KR101211928B1 - An electrolyte for an electrolytic condenser - Google Patents

Abstract

In the present invention, ethylene glycol is used as the main solvent, and 3 to 10 wt% of the main solvent, 10 to 30 wt% of the subsolvent, 0.1 to 3 wt% of the pressure resistance improver, and 0.05 to 3 wt% of P-nitrobenzoic acid, and the remainder of which contains ethylene glycol. The present invention relates to an electrolytic capacitor electrolytic solution that improves voltage and has stable reliability characteristics at high voltages of 450 to 500 v.

Description

An electrolyte for an electrolytic condenser

The present invention relates to an electrolyte for an electrolytic capacitor, and more particularly, to an electrolyte for an electrolytic capacitor having improved reliability with high reliability at high voltages.

In general, an electrolytic capacitor is one of electric components, and is mainly used for power circuits or noise filters in digital circuits for various electromagnetic products.

Such electrolytic capacitors include aluminum electrolytic capacitors, tantalum electrolytic capacitors, ceramic electrolytic capacitors, film electrolytic capacitors, electric double layer electrolytic capacitors, and the like.

In particular, the demand for high voltage capacitors for set power supplies is increasing, and accordingly, the development of electrolyte for high voltage capacitors is also actively progressing. In order to improve the internal pressure of the electrolyte, PVA, etc. was mainly used in the past. Accordingly, a stable electrolyte at high pressure is required by using an additive while satisfying high temperature characteristics and having a low viscosity.

The present invention solves the problems of the prior art as described above, and has an object of providing an electrolytic capacitor electrolyte solution having a stable reliability characteristics at high voltage of 450 ~ 500v class by improving the withstand voltage.

In order to accomplish the object of the present invention as described above,

Electrolyte containing ethylene glycol as the main solvent and containing 3 to 10 wt% of the main solute, 10 to 30 wt% of the subsolvent, 0.1 to 3 wt% of the pressure-resistant improving agent, and 0.05 to 3 wt% of P-nitrobenzoic acid. An electrolytic solution for capacitors is provided.

The main solute is preferably ammonium 2-butyloctanedioate or ammonium 12-vinyl-8-octadecadioate.

In addition, the subsolvent may be Benzyl alcohol (Benzyl alcohol) or butyl carbitol (Butyl carbitol), the pressure-resistant improver is preferably using SiO ₂ and / or β-Citronellol (β-Citronellol).

Ammonium 2-butyloctanedioate or ammonium 12-vinyl-8-octadecadiate is the main solute that determines the resistivity of the electrolyte, and the resistivity is too high at 3% or less. Since the withstand voltage may be lowered, the above-mentioned range is used. Benzyl alcohol, which is a non-solvent, is used for improving the pressure resistance, and has no effect of improving the pressure resistance at 10% or less, and has a high resistivity at 30% or more. Shall be.

Butyl carbitol, which is another subsolvent, is a subsolvent for improving the pressure resistance, and has no effect of improving the pressure resistance at 10% or less, and has a high resistivity at 30% or more.

In addition, SiO ₂ and β-citronolol, which are pressure-improving agents, are in the above range because they have no effect of improving the pressure resistance at 0.1% or less and lower reliability characteristics at 3% or more.

In addition, the nitro compound P-nitrobenzoic acid serves to maintain the reliability characteristics for a long time, the desired characteristic effect is less than 0.05%, if more than 3% falls within the breakdown voltage characteristics, such as adverse effects are concerned in the above range.

According to the present invention, by using benzyl alcohol or butyl carbitol as an auxiliary solvent, it is possible to improve the internal pressure of the electrolyte and to provide an electrolyte having improved internal pressure by using other additives, thereby providing stable reliability at high voltages of 450 to 500v. Since it is possible to provide an electrolyte for an electrolytic capacitor having, it is easy to provide a capacitor for use at high temperatures.

Hereinafter, the present invention will be described in more detail with reference to preferred embodiments. However, the following examples are intended to help those of ordinary skill in the art to which the present invention pertains, but the present invention is not limited thereto.

[ Example ]

For the description through the practice of the present invention, the examples and comparative examples of the content of each component of the present invention are shown in the following table.

Specific resistance and breakdown voltage characteristics according to composition Electrolyte composition Resistivity
Ω
(30 ℃) Withstand voltage
V
Electrolyte Ethylene glycol P-nitrobenzoic acid
Solvent
Withstand pressure improver
ingredient
weight%
weight
weight Benzyl alcohol
weight Butyl
Carbitol
weight SiO ₂
weight β-citronerole
weight Comparative Example
One



Ammonium 2-Butyloctandioic acid






7 93 600 450 Example
1-1 79 One 20 650 470 Example
1-2 79 One 20 657 470 Example
1-3 78.7 One 20 0.3 697 480 Example
1-4 78 One 20 One 705 480 Example
1-5 78.7 One 20 0.3 Insoluble Example
1-6 78 One 20 One 717 475 Example
1-7 77.7 One 20 0.3 One 700 485 Example
1-8 77.7 One 20 0.3 One Insoluble Comparative Example
2



Ammonium 12-Vinyl-8-octadecenedioic acid






4 96 823 460 Example
2-1 79 One 20 910 490 Example
2-2 79 One 20 923 490 Example
2-3 78.7 One 20 0.3 944 520 Example
2-4 78 One 20 One 970 515 Example
2-5 78 One 20 One 1103 510 Example
2-6 77.5 One 20 1.5 982 530 Example
2-7 75.5 One 20 3.5 1130 520 Example 2-8 77.7 One 20 0.3 One 974 525

Reliability Characteristics by Composition 450WV 53uF Ф10 × 50 (mm) Early 105 ° C after 2,000 hours Volume tan δ L / C (㎂) Capacity change rate,% tan δ L / C (㎂) Comparative Example 1 A / G impossibility Example 1-1 A / G impossibility Examples 1-2 A / G impossibility Example 1-3 46.7 0.061 16 -1.7 0.092 24 Example 1-4 45.7 0.062 17 -3.6 0.088 27 Example 1-5 46.9 0.065 21 -4.9 0.126 36 Examples 1-6 46.3 0.062 13 -2.6 0.118 31 500WV 470uF Ф30 × 50 (mm) Early 105 ° C after 2,000 hours Volume tan δ L / C (㎂) Capacity change rate,% tan δ L / C (㎂) Comparative Example 2 A / G impossibility Example 2-1 A / G impossibility Example 2-2 A / G impossibility Example 2-3 424 0.057 142 -0.8 0.095 85 Examples 2-4 421 0.059 153 -1.9 0.117 80 Example 2-5 426 0.063 141 -2.2 0.109 81 Example 2-6 424 0.057 155 Corrosion occurrence, lead plate disconnection Example 2-7 422 0.072 153 VENT bloat and leak Example 2-8 424 0.054 167 -1.2 0.092 81

As can be seen from the above table, it can be seen that ammonium 12-vinyl-8-octadecadiate having a longer C chain than ammonium 2-butyloctanedioate is superior in withstand voltage but inferior in resistivity. When only the subsolvent was added, the withstand voltage increased, but the withstand voltage did not increase as much as WV.

In addition, it can be used as a 450V class electrolyte solution using ammonium 2-butyloctanedioate as the main solute and subsolvents and additives, and the use of subsolvents and additives using ammonium 12-vinyl-8-octatecardioate as the main solute It can be seen that it can be used as a 500V class electrolyte.

In addition, excessive use of SiO ₂ in the electrolyte causes corrosion and excessive use of citronolol results in VENT swelling and liquid generation.However, as shown in the examples, an appropriate amount of subsolvent and additives may be used at the same time. When the 450 ~ 500V reliability characteristics are good.

Claims (4)

In electrolyte solution for electrolytic capacitors,
Using ethylene glycol as the main solvent, 3 to 10 wt% of the main solute, which is ammonium 2-butyloctanedioate or ammonium 12-vinyl-8-octadecadiate, 10 to 30 wt% of the subsolvent, and 0.1 to 3 wt% of the pressure resistance improver. And an electrolyte solution for an electrolytic capacitor, comprising 0.05 to 3 wt% of P-nitrobenzoic acid and containing the remaining ethylene glycol. delete The electrolyte solution for an electrolytic capacitor according to claim 1, wherein the subsolvent is benzyl alcohol or butyl carbitol. The electrolyte solution for an electrolytic capacitor according to claim 1, wherein the pressure resistance improving agent is at least one selected from SiO ₂ and β-citronolol.