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The Impact Of Temperature On Common Paint Defects
- 1. THE IMPACT OF TEMPERATURE
ON COMMON PAINT DEFECTS
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- 2. • DESIGNERS AND MANUFACTURERS OF ADVANCED POINT-OF-USE TEMPERATURE AND
VISCOSITY CONTROL SYSTEMS FOR INDUSTRIAL FLUID DISPENSING PROCESSES SINCE
1990
• SPECIALIZING IN BOTH RECIRCULATING AND “DEAD-END” SYSTEMS WITH MORE
THAN 3500 ACTIVE INSTALLATIONS
• LOW VISCOSITY (<1 CPS) TO HIGH VISCOSITY (>1,000,000 CPS) APPLICATIONS
STANDARD AT PRESSURES FROM 0.4 BAR (5 PSI ) – 400 BAR (6000 PSI)
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- 3. SO WHO CARES?
• THOSE 3500+ TEMPERATURE CONTROL INSTALLATIONS
INVOLVED SOME OF THE TOUGHEST APPLICATIONS IN
PARTNERSHIP WITH DEMANDING CUSTOMERS LIKE:
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- 4. (Valspar - 080 White Polyester)
Data Courtesy of
Alsco Metals Corporation
10
15
20
25
30
35
40
45
50
55
60
15 20 25 30 35 40
Temperature (°C)
Viscosity
(Zahn#4Seconds)
PAINT VISCOSITY VS. TEMPERATURE
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- 6. FACTORS THAT AFFECT TEMPERATURE
• PAINT AREA AMBIENT TEMPERATURE
• PAINT STORAGE TEMPERATURE
• VOLUME OF PAINT IN SOURCE CONTAINER
• PAINT FLOW RATE
• RECIRCULATION RATE
• RECIRCULATION PATH
• PAINT PRESSURE SETTINGS
• PUMP TYPE / HORSEPOWER
• SHEAR (REGULATOR, NOZZLE, FITTINGS, ETC.)
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- 7. IMPACT OF TEMPERATURE VARIATIONS
• PAINT TEMPERATURE INVERSELY AFFECTS VISCOSITY
• HIGHER TEMPERATURE = LOWER VISCOSITY
• IMPROVED FLOW-OUT (SURFACE FINISH)
• REDUCED FLASH-OFF TIMES
• FASTER CURE TIMES
• LOWER TEMPERATURE = HIGHER VISCOSITY
• REDUCED FLOW-OUT
• INCREASED FILM THICKNESS
• SLOWER CURE TIMES
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- 8. IMPACT OF TEMPERATURE VARIATIONS
• ON PROCESS:
• ATOMIZATION
• TRANSFER EFFICIENCY
• FILM BUILD
• FLOW OUT
• CURE RATE
• UNPREDICTABLE SETUPS
• VARIATIONS DURING RUN
• ON QUALITY:
• DRY FILM BUILD
• COLOR SHIFT
• RUN & SAG
• ORANGE PEEL
• GLOSS ISSUES
• POOR ADHESION
• BLISTERING/POP
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- 9. TEMPERATURE RELATED DEFECTS
• DRY SPRAY
• HIGHER PAINT TEMPERATURE
• SMALLER DROPLET SIZE
• SOLVENT EVAPORATES BEFORE PARTICLE HITS PART
• COLOR SHIFT
• COLOR IS OFTEN RELATED TO FILM BUILD
• LOW FILM CAN’T HIDE SUBSTRATE/PRIMER
• HIGH FILM CAN DISTURB FLAKE LAY IN METALLICS
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- 10. TEMPERATURE RELATED DEFECTS
• RUN & SAG
• LOW VISCOSITY + HIGH FILM
• HIGH VISCOSITY + HIGH FILM
• GLOSS ISSUES
• UNEVEN FILM
• IMPROPER FLOW OUT
• ORANGE PEEL
• EXTREME FILM VARIATION
• IMPROPER FLOW OUT
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- 12. THE STRUCTURE OF ORANGE PEEL
Substrate
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Short Variations
Long Variations
- 13. TEMPERATURE RELATED DEFECTS
• ADHESION ISSUES
• UNEVEN FILM
• IMPROPER FLOW OUT
• SOLVENT TRAPPED UNDER CURED SURFACE
• BLISTERING & POP
• UNEVEN FILM
• MORE SOLVENT TRAPPED UNDER CURED SURFACE
• SOLVENT PRESSURE EXCEEDS FILM STRENGTH
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- 14. THE EFFECT OF FILM BUILD ON CURE
Slower Cure
Faster Cure
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Substrate
- 15. FILM BUILD RELATED DEFECTS
Blisters/Uncured
Coating
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Substrate
- 16. THANK YOU!!
PLEASE COME SEE US AT:
www.viscosity.com
AND VISIT OUR BLOG AT:
blog.viscosity.com/blog
AND OUR YOUTUBE CHANNEL:
https://www.youtube.com/channel/UCVyAgTJtgNZTozqFeBc
CeNA
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