CN115116751A - Aluminum electrolytic capacitor electrolyte, preparation method thereof and aluminum electrolytic capacitor - Google Patents
Aluminum electrolytic capacitor electrolyte, preparation method thereof and aluminum electrolytic capacitor Download PDFInfo
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- CN115116751A CN115116751A CN202210852812.3A CN202210852812A CN115116751A CN 115116751 A CN115116751 A CN 115116751A CN 202210852812 A CN202210852812 A CN 202210852812A CN 115116751 A CN115116751 A CN 115116751A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
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- H01G9/022—Electrolytes; Absorbents
- H01G9/035—Liquid electrolytes, e.g. impregnating materials
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/145—Liquid electrolytic capacitors
Abstract
The invention discloses an electrolyte of an aluminum electrolytic capacitor, which comprises the following components in parts by weight: 40-60 parts of main solvent, 8-20 parts of auxiliary solvent, 15-25 parts of main solute, 5-10 parts of auxiliary solute and 1-4 parts of additive; the preparation method of the electrolyte comprises the following steps: heating the main solvent to 80-90 ℃, adding the auxiliary solvent, mixing, heating to 130-plus 140 ℃, adding the main solute and the auxiliary solute, carrying out heat preservation and stirring, then cooling to 120-plus 125 ℃, adding the flash voltage enhancer and the waterproof auxiliary agent, carrying out heat preservation and stirring, cooling to 100-plus 105 ℃, finally adding the hydrogen scavenger, carrying out heat preservation and stirring, and naturally cooling to room temperature to obtain the electrolyte of the aluminum electrolytic capacitor; the main solute is the binary hydroxyl dicarboxylic ammonium salt containing symmetrical hydroxyl groups, so that the solubility of the binary hydroxyl dicarboxylic ammonium salt in a solvent is greatly improved, the solute cannot be separated out from the prepared electrolyte at low temperature, the low-temperature working requirement of an electrolytic capacitor can be met, and the prepared aluminum electrolytic capacitor can have a wider application temperature range.
Description
Technical Field
The invention belongs to the technical field of capacitors, relates to an electrolyte, and particularly relates to an aluminum electrolytic capacitor electrolyte, a preparation method thereof and an aluminum electrolytic capacitor.
Background
The physical and chemical properties of the aluminum electrolytic capacitor determine the basic functions of the electrolytic capacitor. The anode foil of the electrolytic capacitor is a main electron storage material, and under the insulation protection of the oxide film dielectric layer, the movement speed of ions carrying electrons in the cathode electrolyte determines the physical parameters of the electrolytic capacitor; the aluminum electrolytic capacitor is formed by forming a layer of ultrathin oxidation film medium on the surface of an anode foil in an electrolytic mode, sequentially winding the anode foil, non-conductive electrolytic paper and a cathode foil to form a core cladding, impregnating organic electrolyte, adding an outer aluminum shell, arranging an aluminum lead on the upper end of a cover plate of the shell, and finally packaging and sleeving the aluminum lead into a rubber film sleeve pipe to form the capacitor.
The electrolyte of the aluminum electrolytic capacitor provides oxygen anions and electrons in the electrolytic capacitor, and is used for repairing an anode foil oxide film and conducting electrons in the capacitor. The electrolyte of the aluminum electrolytic capacitor mainly comprises a solvent, an organic solute and an additive; the solvent is used as the main part of the electrolyte and is mainly used for dissolving electrolyte solutes, additives and other substances. The electrolyte solution requires a certain temperature range between the melting point and the boiling point of the solvent, and particularly, the solvent has a larger fluidity and a smaller vapor pressure in a high temperature system. The solute is used as the core part of the electrolyte and mainly plays a role in improving the conductivity of the electrolyte, and the electrolyte is generally a binary or polybasic carboxylic acid containing carboxyl or hydroxyl or an ammonium carboxylate. The main reason for selecting ammonium salt is that the pH of the electrolyte is generally required to be neutral or slightly acidic, sodium salt and potassium salt have strong oxidizability and belong to strong alkalis, and on the other hand, sodium salt and potassium salt ions are small and are easy to chemically react with holes of an anode foil to reduce the chemical stability of an anode oxide film, so ammonia gas is the main pH adjusting gas. The additive is a property modifier for the electrolyte. The electrolyte composed of the solvent and the solute meets the requirement of electrolyte testing parameters. However, in the actual use process, the requirements of the capacitor such as the sparking voltage value of the electrolyte, the oxidation efficiency, the consistency with the anode foil and the like are far from being met. The electrolyte additive comprises a sparking voltage improver, a preservative, a hydrogen scavenger, a stabilizer and the like.
Disclosure of Invention
The invention aims to provide an aluminum electrolytic capacitor electrolyte, a preparation method thereof and an aluminum electrolytic capacitor.
The purpose of the invention can be realized by the following technical scheme:
the electrolyte of the aluminum electrolytic capacitor comprises the following components in parts by weight: 40-60 parts of main solvent, 8-20 parts of auxiliary solvent, 15-25 parts of main solute, 5-10 parts of auxiliary solute and 1-4 parts of additive; the main solute is binary hydroxyl dicarboxylic acid ammonium salt, and the structural formula is as follows:
further, the main solvent is ethylene glycol.
Further, the auxiliary solvent is one or a combination of glycerol, gamma-butyrolactone and DMF.
Further, the auxiliary solute is one or a combination of ammonium azelate and ammonium sebacate.
Further, the additives comprise a flash voltage enhancer, a hydrogen scavenger and a hydration-resistant aid.
Further, the sparking voltage enhancer is one or a combination of boric acid, tartaric acid, citric acid and ammonium phosphite; the hydrogen eliminating agent is one of p-nitrobenzoic acid, p-nitrophenol, p-nitrobenzyl alcohol and m-nitroacetophenone; one or more of the waterproof auxiliary agents of phosphoric acid, hypophosphorous acid, mannitol and polypropylene glycol;
the sparking voltage improver accounts for 70-95% of the total weight of the additive;
the hydrogen eliminating agent accounts for 0.5 to 5 percent of the total weight of the additive;
the waterproof auxiliary agent accounts for 0.5-5% of the total weight of the additive.
Further, the preparation method of the binary hydroxyl dicarboxylic acid ammonium salt specifically comprises the following steps:
the first step is as follows: preparation of dihydroxy dicarboxylic acids
Weighing 2, 6-diphenylmethylene cyclohexanone, 0.40 gDL-4-hydroxy-2-ketoglutarate, 70-100mg of catalyst 3-ethyl-5- (2-hydroxyethyl) -4-methylthiazole bromide and 50mg of phase transfer catalyst methyl trioctyl ammonium chloride, adding the mixture into a three-neck flask containing a nitrogen device and a reflux device, then adding 300-500ml of organic solvent 1, 4-dioxane and 50-60ml of triethylamine, introducing nitrogen to replace air in the flask, heating to 90-95 ℃ while stirring, performing Stetter reaction for 6-8h, separating out an aqueous phase after the reaction is finished, adjusting the pH of the aqueous phase to 2.5-3.0 by adopting a 10-15% sulfuric acid aqueous solution, standing for 15-20min, adding 100-150ml of ethyl acetate for extraction, the extract liquid is subjected to rotary evaporation to remove the solvent, and the product is dried in a vacuum drying oven at the temperature of 45-50 ℃ for 8-10h to obtain the binary hydroxy dicarboxylic acid; the catalyst 3-ethyl-5- (2-hydroxyethyl) -4-methylthiazolium bromide has the following structural formula:
the second step: weighing 0.1g of the binary hydroxy dicarboxylic acid prepared in the first step, adding the binary hydroxy dicarboxylic acid into 40-50ml of absolute ethyl alcohol, stirring and dissolving completely, introducing ammonia gas, monitoring the change of the pH value of the solution in real time, stopping introducing the ammonia gas when the pH value keeps alkalescence within 5min, placing the solution in a refrigerator overnight, filtering, and drying in a vacuum drying oven at 45-50 ℃ for 8-10h to obtain the binary hydroxy dicarboxylic acid ammonium salt.
Further, the alkalescence is that the pH value is 7.2-8.0.
A preparation method of an electrolyte of an aluminum electrolytic capacitor comprises the steps of heating a main solvent to 80-90 ℃, adding an auxiliary solvent, mixing, heating to 130-140 ℃, adding a main solute and an auxiliary solute, stirring for 30-45min under heat preservation, then cooling to 120-125 ℃, adding a flash voltage enhancer and a waterproof auxiliary agent, stirring for 30-45min under heat preservation, cooling to 100-105 ℃, finally adding a hydrogen scavenger, stirring for 30-45min under heat preservation, and naturally cooling to room temperature to obtain the electrolyte of the aluminum electrolytic capacitor.
An aluminum electrolytic capacitor comprises an aluminum electrolytic capacitor electrolyte, and the aluminum electrolytic capacitor electrolyte is prepared by the preparation method.
The invention has the beneficial effects that:
the electrolyte of the aluminum electrolytic capacitor prepared by the invention has higher sparking voltage and better temperature stability, the prepared binary hydroxy dicarboxylic acid ammonium salt has good solubility in a main solvent, and is difficult to separate out at low temperature.
Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a mass spectrum of a dibasic hydroxy dicarboxylic acid of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
Example 1
The preparation method of the binary hydroxyl dicarboxylic acid ammonium salt comprises the following steps:
the first step is as follows: preparation of dihydroxy dicarboxylic acids
0.30g2, 6-diphenylmethylene cyclohexanone, 0.40 gDL-4-hydroxy-2-ketoglutarate, 100mg of catalyst 3-ethyl-5- (2-hydroxyethyl) -4-methylthiazole bromide (structural formula of catalyst is as follows:
) 50mg of phase transfer catalyst methyl trioctyl ammonium chloride is added into a three-neck flask containing a nitrogen device and a reflux device, 400ml of organic solvent 1, 4-dioxane and 60ml of triethylamine are added, nitrogen is introduced to replace air in the flask, the temperature is raised to 90 ℃ while stirring, Stetter reaction is carried out for 8 hours, after the reaction is finished, a water phase is separated, 15% sulfuric acid aqueous solution is adopted to adjust the pH value of the water phase to be 2.5-3.0, standing is carried out for 15min, 150ml of ethyl acetate is added for extraction, the solvent is removed by rotary evaporation of an extraction liquid, and a product is dried in a vacuum drying oven at 50 ℃ for 10 hours, so that the binary hydroxy dicarboxylic acid is obtained; FIG. 1 shows the mass spectrum of the dibasic hydroxy dicarboxylic acid, MS (C) 28 H 30 O 9 )：m/z＝510.12380。
The second step is that: weighing 0.1g of the binary hydroxy dicarboxylic acid prepared in the first step, adding the binary hydroxy dicarboxylic acid into 50ml of absolute ethyl alcohol, stirring and dissolving completely, introducing ammonia gas, monitoring the change of the pH value of the solution in real time, stopping introducing the ammonia gas when the pH value is kept between 7.2 and 8.0 within 5min, placing the solution in a refrigerator overnight, filtering, and drying in a vacuum drying oven at 50 ℃ for 10 hours to obtain the binary hydroxy dicarboxylic acid ammonium salt.
Solubility test of ammonium salt of dibasic hydroxy dicarboxylic acid: at room temperature, dissolving binary hydroxyl dicarboxylic acid ammonium salt in 100ml of glycol solution until solute can not be completely dissolved, wherein the concentration is the upper limit of dissolution; the maximum dissolved ethylene glycol concentration of the dibasic hydroxy dicarboxylic acid ammonium salt was measured to be 42.6% (mass concentration).
Example 2
Electrolyte of the aluminum electrolytic capacitor: 50g of ethylene glycol as the primary solvent, 10g of gamma-butyrolactone and 5g of DMF as the secondary solvent, 18g of the primary solute dibasic hydroxy dicarboxylic acid ammonium salt (prepared in example 1), 6g of the secondary solute ammonium sebacate, and additives (3g of boric acid, 0.6g of citric acid, 0.1g of p-nitrobenzoic acid, 0.02g of phosphoric acid, 0.02g of hypophosphorous acid, 0.03g of mannitol);
heating the main solvent to 90 ℃, adding the auxiliary solvent, heating to 140 ℃ after mixing, adding the main solute and the auxiliary solute, stirring for 30min under heat preservation, then cooling to 120 ℃, adding the flash voltage improver and the waterproof auxiliary agent, stirring for 30min under heat preservation, cooling to 100 ℃, finally adding the hydrogen scavenger, stirring for 30min under heat preservation, and naturally cooling to room temperature to obtain the electrolyte of the aluminum electrolytic capacitor. The conductivity of the prepared electrolyte measured by a Shanghai Lei magnetic DDSJ-308F desk type conductivity meter is 2.28ms/cm, and the average flashover voltage value of the prepared electrolyte measured by a Yangzhou Baohou TV-1CH type intelligent TV tester is 491V.
Example 3
Electrolyte of the aluminum electrolytic capacitor: 55g of ethylene glycol as a primary solvent, 8g of glycerol and 5g of DMF as a secondary solvent, 20g of ammonium dihydroxydicarboxylate salt as a primary solute (prepared in example 1), 10g of ammonium azelate as a secondary solute, and additives (3.5g of boric acid, 0.7g of citric acid, 0.2g of p-nitrophenol, 0.04g of phosphoric acid, 0.1g of hypophosphorous acid, 0.03g of polyallylic alcohol);
heating the main solvent to 85 ℃, adding the auxiliary solvent, heating to 135 ℃ after mixing, adding the main solute and the auxiliary solute, stirring for 30min under heat preservation, then cooling to 125 ℃, adding the flash voltage improver and the waterproof auxiliary agent, stirring for 30min under heat preservation, cooling to 105 ℃, finally adding the hydrogen scavenger, stirring for 45min under heat preservation, and naturally cooling to room temperature to obtain the electrolyte of the aluminum electrolytic capacitor. The conductivity of the prepared electrolyte measured by a Shanghai Lei magnetic DDSJ-308F desk type conductivity meter is 2.24ms/cm, and the average flashover voltage value of the prepared electrolyte measured by a Yangzhou Baohou TV-1CH type intelligent TV tester is 498V.
Example 4
Electrolyte of the aluminum electrolytic capacitor: 60g of main solvent ethylene glycol, 10g of auxiliary solvent glycerol and 5g of DMF, 25g of main solute dibasic hydroxy dicarboxylic acid ammonium salt (prepared in example 1), 8g of ammonium azelate as auxiliary solute, additives (3.1g of boric acid, 0.1g of tartaric acid, 0.1g of ammonium phosphite, 0.15g of m-nitroacetophenone, 0.06g of phosphoric acid, 0.03g of mannitol, 0.05g of polyallylene alcohol);
heating the main solvent to 90 ℃, adding the auxiliary solvent, heating to 140 ℃ after mixing, adding the main solute and the auxiliary solute, stirring for 45min under heat preservation, then cooling to 125 ℃, adding the flash voltage improver and the waterproof auxiliary agent, stirring for 30min under heat preservation, cooling to 100 ℃, finally adding the hydrogen scavenger, stirring for 30min under heat preservation, and naturally cooling to room temperature to obtain the electrolyte of the aluminum electrolytic capacitor. The conductivity of the prepared electrolyte measured by a Shanghai Lei magnetic DDSJ-308F desk type conductivity meter is 2.28ms/cm, and the average flashover voltage value of the prepared electrolyte measured by a Yangzhou Baohou TV-1CH type intelligent TV tester is 495V.
Example 5
Electrolyte of the aluminum electrolytic capacitor: 40g of ethylene glycol as primary solvent, 15g of glycerol and 5g of DMF as secondary solvent, 20g of ammonium dihydroxydicarboxylate (prepared in example 1) as primary solute, 3g of ammonium hydrogennonanedioate and 3g of ammonium sebacate as secondary solute, additives (2.7g of boric acid, 0.8g of citric acid, 0.8g of ammonium phosphite, 0.18g of p-nitrobenzyl alcohol, 0.06g of phosphoric acid, 0.04g of hypophosphorous acid, 0.06g of polypropylene glycol);
heating the main solvent to 85 ℃, adding the auxiliary solvent, heating to 130 ℃ after mixing, adding the main solute and the auxiliary solute, stirring for 45min under heat preservation, then cooling to 120 ℃, adding the flash voltage improver and the waterproof auxiliary agent, stirring for 45min under heat preservation, cooling to 105 ℃, finally adding the hydrogen scavenger, stirring for 40min under heat preservation, and naturally cooling to room temperature to obtain the electrolyte of the aluminum electrolytic capacitor. The conductivity of the prepared electrolyte measured by a Shanghai Lei magnetic DDSJ-308F desk type conductivity meter is 2.26ms/cm, and the average flashover voltage value of the prepared electrolyte measured by a Yangzhou Baohou TV-1CH type intelligent TV tester is 496V.
Comparative example 1
Electrolyte of the aluminum electrolytic capacitor: 40g of ethylene glycol as a primary solvent, 15g of glycerol and 5g of DMF as a secondary solvent, 10g of ammonium dihydroxydicarboxylate (prepared in example 1) as a primary solute, 10g of ammonium hydrogenazelate and 10g of ammonium sebacate as a secondary solute, and additives (2.7g of boric acid, 0.8g of citric acid, 0.8g of ammonium phosphite, 0.18g of p-nitrobenzyl alcohol, 0.06g of phosphoric acid, 0.04g of phosphorous acid, 0.06g of polyallyl alcohol);
heating the main solvent to 85 ℃, adding the auxiliary solvent, heating to 130 ℃ after mixing, adding the main solute and the auxiliary solute, stirring for 45min under heat preservation, then cooling to 120 ℃, adding the flash voltage improver and the waterproof auxiliary agent, stirring for 45min under heat preservation, cooling to 105 ℃, finally adding the hydrogen scavenger, stirring for 40min under heat preservation, and naturally cooling to room temperature to obtain the electrolyte of the aluminum electrolytic capacitor. The conductivity of the prepared electrolyte measured by a Shanghai Lei magnetic DDSJ-308F desk type conductivity meter is 2.08ms/cm, and the average flashover voltage value of the prepared electrolyte measured by a Yangzhou Baohou TV-1CH type intelligent TV tester is 485V.
Comparative example 2
Electrolyte of the aluminum electrolytic capacitor: 40g of ethylene glycol as a primary solvent, 15g of glycerol as a secondary solvent and 5g of DMF, 20g of ammonium dihydroxy dicarboxylates as primary solute ammonium azelate (prepared in example 1), 10g of ammonium sebacate as a secondary solute, additives (2.7g of boric acid, 0.8g of citric acid, 0.8g of ammonium phosphite, 0.18g of p-nitrobenzyl alcohol, 0.06g of phosphoric acid, 0.04g of hypophosphorous acid, 0.06g of polypropylene alcohol);
heating the main solvent to 85 ℃, adding the auxiliary solvent, heating to 130 ℃ after mixing, adding the main solute and the auxiliary solute, stirring for 45min under heat preservation, then cooling to 120 ℃, adding the flash voltage improver and the waterproof auxiliary agent, stirring for 45min under heat preservation, cooling to 105 ℃, finally adding the hydrogen scavenger, stirring for 40min under heat preservation, and naturally cooling to room temperature to obtain the electrolyte of the aluminum electrolytic capacitor. The conductivity of the prepared electrolyte measured by a Shanghai Lei magnetic DDSJ-308F desk type conductivity meter is 1.85ms/cm, and the average flashover voltage value of the prepared electrolyte measured by a Yangzhou Baohou TV-1CH type intelligent TV tester is 457V.
Low temperature resistance test
The electrolytes prepared in examples 2 to 5 and comparative examples 1 to 2 were each placed in an environment at a temperature of-25 ℃ and left to stand for 24 hours, and then the state of each electrolyte was observed.
The electrolyte prepared by the method has good low-temperature resistance, can meet the low-temperature working requirement of the electrolytic capacitor, and can be prepared into the aluminum electrolytic capacitor with a wider use temperature range.
The foregoing is merely exemplary and illustrative of the principles of the present invention and various modifications, additions and substitutions of the specific embodiments described herein may be made by those skilled in the art without departing from the principles of the present invention or exceeding the scope of the claims set forth herein.
Claims (10)
1. The electrolyte of the aluminum electrolytic capacitor is characterized by comprising the following components in parts by weight: 40-60 parts of main solvent, 8-20 parts of auxiliary solvent, 15-25 parts of main solute, 5-10 parts of auxiliary solute and 1-4 parts of additive; the main solute is dibasic hydroxyl dicarboxylic acid ammonium salt, and the structural formula is as follows:
2. the aluminum electrolytic capacitor electrolyte of claim 1 wherein the primary solvent is ethylene glycol.
3. The aluminum electrolytic capacitor electrolyte as recited in claim 1, wherein the auxiliary solvent is one or more of glycerol, γ -butyrolactone, and DMF.
4. The aluminum electrolytic capacitor electrolyte as recited in claim 1 wherein the auxiliary solute is one or more of ammonium hydrogen azelate and ammonium sebacate.
5. The aluminum electrolytic capacitor electrolyte of claim 1, wherein the additives comprise a sparking voltage enhancer, a hydrogen scavenger and a water proofing additive.
6. The electrolyte of an aluminum electrolytic capacitor according to claim 5, wherein the sparking voltage enhancer is one or more of boric acid, tartaric acid, citric acid, ammonium phosphite; the hydrogen eliminating agent is one of p-nitrobenzoic acid, p-nitrophenol, p-nitrobenzyl alcohol and m-nitroacetophenone; one or more of phosphoric acid, hypophosphorous acid, mannitol and polypropylene glycol as waterproof auxiliary agents;
the sparking voltage improver accounts for 70-95% of the total weight of the additive;
the hydrogen eliminating agent accounts for 0.5 to 5 percent of the total weight of the additive;
the waterproof auxiliary agent accounts for 0.5-5% of the total weight of the additive.
7. The electrolyte for the aluminum electrolytic capacitor according to claim 1, wherein the preparation method of the binary hydroxy dicarboxylic acid ammonium salt specifically comprises the following steps:
the first step is as follows: preparation of dihydroxy dicarboxylic acids
Weighing 2, 6-diphenylmethylene cyclohexanone 0.27-0.30g, 0.38-0.42 gDL-4-hydroxy-2-ketoglutarate, 70-100mg of catalyst 3-ethyl-5- (2-hydroxyethyl) -4-methylthiazole bromide and 50-60mg of phase transfer catalyst methyl trioctyl ammonium chloride, adding into a three-neck flask containing a nitrogen device and a reflux device, then adding 300 ml of organic solvent 1, 4-dioxane and 50-60ml of triethylamine, introducing nitrogen to replace air in the flask, heating to 90-95 ℃ while stirring, carrying out Stetter reaction for 6-8h, separating out an aqueous phase after the reaction is finished, adjusting the pH of the aqueous phase to 2.5-3.0 by using a 10-15% sulfuric acid aqueous solution, standing for 15-20min, adding 100-150ml ethyl acetate for extraction, carrying out rotary evaporation on the extract liquid to remove the solvent, and drying the product in a vacuum drying oven at the temperature of 45-50 ℃ for 8-10h to obtain the binary hydroxy dicarboxylic acid;
the catalyst 3-ethyl-5- (2-hydroxyethyl) -4-methylthiazolium bromide has the following structural formula:
the second step is that: weighing 0.1g of the binary hydroxy dicarboxylic acid prepared in the first step, adding the binary hydroxy dicarboxylic acid into 40-50ml of absolute ethyl alcohol, stirring and dissolving completely, introducing ammonia gas, monitoring the change of the pH value of the solution in real time, stopping introducing the ammonia gas when the pH value keeps alkalescence within 5min, placing the solution in a refrigerator overnight, filtering, and drying in a vacuum drying oven at 45-50 ℃ for 8-10h to obtain the binary hydroxy dicarboxylic acid ammonium salt.
8. The electrolyte for aluminum electrolytic capacitors as claimed in claim 1, wherein the weak alkalinity is a pH of 7.2 to 8.0.
9. The method for preparing the electrolyte of the aluminum electrolytic capacitor according to claims 1 to 8, which is characterized by comprising the following steps: heating the main solvent to 80-90 ℃, adding the auxiliary solvent, heating to 130-140 ℃ after mixing, adding the main solute and the auxiliary solute, stirring for 30-45min under heat preservation, then cooling to 120-125 ℃, adding the flash fire voltage enhancer and the waterproof auxiliary agent, stirring for 30-45min under heat preservation, cooling to 100-105 ℃, finally adding the hydrogen scavenger, stirring for 30-45min under heat preservation, and naturally cooling to room temperature to obtain the electrolyte of the aluminum electrolytic capacitor.
10. An aluminum electrolytic capacitor comprising an aluminum electrolytic capacitor electrolyte prepared by the method of claim 9.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116612997A (en) * | 2023-07-21 | 2023-08-18 | 深圳市新中元电子有限公司 | Composite electrolyte for electrolytic capacitor |
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| CN106384671A (en) * | 2016-10-21 | 2017-02-08 | 新疆众和股份有限公司 | Mixed acid electrolyte |
| CN112837939A (en) * | 2021-01-07 | 2021-05-25 | 深圳中元电子有限公司 | High-temperature-resistant high-voltage electrolyte and aluminum electrolytic capacitor using same |
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| GB2041646A (en) * | 1979-02-02 | 1980-09-10 | Pye Ltd | Electrolytic capacitors |
| JP2002043182A (en) * | 2001-06-26 | 2002-02-08 | Mitsubishi Chemicals Corp | Electrolyte for electrolytic capacitor, and electrolytic capacitor using the same |
| JP2004221557A (en) * | 2002-12-25 | 2004-08-05 | Sanyo Chem Ind Ltd | Electrolyte |
| CN101206955A (en) * | 2007-12-14 | 2008-06-25 | 广州市二轻工业科学技术研究所 | Branched chain polybasic carboxylic acid ammonium salt mixture as well as preparation method and application thereof |
| CN106384671A (en) * | 2016-10-21 | 2017-02-08 | 新疆众和股份有限公司 | Mixed acid electrolyte |
| CN112837939A (en) * | 2021-01-07 | 2021-05-25 | 深圳中元电子有限公司 | High-temperature-resistant high-voltage electrolyte and aluminum electrolytic capacitor using same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116612997A (en) * | 2023-07-21 | 2023-08-18 | 深圳市新中元电子有限公司 | Composite electrolyte for electrolytic capacitor |
| CN116612997B (en) * | 2023-07-21 | 2023-12-01 | 深圳市新中元电子有限公司 | Composite electrolyte for electrolytic capacitor |
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