃) is less than or equal to 3.00 percent, the magnet absorption is less than or equal to 0.03 percent, and the water content is less than or equal to 0.3 percent;
9. baking the aluminum hydroxide powder at 250-350 ℃ for 1-2 hours;
10. baking zirconium silicate powder at 750-850 ℃ for 1-3 hours;
11. taking the magnesium oxide obtained in the step 3, the kaolin obtained in the step 6, the talc obtained in the step 8, the aluminum hydroxide obtained in the step 9, and the zirconium silicate obtained in the step 10 according to the weight ratio of 100: 3-6:2-5: stirring uniformly in a container according to the proportion of 1-3: 10-20;
12. high-hydrogen-content organic silicon resin, high-hydrogen-content organic silicon oil, an aluminate coupling agent and solvent oil are mixed according to the volume ratio of 3-5: 4-6: preparing the solution according to the ratio of 20-30: 60-80;
13. adding the solution obtained in the step 12 into the container in the step 11, and uniformly stirring;
14. drying the mixed wet material obtained in the step 13 in a low-temperature rotary furnace at the temperature of 150-300 ℃ for 1-2 hours;
the magnesium oxide for the moisture-proof fireproof cable prepared in the embodiment comprises the following components in parts by weight:
finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (8)
1. A preparation method of magnesium oxide for a moisture-proof fireproof cable is characterized by comprising the following steps:
step 1), removing magnetic substances in the fused magnesia by high-strength electromagnetic separation of the fused magnesia particles;
step 2), treating the fused magnesia particles for 60-120 minutes by a high-temperature rotary furnace at 1100-1200 ℃, and removing magnetic substances in the magnesia by high-strength electromagnetic separation;
step 3) placing kaolin into a muffle type rotary kiln, and calcining for 2-4 hours at 700-800 ℃;
step 4), carrying out surface modification treatment on the kaolin subjected to fine grading calcination by using a surface modifier; obtaining superfine calcined kaolin with d less than or equal to 0.05mm and the content of 90% +/-3%;
step 5) placing the talc in a vertical drier to dry for 1-3 hours at 500-600 ℃; carrying out ultrafine grinding on the talc to 500-1000 meshes;
step 6) baking the aluminum hydroxide powder at 250-350 ℃ for 1-2 hours;
step 7) baking zirconium silicate powder at 750-850 ℃ for 1-3 hours;
step 8), mixing the magnesium oxide, kaolin talc, aluminum hydroxide and zirconium silicate obtained in the step according to the weight ratio of 100: 3-6:2-5:1-3: 10-20;
step 9), mixing the high hydrogen-containing organic silicon resin, the high hydrogen-containing organic silicon oil, the aluminate coupling agent and the solvent oil according to the volume ratio of 3-5: 4-6: preparing the solution according to the ratio of 20-30: 60-80;
step 10) mixing the materials obtained in the step 8) and the solution obtained in the step 9) according to the weight ratio of 80-110: 2-6 to obtain a mixed wet material;
and step 11) drying the mixed wet material in a low-temperature rotary furnace at the temperature of 150-300 ℃ for 1-2 hours to obtain the magnesium oxide for the moisture-proof fireproof cable.
2. The method for preparing magnesium oxide for moisture-proof fireproof cables according to claim 1, wherein the fused magnesium oxide particles in step 1 have a particle size of 60-400 meshes and are prepared by crushing a fused magnesium oxide raw material by a crusher.
3. The method for preparing the magnesium oxide for the moisture-proof fireproof cable according to claim 1, wherein the method comprises the following steps: step 1) the magnetic field intensity of the high-intensity electromagnetic separation is 10000 Gauss-15000 Gauss.
4. The preparation method of the magnesium oxide for the moisture-proof fireproof cable according to claim 1, wherein the kaolin clay d in the step 2) is less than or equal to 20mm, and the kaolin clay is obtained by crushing and finely classifying a kaolin clay raw material by a jaw crusher.
5. The method for preparing the magnesium oxide for the moisture-proof fireproof cable according to claim 1, wherein the surface modifier in step 4) comprises 0.05% of silicone resin and 0.1% of solvent oil, and the modification method is a chemical coating method.
6. The method for preparing the magnesium oxide for the moisture-proof fireproof cable according to claim 1, wherein the talc in step 5) has a d of 10mm or less, and the talc is obtained by crushing talc raw materials through a hammer crusher.
7. The preparation method of the magnesium oxide for the moisture-proof fireproof cable according to claim 1, wherein the acid insoluble substances in the talc in the step 5) are not less than 93.0%, the acid soluble iron is not more than 0.20%, the loss on ignition is not more than 3.00%, the magnet absorbate is not more than 0.03%, and the water content is not more than 0.3%.
8. The magnesium oxide for the moisture-proof fireproof cable is characterized by being prepared by the preparation method of the magnesium oxide for the moisture-proof fireproof cable according to any one of claims 1 to 7.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010417944.4A CN111704395A (en) | 2020-05-18 | 2020-05-18 | Magnesium oxide for moisture-proof fireproof cable and preparation method thereof |
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| CN202010417944.4A CN111704395A (en) | 2020-05-18 | 2020-05-18 | Magnesium oxide for moisture-proof fireproof cable and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113583294A (en) * | 2021-07-30 | 2021-11-02 | 大石桥市美尔镁制品有限公司 | High-temperature-resistant high-pressure-resistant moistureproof magnesium oxide for fireproof cable, and preparation method and application thereof |
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| CN113583294A (en) * | 2021-07-30 | 2021-11-02 | 大石桥市美尔镁制品有限公司 | High-temperature-resistant high-pressure-resistant moistureproof magnesium oxide for fireproof cable, and preparation method and application thereof |
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Application publication date: 20200925 |