CN110894320A - Method for improving charge characteristic of insulation space of polypropylene high-voltage direct-current cable - Google Patents
Method for improving charge characteristic of insulation space of polypropylene high-voltage direct-current cable Download PDFInfo
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- CN110894320A CN110894320A CN201911162704.8A CN201911162704A CN110894320A CN 110894320 A CN110894320 A CN 110894320A CN 201911162704 A CN201911162704 A CN 201911162704A CN 110894320 A CN110894320 A CN 110894320A
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- C08J3/20—Compounding polymers with additives, e.g. colouring
- C08J3/22—Compounding polymers with additives, e.g. colouring using masterbatch techniques
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- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2423/10—Homopolymers or copolymers of propene
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Abstract
The invention belongs to the technical field of high-voltage direct-current transmission equipment, and discloses a method for improving the insulation space charge characteristic of a polypropylene high-voltage direct-current cable. The method utilizes the steric hindrance effect of the free radical trapping agent, introduces traps with different energy level depths and densities into the insulating material, further inhibits space charges injected by an externally applied electric field, improves space charge accumulation, and further improves the insulating strength and the electric aging resistance of the polypropylene composite material.
Description
Technical Field
The invention belongs to the technical field of high-voltage direct-current transmission equipment, and particularly relates to a method for improving the charge characteristic of an insulation space of a polypropylene high-voltage direct-current cable.
Background
Due to technical and commercial advantages, the extruded insulated cable plays an important role in the fields of high-voltage direct-current transmission, urban power supply, ocean resource development and the like. However, the widely used crosslinked polyethylene cables introduce by-products during the crosslinking process, which leads to space charge build-up and accelerated insulation aging. In addition, the operating temperature limit of the crosslinked polyethylene cable cannot meet the requirement of future power transmission on higher performance of long-distance and large-capacity power transmission. In recent years, polypropylene has attracted much attention in the field of insulation research of high voltage direct current cables due to its excellent electrical properties and high melting point characteristics. Meanwhile, the polypropylene-based composite material has the advantages of no crosslinking, recycling and the like, so that the polypropylene-based composite material has wide application prospect in recyclable high-voltage direct-current transmission cables.
The electrical insulating property of the polypropylene composite material has important significance for the application of the polypropylene composite material in high-voltage direct-current cables. Under a high direct current electric field, impurity ionization, polar group polarization, electrode emission and charge injection can form space charge in a polymer, so that electric field distortion is caused, electric tree growth is promoted, and aging is accelerated. Notably, the free radicals (i.e., atoms, molecules, or ions with unshared valence electrons) generated by ionization, polarization, and degradation of the polymer insulation play a crucial role in the formation and transport of space charge. High temperature or high electric field can induce unstable tertiary hydrogen dehydrogenation in polypropylene, and the introduction of oxygen further accelerates the aging of polypropylene. These unpaired electrons make the radicals highly chemically reactive, which further exacerbates polymer degradation and introduces more impurities, resulting in an increase in space charge.
Currently, the use of doped inorganic nanofillers to suppress the accumulation of space charge is a more common method of improving polymer insulation. However, due to poor compatibility of the nanoparticles with polymers, difficulty in surface modification and the like, slightly high additive content may cause particle agglomeration and polypropylene matrix defects, and severely restrict engineering applications thereof. Therefore, how to adopt a new method to improve the space charge characteristic in the polypropylene-based insulating layer is a great subject for developing a novel recyclable high-voltage direct-current cable insulating material, and has important significance for engineering application thereof.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a method for improving the insulation space charge characteristic of a polypropylene high-voltage direct-current cable.
According to the technical scheme, the method for improving the insulation space charge characteristic of the polypropylene high-voltage direct-current cable comprises the following steps of carrying out melt blending and extrusion granulation on a polypropylene composite base material and a free radical trapping agent according to the following mass ratio to prepare the polypropylene-based high-voltage direct-current cable insulation material for improving the space charge characteristic by trapping free radicals:
85 parts of polypropylene
15 parts of ultra-low density polyethylene
0.1-0.5 part of free radical trapping agent
Further, the polypropylene is one or a mixture of isotactic polypropylene and syndiotactic polypropylene.
Further, the radical trap is a hindered amine stabilizer with a steric hindrance effect, and specifically is one of the radical trap 622, the radical trap 770 and the radical trap 944.
The preparation method of the material for improving the insulating space charge characteristic of the polypropylene high-voltage direct-current cable by the free radical trapping agent comprises the following steps:
fully mixing polypropylene, ultra-low density polyethylene and a free radical trapping agent according to the following mass parts to obtain a mixture:
85 parts of polypropylene
15 parts of ultra-low density polyethylene
0.1-0.5 part of free radical trapping agent;
and secondly, putting the mixture obtained in the step one into a blending granulator, melting and blending for a certain time at a certain temperature and a certain rotating speed, and then extruding and granulating to obtain the master batch.
Further, the polypropylene in the first step is one or a mixture of isotactic polypropylene and syndiotactic polypropylene.
Further, the radical scavenger in step one is a hindered amine stabilizer with steric hindrance effect, specifically, one of radical scavenger 622, radical scavenger 770, and radical scavenger 944.
Further, the temperature range of the second step is 170-190 ℃, the rotating speed is 30-50 r/min, and the blending time is 10-20 min.
Compared with the prior art, the invention has the following advantages:
1. according to the method for improving the insulating space charge characteristic of the polypropylene high-voltage direct-current cable by using the free radical trapping agent, traps with different energy level depths and densities can be introduced into an insulating material by using the steric hindrance effect of the free radical trapping agent, so that space charges injected by an externally applied electric field are inhibited, space charge accumulation is improved, and the insulating strength and the electric aging resistance of the polypropylene composite material are improved.
2. The method for improving the insulation space charge characteristic of the polypropylene high-voltage direct-current cable based on the free radical trapping agent can further improve the heat-resistant aging capability of the insulation material and prolong the service life of the insulation material on the basis of improving the space charge characteristic.
3. The step of preparing the polypropylene-based composite material for insulating the high-voltage direct-current cable has the characteristics of simple production process, low energy consumption and short period, and the prepared insulating material has the characteristics of environmental protection and recyclability.
Drawings
FIG. 1 is a space charge distribution diagram of the polypropylene-based composite material (PU622 masterbatch) prepared in example 1 under a high-voltage direct-current electric field;
FIG. 2 is a space charge distribution diagram of the polypropylene-based composite material (PU770 master batch) prepared in example 2 under a high-voltage direct-current electric field;
FIG. 3 is a space charge distribution diagram of the polypropylene-based composite material (PU944 master batch) prepared in example 3 under a high-voltage direct-current electric field;
fig. 4 is a space charge distribution diagram of the polypropylene-based composite material (PU masterbatch) prepared in comparative example 1 under a high voltage direct current electric field.
The specific implementation mode is as follows:
the present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited thereto.
Example 1
The technical scheme adopted by the embodiment is that the polypropylene composite base material and the free radical trapping agent with the following mass ratio are subjected to melt blending and extrusion granulation to prepare the polypropylene-based high-voltage direct-current cable insulating material for improving the space charge characteristic by trapping free radicals:
85 parts of polypropylene
15 parts of ultra-low density polyethylene
6220.3 parts of free radical scavenger
The preparation method of the material for improving the charge characteristic of the insulating space of the polypropylene high-voltage direct-current cable by using the free radical trapping agent comprises the following steps:
fully mixing polypropylene, ultra-low density polyethylene and a free radical trapping agent according to the following mass parts to obtain a mixture:
85 parts of polypropylene
15 parts of ultra-low density polyethylene
6220.3 parts of a free radical scavenger;
and secondly, putting the mixture obtained in the step one into a blending granulator, melting and blending for 10min at the temperature of 170 ℃ and the rotating speed of 30r/min, and then extruding and granulating to obtain the PU622 master batch.
Example 2
The technical scheme adopted by the embodiment is that the polypropylene composite base material and the free radical trapping agent with the following mass ratio are subjected to melt blending and extrusion granulation to prepare the polypropylene-based high-voltage direct-current cable insulating material for improving the space charge characteristic by trapping free radicals:
85 parts of polypropylene
15 parts of ultra-low density polyethylene
7700.3 parts of free radical scavenger
The preparation method of the material for improving the charge characteristic of the insulating space of the polypropylene high-voltage direct-current cable by using the free radical trapping agent comprises the following steps:
fully mixing polypropylene, ultra-low density polyethylene and a free radical trapping agent according to the following mass parts to obtain a mixture:
85 parts of polypropylene
15 parts of ultra-low density polyethylene
7700.3 parts of a free radical scavenger;
and secondly, putting the mixture obtained in the step one into a blending granulator, melting and blending for 15min at the temperature of 180 ℃ and the rotating speed of 40r/min, and then extruding and granulating to obtain the PU770 master batch.
Example 3
The technical scheme adopted by the embodiment is that the polypropylene composite base material and the free radical trapping agent with the following mass ratio are subjected to melt blending and extrusion granulation to prepare the polypropylene-based high-voltage direct-current cable insulating material for improving the space charge characteristic by trapping free radicals:
85 parts of polypropylene
15 parts of ultra-low density polyethylene
9440.3 parts of free radical scavenger
The preparation method of the material for improving the charge characteristic of the insulating space of the polypropylene high-voltage direct-current cable by using the free radical trapping agent comprises the following steps:
fully mixing polypropylene, ultra-low density polyethylene and a free radical trapping agent according to the following mass parts to obtain a mixture:
85 parts of polypropylene
15 parts of ultra-low density polyethylene
9440.3 parts of a free radical scavenger;
and secondly, putting the mixture obtained in the step one into a blending granulator, melting and blending for 20min at the temperature of 190 ℃ and the rotating speed of 50r/min, and then extruding and granulating to obtain the PU944 master batch.
Example 4
The technical scheme adopted by the embodiment is that the polypropylene composite base material and the free radical trapping agent with the following mass ratio are subjected to melt blending and extrusion granulation to prepare the polypropylene-based high-voltage direct-current cable insulating material for improving the space charge characteristic by trapping free radicals:
85 parts of polypropylene
15 parts of ultra-low density polyethylene
9440.5 parts of free radical scavenger
The preparation method of the material for improving the charge characteristic of the insulating space of the polypropylene high-voltage direct-current cable by using the free radical trapping agent comprises the following steps:
fully mixing polypropylene, ultra-low density polyethylene and a free radical trapping agent according to the following mass parts to obtain a mixture:
85 parts of polypropylene
15 parts of ultra-low density polyethylene
9440.5 parts of a free radical scavenger;
and secondly, putting the mixture obtained in the step one into a blending granulator, melting and blending for 20min at the temperature of 190 ℃ and the rotating speed of 50r/min, and then extruding and granulating to obtain the PU944 master batch.
Example 5
The technical scheme adopted by the embodiment is that the polypropylene composite base material and the free radical trapping agent with the following mass ratio are subjected to melt blending and extrusion granulation to prepare the polypropylene-based high-voltage direct-current cable insulating material for improving the space charge characteristic by trapping free radicals:
85 parts of polypropylene
15 parts of ultra-low density polyethylene
9440.1 parts of free radical scavenger
The preparation method of the material for improving the charge characteristic of the insulating space of the polypropylene high-voltage direct-current cable by using the free radical trapping agent comprises the following steps:
fully mixing polypropylene, ultra-low density polyethylene and a free radical trapping agent according to the following mass parts to obtain a mixture:
85 parts of polypropylene
15 parts of ultra-low density polyethylene
9440.1 parts of a free radical scavenger;
and secondly, putting the mixture obtained in the step one into a blending granulator, melting and blending for 20min at the temperature of 190 ℃ and the rotating speed of 50r/min, and then extruding and granulating to obtain the PU944 master batch.
Comparative example 1
The technical scheme adopted by the embodiment is that the polypropylene composite base material and the free radical trapping agent with the following mass ratio are subjected to melt blending and extrusion granulation to prepare the polypropylene-based high-voltage direct-current cable insulating material for improving the space charge characteristic by trapping free radicals:
85 parts of polypropylene
15 parts of ultra-low density polyethylene
The preparation method of the material for improving the charge characteristic of the insulating space of the polypropylene high-voltage direct-current cable by using the free radical trapping agent comprises the following steps:
fully mixing polypropylene, ultra-low density polyethylene and a free radical trapping agent according to the following mass parts to obtain a mixture:
85 parts of polypropylene
15 parts of ultra-low density polyethylene
And secondly, putting the mixture obtained in the step one into a blending granulator, melting and blending for 15min at the temperature of 180 ℃ and the rotating speed of 40r/min, and then extruding and granulating to obtain the PU master batch.
Samples were taken from the radical scavenger modified polypropylene composite insulation master batches obtained in examples 1, 2 and 3 and the polypropylene composite insulation master batch not modified by the radical scavenger obtained in comparative example 1, respectively, and subjected to a space charge distribution test for 60min under a direct current field of 60kV/mm by a pulse electroacoustic method, and the results are shown in FIGS. 1 to 4.
The unmodified PU master batch of the comparative example introduces a large amount of negative charges, causing severe electric field distortion inside the insulation material. And more hole traps are introduced into PU622 master batch and PU770 master batch, so that the extraction of positive charges to a cathode is limited, the positive charges are accumulated in a sample, and the charge dissipation is very slow due to deep traps. In addition, a small amount of the charge in the PU944 sample accumulated near the cathode and slowly dissipated over time. The trap depth and density introduced by additives such as free radical scavengers have great influence on the charge behavior of the composite material. The accumulation of positive charge creates a reverse electric field when traps in the sample near the electrodes trap the charge injected from the electrodes. The intensity of the electric field of the homo generated in the sample by the electrode is reduced, and the distortion of the electric field is reduced, so that the positive charge injection is inhibited. The three free radical scavengers show different performances on the trap and dielectric performance of the composite material due to the unique three-dimensional structure and the chemical capability of scavenging free radicals. The steric hindrance effect is determined by the special chemical molecular structure and group distribution of the radical scavenger, and to some extent, determines the trap position of the composite material.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (4)
1. The method for improving the insulation space charge characteristic of the polypropylene high-voltage direct-current cable is characterized in that the polypropylene high-voltage direct-current cable insulation material for improving the space charge characteristic by capturing free radicals is prepared by adopting the following polypropylene composite base material, ultra-low density polyethylene and free radical trapping agent in the following mass ratio through melt blending, extrusion and granulation:
85 parts of polypropylene
15 parts of ultra-low density polyethylene
0.1-0.5 part of free radical trapping agent.
2. The method for improving insulation space charge characteristics of a polypropylene high voltage direct current cable according to claim 1, wherein the polypropylene is one or a mixture of isotactic polypropylene or syndiotactic polypropylene.
3. The method for improving the insulation space charge characteristic of the polypropylene high-voltage direct current cable according to claim 1, wherein the radical scavenger is a hindered amine stabilizer with steric hindrance effect, specifically any one of radical scavenger 622, radical scavenger 770 and radical scavenger 944.
4. The method for improving the insulation space charge characteristic of the polypropylene high-voltage direct current cable according to the claims 1 to 3, characterized in that a mixture of a polypropylene composite base material, ultra-low density polyethylene and a radical scavenger is put into a blending granulator, and after melt blending, a master batch is obtained through extrusion granulation;
the temperature range is 170-190 ℃, the rotating speed is 30-50 r/min, and the blending time is 10-20 min.
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| CN112379184A (en) * | 2020-11-05 | 2021-02-19 | 天津大学 | Electro-acoustic pulse method-based algorithm for measuring space charge distribution in line-plate electrode |
| CN113045811A (en) * | 2021-03-15 | 2021-06-29 | 远东电缆有限公司 | One-step ultraviolet crosslinked polyethylene cable insulation and preparation method thereof |
| WO2022067546A1 (en) * | 2020-09-29 | 2022-04-07 | Dow Global Technologies Llc | Colorable thermoplastic polymeric compositions |
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Cited By (3)
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| WO2022067546A1 (en) * | 2020-09-29 | 2022-04-07 | Dow Global Technologies Llc | Colorable thermoplastic polymeric compositions |
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Application publication date: 20200320 |