CN110544584A - Composite impregnant for improving durability of metalized film capacitor - Google Patents
Composite impregnant for improving durability of metalized film capacitor Download PDFInfo
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- CN110544584A CN110544584A CN201910841221.4A CN201910841221A CN110544584A CN 110544584 A CN110544584 A CN 110544584A CN 201910841221 A CN201910841221 A CN 201910841221A CN 110544584 A CN110544584 A CN 110544584A
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- molecular sieve
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- 239000003990 capacitor Substances 0.000 title claims abstract description 47
- 239000002131 composite material Substances 0.000 title claims abstract description 30
- 239000011104 metalized film Substances 0.000 title claims abstract description 29
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical class [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 claims abstract description 41
- 229920002367 Polyisobutene Polymers 0.000 claims abstract description 18
- 239000004006 olive oil Substances 0.000 claims abstract description 18
- 235000008390 olive oil Nutrition 0.000 claims abstract description 18
- 229910052582 BN Inorganic materials 0.000 claims abstract description 10
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000002994 raw material Substances 0.000 claims abstract description 7
- 239000002808 molecular sieve Substances 0.000 claims description 22
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 7
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- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- 238000002360 preparation method Methods 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 3
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- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 3
- 238000010292 electrical insulation Methods 0.000 description 3
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- GVJHHUAWPYXKBD-UHFFFAOYSA-N (±)-α-Tocopherol Chemical compound OC1=C(C)C(C)=C2OC(CCCC(C)CCCC(C)CCCC(C)C)(C)CCC2=C1C GVJHHUAWPYXKBD-UHFFFAOYSA-N 0.000 description 2
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 239000005642 Oleic acid Substances 0.000 description 2
- 229910021536 Zeolite Inorganic materials 0.000 description 2
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- 229910002804 graphite Inorganic materials 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 2
- 235000021313 oleic acid Nutrition 0.000 description 2
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid group Chemical group C(CCCCCCC\C=C/CCCCCCCC)(=O)O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 description 2
- 239000010457 zeolite Substances 0.000 description 2
- WRIDQFICGBMAFQ-UHFFFAOYSA-N (E)-8-Octadecenoic acid Natural products CCCCCCCCCC=CCCCCCCC(O)=O WRIDQFICGBMAFQ-UHFFFAOYSA-N 0.000 description 1
- FPIPGXGPPPQFEQ-UHFFFAOYSA-N 13-cis retinol Natural products OCC=C(C)C=CC=C(C)C=CC1=C(C)CCCC1(C)C FPIPGXGPPPQFEQ-UHFFFAOYSA-N 0.000 description 1
- LQJBNNIYVWPHFW-UHFFFAOYSA-N 20:1omega9c fatty acid Natural products CCCCCCCCCCC=CCCCCCCCC(O)=O LQJBNNIYVWPHFW-UHFFFAOYSA-N 0.000 description 1
- QSBYPNXLFMSGKH-UHFFFAOYSA-N 9-Heptadecensaeure Natural products CCCCCCCC=CCCCCCCCC(O)=O QSBYPNXLFMSGKH-UHFFFAOYSA-N 0.000 description 1
- 240000008415 Lactuca sativa Species 0.000 description 1
- 240000007817 Olea europaea Species 0.000 description 1
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 description 1
- 235000021314 Palmitic acid Nutrition 0.000 description 1
- 235000021319 Palmitoleic acid Nutrition 0.000 description 1
- 240000005428 Pistacia lentiscus Species 0.000 description 1
- 235000021355 Stearic acid Nutrition 0.000 description 1
- FPIPGXGPPPQFEQ-BOOMUCAASA-N Vitamin A Natural products OC/C=C(/C)\C=C\C=C(\C)/C=C/C1=C(C)CCCC1(C)C FPIPGXGPPPQFEQ-BOOMUCAASA-N 0.000 description 1
- 229930003270 Vitamin B Natural products 0.000 description 1
- 229930003316 Vitamin D Natural products 0.000 description 1
- QYSXJUFSXHHAJI-XFEUOLMDSA-N Vitamin D3 Natural products C1(/[C@@H]2CC[C@@H]([C@]2(CCC1)C)[C@H](C)CCCC(C)C)=C/C=C1\C[C@@H](O)CCC1=C QYSXJUFSXHHAJI-XFEUOLMDSA-N 0.000 description 1
- 229930003427 Vitamin E Natural products 0.000 description 1
- 229930003448 Vitamin K Natural products 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
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- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- FPIPGXGPPPQFEQ-OVSJKPMPSA-N all-trans-retinol Chemical compound OC\C=C(/C)\C=C\C=C(/C)\C=C\C1=C(C)CCCC1(C)C FPIPGXGPPPQFEQ-OVSJKPMPSA-N 0.000 description 1
- 235000020661 alpha-linolenic acid Nutrition 0.000 description 1
- 229910000323 aluminium silicate Inorganic materials 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 235000006708 antioxidants Nutrition 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 239000010516 ayurvedic herbal oil Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 125000001797 benzyl group Chemical group [H]C1=C([H])C([H])=C(C([H])=C1[H])C([H])([H])* 0.000 description 1
- 239000004359 castor oil Substances 0.000 description 1
- 235000019438 castor oil Nutrition 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- -1 coatings Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- WIGCFUFOHFEKBI-UHFFFAOYSA-N gamma-tocopherol Natural products CC(C)CCCC(C)CCCC(C)CCCC1CCC2C(C)C(O)C(C)C(C)C2O1 WIGCFUFOHFEKBI-UHFFFAOYSA-N 0.000 description 1
- ZEMPKEQAKRGZGQ-XOQCFJPHSA-N glycerol triricinoleate Natural products CCCCCC[C@@H](O)CC=CCCCCCCCC(=O)OC[C@@H](COC(=O)CCCCCCCC=CC[C@@H](O)CCCCCC)OC(=O)CCCCCCCC=CC[C@H](O)CCCCCC ZEMPKEQAKRGZGQ-XOQCFJPHSA-N 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 description 1
- 235000020778 linoleic acid Nutrition 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000010907 mechanical stirring Methods 0.000 description 1
- 239000002480 mineral oil Substances 0.000 description 1
- 235000010446 mineral oil Nutrition 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 235000021281 monounsaturated fatty acids Nutrition 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical class CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- IPCSVZSSVZVIGE-UHFFFAOYSA-N palmitic acid group Chemical group C(CCCCCCCCCCCCCCC)(=O)O IPCSVZSSVZVIGE-UHFFFAOYSA-N 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- SHUZOJHMOBOZST-UHFFFAOYSA-N phylloquinone Natural products CC(C)CCCCC(C)CCC(C)CCCC(=CCC1=C(C)C(=O)c2ccccc2C1=O)C SHUZOJHMOBOZST-UHFFFAOYSA-N 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000004224 protection Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 235000012045 salad Nutrition 0.000 description 1
- 229930195734 saturated hydrocarbon Natural products 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
- 229920002545 silicone oil Polymers 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 230000009967 tasteless effect Effects 0.000 description 1
- 235000021122 unsaturated fatty acids Nutrition 0.000 description 1
- 150000004670 unsaturated fatty acids Chemical class 0.000 description 1
- 235000015112 vegetable and seed oil Nutrition 0.000 description 1
- 239000008158 vegetable oil Substances 0.000 description 1
- 235000019155 vitamin A Nutrition 0.000 description 1
- 239000011719 vitamin A Substances 0.000 description 1
- 235000019156 vitamin B Nutrition 0.000 description 1
- 239000011720 vitamin B Substances 0.000 description 1
- 235000019166 vitamin D Nutrition 0.000 description 1
- 239000011710 vitamin D Substances 0.000 description 1
- 150000003710 vitamin D derivatives Chemical class 0.000 description 1
- 235000019165 vitamin E Nutrition 0.000 description 1
- 229940046009 vitamin E Drugs 0.000 description 1
- 239000011709 vitamin E Substances 0.000 description 1
- 235000019168 vitamin K Nutrition 0.000 description 1
- 239000011712 vitamin K Substances 0.000 description 1
- 150000003721 vitamin K derivatives Chemical class 0.000 description 1
- 229940045997 vitamin a Drugs 0.000 description 1
- 229940046008 vitamin d Drugs 0.000 description 1
- 229940046010 vitamin k Drugs 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/002—Details
- H01G4/018—Dielectrics
- H01G4/04—Liquid dielectrics
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/002—Details
- H01G4/018—Dielectrics
- H01G4/20—Dielectrics using combinations of dielectrics from more than one of groups H01G4/02 - H01G4/06
- H01G4/22—Dielectrics using combinations of dielectrics from more than one of groups H01G4/02 - H01G4/06 impregnated
- H01G4/221—Dielectrics using combinations of dielectrics from more than one of groups H01G4/02 - H01G4/06 impregnated characterised by the composition of the impregnant
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/33—Thin- or thick-film capacitors
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Manufacturing & Machinery (AREA)
- Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
Abstract
The invention provides a composite impregnant for improving the durability of a metalized film capacitor, which comprises the following raw materials in parts by mass: 50-60 parts of low-molecular-weight polyisobutylene, 40-65 parts of olive oil, 8-15 parts of modified molecular sieve and 5-12 parts of hexagonal boron nitride. The composite impregnant has very low moisture content, is reduced to an ideal interval range, and can further absorb moisture and gas generated by a capacitor core in the using process of a capacitor so as to prevent secondary moisture; the olive oil in the compound impregnant is weakly acidic, the modified molecular sieve is weakly alkaline, and the compound impregnant is almost neutral after being neutralized by acid and alkali, so that the phenomenon that the plating layer is corroded to generate an easily-broken point is avoided; the composite impregnant has lower dielectric loss and thermal expansion coefficient, better thermal stability, weather resistance, ultraviolet resistance, heat dissipation and high temperature resistance, ensures the stable performance of the capacitor, and obviously improves the durability and service life of the metallized film capacitor.
Description
Technical Field
The invention belongs to the field of capacitors, and particularly relates to a composite impregnant for improving the durability of a metalized film capacitor.
Background
The metallized film capacitor has high voltage resistance, high insulation resistance, good impedance frequency characteristic, low ESR, high capacity stability and low loss tangent. Currently, the impregnant used for metallized film capacitors is generally vegetable oil such as castor oil and salad oil, or mineral oil such as methyl silicone oil and benzyl silicone oil.
The biggest defect of using oil as impregnant of metallized film capacitor is that the oil always contains some water inevitably, and in the process of using metallized film capacitor, the water will gradually permeate into the capacitor core to cause the metal layer of metallized film to dissolve, drop or oxidize, which leads to the capacitor capacity attenuation to be rapid and failure, reduces the capacitor performance, and simultaneously, the surface layer of metallized film is easy to generate weak point to generate breakdown failure, thereby causing the operation and service life of metallized film capacitor to be unstable and uncontrollable, deteriorating the performance and further failing in advance.
Some manufacturers of metallized film capacitors have previously dehydrated these oils in vacuum, but not only require complicated equipment and are expensive, but also, above all, cannot prevent the oils from being secondarily wetted, which adversely affects the life and performance of the metallized film capacitors.
In addition, the use of these oils alone as impregnants has disadvantages such as high dielectric loss, poor thermal stability, and high thermal expansion coefficient, which adversely affect the quality and life of metallized film capacitors.
Disclosure of Invention
In view of the problems of the prior art, the present invention provides a composite impregnant for improving the durability of a metallized film capacitor.
the invention solves the technical problems through the following technical means:
A composite impregnant for improving the durability of a metalized film capacitor comprises the following raw materials in parts by mass: 50-60 parts of low-molecular-weight polyisobutylene, 40-65 parts of olive oil, 8-15 parts of modified molecular sieve and 5-12 parts of hexagonal boron nitride.
Further, the olive oil is extra virgin olive oil.
Further, the preparation of the modified molecular sieve comprises the following steps:
Step1, putting the molecular sieve into a high-speed stirring kettle, heating, stirring and crushing until the molecular sieve is crushed into superfine powder to obtain powdery molecular sieve;
And Step2, placing the powdery molecular sieve in a muffle furnace, baking for 8-10 hours at 300-400 ℃ under normal pressure until the molecular sieve is completely dried, placing the molecular sieve in nitrogen, cooling to 200-250 ℃, and immediately storing the molecular sieve in a dryer to obtain the modified molecular sieve.
Further, in the Step1, the rotation speed of heating and stirring is 4200-5500 r/min, and the time is 2-3 hours.
The invention has the beneficial effects that: the composite impregnant has very low moisture content, is reduced to an ideal interval range, and can further absorb moisture and gas generated by a capacitor core in the using process of a capacitor so as to prevent secondary moisture; the olive oil in the compound impregnant is weakly acidic, the modified molecular sieve is weakly alkaline, and after the compound impregnant is neutralized by acid and alkali, the compound impregnant is almost neutral, so that the phenomenon that a plating layer is corroded to generate an easily-broken point is avoided; the composite impregnant has lower dielectric loss and thermal expansion coefficient, better thermal stability, weather resistance, ultraviolet resistance, heat dissipation and high temperature resistance, and ensures the stable performance of the capacitor, thereby obviously improving the durability and the service life of the metallized film capacitor.
Detailed Description
in order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A composite impregnant for improving the durability of a metalized film capacitor comprises the following raw materials in parts by mass: 50-60 parts of low-molecular-weight polyisobutylene, 40-65 parts of olive oil, 8-15 parts of modified molecular sieve and 5-12 parts of hexagonal boron nitride.
example 1
A composite impregnant for improving the durability of a metalized film capacitor comprises the following raw materials in parts by mass: 50 parts of low molecular weight polyisobutylene, 65 parts of olive oil, 15 parts of modified molecular sieve and 5 parts of hexagonal boron nitride.
Example 2
a composite impregnant for improving the durability of a metalized film capacitor comprises the following raw materials in parts by mass: 60 parts of low molecular weight polyisobutylene, 40 parts of olive oil, 8 parts of modified molecular sieve and 12 parts of hexagonal boron nitride.
example 3
A composite impregnant for improving the durability of a metalized film capacitor comprises the following raw materials in parts by mass: 55 parts of low molecular weight polyisobutylene, 52 parts of olive oil, 11 parts of modified molecular sieve and 9 parts of hexagonal boron nitride.
The polyisobutene has the chemical characteristics of saturated hydrocarbon compounds, the side chain methyl groups are closely and symmetrically distributed, and the polyisobutene is a polymer with unique performance, and the aggregation state and the property of the polyisobutene depend on the molecular weight and the molecular weight distribution of the polyisobutene. The polyisobutylene is nontoxic and tasteless, has excellent acid and alkali resistance, ultraviolet resistance, high temperature resistance and weather resistance, good electrical insulation property and excellent air tightness, and has slow molecular chain movement and small free volume due to the existence of two substituted methyl groups, so that low diffusion coefficient and gas permeability are generated, the polyisobutylene has good thermal stability, can be processed at the temperature of 140-200 ℃, and has basically unchanged molecular weight. Generally, low and medium molecular weight polyisobutylenes can be used as oil additives, mastics, sealants, coatings, lubricants, plasticizers, and cable impregnants. The low molecular weight polyisobutylene is a non-volatile liquid with stable chemical properties, is resistant to oxidation, is impermeable to water vapor and other gases, has hydrophobicity, enables external air and moisture to be incapable of penetrating through the polyisobutylene and entering the capacitor core, reduces the moisture content of the composite impregnant, prevents secondary moisture, improves the thermal stability, ultraviolet resistance, high temperature resistance and weather resistance of the composite impregnant, ensures the stability of the performance of the capacitor, and improves the durability and the service life of the whole capacitor.
The olive oil is prepared by directly cold pressing fresh olive fruits, is not subjected to heating and chemical treatment, is rich in monounsaturated fatty acid-oleic acid, and also contains vitamin A, vitamin B, vitamin D, vitamin E, vitamin K, antioxidant, etc. The six most important fatty acids in olive oil are oleic, linoleic, linolenic, palmitoleic, palmitic and stearic acids, respectively, with the oleic acid (the most predominant fraction of monounsaturated fatty acids) being the highest. Unlike herbal oils, olive oil, because of its antioxidant properties and very high unsaturated fatty acid content, maintains its chemical structure stable at high temperatures, and further makes the composite impregnant have better thermal stability, oxidation resistance, durability and service life for metallized film capacitors. Wherein the acidity of the extra virgin olive oil is not more than 1%; the acidity of the high-quality virgin olive oil is slightly higher but not more than 2%.
the preparation method of the modified molecular sieve comprises the following steps:
Step1, putting the molecular sieve into a high-speed stirring kettle, heating, stirring and crushing until the molecular sieve is crushed into superfine powder to obtain powdery molecular sieve; the heating and stirring speed is 4200-5500 r/min, and the time is 2-3 hours;
And Step2, placing the powdery molecular sieve in a muffle furnace, baking for 8-10 hours at 300-400 ℃ under normal pressure until the molecular sieve is completely dried, placing the molecular sieve in nitrogen, cooling to 200-250 ℃, and immediately storing the molecular sieve in a dryer to obtain the modified molecular sieve.
The molecular sieve is artificially synthesized hydrated aluminosilicate (zeolite) or natural zeolite with the function of screening molecules, has high adsorption capacity, strong selectivity and high temperature resistance, is widely used in organic chemical industry and petrochemical industry, and is also an excellent adsorbent for gas dehydration. The modified molecular sieve is added to improve the high temperature resistance of the composite impregnant, the moisture content of the composite impregnant is reduced to an ideal interval range, meanwhile, in the using process of the capacitor, the composite impregnant can further absorb moisture and gas generated by a capacitor core to prevent secondary moisture, in addition, the alkalescence of the modified molecular sieve is neutralized with the faintly acid phase of olive oil, the composite impregnant is almost neutral, the phenomenon that a plating layer is corroded to generate a breakdown point is avoided, and the durability and the service life of the metalized film capacitor are obviously improved.
Hexagonal boron nitride is called white graphite, has a layered structure similar to graphite, has good lubricity, electrical insulation, thermal conductivity and chemical corrosion resistance, neutron absorption capacity and stable chemical property, is inert to all molten metal chemistry, is convenient for machining a formed product, has very high moisture resistance, has a melting point of 3000 ℃ under the pressure of nitrogen, sublimes at 2500 ℃ under atmospheric pressure, resists oxidation temperature of 900 ℃, resists high temperature of 2000 ℃, has a melting point of 3000 ℃ in nitrogen and argon and has a breakdown voltage of 2.0-3.0 kv/mm. The hexagonal boron nitride is added, so that the dielectric loss and the thermal expansion coefficient of the composite impregnant are remarkably reduced, the heat resistance, the heat dissipation performance, the chemical corrosion resistance and the electrical insulation of the composite impregnant are improved, the chemical property is stable, the quality and the durability of a capacitor are improved, and the service life of the capacitor is prolonged.
the composite impregnant has very low moisture content, is reduced to an ideal interval range, and can further absorb moisture and gas generated by a capacitor core in the using process of a capacitor so as to prevent secondary moisture; the olive oil in the compound impregnant is weakly acidic, the modified molecular sieve is weakly alkaline, and after the compound impregnant is neutralized by acid and alkali, the compound impregnant is almost neutral, so that the phenomenon that a plating layer is corroded to generate an easily-broken point is avoided; the composite impregnant has lower dielectric loss and thermal expansion coefficient, better thermal stability, weather resistance, ultraviolet resistance, heat dissipation and high temperature resistance, and ensures the stable performance of the capacitor, thereby obviously improving the durability and the service life of the metallized film capacitor.
the preparation method of the compound impregnant comprises the following steps:
(1) Pumping the low-molecular-weight polyisobutylene and the olive oil into a vacuum tank according to the mass fraction, and mixing for 6-9 hours in vacuum at the temperature of 80-120 ℃ and under the pressure not greater than 200MPa until the polyisobutylene and the olive oil are completely mixed to obtain a mixed solution;
(2) And (3) placing the mixed solution, the modified molecular sieve and the hexagonal boron nitride in a mechanical stirring pump according to the mass fraction, and stirring at normal temperature until the mixed solution is completely mixed to obtain the compound impregnant.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (4)
1. The composite impregnant for improving the durability of the metallized film capacitor is characterized in that: the composite material comprises the following raw materials in parts by mass: 50-60 parts of low-molecular-weight polyisobutylene, 40-65 parts of olive oil, 8-15 parts of modified molecular sieve and 5-12 parts of hexagonal boron nitride.
2. A composite impregnant for improving the durability of metallized film capacitors as claimed in claim 1, wherein: the olive oil is special virgin olive oil.
3. A composite impregnant for improving the durability of metallized film capacitors as claimed in claim 1 or 2, wherein: the preparation method of the modified molecular sieve comprises the following steps:
Step1, putting the molecular sieve into a high-speed stirring kettle, heating, stirring and crushing until the molecular sieve is crushed into superfine powder to obtain powdery molecular sieve;
And Step2, placing the powdery molecular sieve in a muffle furnace, baking for 8-10 hours at 300-400 ℃ under normal pressure until the molecular sieve is completely dried, placing the molecular sieve in nitrogen, cooling to 200-250 ℃, and immediately storing the molecular sieve in a dryer to obtain the modified molecular sieve.
4. A composite impregnant for improving the durability of metallized film capacitors as claimed in claim 3, wherein: in the step1, the heating and stirring speed is 4200-5500 rpm, and the time is 2-3 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| JPH0269912A (en) * | 1988-09-05 | 1990-03-08 | Shizuki Denki Seisakusho:Kk | Oil immersed metallized film capacitor |
| CN1967751A (en) * | 2005-11-14 | 2007-05-23 | 通用电气公司 | Film capacitors with improved dielectric properties |
| CN103943359A (en) * | 2014-04-22 | 2014-07-23 | 无锡宏广电容器有限公司 | Composite impregnant capable of substantially prolonging service life of metallic film capacitor and preparation method thereof |
| CN106571227A (en) * | 2016-10-26 | 2017-04-19 | 安徽飞达电气科技有限公司 | High performance capacitor impregnating agent |
| CN106683884A (en) * | 2016-12-13 | 2017-05-17 | 宁国市大荣电器有限公司 | Multi-component rapeseed oil impregnant for capacitor |
| CN108806981A (en) * | 2018-06-11 | 2018-11-13 | 铜陵市胜美达电子制造有限公司 | A kind of preparation method of capacitor impregnant |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US3273032A (en) * | 1960-01-19 | 1966-09-13 | Bendix Corp | Electrical condensers and method of making the same |
| JPS51118099A (en) * | 1975-04-10 | 1976-10-16 | Matsushita Electric Ind Co Ltd | Condenser |
| JPH0269912A (en) * | 1988-09-05 | 1990-03-08 | Shizuki Denki Seisakusho:Kk | Oil immersed metallized film capacitor |
| CN1967751A (en) * | 2005-11-14 | 2007-05-23 | 通用电气公司 | Film capacitors with improved dielectric properties |
| CN103943359A (en) * | 2014-04-22 | 2014-07-23 | 无锡宏广电容器有限公司 | Composite impregnant capable of substantially prolonging service life of metallic film capacitor and preparation method thereof |
| CN106571227A (en) * | 2016-10-26 | 2017-04-19 | 安徽飞达电气科技有限公司 | High performance capacitor impregnating agent |
| CN106683884A (en) * | 2016-12-13 | 2017-05-17 | 宁国市大荣电器有限公司 | Multi-component rapeseed oil impregnant for capacitor |
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Application publication date: 20191206 |