Introduction
MELCROSS-11
is designed as a Mixed methyl-butyl
type with approximately 75:25
ratio of methoxy and butoxy
functionality.
It is a versatile crosslinking
agent for a wide range of polymeric
materials, both organo-soluble
and water-borne.
More fully alkylated
coetherified resin, resulting
in very low molecular weight
and low viscosity at 98%up solids.
Designed for low VOC,
high solids coatings.
The highly monomeric
nature plus low tendency for
self-condensation contribute
to excellent flexibility.
Butoxy groups provide
for good adhesion, flow, and
leveling.
Very low free formaldehyde,
the balance of monomeric /oligomeric
species in MELCROSS-11 contributes
to the cure response of high
solids coatings, especially
at reduced temperatures.
So,
you can get both benefit from
the property of methylation
and butylation by this resin
in one formulation.
MELCROSS-11 is soluble in most
commonly used organic solvent
but solubility in water is limited-when
blended with most other water-
reduciable resins, tolerates
dilution in water.
The polymeric materials
would include alkyds, polyesters,
acrylic, epoxy, urethane, and
cellulosics.
The presence of butoxy
functionality in this crosslinker
contributes hydrolytic stability
to coating formulations, and
results in good salt-spray resistance,
improved flow, leveling and
cratering resistance in coating
formulations, plus better intercoat
adhesion.
The polymeric materials
should contain either hydroxyl
or amide groups.
The reaction of MELCROSS-11
with hydroxyl, carboxyl and
amide functionalities on other
polymers is typically catalyzed
with strong acid because of
its high extent of alkylation.
It should be added just
prior to use to prevent pot
life instability.
Application
Water- borne and solvent
free general industrial baking
enamels.
Automotive baking enamels.
Useful
uses in Automotive Finishes.
MELLCROSS-11 is useful
for baking enamel of car coatings.
The two major types of
finishes on automobiles are
the forced-dried nitrocellulose
lacquer finishes and the baking
alkyd-amino resin finishes.
Although the lacquer
finishes are only forced ?dried
at temperatures as low as 70-82∑C
for about 1 hour, it appears
that a small percentage of melamine
resin improves the waterspot
resistance and gloss retention
of such finishes.
The alkyd-amino type
finishes are baked from 30 to
45 min. at 135-150∑C.
The fast- drying, medium
oil type alkyds are used with
amino resins.
If the alkyds are used
alone, a small amount of metallic
drier is usually added to reduce
the baking time, but if the
coating is applied a little
more heavily than usual, it
will wrinkle badly when it is
baked.
This then requires an
expensive clean-off and refinishing
operation.
In general, amino resins
will prevent the wrinkling when
used in amounts as low as 10%
of the total resin content.
Urea resins were utilized
for this purpose before melamine
resins became available; but,
where cost will permit, the
melamine resins are preferred
because of their superior durability.
The amino resin also
increases the surface hardness
so that the finish is considerably
more resistant to scratching
and surface marring than a straight
alkyd resin finish.
Typical
properties
Appearance |
|
Clear,
viscous liquid |
Non-volatile |
wt.% |
98min. |
Color,
Gardner1963 |
|
Max. 1 |
Viscosity,
Cone/Plate |
cps |
900-2300 |
Specific
gravity |
25∑C |
1.2 |
Flash
point, Closed cup |
∑F |
150 |
Free
formaldehyde |
Wt.% |
Max.0.5 |
SAFETY
General
Attention must be paid
to the normal precautions for
handling chemicals and to the
measures prescript in the local
health regulations.
The work place must be
well ventilated, skin care measures
should be adapted and safety
google should be worn.
Safety
data sheet
P&ID Co.,LTD shall
provide MSDS associated with
MELCROSS
-11
as your request. MSDS of
MELCROSS-11
Storage
If MELCROSS-11 is kept
in tightly closed drums or in
storage tanks in the cool place,
its shelf life is 12 months.
Remark
This information is given
without any warranty or representation.
We do not assume any legal responsibility
for same, nor do we give permission,
inducement, or recommendation
to practice any patented invention
without a license.
It is offerd solely for
our consideration, investigation
and verification.
Before using any product,
read its label. |