CN101445627A - High-voltage DC cable insulating material and a preparation method thereof - Google Patents
High-voltage DC cable insulating material and a preparation method thereof Download PDFInfo
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- CN101445627A CN101445627A CNA2008102043928A CN200810204392A CN101445627A CN 101445627 A CN101445627 A CN 101445627A CN A2008102043928 A CNA2008102043928 A CN A2008102043928A CN 200810204392 A CN200810204392 A CN 200810204392A CN 101445627 A CN101445627 A CN 101445627A
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Abstract
The invention relates to high-voltage DC cable insulating material and a preparation method thereof in the technical field of the insulating material. The preparation method is that: 100 weight portions of low-density polyethylene, 0.1-1 weight portion of anti-oxidizer, 0.5-5 weight portions of nano inorganic powder and 0.2-5 weight portions of maleic anhydride are placed into and mixed and compounded in a banbury mixer; the temperature of mixing and compounding is 373K to 378K and the mixing and compounding time is 10 to 15 minutes; 0.1-5 weight portions of cross-linking agent is added into the mixture and is mixed and compounded under the temperature of 373K to 378K for 10 to 15 minutes; then, the high-voltage DC cable insulating material is obtained; wherein, the density of the low-density polyethylene is less than 0.9g/cm<3>. The insulating material of the preparation method can effectively improve the mechanical and electric properties of the high-voltage DC cable, thus avoiding the disadvantage that the environment is polluted and damaged by an oilpaper insulating cable due to the leakage of the insulating oil.
Description
Technical field
What the present invention relates to is a kind of insulating material technical field and preparation method thereof, and specifically, what relate to is a kind of high-voltage DC cable insulating material and preparation method thereof.
Background technology
With respect to the alternating current transmission technology, direct-current transmission is low owing to having the circuit cost; Line losses is little; There is not the system stability problem; Can limiting short-circuit current; Regulate characteristics such as quick, reliable, in power transmission and distribution, more and more adopted gradually.Because plastics direct current power cable has good mechanical property, the working line loss is littler, and installation and running maintenance are convenient, and acid-and base-resisting is anticorrosive, and can not become the focus of present research to advantages such as environment pollute.Direct current cables is in operational process, can not go out the electric field periodical change under the phenomenon alternating current transmission situation, therefore the gritty particle (as crosslinked by product) in the polyethylene is under the constant electric field action, be dissociated into two kinds of ions of negative and positive, and each direction to two electrodes moves under effect of electric field, Partial charge is caught by the trap in the polyethylene in the process that moves, and forms the space charge bag, and causes partial electric field distortion in the polyethylene.Studies show that internal field's distortion that space-charge effect causes can arrive 5-7 times of steady-state field, thereby produce puncture of dielectric, causes cable destroyed.In order to suppress the space charge phenomenon in the polyethylene, there have been many scholars to propose to improve the method for polyethylene internal space charge distribution by nano modification.The Japan scholar was studying in recent years by add magnesium oxide powder in new LDPE (film grade) (LDPE) always, improved every electric property that insulating material comprises distribution of space charge, and had obtained bigger achievement.
Find through the retrieval to prior art; The article Space Charge Formation in LDPE/MgONano-composite under High Electric Field at High Temperature (distribution of space charge in the LDPE/MgO complex media under the high temperature highfield) that T.maezawa etc. deliver at 2007 Annual Report Conferenceon Electrical Insulation and Dielectric Phenomena (electric insulation and dielectric annual report meeting 2007) and Hayase.Y etc. are at 8thInternational Conference on Properties and applications of DielectricMaterials; The article SpaceCharge Formation in LDPE/MgO Nano-composite Thin Film under Ultra-highDC Electric Stress that 2006 (the 8th dielectric substance properties and applications international conferences 2006) are delivered (under the superelevation electric field LDPE/MgO composite dielectric film Space-charge distribute) points out, adding the nano-MgO powder in the LDPE can suppress polyethylene inner space charge distribution. But, by discovering, because the manufacturer of LDPE is more, and the trade mark of LDPE is also more, by adding nano oxidized magnesium dust, the distribution of space charge in the LDPE of all different trades mark is improved, such as a kind of LDPE that adopts Exxon Mobil company to produce as base mateiral, distribution of space charge in its MgO/LDPE complex media is poorer than the distribution of space charge in the pure LDPE on the contrary, and the aberration rate of electric field is higher.
Further in the retrieval, discovery Japanese Patent No. JP11224544, Japanese Patent No. JP11224545 and U.S. Patent number 6924435 have been introduced, and by add the method for maleic anhydride in polyethylene, reach the purpose that suppresses distribution of space charge in the insulating material.In polyethylene, add an amount of maleic anhydride, can suppress effectively that insulation is inner cationic moves, and then suppress gathering of they and form the space charge bag, still, the negatively charged ion less to molecular radius, the inhibition effect of maleic anhydride is not clearly.
Summary of the invention
The objective of the invention is at the deficiencies in the prior art, a kind of high-voltage DC cable insulating material and preparation method thereof is provided, by in polyvinyl resin, adding nano inorganic polarity powder, ion scavenger etc., reaching the internal space electric charge that suppresses to insulate gathers, improve the purpose of its internal electric field, a kind ofly can be used for mesohigh direct current cables insulating plastic material thereby prepare.
The present invention is achieved by the following technical solutions:
High-voltage DC cable insulating material involved in the present invention, component that comprises and content thereof are: new LDPE (film grade) 100 weight parts, inorganic nano powder 0.5-5 weight part, ion scavenger 0.2-5 weight part, oxidation inhibitor 0.1-1 weight part, linking agent 0.1-5 weight part.
The melting index of new LDPE (film grade) of the present invention is 0.5-10g/10min, and density is less than 0.9g/cm
3, degree of crystallinity is less than 10%, and catalyst residue is less than 1/1000.
The nano inorganic powder that the present invention adopts is magnesium oxide, silicon oxide, aluminium sesquioxide.The primary partical particle diameter is 12-30nm, and the BET specific surface area is 80-160m
2/ g.
The linking agent that the present invention adopts is dicumyl peroxide, di-t-butyl peroxide, 2,5-dimethyl-2,5-two (t-butyl peroxy)-acetylene or 2,5-dimethyl-2,5 two (t-butyl peroxy)-hexane tertiary butyl hydrogen.
The oxidation inhibitor that the present invention adopts is antioxidant 1010 or antioxidant 300.
The preparation method of high-voltage DC cable insulating material involved in the present invention, be specially: with the new LDPE (film grade) of 100 weight parts, 0.1-1 the oxidation inhibitor of weight part, the nano inorganic powder of 0.5-5 weight part, the maleic anhydride of 0.2-5 weight part, it is mixing to put into Banbury mixer, melting temperature is 373K-378K, and mixing time is 10-15 minute, and then the 0.1-5 parts by weight of cross-linking agent is added, remained under the temperature of 373K-378K mixing 10-15 minute, and obtained high-voltage DC cable insulating material.
The present invention is in new LDPE (film grade), adds inorganic polar nanometer powder and ion scavenger, and the method by mechanical blending has prepared a kind of high-voltage DC cable insulating material.Compare very effective gathering of suppressing insulation internal space electric charge with the crosslinked polyethylene of do not mix any inorganic nano powder and ion scavenger.Do not mix the crosslinked polyethylene of inorganic nano powder and ion scavenger under the electric field of 10kV/mm, and there is tangible space charge phenomenon insulation inside, and along with the increase of extra electric field, the insulation volume inside quantity of electric charge increases gradually; Under the 60kV/mm electric field,, space charge reached 60%-80% because causing the aberration rate of the electric field that insulation is inner.The complex media that adds the preparation of inorganic nano powder and ion scavenger is under 10kV/mm and 30kV/mm electric field, and insulation inside does not have the accumulation phenomena of space charge; Under the 60kV/mm electric field, a spot of space charge of the inner appearance of complex media insulation can get by calculating, and this complex media insulation is inner because the electric field distortion rate that space-charge effect causes is no more than 15%.
Description of drawings
Fig. 1. space charge and distribution map of the electric field that the embodiment of the invention 1 material pressurizeed 30 minutes under the 60kV/mm electric field, wherein (a) is distribution of space charge in the material, (b) is electric field distribution.
Fig. 2. space charge and distribution map of the electric field that the embodiment of the invention 2 materials pressurizeed 30 minutes under the 60kV/mm electric field, wherein (a) is distribution of space charge in the material, (b) is electric field distribution.
Fig. 3. space charge and distribution map of the electric field that the embodiment of the invention 3 materials pressurizeed 30 minutes under the 60kV/mm electric field, wherein (a) is distribution of space charge in the material, (b) is electric field distribution.
Fig. 4. space charge and distribution map of the electric field that the embodiment of the invention 4 materials pressurizeed 30 minutes under the 60kV/mm electric field, wherein (a) is distribution of space charge in the material, (b) is electric field distribution.
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated: present embodiment is being to implement under the prerequisite with the technical solution of the present invention, provided detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
Embodiment 1
With 50 gram new LDPE (film grade)s, 0.05 gram antioxidant 1010,2.5 gram aluminium sesquioxides, to put into the Haake torque rheometer mixing for 0.5 gram maleic anhydride, melting temperature is 375K, mixing time is 10 minutes, again 1.15 gram dicumyl peroxides were put into the Haake torque rheometer mixing 10 minutes, melting temperature remains on 375K, obtains a kind of insulating material that can be used for the high-pressure plastic cable.
Embodiment 2
With 50 gram new LDPE (film grade)s, 0.05 gram antioxidant 1010,1 gram magnesium oxide, to put into the Haake torque rheometer mixing for 0.1 gram maleic anhydride, melting temperature is 378K, mixing time is 15 minutes, again 1.15 gram dicumyl peroxides were put into the Haake torque rheometer mixing 15 minutes, melting temperature remains on 378K, obtains a kind of insulating material that can be used for the high-pressure plastic cable.
Embodiment 3
With 50 gram new LDPE (film grade)s, 0.05 gram antioxidant 1010,0.25 gram silicon oxide, to put into the Haake torque rheometer mixing for 2.5 gram maleic anhydrides, melting temperature is 373K, mixing time is 13 minutes, again 0.5 gram dicumyl peroxide was put into the Haake torque rheometer mixing 13 minutes, melting temperature remains on 373K, obtains a kind of insulating material that can be used for the high-pressure plastic cable.
Embodiment 4
With 50 gram new LDPE (film grade)s, to put into the Haake torque rheometer mixing for 0.05 gram antioxidant 1010, melting temperature is 373K-378K, mixing time is 10-15 minute, again 1.15 gram dicumyl peroxides were put into the mixing 10-15 of Haake torque rheometer minute, melting temperature remains on 373K-378K, obtains correlated insulating material.
The prepared material of above embodiment 1-4 pressurizes space charge 30 minutes time the and electric field distribution respectively as Fig. 1, Fig. 2, Fig. 3, shown in Figure 4 under the 60kV/mm electric field.Under the 60kV/mm external electric field, the material that embodiment 1 is prepared, the inner generation of almost not having space charge, sample volume inside peak electric field is about 61.1kV/mm, and electric field is almost undistorted; The material that embodiment 2, embodiment 3 are prepared, there is a spot of space charge inside, and the peak value of sample internal space electric field is about 66.5kV/mm and 64.1kV/mm respectively, and the electric field distortion rate is respectively 6.8% and 10.8%; There is more space charge embodiment 4 prepared contrast material inside, because the inner more negative space charge of sample, on anode (B), induce more positive charge, by Fig. 4 (b) as can be seen the peak value of sample internal space electric field be about 107.1kV/mm, the electric field distortion rate is 78.5%.
Claims (9)
1, a kind of high-voltage DC cable insulating material, it is characterized in that the component and the content thereof that comprise are: new LDPE (film grade) 100 weight parts, inorganic nano powder 0.5-5 weight part, ion scavenger 0.2-5 weight part, oxidation inhibitor 0.1-1 weight part, linking agent 0.1-5 weight part, wherein said new LDPE (film grade), density is less than 0.9g/cm
3
2, high-voltage DC cable insulating material according to claim 1 is characterized in that, the melting index of described new LDPE (film grade) is 0.5-10g/10min, and degree of crystallinity is less than 10%, and catalyst residue is less than 1/1000.
3, high-voltage DC cable insulating material according to claim 1 is characterized in that, described nano inorganic powder is a kind of in magnesium oxide, silicon oxide, the aluminium sesquioxide.
4, high-voltage DC cable insulating material according to claim 1 and 2 is characterized in that, described nano inorganic powder, and its primary partical particle diameter is 12-30nm, the BET specific surface area is 80-160m
2/ g.
5, high-voltage DC cable insulating material according to claim 1, it is characterized in that, described linking agent is dicumyl peroxide, di-t-butyl peroxide, 2,5-dimethyl-2,5-two (t-butyl peroxy)-acetylene or 2, a kind of in 5-dimethyl-2,5 two (t-butyl peroxy)-hexane tertiary butyl hydrogen.
6, high-voltage DC cable insulating material according to claim 1 is characterized in that, described oxidation inhibitor is antioxidant 1010 or antioxidant 300.
7, a kind of preparation method of high-voltage DC cable insulating material as claimed in claim 1, it is characterized in that, new LDPE (film grade) with 100 weight parts, 0.1-1 the oxidation inhibitor of weight part, 0.5-5 the nano inorganic powder of weight part, 0.2-5 the maleic anhydride of weight part, it is mixing to put into Banbury mixer, melting temperature is 373K-378K, and then the dicumyl peroxide of 0.1-5 weight part added, remain under the temperature of 373K-378K mixingly, obtain high-voltage DC cable insulating material, wherein: described new LDPE (film grade), density is less than 0.9g/cm
3
8, the preparation method of high-voltage DC cable insulating material according to claim 7 is characterized in that, described to put into Banbury mixer mixing, and its time is 10-15 minute.
9, the preparation method of high-voltage DC cable insulating material according to claim 7 is characterized in that, mixing under the described temperature that remains on 373K-378K, its mixing time is 10-15 minute.
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