high-performance materials for laminating adhesives
TRANSCRIPT
High-Performance Materials for Laminating Adhesives
Laminating Adhesives
Technology Types:
! Solventborne
! Waterborne
! Solventless (100% solids, 2K or 1K)
! Hotmelt
! UV/EB Curable
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Laminating adhesive: An adhesive layer to bond two substrates together.
Processes:
! Dry Processes
• UV Laminating Process
! Wet Processes
• EB Laminating Process
! Co-extrusion Process
UV/EB Adhesive Laminating Process
UV Adhesive Lamination: • High line speed • Low VOC
EB Adhesive Lamination: • No heat generation • Will cure through opaque films
Rewind Secondary Unwind Station Primary Unwind
Station Coater
Electron Beam
UV Lamp
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Markets and Applications
Food Packaging and Consumer Goods
Photovoltaic
Medical Automobile
Electronics
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Performance Requirements
General Applications:
! Initial bond strength
! Ultimate bond strength
! Resistance to service environment (heat, humidity, electric)
Special Applications:
! High optical clarity
! Electrical insulation (low dielectric constant, high breakdown voltage)
! Gas permeability (moisture, oxygen, etc.)
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Scope of this Study
! Typical Formulation of UV/EB Curable
Laminating Adhesives
Components Level
Oligomers 40% to 70%
Monomers 70% to 30%
Photoinitiators 1% to 3%
! New Oligomer Development
Products Type of Oligomers Viscosity at
60°C, cps Color
CN9018 Polyether UA 20,000 <100 APHA
CN966J75 Polyester UA 4500 <100 APHA
PRO12184 Polyester UA, High molecular weight
16,000 <100 APHA
PRO12507 Tin-free polyester UA 15,500 <100 APHA
NTX12321 Allophonate 41,000 <120 APHA
NTX11945 Bio-based UA 12,000 <120 APHA
NTX12514 Moisture-resistant polyester UA
5600 <150 APHA
NTX12427 Polyvinyl Acetal 25,000 <150 APHA
NTX12585 Polycaprolactone UA 22,800 <120APHA
PRO12384 Polycarbonate UA 26,000 <100 APHA
PRO12546 Polycarbonate UA 22,500 <100 APHA
PRO12599 Polycarbonate UA, High molecular weight
80,400 <100 APHA
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Physical Properties
Products Tensile Strength (PSI) Elongation Tg, by Tan
Delta CN966J75
430 238 31 NTX12321
122 260 -21 NTX11945
668 165 -19 NTX12514
111 103 -16 NTX12427-29B -4 1527 24
NTX12585 314 157 -16
PRO12384 952 289 -6
PRO12546 755 360 -12
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Key Performance Evaluated
! Sample Preparation ● Each oligomer was formulated using Sartomer’s standard adhesive formulation
package. ● The adhesives were laminated between DuPont (XST-6578) PET films. ● Curing condition: Under a Fusion 600 W/in D lamp at a speed of 15 fpm. ● Thickness of each adhesive sample: Tested to be approximately 9 mils.
! Application Property Test • Initial bond strength: Instron • Initial optical clarity: UV/Vis spectra • Ultimate bond strength and optical clarity under different weathering conditions:
• ASTM D4329-05 cycle B QUV • 85°C/85% relative humidity • Freeze-thaw cycles (each cycle includes 20 hours at 85°C/85% relative
humidity and 2 hours at -40°C) • The weathering samples were equilibrated at RT/50% relative humidity
environment for seven days before T-peel testing.
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Initial Optical Clarity
All the adhesives are optically clear 9
Optical Clarity After 500 Hours QUV Weathering
All the materials kept optical clarity 10
Optical Clarity After 500 Hours 85°/85% Relative Humidity Weathering
High molecular weight polyester and polycarbonate urethane acrylates began to lose optical clarity.
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Optical Clarity After 500 Hours Freeze-Thaw Cycles
Polyester urethane acrylates CN966J75, PRO12184, PRO12507 and polycarbonate urethane acrylate NTX12599 lost optical clarity.
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Change in Bond Strength After 500 Hours Weathering
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! Polyester, polycaprolactone and polycarbonate urethane acrylates demonstrate high initial bond strength. Polyether urethane acrylate shows weak initial bond strength.
! Most polyester, polycaprolactone urethane acrylates lost bond strength. Polyether urethane acrylates can hold bond strength.
Change in Bond Strength After 500 Hours Weathering
! NTX12514 (Polyester UA) and PRO12546 (Polycarbonate UA) still exhibit high bond strength after all three weathering tests.
Change in Bond Strength After 2000 Hours Weathering
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Optical Clarity After 2000 Hours QUV
! CN9018, polyether urethane acrylate lost optical clarity after 2000 hours QUV.
! Only five products kept optical clarity after 1000 hours weathering.
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Optical Clarity After 2000 Hours Freeze-Thaw Cycles
! All five products survived 2000 hour 85°C/85% R.H. and freeze-thaw weathering
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Feature Products- Change in Bond Strength With Aging Time
! PRO12546-Polycarbonate urethane acrylate
! NTX12514-Polyester urethane acrylate
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Conclusions
! Polyester urethane acrylates can be designed to have superior durability even under harsh weathering conditions.
! Not all the polycarbonate urethane acrylates can deliver high durability. Specific composition and molecular weight do matter.
! NTX12514 and PRO12546 are featured products for laminating adhesive applications requiring:
● Strong initial bond strength
● High optical clarity
● Maintenance of high optical clarity and bond strength under different weathering environments
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For more information:
www.sartomer.com
(800) SARTOMER
(610) 363-4100
@SartomerGlobal on Twitter
Thank you
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