4/10/2014
Today’s Webinar will begin at 6:30 PM (EST)
The webinar will be begin shortly.
All webinars in the series are archived at
http://www.esf.edu/outreach/uvebwebinar
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Radiation Curing Program [RCP]
SUNY-ESF is offering three online courses in Radiation Curing every fall, spring, and summer term.
•Introduction to Polymer Coatings / Dr. Molly Hladik
•Radiation Curing of Polymer Technologies / Dr. Susan Bailey
•Radiation Curing Equipment, Instrumentation and Safety / Dr. Mark Driscoll, Mr. Dan Montoney
Available as non-credit, graduate credit, and as an Advanced Certificate in Radiation Curing from SUNY.
•NEW short-course Summer 2014: Principles of Energy Curing Technologies / Dr. Mike Idacavage
•
Available currently as non-credit, professional development only.
For more information and to sign up, visit www.esf.edu/outreach/radcuring
May 12‐14, 2014
Chicago, IL
Visit the Radiation
Curing Program
Staff at Booth 119!
Learn More at:
www.RadTech2014.com
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UV Curing Technology
A Route to Solvent-free Adhesives and Coatings
Stephen Cantor, Ph.D.
Chemistry & Technology
• What is Radiation Curing?
• Chemistry‐Photoinitiators, Monomers & Oligomers
• Adhesive Formulation(s)
• Advantages
• Fluorescent Response for In‐line Inspection
• Markets
• YouTube Short
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Electromagnetic Spectrum
Ultraviolet Light
UVC
200 nm
X‐rays
10-5 nm
UVV
1 nm
UVA
UVB
280
V I S I B L E L I G H T
315
400
600
Infrared
760
Microwaves
1 mm
Radiowaves
1m
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Spectral Distribution of UV/Vis
Metal Halide Bulb
Relative intensity
30
25
20
15
10
5
0
200
250
300
350
400
450
Wavelength, nm
How Do Light Curable Adhesives Work?
• Light Curable Adhesives crosslink using energy provided by ultraviolet (UV) and/or visible light
• It is critical that the light source outputs enough energy of the proper wavelength(s) to cure the adhesive
• Curing starts when the adhesive is exposed to energy of the proper wavelength(s) and it will stop if light is turned off or removed from the cure area
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Absorption Curve of Photoinitiators
Relative intensity
30
25
20
15
10
5
0
200
250
300
350
400
450
Wavelength, nm
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Why UV/Visible Light Cure
Most common answer is speed, but also…
One-part systems-no mixing, purging, waste
Solvent-free systems
In-line inspection
Performance
Building Blocks for UV Curing • Liquid Monomers: Monoacrylates; Diacrylates; Polyacrylates
• Urethane‐acrylate oligomers
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ACRYLIC ACID
2‐Hydroxyethylmethacrylate
(HEMA)
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Isobornyl Methacrylate
I
TETRAHYDROFURFURYl ACRYLATE (THFA) O
CH
2
= C - C - O - CH
O
2
H
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Viscosity of Water= 1mPa.S at RT
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Oligomer Preparation
Structure and Mol. Weight Determines Properties of the Final Product
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Typical Light Curable urethane acrylate adhesive
UV/VIS
light
P.I.
Photoinitiator
ADDITIVE for fine tuning
MONOMER for specific properties
OLIGOMER for basic properties
Typical Adhesive Formulation
INGREDIENTS
Oligomer
HEMA
IBOA
Acrylic Acid
THFA
EGDMA
Thickeners
Stabilizers
Photoinitiators
Adhesion Promoters
PERCENT
43.0
6.0
22.0
5.0
10.0
3.0
4.0
2.5
3.0
1.5
*Viscosity will depend on the amount of thickener used
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Markets Served
Medical
Industrial
Electronics
Core
Markets
Automotive
Optical
Electrical Assembly
Packaging
Aerospace
Inspection and Quality Control
COLOR CHANGE UPON UV EXPOSURE
FLUORESCENT RESPONSE VIA OPTICAL READER
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Fluorescing Agent Spectra
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Relative intensity
30
25
20
15
10
5
0
200
250
300
350
400
450
Wavelength, nm
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Visible light from the UV Blub
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Optical Reader to Measure Fluorescent Response
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Profile of anesthesia mask
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Sidney Hutter
Kylix Cubic Heart Vase
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Acknowledgments
Sartomer‐Henry Miller BASF‐Eugene Sitzmann
Dymax ‐ Staff
Ellsworth‐Jeff Payne 23
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