UV Product Range Current UV Curable Range UV40 Background Released in 2006 UV curable acrylated polyurethane chemistry Allows fast throughput for high volume production UV Product Range ID: 911970
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Slide1
UV Product Range
Slide2UV Product Range
Slide3UV Product Range
Current UV Curable Range
UV40 - Background
Released in 2006
UV curable
acrylated
polyurethane chemistry
Allows fast throughput for high volume production
Slide4UV Product Range
Current UV Curable Range
UV40
- Range
UV40
UV40-250
UV40-100
UV40-HV
UV40
Gel
UV40 Solar
Viscosity
(
cPs
)
500
250
100
3000
Gel,
Shear
thinning
500
Application
Methods
Selective
spray
Selective spray, dip
Selective
spray
Syringe
dispenser
Syringe dispenser
Selective spray
Markets
Military
Consumer
Automotive
Consumer
Consumer
Micro electronics
Any – for
connectors
etc
CPV, LED
Slide5UV Product Range
Current UV Curable Range
UV40 range – Markets
Slide6UV Product Range
Current UV Curable Range
UV40 – distribution of sales
Percentage of UV40 Sales
Slide7Performance and Benefits
Technical information - Properties
UV Product Range
Can be applied with all selective coaters
Electrical, physical, mechanical properties designed for current industry demands – VOC free,
Pb
free, no clean
Slide8Performance and Benefits
Technical information – Comparison to Silicones
UV Product Range
Slide9Performance and Benefits
Technical information – Comparison to Acrylics
UV Product Range
Slide10Performance and Benefits
Technical information – Comparison to Urethanes
UV Product Range
Slide11Performance and Benefits
Explanation
UV Product Range
Increased material costs but 100% solids material
Better all round performance – has benefits of urethane and acrylate chemistry
Flexibility through only bettered by silicones – lets explain…
Slide12Performance and Benefits
Physical properties
UV Product Range
T
g
(°C) –
Glass Transition Temperature
.
The temperature range at where it softens from a glassy to a rubbery polymer
CTE
(ppm/°C) –
Coefficient of Thermal Expansion
The dimensional response to a material upon changes in temperature
Slide13Performance and Benefits
Test methods
UV Product Range
DMA
Method - dynamic
applies
small deformation to a sample in a cyclic manner allowing the materials response to stress, temperature, frequency and other values to be determined.
TMA
Method - thermal
Applies constant
static force to a material and reports the material change as temperature or time varies to record dimensional changes.
DSC Method
Differential thermal analysis is the measurement of the difference in temperature between a sample and a reference as heat is applied to the system.
Slide14Performance and Benefits
DMA trace example
UV Product Range
Slide15Performance and Benefits
Test methods
UV Product Range
Silicones typically have a
Tg
higher than RT – flexible at RT and increased operating conditions
UV40 range
Tg
around RT (depending on test method) - will be glass-like at lower temperatures
So during thermal shock cycles UV40 spends longer ‘glass like’ per cycle than silicone based
Slide16Performance and Benefits
Thermal shock or thermal cycle?
UV Product Range
Thermal cycle = like Mil spec – slow ramp between temperature extremes.
100 cycles
Slide17Performance and Benefits
Thermal shock or thermal cycle?
UV Product Range
Thermal shock = automotive specifications – fast ramp (40-60C/min) designed to ‘shock’ materials / solder joints
FORD
spec -45 to +85C
1000cycles
Also depends on CTE mismatch between components (metals, plastics
etc
) and coating – test board also important
Slide18Performance and Benefits
Material cracking through thermal shock
UV Product Range
Cracking has been observed with UV40-250 through thermal shock testing
during customer qualifications
Humiseal set up a in-house study to investigate the causes of cracking and mitigation strategies
Slide19Performance and Benefits
Test board
UV Product Range
Slide20Performance and Benefits
Design of Experiment
UV Product Range
Selectively apply UV40 and UV40-250 to the test board and run thermal shock tests to investigate:
Thickness
Secondary curing -
Rapid cooling of assemblies after oven curing
UV
dosage
Inspect at 20-40x magnification at intervals during thermal shock
Slide21Performance and Benefits
Design of Experiment
UV Product Range
Thermal
shock info:
-65C to +
125C, 30
minute soak @ each
temperature, 5
minute transition between T1 and T2.
(~40°C/min Rate of Change)
→
Inspect at 20-40x magnification at intervals in the thermal shock
Slide22Performance and Benefits
Findings after 500cycles
UV Product Range
*UV40 and UV40-250 at 100µm
Slide23Performance and Benefits
Explanation
UV Product Range
During cure processes chemical bonds shorten in length →This causes shrinkage in coatings
On flat substrate not an issue because coating unrestrained
When applied over 3D components it creates
stresses within coating as it cures
Stress has to be relieved
Can cause cracking
Measured shrinkage of UV40 and UV40-250 at various cure conditions
UV40-250 shrinks more than UV40
Higher stress within coating
Increased tendency to crack
Slide24Performance and Benefits
Mitigation
UV Product Range
Control Coating Thickness
Avoid Accelerated Secondary Cure Process
Proper UV Cure Conditions
Thermal Shock Conditions
Higher rate of temp change increased tendency for cracks
UV40 vs. UV40-250
Less shrinkage during cure
Lower incidence of cracking
Tg
= 45
vs
25C
Slide25Performance and Benefits
Next steps – UV40 new
UV Product Range
Based on UV40 chemistry which has many excellent properties
New UV curable will have increased crack resistance –
increased flexibility,
raise the
Tg
match CTE closer to components
Formulation and testing is under way – expected earliest release date late 2012
Slide26www.humiseal.com
HumiSeal • 295 University Avenue
•Westwood • MA 02090 • USA
Tel: +1 781 8332
HumiSeal Europe • 505 Eskdale Road • Winnersh Wokingham • Berkshire • RG41 5TU • United Kingdom
Tel: +44 (0)1189 442 333