CN115449156A - Thermoplastic luminous self-cooling insulating material for overhead insulated cable and preparation method and application thereof - Google Patents
Thermoplastic luminous self-cooling insulating material for overhead insulated cable and preparation method and application thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/10—Homopolymers or copolymers of propene
- C08L23/12—Polypropene
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L53/00—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—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
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- C—CHEMISTRY; METALLURGY
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- 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 invention relates to a thermoplastic luminous self-cooling insulating material for an overhead insulated cable, which comprises the following components in parts by weight: matrix resin, an antioxidant, an ultraviolet-resistant absorbent, a coupling agent, a heat-conducting filler and a thermoluminescent material. The invention also discloses a preparation method and application of the thermoplastic luminous self-cooling insulating material for the overhead insulated cable. The insulating material disclosed by the invention keeps the high-temperature resistance characteristic of polypropylene, solves the problems of poor low-temperature toughness and easiness in aging of the material used as a wire and cable material, has better thermal conductivity and low-temperature rise effect, can be used for insulating an overhead cable, can well transfer the heat of a conductor in a radial direction and can be converted and released through a thermoluminescent material, so that the insulating temperature rise is reduced, the service life of the cable is prolonged, and the current-carrying capacity is higher.
Description
Technical Field
The invention relates to the field of wire and cable insulating materials, in particular to a thermoplastic luminous self-cooling insulating material for an overhead insulated cable, and a preparation method and application thereof.
Background
An overhead insulated cable is a conductor with an insulating layer formed by twisting single-layer or multi-layer aluminum strands together. Compared with a bare conductor, the aerial insulated cable has the advantages that the insulating layer is added outside, so that the inter-phase distance between aerial insulated cable lines can be shortened, the occupation of space dimensionality is reduced, the better protection effect is realized on the conductor, and the service life of the conductor is prolonged. Along with the pace of the transformation and upgrading of national power distribution network lines is accelerated, the application of the overhead insulated cable is wider and wider, the overhead insulated cable not only passes through the street and the roadway, but also is erected in a plurality of complicated areas, and the requirement on insulation is higher and higher. Two types of insulation materials are currently used for overhead insulated cables: firstly, a crosslinked polyethylene (XLPE) insulating material is adopted, and a cable prepared by the XLPE needs to be crosslinked, so that the crosslinking process has the advantages of high energy consumption, relatively complex process and low efficiency; and the crosslinked XLPE meets the use requirement of long-term working temperature of 90 ℃, but the environmental hazard of crosslinking byproducts is large, the crosslinked resin belongs to thermosetting resin, and the cable cannot be recycled after being discarded, thereby causing secondary damage to the environment. Secondly, high Density Polyethylene (HDPE) insulating material is adopted, the long-term service temperature is only 75 ℃, so that the temperature of the overhead insulated conductor is limited, the current-carrying capacity is insufficient, and the electric energy transmission efficiency is reduced. Therefore, the development of the thermoplastic insulating material for the overhead insulated cable, which has high temperature resistance, good weather resistance and environmental friendliness, has good market application prospect.
The polypropylene (PP) is a thermoplastic resin, the melting point of the resin per se reaches more than 150 ℃, is about 40 to 50 percent higher than that of polyethylene, the long-term working temperature can reach 105 ℃, and the good heat resistance as insulation has important significance for improving the working temperature of a conductor and the current-carrying capacity of a cable. PP has higher breakdown field intensity, the nonpolar and non-hydrophilic characteristics of PP, and the insulating property of PP is slightly influenced by the environmental humidity. The PP has excellent electrical and heat-resistant properties, meets the development requirements of environmental protection and recoverability on insulating materials, and draws wide attention in the field of wires and cables.
PP has the characteristics of high tensile strength, high modulus and insufficient toughness due to high molecular structure regularity, high crystallinity and large grain size. Compared with the performance requirement of the insulating material for the GB/T14049-2008 overhead insulated cable, the PP is modified by a proper material formula combination to meet the use requirement.
Disclosure of Invention
The invention provides a thermoplastic luminous self-cooling insulating material for an overhead insulated cable, and a preparation method and application thereof, aiming at the problems in the prior art.
A thermoplastic luminous self-cooling insulating material for an overhead insulated cable is characterized in that, by weight,
preferably, the matrix resin includes 70 to 90 parts of polypropylene resin and 10 to 30 parts of elastomer.
Preferably, the polypropylene resin is selected from one or more of homo-polypropylene (PPH) resin, random polypropylene (PPR) or block co-polypropylene (PPB).
Preferably, the polypropylene resin Melt Index (MI) is: 2-10g/min (230 ℃,2.16 kg);
preferably, the ethylene content of the PPB is 15-30wt%.
Preferably, the elastomeric resin is one or more of Ethylene Propylene Rubber (EPR), ethylene propylene diene monomer rubber (EPDM) or ethylene-octene copolymer (POE).
Preferably, the antioxidant is one or more of 1010, 168, 300.
The chemical name of the antioxidant 1010 is: the tetra [ beta- (3,5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester is white crystalline powder, has stable chemical properties, and can be widely applied to the industries of general plastics, engineering plastics, synthetic rubber, fiber, hot melt adhesive, resin, oil products, ink, paint and the like.
The antioxidant 168 is a phosphite antioxidant with excellent performance, has strong extraction resistance and stable hydrolysis, can obviously improve the light stability of products, and can be compounded with various phenol antioxidants for use. For example, cyanox2777, developed by Cyanamid corporation, U.S. is a combination of antioxidant 168 and phenolic antioxidant 1790. Phosphite ester and phenol antioxidant are compounded for use, so that the synergistic effect can be fully exerted, phosphite ester in the components is auxiliary antioxidant, the long-term stabilization effect cannot be achieved, and a better compounding effect is obtained after the phosphite ester and hindered phenol are compounded, so that the phosphite ester can be used for various polymers.
The antioxidant 300 is a typical thiobis phenolic antioxidant. As the hindered phenol main antioxidant, the hindered phenol main antioxidant has double functions of a radical terminator and a hydroperoxide decomposer due to the structural particularity, and is suitable for polyolefin, polyester, polystyrene, ABS resin, polyvinyl chloride and the like.
Preferably, the anti-ultraviolet absorber is two or more of UV-9, UV327, UV-531, UV-0.
The ultraviolet absorbent UV-9 (BP 3) is a benzophenone high-efficiency absorbent, can effectively absorb ultraviolet light of 270-340 nm, hardly absorbs visible light, is suitable for paint and various plastic products, and is particularly effective for polyvinyl chloride, polystyrene, polyurethane, acrylic resin, light-colored transparent furniture and the like.
Ultraviolet absorber UV-327, having the name 2- (2 ' -hydroxy-3 ',5' -di-tert-butylphenyl) -5-chlorobenzotriazole; 2- (2 ' -hydroxy-3 ',5' -di-tert-butylphenyl) -5-chlorobenzotriazole; UV absorber-327; an ultraviolet absorber 327;2,4-di-tert-butyl-6- (5-chlorobenzotriazol-2-yl) phenol. It is especially suitable for polyethylene and polypropylene, and may be also used in polyformaldehyde, polymethyl methacrylate, polyurethane and various kinds of paint.
The ultraviolet absorbent UV-531 is named as 2-hydroxy-4-n-octoxy benzophenone with chemical name, is a high-efficiency anti-aging auxiliary agent with excellent performance, can absorb ultraviolet light of 240-340 nanometers, has the characteristics of light color, no toxicity, good compatibility, small mobility, easy processing and the like, has the maximum protection effect on polymers, is beneficial to reducing color and luster, and simultaneously delays yellowing and retards physical property loss.
Ultraviolet absorbent UV-0, its name is 2,4-dihydroxy benzophenone; benzophenone-1; 2,4-dihydroxybenzophenone; ultraviolet absorbent UV-0;2,4-dihydroxybenzophenone; BP-1;2,4 dihydroxybenzophenone; and (5) UV-0. The compound is mainly used as a light stabilizer for plastics and the like, can effectively protect organic glass and cloth, prevents data and the like from being deteriorated due to illumination, and is also used as an intermediate for synthesizing other ultraviolet absorbers.
Preferably, the coupling agent is a titanate coupling agent.
The titanate coupling agent has good coupling effect in filler systems such as thermoplastic plastics, thermosetting plastics, rubber and the like. Titanate coupling agents can be broadly classified into four types according to their structure: monoalkoxy type, monoalkoxy pyrophosphate type, integral type, and ligand type. The structural general formula of the monoalkoxy coupling agent is RO-Ti (OX-R-Y) 3 . A representative variety is isopropyl Triisostearoyl Titanate (TTS), which is suitable for calcium carbonate fillers.
Preferably, the heat conductive filler is SiO 2 Powder with the grain diameter of 100 nm-10 um.
Preferably, the thermoluminescent material is aluminate luminescent powder SrAl 2 O 4 :Eu 2+ ,Dy 3+ Or CaAlO 4 :Eu 2+ ,Nd 3+ One or more of (a). SrAl 2 O 4 :Eu 2+ ,Dy 3+ The luminescent material with the best long afterglow performance in the prior aluminate system is widely applied to the fields of printing industry, coating, ceramics, textiles and the like due to the advantages of high luminous intensity, long afterglow time, stable chemical properties, no pollution and the like. CaAlO 4 :Eu 2+ ,Nd 3+ Is a novel, stable and efficient blue-violet long afterglow luminescent material. The material has the advantages of long afterglow time, high luminous brightness, good chemical stability, no radiation, no toxicity and the like, has wide application value in the fields of low-light illumination, night vision, indication and the like, and also shows attractive prospect in the fields of information storage, high-energy detection and the like.
The invention also provides a preparation method of the thermoplastic luminous self-cooling insulating material for the overhead insulated cable, which comprises the following steps:
1) Putting the components into a closed mixer according to the proportion, and carrying out high-speed rotary mixing to obtain a mixture;
2) Extruding and granulating the mixture obtained in the step 1) to obtain the insulating material.
Preferably, in the step 1), the rotating speed is 400-500 rpm;
preferably, in step 1), the mixing time is 10-15min.
Preferably, in step 2), the extrusion apparatus is a twin-screw extruder.
Preferably, the length-diameter ratio L/D of the screw extruder of the double-screw extruder is 100-150;
preferably, the temperature distribution of each section of the screw is as follows in sequence: a first zone, 120 +/-10 ℃; a second zone, 150 +/-10 ℃; three zones, 195 +/-10 ℃; four zones, 205 +/-10 ℃; five zones, 205 +/-10 ℃; six areas, 205 plus or minus 10 ℃; seven zones, 205 +/-10 ℃; eight regions, 205 +/-10 ℃; nine areas, 205 +/-10 ℃; ten areas, 200 plus or minus 10 ℃; eleven regions, 200 + -10 deg.C; a machine head, 195 +/-10 ℃;
preferably, the twin screw extruder speed is 80 to 150 revolutions per minute.
The invention also provides the application of the thermoplastic luminous self-cooling insulating material for the overhead insulated cable in the cable.
The invention has the following beneficial effects:
the invention is prepared by selecting proper matrix resin formula combination, proper antioxidant, reasonable anti-ultraviolet absorber proportion, proper coupling agent and heat-conducting filler combination, and pyroelectric luminescent powder with better visual perception, and adopting a double-screw extruder with larger length-diameter ratio for melt blending. The insulating material disclosed by the invention keeps the high-temperature resistance characteristic of polypropylene, solves the problems of poor low-temperature toughness and easiness in aging of the material used as the wire and cable, has better thermal conductivity and low-temperature rise effect, can be used for insulating an overhead cable, can well transfer the heat of a conductor in a radial direction and can convert and release the heat through the thermoluminescent material, so that the insulating temperature rise is reduced, the service life of the cable is prolonged, and the current-carrying capacity is further improved. Compared with XLPE, the thermoplastic luminous self-cooling insulating material has excellent mechanical property and electrical property, can meet the use requirement of long-term working temperature of 90 ℃ or even higher temperature without crosslinking, is easy to process, gives different visual perception to the area at night due to self-luminescence of thermoluminescence after the cable is meshed for operation, is easy to recycle after the service life of the cable is terminated, and reduces the environmental pressure.
Detailed Description
The following embodiments of the present invention are provided by way of specific examples, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
It is to be understood that the processing equipment or apparatus not specifically identified in the following examples is conventional in the art.
Example 1:
step 1): 100 portions of homopolymerized polypropylene (PPH) and ethylene propylene diene monomer(EPDM) mixture (PPH/EPDM = 70/30), 0.4 part of antioxidant (1010/168 = 3/1) mixture, 0.4 part of anti-UV absorber (UV-531/UV-0=1/1), 0.8 part of coupling agent, 1.5 parts of thermally conductive filler SiO 1 2 Powder, 1.0 part of thermoluminescent powder SrAl 2 O 4 :Eu 2+ ,Dy 3 Placing in a closed mixer for uniform mixing at a rotation speed of 450 rpm for 15min.
Step 2): the mixture is automatically sent to a double-screw extruder to be subjected to melt blending extrusion and cooling granulation, and the temperature of each area of the screw is as follows: a first zone, 120 ℃; a second zone, 150 ℃; three zones, 195 ℃; four areas, 200 ℃; five zones, 205 ℃; a sixth zone, 205 ℃; seven zones, 205 ℃; eight regions, 205 ℃; nine zones, 205 ℃; ten areas, 200 ℃; eleven regions, 200 ℃; head, 195 deg.C, main machine rotation speed 100 rpm.
Example 2:
step 1): 100 parts of a mixture of homo-polypropylene (PPH) and ethylene-octene copolymer (POE) (PPH/POE = 70/30), 0.4 part of an antioxidant (1010/168 = 3/1) mixture, 0.4 part of an ultraviolet resistant absorbent (UV-531/UV-0=1/1), 0.8 part of a coupling agent, and 1.5 parts of a heat conductive filler SiO 2 Powder, 1.0 part of thermoluminescent powder SrAl 2 O 4 :Eu 2+ ,Dy 3 Placing in a closed mixer for uniform mixing at a rotation speed of 450 rpm for 15min.
Step 2): the mixture is automatically sent to a double-screw extruder to be melted, blended, extruded, cooled and granulated, and the temperature of each area of the screw is as follows: a first zone, 120 ℃; a second zone, 150 ℃; three zones, 195 ℃; four areas, 200 ℃; five zones, 205 ℃; a sixth zone, 205 ℃; seven zones, 205 ℃; eight zones, 205 ℃; nine zones, 205 ℃; ten areas, 200 ℃; eleven regions, 200 ℃; head, 195 deg.C, main machine rotation speed 100 rpm.
Example 3:
step 1): 100 parts of a mixture of block polypropylene (PPB) and ethylene-octene copolymer (POE) (PPB/POE = 80/20), 0.4 part of an antioxidant (168/300 = 1/1) mixture, 0.4 part of an anti-ultraviolet absorber (UV-531/UV-0=1/1), 0.8 part of a coupling agent, 1.5 parts of a heat-conducting filler SiO 2 Powder, 1.0 part of thermoluminescent powder SrAl 2 O 4 :Eu 2+ ,Dy 3 Placing in a closed mixer for uniform mixing at a rotation speed of 450 rpm for 15min.
Step 2): the mixture is automatically sent to a double-screw extruder to be subjected to melt blending extrusion and cooling granulation, and the temperature of each area of the screw is as follows: a first zone, 120 ℃; a second zone, 150 ℃; three zones, 195 ℃; four areas, 200 ℃; five zones, 205 ℃; a sixth zone, 205 ℃; seven zones, 205 ℃; eight zones, 205 ℃; nine zones, 205 ℃; ten areas, 200 ℃; eleven regions, 200 ℃; head, 195 deg.C, main machine rotation speed 100 rpm.
Example 4:
step 1): 100 parts of a mixture of homo-polypropylene (PPH), atactic polypropylene (PPR) and ethylene-octene copolymer (POE) (PPH/PPR/POE = 60/24/16), 0.4 part of an antioxidant 1010/300 mixture, 0.4 part of an ultraviolet resistant absorbent (UV-531/UV-0=1/1), 0.8 part of a coupling agent, and 1.5 parts of a heat-conducting filler SiO 2 Powder, 1.0 part of thermoluminescent powder SrAl 2 O 4 :Eu 2+ ,Dy 3 Placing in a closed mixer for uniform mixing at a rotation speed of 450 rpm for 15min.
Step 2): the mixture is automatically sent to a double-screw extruder to be subjected to melt blending extrusion and cooling granulation, and the temperature of each area of the screw is as follows: a first zone, 120 ℃; a second zone, 150 ℃; three zones, 195 ℃; four areas, 200 ℃; five zones, 205 ℃; a sixth zone, 205 ℃; seven zones, 205 ℃; eight zones, 205 ℃; nine zones, 205 ℃; ten areas, 200 ℃; eleven regions, 200 ℃; head, 195 deg.C, main machine rotation speed 100 rpm.
Example 5:
step 1): 100 parts of a mixture of homopolymerized polypropylene (PPH), block polypropylene (PPB) and ethylene-octene copolymer (POE) (PPH/PPB/POE = 60/20/20), 0.5 part of an antioxidant 1010/168/300 mixture, 0.5 part of an ultraviolet resistant absorbent (UV 9/UV-531/UV-0=2/2/1), 0.8 part of a coupling agent and 1.5 parts of a heat-conducting filler SiO 1 2 Powder, 1.0 part of thermoluminescent SrAl powder 2 O 4 :Eu 2+ ,Dy 3 Placing in a closed mixerThe mixture is evenly mixed, the rotating speed is 450 r/min, and the mixing time is 15min.
Step 2): the mixture is automatically sent to a double-screw extruder to be melted, blended, extruded, cooled and granulated, and the temperature of each area of the screw is as follows: a first zone, 120 ℃; a second zone, 150 ℃; three zones, 195 ℃; four areas, 200 ℃; five zones, 205 ℃; a sixth zone, 205 ℃; seven zones, 205 ℃; eight zones, 205 ℃; nine zones, 205 ℃; ten areas, 200 ℃; eleven regions, 200 ℃; head, 195 deg.C, main machine rotation speed 100 rpm.
Example 6:
step 1): 100 parts of a mixture of block polypropylene (PPB), random polypropylene (PPR) and ethylene-octene copolymer (POE) (PPB/PPR/POE = 70/20/10), 0.4 part of an antioxidant 1010/168/300 mixture, 0.6 part of an ultraviolet resistant absorbent (UV 9/UV-531/UV-0=1/1/1), 0.8 part of a coupling agent, and 1.5 parts of a heat-conducting filler SiO 2 Powder, 1.0 part of thermoluminescent powder SrAl 2 O 4 :Eu 2+ ,Dy 3 Placing in a closed mixer for uniform mixing at a rotation speed of 450 rpm for 15min.
Step 2): the mixture is automatically sent to a double-screw extruder to be melted, blended, extruded, cooled and granulated, and the temperature of each area of the screw is as follows: a first zone, 120 ℃; a second zone, 150 ℃; three zones, 195 ℃; four areas, 200 ℃; five zones, 205 ℃; a sixth zone, 205 ℃; seven zones, 205 ℃; eight zones, 205 ℃; nine areas, 205 ℃; ten areas, 200 ℃; eleven regions, 200 ℃; head, 195 deg.C, main machine rotation speed 100 rpm.
And (4) analyzing results:
the properties of the insulation materials prepared in examples 4, 5 and 6 are shown in Table 1. The obtained thermoplastic insulating material has the advantages of excellent mechanical property, good low-temperature toughness, excellent electrical property and excellent weather resistance, and can meet the use requirement of the insulating material for 10kV overhead insulated cables.
TABLE 1 Properties of thermoplastic insulation
The thermal conductivity test results of the insulation material prepared in example 5 are as follows: 0.67W/mK is 158% higher than that of PP, 0.26W/mK.
The insulating material prepared in the embodiment 5 is placed in an oven at 90 ℃ for 2h, and is placed in a darkroom, the material absorbs heat and emits light due to the luminescent material, and the heat of the overhead insulated cable prepared by the material during operation is converted into fluorescence to be released, so that the temperature of a conductor can be effectively transferred, the temperature rise of the cable insulation is slowed down, and the service life of the cable is prolonged.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. The thermoplastic light-emitting self-cooling insulating material for the overhead insulated cable is characterized by comprising the following components in parts by weight:
2. the thermoplastic foamable light-emitting self-cooling insulation material for the overhead insulated cable according to claim 1, wherein the matrix resin comprises 70 to 90 parts of polypropylene resin and 10 to 30 parts of elastomer resin.
3. The thermoplastic foamable self-cooling insulation material for the overhead insulated cable according to claim 2, wherein the polypropylene resin is selected from one or more of homo polypropylene (PPH) resin, random polypropylene (PPR) or block co-polypropylene (PPB); and/or the elastomer resin is one or more of Ethylene Propylene Rubber (EPR), ethylene Propylene Diene Monomer (EPDM) or ethylene-octene copolymer (POE).
4. The thermoplastic foamable self-cooling insulation material for the overhead insulated cable according to claim 3, which is characterized by comprising one or more of the following technical features:
1) The polypropylene resin has a Melt Index (MI) of: 2-10g/min (230 ℃,2.16 kg);
2) The ethylene content of the PPB is 15-30wt%.
5. The thermoplastic foamable self-cooling insulation material for the overhead insulated cable according to claim 1, which is characterized by comprising one or more of the following technical features:
1) The antioxidant is one or more of 1010, 168 and 300;
1) The ultraviolet resistant absorbent is one or more of UV-9, UV327, UV-531 and UV-0;
3) The coupling agent is a titanate coupling agent;
4) The heat-conducting filler is SiO2 powder with the particle size of 100 nm-10 um.
6. The thermoplastic luminous self-cooling insulating material for the overhead insulated cable according to claim 1, wherein the thermoluminescence material is aluminate luminescent powder SrAl 2 O 4 :Eu 2+ ,Dy 3+ Or CaAlO 4 :Eu 2+ ,Nd 3+ One or more of (a).
7. The preparation method of the thermoplastic foamable self-cooling insulating material for the overhead insulated cable according to any one of claims 1 to 6, which is characterized by comprising the following steps:
1) Putting the components into a closed mixer according to the proportion, and carrying out high-speed rotary mixing to obtain a mixture;
2) Extruding and granulating the mixture obtained in the step 1) to obtain the insulating material.
8. The preparation method of the thermoplastic foamable self-cooling insulating material for the overhead insulated cable according to claim 7, characterized by comprising one or more of the following technical characteristics:
1) In the step 1), the rotating speed is 400-500 r/min;
2) In the step 1), the mixing time is 10-15min;
3) In the step 2), the extrusion device is a double-screw extruder.
9. The preparation method of the thermoplastic foamable self-cooling insulating material for the overhead insulated cable according to claim 8, characterized by comprising one or more of the following technical characteristics:
1) The length-diameter ratio L/D of the screw extruder of the double-screw extruder is 100-150;
2) The temperature distribution of each section of the screw is as follows in sequence: a first zone, 120 +/-10 ℃; a second zone, 150 +/-10 ℃; three zones, 195 +/-10 ℃; four zones, 205 +/-10 ℃; five zones, 205 +/-10 ℃; six areas, 205 plus or minus 10 ℃; seven zones, 205 +/-10 ℃; eight regions, 205 +/-10 ℃; nine areas, 205 +/-10 ℃; ten areas, 200 plus or minus 10 ℃; eleven regions, 200 + -10 deg.C; a machine head, 195 +/-10 ℃;
3) The rotating speed of the screw extruder of the double-screw extruder is 80-150 r/min.
10. Use of the thermoplastic, luminescable, self-cooling insulation for overhead insulated cables according to any of claims 1-6 in electrical cables.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116199978A (en) * | 2023-02-21 | 2023-06-02 | 上海至正新材料有限公司 | Low-shrinkage thermoplastic polypropylene insulating material for medium-voltage cable and preparation method thereof |
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