CN117038154A - Mica slurry, heat-insulating mica tube, and preparation method and application thereof - Google Patents
Mica slurry, heat-insulating mica tube, and preparation method and application thereof Download PDFInfo
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- CN117038154A CN117038154A CN202311143731.7A CN202311143731A CN117038154A CN 117038154 A CN117038154 A CN 117038154A CN 202311143731 A CN202311143731 A CN 202311143731A CN 117038154 A CN117038154 A CN 117038154A
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- 239000010445 mica Substances 0.000 title claims abstract description 139
- 229910052618 mica group Inorganic materials 0.000 title claims abstract description 139
- 238000002360 preparation method Methods 0.000 title claims abstract description 65
- 239000002002 slurry Substances 0.000 title claims abstract description 55
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 50
- 229920001903 high density polyethylene Polymers 0.000 claims abstract description 42
- 239000004700 high-density polyethylene Substances 0.000 claims abstract description 42
- 239000000843 powder Substances 0.000 claims abstract description 26
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 19
- 239000000741 silica gel Substances 0.000 claims abstract description 12
- 229910002027 silica gel Inorganic materials 0.000 claims abstract description 12
- 239000004594 Masterbatch (MB) Substances 0.000 claims abstract description 10
- 238000001035 drying Methods 0.000 claims description 27
- 238000001816 cooling Methods 0.000 claims description 20
- 238000001125 extrusion Methods 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 10
- 239000002245 particle Substances 0.000 claims description 8
- 239000011810 insulating material Substances 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 229920001296 polysiloxane Polymers 0.000 claims description 3
- 229910021487 silica fume Inorganic materials 0.000 claims description 3
- 239000011247 coating layer Substances 0.000 claims 1
- 230000009970 fire resistant effect Effects 0.000 claims 1
- 238000009413 insulation Methods 0.000 abstract description 33
- 239000000463 material Substances 0.000 abstract description 9
- 230000000052 comparative effect Effects 0.000 description 20
- 239000002994 raw material Substances 0.000 description 16
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 9
- 229910052710 silicon Inorganic materials 0.000 description 9
- 239000010703 silicon Substances 0.000 description 9
- 238000003756 stirring Methods 0.000 description 6
- 229920002050 silicone resin Polymers 0.000 description 5
- 230000007547 defect Effects 0.000 description 4
- 238000001514 detection method Methods 0.000 description 4
- 238000012216 screening Methods 0.000 description 4
- -1 and meanwhile Substances 0.000 description 3
- 239000000499 gel Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 229920001131 Pulp (paper) Polymers 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000002468 ceramisation Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
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- 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
- H01B3/04—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances mica
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B17/00—Insulators or insulating bodies characterised by their form
- H01B17/56—Insulating bodies
- H01B17/58—Tubes, sleeves, beads, or bobbins through which the conductor passes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B17/00—Insulators or insulating bodies characterised by their form
- H01B17/56—Insulating bodies
- H01B17/58—Tubes, sleeves, beads, or bobbins through which the conductor passes
- H01B17/583—Grommets; Bushings
-
- 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
-
- 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
- H01B3/025—Other inorganic material
-
- 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
- H01B3/08—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances quartz; glass; glass wool; slag wool; vitreous enamels
-
- 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
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/28—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances natural or synthetic rubbers
-
- 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
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
- H01B3/44—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins
- H01B3/441—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins from alkenes
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Inorganic Insulating Materials (AREA)
Abstract
The application relates to the technical field of mica materials, and particularly discloses mica slurry, a heat-insulating mica tube, a preparation method and application thereof. The mica slurry disclosed by the application comprises the following components in parts by weight: 75-85 parts of cloud master batch, 35-55 parts of high-density polyethylene, 45-55 parts of silica powder and 25-35 parts of organic silica gel; the high-density polyethylene is selected from one or more of HDPE 8100M, HDPE 3300J, HDPE 5200S. The application also discloses a heat-insulating mica tube prepared from the mica slurry and application thereof. The heat-insulating mica tube prepared by the mica slurry disclosed by the application has excellent apparent characteristics, and has excellent normal voltage resistance, fire resistance and heat insulation performance.
Description
Technical Field
The application relates to the technical field of mica materials, in particular to mica slurry, a heat-insulating mica tube, a preparation method and application thereof.
Background
The mica material has high electrical strength, low dielectric loss and high surface resistance and volume resistance, and is widely used as an insulating material in cables and large-scale electromechanical equipment.
Along with the integrated development of large-scale motors, the main insulation structure of the motor is developed towards thinner and more advanced directions, the insulation thinning is favorable for the increase of the single-machine capacity of the motor, the manufacturing cost of windings is reduced, the market competitiveness of high-voltage motor products is improved, the thickness of the insulation structure is reduced, and higher requirements are put forward on the size and physical and chemical properties of mica tube materials.
Mica paper is mainly used for rolling mica pipes in the current market. And the mica material has poor ceramization effect after high temperature, and the mica is a semi-heat-insulating material, so that the heat insulation performance of the prepared mica tube is poor. Therefore, a new preparation method is needed to solve the above problems.
Disclosure of Invention
In order to improve the heat insulation performance of the mica tube, the application provides mica slurry, the heat insulation mica tube, and a preparation method and application thereof.
In a first aspect, the application provides a mica slurry, which comprises the following components in parts by weight: 75-85 parts of cloud master batch, 35-55 parts of high-density polyethylene, 45-55 parts of silica powder and 25-35 parts of organic silica gel; the high-density polyethylene is selected from one or more of HDPE 8100M, HDPE 3300J, HDPE 5200S.
According to the application, the cloud master batch, the high-density polyethylene, the silicon micro powder and the organic silicon with a specific weight ratio are used as raw materials for preparing the mica slurry, and the mica slurry is extruded, dried, cooled and coated to prepare the heat-insulating mica tube sample, so that the surface of the heat-insulating mica tube sample has no defects, and the heat-insulating mica tube sample has excellent voltage resistance, fire resistance and heat insulation performance.
Mica has better high-temperature resistance and insulation; the high-density polyethylene has good heat resistance, cold resistance, chemical stability, higher rigidity and toughness, and good mechanical strength, and can increase the toughness of a mica tube system. The silica micropowder can fill the pores among fine particles of the mica slurry, and meanwhile, gel is formed with hydration products in the mica slurry, so that the viscosity and toughness of the system are improved. The organosilicon has a very flexible main chain, weak intermolecular acting force, proper viscosity, weak surface tension, small surface energy and strong film forming capability, so that the apparent structure of the mica tube after being molded is good.
Inorganic materials and organic substances in the mica paper pulp can well enter gaps of a mica material structure, and the high-temperature insulation performance of the mica tube is improved through interaction; the mica slurry can reduce the thickness of the mica tube, improve the performance structure of the mica tube and the high-temperature insulation performance of the mica tube, and finally obtain the mica tube with thin thickness, light weight, good high-temperature insulation performance and excellent heat insulation performance.
According to the application, the types of the high-density polyethylene in the mica slurry are selected as the types, so that the synergistic effect of the high-density polyethylene and other four raw materials can be optimized, and the voltage resistance, fire resistance and heat insulation performance of the heat insulation mica tube are further improved.
Preferably, the composition comprises the following components in parts by weight: 78-82 parts of cloud master batch, 38-46 parts of high-density polyethylene, 47-53 parts of silica powder and 28-32 parts of organic silica gel.
Further, the composition comprises the following components in parts by weight: 80 parts of cloud master batch, 40 parts of high-density polyethylene, 50 parts of silica powder and 30 parts of organic silica gel.
Preferably, the granularity of the silicon micropowder is 200-1500 meshes.
Further, the granularity of the silicon micropowder is 600-1250 meshes.
In a specific embodiment, the particle size of the fine silica powder may be 200 mesh, 600 mesh, 800 mesh, 1250 mesh, 1500 mesh.
In some specific embodiments, the particle size of the silica fume may also be 200-600 mesh, 200-800 mesh, 200-1250 mesh, 600-800 mesh, 600-1500 mesh, 800-1250 mesh, 800-1500 mesh, 1250-1500 mesh.
As shown by experimental analysis, the granularity of the silicon micropowder is controlled within the range, so that the voltage resistance and the heat insulation performance of the heat insulation mica tube can be further improved.
The preparation method of the mica slurry specifically comprises the following steps: mixing the raw materials according to the weight ratio, and stirring at a speed of not less than 600rpm for not less than 100min to obtain the mica slurry.
In the preparation process of the mica slurry, when the stirring speed is lower than 600rpm or the stirring time is lower than 100min, the treatment uniformity is poor, the added material cannot be uniformly stirred, and the prepared product has unstable performance; according to the application, the stirring speed and stirring time in the mica slurry preparation process are optimized, and the obtained mica slurry is excellent in uniformity, so that the subsequent preparation of the heat-insulating mica tube is facilitated.
In a second aspect, the application provides a heat-insulating mica tube prepared from the mica slurry.
Preferably, the silicone resin is selected from one or more of hydroxy silicone resin RY-JJ-03, vinyl phenyl silicone resin RY-BJG-04, phenyl hydrogen-containing silicone resin RY-BJG-02, methyl silicone resin RY-ZNJ 01.
In a third aspect, the application provides a method for preparing the heat-insulating mica tube, which specifically comprises the following steps:
and extruding, drying and cooling the mica slurry in sequence to obtain the heat-insulating mica tube.
Preferably, the conditions of the extrusion are: the temperature is 170-190 ℃;
the drying is double-section drying, and the specific steps are as follows: double-stage drying, wherein the temperature of one stage is 80-100 ℃, and the drying time is more than or equal to 8min; the second stage temperature is 150-170 ℃, and the drying time is more than or equal to 10min;
the cooling conditions are as follows: the air cooling temperature is 20-30 ℃, and the cooling time is more than or equal to 20min.
Preferably, the thickness of the coating is 80.+ -.10. Mu.m.
The inventors of the present application found during the test that: the process parameters of extrusion, drying and cooling have obvious influence on the production and molding of the heat-insulating mica tube.
In the process of preparing the heat-insulating mica tube, in the extrusion step, when the extrusion temperature is higher than 190 ℃, the surface is in a material shortage state; the extrusion temperature is lower than 170 ℃, and the curing and the forming can not be carried out. In the drying step, the first-stage drying temperature is higher than 100 ℃, and bubbles appear; the first section of drying temperature is lower than 80 ℃, and the heat-insulating mica tube is deformed; the drying time is less than 8 minutes, and the curing and forming can not be performed; the second-stage drying temperature is higher than 170 ℃, and bubbles appear; the second-stage drying temperature is lower than 150 ℃ and cannot be solidified and formed; the drying time is less than 10min, and the curing and forming can not be performed. In the cooling step, the air cooling temperature is higher than 30 ℃, and cracks appear in the heat-insulating mica tube; the air cooling temperature is lower than 20 ℃, and the heat-insulating mica tube deforms; the cooling time is less than 20min, and the heat-insulating mica tube is deformed. If a water cooling mode is adopted, the mica in the heat-insulating mica tube is affected with damp and disintegrated, and the heat-insulating mica tube is deformed.
The application controls the technological parameters of extrusion, drying and cooling to the parameters, can ensure the normal molding of the heat-insulating mica tube, and simultaneously ensures that the surface of the heat-insulating mica tube is free from defects, powder falling, cracks and the like.
In a fourth aspect, the application provides an application of the mica slurry or the heat-insulating mica tube in preparing a fireproof heat-insulating material.
In summary, the technical scheme of the application has the following effects:
according to the application, the cloud master batch, the high-density polyethylene, the silicon micro powder and the organic silicon with a specific weight ratio are used as raw materials for preparing the mica slurry, and the surface of the prepared heat-insulating mica tube sample is defect-free, and has excellent voltage resistance, fire resistance and heat insulation performance.
The preparation method of the heat-insulating mica tube is simple to operate, reduces the production cost, and avoids the adverse phenomena of fracture, powder falling, cracking and the like in the forming process of the heat-insulating mica tube by controlling specific technological parameters of extrusion, drying and cooling.
The application further improves the heat insulation performance of the heat insulation mica tube by screening the types of high-density polyethylene, the granularity of the silica micropowder and the types of the organic silica gel in the mica slurry.
Drawings
Fig. 1 is a process flow chart of a preparation method of a heat insulation mica tube in an embodiment of the application.
Detailed Description
The present application is described in further detail below in conjunction with examples, comparative examples and performance test experiments, which should not be construed as limiting the scope of the application as claimed.
Preparation example
Preparation example 1
The preparation example provides a mica slurry.
The composition of the mica slurry in this preparation example is:
80g of mica (KJZB 01, available from Dongguan Kang Jin New Material technology Co., ltd.), 40g of high-density polyethylene (HDPE 8100M, available from Yanshan petrochemical industry), 50g of silica powder (particle size 800 mesh, available from Hebei Kokai building materials Co., ltd.) and 35g of organic silica gel (SH-9501, available from Hubei New four-sea chemical Co., ltd.) were mixed.
The preparation method of the mica slurry in the preparation example comprises the following steps: the above-mentioned raw materials are mixed according to the above-mentioned weight ratio, then mixed and stirred under the condition of 600rpm and stirring time of 100min so as to obtain the invented mica slurry.
PREPARATION EXAMPLES 2 to 11
Preparation examples 2 to 11 differ from preparation example 1 in that: the amounts of the components in the mica slurry are different and are shown in Table 1.
The other raw materials of the preparation example, the use amounts of the raw materials and the preparation method of the mica slurry are the same as those of the preparation example 1.
TABLE 1 amounts of the components in the mica slurry of preparation examples 1 to 11
Preparation examples 12 to 15
Preparation examples 12-15 each provided a mica slurry.
The above preparation example differs from preparation example 1 in that: the granularity of the silicon micropowder is different, and specifically comprises the following steps:
in preparation example 12: the particle size of the fine silica powder was 200 mesh (available from Asahi building materials Co., ltd.).
In preparation example 13: the particle size of the fine silica powder was 600 mesh (available from Asahi building materials Co., ltd.).
In preparation example 14: the particle size of the fine silica powder was 1250 mesh (available from Asahi building materials Co., ltd., hebeike).
In preparation example 15: the particle size of the fine silica powder was 1500 mesh (available from Asahi building materials Co., ltd., hebeike).
The other raw materials of the preparation example, the use amounts of the raw materials and the preparation method of the mica slurry are the same as those of the preparation example 1.
Preparation examples 16 to 17
Preparation examples 16-17 each provided a mica slurry.
The above preparation example differs from preparation example 1 in that: the high density polyethylene is different in kind, specifically:
in preparation example 16: HDPE 3300J is substituted for HDPE 8100M as high density polyethylene.
In preparation example 17: HDPE 5200S is used as the high-density polyethylene instead of HDPE 8100M.
The other raw materials of the preparation example, the use amounts of the raw materials and the preparation method of the mica slurry are the same as those of the preparation example 1.
Preparation example 18-19
Preparation examples 18-19 each provided a mica slurry.
The above preparation example differs from preparation example 1 specifically in that: the types of the organic silica gel are different, and specifically:
in preparation example 18: SH-9602 (available from Hubei New Sihai chemical Co., ltd.) was used instead of SH-9501 as the silicone gel.
In preparation example 19: SH-5202S (available from Hubei New Sihai chemical Co., ltd.) was used instead of SH-9501 as the silicone gel.
PREPARATION EXAMPLES 20 to 22
Preparation examples 20-22 each provided a mica slurry.
The above preparation example differs from preparation example 1 specifically in that:
in preparation example 20: ceramic powder (800 mesh, available from middle-Anter nanotechnology Co., ltd.) was used instead of the fine silica powder.
In preparation example 21: glass frit (800 mesh, available from middle-amp nanotechnology limited) was used instead of the silica fume.
In preparation example 22: SH800U high density polyethylene (available from Yangshan petrochemical industry) was used in place of HDPE 8100M high density polyethylene.
The other raw materials of the preparation example, the use amounts of the raw materials and the preparation method of the mica slurry are the same as those of the preparation example 1.
Examples
Examples 1 to 11
Examples 1-11 provide an insulated mica tube, respectively.
The above-described embodiments differ in that: the sources of the mica slurries were varied and are shown in Table 2.
The process flow chart of the preparation method of the heat insulation mica tube in the embodiment is shown in fig. 1, and the specific steps are as follows:
sequentially extruding, drying and cooling mica slurry through an extrusion die to obtain a heat-insulating mica tube with the inner diameter of 15+/-0.5 mm and the tube thickness of 5+/-0.05 mm;
the extrusion step conditions are as follows: the extrusion temperature is 180 ℃;
the drying step is double-section drying, and specifically comprises the following steps: the first stage temperature is 90 ℃, the drying time is 8min, the second stage temperature is 160 ℃, and the drying time is 10min;
the cooling step is specifically as follows: the air cooling temperature is 25 ℃, and the cooling time is 20min.
TABLE 2 Source of mica pulp in examples 1-11
Comparative example
Comparative examples 1 to 11
Comparative examples 1-11 each provide a mica tube.
The above comparative example is different from example 1 in that: the sources of the mica slurries were varied and are shown in Table 3. The above comparative example was the same as the preparation method of the mica tube in example 1.
TABLE 3 Source of mica slurries in comparative examples 1-11
Comparative example 12
This comparative example provides a mica tube.
The mica pipes in this comparative example were from the power plant limited company of the upper department of Yangzhou.
Performance test
(1) Appearance characteristics: and observing whether the surface of the prepared product is smooth, and whether powder, cracks, bubbles, pits and the like exist in the preparation process of the heat-insulating mica tube.
(2) Normal voltage resistance: the normal voltage resistance of the cable is detected by a test method according to the section 2 of national standard GB/T5019.2-2009 insulating material based on mica, and the normal voltage resistance can reflect the insulating property of the cable.
(3) Fire resistance: the fire resistance of the insulated mica tube was examined by the method specified in GBT 19216.11-2003.
(5) Heat insulation: referring to the test method of GB/T25352-2010 heat-insulating and sound-insulating material burn-through-resistant test method, flame at 1000 ℃ is used for burning one side of a heat-insulating mica tube, and the temperature of the other side is detected.
Detection result: as shown in table 4.
TABLE 4 results of Performance test of heat insulating mica pipes in examples 1 to 11 and comparative examples 1 to 12
By combining table 5, it is apparent from the properties of the insulating mica pipes of comparative examples 1 to 11 and comparative examples 1 to 12 that the present application uses specific parts by weight of the cloud master batch, high density polyethylene, fine silica powder, and organic silica gel as raw materials for preparing mica slurry, and the surface of the prepared insulating mica pipe is free from defects, and is excellent in withstand voltage, fire resistance, and heat insulation.
From the detection results of comparative examples 1 to 3 and comparative examples 1 to 8, it is known that the addition ratio of each raw material in the mica slurry has a great influence on the extrusion molding of the subsequent heat-insulating mica tube, the apparent characteristics of the sample and the performance of the heat-insulating mica tube; when the proportion of the raw materials is too large or too small, the defects of cracking, powder falling or fracture and the like easily occur in the extrusion molding process of the heat-insulating mica tube, and the prepared heat-insulating mica tube is poor in normal voltage resistance, fire resistance and heat insulation.
From the test results of comparative example 1 and comparative examples 9 to 10, it is understood that when ceramic powder or glass powder is selected to be used instead of the fine silica powder in mica slurry, the normal withstand voltage, fire resistance and heat insulation property of the heat-insulating mica tube are poor; the application selects the silicon micro powder to be added into the mica slurry, and the prepared heat-insulating mica tube has excellent normal voltage resistance, fire resistance and heat insulation. Further, according to the detection results of comparative examples 1 and 4 to 7, the application can further improve the fire resistance and the heat insulation of the heat insulation mica tube by screening the granularity of the silica micropowder to 600 to 1250 meshes.
The present application can further improve the fire resistance and heat insulation of the heat insulation mica pipes by screening one or more of the high density polyethylene type numbers HDPE 8100M, HDPE 3300J, HDPE 5200S according to the test results of comparative examples 1, 8-9 and 11.
According to the detection results of comparative examples 1 and 10-11, the voltage resistance and the heat insulation performance of the heat insulation mica tube are further improved by screening the type of the organic silica gel as SH-9501.
While the application has been described in detail in the foregoing general description and with reference to specific embodiments thereof, it will be apparent to one skilled in the art that modifications and improvements can be made thereto. Accordingly, such modifications or improvements may be made without departing from the spirit of the application and are intended to be within the scope of the application as claimed.
Claims (10)
1. The mica slurry is characterized by comprising the following components in parts by weight: 75-85 parts of cloud master batch, 35-55 parts of high-density polyethylene, 45-55 parts of silica powder and 25-35 parts of organic silica gel; the high-density polyethylene is selected from one or more of HDPE 8100M, HDPE 3300J, HDPE 5200S.
2. The mica slurry according to claim 1, comprising the following components in parts by weight: 78-82 parts of cloud master batch, 38-46 parts of high-density polyethylene, 47-53 parts of silica powder and 28-32 parts of organic silica gel.
3. The mica slurry according to claim 1, comprising the following components in parts by weight: 80 parts of cloud master batch, 40 parts of high-density polyethylene, 50 parts of silica powder and 30 parts of organic silica gel.
4. The mica slurry according to claim 1, wherein the silica fume has a particle size of 200-1500 mesh.
5. The mica slurry according to claim 1, wherein the silicone gum is selected from one or more of SH-9501, SH-9602, SH-5202S.
6. A heat insulating mica pipe prepared from the mica slurry of any one of claims 1-5.
7. The method for preparing the heat-insulating mica tube as claimed in claim 6, comprising the following steps:
and extruding, drying and cooling the mica slurry in sequence to obtain the heat-insulating mica tube.
8. The method for producing an insulated mica tube according to claim 7, wherein the extrusion conditions are: the temperature is 170-190 ℃;
the drying is double-section drying, and the specific steps are as follows: double-stage drying, wherein the temperature of one stage is 80-100 ℃, and the drying time is more than or equal to 8min; the second stage temperature is 150-170 ℃, and the drying time is more than or equal to 10min;
the cooling conditions are as follows: the air cooling temperature is 20-30 ℃, and the cooling time is more than or equal to 20min.
9. The method of producing a heat insulating mica pipe according to claim 7, wherein the thickness of the coating layer is 80±10 μm.
10. Use of a mica slurry according to any one of claims 1 to 5 or a heat insulating mica pipe according to claim 6 for the preparation of a fire resistant insulating heat insulating material.
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