Low closeness paper for electrolytic capacitor

An electrolytic capacitor and tightness technology, applied in the field of paper, can solve the problems of increasing the short-circuit rate of capacitors, the short-circuit rate of batteries, and being low, and achieve the effect of increasing capacity, low short-circuit rate, and low tightness.

Inactive Publication Date: 2008-03-05
ZHEJIANG KAN SPECIALITIES MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to achieve a certain strength, beating must be done, and the paper made of Spanish grass or Manila hemp fiber after beating cannot be lowered, generally above 0.35g / cm3, if it is lowered, the strength of the paper will be reduced. Not good, when winding, the paper will break more often, and the paper made of Spanish grass or Manila hemp is extremely intolerant to burrs when the tightness is as low as 0.40g / cm3, which will make the capacitor The short circuit rate rises sharply
Similarly, for battery separator paper, the low tightness of the paper is also very important. Low tightness can make the paper absorb better and make the battery capacity larger, but like electrolytic paper, the tightness of the paper will bring The strength of the incoming paper is not good, and the short circuit rate of the battery will increase

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1: Aramid staple fibers account for 20% of the total fiber amount, and biocellulose fibers account for 80% of the total fiber amount. Beat with a beater to mix the fibers well.

[0016] The fully mixed fibers are made into paper with a cylinder paper machine, dried in a drying cylinder at a temperature of about 106°C, and rolled up to obtain electrolytic paper. After measurement, the thickness of the paper is 40μm, the tightness is 0.310g / cm3, the tensile strength is 0.83kN / m, the water absorption height is 45mm / 10min in the longitudinal direction, 30mm / 10min in the transverse direction, the loss ratio is 0.599, and the breakdown voltage is 628V , The circuit short circuit rate is 0.05%.

Embodiment 2

[0017] Embodiment 2: Aramid staple fiber accounts for 45% of the total fiber amount, and biological cellulose fiber accounts for 55% of the total fiber amount. The pulp is beaten with a beater to fully mix the fibers.

[0018] The fully mixed fibers are made into paper with a cylinder paper machine, dried in a drying cylinder at a temperature of about 106°C, and rolled up to obtain electrolytic paper. After measurement, the thickness of the paper is 40μm, the tightness is 0.312g / cm3, the tensile strength is 0.82kN / m, the water absorption height is 45mm / 10min in the longitudinal direction, 30mm / 10min in the transverse direction, the loss ratio is 0.601, and the breakdown voltage is 625V , The circuit short circuit rate is 0.05%.

Embodiment 3

[0019] Example 3: Aramid staple fiber accounts for 65% of the total fiber amount, biocellulose fiber accounts for 30% of the total fiber amount, and Manila hemp accounts for 5%. Beat with a beater to mix the fibers well.

[0020] Then use a cylinder paper machine to make paper, dry it at a drying cylinder temperature of 106° C., and roll it to obtain electrolytic paper. After measurement, the thickness of the paper is 40μm, the tightness is 0.303g / cm3, the tensile strength is 0.78kN / m, the water absorption height is 41mm / 10min in the longitudinal direction, 28mm / 10min in the transverse direction, the loss ratio is 0.578, and the breakdown voltage is 653V , The circuit short circuit rate is 0.04%.

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Abstract

This invention provides a kind of paper with special use, especially in low-tightness electrolytic capacitor and diaphragm cells, which at least comprises two fibers: one is aromatic polyamide fiber, other is bio-cellulose fiber, the former used as frame of paper, weighing 20%-65% of amount, the latter filled among aromatic polyamide fibers, weighing 35%-80%. The invention has advantages of low-tightness, absorbent quality, and improves electric property of electrolytic capacitor and cells and increases service life.

Description

technical field [0001] The invention relates to special-purpose paper, in particular to a low-density electrolytic capacitor paper. Background technique [0002] Electrolytic capacitors or electrolytic cells are structurally sandwiched between two metal foils with a layer of paper or non-woven fabric, impregnated or dripped with electrolyte after winding, and then installed in the casing. For this type of electrolytic capacitor or battery, the characteristics of the paper wound in it have a great influence on the performance of the capacitor or battery, especially the impedance of the paper must be very low. To meet the above requirements, first, the tightness of the paper should be as tight as possible. The second is to choose fibers with good hygroscopicity and strong moisturizing properties, so that the paper can absorb as much electrolyte as possible, and the thickness of the paper should be as thin as possible. However, the strength of paper with low tightness, thin th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H13/26D21H17/54
Inventor 陈万平王白浪王贤炉
Owner ZHEJIANG KAN SPECIALITIES MATERIAL
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