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Monsoon Tips
The next few weeks will be dominated
by monsoon rains. The moist and humid atmosphere is known
to have adverse effects on the powder coating process.
Mr. Nirmalya Chakravorty Manufacturing
& Technical Manager - Industrial Coatings Akzo Nobel
Coatings India Private Limited provides these tips to our
subscribers.
1. |
The golden rule is
store in a cool and dry place. |
2. |
As long as the
powder is in a sealed plastic bag, it is safe.
Any opened bag must be tied tightly to make it
air tight. |
3. |
During application
the booth air is best maintained at a R.H. of 45
to 65%. |
4. |
The good news is
powder having higher moisture content can be
dried very quickly by fluidizing it little longer
with dry compressed air which takes away the
moisture. |
5. |
Moisture in
compressed air must be checked to avoid choking
of fluid bed and film defects from water droplets
landing on the substrate from the spray gun to
form craters. |
6. |
Some moisture is
desirable in powder(~0.3 to 0.5%) for better
chargeability and fluidity(low % of adsorbed
moisture plays the role of lubricant between the
particles). |
7. |
The most common myth
is powder lumps from high moisture content. This
is not true as powder is not wetted by moisture.
Lumping occurs from high temperatures, low Tg
resins, too much flow aid or other additives
having liquid components. |
Powder Coating on Plastics
(MS Rawat, Manager
Product Development Asian paints (I) Ltd answers a query
from on of our subscriber Mr. Jagannivas Kamat)
Mr. Jagannivas Kamat:
Please let me know if abs plastics can be
powder coated. Is there a powder coating process for
plastics.
Mr. MS Rawat: Yes,
plastics can be coated with powder coatings.
However as you are aware that these are heat sensitive
substrates hence either UV powder or low temperature
curing powders are suitable for coating such heat
sensitive substrates. In fact, at the recently held
Powder Coating Europe 2002 coating show at Nuremberg, UV
curing powder coated cell phone casings were showcased as
the latest application area for powder coatings.
Besides heat sensitivity another problem is that of
conductivity. For this purpose either the plastic is
filled with a conductive filler like carbon or graphite
during its manufacture or alternatively then a very thin
(5 - 7 microns) conductive liquid coating is first
applied as a conductive primer followed by powder
coating.
With the development of UV curable powders many new areas
of application of powder coatings have opened up. Another
noteworthy point is that due to the high cost of UV
curable powders and UV curing equipment the
commercialisation process of this new technology is a bit
slow. As an economical alternate many raw material and
powder manufacturers are trying to develop low
temperature powder coatings. However they will have
limited storage stability and will not be suitable to
high atmospheric temperatures as those encountered in
India (avg 50°C)
UV Cured Powder Coating
(Mr. Arjun Sen, Business
Consultant.)
Powder coating continues to be the fastest growing of all
the finishing technologies, and for good reason. Powder
coatings are free of solvents, 100% solid coatings that
provide durable and attractive finishes. Until now the
benefits of powder coatings were generally available to
manufacturers of metal products, such as appliances,
furniture, garden equipment, equipment for processing
machinery, automobile ancillaries and, only recently, to
automotive vehicles themselves. Today, a variety of
ultraviolet (UV) curable materials are bringing the
environmental and performance benefits of powder coating
to the medium density fiberboard (MDF) and natural wood
product industries.
Over the past few years, major powder and resin
manufacturers have made significant progress in
developing powder materials that can be applied to
substrates other than conventional metals. MDF, wood,
glass and plastics comprise the major of these alternate
substrates. The primary goal of the powder development
effort has been to provide a powder coating process that
does not compromise end user expectations for hardness,
durability, moisture resistance, colour and luster.
Aggressive development of both thermoset and UV curable
powders reflects an understanding of the commercial
potential. Within recent years, UV powders have emerged
that are commercially suitable for heat sensitive
substrates. These include both non-metallic and metallic
substrates with heat sensitive components, that fall into
three general categories:
You may read the complete article in
the magazine section on
http://www.ipconweb.com/articles/arjun013.htm
Paint With Heavy Medals
Recalled
Thu May 23, 7:41 PM ET<
http://story.news.yahoo.com/news?tmpl=story&u=/ap/20020523/ap_on_bi_ge/paint_recall_1
>
ST. PAUL, Minn. (AP) - Govesan America Corp. is recalling
industrial powder-coat paints marketed as metals-free
because the paint actually contained heavy metals, two
state agencies said Thursday.
Under an agreement with the Minnesota Pollution Control
Agency and the Minnesota Occupational Health and Safety
Administration, Govesan issued the national recall of the
paints which contained lead, cadmium and
hexavalent chromium and agreed to pay a $240,000
penalty, the agencies said.
Minnesota law requires companies with products containing
any of the three metals or mercury to register those
products with the state. The action was the first ever
taken against a company for failing to register such
products, the agencies said.
In March 2001, the agencies alerted Govesan customers
that had purchased the powder-paints that certain lots
contained heavy metals not listed on data supplied with
the paints.
According to company records, about 5 percent of the
coatings imported since 1994 are affected by the recall.
Since March of this year, Govesan has completed a testing
program and assured that all products being sold do not
contain more than regulated levels of the heavy metals,
the agencies said.
Customers who received the products between 1994 and
March 2001 will receive a letter from the company
identifying the products and giving instructions for
returning them to Govesan America, based in Woodbury.
Govesan America is a subsidiary of Govesan S.A., a
privately held corporation headquartered in Spain.
A toll-free telephone number has been set up for customer
inquiries: 1-800-494-1543
Further details on http://www.govesan.com/HOT%20TOPICS.html
India paints: Growth
prospects
(European Coatings Flash -
June 03, 2002)
Growth markets in India are
relatively limited. For instance, the per capita
consumption of paint is quite low compared to
neighbouring countries such as Sri Lanka and Bangladesh
where there is considerable potential. While Asian Paints
and Berger have global interests, the proportion of
incomes from international market, as a portion of total
revenues, is still negligible. Given that growth
opportunities have stagnated in some of the segments, it
would be no surprise if the focus is on the international
market. The performance of the automobile industry over
the next four-six quarters will be crucial for the growth
rates in the industrial paints segment. The growth rates
may be stable there. As setting up distribution
infrastructure is expensive, it would mean that the
competition is limited to the top players.
Akzo Nobel opens
international research centre in India
(European Coatings Flash -
June 10, 2002)
Akzo Nobel has opened an international research center in
Bangalore, India for its car refinishes business. The
center will play a major role in the development of new
products and color formulations for the global and
regional refinishes markets. "With this new R&D
facility in India we underscore the global nature of our
car refinishes business and our ambition to grow in the
Indian and Asian markets," said Rudy van der Meer,
Akzo Nobel's Board Member responsible for Coatings.
"Technological expertise is of paramount importance
for coatings in general and for car refinishes in
particular and this research center gives us a window on
available talent in India in order to enhance our
technological leadership."
"The establishment of a research center in India
reemphasizes Akzo Nobel's commitment to India,"
added Cor de Grauw, General Manager Akzo Nobel Car
Refinishes. "The center will play a major role not
just in growing the market for car refinishes in India,
but it will also help meet the needs of the global and
regional car repair industry. With its availability of
skilled manpower and economies of scale, India is ideally
suited to meet the requirements of our hi-tech research
center."
Built on a total area of 2,325 m² at Hoskote, Bangalore,
the new R&D facility is part of a unit of Akzo Nobel
Car Refinishes India, which was incorporated in 1997.
Besides the R&D facility Akzo Nobel Car Refinishes
has set up a Car Refinishes Instruction Center (CRIC) in
Bangalore, which provides hands-on training to painters,
bodyshop owners and managers. Apart from the new
international research center in India, Akzo Nobel Car
Refinishes has two other global research centers in
Sassenheim, the Netherlands and Troy, Michigan, United
States.
Loctite
to be renamed Henkel Loctite
(European Coatings Flash -
June 24, 2002)
Loctite Corporation, Rocky Hill, Connecticut, USA, has
changed its name in the USA to Henkel Loctite
Corporation. In the near future, Loctite companies in
other countries around the world will follow suit.
Loctite is the brand under which the Henkel Technologies
business sector of the Henkel Group markets a broad range
of engineering adhesives.
"Following the acquisition of Loctite Corporation in
1997, the Henkel Group is making a specific statement
with this change of name. By renaming the Loctite
Corporation, and successively renaming all Loctite
companies worldwide, we are communicating to customers
and staff that Loctite today is an integral part of
Henkel and its Henkel Technologies business sector,"
explains Heinrich Grün, division head of Loctite
Engineering Adhesives in the Henkel Group. "We
intend to rename all Loctite sites around the world or to
integrate them in the respective Henkel national
companies."
Loctite Engineering Adhesives operates in markets as
diverse as electronics, automotive, aerospace, biomedical
and general industry. In 2001, Loctite recorded sales of
over 1 billion euros, thus ranking among the leading
suppliers in these segments.
Sherwin-Williams recognized
for donation of paint for Pentagon rebuilding
(European Coatings Flash -
June 24, 2002)
The Sherwin-Williams Co. has received a "Piece of
the Pentagon" award in recognition of the company's
donation of 10,000 gallons of paint used to help repair
damage caused by the Sept. 11 terrorist attack on the
Pentagon building in Washington. The award was presented
during ceremonies in Washington, during which
Sherwin-Williams Chairman and CEO Christopher M. Connor
also presented a commemorative paint can to Lee Evey,
Pentagon renovation program manager."The
contribution made by Sherwin-Williams is representative
of the American spirit to see the Pentagon made whole
again," Evey said. Following the presentations, an
assembly of Pentagon representatives and other government
and military officials moved to the interior of the
building for a "First Swipe of Paint" ceremony
marking the start of painting of the rebuilt section of
the Pentagon. Evey and Connor each applied a roller full
of paint in a restored portion of the building.
"Sherwin-Williams is proud to be a part of this
rebuilding effort," Connor said. "We hope this
gesture will, in some way, honor those who lost their
lives in the Sept. 11 attacks and lift the morale of
those who, each day, work in this building and on
behalf of the American people."
U.S. Senators R. Michael DeWine and George V. Voinovich,
both of Ohio, commended Cleveland-based Sherwin-Williams.
"I am proud that Sherwin-Williams has stepped
forward to help make Ohio's contribution to the Pentagon
rebuilding efforts," DeWine said. "Such
generosity is symbolic of our great American way of
life."
Future
Vehicles predicted to be coated with foil instead of
paint
(PRA News of the Month -
June 2002 http://www.pra.org.uk/publications/newsofthemonth/nom-current.htm )
The RAC Foundation has produced a projection of what a
family car will look like in 2050. It predicts cars will
be smaller and taller to conserve roadspace offering as
much comfort as possible. Fuel cells will power the
vehicle (the Foundation predicts fuel cells will be as
common as diesel or petrol engines by 2030). Paint will
be replaced by durable, coloured foil applied to the
bodywork - which will be made of a tough, plastic
composite 'skin'. (Evening Standard, 17 May 2002, 18)
Standards
(PRA News of the Month -
June 2002 http://www.pra.org.uk/publications/newsofthemonth/nom-current.htm )
The following developments have taken place recently:
BS EN ISO 1519:2002; BS 3900-E1: 2002: Paints and
Varnishes - bend test (cylindrical mandrel)
BS ISO 15741: 2001: Paints and Varnishes -
friction-reducing coatings for the interior of onshore
and
offshore steel pipelines for non-corrosive gases
For further information, please go to: http://www.bsi-global.com
Exhibitions and Seminars
(PRA News of the Month -
June 2002 http://www.pra.org.uk/publications/newsofthemonth/nom-current.htm)
ATHENS CONFERENCE 2002:
COATINGS SCIENCE & TECHNOLOGY
1-5 July 2002, Athens, Greece
For further information, please contact: Institute of
Materials Science, Division of Program Organisation, PO
Box 369, New Paltz, New York, 12561 USA. Tel: + 1 914 255
0757; Fax: + 1 914 255 0978. Alternatively,
please go to: http://www.ims-np.org
HYGIENIC COATINGS
8-9 July 2002, Brussels, Belgium
For further details, please go to: http://www.hygienic-coatings.com
PANAMERICAN EXPO 2002
17-19 July 2002, Mexico City, Mexico
For further information on this exhibition and
conference, please contact: Federation of Societies for
Coatings Technology, 492 Norristown Rd, 19422-2350 Blue
Bell, PA, USA. Tel: + 1 610 940 0777; Fax: + 1 610 940
0292; http://www.coatingstech.org
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