1. Part II: 접착/점착의 화학과 응용 점착제의 물성

2. 1. 점착제의 물성과 상용성
Pressure
Sensitive
Adhesives

3. Pressure Sensitive Adhesives
= Elastomer + Resin
- Acrylic based Rosins
- Silicone based Terpenes
- Block Copolymers - Synthetic Resins
- Others (C-5, C-9, and (C-5)2)
 to modify the practical performances
(tack, peel strength, and shear creep resistance )

4. Adhesives & Pressure Sensitive Adhesives
<Contact Process>
<Curing>
<Fracture Process>
Evaporation
Cooling
Reactive
Liquid
Adhesives
PSAs
Solid
Semi-Solid
Viscoelastic
materials
Semi-Solid

5. Structure of PSAs
PSA
Silicon Paper Coating
Substrate
Backing

6. 3 Performance of Pressure Sensitive Adhesives
Adhesion
Tack
Cohesion

7. The Rheological Bridge
Molecular Structure
Rheology
(Viscoelastic Properties)
Processability &
Product Performance
 MW & MWD
 Chain Branching & Cross-Linking
 Interaction of Filler With Matrix Polymer
 Single or Multi-Phase Structure
As a Function of :
 Strain Rate
 Strain Amplitude
 Temperature

8. Dynamic Analysis for Viscoelasticity by DMTA
Solids
Theromosets
Thermoplastics
Elastomers
Composites
BENDING
TORSION
TENSION
COMPRESSION

9. Dynamic Mechanical Measurements
G =
’max
 max
Elastic Modulus (Storage Modulus)
Represents How Much Energy A Materials
Stores Through Elasticity.
G =
 max
 max
Viscous Modulus (Loss Modulus)
Indicates A Material’s Ability To Dissipate
Energy - Often In the Form of Heat
tan  = G’ G
Loss Factor Compares (Damping Factor)
The Relative Importance of Viscous and
Elastic Behavior for A Material.

10. Typical Characteristics of Viscoelastic Spectrum
Increasing MW
Increasing Crystalline
104
1010
108
106
Storage Modulus (G)
Temperature (oC)
Cross-linked
Amorphous
Crystalline Tg

11. Storage Modulus and Peel Strength
for Rubber-based PSAs (with Tackfier Resin)
Temperature (℃)
Storage Modulus (G', dyne/cm2)
-40 40 80
120
160
T-0
T-1
T-2
T-3
T-4 7 8 5 6
Log G' (70℃)
Peel strength (kgf/cm)
1.0
0.1
0.01

12. Storage Modulus and Peel Strength
for Acrylic PSAs (with Tackifier Resin)
Log G' (70℃)
Peel strength (kgf/cm)
0.1 5 7 6
1.0
0.3
T-0
T-1
T-2 8 40 80
120
160
Temperature (℃)
Log G’, dyne/cm2

13. Resin Formulation and PSA Performance for Natural-based PSAs
NR (100 parts) + Terpene Resins (60 parts)
100 80 20 60 40
Ball tack (ball number) 18 12 10 8 6 4 16
Ratio (Part, %)
Ball tack
Peel strength
Holding
Power
Β-Pinene
Dipentene
Average
molecular
weight
300
400
500
600
700
800
900
1000
Peel Strength (gf/25mm)
0.7
0.6
0.5
0.4
0.3
0.2
0.1
Holding Power (mm)
1100
1200
1400
1500 14
1300
Average Molecular Weight

14. Role of Tackifier Resin Rubber based PSAs
Type
Rosin
Hydrogenated
Rosin Ester
Terpene
Terpene-Phenol
Aliphatic Hydrocarbon
Aromatic Hydrocarbon
Adhesion Tack Cohesion Miscibility Aging Resistance Price
1: 가장 좋다(가격이 싸다), 2: 좋다 (싸다), 3: 약간 나쁘다(약간 고가), 4: 나쁘다(고가)

15. Elastomer와 점착부여수지의 상용범위
SP값
8.0
8.5
9.0
Elastomer HR NR BR
SBR
아크릴계 NBR
(PP, PE)
SIS
SBS
터펜수지, C5계석유수지, 안전수첨석유수지
α-피넨수지
방향족변성터펜수지, 수첨터펜수지(방향족변성함유
C5·C9공중합계석유수지
C9계석유수지
터펜페놀수지, 로진에스테르수지
쿠마론인덴수지, 스티렌수지
EVA
점착부여수지

16. 점착부여제의 특성비교 (천연고무계점착제)
4: 가장 좋음(가장 저가) 3: 좋음 (저가) 2: 약간 나쁨(약간 고가) 1:나쁨(고가)

17. Adhesion / Cohesion Requirements of PSA products
Permanent
Labels
Packaging
Tape A D H E S I O N
Decorative
films
Removable
Labels
Protective
Films
COHESION

18. Performance of PSA and Characteristics of Resin
M.W.
Acid Value
TACK
ADHESION
COHESION
HEAT
RESISTANCE Tg

19. Cohesion (Holding Power) Shear Creep Resistance
Test of PSA Performance
Aluminum
PET(25m) V
PSA (20m)
Substrate: Aluminum
Cross Head Speed: 10-5 ~ 101 (cm/sec)
Temperature: °C for 24 h
Adhesion (Peel Strength)
T (°C)
2.5cm
Temp.: 30, 40, 50, and 70(°C)
Aluminum o
Cohesion (Holding Power)
Shear Creep Resistance
Probe Tack Test
contact time: 3 seconds
contact pressure: 100gf
temp.: (°C)
rate of separation(mm/min)
: 2.5, 5, 30, 120, and 600
 force maximum (max)
 fracture energy
(W=(1/A) Fv dt))

20. Typical Type of Phase Diagrams
UCST
LCST
1 phase
2 phases
1 phase
2 phases
LCST:
UCST:
Lower Critical Solution Temperature
Upper Critical Solution Temperature
T (°C)

21. Master Curves of Peel Strength against VaT
S. Hayashi, H. J. Kim, and H. Mizumachi, J. Adhesion Society of Japan, 31(10), 407(1995)
Master Curves of Peel Strength against VaT
for acrylic PSAs (reduced to 28°C)

22. Master Curves of Peel Strength against VaT
S. Hayashi, H. J. Kim, and H. Mizumachi, J. Adhesion Society of Japan, 31(10), 407(1995)
Master Curves of Peel Strength against VaT
for acrylic PSAs (Miscible) system

23. Master Curves of Peel Strength against VaT
S. Hayashi, H. J. Kim, and H. Mizumachi, J. Adhesion Society of Japan, 31(10), 407(1995)
Master Curves of Peel Strength against VaT
for acrylic PSAs (Immcible) system

24. H. J. Kim and H. Mizumachi, J. Adhesion, 49, 113 (1995)
Phase diagram, Tg-composition curve and
master curve of probe tack of acrylic PSAs. T E M P R A U

25. H. J. Kim and H. Mizumachi, J. Adhesion, 49, 113 (1995)
Phase diagram, Tg-composition curve and
master curve of probe tack of acrylic PSAs. T E M P R A U

26. Master curves of shear creep resistance
H. J. Kim and H. Mizumachi, J. Appl. Polym. Sci., 58, 1891 (1995)
Master curves of shear creep resistance
of acrylic PSAs miscible and immiscible systems.

27. Dynamic storage modulus and loss tangent
H. J. Kim and H. Mizumachi, J. Appl. Polym. Sci., 58, 1891 (1995)
Dynamic storage modulus and loss tangent
vs. temperature of acrylic PSAs
(miscible and immiscible).

28. Plot of storage modulus (G’) and holding time (tb)
H. J. Kim and H. Mizumachi, J. Appl. Polym. Sci., 58, 1891 (1995)
Plot of storage modulus (G’) and holding time (tb)
of acrylic PSAs

29. Schematic Representation of PSA Performance
H. J. Kim and H. Mizumachi, J. Adhesion, 49, 113 (1995)
Schematic Representation of PSA Performance
(PROBE TACK) for Miscible Blends
Increasing Tackifier
(Increasing Tg) P R O B E T A C K
Polymer
Log V
Experimental Velocity

30. Schematic Representation of PSA Performance
H. J. Kim and H. Mizumachi, J. Adhesion, 49, 113 (1995)
Schematic Representation of PSA Performance
(PROBE TACK) for Immiscible Blends
Increasing Tackiifer
(Constant Tg)
Polymer P R O B E T A C K
Log V
Experimental Velocity

31. Schematic Representation of PSA Performance
H. J. Kim and H. Mizumachi, J. Adhesion, 49, 113 (1995)
Schematic Representation of PSA Performance
(PEEL STRENGTH) for Miscible Blends P E L S T R N G H
Increasing Tackifier
(Increasing Tg)
TEMPERATURE
(Cohesive Failure)
(Adhesive Failure)
& log V

32. Schematic Representation of PSA Performance (HOLDING POWER) for Blends
H. J. Kim and H. Mizumachi, J. Adhesion, 49, 113 (1995)
Schematic Representation of PSA Performance
(HOLDING POWER) for Blends
For Miscible Blends
For Immiscible Blends
Increasing Tackiifer
(Increasing Tg)
Increasing Tackiifer
(Increasing Tg) o
(g/cm2)
aTtb(seconds)
aTtb(seconds)