POWDERED POLYMER PAINTS USED AS PROTECTIVE LUBRICANTS
IN THE PRODUCTION OF REFRACTORIES, CONSTRUCTION BRICKS,
AND CERAMIC COMPONENTS
V. F. Shishkin,
Yu. I. Spasskii,
S. V. Kurlakov,
and I. S. Kurlakova
Translated from Ogneupory i Tekhnicheskaya Keramika, No. 2, pp. 37 – 39, February, 2002.
A new technique for coating the frames of drying cars using polymer powdered paints rather than the conven
tional minium is proposed. The advantages of this method — extended service life of the frames, reduced re
jection rate of substandard product, increased utilization of post-service frames — have provided a savings of
1,816,620 roubles/year, allowing for the costs of purchase and installation of the processing line. Polymer
powdered paints can be used in the production of refractories, construction bricks, and ceramic components as
an efficient protective coating for the frames of drying cars.
Drying is an important phase in the industrial production
of refractories, building bricks, and ceramic components.
The starting raw mixture is moistened prior to molding; after
molding, it is dried. On the one hand, the drying regime
should provide fast removal of moisture; on the other hand,
the drying rate should not affect adversely the shape, appear-
ance, and mechanical strength of the semifinished product.
Therefore drying is an extended process exposed to tempera-
ture, high humidity, and corrosive media (considering that
the waste gas from drying kilns is commonly used for drying).
This drying technique causes corrosion and shortens the
service life of the manufacturing equipment, which, in turn,
leads to substandard products. The use of protective lubricants
helps little to rectify the deficiencies of the drying process.
At the Sukholozhskii Refractory Plant JSC, losses due to
rejects over an operating period of six months amounted to
261,803 roubles (the raw preforms were dried on steel
frames painted with minium. Over this period, 3920 frames
were put out of commission (14% of the total number of
frames used), which amounted to a loss of 509,953 roubles.
Furthermore, losses because of rejects of the remelted mate
rial (corroded scrap frames) amounted to 201,840. The over
all losses were thus 973,596 roubles.
As is known , powdered polymer paints are capable of
forming coatings with high mechanical and anticorrosion
properties on metals. Therefore, we thought it might be pos
sible to use such paints as protective lubricants in the produc
tion of refractories, namely, in the drying phase. An experi-
mental study of the lubricating properties of powdered poly-
mer coatings was performed, and a pilot batch of painted
frames was tested at the Sukholozhskii Refractory Plant JSC
to see whether the coatings retain their mechanical and anti-
corrosion properties under “aggressive” drying conditions.
Generally, indirect methods are used to test lubricating
materials for efficiency. The most popular, because of their
simplicity, are methods in which the tested specimen is de
posited between two parallel plates (“faces”) [2–5]. How
ever, the use of these methods for testing highly-efficient lu
bricants meets with difficulties, because during the deposi
tion the specimen may squeeze out or slip away from the
space between the top and bottom faces owing to the low
contact friction. Therefore, a new technique for testing the
lubricating properties of powdered polymer coatings was de
veloped involving the following operations:
– upsetting metal specimens of cylindrical shape placed
between two flat faces, with the coating under study applied
to the edge surface of one of the faces;
– measuring the angle j characterizing the curvature of
the side surface of the upset specimen in contact with the
– calculating the value of cos j;
– evaluating the lubricating ability of the coating in terms
of cos j (0 = cos j£1): the higher the lubricating ability of
coating, the smaller the value of cos j, and vice versa.
The friction index cos j, like the familiar friction coeffi
cient m, gives a measure of contact friction; however, the
technique proposed allows determination of cos j with a
Refractories and Industrial Ceramics Vol. 43, Nos.1–2, 2002
1083-4877/02/0102-0076$27.00 © 2002 Plenum Publishing Corporation
Sukholozhskii Refractory Plant Joint-Stock Co., Sukhoi Log,
Sverdlovsk Region, Russia; Politon-K Joint-Stock Co, Russia;
Ural State Technical University (UPI), Ekaterinburg, Russia.