Electrolytic capacitor paper with high tensile strength and low tightness as well as preparation method and application of electrolytic capacitor paper

Abstract

The invention belongs to the field of electrolytic capacitor paper, and particularly relates to high-tensile-strength low-tightness electrolytic capacitor paper and a preparation method and application thereof. The invention relates to electrolytic capacitor paper with high tensile strength and low tightness, the tightness of the electrolytic capacitor paper is 0.20-0.40 g / cm < 3 >, and the electrolytic capacitor paper is prepared from the following components in percentage by dry weight: 80%-90% of sisal pulp and 10%-20% of skin-core polyester staple fiber; the skin layer of the skin-core polyester staple fiber adopts low-melting-point polyester, the hot melting temperature is 100-150 DEG C, the skin layer accounts for 10-20% of the total mass, the core layer adopts conventional polyester, and the hot melting temperature is 240-270 DEG C; the beating degree of the sisal hemp pulp is 15-25 DEG SR, the sisal hemp pulp and the skin-core polyester staple fibers are uniformly mixed and then are fed into a paper machine drifting system, wet-process papermaking forming and paper machine setting drying are performed, the drying temperature is the low-melting-point polyester hot melting temperature minus 180 DEG C, and the electrolytic capacitor paper with high tensile strength and low tightness is obtained.

Description

technical field [0001] The invention belongs to the field of electrolytic capacitor paper, and in particular relates to a low-tightness electrolytic capacitor paper with high tensile strength and a preparation method and application thereof. Background technique [0002] The development of electrolytic capacitors requires electrolytic capacitor paper, one of its important constituent materials, to develop in the direction of low tightness and low loss. Therefore, low tightness electrolytic capacitor paper is the future development trend, but because the fibers used in the production process have not undergone beating treatment or The degree of beating treatment is low, so the tensile strength of the product is low. One of the development directions of electrolytic capacitor paper is miniaturization, which requires a very narrow cutting width of electrolytic capacitor paper. After the width of electrolytic capacitor paper is narrowed, it will cause paper breakage in the produ...

AI Technical Summary

Problems solved by technology

One of the development directions of electrolytic capacitor paper is miniaturization, which requires the cutting width of electrolytic capacitor paper to be very narrow. After the electrolytic capacitor paper is cut narrow, it will cause paper breaks in the production process of electrolytic capacitors, which greatly affects electrolytic capacitors. production efficiency, even difficult to adapt to the high-speed process requirements of electrolytic capacitors

The traditional papermaking process generally enhances the tensile strength between fibers by coating or adding reinforcing agents in the pulp, but both methods have serious drawbacks, which restrict the development of this method in the electrolytic capacitor paper industry.

[0003] For example, the Chinese invention patent CN201811056101.5 applied by the applicant discloses a coating-enhanced carbonization-free solid electrolytic capacitor paper and its preparation method. The surface of the electrolytic capacitor paper is coated by surface spraying or dipping, and the coating amount accounts for the total amount of the paper. 1-10% of the absolute dry weight to further enhance the strength of the paper, but there are certain disadvantages in the use of coating to enhance the strength of the paper. First of all, because the production process of the reinforcing agent used mostly requires halogen elements as inducers, so the strengthening agent The remaining halogen elements are relatively more, and the halogen elements have a strong corrosion effect on the dielectric layer (AL2O3) of the electrolytic capacitor, which will cause it to lose its dielectric effect, thereby causing the electrolytic capacitor to fail

Second, the strengthening agent is added by coating. Since the strengthening agent uses water as a solvent and generally has a relatively low concentration, and the low-density electrolytic capacitor pulp has a low degree of treatment, the initial tensile strength is very low. The agent, water and solvent will break, and the coating cannot be completed

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