JPS58145060A - Grease for storage battery - Google Patents

Abstract

PURPOSE:Grease for a storage battery whereby an electrode pole and its external terminal or the like can be protected from corrosion due to an electrolyte by mixing fluorin resin with a main material of oil-state fluorid. CONSTITUTION:Storage battery grease modified by mixing about 65-75pts.wt. oil-state fluorid of low polymer ethylene fluorid or the like as lubricating oil of a main material and about 35-25pts.wt. fluorin resin of polytetrafluoroethylene or the like as a density increasing agent. Or storage battery grease further added with a small amount of plural cyclic compounds of nitrogen contained with a fluorin atom, for instance, compound of perfluoroalkyl. By grease of this composition, corrosion of an electrode pole is prevented, and a battery can be maintained in a good stable condition throughout a long period. Further existence of additives can maintain rustproof of a sealed part.

Description

[Detailed Description of the Invention] The cathode and anode poles of a conventional storage battery, such as a lead-acid battery, are inserted from inside the battery container into a ship bushing buried in the container wall, and the outer layer of the pole pole insertion part is made air-liquid-tight by applying molten lead to the outer end. (An air-liquid sealing device for a pole pole terminal in which a terminal is sealed, or a rubber plasticine is fitted to the outer periphery of the terminal at the insertion part, and the outer periphery is sealed air-liquid-tight with a screw that is screwed into this J. However, during use, the electrolyte that adheres to the pole poles and lead bushings causes corrosion, and the progress of corrosion increases, especially at the insertion part of the anode pole, and the electrolyte leaks to the outside, resulting in so-called end corrosion. A black phenomenon occurs, and the corroded portion often bulges out in the form of a lump, causing problems such as destroying the outer battery case or lid.

The present invention eliminates these inconveniences and provides a grease that protects the pole poles of storage batteries, their external terminals, lead bushings, etc. from corrosion caused by electrolyte, and which is mainly composed of oily fluoride. It is made by mixing fluororesin with this.

Furthermore, the present invention provides, as the above-mentioned grease of the present invention, a grease that has excellent rust prevention properties especially at high temperatures. It is made by mixing with a heterocyclic compound.

Next, examples of the present invention will be described.

In general, grease is a solid substance made by uniformly dispersing a thickening agent in lubricating oil, and according to the present invention, both of these are combined with fluorine, which is highly chemically inert and has excellent thermal stability. It is characterized by using a compound.

That is, as the lubricating oil, an oily fluoride is used, such as low polymerized fluorinated ethylene, fluorinated ethylene chloride, fluoroalkyl, perfluoroalkyl, perfluoroalkylene, perfluoroalkyl ether, perfluoroalkylene ether, etc., which is usually fluorinated oil. Preferably, the one called More specifically, for example, triseptinate salt is preferable. Perfluoroalkyl ethers have particularly good coexistence with plastics.

As the kite for increasing age, a fluororesin is used, such as polytetrafluoroethylene (PTFE), fluorinated ethylene-propylene copolymer, or the like.

FTPK has a molecular weight of 2,000 to 50,000 degrees, preferably 10,000 to 50,000, and a concentration of 2.2 to 2.
3q/cc, particle size 1.0-2.0 μm2 surface area 7.6 moromi/liter, and molecular weight 120 mouths as FlitP.

~190000 preferably 140000~160000
with a concentration of 2.4 to 2.5 g/cY7. Particle 0.
Used with a surface area of 0.005 to 1.0 μm9 and a surface area of 10*7 g.

In mixing fluorine oil and fluororesin, the mixing ratio is preferably 65 to 75 parts by weight of fluorine oil and 35 to 25 parts by weight of fluororesin. In this mixing, since both are heptides, they have good affinity and coexistence, and a good grease with stable and uniform lubricity and viscosity can be obtained.

The grease obtained in this way is chemically stable to about 0% and has an extremely high ability to repel electrolyte, and when applied to the surfaces of poles, lead bushings, etc., it imparts rust prevention properties. Moreover, it has an extremely excellent ability to actively protect the surface from the intrusion of electrolyte. In addition, in order to maintain air-liquid tightness, good air-liquid tightness can be ensured by, for example, applying a sealant to the annular gap between the pole column and the hole wall on its outer periphery, or applying it to the rubber backing. . In this case, fluorine compounds not only have particularly excellent chemical stability and thermal stability, but also have a higher surface tension than other greases, so they are effective against crevice corrosion, which is thought to be the cause of abnormal anode corrosion. , the effect of preventing the electrolyte from seeping out brings about a significant advantage.

Further, according to the present invention, by adding and mixing a fluorine atom-containing nitrogen heterocyclic compound as an additive to the above-mentioned grease, a grease with high rust prevention properties can be obtained, especially at high temperatures and under pressure. I found out that. Its general formula is: X is 0 or S Rf is perfluoroalkyl, perfluoroalkyl ether.

, bellfluoroallyl, bellfluoroalkylene, or bellfluoroalkylene ether, but especially when the heterocyclic compound is benzothiazole and benzoxyazole, compounds obtained by combining this with the above Rf as described above are excellent. . It is sufficient if this additive is added in an amount of 1% by weight or less, and the composition of the grease is, for example, 65 to 72% by weight of fluorine fFJJ, 27 to 64% of a thickener, and 1% of an additive. In this case, since the additive is also a fluoride, a uniform grease with good overall mixability can be obtained.

Next, the results of a comparative test on rust prevention are shown. The test used an electrolytic solution with a specific gravity of 1,300 or more, which is higher than the concentration of normal sulfuric acid.

The above two types of grease of the present invention, conventional grease, and vaseline were applied to a lead alloy, and the corrosion state was observed by changing the temperature or applying pressure. The results are shown in Table 1 below. Judgment: Grease? It was removed and the state of corrosion was observed with the naked eye and with a microscope.

Table 1 ◎: Particularly stable, O: Stable 1 mouth: Almost stable △: Almost corroded. ×: Corrosion As described above, according to the present invention, since the grease is mainly made of oily fluoride and mixed with fluororesin,
It prevents corrosion of pole columns and maintains a stable and good battery over a long period of time.Furthermore, when a nitrogen heterocyclic compound containing fluorine atoms is used as an additive, it prevents corrosion of sealing parts that are exposed to high temperatures and pressure. It has the effect of maintaining sex.

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Claims (1)

[Claims] 1. Grease for storage batteries, which is mainly composed of oily fluoride and mixed with fluororesin. 2 65-75 parts by weight of oily heptadide and 35-75 parts by weight of fluororesin
25 parts by weight of the storage battery grease according to claim (1). (5) Grease for storage batteries, which is mainly composed of oily fluoride and mixed with a fluororesin and a nitrogen heterocyclic compound containing a small amount of fluorine atoms. 4. Nitrogen heterocyclic compounds containing fluorine atoms are:
The grease for storage batteries according to claim (3), which is a compound with perfluoroalkyl, perfluoroalkyl ether, perfluoroalkylene perfluoroalkylene ether, benzothiazole or benzoxyazole.