Advantages and development trend of the hottest lo

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With the development of science and technology, especially the development of integrated circuits (IC) and very large scale integrated circuits (VLSI), whether the whole capacitor industry can develop continuously or even survive has attracted people's attention. However, since 1987, the global capacitor production has increased at a rate of more than 20% every year, which makes this doubt irrefutable. Practice has proved that electrolytic capacitors have strong vitality and irreplaceable

? On the one hand, due to the emergence of IC, some small capacity capacitors are integrated into the circuit; On the other hand, the development of IC has greatly increased the working frequency of the circuit system, resulting in electrolytic capacitors being replaced by other capacitors in some circuits. However, the power part of IC circuit is always inseparable from electrolytic capacitors

 in addition, the improvement of the performance of electrolytic capacitors has also expanded to the application fields of other capacitors

It can be seen that aluminum electrolytic capacitors are not impacted by other capacitors, and have unique advantages such as large unit volume capacity, large electrostatic capacity, high specific capacity, easy miniaturization, self-healing characteristics, low price, etc. In addition, although there is some competition in low-voltage and small capacity, the way out is to speed up the research and development of related technologies, strengthen and continue to expand the existing advantages of electrolytic capacitors. They are no longer simple ordinary bottles, films, tires and so on to overcome their own shortcomings. Especially in recent years, electrolytic capacitors have made great breakthroughs in many aspects and achieved a qualitative leap. Not only does its market share not shrink, on the contrary, its application field continues to expand, showing high-speed growth, ushering in many unprecedented development opportunities. As one of its three major raw materials, electrolytic capacitor paper has irreplaceable advantages, such as mature products, low manufacturing costs, environmental protection, degradability, good absorption, high temperature resistance, etc., because some electrolytic capacitor paper is also irreplaceable

"development trend of low voltage electrolytic capacitor paper

" 1. Low loss

"for electrolytic capacitors, the loss value depends on the inherent dielectric loss of electrode foil and the equivalent series resistance of electrolyte. When the inherent dielectric loss of electrode foil is certain, the main measure to reduce the loss is to improve the absorption of electrolytic capacitor paper. In order to improve the absorption of low-pressure electrolytic paper, most manufacturers use fibers with low loss values such as s, m, C, B and E as raw materials of low-pressure electrolytic paper, and reduce the density of low-pressure electrolytic paper on the premise of ensuring tensile strength. At present, the density of mer0.5, mr5d0.5 and other products of NKK company has reached 0.35g/cm3. In terms of production technology, in order to meet the rapidly growing passenger transport demand, the S2 series products of Kan company for the first time adopt the fiber horizontal arrangement technology, which improves the horizontal absorption of paper by increasing the longitudinal capillary absorption of fibers. In terms of product structure, most manufacturers adopt double-layer composite or even multi-layer composite structure to reduce the loss value of low-voltage electrolytic paper. For example, mr5d series of NKK company in Japan, S2, SM2 and WB2 series of Kan company in China all adopt double-layer composite structure, and SMS series of Kan company in China also adopts three-layer composite structure

 2. High purity

 large leakage current is the performance disadvantage of electrolytic capacitors. Low voltage electrolytic capacitors require high accuracy, so there are special requirements for leakage current. For example, coupling capacitors in high gain preamplifier stage require no leakage current to ensure the quality of high fidelity stereo equipment, so reducing leakage current has become an important topic to meet this requirement. The purity of electrolytic paper as the raw material of electrolytic capacitor is the key factor affecting the leakage current. At present, the purity indicators of IEC and national standards are different, but they are far lower than the current actual level of electrolytic capacitor paper. For example, the Japanese national standard stipulates that 0.1 ~ 1mm2 ≤ 5/1800cm2, but now both NKK company in Japan and Ka company n in China explore the path of industrialization of R & D achievements, which stipulates that 0.1mm2 is not allowed, 0.08 ~ 0.1mm2 ≤ 5/1800cm2

, The performance of paper is to have good absorption (low density); On the other hand, in order to meet the requirements of miniaturization of capacitors, the electrolytic paper will be thinner and thinner, but too low density or too thin thickness will affect the strength of electrolytic paper. Therefore, on the premise of low loss and miniaturization of capacitors, improving the strength of low-voltage electrolytic capacitor paper will be a development direction of low-voltage electrolytic capacitor paper in the future

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