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Introduction:
Skinning is the biggest nuisance in protective coatings. Skinning causes the
avoidable waste of a costly coating material.
Paint containers are not always filled to the brim. So air present in a void
reacts with the paint, thereby causing oxidation and polymerization of the
coating at the air/paint interface. This results in formation of a solid skin
during storage.
The lost of paint due to skinning is estimated to be as much as 3 to 5%. This
not only worries the consumers but also the manufacturers when it comes to
filling of small containers. The minute doze of an effective anti-skinning agent
can alleviate the difficulty of skinning.
GUJOXIME is 99%
pure Methyl Ethyl Ketoxime i.e. MEK Oxime. It is one of the finest anti-skinning
agents of its kind available from GSFC. It has proved very effective in
preventing the formation of surface skin in the packaged solvent based paint,
varnishes and printing inks also.
Technical
Specifications:
| Appearance |
:
Clear limpid liquid |
| Colour |
:
Coloureless to pale yellow |
| Odour |
:
Mild and Pleasant |
| Specify
gravity |
:
0.916 to 0.924 at 25°C |
| Ref. Index |
:
1.442 to 1.444 at 20°C |
| Assay |
:
99% by G.C. |
| Flashed Point
(Tag closed cup) |
:
60°C Min. |
Advantages
of using Gujoxime:
-
GUJOXIME
has high solvent power and compatibility with a variety of paints and
varnishes.
-
GUJOXIME has very high potency. only a small addition is adequate to
eliminate skinning.
-
GUJOXIME
does not interfere with other ingredients of paints and varnishes.
-
GUJOXIME
neither affects the rheological properties of paint nor the durability of
the resultant film.
-
GUJOXIME
retards loss of dry paint during storage.
-
GUJOXIME
is neutral and does not cause any chemical reaction with the paint or
varnish.
-
GUJOXIME
being completely volatile, leaves no residue or odour in the paint film.
-
GUJOXIME
does not produce any deleterious effects in paints or varnishes when used in
normal dosage.
-
GUJOXIME
is coloureless and completely volatile.
-
GUJOXIME
provides maximum anti-skinning activity.
-
GUJOXIME
does not affect the drying time of the paints or varnishes in which it is
used as suggested.
-
GUJOXIME
does not cause pigment vehicles separation.
-
GUJOXIME
has only negligible effect on the cost of the finished
coating.
Applications:
GUJOXIME is an essential additive and an ideal anti-skinning agent for all
paints, varnishes and printing inks.
Recommended Dosage:
The recommended dosage very much depends on the paint or varnish formulation but
as a rule 1.0 - 2.0% based on vehicle solids (oil and resin portion of the paint
formulation, also known as binder portion) is very effective in most cases.
GUJOXIME should be added during the thin down operation. For convenience of
addition, GUJOXIME can be diluted with the normally used solvents.
Efficiency Test for Gujoxime :
Prepare :
1). 50% solution of resin in white spirit
2). Drier solution of Cobalt Octoate 1% Co and Lead Octoate 3% Pb.
3). 10% W/V solution of GUJOXIME in white spirit
Procedure :
Add 5 ml of GUJOXIME solution to 100ml of the resin solution. Add 2.5 ml each of
the drier solution to the mixture. Transfer the solution to a 500 ml wide mouth
reagent bottle. Close the bottle with a one holed cork. Insert a glass-tube
through the cork into the void above the liquid without touching its surface.
Prepare an identical system but without addition of GUJOXIME solution.
Keep the bottles in a dark place.
Observe the skinning tendency in both the bottles periodically.
Results:
Varnish containing GUJOXIME will not skin where as about 3% skin will be found
after seven days in varnish not containing GUJOXIME.
Packing:
Gujoxime is available in 25 kg. HDPE carbuoys.
For your requirement, please contact:
The Chief Marketing Manager
(HP)
Gujarat State Fertilizers Co. Ltd.
P.O. Fertilizernagar - 391 750, Dist. Vadodara.
Telex : 0175-211/384. Gram:Fertilizer
Phones: 72451 - 72641-72651 - 72751
For North, South & West
Zones
Dura Chemical Corpn. Pvt, Ltd.,
Wakefield House, 11 Sprott Road, Ballard Estate,
Bombay - 400 038
Telex : 011-73312. Gram:DURACOMCO
Phones : 260121 - 263199
Note : The information
obtained in this publication is given in good faith for the general guidance
only and GSFC makes no guarantee of data and assumes no obligation or liability
in connection with its advice.
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