2nd csta webinar. container coatings
TRANSCRIPT
2nd CSTA Webinar.Container coatings
Kim Scheibel
Hempel China
29 October 2020
(14 slides)
Short intro to Hempel
29 October, 2020
• Founded in 1915
• Ready-mixed paints
• Partnerships with customers
• Respect and benefits for employees
• Support social, humanitarian, scientific and
cultural causes
• The Hempel Foundation established in 1948
is the sole owner of the Hempel Group
• Global presence for supply of container
coating (Newbuilding and Maintenance)
• www.Hempel.com
2
• Group Segment Director, Container
• Based in Shanghai/China since Oct. 2017
• Past experience during the last 40 years with
Hempel: Technical Service, Marketing,
Product management, Commercial,
Management, Member of Board of Directors
Short intro to Kim Scheibel
Agenda
- Container coating trends in China- Environmental regulations in China- What influences the best choice of a container coating system
- Container coating specifications- Storage containers tough life - Container coating repairs
29 October 20203
Container coating trends in ChinaDry cargo containers (ISO, shipping, storage, trading, rail)
▪ Most factories operate on one (1) shift only these days
▪ Limited production capacity available
▪ Waterborne coatings introduced in 2016/2017
▪ Large container factories have already increased their production line length
▪ Most factories have increase their ventilation and oven capabilities
▪ Most factories have chosen 3-coat systems for exterior and 2-coat for interior
▪ Ultra-high solids low VOC systems does currently not fit the application
equipment available
29 October 20204
Environmental regulations in China▪ Initially everyone understood the new regulation = Waterborne coatings
▪ The “understanding” has been corrected to be = Low VOC coatings.
▪ CCIA is acting as front runner in respect of VOC reduction (“self patrolling”)
▪ The rules are named GB & GB/T (Jiangsu province have own stricter rules - JB)
▪ VOC in waterborne coatings are measured excl. water (same as in USA)
▪ The VOC limits in the new rules refer to the coating being ready to apply i.e.
including the solvent added at the container manufacturer.
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29 October 20206
SB container coatings
Shopprimer S
R
Primer
Mid-coat
Topcoat
g/ltr
GB 30981-2020▪ Mandatory rules takes effect 1st Dec. 2020 valid
for all industrial coatings incl. container.
▪ Both waterborne and solvent borne coatings are
included
GB/T 38597-2020
▪ Recommended rules may be adopted by 1st
Feb. 2021 for industrial coatings incl. container.
▪ For containers only waterborne coatings are
included
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Shopprimers can still be solvent borne
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North: Cold winters
Central: Wet
South: Hot & humid
summers
What influences the best (& correct)
choice of a container coating system:1. Overall factory capability
2. Factory location
3. Environment
4. Temperature (winter/summer)
5. Line layout (no. of work stations)
6. Application equipment
7. Ventilation
8. Ovens
9. Quality control
10.Rules & Regulations (location dependent)
11.Potential cargo pick-up
12.…… COST
29 October 20209
Container coating specificationsAll corten steel areas
Abrasive blasted and shopprimed with 5-8mic Zinc rich epoxy
Exterior surfaces Interior surfaces
12-25mic Zinc rich epoxy 0-15mic Zinc rich epoxy
40mic Epoxy mid-coat 60-70mic Epoxy topcoat (FDA)
40mic Acrylic topcoat
100-110mic total 65-90mic total
(all thicknesses mentioned are DFT)
Other potential technologies
▪ This reefer container is 2 years old
▪ Protected by a 1-coat polyurea @ 100mic DFT
▪ Polyurea has to be applied by special 2-K pumps
▪ Dries/cures in 10min at 20°C
▪ Higher cost but potentially longer life
▪ Other technologies have been tested, but none have
made it as a serious contender to the existing
system, as all factories are build for 3/2-coat systems
▪ Smaller factories may be easier to convince to try a
new technology
29 October 202010
29 October 202011
Storage containers tough life ….Colour retention
▪ Constant exposure to UV (sun) from same side will eventually make acrylic
container topcoats fade, some colours faster than other.
▪ Optional change to polyurethane from NB (higher cost especially for WB)
Gloss retention
▪ Todays container topcoats are almost flat from newbuild
▪ Higher gloss alternatives are available, but factories do not like to use them as
steel “defects” are easier visible
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Storage containers tough life ….Condensation during storage
▪ Apart from installing extra ventilators (although not very effective when
container permanently stacked side by side), then an Anti-Condens coating can
be applied to interior roof and upper side wall.
▪ If an Anti-Condens coating is applied, then the coating system below has to be
completely intact with min. 90mic DFT everywhere as water will be temporary
absorbed in the Anti-Condens coating.
▪ An Anti-Condens coating system can be spray applied after arrival in a depot.
29 October 202013
Storage containers tough life ….Repair coatings
1. Irrespective of which coating system (SB or WB) have been applied from
newbuilding, then following repair / recoating procedure is vital
2. Surface preparation: a) Remove oil/grease
b) Remove rust and loose paint
c) Wash entire surface with fresh water to remove salts
d) Make sure surface is dry before painting (incl. dew point check)
e) Roughening of the surface improves the coating life time
3. Abrasive blast or power tool renewed (partial) steel plates, as well as
charred paint from gas cutter, then follow point 2) above afterwards
4. Both SB and WB 1-component DTM acrylics can be used for repairs over
existing systems. If applied by roller/brush then probably 3-4 coats are
necessary to achieve +100mic DFT in total. Spray application is preferred.
What can be done to upgrade a container in a reasonable condition to be used as a storage container ?
Upgrades possible on location (yard, depot, storage ground, etc.)
▪ A glossy topcoat exterior will remain cleaner (lower roughness when applied by airless spray)
▪ If containers are stacked side-by-side, potentially only visible areas need to be “upgraded”
▪ Coat the wooden floor, apply 1-2 coats of epoxy (dilute 1st coat min 30% + 2nd coat undiluted)
▪ Apply an Anti-Condens coating to the interior celling + 1-2 feet down the sides
▪ The container in the back-ground was one of the first waterborne containers build in 1990 with
a glossy topcoat. They were retired after 16 years without any abnormal extra maintenance
cost
29 October 202014
