Electrolyte for driving aluminum electrolytic capacitor and preparation method thereof

Abstract

The invention relates to the technical field of electrolyte, in particular to electrolyte for driving an aluminum electrolytic capacitor and a preparation method of the electrolyte. The electrolyte is prepared from the following raw materials in parts by weight: 80 to 90 parts of ethylene glycol, 3 to 5 parts of butyl suberic acid, 5 to 7 parts of ammonium sebacate, 0.5 to 2 parts of ammonium pentaborate, 0.1 to 1.5 parts of p-nitrobenzyl alcohol and 0.2 to 3 parts of glyoxal tripolymer dihydrate. According to the electrolyte for driving the aluminum electrolytic capacitor, the influence on reduction of the conductivity is small, the withstand voltage is improved, and the problems that high-molecular compounds such as PVA and PEG are adopted in a traditional electrolyte to improve the withstand voltage value and reduce the saturated vapor pressure, but the conductivity is seriously influenced, and the impedance is increased can be effectively solved; the sparking voltage of the electrolyte is high, the safety and stability of the electrolyte are guaranteed, the conductivity of the electrolyte is not reduced, and the service life is long. The preparation method of the electrolyte is simple in process, convenient to operate and high in production efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of electrolytes, and in particular to an electrolyte for driving an aluminum electrolytic capacitor and a preparation method thereof. Background Art

[0002] Aluminum electrolytic capacitors have the advantages of large capacity and low price, and are widely used in industries such as computers, automotive electronics, and household appliances. With the continuous improvement of the performance and quality of electronic products and the expansion of the application range of aluminum electrolytic capacitors, people have put forward higher requirements for the performance of aluminum electrolytic capacitors. The market demand for aluminum electrolytic capacitors with better performance, higher stability, and longer service life is also increasing.

[0003] In order to improve the pressure resistance of the electrolyte, traditional electrolytes often use polymer compounds such as PVA and PEG to increase the pressure resistance and reduce the saturated vapor pressure. However, the above polymer compounds will seriously affect the conductivity of the electrolyte and increase the impedance. The conductivity of the electrolyte has a significant impact on the performance of aluminum electrolytic capacitors, which directly affects the performance of aluminum electrolytic capacitors, including its capacitance, equivalent series resistance (ESR) value, and overall working efficiency. The higher the conductivity of the electrolyte, the better the conductivity of the aluminum electrolytic capacitor, which can provide a larger current and lower resistance, thereby improving the performance of the capacitor. Therefore, in response to the above problems, the electrolyte needs to be further improved. Summary of the invention

[0004] In order to solve the deficiencies of the above-mentioned prior art, one of the objects of the present invention is to provide an electrolyte for driving an aluminum electrolytic capacitor, wherein the electrolyte has a high flash voltage, which is beneficial to ensuring the safety and stability of the electrolyte, and has little effect on the reduction of conductivity, thereby effectively improving the service life and stability of the capacitor.

[0005] Another object of the present invention is to provide a method for preparing an electrolyte for driving an aluminum electrolytic capacitor. The method for preparing the electrolyte has a simple process, is easy to control, has high production efficiency, and the quality of the prepared electrolyte product is stable, which is conducive to industrial production.

[0006] The purpose of the present invention is achieved through the following technical scheme: an electrolyte for driving an aluminum electrolytic capacitor, comprising the following raw materials in parts by weight: 80-90 parts of ethylene glycol, 3-5 parts of butyl suberic acid, 5-7 parts of ammonium sebacate, 0.5-2 parts of ammonium pentaborate, 0.1-1.5 parts of p-nitrobenzyl alcohol, and 0.2-3 parts of glyoxal trimer dihydrate.

[0007] Furthermore, the aluminum electrolytic capacitor driving electrolyte comprises the following raw materials in parts by weight: 86.5-88.3 parts of ethylene glycol, 3-5 parts of butyl suberic acid, 5-7 parts of ammonium sebacate, 0.5-2 parts of ammonium pentaborate, 0.5-1 parts of p-nitrobenzyl alcohol, and 0.2-2 parts of glyoxal trimer dihydrate.

[0008] Furthermore, the aluminum electrolytic capacitor driving electrolyte includes the following raw materials in parts by weight: 88.3 parts of ethylene glycol, 4 parts of butyl suberic acid, 6 parts of ammonium sebacate, 1 part of ammonium pentaborate, 0.5 parts of p-nitrobenzyl alcohol, and 0.2 parts of glyoxal trimer dihydrate.

[0009] Furthermore, the aluminum electrolytic capacitor driving electrolyte includes the following raw materials in parts by weight: 88 parts of ethylene glycol, 4 parts of butyl suberic acid, 6 parts of ammonium sebacate, 1 part of ammonium pentaborate, 0.5 parts of p-nitrobenzyl alcohol, and 0.5 parts of glyoxal trimer dihydrate.

[0010] Furthermore, the aluminum electrolytic capacitor driving electrolyte includes the following raw materials in parts by weight: 87.5 parts of ethylene glycol, 4 parts of butyl suberic acid, 6 parts of ammonium sebacate, 1 part of ammonium pentaborate, 0.5 parts of p-nitrobenzyl alcohol, and 1 part of glyoxal trimer dihydrate.

[0011] Furthermore, the aluminum electrolytic capacitor driving electrolyte includes the following raw materials in parts by weight: 86.5 parts of ethylene glycol, 4 parts of butyl suberic acid, 6 parts of ammonium sebacate, 1 part of ammonium pentaborate, 0.5 parts of p-nitrobenzyl alcohol, and 2 parts of glyoxal trimer dihydrate.

[0012] The present invention obtains an electrolyte for driving aluminum electrolytic capacitors that can reduce saturated vapor pressure and improve withstand voltage while having little effect on resistivity reduction by compounding glyoxal trimer dihydrate with ethylene glycol, butyl suberic acid, ammonium sebacate, ammonium pentaborate, p-nitrobenzyl alcohol and other raw materials. The electrolyte can effectively solve the problem that high molecular compounds such as PVA, PEG, etc. used in traditional electrolytes to increase withstand voltage and reduce saturated vapor pressure will seriously affect conductivity and increase impedance, which is beneficial to ensuring the performance and reliability of aluminum electrolytic capacitors. Among them, the boiling point of glyoxal trimer dihydrate is 453°C, and its structural formula is as follows:

[0013] The present invention can effectively improve the flash voltage of the electrolyte by adding glyoxal trimer dihydrate, which is beneficial to ensuring the safety and stability of the electrolyte, and the influence of the reduction of the conductivity of the electrolyte is small, and the service life is long.

[0014] Another object of the present invention is achieved by the following technical solution: A method for preparing the above-mentioned aluminum electrolytic capacitor driving electrolyte comprises the following steps: (1) Take ethylene glycol, butyl suberic acid, ammonium sebacate, ammonium pentaborate, p-nitrobenzyl alcohol and glyoxal trimer dihydrate in proportion; (2) Ethylene glycol, butyl suberic acid, ammonium sebacate, ammonium pentaborate, p-nitrobenzyl alcohol and glyoxal trimer dihydrate are uniformly mixed to obtain an electrolyte.

[0015] Furthermore, in the step (2), ethylene glycol, butyl suberic acid, ammonium sebacate, ammonium pentaborate, p-nitrobenzyl alcohol and glyoxal trimer dihydrate are mixed and stirred uniformly at a temperature of 85-95° C. to obtain an electrolyte.

[0016] The beneficial effects of the present invention are as follows: the present invention compounds glyoxal trimer dihydrate with ethylene glycol, butyl suberic acid, ammonium sebacate, ammonium pentaborate, p-nitrobenzyl alcohol and other raw materials to obtain an electrolyte for driving aluminum electrolytic capacitors that has little effect on reducing conductivity and improves withstand voltage, which can effectively solve the problem that high molecular compounds such as PVA, PEG, etc. used in traditional electrolytes to improve withstand voltage and reduce saturated vapor pressure, but will seriously affect conductivity and increase impedance; the flash voltage of the electrolyte prepared by the present invention is relatively high, which is beneficial to ensuring the safety and stability of the electrolyte, and has little effect on the conductivity of the electrolyte and a long service life. The preparation method of the electrolyte for driving aluminum electrolytic capacitors is simple in process, easy to operate, high in production efficiency, and conducive to industrial production. DETAILED DESCRIPTION

[0017] In order to facilitate the understanding of those skilled in the art, the present invention is further described below in conjunction with embodiments, and the contents mentioned in the implementation modes are not intended to limit the present invention.

[0018] In some embodiments of the present invention, an electrolyte for driving an aluminum electrolytic capacitor includes the following raw materials in parts by weight: 80-90 parts of ethylene glycol, 3-5 parts of butyl suberic acid, 5-7 parts of ammonium sebacate, 0.5-2 parts of ammonium pentaborate, 0.1-1.5 parts of p-nitrobenzyl alcohol, and 0.2-3 parts of glyoxal trimer dihydrate.

[0019] In some embodiments of the present invention, the aluminum electrolytic capacitor driving electrolyte comprises the following raw materials in parts by weight: 86.5-88.3 parts of ethylene glycol, 3-5 parts of butyl suberic acid, 5-7 parts of ammonium sebacate, 0.5-2 parts of ammonium pentaborate, 0.5-1 parts of p-nitrobenzyl alcohol, and 0.2-2 parts of glyoxal trimer dihydrate.

[0020] In some embodiments of the present invention, a method for preparing the above-mentioned aluminum electrolytic capacitor driving electrolyte comprises the following steps: (1) Take ethylene glycol, butyl suberic acid, ammonium sebacate, ammonium pentaborate, p-nitrobenzyl alcohol and glyoxal trimer dihydrate in proportion; (2) Ethylene glycol, butyl suberic acid, ammonium sebacate, ammonium pentaborate, p-nitrobenzyl alcohol and glyoxal trimer dihydrate are uniformly mixed to obtain an electrolyte.

[0021] In some embodiments of the present invention, in step (2), ethylene glycol, butyl suberic acid, ammonium sebacate, ammonium pentaborate, p-nitrobenzyl alcohol and glyoxal trimer dihydrate are mixed and stirred uniformly at a temperature of 85-95° C. to obtain an electrolyte.

[0022] Example 1 In this embodiment, an electrolyte for driving an aluminum electrolytic capacitor includes the following raw materials in parts by weight: 88.3 parts of ethylene glycol, 4 parts of butyl suberic acid, 6 parts of ammonium sebacate, 1 part of ammonium pentaborate, 0.5 parts of p-nitrobenzyl alcohol, and 0.2 parts of glyoxal trimer dihydrate.

[0023] This embodiment also provides a method for preparing the above electrolyte, comprising the following steps: (1) Take ethylene glycol, butyl suberic acid, ammonium sebacate, ammonium pentaborate, p-nitrobenzyl alcohol and glyoxal trimer dihydrate in proportion; (2) Ethylene glycol, butyl suberic acid, ammonium sebacate, ammonium pentaborate, p-nitrobenzyl alcohol and glyoxal trimer dihydrate are mixed and stirred at 90° C. to obtain an electrolyte.

[0024] Example 2 In this embodiment, an electrolyte for driving an aluminum electrolytic capacitor includes the following raw materials in parts by weight: 88 parts of ethylene glycol, 4 parts of butyl suberic acid, 6 parts of ammonium sebacate, 1 part of ammonium pentaborate, 0.5 parts of p-nitrobenzyl alcohol, and 0.5 parts of glyoxal trimer dihydrate.

[0025] This embodiment also provides a method for preparing the above electrolyte, comprising the following steps: (1) Take ethylene glycol, butyl suberic acid, ammonium sebacate, ammonium pentaborate, p-nitrobenzyl alcohol and glyoxal trimer dihydrate in proportion; (2) Ethylene glycol, butyl suberic acid, ammonium sebacate, ammonium pentaborate, p-nitrobenzyl alcohol and glyoxal trimer dihydrate are mixed and stirred at 85° C. to obtain an electrolyte.

[0026] Example 3 In this embodiment, an electrolyte for driving an aluminum electrolytic capacitor includes the following raw materials in parts by weight: 87.5 parts of ethylene glycol, 4 parts of butyl suberic acid, 6 parts of ammonium sebacate, 1 part of ammonium pentaborate, 0.5 parts of p-nitrobenzyl alcohol, and 1 part of glyoxal trimer dihydrate.

[0027] This embodiment also provides a method for preparing the above electrolyte, comprising the following steps: (1) Take ethylene glycol, butyl suberic acid, ammonium sebacate, ammonium pentaborate, p-nitrobenzyl alcohol and glyoxal trimer dihydrate in proportion; (2) Ethylene glycol, butyl suberic acid, ammonium sebacate, ammonium pentaborate, p-nitrobenzyl alcohol and glyoxal trimer dihydrate are mixed and stirred at 90° C. to obtain an electrolyte.

[0028] This embodiment 4 In the embodiment, an electrolyte for driving an aluminum electrolytic capacitor includes the following raw materials in parts by weight: 86.5 parts of ethylene glycol, 4 parts of butyl suberic acid, 6 parts of ammonium sebacate, 1 part of ammonium pentaborate, 0.5 parts of p-nitrobenzyl alcohol, and 2 parts of glyoxal trimer dihydrate.

[0029] This embodiment also provides a method for preparing the above electrolyte, comprising the following steps: (1) Take ethylene glycol, butyl suberic acid, ammonium sebacate, ammonium pentaborate, p-nitrobenzyl alcohol and glyoxal trimer dihydrate in proportion; (2) Ethylene glycol, butyl suberic acid, ammonium sebacate, ammonium pentaborate, p-nitrobenzyl alcohol and glyoxal trimer dihydrate are mixed and stirred uniformly at a temperature of 85-95° C. to obtain an electrolyte.

[0030] Comparative Example 1 In this comparative example, an electrolyte for driving an aluminum electrolytic capacitor includes the following raw materials in parts by weight: 87.5 parts of ethylene glycol, 4 parts of butyl suberic acid, 6 parts of ammonium sebacate, 1 part of ammonium pentaborate, 0.5 parts of p-nitrobenzyl alcohol, and 1 part of PVA. PVA is PVA1799.

[0031] This comparative example also provides a method for preparing the above electrolyte, comprising the following steps: (1) Take ethylene glycol, butyl suberic acid, ammonium sebacate, ammonium pentaborate, p-nitrobenzyl alcohol and PVA in proportion; (2) Ethylene glycol, butyl suberic acid, ammonium sebacate, ammonium pentaborate, p-nitrobenzyl alcohol and PVA are mixed and stirred at 90° C. to obtain an electrolyte.

[0032] Comparative Example 2 In this comparative example, an electrolyte for driving an aluminum electrolytic capacitor includes the following raw materials in parts by weight: 87.5 parts of ethylene glycol, 4 parts of butyl suberic acid, 6 parts of ammonium sebacate, 1 part of ammonium pentaborate, 0.5 parts of p-nitrobenzyl alcohol, and 1 part of PEG. PEG2000 is used.

[0033] This comparative example also provides a method for preparing the above electrolyte, comprising the following steps: (1) Take ethylene glycol, butyl suberic acid, ammonium sebacate, ammonium pentaborate, p-nitrobenzyl alcohol and PEG in proportion; (2) Ethylene glycol, butyl suberic acid, ammonium sebacate, ammonium pentaborate, p-nitrobenzyl alcohol and PEG are mixed and stirred at 90° C. to obtain an electrolyte.

[0034] The mass percentage comparison of each raw material in the electrolyte of Examples 1-4 and Comparative Examples 1-2 is shown in Table 1 below:

[0035] The conductivity and flash voltage in the electrolyte of Examples 1-4 and Comparative Examples 1-2 are shown in Table 2 below:

[0036] The test conditions for conductivity are: using DDSJ-308A conductivity meter, the test temperature is 30℃. The test conditions for flash voltage are: using high-purity electronic light foil, constant current 2mA / cm 2 , tested at 85℃.

[0037] As can be seen from Table 2, the electrolytes of Examples 1-4 are helpful to improve the flash voltage of the electrolytes and have little effect on the decrease of conductivity by adding different amounts of tri-glyoxal hydrate and other raw materials. Compared with Example 3, Comparative Examples 1 and 2 respectively add equal amounts of PVA and PEG2000 to replace tri-glyoxal hydrate. It can be seen that the electrolyte of Example 1 not only has a significantly higher flash voltage than Comparative Examples 1-2, but also has better conductivity than Comparative Examples 1-2.

[0038] The electrolytes of Examples 1-4 and Comparative Examples 1-2 were respectively applied to aluminum electrolytic capacitors, with the capacitor specifications being 6.8μF / 400V-8*14, positive foil-530VF, negative foil-3VF, and 125°C high temperature load, and the performance of the capacitors was measured with reference to GB / T 5993-2003. The test data are shown in Table 3 below:

[0039] Among them: the capacity difference Δ(ΔC / C0) before and after the test and the loss tangent value (DF) are used to represent the service life of the electrolytic capacitor, ΔC / C0 = (capacitance after the test - capacitance before the test) / capacitance before the test, the smaller the ΔC / C0, the smaller the capacity attenuation; DF = ESR × W × C, where ESR is the equivalent series resistance, W = 2πf, f is the frequency of the AC power supply, C is the capacitance, the smaller the loss tangent value, the smaller the capacitor heats up. The qualified judgment criteria are: ΔC / C < ± 20%, DF < 12%, LC (leakage current) < 250μA, appearance: no abnormality. The test conditions are: normal charging: cold charging, 425V, 4 hours; hot charging, 415V, 4 hours. The above test is the average value of 10PCS data load and the storage is the average value of 10PCS.

[0040] It can be seen from Table 3 that the aluminum electrolytic capacitors prepared by the electrolytes of Examples 1-4 of the present invention have less capacity decay and longer service life. Compared with Example 3, Comparative Examples 1 and 2 respectively add equal amounts of PVA and PEG to replace tri-glyoxal hydrate. It can be seen that the capacitor electrolyte of Example 3 has less capacity decay at 500h, 1000h and 2000h, longer service life and good thermal stability.

[0041] The above specific embodiments are further explanations of the technical solutions and beneficial effects of the present invention, and are not limitations of the implementation methods. For those skilled in the art, any obvious replacements that do not depart from the concept of the present invention are within the protection scope of the present invention.

Claims

1. An electrolyte for driving an aluminum electrolytic capacitor, characterized in that: The invention comprises the following raw materials in parts by weight: 80-90 parts of ethylene glycol, 3-5 parts of butyl suberic acid, 5-7 parts of ammonium sebacate, 0.5-2 parts of ammonium pentaborate, 0.1-1.5 parts of p-nitrobenzyl alcohol and 0.2-3 parts of glyoxal trimer dihydrate.

2. The aluminum electrolytic capacitor driving electrolyte according to claim 1, characterized in that: The invention comprises the following raw materials in parts by weight: 86.5-88.3 parts of ethylene glycol, 3-5 parts of butyl suberic acid, 5-7 parts of ammonium sebacate, 0.5-2 parts of ammonium pentaborate, 0.5-1 parts of p-nitrobenzyl alcohol and 0.2-2 parts of glyoxal trimer dihydrate.

3. The aluminum electrolytic capacitor driving electrolyte according to claim 1, characterized in that: The invention comprises the following raw materials in parts by weight: 88.3 parts of ethylene glycol, 4 parts of butyl suberic acid, 6 parts of ammonium sebacate, 1 part of ammonium pentaborate, 0.5 parts of p-nitrobenzyl alcohol and 0.2 parts of glyoxal trimer dihydrate.

4. The aluminum electrolytic capacitor driving electrolyte according to claim 1, characterized in that: The invention comprises the following raw materials in parts by weight: 88 parts of ethylene glycol, 4 parts of butyl suberic acid, 6 parts of ammonium sebacate, 1 part of ammonium pentaborate, 0.5 parts of p-nitrobenzyl alcohol and 0.5 parts of glyoxal trimer dihydrate.

5. The aluminum electrolytic capacitor driving electrolyte according to claim 1, characterized in that: The invention comprises the following raw materials in parts by weight: 87.5 parts of ethylene glycol, 4 parts of butyl suberic acid, 6 parts of ammonium sebacate, 1 part of ammonium pentaborate, 0.5 parts of p-nitrobenzyl alcohol and 1 part of glyoxal trimer dihydrate.

6. The aluminum electrolytic capacitor driving electrolyte according to claim 1, characterized in that: The invention comprises the following raw materials in parts by weight: 86.5 parts of ethylene glycol, 4 parts of butyl suberic acid, 6 parts of ammonium sebacate, 1 part of ammonium pentaborate, 0.5 parts of p-nitrobenzyl alcohol and 2 parts of glyoxal trimer dihydrate.

7. A method for preparing an electrolyte for driving an aluminum electrolytic capacitor according to any one of claims 1 to 6, characterized in that: The method comprises the following steps: (1) taking ethylene glycol, butyl suberic acid, ammonium sebacate, ammonium pentaborate, p-nitrobenzyl alcohol and glyoxal trimer dihydrate in proportion; and (2) mixing ethylene glycol, butyl suberic acid, ammonium sebacate, ammonium pentaborate, p-nitrobenzyl alcohol and glyoxal trimer dihydrate evenly to obtain an electrolyte.

8. The method for preparing an electrolyte for driving an aluminum electrolytic capacitor according to claim 7, characterized in that: In the step (2), ethylene glycol, butyl suberic acid, ammonium sebacate, ammonium pentaborate, p-nitrobenzyl alcohol and glyoxal trimer dihydrate are mixed and stirred uniformly at a temperature of 85-95° C. to obtain an electrolyte.

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