CN110577695A - material formula and manufacturing process of flame-retardant high-polymer heat-shrinkable high-voltage insulating sleeve - Google Patents
material formula and manufacturing process of flame-retardant high-polymer heat-shrinkable high-voltage insulating sleeve Download PDFInfo
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Abstract
the invention discloses a material formula of a flame-retardant high-molecular heat-shrinkable high-voltage insulating sleeve, which comprises the following components in parts by weight: 18-36 parts of ethylene-vinyl acetate copolymer (EVA), 3-6 parts of Polyethylene (PE), 3-6 parts of POE, 4-8 parts of ethylene propylene diene monomer, 16-28 parts of magnesium hydroxide, 4-8 parts of decabromodiphenylethane, 1.5-3 parts of antimony trioxide, 0.5-1 part of composite antioxidant, 0.4-0.8 part of hard zinc release agent, 0.3-0.6 part of special polyethylene wax, 0.5-1.0 part of white oil and 1.5-3 parts of color master batch. The manufacturing process comprises mixing to obtain raw material master batch; preparing an original pipe; performing irradiation crosslinking; expanding and then cooling and shaping. The flame-retardant high-molecular heat-shrinkable high-voltage insulating sleeve has excellent insulating and protecting performance and excellent heat-shrinkable performance, and achieves the effects of energy conservation and environmental protection. The flame-retardant high-molecular heat-shrinkable high-voltage insulating sleeve has excellent flame-retardant performance, and is widely applied to high-voltage power distribution stations, high-voltage power distribution cabinets and high-voltage bus laying insulation protection.
Description
Technical Field
The invention belongs to the technical field of high polymer heat-shrinkable materials, and particularly relates to a material formula of a flame-retardant heat-shrinkable high-voltage insulating sleeve and a manufacturing process thereof.
Background
The high-molecular heat-shrinkable high-voltage insulating sleeve is a new high-tech product, has good physical and chemical properties and is corrosion-resistant, a high-new material is provided for projects such as high-voltage transformer substations, high-voltage power distribution cabinets and high-voltage copper bar laying, and the high-voltage transformer substations, the high-voltage power distribution cabinets and the high-voltage copper bar insulation field are widely applied. Research tests show that the surface temperature of the bus bar can reach 150 ℃ at the highest in the peak of power utilization, so that a fire is easy to occur, and in addition, the fire caused by the fault of high-voltage power distribution occurs at the moment, so inestimable property loss and great potential safety hazard are caused slightly, and personal safety accidents are caused seriously. Therefore, the invention discloses a material formula of a flame-retardant high-molecular heat-shrinkable high-voltage insulating sleeve and a manufacturing process thereof.
The flame retardant grade of the plastic is gradually increased from HB, V-2, V-1 to V-0:
1. HB: the lowest flame retardant rating in the UL94 standard. Requiring a burn rate of less than 40 mm per minute for samples 3 to 13 mm thick; a sample less than 3 mm thick with a burning rate less than 70 mm per minute; or extinguished before the 100 mm mark.
2. V-2: after two 10 second burn tests on the samples, the flame extinguished within 60 seconds. There may be combustion products falling.
3. v-1: after two 10 second burn tests on the samples, the flame extinguished within 60 seconds. No combustible material can fall off.
4. V-0: after two 10 second burn tests on the samples, the flame extinguished within 30 seconds. No combustible material can fall off.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at the technical problem that a fire disaster is easily caused by the faults of a high-voltage transformer substation, a high-voltage power distribution cabinet and a high-voltage copper bar, the material formula and the manufacturing process of the combustion flame-retardant high-polymer heat-shrinkable high-voltage insulating sleeve are provided.
in order to solve the technical problems, the invention is realized by the following technical scheme: the material formula of the flame-retardant high-polymer heat-shrinkable high-voltage insulating sleeve comprises the following components in parts by weight: 18-36 parts of ethylene-vinyl acetate copolymer (EVA), 3-6 parts of Polyethylene (PE), 3-6 parts of POE, 4-8 parts of ethylene propylene diene monomer, 16-28 parts of magnesium hydroxide, 4-8 parts of decabromodiphenylethane, 1.5-3 parts of antimony trioxide, 0.5-1 part of composite antioxidant, 0.4-0.8 part of hard zinc release agent, 0.3-0.6 part of special polyethylene wax, 0.5-1.0 part of white oil and 1.5-3 parts of color master batch.
Preferably, the ethylene-vinyl acetate copolymer (EVA) is preferably V5110J va 18-3.
Preferably, the POE is a thermoplastic elastomer that achieves in situ polymerization of ethylene and octene using a metallocene catalyst.
Preferably, the polyethylene is High Density Polyethylene (HDPE).
Preferably, the preferred type of the ethylene propylene diene monomer is 4725P.
Preferably, the white oil is one of epoxidized soybean oil and dioctyl terephthalate.
A process for manufacturing a flame-retardant high-molecular heat-shrinkable high-voltage insulating sleeve comprises the following steps,
s1, according to the material formula of the flame-retardant high-molecular heat-shrinkable low-voltage insulating sleeve, sequentially putting ethylene-vinyl acetate copolymer (EVA), Polyethylene (PE), POE, ethylene propylene diene monomer, magnesium hydroxide, decabromodiphenylethane, antimony trioxide, a composite antioxidant, a hard zinc release agent, special polyethylene wax, white oil and color master batch into a special high-speed mixer for plastic cement, mixing and dissolving for 5-8 minutes at a high speed, in the mixing process, the mixer does not need to be heated, then the mixed materials are put into a hopper of a special double-screw high-speed granulator, are extruded and drawn at the temperature range of 125-160 ℃ through the special double-screw high-speed granulator after forced feeding, then the mixture enters a water tank for cooling, the water on the surface of the mixture is removed by two plastic blow-drying machines after the mixture is discharged from the water tank, and then the mixture is granulated by a special granulator to obtain raw material master batches;
S2, extruding the master batch prepared in the step S1 by using a single-screw extruder special for PE materials with an automatic feeding and drying device at the temperature range of 115-150 ℃ to obtain an original pipe of the flame-retardant high-polymer heat-shrinkable low-voltage insulating sleeve;
s3, subjecting the original pipe of the flame-retardant high-molecular heat-shrinkable low-voltage insulating sleeve prepared in the step S2 to irradiation crosslinking through a high-molecular electron accelerator, wherein the irradiation dose is 6-12 Mrad;
S4, carrying out vacuum external pressure expansion on the original pipe irradiated in the step S3 by 2-4 times by using a high-speed vertical electromagnetic heating expander within the temperature range of 105-160 ℃, and then cooling and shaping the outside to obtain the flame-retardant high-polymer heat-shrinkable low-voltage insulating sleeve.
Compared with the prior art, the invention has the advantages that:
1. The flame-retardant high-molecular heat-shrinkable high-voltage insulating sleeve has excellent insulating and protecting performance and excellent heat-shrinkable performance, starts to shrink at the temperature higher than 100 ℃ when being shrunk, can quickly reach the heat-shrinkable index, and reduces the operation difficulty during installation. And achieves the effects of energy conservation and environmental protection.
2. The flame-retardant high-molecular heat-shrinkable high-voltage insulating sleeve has excellent flame-retardant performance, and can reach the standard of V0 grade according to the registration test of UL94 when a combustion experiment is carried out on the flame-retardant high-molecular heat-shrinkable high-voltage insulating sleeve. The high-voltage bus bar is widely applied to high-voltage power distribution stations, high-voltage power distribution cabinets and high-voltage bus bars for laying insulation protection.
The specific implementation mode is as follows:
the present invention will be described in detail with reference to specific embodiments below:
The material formula of the flame-retardant high-polymer heat-shrinkable high-voltage insulating sleeve comprises the following components in parts by weight: 18-36 parts of ethylene-vinyl acetate copolymer (EVA), 3-6 parts of Polyethylene (PE), 3-6 parts of POE, 4-8 parts of ethylene propylene diene monomer, 16-28 parts of magnesium hydroxide, 4-8 parts of decabromodiphenylethane, 1.5-3 parts of antimony trioxide, 0.5-1 part of composite antioxidant, 0.4-0.8 part of hard zinc release agent, 0.3-0.6 part of special polyethylene wax, 0.5-1.0 part of white oil and 1.5-3 parts of color master batch.
the ethylene vinyl acetate copolymer (EVA) is preferably V5110J va18-3, of formula: (C2H 4) x (C4H 6O 2) y; molecular weight: 342.43, respectively; CAS No.: 24937-78-81; melting point: boiling point at 75 ℃: 170.6 ℃; relative density: 0.948g/mL (25 ℃); flash point: at 260 ℃.
The POE is a thermoplastic elastomer which adopts metallocene catalyst to realize in-situ polymerization of ethylene and octene, and is characterized in that: (1) the soft chain coil structure of octene and the crystalline ethylene chain act as physical crosslinking points, which results in excellent toughness and good processability. (2) The POE plastic has no unsaturated double bond in the molecular structure and has excellent ageing resistance. (3) The POE plastic has narrow molecular weight distribution, better fluidity and good compatibility with polyolefin. (4) The good fluidity can improve the dispersion effect of the filler and simultaneously can also improve the weld mark strength of the product;
The polyethylene is High Density Polyethylene (HDPE), the High Density Polyethylene (HDPE) is a white powder or granular product, is nontoxic and tasteless, has the crystallinity of 80-90 percent, the softening point of 125-l 35 ℃, and the use temperature of 100 ℃;
The ethylene propylene diene monomer is prepared by synthesizing ethylene and propylene serving as main raw materials, has outstanding aging resistance, electrical insulation performance and ozone resistance, and has the preferred type of 4725P;
the magnesium hydroxide is white amorphous powder. The suspension of Magnesium hydroxide in water is called Magnesium hydroxide emulsion, abbreviated as magnesian emulsion, and british name is Magnesium hydroxide, also known as caustic magnesite or light-burned magnesite. The magnesium hydroxide is an excellent flame retardant for plastic and rubber products;
The decabromodiphenylethane is a broad-spectrum additive type flame retardant with wide application range, has high bromine content, good thermal stability and good ultraviolet resistance, and has low exudation compared with other brominated flame retardants; it is especially suitable for producing high-grade material for computer, facsimile, telephone, copying machine, household appliance, etc. 06. The antimony trioxide (chemical formula: Sb2O 3) is an inorganic compound. The natural product is named as antimony white, commonly named as antimony white and white crystalline powder. Melting point 655 deg.C. The boiling point is 1550 ℃. Dissolving in sodium hydroxide solution, hot tartaric acid solution, tartrate solution and sodium sulfide solution, and slightly dissolving in 370 + -37 mug/L water, dilute nitric acid and dilute sulfuric acid. Has carcinogenic potential. The preparation method comprises a dry method and a wet method, is mainly used for white pigment, paint and plastics, and can play a role in pigment and flame retardance;
Antioxidants are a class of chemicals which, when present in only small amounts in polymer systems, retard or inhibit the progress of the polymer oxidation process, thereby preventing the aging of the polymer and extending its useful life, also known as "age resistors";
the zinc stearate is white powder and is insoluble in water. Mainly used as a lubricant and a release agent of styrene resin, phenolic resin and amino resin. Meanwhile, the rubber also has the functions of a vulcanization activator and a softener.
the polyethylene wax (PE wax) is also called high-molecular wax for short. It is widely used because of its excellent cold resistance, heat resistance, chemical resistance and wear resistance. In normal production, this wax can be added directly to the polyolefin process as an additive, which can increase the gloss and processability of the product. As a lubricant, the lubricant has stable chemical properties and good electrical properties. The polyethylene wax has good compatibility with polyethylene, polypropylene, polyethylene wax, ethylene propylene rubber and butyl rubber;
The white oil plays a role of a plasticizer, and one of epoxidized soybean oil or dioctyl terephthalate is preferably used as the white oil;
the Color Master Batch is a novel special colorant for high polymer materials and is also called Pigment Preparation (Pigment Preparation). The color master is mainly used for plastics. Color concentrates are composed of three basic elements, Pigment or dye, carrier and additive, and are aggregates prepared by uniformly supporting an excessive amount of Pigment in a resin, which can be referred to as Pigment concentrates (Pigment concentrates), so that they have a higher tinctorial strength than the Pigment itself. During processing, a small amount of color master batch is mixed with uncolored resin, and colored resin or products with designed pigment concentration can be obtained.
A process for manufacturing a flame-retardant high-molecular heat-shrinkable high-voltage insulating sleeve comprises the following steps,
according to the material formula of the flame-retardant high-molecular heat-shrinkable low-voltage insulating sleeve, ethylene-vinyl acetate copolymer (EVA), Polyethylene (PE), POE, ethylene propylene diene monomer, magnesium hydroxide, decabromodiphenylethane, antimony trioxide, a composite antioxidant, a zinc stearate release agent, special polyethylene wax, white oil and color master are sequentially placed into a special high-speed mixer for plastic, mixed and dissolved for 5-8 minutes at a high speed, in the mixing process, the mixer does not need to be heated, then the mixed materials are put into a hopper of a special double-screw high-speed granulator, are extruded and drawn at the temperature range of 125-160 ℃ through the special double-screw high-speed granulator after forced feeding, then the mixture enters a water tank for cooling, the water on the surface of the mixture is removed by two plastic blow-drying machines after the mixture is discharged from the water tank, and then the mixture is granulated by a special granulator to obtain raw material master batches; extruding the prepared master batch by using a special single-screw extruder for PE materials with an automatic feeding and drying device at the temperature range of 115-150 ℃ to obtain an original pipe of the flame-retardant high-molecular heat-shrinkable low-voltage insulating sleeve; irradiating and crosslinking the original pipe of the prepared flame-retardant high-molecular heat-shrinkable low-voltage insulating sleeve by a high-molecular electron accelerator, wherein the irradiation dose is 6-12 Mrad; and (3) carrying out vacuum external pressure expansion on the irradiated original pipe by 2-4 times by using a high-speed vertical electromagnetic heating expander within the temperature range of 105-160 ℃, and then cooling and shaping the outside to obtain the flame-retardant high-molecular heat-shrinkable low-voltage insulating sleeve.
The first embodiment is as follows:
Taking 18 parts of ethylene-vinyl acetate copolymer (EVA), 3 parts of Polyethylene (PE), 3 parts of POE, 4 parts of ethylene propylene diene monomer, 16 parts of magnesium hydroxide, 4 parts of decabromodiphenylethane, 1.5 parts of antimony trioxide, 1.5 parts of composite antioxidant, 0.4 part of zinc stearate release agent, 0.3 part of special polyethylene wax, 0.5 part of white oil and 1.5 parts of color master batch according to parts by weight;
(1) sequentially putting the materials into a special high-speed mixer for plastic, mixing the materials at a high speed for 5-8 minutes, wherein the mixer does not need to be heated in the mixing process, then putting the mixed materials into a hopper of a special high-speed granulator for double screws, carrying out forced feeding, then extruding the materials by the special high-speed granulator for double screws within a temperature range of 125 ℃ plus 160 ℃, drawing wires, then cooling the materials in a water tank, removing surface water by two plastic blow-drying machines after the materials are discharged from the water tank, and then carrying out grain cutting by a special grain cutting machine to obtain raw material master batches;
(2) Extruding the master batch prepared in the step (1) by using a single-screw extruder special for PE materials with an automatic feeding and drying device at a temperature range of 115 ℃ and 150 ℃ to obtain an original pipe of the flame-retardant high-molecular heat-shrinkable low-voltage insulating sleeve;
(3) Irradiating and crosslinking the original pipe of the flame-retardant high-molecular heat-shrinkable low-voltage insulating sleeve prepared in the step (2) by a high-molecular electron accelerator, wherein the irradiation dose is 6-12 Mrad;
(4) And (4) carrying out vacuum external pressure expansion on the original pipe irradiated in the step (3) by 2-4 times by using a high-speed vertical electromagnetic heating expander within the temperature range of 105-160 ℃, and then cooling and shaping the outside to obtain the flame-retardant high-polymer heat-shrinkable low-voltage insulating sleeve. The test results of the above prepared products according to the UL94 standard are as follows:
1. shrinkage onset temperature 95 ℃, complete shrinkage temperature 120 ℃ standard index: < 115 ℃ to 135 DEG C
2. The insulation strength (dielectric strength) | is a standard index of 30 kv/mm: 6kv/mm
3. Tensile strength 11.23MPa standard index: ≧ 8MPa
4. flame retardant rating V0 standard index: v1
5. Elongation at break 405% standard index: not less than 300%
the results of the comparative tests are all passed.
The second implementation:
Taking 27 parts of ethylene-vinyl acetate copolymer (EVA), 4.5 parts of Polyethylene (PE), 4.5 parts of POE, 6 parts of ethylene propylene diene monomer, 24 parts of magnesium hydroxide, 6 parts of decabromodiphenylethane, 4.5 parts of antimony trioxide, 2.3 parts of composite antioxidant, 0.6 part of hard zinc mold release agent, 0.5 part of special polyethylene wax, 0.7 part of white oil and 2.3 parts of color master batch according to parts by weight;
(1) Sequentially putting the materials into a special high-speed mixer for plastic, mixing the materials at a high speed for 5-8 minutes, putting the mixed materials into a hopper of a special high-speed granulator for double screws without heating in the mixing process, forcibly feeding the materials, extruding the materials by the special high-speed granulator for the double screws within a temperature range of 125 plus 160 ℃, drawing the materials, cooling the materials in a water tank, removing surface water by two plastic blow-drying machines after the materials are discharged from the water tank, granulating the materials by a special granulator to obtain raw material master batches,
2) extruding the master batch prepared in the step (1) by using a single-screw extruder special for PE materials with an automatic feeding and drying device at a temperature range of 115 ℃ and 150 ℃ to obtain an original pipe of the flame-retardant high-molecular heat-shrinkable low-voltage insulating sleeve;
(3) Irradiating and crosslinking the original pipe of the flame-retardant high-molecular heat-shrinkable low-voltage insulating sleeve prepared in the step (2) by a high-molecular electron accelerator, wherein the irradiation dose is 6-12 Mrad;
(4) And (4) carrying out vacuum external pressure expansion on the original pipe irradiated in the step (3) by 2-4 times by using a high-speed vertical electromagnetic heating expander within the temperature range of 105-160 ℃, and then cooling and shaping the outside to obtain the flame-retardant high-polymer heat-shrinkable low-voltage insulating sleeve. The test results of the above prepared products according to the UL94 standard are as follows:
1. shrinkage onset temperature 98 ℃, complete shrinkage temperature 120 ℃, standard index: < 115 ℃ to 135 DEG C
2. The insulation strength (dielectric strength) | is a standard index of 29 kv/mm: 6kv/mm
3. Tensile strength 12.23MPa standard index: ≧ 8MPa
4. Flame retardant rating V0 standard index: v1
5. elongation at break 398% standard index: not less than 300%
the results of the comparative tests are all passed.
and (3) implementation:
taking 36 parts of vinyl acetate copolymer (EVA), 6 parts of Polyethylene (PE), 6 parts of POE, 8 parts of ethylene propylene diene monomer, 28 parts of magnesium hydroxide, 8 parts of decabromodiphenylethane, 3 parts of antimony trioxide, 3 parts of composite antioxidant, 0.8 part of hard zinc release agent, 0.6 part of special polyethylene wax, 1.0 part of white oil and 3 parts of color master batch according to parts by weight;
(1) Sequentially putting the materials into a special high-speed mixer for plastic, mixing the materials at a high speed for 5-8 minutes, wherein the mixer does not need to be heated in the mixing process, then putting the mixed materials into a hopper of a special high-speed granulator for double screws, carrying out forced feeding, then extruding the materials by the special high-speed granulator for double screws within a temperature range of 125 ℃ plus 160 ℃, drawing wires, then cooling the materials in a water tank, removing surface water by two plastic blow-drying machines after the materials are discharged from the water tank, and then carrying out grain cutting by a special grain cutting machine to obtain raw material master batches;
(2) Extruding the master batch prepared in the step (1) by using a single-screw extruder special for PE materials with an automatic feeding and drying device at the temperature range of 115 ℃ plus 150 ℃ to obtain the original pipe of the flame-retardant high-molecular heat-shrinkable low-voltage insulating sleeve
(3) Irradiating and crosslinking the original pipe of the flame-retardant high-molecular heat-shrinkable low-voltage insulating sleeve prepared in the step (2) by a high-molecular electron accelerator, wherein the irradiation dose is 6-12 Mrad;
(4) And (4) carrying out vacuum external pressure expansion on the original pipe irradiated in the step (3) by 2-4 times by using a high-speed vertical electromagnetic heating expander within the temperature range of 105-160 ℃, and then cooling and shaping the outside to obtain the flame-retardant high-polymer heat-shrinkable low-voltage insulating sleeve. The test results of the above prepared products according to the UL94 standard are as follows:
1. shrinkage onset temperature of 103 ℃, complete shrinkage temperature of 120 ℃, standard index: < 115 ℃ to 135 DEG C
2. the insulation strength (dielectric strength) | is a standard index of 34 kv/mm: 6kv/mm
3. tensile strength 10.8MPa standard index: ≧ 8MPa
4. flame retardant rating V0 standard index: v1
5. elongation at break 409% standard index: not less than 300%
the results of the comparative tests are all passed.
from the above three experimental performance test results, the following conclusions can be drawn: the material formula of the flame-retardant high-polymer heat-shrinkable high-voltage insulating sleeve provided by each experimental example and the manufacturing process thereof can be used for manufacturing the high-voltage flame-retardant heat-shrinkable insulating sleeve, wherein the mechanical properties, the insulating properties and the flame-retardant grade of the high-voltage flame-retardant heat-shrinkable insulating sleeve completely meet the requirements of the national standard of the electric power industry (DL/T1059-2007 heat-shrinkable sleeves for electric power equipment): the tensile length is not less than 8MPa, the elongation at break is not less than 300%, and the flame retardant grade is V1, more importantly, the flame retardant high polymer heat shrinkable high voltage insulating sleeve manufactured by the formula and the manufacturing process also has good low-temperature contractibility and excellent insulating property, and more importantly, the flame retardant grade is very high, so that the flame retardant high voltage insulating sleeve has a very good guarantee effect on energy conservation, environmental protection and electricity safety, greatly reduces the fire safety hazard of electric power and electricity in the using process, and plays a great role in guaranteeing the safety of people and property.
it is to be emphasized that: it will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (7)
1. The material formula of the flame-retardant high-molecular heat-shrinkable high-voltage insulating sleeve is characterized in that: comprises the following components in parts by weight: 18-36 parts of ethylene-vinyl acetate copolymer (EVA), 3-6 parts of Polyethylene (PE), 3-6 parts of POE, 4-8 parts of ethylene propylene diene monomer, 16-28 parts of magnesium hydroxide, 4-8 parts of decabromodiphenylethane, 1.5-3 parts of antimony trioxide, 0.5-1 part of composite antioxidant, 0.4-0.8 part of hard zinc release agent, 0.3-0.6 part of special polyethylene wax, 0.5-1.0 part of white oil and 1.5-3 parts of color master batch.
2. The material formula of the flame-retardant high-molecular heat-shrinkable high-voltage insulating sleeve according to claim 1, wherein: the ethylene-vinyl acetate copolymer (EVA) is preferably V5110J va 18-3.
3. the material formula of the flame-retardant high-molecular heat-shrinkable high-voltage insulating sleeve according to claim 1, wherein: the POE is a thermoplastic elastomer which adopts metallocene catalyst to realize in-situ polymerization of ethylene and octene.
4. The material formula of the flame-retardant high-molecular heat-shrinkable high-voltage insulating sleeve according to claim 1, wherein: the polyethylene is High Density Polyethylene (HDPE).
5. The material formula of the flame-retardant high-molecular heat-shrinkable high-voltage insulating sleeve according to claim 1, wherein: the preferable model of the ethylene propylene diene monomer is 4725P.
6. the material formula of the flame-retardant high-molecular heat-shrinkable high-voltage insulating sleeve according to claim 1, wherein: the white oil is preferably epoxidized soybean oil or dioctyl terephthalate.
7. the manufacturing process of the flame-retardant high-molecular heat-shrinkable high-voltage insulating sleeve according to any one of claims 1 to 6, which is characterized in that: comprises the following steps of (a) carrying out,
s1, according to the material formula of the flame-retardant high-molecular heat-shrinkable low-voltage insulating sleeve, sequentially putting ethylene-vinyl acetate copolymer (EVA), Polyethylene (PE), POE, ethylene propylene diene monomer, magnesium hydroxide, decabromodiphenylethane, antimony trioxide, a composite antioxidant, a hard zinc release agent, special polyethylene wax, white oil and color master batch into a special high-speed mixer for plastic cement, mixing and dissolving for 5-8 minutes at a high speed, in the mixing process, the mixer does not need to be heated, then the mixed materials are put into a hopper of a special double-screw high-speed granulator, are extruded and drawn at the temperature range of 125-160 ℃ through the special double-screw high-speed granulator after forced feeding, then the mixture enters a water tank for cooling, the water on the surface of the mixture is removed by two plastic blow-drying machines after the mixture is discharged from the water tank, and then the mixture is granulated by a special granulator to obtain raw material master batches;
S2, extruding the master batch prepared in the step S1 by using a single-screw extruder special for PE materials with an automatic feeding and drying device at the temperature range of 115-150 ℃ to obtain an original pipe of the flame-retardant high-polymer heat-shrinkable low-voltage insulating sleeve;
s3, subjecting the original pipe of the flame-retardant high-molecular heat-shrinkable low-voltage insulating sleeve prepared in the step S2 to irradiation crosslinking through a high-molecular electron accelerator, wherein the irradiation dose is 6-12 Mrad;
S4, carrying out vacuum external pressure expansion on the original pipe irradiated in the step S3 by 2-4 times by using a high-speed vertical electromagnetic heating expander within the temperature range of 105-160 ℃, and then cooling and shaping the outside to obtain the flame-retardant high-polymer heat-shrinkable low-voltage insulating sleeve.
Priority Applications (1)
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| CN114864163A (en) * | 2022-05-06 | 2022-08-05 | 湖北南远电缆科技有限公司 | High-temperature-resistant flame-retardant cable |
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