CN116675927A - Anti-aging insulating flame-retardant power cable - Google Patents

Anti-aging insulating flame-retardant power cable Download PDF

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CN116675927A
CN116675927A CN202310794057.2A CN202310794057A CN116675927A CN 116675927 A CN116675927 A CN 116675927A CN 202310794057 A CN202310794057 A CN 202310794057A CN 116675927 A CN116675927 A CN 116675927A
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alumina powder
filler
water
parts
tree
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金小博
金梁
王阁
金永武
鲍梦雪
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Ruixin Group Co ltd
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Ruixin 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
    • C08K9/00—Use of pretreated ingredients
    • C08K9/04—Ingredients treated with organic substances
    • C08K9/06—Ingredients treated with organic substances with silicon-containing compounds
    • 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
    • C08K7/00—Use of ingredients characterised by shape
    • C08K7/22—Expanded, porous or hollow particles
    • C08K7/24—Expanded, porous or hollow particles inorganic
    • 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
    • C08K9/02—Ingredients treated with inorganic substances
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/28—Protection against damage caused by moisture, corrosion, chemical attack or weather
    • H01B7/2813—Protection against damage caused by electrical, chemical or water tree deterioration
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/29—Protection against damage caused by extremes of temperature or by flame
    • H01B7/295—Protection against damage caused by extremes of temperature or by flame using material resistant to flame
    • 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
    • C08K2003/2227—Oxides; Hydroxides of metals of aluminium
    • 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
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    • C08K2201/005—Additives being defined by their particle size in general
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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
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A30/00—Adapting or protecting infrastructure or their operation
    • Y02A30/14—Extreme weather resilient electric power supply systems, e.g. strengthening power lines or underground power cables

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Abstract

The application relates to a power transmission system, in particular to an anti-aging insulating flame-retardant power cable, which comprises a battery core and an insulating layer wrapping the battery core, wherein the insulating layer is prepared from the following raw materials in parts by mass: 100 parts of low-density linear polyethylene, 1.2-2.1 parts of cross-linking agent, 0.3-0.45 part of antioxidant and 15-24 parts of water-tree-resistant filler; the anti-hydration filler comprises a filler matrix, wherein the filler matrix is obtained by doping fluxing agent on the surface of alumina powder and re-melting and recrystallizing the surface; the fluxing agent is a mixture of calcium silicate, dicalcium silicate and tricalcium silicate, and the water-tree-resistant filler melts and recrystallizes the outer layer of the aluminum oxide powder at a temperature lower than that of pure aluminum oxide, so that the cable has the advantages of lower density, light weight, higher strength and water resistance, and avoids holes from becoming water-tree aging channels, thereby improving the ageing resistance, insulativity and flame retardance of the cable.

Description

Anti-aging insulating flame-retardant power cable
Technical Field
The present application relates to power transmission systems, and more particularly, to an anti-aging insulated flame retardant power cable.
Background
The power cable is a wire product for transmitting electric energy, information and realizing electromagnetic energy conversion, and is obtained by extruding an insulating layer outside a conductor and adding a sheath layer. At present, the halogen-free flame-retardant cable produced by using the crosslinked polyethylene as the insulating layer material in the power cable has good light weight, high temperature resistance and wear resistance by means of the crosslinked polyethylene, and has better application market in the field of overhead cables.
However, the crosslinked polyethylene has defects, the crosslinked polyethylene can absorb or adhere to moisture in rainy seasons or humid environments, the moisture can gather at microscopic defect removal positions of the insulating layer under the action of an electrified field of the cable, water tree growth is formed, the aging of the cable is accelerated, and when excessive voltage is immersed in a cable power system, insulation is broken down, and power failure is caused.
Disclosure of Invention
The application provides an anti-aging insulating flame-retardant power cable, which aims to solve the problems that crosslinked polyethylene is easy to age in water tree and has weakened insulating property.
The application provides an anti-aging insulating flame-retardant power cable, which adopts the following technical scheme:
the anti-aging insulating flame-retardant power cable comprises a battery cell and an insulating layer wrapping the battery cell, wherein the insulating layer is prepared from the following raw materials in parts by mass: 100 parts of low-density linear polyethylene, 1.2-2.1 parts of cross-linking agent, 0.3-0.45 part of antioxidant and 15-24 parts of water-tree-resistant filler;
the anti-hydration filler comprises a filler matrix, wherein the filler matrix is obtained by doping fluxing agent on the surface of alumina powder and re-melting and re-crystallizing the surface; the fluxing agent is a mixture of calcium silicate, dicalcium silicate and tricalcium silicate.
By adopting the technical scheme, the water tree resistant filler is doped with the fluxing agent of the mixture of calcium silicate, dicalcium silicate and tricalcium silicate on the surface of the alumina powder particles, has a low melting point, is melted first and forms a eutectic with the part of the outer layer of the alumina powder particles during high-temperature heat treatment, and enables the outer layer of the alumina powder to be melted and recrystallized at a temperature lower than that of pure alumina, thereby sealing the surface of the alumina powder. The inside of the filler matrix is provided with holes, and the outer layer is compact and sealed, so that the filler matrix has the performance of lower density and light weight, and also has higher strength and water resistance, the holes are prevented from becoming water treeing ageing channels, and the water treeing ageing resistance of the insulating layer is further provided.
Meanwhile, the anti-hydration filler prepared by taking aluminum oxide as a raw material also has the capability of improving the insulativity and the flame retardance of the insulating layer, so that the anti-aging, insulating and flame retardance of the cable are improved.
Preferably: the doping method of the cosolvent comprises the following steps:
t1: soaking alumina powder in a calcium salt solution, and filtering to obtain wet alumina powder after the alumina powder is fully absorbed;
t2: adding and dispersing wet alumina powder into a sodium silicate solution, filtering to obtain plugging alumina powder after the reaction is complete; t3: and (3) carrying out high-temperature heat treatment on the plugging alumina powder in a non-oxidizing atmosphere at the treatment temperature of 500-1000 ℃, and obtaining the alumina powder doped with the fluxing agent after dehydration and decomposition are completed.
By adopting the technical scheme, calcium ions are firstly infiltrated into the alumina powder particles, the calcium ions in the alumina powder particles are combined by silicate ions and are converted into gel or deposited and attached in the alumina powder particles, and then the gel or deposited and attached in the alumina powder particles are dehydrated at high temperature to be converted into the mixture of calcium silicate, dicalcium silicate and tricalcium silicate.
The flux attached to the powder can be mixed with the alumina powder more deeply and more uniformly, which is favorable for the generation of eutectic to promote the surface melting recrystallization of the water-tree resistant filler, and the flux attached to the powder is attached to the holes of the alumina powder particles, is not easy to separate from the alumina powder particles and is not easy to gather when the flux is melted at high temperature and does not form the eutectic, so that the water-tree resistant filler with the required micron-sized particle size and below can be obtained based on the flux.
Preferably: the concentration of the sodium silicate solution is 6-10wt%.
By adopting the technical scheme, the excessive concentration of silicate can lead calcium ions on the surface of the alumina powder and at the end parts of the holes to be quickly converted into calcium silicate, then the holes are closed, the further deep part of calcium ion conversion in the holes is blocked, the final fluxing agent is not sufficiently doped, the melting recrystallization effect is not good, and the water tree resistance effect of the insulating layer is not sufficiently improved;
the concentration of silicate is too low, the reaction of calcium ions is converted and the holes are plugged for too long, the calcium ions in the alumina powder particles are diffused outside the alumina powder particles, the obtained fluxing agent is only partially adhered to the surface of the alumina, deeper and more uniform mixing with the alumina powder can not be realized, and the water-tree-resistant effect of the insulating layer is not improved.
Preferably: the concentration of the calcium salt solution is 25-30wt%.
By adopting the technical scheme, the alumina powder soaked in the concentration has enough calcium ions absorbed therein, enough flux is formed by conversion, and the surface of the water-tree-resistant filler is melted, recrystallized and densified. Too high a concentration of calcium salt solution is too costly and tends to close the alumina powder particle pores too fast, impeding the conversion of calcium ions into further portions of the pores.
Preferably: the water tree resistant filler is the filler matrix modified by organosilane.
Preferably: the organosilane modification is an epoxy organosilane modification.
By adopting the technical scheme, the compatibility of the water-tree-resistant filler and the crosslinked polyethylene can be improved, and the water-tree-resistant filler can be uniformly dispersed.
Preferably: the dosage of the water tree resistant filler is 22-24 parts.
By adopting the technical scheme, the compatibility of the water-tree-resistant filler and the crosslinked polyethylene is improved based on the modification of the epoxy organosilane, and more water-tree-resistant filler can be added under the conditions that the extrusion of the insulating layer is normally carried out and the indexes such as hardness and softness reach the standard, so that the ageing resistance and the insulativity are further enhanced.
Preferably: the grain diameter of the water tree resistant filler is 10-30 mu m.
By adopting the technical scheme, the production process of the nano-scale anti-hydration filler has high difficulty, and the micro-scale anti-hydration filler is selected to be better under the remarkable effect brought by the micro-scale anti-hydration filler; at the same time, the nano filler has electron holes, has activation effect on free radicals in organisms, and can reduce ageing resistance.
In summary, the application has the following beneficial effects:
the surface of the water tree filler is doped with the fluxing agent of the mixture of calcium silicate, dicalcium silicate and tricalcium silicate, and the outer layer of the aluminum oxide powder is melted and recrystallized at a temperature lower than that of pure aluminum oxide, so that the surface of the aluminum oxide powder is sealed, holes are prevented from becoming water tree aging channels, and the ageing resistance, the insulativity and the flame retardance of the cable are improved.
Detailed Description
Preparation example 1
The preparation method of the water tree resistant filler comprises the following steps:
t1: immersing 100kg of alumina powder with the particle size of 10-30 mu m in 28wt% calcium chloride solution, stirring thoroughly without generating bubbles, continuously immersing for 1h, and filtering to obtain wet alumina powder;
t2: adding and stirring the wet alumina powder, dispersing the wet alumina powder in 8wt% sodium silicate solution, stopping stirring, standing and soaking for 1.5 hours, and filtering to obtain the plugging alumina powder;
t3: carrying out high-temperature heat treatment on the plugging alumina powder in a nitrogen atmosphere at a treatment temperature of 720 ℃ for 1.2h to obtain blended powder; wherein the treatment temperature is not lower than 500 ℃ so that free water and crystal water in the plugging alumina powder are removed, and the treatment temperature is not higher than 1000 ℃ so as to avoid powder sintering and caking, and the treatment temperature and the treatment time are adjusted according to the amount of single-batch plugging alumina powder;
t4: carrying out high-temperature heat treatment on the mixed powder in nitrogen atmosphere under a nitrogen blowing drum, wherein the treatment temperature is 1610 ℃, the treatment time is 45min, cooling, screening the particle size, and taking 10-30 mu m as a filler matrix;
t5: immersing a filler matrix in silane modified liquid, carrying out ultrasonic treatment for 40min, taking out and drying to obtain the water-tree-resistant filler, wherein the silane modified liquid is prepared from silane coupling agent and isopropanol according to a mass ratio of 1:80, and the ultrasonic frequency is 70kHz.
The silane coupling agent in preparation example 1 was gamma-glycidoxypropyl triethoxysilane (KH-561).
PREPARATION EXAMPLES 2 to 13
The process parameters of the water-tree-resistant filler during the preparation method are different from those of the preparation example 1, and the specific differences are shown in the table 1 below.
TABLE 1 partial Process parameter Table for Water Tree resistant Filler of preparation examples 1-13
PREPARATION EXAMPLE 14
The filler is different from the preparation example 1 in that the surface modification of T5 is not carried out on the filler matrix, and the filler matrix obtained by T4 is used as the filler for resisting the hydration of the water tree.
Preparation example 15
The water tree resistant filler is different from the preparation example 1 in that the alumina powder with the diameter of 1-5 mu m is selected as T1, and the particle size of the filler matrix in T4 is selected as 1-5 mu m.
The research and development process of the application also has partial research schemes on the water-tree-resistant filler, and the specific research examples 1-3 are as follows.
Study example 1
A filler test article is prepared by the following steps:
uniformly mixing alumina powder with the thickness of 10-30 mu m and calcium silicate powder with the thickness of 0.5-1 mu m according to the mass ratio of 10:1, and then performing heat treatment in a nitrogen protection atmosphere at the temperature of 1550 ℃ for 45min.
The material after cooling treatment has a large amount of hardening and caking conditions, namely, the difference between the particle diameters of the calcium silicate and the alumina is too large, so that the calcium silicate and the alumina are mixed unevenly, the calcium silicate is melted at high temperature, and then salt alumina particles are concentrated together, and then surrounding alumina powder is hardened and agglomerated.
According to the study example 1, according to the application, calcium ions are permeated into alumina powder particles, and then alumina powder doped with fluxing agent is obtained through silicate ion conversion and high-temperature dehydration steps, so that fluxing agent can be deeply and uniformly mixed with the alumina powder, the generation of eutectic agent is facilitated, the surface melting recrystallization of the water-tree-resistant filler is promoted, the attached fluxing agent is attached into holes of the alumina powder particles, and the required water-tree-resistant filler can be obtained based on the fact that the aluminum powder particles are not easy to separate and aggregate when the eutectic agent is melted at high temperature.
Study example 2
A filler test article is distinguished from preparation example 1 in that the heat treatment temperature in the T4 step is 1850 ℃.
Study example 2 was prepared according to the preparation method, and the mass of the material obtained in step T4 was agglomerated and unusable due to the fact that xcao.sio2 and the eutectic were too viscous at too high a temperature, oozed out of the powder and converged during the heat treatment. So the heat treatment temperature in the step T4 is not easy to be too high.
Study example 3
A filler test article is different from preparation example 1 in that 200.+ -.10 nm of alumina powder is selected in the step T1.
Study example 3 was carried out according to the preparation method, and the material obtained in step T4 was sintered and agglomerated in large amounts and was not usable.
Example 1
An anti-aging insulating flame-retardant power cable comprises a battery core, an insulating layer and a sheath.
The cell is here a strand and has a nominal cross sectionIs 240mm 2 ；
The insulating layer is wrapped outside the conductor structure, and the nominal thickness of the insulating layer is 1.7mm;
the sheath is wrapped outside the insulating layer, and the nominal thickness of the sheath is 1.8mm;
the cable was approximately 26mm in diameter.
The insulating layer is formed by uniformly mixing raw materials in a screw extruder, and extruding and packaging the raw materials outside the battery cell through an extruder. The insulating layer comprises the following raw materials in parts by mass:
100 parts of low-density linear polyethylene;
1.5 parts of cross-linking agent;
0.42 parts of antioxidant;
22 parts of water tree resistant filler.
The low-density linear polyethylene is compounded by sauter sabic 318B and American Dow 352E according to a mass ratio of 1:0.8.
The cross-linking agent is trimethylolpropane triacrylate.
The antioxidant is compounded by antioxidant B215 and antioxidant 1010 according to the mass ratio of 1:1.1.
The water-tree resistant filler was obtained from preparation example 1.
Examples 2 to 15
An anti-aging insulated flame retardant power cable differs from example 1 in that the source of the water-tree resistant filler is different, with the specific differences being shown in table 2 below.
TABLE 2 partial raw materials consumption and parameters Table for examples 1 to 15
Comparative example 1
A cable differing from example 1 in that no water-tree-resistant filler is added to the material of the insulating layer.
Comparative example 2
A cable is distinguished from example 1 in that the water-tree-resistant filler is replaced by an equal mass of commercially available 10-30 μm alumina powder in the raw material of the insulating layer.
The cable insulation layers and insulation layer materials obtained in examples 1 to 15 and comparative examples 1 to 2 were tested, and insulation resistance test was performed according to GB/T17737.1; according to the insulating resistance test after hydrolysis simulation of GB/T17737.1 and GB/T2951.21, the hydrolysis temperature is 60 ℃ and the hydrolysis time is 1440h; flame retardant performance testing was performed according to UL 94. The results of the measurements are shown in Table 3 below.
TABLE 3 detection results of examples 1 to 15 and comparative examples 1 to 2
From tables 2 and 3, comparative examples 1, 3, 4 and comparative example 1 show that the insulation resistance of the cable of the present application is higher and the insulation resistance decay after water-treeing is significantly smaller than that of comparative example 1, compared with comparative example 1, to which no water-treeing resistant filler is added. Meanwhile, the insulating layer of the cable has good flame retardant property.
Meanwhile, as can be seen from comparative examples 1 and 2, the water-tree-resistant filler added in the insulating layer is different from alumina and is different from calcium silicate mixed alumina, sintered and crushed to obtain the powder filler, and the water-tree-resistant filler is doped with a fluxing agent of a mixture of calcium silicate, dicalcium silicate and tricalcium silicate on the surface of alumina powder particles, has a low melting point, is melted first and forms a eutectic with part of the outer layer of the alumina powder particles during high-temperature heat treatment, and enables the outer layer of the alumina powder to be melted and recrystallized at a temperature lower than that of pure alumina so as to seal the surface of the alumina powder. The filler matrix is internally provided with holes. The outer layer is compact and closed, has higher strength and water resistance while being low in density and light in weight, and avoids holes from becoming water treeing ageing channels, so that the water treeing ageing resistance of the insulating layer is further improved, and the ageing resistance of the cable is improved.
Comparative examples 1 to 5, which are different in the concentration of the calcium salt used in the preparation of the water-tree-resistant filler, are different in that the concentrations of the calcium salt used in examples 2, 3, 1, 4 and 5 are increased, and as can be seen from Table 3, the insulation resistances before and after hydrolysis of examples 1, 3 and 4 are superior to those of examples 2 and 5, because the insufficient amount of calcium ions available for conversion is caused by the too low concentration of the calcium salt, the insufficient amount of the flux is caused, and the too high concentration of the calcium salt causes too fast formation of calcium silicate to close the pores of the alumina powder particles too early, resulting in the insufficient amount of the final flux, and the too high and too low concentration of the calcium salt are unfavorable for the improvement of the water-tree-resistant filler effect, and the 25 to 30wt% is preferable.
Comparative examples 1 and examples 6 to 9, wherein the difference is that the silicate concentration used in the preparation of the water tree resistant filler is different, the silicate concentration used in examples 6, 7, 1, 8 and 9 is increased, and as can be seen from Table 3, the insulation resistance before and after hydrolysis of examples 1, 7 and 8 is superior to that of examples 6 and 9, because the silicate concentration is too high, calcium ions on the surface of the alumina powder and at the end of the holes are rapidly converted into calcium silicate, and then the holes are blocked, the further deep calcium ion conversion in the holes is hindered, and finally the flux is not sufficiently doped; the concentration of silicate is too low, the reaction of calcium ions is converted and the time for plugging holes is too long, the calcium ions in the alumina powder particles are diffused outside the alumina powder particles, the obtained fluxing agent is only adhered to the surface of the alumina, deeper and more uniform mixing with the alumina powder cannot be realized, and finally, the silicate concentration with too high or too low concentration is not beneficial to improving the water-tree-resistant effect of the insulating layer, and is better in selection of 6-10wt%.
Comparing examples 1 and 10-12, examples 10, 11, 1 and 12, the heat treatment temperature of the T4 step is increased one by one, the insulation resistance is increased one by one before hydrolysis and the insulation resistance is reduced after hydrolysis, so that the heat treatment temperature of the T4 step is preferably 1580-1700 ℃ in combination with the insulation resistance values before and after hydrolysis of examples 10-12 and research example 2.
Comparative examples 1, 13, 14, example 1 had better insulation resistance before hydrolysis than example 13, and example 13 had better insulation resistance before hydrolysis than example 14; the insulation resistance attenuation ratio after hydrolysis of the embodiment 1 is smaller than that of the embodiment 13, and the insulation resistance attenuation ratio after hydrolysis of the embodiment 13 is smaller than that of the embodiment 14, and the hydrolysis-resistant filler is subjected to silane modification, so that the hydrolysis-resistant filler is dispersed in crosslinked polyethylene, the synergistic effect of the hydrolysis-resistant filler is provided, and epoxy silane modification is preferred.
Comparing example 1 with example 15, the insulation resistance before hydrolysis of example 1 is better than that of example 15, the insulation resistance attenuation ratio after hydrolysis of example 1 is smaller than that of example 15, and meanwhile, as can be seen from the combination of research example 3, the difficulty in preparing nano-scale water-tree-resistant filler in the application is large, and the effect is not as good as that of micron-scale water-tree-resistant filler, so that the water-tree-resistant filler in the application is better than 10-30 mu m.
Example 16
An anti-aging insulated flame-retardant power cable is different from example 1 in that the insulating layer comprises the following raw materials in parts by mass: 100 parts of low-density linear polyethylene; 1.5 parts of cross-linking agent; 0.42 parts of antioxidant; 15 parts of water tree resistant filler.
Example 17
An anti-aging insulated flame-retardant power cable is different from example 1 in that the insulating layer comprises the following raw materials in parts by mass: 100 parts of low-density linear polyethylene; 1.5 parts of cross-linking agent; 0.42 parts of antioxidant; 18 parts of water tree resistant filler.
Example 18
An anti-aging insulated flame-retardant power cable is different from example 1 in that the insulating layer comprises the following raw materials in parts by mass: 100 parts of low-density linear polyethylene; 1.5 parts of cross-linking agent; 0.42 parts of antioxidant; 24 parts of water tree resistant filler.
Example 19
An anti-aging insulated flame-retardant power cable is different from example 1 in that the insulating layer comprises the following raw materials in parts by mass: 100 parts of low-density linear polyethylene; 1.2 parts of cross-linking agent; 0.58 parts of antioxidant; 15 parts of water tree resistant filler.
The low-density linear polyethylene is compounded by sauter sabic 318B and American Dow 352E according to a mass ratio of 1:1.
The cross-linking agent is trimethylolpropane triacrylate.
The antioxidant is compounded by antioxidant B215 and antioxidant 1010 according to the mass ratio of 1:1.
The water-tree resistant filler was obtained from preparation example 1.
Example 20
An anti-aging insulated flame-retardant power cable is different from example 1 in that the insulating layer comprises the following raw materials in parts by mass: 100 parts of low-density linear polyethylene; 2.1 parts of cross-linking agent; 0.58 parts of antioxidant; 24 parts of water tree resistant filler.
The low-density linear polyethylene is compounded by sauter sabic 318B and American Dow 352E according to a mass ratio of 1:1.3.
The cross-linking agent is trimethylolpropane triacrylate.
The antioxidant is compounded by antioxidant B215 and antioxidant 1010 according to the mass ratio of 1:0.8.
The water-tree resistant filler was obtained from preparation example 1.
The cable insulation layers and insulation layer materials obtained in examples 16 to 20 were tested, and the test results are shown in table 4 below.
TABLE 4 detection results Table for examples 16 to 20
As can be seen from tables 3 and 4, comparative examples 16 to 18 and comparative example 2, the insulation resistances of examples 16 to 18 were superior to comparative example 2, and the insulation resistance decay ratio after hydrolysis was smaller than comparative example 2.
The amounts of the anti-hydration fillers used in examples 16 to 18 and example 1, examples 16, 17, example 1 and example 18 were increased gradually, and the insulation resistance attenuation ratio after hydrolysis was decreased gradually; when the amount of the filler is 22 parts by mass, the reduction trend of the insulation resistance attenuation ratio after hydrolysis is slowed down, so that the amount of the hydrolysis-resistant filler is 15-24 parts, and the amount of the hydrolysis-resistant filler is preferably 22-24 parts.
As is clear from tables 3 and 4, the insulating layer insulation resistance constants of comparative examples 19, 20 and comparative examples 1 to 2, examples 19, 20 are superior to those of the insulating layer with or without the addition of the alumina filler alone, and are superior to those of the insulating layer with or without the addition of the alumina filler alone in terms of aging resistance.
The present embodiment is only for explanation of the present application and is not to be construed as limiting the present application, and modifications to the present embodiment, which may not creatively contribute to the present application as required by those skilled in the art after reading the present specification, are all protected by patent laws within the scope of claims of the present application.

Claims (8)

1. The anti-aging insulating flame-retardant power cable is characterized by comprising a battery cell and an insulating layer wrapping the battery cell, wherein the insulating layer is prepared from the following raw materials in parts by mass: 100 parts of low-density linear polyethylene, 1.2-2.1 parts of cross-linking agent and 15-24 parts of water-tree-resistant filler;
the anti-hydration filler comprises a filler matrix, wherein the filler matrix is obtained by doping fluxing agent on the surface of alumina powder and re-melting and re-crystallizing the surface; the fluxing agent is a mixture of calcium silicate, dicalcium silicate and tricalcium silicate.
2. The anti-aging insulated flame retardant power cable of claim 1, wherein the co-solvent is incorporated by the following method:
t1: soaking alumina powder in a calcium salt solution, and filtering to obtain wet alumina powder after the alumina powder is fully absorbed;
t2: adding and dispersing wet alumina powder into a sodium silicate solution, filtering to obtain plugging alumina powder after the reaction is complete;
t3: and (3) carrying out high-temperature heat treatment on the plugging alumina powder in a non-oxidizing atmosphere at a treatment temperature of 500-1000 ℃, and obtaining the alumina powder doped with the fluxing agent after dehydration and decomposition are completed.
3. The anti-aging insulated flame retardant power cable according to claim 2, wherein the concentration of the sodium silicate solution is 6-10wt%.
4. The anti-aging insulated flame retardant power cable according to claim 3, wherein the calcium salt solution has a concentration of 25-30wt%.
5. The anti-aging, insulating, flame retardant power cable of claim 1, wherein the water tree resistant filler is an organosilane modified filler matrix.
6. The anti-aging, insulating, flame retardant power cable of claim 2, wherein the organosilane modification is an epoxy organosilane modification.
7. The anti-aging insulated flame-retardant power cable according to claim 6, wherein the amount of the water-tree-resistant filler is 22-24 parts.
8. The anti-aging insulated flame-retardant power cable according to claim 1, wherein the water-tree-resistant filler has a particle size of 10-30 μm.
CN202310794057.2A 2023-06-30 2023-06-30 Anti-aging insulating flame-retardant power cable Pending CN116675927A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310794057.2A CN116675927A (en) 2023-06-30 2023-06-30 Anti-aging insulating flame-retardant power cable

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310794057.2A CN116675927A (en) 2023-06-30 2023-06-30 Anti-aging insulating flame-retardant power cable

Publications (1)

Publication Number Publication Date
CN116675927A true CN116675927A (en) 2023-09-01

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310794057.2A Pending CN116675927A (en) 2023-06-30 2023-06-30 Anti-aging insulating flame-retardant power cable

Country Status (1)

Country Link
CN (1) CN116675927A (en)

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