CN117247620A - Crosslinked polyethylene flame-retardant cable and preparation method thereof - Google Patents

Crosslinked polyethylene flame-retardant cable and preparation method thereof Download PDF

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CN117247620A
CN117247620A CN202311298986.0A CN202311298986A CN117247620A CN 117247620 A CN117247620 A CN 117247620A CN 202311298986 A CN202311298986 A CN 202311298986A CN 117247620 A CN117247620 A CN 117247620A
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crosslinked polyethylene
magnesium hydroxide
parts
flame
retardant cable
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蔡军涛
蔡光炜
褚晓辉
王晓
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Crossing Cable Group Co ltd
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Crossing Cable Group Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/34—Silicon-containing compounds
    • C08K3/346—Clay
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/02—Elements
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K9/00—Use of pretreated ingredients
    • C08K9/04—Ingredients treated with organic substances
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K9/00—Use of pretreated ingredients
    • C08K9/10—Encapsulated ingredients
    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/02—Elements
    • C08K2003/026—Phosphorus
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2217—Oxides; Hydroxides of metals of magnesium
    • C08K2003/2224—Magnesium hydroxide
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/02—Flame or fire retardant/resistant
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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    • C08L2201/00—Properties
    • C08L2201/08—Stabilised against heat, light or radiation or oxydation
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2203/00—Applications
    • C08L2203/20—Applications use in electrical or conductive gadgets
    • C08L2203/202—Applications use in electrical or conductive gadgets use in electrical wires or wirecoating

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Abstract

The application relates to the technical field of cable manufacturing, and particularly discloses a crosslinked polyethylene flame-retardant cable and a preparation method thereof. A crosslinked polyethylene flame-retardant cable, which comprises a conductor and a sheath, wherein the sheath is wrapped on the surface of the conductor; the sheath comprises the following raw materials in terms of the total weight of the sheath: crosslinked polyethylene, nano montmorillonite, modified magnesium hydroxide, plasticizer and smoke suppressionAgents, antioxidants, and lubricants; the magnesium hydroxide is obtained by coating and modifying sodium dodecyl sulfate and triethyl phosphate in sequence. The tensile strength and the elongation at break of the crosslinked polyethylene flame-retardant cable obtained by the method are 16.5MPa and 205% respectively, and the crosslinked polyethylene flame-retardant cable has high mechanical properties; the limiting oxygen index of the flame-retardant aluminum alloy cable can reach 55%, and the minimum smoke density of flameless and flame is 96kg.m respectively ‑3 And 40kg.m ‑3 The UL94 vertical burning grade reaches V-0, and the flame retardance of the cable is improved.

Description

Crosslinked polyethylene flame-retardant cable and preparation method thereof
Technical Field
The application relates to the technical field of cable manufacturing, in particular to a crosslinked polyethylene flame-retardant cable and a preparation method thereof.
Background
The cable is a rope-like cable formed by twisting several or groups of wires (at least two wires in each group), wherein each group of wires are mutually insulated and are often twisted around a center, and the whole outer surface is covered with a high-insulation sheath. The cable has an inner energized, outer insulated feature. The cable is widely used in the industries of power, communication, construction and the like,
with the development of electric power energy, the requirements for various performances of the cable are rapidly increased, and meanwhile, the safety performance of the cable is also continuously improved. The cable has high extinguishing difficulty when electric fire occurs, environmental protection and fire safety are considered, the medium-voltage cable sheath is mainly made of polyethylene, and the medium-voltage cable sheath has excellent insulating and dielectric properties, but the polyethylene is not heat-resistant and is easy to burn, and the defect of easy burning is often overcome by adopting a crosslinking modification means.
In the related art, a flame retardant is usually added into a sheath raw material to improve the flame retardant effect of the cable, but the flame retardant is difficult to uniformly disperse in the sheath raw material, and is easy to migrate and segregate in the process of heating the sheath raw material, and the low consumption of the flame retardant can lead to general flame retardance, and the excessive consumption can reduce the mechanical property of the sheath.
Disclosure of Invention
In order to improve the flame retardance of the cable on the basis of ensuring the mechanical property of the cable sheath, the application provides a crosslinked polyethylene flame-retardant cable and a preparation method thereof.
In a first aspect, the present application provides a crosslinked polyethylene flame retardant cable, which adopts the following technical scheme:
a crosslinked polyethylene flame-retardant cable, which comprises a conductor and a sheath, wherein the sheath is wrapped on the surface of the conductor; the sheath comprises the following raw materials in parts by weight based on the total weight of the sheath: 90-110 parts of crosslinked polyethylene, 8-12 parts of nano montmorillonite, 20-30 parts of modified magnesium hydroxide, 25-35 parts of plasticizer, 1-3 parts of smoke suppressant, 0.1-0.3 part of antioxidant and 3-5 parts of lubricant;
the magnesium hydroxide is obtained by coating and modifying sodium dodecyl sulfate and triethyl phosphate in sequence.
The raw materials of the crosslinked polyethylene flame-retardant cable sheath can be 90-110 parts of crosslinked polyethylene, 8-12 parts of nano montmorillonite, 20-30 parts of modified magnesium hydroxide, 25-35 parts of plasticizer, 1-3 parts of smoke suppressant, 0.1-0.3 part of antioxidant and 3-5 parts of lubricant, can be selected from any value in the respective ranges, and can improve the flame retardance of the cable.
The crosslinked polyethylene is used as the main raw material of the sheath, so that the strength, hardness and durability of the cable sheath can be improved, and the sheath has higher heat resistance and chemical corrosion resistance. The nano montmorillonite is added, and the crosslinked polyethylene can be modified by utilizing the lamellar structure of the nano montmorillonite so as to slow down the migration speed of the flame retardant, reduce the dosage of modified magnesium hydroxide and improve the toughness, strength and processability of the material. In addition, reducing the amount of modified magnesium hydroxide can reduce the melt-drip properties of the material.
The magnesium hydroxide is an important inorganic flame-retardant material, is favorable for absorbing combustion heat, improving flame-retardant efficiency, improving sheath processing temperature, accelerating extrusion molding speed and shortening molding time, but has strong surface polarity and is easy to agglomerate, so that the magnesium hydroxide is added with modified magnesium hydroxide, and is sequentially coated and modified by sodium dodecyl sulfate and triethyl phosphate, thereby reducing surface tension between the magnesium hydroxide, reducing agglomeration phenomenon, effectively improving compatibility between the magnesium hydroxide and crosslinked polyethylene, enhancing dispersibility and stability of the magnesium hydroxide, improving flame retardance of the sheath, and improving elongation at break and tensile strength of the sheath.
The plasticizer enhances the elasticity and toughness of the material, and further improves the processing performance of the material. The smoke suppressant can reduce the smoke amount of the modified magnesium hydroxide and the release amount of toxic and harmful gases. Antioxidants can prevent degradation of material properties due to thermal aging. The lubricant has excellent internal and external lubrication balance, improves rheological property, and can improve scratch resistance and cable surface flaws of the cable surface.
As preferable: the sheath comprises the following raw materials in parts by weight: 95-105 parts of crosslinked polyethylene, 9-11 parts of nano montmorillonite, 24-28 parts of modified magnesium hydroxide, 28-32 parts of plasticizer, 1.5-2.5 parts of smoke suppressant, 0.15-0.25 part of antioxidant and 3.5-4.5 parts of lubricant.
The raw materials of the sheath can be selected from 95-105 parts of crosslinked polyethylene, 9-11 parts of nano montmorillonite, 24-28 parts of modified magnesium hydroxide, 28-32 parts of plasticizer, 1.5-2.5 parts of smoke suppressant, 0.15-0.25 part of antioxidant and 3.5-4.5 parts of lubricant, the mixing amount of the raw materials of the sheath can be selected from any value in the respective range, and the flame retardance of the crosslinked polyethylene flame-retardant cable can be further improved.
As preferable: the modified magnesium hydroxide is prepared by the following steps:
adding magnesium hydroxide into dimethylbenzene, stirring uniformly, adding sodium dodecyl sulfate, stirring and coating, adding triethyl phosphate, stirring at 150-180 ℃ for 20-60min for coating, filtering, drying and crushing to obtain modified magnesium hydroxide.
The mass ratio of the magnesium hydroxide to the dimethylbenzene is 1: (4-8).
By adopting the technical scheme, the sodium dodecyl sulfate is embedded, the special 'amphiphilic structure' of the sodium dodecyl benzene sulfonate is utilized to carry out surface modification on the magnesium hydroxide under the action of Van der Waals force, and the triethyl phosphate is added to further coat and modify the magnesium hydroxide, so that the dispersibility of the modified magnesium hydroxide is improved, and the flame retardant effect of the modified magnesium hydroxide is improved.
As preferable: the mass ratio of the magnesium hydroxide to the sodium dodecyl sulfonate is 1: (2-3).
By adopting the technical scheme, the mass ratio of the magnesium hydroxide to the sodium dodecyl sulfonate is adjusted, so that the modification effect of the magnesium hydroxide can be further improved, and the flame retardance of the cable is improved.
As preferable: the mass ratio of the magnesium hydroxide to the triethyl phosphate is 1: (2-3).
By adopting the technical scheme, the mass ratio of the magnesium hydroxide to the triethyl phosphate is adjusted, so that the modification effect of the magnesium hydroxide can be further improved, and the flame retardance of the cable is improved.
As preferable: performing ultrasonic dispersion after adding triethyl phosphate; the ultrasonic dispersion condition is 150-230W, 50-60 ℃ and 5-10min.
By adopting the technical scheme, ultrasonic dispersion is carried out after the triethyl phosphate is added, and the ultrasonic dispersion condition is controlled, so that the coating effect of the triethyl phosphate on the magnesium hydroxide can be improved.
As preferable: the raw materials of the crosslinked polyethylene flame-retardant cable also comprise the following raw materials in parts by weight: 0.1-0.3 part of red phosphorus.
By adopting the technical scheme, the red phosphorus and the crosslinked polyethylene form polymetaphosphoric acid through a series of changes in the combustion process, so that a sticky thin film is formed to wrap the surface of the sheath, the contact between oxygen and the sheath is reduced, and the oxidation process is inhibited; in addition, phosphoric acid, metaphosphoric acid, polymetaphosphoric acid and the like formed by red phosphorus are used as dehydrating agents to promote the sheath to be dehydrated and carbonized, so that the flame retardant effect of the cable can be further improved.
As preferable: the lubricant is liquid chlorinated paraffin.
By adopting the technical scheme, the liquid chlorinated paraffin is selected as the lubricant, so that the dispersibility of red phosphorus in the crosslinked polyethylene can be improved.
As preferable: the plasticizer is at least one of alkyl diaryl phosphate, triaryl phosphate and trioctyl trimellitate; the smoke suppressant is at least one of ammonium octamolybdate and molybdenum trioxide.
By adopting the technical scheme, the alkyl diaryl phosphate and the triaryl phosphate have certain flame retardant property, and the flame retardance of the cable can be improved. Ammonium octamolybdate and molybdenum trioxide can improve the flame-retardant and smoke-suppressing effects.
In a second aspect, the present application provides a method for preparing a crosslinked polyethylene flame retardant cable according to any one of the above.
The crosslinked polyethylene flame-retardant cable is prepared by the following operation steps:
and mixing and stirring the raw materials of the sheath, removing bubbles, extruding and coating the outer surface of the conductor to form the sheath, thus obtaining the crosslinked polyethylene flame-retardant cable.
In summary, the present application includes at least one of the following beneficial technical effects:
(1) The limiting oxygen index of the crosslinked polyethylene flame-retardant cable is 45 percent by controlling the raw materials and the mixing amount of the sheath, and the smoke density of the flameless and the flame is 110kg.m respectively -3 And 53kg.m -3 The flame retardance of the cable is improved.
(2) In the process of modifying magnesium hydroxide, the limiting oxygen index of the crosslinked polyethylene flame-retardant cable is 46-48% by adjusting the proportion of raw materials required by modification, and the smoke density of flameless and flameless is 106-108kg.m respectively -3 And 50-53kg.m -3 The flame retardance of the cable is further improved.
(3) According to the application, through ultrasonic dispersion after the triethyl phosphate is added in the process of modifying magnesium hydroxide, the limiting oxygen index of the crosslinked polyethylene flame-retardant cable is 51%, and the smoke density of flameless and flameless is 100kg.m respectively -3 And 44kg.m -3 The flame retardance of the cable is further improved.
(4) The limiting oxygen index of the crosslinked polyethylene flame-retardant cable is 55% by adding red phosphorus into the sheath raw material and controlling the mixing amount of the red phosphorus, and the smoke density of flameless and flameless is 96kg.m respectively -3 And 40kg.m -3 The flame retardance of the cable is further improved.
Detailed Description
The present application is described in further detail below in connection with specific examples.
The following raw materials are all commercial products, and are fully disclosed in the present application, and should not be construed as limiting the sources of the raw materials. The method comprises the following steps: crosslinked polyethylene, brand number Wen, brand number ZW01; nano montmorillonite with a particle size of 200 meshes; the plasticizer is triaryl phosphate, and the content of active ingredients is 99%; the smoke suppressant is ammonium octamolybdate with the content of active ingredients of 99 percent; antioxidant, model DSTP, and active substance content of 99%; the lubricant is liquid chlorinated paraffin, the content of active ingredients is 99%, the viscosity is 150-250, and polybutylene terephthalate is selected; magnesium hydroxide with a particle size of 30nm; xylene, the active ingredient content is 99%; sodium dodecyl sulfonate, the content of active ingredients is 60%; triethyl phosphate with 99% active ingredient content; red phosphorus with an active ingredient content of 98.5%; the conductor is made of steel core aluminum alloy, and the number of aluminum alloy single wires is 24.
The following is a preparation example of modified magnesium hydroxide
Preparation example 1
The modified magnesium hydroxide of preparation example 1 is prepared by the following operation steps:
referring to the blending amount of table 1, magnesium hydroxide was added to xylene and stirred uniformly, sodium dodecyl sulfate was added, stirred and coated, triethyl phosphate was added, stirred and coated at 160 ℃ for 40min, filtered, dried and crushed to obtain modified magnesium hydroxide.
PREPARATION EXAMPLES 2 to 5
The modified magnesium hydroxide of preparation examples 2-5 was the same as the preparation method of preparation example 1, except that the blending amounts of the respective raw materials were different, and the specific blending amounts are shown in Table 1.
TABLE 1 preparation examples 1-5 respective raw material blending amounts (kg) of modified magnesium hydroxide
Preparation examples 6 to 9
The modified magnesium hydroxide of preparation examples 6 to 9 was the same as the preparation method of preparation example 3, except that the blending amounts of the respective raw materials were different, and the specific blending amounts are shown in Table 2.
TABLE 2 preparation examples 6-9 respective raw material blending amounts (kg) of modified magnesium hydroxide
Example 1
The crosslinked polyethylene flame-retardant cable of example 1 was prepared by the following preparation method:
referring to the blending amount of table 3, each raw material of the sheath was kneaded, stirred, debubbled, extruded and coated on the outer surface of the conductor to form the sheath, and the crosslinked polyethylene flame-retardant cable was obtained. Wherein the modified magnesium hydroxide is prepared in preparation example 1.
Examples 2 to 3
The preparation method of the crosslinked polyethylene flame-retardant cable of examples 2-3 is the same as that of example 1, except that the blending amount of the raw materials is different, and the specific details are shown in table 3.
TABLE 3 examples 1-3 amounts of raw materials (kg) of crosslinked polyethylene flame retardant cables
Examples 4 to 11
The preparation method of the crosslinked polyethylene flame-retardant cable of examples 4 to 11 is the same as that of example 2, except that modified magnesium hydroxide prepared in preparation examples 2 to 9 is selected as modified magnesium hydroxide, respectively, and the types and the blending amounts of the other raw materials are the same as those of example 2.
Example 12
The preparation method of the crosslinked polyethylene flame-retardant cable of example 12 is the same as that of example 9, except that the ultrasonic dispersion is carried out after the triethyl phosphate is added in the modification process of the magnesium hydroxide, and the ultrasonic dispersion condition is 200W, 55 ℃ and 8min.
Examples 13 to 15
Examples 13-15 crosslinked polyethylene flame-retardant cables were prepared in the same manner as in example 12 except that red phosphorus was added to the jacket material, and the specific blending amounts are shown in Table 4.
TABLE 4 examples 13-15 raw materials blend (kg) of crosslinked polyethylene flame retardant cable
Example 16
Example 16 a crosslinked polyethylene flame retardant cable was prepared in the same manner as in example 14 except that polybutylene terephthalate was used as the lubricant and the remainder was prepared in the same manner as in example 1.
Comparative example 1
The preparation method of the crosslinked polyethylene flame-retardant cable of comparative example 1 is the same as that of example 1, except that the modified magnesium hydroxide in the sheath raw material is replaced by unmodified magnesium hydroxide in the same amount, and the types and the blending amounts of the other raw materials are the same as those of example 1.
Comparative example 2
The preparation method of the crosslinked polyethylene flame-retardant cable of comparative example 2 is the same as that of example 1, except that the specific method for modifying the modified magnesium hydroxide is to add 1kg of magnesium hydroxide into 6kg of xylene, uniformly stir, add 1kg of sodium dodecyl sulfate, stir and coat, filter, dry and crush to obtain the modified magnesium hydroxide.
Comparative example 3
The preparation method of the crosslinked polyethylene flame-retardant cable of comparative example 3 is the same as that of example 1, except that the specific method for modifying the modified magnesium hydroxide is to add 1kg of magnesium hydroxide into 6kg of xylene, uniformly stir, add 1kg of triethyl phosphate, stir for 40min at 160 ℃ for coating, filter, dry and crush to obtain the modified magnesium hydroxide.
Performance detection
The crosslinked polyethylene flame-retardant cables obtained in examples 1 to 16 and comparative examples 1 to 3 were subjected to performance test using the following test standards or methods, respectively, and the test results are shown in Table 5.
Tensile strength: detecting the tensile strength of the cable according to GB/T1043-2008;
elongation at break: detecting the breaking elongation of the cable according to GB/T1043-2008;
limiting oxygen index: according to GB/T2406.2-2018, detecting the limiting oxygen index of the cable by adopting an oxygen index tester;
smoke density: detecting the flameless and flame smoke density of the cable according to GB/T8627-2007;
UL94 vertical burn rating: UL94 vertical burn rating of the cable was tested according to GB/T2408-2008.
Table 5 results of testing the flame retardant cable properties of different crosslinked polyethylenes
The test results in Table 5 show that the tensile strength and the elongation at break of the crosslinked polyethylene flame-retardant cable obtained by the method are 16.5MPa and 205% respectively, and the crosslinked polyethylene flame-retardant cable has higher mechanical properties; and flame-retardant aluminum alloy cableThe maximum limiting oxygen index can reach 55%, and the minimum smoke density of flameless and flame is 96kg.m respectively -3 And 40kg.m -3 The UL94 vertical burning grade reaches V-0, and the flame retardance of the cable is improved.
In examples 1 to 3, the limiting oxygen index of the crosslinked polyethylene flame-retardant cable obtained in example 2 was 45%, which was higher than that of examples 1 and 3, and the smoke density of flameless and flame were 110kg.m, respectively -3 And 53kg.m -3 The modified magnesium hydroxide in the crosslinked polyethylene flame-retardant cable of the embodiment 2 is more suitable than that of the embodiment 1 and the embodiment 3, so that the flame retardance of the cable is improved, the modified magnesium hydroxide is possibly an important inorganic flame-retardant material with magnesium hydroxide, the flame retardance is improved, the improvement of the processing temperature of the sheath is facilitated, the extrusion molding speed is accelerated, the molding time is shortened, the magnesium hydroxide is sequentially coated and modified by sodium dodecyl sulfate and triethyl phosphate, the surface tension between the magnesium hydroxide is reduced, the agglomeration phenomenon is reduced, the compatibility between the magnesium hydroxide and the crosslinked polyethylene is effectively improved, the dispersibility and the stability of the magnesium hydroxide are enhanced, the flame retardance of the sheath is improved, and the breaking elongation and the tensile strength of the sheath are improved.
The test data of the properties of the crosslinked polyethylene flame-retardant cables of examples 2 and examples 4 to 7 combined show that the crosslinked polyethylene flame-retardant cables of examples 4 to 6 have a limiting oxygen index of 46 to 48% higher than those of examples 2 and 5 and a smoke density of 106 to 108kg.m, respectively -3 And 50-53kg.m -3 Both lower than example 2 and example 7, indicating a mass ratio of magnesium hydroxide to sodium dodecyl sulfate of 1 during the modification of magnesium hydroxide: (2-3) is preferably carried out, and may be related to the improvement of the flame retardance of the cable by further improving the modifying effect of the magnesium hydroxide by adjusting the mass ratio of the magnesium hydroxide to the sodium dodecyl sulfonate.
The test data of the properties of the crosslinked polyethylene flame-retardant cables of examples 5 and examples 8 to 11 combined show that the crosslinked polyethylene flame-retardant cables of examples 8 to 10 have a limiting oxygen index of 46 to 48%, which is higher than that of examples 2 and 5, and a flameless and a flame-resistant smoke density of 106 to 1, respectively08kg•m -3 And 50-53kg.m -3 Both lower than example 2 and example 7, indicating a mass ratio of magnesium hydroxide to triethyl phosphate of 1 during the modification of magnesium hydroxide: (2-3) is more suitable, possibly related to the improvement of the flame retardance of the cable by further improving the modifying effect of the magnesium hydroxide by adjusting the mass ratio of the magnesium hydroxide to the triethyl phosphate.
The test data of the properties of the crosslinked polyethylene flame-retardant cables of example 9 and example 12 combined revealed that the crosslinked polyethylene flame-retardant cable obtained of example 12 had a limiting oxygen index of 51% higher than that of examples 2 and 5, and that the flameless and flame-resistant smoke densities were 100kg.m, respectively -3 And 44kg.m -3 All are lower than that of example 9, which shows that the flame retardance of the cable can be improved by adding triethyl phosphate in the process of modifying magnesium hydroxide and then performing ultrasonic dispersion under the conditions of 200W, 55 ℃ and 8min. It is possible to relate to the improvement of the coating effect of the triethyl phosphate on the magnesium hydroxide by performing ultrasonic dispersion after the addition of the triethyl phosphate and controlling the conditions of ultrasonic dispersion.
In examples 13 to 15, the limiting oxygen index of the crosslinked polyethylene flame retardant cable obtained in example 14 was 55%, which was higher than in examples 13 and 15, and the smoke density of flameless and flame-retarded was 96kg m, respectively -3 And 40kg.m -3 The red phosphorus content in the sheath raw material of the embodiment 14 is relatively suitable, which is lower than that of the embodiments 13 and 15, so that the flame retardance of the cable can be improved.
The test data of the properties of the crosslinked polyethylene flame-retardant cables of example 14 and example 16 show that the crosslinked polyethylene flame-retardant cable obtained in example 16 has a limiting oxygen index of 53% lower than that of example 14 and a smoke density of 98 kg/m for flameless and flame-resistant, respectively -3 And 44kg.m -3 Higher than example 14, it is shown that the flame retardant effect of the cable is worse than that of liquid chlorinated paraffin when polybutylene terephthalate is used as the wetting agent.
In addition, according to the various index data of the crosslinked polyethylene flame-retardant cables of comparative examples 1-3 and example 1, the flame retardance of the crosslinked polyethylene flame-retardant cable can be improved to different degrees by adding modified magnesium hydroxide into the sheath raw material and coating the modified magnesium hydroxide with sodium dodecyl sulfate and triethyl phosphate in sequence.
The present embodiment is merely illustrative of the present application and is not intended to be limiting, and those skilled in the art, after having read the present specification, may make modifications to the present embodiment without creative contribution as required, but is protected by patent laws within the scope of the claims of the present application.

Claims (10)

1. A crosslinked polyethylene flame-retardant cable, which is characterized by comprising a conductor and a sheath, wherein the sheath is wrapped on the surface of the conductor; the sheath comprises the following raw materials in parts by weight based on the total weight of the sheath: 90-110 parts of crosslinked polyethylene, 8-12 parts of nano montmorillonite, 20-30 parts of modified magnesium hydroxide, 25-35 parts of plasticizer, 1-3 parts of smoke suppressant, 0.1-0.3 part of antioxidant and 3-5 parts of lubricant;
the magnesium hydroxide is obtained by coating and modifying sodium dodecyl sulfate and triethyl phosphate in sequence.
2. The crosslinked polyethylene flame retardant cable of claim 1, wherein the jacket comprises the following raw materials in parts by weight: 95-105 parts of crosslinked polyethylene, 9-11 parts of nano montmorillonite, 24-28 parts of modified magnesium hydroxide, 28-32 parts of plasticizer, 1.5-2.5 parts of smoke suppressant, 0.15-0.25 part of antioxidant and 3.5-4.5 parts of lubricant.
3. The crosslinked polyethylene flame retardant cable of claim 1 wherein the modified magnesium hydroxide is prepared by:
adding magnesium hydroxide into dimethylbenzene, stirring uniformly, adding sodium dodecyl sulfate, stirring and coating, adding triethyl phosphate, stirring at 150-180 ℃ for 20-60min for coating, filtering, drying and crushing to obtain modified magnesium hydroxide; the mass ratio of the magnesium hydroxide to the dimethylbenzene is 1: (4-8).
4. A crosslinked polyethylene flame retardant cable according to claim 3, wherein the mass ratio of magnesium hydroxide to sodium dodecyl sulfonate is 1: (2-3).
5. A crosslinked polyethylene flame retardant cable according to claim 3, wherein the mass ratio of magnesium hydroxide to triethyl phosphate is 1: (2-3).
6. A crosslinked polyethylene flame retardant cable according to claim 3, characterized in that the ultrasonic dispersion is carried out after the addition of triethyl phosphate; the ultrasonic dispersion condition is 150-230W, 50-60 ℃ and 5-10min.
7. The crosslinked polyethylene flame-retardant cable of claim 1, wherein the raw materials of the crosslinked polyethylene flame-retardant cable further comprise the following raw materials in parts by weight: 0.1-0.3 part of red phosphorus.
8. The crosslinked polyethylene flame retardant cable of claim 1 wherein the lubricant is liquid chlorinated paraffin.
9. The crosslinked polyethylene flame-retardant cable of claim 1, wherein the plasticizer is at least one of alkyl diaryl phosphate, triaryl phosphate, trioctyl trimellitate; the smoke suppressant is at least one of ammonium octamolybdate and molybdenum trioxide.
10. A method for preparing a crosslinked polyethylene flame retardant cable according to any of claims 1-9, characterized in that it comprises the following operative steps:
and mixing and stirring the raw materials of the sheath, removing bubbles, extruding and coating the outer surface of the conductor to form the sheath, thus obtaining the crosslinked polyethylene flame-retardant cable.
CN202311298986.0A 2023-10-09 2023-10-09 Crosslinked polyethylene flame-retardant cable and preparation method thereof Pending CN117247620A (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102532948A (en) * 2011-12-30 2012-07-04 大连亚泰科技新材料有限公司 Preparation method and application of modified magnesium hydroxide flame retardant for copper clad plate
CN102558582A (en) * 2011-12-30 2012-07-11 大连亚泰科技新材料有限公司 Method for preparing whole core conveyor belt covered with magnesium hydroxide flame retardants
CN105801993A (en) * 2014-12-30 2016-07-27 上海凯波特种电缆料厂有限公司 Low-smoke halogen-free flame-retardant polyolefin material and preparation method thereof
WO2023035486A1 (en) * 2021-09-13 2023-03-16 江苏亨通电力电缆有限公司 B2-grade flame-retardant cable, preparation method therefor and use thereof
CN116199994A (en) * 2023-05-04 2023-06-02 中东线缆制造有限责任公司 Flame-retardant aluminum alloy cable and preparation method thereof
CN116262846A (en) * 2022-12-05 2023-06-16 浙江万马股份有限公司 Flame-retardant insulating material for cables and preparation method thereof

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102532948A (en) * 2011-12-30 2012-07-04 大连亚泰科技新材料有限公司 Preparation method and application of modified magnesium hydroxide flame retardant for copper clad plate
CN102558582A (en) * 2011-12-30 2012-07-11 大连亚泰科技新材料有限公司 Method for preparing whole core conveyor belt covered with magnesium hydroxide flame retardants
CN105801993A (en) * 2014-12-30 2016-07-27 上海凯波特种电缆料厂有限公司 Low-smoke halogen-free flame-retardant polyolefin material and preparation method thereof
WO2023035486A1 (en) * 2021-09-13 2023-03-16 江苏亨通电力电缆有限公司 B2-grade flame-retardant cable, preparation method therefor and use thereof
CN116262846A (en) * 2022-12-05 2023-06-16 浙江万马股份有限公司 Flame-retardant insulating material for cables and preparation method thereof
CN116199994A (en) * 2023-05-04 2023-06-02 中东线缆制造有限责任公司 Flame-retardant aluminum alloy cable and preparation method thereof

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