JPS62157672A - Liquid port stopper for lead storage battery - Google Patents

Abstract

PURPOSE:To stably maintain high water repellency for long term, by dispersively adhering polytetrafluoroethylene and silicon to porous filter made of ceramics in uniform. CONSTITUTION:A porous filter made of ceramics 1 is dipped in an alcohol solution, where powders of polytetrafluoroethylene 4 are dispersed, and dried. Thereafter, the powders of polytetrafluoroethylene 4 adhered in an inert gas such as nitrogen or argon are adhered onto the surface of ceramics particles 2 with their sintering being done. Next, the filter 1 is dipped in the solution where silicons 5 are added to solvent such as thinner and the solvent is vaporized. then, a sintering process is performed for adhering the silicons 5 to the ceramics particles 2.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a liquid outlet plug for a lead-acid battery.

(Prior art) In the past, various liquid port plugs with various structures have been invented and put into practical use as liquid port plugs for lead-acid batteries for vibration-resistant liquid, but a ceramic porous filter has been developed as the most excellent liquid port plug. This method was used to create a splash-proof structure. FIGS. 4 and 5 show the state of adhesion of water repellent to a conventional ceramic porous filter. FIG. 4 shows the case where only silicon is attached, and FIG. 5 shows the case where tetrafluoroethylene is attached. In the figure, 11 is a ceramic particle, 12 is a porous part, 13 is silicon, and 14 is tetrafluoroethylene. In both cases, silicon 13 and tetrafluoroethylene 14 are bonded to ceramic particles 11
It adheres only to the surface and is not evenly adhered.

If only a ceramic porous filter is used, liquid will enter the porous body, reducing the splash-proof effect and therefore the liquid overflow performance. Therefore, a water repellent treatment is applied to prevent liquid from entering the porous part of the ceramic porous body. Silicone is generally used for this water-repellent treatment, as it repels liquid so as not to reduce the splash-proofing effect. However, although silicon has good water-repellent ability as a water-repellent treatment agent, it is weak against dilute sulfuric acid used in electrolytes, and its bond with ceramic particles is weak over time. When tetrafluoroethylene is used as a treatment agent, it is resistant to changes over time, but has the disadvantage of low water repellency.

(Problem to be Solved by the Invention) When liquid adheres to the ceramic porous filter, the porous portion causes a capillary phenomenon, and the liquid is absorbed by the ceramic porous filter. Therefore, when pressure or vibration is applied, this The hot liquid flows outside the liquid port plug, that is, outside the battery. To prevent this from happening, water repellent agents were used. This water repellent treatment agent used silicon or tetrafluoroethylene. Silicon has good dispersibility and high water-repellent ability, so it penetrates into the pores of the ceramic porous filter and has a high overall water-repellent ability. Tetrafluoroethylene has the disadvantage of being weak and weak against changes over time.Although tetrafluoroethylene is strong against changes over time and against acids such as dilute sulfuric acid, it has poor dispersibility and when attached to a filter, as shown in Figure 5. The problem was that it only stuck to targets.

The purpose of the present invention is to eliminate the conventional drawbacks and combine the features of both of the above-mentioned water repellents, that is, to provide a liquid spout for lead-acid batteries that stably maintains high water repellency over a long period of time. That's true.

(Means for Solving the Problems) The liquid spout plug for lead-acid batteries of the present invention is produced by impregnating tetrafluoroethylene into a ceramic porous filter, covering the surface of ceramic particles, and then sintering and adhering the filter. It incorporates a ceramic porous filter that is later impregnated with silicon and sintered and adhered to the upper surface on which ceramic particles or tetrafluoroethylene are adhered.

Further, the tetrafluoroethylene attached to the ceramic porous filter is sintered at 300°C to 350°C in an inert gas, and the silicon is sintered at 200°C to 250°C.

Furthermore, when attaching tetrafluoroethylene to a ceramic porous filter, the tetrafluoroethylene is dissolved in an aqueous alcohol solution and immersed in the solution, and silicon is dissolved in a solvent such as thinner and then immersed in the solution.

(Function) With the above-described structure, the present invention provides a liquid port plug with excellent liquid overflow resistance. In other words, tetrafluoroethylene is uniformly dispersed and adhered to the ceramic porous filter, and silicon is dispersed in the filter. By adhering them, the advantages of both can be effectively utilized and high water repellency can be obtained for a long period of time. In other words, since tetrafluoroethylene has a low dispersion ability, it does not penetrate into the pores of the ceramic porous filter, and only partially adheres to it, so the area where the tetrafluoroethylene is attached has a high water repellency, but it does not penetrate into the pores of the ceramic porous filter. Where there is no water repellency, the water repellency is low, which means that the water repellency is low overall.

Furthermore, sufficient strength cannot be obtained when bonding with ceramics unless a proper sintering method is used. In other words, high water repellency and long-term stability can be achieved through uniform dispersion and adhesion and an appropriate sintering method. By adding the high water repellency of silicon to this, a ceramic porous filter with extremely high water repellency can be obtained.

(Example) An example of the present invention will be described based on FIGS. 1 to 3.

FIG. 1 is a cross-sectional view of a ceramic porous filter subjected to water-repellent treatment according to the present invention, and FIG. 2 is a partially enlarged cross-sectional view of FIG. 1. In the figure, 1 is a ceramic porous filter, 2 is a ceramic particle, and 3 is a porous part (space part) opened between the ceramic particles. First, using a ceramic porous filter 1, tetrafluoroethylene 4 is dissolved in an alcohol aqueous solution, and then the ceramic porous filter 1 is immersed in this solution and dried to remove water, and an inert gas, such as nitrogen or argon, is used. The tetrafluoroethylene 4 deposited in the ceramic particles 2 is sintered and deposited on the surface of the ceramic particles 2. The sintering temperature at this time is 300℃ to 350℃
It is ℃. In this way, the tetrafluoroethylene 4 is uniformly dispersed and firmly adhered, resulting in excellent adhesion. Next, silicon 5 is deposited. silicon 5
After dissolving it in a solvent such as thinner, ethylene tetrafluoride 4
The ceramic porous filter 1 which has been sintered is immersed, silicone 5 is attached, the solvent is blown off, and then the filter is heated at 200°C to 250°C.
It is sintered at ℃ and silicon 5 is attached. The ceramic porous filter made in this way contains 4 ethylene tetrafluoride.
and silicone 5 enter the pores of the filter sufficiently uniformly,
It covers individual ceramic particles to make them water repellent, and combines the long-term stability of tetrafluoroethylene 4 with silicon 5.
It also has high water repellency. Next, as shown in FIG.
, and the splash-proof plate 7 is inserted and attached under it.

A gasket 8 is attached to this liquid spout plug to form a liquid spout plug. 9 is an exhaust hole opened in the upper part of the liquid port body 6;
0 is an exhaust port opened on the side surface of the liquid port plug main body 6. Reference numeral 6' designates a threaded portion of the liquid spout body 6 for attachment to the liquid spout provided on the lid of the storage battery. In this way, the liquid spout of the present invention is produced.

(Effects of the Invention) According to the present invention, extremely high water repellency, which could not be obtained with conventional water repellents, can be maintained for a long period of time.
In practical terms, the effect is extremely large.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a ceramic porous filter according to an embodiment of the present invention, Fig. 2 is an enlarged sectional view of the same portion, Fig. 3 is a sectional view of a liquid port plug of the invention, and Figs. FIG. 2 is a partial cross-sectional view of a conventional ceramic porous filter. 1... Ceramic porous filter, 2... Ceramic particles, 3... Porous portion, 4... Tetrafluoroethylene, 5... Silicon, 6... Liquid spout body, 6'...・Screw part. 7... Splashproof plate, 8... Packing, 9... Exhaust hole, 10... Exhaust port. Patent applicant: Matsushita Electric Industrial Co., Ltd. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (3)

[Claims] (1) Permeate tetrafluoroethylene into a ceramic porous filter, cover the surface of the ceramic particles, and then sinter and adhere it. Further, permeate silicon and sinter and adhere to the ceramic particles or the top surface on which the tetrafluoroethylene is attached. A liquid spout plug for a lead-acid battery, characterized in that it has a built-in ceramic porous filter. (2) Sintering the tetrafluoroethylene attached to the ceramic porous filter at 300°C to 350°C in an inert gas,
The liquid spout plug for a lead-acid battery according to claim (1), wherein the silicon is sintered at 200°C to 250°C. (3) A patent characterized in that when attaching tetrafluoroethylene to a ceramic porous filter, the tetrafluoroethylene is dissolved in an aqueous alcohol solution and immersed in the adhesion, and the silicone is dissolved in a solvent such as thinner and attached by immersion. A liquid spout plug for a lead-acid battery according to claims (1) and (2).