JPS5819852A - Alkaline storage battery - Google Patents

Abstract

PURPOSE:To prevent leakage of an electrolyte and improve preservation performance by dispersing a filler with the specific particle diameter in the low molecular weight polyamideamine as a sealing compound between a negative electrode sealing plate and an insulating packing. CONSTITUTION:This alkaline storae battery disperses and inserts fine powder fillers of 0.1mu or less such as silicon oxide, titanium oxide, silicon nitride, and alumina, in the low molecular weight polyamideamine with the amine value of 80-400 and the number mean molecular weight of 10,000 or less as a sealing compound between a negative electrode sealing plate 1 and an insulating packing 2. As a result, the alkaline storage battery with excellent leakage characteristics can be obtained.

Description

[Detailed Description of the Invention] The present invention relates to alkaline batteries such as silver oxide batteries, mercury batteries, and alkaline manganese batteries, and provides alkaline batteries that prevent leakage of alkaline electrolyte and have good storage performance. It is.

Alkaline batteries generally have a sealing structure as shown in FIGS. 1 and 2, with an insulating backing 2 and a sealant 4 interposed between the cathode sealing plate 1 and the anode container 3. It is formed by sealing the upper side of the inner side K.

Polyamide, asphalt pitch, microcrystalline wax, fluororesin, silicone oil, etc. have been used as sealants, and have achieved some degree of effectiveness.

However, even with the use of these sealants, a fully satisfactory sealing effect could not be obtained. In particular, large distortions are formed in the sealing part during assembly, and due to this distortion, high temperatures and
There was a problem with leakage due to exposure to high humidity.

In order to solve the above conventional drawbacks, as a result of intensive research, we found that the number average molecular weight is 10,000 or less, more preferably 500.
It has been discovered that a sealant in which a filler having an average particle size of 0.1 μm or less is dispersed in polyamide amine having a particle size of 0.0 μm or less is more stable in terms of liquid resistance. Traditionally, by mixing fillers into polymers, thermal stability has been achieved,
Efforts have been made to improve the glass transition point, but as a sealant for alkaline batteries, the relaxation time for stress concentration during the sealing process is short, and the residual stress or yield value after the shape has stabilized may be low. It has been discovered that the three-vane thixotropic property of having 3-vane thixotropic properties is effective. In other words, silica is used as a filler.

Titanium oxide, silicon carbide, silicon nitride, and alumina fine particles are suitable, and particularly preferable results were obtained when the mixing amount thereof is 2 to 30 wt%.

Next, the present invention will be specifically explained using examples.

(Example 1) Silica powder (Asilosil) was added to fatty acid polyamide amine with a number average molecular weight of 1600 in terms of polystyrene.
Sixty alkaline batteries were experimentally produced using the wt % mixed and dispersed composition as a sealant.

(Example 2) Fifty alkaline batteries were prototyped using a composition prepared by mixing and dispersing 30 wt % of silica powder in the same fatty acid polyamide amine as in Example 1 as a sealant.

(Example 3) Sixty alkaline batteries were prototyped using a composition in which 35 wt % of silica powder was mixed and dispersed in the same fatty acid polyamide amine as in Example 1 as a sealant.

Next, we manufacture alkaline batteries using conventional encapsulants,
compared.

(Comparative Example 1) Fifty alkaline batteries were experimentally produced using the fatty acid polyamide amine used in Examples 1 and 2.3 as a sealant.

(Comparative Example 2) Sixty alkaline batteries using asphalt pitch as a sealant were manufactured.

Examples 1 to 3 and Comparative Examples 1 to 2 were prepared at a temperature of 60°C and a humidity of 9.
Table 1 shows the results of visually inspecting for liquid leakage after being allowed to stand for 1500 hours in an environment of zero temperature.

As is clear from the results in Table 1 above, low molecular weight (amine value 80-400', number average molecular weight 10oOo) is used as a sealant.
(below) polyamide amine, silicon oxide, titanium oxide,
Alkaline batteries in which fine powder of silicon carbide, silicon nitride, alumina, etc. of 0.1 μm or smaller are mixed and dispersed have excellent leakage resistance.

As described above, the present invention has great industrial value in that it has been able to provide an alkaline battery with less leakage.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional alkaline battery, and FIG. 2 is an enlarged view of the sealed portion of the battery. 1...Cathode sealing plate, 2...Insulation, 3...Anode container v4...Sealant. Name of agent: Patent attorney Medium Toshio Oo and 1 other person 1st
figure! Figure 2

Claims (2)

[Claims] (1) 'Polyamide amine is interposed between the cathode sealing plate and the insulating backing, and a filler with a particle size of 0.1 μ or less is dispersed in the polyamide amine.
Text≠English alkaline battery. (2) The number average molecular weight of the polyamide amine is 1000
2. The alkaline battery according to claim 1, wherein the value of 0 or less is equal to or less than 0.