JP2504317B2 - Manufacturing method of paste for lead acid battery plates - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for producing a lead storage battery electrode plate paste, and to improve the manufacturability and the paste filling property.

2. Description of the Related Art Conventional lead-acid battery electrode plate paste manufacturing methods generally use water and sulfuric acid having a relatively high specific gravity as median diameters.
Was kneaded with 1 to 2 μm of lead oxide to form a paste. The PbSO ₄ content of this paste is almost in the range of 2 to 25%, and the thixotropy is 11% or less.

Problems to be Solved by the Invention By kneading the paste with sulfuric acid having a relatively high specific gravity, it is necessary to make the kneading machine and the devices before and after it acid resistant, and not only the device itself becomes expensive but also the device maintenance becomes large. It also requires man-hours and costs.

However, if the amount of paste PbSO ₄ is decreased from the present level by lowering the sulfated weight or the amount of sulfuric acid, the paste viscosity will decrease and it will be difficult to fill the slurry area to prevent the paste from falling off. In order to achieve this, it is necessary to use a paper-attached electrode plate in which paper is attached to at least one surface of the electrode plate. In addition, other workability (handling property) deteriorates, and the amount of paste PbSO ₄ cannot be reduced from the present level.

Also, with the current amount of paste PbSO ₄ , the thixotropy is 11
% Or less, the paste may drip after filling the base with the paste.

Means for Solving the Problems The present invention is to solve the above problems, mainly using water as a medium for limiting the particle diameter of lead oxide as an active material raw material and forming a paste, and adding a small amount of sulfuric acid. Alternatively, it is not used at all, or a thickener is used.

First of all, it is not necessary to make the kneader and the equipment before and after it acid resistant by kneading without using low specific gravity sulfuric acid (PbSO ₄ content in the paste is 5% or less) or sulfuric acid, and the equipment itself is not only inexpensive but also maintenance. Less man-hours and costs will be saved.

Further, after the paste, the xotropic property becomes appropriate, and the defective rate of the electrode plate after filling is almost eliminated.

Furthermore, the lead storage battery using the above paste can have a higher capacity and a longer life.

Example An example of the present invention will be described.

Lead oxide and mainly water, or mainly water and thickener, or mainly water and low specific gravity sulfuric acid (Pb in paste
The amount of SO ₄ was 5% or less).

Table 1 shows three types of pastes of the present invention, two types of conventional pastes, types of mixtures, and paste characteristics.

The paste obtained by the present invention has a thixotropic coefficient of 12 to
18%. And as shown in FIG. 1, the thixotropy is
If it is 12 to 18%, the filling property is good, but if it is 11% or less, there is paste dripping, and if it is 19% or more, the paste is too viscous and the defective rate increases.

Next, FIG. 2 shows the thixotropy of the lead oxide of the present invention and the conventional lead oxide with respect to the amount of PbSO ₄ .

According to FIG. 2, the conventional lead oxide A does not exceed 12% in any amount of PbSO ₄ , but the lead oxide B of the present invention has a thixotropic coefficient of 5% or less in PbSO _4. 1
It becomes 2-18%.

Further, FIG. 3 shows the relationship between the thixotropy and the median diameter of the particle diameter of lead oxide when the amount of PbSO ₄ is 0%. As shown in FIG. 3, when the thickness is 0.5 μm or less, the thixotropy is 12 to 18%, which is in a good range, but when it is more than 0.5 μm, the thixotropy is 11% or less and the paste properties are poor.

Effects of the Invention As described above, according to the present invention, the manufacturing process of the lead storage battery electrode plate paste can be simplified and the manufacturability is improved. Moreover, the filling property of the paste is improved. Therefore, the defective rate of the electrode plate is significantly reduced.

[Brief description of drawings]

FIG. 1 is a diagram of the relationship between the thixotropy and the defect rate, and FIG. 2 is the lead oxide of the present invention and the conventional lead oxide paste Pb.
FIG. 3 is a relationship diagram between the amount of SO ₄ and the thixo coefficient, and FIG. 3 is a relationship diagram between the median relation of the particle diameter of lead oxide and the thixo coefficient.

Claims (1)

(57) [Claims] 1. A lead oxide and water only or water and a thickener only,
Alternatively, it is a method for producing a lead storage battery electrode plate paste in which water and low specific gravity sulfuric acid are kneaded, wherein the lead oxide has a median diameter of particle size distribution of 0.5 μm or less, and the low specific gravity sulfuric acid is PbSO _{4 in} the paste. 5%
The method for producing a lead-acid battery electrode plate paste according to the following, wherein the paste has a thixotropy coefficient of 12 to 18%.