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Paste
GB’s advanced paste formula is just one of many components that make
our products the highest quality and longest lasting in the industry.
Description:
The paste used in an industrial
battery’s “plates” is one of the most critical aspects of the manufacturing
process. There are many formulas for pastes, which are later converted into
active material, and each is considered a trade secret by the manufacturer
using it. The basis of all, however, is oxide of lead, either Red Lead (Pb304),
Litharge (PbO), or a mixture of the two, made into a paste with a liquid, such
as dilute sulphuric acid. The object of mixing the oxides with the liquid
is to form a paste of the proper consistency for application to the grids,
and at the same time introduce the proper amount of binding, or setting
agent which will give porosity, and which will bind together the active
material, especially in the positive plate. Red lead usually predominates
in the positive paste, and litharge in the negative, as this combination
requires the least energy in forming the oxides to active material.
The oxides of lead used in preparing the pastes which are applied
to the grids are powders, and in their dry condition could not be applied
to the grids, as they would fall out. Mixing them with a liquid to make a paste
gives them greater coherence and enables them to be applied to the grids.
Sulphuric acid puts the oxides in the desired pasty condition, but has the
disadvantage of causing a chemical action to take place which changes a
considerable portion of the oxides to lead sulphate, the presence of which
makes the paste stiff and impossible to apply to the grids. When acid is
used, it is therefore necessary to work fast after the oxides are mixed
with sulphuric acid to form the paste.
In addition to the lead oxides, the pastes may contain some binding
material such as ammonium or magnesium sulphate, which tends to bind the
particles of the active material together. The paste used for the negatives
may contain lamp black to give porosity.
Applying the
Paste to the Grid: After the oxides are mixed to a paste they are
applied to the grids. In the hand pasting process, the pastes are applied
from each face of the grid by means of a wooden paddle or trowel, and are
smoothed off flush with the surface of the ribs of the grid. This work is
done quickly in order that the pastes may not stiffen before they are
applied.
Typically, plates that are pasted in a machine which applies the
paste to the grid, subjecting it at the same time to a pressure which
forces it thoroughly into the grid, and packs it in a dense mass.
Drying the
Paste: The freshly pasted plates are now allowed to dry in
the air, or are dried by blowing air over them. In any case, the pastes set
to a hard mass, in which condition the pastes adhere firmly to the grids.
The plates may then be handled without a loss of paste from the grids.
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Last Updated: Monday, December 03, 2007 - 7:02 AM Eastern Time.
 
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