1070-4272/03/7606-1002 $25.00 C 2003 MAIK [Nauka/Interperiodica]
Russian Journal of Applied Chemistry, Vol. 76, No. 6, 2003, pp. 1002!1005. Translated from Zhurnal Prikladnoi Khimii, Vol. 76, No. 6, 2003,
Original Russian Text Copyright + 2003 by Gladkikh, Kolosnitsyn, Cherkasov, Sheina, Karaseva.
AND POLYMERIC MATERIALS
Swellability of ASMOL Protective Coating in Water
and Aqueous Salt Solutions
I. F. Gladkikh, V. S. Kolosnitsyn, N. M. Cherkasov, L. V. Sheina, and E. V. Karaseva
Institute of Organic Chemistry, Ufa Scientific Center, Russian Academy of Sciences, Ufa, Bashkortostan, Russia
Poisk Research Center, Ufa, Bashkortostan, Russia
Received March 5, 2003
Abstract-The swellability of a new material for protective coatings, ASMOL (asphalt3resin oligomer), in
water and aqueous salt solutions was studied gravimetrically and by thermogravimetric analysis.
Pipelines are today the main means of transporta-
tion of crude oil, petroleum products, and natural gas.
Various protective coatings are used for preventing
pipeline corrosion. The reliability of protective coat-
ings largely determines the failure-proof operation of
pipelines. For example, almost 40% of all pipeline fai-
lures are due to corrosion damage.
The diversity of soil and climatic conditions under
which pipelines are exploited, and also high mechani-
cal and thermal loads impose stringent requirements
upon protective coatings. The insufficient assortment
of corrosion-protective materials produced in Russia
and the growing requirements to their quality call for
development and production of new insulating coat-
ings suitable for diverse service conditions.
The first representative of a new generation of
protective coatings is ASMOL (asphalt3resin oligo-
mer) [1, 2]. ASMOL is a product of catalytic reaction
of propane-precipitated asphalt with bottom residues
from regeneration of dimethylformamide in isoprene
production. ASMOL is a uniform product incorporat-
ing compounds of varied chemical nature. The main
difference between ASMOL and asphalt is the pres-
ence in ASMOL of compounds containing highly
polar functional groups and exhibiting chemical and
surface activity: amide, sulfone, and sulfonic acid
groups. Therefore, ASMOL has high adhesion to
An important service parameter of polymeric pro-
tective coatings, determining the rate of metal corro-
sion, is their swellability in water and aqueous salt
solutions. Therefore, we analyzed in this study the
swellability of ASMOL in water and aqueous NaCl
The swellability of ASMOL was determined in
water and in 3, 6, and 9% NaCl solutions gravimetri-
cally and by thermogravimetric analysis.
Two types of ASMOL samples were tested. Sam-
ples of the first type were neat 1.231.3-mm-thick
ASMOL plates of the area 6 cm
, and samples of
the second type, St.3 steel plates coated on both sides
with a 1.231-3-mm layer of ASMOL. The surface area
of the ASMOL-coated steel plates was also 6 cm
fabrication of samples of the second type, the coating
continuity was checked visually.
Samples prepared for tests were placed in hermet-
ically sealed vessels filled with water or aqueous salt
solution and kept at room temperature (20325oC)
for a prescribed time. To determine the amount of
absorbed water, samples were removed from the ves-
sel, water drops were removed from the surface with
filter paper, and the samples were weighed on an ana-
lytical balance. For thermogravimetric studies, a piece
of the swollen material was separated from one of
replicate samples. After weighing, the samples were
returned to the same vessels. The swollen samples
were weighed at 203 60-h intervals depending on the
moisture absorption rate.
Thermogravimetric experiments with ASMOL
were performed on an MOM derivatograph (Hungary).
The sample weight was 1003200 mg. Thermal degra-
dation of ASMOL samples was performed in open
corundum crucibles in air. With the aim of uniform
heating, the crucibles were placed in a quartz beaker.
Aluminum oxide was used as reference. The heat-